CN1282867C - Capacitance type electronic price computing scale - Google Patents
Capacitance type electronic price computing scale Download PDFInfo
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- CN1282867C CN1282867C CN 200410067563 CN200410067563A CN1282867C CN 1282867 C CN1282867 C CN 1282867C CN 200410067563 CN200410067563 CN 200410067563 CN 200410067563 A CN200410067563 A CN 200410067563A CN 1282867 C CN1282867 C CN 1282867C
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Abstract
The present invention relates to a capacitance type electronic price computing scale which belongs to the technical field of metering. An RC annular oscillator is composed of a six-input phase inverters, an external resistor, a sensor capacitor Cs, a high-frequency decoupling capacitor C1 and a high-frequency decoupling capacitor C2. In a temperature compensation device, a six-input phase inverter U2 is adopted and connected into a form of an annular oscillator. One terminal of a thermal resistor RT is connect with an output port of a phase inverter U2F, and the other terminal is connected with an input terminal of a fixed capacitor C4 and an input terminal of a phase inverter U2A; the other terminal of the fixed capacitor C4 is connected with an input terminal 13 of the phase inverter U2F, and the rest three phase inverters U2B, U2C and U2E are mutually connected in series. One terminal of a high-frequency decoupling capacitor C3 and one terminal of a high-frequency decoupling capacitor C5 are connected with the input terminal of the phase inverter U2A and the input terminal of the phase inverter U2F, and the other terminal of the high-frequency decoupling capacitor C3 and the other terminal of the high-frequency decoupling capacitor C5 are jointly grounded. An output terminal 8 of a buffer U2D is directly connected with a computer. A fine adjustment device for capacitor clearance is a J-shaped rod member fixed to a capacitance type sensor. A sealing device of an elastic membrane comprises a cover plate, an elastomer membrane and a cushion block, wherein a central plane membrane of the elastomer membrane is fixed to the capacitance type sensor by the cushion block; an outer ring of the elastomer membrane and the cover plate are fixed together.
Description
Technical field
What the present invention relates to is a kind of electronic scales of field of measuring techniques, specifically is a kind of capacity-type electronic scale.
Background technology
Existing electronic scales, no matter domestic, external, nearly all be with the sensitive element of strain gauge transducer as electronic scales.The not only complex process of sensor, and output signal itself is very faint, and subsequent conditioning circuit must have preposition amplification, and mould/number conversion link could be connected with computing machine, so the production cost of whole electronic scales is very high naturally.
Find by prior art documents, the patent No. is: 91228789.6, the utility model name is called: portable pocket-size electronic scale, this patent readme is: adopt a kind of capacitance weighing sensor, this sensor is by an elastic bellows, on being nested with one heart, following two metal sleeves constitute with the steelyard hook that is positioned at two sleeve pipe circle centre positions, it is overlapping many more that goods on the steelyard hook weighs two metal sleeves more, capacitance is big more, otherwise capacitance is more little, and the weighing-up wave of sensor output is through after the signal Processing, be admitted to the A/D converter conversion, A/D converter output seven segment code signal is sent into display and is shown, this electronic scales simple in structure, and cost is low.But this patent can only be used for steelyard, thereby can not solve position error, even adjust the position error of electronic scales, always adjusts with repairing the pincers elastomer method.All adopt analog-and digital-hybrid circuit on the circuit simultaneously, not only cost height and debug difficulties.
Summary of the invention
The objective of the invention is to overcome deficiency of the prior art, a kind of capacity-type electronic scale is provided, make it can simplify the production technology of electronic scale sensor, make subsequent conditioning circuit become very simple, as long as good frequency meter, turn rib-loop and just can solve position error, very easy, precision is improved.
The present invention is achieved by the following technical solutions, the present invention includes: RC annular oscillator, capacitance type sensor, temperature compensation means, capacitance gap micromatic setting, flexible sheet packoff.
RC annular oscillator converts the power variation of sensor to the electric signal frequency.When sensor is subjected to temperature variation, compensate consequent error and custom-designed temperature-compensation circuit.RC annular oscillator is the power variation with sensor, converts the change-over circuit of frequency change to, has greatly simplified the metering circuit of sensor.
RC annular oscillator comprises: hex inverter, outer meeting resistance, sensor capacitance Cs, two high frequency decoupling capacitor C1, C2.Phase inverter U1A, U1B, U1C, U1D, U1E and R1, Cs be the looping oscillator together.The capacitor C s size of capacitive transducer reduces with the increase of load.High frequency decoupling capacitor C1, the end of C2 respectively with phase inverter U1A, the input end of U1B links to each other, other end ground connection.High frequency decoupling capacitor C1, C2, the antijamming capability of increase capacitive transducer.Outer meeting resistance R1 and sensor capacitance Cs constitute oscillating circuit together.The value that changes R1 can become the vibration frequency that rises of oscillator.So that allow working sensor in optimum Working.The output terminal of phase inverter U1F is the frequency output of oscillator.U1F makes impact damper and uses.Sort circuit is because distributed capacitance is little, and the amplitude of oscillator and frequency are all more stable, and frequency output can directly be connected with computing machine.
Because elastomeric Xiang Shi modulus also changes during temperature variation thereupon.For reducing this error, must compensate.The present invention directly measures temperature at any time, and compensates according to the temperature coefficient of Xiang Shi modulus.Not only simply but also accurate.Temperature compensation means adopts a slice hex inverter U2, is connected into annular oscillator form equally.Thermistor RT one terminates at the output port of phase inverter U2F, and the other end links to each other with the input end of phase inverter U2A with permanent circuit C4.The input end 13 of the other end of fixed capacity C4 and phase inverter U2F is connected, and forms feedback capacity.Its excess-three phase inverter U2B, U2C, U2E connects each other, increases the driving function of C4 output feedback.High frequency decoupling capacitor C3, C5 one termination phase inverter U2A, U2F input end, other end common ground.The output terminal of impact damper U2D is the frequency F2 of temperature variation, and F2 is directly linked computing machine, just can know the state of temperature of sensor at any time, and in time carries out fine compensation.
Capacitance type sensor comprises: upper bracket, lower carriage, following sheet plate, upper and lower two insulation spacers, two plate electrode plates, sensor elastomer, spring, upper bearing plate, regulate support plate, cover plate, its annexation is: the bottom crown of two plate electrode plates, also get final product movable plate electrode, be fixed on down on the sheet plate by upper and lower two insulation spacers.Prop up the sheet plate down and be fixed on the movable end of sensor elastomer with screw thread.The top crown of two plate electrode plates is fixed in the adjusting support plate by insulation spacer.An end of regulating support plate is fixed on the upper bearing plate with screw thread.Same upper bearing plate is fixed in the stiff end of sensor elastomer by screw thread.The other end of regulating support plate is connected with the other end of upper bearing plate by spring.Regulate screw thread the distance of an end between upper bearing plate and the adjusting support plate is changed, thereby make the distance between the battery lead plate that monolateral variation take place.Can adjust the position error of electronic scales easily.This method was adjusted the method for position error more than repair the pincers elastic body by rule of thumb in the past, came more intuitively, and was convenient, quick.Because the sensor elastomer left end is fixed on the lower carriage (also can be described as heelpiece) with screw thread.No matter whether sensor is stressed, its position is indeclinable, so this end is called stiff end again.The right-hand member and the upper bracket of sensor elastomer are fixed together, and in fact support and bearing tray connect together.When being changed when weighing on the pallet, the sensor elastomer right end position can go up, and moves down.So this end claims movable end again, thereby drive gap between the battery lead plate, promptly change electric capacity Cs.Reach the purpose of judging tested weight according to frequency F1.
The capacitance gap micromatic setting is actually the rod member of a U-shaped, and the galianconism of U-shaped is fixed on the upper bearing plate with screw thread, and the long-armed upper end of U-shaped links to each other with upper bearing plate with spring with regulating screw thread, and U-shaped is long-armed near fixing fixed plate electrode in the end.Turn the adjusting screw thread the long-armed of U-shaped rod member rotated around end face, thereby make the end face of fixed plate electrode, be i.e. elastic bearing point rotation around the U-shaped rod member.Thereby reach the monolateral subtle change in battery lead plate gap, can regulate the position error of electronic scales easily.
In order to keep the dielectric constant between the capacitive transducer pole plate stable, extraneous dust is entered between the pole plate, it is important that sealing causes the pass.Flexible sheet packoff of the present invention adopts the elastic body diaphragm, seal, the central plane film of elastic body diaphragm passes through cushion block, be fixed together with the movable end of sensor elastomer, the outer shroud and the cover plate of elastic body diaphragm are fixed together, and cover plate and lower carriage are fixing, so the outer shroud of elastic body diaphragm fixes, and the center of diaphragm is movable.Be made up of a plurality of ripples for the elastic body diaphragm, so the motion of sensor movable end, only the rigidity to sensor has faint influence, and does not influence the hysteresis of sensor, creep, and linearities etc. promptly do not influence the original precision of sensor yet.
The present invention forms electronic scales by becoming the clearance-type capacitive transducer, equally also can form pantry scale, electronic platform scale etc.Circuit adopts annular oscillator, and its output letter can directly link to each other with calculating.Not only circuit is simple, and the linearity of sensor is good.Adopt the gap micromatic setting on the structure, can accurately and easily adjust the position error of electronic scales.Also have the diaphragm type packoff simultaneously, greatly improved the long-time stability of electronic scales.At present the output value surpasses 100,000,000 yuan to the domestic production electronic price computing scale more than 500,000 every year, uses condenser type of the present invention to valuate behind the scale, and its production cost can reduce by 20% at least, and then its economic benefit is about about 20,000,000 yuan.After the more important thing is the employing capacitance type sensor, its precision will have bigger raising than the electronic scales of original strain gauge transducer, even can form electronic balance.After capacitance weighing sensor is used, will make script at metallurgy, the high temperature side force transducer that runs in the space flight becomes very easy.
Description of drawings
Fig. 1 RC annular of the present invention oscillator circuit diagram
Fig. 2 capacitive sensor structure synoptic diagram of the present invention
Embodiment
As shown in the figure, the present invention includes: RC annular oscillator 1, capacitance type sensor 2, temperature compensation means 3, capacitance gap micromatic setting 4, flexible sheet packoff 5, as Fig. 1, shown in 2.
As shown in Figure 1, RC annular oscillator 1 comprises: hex inverter, external, resistance, sensor capacitance Cs, two high frequency decoupling capacitor C1, C2.Phase inverter U1A, U1B, U1C, U1D, U1E and R1, Cs be the looping oscillator together, high frequency decoupling capacitor C1, the end of C2 respectively with phase inverter U1A, the input end of U1B links to each other, other end ground connection, high frequency decoupling capacitor C1, C2, outer meeting resistance R1 and sensor capacitance Cs constitute oscillating circuit together, the output terminal 12 of phase inverter U1F is the frequency output of oscillator, and frequency output directly is connected with computing machine.
Temperature compensation means 3 adopts a slice hex inverter U2, be connected into annular oscillator form equally, thermistor RT one terminates at the output port of phase inverter U2F, the other end links to each other with the input end of phase inverter U2A with permanent circuit C4, the input end 13 of the other end of fixed capacity C4 and phase inverter U2F is connected, form feedback capacity, its excess-three phase inverter U2B, U2C, U2A connects each other, high frequency decoupling capacitor C3, C5 one termination phase inverter U2A, the U2F input end, other end common ground, the frequency F2 that output terminal 8 representation temperatures of impact damper U2D change, F2 directly links computing machine.
As shown in Figure 2, capacitance type sensor 2 comprises: sensor elastomer 6, and spring 7, upper bearing plate 8 is regulated support plate 9, upper bracket 13, lower carriage 14, following sheet plate 15, upper and lower two insulation spacers, 16,17, two plate electrode plates 18.Its annexation is: the bottom crown of two plate electrode plates 18, also get final product movable plate electrode, by last, following two insulation spacers 16,17 are fixed on down on the sheet plate 15, prop up sheet plate 15 usefulness screw threads down and be fixed on the movable end of sensor elastomer 6, the top crown of two plate electrode plates 18, be fixed in adjusting support plate 9 by insulation spacer, an end of regulating support plate 9 is fixed on the upper bearing plate 8 with screw thread, same upper bearing plate 8 is fixed in the stiff end of sensor elastomer 6 by screw thread, regulate the other end of support plate 9, be connected by the other end of spring 7 with upper bearing plate 8, regulate screw thread the distance of an end between upper bearing plate 8 and the adjusting support plate 9 is changed, thereby make the distance between the battery lead plate 5 that monolateral variation take place.Sensor elastomer 6 left ends are fixed on the lower carriage 14 with screw thread, and this end is called stiff end, and the right-hand member of sensor elastomer 6 and upper bracket 13 are fixed together, and this end claims movable end.
Capacitance gap micromatic setting 4 is rod members of a U-shaped, the galianconism of U-shaped is fixed on the upper bearing plate 8 with screw thread, the long-armed upper end of U-shaped links to each other with upper bearing plate 8 with spring 7 with regulating screw thread, U-shaped is long-armed near fixing fixed plate electrode 18 in the end, turning the adjusting screw thread makes the long-armed of U-shaped rod member rotate around end face, make the end face of fixed plate electrode 18, i.e. elastic bearing point rotation around the U-shaped rod member.
Flexible sheet packoff 5 comprises: cover plate 10, elastic body diaphragm 11, cushion block 12, the central plane film of elastic body diaphragm 11 is fixed together by the movable end of cushion block 12 with sensor elastomer 6, the outer shroud of elastic body diaphragm 11 and cover plate 10 are fixed together, and cover plate 10 is fixing with lower carriage 14, therefore the outer shroud of elastic body diaphragm 11 is fixed, and the center of diaphragm is movable.Elastic body diaphragm 11 is made up of a plurality of ripples.
Claims (7)
1, a kind of capacity-type electronic scale, comprise: capacitance type sensor (2), it is characterized in that, also comprise: RC annular oscillator (1), temperature compensation means (3), capacitance gap micromatic setting (4), flexible sheet packoff (5), capacitance type sensor (2) right-hand member side and RC annular oscillator (1) and temperature compensation means (3) are fixing, capacitance gap micromatic setting (4) is fixed on the capacitance type sensor (2), flexible sheet packoff (5) is fixed together with capacitance type sensor (2), wherein:
RC annular oscillator (1) comprising: a hex inverter, outer meeting resistance, sensor capacitance Cs, high frequency decoupling capacitor C1, C2, phase inverter U1A, U1B, U1C, U1D, U1E and R1, Cs is the looping oscillator together, high frequency decoupling capacitor C1, C2, outer meeting resistance R1 and sensor capacitance Cs constitute oscillating circuit together, and the output terminal 12 of phase inverter U1F directly is connected with computing machine;
Temperature compensation means (3) adopts a slice hex inverter U2, be connected into annular oscillator form equally, thermistor RT one terminates at the output port of phase inverter U2F, the other end links to each other with the input end of phase inverter U2A with permanent circuit C4, the input end 13 of the other end of fixed capacity C4 and phase inverter U2F is connected, form feedback capacity, its excess-three phase inverter U2B, U2C, U2E connects each other, high frequency decoupling capacitor C3, C5 one termination phase inverter U2A, U2F input end, other end common ground, the output terminal 8 of impact damper U2D is directly linked computing machine;
Capacitance gap micromatic setting (4) is the rod member of a U-shaped, and the galianconism of U-shaped is fixed on the capacitance type sensor (2), and the long-armed upper end of U-shaped links to each other with capacitance type sensor (2), and U-shaped is long-armed also to be fixed on capacitance type sensor (2) near the end;
Flexible sheet packoff (5) comprising: cover plate (10), elastic body diaphragm (11), cushion block (12), the central plane film of elastic body diaphragm (11) is fixed together by cushion block (12) and capacitance type sensor (2), and the outer shroud of elastic body diaphragm (11) and cover plate (10) are fixed together.
2, capacity-type electronic scale according to claim 1, it is characterized in that, described capacitance type sensor (2) comprising: sensor elastomer (6), spring (7), upper bearing plate (8), regulate support plate (9), upper bracket (13), lower carriage (14), under prop up sheet plate (15), on, following two insulation spacers (16,17), two plate electrode plates (18), sensor elastomer (6) left end is fixed on the lower carriage (14), this end is called stiff end, the right-hand member of sensor elastomer (6) and upper bracket (13) are fixed together, this end is a movable end, the bottom crown of two plate electrode plates (18) is by last, following two insulation spacers (16,17) be fixed on down on the sheet plate (15), under prop up sheet plate (15), one end of upper bearing plate (8) is fixed on the sensor elastomer (6), the top crown of two plate electrode plates (18) is fixed in regulates support plate (9), an end of regulating support plate (9) is fixed on the upper bearing plate (8), and the other end of regulating support plate (9) is connected with the other end of upper bearing plate (8) by spring (7).
3, capacity-type electronic scale according to claim 2, it is characterized in that, prop up sheet plate (15) down and be fixed on the movable end of sensor elastomer (6), upper bearing plate (8) is fixed in the stiff end of sensor elastomer (6), and the top crown of two plate electrode plates (18) is fixed in by insulation spacer regulates support plate (9).
According to claim 1 or 2 described capacity-type electronic scales, it is characterized in that 4, the galianconism of U-shaped is fixed on the upper bearing plate (8), the long-armed upper end of U-shaped links to each other with upper bearing plate (8) with spring (7), and U-shaped is long-armed near fixing battery lead plate (18) in the end.
5, according to claim 1 or 2 described capacity-type electronic scales, it is characterized in that, the central plane film of elastic body diaphragm (11) is fixed together by the movable end of cushion block (12) with sensor elastomer (6), cover plate (10) is fixing with lower carriage (14), the outer shroud of elastic body diaphragm (11) is fixed, and the center of elastic body diaphragm (11) is movable.
6, capacity-type electronic scale according to claim 1 is characterized in that, high frequency decoupling capacitor C1, the end of C2 respectively with phase inverter U1A, the input end of U1B links to each other, other end ground connection.
7, according to claim 1 or 2 described capacity-type electronic scales, it is characterized in that elastic body diaphragm (11) is made up of a plurality of ripples.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410067563 CN1282867C (en) | 2004-10-28 | 2004-10-28 | Capacitance type electronic price computing scale |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410067563 CN1282867C (en) | 2004-10-28 | 2004-10-28 | Capacitance type electronic price computing scale |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1603763A CN1603763A (en) | 2005-04-06 |
| CN1282867C true CN1282867C (en) | 2006-11-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410067563 Expired - Fee Related CN1282867C (en) | 2004-10-28 | 2004-10-28 | Capacitance type electronic price computing scale |
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|---|---|
| CN (1) | CN1282867C (en) |
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| CN1603763A (en) | 2005-04-06 |
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Granted publication date: 20061101 Termination date: 20111028 |