CN214843527U - Novel resistance strain type digital weighing sensor based on temperature compensation - Google Patents
Novel resistance strain type digital weighing sensor based on temperature compensation Download PDFInfo
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- CN214843527U CN214843527U CN202120586999.8U CN202120586999U CN214843527U CN 214843527 U CN214843527 U CN 214843527U CN 202120586999 U CN202120586999 U CN 202120586999U CN 214843527 U CN214843527 U CN 214843527U
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Abstract
The utility model discloses a novel resistance strain formula digital weighing sensor based on temperature compensation, including sensor housing, first resistance foil gage, temperature compensation piece and second resistance foil gage, first resistance foil gage is installed in one side embedding of sensor housing top face, the second resistance foil gage is installed in the opposite side embedding of sensor housing top face, temperature compensation piece is installed in the middle embedding of sensor housing top face. The utility model has the advantages of regard as resistance strain digital weighing sensor temperature compensation with most direct, the truest mode, let resistance strain digital weighing sensor temperature compensation effect accomplish better, the accurate service temperature range that measurations enlarges, temperature performance after the temperature compensation is the uniformity good specially.
Description
Technical Field
The utility model relates to a weighing sensor technical field specifically is a novel resistance strain type digital weighing sensor based on temperature compensation.
Background
A load cell is essentially a device that converts a mass signal into a measurable electrical signal output. The sensor is used in consideration of the actual working environment of the sensor, which is important for correctly selecting the weighing sensor, and the sensor is related to whether the sensor can work normally, the safety and the service life of the sensor, and even the reliability and the safety of the whole weighing apparatus. On the basis of basic concepts and evaluation methods of main technical indexes of the weighing sensor, the new national standard and the old national standard have qualitative differences.
At present, the temperature compensation of the digital weighing sensor at home and abroad is basically completed by adding hardware temperature compensation by the sensor, and some temperature compensation aims at achieving temperature compensation by using a thermistor on a PCB or a temperature module in a chip. The temperature compensation is achieved by adding hardware by using the sensor: 1. the cost of adding the temperature compensation sheet is high. 2. The temperature characteristic is not linear change after the temperature compensation of the hardware. 3. The temperature compensation accuracy is not high. Temperature compensation is achieved by using a chip internal temperature module: 1. the real-time temperature of the elastomer and the strain gauge cannot be directly measured and sensed. 2. The compensation effect is not good when the temperature of the needle sensor can not be directly measured. 3. The temperature compensation accuracy is not high.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a novel resistance strain formula digital weighing sensor based on temperature compensation possesses as resistance strain formula digital weighing sensor temperature compensation with most direct, the truest mode, lets resistance strain formula digital weighing sensor temperature compensation effect accomplish better, and the accurate service temperature range that measurations enlarges, and the temperature performance after the temperature compensation is the advantage that the uniformity is good specially, has solved and has utilized sensor itself to increase hardware and reach temperature compensation: 1. the cost of adding the temperature compensation sheet is high. 2. The temperature characteristic is not linear change after the temperature compensation of the hardware. 3. The temperature compensation accuracy is not high. Temperature compensation is achieved by using a chip internal temperature module: 1. the real-time temperature of the elastomer and the strain gauge cannot be directly measured and sensed. 2. The compensation effect is not good when the temperature of the needle sensor can not be directly measured. 3. The temperature compensation precision is not high.
In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a novel resistance strain formula digital weighing sensor based on temperature compensation, includes sensor housing, first resistance foil gage, temperature compensation piece and second resistance foil gage, first resistance foil gage is installed in the embedding of one side of sensor housing top face, the second resistance foil gage is installed in the opposite side embedding of sensor housing top face, temperature compensation piece is installed in the middle embedding of sensor housing top face.
Preferably, the first resistance strain gauge and the second resistance strain gauge are symmetrically distributed on a central axis of the top end of the sensor shell.
Preferably, an embedded groove matched with the first resistance strain gauge and the second resistance strain gauge is formed in the top end face of the sensor shell respectively, the first resistance strain gauge and the second resistance strain gauge are installed in the embedded groove respectively, a recoverable elastomer structure processed by an aluminum metal material is installed in the embedded groove in the sensor shell, the first resistance strain gauge and the second resistance strain gauge are contacted with the recoverable elastomer structure respectively to form a resistance bridge circuit, a recoverable elastomer structure processed by the aluminum metal material is arranged at the position, on the top end face of the sensor shell, where the temperature compensation sheet is embedded, and the temperature compensation sheet is contacted with the recoverable elastomer structure processed by the aluminum metal material.
Preferably, a sensor PCBA is embedded in one side of the front face of the sensor shell and electrically connected with a circuit board arranged in the sensor shell.
Preferably, the sensor housing is provided with a dedicated chip therein, and the dedicated chip is electrically connected to a circuit board provided in the sensor housing.
Preferably, the temperature compensation sheet is made of manganese copper wire and constantan wire high-temperature coefficient materials.
Compared with the prior art, the beneficial effects of the utility model are as follows: the manganese copper wire or constantan wire is used as a high-temperature coefficient material of the temperature compensation sheet to be tightly attached to the elastomer arranged in the sensor shell, so that the temperature of the sensor can be directly tested. Since the direct temperature of the direct contact elastomer can be further temperature compensated simultaneously. Because the phenomenon of over-compensation or under-compensation does not exist when the temperature compensation is carried out synchronously.
By using the temperature-measuring independent resistance wire (by using the manganese copper wire or the constantan wire as the high-temperature coefficient material of the temperature compensation sheet), the phenomenon of inaccurate output or error caused by the characteristics of the original sensor circuit can be avoided.
The temperature compensation can be effectively carried out by using software due to the characteristic that the temperature characteristic is close to linearity without adding other temperature circuits in the bridge circuit.
The temperature error characteristic after bridge combination is close to a straight line, and the temperature can be easily compensated through software.
The linearity of the sensor can be well optimized except for temperature compensation by using software.
Drawings
Fig. 1 is a schematic view of the structure of the present invention;
fig. 2 is a temperature error and compensation equivalent circuit of the piezoresistive sensor of the present invention;
FIG. 3 is a graph showing the relationship between the temperature error and the 20 degree ratio of the present invention;
FIG. 4 is a block diagram of a sensor-dedicated chip according to the present invention;
fig. 5 is a block diagram of the sensor of the present invention.
In the figure: 1. a sensor housing; 2. a sensor PCBA; 3. a first resistive strain gauge; 4. a temperature compensation sheet; 5. a second resistive strain gauge.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element to which the reference is made must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, and for example, "connected" may be either fixedly connected or detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
Referring to fig. 1 to 5, the present invention provides an embodiment: the utility model provides a novel resistance strain formula digital weighing sensor based on temperature compensation, includes sensor housing 1, first resistance foil gage 3, temperature compensation piece 4 and second resistance foil gage 5, and first resistance foil gage 3 is installed in the embedding of one side of sensor housing 1 top face, and second resistance foil gage 5 is installed in the opposite side embedding of sensor housing 1 top face, and first resistance foil gage 3 and second resistance foil gage 5 are with the axis symmetric distribution on sensor housing 1 top. The top end face of the sensor shell 1 is provided with embedded grooves matched with the first resistance strain gauge 3 and the second resistance strain gauge 5 respectively, the first resistance strain gauge 3 and the second resistance strain gauge 5 are installed in the embedded grooves respectively, a recoverable elastomer structure processed by aluminum metal materials is installed in the embedded grooves in the sensor shell 1, and the first resistance strain gauge 3 and the second resistance strain gauge 5 are in contact with the recoverable elastomer structure respectively to form a resistance bridge circuit.
The middle of the top end face of the sensor shell 1 is embedded with a temperature compensation sheet 4, and the temperature compensation sheet 4 is made of manganese copper wires and constantan copper wires which are made of high-temperature coefficient materials. The position of the temperature compensation sheet 4 embedded in the top end surface of the sensor shell 1 is provided with a recoverable elastomer structure processed by aluminum metal, and the temperature compensation sheet 4 is in contact with the recoverable elastomer structure processed by the aluminum metal.
The sensor PCBA2 is embedded and installed on one side of the front face of the sensor shell 1, and the sensor PCBA2 is electrically connected with a circuit board arranged in the sensor shell 1. The sensor shell 1 is internally provided with a special chip which is electrically connected with a circuit board which is internally arranged in the sensor shell 1.
When the sensor shell 1 is stressed, after the elastic body is deformed, the first resistance strain gauge 3 and the second resistance strain gauge 5 attached to the elastic body generate resistance value changes, so that a resistance bridge circuit is unbalanced, and then signal quantity changes are generated.
The resistance bridge signal change is utilized to obtain digital signal feedback and an elastomer weighing output signal A through a differential input analog-to-digital conversion ADC chip module.
A temperature compensation sheet 4 is fixed on an elastic body, the temperature-measured temperature compensation sheet 4 and other resistors form a bridge circuit, and digital signal feedback and an elastic body temperature output signal B are obtained through a difference input analog-to-digital conversion ADC chip module by utilizing the bridge signal change of the resistors.
The digital signals A and B are obtained and are filtered to obtain a stable value.
The values of A and B are obtained at different temperature points, and the temperature compensation curve is deduced by using the relationship at different temperatures, so as to achieve the purpose of temperature compensation.
Integrating the differential input analog-to-digital conversion ADC, the MCU, the RS232, the PWM and the DAC into a chip; thereby greatly reducing the cost and the module size, and being embedded in the digital sensor shell 1.
Example 2
The utility model provides a pair of embodiment: a novel resistance strain type digital weighing sensor based on temperature compensation, the principle of the resistance strain type weighing sensor is as follows:
the first resistance strain gage 3 and the second resistance strain gage 5 can convert the change of strain into the change of resistance, and in order to display and record the magnitude of strain, the change of resistance is further converted into the change of voltage or current, and the conversion is generally realized by adopting a bridge circuit. The bridge is divided into a dc bridge and an ac bridge according to the power supply.
The following description of the dc bridge:
the dc bridge means that the bridge voltage is supplied by dc.
By the principle of voltage divider, the load current is
When IL is equal to 0, the bridge is balanced, the output voltage UO is equal to 0, the bridge is balanced under the conditions of R1/R2, R3/R4, R1 is an operating strain gauge, the strain changes the resistance value thereof by Δ R1, R2, R3, and R4 are fixed resistors, and RL is equal to infinity, so that the output voltage is equal to 0
When the bridge arm ratio n is R2/R1, the resistance variation of the strain gauge is generally much smaller than the initial resistance, so that the delta R1/R1 in the denominator can be omitted, and the strain gauge can obtain
Bridge sensitivity is defined as
The voltage sensitivity of the bridge is thus
It is proportional to the bridge supply voltage and related to the bridge-to-arm ratio n. It is readily apparent that ku takes a maximum value when n is 1, i.e. R1 is R2. In this case, ku is equal to U/4.
The direct current bridge has the advantages that a direct current power supply with high stability is easy to obtain, a bridge adjusting and balancing circuit is simple, the influence of distribution parameters of a connecting wire from a sensor to a measuring instrument is small, and the like, so that an alternating current bridge is mostly adopted by a strain bridge at present.
Example 3
Referring to fig. 2 and fig. 3, the present invention provides an embodiment: a novel resistance strain type digital weighing sensor based on temperature compensation is characterized in that when the change of strain of a strain gauge is converted into the change R of resistance to generate the voltage change of VW, the change error of Vw can be generated under the same temperature with different gravity. For example, the full-load discharge voltage is VW60 at 60 ℃, VW60 at 20 ℃, VW-30 at-30 ℃;
when the voltage variation of Vt is generated due to the variation RT of the resistance of the temperature compensation plate 4, variation error of Vt may be generated at different temperatures. For example, the full load out voltage is Vt60 at 60 deg.C, Vt60 at 20 deg.C, Vt-30 at-30 deg.C;
for example, when the reference point is only 20 ℃, we can obtain a temperature compensation equation;
when we obtain the equivalent equation of temperature compensation, we can use the ADC value of 20 ℃ as the reference to calculate X and substitute X into the formula to obtain Y, and multiply the Y value with VW to obtain the effective value after temperature compensation.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (6)
1. The utility model provides a novel resistance strain digital weighing sensor based on temperature compensation, includes sensor housing (1), first resistance foil gage (3), temperature compensation piece (4) and second resistance foil gage (5), its characterized in that: first resistance foil gage (3) are installed in the embedding of one side of sensor housing (1) top end face, second resistance foil gage (5) are installed in the embedding of the opposite side of sensor housing (1) top end face, temperature compensation piece (4) are installed in the middle embedding of sensor housing (1) top end face.
2. The novel resistance strain digital weighing sensor based on temperature compensation according to claim 1, characterized in that: the first resistance strain gauge (3) and the second resistance strain gauge (5) are symmetrically distributed along the central axis of the top end of the sensor shell (1).
3. The novel resistance strain digital weighing sensor based on temperature compensation according to claim 1, characterized in that: the sensor comprises a sensor shell (1), and is characterized in that embedded grooves matched with a first resistance strain gauge (3) and a second resistance strain gauge (5) are respectively formed in the top end face of the sensor shell (1), the first resistance strain gauge (3) and the second resistance strain gauge (5) are respectively installed in the embedded grooves, a recoverable elastomer structure processed by an aluminum metal material is installed in the embedded grooves in the sensor shell (1), the first resistance strain gauge (3) and the second resistance strain gauge (5) are respectively contacted with the recoverable elastomer structure to form a resistance bridge circuit, a recoverable elastomer structure processed by the aluminum metal material is arranged at the position where a temperature compensation sheet (4) is embedded in the top end face of the sensor shell (1), and the temperature compensation sheet (4) is contacted with the recoverable elastomer structure processed by the aluminum metal material.
4. The novel resistance strain digital weighing sensor based on temperature compensation according to claim 1, characterized in that: sensor PCBA (2) is installed in the positive one side embedding of sensor housing (1), and sensor PCBA (2) is connected with the built-in circuit board electricity of sensor housing (1).
5. The novel resistance strain digital weighing sensor based on temperature compensation according to claim 1, characterized in that: the sensor is characterized in that a special chip is arranged in the sensor shell (1), and the special chip is electrically connected with a circuit board arranged in the sensor shell (1).
6. The novel resistance strain digital weighing sensor based on temperature compensation according to claim 1, characterized in that: the temperature compensation sheet (4) is made of manganese copper wires and constantan copper wires which are made of high-temperature coefficient materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120586999.8U CN214843527U (en) | 2021-03-23 | 2021-03-23 | Novel resistance strain type digital weighing sensor based on temperature compensation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120586999.8U CN214843527U (en) | 2021-03-23 | 2021-03-23 | Novel resistance strain type digital weighing sensor based on temperature compensation |
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| Publication Number | Publication Date |
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| CN214843527U true CN214843527U (en) | 2021-11-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120586999.8U Active CN214843527U (en) | 2021-03-23 | 2021-03-23 | Novel resistance strain type digital weighing sensor based on temperature compensation |
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- 2021-03-23 CN CN202120586999.8U patent/CN214843527U/en active Active
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