Temperature interference resistant intelligent pressure detection device and system

Abstract

The utility model provides an intelligent pressure detection device and system resistant to temperature interference. The problem that the accuracy of pressure data in a pressure detection system is reduced is effectively solved. The intelligent pressure detection device comprises a pressure measuring module, a controller, a data receiving module and a data processing module, the data receiving module is respectively connected with the pressure measuring module and the data processing module, and the data processing module is also connected with the controller; the pressure measuring module is used for performing pressure detection on an object to be measured to obtain a pressure signal and outputting the pressure signal to the data receiving module; the data receiving module is used for receiving the pressure signal output by the pressure measuring module, pre-processing the pressure signal and outputting the pre-processed pressure signal to the data processing module; and the data processing module is used for performing temperature processing on the preprocessed pressure signal output by the data receiving module and outputting the pressure signal subjected to temperature processing to the controller.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of weighing measurement, in particular to an intelligent pressure detection device and system resistant to temperature interference. BACKGROUND

[0002] The application field of weighing measurement technology has spread to metallurgy, transportation, railway, electric power, building materials, chemical industry, light industry and other departments. In order to improve the precision, Zhongli Zhou et al. set a spiral cooling pipe in the pressure detection device in patent CN202020736077.6 to reduce the temperature generated by the operation of the machine and improve the precision of the detection device. However, in actual production, the measurement value of the weighing sensor fluctuates greatly due to the influence of the outdoor test environment, and the accuracy of the measurement value measured by the weighing sensor cannot be guaranteed. The weighing sensor generally uses a pressure sensor, and the measurement value is the pressure signal generated by the object to be measured. The pressure signal generated by the pressure sensor when measuring the object to be measured will inevitably be affected by the temperature, which reduces the accuracy of the pressure data measured by the pressure sensor and also reduces the accuracy of the pressure detection device.

[0003] To this end, the traditional signal conditioning circuit such as Figure 1 As shown, can produce certain conditioning effect on pressure data, although the operational amplifier has common mode rejection capability, however, due to the existence of gain resistor, its common mode interference is not completely the same as the positive and negative input terminals of the amplifier, which leads to the fact that the common mode interference signal cannot be effectively suppressed, and the influence of temperature on pressure data cannot be processed, so the accuracy of the pressure data output by the pressure detection system cannot be guaranteed. CONTENT OF THE INVENTION

[0004] Therefore, the present application provides an intelligent pressure detection device and system resistant to temperature interference, which effectively solves the problem of the decrease in the accuracy of the pressure data in the pressure detection system.

[0005] In a first aspect, the present application provides an intelligent pressure detection device resistant to temperature interference, which comprises a pressure measurement module, a controller, a data receiving module and a data processing module; the data receiving module is connected to the pressure measurement module and the data processing module respectively, and the data processing module is further connected to the controller;

[0006] The pressure measurement module is used for pressure detection of the object to be measured to obtain a pressure signal, and outputs the pressure signal to the data receiving module;

[0007] The data receiving module is used for receiving the pressure signal output by the pressure measurement module, and outputs the pressure signal after preprocessing to the data processing module;

[0008] The data processing module is configured to perform temperature processing on the preprocessed pressure signal output by the data receiving module and output the temperature-processed pressure signal to the controller.

[0009] The controller is configured to receive the temperature-processed pressure signal output by the data processing module.

[0010] In some embodiments, the signal processing module comprises a differential operator and a converter; the differential operator is connected to the data receiving module and the converter, and the converter is connected to the controller.

[0011] The differential operator is configured to perform temperature processing on the preprocessed pressure signal output by the data receiving module and output the temperature-processed pressure signal to the converter.

[0012] The converter is configured to convert the state of the temperature-processed pressure signal and output the converted pressure signal to the controller.

[0013] In some embodiments, the differential operator comprises two operational amplifiers, two capacitors, and a plurality of resistors.

[0014] In some embodiments, the data receiving module comprises an amplifier and a filter; the amplifier is connected to the pressure measurement module and the filter, and the filter is further connected to the data processing module.

[0015] The amplifier is configured to amplify the pressure signal output by the pressure measurement module and output the amplified pressure signal to the filter.

[0016] The filter is configured to filter the amplified pressure signal and send the filtered pressure signal to the data processing module.

[0017] In some embodiments, the pressure measurement module comprises a plurality of pressure sensors, which are symmetrically arranged below the object to be measured.

[0018] In some embodiments, the pressure measurement module further comprises an excitation unit configured to excite the plurality of pressure sensors.

[0019] In some embodiments, the excitation unit comprises an alternating current excitation source.

[0020] In some embodiments, the intelligent pressure detection device further comprises a display module connected to the controller.

[0021] The controller is further configured to send the received temperature-processed pressure signal to the display module.

[0022] The display module is configured to receive and display the pressure signal sent by the controller.

[0023] In some embodiments, the controller comprises a storage unit configured to store the pressure signal processed by the data processing module.

[0024] In a second aspect, the embodiments of the present application further provide an intelligent pressure detection system resistant to temperature interference, comprising the intelligent pressure detection device resistant to temperature interference and the server.

[0025] The server is configured to send a detection instruction to the intelligent pressure detection device.

[0026] The intelligent pressure detection device is configured to receive the detection instruction and perform pressure detection on the object to be detected in response to the detection instruction.

[0027] The embodiments of the present application have the following beneficial effects:

[0028] The embodiments of the present application provide an intelligent pressure detection device resistant to temperature interference, which comprises a pressure measurement module, a controller, a data receiving module and a data processing module. The data receiving module is connected to the pressure measurement module and the data processing module, and the data processing module is further connected to the controller. The pressure measurement module is configured to perform pressure detection on an object to be detected to obtain a pressure signal and output the pressure signal to the data receiving module. The data receiving module is configured to receive the pressure signal output by the pressure measurement module, pre-process the pressure signal and output the pre-processed pressure signal to the data processing module. The data processing module is configured to perform temperature processing on the pre-processed pressure signal output by the data receiving module and output the temperature-processed pressure signal to the controller. The controller is configured to receive the temperature-processed pressure signal output by the data processing module, perform temperature processing on the pressure signal based on the data processing module, thereby eliminating the influence of temperature on the pressure signal and ensuring the accuracy of the pressure signal and the accuracy of the pressure detection system. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0030] Figure 1 A conventional signal conditioning circuit diagram provided by the embodiments of the present application is shown.

[0031] Figure 2 A structural schematic diagram of an intelligent pressure detection device against temperature interference is shown;

[0032] Figure 3 A circuit diagram of a differential operator is shown;

[0033] Figure 4 A circuit bridge structure schematic diagram for eliminating AC offset voltage is shown;

[0034] Figure 5 A structural schematic diagram of an intelligent pressure detection system against temperature interference is shown.

[0035] Main symbol explanation:

[0036] 1-intelligent pressure detection device; 2-server; 11-pressure measurement module; 12-controller;

[0037] 13-data receiving module; 14-data processing module; 111-pressure sensor; 112-excitation unit;

[0038] 131-amplifier; 132-filter; 141-differential operator; 142-converter; 15-display module;

[0039] 121-storage unit. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all embodiments of the present application.

[0041] The components of the embodiments of the present application generally described and shown in the accompanying drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0042] Hereinafter, the terms "include", "have", and their conjugates, used in the various embodiments of the present application, merely indicate the presence of the features, numbers, steps, operations, elements, components, or combinations thereof, and do not preclude the presence or addition of one or more other features, numbers, steps, operations, elements, components, or combinations thereof.

[0043] In addition, the terms "first", "second", "third", and the like are used only to distinguish descriptions, and are not to be understood as indicating or implying relative importance.

[0044] Unless defined otherwise, all terms used herein (including technical terms and scientific terms) have the same meanings as those generally understood by those having ordinary knowledge in the art to which various embodiments of the present application belong. Such terms, as defined in generally used dictionaries, will be interpreted to have the same meanings as those in the context of relevant technology and will not be interpreted to have ideal or excessively formal meanings, unless clearly defined in various embodiments of the present application.

[0045] At present, the conventional signal conditioning circuit has a certain conditioning effect on the pressure data, and the operational amplifier in the signal conditioning circuit has a common mode rejection capability, but due to the existence of the gain resistor, the common mode interference is not completely the same to be added to the positive and negative input terminals of the amplifier, so that the common mode interference signal cannot be effectively suppressed, the influence of temperature on the pressure data cannot be processed, and the accuracy of the pressure data output by the pressure detection system cannot be guaranteed.

[0046] Based on this, the intelligent pressure detection device and system against temperature interference provided by the embodiment of the present application effectively solve the problem of the accuracy of the pressure data in the pressure detection system, and the temperature of the pressure signal is processed based on the data processing module, so as to eliminate the influence of temperature on the pressure signal and guarantee the accuracy of the pressure signal and the accuracy of the pressure detection system.

[0047] In order to understand the present embodiment, first, a kind of intelligent pressure detection device against temperature interference disclosed by the embodiment of the present application is introduced in detail.

[0048] Embodiment 1

[0049] Please refer to Figure 2The application discloses an intelligent pressure detection device 1 which is temperature interference resistant, and belongs to the technical field of pressure detection devices.

[0050] The pressure detection module 11 is used for detecting the pressure of the object to be detected to obtain a pressure signal and outputting the pressure signal to the data receiving module 13.

[0051] The data receiving module 13 is used for receiving the pressure signal output by the pressure detection module 11, pre-processing the pressure signal and outputting the pre-processed pressure signal to the data processing module 14.

[0052] The data processing module 14 is used for temperature processing the pre-processed pressure signal output by the data receiving module 13 and outputting the temperature-processed pressure signal to the controller 12.

[0053] The controller 12 is used for receiving the temperature-processed pressure signal output by the data processing module 14.

[0054] The intelligent pressure detection device is used for controlling the weight of the object to be detected according to the pressure signal of the object to be detected. The pressure detection module 11 included in the intelligent pressure detection device detects the pressure of the object to be detected to obtain a pressure signal, that is, the weight signal of the object to be detected. The weight of the object to be detected can be measured through the pressure signal. The pressure signal detected by the pressure detection module 11 is output to the data receiving module 13. The communication mode between the pressure detection module 11 and the data receiving module 13 can be wired transmission mode or wireless transmission mode. The actual situation can be specifically selected. For example, when the distance between the pressure detection module and the data receiving module is short or the wireless network in the area where the pressure detection module is located is poor, the wired transmission mode can be adopted. When the distance between the pressure detection module and the data receiving module is long, the pressure signal can be transmitted in the wireless transmission mode.

[0055] The data receiving module 13 is used for pre-processing the pressure signal detected by the pressure detection module 11, so that the temperature processing of the pre-processed pressure signal by the data processing module 14 is more accurate. The influence of the environmental temperature of the object to be detected on the detected pressure signal is avoided, and the accuracy of the pressure signal is ensured.

[0056] The controller 12 receives the temperature-processed pressure signal and converts the pressure signal to obtain the weight of the object to be measured. The controller can adopt a chip with signal receiving, signal data processing and signal sending functions, such as a single-chip microcomputer chip or an ARM chip.

[0057] In combination with the above embodiment, the data processing module 14 comprises a differential calculator 141 and a converter 142. The differential calculator 141 is connected to the data receiving module 13 and the converter 142. The converter 142 is connected to the controller 12.

[0058] The differential calculator 141 is configured to perform temperature processing on the pre-processed pressure signal output by the data receiving module 13 and output the temperature-processed pressure signal to the converter 142.

[0059] The converter 142 is configured to convert the state of the temperature-processed pressure signal and output the converted pressure signal to the controller 12.

[0060] The differential calculator 141 processes the pre-processed pressure signal transmitted by the data receiving module 13, extracts the positive signal and the negative signal of the pre-processed pressure signal respectively, and performs differential calculation on the positive signal and the negative signal respectively, thereby achieving temperature processing on the pre-processed pressure signal, avoiding the influence of temperature on the pressure signal, and further ensuring the accuracy of the pressure signal.

[0061] The converter 142 is configured to convert the state of the temperature-processed pressure signal and output the converted pressure signal to the controller 12. The pressure signal is generally in an analog state, while the pressure signal recognizable by the controller is in a digital state. Therefore, the converter 142 is needed to convert the temperature-processed pressure signal from the analog state to the digital state. In actual use, an A / D converter can be used to achieve the conversion.

[0062] In combination with the above embodiment, the differential calculator 141 comprises two operational amplifiers, two capacitors and a plurality of resistors, such as Figure 3As shown in the connection mode of two operational amplifiers U1A and U1B, two capacitors and a plurality of resistors in the differential operational amplifier 141, Vin+ and Vin- are the positive and negative signals of the preprocessed pressure signal respectively, the positive and negative signals are connected to the input terminals of the operational amplifiers U1A and U1B through resistors R1 and R2 feedback resistors respectively, the feedback network of each operational amplifier is composed of resistor R5 and capacitor C1, resistor R6 and capacitor C2, which can control the gain between the two operational amplifiers, resistors R3-R6 and capacitors C1-C2 are the matching components of the differential operational amplifier 141, which are used to realize the function of difference, and R1=R2=R3=R4, R7=R8, R5=R6, the differential operational amplifier 141 calculates the input voltage difference of the positive and negative signals as Vin, the input common-mode voltage as Vem, and the output voltage difference as Vout; wherein the output voltage difference Vout is the temperature-processed pressure signal, and the voltage at point A in the differential operational amplifier 141 is:

[0063]

[0064] The voltage at point B in the circuit is:

[0065] V B =V in +v cm (2)

[0066] The voltage at point C in the circuit is:

[0067] V C =V cm (3)

[0069] The voltage at point D in the circuit is:

[0070]

[0071] According to formula (1) and formula (4), the output voltage difference of the differential operational amplifier 141, i.e. the temperature-processed pressure signal, is:

[0072]

[0073] In combination with the above embodiment, the data receiving module 13 includes an amplifier 131 and a filter 132; the amplifier 131 is connected to the pressure measurement module 11 and the filter 132 respectively, and the filter 132 is further connected to the data processing module 14;

[0074] The amplifier 131 is configured to amplify the pressure signal output by the pressure measurement module 11 and output the amplified pressure signal to the filter 132;

[0075] The filter 132 is configured to filter the amplified pressure signal and send the filtered pressure signal to the data processing module 14.

[0076] The data receiving module 13 is configured to receive the pressure signal measured by the pressure measurement module, and to pre-process the pressure signal to ensure that the data processing module can process the pressure signal at a temperature. The amplifier 131 in the data receiving module is configured to amplify the pressure signal to avoid excessive attenuation of the pressure signal during transmission to the data receiving module, or to amplify the pressure signal when the weight of the object to be measured is small, resulting in a small amplitude of the measured pressure signal. The amplifier 131 can be implemented by a triode, an operational amplifier, or other devices with amplification function. The amplified signal is filtered by the filter 132 to avoid noise interference during transmission of the pressure signal to the data receiving module 13. The filter 132 can be a low-pass filter, a high-pass filter, a passive filter, or an active filter. The specific structure of the filter 132 can be selected according to the frequency of the noise and the frequency of the pressure signal.

[0077] In combination with the above embodiment, the pressure measurement module 11 includes a plurality of pressure sensors 111, which are symmetrically arranged below the object to be measured.

[0078] The pressure measurement module 11 is arranged below the object to be measured to collect the pressure signal generated by the object to be measured. To ensure the accuracy of the measured pressure signal, a plurality of pressure sensors are arranged. Through reasonable layout and joint measurement method, the plurality of pressure sensors can jointly act on the measurement area of the object to be measured to obtain pressure data from multiple angles and positions. These data can be combined through algorithms and other technologies to reduce the measurement inaccuracy caused by single sensor error. The redundant data provided by the plurality of sensors can be mutually verified. When the data of a certain sensor is abnormal, the data of other sensors can be used for correction or replacement to ensure the stability of the measurement result, thereby improving the credibility and accuracy of the measured pressure signal.

[0079] In combination with the above embodiment, the pressure measurement module 11 further includes an excitation unit 112, which is configured to excite the plurality of pressure sensors 111.

[0080] The plurality of pressure sensors 111 in the pressure measurement module 11 are passive sensors that require external excitation to ensure the test accuracy and reliability of the pressure measurement module.

[0081] In combination with the above embodiment, the excitation unit 112 comprises an alternating excitation source.

[0082] The excitation unit 112 is an alternating excitation source, which can avoid the direct current error signal mixed in the pressure signal caused by the direct current bias and the thermal couple effect of the parasitic signal induced by the direct current excitation source, and the direct current bias is not a fixed problem, thereby greatly improving the test precision of the pressure measurement module. Figure 4 As shown in the figure, it is the bridge voltage output situation diagram when forward excitation and reverse excitation:

[0083] When forward excitation:

[0084] U out = U A + E on (6)

[0085] When reverse excitation:

[0086] U out = U A - E on (7)

[0087] It is not difficult to see that the sum of the alternating bias voltage Eon is eliminated in the two measurements, so through the alternating excitation source, the interference of the alternating bias voltage in series with the pressure signal in the pressure measurement module can be effectively suppressed, so the anti-interference ability is strong, and therefore the intelligent pressure detection device has the effect of strong anti-interference ability.

[0088] In combination with the above embodiment, the intelligent pressure detection device 1 further comprises a display module 15, and the display module 15 is connected to the controller 12.

[0089] The controller 12 is further configured to send the received temperature-processed pressure signal to the display module 15.

[0090] The display module 15 is configured to receive and display the pressure signal sent by the controller 12.

[0091] The controller 12 sends the received temperature-processed pressure signal of the signal processing module to the display module 15, and the display module 15 displays the pressure signal in the form of data to facilitate the staff to watch and record.

[0092] In combination with the above embodiment, the controller 12 comprises a storage unit 121 configured to store the received temperature-processed pressure signal of the data processing module.

[0093] The storage unit 121 included in the controller 12 stores the temperature-processed pressure signal received by the controller 12 in a predefined storage manner for calling when needed, facilitating backtracking, and the storage unit 121 can be any form of storage device, such as RAM (for temporary storage), EEPROM, Flash memory, hard disk drive, or cloud storage, etc.

[0094] Embodiment 2

[0095] The embodiments of the present application also provide an intelligent temperature interference-resistant pressure detection system, which comprises the intelligent temperature interference-resistant pressure detection device 1 and the server 2. Figure 5 The system comprises the intelligent temperature interference-resistant pressure detection device 1 and the server 2, and the intelligent temperature interference-resistant pressure detection device 1 is in communication connection with the server 2.

[0096] The server 2 is configured to send a detection instruction to the intelligent temperature interference-resistant pressure detection device 1.

[0097] The intelligent temperature interference-resistant pressure detection device 1 is configured to receive the detection instruction and perform pressure detection on the object to be detected in response to the detection instruction.

[0098] The intelligent temperature interference-resistant pressure detection device 1 is controlled by the server 2, and after receiving the detection instruction output by the server 2, the intelligent temperature interference-resistant pressure detection device 1 performs pressure detection on the object to be detected in response to the detection instruction, so as to obtain the pressure signal of the object to be detected, the detection instruction is generated in advance and stored in the server, or is generated in real time by the server based on production requirements, the server 2 can control multiple intelligent temperature interference-resistant pressure detection devices 1 at the same time, so as to achieve the effect of simultaneously controlling multiple intelligent temperature interference-resistant pressure detection devices 1 to perform pressure detection on the object to be detected, and after the intelligent temperature interference-resistant pressure detection device 1 completes the pressure detection on the object to be detected, the controller 12 receives the processed pressure signal, and the controller 12 outputs the processed pressure signal to the server 2.

[0099] The intelligent temperature interference-resistant pressure detection system provided by the embodiments has the same technical features as the intelligent temperature interference-resistant pressure detection device provided by the above-mentioned embodiments, so it can also solve the same technical problems and achieve the same technical effects.

[0100] Finally, it should be noted that the above-described embodiments are merely specific embodiments of the present application, which are used to illustrate the technical solutions of the present application, but not to limit the same, and the protection scope of the present application is not limited thereto. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily think of changes to the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to some of the technical features within the technical range disclosed by the present application; and these modifications, changes or replacements do not cause the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A temperature interference resistant intelligent pressure detection device, characterized in that, The intelligent pressure detection device comprises a pressure measurement module, a controller, a data receiving module and a data processing module; the data receiving module is connected to the pressure measurement module and the data processing module respectively, and the data processing module is further connected to the controller; The pressure measurement module is configured to detect the pressure of the object to be measured to obtain a pressure signal and output the pressure signal to the data receiving module; The data receiving module is configured to receive the pressure signal output by the pressure measurement module, pre-process the pressure signal and output the pre-processed pressure signal to the data processing module; The data processing module is configured to perform temperature processing on the pre-processed pressure signal output by the data receiving module and output the temperature-processed pressure signal to the controller; The controller is configured to receive the temperature-processed pressure signal output by the data processing module.

2. The smart pressure detection device of claim 1, wherein, The data processing module comprises a differential operator and a converter; the differential operator is connected to the data receiving module and the converter, and the converter is connected to the controller; The differential operator is configured to perform temperature processing on the pre-processed pressure signal output by the data receiving module and output the temperature-processed pressure signal to the converter; The converter is configured to convert the state of the temperature-processed pressure signal and output the converted pressure signal to the controller.

3. The smart pressure detection device of claim 2, wherein, The differential operator comprises two operational amplifiers, two capacitors and a plurality of resistors.

4. The smart pressure detection device of claim 1, wherein, The data receiving module comprises an amplifier and a filter; the amplifier is connected to the pressure measurement module and the filter respectively, and the filter is further connected to the data processing module; The amplifier is configured to amplify the pressure signal output by the pressure measurement module and output the amplified pressure signal to the filter; The filter is configured to filter the amplified pressure signal and send the filtered pressure signal to the data processing module.

5. The smart pressure detection device of claim 1, wherein, The pressure measurement module comprises a plurality of pressure sensors, which are symmetrically arranged below the object to be measured.

6. The smart pressure detection device of claim 5, wherein, The pressure measurement module further comprises an excitation unit configured to excite the plurality of pressure sensors.

7. The smart pressure detection device of claim 6, wherein, The excitation unit comprises an alternating current excitation source.

8. The smart pressure detection device of claim 1, wherein, The intelligent pressure detection device further comprises a display module connected to the controller; The controller is further configured to send the received temperature-processed pressure signal to the display module; The display module is configured to receive and display the pressure signal sent by the controller.

9. The smart pressure detection device of claim 1, wherein, The controller comprises a storage unit configured to store the received temperature-processed pressure signal output by the data processing module.

10. A temperature interference resistant intelligent pressure detection system, characterized in that, The system comprises the temperature-interference-resistant intelligent pressure detection device of any one of claims 1-9 and a server, and the intelligent pressure detection device is communicatively connected to the server; The server is configured to send a detection instruction to the intelligent pressure detection device; The intelligent pressure detection device is configured to receive the detection instruction and perform pressure detection on the object to be measured in response to the detection instruction.

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