CN213397485U - Dynamometer calibrating device - Google Patents
Dynamometer calibrating device Download PDFInfo
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- CN213397485U CN213397485U CN202021996984.0U CN202021996984U CN213397485U CN 213397485 U CN213397485 U CN 213397485U CN 202021996984 U CN202021996984 U CN 202021996984U CN 213397485 U CN213397485 U CN 213397485U
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Abstract
The utility model provides a dynamometer calibrating device, including dynamometry lever subassembly, dynamometry lever subassembly includes pressure source, sensor and dynamometry lever, and the sensor is fixed in dynamometry lever one end bottom, and the pressure source setting is in the sensor below, and sensor bottom butt is equipped with the initiative liquid section of thick bamboo on the pressure source bottom the dynamometry lever. The length of the force measuring lever is 1200 mm. The moment ratio of the force measuring lever is 1: 5. The pressure source is a jack. The dynamometer comprises a signal processing unit, a central processing unit, a display unit and an interface circuit unit, wherein the central processing unit is respectively connected with the signal processing unit, the display unit and the interface circuit unit. The calibration device is provided with a force measuring lever of 1:5, the proportion is accurate, and meanwhile, the lever proportion can be input to the self-owned force measuring lever of the device, and the test result can be directly read.
Description
Technical Field
The utility model relates to the field of machinary, especially a dynamometer calibrating device.
Background
In the safety performance test of the automobile, the braking performance is a very important index. The normal automobile safety inspection station must frequently check the braking force and the loading force of the braking platform, and the calibration can ensure the accuracy and reliability of the safety technology inspection. At present, no special metering and calibrating instrument is used for checking and calibrating the automobile brake table, a universal force measuring instrument and a universal sensor are generally configured for checking each detection station, and a result is obtained by calculating the ratio of the measured value to a lever. This method has several problems as follows. (1) The dynamometer is not matched with a used force measuring lever, and the force arm proportion of the lever cannot be displayed in the dynamometer; (2) the dynamometer is not matched with a used sensor, the input error of the sensor coefficient has certain risk (3) part of dynamometers on the market can not meet the requirement of self-calibration accuracy, and the dynamometers meeting the requirement are expensive. (4) The collected data needs manual recording, manual calculation and manual judgment to be qualified or not, the checking and calibrating efficiency is low, and the risk of errors exists.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: the utility model aims to solve the technical problem that to prior art not enough, provide a dynamometer calibrating device.
In order to solve the technical problem, the utility model provides a dynamometer calibrating device, including dynamometry lever subassembly, dynamometry lever subassembly includes pressure source, sensor and dynamometry lever, and the sensor is fixed in dynamometry lever one end bottom, and the pressure source setting is in the sensor below, and sensor bottom butt is equipped with initiative liquid section of thick bamboo on the pressure source, dynamometry lever bottom.
The utility model discloses in, dynamometry lever length is 1200 mm.
In the utility model, the torque ratio of the force measuring lever is 1: 5.
In the utility model, the pressure source is a jack.
The utility model discloses in, the dynamometer includes signal processing unit, central processing unit, display element and interface circuit unit, and central processing unit connects signal processing unit, display element and interface circuit unit respectively.
Has the advantages that: 1. the calibration device is provided with the 1:5 force measuring lever, the proportion is accurate, and meanwhile, the lever proportion can be input to the self-owned force measuring lever of the equipment, and the test result can be directly read;
2. the calibration device is provided with a motorola sensor, directly calibrates the coefficient of the instrument and directly reads out the test result; the accuracy correction is best under the condition of equal cost; has the characteristics of low cost and small size.
Drawings
These and other advantages of the invention will become apparent from the following more detailed description of the invention, when taken in conjunction with the accompanying drawings and detailed description.
FIG. 1 is a schematic view of the apparatus.
Fig. 2 is a circuit diagram.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
Example (b):
as shown in fig. 1, the calibration device for a force measuring instrument provided by this embodiment includes a force measuring lever assembly, where the force measuring lever assembly includes a pressure source 1, a sensor 2, and a force measuring lever 3, the sensor 2 is fixed at the bottom of one end of the force measuring lever 3, the pressure source 1 is disposed below the sensor 2, the bottom of the sensor 2 abuts against the pressure source 1, an active liquid cylinder 4 is disposed at the bottom of the force measuring lever, and the active liquid cylinder 4 is fixed on a bracket base 5 of the force measuring lever 3 through a U-shaped bolt 7. The load cell 6 to be calibrated is electrically connected to the sensor 2. The driving roller provides rolling force to drive the wheels to rotate when in work. When in calibration, no power is output, and a jack provides calibration force.
In this embodiment, the length of the load lever is 1200 mm.
In this embodiment, the moment ratio of the load lever is 1: 5.
In this embodiment, the pressure source is a jack.
As shown in fig. 2, in this embodiment, the force measuring instrument includes a signal processing unit, a central processing unit, a display unit, and an interface circuit unit, where the central processing unit is connected to the signal processing unit, the display unit, and the interface circuit unit, respectively. The force value signal obtained by the sensor is converted into an electric signal and sent to the dynamometer, and the dynamometer sends the signal to the signal processing unit after obtaining the signal and converts the signal into a digital signal and sends the digital signal to the central processing unit. The central processing unit sends one path of the processed data to the display unit for direct display, and sends the other path of the processed data to the notebook computer through the interface unit for analysis and processing, and a calibration record and a calibration report are generated.
Specifically, 1, a special force measuring lever
The frame-shaped chuck is used for the drum-type brake test table, and when the brake test table is used, the two frame-shaped screws and the clamping plate are respectively arranged on the edge clamp holder of the brake test table and the screw cap is screwed up to be fixed. According to the national standard, the diameter of the roller is 240mm, the total length of an effective area of the force measuring lever is 1200mm, and the actual calibration torque ratio is 1:5 after the manufacture is finished. The diameter of the roller can also be actually measured, and then an actual value such as 216mm and 330mm is input, and the system can directly calculate.
2. Testing instrument
The digital force measuring instrument can adopt a piezoresistive pressure sensor. The piezoresistive pressure sensor is a device manufactured by utilizing the piezoresistive effect of monocrystalline silicon, namely, the resistance value of a component is changed into a physical phenomenon after the component is subjected to an acting force. On a silicon chip, four equivalent thin film resistors made by an integrated circuit process form a Wheatstone bridge, when the silicon chip is not acted by an acting force, the voltage is in a balanced state, no voltage is output, when the silicon chip is acted by the acting force, one pair of bridge arm resistors become large, the other pair of bridge arm resistors become small, the bridge loses balance, voltage is output, and the output voltage of the bridge is in direct proportion to the pressure.
The piezoresistive pressure sensor is powered by a constant voltage source or a constant current source, but in order to ensure that the circuit of the piezoresistive pressure sensor is reliable and can be suitable for sensors with different types and different resistance values, the piezoresistive pressure sensor adopts the constant voltage source, and the output voltage of the electric bridge is in direct proportion to delta R/R, namely the output of the electric bridge.
When the instrument is selected for use, the instrument supplies power for direct current, and a sensor with 3-5V power supply voltage is selected. A pressure sensor suitable for use in the model of Motorola MPX700 is connected with an instrument to form a pressure difference and vacuum pressure measuring instrument, the measuring range is 0-7MPa, the sensor adopts 3V, when the power supply voltage supplies power, the nominal full-range voltage output is 60mV, the zero offset voltage is in the range of 0-35mV, and the problem can be solved by software zero adjustment measures
When the device is used for brake calibration, a resistance strain gauge is commonly used, and a test circuit has the same principle as a pressure sensor. The method is characterized in that a strain foil film is adhered to an object which is stressed to deform by special glue, a Wheatstone bridge method is also adopted, four resistors can be separated or can be positioned at the same position, and a method of two transverse sticking and two longitudinal sticking is generally adopted. When external force acts on an elastic element of the sensor, the elastic element generates strain relative deformation, and the relative change rate DeltaR/R of the resistance value is in direct proportion to the strain, so that the DeltaR/R is in direct proportion to the external force P.
In practice, the 350 omega strain gauge of the medium-sized avionics measuring instrument company Limited has the best performance, and the use temperature coefficient is very small in the environment of-30-60 ℃. The output voltage of the strain gauge, the probe coefficient after being processed into the probe is shown as follows, wherein E is input voltage (V), E is output voltage (mV),
f is the pressure (N) applied to the probe.
Communication and calibration software:
the calibration data is connected with a computer through an RS232 interface (a data line for converting RS232 to USB), and the calculation and the printing of an original report are realized through self-programming software.
The utility model provides a dynamometer calibrating device, the method and the way of specifically realizing this technical scheme are many, above only the utility model discloses a preferred embodiment should point out, to the ordinary skilled person in this technical field, not deviating from the utility model discloses under the prerequisite of principle, can also make a plurality of improvements and moist decorations, these improvements should also be regarded as with moist decorations the utility model discloses a protection scope. All the components not specified in the present embodiment can be realized by the prior art.
Claims (1)
1. A force measuring instrument calibration device is characterized by comprising a force measuring lever assembly, wherein the force measuring lever assembly comprises a pressure source, a sensor and a force measuring lever, the sensor is fixed at the bottom of one end of the force measuring lever, the pressure source is arranged below the sensor, the bottom of the sensor is abutted against the pressure source, and the bottom of the force measuring lever is arranged on a driving roller of a device to be calibrated;
the length of the force measuring lever is 1200 mm;
the torque ratio of the force measuring lever is 1: 5;
the pressure source is a jack;
the dynamometer comprises a signal processing unit, a central processing unit, a display unit and an interface circuit unit, wherein the central processing unit is respectively connected with the signal processing unit, the display unit and the interface circuit unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021996984.0U CN213397485U (en) | 2020-09-11 | 2020-09-11 | Dynamometer calibrating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021996984.0U CN213397485U (en) | 2020-09-11 | 2020-09-11 | Dynamometer calibrating device |
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| CN213397485U true CN213397485U (en) | 2021-06-08 |
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| CN202021996984.0U Active CN213397485U (en) | 2020-09-11 | 2020-09-11 | Dynamometer calibrating device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113405984A (en) * | 2021-06-26 | 2021-09-17 | 南京熙赢测控技术有限公司 | Calibration system and method for longitudinal force friction coefficient tester |
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2020
- 2020-09-11 CN CN202021996984.0U patent/CN213397485U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113405984A (en) * | 2021-06-26 | 2021-09-17 | 南京熙赢测控技术有限公司 | Calibration system and method for longitudinal force friction coefficient tester |
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