CN219474858U - Force sensor natural frequency measuring device - Google Patents
Force sensor natural frequency measuring device Download PDFInfo
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- CN219474858U CN219474858U CN202320519032.7U CN202320519032U CN219474858U CN 219474858 U CN219474858 U CN 219474858U CN 202320519032 U CN202320519032 U CN 202320519032U CN 219474858 U CN219474858 U CN 219474858U
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- force sensor
- extensometer
- natural frequency
- push rods
- loading device
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Abstract
The utility model provides a natural frequency measuring device of a force sensor, which comprises a loading device, a base plate, an extensometer and an upper computer electrically connected with the extensometer; the base plate is provided with hoops, a plurality of protruding parts are arranged on the hoops at equal intervals, push rods are sleeved on the protruding parts, springs are sleeved at one ends of the push rods, and push plates are fixed at one ends of the push rods; the tool bit of the extensometer is provided with a clamping mechanism, and the method comprises the steps of measuring the mass of a force sensor; by means ofThe loading device applies a force F to the force sensor of 20% of the full scale 0 Resetting the extensometer; and then applies force sensor to target load F 1 The extensometer measures the deformation L of the force sensor and finally calculates the natural frequency of the force sensor.
Description
Technical Field
The utility model relates to the field of measuring devices, in particular to a natural frequency measuring device of a force sensor.
Background
Force sensors are sensitive devices for measuring force value parameters, and can be used for measuring static force as well as dynamic force. For the measurement of static force, the force sensor and the indicating instrument thereof only need to perform indicating value calibration, but for the dynamic measurement process, not only the static sensitivity of the force sensor needs to be calibrated, but also the natural frequency of the sensor needs to be calibrated to determine whether the dynamic characteristic of the force sensor meets the dynamic measurement requirement. According to the requirements of JJG556-2011 'calibration procedure of axial loading fatigue tester', when measuring dynamic force, the natural frequency of the measuring sensor system is required to be at least 15 times of the measured frequency, which is the basic technical requirement for the force sensor when being used for dynamic measurement. If the natural frequency of the force sensor does not meet the technical requirements, the measurement error is larger, and the amplitude of the dynamic force value cannot be accurately measured.
Only a simple description of a natural frequency measurement method exists in the current technical specification, and the measurement of the natural frequency in the JJF 1053-1996 dynamic characteristic calibration Specification of a load sensor can be obtained by a resonance peak of amplitude-frequency characteristics; the dynamic force sensor calibration standard solicits comments to indicate that the natural frequency can be measured by a force hammer and a dynamic signal analyzer.
Both of the above measurement methods belong to the dynamic measurement method. The conventional method for measuring the natural frequency generally adopts a random vibration method and a pulse vibration method.
The random vibration method is to mount a load cell on a vibration test bed, give a random vibration signal, measure the vibration signal of a response point, and convert the time domain curve of the signal into a frequency domain curve by FFT conversion. And measuring the natural frequency of the measured sensor according to the frequency domain curve.
The pulse vibration method is to hang the sensor to be measured by a hanging device, and for the sensor with small measuring range, a pulse hammer can be adopted to give an impact pulse to the sensor; for a larger-range force sensor, the frequency response characteristic of a signal needs to be measured by using a drop hammer standard device, so that the natural frequency of the measured sensor is obtained.
By using the method, although the natural frequency of the force sensor can be measured theoretically, various influences exist in the actual measurement process, and the measurement accuracy is low or the measurement uncertainty is large.
1) The sensor mounting positions are different, and the uncertainty introduced by the vibration and measurement device can influence the measurement result. Whether a random vibration method or a pulse vibration method is utilized, the different mounting positions of the force sensor on the vibration test bed or the suspension mechanism can cause larger deviation of the measurement result; the degree of distortion, uniformity, stability of the vibrating table and uncertainty introduced by the frequency response measuring instrument are also large.
2) The excitation of different positions of the force sensor also has a large influence. Whether the natural frequency test of the force sensor is carried out by a random vibration method or a pulse vibration method, if the position of the excitation point is changed, the natural frequency measurement result also changes to a certain extent.
The reason for the above effect is that the structure of the sensor to be measured is not a completely regular structure, so that the measurement result is greatly affected regardless of the installation position or the excitation point position, and the measurement uncertainty of the natural frequency is large.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art and provide a natural frequency measuring device of a force sensor so as to solve the technical problems in the background art.
The aim of the utility model is realized by the following technical scheme:
the natural frequency measuring device of the force sensor comprises a loading device, a base plate, an extensometer and an upper computer electrically connected with the extensometer;
the base plate is provided with hoops, a plurality of protruding parts are arranged on the hoops at equal intervals, push rods are sleeved on the protruding parts, springs are sleeved at one ends of the push rods, push plates are further fixed at one ends of the push rods, lock nuts are arranged at the other ends of the push rods, and the push rods are fixed on the hoops through the lock nuts;
the tool bit of extensometer is equipped with clamping mechanism, clamping mechanism includes dead lever and regulation pole, the dead lever includes mutually perpendicular fixed part and regulation portion, it is in to adjust pole sliding connection on the regulation portion, adjust the centre gripping chamber that forms between pole and the fixed part and be used for centre gripping force transducer, adjust the pole through follow regulation portion sliding adjustment the size in centre gripping chamber still is provided with the mounting groove that is used for installing the tool bit of extensometer on the regulation pole.
In the above summary, further, the adjusting portion is provided with a chute, and one end of the adjusting rod passes through the chute and is fixed on the adjusting portion by an adjusting nut.
In the above summary, further, a first arc-shaped groove and a second arc-shaped groove are respectively disposed on the inner walls of the push plate and the fixing portion.
In the above summary, further, anti-skidding lines are disposed on the inner wall of the push plate, the inner wall of the fixing portion, the inner wall of the first arc-shaped groove, and the inner wall of the second arc-shaped groove.
In the above summary, further, the loading device is a dead weight loading device, an electric loading device or a hydraulic loading device.
The beneficial effects of the utility model are as follows:
according to the utility model, the force sensor is fixed, and the device provided by the utility model is used for measuring the natural frequency under static state, so that the influence of position factors in a dynamic measurement method is overcome, and the measurement accuracy of the natural frequency of the force sensor is improved.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
FIG. 2 is a schematic view of a hoop structure of the present utility model;
FIG. 3 is a schematic view of a clamping structure according to the present utility model;
FIG. 4 is a schematic view of the connection between the clamping mechanism and the tool bit of the present utility model.
In the figure, 1-loading device, 2-base plate, 3-extensometer, 3.1-tool bit, 4-host computer, 5-hoop, 5.1 bellying, 6-push rod, 7-spring, 8-push pedal, 8.1-first arc wall, 9-lock nut, 10-dead lever, 10.1-fixed part, 10.2-adjusting part, 10.3-spout, 10.4-second arc wall, 11-adjusting lever, 11.1-mounting groove, 12-clamping chamber, 13-adjusting nut, 14-force transducer.
Detailed Description
Other advantages and effects of the present utility model will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present utility model with reference to specific examples. The utility model may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present utility model. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.
It should be noted that the illustrations provided in the following embodiments merely illustrate the basic concept of the present utility model by way of illustration, and only the components related to the present utility model are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.
Examples:
referring to fig. 1-3, a natural frequency measuring device of a force sensor comprises a loading device 1, a base plate 2, an extensometer 3 and an upper computer 4 electrically connected with the extensometer 3; the loading device 1 is a dead weight loading device, an electric loading device or a hydraulic loading device.
Be equipped with hoop 5 on the bed plate 2, the last equidistance of hoop 5 is provided with a plurality of bellying 5.1, the cover is equipped with push rod 6 on the bellying 5.1, the one end cover of push rod 6 is equipped with spring 7, and push rod 7's one end still is fixed with push pedal 8, is equipped with lock nut 9 on the other end of push rod 6, and push rod 6 passes through lock nut 9 fixes on hoop 5, and when implementing in particular, can set up four push rods 6 on hoop 5, the push pedal 8 that is connected with four push rods 6 can form a rectangle and hold the space centre gripping and wait to measure the force sensor.
The tool bit 3.1 of the extensometer 3 is provided with a clamping mechanism, the clamping mechanism comprises a fixed rod 10 and an adjusting rod 11, the fixed rod 10 comprises a fixed part 10.1 and an adjusting part 10.2 which are perpendicular to each other, the adjusting rod 11 is slidably connected to the adjusting part 10.2, a clamping cavity 12 for clamping a force sensor is formed between the adjusting rod 11 and the fixed part 10.1, the adjusting rod 11 slidably adjusts the size of the clamping cavity 12 along the adjusting part 10.2, the adjusting rod 11 is further provided with a mounting groove 11.1 for mounting the tool bit 3.1 of the extensometer 3, specifically, the adjusting part 10.2 is provided with a sliding groove 10.3, one end of the adjusting rod 11 penetrates through the sliding groove 10.3 and is fixed to the adjusting part 10.2 through an adjusting nut 13, specifically, as shown in fig. 4, the two tool bits 3.1 of the extensometer 3 are firstly mounted in the mounting groove 11.1 of the adjusting rod 11, the adjusting nut 13 is loosened, the adjusting rod 11 is made to slide in the sliding groove 10.3 and adjust the size of the clamping cavity 12, the opening size of the clamping cavity 12 is finally matched with the force sensor 14 to be detected, and the two force sensors are finally fixed to the two force sensors are fastened to the adjusting mechanism 14.
In the use process, the bottom of the force sensor 14 to be tested is placed into a clamping space surrounded by the push plate 8, the push plate 8 abuts against the force sensor 14 under the action of the spring 7, the locking nut 9 is screwed to prevent the force sensor 14 from moving in the test process, then the two tool bits 3.1 of the extensometer 3 are inserted into the chute 10.3, and finally the force sensor 14 is fixed on the two clamping mechanisms, so that the force sensor 14 can be measured by the extensometer 3.
In the above embodiment, as a preference, the inner walls of the push plate 8 and the fixing portion 10.1 are respectively provided with the first arc-shaped groove 8.1 and the second arc-shaped groove 10.4, so that the force sensor with the arc-shaped outer wall is conveniently and fixedly clamped, and more preferably, the inner walls of the plate 8, the fixing portion 10.1, the inner walls of the first arc-shaped groove 8.1 and the inner walls of the second arc-shaped groove 10.4 are all provided with anti-skid patterns, thereby enhancing the clamping and fixing effects.
In measuring the force sensor 14, the measuring method specifically includes the steps of:
s1, measuring the mass m of the force sensor, then fixing the force sensor 14 on the base plate 2, and fixing the extensometer 3 on the force sensor 14;
s2, applying force F with 20% of full range to the force sensor by using the loading device 0 Resetting the extensometer;
s3, applying force sensor to target load F 1 The extensometer measures the deformation L of the force sensor;
the physical formula of the natural frequency of the object is:
m is the mass of the force sensor;
k is the force sensor stiffness.
The rigidity K of the sensor is equal to the ratio between the load born by the force sensor and the deformation generated by the force of the force sensor. The capacity of the sensor for resisting deformation under static load is static rigidity, the capacity of the sensor for resisting deformation under alternating load is dynamic rigidity, and if the alternating load frequency is far smaller than the natural frequency of the sensor, the magnitudes of the dynamic rigidity and the static rigidity are basically the same. According to JJG556-2011, the natural frequency is more than 15 times of the measured frequency, and the static rigidity can be used for representing the rigidity of the sensor. I.e.
F is the static state to which the force sensor is subjectedLoad value (i.e. F 1 And F is equal to 0 Is a difference of (2);
l is the deformation amount of the sensor when receiving static load F;
s4, calculating the natural frequency f of the force transducer, wherein the calculation formula is as follows:
the accuracy level of the force value and the quality standard is not more than 0.1 level, the accuracy level of the extensometer is not more than 0.5 level, the measuring process is simple, and the measuring process is easier to realize than the dynamic method measuring. And through the comparative verification of the dynamic method measurement, the results obtained by the static method and the dynamic method measurement have good consistency. The natural frequency of the force sensor can be obtained more accurately by using the static measurement method, the position influence factors in the dynamic measurement method are eliminated, the measurement uncertainty of the natural frequency of the force sensor is improved, and the measurement uncertainty can be better than 5% (k=2).
The foregoing examples merely illustrate specific embodiments of the utility model, which are described in greater detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model.
Claims (5)
1. The natural frequency measuring device of the force sensor is characterized by comprising a loading device, a base plate, an extensometer and an upper computer electrically connected with the extensometer;
the base plate is provided with hoops, a plurality of protruding parts are arranged on the hoops at equal intervals, push rods are sleeved on the protruding parts, springs are sleeved at one ends of the push rods, push plates are further fixed at one ends of the push rods, lock nuts are arranged at the other ends of the push rods, and the push rods are fixed on the hoops through the lock nuts;
the tool bit of extensometer is equipped with clamping mechanism, clamping mechanism includes dead lever and regulation pole, the dead lever includes mutually perpendicular fixed part and regulation portion, it is in to adjust pole sliding connection on the regulation portion, adjust the centre gripping chamber that forms between pole and the fixed part and be used for centre gripping force transducer, adjust the pole through follow regulation portion sliding adjustment the size in centre gripping chamber still is provided with the mounting groove that is used for installing the tool bit of extensometer on the regulation pole.
2. The device for measuring the natural frequency of a force sensor according to claim 1, wherein the adjusting part is provided with a chute, and one end of the adjusting rod passes through the chute and is fixed on the adjusting part by an adjusting nut.
3. The device for measuring natural frequencies of force sensor according to claim 1, wherein the inner walls of the push plate and the fixing portion are respectively provided with a first arc-shaped groove and a second arc-shaped groove.
4. The device for measuring natural frequencies of force sensor according to claim 3, wherein the inner wall of the push plate, the inner wall of the fixing part, the inner wall of the first arc-shaped groove and the inner wall of the second arc-shaped groove are all provided with anti-skid patterns.
5. The force sensor natural frequency measuring device according to claim 1, wherein the loading device is a dead weight loading device, an electric loading device or a hydraulic loading device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320519032.7U CN219474858U (en) | 2023-03-16 | 2023-03-16 | Force sensor natural frequency measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320519032.7U CN219474858U (en) | 2023-03-16 | 2023-03-16 | Force sensor natural frequency measuring device |
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| Publication Number | Publication Date |
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| CN219474858U true CN219474858U (en) | 2023-08-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202320519032.7U Active CN219474858U (en) | 2023-03-16 | 2023-03-16 | Force sensor natural frequency measuring device |
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| CN (1) | CN219474858U (en) |
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- 2023-03-16 CN CN202320519032.7U patent/CN219474858U/en active Active
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