CN214669138U - Novel non-contact rotating shaft rotating speed measuring device - Google Patents
Novel non-contact rotating shaft rotating speed measuring device Download PDFInfo
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- CN214669138U CN214669138U CN202120141228.8U CN202120141228U CN214669138U CN 214669138 U CN214669138 U CN 214669138U CN 202120141228 U CN202120141228 U CN 202120141228U CN 214669138 U CN214669138 U CN 214669138U
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Abstract
The utility model discloses a novel non-contact rotating shaft rotating speed measuring device, which comprises a radial step speed measuring tooth, an eddy current displacement sensor, a signal conditioning module, a data acquisition module and a computer; the radial stepped speed measuring gear is sleeved on a rotating shaft to be measured in speed, the rotating shaft and the radial stepped speed measuring gear rotate together, a plurality of groups of convex parts are arranged on the gear surface of the speed measuring gear, and the top surfaces of the convex parts have height difference; the eddy current displacement sensor is used for detecting a radial distance signal between the probe and the top surface of the boss, and converting the change of the position of the top surface of the boss in the rotation process into the change of the output frequency; the utility model provides a rotation axis rotational speed turns to measuring device based on single eddy current displacement sensor only needs the cascaded unit that tests the speed that the configuration external diameter differs and through data processing, can acquire the rotational speed that awaits measuring the axis body effectively fast and turn to data, device simple structure is compact, and it is convenient to use, low in manufacturing cost is honest and clean, and the installation requirement is low, and the suitability is strong.
Description
Technical Field
The utility model relates to a detecting instrument field, more specifically say, relate to a novel non-contact rotation axis rotational speed measurement device.
Background
The revolving shaft body is an indispensable key component in the industrial society, and the revolving shaft is widely applied to processing production in laboratories, manufacturing plants and research institutions, so that a great demand for accurate measurement of the revolving speed is generated.
The measurement of the rotating speed of the shaft body mainly aims at two major variables of the rotating speed and the rotating direction, and the rotating speed measurement method can be divided into a contact type and a non-contact type according to whether a sensitive element is in mechanical contact with the rotating shaft or not. The common contact type rotating speed measuring device is provided with a photoelectric encoder and a tachogenerator; the common non-contact type rotating speed measuring device is characterized in that a plurality of sensing elements are arranged at different circumferential positions of a measured shaft body, signals output by the sensing elements are connected to controllers such as a PLC (programmable logic controller) or a single chip microcomputer in the rotation process of the shaft body, the rotating speed of the shaft body can be measured by analyzing the frequency of the signal change of the sensing elements, and the rotating direction of the rotating shaft can be judged by comparing the phases of the signals output by the sensing elements.
Although the contact type and non-contact type rotating speed measuring devices are widely applied in the prior art and can effectively measure the rotating speed of the shaft body, the whole structure is still not concise, and certain limitation exists in the use process. For example, contact-type rotating speed measuring devices such as a photoelectric encoder and a tachogenerator are difficult to install, the requirement on the coaxiality between the measuring device and a measured shaft is high, and only two ends of the measured shaft can be installed; the non-contact measuring device adopting a plurality of sensitive elements needs to install a plurality of sensitive elements in the circumferential direction of the measured shaft, has high requirement on installation space, and often cannot provide enough installation space in some occasions; therefore, the technical defects limit the popularization and application of the measuring device.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the problems existing in the prior art, providing a novel non-contact rotating shaft rotating speed measuring device which is simple in structure and convenient to use, so as to overcome the problems of complex structure and complex installation in the prior art.
The utility model discloses above-mentioned purpose is realized through following technical scheme:
a novel non-contact rotating shaft rotating speed measuring device comprises radial step speed measuring teeth, an eddy current displacement sensor, a signal conditioning module, a data acquisition module and a computer; wherein the content of the first and second substances,
the radial stepped speed measuring gear comprises a wheel core and a wheel surface, the radial stepped speed measuring gear is sleeved on a rotating shaft to be measured through the wheel core and coaxially rotates along with the rotating shaft, a plurality of groups of protruding parts are arranged on the wheel surface in an axial arrangement mode, the protruding parts protrude outwards in the radial direction, and the top surfaces of the protruding parts have height difference;
the eddy current displacement sensor is positioned on one side of the wheel surface, and a probe of the eddy current displacement sensor is aligned with the raised part area so as to detect a radial distance signal between the probe and the top surface of the raised part;
the signal conditioning module is connected with the eddy current displacement sensor and used for receiving a radial distance signal detected by the eddy current displacement sensor and conditioning the radial distance signal;
the data acquisition module is connected with the signal conditioning module and used for receiving the conditioned radial distance signals and calculating the conditioned radial distance signals to generate a plurality of radial distance values;
and the computer is connected with the data acquisition module and is used for receiving and analyzing the change of the radial distance value to obtain the revolution speed value of the rotating shaft.
As a further optimization of the present invention, the slew rate value includes slew rate and steering data.
As the utility model discloses a further optimization scheme, the equidistance is provided with a plurality of groups bellying on the wheel face, every group the bellying is including the adjacent teeth of a cogwheel more than two, and is adjacent there is the difference in height between the teeth of a cogwheel.
As the utility model discloses a further optimization scheme, every the flank of tooth is the circular arc setting, the circular arc surface along the axis gyration of the tooth is tested the speed to radial ladder forms.
As a further optimization scheme of the present invention, every the flank of tooth is greater than the detection range of the eddy current displacement sensor probe.
As the utility model discloses a further optimization scheme, radial ladder speed measurement tooth adopts steel to make.
As a further optimization scheme of the utility model, eddy current displacement sensor is high frequency reflection formula sensor.
As a further optimization scheme of the utility model, the signal conditioning module includes:
the signal amplifier is used for amplifying the radial distance signal detected by the eddy current displacement sensor;
and the filter is connected with the signal amplifier and is used for removing noise in the amplified radial spacing signal.
As the utility model discloses a further optimization scheme, the data acquisition module includes:
the A/D converter is connected with the filter and is used for converting the radial distance signal after noise removal into a radial distance digital signal;
the processor is used for receiving the converted radial distance digital signals and performing calculation processing on the radial distance digital signals to generate position change information of the radial step speed measuring teeth;
and the communication interface is connected with the processor and is used for sending the position change information of the radial step speed measuring teeth to the computer.
As a further optimization scheme of the utility model, the data acquisition module still includes the memory, its with the treater is connected for the storage detects data.
To sum up, the utility model utilizes the action principle of electromagnetic induction of the eddy current displacement sensor to detect the position of a conductor, and a radial step speed measurement tooth made of metal is sleeved on the shaft body to be detected, the radial step speed measurement tooth is provided with a plurality of gear teeth with different heights along the radial line direction of the shaft body, namely, a speed measurement surface with different outer diameters similar to steps is additionally arranged on the peripheral surface of the shaft body to be detected; in the process that the shaft body to be measured drives the radial stepped speed measuring teeth to rotate together, the gear teeth also rotate at the same speed, the distance between the gear tooth surface and the sensor probe can change along with the rotation, the change signal shows periodic circulation along with the continuous rotation of the shaft body to be measured, the computer can calculate the rotation speed of the shaft body to be measured by calculating and analyzing the frequency of the occurrence of a certain peak value of the gear teeth, and the steering of the shaft body to be measured can be judged by comparing the change sequence of the frequency signal.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model provides a rotation axis rotational speed turns to measuring device based on single eddy current displacement sensor only needs the cascaded unit that tests the speed that the configuration external diameter differs and through data processing, can acquire the rotational speed that awaits measuring the axis body effectively fast and turn to data.
The utility model relates to a rationally, the structure is simple and clear, low in manufacturing cost is honest and clean, only uses single sensor can realize showing the economic performance who has promoted testing arrangement to the synchronous measurement that the axis body rotational speed that awaits measuring turned to.
Besides, the device can adjust the arrangement density of the speed measuring gear teeth according to the requirement of the test precision, so that the measurement with different precisions is realized, the whole test process is simple, convenient and quick, and the test result is visual and reliable.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic view of the installation of the measuring device of the present invention;
FIG. 2 is a schematic cross-sectional view of a radial stepped tachometer tooth of an embodiment;
FIG. 3 is a schematic diagram of the structure and operation principle of the measuring device of the present invention;
fig. 4 is a schematic diagram of the signal conditioning module according to the present invention;
fig. 5 is a schematic diagram of the data acquisition module of the present invention;
FIG. 6 is a graph showing a theoretical received signal when the shaft body is rotated forward;
FIG. 7 is a graph of theoretical received signal with the measured shaft inverted;
in the figure, 1-axis of rotation; 2-radial step speed measuring teeth; 21-a wheel core; 22-wheel surface; 23-an internally threaded through hole; 24-a boss; 241-gear teeth; 2411-low gear teeth; 2412-middle gear teeth; 2413-high gear teeth; 242-tooth surface; 3-an eddy current displacement sensor; 31-sensor probe.
Detailed Description
The following describes the present invention with reference to the accompanying drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features related to the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Referring to fig. 1, the present embodiment provides a novel non-contact rotating shaft speed measuring device, which includes a radial step speed measuring tooth 2, an eddy current displacement sensor 3, a data collecting instrument and a computer;
referring to fig. 2, the radial stepped speed measurement tooth 2 includes a wheel core 21 and a wheel surface 22, in a preparation stage of a use state, the wheel core 21 needs to be sleeved on the rotating shaft 1 to be measured through clearance fit, then a bolt is screwed into an internal thread through hole 23 preset on the wheel surface 22, the radial stepped speed measurement tooth 2 and the rotating shaft 1 are fastened and connected by using thrust of a bottom surface of the bolt to the peripheral surface of the rotating shaft 1, and therefore the rotating shaft 1 drives the radial stepped speed measurement tooth 2 to rotate together;
the radial stepped speed measuring teeth 2 rotate around the axis of the wheel core 21 to form the wheel surface 22, so that the diameter of each wheel surface 22 is equal, a plurality of groups of stepped bosses 24 are arranged on the wheel surface 22 around the axis, and the bosses 24 protrude outwards along the radial direction; the eddy current displacement sensor 3 is positioned on one side of the wheel surface 22, and a probe 31 of the eddy current displacement sensor 3 is aligned with the boss 24 so as to detect a radial distance signal from the top surface of the boss 24; based on the structure, when the rotating shaft 1 drives the radial stepped speed measuring teeth 2 to rotate, the distance between the sensor probe 31 and the top surface of the boss 24 changes with time, and thus the recorded radial distance signal can show periodic fluctuation.
Specifically, in the present embodiment, each set of the protrusions 24 includes three adjacent gear teeth 241, the gear teeth 241 are arranged along the circumferential direction of the wheel surface 22, and the heights of the three adjacent gear teeth 241 are gradually decreased, so that each set of the protrusions 24 forms a stepped tooth surface 242 extending in a certain direction on the wheel surface 22; the position of the sensor probe 31 is always fixed, and in the rotation process of the rotating shaft 1, the sensor probe 31 faces the tooth surfaces 242 with different heights on the wheel surface 22, so that different radial distance signals are detected, and the rotating speed and steering data of the rotating shaft 1 can be obtained by collecting and analyzing the radial distance signals which change periodically.
Of course, in other embodiments, the relative height difference and the height sequence of the gear teeth 241 do not need to be rigidly defined, and the shape of the gear teeth 241 may even be made into a concave-convex surface similar to a ratchet wheel or other regular changes, so long as the tooth surface 242 can form a periodic fluctuating interval change with the sensor probe 31 in the rotation process, which can be used as the technical solution of the present invention.
However, no matter what specific shape is adopted for the gear tooth 241, each tooth surface 242 should be larger than the detection range of the sensor probe 31 to ensure that each detected radial distance signal can be stably output, so as to form a periodic variation rule with the same trend, so as to facilitate the processing and analysis of subsequent data.
Further, the number of the gear teeth 241 can be determined according to the actually required measurement accuracy, and the more the number of the gear teeth is, or the higher the arrangement density of the convex portions 24 is, the higher the accuracy of the detection value is.
Of course, it should be understood that, based on the working principle of the eddy current displacement sensor 3, the bolt used for installing the radial stepped speed measurement tooth 2 should be a countersunk bolt so as to prevent the bolt from forming an additional convex surface on the wheel surface 22 after being screwed down, and causing unnecessary interference to the radial distance signal required to be detected by the sensor.
In the speed measurement operation process, the radial distance signals detected by the eddy current displacement sensor 3 need to be processed by the data acquisition instrument and then sent to the computer for analysis, so that the rotating speed and the steering data can be obtained through conversion.
Specifically, referring to fig. 3 to 5, the data acquisition instrument is integrated with a signal conditioning module and a data acquisition module; the signal conditioning module is connected with the eddy current displacement sensor and used for receiving a radial distance signal detected by the eddy current displacement sensor, amplifying and filtering the radial distance signal; the data acquisition module is connected with the signal conditioning module and used for acquiring the conditioned radial distance signals and performing A/D conversion on the conditioned radial distance signals to generate position change information of the radial step speed measuring teeth, and the data acquisition module has a storage function and stores and records a measurement result; and the data acquisition module is also provided with a communication interface for sending the position change information of the radial step speed measurement teeth to the computer.
In the embodiment, the eddy current displacement sensor 3 adopts a digital eddy current displacement sensor EX-V series of Keynes corporation, brass is adopted as a magnetic ring shell material, stainless steel is adopted as a pipe body material, a PUR material is adopted for a cable part, and various factors are combined to be beneficial to enhancing the environment adaptability of the sensor; the mating of the copper contact also helps to exhibit significant crush resistance.
In this embodiment, the data acquisition instrument selects the zhongtai scientific research creative MP421 type data acquisition instrument, the data acquisition instrument performs a/D conversion on the conditioned signal, and then sends the obtained digitized voltage signal to the computer through the communication interface.
The working process of the speed measuring device is briefly described as follows:
(1) fixing the radial stepped speed measurement tooth 2 on a measured rotating shaft 1, installing an eddy current displacement sensor 3 to a proper position and debugging to ensure that a sensor probe 31 is aligned with the peripheral surface of the radial stepped speed measurement tooth 2;
(2) starting a rotating shaft 1, driving a radial stepped speed measuring tooth 2 to rotate together, acquiring an output signal of an eddy current displacement sensor by a data acquisition instrument, conditioning and converting the signal into a digital voltage signal and sending the digital voltage signal to a computer;
(3) the computer receives and analyzes the digitized voltage signal, and draws and displays a pulse change curve of the sensor in real time;
(4) and the computer analyzes and processes the data of the pulse curve through an internal counting and direction-distinguishing algorithm to obtain the rotating speed and steering data of the measured rotating shaft 1.
For further discussion of the operation principle of the present device, the present embodiment takes a radial gear with three steps as an example, as shown in fig. 2, 4 sets of protrusions 24 are uniformly disposed on the face 22 of the radial stepped speed measurement gear 2, each set of protrusions 24 is provided with 3 gear teeth 241 with increasing height, which can be understood as a low gear tooth 2411, a middle gear tooth 2412 and a high gear tooth 2413, respectively, the diameter of the low gear tooth 2411 is the same as the diameter of the face 22, and the diameter of the middle gear tooth 2412 is between the low gear tooth 2411 and the high gear tooth 2413;
in the pulse width range of the eddy current displacement sensor 3, the radial step speed measuring tooth 2 rotates forward more than one turn, the eddy current displacement sensor 3 respectively detects the distance between the tooth 241 of the gear with different height, the change of the measured distance is converted into the change of the self-inductance of the inner coil, the change is converted into the change of the output frequency through the inner measuring circuit, the frequency is directly measured by a computer, so as to obtain a frequency signal change curve chart shown in fig. 6, because the tooth 241 of the radial step speed measuring tooth 2 is arranged in a step mode, step signals can appear when the sensor collects signals, and the trends of the step signals can be different when the direction is not changed (as shown in fig. 7), the rotating speed value of the measured rotating shaft 1 can be obtained by calculating and analyzing the interval duration of every two sections of pulse waves in the curve and the setting number of the convex parts 24, according to the change rule of the peak value in the curve, the actual steering of the measured rotary shaft 1 can be determined.
The hardware part of the device mainly comprises a single eddy current displacement sensor and radial stepped speed measuring teeth, can simultaneously measure the rotation rate and the rotation direction of the measured shaft body, and has the advantages of simple and compact structure, convenience in use, low manufacturing cost, low installation requirement and strong applicability.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in the embodiments without departing from the principles and spirit of the invention, and the scope of the invention is to be accorded the full scope of the claims.
Claims (10)
1. The utility model provides a novel non-contact rotation axis rotational speed measurement device which characterized in that: the eddy current displacement sensor is used for measuring the eddy current displacement of the rotor and comprises a radial step speed measuring tooth, an eddy current displacement sensor, a signal conditioning module, a data acquisition module and a computer; wherein the content of the first and second substances,
the radial stepped speed measuring gear comprises a wheel core and a wheel surface, the radial stepped speed measuring gear is sleeved on a rotating shaft to be measured through the wheel core and coaxially rotates along with the rotating shaft, a plurality of groups of protruding parts are arranged on the wheel surface in an axial arrangement mode, the protruding parts protrude outwards in the radial direction, and the top surfaces of the protruding parts have height difference;
the eddy current displacement sensor is positioned on one side of the wheel surface, and a probe of the eddy current displacement sensor is aligned with the raised part area so as to detect a radial distance signal between the probe and the top surface of the raised part;
the signal conditioning module is connected with the eddy current displacement sensor and used for receiving a radial distance signal detected by the eddy current displacement sensor and conditioning the radial distance signal;
the data acquisition module is connected with the signal conditioning module and used for receiving the conditioned radial distance signals and calculating the conditioned radial distance signals to generate a plurality of radial distance values;
and the computer is connected with the data acquisition module and is used for receiving and analyzing the change of the radial distance value to obtain the revolution speed value of the rotating shaft.
2. The novel non-contact rotating shaft rotating speed measuring device according to claim 1, characterized in that: the slew speed values include turn rate and steering data.
3. The novel non-contact rotating shaft rotating speed measuring device according to claim 1, characterized in that: the equidistance is provided with a plurality of groups of bellyings on the wheel face, every group the bellyings are including the adjacent teeth of a cogwheel more than two, and are adjacent there is the difference in height between the teeth of a cogwheel.
4. The novel non-contact rotating shaft rotating speed measuring device according to claim 3, characterized in that: the tooth surface of each gear tooth is arranged in an arc shape, and the arc surface is formed by rotating along the axis of the radial stepped speed measuring gear.
5. The novel non-contact rotating shaft rotating speed measuring device according to claim 4, wherein: each tooth surface is larger than the detection range of the probe of the eddy current displacement sensor.
6. The novel non-contact rotating shaft rotating speed measuring device according to claim 5, wherein: the radial step speed measuring teeth are made of steel.
7. The novel non-contact rotating shaft rotating speed measuring device according to claim 5, wherein: the eddy current displacement sensor is a high-frequency reflection type sensor.
8. The novel non-contact rotating shaft rotating speed measuring device according to claim 1, characterized in that: the signal conditioning module comprises:
the signal amplifier is used for amplifying the radial distance signal detected by the eddy current displacement sensor;
and the filter is connected with the signal amplifier and is used for removing noise in the amplified radial spacing signal.
9. The novel non-contact rotating shaft rotating speed measuring device according to claim 8, characterized in that: the data acquisition module comprises:
the A/D converter is connected with the filter and is used for converting the radial distance signal after noise removal into a radial distance digital signal;
the processor is used for receiving the converted radial distance digital signals and performing calculation processing on the radial distance digital signals to generate position change information of the radial step speed measuring teeth;
and the communication interface is connected with the processor and is used for sending the position change information of the radial step speed measuring teeth to the computer.
10. The novel non-contact rotating shaft rotating speed measuring device according to claim 9, characterized in that: the data acquisition module further comprises a memory, which is connected with the processor and used for storing the detection data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120141228.8U CN214669138U (en) | 2021-01-19 | 2021-01-19 | Novel non-contact rotating shaft rotating speed measuring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120141228.8U CN214669138U (en) | 2021-01-19 | 2021-01-19 | Novel non-contact rotating shaft rotating speed measuring device |
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| CN214669138U true CN214669138U (en) | 2021-11-09 |
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| CN202120141228.8U Active CN214669138U (en) | 2021-01-19 | 2021-01-19 | Novel non-contact rotating shaft rotating speed measuring device |
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- 2021-01-19 CN CN202120141228.8U patent/CN214669138U/en active Active
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