CN113866042A - Loading frequency calibration method and device of axial dynamic fatigue testing machine - Google Patents
Loading frequency calibration method and device of axial dynamic fatigue testing machine Download PDFInfo
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Abstract
The embodiment of the invention provides a method and a device for calibrating loading frequency of an axial dynamic fatigue testing machine, wherein the method for calibrating the loading frequency comprises the steps of arranging a reflector at a preset position of a jaw of the axial dynamic fatigue testing machine; the photoelectric tachometer is arranged at one side of the axial dynamic fatigue testing machine and at a position opposite to the reflecting piece, so that light rays emitted by the photoelectric tachometer are projected to the central position of the reflecting piece; and starting the axial dynamic fatigue testing machine, and setting the loading frequency as a frequency value to be calibrated. The loading frequency calibration method utilizes the photoelectric tachometer and the light reflecting piece arranged at the preset position of the jaw of the axial dynamic fatigue testing machine, can accurately measure the loading frequency without directly contacting the jaw of the axial dynamic fatigue testing machine with measuring equipment and personnel, solves the problem of potential safety hazard in the existing loading frequency calibration method, and can accurately measure and calibrate the frequency as low as 1 Hz.
Description
Technical Field
The invention relates to the technical field of dynamic fatigue tests in mechanical property detection, in particular to a method and a device for calibrating loading frequency of an axial dynamic fatigue testing machine.
Background
Under the repeated action of load, a component parent metal, a connection defect or a stress concentration part form a fine fatigue crack, the phenomenon that the fine fatigue crack is further expanded until the component parent metal, the connection defect or the stress concentration part is finally broken is called fatigue failure, the fine fatigue crack is the most common failure mode of materials, any material can be subjected to fatigue failure, many product standards in China require a fatigue test to be used as an important index for product delivery and site acceptance, and therefore, the fatigue testing machine is increasingly applied in the domestic detection industry, wherein the axial fatigue testing machine is most widely applied. To ensure the accuracy of the data detection of the fatigue test, the fatigue test needs to be measured and traced regularly (usually 1 time/year).
The loading frequency in the fatigue test is a main factor influencing the fatigue life, so the frequency of fatigue is specified in many product standards, for example, the frequency of the fatigue test is specified to be 4Hz in TB/T3122-2019 railway sound barrier acoustic construction, and the circulation frequency of the steel strand is not more than 20Hz in GB/T21839-2019 prestressed concrete steel material test method. For materials with poor heat conductivity (such as plastics), the loading frequency has a particularly great influence on fatigue tests, and due to stress hysteresis, partial mechanical energy is converted into heat energy in the test process, so that the temperature of the materials with poor heat conductivity is rapidly increased, and thermal fatigue (a main cause of fatigue damage of the materials with poor heat conductivity) is generated. However, the national metrological verification rule jjjg 556 and 2011 "verification rule for axial loading dynamic fatigue testing machine" only provides the calibration/verification of parameters such as static force, dynamic force, coaxiality and the like of the axial fatigue testing machine, and lacks the provision of frequency calibration.
The existing frequency measuring method mainly adopts a contact type frequency meter for measuring, a calibrator needs to hold the frequency meter and contact a measuring probe with a jaw of a tester during measurement, an output shaft and a measured motion shaft are required to keep the same straight line as much as possible (part of an axial dynamic fatigue testing machine cannot meet the requirements), then the tester is started for measuring, however, a pull/pressure in ton is generated during the operation of the axial dynamic fatigue testing machine, the calibrator is in danger at all times according to the measurement of the method, the initial point of the measurement range of a common frequency meter on the market is 10Hz, and the frequency below 10Hz cannot be accurately measured, so the existing frequency measuring method is not suitable for calibrating the loading frequency of the axial dynamic fatigue testing machine.
Disclosure of Invention
In order to solve the technical problem, the embodiment of the invention provides a loading frequency calibration method of an axial dynamic fatigue testing machine, which does not need to contact a jaw of the testing machine, and improves the safety of calibration personnel. The loading frequency calibration device of the axial dynamic fatigue testing machine is simple in structure and convenient to operate.
On one hand, the embodiment of the invention provides a loading frequency calibration method of an axial dynamic fatigue testing machine, which comprises the following steps:
arranging a light reflecting piece at a preset position of a jaw of the axial dynamic fatigue testing machine;
arranging a photoelectric tachometer at one side of the axial dynamic fatigue testing machine and at a position opposite to the reflecting piece, so that light rays emitted by the photoelectric tachometer are projected to the central position of the reflecting piece;
and starting the axial dynamic fatigue testing machine, and setting the loading frequency as a frequency value to be calibrated.
On the other hand, an embodiment of the present invention further provides a loading frequency calibration apparatus for an axial dynamic fatigue testing machine, including:
the light reflecting piece is arranged at a preset position of a jaw of the axial dynamic fatigue testing machine; and the number of the first and second groups,
and the photoelectric tachometer is arranged at one side of the axial dynamic fatigue testing machine and opposite to the reflecting piece, so that light rays emitted by the photoelectric tachometer are projected to the central position of the reflecting piece.
According to the loading frequency calibration method provided by the embodiment of the invention, the loading frequency can be accurately measured by utilizing the photoelectric tachometer and the light reflecting piece arranged at the preset position of the jaw of the axial dynamic fatigue testing machine without directly contacting the jaw of the axial dynamic fatigue testing machine with measuring equipment and personnel, so that the problem of serious potential safety hazard existing in the conventional loading frequency calibration method is solved, and the photoelectric tachometer can accurately measure and calibrate the frequency as low as 1 Hz. The loading frequency calibration device comprises a reflecting piece and a photoelectric tachometer, the reflecting piece is arranged at a preset position of a jaw, the photoelectric tachometer is arranged at a position opposite to the reflecting piece on one side of the axial dynamic fatigue testing machine, the photoelectric tachometer is adjusted to enable light emitted by the photoelectric tachometer to be projected to the central position of the reflecting piece, and the calibration device is simple in structure and convenient to operate.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the principles of the embodiments of the invention.
FIG. 1 is a schematic diagram illustrating a measurement principle of a calibration apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a calibration fixture in the calibration apparatus according to the embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a tachometer holding apparatus in a calibration apparatus according to an embodiment of the present invention;
fig. 4 is a schematic view of a connection structure between a lifting rod and a base in the calibration device according to the embodiment of the invention.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and the following description. It should be understood that the detailed description and specific examples, while indicating the embodiments of the invention, are given by way of illustration only. It should be noted that, for convenience of description, only the portions related to the embodiments of the present invention are shown in the drawings.
It should be noted that, in the embodiments of the present invention, features in the embodiments may be combined with each other without conflict. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
It should be noted that, the step numbers in the text are only for convenience of explanation of the specific embodiments, and do not serve to limit the execution sequence of the steps.
The embodiment of the invention provides a safe, non-contact, low-cost and convenient-to-operate method and device for calibrating the circulating frequency of an axial dynamic fatigue testing machine.
The axial dynamic fatigue testing machine mainly performs a tensile-compressive fatigue test. The part to be measured is clamped and fixed through the jaw, and axial tension and pressure are alternately applied to the part to be measured through the jaw according to the set loading frequency. Axial position variation, namely axial vibration, consistent with the loading frequency is generated at the jaw, and the measured axial position variation frequency at the jaw is the loading frequency of the tension-pressure. The common range of the loading frequency of the axial dynamic fatigue testing machine is 1Hz-20Hz, the measurement lower limit of a frequency meter commonly used in the market is usually 10Hz, and the requirement of the calibration range of the loading frequency of the axial dynamic fatigue testing machine cannot be met.
The loading frequency calibration method of the axial dynamic fatigue testing machine is used for calibrating the loading frequency of a jaw of the axial dynamic fatigue testing machine, a measurement schematic diagram is shown in figure 1, and the method comprises the following steps:
and S10, arranging a light reflecting piece at the preset position 5 of the jaw of the axial dynamic fatigue testing machine. The reflective member may be made of a reflective material, such as a reflective film, and the reflective film is attached to the predetermined position of the nip.
And S20, arranging the photoelectric tachometer at one side of the axial dynamic fatigue testing machine and at a position opposite to the reflecting piece, so that the light emitted by the photoelectric tachometer is projected at the central position of the reflecting piece. The photoelectric tachometer is prior art and comprises a light source 1, lenses 2, 4, 6, a translucent film 3 and a photoelectric cell 7. The working principle is as follows: the revolution meter emits a light source with a certain wavelength, when the light source irradiates the reflective material, the receiver receives the light beam reflected by the reflective coating and converts the light signal into an electric signal, and the frequency of the light source irradiating the reflective material is the revolution speed. That is, the conventional application of the photoelectric tachometer in the art is to measure the rotational speed, and the jaw of the axial dynamic fatigue tester makes axial displacement variation (axial vibration), as shown by the arrow direction in fig. 1, which changes the axial rotation position variation into the axial vibration position variation compared with the axial rotation, so that the measurement principle of the photoelectric tachometer can be used to measure the axial vibration loading frequency of the axial dynamic fatigue tester. In addition, the lower measurement limit of the revolution meter can reach 1Hz, and the use requirement can be well met.
S30, starting the axial dynamic fatigue testing machine, and setting the loading frequency as a frequency value needing to be calibrated, namely a calibration frequency point; frequency values can be as low as 1 Hz. Generally, calibration is performed from low frequency to high frequency, 3 times of measurement is repeated for each frequency point, 3 times of average value is taken as a measurement value, and a value error of each calibration point is calculated.
The loading frequency calibration method of the embodiment utilizes the working principle of the photoelectric tachometer, and the calibrator can accurately measure the loading frequency of the jaw without directly contacting the jaw of the tester, so that the safety of the calibrator is improved, and errors caused by manual operation are reduced. And meanwhile, the frequency as low as 1Hz can be calibrated, and the use requirement is met.
In one embodiment of the present invention, the distance between the light exit opening of the photoelectric tachometer and the plane on which the light reflecting member is located is preferably 50mm to 200 mm.
In one implementation of the embodiment of the present invention, step S20 includes:
s21, arranging a calibration tool for clamping the photoelectric tachometer on one side of the axial dynamic fatigue testing machine, and installing the photoelectric tachometer on the calibration tool.
And S22, adjusting the height and the clamping angle of the photoelectric tachometer through the calibration tool, so that the light emitted by the photoelectric tachometer is projected to the central position of the light reflecting piece.
Through using the calibration frock, conveniently hold the stable interpolation of photoelectric tachometer to nimble regulation increases the adaptability.
In another aspect of the embodiments of the present invention, referring to fig. 1 to 4, a loading frequency calibration apparatus for an axial dynamic fatigue testing machine is provided, which is corresponding to the above loading frequency calibration method, and is used for calibrating the loading frequency of the axial dynamic fatigue testing machine, and includes a light reflecting member and a photoelectric tachometer. The reflector is used for being arranged at a preset position 5 of a jaw of the axial dynamic fatigue testing machine. The device can be made of a reflective material, such as a reflective film, and the reflective film is attached to a specified position of the jaw during calibration measurement. The photoelectric tachometer is arranged on one side of the axial dynamic fatigue testing machine and opposite to the reflecting piece, so that light emitted by the photoelectric tachometer is projected to the central position of the reflecting piece.
The loading frequency calibration device of this embodiment has utilized the theory of operation of photoelectric tachometer, and cooperation reflectors such as reflective membrane only need paste the assigned position of keeping silent with the reflective membrane when measuring the calibration, and it is relative with the reflector position to set up the photoelectric tachometer in axial dynamic fatigue testing machine one side, and the adjustment photoelectric tachometer makes the light of its transmission throw the central point that can begin the calibration measurement in the reflector, simple structure, convenient operation.
Further, the calibration device further comprises a calibration tool 10 for clamping the photoelectric tachometer, and as shown in fig. 2, the calibration tool 10 comprises a base 11, a lifting rod, and a tachometer clamping device 12. The base 11 may be made of a metal material to support the entire calibration fixture. One end of the lifting rod is fixed on the base 11. The lifting rod can be used for adjusting the height of the photoelectric tachometer by stretching and retracting. The tachometer clamping device 12 is connected with the other end of the lifting rod through a rotary connecting structure. The tachometer clamping device 12 is used for clamping and adjusting the clamping angle of the photoelectric tachometer. Through this calibration frock, can stably install the photoelectric tachometer to can adjust the photoelectric tachometer in height and angle two aspects.
Further, the lift lever includes a first pin 13, a second pin 14, and a third pin 15. The three rod pieces are sequentially sleeved and can be adjusted in a telescopic mode. The first pin 13 and the second pin 14 have a hollow cylindrical shape. One end of the first rod 13 is fixed to the base 11, and referring to fig. 4, may be fixedly connected to the metal base 11 by four connecting bolts 17. The second rod 14 is slidably coaxially inserted in the first rod 13, and the first rod 13 is provided with a first adjusting hand wheel 16 for locking or unlocking the second rod 14. The third rod 15 is slidably inserted coaxially in the second rod, the second rod 14 being provided with a second adjusting hand wheel 16 for locking or unlocking the third rod 15. One end of the third rod 15 is connected with the tachometer clamping device 12 through a rotary connection structure.
The first adjusting hand wheel 16 and the second adjusting hand wheel 16 have the same structure, and the bolts are screwed into the threaded through holes formed in the side walls of the first rod piece 13 and the second rod piece 14, and are rotated by the hand wheels fixed to one ends of the bolts, so that the other ends of the bolts prop against or loosen the second rod piece 14 and the third rod piece 15, and the height of the revolution meter can be adjusted in the vertical direction.
Optionally, the rotation connection structure adopts a spherical hinge connection structure 18, so that the revolution meter can rotate in 360 degrees in the horizontal direction and 90 degrees in the vertical direction, the applicability of the calibration device is improved, and all parts of the calibration device can be detached, so that the calibration device is convenient to transport and store.
Alternatively, referring to fig. 3, the tachometer clamping device 12 includes a carrier plate 121 and a clamping block 122. The bearing plate 121 is connected with the rotary connecting structure; the clamping blocks 122 are arranged in pairs, each clamping block 122 is slidably connected with the bearing plate 121, and a spring 123 is arranged between each clamping block 122 and the bearing plate 121. The photoelectric tachometer is disposed on the bearing plate 121 and is held and fixed by the holding block 122. For example, the bearing plate 121 is provided with two pairs of clamping blocks 122, each pair of clamping blocks 122 is respectively disposed on two opposite sides of the bearing plate 121, and totally comprises 4 clamping blocks 122, and the clamping blocks are symmetrically distributed on two sides of the bearing plate 121, and respectively transversely clamp the photoelectric tachometer through 4 sliding clamping blocks 122, so that stability of the photoelectric tachometer during clamping is ensured, and the photoelectric tachometer is suitable for photoelectric tachometers of different types.
In conclusion, the loading frequency calibration method of the invention adopts non-contact calibration, thereby ensuring personnel safety and reducing errors caused by manual operation.
The measurement lower limit of a frequency meter commonly used in the market is usually 10Hz, and the requirement of the calibration range of the frequency of the axial dynamic fatigue testing machine cannot be met (1Hz-20Hz is the frequency common range of the axial dynamic fatigue testing machine), while the measurement lower limit of the photoelectric tachometer adopted by the invention can reach 1Hz, and the use requirement can be well met.
The height of the bearing plate 121 can be adjusted through the lifting rod and the hand wheel by adopting a special calibration tool, the stability of the photoelectric tachometer during clamping is ensured by the 4 sliding clamping blocks 122, the tachometer can rotate in 360 degrees in the horizontal direction and 90 degrees in the vertical direction, the applicability is good, and the calibration device is convenient and easy to disassemble and is easy to store and transport.
The calibration method and the calibration device of the invention are subjected to stability assessment, repeatability tests, measurement uncertainty assessment and calibration result verification according to JJF 1033-.
1. Stability assessment
And (3) performing stability assessment on the calibration method, selecting a dynamic fatigue testing machine with the specification model of SDS50, setting the frequency to be 5Hz, performing stability test every 10 days, and performing stability analysis on the calibration method according to the measurement result, wherein the measurement result is shown in Table 1.
TABLE 1 stability assessment data
Difference value between maximum value and minimum value in measurement result of stability assessment
rpm, converted to a frequency of 1.36 ÷ 60 ═ 0.02 Hz. The result is less than the maximum allowable error of 0.03Hz expected by the standard device, namely the stability of the calibration method is satisfactory.
2. Repeatability test
The calibration method is subjected to repeatability tests, another dynamic fatigue testing machine with the specification model of SDS100 is selected, the frequency is set to be 10Hz, 10 times of measurement are carried out under the repeatability condition, and the measurement results are shown in Table 2.
The repeatability of the calibration method was calculated using equation (1).
Then s (y)i)＝1.111rpm＝0.019Hz
In the formula: y isi-the result of each measurement, rpm;
n-number of measurements;
s(yi) Experimental standard deviation, rpm, of a single measurement.
The repeatability test result shows that the method has better repeatability.
TABLE 2 repeatability measurements
3. Measurement uncertainty assessment of calibration results
3.1 mathematical model
Δ＝HIs provided with-HMeasuring (2)
In the formula: the frequency indication error of the delta-axial dynamic fatigue testing machine is Hz;
His provided with-axial dynamic fatigue tester frequency setpoint, Hz;
HmeasuringAxial dynamic fatigue tester frequency found value, Hz.
3.2 measurement of uncertainty origin analysis
The factors influencing the frequency measurement result of the axial dynamic fatigue testing machine mainly comprise: firstly, the uncertainty introduced by the part can be evaluated through repeated measurement due to the influence of personnel operation, tool erection and the like; and the assignment of the revolution table does not lead to uncertainty.
3.3 Standard uncertainty u assessed by repeated measurementsA
The measurement was performed on a 10Hz calibration point of an SDS100 type dynamic fatigue tester, and 10 repeated measurements were performed under the same conditions. The standard uncertainty introduced by this component is assessed in a class a method. The results obtained are as described above.
During actual measurement, the average value of 3 measurements is taken as the frequency measurement result, and the following results are obtained:
3.4 Standard uncertainty u introduced by tachometerB
The uncertainty introduced by a revolution meter adopted in the frequency calibration of the axial dynamic fatigue testing machine is evaluated according to a B-type method, and a standard uncertainty component u introduced by the uncertainty is calculatedBThe calculation method is shown in formula (3).
In the formula: u-uncertainty of indication values of corresponding measuring points of the tachometer;
the k-speed represents the inclusion factor used in the value uncertainty evaluation.
The actually configured tachometer calibration result shows the uncertainty U of the tachometer calibration resultrel0.06% (k 2), i.e., 0.36rpm 0.006Hz (k 2), then
3.5 uncertainty of synthetic Standard
Influence factors of uncertainty of the intelligent tensioning system elongation value calibration result are irrelevant, so that the synthetic standard uncertainty is calculated according to the formula (4), and the synthetic standard uncertainty of a 10Hz measuring point is obtained as follows:
namely, it is
3.6, extended uncertainty
Assuming that the measurement result obeys normal distribution, and the inclusion factor k is 2, the extended uncertainty U is calculated according to the following formula, and the result of the synthesized standard uncertainty is substituted to obtain the extended uncertainty of the calibration result:
U＝2×0.012Hz＝0.03Hz，k＝2
4. conclusion of the calibration method
From the verification process, the calibration method has high stability and good repeatability, the expansion uncertainty of the calibration result obtained by the method is 0.03Hz, and the conversion rate of the expansion uncertainty into the relative expansion uncertainty is only 0.3%, so that the method has good magnitude transmission reliability, and the blank of the frequency calibration method of the axial dynamic fatigue testing machine is filled well.
In the description herein, reference to the description of the terms "one embodiment/mode," "some embodiments/modes," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/mode or example is included in at least one embodiment/mode or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to be the same embodiment/mode or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/aspects or examples and features of the various embodiments/aspects or examples described in this specification can be combined and combined by one skilled in the art without conflicting therewith.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the embodiments of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise. Meanwhile, in the description of the embodiments of the present invention, unless explicitly specified or limited otherwise, the terms "connected" and "connected" should be interpreted broadly, for example, as being fixedly connected, detachably connected, or integrally connected; the connection can be mechanical connection or electrical connection; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.
It should be understood by those skilled in the art that the foregoing embodiments are merely for illustrating the embodiments of the present invention clearly and are not intended to limit the scope of the embodiments of the present invention. Other variations or modifications will occur to those skilled in the art based on the foregoing disclosure and are within the scope of the embodiments of the invention.
Claims (8)
1. A loading frequency calibration method of an axial dynamic fatigue testing machine is characterized by comprising the following steps:
arranging a light reflecting piece at a preset position of a jaw of the axial dynamic fatigue testing machine;
arranging a photoelectric tachometer at one side of the axial dynamic fatigue testing machine and at a position opposite to the reflecting piece, so that light rays emitted by the photoelectric tachometer are projected to the central position of the reflecting piece;
and starting the axial dynamic fatigue testing machine, and setting the loading frequency as a frequency value to be calibrated.
2. The method for calibrating a loading frequency according to claim 1, wherein the distance between the light exit opening of the optoelectronic tachometer and the plane of the reflector is preferably 50mm to 200 mm.
3. The method for calibrating the loading frequency according to claim 1, wherein the positioning of the optoelectronic tachometer on a side of the axial dynamic fatigue tester opposite to the reflector such that the light emitted from the optoelectronic tachometer is projected to a central position of the reflector comprises:
arranging a calibration tool for clamping the photoelectric tachometer on one side of the axial dynamic fatigue testing machine, and mounting the photoelectric tachometer on the calibration tool;
the height and the clamping angle of the photoelectric tachometer are adjusted through the calibration tool, so that light emitted by the photoelectric tachometer is projected to the central position of the reflecting piece.
4. The utility model provides an axial dynamic fatigue testing machine's loading frequency calibrating device which characterized in that includes:
the light reflecting piece is arranged at a preset position of a jaw of the axial dynamic fatigue testing machine; and the number of the first and second groups,
and the photoelectric tachometer is arranged at one side of the axial dynamic fatigue testing machine and opposite to the reflecting piece, so that light rays emitted by the photoelectric tachometer are projected to the central position of the reflecting piece.
5. The loading frequency calibration device of claim 4, further comprising a calibration fixture for clamping the optoelectronic tachometer, the calibration fixture comprising:
a base;
one end of the lifting rod is fixed on the base; and the number of the first and second groups,
the tachometer clamping device is connected with the other end of the lifting rod through a rotary connecting structure;
the lifting rod is used for adjusting the height of the photoelectric tachometer, and the tachometer clamping device is used for clamping and adjusting the clamping angle of the photoelectric tachometer.
6. The loading frequency calibration device of claim 5, wherein the lifter comprises a first bar, a second bar, and a third bar; one end of the first rod piece is fixed on the base, the second rod piece is slidably and coaxially inserted into the first rod piece, and the first rod piece is provided with a first adjusting hand wheel for locking or loosening the second rod piece;
the third rod piece is slidably and coaxially inserted into the second rod, and the second rod piece is provided with a second adjusting hand wheel for locking or loosening the third rod piece; one end of the third rod piece is connected with the tachometer clamping device through the rotary connecting structure.
7. The loading frequency calibration device of claim 5 or 6, wherein the rotational connection structure is a ball-and-socket joint structure.
8. The loading frequency calibration device of claim 5 or 6, wherein the tachometer holding device comprises a bearing plate, a holding block; the bearing plate is connected with the rotary connecting structure; the clamping blocks are arranged in pairs, each clamping block is connected with the bearing plate in a sliding mode, and a spring is arranged between each clamping block and the corresponding bearing plate;
the photoelectric tachometer is arranged on the bearing plate and is fixedly clamped by the clamping block.
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