CN115560907A - Calibration device for thrust balance - Google Patents
Calibration device for thrust balance Download PDFInfo
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- CN115560907A CN115560907A CN202211063925.1A CN202211063925A CN115560907A CN 115560907 A CN115560907 A CN 115560907A CN 202211063925 A CN202211063925 A CN 202211063925A CN 115560907 A CN115560907 A CN 115560907A
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- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L25/00—Testing or calibrating of apparatus for measuring force, torque, work, mechanical power, or mechanical efficiency
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Abstract
A calibration device for a thrust balance comprises a top support cross frame and a left support frame and a right support frame which are connected with the two ends of the top support cross frame respectively, wherein a flange connecting piece, the thrust balance, an intermediate shaft and a propeller are sequentially connected with the lower part of the top support cross frame, a pulley frame is connected with the top support cross frame on one side of the propeller, a pulley piece is movably connected with the pulley frame, one end of a steel cable is fixedly connected with the center of the side surface of one side of the propeller, the other end of the steel cable is fixedly connected with a weight frame in a downward extending mode after the direction of the other end of the steel cable is changed after passing through the circumferential surface of the pulley piece, weights are arranged in the weight frame, the steel cable between the propeller and the pulley piece is parallel to the top support cross frame, and the steel cable between the pulley piece and the weight frame is perpendicular to the top support cross frame; when the calibration device is used, the thrust balance and the propeller can be replaced, and under the action of a unilateral force, the thrust balance is stressed constantly, so that the accuracy and the stability of the calibration device are improved. Therefore, the design has the advantages of wide application range and high calibration precision and stability.
Description
Technical Field
The invention relates to a propeller calibration device, belongs to the field of ship power, and particularly relates to a calibration device for a thrust balance.
Background
In a rim propeller product test, a thrust balance device is generally used, which is mainly used to measure the thrust generated by the rim propeller device under the rated power, and is affected by the structure of the rim propeller product, when measuring the thrust, the thrust balance device is connected to the flange direction of the rim propeller, and forms an angle of 90 ° with the thrust direction generated by the rim propeller, so as to form a cantilever structure, when measuring the thrust, the thrust balance cannot directly measure the thrust of the rim propeller, and generates a bending moment on the thrust balance by the thrust of the propeller, and the thrust is calculated by the corresponding relationship between the bending moment displacement and the strain, because the size, the structure and the installation form of the rim propeller are different, the installation position distance of the thrust balance is different from the thrust center of the propeller, therefore, in order to accurately measure the thrust generated under the rated power of the rim propeller, before performing the product test at every time, the thrust balance device needs to be calibrated, so that the thrust balance device can meet the requirement of rim propeller thrust measurement, in the prior art, the application number is: CN202010750750.6, name: helicopter wind tunnel test platform balance rotation calibration loading device, the application date is: a similar calibration work is possible with devices using multi-lateral tension, as disclosed in the patent document at 30/7/2020, but they have the following drawbacks:
the calibration device can only be used singly, is manufactured independently according to the models of the propeller and the thrust balance, cannot be matched with the propeller and the thrust balance which are suitable for different purposes, has narrow application range, causes unbalanced stress of the thrust balance due to multi-lateral tension, and has low calibration precision and stability.
The information disclosed in this background section is only for enhancement of understanding of the general background of the application and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to overcome the defects and problems of narrow application range and low calibration precision and stability of a calibration device in the prior art, and provides the calibration device for the thrust balance, which has the advantages of wide application range and high calibration precision and stability.
In order to achieve the above purpose, the technical solution of the invention is as follows: a calibration device for a thrust balance, the thrust balance calibration device comprising: the left support frame, the right support frame and the top support cross frame; one end of the top support cross frame is fixedly connected with the top end of the left support frame, and the other end of the top support cross frame is fixedly connected with the top end of the right support frame; the top surface of the middle part of the top support cross frame is connected with the top end of a flange connecting piece through a first bolt, the bottom end of the flange connecting piece is connected with the top end of a thrust balance through a second bolt, the bottom end of the thrust balance is connected with the top end of an intermediate shaft through a third bolt, and the bottom end of the intermediate shaft is connected with the top end of a propeller through a fourth bolt; the bottom surface of the top support transverse frame is fixedly connected with a pulley yoke through a fifth bolt, the pulley yoke is positioned on one side of the propeller, and the bottom end of the pulley yoke is movably connected with a pulley piece; one end of a steel cable is fixedly connected to the center of the side face of one side of the propeller, the other end of the steel cable extends downwards after changing the direction after passing through the circumferential surface of the pulley piece, a weight frame is fixedly connected to the other end of the steel cable, and weights are arranged in the weight frame;
the steel cable between the thruster and the pulley piece is parallel to the top support cross frame, and the steel cable between the pulley piece and the weight frame is vertical to the top support cross frame.
The pulley frame comprises a pulley transverse frame, a pulley vertical frame and a pulley inclined frame; the pulley cross frame is fixedly connected with the bottom surface of the top support cross frame through a fifth bolt; the bottom surface of one end of the pulley transverse frame is fixedly connected with the top surface of the pulley vertical frame, and the other end of the pulley vertical frame extends downwards; one end of the pulley inclined frame is fixedly connected with the bottom surface of the other end of the pulley transverse frame, and the other end of the pulley vertical frame is fixedly connected with the side surface of the pulley vertical frame; a pulley groove is vertically formed in the pulley vertical frame, and the pulley part moves along the direction of the pulley groove;
the pulley part comprises a pulley, a pulley shaft and a nut, the pulley is sleeved on the pulley shaft, and the nut is sleeved on the end part, penetrating through the pulley groove, of the pulley shaft.
The axial center of the propeller and the upper vertex of the circumferential surface of the pulley part are on the same horizontal line, and the flange connecting piece, the thrust balance, the intermediate shaft and the axis of the propeller are on the same straight line and are perpendicular to the top support cross frame.
A first hook is arranged at the center of the side surface of the thruster facing one side of the pulley yoke, and one end of the steel cable is fixedly connected to the first hook; and a second hook is arranged at the center of the top surface of the weight frame, and the other end of the steel cable is fixedly connected to the second hook.
The thrust direction of the thruster is consistent with the tension direction of the steel cable.
A calibration method for a calibration device for a thrust balance, the calibration method comprising the steps of:
step one, adjusting a pulley piece: the position of the pulley part on the pulley frame is adjusted to ensure that the upper vertex of the circumferential surface of the pulley part and the axial center of the propeller are on the same straight line;
step two, a weight rack mounting step: firstly, fixedly connecting one end of a steel cable to the center of the side face of one side of the propeller, changing the direction of the other end of the steel cable through the circumferential surface of the pulley piece, then extending the other end of the steel cable downwards, and then fixedly connecting the end of the steel cable extending downwards to the weight frame;
step three, marking a zero value: after the weight holder is hung on the thruster, the voltage value generated by the thrust balance is reset to zero and is marked as a zero value;
step four, loading: sequentially and incrementally placing weights in a weight rack until the total load of the weight rack is more than or equal to the maximum thrust value of the thruster; sequentially calculating calibration coefficients of the thruster according to the current load and voltage of the weight frame, and calculating a fitting output load according to the calibration coefficients;
step five, load unloading: and sequentially decreasing weights loaded on the weight frame in the fourth step, sequentially calculating the calibration coefficients of the thruster according to the current load and the voltage of the weight frame, and calculating the fitting output load according to the calibration coefficients to finish the calibration work.
Comparing the single load in the fourth step with the single fitting output load corresponding to the single load in the fifth step, wherein the comparison result is any one of the following:
the first method comprises the following steps: if the difference between the load and the fitting output load is smaller than the precision difference of the thrust balance, the calibration coefficient is correct;
and the second method comprises the following steps: if the difference between any one time load and the fitting output load is larger than or equal to the precision difference of the thrust balance, the calibration coefficient is wrong, and whether the operation steps are accurate and whether the thrust balance calibration device is installed correctly should be checked.
The load loading step in the fourth step comprises the following steps: sequentially and incrementally placing the weights in the weight rack until the total load of the weight rack is larger than or equal to the maximum thrust value of the thruster, wherein the weight of the weights is larger than or smaller than that of the weights in the fourth step; sequentially calculating calibration coefficients of the thruster according to the current load and voltage of the weight frame, and calculating a fitting output load according to the calibration coefficients;
the load unloading step in the fifth step is as follows: sequentially decreasing weights loaded on the weight frame, sequentially calculating calibration coefficients of the thruster according to the current load and voltage of the weight frame, and calculating fitting output load according to the calibration coefficients;
the comparison step is as follows: comparing the single load with the corresponding single fitting output load, wherein the comparison result is any one of the following:
the first method comprises the following steps: if the difference between the load and the fitting output load is smaller than the precision difference of the thrust balance, the calibration coefficient is correct;
and the second method comprises the following steps: if the difference between any one time load and the fitting output load is larger than or equal to the precision difference of the thrust balance, the calibration coefficient is wrong, and whether the operation steps are accurate and whether the thrust balance calibration device is installed correctly should be checked.
The formula used for calculating the calibration coefficient in the fourth step is as follows:
C xx ＝mV/kgf
wherein: c xx For calibration coefficient, mV is voltage and kgf is load; wherein mV = V/1000.
The formula used for calculating the fitted output load is as follows:
wherein: f x To fit the output load, C xx Is a calibration coefficient, X is a voltage;
wherein:
xv is the lateral one-sided voltage, yv the vertical one-sided voltage.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention relates to a calibration device for a thrust balance, which comprises a top support cross frame and a left support frame and a right support frame, wherein the left support frame and the right support frame are respectively connected with two ends of the top support cross frame; when the design is used, the propeller and the thrust balance are fixed through the bolts, so that the propeller and the thrust balance can be replaced, and the propeller and the thrust balance can be connected with the top support cross frame by replacing the matched flange connecting piece and the middle shaft, so that the propeller and the thrust balance with different models can be suitable for propellers with different sizes. Therefore, the calibration device can perform calibration work and has a wide application range.
2. In the calibration device for the thrust balance, a steel cable between a propeller and a pulley piece is parallel to a top support cross frame, and the steel cable between the pulley piece and a weight frame is vertical to the top support cross frame; this design is when using, and the weight frame passes through the steel cable to be connected on the propeller to through the pulley spare with the load conversion of weight frame to the pulling force of propeller, under the effect of unilateral power, the foil gage of thrust balance's vertical central line bilateral symmetry forms the dual, and one is drawn all the time, and one is pressurized all the time, and thrust balance's atress is invariable, has improved thrust balance's precision, thereby has improved calibration device's demarcation precision and stability. Therefore, the invention can calibrate the thrust balance, and has higher calibration precision and stability.
3. The calibration method of the calibration device comprises the steps of pulley adjustment, weight mounting, zero point marking, load loading and load unloading and the like, the calibration coefficient of the propeller is calculated through the load and the voltage of the thrust balance, the calibration work is completed, and the load is compared with the fitted output load, so that the calibration precision and accuracy are verified, and the precision and accuracy of the calibration device are improved. Therefore, the invention not only can carry out calibration work, but also has higher calibration precision and accuracy.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic view of the construction of the pulley yoke according to the present invention.
FIG. 3 is a data table diagram of embodiment 2 of the present invention.
FIG. 4 is a data table diagram of embodiment 4 of the present invention.
Fig. 5 is a schematic structural view of the thrust balance in example 2 of the present invention.
In the figure: left branch strut 1, right branch strut 2, top support crossbearer 3, flange connecting piece 4, first bolt 41, second bolt 42, third bolt 43, fourth bolt 44, fifth bolt 45, thrust balance 5, jackshaft 6, propeller 7, first couple 71, second couple 72, pulley yoke 8, pulley crossbearer 81, pulley erects 82, pulley sloping 83, pulley groove 84, pulley spare 9, pulley 91, pulley shaft 92, nut 93, steel cable 10, weight frame 11, 111.
Detailed Description
The present invention will be described in further detail with reference to the following description and embodiments in conjunction with the accompanying drawings.
Referring to fig. 1 to 5, a calibration device for a thrust balance includes: a left support frame 1, a right support frame 2 and a top support cross frame 3; one end of the top supporting transverse frame 3 is fixedly connected with the top end of the left supporting frame 1, and the other end of the top supporting transverse frame 3 is fixedly connected with the top end of the right supporting frame 2; the top surface of the middle part of the top support transverse frame 3 is connected with the top end of a flange connecting piece 4 through a first bolt 41, the bottom end of the flange connecting piece 4 is connected with the top end of a thrust balance 5 through a second bolt 42, the bottom end of the thrust balance 5 is connected with the top end of an intermediate shaft 6 through a third bolt 43, and the bottom end of the intermediate shaft 6 is connected with the top end of a propeller 7 through a fourth bolt 44; the bottom surface of the top support cross frame 3 is fixedly connected with a pulley yoke 8 through a fifth bolt 45, the pulley yoke 8 is positioned at one side of the propeller 7, and the bottom end of the pulley yoke 8 is movably connected with a pulley part 9; the center of the side surface of one side of the thruster 7 is fixedly connected with one end of a steel cable 10, the other end of the steel cable 10 passes through the circumferential surface of the pulley member 9, the direction of the steel cable is changed, and the steel cable extends downwards, the other end of the steel cable 10 is fixedly connected with a weight holder 11, and weights 111 are arranged in the weight holder 11;
the steel cable 10 between the thruster 7 and the pulley member 9 is parallel to the top support cross frame 3, and the steel cable 10 between the pulley member 9 and the weight stand 11 is perpendicular to the top support cross frame 3.
The pulley frame 8 comprises a pulley transverse frame 81, a pulley vertical frame 82 and a pulley inclined frame 83; the pulley cross frame 81 is fixedly connected with the bottom surface of the top support cross frame 3 through a fifth bolt 45; the bottom surface of one end of the pulley transverse frame 81 is fixedly connected with the top surface of the pulley vertical frame 82, and the other end of the pulley vertical frame 82 extends downwards; one end of the pulley inclined frame 83 is fixedly connected with the bottom surface of the other end of the pulley transverse frame 81, and the other end of the pulley vertical frame 82 is fixedly connected with the side surface of the pulley vertical frame 82; a pulley groove 84 is vertically formed in the pulley vertical frame 82, and the pulley member 9 moves along the direction of the pulley groove 84;
the pulley member 9 includes a pulley 91, a pulley shaft 92 and a nut 93, the pulley 91 is sleeved on the pulley shaft 92, and the nut 93 is sleeved on an end portion of the pulley shaft 92 passing through the pulley groove 84.
The axial center of the propeller 7 and the upper vertex of the circumferential surface of the pulley component 9 are on the same horizontal line, and the flange connecting piece 4, the thrust balance 5, the intermediate shaft 6 and the axis of the propeller 7 are on the same straight line and are vertical to the top support cross frame 3.
A first hook 71 is arranged at the center of the side surface of the thruster 7 facing the pulley yoke 8, and one end of the steel cable 10 is fixedly connected to the first hook 71; the center of the top surface of the weight frame 11 is provided with a second hook 72, and the other end of the steel cable 10 is fixedly connected to the second hook 72.
The pushing direction of the pusher 7 is consistent with the pulling direction of the wire rope 10.
A calibration method for a calibration device for a thrust balance, the calibration method comprising the steps of:
step one, adjusting a pulley piece: adjusting the position of the pulley member 9 on the pulley frame 8 to make the upper vertex of the circumferential surface of the pulley member 9 and the axial center of the propeller 7 on the same straight line;
step two, a weight rack mounting step: firstly, one end of a steel cable 10 is fixedly connected to the center of the side surface of one side of the propeller 7, the other end of the steel cable 10 changes the direction through the circumferential surface of the pulley member 9 and then extends downwards, and then the end of the steel cable 10 extending downwards is fixedly connected to a weight frame 11;
step three, marking a zero value: after the weight frame 11 is hung on the thruster 7, the voltage value generated by the thrust balance 5 is reset to zero and marked as a zero value;
step four, loading: sequentially and incrementally placing weights 111 in the weight frame 11 until the total load of the weight frame 11 is more than or equal to the maximum thrust value of the thruster 7; sequentially calculating calibration coefficients of the thruster 7 according to the current load and voltage of the weight frame 11, and calculating a fitting output load according to the calibration coefficients;
step five, load unloading: sequentially decreasing the weights 111 loaded on the weight frame 11 in the fourth step, sequentially calculating the calibration coefficients of the thruster 7 according to the current load and voltage of the weight frame 11, and calculating the fitting output load according to the calibration coefficients to finish the calibration work.
The calibration method further comprises a comparison step after the fifth step, wherein the comparison step comprises the following steps:
comparing the single load in the fourth step with the single fitting output load corresponding to the single load in the fifth step, wherein the comparison result is any one of the following:
the first method comprises the following steps: if the difference between the load and the fitting output load is less than the precision difference of the thrust balance 5, the calibration coefficient is correct;
and the second method comprises the following steps: if the difference between the load at any time and the fitting output load is larger than or equal to the precision difference of the thrust balance 5, the calibration coefficient is wrong, and whether the operation steps are accurate and whether the thrust balance calibration device is installed correctly should be checked.
The load loading step in the fourth step comprises the following steps: sequentially and incrementally placing the weights 111 in the weight frame 11 until the total load of the weight frame 11 is larger than or equal to the maximum thrust value of the thruster 7, and the weight of the weights 111 is larger than or smaller than the weight of the weights in the fourth step; sequentially calculating calibration coefficients of the thruster 7 according to the current load and voltage of the weight frame 11, and calculating a fitting output load according to the calibration coefficients;
the load unloading step in the fifth step is as follows: sequentially decreasing weights 111 loaded on the weight holder 11 progressively, sequentially calculating calibration coefficients of the thruster 7 according to the current load and voltage of the weight holder 11, and calculating fitting output load according to the calibration coefficients;
the comparison step is as follows: comparing the single load with the corresponding single fitting output load, wherein the comparison result is any one of the following:
the first method comprises the following steps: if the difference between the load and the fitting output load is less than the precision difference of the thrust balance 5, the calibration coefficient is correct;
and the second method comprises the following steps: if the difference between the load at any time and the fitting output load is larger than or equal to the precision difference of the thrust balance 5, the calibration coefficient is wrong, and whether the operation steps are accurate and whether the thrust balance calibration device is installed correctly should be checked.
The formula used for calculating the calibration coefficient in the fourth step is as follows:
C xx ＝mV/kgf
wherein: c xx For calibration coefficient, mV is voltage and kgf is load; where mV = V/1000.
The formula used for calculating the fitted output load is as follows:
wherein: f x To fit the output load, C xx Is a calibration coefficient, X is a voltage;
wherein:
xv is the horizontal single-sided voltage, yv is the vertical single-sided voltage.
The principle of the invention is illustrated as follows:
the thrust balance calibration device adopts a unilateral horizontal loading mode for calibration, and the thrust balance is mainly used for measuring the horizontal axial thrust of the propeller, so that the thrust balance is calibrated in a unilateral horizontal mode in order to keep consistent with the actual thrust direction of the propeller, and the weight of the weight is linearly changed along with the increase and decrease of the weight.
Example 1:
referring to fig. 1 to 5, a calibration device for a thrust balance includes: a left support frame 1, a right support frame 2 and a top support cross frame 3; one end of the top supporting transverse frame 3 is fixedly connected with the top end of the left supporting frame 1, and the other end of the top supporting transverse frame 3 is fixedly connected with the top end of the right supporting frame 2; the top surface of the middle part of the top support transverse frame 3 is connected with the top end of a flange connecting piece 4 through a first bolt 41, the bottom end of the flange connecting piece 4 is connected with the top end of a thrust balance 5 through a second bolt 42, the bottom end of the thrust balance 5 is connected with the top end of an intermediate shaft 6 through a third bolt 43, and the bottom end of the intermediate shaft 6 is connected with the top end of a propeller 7 through a fourth bolt 44; the bottom surface of the top support cross frame 3 is fixedly connected with a pulley yoke 8 through a fifth bolt 45, the pulley yoke 8 is positioned at one side of the propeller 7, and the bottom end of the pulley yoke 8 is movably connected with a pulley part 9; the center of the side surface of one side of the thruster 7 is fixedly connected with one end of a steel cable 10, the other end of the steel cable 10 passes through the circumferential surface of the pulley member 9, the direction of the steel cable is changed, and the steel cable extends downwards, the other end of the steel cable 10 is fixedly connected with a weight holder 11, and weights 111 are arranged in the weight holder 11; the steel cable 10 between the thruster 7 and the pulley piece 9 is parallel to the top support cross frame 3, and the steel cable 10 between the pulley piece 9 and the weight frame 11 is vertical to the top support cross frame 3; the preferred thrust balance is a three-force thrust balance.
When the device is applied, the thrust balance 5 is fixed on the flange connecting piece 4, the lower end of the thrust balance 5 is sequentially connected with the intermediate shaft 6 and the propeller 7, the propeller 7 is leveled to be parallel to the thrust balance, and the thrust balance is not stressed; keeping the axle centers of the flange connecting piece 4, the thrust balance 5, the intermediate shaft 6 and the propeller 7 on a straight line, then adjusting the position of the pulley piece 9 on the pulley frame 8 to enable the upper vertex of the circumferential surface of the pulley piece 9 and the axial center of the propeller 7 to be on a horizontal line, then fixedly connecting one end of the steel cable 10 to the side center of the propeller 7, enabling the other end of the steel cable 10 to extend downwards after the direction of the other end of the steel cable changes through the circumferential surface of the pulley piece, hanging the weight frame on the end extending downwards, checking that the horizontal direction and the vertical direction of the steel cable 10 are in a right angle state, and thus completing the installation of the device before calibration.
Example 2:
the basic contents are the same as example 1, except that:
after the calibration device is installed, calibrating the thrust balance according to a calibration method of the calibration device for the thrust balance, wherein the calibration method comprises the following steps:
step one, adjusting a pulley piece: adjusting the position of the pulley member 9 on the pulley frame 8 to make the upper vertex of the circumferential surface of the pulley member 9 and the axial center of the propeller 7 on the same straight line;
step two, a weight rack mounting step: firstly, one end of a steel cable 10 is fixedly connected to the center of the side surface of one side of the propeller 7, the other end of the steel cable 10 changes the direction through the circumferential surface of the pulley member 9 and then extends downwards, and then the end of the steel cable 10 extending downwards is fixedly connected to a weight frame 11;
step three, marking a zero value: after the weight frame 11 is mounted on the thruster 7, the thrust balance 3 generates a tiny voltage due to the self weight of the weight frame 11, and in order to ensure the calibration precision, the voltage value generated by the thrust balance 5 needs to be reset to zero and is marked as a zero value; in practice, the step can be omitted according to the size of the propeller and the precision of the thrust balance;
step four, loading: the weights 111 are sequentially and incrementally placed in the weight frame 11, the weight of the weight placed at a time has no fixed standard, in the embodiment, the weights are sequentially and incrementally increased according to 100kg, and the incremental upper limit is the thrust upper limit of the thruster;
according to the size of the propeller, the diameter of the steel cable needs to be adjusted according to the requirement, and the detailed description is omitted;
the force and moment generated by the load on the thrust balance can enable the strain gauge of the thrust balance to generate displacement and deformation, the displacement and deformation of the strain gauge can cause voltage change, the three-component thrust balance is provided with 4 strain gauges, as shown in figure 5, because the calibration device is unilateral force, only the unilateral x strain gauge in the stress direction can generate voltage theoretically, and tiny voltage can be generated in the unilateral y direction due to the influence of precision;
according to the current load and voltage of the weight frame 11, as shown in fig. 3, the calibration coefficients of the thruster 7 can be sequentially calculated, and the fitting output load can be calculated according to the calibration coefficients;
step five, load unloading: sequentially decreasing the weights 111 loaded on the weight holder 11 in the fourth step, sequentially calculating the calibration coefficients of the thruster 7 according to the current load and voltage of the weight holder 11, as shown in fig. 3, and calculating the fitting output load according to the calibration coefficients to complete the calibration work.
Preferably, the formula used for calculating the calibration coefficient is as follows:
C xx ＝mV/kgf
wherein: c xx For calibration coefficient, mV is voltage and kgf is load; wherein mV = V/1000.
Example 3:
the basic content is the same as that of the embodiment 2, except that:
comparing the single load in the fourth step with the single fitting output load corresponding to the single load in the fifth step, wherein the comparison result is any one of the following:
the first method comprises the following steps: if the difference value between the load and the fitting output load is smaller than the precision difference value of the thrust balance 5, the calibration coefficient is correct;
and the second method comprises the following steps: if the difference between the load at any time and the fitting output load is larger than or equal to the precision difference of the thrust balance 5, the calibration coefficient is wrong, and factors which can influence the precision such as whether the operation steps are accurate, whether the thrust balance calibration device is installed correctly, whether the thrust balance is damaged and the like should be checked.
Preferably, the formula used for calculating the fitted output load is:
wherein: f x For fitting the inputOut of load, C xx Is a calibration coefficient, X is a voltage;
wherein:
xv is the lateral one-sided voltage, yv the vertical one-sided voltage.
Example 4:
the basic contents are the same as example 3, except that:
in order to verify whether the error range of the load and the fitting output load is within the precision difference range of the thrust balance 5, the weight of the adjustable weight is calibrated again, and the precision difference of the thrust balance adopted in the embodiment is 3%.
The load loading step in the fourth step comprises the following steps: sequentially and incrementally placing the weights 111 in the weight frame 11 until the total load of the weight frame 11 is larger than or equal to the maximum thrust value of the thruster 7, and the weight of the weights 111 is larger than or smaller than the weight of the weights in the fourth step; sequentially calculating the calibration coefficients of the thruster 7 according to the current load and voltage of the weight frame 11, and calculating the fitting output load according to the calibration coefficients, as shown in fig. 4;
the load unloading step in the fifth step is as follows: sequentially decreasing weights 111 loaded on the weight holder 11 progressively, sequentially calculating calibration coefficients of the thruster 7 according to the current load and voltage of the weight holder 11, and calculating fitting output load according to the calibration coefficients;
the comparison step is as follows: and comparing the single load with the corresponding single fitting output load, wherein the difference between the load and the fitting output load is less than 3% of the precision difference of the thrust balance 5, and the calibration coefficient is correct.
The above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above embodiment, but equivalent modifications or changes made by those skilled in the art according to the present disclosure should be included in the scope of the present invention as set forth in the appended claims.
Claims (10)
1. A calibration device for a thrust balance, the calibration device comprising: a left support frame (1), a right support frame (2) and a top support cross frame (3); one end of the top supporting transverse frame (3) is fixedly connected with the top end of the left supporting frame (1), and the other end of the top supporting transverse frame (3) is fixedly connected with the top end of the right supporting frame (2); the top surface of the middle part of the top support transverse frame (3) is connected with the top end of a flange connecting piece (4) through a first bolt (41), the bottom end of the flange connecting piece (4) is connected with the top end of a thrust balance (5) through a second bolt (42), the bottom end of the thrust balance (5) is connected with the top end of an intermediate shaft (6) through a third bolt (43), and the bottom end of the intermediate shaft (6) is connected with the top end of a propeller (7) through a fourth bolt (44); the bottom surface of the top support transverse frame (3) is fixedly connected with a pulley yoke (8) through a fifth bolt (45), the pulley yoke (8) is positioned on one side of the propeller (7), and the bottom end of the pulley yoke (8) is movably connected with a pulley piece (9); the center of the side face of one side of the propeller (7) is fixedly connected with one end of a steel cable (10), the other end of the steel cable (10) changes direction after passing through the circumferential surface of the pulley piece (9) and then extends downwards, the other end of the steel cable (10) is fixedly connected with a weight frame (11), and weights (111) are arranged in the weight frame (11);
the steel cable (10) between the thruster (7) and the pulley piece (9) is parallel to the top support cross frame (3), and the steel cable (10) between the pulley piece (9) and the weight frame (11) is vertical to the top support cross frame (3).
2. The calibration device for a thrust balance according to claim 1, wherein: the pulley frame (8) comprises a pulley transverse frame (81), a pulley vertical frame (82) and a pulley inclined frame (83); the pulley transverse frame (81) is fixedly connected with the bottom surface of the top support transverse frame (3) through a fifth bolt (45); the bottom surface of one end of the pulley transverse frame (81) is fixedly connected with the top surface of the pulley vertical frame (82), and the other end of the pulley vertical frame (82) extends downwards; one end of the pulley inclined frame (83) is fixedly connected with the bottom surface of the other end of the pulley transverse frame (81), and the other end of the pulley vertical frame (82) is fixedly connected with the side surface of the pulley vertical frame (82); a pulley groove (84) is vertically formed in the pulley vertical frame (82), and the pulley piece (9) moves along the direction of the pulley groove (84);
the pulley piece (9) comprises a pulley (91), a pulley shaft (92) and a nut (93), the pulley (91) is sleeved on the pulley shaft (92), and the nut (93) is sleeved on the end part, penetrating through the pulley groove (84), of one end of the pulley shaft (92).
3. The calibration device for a thrust balance according to claim 2, wherein: the axial center of the propeller (7) and the upper vertex of the circumferential surface of the pulley part (9) are on the same horizontal line, and the flange connecting piece (4), the thrust balance (5), the intermediate shaft (6) and the axis of the propeller (7) are on the same straight line and are perpendicular to the top support cross frame (3).
4. A calibration device for a thrust balance according to claim 3, wherein: a first hook (71) is arranged at the center of the side surface of the thruster (7) facing one side of the pulley yoke (8), and one end of the steel cable (10) is fixedly connected to the first hook (71); the top surface center of weight frame (11) is provided with second couple (72), the other end fixed connection of steel cable (10) is on second couple (72).
5. The calibration device for a thrust balance according to any one of claims 1 to 4, wherein: the thrust direction of the propeller (7) is consistent with the tension direction of the steel cable (10).
6. A calibration method of a calibration device for a thrust balance according to claim 1, characterized in that the calibration method comprises the following steps:
step one, adjusting a pulley piece: the position of the pulley piece (9) on the pulley frame (8) is adjusted to ensure that the upper vertex of the circumferential surface of the pulley piece (9) and the axial center of the propeller (7) are on the same straight line;
step two, a weight rack mounting step: firstly, one end of a steel cable (10) is fixedly connected to the center of the side face of one side of a propeller (7), the other end of the steel cable (10) changes the direction through the circumferential surface of a pulley piece (9) and then extends downwards, and then the downwardly extending end of the steel cable (10) is fixedly connected to a weight stand (11);
step three, marking a zero value: after the weight frame (11) is hung on the thruster (7), the voltage value generated by the thrust balance (5) is reset to zero and marked as a zero value;
step four, loading: sequentially and incrementally placing weights (111) in the weight frame (11) until the total load of the weight frame (11) is larger than or equal to the maximum thrust value of the propeller (7); sequentially calculating calibration coefficients of the thruster (7) according to the current load and voltage of the weight frame (11), and calculating a fitting output load according to the calibration coefficients;
step five, load unloading: sequentially decreasing weights (111) loaded on the weight frame (11) in the fourth step, sequentially calculating the calibration coefficient of the propeller (7) according to the current load and voltage of the weight frame (11), and calculating the fitting output load according to the calibration coefficient to finish the calibration work.
7. The calibration method for the calibration device of the thrust balance according to claim 6, further comprising a comparison step after the fifth step, wherein the comparison step is:
comparing the single load in the fourth step with the single fitting output load corresponding to the single load in the fifth step, wherein the comparison result is any one of the following:
the first method comprises the following steps: if the difference between the load and the fitting output load is less than the precision difference of the thrust balance (5), the calibration coefficient is correct;
and the second method comprises the following steps: if the difference between the load at any time and the fitting output load is larger than or equal to the precision difference of the thrust balance (5), the calibration coefficient is wrong, and whether the operation steps are accurate and whether the thrust balance calibration device is installed correctly should be checked.
8. The calibration method of the calibration device for the thrust balance according to claim 7, wherein:
the load loading step in the fourth step comprises the following steps: sequentially and incrementally placing the weights (111) in the weight frame (11) until the total load of the weight frame (11) is larger than or equal to the maximum thrust value of the thruster (7), wherein the weight of the weights (111) is larger than or smaller than the weight in the fourth step; sequentially calculating calibration coefficients of the thruster (7) according to the current load and voltage of the weight frame (11), and calculating a fitting output load according to the calibration coefficients;
the load unloading step in the fifth step is as follows: sequentially decreasing weights (111) loaded on the weight frame (11), sequentially calculating calibration coefficients of the thruster (7) according to the current load and voltage of the weight frame (11), and calculating fitting output load according to the calibration coefficients;
the comparison step is as follows: comparing the single load with the corresponding single fitting output load, wherein the comparison result is any one of the following:
the first method comprises the following steps: if the difference between the load and the fitting output load is less than the precision difference of the thrust balance (5), the calibration coefficient is correct;
and the second method comprises the following steps: if the difference between the load at any time and the fitting output load is larger than or equal to the precision difference of the thrust balance (5), the calibration coefficient is wrong, and whether the operation steps are accurate and whether the thrust balance calibration device is installed correctly should be checked.
9. The calibration method of the calibration device for the thrust balance according to claim 6, 7 or 8, wherein the formula used for calculating the calibration coefficient in the fourth step is as follows:
C xx ＝mV/kgf
wherein: c xx For calibration coefficient, mV is voltage and kgf is load; where mV = V/1000.
10. The calibration method of the calibration device for the thrust balance according to claim 6, 7 or 8, wherein the formula for calculating the fitted output load is as follows:
wherein: f x To fit the output load, C xx Is a calibration coefficient, X is a voltage;
wherein:
xv is the lateral one-sided voltage, yv the vertical one-sided voltage.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211063925.1A CN115560907A (en) | 2022-08-31 | 2022-08-31 | Calibration device for thrust balance |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211063925.1A CN115560907A (en) | 2022-08-31 | 2022-08-31 | Calibration device for thrust balance |
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| CN115560907A true CN115560907A (en) | 2023-01-03 |
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| CN202211063925.1A Pending CN115560907A (en) | 2022-08-31 | 2022-08-31 | Calibration device for thrust balance |
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| CN (1) | CN115560907A (en) |
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