CN114441078B - Online torque measurement structure and online torque measurement method of power measurement device - Google Patents
Online torque measurement structure and online torque measurement method of power measurement device Download PDFInfo
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- CN114441078B CN114441078B CN202111593773.1A CN202111593773A CN114441078B CN 114441078 B CN114441078 B CN 114441078B CN 202111593773 A CN202111593773 A CN 202111593773A CN 114441078 B CN114441078 B CN 114441078B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
- G01L3/24—Devices for determining the value of power, e.g. by measuring and simultaneously multiplying the values of torque and revolutions per unit of time, by multiplying the values of tractive or propulsive force and velocity
- G01L3/242—Devices for determining the value of power, e.g. by measuring and simultaneously multiplying the values of torque and revolutions per unit of time, by multiplying the values of tractive or propulsive force and velocity by measuring and simultaneously multiplying torque and velocity
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Abstract
The invention provides an online torque measurement structure and an online torque measurement method of a power measurement device, wherein the online torque measurement structure of the power measurement device comprises a standard torque sensor and two groups of flexible couplings with the same structure, the two groups of flexible couplings are symmetrically connected to two sides of the standard torque sensor, one group of flexible couplings is connected with the standard torque sensor and a main transmission shaft of the power measurement device, and the other group of flexible couplings is connected with the standard torque sensor and a secondary transmission shaft of the power measurement device; the two groups of flexible couplings respectively comprise a first hydraulic shaft sleeve, an elastic element, a coupling flange, a second hydraulic shaft sleeve and an adapter flange which are sequentially connected, and the adapter flanges of the two groups of flexible couplings are respectively and fixedly connected with the standard torque sensor. The invention can obviously improve the torque measurement precision of the power measurement device.
Description
Technical Field
The invention belongs to the technical field of measurement and test, and particularly relates to an online torque measurement structure and an online torque measurement method of a power measurement device.
Background
The power parameter is one of the most core performance parameters of the engine, the power measuring device is core equipment for calibrating the power parameter of the engine, the calibration of the power parameter of the engine is completed by respectively calibrating the torque and the rotating speed parameter, the rotating speed parameter is easy to obtain accurately, and the torque parameter has larger error because the coaxiality of the main transmission shaft of the power measuring device and the installation of the torque sensor can not be ensured. At present, a rigid coupler is often adopted for connecting a torque sensor in online calibration of a power measuring device, and the torque parameter measurement is greatly influenced due to the problems of installation gaps, coaxiality deviation and the like. The existing power measuring device torque on-line calibration mostly adopts a mode of hanging weights on a force arm mechanism to directly calibrate a torque sensor matched with the power measuring device, the position of a force point of the calibrated torque is different from that of an input point of the actual torque of the power measuring device, and a larger error exists in a calibration result.
Disclosure of Invention
The invention provides an online torque measurement structure and an online torque measurement method of a power measurement device, which can remarkably improve the torque measurement precision, aiming at the problems of low torque parameter measurement precision and large deviation in the online torque calibration of the existing power measurement device.
In order to achieve the above object, one aspect of the present invention provides an online torque measurement structure of a power measurement device, including a standard torque sensor and two sets of flexible couplings with the same structure, where the two sets of flexible couplings are symmetrically connected to two sides of the standard torque sensor, one set of flexible couplings connects the standard torque sensor with a main transmission shaft of the power measurement device, and the other set of flexible couplings connects the standard torque sensor with a secondary transmission shaft of the power measurement device; the two groups of flexible couplings respectively comprise a first hydraulic shaft sleeve, an elastic element, a coupling flange, a second hydraulic shaft sleeve and an adapter flange which are sequentially connected, wherein the elastic element is fixedly connected with the first hydraulic shaft sleeve, the coupling flange is fixedly connected with the elastic element, the second hydraulic shaft sleeve is in expansion connection with the coupling flange, and the adapter flange is in expansion connection with the second hydraulic shaft sleeve; the first hydraulic shaft sleeve of the group of flexible couplings is in expansion connection with the main transmission shaft of the power measuring device, the first hydraulic shaft sleeve of the other group of flexible couplings is in expansion connection with the auxiliary transmission shaft of the power measuring device, and the adapting flanges of the two groups of flexible couplings are respectively and fixedly connected with the standard torque sensor.
Preferably, the elastic element is a laminated spring, consisting of a plurality of single-layer elastic sheets.
Preferably, the on-line torque measuring structure of the power measuring device further comprises a deviation angle measuring unit for measuring an axial deviation angle of an axis of the main transmission shaft of the power measuring device from an axis of the standard torque sensor.
Preferably, the deviation angle measuring unit is a laser interferometer, an angle sensor or an extensometer.
Another aspect of the present invention provides an online torque measurement method for a power measurement device, which measures online torque using the online torque measurement structure of the power measurement device, including:
step S1: the power measuring device is operated under the set torque, and the torque M generated by the main transmission shaft of the power measuring device is measured by the standard torque sensor 1 ；
Step S2: assuming that an axial deviation angle between an axis of a main transmission shaft of the power measuring device and an axis of the standard torque sensor is α, the corrected online torque M is obtained as follows:
preferably, before the step S2, the power measurement device on-line torque measurement method further includes: and measuring an axial deviation angle alpha between the axis of the main transmission shaft of the power measuring device and the axis of the standard torque sensor through the deviation angle measuring unit.
The power measuring device on-line torque measuring structure and the on-line torque measuring method can obviously improve the torque measuring precision.
Drawings
Fig. 1 is a schematic diagram of an on-line torque measurement structure of a power measurement device according to an embodiment of the present invention.
Fig. 2 is a flowchart of an online torque measurement method of a power measurement device according to an embodiment of the present invention.
Fig. 3 is a schematic diagram showing a comparison of an on-line torque measurement method using a power measurement apparatus according to an embodiment of the present invention and an on-line torque measured using a measurement method of the related art.
Detailed Description
In order to make the technical scheme of the present invention better understood by those skilled in the art, the following detailed description of the specific embodiments of the present invention will be given with reference to the accompanying drawings.
The embodiment of the invention provides an online torque measurement structure of a power measurement device, which adopts a flexible coupling to connect a transmission shaft of the power measurement device with a torque sensor, and can eliminate and reduce a connection gap and a deflection angle, thereby obviously improving the torque measurement precision.
Fig. 1 is a schematic diagram of an on-line torque measurement structure of a power measurement device according to an embodiment of the present invention. As shown in fig. 1, the power measuring device of the embodiment of the present invention includes a standard torque sensor 6 and two sets of flexible couplings symmetrically connected to both sides of the standard torque sensor 6 and having the same structure. The two sets of flexible couplings are shown in fig. 1 as the left set and the right set of standard torque sensor 6. Wherein for example a left set of flexible couplings connects the standard torque sensor 6 with the main drive shaft of the power measuring device, and a right set of flexible couplings connects the standard torque sensor 6 with the secondary drive shaft of the power measuring device, and vice versa.
The two groups of flexible couplings respectively comprise a first hydraulic shaft sleeve 1, an elastic element 2, a coupling flange 3, a second hydraulic shaft sleeve 4 and an adapter flange 5 which are connected in sequence. The first hydraulic shaft sleeve 1 of one group of flexible couplings is in expansion connection with the main transmission shaft of the power measuring device, and the first hydraulic shaft sleeve 1 of the other group of flexible couplings is in expansion connection with the auxiliary transmission shaft of the power measuring device. That is, the first hydraulic bushing 1 functions to connect two sets of flexible couplings with the main drive shaft and the slave drive shaft of the power measuring device, respectively, without play.
In each group of flexible couplings, the elastic element 2 is fixedly connected with the first hydraulic shaft sleeve 1, for example, in a flange form, the elastic element 2 has the function of adjusting runout in the movement process of the power measuring device through elasticity, overcoming bending moment and radial force, improving coaxiality between the power measuring device and the standard torque sensor 6, achieving the purpose of torque lossless transmission and improving torque measuring precision. The coupling flange 3 is fixedly connected to the spring element 2, for example in the form of a flange, the coupling flange 3 serving to connect the spring element 2 to the standard torque sensor 6. The second hydraulic shaft sleeve 4 is in expansion connection with the coupling flange 3, so that the coupling flange 3 is connected with the standard torque sensor 6 without gaps. The adapter flange 5 is in expansion connection with the second hydraulic bushing 4, and the adapter flange 5 is used for connecting and fixing the standard torque sensor 6, namely, the adapter flanges 5 of the two groups of flexible couplings are respectively and fixedly connected with the standard torque sensor 6.
Preferably, the elastic element 2 is a laminated spring, consisting of a plurality of single-layer elastic sheets. After the two groups of flexible couplings are installed with the standard torque sensor 6, the axial deviation angle between the axis of the main transmission shaft of the power measuring device and the axis of the standard torque sensor 6 can be effectively reduced. The axial deviation angle may be measured by a deviation angle measuring unit. Specifically, the power measuring device on-line torque measuring structure of the embodiment of the present invention may further include a deviation angle measuring unit for measuring an axial deviation angle of the axis of the main drive shaft of the power measuring device from the axis of the standard torque sensor 6. The deviation angle measuring unit is, for example, a laser interferometer, an angle sensor, an extensometer or the like.
The embodiment of the invention also provides an online torque measuring method of the power measuring device, and the online torque is measured by using the online torque measuring structure of the power measuring device. Fig. 2 is a flowchart of an online torque measurement method of a power measurement device according to an embodiment of the present invention. As shown in fig. 2, the power measuring device on-line torque measuring method according to the embodiment of the present invention includes steps S1 and S2.
In step S1, the power measuring device is operated at the set torque, and the torque M generated by the main drive shaft of the power measuring device is measured by the standard torque sensor 6 1 ；
In step S2: assuming that the axial deviation angle between the axis of the main drive shaft of the power measuring device and the axis of the standard torque sensor 6 is α, the corrected online torque M is obtained as follows:
the relationship curve between the corrected online torque M and the axial deviation angle α can be obtained by the expression (1).
Preferably, before the step S2, the online torque measurement method of the power measurement device according to the embodiment of the present invention may further include: the axial deviation angle α of the axis of the main drive shaft of the power measuring device from the axis of the standard torque sensor 6 is obtained by the deviation angle measuring unit.
The power measuring device on-line torque measuring method and technical effects of the power measuring device according to the embodiment of the invention are described below by way of a specific example.
First, an axial deviation angle α of the axis of the main drive shaft of the power measuring device from the axis of the standard torque sensor 6 is measured by an angle sensor, α=0.2 rad. Next, the power measuring device is set to the torque M s Operating at =100 Nm, the torque M produced by the main drive shaft of the power measuring device is measured by a standard torque sensor 6 1 The measurement error was 1% when=101 Nm, and the online torque M after the calculation correction was 100.33Nm according to the above equation (1), and the measurement error was reduced from 1% to 0.33%.
In the present embodiment, as the axial deviation angle α decreases, the measured value of the standard torque sensor 6 will be more accurate, and the corrected online torque M will be closer to the set torque M of the power measuring device s 。
In comparison, in the case of the same axial deviation angle α, the torque accuracy measured by the flexible coupling of the present invention is significantly improved as compared with the conventional technique using a rigid coupling. Fig. 3 is a schematic diagram showing a comparison of an on-line torque measurement method using a power measurement apparatus according to an embodiment of the present invention and an on-line torque measured using a measurement method of the related art. In fig. 3, it is assumed that the set torque M of the power measuring device s The upper curve is the torque curve measured using a rigid coupling according to the prior art, while the lower curve is the torque curve measured using a flexible coupling according to the on-line torque measurement method of the power measurement device according to an embodiment of the present invention. As can be seen from fig. 3, under the condition of the same axial deviation angle alpha, the torque measured by the on-line torque measuring method based on the flexible coupling is more similar to the set torque of the power measuring device, and the measuring precision is remarkableImproving the quality.
In summary, compared with the prior art, the online torque measurement structure and the online torque measurement method of the power measurement device provided by the embodiment of the invention eliminate the installation deviation and the gap between shaft system assemblies by utilizing the elastic deformation of the flexible coupling, and compared with the rigid coupling adopted in the traditional torque measurement calibration, the online torque measurement structure and the online torque measurement method of the power measurement device provided by the embodiment of the invention have better fitting property, can effectively reduce vibration, reduce the axial deviation angle of an installation standard torque sensor, and improve coaxiality, thereby improving the torque measurement precision of the power measurement device, and can meet the requirements of measuring and testing more torque parameters of the power measurement device.
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that modifications may be made to the described embodiments without departing from the spirit and scope of the invention. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive.
Claims (5)
1. The online torque measurement method of the power measurement device comprises the steps that online torque is measured by using an online torque measurement structure of the power measurement device, the online torque measurement structure of the power measurement device comprises a standard torque sensor and two groups of flexible couplings with the same structure, the two groups of flexible couplings are symmetrically connected to two sides of the standard torque sensor, one group of flexible couplings is connected with the standard torque sensor and a main transmission shaft of the power measurement device, and the other group of flexible couplings is connected with the standard torque sensor and a slave transmission shaft of the power measurement device;
the two groups of flexible couplings respectively comprise a first hydraulic shaft sleeve, an elastic element, a coupling flange, a second hydraulic shaft sleeve and an adapter flange which are sequentially connected, wherein the elastic element is fixedly connected with the first hydraulic shaft sleeve, the coupling flange is fixedly connected with the elastic element, the second hydraulic shaft sleeve is in expansion connection with the coupling flange, and the adapter flange is in expansion connection with the second hydraulic shaft sleeve;
the first hydraulic shaft sleeve of the group of flexible couplings is in expansion connection with the main transmission shaft of the power measuring device, the first hydraulic shaft sleeve of the other group of flexible couplings is in expansion connection with the auxiliary transmission shaft of the power measuring device, the adapting flanges of the two groups of flexible couplings are respectively and fixedly connected with the standard torque sensor,
characterized in that the method comprises:
step S1: the power measuring device is operated under the set torque, and the torque M generated by the main transmission shaft of the power measuring device is measured by the standard torque sensor 1 ；
Step S2: assuming that an axial deviation angle between an axis of a main transmission shaft of the power measuring device and an axis of the standard torque sensor is α, the corrected online torque M is obtained as follows:
2. the method for measuring torque in line with a power measuring device according to claim 1, wherein said elastic member is a laminated spring composed of a plurality of single-layer elastic sheets.
3. The on-line torque measurement method of a power measurement device according to claim 1 or 2, wherein the on-line torque measurement structure of a power measurement device further comprises a deviation angle measurement unit for measuring an axial deviation angle of an axis of a main drive shaft of the power measurement device from an axis of the standard torque sensor.
4. The power measuring apparatus on-line torque measuring method according to claim 3, wherein the deviation angle measuring unit is a laser interferometer, an angle sensor, or an extensometer.
5. The power measuring device on-line torque measuring method according to claim 3, wherein prior to said step S2, said method further comprises: and measuring an axial deviation angle alpha between the axis of the main transmission shaft of the power measuring device and the axis of the standard torque sensor through the deviation angle measuring unit.
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|---|---|---|---|---|
| DE10114338A1 (en) * | 2001-03-23 | 2002-09-26 | Mayr Christian Gmbh & Co Kg | Adaptor flange couples all-steel shaft union with a torque drive |
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