CN113008437B - Device and method for testing dynamic braking torque of brake motor - Google Patents
Device and method for testing dynamic braking torque of brake motor Download PDFInfo
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- CN113008437B CN113008437B CN202110220838.1A CN202110220838A CN113008437B CN 113008437 B CN113008437 B CN 113008437B CN 202110220838 A CN202110220838 A CN 202110220838A CN 113008437 B CN113008437 B CN 113008437B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/28—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for testing brakes
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Abstract
The invention relates to the technical field of crane motors, and provides a device and a method for testing dynamic braking torque of a brake motor, wherein the device comprises the following steps: the test platform is used for fixing the brake motor; the bottom end of the supporting frame is fixed on the mounting platform, the top end of the supporting frame is provided with the test platform, and the test platform can swing by taking the supporting frame as a fulcrum; and the bottom of the pull pressure sensor is fixedly connected with the mounting platform through a sensor bracket, and the top of the pull pressure sensor is fixedly connected with the bottom of the test platform. The invention has the characteristics of accurate data and high measurement frequency response, and can measure the transient change of the dynamic braking torque to obtain the detailed change process of the dynamic braking torque in the motor braking process.
Description
Technical Field
The invention relates to the technical field of crane motors, in particular to a device and a method for testing dynamic braking torque of a brake motor.
Background
In the field of cranes, for various types of cranes, the braking performance of a hoisting mechanism is an important index related to safety, and the safety of life of field construction personnel and the property safety of equipment users are related. For a part of cranes, especially for hoisting mechanisms of light and small cranes, the braking performance is mainly determined by the brake of the brake motor. Therefore, in order to improve the braking performance of the hoisting mechanism of the crane, the braking performance of the braking motor needs to be studied deeply.
The traditional measuring method comprises a torque rotating speed sensor method and a calculating method. The principle of the torque and rotation speed sensor method can be summarized as that a tested motor is fixed on a test platform, the torque and rotation speed sensor is connected with an output shaft of the motor, when the motor brakes, a brake disc is in contact with a rotor to generate brake torque so as to reduce the speed and stop the rotation of the brake motor, and the brake torque is measured by the torque and rotation speed sensor connected with the output shaft of the motor rotor. The principle of the measuring method is simple and intuitive, but the accuracy of measured data is greatly influenced by the accuracy of the torque and rotation speed sensor, the rotational inertia caused by the rotor part of the motor cannot be measured by the torque and rotation speed sensor, the larger the motor is, the larger the volume and the mass of the rotor of the motor are, the larger the rotational inertia is, and the larger the error caused by the part is. The principle of the calculation method can be summarized as that a rotation speed sensor is used for measuring the real-time rotation speed of a brake motor, and according to the kinetic energy theorem, the motor is in a constant-speed rotation initial state and is in a static final state. The dynamic braking torque generated by the brake disc to the motor rotor is determined to be a constant in the braking process from the initial state to the final state due to the fact that the dynamic braking torque works, and therefore the dynamic braking torque is calculated. The theoretical model of the method is an ideal model, and the practical situation is that firstly, a certain time is needed for releasing a brake disc spring in the motor braking process, and a certain gap exists between the brake disc and a motor rotor, so that the brake disc is completely attached to the motor, and the process is not a transient process but a changing process; secondly, after the brake disc is completely attached to the motor rotor, the dynamic braking torque generated in the motor braking process is also a fluctuation value due to the manufacturing process of the motor or various external factors. Therefore, the simple calculation cannot clearly and specifically reflect the whole braking process, and has no practical significance for guiding the real work by using a manufacturer.
Disclosure of Invention
The invention provides a testing device and a testing method for dynamic braking torque of a brake motor, which have the characteristics of accurate data and high measurement frequency response, and can measure the transient change of the dynamic braking torque to obtain the detailed change process of the dynamic braking torque in the braking process of the motor.
The invention provides a testing device for dynamic braking torque of a brake motor, which comprises: the test platform is used for fixing the brake motor; the bottom end of the supporting frame is fixed on the mounting platform, the top end of the supporting frame is provided with the test platform, and the test platform can swing by taking the supporting frame as a fulcrum; the device comprises a pull pressure sensor, wherein the bottom of the pull pressure sensor is fixedly connected with an installation platform through a sensor support, and the top of the pull pressure sensor is fixedly connected with the bottom of a test platform.
According to the testing device for the dynamic braking torque of the brake motor, provided by the invention, the top end of the supporting frame is a sharp corner with a certain included angle and is embedded into a sharp corner groove at the bottom of the test platform.
According to the testing device for the dynamic braking torque of the brake motor, provided by the invention, the included angle of the sharp corners is 90 degrees and the sharp corners are symmetrically arranged with the central line of the test platform.
According to the testing device for the dynamic braking torque of the brake motor, provided by the invention, the two pull pressure sensors are symmetrically arranged on two sides of the supporting frame respectively.
According to the testing device for the dynamic braking torque of the brake motor, the brake motor is connected with the sliding groove in the top of the test platform through the fastening piece, and the center line of the brake motor is overlapped with the center line of the test platform.
According to the testing device for the dynamic braking torque of the brake motor, provided by the invention, the top end of the supporting frame is connected with the bottom of the test platform through the rotating piece.
The device for testing the dynamic braking torque of the brake motor further comprises a signal amplifier, a data collector and a control processor, wherein the signal amplifier is connected with the pull pressure sensor, the data collector is connected with the signal amplifier, and the control processor is respectively connected with the data collector and the brake motor.
According to the testing device for the dynamic braking torque of the brake motor, provided by the invention, the top of the pull pressure sensor is provided with the connecting assembly, the connecting assembly comprises a first connecting body, a second connecting body and a conical pin shaft, the first connecting body is connected with the bottom of the test platform, the second connecting body is connected with the pull pressure sensor, and the conical pin shaft penetrates through the first connecting body and the second connecting body and is fastened through a nut.
The testing device for the dynamic braking torque of the brake motor further comprises an inertia disc and a balance bracket, wherein the inertia disc is connected with a rotating shaft of the brake motor through a coupler; the two balance supports are symmetrically arranged on two sides of the supporting frame respectively and movably arranged on the mounting platform and are used for supporting the test platform.
The invention also provides a test method of the test device for the dynamic braking torque of the brake motor, which comprises the following steps:
controlling a brake motor to reach a stable rotation state;
acquiring a stable rotation moment through a pull pressure sensor, and marking the stable rotation moment as a zero point;
controlling a brake motor to brake to enter an inertial rotation state;
and acquiring dynamic braking torque through a pull pressure sensor.
The invention provides a testing device and a method for dynamic braking torque of a brake motor, wherein a supporting frame supports a testing platform, the testing platform can swing within a certain angle by taking the supporting frame as a fulcrum, a pull pressure sensor is rigidly connected with the testing platform, and the pull pressure sensor is rigidly connected with an installation platform through a sensor support, so that the testing platform has a swinging trend, the pull pressure in the rotation process of the brake motor can be transmitted to the testing platform in real time, and can be accurately measured by the pull pressure sensor, therefore, the invention can measure the change process of the braking torque applied to the motor in the process from the braking start to the final complete stop of the operation of the brake motor after receiving a braking command.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a front view of a testing device for dynamic braking torque of a brake motor provided by the present invention;
FIG. 2 is a left side view of the testing device for dynamic braking torque of the braking motor provided by the present invention;
FIG. 3 is an assembly view of a sensor provided by the present invention;
FIG. 4 is a flow chart of a testing method provided by the present invention;
reference numerals are as follows:
1: a test platform; 2: braking the motor; 3: a support frame;
4: sharp corners; 5: mounting a platform; 6: a pull pressure sensor;
7: a sensor holder; 8: a flange plate; 9: a fastener;
10: a chute; 11: a first connecting body; 12: a second connector;
13: a tapered pin shaft; 14: a nut; 15: an inertia disc;
16: a coupling; 17: a groove; 18: and (6) balancing the bracket.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention may be understood as specific cases by those of ordinary skill in the art.
In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description of the present specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
The testing device for the dynamic braking torque of the brake motor of the present invention is described below with reference to fig. 1 to 3.
The invention relates to a testing device for dynamic braking torque of a brake motor, which mainly comprises: test platform 1, support frame 3 and pull pressure sensor 6.
The test platform 1 is mainly used for fixing the brake motor 2, in this embodiment, the specific shape of the test platform 1 is not particularly limited, and the test platform 1 is preferably rectangular, arranged in the horizontal direction and parallel to the mounting platform 5.
In some embodiments, the mounting platform 5 may also be the ground.
The bottom of the pulling pressure sensor 6 is fixedly connected with the mounting platform 5 through a sensor support 7, and the top of the pulling pressure sensor 6 is fixedly connected with the bottom of the test platform 1 and used for detecting the pulling pressure on the test platform 1.
In the embodiment, the pull pressure sensor 6 is respectively and rigidly connected with the test platform 1 and the mounting platform 5, the test platform 1 is supported by the support frame 3 with the sharp corner 4, so that the test platform 1 has a swinging trend taking the support frame 3 as a fulcrum, and due to the arrangement mode of the pull pressure sensor 6 and the sensor support 7, a reverse torque for hindering the rotation of the test platform 1 is generated on the test platform 1, the torque is equal to and opposite to the rotation torque generated in the braking process of the brake motor 2, so that the pull pressure in the rotation process of the brake motor 2 can be transmitted to the test platform 1 in real time and can be accurately measured by the pull pressure sensor 6, and the change process of the braking torque applied to the motor in the process from the brake command receiving to the complete brake stopping can be measured.
The invention also comprises a signal amplifier, a data collector and a control processor, wherein the signal amplifier is connected with the pull pressure sensor 6, the data collector is connected with the signal amplifier, and the control processor is respectively connected with the data collector and the brake motor 2 and is used for recording all detected data in real time and controlling the start and stop of the brake motor.
The pull pressure sensor 6 can measure the change of the pull pressure on the test platform 1 in real time, transmit the test value to the signal amplifier for signal amplification, transmit the test value to the data acquisition unit for filtering and optimization, and transmit the test value to the control processor through network port communication.
The specific kind of control processor is not limited, and in this embodiment, the control processor is preferably an industrial personal computer.
In a specific embodiment, the included angle of the sharp angle 4 is preferably 90 °, and the sharp angles 4 are symmetrically arranged with respect to the center line of the testing platform 1, specifically: the contained angle of the both sides of this closed angle 4 respectively with test platform 1's central line is 45, and the vertical central line of support frame 3 coincides with test platform 1's central line promptly, on the one hand, has increased test platform 1's stability, and on the other hand, in the experimentation, can make brake motor 2 reach dynamic balance back, draws pressure sensor 6 and can not receive extra power, prevents that brake motor 2 and test platform 1 self weight from producing the influence to detecting, has improved the accuracy of testing data.
It can be understood that support frame 3 is rectangular shape, and the top of support frame 3 is the closed angle 4 that two inclined planes formed, when test platform 1 not with draw pressure sensor 6 fixed, test platform 1 can use the contact line of support frame 3 and closed angle groove to swing as the axis on support frame 3, nevertheless can't remove about this axis, and the closed angle groove that the bottom of test platform 1 set up should be adapted with the closed angle 4 phase-match of support frame.
As another embodiment, the bottom end of the supporting frame 3 is fixed on the mounting platform 5, and the top end of the supporting frame 3 is connected with the bottom of the testing platform 1 through the rotating part, so that the testing platform 1 can swing within a certain angle by using the top end of the supporting frame 3 as a fulcrum, and similarly, the testing platform 1 can have a swing trend. In this embodiment, the specific type of the rotating member is not limited, and may be, for example, a rotating member such as a rotating shaft or a bearing.
In some examples, the two pull pressure sensors 6 may be symmetrically disposed on two sides of the supporting frame 3 and spaced from the central line of the testing platform 1. At this time, the tension and pressure sensor 6 may also be replaced by a pressure sensor or a tension sensor, that is, two pressure sensors or two tension sensors are respectively symmetrically arranged on two sides of the supporting frame 3 to detect the tension and pressure of the testing platform 1.
The top of test platform 1 is equipped with a plurality of spouts 10 that set up side by side, and a plurality of spouts 10 are distributed with test platform 1's central line symmetry for the ring flange 8 or the motor base of the brake motor 2 of fixed not unidimensional through fastener 9, and the central line of brake motor 2's main shaft and test platform 1's central line and the coincidence of the vertical central line of support frame 3, improved test platform 1's stability and the accuracy of data.
In some specific examples, when the test platform 1 is connected with the flange 8, the flange 8 is firstly connected with the test rack, and then the test rack is fixed on the test platform 1; when being connected with the motor base, the motor base is directly fixed on the test platform 1 without a test frame.
The concrete shape of the chute 10 is not limited, and in the embodiment of the present invention, the chute 10 is preferably T-shaped.
In this embodiment, the fasteners 9 are bolts.
As shown in fig. 3, draw pressure sensor 6's top to be equipped with coupling assembling, coupling assembling includes first connector 11, second connector 12 and tapered pin axle 13, and wherein, first connector 11 and second connector 12 are T type connecting plate and relative setting respectively, and are specific: the horizontal part of the first connecting body 11 is fixedly connected with the bottom of the test platform 1, the horizontal part of the second connecting body 12 is fixedly connected with the pull pressure sensor 6, and the conical pin shaft 13 sequentially penetrates through the conical pin shaft hole in the vertical part of the first connecting body 11 and the conical pin shaft hole in the vertical part of the second connecting body 12 and is fastened through the nut 14.
It should be noted that, in the conventional bolt or pin connection mode, a cylindrical bolt or pin is used for connection, and a gap is formed between the cylindrical bolt or pin and the hole wall of the connecting piece, so that the force transmission effect is poor.
In addition, as shown in fig. 1, the testing device of the present invention further includes an inertia disc 15, the inertia disc 15 is connected to the rotating shaft of the brake motor 2 through a coupling 16, so as to increase the rotational inertia of the brake motor 2, prolong the braking time, and facilitate the pull pressure sensor to measure the variation process of the braking torque applied to the brake motor from the time when the brake motor receives a braking command to start braking to the time when the brake motor finally stops completely.
As shown in fig. 1 and 2, the mounting platform 5 is provided with a plurality of grooves 17 arranged in parallel, and the support frame 3 and the sensor support 7 are respectively fixed in the grooves 17 by bolts, and in this embodiment, the grooves 17 are preferably T-shaped.
The testing device also comprises two balance supports 18, the two balance supports 18 are respectively symmetrically positioned at two sides of the support frame 3, the balance supports 18 are movably arranged in the groove 17, in the testing process, the balance supports 18 are removed, the testing platform 1 is pressed on the pull pressure sensor 6, after the detection is finished, the balance supports 18 are moved to the position below the testing platform 1 to support the testing platform 1 to keep balance, and the pull pressure sensor 6 can be further protected.
The following describes a testing method of the testing device for the dynamic braking torque of the brake motor provided by the invention, and the testing method described below and the testing device described above can be referred to correspondingly.
As shown in fig. 4, the testing method of the testing device for the dynamic braking torque of the braking motor of the invention mainly comprises the following steps:
s1: and controlling the brake motor 2 to reach a stable rotation state.
During testing, the brake motor 2 is arranged in the middle of the test platform 1, the central line of the main shaft of the brake motor 2 is overlapped with the central line of the test platform 1, the brake motor 2 is controlled to be started and reach a stable rotation state, and at the moment, the pulling pressure sensor 6 can record the pulling pressure change condition exerted on the test platform 1 by the brake motor 2.
S2: the stable rotation torque is obtained by pulling the pressure sensor 6 and is calibrated as a zero point.
After the brake motor 2 enters stable operation, the test platform 1 can enter a dynamic balance state, at the moment, the pulling pressure measured by the pulling pressure sensor 6 is a stable numerical value, the stable numerical value is marked as a zero point through a peeling function set by the control processor, and then the brake torque is detected, so that the influence of other external forces on the detection result is prevented.
S3: and controlling the brake motor 2 to brake into an inertial rotation state.
And controlling the brake motor 2 to be powered off, wherein the brake motor 2 loses power and enters inertial rotation, and after the brake loses power, the brake disc is pushed out by the brake spring and clings to the motor rotor to realize motor braking.
S4: the dynamic braking torque is obtained by pulling the pressure sensor 6.
In this process, the rotor of the brake motor 2 can be regarded as a rotating component, and since the stator, the brake and other components of the brake motor 2 are rigidly connected with the test platform 1, these components are regarded as a whole and are collectively called as stationary components for convenience of description. During braking of the motor, the stationary component interacts with the rotor and generates a torque (moment) of the same magnitude and opposite direction as the rotor, causing the rotor to stall. Because test platform 1, support frame 3, the rigid connection mode who draws pressure sensor 6 and sensor support 7 for this moment is provided by drawing pressure sensor 6 and sensor support 7 department, and is specific: the rotating torque generated by the brake motor 2 in the braking process can be completely transmitted to the test platform 1, and the test platform 1 tends to swing by taking the support frame 3 as a fulcrum. Therefore, during the braking process, the change of the dynamic braking torque of the braking motor 2 can be measured by the tension and pressure sensor 6, and it can be understood that the torque is the product of the force and the moment arm, and the size of the moment arm is only related to the relevant dimension of the test platform 1, namely, the distance between the tension and pressure sensor 6 and the central line of the test platform 1 can be regarded as a fixed coefficient.
Therefore, the testing method is high in accuracy, can measure the change process of the braking torque of the motor in the process from the braking command received by the braking motor to the final complete stop of the operation in real time, and has important practical significance for a user in guiding the practical work.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. A brake motor dynamic braking torque testing apparatus, comprising:
the test platform is used for fixing the brake motor;
the bottom end of the supporting frame is fixed on the mounting platform, the top end of the supporting frame is provided with the test platform, and the test platform can swing by taking the supporting frame as a fulcrum;
the bottom of the tension and pressure sensor is fixedly connected with the mounting platform through a sensor bracket, and the top of the tension and pressure sensor is fixedly connected with the bottom of the test platform;
the top end of the supporting frame is connected with the bottom of the test platform through a rotating piece;
draw pressure sensor's top to be equipped with coupling assembling, coupling assembling includes first connector, second connector and toper round pin axle, first connector with test platform's bottom links to each other, the second connector with draw pressure sensor and link to each other, the toper round pin axle runs through first connector and second connector pass through the nut fastening.
2. The device for testing the dynamic braking torque of the brake motor according to claim 1, wherein two pull pressure sensors are arranged on two sides of the support frame symmetrically.
3. The device for testing the dynamic braking torque of the brake motor according to claim 1, wherein the brake motor is connected with the sliding groove at the top of the test platform through a fastener, and the center line of the brake motor is coincident with the center line of the test platform.
4. The device for testing the dynamic braking torque of the brake motor according to claim 1, further comprising a signal amplifier, a data collector and a control processor, wherein the signal amplifier is connected with the pull pressure sensor, the data collector is connected with the signal amplifier, and the control processor is respectively connected with the data collector and the brake motor.
5. The device for testing the dynamic braking torque of the brake motor according to claim 1, further comprising an inertia disc and a balance bracket, wherein the inertia disc is connected with a rotating shaft of the brake motor through a coupler; the two balance supports are symmetrically arranged on two sides of the support frame respectively and movably arranged on the mounting platform and used for supporting the test platform.
6. A method for testing a device for testing the dynamic braking torque of a brake motor according to any one of claims 1 to 5, comprising:
controlling a brake motor to reach a stable rotation state;
acquiring a stable rotation moment through a pull pressure sensor, and marking the stable rotation moment as a zero point;
controlling a brake motor to brake to enter an inertial rotation state;
and acquiring dynamic braking torque through a pull pressure sensor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110220838.1A CN113008437B (en) | 2021-02-26 | 2021-02-26 | Device and method for testing dynamic braking torque of brake motor |
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| CN202110220838.1A CN113008437B (en) | 2021-02-26 | 2021-02-26 | Device and method for testing dynamic braking torque of brake motor |
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| CN113008437B true CN113008437B (en) | 2023-02-28 |
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2021
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| JPH10170359A (en) * | 1996-12-10 | 1998-06-26 | Mitsubishi Electric Corp | Dynamometer |
| CN2369235Y (en) * | 1998-10-08 | 2000-03-15 | 王曰进 | Tester for micro-torque motor |
| CN105738133A (en) * | 2016-05-04 | 2016-07-06 | 中国铁道科学研究院 | Rail vehicle multifunctional braking power testing platform |
| CN106441828A (en) * | 2016-08-13 | 2017-02-22 | 安徽合力股份有限公司 | Brake testing stand |
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