CN110208117B - Hammering device, system and method for analyzing dynamic characteristics of stator winding end part of large phase modulator - Google Patents
Hammering device, system and method for analyzing dynamic characteristics of stator winding end part of large phase modulator Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
- G01N3/307—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight generated by a compressed or tensile-stressed spring; generated by pneumatic or hydraulic means
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
A hammering device, a system and a method for analyzing the dynamic characteristics of the end part of a stator winding of a large phase modulator are provided, wherein the hammering device is characterized by comprising a test hammer, the test hammer is also provided with a fixed clamping seat, and two opposite sides of the fixed clamping seat are respectively provided with a movable clamping tongue; the testing hammer moves in a track formed by two arc-shaped rods which are oppositely arranged, electromagnets are respectively embedded in the opposite positions of the inner side surfaces of the two arc-shaped rods, and the electromagnets and the inner side surfaces of the arc-shaped tracks are in the same plane; when the detection and control circuit detects that the test hammer falls down, the electromagnet is controlled to be electrified, and the movable clamping tongues positioned on two sides of the fixed clamping seat attract the test hammer to move upwards after rebounding, and fix the test hammer. This disclosed hammering device utilizes detection and control circuit to realize springing up the after-fixing after the test hammer hammering test once, avoids the secondary whereabouts, guarantees the measuring precision.
Description
Technical Field
The disclosure relates to the technical field of testing, in particular to a hammering device, a hammering system and a hammering method for analyzing dynamic characteristics of a stator winding end part of a large phase modulator.
Background
In order to examine whether the dynamic characteristics of the end part of the stator winding of the large phase modulator engineering unit meet the standard requirements, the dynamic characteristics of the end part of the stator winding of a single unit are required to be tested.
In the test for analyzing the dynamic characteristics of the stator winding end of the large phase modulator, the traditional test method adopts manual hammering to generate an excitation signal. However, the manual hammering excitation force is not fixed, the working effect is different from person to person, the fatigue of people is easy to occur after the test time is long, and the test efficiency is influenced.
Disclosure of Invention
The purpose of this description implementation mode is to provide large-scale phase modifier stator winding tip dynamic characteristic analysis hammering device, adopts automated control technique to realize the control to the hammer, guarantees that the hammering effect at every turn is unanimous, and the effect is controllable, reduces personnel's work operation work load.
The embodiment of the specification provides a hammering device for analyzing the dynamic characteristics of the stator winding end part of a large phase modulator, which is realized by the following technical scheme:
the method comprises the following steps:
the testing hammer is also provided with a fixed clamping seat, and two opposite sides of the fixed clamping seat are respectively provided with a movable clamping tongue;
the testing hammer moves in a track formed by two arc-shaped rods which are oppositely arranged, electromagnets are respectively embedded in the opposite positions of the inner side surfaces of the two arc-shaped rods, and the electromagnets and the inner side surfaces of the arc-shaped tracks are in the same plane;
when the detection and control circuit detects that the test hammer falls down, the electromagnet is controlled to be electrified, and the movable clamping tongues positioned on two sides of the fixed clamping seat attract the test hammer to move upwards after rebounding, and fix the test hammer.
The embodiment of the specification provides a working method of a hammering device for analyzing dynamic characteristics of a stator winding end part of a large phase modulator, which is characterized by comprising the following steps of:
the testing hammer is pulled along the hammer handle hinge for a certain angle, and the torsion spring stores energy;
loosening the testing hammer, and allowing the testing hammer to fall under the driving of the torsion spring;
after knocking, the testing hammer bounces, when the movable clamping tongue passes through the electromagnet, the electromagnet acts to suck out the movable clamping tongues arranged on the two sides of the fixed clamping seat;
the movable clamping tongue and the electromagnet are clamped together, the testing hammer is locked to move downwards, and single falling and fixed torque knocking of the testing hammer are achieved.
An embodiment of the present specification provides a hammering system for analyzing dynamic characteristics of a stator winding end of a large phase modulator, comprising a hammering device according to any one of claims 108, a multifunctional signal conditioner and an upper computer, wherein a force sensor is installed at a testing end of the testing hammer, a signal measured by the force sensor is transmitted to the multifunctional signal conditioner for signal processing, and the multifunctional signal conditioner transmits the processed signal to the upper computer for analysis.
The hammering device can realize locking after the test hammer falls and bounces, and the process is automatically realized by circuit control.
Compared with the prior art, the beneficial effect of this disclosure is:
the hammering device disclosed utilizes the energy storage of the torsion spring, realizes the consistency of the size of the torsion of the hammer at every test, and is convenient for ensuring the testing precision.
This disclosed hammering device utilizes detection and control circuit to realize springing up the after-fixing after the test hammer hammering test once, avoids the secondary whereabouts, guarantees the measuring precision.
The fixing of the test hammer is realized by matching the electromagnet with the movable clamping tongue, the technical conception is ingenious, the technical realization is easy, the automatic detection and the automatic fixing are realized, the detection is accurate, and the fixing result is accurate.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.
FIG. 1 is a schematic diagram of a mechanical configuration of an embodiment of the present disclosure;
FIG. 2 is a schematic overall structure diagram of an embodiment of the present disclosure;
3(a) -3 (b) are schematic views of the use state of the embodiment of the disclosure;
FIG. 4 is a schematic diagram of a circuit control structure according to an embodiment of the disclosure;
FIGS. 5(a) -5 (b) are schematic diagrams illustrating a first set of measurements according to an embodiment of the disclosure;
6(a) -6 (b) are graphs illustrating a second set of measurements according to an example of the present disclosure;
fig. 7(a) -7 (b) are schematic diagrams illustrating a third set of measurement results according to an embodiment of the disclosure.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Example of implementation 1
Referring to fig. 1, 2, and 3(a) -3 (b), in a typical embodiment, a hammering device for analyzing dynamic characteristics of a stator winding end of a large phase modulator is disclosed, which includes a testing hammer, the testing hammer includes a hammer head and a hammer handle, one end of the hammer handle is connected to the hammer head, the other end is connected to a base through a hinge mechanism, the base is fixed on a bottom plate, a torsion spring is arranged between the hinge mechanism and the hammer handle, a fixed clamping seat is further arranged on the hammer handle near one end of the hammer head, and movable clamping tongues are respectively arranged on two opposite sides of the fixed clamping seat.
The testing hammer moves in two arc poles (guide rails) which are arranged oppositely, the arc poles which are arranged oppositely form an arc track on which the testing hammer moves, one ends of the two arc poles are fixed on the bottom plate, the other ends of the two arc track poles are connected through the cross beam, electromagnets are embedded into the opposite positions of the inner side surfaces of the two arc poles respectively, and the electromagnets and the inner side surfaces of the arc tracks are in the same plane.
In one embodiment, a hole is formed in the position of the bottom plate where the test hammer falls, the hole is slightly larger than the diameter of the hammer head of the test hammer, and the hammer head falls on the end part of the stator winding of the large phase modulator to be tested by using the hole.
In one embodiment, a photoelectric switch is arranged in the middle of the electromagnet, scales are arranged on one or two arc-shaped rods, and the maximum position and the minimum position of the torsion of the drop hammer of the test hammer are marked.
In one embodiment, a rubber pad is arranged at one end of the hammer head knocking test.
In an embodiment, the basic method steps of the test of the hammering system for analyzing the dynamic characteristics of the stator winding end of the large phase modulator are as follows:
the testing hammer is pulled to a certain angle along the hammer handle hinge, and the torsion spring stores energy. The process of pulling the test hammer along the hammer handle hinge for a certain angle can be manually realized, and the process can also be realized by a manipulator through a control device.
And (4) loosening the hand, and enabling the testing hammer to fall under the driving of the torsion spring.
After knocking, the testing hammer is bounced, and when the movable clamping tongues pass through the electromagnet, the electromagnet acts to suck out the movable clamping tongues arranged on the two sides of the fixed clamping seat.
The movable clamping tongue and the electromagnet are clamped together to lock the testing hammer to move downwards.
Through the test, the single falling of the test hammer and the fixed torsion knocking are realized. The hammer falls for a single time and is locked after being bounced.
In one embodiment, a control device is arranged at a position on the bottom plate, which does not influence the movement of the test hammer, and the control device comprises a shell and a detection and control circuit arranged in the shell. Referring to fig. 4, the detection and control circuit includes a drop hammer detection circuit, a delay locking circuit, an isolation comparison circuit, an output signal conditioning circuit, a reset circuit, and an electromagnet driving circuit.
The fixed clamping seat is arranged on the hammer handle, when the test hammer falls, the falling hammer detection circuit is used for detecting the falling of the test hammer, the detection signal is output to the delay locking circuit for delaying and then is output to the isolation comparison circuit to realize circuit isolation, the detection signal is output to the output signal conditioning circuit for conditioning the signal, the output voltage of the isolation comparison circuit is output to the electromagnet driving circuit in a positive jump mode to drive the relay to act, the electromagnet coil is powered on, and the attraction test hammer rebounds and then moves upwards to be located on the movable clamping tongues on the two sides of the fixed clamping seat to be fixed.
In a specific implementation example, the drop hammer detection circuit comprises a photoelectric switch arranged in the middle of the electromagnet and a phototriode Q1 working in cooperation with the photoelectric switch, wherein an emitter of the phototriode Q1 is grounded, a collector is divided into two paths, one path is connected to a resistor R1, and the other path is connected to a latch U1A.
When the testing hammer works, when the testing hammer falls down, light in the photoelectric switch is shielded and is switched on, the phototriode Q1 is cut off, the collector of the phototriode Q1 jumps to be at a high level under the action of the pull-up resistor R1, and after signal processing of the latch U1A, the collector jumps to be at a low level.
And after the output step of the drop hammer detection circuit is low level, a low level signal is output to the delay locking circuit.
In this embodiment, the delay locked circuit includes: the circuit comprises a first branch circuit and a second branch circuit which are connected in parallel, wherein the first branch circuit comprises a resistor R2, a resistor R3 and a capacitor C1 which are connected in series, the second branch circuit comprises a resistor R4, a triode Q2 and a triode Q3 which are connected in series, and the output end of a latch U1A of the drop hammer detection circuit is connected to a line between the resistor R2 and the resistor R3 of the first branch circuit.
In operation, when the drop hammer detection circuit output is stepped to a low level, the capacitor C1 discharges at a constant rate through the resistor R3. The capacitor voltage is the output voltage of the delay locking circuit.
The delay locking circuit is connected with an isolation comparison circuit, wherein the isolation comparison circuit comprises an amplifier U2A connected with one end of a capacitor of the delay locking circuit, a voltage follower circuit formed by an amplifier U2A follows the output voltage of the capacitor of the delay locking circuit, the output end of the amplifier U2A is connected with the negative electrode end of the amplifier U2B, the isolation comparison circuit further comprises a third branch circuit which comprises a resistor R5 and a voltage stabilizing diode D2 which are connected in series, and the positive electrode end of the amplifier U2B is connected on a line between the resistor R5 and the voltage stabilizing diode D2.
During operation, the output voltage of the delay locking circuit is isolated by a voltage follower circuit formed by an amplifier U2A in the isolation comparison circuit, and then is compared with the voltage of a voltage stabilizing diode D2 by an amplifier U2B. When the hammer handle falls to block the light of the photodiode D1, the U1A in the falling hammer detection circuit outputs low level, the capacitor C1 discharges gradually through the R3, the voltage is reduced along with the low level, when the voltage is lower than the voltage of the voltage stabilizing diode D2, the voltage of the same-direction input end of the operational amplifier U2B in the isolation comparison circuit is higher than that of the reverse-direction input end, and the output voltage jumps forward. The isolation comparison circuit outputs a voltage positive jump signal to the output signal conditioning circuit.
The output signal conditioning circuit comprises a latch U1B connected with the output end of an amplifier U2B of the isolation comparison circuit, and a latch U1B is sequentially connected with a latch U1C;
when the electromagnetic driving circuit works, the positive jump signal of the voltage output by the isolation comparison circuit passes through the latch U1B and the latch U1C in the output signal conditioning circuit, and after the latches are turned over twice, the positive jump signal of the voltage output by the isolation comparison circuit is output to the electromagnetic driving circuit.
The electromagnet driving circuit comprises a photoelectric coupler U3, the input end of the photoelectric coupler U3 is connected to the public end of a resistor R8 and a resistor R6R7 respectively, the output end of the photoelectric coupler U3 is connected to a relay coil, two ends of the relay coil are reversely connected with a diode D3 in parallel, one end of a normally open contact of the relay is grounded, and the other end of the normally open contact of the relay is connected with an electromagnet coil L1 and a diode D4 which are connected in parallel in series.
When the circuit works, the high level generated by the output signal conditioning circuit U1C acts on the base electrodes of the triodes Q2 and Q3 through the R6. The high level makes Q3 turn on, and Q3 collector and electric capacity C1 are clamped at the low level, that is to say the delay locked circuit output voltage is pulled low, and is consistent with the state when triggering, form the auto-lock. Under the condition, after the hammer handle passes through the phototriode D1 and in the process of rebounding, the output voltage of the U1A in the drop hammer detection circuit changes from a high level to a low level, and the low level of the capacitor C1 is not influenced by the output voltage of the U1A because the Q3 is in a conducting state. In the figure, Vlock _ in is a symbol representing the same net (interconnection) in one circuit. Two points Vlock in indicate connectivity.
The high level generated by the output signal conditioning circuit drives a relay coil through a photoelectric coupler U3, and a normally open contact of the relay is closed. An electromagnet coil L1 embedded in the arc-shaped rod is electrified, attracts and pulls the movable clamping tongue which moves upwards after rebounding, and fixes the movable clamping tongue.
During the test next time, utilize reset circuit to realize resetting, specifically, reset circuit include reset switch and with reset switch parallelly connected electric capacity C2, reset switch and electric capacity C2's common terminal is connected to the one end of resistance R6, the other end of resistance R6 is connected to the one end of resistance R7, the other end ground connection of resistance R7.
When the switch works, the reset key K1 is pressed, the base electrodes of the triodes Q2 and Q3 are changed into low level, the capacitor C2 absorbs fluctuation pulse when the key K1 operates, and the operation stability is improved. In the time delay locking circuit, Q2 is switched on, Q3 is switched off, a capacitor C1 recovers high level, locking is reset, and the electromagnet is demagnetized. The pull-up capability of the triode Q2 is reduced by the series resistor R4, the triode Q3 is pulled down strongly after being turned on, and the time delay locking circuit is locked only when the base electrodes of the triodes Q2 and Q3 are at high level through the matching of the resistor R4 and the resistor R3.
The test hammer is pulled back again, and the test can be carried out again.
Example II
The embodiment discloses a dynamic characteristic analysis hammering system for a stator winding end part of a large phase modulator, which comprises the hammering device, wherein a force sensor is arranged on the hammer head of the testing hammer, a signal measured by the force sensor is transmitted to a multifunctional signal conditioner, the multifunctional signal conditioner is connected with a notebook computer, and the multifunctional signal conditioner is used for processing the measured hammering force and transmitting the processed hammering force to the notebook computer or an upper computer for processing or displaying.
Engineering example one
In order to make the technical solutions of the present disclosure more clearly understood by those skilled in the art, the technical solutions of the present disclosure will be described in detail below with reference to specific examples and comparative examples.
In order to examine whether the dynamic characteristics of the stator winding end parts of the 300Mvar 1 and No. 2 machine sets of the tin Union +/-800 kV converter station additionally-installed phase modifier project meet the standard requirements or not, the dynamic characteristics of the stator winding end parts of a single machine set are tested. The test object is a phase modulator 300Mvar set stator winding.
The instrument configuration used in the experiment is shown in table 1.
Table 1 main equipment table for test
During testing, the force sensor can be arranged on the hammer head of the testing hammer to detect the knocking stress and the knocking transient acceleration. And (5) monitoring the test environment of the hygrothermograph.
The test system comprises a test hammer, a force sensor and a signal processing system.
The test adopts a hammering method to measure the dynamic characteristics, and adopts a multi-point excitation and single-point response method. And hammering the position of a measuring point at the end part of the stator winding by using a hammer, and measuring the acceleration response of the stator winding by using an acceleration sensor. The force signal and the acceleration signal are amplified by the amplifier and sent to the dynamic signal analyzer for analysis, and a frequency response function of the structure can be obtained.
The torsion spring is used for driving the testing hammer to fall down,
the hammer is locked in a bouncing mode, wherein the locking is to prevent the knocking hammer from bouncing up and then falling down again, and the knocking hammer is designed to be capable of bouncing up and then falling down.
And measuring the mode of the end part in a circle, wherein the number of the measuring points is half of the number of the stator slots, and measuring points are taken every other line bar.
The test conditions are as follows:
the modal test analysis of the end part of the stator winding is carried out at room temperature;
when the phase modifier is in a stop state, the rotor is not arranged in the stator chamber, and the stator part is completely cleaned;
numbering corresponding windings at the end part according to the number of the slot where the upper-layer wire rod of the stator is positioned:
the phase modifier body has no other operation;
and removing cover plates at two ends of the phase modifier stator.
The test steps are as follows:
the dynamic characteristics of the test were measured by the hammering method. And hammering the position of a measuring point at the end part of the stator winding by using a hammer, and measuring the acceleration response of the stator winding by using an acceleration sensor. The force signal and the acceleration signal are amplified by the amplifier and sent to the dynamic signal analyzer for analysis, and a frequency response function of the structure is obtained.
Further analyzing and fitting the obtained frequency response function by using proper modal analysis software to obtain modal parameters, and measuring the following parameters:
1. the natural frequency of the stator winding end phase lead and the main lead is in hertz (Hz);
2. the overall elliptical mode vibration mode and the four-lobe mode vibration mode of the end part of the stator winding are adopted;
3. the unit of the response ratio corresponding to the natural frequency of the frequency response function of the stator winding end and the lead wire origin is as follows: (m/s 2)/N.
Test judgment Standard
The frequency range that the integral elliptic vibration mode natural frequency of the stator end winding should avoid: 95Hz to 110 Hz;
frequency range that the stator end winding lead natural frequency should avoid: 95Hz to 108 Hz.
For the measuring point with the lead natural frequency not meeting the requirements, the original point response ratio of the measuring point is measured, and the measuring method of the response ratio is detailed in the related requirements in GB/T20140-2016 < measuring method and evaluation method of the dynamic characteristics of the stator winding end of the non-salient pole synchronous phase modulator >. The evaluation criterion of the response ratio is that the measured response ratio is not more than 0.44 (m/s) in the frequency range needing to be avoided2) and/N. For response ratio less than 0.44 (m/s)2) the/N measurement point may be left untreated. For a response ratio greater than or equal to 0.44 (m/s)2) And the/N measuring point should be bound and reinforced as much as possible by taking measures.
When the natural frequency of the lead is not significant or difficult to determine, the maximum response ratio in the frequency range to be avoided should be measured, and the evaluation criteria and processing method are the same as those described above.
If the integral vibration mode natural frequency of the stator winding end does not meet the requirement, the end is measuredEach bar radial origin response ratio. For response ratio less than 0.44 (m/s)2) the/N measurement point may be left untreated. For a response ratio greater than or equal to 0.44 (m/s)2) And a measuring point of/N, which is suggested to measure the vibration of the stator winding end in operation, and the evaluation criterion is detailed in GB/T20140-.
The acceleration sensor is firmly fixed on the end part of the winding in the 6 o' clock direction by using fireproof mud (or medical adhesive tape);
when the end part mode is measured, the hammering direction is radial, and when the natural frequency of the outgoing line is measured, the hammering direction is radial and axial tangential;
continuously measuring each measuring point for 4 times and taking an average value;
the action is crisp during hammering, and the repeatability of an excitation signal is good;
when the operation test is carried out on the springboard, the hammer is prevented from falling and being damaged besides paying attention to personal safety;
care should be taken to protect the stator end structure during testing:
the tested equipment and other equipment do not have any electrical connection;
and (3) finishing the test, checking whether tools, wires and the like are left on the tested equipment: all the carrying tools are registered when entering the stator chamber, and all the registering tools are confirmed to be taken out when coming out: the personnel entering the stator chamber need to wear professional work clothes without metal buttons and zippers and wear soft-bottom work shoes;
when the phase modifier works, other operations of the phase modifier body are stopped.
The test mainly concerns the modal shape of a 95 Hz-110 Hz frequency band, so that a correlation function in an 80 Hz-120 Hz range must approach to 1, the hammering force and direction of three times of hammering tend to be more consistent and better during measurement (each test point needs to be hammered for three times to obtain a value), and during actual measurement, each point has no effect on repeated hammering measurement due to poor knocking repeatability, so that the end characteristic test has high requirements on hammer hammering.
In the above three sets of measurement results, fig. 5(a) -5 (b) are the first set of measurement results, fig. 6(a) -6 (b) are the second set of measurement results, and fig. 7(a) -7 (b) are the third set of measurement results, wherein the first and second sets of measurement data are valid, the third set of measurement data is invalid, and the third set of measurement data is the correlation function difference between 80Hz and 120 Hz.
It is to be understood that throughout the description of the present specification, reference to the term "one embodiment", "another embodiment", "other embodiments", or "first through nth embodiments", etc., is intended to mean 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 present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, or materials described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (9)
1. A hammering device for analyzing the dynamic characteristics of the end part of a stator winding of a large phase modulator is characterized by comprising a test hammer, wherein a fixed clamping seat is also arranged on the test hammer, and movable clamping tongues are respectively arranged on two opposite sides of the fixed clamping seat;
the testing hammer moves in a track formed by two arc-shaped rods which are oppositely arranged, electromagnets are respectively embedded in the opposite positions of the inner side surfaces of the two arc-shaped rods, and the electromagnets and the inner side surfaces of the arc-shaped tracks are in the same plane;
when the detection and control circuit detects that the test hammer falls, the electromagnet is controlled to be electrified, and the movable clamping tongues positioned at the two sides of the fixed clamping seat attract the test hammer to rebound and then move upwards to fix the test hammer;
the detection and control circuit comprises a drop hammer detection circuit, a delay locking circuit, an isolation comparison circuit, an output signal conditioning circuit, a reset circuit and an electromagnet driving circuit;
when the test hammer falls, the falling hammer detection circuit is used for detecting the falling of the test hammer, the detection signal is output to the delay locking circuit to be delayed and then output to the isolation comparison circuit, the circuit isolation is realized, then the detection signal is output to the output signal conditioning circuit to condition the signal, the output voltage of the isolation comparison circuit is positively jumped and then output to the electromagnet driving circuit, the relay is driven to act, then the electromagnet coil is powered on, and the attraction test hammer rebounds and then moves upwards to be positioned on the movable clamping tongues on two sides of the fixed clamping seat and is fixed.
2. The large-scale phase modifier stator winding end dynamic characteristic analysis hammering device according to claim 1, characterized in that, the test hammer comprises a hammer head and a hammer handle, one end of the hammer handle is connected with the hammer head, the other end is connected with the base through a hinge mechanism, and a fixed clamping seat is arranged on the hammer handle close to one end of the hammer head.
3. The large phase modulator stator winding end dynamics analysis hammer apparatus according to claim 2, wherein the base is fixed to the base plate, and a torsion spring is provided between the hinge mechanism and the hammer handle.
4. The hammering device for analyzing dynamic characteristics of stator winding end portions of large-scale phase modulators as claimed in claim 2, wherein one ends of the two arc-shaped rods are fixed to the base plate, and the other ends of the two arc-shaped rail rods are connected through a cross beam.
5. The hammering device for analyzing dynamic characteristics of stator winding end of large-scale phase modulator according to claim 1, characterized in that a photoelectric switch is arranged at the middle position of the electromagnet, and a scale is arranged on one or two arc-shaped rods, and the maximum position and the minimum position of the movement of the test hammer are marked.
6. The hammering device for analyzing dynamic characteristics of stator winding end of large phase modulator as claimed in claim 1, wherein the position of the bottom plate where the testing hammer falls is provided with a hole, the hole is slightly larger than the diameter of the hammer head of the testing hammer, and the hammer head falls on the stator winding end of large phase modulator to be tested by using the hole.
7. The large phase modulator stator winding end dynamic behavior analysis hammering device as claimed in claim 1, wherein one end of the hammer head hammering test is provided with a rubber pad.
8. A method of operating a large phase modulator stator winding overhang dynamics analysis hammering apparatus as claimed in any one of claims 1 to 7, comprising:
the testing hammer is pulled along the hammer handle hinge for a certain angle, and the torsion spring stores energy;
loosening the testing hammer, and allowing the testing hammer to fall under the driving of the torsion spring;
after knocking, the testing hammer bounces, when the movable clamping tongue passes through the electromagnet, the electromagnet acts to suck out the movable clamping tongues arranged on the two sides of the fixed clamping seat;
the movable clamping tongue and the electromagnet are clamped together, the testing hammer is locked to move downwards, and single falling and fixed torque knocking of the testing hammer are achieved.
9. A hammering system for analyzing the dynamic characteristics of the stator winding end of a large phase modulator is characterized by comprising a hammering device, a multifunctional signal conditioner and an upper computer, wherein a force sensor is installed at the testing end of a testing hammer, signals measured by the force sensor are transmitted to the multifunctional signal conditioner for signal processing, and the processed signals are transmitted to the upper computer by the multifunctional signal conditioner for analysis.
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| CN108760537A (en) * | 2018-05-27 | 2018-11-06 | 山西大学 | A kind of large size drop impact device |
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| EP0044093A1 (en) * | 1980-07-15 | 1982-01-20 | BBC Brown Boveri AG | Method for testing the quality of the fixing of windings in the slots of a statorof a dynamo-electric machine |
| CN206848088U (en) * | 2017-06-07 | 2018-01-05 | 绍兴市容纳测控技术有限公司 | Drop hammer impact testing machine |
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