CN203502186U - Apparatus for measuring mechanical impedance of heald frame - Google Patents
Apparatus for measuring mechanical impedance of heald frame Download PDFInfo
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- CN203502186U CN203502186U CN201320476929.2U CN201320476929U CN203502186U CN 203502186 U CN203502186 U CN 203502186U CN 201320476929 U CN201320476929 U CN 201320476929U CN 203502186 U CN203502186 U CN 203502186U
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- heald frame
- mechanical impedance
- impedance measurement
- signal analyzer
- acceleration
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Abstract
The invention discloses an apparatus for measuring mechanical impedance of a heald frame. The apparatus comprises a test heald frame, a heald frame acceleration impedance measuring device and a heald frame displacement impedance measuring device. A method of using the apparatus comprises the following steps: determining the position of a mechanical impedance measuring point on the test heald frame; arranging an acceleration sensor and a displacement sensor on the other side of a beam cross section of the mechanical impedance measuring point; generating a pseudo-random signal by a signal generator so that a force hammer strikes the mechanical impedance measuring point to cause vibration of the test heald frame; generating a response signal and a force application signal after the vibration is transferred to the acceleration sensor, the displacement sensor and a force sensor; inputting the signals to a signal analyzer through a load amplifier and a charge amplifier; and displaying an acceleration impedance curve and a displacement impedance curve through FFT (Fast Fourier Transform) analysis. According to the utility model, the design parameters of a damper vibration absorber arranged on a measuring inner cavity wall of the heald frame are determined by measuring the relationship of quality, damping and mechanical impedance of the vibration absorber, so that the dynamic stiffness of the heald frame is improved, and transverse vibration of the heald frame is prevented.
Description
Technical field
The utility model belongs to air-jet loom field, is specifically related to a kind of measurement mechanism of heald frame mechanical impedance, is applied in the heald frame dynamic parameter measurement technology of shedding mechanism.
Background technology
Open loop system is the highest parts of loom defects rate, there is various dynamic performance problems in heald frame, trace it to its cause, the vibration of heald frame is relevant with operating frequency, heald frame operates in resonance zone, and the rigidity of heald frame and damping characteristic become no good, the diminish power that means that just a little, please of dynamic stiffness, heald frame just produces the very large displacement of amplitude, and vibration is violent.Along with the raising of loom speed, the former rank of loom operating frequency and heald frame model frequency is overlapping, and heald frame is reciprocating, and crossbeam has one section of quiescent phase in minimum and extreme higher position, lift or fall journey finish after heald frame crossbeam high vibration.
The mechanical part running up must be lightweight, and dynamic loading size is proportional to component weight, and heald frame must adopt light material, but lightweight parts amplitude is large when vibration, so vibration damping is the major issue of heald frame design.The main body of heald frame weight is crossbeam, and heald frame is the another part of flat frame clsss, and in the flat thin direction strong vibration of heald frame, it is submissive that crossbeam becomes, and for the light crossbeam of quality, little load produces large deformation, and distortion is not in the direction of motion of heald frame.
Heald frame does not gently allow and shakes again, improves the dynamic stiffness of heald frame, prevents that the horizontal of heald frame from shaking, and uses damping absorber, makes great efforts to control initial a few valency mode of heald frame, controls several valence vibrations overlapping with loom operating frequency.Crossbeam is the aluminium alloy extrusions of hollow, and internal chamber wall attenuation, arranges bump leveller at internal chamber wall.In the max bend position of initial a few valency mode, bump leveller is installed, is just required to determine the design parameter of bump leveller, determine the wall thickness of heald frame inner chamber.The effect of damping absorber is the amplitude while reducing resonance, and when heald frame operates in deviation resonance rotating speed when far away, damping effect is just poor, and this is just being applicable to the needs of heald frame.By mechanical impedance measuring method, can measure needed mechanical parameter, and record the effect of using damping absorber.
Crossbeam is the weak link of system, and solution is the flexibility that increases crossbeam, and relatively submissive crossbeam easily produces vibration, does not allow again heald frame shake.Therefore must know the dynamic parameter of system, by the dynamic performance parameters of thermometrically heald frame, measure the dynamic characteristic after controlling heald frame vibration.
Utility model content
In order to solve the problems of the technologies described above, measure the dynamic parameter of open loop system, the utility model has aimed to provide a kind of measurement mechanism of heald frame mechanical impedance, by firmly hammering fixed point excitation heald frame into shape, displacement impedance and the acceleration impedance of with displacement transducer and acceleration transducer, measuring heald frame, and at heald frame response point sticking Quality piece and damping layer, measure the relation of bump leveller quality, damping and mechanical impedance.
For realizing above-mentioned technical purpose, reach above-mentioned technique effect, the utility model is achieved through the following technical solutions:
A measurement mechanism for heald frame mechanical impedance, comprises test heald frame and heald frame acceleration impedance measurement device and heald frame displacement impedance measurement mechanism that two rubber ropes of a use hang;
On the lower and upper cross-member of described test heald frame, be distributed with accordingly respectively 5 mechanical impedance measurement points, it is distributed in respectively the mid point of described lower and upper cross-member, apart from about mid point 2 of each 1/4th crossbeam length and apart from crossbeam two ends 2 points of 1/5th crossbeam length;
Described heald frame acceleration impedance measurement device comprises that one hammers, is arranged on the upper power sensor of described power hammer and load amplifier, acceleration transducer, charge amplifier and signal analyzer into shape for knocking the power of described mechanical impedance measurement point; Described acceleration transducer is corresponding one by one with described mechanical impedance measurement point, described acceleration transducer is arranged on the opposite side of described mechanical impedance measurement point crossbeam section, described power sensor is connected with described signal analyzer with described load amplifier by described charge amplifier respectively with described acceleration transducer, described signal analyzer is connected with a display screen, and the signal generator in described signal analyzer and described power sensor are connected;
Described heald frame displacement impedance measurement mechanism comprise one for knock described mechanical impedance measurement point described power hammer, be arranged on described power and hammer the above power sensor and transmitter, displacement transducer, described charge amplifier and described signal analyzer into shape; Described displacement transducer is corresponding one by one with described mechanical impedance measurement point, described displacement transducer is arranged on the opposite side of described mechanical impedance measurement point crossbeam section, described power sensor is connected with described signal analyzer with described transmitter by described charge amplifier respectively with described displacement transducer, described signal analyzer is connected with described display screen, and the described signal generator in described signal analyzer and described power sensor are connected.
Further, on described mechanical impedance measurement point, be stained with mass.
Further, between described mechanical impedance measurement point and described mass, be stained with a damping layer.
Further, described mass both sides be respectively stained with one described in damping layer.
The beneficial effects of the utility model are:
The utility model is by firmly hammering fixed point excitation heald frame into shape, displacement impedance and the acceleration impedance of with displacement transducer and acceleration transducer, measuring heald frame, and at heald frame response point sticking Quality piece and damping layer, measure the relation of bump leveller quality, damping and mechanical impedance.Thereby determine and be arranged on the design parameter that heald frame is weighed the damping absorber on internal chamber wall, and then increase the flexibility of crossbeam, improve the dynamic stiffness of heald frame, prevent that the horizontal of heald frame from shaking.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide further understanding of the present utility model, forms the application's a part, and schematic description and description of the present utility model is used for explaining the utility model, does not form improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the position view of the utility model mechanical impedance measurement point on test heald frame;
Fig. 2 is the framework schematic diagram of the utility model heald frame acceleration impedance measurement device;
Fig. 3 is the framework schematic diagram of the utility model heald frame displacement impedance measurement mechanism;
Fig. 4 a is that mechanical impedance measurement point of the present utility model is at the first embodiment schematic diagram of heald frame acceleration impedance measurement device;
Fig. 4 b is that mechanical impedance measurement point of the present utility model is at the second embodiment of heald frame acceleration impedance measurement device schematic diagram;
Fig. 4 c is that mechanical impedance measurement point of the present utility model is at the third embodiment schematic diagram of heald frame acceleration impedance measurement device;
Fig. 5 a is that mechanical impedance measurement point of the present utility model is at the first embodiment schematic diagram of heald frame displacement impedance measurement mechanism;
Fig. 5 b is that mechanical impedance measurement point of the present utility model is at the second embodiment of heald frame displacement impedance measurement mechanism schematic diagram;
Fig. 5 c is that mechanical impedance measurement point of the present utility model is at the third embodiment schematic diagram of heald frame displacement impedance measurement mechanism.
Embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the utility model in detail.
A measurement mechanism for heald frame mechanical impedance, comprises test heald frame 1 and heald frame acceleration impedance measurement device and heald frame displacement impedance measurement mechanism that two rubber ropes of a use hang;
Shown in Figure 1, on the lower and upper cross-member of described test heald frame 1, be distributed with accordingly respectively 5 mechanical impedance measurement points 2, it is distributed in respectively the mid point of described lower and upper cross-member, apart from about mid point 2 of each 1/4th crossbeam length and apart from crossbeam two ends 2 points of 1/5th crossbeam length;
Shown in Figure 2, described heald frame acceleration impedance measurement device comprise one for knock described mechanical impedance measurement point 2 power hammer 3, be arranged on power sensor 4 and load amplifier 5, acceleration transducer 6, charge amplifier 7 and signal analyzer 8 on described power hammer 3; Described acceleration transducer 6 is corresponding one by one with described mechanical impedance measurement point 2, described acceleration transducer 6 is arranged on the opposite side of described mechanical impedance measurement point 2 crossbeam sections, described power sensor 4 is connected with described signal analyzer 8 with described load amplifier 5 by described charge amplifier 7 respectively with described acceleration transducer 6, described signal analyzer 8 is connected with a display screen 9, and the signal generator 10 in described signal analyzer 8 is connected with described power sensor 4;
Shown in Figure 3, described heald frame displacement impedance measurement mechanism comprise one for knock described mechanical impedance measurement point 2 described power hammer 3, be arranged on described power hammer 3 the above power sensor 4 and transmitter 12, displacement transducer 11, described charge amplifier 7 and described signal analyzer 8; Described displacement transducer 11 is corresponding one by one with described mechanical impedance measurement point 2, described displacement transducer 11 is arranged on the opposite side of described mechanical impedance measurement point 2 crossbeam sections, described power sensor 4 is connected with described signal analyzer 8 with described transmitter 12 by described charge amplifier 7 respectively with described displacement transducer 11, described signal analyzer 8 is connected with described display screen 9, and the described signal generator 10 in described signal analyzer 8 is connected with described power sensor 4.
Further, shown in Fig. 4 a, 5a, on described mechanical impedance measurement point 2, be stained with mass 13.
Further, shown in Fig. 4 b, 5b, between described mechanical impedance measurement point 2 and described mass 13, be stained with a damping layer 14.
Further, shown in Fig. 4 c, 5c, described mass 13 both sides be respectively stained with one described in damping layer 14.
Above-described embodiment is just to allow one of ordinary skilled in the art can understand content of the present utility model and implement according to this for technical conceive of the present utility model and feature being described, its objective is, can not limit protection domain of the present utility model with this.Every equivalent variation or modification of having done according to the essence of the utility model content, all should be encompassed in protection domain of the present utility model.
Claims (4)
1. a measurement mechanism for heald frame mechanical impedance, is characterized in that: comprise test heald frame (1) and heald frame acceleration impedance measurement device and heald frame displacement impedance measurement mechanism that two rubber ropes of a use hang;
On the lower and upper cross-member of described test heald frame (1), be distributed with accordingly respectively 5 mechanical impedance measurement points (2), it is distributed in respectively the mid point of described lower and upper cross-member, apart from about mid point 2 of each 1/4th crossbeam length and apart from crossbeam two ends 2 points of 1/5th crossbeam length;
Described heald frame acceleration impedance measurement device comprise one for knock described mechanical impedance measurement point (2) power hammer (3), be arranged on the upper power sensor (4) of described power hammer (3), load amplifier (5), acceleration transducer (6), charge amplifier (7) and signal analyzer (8); Described acceleration transducer (6) is corresponding one by one with described mechanical impedance measurement point (2), and described acceleration transducer (6) is arranged on the opposite side of described mechanical impedance measurement point (2) crossbeam section, described power sensor (4)
By described charge amplifier (7), be connected with described signal analyzer (8) with described load amplifier (5) respectively with described acceleration transducer (6), described signal analyzer (8) is connected with a display screen (9), and the signal generator (10) in described signal analyzer (8) is connected with described power sensor (4);
Described heald frame displacement impedance measurement mechanism comprise one for knock described mechanical impedance measurement point (2) described power hammer (3), be arranged on described power hammer (3) the above power sensor (4), transmitter (12), displacement transducer (11), described charge amplifier (7) and described signal analyzer (8); Described displacement transducer (11) is corresponding one by one with described mechanical impedance measurement point (2), described displacement transducer (11) is arranged on the opposite side of described mechanical impedance measurement point (2) crossbeam section, described power sensor (4) is connected with described signal analyzer (8) with described transmitter (12) by described charge amplifier (7) respectively with described displacement transducer (11), described signal analyzer (8) is connected with described display screen (9), and the described signal generator (10) in described signal analyzer (8) is connected with described power sensor (4).
2. the measurement mechanism of heald frame mechanical impedance according to claim 1, is characterized in that: on described mechanical impedance measurement point (2), be stained with mass (13).
3. the measurement mechanism of heald frame mechanical impedance according to claim 2, is characterized in that: between described mechanical impedance measurement point (2) and described mass (13), be stained with a damping layer (14).
4. the measurement mechanism of heald frame mechanical impedance according to claim 2, is characterized in that: described mass (13) both sides be respectively stained with one described in damping layer (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320476929.2U CN203502186U (en) | 2013-08-06 | 2013-08-06 | Apparatus for measuring mechanical impedance of heald frame |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320476929.2U CN203502186U (en) | 2013-08-06 | 2013-08-06 | Apparatus for measuring mechanical impedance of heald frame |
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| CN203502186U true CN203502186U (en) | 2014-03-26 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103364160A (en) * | 2013-08-06 | 2013-10-23 | 江苏万工科技集团有限公司 | Device and method for measuring mechanical impedance of harness frame |
| CN104198140A (en) * | 2014-09-11 | 2014-12-10 | 江南大学 | Method for calibrating equivalent dynamic stiffness of packaging coupling interface of rigid-coupling product |
| CN104215417A (en) * | 2014-09-24 | 2014-12-17 | 江南大学 | Novel method for on-line determination of frequency response function of fragile component |
| CN104215416A (en) * | 2014-09-24 | 2014-12-17 | 江南大学 | New method for measuring packaging coupling interface equivalent dynamic stiffness |
| CN104792486A (en) * | 2015-04-28 | 2015-07-22 | 中国船舶重工集团公司第七○二研究所 | Vibration-isolating element transverse mechanical impedance testing device |
-
2013
- 2013-08-06 CN CN201320476929.2U patent/CN203502186U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103364160A (en) * | 2013-08-06 | 2013-10-23 | 江苏万工科技集团有限公司 | Device and method for measuring mechanical impedance of harness frame |
| CN104198140A (en) * | 2014-09-11 | 2014-12-10 | 江南大学 | Method for calibrating equivalent dynamic stiffness of packaging coupling interface of rigid-coupling product |
| CN104215417A (en) * | 2014-09-24 | 2014-12-17 | 江南大学 | Novel method for on-line determination of frequency response function of fragile component |
| CN104215416A (en) * | 2014-09-24 | 2014-12-17 | 江南大学 | New method for measuring packaging coupling interface equivalent dynamic stiffness |
| CN104792486A (en) * | 2015-04-28 | 2015-07-22 | 中国船舶重工集团公司第七○二研究所 | Vibration-isolating element transverse mechanical impedance testing device |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140326 Termination date: 20140806 |
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| EXPY | Termination of patent right or utility model |