CN107135749A - A kind of quasi- zero stiffness multiple girder construction of control longitudinally axial flow threshing roller low-frequency vibration - Google Patents
A kind of quasi- zero stiffness multiple girder construction of control longitudinally axial flow threshing roller low-frequency vibration Download PDFInfo
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- CN107135749A CN107135749A CN201710283552.1A CN201710283552A CN107135749A CN 107135749 A CN107135749 A CN 107135749A CN 201710283552 A CN201710283552 A CN 201710283552A CN 107135749 A CN107135749 A CN 107135749A
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01F—PROCESSING OF HARVESTED PRODUCE; HAY OR STRAW PRESSES; DEVICES FOR STORING AGRICULTURAL OR HORTICULTURAL PRODUCE
- A01F12/00—Parts or details of threshing apparatus
- A01F12/18—Threshing devices
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01D—HARVESTING; MOWING
- A01D41/00—Combines, i.e. harvesters or mowers combined with threshing devices
- A01D41/12—Details of combines
- A01D41/127—Control or measuring arrangements specially adapted for combines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
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- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Mechanical Engineering (AREA)
- Vibration Prevention Devices (AREA)
Abstract
The invention provides a kind of multiple girder construction of quasi- zero stiffness of control longitudinally axial flow threshing roller low-frequency vibration, including left column, right column, quasi- zero stiffness Fu Liang, the multiple right connector of beam and the left connector of multiple beam, it is connected on the right side of the multiple beam of quasi- zero stiffness with the multiple right connector of beam, multiple beam left side is connected with the multiple left connector of beam, the multiple right connector of beam is connected with right column, the multiple left connector of beam is connected with left column, is connected in the multiple load bearing beam position of quasi- zero stiffness by cylinder shaft bearing with cylinder shaft；When the global stiffness that positive rigidity and negative stiffness Qu Liang shaft ends prestressing force when positive rigidity crossbeam is in equilbrium position by longitudinally axial flow threshing roller Under Dynamic Load produce negative stiffness is approximately zero, the multiple beam equalization point of quasi- zero stiffness is formed；Negative stiffness girder construction is aligned by connecting screw rod to be fixed, connection gasket is filled in positive rigidity crossbeam and negative stiffness Qu Liang equilbrium positions space in the multiple Liang Pinghengzhuantaichu of quasi- zero stiffness；The present invention can effectively control the low-frequency vibration produced in longitudinal axial flow roller threshing course.
Description
Technical field
It is vertical more particularly, to one kind control the invention belongs to threshing and separating device of combine harvester framework for support construction applications
The multiple girder construction of the quasi- zero stiffness of axial threshing cylinder low-frequency vibration.
Background technology
United reaper longitudinally axial flow threshing roller is wound by Culm of Rice in threshing course and constrained, longitudinal axial flow roller threshing
During the obvious vibration that produces of roller start with threshing and produce, fluctuated with feed quantity and change, terminate with threshing and disappear,
Vibration characteristics transition, it is difficult to vibration damping.The vibration produced in longitudinal axial flow roller threshing course often cause centrifugal blower on framework for support,
The mesomerisms such as vibratory sieve, backhaul plate, shuttle board, cut flow roller or frame, have a strong impact on sheller unit structural reliability and de-
Graininess energy.2014《EI》30 (8) phase articles《Crawler type feed full rice combine vibration-testing with
Analysis》Point out the maximum excited frequency difference 12.70Hz and 23.44Hz of combined harvester threshing cylinder zero load and field harvest；
2014《Applied Mechanics and Materials》69 (3) phase articles《Dynamic balancing of the
threshing drum in combine harvesters-The process,sources of imbalance and
negative impact of mechanical vibrations》Point out that the vibration of combined harvester threshing cylinder dominant frequency is less than
30Hz.External large-scale united reaper is from the 10t~15t that weighs, and normal open overregulates the method control threshing of roller rotary inertia
Vibration in journey, but this method by increase drum threshing during power consumption or main screw lift；Pass through hydraulic-driven damping control
The method vibrated during drum threshing, is difficult to match with existing track combine structure at present.
Because structural natural frequencies are directly proportional to rigidity, then rigidity is approximately zero quasi- its intrinsic frequency of zero stiffness structure
It is approximately zero, quasi- zero stiffness structure is commonly used for the vibration isolation control of middle low frequency.Patent CN201510418855.0 has invented one kind
Quasi- zero stiffness vibrating isolation system and its Nonlinear Feedback Control Method, can solve the suppression in passive vibration isolation system and feedback control system
Formant processed, reduces the amplitude that vibrating isolation system primary resonance peak goes out；Patent CN201610182527.X has invented a kind of quasi- zero stiffness
Depression bar, is mountable to all kinds of vibration-isolating platforms, it is had high quiet low dynamic stiffness characteristic in each free degree, thus realize low frequency every
Shake；Patent CN201610599158.4 has invented the three-dimensional isolation of the quasi- zero stiffness characteristic of a kind of band/shake bearing, the dish-shaped bullet of invention
Spring is in quasi- zero stiffness state just at state of applanation, vertical earthquake isolating/vibrating system, can play isolation vertical motion or earthquake mesh
's；But existing quasi- zero stiffness vibration-proof structure can not be matched with combined harvester threshing cylinder structure and framework for support.Due to joint
In harvester harvest, paddy rice feeding has time variation, with the separation of seed and curling up for flexible rice straw during drum threshing
Constrain, eccentric load present in drum threshing process and unbalance vibration can not be avoided, but be difficult to using counterweight, reversely shake
The methods such as dynamic, hydraulic pressure controllable damping are controlled to the vibration during drum threshing.Accordingly, it would be desirable to be directed to China's rice harves
The multiple girder construction of the quasi- zero stiffness vibration damping of vibration control of phase characteristic design track combine longitudinal axial flow roller threshing course.
The content of the invention
The obvious oscillation phenomenon produced for roller in existing track combine longitudinal axial flow roller threshing course, with
Threshing starts and produced, fluctuated with feed quantity and changes, terminates with threshing and disappear, and vibration characteristics transition and is difficult to vibration damping, this
Invention provide on the right side of a kind of multiple girder construction of quasi- zero stiffness for controlling longitudinally axial flow threshing roller low-frequency vibration, the multiple beam of quasi- zero stiffness with
The right connector of multiple beam is connected, left side is connected with the multiple left connector of beam, and the multiple right connector of beam is connected with right column, the left connector of multiple beam
It is connected with left column, is connected in the middle part of the multiple beam of quasi- zero stiffness by cylinder shaft bearing with cylinder shaft；Positive rigidity crossbeam by
Positive rigidity is produced with negative stiffness Qu Liang shaft ends by prestressing force screw extruding when longitudinally axial flow threshing roller Under Dynamic Load is in equilbrium position
Quasi- zero stiffness multiple beam equalization point is formed when the global stiffness of negative stiffness is approximately zero during raw prestressing force；Weighed by the multiple Liangping of quasi- zero stiffness
Point carries out vibration isolation control to the low-frequency vibration produced during longitudinally axial flow threshing drum threshing.
The present invention is to realize above-mentioned technical purpose by following technological means.
The multiple girder construction of quasi- zero stiffness of a kind of control longitudinally axial flow threshing roller low-frequency vibration, it is characterised in that including fixation
Left column and right column, quasi- zero stiffness Fu Liang, the multiple right connector of beam and the left connector of multiple beam on chassis main frame；Described accurate zero
The multiple beam of rigidity includes positive rigidity crossbeam, negative stiffness and bends beam and positive and negative rigidity beam connection gasket, and the positive rigidity crossbeam is located at negative stiffness
On the upside of Qu Liang and both middle parts are fixedly connected, and positive and negative rigidity beam connection gasket is located at positive rigidity crossbeam and negative stiffness is bent in the middle part of beam
Between gap；The quasi- zero stiffness Fu Liang left and right ends are connected to by the right connector of multiple beam, the multiple left connector of beam respectively
On left column and right column, prestressing force screw rod is set at the right connector of the multiple beam, bending beam to negative stiffness applies prestressing force；It is described
The cylinder shaft two ends of threshing cylinder are by bearing block in the middle part of the multiple beam of quasi- zero stiffness.
Further, the positive rigidity crossbeam by longitudinally axial flow threshing roller Under Dynamic Load be in equilbrium position when positive rigidityWherein E1For the modulus of elasticity of positive rigidity crossbeam, I1For the moment of inertia of positive rigidity crossbeam, π is constant 3.14, and L is
The length of positive rigidity crossbeam；Negative stiffness Qu Liang shaft ends are produced negative stiffness during prestressing force by prestressing force screw extrudingWherein E2The modulus of elasticity of beam, I are bent for negative stiffness2Beam the moment of inertia is bent for negative stiffness, π is constant 3.14, l
The length of beam is bent for negative stiffness, k is the rigidity that negative stiffness bends beam free state；Positive rigidity crossbeam and negative stiffness bend beam in equalization point
The rigidity k at place++K-≈ 0 produces the multiple beam equalization point of quasi- zero stiffness, in the multiple Liang Pinghengzhuantaichu of quasi- zero stiffness by positive and negative rigidity beam
Connecting screw rod is fixed, and the positive and negative rigidity beam connecting screw rod is U-shaped screw rod.
Further, the negative stiffness bends beam right-hand member and is connected with negative stiffness stress beam transverse slat in the wrong, the right side of the stress transverse slat
Screw rod positioning sleeve is provided with end face, the prestressing force screw rod is extended in screw rod positioning sleeve, by its positioning, and the negative stiffness is bent
The right engaging lug of beam is bent in stress beam transverse slat left side provided with negative stiffness, and negative stiffness bends beam right-hand member and bends Liang Youlian by bolt and negative stiffness
Lug is connected.
Further, the right connector of the multiple beam includes the right connection U-shaped set of multiple beam, prestressing force nut, the right connection U-shaped of multiple beam
Set is bolted on right column by 2；The right connection U-shaped set top of multiple beam is provided with the circle for assembling positive rigidity crossbeam
Shape through hole, prestressing force nut is fixed on the right connection U-shaped set right side of the multiple beam, and prestressing force screw rod is through right column and in advance should
Power nut is bent stress beam transverse slat with negative stiffness and is connected；The left connector of the multiple beam includes the left connection U sets of multiple beam and left connection U-shaped set
Ear, the multiple left connection U sets of beam are bolted on left column by 2；The multiple left connector top of beam, which is provided with, to be used to assemble positive rigidity horizontal stroke
The manhole of beam；It is annular shape that negative stiffness, which bends beam left end, is bolted on left connection U-shaped set ear；Positive rigidity crossbeam
Two ends are attached separately in the manhole of the right connection U-shaped set of the left connector of multiple beam, multiple beam.
Further, the negative stiffness bends upside in the middle part of beam, downside is respectively fixed with a positioning in the middle part of positive rigidity crossbeam
Lasso 504；The negative stiffness is bent in the middle part of beam with being connected in the middle part of positive rigidity crossbeam by positioning lasso.
Further, it is width 40mm~60mm, thick 2mm~4mm, length that accurate positive the rigidity crossbeam and negative stiffness, which bend beam,
500mm~600mm leaf spring；It is 12mm~16mm circle hooks that negative stiffness, which is bent and internal diameter is bowed out on the left of beam, and negative stiffness bends beam right side edge
Within two through holes that internal orifice dimension is 12mm~16mm are provided with 25mm.
Beneficial effects of the present invention：
(1) present invention is directed to the low frequency vibration isolation for being wound constraint generation by Culm of Rice during longitudinally axial flow threshing and devises one
The multiple girder construction of quasi- zero stiffness of control longitudinally axial flow threshing roller low-frequency vibration is planted, beam, positioning sleeve are bent by positive rigidity crossbeam, negative stiffness
Circle, positive and negative rigidity beam connecting screw rod, positive and negative rigidity beam connection gasket are constituted, and are made in positive rigidity crossbeam by longitudinally axial flow threshing roller dynamic load
When the global stiffness that positive rigidity and negative stiffness Qu Liang shaft ends prestressing force produce negative stiffness during with equilbrium position is approximately zero, i.e. shape
Into the multiple beam equalization point of quasi- zero stiffness；There is high quiet low dynamic stiffness characteristic in the multiple beam balance point position of quasi- zero stiffness；It is firm by standard zero
The multiple beam equalization point of degree carries out vibration isolation control to the low-frequency vibration produced during longitudinally axial flow threshing drum threshing, solves roller and takes off
With shaking that the separation of seed and the eccentric load and unbalance vibration that curl up constraint presence of flexible rice straw are produced during grain
Dynamic transmission.
(2) prestressing force screw rod of the invention is through prestressing force nut and is contacted with negative stiffness stress beam transverse slat in the wrong, prestressing force
Screw rod left end is spacing by screw rod positioning sleeve, and carrying out pretension by prestressing force screw rod and prestressing force nut bends stress beam horizontal stroke to negative stiffness
Plate applies prestressing force, and the shaft end prestress application that negative stiffness bends beam is simple in construction, can conveniently be controlled by adjusting prestressing force screw rod
Negative stiffness processed bends the negative stiffness size of beam, and negative stiffness bends girder construction regulation and simple to operate；Can also be according to the productions of field crops
Amount and growth characteristics precisely adjust negative stiffness Qu Liang shaft ends prestressing force and build the multiple beam knot of quasi- zero stiffness for being applicable Different Crop harvest
Structure.
(3) when the positive rigidity crossbeam and negative stiffness of the present invention positive and negative global stiffness of the beam at equalization point in the wrong are zero, that is, produce
The multiple beam equilibrium point control longitudinal axial flow roller threshing course vibration of quasi- zero stiffness, the multiple girder construction of quasi- zero stiffness and appearance and size with it is existing
Track combine is matched, and can directly replace longitudinally axial flow threshing roller carrying on existing track combine horizontal
The present invention, can also be directly applied on the crawler type rice combine of existing structure size, reduce and research and develop into by beam
This, greatly improves the versatility and universality of the present invention.
(4) be connected on the right side of the multiple beam of quasi- zero stiffness of the invention with the multiple right connector of beam, on the left of the multiple beam of quasi- zero stiffness and multiple beam
Left connector is connected, and the multiple right connection U-shaped set of beam is enclosed on right column, the multiple left connection U of beam is enclosed on left column, then by standard
It is connected in the middle part of the multiple beam of zero stiffness by cylinder shaft bearing with the cylinder shaft of threshing cylinder, the present invention is used and applied in shaft end
The method of Prestressing builds controllable negative stiffness and bends beam, and prestressing force bends beam and do not change roller frame original structure and running parameter,
Bearing beam strength and stability under dynamic load exciting is ensure that, is solved using existing quasi- zero stiffness structural bearing longitudinal axial flow roller
The strength and stability problem that dynamic loading is carried during drum threshing is difficult to ensure that during dynamic load.
Brief description of the drawings
The multiple girder construction of the quasi- zero stiffness of Fig. 1 and the installation diagram of longitudinally axial flow threshing roller.
The multiple girder construction of the quasi- zero stiffness of Fig. 2 and longitudinally axial flow threshing roller assembling structure schematic diagram.
The top view that the multiple beam of the quasi- zero stiffness of Fig. 3 is assembled by connector and column.
Fig. 4 negative stiffnesses bend stress members assembling schematic diagram on the right side of beam.
Fig. 5 negative stiffnesses bend stress beam plate primary structure member assembling schematic diagram.
The left connector top view of the multiple beams of Fig. 6.
The left connector right view of the multiple beams of Fig. 7.
The right connector top view of the multiple beams of Fig. 8.
The right connector left view of the multiple beams of Fig. 9.
The right connector right view of the multiple beams of Figure 10.
The positive rigidity crossbeam front views of Figure 11.
Figure 12 negative stiffnesses bend beam front view.
Figure 13 negative stiffnesses bend beam top view.
The positive and negative rigidity beam connecting screw rod front views of Figure 14.
Figure 15 positions lasso top view.
Figure 16 negative stiffnesses bend the right engaging lug front view of beam.
Figure 17 negative stiffnesses bend stress beam transverse slat front view.
Figure 18 screw rod positioning sleeve front views.
The left connection U-shaped set ear front views of Figure 19.
Figure 20 prestressing force screw rod front views.
Figure 21 left column front views.
Figure 22 right column front views.
The positive rigidity crossbeams of Figure 23 bend beam free state structural representation with negative stiffness.
The multiple beam control longitudinal axial flow roller low-frequency vibration schematic diagram of the quasi- zero stiffness of Figure 24.
Description of reference numerals is as follows：
1- chassis main frames, 2- left columns, 3- right columns, 4- concave grates, the multiple beam of the quasi- zero stiffness of 5-, the positive rigidity crossbeams of 501-,
On the left of the positive rigidity crossbeams of 501A-, on the right side of the positive rigidity crossbeams of 501B-, 502- negative stiffnesses are bent on the left of beam, 502A- negative stiffnesses curved beam,
On the right side of 502B- negative stiffnesses curved beam, the positive and negative rigidity beam connection gaskets of 503-, the positive rigidity crossbeam lassos of 504A-, 504B- negative stiffnesses bend beam
Lasso, the positive and negative rigidity beam connecting screw rods of 505-, 506- screw rod positioning sleeves, 507- negative stiffnesses bend beam and connect right screw rod, and 508- is negative firm
The right engaging lug of degree beam in the wrong, 509- negative stiffnesses stress beam transverse slat in the wrong, 5010- exciting forces, 6- threshing cylinders, 601- threshing roll cylinders,
602- cylinder shaft bearings, 603- cylinder shafts, 7- roller top covers, the right connector of the multiple beams of 8-, the right connection U-shaped of the multiple beams of 801-
Set, 802- prestressing force nuts, 803- prestressing force screw rods, the left connector of the multiple beams of 9-, the left connection U sets of the multiple beams of 901-, the left connection U of 902-
Shape covers ear, the left connection U-shaped set ear B of the left connection U-shaped set ear A, 902B- of 902A-.
Embodiment
Below in conjunction with the accompanying drawings and specific embodiment the present invention is further illustrated, but protection scope of the present invention is simultaneously
Not limited to this.
It is as illustrated in figs. 1 and 2, the multiple beam knot of quasi- zero stiffness of control longitudinally axial flow threshing roller low-frequency vibration of the present invention
Structure, including the multiple beam 5 of left column 2, right column 3, quasi- zero stiffness, the multiple right connector 8 of beam and the left connector 9 of multiple beam.Left column 2, the right side
Column 3 is fixed on chassis main frame.The multiple right side of beam 5 of the quasi- zero stiffness is connected on right column 3 by the right connector 8 of multiple beam,
The multiple beam 5 of quasi- zero stiffness passes on left the left connector 9 of multiple beam and is connected on left column 2.The threshing cylinder 6 includes threshing roll cylinder
601st, cylinder shaft bearing 602, cylinder shaft 603, the upside of threshing roll cylinder 601 are that roller top cover 7, downside are concave grate
4；The cylinder shaft 603 of threshing cylinder 6 is fixed on the multiple middle part of beam 5 of the quasi- zero stiffness by cylinder shaft bearing 602.
The multiple beam 5 of the quasi- zero stiffness includes positive rigidity crossbeam 501, negative stiffness and bends beam 502 and positive and negative rigidity beam connection gasket
503, the positive rigidity crossbeam 501 is located at negative stiffness and bends the upside of beam 502, and positive and negative rigidity beam connection gasket 503 is located at positive rigidity crossbeam
Between 501 and negative stiffness beam 502 in the wrong.The middle part that the positive rigidity crossbeam 501 bends beam 502 with negative stiffness is fixedly connected.
As shown in Fig. 3, Fig. 4 and Fig. 5, the negative stiffness bends middle side part on beam 502 and is provided with negative stiffness beam casing circle 504B in the wrong,
Negative stiffness is bent the right-hand member of beam 502 and is connected with negative stiffness stress beam transverse slat 509 in the wrong；The negative stiffness bends the left surface of stress beam transverse slat 509
Symmetrical above and below to be provided with the right engaging lug 508 of two negative stiffnesses beam in the wrong, negative stiffness is bent the right center position of stress beam transverse slat 509 and installed
There is screw rod positioning sleeve 506；Negative stiffness bends the right side of beam 502 and is connected the right side by negative stiffness beam in the wrong with the negative stiffness right engaging lug 508 of beam in the wrong
Screw rod 507 is fixed.
As shown in Figure 6 and Figure 7, the left connector 9 of the multiple beam includes the left connection U sets 901 of multiple beam and left connection U-shaped set ear
902, the multiple left connection U of beam is covered between 2 through holes that a diameter of 12mm~16mm is provided with 901 left and right sides, holes center
Away from for 100mm~120mm.The left connection U sets 901 of multiple beam are enclosed on left column 2, and the multiple left connection U sets 901 of beam are by 2 diameters
It is fixed for 10mm~14mm bolt and left column 2.The multiple left top of connector 9 of beam, which is provided with, to be used to assemble positive rigidity crossbeam
501 manhole；The left end of positive rigidity crossbeam 501 is penetrated in the manhole on the left top of connector 9 of multiple beam.Left connection U-shaped
Cover ear 902 and be located at the left lower right side of connector 9 of the multiple beam, respectively left connection U-shaped set ear A 902A and left connection U-shaped set ear
B 902B, in the middle of 2 through hole and are symmetrically installed.Left connection U-shaped set ear A902A and left connection U-shaped set ear B902B spacing
For 6mm~8mm.It is annular shape that negative stiffness, which bends the left end of beam 502, and positioned at left connection U-shaped set ear A 902A and left connection U-shaped set ear
In the middle of B 902B, it is bolted on left connection U-shaped set ear 902.
As shown in Fig. 8, Fig. 9, Figure 10, the right connector 8 of the multiple beam includes the right connection U-shaped set 801 of multiple beam, prestressing force nut
802nd, prestressing force screw rod 803；2 that a diameter of 12mm~16mm is provided with 801 left surfaces of the right connection U-shaped set of multiple beam are led to
Hole, adjacent holes center spacing is 40mm~60mm, and 2 through hole centre positions are provided with 6mm × 6mm square through hole；Multiple beam is right
Connection U-shaped, which covers, is provided with a diameter of 12mm~16mm 3 through holes on 801 right flanks, adjacent holes center spacing be 40mm~
60mm；The multiple right connection U-shaped of beam covers 801 right side intermediate throughholes and is embedded with the prestressing force nut 802 that external diameter is 12mm~16mm.Multiple beam
Right connection U-shaped covers 801 and is enclosed on right column 3, bolt and the right side of the multiple right connection U-shaped set 801 of beam by 2 a diameter of 10mm~14mm
Column 3 is fixed；The circle that right 801 tops of connection U-shaped set of multiple beam are provided with for assembling positive rigidity crossbeam 501 is led to
Hole, the positive right-hand member of rigidity crossbeam 501 penetrates the right connection U-shaped of multiple beam and covered in the manhole of 801 upper left quarters.Negative stiffness bends beam
502 right sides cover 801 left side square holes through the right connection U-shaped of multiple beam, and prestressing force screw rod 803 passes through prestressing force nut 802, right column 3
Stress beam transverse slat 509 is bent with negative stiffness to contact, the left end of prestressing force screw rod 803 is spacing by screw rod positioning sleeve 506, by prestressing force spiral shell
Bar 803 carries out pretension with prestressing force nut 802 and the application prestressing force of stress beam transverse slat 509 is bent to negative stiffness.
As shown in Figure 11, Figure 12, Figure 13, accurate positive the rigidity crossbeam 501 and negative stiffness bend beam 502 be width 40mm~
60mm, thick 2mm~4mm, long 500mm~600mm leaf spring；It is 12mm~16mm circles that negative stiffness, which bends the left side of beam 502 and bows out internal diameter,
Hook, negative stiffness, which is bent, is provided with two through holes that internal orifice dimension is 12mm~16mm at 25mm within the right side edge of beam 502.
Described positive 501 times middle side parts of rigidity crossbeam are provided with positive rigidity crossbeam lasso 504A, and negative stiffness bends beam casing circle 504B
It is connected with positive rigidity crossbeam lasso 504A by positive and negative rigidity beam connecting screw rod 505, realizes that negative stiffness bends beam 502 horizontal with positive rigidity
Being fixedly connected in the middle part of beam 501.The positive and negative rigidity beam connecting screw rod 505 is a diameter of 10mm~12mm U-shaped screw rod, is such as schemed
Shown in 14, two ends pitch spacing is 50mm~60mm.The positive rigidity crossbeam lasso 504A and negative stiffness bend beam casing circle
504B internal orifice dimension is that 12mm~16mm, thickness are the hollow cylinder that 2mm, length are 10mm~12mm, as shown in figure 15.
The negative stiffness right profile of engaging lug 508 of beam in the wrong is 40mm × 60mm, the steel plate that thickness is 4mm~6mm, intermediate symmetry
12mm~16mm 2 through holes are provided with, as shown in figure 16.The negative stiffness bend the profile of stress beam transverse slat 509 be 40mm × 60mm,
Thickness is 4mm~6mm steel plate, as shown in figure 17；The internal diameter of screw rod positioning sleeve 506 is 12mm~16mm, be highly 8mm~
10mm, thickness are 4mm~6mm steel ring, as shown in figure 18.
It is left connection U-shaped set ear A902A and left connection U-shaped set ear B 902B thickness be 4mm~6mm, width degree of being 40mm~
60mm, rectangle and semicircle combined steel plate highly for 50mm~60mm, ear A902A and left connection U-shaped set ear B 902B are covered in U-shaped
One section is provided with the through hole that internal orifice dimension is 12mm~16mm, as shown in figure 19.The a diameter of 10mm of the prestressing force screw rod 803~
14mm, length are 50mm~60mm bolt, as shown in figure 20.
As shown in figure 21 and figure, the left column 2 and right column 3 be wall thickness 2mm~3mm, cross sectional shape be 40mm ×
40mm square steel；A diameter of 12mm~16mm 2 through holes are provided with the left and right sides of left column 2, holes center spacing is
100mm~120mm；A diameter of 12mm~16mm 3 through holes are provided with the left and right sides of right column 3, holes center spacing is
40mm~60mm；12mm~16mm through hole is embedded with the prestressing force nut that external diameter is 12mm~16mm in the middle of on left column 2
802。
As shown in figure 23, the positive rigidity crossbeam 501 by the Under Dynamic Load of longitudinally axial flow threshing roller 6 be in equilbrium position when
Positive rigidityWherein E1For the modulus of elasticity of positive rigidity crossbeam 501, I1For the moment of inertia of positive rigidity crossbeam 501, π is
Constant 3.14, L is the length of positive rigidity crossbeam 501；, negative stiffness, which is bent the shaft end of beam 502 and produced by the extruding of prestressing force screw rod 803, in advance should
Negative stiffness during powerWherein E2The modulus of elasticity of beam 502, I are bent for negative stiffness2Beam 502 is bent for negative stiffness to be used to
Property square, π is constant 3.14, and l is the length that negative stiffness bends beam 502, and k is the rigidity that negative stiffness bends beam 502 free state；Positive rigidity
Crossbeam 501 and negative stiffness bend rigidity k of the beam 502 at equalization point++K-≈ 0 produces the multiple equalization point of beam 5 of quasi- zero stiffness, in standard zero
Fixed at the multiple poised state of beam 5 of rigidity by positive and negative rigidity beam connecting screw rod 505, beam 502 is bent in positive rigidity crossbeam 501 and negative stiffness
Positive and negative rigidity beam connection gasket 503 is placed in the middle of poised state.
As shown in figure 24, the positive rigidity crossbeam 501 includes 501A and positive rigidity crossbeam right side on the left of positive rigidity crossbeam
501B, negative stiffness, which bends beam 502, includes 502A and negative stiffness curved beam right side 502B on the left of negative stiffness curved beam；Positive rigidity crossbeam 501 with
Negative stiffness bends beam 502 and quasi- zero stiffness constitutional balance point is formed at positive and negative rigidity beam connection gasket 503；It is flat in the multiple beam 5 of quasi- zero stiffness
When at weighing apparatus point by exciting force 5010, if the multiple beam equalization point of quasi- zero stiffness is moved upwards, 501A and just on the left of positive rigidity crossbeam
501B, which is pressurized, on the right side of rigidity crossbeam absorbs 502A and negative stiffness curved beam right side 502B tensions release energy on the left of energy, negative stiffness curved beam
Amount, the multiple equalization point of beam 5 of quasi- zero stiffness makes a concerted effort just to balance with exciting force 5010；If the multiple beam equalization point of quasi- zero stiffness is moved downward,
Then 501B tensions release energy on the right side of 501A and positive rigidity crossbeam on the left of positive rigidity crossbeam, 502A and negative firm on the left of negative stiffness curved beam
The beam right side 502B that writes music, which is pressurized, absorbs energy, and the multiple equalization point of beam 5 of quasi- zero stiffness makes a concerted effort just to balance with exciting force 5010.
For the present invention preferred embodiment, but the present invention is not limited to above-mentioned embodiment to the embodiment, not
In the case of the substantive content of the present invention, any conspicuously improved, replacement that those skilled in the art can make
Or modification belongs to protection scope of the present invention.
Claims (6)
1. the multiple girder construction of quasi- zero stiffness of a kind of control longitudinally axial flow threshing roller low-frequency vibration, it is characterised in that including being fixed on
The multiple beam (5) of left column (2) and right column (3), quasi- zero stiffness, the multiple right connector of beam (8) and the left connection of multiple beam on chassis main frame
Part (9)；The multiple beam (5) of the quasi- zero stiffness includes positive rigidity crossbeam (501), negative stiffness and bends beam (502) and the connection of positive and negative rigidity beam
Pad (503), the positive rigidity crossbeam (501) is located on the upside of negative stiffness beam (502) in the wrong and both middle parts are fixedly connected, positive and negative
Rigidity beam connection gasket (503) is located at the gap between positive rigidity crossbeam (501) and negative stiffness beam (502) middle part in the wrong；The standard
Multiple beam (5) left and right ends of zero stiffness respectively by the right connector of multiple beam (8), the multiple left connector of beam (9) be connected to left column (2) and
On right column (3), described multiple beam right connector (8) place sets prestressing force screw rod (803), and beam (502) is bent to negative stiffness and applies pre-
Stress；Cylinder shaft (603) two ends of the threshing cylinder (6) are by bearing block (602) in the multiple beam (5) of quasi- zero stiffness
Portion.
2. the multiple girder construction of quasi- zero stiffness of control longitudinally axial flow threshing roller low-frequency vibration according to claim 1, its feature
It is, the positive rigidity crossbeam (501) is in positive rigidity during equilbrium position by longitudinally axial flow threshing roller (6) Under Dynamic LoadWherein E1For the modulus of elasticity of positive rigidity crossbeam (501), I1For the moment of inertia of positive rigidity crossbeam (501), π is normal
Number 3.14, L is the length of positive rigidity crossbeam (501)；Negative stiffness bends beam (502) shaft end and is extruded generation by prestressing force screw rod (803)
Negative stiffness during prestressing forceWherein E2The modulus of elasticity of beam (502), I are bent for negative stiffness2Bent for negative stiffness
Beam (502) the moment of inertia, π is constant 3.14, and l is the length that negative stiffness bends beam (502), and k is that negative stiffness bends beam (502) free state
Rigidity；Positive rigidity crossbeam (501) and negative stiffness bend rigidity k of the beam (502) at equalization point++K-≈ 0 produces quasi- zero stiffness
Multiple beam (5) equalization point, it is fixed by positive and negative rigidity beam connecting screw rod (505) at multiple beam (5) poised state of quasi- zero stiffness, it is described just
Negative stiffness beam connecting screw rod (505) is U-shaped screw rod.
3. the multiple girder construction of quasi- zero stiffness of control longitudinally axial flow threshing roller low-frequency vibration according to claim 1, its feature
It is, the negative stiffness bends beam (502) right-hand member and is connected with negative stiffness stress beam transverse slat (509) in the wrong, the stress transverse slat (509)
Screw rod positioning sleeve (506) is provided with right side, the prestressing force screw rod (803) is extended in screw rod positioning sleeve (506), by it
Positioning, the negative stiffness bends stress beam transverse slat (509) left side and bends the right engaging lug of beam (508) provided with negative stiffness, and negative stiffness bends beam
(502) right-hand member is bent the right engaging lug of beam (508) by bolt and negative stiffness and is connected.
4. the multiple girder construction of quasi- zero stiffness of control longitudinally axial flow threshing roller low-frequency vibration according to claim 3, its feature
It is, the multiple right connector of beam (8) includes the right connection U-shaped set (801) of multiple beam, prestressing force nut (802), the right connection U of multiple beam
Shape set (801) is bolted on right column (3) by 2；Described right connection U-shaped set (801) top of multiple beam is provided with for filling
Manhole with positive rigidity crossbeam (501), prestressing force nut (802) is fixed on described right connection U-shaped set (801) right-hand member of multiple beam
On face, prestressing force screw rod (803) bends stress beam transverse slat (509) phase through right column (3) and prestressing force nut (802) with negative stiffness
Even；The multiple left connector of beam (9) includes the left connection U sets (901) of multiple beam and left connection U-shaped set ear (902), the left connection U of multiple beam
Set (901) is bolted on left column (2) by 2；Multiple beam left connector (9) top, which is provided with, to be used to assemble positive rigidity crossbeam
(501) manhole；It is annular shape that negative stiffness, which bends beam (502) left end, is bolted on left connection U-shaped set ear (902)
On；Positive rigidity crossbeam (501) two ends are attached separately to the left connector of multiple beam (9), the manhole of the right connection U-shaped set (801) of multiple beam
It is interior.
5. a kind of multiple girder construction of quasi- zero stiffness of control longitudinally axial flow threshing roller low-frequency vibration according to claim 1, its
It is characterised by, the negative stiffness bends upside in the middle part of beam (502), downside is respectively fixed with negative stiffness in the middle part of positive rigidity crossbeam (501)
Bend beam casing circle 504B, positive rigidity crossbeam lasso 504A；The negative stiffness is bent beam casing circle 504B, positive rigidity crossbeam lasso 504A and passed through
Positive and negative rigidity beam connecting screw rod (505) is connected.
6. the multiple beam knot of quasi- zero stiffness of the control longitudinally axial flow threshing roller low-frequency vibration according to any one of claim 1-5
Structure, it is characterised in that it is width 40mm~60mm, thick 2mm that accurate positive the rigidity crossbeam (501) and negative stiffness, which bend beam (502),
~4mm, long 500mm~600mm leaf spring；It is 12mm~16mm circle hooks, negative stiffness that negative stiffness, which is bent and internal diameter is bowed out on the left of beam (502),
Two through holes that internal orifice dimension is 12mm~16mm are provided with Qu Liang (502) right side edge at 25mm.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710283552.1A CN107135749B (en) | 2017-04-26 | 2017-04-26 | It is a kind of control the low-frequency vibration of longitudinally axial flow threshing roller quasi- zero stiffness answer girder construction |
| PCT/CN2017/094227 WO2018196188A1 (en) | 2017-04-26 | 2017-07-25 | Quasi-zero stiffness composite beam structure for controlling low-frequency vibration of longitudinal axial flow threshing drum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710283552.1A CN107135749B (en) | 2017-04-26 | 2017-04-26 | It is a kind of control the low-frequency vibration of longitudinally axial flow threshing roller quasi- zero stiffness answer girder construction |
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| CN107135749A true CN107135749A (en) | 2017-09-08 |
| CN107135749B CN107135749B (en) | 2019-06-28 |
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| CN201710283552.1A Active CN107135749B (en) | 2017-04-26 | 2017-04-26 | It is a kind of control the low-frequency vibration of longitudinally axial flow threshing roller quasi- zero stiffness answer girder construction |
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| WO (1) | WO2018196188A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108124602A (en) * | 2018-01-03 | 2018-06-08 | 湖南农业大学 | For the floating control axial-flow type methods of threshing of chia threshing |
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| Publication number | Publication date |
|---|---|
| CN107135749B (en) | 2019-06-28 |
| WO2018196188A1 (en) | 2018-11-01 |
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