CN102632036A - Inertia force balancing method and device of rotary classifying screen - Google Patents
Inertia force balancing method and device of rotary classifying screen Download PDFInfo
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- CN102632036A CN102632036A CN2012101104507A CN201210110450A CN102632036A CN 102632036 A CN102632036 A CN 102632036A CN 2012101104507 A CN2012101104507 A CN 2012101104507A CN 201210110450 A CN201210110450 A CN 201210110450A CN 102632036 A CN102632036 A CN 102632036A
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Abstract
The invention relates to an inertia force balancing method and device of a rotary classifying screen. A driving device of a sieving ship comprises a crankshaft and a counter weight, wherein the crankshaft rotates around a rotary shaft, a feeding end of the sieve ship is hinged at a free end of the crankshaft, the phase difference between the counter weight and the feeding end of the sieve ship is 18 degrees, and the counter weight is integrated with the crankshaft, a discharging end of the sieving ship is supported on a ship seat through a tail device, and a spring is arranged between the back end surface of the tail device and the ship seat, wherein the mass of the crankshaft is m1, the total length of the crankshaft is R, and the distance between a centroid S1 and an axial line of the rotary shaft is lAS1; and the mass of the crankshaft is m2, the total length of the crankshaft is L, and the distance between the centroid S2 and a hinging point of a connecting rod and a sliding block is lCS2; and the mass-radius product of the counter weight is mere=[(lAS1/R)m1+(lCS2/L)m2]R. When an included angle of moving directions of the crankshaft and a sliding block is 90 degrees or 270 degrees, the spring is in an initial state, the mass of the sliding block is m3, a rate of angular motion of the crankshaft is omega, and the coefficient of stiffness of the spring is K=omega<2>[(lBS2/L)m2+m3], wherein the lBS2 is the distance between a centroid S2 of the connecting rod and the hinging point of the connecting rod and the crankshaft. The inertial force balancing method and device of the rotary classifying screen, disclosed by the invention, can reach full balance of rotary classification inertia force.
Description
Technical field
Classifying screen is turned round the present invention relates to one kind, more particularly to a kind of inertia force balance method for turning round classifying screen further relates to a kind of inertial force balancing device for turning round classifying screen.
Background technology
Revolution classifying screen is widely used in the screening of raw material and finished product, graded operation in the industries such as grain, food, feed, particularly common screening and classification in feed factory granular material or granulated meal, can also be used for the first clear of feed factory raw material, and after separating twice intermediate products classification.
Turning round classifying screen includes support, ship seat, sieve ship, suspension apparatus, drive device and rear-mounted installation, ship seat is by four suspension apparatus hangings on support, the feed end for sieving ship is slightly higher, support is on the drive means, make to form a sieve heel angle between sieve ship and horizontal plane, rearwardly moved with sharp material.The drive device of sieve ship includes the crank and balancing weight rotated around the shaft, the feed end of the sieve ship is hinged on the free end of the crank, the balancing weight differs 180 ° with the phase of sieve ship feed end and is connected as a single entity to balance the centrifugal force of sieve ship with the crank, the discharge end of sieve ship is slightly lower to be supported on ship seat by rear-mounted installation, and spring is provided between the rear end face and ship seat in the middle part of the rear-mounted installation.According to Hooke's law, in elastic limit, the elastic force f of spring size is directly proportional to the elongation x of spring, i.e. f=Kx, K is referred to as the coefficient of stiffiness of spring.
Motor is housed on ship seat, power passes to rotating shaft by V belt, rotating shaft driving crank drives the feed end of sieve ship to make horizontal circular movement again, and sieve ship its movement locus from feed end to discharge end gradually becomes elliptic motion by horizontal circular movement, eventually becomes approximate linear reciprocating motion.
Material enters sieve ship from charging aperture, under sieve ship feed end circular motion effect, rapidly and evenly it is distributed on whole compass screen surface width, and produce automatic classification, the less material of granularity sieves rapidly below the bed of material, and the larger material of granularity is then along sieve ship inclined-plane to lower end i.e. to discharging end motion above.The motion that ship is sieved near discharge end is approximate linear reciprocating motion, screen effect is gradually weakened, so that the particle more than screen size is moved rapidly to Way out, until outside discharge machine, completing the whole screening of material.
Existing revolution classifying screen is unable to complete equipilibrium due to inertia force, the underframe and basis of classifying screen is impacted, it is disadvantageous in that：（1）The vibration of large-scale classifying screen is big, influences big to factory building；（2）The compression handle of classifying screen is perishable, tail support is easily broken；（3）Classification sieve ship, support, screen cover have weld cracking and phenomenon of rupture.
Any object has certain size and shape, according to particle kinematics principle, if the dimension and shape of object are not worked in the phenomenon studied or role can be ignored, just object approximately can be regarded as a no size and shape but have the preferable object of quality, referred to as particle.Rigid body is made up of countless particles, and the mass centre of Particle Group is referred to as barycenter.Rigid body around certain rotating shaft rotate in fixed axis when, barycenter product of distance between the axis of rotation, the quality of barycenter and barycenter and rotating shaft can be regarded as and be referred to as mass-radius product.
At present, revolution classifying screen balances the inertia force of sieve ship with configuration balancing weight, the mass-radius product of balancing weight and the mass-radius product for the balancing weight for making longitudinal inertia force of sieve ship all balance all balanced due to the lateral inertia forces for making sieve ship numerically has larger difference, in order that lateral inertia forces and longitudinal inertia force that ship is sieved during revolution classifying screen work are all balanced simultaneously, balancing weight is needed to provide the inertia force of change to balance them, old-fashioned revolution classifying screen carries major-minor two balancing weights, major-minor balancing weight is with identical speed, opposite direction is rotated, it provides the inertia force of change, the inertia force that sieve ship is produced in motion process can be made all to be balanced in each position of whole stroke, but, because it needs to use spiral bevel gear to be driven, it is complicated, it is processed and matching requirements are higher, easy oil leak in use, maintenance is also highly difficult, even if balance of shaking force effect is fine, also it is rarely employed at present, gradually by belt transmission, single counterweight block structure is replaced.
Revolution classifying screen is belt transmission, single counterweight block structure mostly at present, although such now widely used revolution classifying screen has the advantages that simple in construction, easy to maintenance, no oil leaking pollution, but it is due to that the mass-radius product of balancing weight is difficult to hold, the inertia force of sieve ship can not be balanced all, the inertia force of ship is sieved after balancing weight is balanced, also a certain proportion of residual inertia force, if balancing weight unreasonable allocation, residual inertia force is bigger.This vibration that occurs in use of revolution classifying screen at present is big, irregular oscillation, component breakage and problems of crack have impact on production, potential safety hazard is caused, it is the main cause for producing these problems that the inertia force of sieve ship, which can not be balanced all larger with residual inertia force,.A kind of single balancing weight block device simple in construction, without oil leaking pollution is only worked out, and the full balance of revolution classifying screen inertia force can be reached, can just be tackled the problem at its root.
The content of the invention
The primary and foremost purpose of the present invention is, overcomes problems of the prior art there is provided a kind of inertia force balance method for turning round classifying screen, the rotating inertia force that the rotating inertia force that can produce balancing weight is just produced with classifying screen balances each other.
To solve above technical problem, a kind of inertia force balance method for turning round classifying screen provided by the present invention, the drive device of sieve ship includes the crank and balancing weight rotated around the shaft, the feed end of the sieve ship is hinged on the free end of the crank, the balancing weight differs 180 ° with the phase of sieve ship feed end and is connected as a single entity with the crank, the discharge end of the sieve ship is supported on ship seat by rear-mounted installation, and spring is provided between the rear end face and ship seat in the middle part of the rear-mounted installation（1）The characteristics of approximate straight line motion is made in gyration, discharge end is made according to the sieve ship feed end of revolution classifying screen, revolution classifying screen is reduced to slider-crank mechanism；（2）The sieve ship is considered as connecting rod, the rear-mounted installation is considered as sliding block；The crank quality is, total length is R, and barycenter is
, barycenter
Distance away from the shaft axis is；The connecting rod quality is
, total length is L, and barycenter is
, barycenter
Distance away from connecting rod and sliding block pin joint is
；（3）The quality of the balancing weight is
, axial line distance of the barycenter away from the rotating shaft of the balancing weight be
, the mass-radius product for obtaining the balancing weight is
,
。
Relative to prior art, the present invention achieves following beneficial effect：It is gyrating mass by the mass transitions of slider-crank mechanism
And moving mass
, gyrating massWith the quality of crank
And the quality of connecting rod
Relation be
, when
When, i.e. the mass-radius product of balancing weight and the mass-radius product of gyrating mass is equal, the barycenter of balancing weight and the barycenter of gyrating mass are coaxial, same to direction of rotation, constant speed rotation, phase difference is 180 °, can balance rotating quality inertia force.
As the improvement of the present invention, when the angle of the crank and sliding block moving direction is 90 ° or 270 °, the spring is in original state, and the quality of the sliding block is
, the crank rotation angle speed is ω, the coefficient of stiffiness of the spring, wherein
For connecting rod barycenterDistance away from connecting rod Yu crank pin joint.When the angle of crank and sliding block moving direction is 90 ° or 270 °, the elongation of spring or decrement are zero, take the coefficient of stiffiness of spring
When, the inertia force of moving mass and spring force are equal in magnitude, in opposite direction and act on same straight line, and both make a concerted effort to be 0, are a pair of equilibrant force.
It is another object of the present invention to overcome problems of the prior art there is provided a kind of inertial force balancing device for turning round classifying screen, the rotating inertia force that the rotating inertia force that can produce balancing weight is just produced with classifying screen balances each other.
To solve above technical problem, a kind of inertial force balancing device for turning round classifying screen provided by the present invention, the drive device of sieve ship includes the crank and balancing weight rotated around the shaft, the feed end of the sieve ship is hinged on the free end of the crank, the balancing weight differs 180 ° with the phase of sieve ship feed end and is connected as a single entity with the crank, the discharge end of the sieve ship is supported on ship seat by rear-mounted installation, spring is provided between rear end face and ship seat in the middle part of the rear-mounted installation, the sieve ship is considered as connecting rod, the rear-mounted installation is considered as sliding block；The crank quality is
, total length is R, and barycenter is
, barycenter
Distance away from the shaft axis is；The connecting rod quality is, total length is L, and barycenter is
, barycenter
Distance away from connecting rod and sliding block pin joint is
；The quality of the balancing weight is
, axial line distance of the barycenter away from the rotating shaft of the balancing weight be
, the mass-radius product of the balancing weight is
,。
Relative to prior art, the present invention achieves following beneficial effect：It is gyrating mass by the mass transitions of slider-crank mechanism
And moving mass
, gyrating mass
With the quality of crank
And the quality of connecting rodRelation be
, when
When, i.e. the mass-radius product of balancing weight and the mass-radius product of gyrating mass is equal, the barycenter of balancing weight and the barycenter of gyrating mass are coaxial, same to direction of rotation, constant speed rotation, phase difference is 180 °, can balance rotating quality inertia force.
As the improvement of the present invention, when the angle of the crank and sliding block moving direction is 90 ° or 270 °, the spring is in original state, and the quality of the sliding block is, the crank rotation angle speed is ω, the coefficient of stiffiness of the spring, wherein
For connecting rod barycenter
Distance away from connecting rod Yu crank pin joint.
Brief description of the drawings
The present invention is further detailed explanation with reference to the accompanying drawings and detailed description, and accompanying drawing is only provided to be used with reference to explanation, is not used to the limitation present invention.
Fig. 1 is the front view of the inertial force balancing device of revolution classifying screen.
Fig. 2 is Fig. 1 stereogram.
Fig. 3 is structure diagram of the invention.
Fig. 4 is calculating figure of the invention.
In figure：1. support；2. suspension apparatus；3. ship seat；4. motor；5. sieve ship；5 ', connecting rod；6. rotating shaft；7. crank；8. balancing weight；9. rear-mounted installation；9 ', sliding block；10. spring；A is crank pivot and shaft axis；B is that crank and connecting rod are hinged center；C is the tie point of connecting rod and sliding block；Angle
For crank and x-axis angle；Angle
For connecting rod and x-axis angle.
Embodiment
As shown in Figures 1 and 2, turning round classifying screen includes support 1, suspension apparatus 2, ship seat 3, sieve ship 5, drive device and rear-mounted installation 9, ship seat 3 is hung on support 1 by four suspension apparatus 2, the feed end for sieving ship 5 is slightly higher, support is on the drive means, make to form a sieve heel angle between sieve ship and horizontal plane, rearwardly moved with sharp material.Sieving the drive device of ship includes the crank 7 and balancing weight 8 of 6 rotations around the shaft, the feed end of sieve ship 5 is hinged on the free end of crank 7, balancing weight 8 differs 180 ° with the phase of sieve ship feed end and is connected as a single entity to balance the centrifugal force of sieve ship with crank, the discharge end of sieve ship is slightly lower to be supported on ship seat by rear-mounted installation 9, and spring 10 is provided between the middle part rear end face of rear-mounted installation 9 and ship seat 3.
Motor 4 is housed on ship seat 3, power passes to rotating shaft 6 by V belt, the driving crank 7 of rotating shaft 6 drives the feed end of sieve ship 5 to make horizontal circular movement again, and sieve its movement locus from feed end to discharge end of ship 5 gradually becomes elliptic motion by horizontal circular movement, eventually becomes approximate linear reciprocating motion.
As shown in Figures 3 and 4, the characteristics of approximate straight line motion is made in gyration, discharge end is made according to the sieve ship feed end of revolution classifying screen, revolution classifying screen is reduced to slider-crank mechanism；Sieve ship 5 is considered as connecting rod 5 ', rear-mounted installation 9 is considered as sliding block 9 '.A is crank pivot and shaft axis；B is that crank and connecting rod are hinged center；C is the tie point of connecting rod and sliding block；Angle
For crank and x-axis angle；AngleFor connecting rod and x-axis angle.
The mass of crank 7 is, total length is R, and barycenter is
, barycenter
Distance away from shaft axis is
, crank rotation angle speed is ω.
The quality of balancing weight 8 is
, axial line distance of the barycenter away from rotating shaft of balancing weight be
。
The quality of connecting rod 5 ' is, total length is L, and barycenter is
, barycenter
Distance away from connecting rod and sliding block pin joint is
, connecting rod barycenter
Distance away from connecting rod and crank pin joint is
, connecting rod ratio
。
The quality of sliding block 9 ' is
, the stroke of sliding block is S, can be drawn by Fig. 3：
。
Because
, so
,, then：
。
Cause
Numerical value is smaller, will
Expansion, and take binomial before series, then：
The speed of sliding block is v：
The acceleration of sliding block：
It is gyrating mass by the mass transitions of slider-crank mechanism
And moving mass
：
...（5）
The inertia force F of gyrating massBFor：
The inertia force F of moving massCFor：
The present invention is that configuration mass-radius product is
Balancing weight carry out the inertia force of balance rotating quality, the barycenter of balancing weight and the barycenter of gyrating mass are coaxial, in the same direction, constant speed rotation, and phase difference is 180 °, while meeting following condition：
Can balance rotating quality inertia force, the mass-radius product needed for balancing weight can be accurately determined by the method for the present invention.
This method configures spring, the inertia force that the elastic force produced using spring is produced come balanced sequence quality in the slider end of mechanism.
The changing rule of the inertia force produced according to moving mass, the dynamic point origin that the initial position of spring is free state is scheduled on when crank is 90 ° or 270 ° with the angle of sliding block moving direction on corresponding slide position, one end connection sliding block, the other end is fixed on ship seat, makes the elastic force direction of spring and inertia force that moving mass is produced in opposite direction.The displacement of the dynamic point of spring
For：
...（9）
The coefficient of stiffiness of spring is K, then the elastic force of spring is：
If the inertia force of the Spring balanced moving mass of spring, both make a concerted effort is 0：
Due to
It is smaller, about 0.02, formula（7）、（10）Middle band
The maximum of item be respectively 0.02 and 0.01, therefore can be by formula（7）、（10）Middle bandItem remove and simplified style（7）、（10）, and and formula（11）Simultaneous solution, the coefficient of stiffiness K that can obtain spring is：
Conversely, when the coefficient of stiffiness K of spring takes（12）In numerical value, then the inertia force of moving mass and spring force to make a concerted effort be 0, i.e., by configuring the balance that spring has reached the inertia force of moving mass.
Therefore, this method is reduced to slider-crank mechanism using mass substitution method by classifying screen is turned round, and be gyrating mass and moving mass by the mass transitions of mechanism, using the balancing weight of rotation come balance rotating inertia force, spring is configured using the slider end in mechanism, the elastic force for producing spring is offseted with the inertia force that moving mass is produced, so as to reach the purpose of the balance of shaking force of revolution classifying screen.
Embodiment
Provided with single-revolution classifying screen, slider-crank mechanism is simplified to, crank length is 0.045m, qualityFor 2Kg, barycenter is
；Length of connecting rod is 2m, qualityFor 1200Kg, barycenter is
, the quality of sliding block
For 4Kg,
,
,, angular velocity of rotation ω is 20.93rad/s.Then：
The mass-radius product of balancing weight is：
The coefficient of elasticity of spring is：
Spring can be a helical spring, by the connection at two ends, realize stretching and compression or other equivalent ways.
It the foregoing is only the preferable possible embodiments of the present invention, non-therefore the limitation present invention scope of patent protection.In addition to the implementation, the present invention can also have other embodiment, and the initial position of such as spring is scheduled on when crank is 88 °~92 ° or 268 °~272 ° with the angle of sliding block moving direction on corresponding slide position.All use equivalent substitutions or the technical scheme of equivalent transformation formation, all fall within the protection domain of application claims.
Claims (4)
1. a kind of inertia force balance method for turning round classifying screen, the drive device of sieve ship includes the crank and balancing weight rotated around the shaft, the feed end of the sieve ship is hinged on the free end of the crank, the balancing weight differs 180 ° with the phase of sieve ship feed end and is connected as a single entity with the crank, the discharge end of the sieve ship is supported on ship seat by rear-mounted installation, spring is provided between rear end face and ship seat in the middle part of the rear-mounted installation, it is characterised in that：（1）The characteristics of approximate straight line motion is made in gyration, discharge end is made according to the sieve ship feed end of revolution classifying screen, revolution classifying screen is reduced to slider-crank mechanism；（2）The sieve ship is considered as connecting rod, the rear-mounted installation is considered as sliding block；The crank quality is
, total length is R, and barycenter is
, barycenterDistance away from the shaft axis is；The connecting rod quality is
, total length is L, and barycenter is
, barycenter
Distance away from connecting rod and sliding block pin joint is
；（3）The quality of the balancing weight is
, axial line distance of the barycenter away from the rotating shaft of the balancing weight be
, the mass-radius product of the balancing weight is
, obtain
。
2. the inertia force balance method of revolution classifying screen according to claim 1, it is characterised in that：When the angle of the crank and sliding block moving direction is 90 ° or 270 °, the spring is in original state, and the quality of the sliding block is, the crank rotation angle speed is ω, the coefficient of stiffiness of the spring
, wherein
For connecting rod barycenter
Distance away from connecting rod Yu crank pin joint.
3. a kind of inertial force balancing device for turning round classifying screen, the drive device of sieve ship includes the crank and balancing weight rotated around the shaft, the feed end of the sieve ship is hinged on the free end of the crank, the balancing weight differs 180 ° with the phase of sieve ship feed end and is connected as a single entity with the crank, the discharge end of the sieve ship is supported on ship seat by rear-mounted installation, spring is provided between rear end face and ship seat in the middle part of the rear-mounted installation, it is characterised in that：The sieve ship is considered as connecting rod, the rear-mounted installation is considered as sliding block；The crank quality is
, total length is R, and barycenter is
, barycenter
Distance away from the shaft axis is
；The connecting rod quality is
, total length is L, and barycenter is
, barycenterDistance away from connecting rod and sliding block pin joint is
；The quality of the balancing weight is
, axial line distance of the barycenter away from the rotating shaft of the balancing weight be, the mass-radius product of the balancing weight is
,。
4. the inertial force balancing device of revolution classifying screen according to claim 3, it is characterised in that：When the angle of the crank and sliding block moving direction is 90 ° or 270 °, the spring is in original state, and the quality of the sliding block is
, the crank rotation angle speed is ω, the coefficient of stiffiness of the spring
, whereinFor connecting rod barycenter
Distance away from connecting rod Yu crank pin joint.
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| CN2012101104507A CN102632036A (en) | 2012-04-16 | 2012-04-16 | Inertia force balancing method and device of rotary classifying screen |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101104507A CN102632036A (en) | 2012-04-16 | 2012-04-16 | Inertia force balancing method and device of rotary classifying screen |
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| CN102632036A true CN102632036A (en) | 2012-08-15 |
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ID=46616718
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107182452A (en) * | 2017-04-18 | 2017-09-22 | 江苏大学 | Combined harvester backhaul plate and vibratory sieve inertial force balancing device and balance method |
| CN107282434A (en) * | 2017-07-23 | 2017-10-24 | 江苏牧羊控股有限公司 | One kind revolution classifying screen feeder |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN107282434A (en) * | 2017-07-23 | 2017-10-24 | 江苏牧羊控股有限公司 | One kind revolution classifying screen feeder |
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Effective date of registration: 20130412 Address after: 225127 No. 1 shepherd Road, Hanjiang Industrial Zone, Hanjiang, Jiangsu, Yangzhou Applicant after: Jiangsu Muyang Group Corp., Ltd. Address before: 225127 No. 1 shepherd Road, Hanjiang Economic Development Zone, Jiangsu, Yangzhou Applicant before: Muyang Co., Ltd. |
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Application publication date: 20120815 |