CN103878118A - Novel elliptical equal-thickness vibrating screen - Google Patents
Novel elliptical equal-thickness vibrating screen Download PDFInfo
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Abstract
The invention discloses a novel elliptical equal-thickness vibrating screen. The vibrating screen is installed in a suspended mode and comprises a screen box, a double-shaft inertia vibration exciter, an elastic element, a transmission mechanism, a suspending device, a support and a punching screen plate. The aperture of the punching screen plate is 6 mm. The feeding end of the screen box is suspended on a supporting device through two springs, the discharge end of the screen box is connected to the supporting device through two rigid connecting rods with the two movable ends, the vibration exciter is a synchronous gear transmission double-shaft inertia vibration exciter and installed near the feeding end of the screen box, a feeding chute is formed in the upper portion of the feeding end of the screen box, a feeding baffle is made of sheet iron, and a discharge chute is formed in the tail of the discharge end of the screen box. According to the vibrating screen, a screen surface of the feeding section conducts elliptical motion, the discharge section conducts linear motion, the amplitude of vibration in the length direction of the screen surfaces and the amplitude of vibration perpendicular to the screen surfaces gradually reduce, the speed of movement of materials on the screen surfaces gradually reduces from the feeding end to the discharge end, the screen surfaces of the different sections are different in intensity of projection, layering and screening of materials are facilitated, and processing capacity and screening efficiency of the vibrating screen are obviously improved.
Description
Technical field:
The present invention relates to a kind of vibratory sieve of fine dry screening, particularly a kind of new elliptical vibration equal thick screen.
Background technology:
At present, at coal industry, along with the raising of mining mechanization degree, in raw coal, the content of particulate is more and more, in addition thermal coal fine coal content is higher, and hydraulic coal mining, the employing of the measures such as water spray is dustproof, raw coal moisture is high, in this case, while applying common bolting raw coal, fine is easily agglomerating at compass screen surface adhesive aggregation, and then obstruction sieve aperture, cause screening process severe exacerbation, sieve classification efficiency is low, therefore, the screening of fine, particularly the dry screening of moist fine particulate viscous material is the difficult point that Now Domestic is studied material sieving technology outward, it is urgent need to solve the problem in screening operation.
At present, elliptical vibration equal thick screen both domestic and external is mainly the inclination angle that changes each section of compass screen surface, and the thickness that is still feeding end on each section of compass screen surface is greater than the thickness of exhaust end, can only be called uniform thickness on the whole, it on part, is still non-uniform thickness, and same compass screen surface will be realized two or more impelling intensity, so that same screen(ing) machine may need two covers or overlap drive unit more, and this vibratory sieve often adopts the exciting device of two cover different frequency various amplitudes, feeding end adopts oval exciting, exhaust end adopts straight line exciting, so that not gradually change from material feeding end to exhaust end along the oscillation trajectory of screen length, in the time processing the moist material of 6mm granularity, screening efficiency is unsatisfactory, plug-hole is serious, can not fundamentally solve the problem in the sticky hole of moist fine particulate material plug-hole.
Summary of the invention:
The invention provides a kind of simple in structure, cost is low, installation and debugging novel oval-shaped equal-thickness vibrating screen easily, its objective is and has promoted the layering of fine, sieve thoroughly, improves disposal ability and the screening efficiency of vibratory sieve.
Technical scheme of the present invention is implemented, new elliptical vibration equal thick screen, employing hanging is installed, comprise screen box, biaxial inertial vibrator, flexible member, transmission mechanism, erecting by overhang and support, aperture is 6mm punching sieve plate, described screen box feeding end by two spring hangings on bracing or strutting arrangement, exhaust end is engaged on bracing or strutting arrangement by two rigidity connecting rods, the two ends of connecting rod are movable, described screen box screen angle is 10 °, described vibrator adopts synchromesh gear transmission biaxial inertial vibrator, be arranged near feeding end screen box, motor produces vibration by belt drives vibrator, due to the forced vibratory mechanism of gear couplings, make two exciting agencies keep a stable phase angle, rotate from making synchronous backward.Feed chute is installed in described screen box feeding end top; angle is 35 °～40 °; adopt sheet iron to make material feeding baffle; and vertical baffle side is near feeding end; described screen box exhaust end afterbody is installed discharge chute; and the horizontal spring of two little rigidity is installed, when preventing drive unit in startup or shutting down, because resonance produces strong waving, ensure the stability with transmission.
By enforcement of the present invention, this vibratory sieve gradually changes from material feeding end to exhaust end along the elliptical vibration track of screen length, utilizing the different impelling intensity that have along the different elliptical vibration tracks of screen length to realize screening with constant bed thickness, is 5t/ (hm in treating capacity
2) time, for-13mm grade, ash content is 43.25%, the coal sample screening that free moisture is 2.10%, efficiency can reach 96.8%.
Brief description of the drawings:
Fig. 1 new elliptical vibration equal thick screen mechanical model;
Fig. 2 new elliptical vibration equal thick screen pan feeding section and discharge zone compass screen surface movement locus;
The center of mass motion track of the different vibration frequencies of Fig. 3 new elliptical vibration equal thick screen;
Fig. 4 new elliptical vibration equal thick screen is with the center of mass motion track of eccentric mass;
The center of mass motion track of the different initial phase declinates of Fig. 5 new elliptical vibration equal thick screen;
The movement locus of compass screen surface under the different spring rates of Fig. 6 new elliptical vibration equal thick screen;
Fig. 7 throws beginning angle
with cast angle θ aside
drelation curve;
Fig. 8 throwing index D with cast coefficient i aside
drelation curve;
The novel oval-shaped equal-thickness sieve of Fig. 9 amount is along the distribution map of screen length.
Detailed description of the invention:
Detailed description of the invention 1 new elliptical vibration equal thick screen compass screen surface movement locus emulation
Each kinetic factor system spring rate K of new elliptical vibration equal thick screen, the quality m of eccentric block
1, m
2, mass M, eccentric block radius of gyration r and the excited frequency ω of casing determined the size of amplitude amplitude, as shown in Figure 1, the angular frequency of getting novel oval-shaped equal-thickness sieve according to design is 94.2rad/s to its mechanical model, gets frequency ratio λ=6, establishes m
1initial phase be 90 °, m
2lag behind Δ α, get initial phase declinate Δ α=60 ° here, adopt Matlab software can simulate the movement locus of compass screen surface under new elliptical vibration equal thick screen barycenter place and different spring rate.
Due to the difference of new elliptical vibration equal thick screen feeding end and exhaust end vertical direction upper spring stiffness K, the hanger spring rigidity of feeding end is K
1, and exhaust end hypothesis pull bar rigidity is K
2=∞, now gets feeding end and exhaust end spring rate K respectively
1and K
2, and according to above-mentioned simulation analysis, select suitable running parameter, can simulate near the movement locus of the compass screen surface of feeding end and exhaust end.
2 emulation can be found out with reference to the accompanying drawings, and near movement locus compass screen surface pan feeding section is elliptic motion; Discharge zone compass screen surface movement locus is straight line, and its direction of vibration is consistent with the elliptical trajectory short-axis direction of pan feeding section compass screen surface, and amplitude is the minor axis length of pan feeding section elliptical orbit.Therefore, can be greater than discharge zone amplitude by pan feeding section amplitude, and the vibrating direction angle of pan feeding section and discharge zone is different.
In the situation that other running parameter is constant, change operating frequency, can obtain the center of mass motion track under different vibration frequencies, see accompanying drawing 3.
Can be found out by accompanying drawing 3 emulation, when vibration frequency changes, amplitude changes.When vibration frequency, ω is reduced to 15.70rad/s by 94.2rad/s, and the amplitude of transverse direction sharply increases, and now screen(ing) machine covibration is serious, occurs that this situation is because now screen(ing) machine operating frequency just equals screen(ing) machine intrinsic frequency, occurs resonance.
Also can find out thus, the variation of operating frequency on amplitude impact obviously, therefore should be selected rational operating frequency in the time of design, makes it the intrinsic frequency away from screen(ing) machine, to ensure screen(ing) machine working stability, extends the screen(ing) machine life-span.
In the situation that keeping the radius of gyration and other running parameter constant, adjust the quality of two eccentric blocks, make the ratio of itself and difference be respectively 5:1,4:1,2.5:1, for the ease of paired observation, adjusting eccentric block keeps both sums constant with poor than time, thereby can obtain the center of mass motion track of different eccentric mass and poor ratio by emulation, as accompanying drawing 4.
Can find out from accompanying drawing 4 emulation, in the situation that the eccentric block radius of gyration is constant, as (m
1+ m
2)/(m
1-m
2) while reducing, the ratio of semi-minor axis length of elliptical orbit also reduces thereupon.Therefore can draw:
1), in the time that the eccentric block radius of gyration is constant, the change of eccentric block quality on amplitude impact obviously;
2) in the time that the eccentric block radius of gyration is constant, two eccentric block qualities with poor than the ratio of semi-minor axis length that has determined elliptical orbit, and ellipse long and short shaft is than reducing along with quality and poor reducing of ratio.
Be in fact in the time that the radius of gyration is constant, the variation of eccentric block quality has caused the change of exciting force size, and this point is by p=mr ω
2can release, therefore the ratio of the long and short axle of elliptical orbit is in fact that the exciting force size being produced by eccentric block determines.
At m
1initial phase and other running parameter situation about remaining unchanged under, change the initial phase declinate of two eccentric blocks, can obtain the center of mass motion track under different initial phase declinates, as accompanying drawing 5.
Can be found out by accompanying drawing 5 emulation, when phase angle Δ α increases or reduces originally, the shape (size of ovality) of elliptical trajectory does not change, and the size of vibrating direction angle (angle of transverse and x direction) changes, and when phase angle Δ α reduces originally, vibrating direction angle increases, and when phase angle Δ α increases originally, vibrating direction angle reduces.
It can be said that bright:
1) initial phase declinate does not affect the amplitude of x and y direction, and this is consistent with Analysis of Vibration Characteristic, and the size of amplitude and primary condition are irrelevant;
2) will change the vibrating direction angle of new elliptical vibration equal thick screen, the size that can adjust two eccentric block initial phase declinates realizes.
Because the transitional region between new elliptical vibration equal thick screen feeding end and exhaust end is K in spring rate
1with K
2between=∞, therefore, according to the difference of spring rate, and much smaller than with much larger than (M+m
1+ m
2) ω
2scope in appoint get the K value of multiple different spring rates, thereby can simulate the compass screen surface movement locus of different-stiffness.
By an accompanying drawing 6(left side) can find out, as spring rate K≤(M+m
1+ m
2) ω
2time, even if K changes within the specific limits, the shape of compass screen surface elliptical trajectory remains unchanged substantially, amplitude stability.Along with the increase of K, the shape of elliptical orbit also changes.
Equal operating frequency and be increased to K > (M+m when K crosses intrinsic frequency
1+ m
2) ω
2time, along with the increase of K, the major axis A B size of elliptical orbit constantly reduces, and minor axis CD size remains unchanged, and when long axis length is reduced to while approaching minor axis CD length, there is circular motion track in compass screen surface; When K further increases, AB direction amplitude can further reduce, and CD amplitude is constant, and in the time reaching infinity, the amplitude of AB direction is zero, and former minor axis CD length still remains unchanged, and therefore compass screen surface only does reciprocating linear motion with the amplitude of CD direction around pull bar.The movement locus of this figure and AB direction amplitude variations process have reflected the movement locus variation tendency of new elliptical vibration equal thick screen transitional region compass screen surface to a certain extent, illustrate that this region amplitude is ever-reduced along screen length direction.
The selection of detailed description of the invention 2 new elliptical vibration equal thick screen technological parameters
New elliptical vibration equal thick screen sieves mainly for the treatment of fine, and to improve screening efficiency and disposal ability as object, now selects screen angle α=10 ° of new elliptical vibration equal thick screen, vibrating direction angle β
1=45 °, operating frequency is n=900r/min, i.e. ω=2 π n/60 ≈ 94.2rad/s, and pan feeding section amplitude is 3mm, ellipse short shaft is 2mm.Design consideration dynamics and simulation analysis know, pan feeding section is successively decreased to the amplitude of discharge zone compass screen surface, and track is by elliptical trajectory to straight-line trajectory transition, and getting intermediate transition zone double-amplitude is 3～1.5mm, and discharge zone amplitude is chosen 1mm.
Can be calculated pan feeding section throwing index D according to the relevant parameter of choosing
enterbe 2.02, because the throwing index D of pan feeding section
enter> 1, therefore named justice is thrown beginning angle
having solution is 29.7 °, therefore material can be made sling movement, and 1.75 < D again
enter=2.02 < 3.3, therefore compass screen surface pan feeding section material is in middling speed sling movement state.By D
enter=2.02 or
make according to utilizing Matlab software
with θ
d, D and i
drelation curve, as accompanying drawing 7,8, can check in: cast angle θ aside
d=255 °, cast coefficient i aside
d=0.8, thus be 0.13m/s by the theoretical average speed that can be calculated pan feeding section compass screen surface material.
Because new elliptical vibration equal thick screen exhaust end is made approximate straight line motion, on this section of compass screen surface, do gliding motility.And there is reverse slide in material, just can slow down the transfer efficiency of compass screen surface to material, reduce the movement velocity of material.Therefore, slow down for realizing discharge zone mass transport speed, make material can occur reverse slide state.Oppositely slide index D therefore choose
q0> 1, gets D
q0=2～3, get sliding forwards index D
k0≤ 1.Because sieve plate adopts stainless steel, the static friction angle of choosing material and compass screen surface is μ
0=40 °, thus be β by calculating the vibrating direction angle of compass screen surface discharge zone
2=-31 °.
Because compass screen surface discharge zone horizontal direction amplitude is very little, now choose double-amplitude 2A=2mm, i.e. A=1mm, can be calculated, and oppositely slides index D
q0be 1.2, owing to oppositely sliding index D
q0> 1, therefore oppositely slide beginning angle φ
q0=239 °, therefore at this moment material there will be reverse slide on discharge zone compass screen surface, and may occur that the interval of reverse slide is
239 °～301 °, due to discharge zone throwing index D
row≈ 0.48 < 1,
without separating, therefore sling movement can not appear in material particles on this section of compass screen surface, only can do gliding motility, and do reverse gliding motility, establish coefficient of kinetic friction f=tan μ=0.7 of material to compass screen surface, dynamic friction angle μ=35 °, thereby by can be calculated reverse slide angle θ
q=111 °, reverse slide coefficient is i
q=0.3, material is 0.01m/s at the theoretical average speed of compass screen surface discharge zone reverse slide.
In compass screen surface middle transition interval, be to successively decrease to discharge zone from pan feeding section perpendicular to the amplitude of compass screen surface direction, equal x direction amplitude to y direction amplitude, compass screen surface is similar to circular motion.Therefore, interlude compass screen surface material particles should be by the projectile motion from pan feeding section to gliding motility transition.Interlude transitional region amplitude A=1.5～0.75mm, can be calculated in the time that compass screen surface vertical direction amplitude is decremented to A=1.5mm throwing index D
in≈ 1.38 > 1, name is thrown beginning angle
have solution, can there is sling movement in material, again 1 < D
in≈ 1.38 < 1.75, therefore material is in slight sling movement state.Along with further reducing of y direction amplitude, when just equaling x direction amplitude and be A=1mm to y direction amplitude, D
in≈ 0.92 < 1 name is thrown beginning angle
without separating, can not there is sling movement in material.
Interlude is during perpendicular to compass screen surface direction amplitude A=1mm, and compass screen surface material can not have been made sling movement, thus choose interlude amplitude A=1mm and 0.75mm, and by selected parameter ω=94.2rad/s, α=10 ° and static friction angle μ
0=40 °, calculate interlude sliding forwards index D
k0for being respectively 1.8 and 1.4.The sliding forwards index D of being obtained by A=1mm
k0=1.8, can calculate the sliding beginning angle of forward is 33.8 °, existing with dynamic friction angle μ=35 °, can be calculated the sliding only angle of forward
, forward slide angle θ
k=186.2 °, forward slide coefficient is i
k=0.52, the theoretical average speed 0.04m/s of transitional region.
The optimization of detailed description of the invention 3 new elliptical vibration equal thick screen prototype designs and optimum working parameter
For the processing performance of inspection institute's development of new oval-shaped equal-thickness sieve model machine, determine the optimum working parameter of screen(ing) machine, for this reason, according to the technical-economic index of " screening plant processing performance assessment method for the coal of GB/T15716-2005 " and screening process, select screening efficiency as investigating index, check by reasonable arrangement sieve test.Experimental factor water-glass, as shown in table 1, wherein, in test, have σ
2=21.0mm, test index is screening efficiency η, this value is the bigger the better.
Wherein
in α-former feed, be less than the content of screen size grade, %; In β-former feed, be less than the content of screen size grade, %; In θ-oversize, be less than the content of screen size grade, %.
Table 1 is tested factor water-glass
The object of this test is whether to have reciprocation between the best collocation in order to find out primary and secondary status on screening efficiency impact of factor excited frequency, eccentric block thickness, treating capacity and factor level and factor, select orthogonal experiment design method for this reason, adopt Minitab software to carry out experimental design, and the result of the test of carrying out Data Management Analysis and excellent scheme is predicted, inspection factor and the reciprocation conspicuousness on test index impact, determines optimum test condition with less test number (TN).
Select-13mm of test grade, ash content is 43.25%, the coal sample that free moisture is 2.10%, on new elliptical vibration equal thick screen experimental prototype, is used 6mm punching sieve plate, carries out dry screening, to determine the optimum running parameter of screen(ing) machine.
According to the selected orthogonal table of Orthogonal Experiment and Design and experimental factor, level, carry out orthogonal trial by Minitab, thereby obtain the testing program of table 2.
Table 2 orthogonal test scheme
According to the testing program of Minitab Software for Design, on experimental prototype, carry out according to the following steps screen experiments:
(1) at use for laboratory vibratory sieve, coal sample is carried out to prescreening, the coal sample of obtain-13mm grade;
(2) by obtain-standard screen (pass is identical with model machine compass screen surface) in the coal sample 6mm aperture of 13mm grade carries out classification, the Bed for Fine Coal of obtain-6mm grade and the Coarse Coal of 6-13mm grade;
(3), according to testing program feeding requirement, take by a certain percentage thick, the particulate coal sample of required quality, and mix, in order to test feed;
(4), according to testing program order, adjust the level of new elliptical vibration equal thick screen model machine parameter;
(5) open experimental prototype, after screen(ing) machine working stability, with manual time-keeping even feeding;
(6) weigh oversize and each section of quality of screenings, and with standard screen screening, then take particulate in screenings and oversize (6mm grade) quality, record data;
(7) cleaning compass screen surface, carries out next step test according to testing program order according to above step.
Carry out sieve test record data by above test procedure, obtain result of the test, in table 3
Table 3 result of the test
Result of the test shows, new elliptical vibration equal thick screen is when in the time that the eccentric block radius of gyration equates, driving shaft eccentric block thickness σ
1=35.0mm(driven shaft eccentric block thickness σ
2=21.0mm),, excited frequency f=13Hz, processing capacity Q=24.0kg/2min, the ratio of the long and short axle of screen(ing) machine elliptical trajectory is 4:1, and screen(ing) machine vibration number is 780r/min, and treating capacity is 5t/ (hm
2) time, the screening efficiency of screen(ing) machine is the highest, and when the coal screening that is 2.10% for free moisture, efficiency can reach 96.8%
Adopt Minitab software to analyze orthogonal experiments, the best collocation that obtains factor level is A
2b
1c
2, adopt Minitab software to predict, optimum test horizontal combination A
2b
1c
2gained screening efficiency prediction average, up to 98.6%, shows optimal level combination A
2b
1c
2prediction effect very obvious, gained screening efficiency is high.
Detailed description of the invention 4 new elliptical vibration equal thick screen screening with constant bed thickness demonstration tests
In sieve test, determine by the content of measuring pan feeding section, interlude and discharge zone compass screen surface undersize material whether the each section of material bed thickness of compass screen surface remains unchanged substantially, thus the screening with constant bed thickness principle of checking screen(ing) machine.
Be equally divided into three sections along screen length, taking at 0-200mm compass screen surface as I section (pan feeding section), 200-400mm compass screen surface as II section (interlude) and 400-600mm compass screen surface as III section (discharge zone), under each section of compass screen surface, with sheet iron is each the chute that connects material is installed.
According to definite new elliptical vibration equal thick screen model machine optimum working parameter, model machine parameter adjustment is good, open model machine, after working stability, be that 2.10% coal sample is carried out sieve test by step to free moisture, access respectively each section of undersize material the record of weighing with the groove that connects material, carry out under the same conditions double repeated experiment, obtained experimental result is recorded in table 4.
Table 4 screening with constant bed thickness demonstration test
Table 4(is continuous)
According to pan feeding section, interlude and the discharge zone screenings content of test gained, be that sieve amount is ordinate, and taking model machine feeding end to exhaust end screen length as abscissa, and draw scatter diagram with its mean value, can obtain along the screen length direction distribution map of sieve amount thoroughly, as accompanying drawing 9.
Novel oval-shaped equal-thickness sieve model machine with free moisture be 2.10% coal sample carry out sieve test gained thoroughly sieve amount along the distribution map of screen length, can find out, novel oval-shaped equal-thickness sieve is from pan feeding section to the interlude saturating sieve amount close to equal thick screen to the saturating sieve amount of discharge zone again, and the each section of material bed thickness of compass screen surface tends to balance substantially.Therefore, new elliptical vibration equal thick screen can be realized screening with constant bed thickness.
Claims (8)
1. a new elliptical vibration equal thick screen, employing hanging is installed, comprise screen box, biaxial inertial vibrator, flexible member, transmission mechanism, erecting by overhang and support, aperture is 6mm punching sieve plate, described screen box feeding end by two spring hangings on bracing or strutting arrangement, exhaust end is engaged on bracing or strutting arrangement by two rigidity connecting rods, the two ends of connecting rod are movable, described screen box screen angle is 10 °, described vibrator adopts synchromesh gear transmission biaxial inertial vibrator, be arranged near feeding end screen box, motor produces vibration by belt drives vibrator, due to the forced vibratory mechanism of gear couplings, make two exciting agencies keep a stable phase angle, rotate from making synchronous backward.Feed chute is installed in described screen box feeding end top; angle is 35 °～40 °; adopt sheet iron to make material feeding baffle; and vertical baffle side is near feeding end; described screen box exhaust end afterbody is installed discharge chute; and the horizontal spring of two little rigidity is installed, when preventing drive unit in startup or shutting down, because resonance produces strong waving, ensure the stability with transmission.
2. a kind of new elliptical vibration equal thick screen according to claim 1, it is characterized in that this vibratory sieve gradually changes from material feeding end to exhaust end along the elliptical vibration track of screen length, utilize the different impelling intensity that have along the different elliptical vibration tracks of screen length to realize screening with constant bed thickness.
3. a kind of new elliptical vibration equal thick screen according to claim 2, near it is characterized in that new elliptical vibration equal thick screen screen(ing) machine pan feeding section, compass screen surface is done elliptic motion, the ratio of the long and short axle of elliptical orbit has determined the shape of elliptical trajectory, middle transition region compass screen surface movement locus by elliptic motion gradually to circular motion transition, near exhaust end, compass screen surface vertical direction amplitude goes to zero, screen(ing) machine compass screen surface is made approximate straight line motion with less amplitude, and amplitude in pan feeding section vertical direction is greater than the amplitude in discharge zone vertical direction.
4. a kind of new elliptical vibration equal thick screen according to claim 2, is characterized in that the motion state difference of each section of compass screen surface material of new elliptical vibration equal thick screen.Material particles on pan feeding section compass screen surface is made middling speed sling movement at compass screen surface; Interlude transitional region compass screen surface material particles is made slight sling movement at compass screen surface, and along with the reducing of throwing index, gradually becomes sliding forwards motion; Because new elliptical vibration equal thick screen dynamic friction angle is greater than screen angle, can equal the sliding only angle of forward through reaching discharge zone forward slide angle after a while, forward slides and stops, and discharge zone is minimum perpendicular to the amplitude of compass screen surface direction, and now compass screen surface is done reverse gliding motility.
5. a kind of new elliptical vibration equal thick screen according to claim 2, is characterized in that screen angle α=10 °, eccentric block m
1initial phase be 90 °, eccentric block m
2with m
160 ° of initial phase declinates, operating frequency is n=900r/min, i.e. ω=2 π n/60 ≈ 94.2rad/s, feeding end pan feeding section amplitude is 3mm, vibrating direction angle β
1=45 °, pan feeding section throwing index D
enterbe 2.02, throw beginning angle
be 29.7 °, cast angle θ aside
d=255 °, cast coefficient i aside
d=0.8, the average speed of pan feeding section compass screen surface material is 0.13m/s.
6. a kind of new elliptical vibration equal thick screen according to claim 2, is characterized in that discharge zone amplitude is 1mm, exhaust end vibrating direction angle β
2=-31 °, reverse slide index D
q0be 1.2, oppositely sliding beginning angle
, oppositely sliding only angle
reverse slide angle θ
q=111 °, reverse slide coefficient is i
q=0.3, material is 0.01m/s at the average speed of compass screen surface discharge zone reverse slide.
7. a kind of new elliptical vibration equal thick screen according to claim 2, is characterized in that compass screen surface transitional region amplitude A=1.5～0.75mm, in the time that compass screen surface vertical direction amplitude is decremented to A=1.5mm, and throwing index D
in=1.38 > 1, name is thrown beginning angle
have solution, can there is sling movement in material, 1 < D=1.38 < 1.75 again, thus in slight sling movement state, when amplitude A=1mm, sliding forwards index D
ko=1.8, the sliding beginning angle of forward
, the sliding only angle of forward
, forward slide angle θ
k=186.2 °, forward slide coefficient is i
k=0.52, the average speed 0.04m/s of transitional region.
8. according to a kind of new elliptical vibration equal thick screen described in claim 5-7, while it is characterized in that the eccentric block radius of gyration equates, driving shaft eccentric block thickness σ
1=35.0mm, (driven shaft eccentric block thickness σ
2=21.0mm) excited frequency f=13Hz, processing capacity Q=24.0kg/2min, the ratio of the long and short axle of screen(ing) machine elliptical trajectory is 4:1, and screen(ing) machine vibration number is 780r/min, and treating capacity is 5t/ (hm
2) time, the screening efficiency of screen(ing) machine is the highest, and when the coal screening that is 2.10% for free moisture, efficiency can reach 96.8%.
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| CN114833070A (en) * | 2022-04-01 | 2022-08-02 | 中国矿业大学(北京) | Tower-shaped staggered laminated sieve |
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