CN103990553A - Drum of top-suspension type honey centrifugal machine - Google Patents

Abstract

The invention discloses a drum of a top-suspension type honey centrifugal machine. The drum comprises honey discharge holes. The honey discharge holes of the drum are oval holes, the oval short axes of the honey discharge holes are perpendicular to an annular stress direction, and the ratio of the long axis and the short axis of each honey discharge hole is a/b=2. The honey discharge holes are the oval holes, and accordingly the strength of the drum can be improved on the premise that the honey discharge capacity is not changed.

Description

The rotary drum of centrifuge for a kind of top suspension sugar

Technical field

The present invention relates to the rotary drum of centrifuge for top suspension sugar.

Background technology

Rotary drum is the vitals of centrifuge for top suspension sugar, if undercapacity can cause property loss and casualties; If but too emphasize that security performance must improve the cost of product, reduce the competitiveness of product, affect the economic benefit of enterprise, for this reason, how not increasing rotary drum cost and to reduce under production capacity, the intensity that improves as far as possible rotary drum is the problem that troubles people always.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of high-intensity rotary drum.

The rotary drum of centrifuge for top suspension sugar provided by the invention, comprises the sweet hole of row, and row's honey hole of described this rotary drum adopts slotted eye, and the ellipse short shaft perpendicular rings in described row's honey hole is to stress direction.

Described minor axis perpendicular rings is to the ellipse long and short shaft ratio in row's honey hole of stress direction

The present invention, because the sweet hole of row adopts slotted eye, arranges the ellipse short shaft perpendicular rings in sweet hole to stress direction, can not change under the sweet hole area of row, reduces the maximum stress value of rotary drum, can not change under production capacity, improves the intensity of rotary drum.

Accompanying drawing explanation

Fig. 1 is drum structure schematic diagram of the present invention;

Fig. 2 is that rotary drum of the present invention is arranged sweet pore size distribution schematic diagram

Fig. 3 is ANSYS FEM model schematic diagram of the present invention

Fig. 4 is the stress analysis figure in the sweet hole of the oval row of rotary drum of the present invention

Fig. 5 is existing rotary drum circular row honey hole stress analysis figure

Fig. 6 is that rotary drum of the present invention is arranged sweet hole and adopted finite element analysis software to try to achieve stress distribution cloud atlas;

Fig. 7 is that existing drum structure is arranged sweet hole and adopted finite element analysis software to try to achieve stress distribution cloud atlas;

The specific embodiment

As shown in Figure 1, top suspension sugar is arranged on rotary drum with row's honey hole ovalize of the rotary drum of centrifuge, and this arranges sweet hole minor axis perpendicular rings to stress direction, arranges sweet pore size distribution as shown in Figure 2.

Fig. 4 is the stress analysis figure in the sweet hole of the oval row of rotary drum, according to document document, (< < stress is concentrated > > [M], western Tian Zhengxiao work, Li Anding, Guo Tingwei translates, China Machine Press, 1986) in simple extension and the principle addition method of compression, the ellipse short shaft that rotary drum is arranged sweet hole is perpendicular to the maximum stress of circumference stress direction on ellipse short shaft, and its longitudinal end stress is

${\mathrm{\&sigma;}}_{b1}=\frac{\mathrm{\&sigma;}}{2}(1+2\frac{a}{b})-\mathrm{\&sigma;}=\mathrm{\&sigma;}(\frac{a}{b}-\frac{1}{2})---\left(1\right)$

Wherein, σ is Uniform Tension stress, and a is transverse value, and b is ellipse short shaft value.

Minor axis end points stress is

${\mathrm{\&sigma;}}_{b2}=\mathrm{\&sigma;}(1+2\frac{a}{b})-\frac{\mathrm{\&sigma;}}{2}=\mathrm{\&sigma;}(\frac{1}{2}+2\frac{b}{a})---\left(2\right)$

Formula (2) can be write as

${\mathrm{\&sigma;}}_{b2}=k_1\mathrm{\&sigma;},k_1=(\frac{1}{2}+2\frac{b}{a})---\left(3\right)$

In formula, k ₁for the maximum stress lumped parameter of ellipse short shaft perpendicular to circumference stress.

Fig. 5 is existing rotary drum circular row honey hole stress analysis figure, row's honey hole of existing rotary drum is small sircle hole, meanwhile, according to document, (< < stress is concentrated > > [M], western Tian Zhengxiao work, Li Anding, Guo Tingwei translates, China Machine Press, 1986) in simple extension and the principle addition method of compression, it is known that to be subject to the circumference stress value of interior pressure rotary drum (Fig. 5) be the twice of longitudinal stress value, i.e. σ _x/ σ _y=2.

Therefore, on rotary drum, the stress of small sircle hole can be tried to achieve:

${\mathrm{\&sigma;}}_c=\frac{\mathrm{\&sigma;}}{2}(1+\frac{{\mathrm{\&rho;}}^2}{r^2})-\frac{\mathrm{\&sigma;}}{2}(1+\frac{{3\mathrm{\&rho;}}^4}{r^4})\cos 2\mathrm{\&theta;}+\frac{\mathrm{\&sigma;}}{4}(1+\frac{{\mathrm{\&rho;}}^2}{r^2})-\frac{\mathrm{\&sigma;}}{4}(1+\frac{{3\mathrm{\&rho;}}^4}{r^4})\cos (\mathrm{\&theta;}-\frac{\mathrm{\&pi;}}{2})---\left(4\right)$

In formula: ρ is little pore radius, r is the distance between the aperture center of circle and micro unit, and θ is that effect of stress direction and micro unit are with the angle between small sircle hole circle center line connecting.

By (4), known, at r mono-regularly, when time, the maximum stress stress value on r is

${\mathrm{\&sigma;}}_{c1}={\mathrm{\&sigma;}}_{c2}=\frac{3\mathrm{\&sigma;}}{4}(\frac{4}{3}+\frac{{\mathrm{\&rho;}}^2}{r^2}+\frac{{\mathrm{\&rho;}}^4}{r^4}),k_2=\frac{3}{4}(\frac{4}{3}+\frac{{\mathrm{\&rho;}}^2}{r^2}+\frac{{\mathrm{\&rho;}}^4}{r^4})---\left(5\right)$

In formula, k ₂it is the maximum stress lumped parameter of small sircle hole.

In formula (5), when r=ρ, the maximum stress lumped parameter k of small sircle hole ₂=2.5.

According to transverse a, be greater than minor axis b, b/a < 1, and hence one can see that, k ₁< k ₂, arrange sweet hole and adopt minor axis to be less than perpendicular to the rotary drum maximum stress value of the elliptical aperture of circumference stress the maximum stress value that the sweet hole of row adopts the rotary drum of circular hole, do not changing under the sweet ability of row, obviously can improve the intensity of rotary drum.Now, if minor axis perpendicular rings to the ellipse long and short shaft ratio in the row honey hole of stress direction time, by formula (5), to be known, this maximum stress value of arranging sweet hole is k ₁=1.5, its value is less than the maximum stress lumped parameter k of the small sircle hole in the sweet hole of row ₂=2.5.

For top suspension sugar, with centrifuge, without strengthening hoop drum structure, use finite element software to carry out simulation calculation, its main structure parameters relative dimensions is as shown in table 1.Because bowl is axial symmetry parts, in order to reduce, assess the cost, according to the sweet pore size distribution rule of row, getting rotary drum 1/70 is a modeling unit, use APDL to set up ANSYS parameter finite element model, analyze rotary drum stress distribution and concentrate situation with the sweet hole of row stress, finite element analysis model as shown in Figure 3.Arrange sweet hole and select an ellipse, oval-shaped minor axis is perpendicular to circumference stress direction, and its corresponding size parameter is a/b=2mm, another kind of row selects circle in sweet hole, its corresponding size parameter is: radius r=4mm, and SOLID186 is selected in unit, for guaranteeing the mesh quality in hole, adopt swipe grid division, the unit of the sweet hole of round row rotary drum FEM model adds up to 125490, and model unit adds up to 163782, and drum inner wall loads the centrifugal hydraulic pressures such as material, screen cloth, press maximum speed operating mode (1060rpm) and calculate, consider the impact of centrifugal force and gravity.

Table 1 drum structure size

Respectively as shown in Figure 6 and Figure 7, Fig. 6 is that rotary drum of the present invention is arranged the stress distribution cloud atlas that sweet hole adopts ellipse to utilize finite element analysis to obtain to its maximum von Mises equivalent stress cloud atlas result of calculation; Fig. 7 is that existing structure rotary drum is arranged the stress distribution cloud atlas that sweet hole adopts circle to utilize finite element analysis to obtain, by Fig. 6 and Fig. 7, known, under the conditions such as identical pore size distribution parameter, analysis type, grid fine degree and restraint forces, the circular hole of homalographic and the maximum equivalent of elliptical aperture appear at the second round place, rotary drum top, and are positioned at the two ends up and down of rotary drum axial hole.Circular hole maximum stress is 402MPa, elliptical aperture maximum stress is 280MPa, and the circumferential two ends stress in hole is lower, visible, adopt ellipse to arrange the suffered maximum stress level of sweet hole rotary drum lower than circular hole, consistent with the Stress calculation analysis result of Elasticity.

Claims (2)

1. a rotary drum for centrifuge for top suspension sugar, comprises the sweet hole of row, it is characterized in that row's honey hole of this rotary drum adopts slotted eye, and the ellipse short shaft perpendicular rings in described row's honey hole is to stress direction.

2. the rotary drum of centrifuge for top suspension according to claim 1 sugar, is characterized in that the ellipse long and short shaft ratio in the sweet hole of described row $\frac{a}{b}=2.$