In the installation of screen must pay attention to screen the tightness of the vibration sieve, sieving efficiency will be appropriate tightness of vibrating screen, wire service life can be prolonged. General vibration sieve screen tension will be tight, so that the screen surface will be smooth, long service life and screen. So, how to screen tension vibration control of the East degree?

张紧筛网的静力分析沥青混合料搅拌设备振动筛所用筛网多为正交的钢丝编织而成，沿筛网纵向均布多根支撑梁作为支撑，可将筛网模型简化为静不定的多跨度连续梁。为利于筛上物料向前运动，筛面与水平面是成一定夹角的，筛网自重及物料作用力可分解成平行于筛面和垂直于筛面两部分，而平行于筛面的那部分作用力对筛网弯曲变形没有影响，因此我们只考虑垂直筛面的那部分载荷，且假定沿筛网长度方向载荷是均匀的。因筛网张紧后主要承受拉力、压应力和剪应力相对较小，因此两支撑之间的那部分筛网可当作两端承受拉力，中间承受均布载荷，内部只承受拉力的结构形式进行分析。两支撑梁间筛网 AB段受力如图 1 所示。以筛网长度方向为 X 轴，垂直于筛面方向为 Y 轴建立二维数学模型，在筛网AB 段上取微元 ds 弧段，其受力如图 2 所示。由∑X=0 得 Fx=Fx，∑Y=0 得Fy=Fy+qdx又因为增加支撑数目可减小筛网的最大变形量，使筛网更加平整，同时减小了筛网的最大应力值。同时对比不同支撑数目的筛网的等效应力云图也可以发现增加支撑数目不仅减小了最大应力值，筛网整体应力也更为均匀，减小了应力集中，改善了筛网的受力状况。

Static tension screen analysis of asphalt mixture with mesh sieve into the steel wire braid orthogonal mixing equipment vibration screen, along the longitudinal support beam are Buduogen as support, the mesh model is simplified as a multi span statically indeterminate beam. For the benefit of the material on the sieve screen surface of forward movement, and the horizontal plane is in a certain angle, the screen weight and material force can be decomposed into parallel to the screen surface and perpendicular to the screen surface of two parts, which is parallel to the screen surface force on the bending part of the screen does not affect the deformation, so we consider only the vertical sieve surface part of the load it is assumed that the load, and along the length direction is uniform mesh. Because screen after tensioning mainly under tension, compression and shear stress is relatively small, so that part of the screen between the ends of two support as tension, intermediate under uniform load, analysis the structure of internal only under tension. Two supporting beams subjected to screen AB as shown in figure 1. In order to screen length direction as X axis, perpendicular to the screen surface direction as Y axis to establish two-dimensional mathematical model, the element DS arcs in the screen AB segment, the stress is shown in figure 2. Fx=Fx Σ X=0 Σ Y=0 by Fy=Fy+qdx, and because the maximum deformation increases the number of support can reduce the screen, the screen more smooth, and reduce the maximum stress value of the screen. At the same time, the comparison of different number of equivalent mesh support stress nephogram can also find additional support not only reduces the number of maximum stress value, screen the whole stress more evenly, reducing the stress concentration, mesh improves the stress condition.

当支撑数目由2 增加到 3，或由 3 增加到 4 时，筛网变形量和应力值都有大幅的下降；但当支撑数目为 7 时，再继续增加支撑数时筛网变形量和应力值减小程度不再那么明显，而此时筛网变形量已完全满足使用要求。实际生产中，沥青搅拌设备振动筛采用分段式筛网，沿振动筛长度方向安装两张筛网，每张筛网支撑数目一般为 6 或 7。支撑数目的取值与筛网的长度、筛丝的材料和直径、载荷大小及平整度要求等因素有关，要综合以上因素合理选择。

When the supporting number increased from 2 to 3, or increased from 3 to 4, mesh deformation and stress values are greatly decreased; but when supporting the number of 7, and then continue to increase support number mesh deformation and reducing the value of degree less obvious stress, while the mesh deformation has to meet the use requirements completely. In the actual production, the sieve adopts piecewise mesh asphalt mixing equipment along the length direction of vibration, vibration screen mounted two screens, each screen number of the braces is generally 6 or 7. The value with the screen support length, number of screen wire material and diameter, load size and smoothness requirements and other factors, a reasonable choice to the above factors.

张紧力大小对筛网平整程度的影响为研究张紧力对筛网平整程度的影响，将张紧力设为变量，其它条件相同，统一采用 3 支撑形式，对比不同张紧力作用下筛网变形情况和应力大小。张紧力从 1000N 到 100 000N 间选取不同的取值，在 ANSYS 中进行仿真分析获得筛网最大变形量和等效应力最大值，将所得数据绘制成曲线如图 4 和图 5 所示。随张紧力不断增加，筛网变形量不断减小。曲线斜率随张紧力不断减小，说明随张紧力大小的增加，筛网变形量减小的速率不断降低。即当张紧力增大到一定范围后，再继续增大张紧力对筛网的变形影响不大，且无论张紧力多大，都不可能使得筛面绝对平整，这与理论分析结果是一致的。根据图 5 曲线不难看出，总体上应力大小随张紧力的增大而不断增加。在 1 000～20 000N范围内时，等效应力增大速率有较小的变化，原因是张紧力较小时，筛网变形量变化较大，由筛网变形产生的那部分应力也有较大变化。当张紧力大于 20 000N 时，筛网内应力主要以张紧拉力引起的拉应力为主，而变形引起的应力则影响很小，因此表现为等效应力与张

Effect of tension on the screen level of tension leveling degree of influence on the screen, the tension force is set as variables, the other conditions are same, unified by 3 support forms, deformation and stress screen contrast different tensioning force. The tensioning force from 1000N to 100 000N to select different values, carries on the simulation analysis to obtain the screen of maximum deformation and maximum equivalent stress in ANSYS, the data plotted in Fig. 4 and Fig. 5. As the tension increased, mesh deformation decreases. The slope of the curve with tension decreases, suggesting that increased the size of the tension, the screen deformation rate decreased continuously decrease. As the tension increases to a certain range, and then continue to increase tension not effect on the screen, and no matter how much tension, could not make the screen surface is flat, which is consistent with the results of theoretical analysis. According to the curve in Figure 5 is not difficult to see, the overall stress tension increases with increasing. In 1000 ~ 20 000N range, variation of equivalent stress increase rate is smaller, the reason is the tensioning force is small, mesh deformation changes greatly, the stress produced by the screen deformation has significant changes. When the tension is greater than 20 000N, the screen stress mainly tensional force caused by the tensile stress, the stress and deformation caused by the impact is very small, so the performance of the equivalent stress and tension

紧力呈线性关系，曲线在此阶段变为直线。

There is a linear relationship between the clamping force, curve at this stage into line.

针对张紧的筛网建立数学模型，理论计算得到筛网弯曲变形量与张紧力大小、支撑梁间距及载荷大小有关。1）增大张紧力和减小支撑间距都可以减小筛网弯曲变形量提高筛面的平整度。2）基于ANSYS建立筛网的有限元分析模型，研究了张紧力大小和支撑间距对于筛网弯曲变形量的影响规律，验证了理论分析的正确性。3）增加支撑数目可减小筛网弯曲变形量，但当支撑数达到一定值，再继续增大对筛网变形量的影响不再那么明显。另外增加支撑数目使筛网受力更为均匀，减小了应力集中。4）增大张紧力也可减小筛网的弯曲变形，但会使得筛网内应力变大。施加张紧力，使筛网承受一定的预应力对提高筛网平整度是有益的，但应小于安全许用值。

The screen tension to establish mathematical model, theory calculation mesh deformation and tension, supporting beam spacing and load size obtained. 1) increased tension and reduce the spacing of the support can reduce the bending deformation increase screen screen surface roughness. 2) ANSYS finite element analysis model based on a screen, the tension and the spacing of the support for the influence of bending deformation of screen, to verify the correctness of theoretical analysis. 3) increase the number of mesh support can reduce the bending deformation, but the supporting number reaches a certain value, and then continue to increase the effect of deformation on the screen no longer evident. The number of additional support to screen stress more evenly, reducing the stress concentration. 4) bending deformation increases tension can also reduce the screen, but will make the stress becomes large screen. Tension, so that the screen to withstand a certain prestressed to improve mesh smoothness is good, but should be less than the allowable value of safety