Computer aided bolt ball node design

Shandong Da paste, Yang, milk (3) East Building Ball Guan Jin, Jinan attacking the law frame, net shell paste software development, proposed 7 color detection ball node design method. Using the =. soil feather 乇 analysis to determine the axial force and diameter of each rod can be based on the bolt ball node structure! Selection and repeated checking. And modify the design formula of the insects, and use the modified formula; and juice, can greatly reduce the workload of design and painting.

1 bolt ball joint structure and force mechanism The role of the bolt ball joint is to connect the round steel pipe rod and the steel ball. It consists of a steel ball bolt pin sleeve cone or sealing plate. 1. When the structure bears the load, the rod The internal force of the piece is transmitted through the bolt or the sleeve, and the force transmission route such as the tension bar boring head is formed into the sealing plate bolt bolt ball spit lever member cone head or sealing plate, the boring bolt ball can be used, and when the rod member is pulled, the sleeve is not force When the rod is under pressure, the bolt is not affected by the core. The paper is published in the core journal. Deng Yuwen Wang Shengchun female lecturer Qiao Hu Niansheng master graduate student 2 geometric constraints The size of the steel ball depends on the diameter of the snail 41 adjacent rod Clipping and snails go deep into the sphere and other factors. Literature 1.

(2) The geometric constraint formulas for the two adjacent snails and the adjacent two sets are not touched. In the literature 3, the angle between the two adjacent bars is less than 3, and the adjacent bars are not touched. Geometric constraint formula. In addition, the length of the sleeve must meet 3 sets of margins. The heart 2 is inserted into the threaded ball, so the outer dimensions of the sleeve should be based on the open-end wrench series.

3 The strength constraint bolt is designed for the tensile bearing capacity. 3 The smaller value of the area of ​​the nail hole at the thread should be taken. The tensile strength of the high-strength bolt is set by the heat.

The cargo slip is mainly to transmit pressure, and any section should be equipped with sufficient bearing capacity, and the pressure must be checked. Compressive bearing capacity design value sealing plate tensile bearing design value mouth cone degree, 1 is the cone top plate aperture; 2 is the steel strength design value; left is the cone head residual rate = 4 design method and formula modified from The above various formulas, regardless of the geometric relationship or the strength relationship, the bolt ball joint members are mutually restricted and mutually constrained, and the design method according to the primary selection + check 1 reselection is not only one, but heavy. Sometimes, due to small omissions, construction is difficult or impossible to construct. i 4.1 Design Steps Geometry and Formula 12 and normalization serialization require the selection of the reel for each bolt and the whiteness of the closure or cone. For each bolt, the maximum allowable tensile force of the bolt is calculated according to Equation 3; the maximum allowable tensile force of the sealing plate can be calculated from Equation 6; the cone head is obtained according to the formula, and the fire is allowed to pull. Compare the maximum allowable pull of the cone or seal to the maximum allowable pull of the bolt. Take the smaller one as the allowable pull of the bolt. The maximum allowable pressure of the sleeve corresponding to each bolt is then calculated by Equation 45. In this way, it is possible to establish a correspondence relationship between the maximum diameter of the bolt and the maximum diameter of the sleeve of the sleeve. After that, the node preparation component can be determined only by the axial force and the 矜杼. That is, 1 H, Lt is allowed to pull or allow pressure, the thickness of the cone or the sealing plate is 13 bolts, and the diameter of the steel ball is straight. The advantage of this method is only 1 soft force path to determine the node components, without having to undergo rechecking. The modification of the formula 42 is that the two snails of the spheroidal ball do not touch each other, and the ball diameter satisfies 2 to ensure that the sleeves of the adjacent two bars do not touch the diameter of the steel ball 23 for the length of the bolt into the steel ball. The ratio of the diameter to the bolt is 5=1.1; 1 is the ratio of the diameter of the circumcircle of the sleeve to the diameter of the bolt. Generally, the bucket is 1.8.

Ten plus bolt diameter; 5 is the length of the sleeve.

When determining the diameter of the bolt ball, it must be calculated according to the geometric constraint formula 8910, and take the larger one. If the design is completely according to the above formula, the next step is to determine the cutting plane height of each bolt hole of the steel ball. The height of the cut plane is not equal, and there may be multiple cut plane heights on the same ball, which causes inconvenience in designing the processing. In order to achieve the purpose of simplifying the design and production without making the ball diameter too large, this paper proposes to modify the formula 8.9 according to the principle that all the bolts on the same type of ball are flat and equal. According to the analysis formula 8.910, it can be seen that the diameter of the tangent plane corresponding to the two bolts with the diameter of the mountain core can be replaced by the diameter of the circumcircle of the sleeve corresponding to the largest bolt on the ball. After the above modification, although the diameter of each node ball will be increased, it can make the cutting height and the facet of each cut surface of the bolt ball of the same specification equal. 4.3 Program frame This program is used as the network software. Design the part of the sweat. Following the finite analysis of the rods, the steps described in the rods are established to establish various bolts.

Corresponding data between the maximum diameter of the sleeve cone or the maximum diameter of the sealing plate can be determined by comparing the axial force of each rod with the bolts, sleeve cones or sealing plates used for each rod. On this basis, according to the modified formula 8910, the ball diameter of each node is calculated, the most fired soil, the household series is taken as the diameter of the bolt ball at that point, and the calculation frame 5 is an example of the grid. The number 6 is 65. , the surrounding constraint, uniform load 4.8 continent, applied to the top layer, the direction is downward, the rod is from the private 83. Let 603.5忉6 4 start 94. And 04.5 kinds of Ge bar in the 1 move optimization selection, select the screw type user interface The maximum pressure value of the maximum tensile force in this blood can help the user determine the maximum bolt diameter quantity column to help the user to select the bolt series.

0mm140mm bolt ball bolt and bolt ball automatic matching result 4,5, unmarked serial number are l.

6 Conclusions can determine the various components of the node, avoiding the complicated steps of primary selection and re-election. The bolt ball design formula is modified, and the modified formula is used for design, which not only makes the design label. The machining process is simplified, and the ball diameter is smaller than other design methods, which reduces the amount of steel used in the joint. This is important for reducing the design workload, improving the standardization, improving the structural stress, and reducing the project cost. Turn down on page 267 1 Cao Zhigang Qian Yasheng Modern Communication Principles Jing Tsinghua University publishes private school 2 Fang Jun, Yu Yuqian. Information theory and coding. Beijing Electronics Industry Press, 1994.150 1803 Zhang Youzhi. Programmable logic devices, principles and applications. Beijing China Railway Publishing House, 1996.

2202404 Liu Baoqin. Human-only programmable logic devices and their applications. Beijing Tsinghua University Press, 1995.150 is connected to the 253 page 1 grid structure design and construction procedures. Grid structure design and construction. Beijing China Building Industry Press, 1995.179192 2 Zhejiang University of Architecture and Research Institute. Grid structure design and construction procedures. Beijing China Building Industry Press, 1991.18 3 Shen Zuyan, Chen Yangxuan. Grid and net shell. Shanghai Tongji University Press, 1996

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