4.4 Application Example of Cylindrical Helical Tension Spring Figure 12-2-7 shows the balanced shoe brake of ZL50 wheel loader used in mines. Figure a is the structure diagram. Figure b is the force diagram. When braking, the piston of brake cylinder 2 is pushed out under the action of oil pressure. Press the two brake…
4.3 Tension adjusting structure of cylindrical spiral tension spring Table 12-2-28 Typical Structure of Tension Adjustment Structure type Instructions The end of the spring is made into a closed cone shape. Insert the screw with a ring and rotate the nut to adjust the tension of the spring The spring is installed on the nut…
4.2 Calculation Example of Cylindrical Helical Tension Spring Table 12-2-26 Calculation Example of Cylindrical Helical Tension Spring 1 Items Unit Formulas and Data Original condition Maximum tension Pn Minimum tension P1 Working range h Spring external diameter Number of load actions N Spring material End structure N N mmmm 350 176 12 ≤18 N<103times Carbon…
4.1 Calculation Formula of Cylindrical Helical Tension Spring Table 12-2-25 Item Unit Formulas and data Main calculation formula Material Diameter d mm d≥1.6√￣Pn KC/τp In the formula, τp is the allowable shear stress, which is selected as per Table 12-2-6 according to Class I, II and III loads K=(4C-1)/(4c-4)+0.615/C or Select according to Table 12-2-20 Effective…
4. Cylindrical helical tension spring The calculation of tension, deformation and strength of tension spring is basically the same as that of compression spring, except that the directions of force, deformation and stress are opposite. Therefore, the basic calculation formula of compression spring can also be applied to tension spring. The internal force formed by…
3.11 Application example of cylindrical spiral compression spring 1) Figure 12-2-3 shows the toothed claw fall arrester of mine single rope lifting cage. When the mine cage rises and falls normally, the spring 2 is compressed, and the toothed claw 10 is always open. When the steel rope connected to the main boom or the…
3.10 Pressure adjusting structure of cylindrical spiral compression spring Table 12-2-24 typical structure of pressure adjustment Structure Type Instructions During adjustment, loosen the nut 1, screw the nut 2, that is, the support seat, to the required position, and then lock the nut 1 During adjustment, loosen the locking screw 2, then adjust the support…
3.9 Calculation example of combined spring Table 12-2-23 Items Unit Formulas and Data Original condition Minimum working load P1 Maximum working load Pn Working range h Load properties Spring Type End Type Spring Material N N mm P1=340 Pn=900 h=10 Impact load Class II Tighten and grind both ends together Carbon Spring Wire Grade C…
Design and calculation of combined spring When the cylindrical helical compression spring with large load and limited installation space is designed, the combined spring can be used (Fig. 12-2-2). This kind of spring is lighter than ordinary spring, and the diameter of steel wire is smaller, so it is convenient to manufacture. When designing the…
Calculation of cylindrical helical compression spring Table 12-2-21 Calculation example of cylindrical helical compression spring 1 Items Unit Formulas and Data Original condition Minimum working load P1 Maximum working load Pn Working range h Spring outside Diameter D₂ Spring Type End Type Spring Material N N mm mm P1=60 Pn=240 h=36±1 D₂≤45 N=103~106 times The…
Coefficients C, K, K₁,8/πKC3 for calculation of cylindrical coil springs Taken from CB 1239- 2000 Table 12-2-20 calculation of cylindrical coil springs C K K₁ 8/πKC3 C K K₁ 8/πKC3 2.5 2.6 2.7 2.8 2.9 3 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9…
Calculation table of cylindrical helical compression spring Since the calculation of the spiral spring is more troublesome, the computer can be used to compile the relevant calculation formulas into various programs for design calculations if conditions permit. In addition, in order to quickly and easily determine the size and parameters of the ammunition, this calculation…
Stability, Strength and Resonance Check of Coil Springs (1) Compression spring stability check Compression spring with a larger height-diameter ratio b will bend laterally and lose its stability when the axial load reaches a certain value. In order to ensure stable use, the height-diameter ratio b=H/D should meet the following requirements: fixed at both ends …
Compression spring end form and height, formula for total Coils Table 12-2-14 Calculation formula of total Coils n1, free height H0, and compression height Hb Structure Type Coils n Free height H0 Compression height Hb Ends are not tight Not ground n nt+d (n+1)d Ends not tight 1/4 turn flat n+1/2 nt (n+1)d The end…
Parameter selection of cylindrical coil spring The first series to be used first. (1) Spring diameter D series dimensions Table 12-2-9 Spring diameter D series dimension mm 0.4 0.5 0.6 0.7 0.8 0.9 一 1.2 1.4 1.6 (1.8) 2 (2.2) 2.5 (2.8) 3 (3.2) 3.5 3.8 4 (4.2) 4.5 (4.8) 5 (5.5) 6 (6.5) 7…