Design and calculation of the design and application of the torsion bar spring of highway filling machine. Xue Fengying, Tang Ping, and Anshan University of Science and Technology, Wei Chunyu, have designed and analyzed their design features.
The highway filling machine (hereinafter referred to as the filling machine) is integrally installed on a trailer and is towed by a motor vehicle during work. The trailer is composed of a vehicle body, a torsion shaft system and a wheel assembly, wherein the torsion shaft shaft bears the entire weight of the vehicle body and the entire filling machine. When driving on the expressway, because the vehicle body is equipped with high-temperature asphalt mixing tanks and other equipment, such as the use of ordinary springs (such as cylindrical coil springs, leaf springs, etc.) to buffer the vibration, it will cause the car body to be high, resulting in the vehicle does not run Smooth, so I used a torsion shaft system consisting of torsion bar springs.
1 design and calculation of the torsion bar spring! It is the force model of the torsion bar spring.
The structural parameters of the torsion bar spring: - the load acting on the vertical direction of the end of the arm, the initial angle of the center line of the arm and the horizontal line, '0 1.1 The stiffness of the load point is known, for the torsion bar of the circular section, The spring stiffness of the load acting point along the load direction is: 1.2 The amount of static deformation and the torsion angle under load (1) The static deformation is the same as other springs. The static deformation of the torsion bar spring is defined as any point on the over characteristic curve. The distance between the intersection of the tangent and the abscissa axis and the value of the tangent point on the abscissa axis (see), substituted into the known value, get: /2 = 60.48mm spring under the action of the load F, the arm is relatively The corner of the horizontal line is, by knowing, substituting the values, it is: "1=48.18. 1.3 The torsional shear stress will be substituted with (6) and related data. The hollow rod of the torsion bar is made of carbon spring steel or alloy spring steel. For example, 45C: NiMVA), obviously, if it is not specially treated, it will cause poor welding performance. Therefore, the torsion bar section should adopt a solid circular shape, so that the spline tooth shape can be directly processed at both ends without welding. In order to avoid excessive stress concentration, the transition fillet at the joint between the end and the rod is taken. 3. In order to make the torsion bar only bear the pure torsional load, it does not bear the vertical load and bending moment generated by the weight of the car body. The hollow shaft head is installed at both ends and supported in the end fixing block. The entire torsion shaft is surrounded by a square steel tube, which reduces the weight and facilitates the processing. At the same time, in order to reduce the friction between the hollow shaft head and the end fixing block, the filling is performed. The oil cup is lubricated with grease.
Since the filling machine needs manual loading during work, the height of the car body directly affects the operation. In addition, the high temperature heating kettle requires lowering the center of gravity to improve the stability during operation. The torsion bar spring is used, and the torsion angle of the arm is used, and the torsion bar spring can be used as the height of the car body. Since the deformation energy per unit volume is large, the torsion shaft itself is equipped with a torsion bar, and the structure is simple. Compact, it can be used for buffering and damping without additional springs, which greatly reduces weight and reduces space.
3 Conclusion In summary, the torsion bar spring is used as the torsion shafting system in the highway filling machine, which has novel structure and unique concept. It should be pointed out that due to the relatively high working stress of the torsion bar spring, the manufacturing and processing technology requirements are strict, and the maintenance should be paid attention to. In the place where the oil cup is installed, the oil should be injected regularly. For transportation purposes, the end block can be self-lubricating (such as oil-impregnated bearings).
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