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排球教学通常应用的扣球教具是用两根橡筋将球悬挂在两物体之间,这种教具有较大弱点,即每扣一球后,球体产生晃动,不固定,而后,虽然改进成为“穿绳法、网袋法、固定法”等,减少了晃动,但用起来仍有不足,现介绍一种既省力又简便的扣球练习器。一、构造与安装 1.本练习器上部由一个固定槽钢和另一个能够上下滑动的槽钢套在一起,下部焊一个圆形夹球装置(弹性钢),夹球部位用橡胶等软制品包裹而成(见图1)。 2.安装有两种方法,可视场地条件任选(图2、图3)一种。二、特点与作用特点:安装简单,高度可调,造价低廉,使用方便,适用面广。
The spiking aid usually used in volleyball teaching is the use of two elastics to suspend the ball between two objects. This teaching has a big weakness, that is, after each ball is buckled, the ball shakes and is not fixed, and then, although the improvement becomes “Drawstring method, mesh bag method, and fixation method” have reduced the sway, but they are still insufficient for use. Now, a smashing exerciser that saves effort and is simple is introduced. First, the structure and installation 1. The upper part of the exercise equipment by a fixed channel steel and another can slide up and down channel steel sleeve together, the lower welding a circular clip ball device (elastic steel), the ball with rubber parts and other soft products Wrapped (see Figure 1). 2. There are two methods of installation, depending on the site conditions (Figure 2, Figure 3). Second, the characteristics and role of features: simple installation, height adjustable, low cost, easy to use, wide application.