What Is a Spring Scale?

The spring scale is also called a spring dynamometer, which is a device for measuring the magnitude of the force made by utilizing the relationship between the deformation of the spring and the external force. Spring scales are divided into two types: pressure and tension. The pressure on the tray of a pressure spring scale is equal to the weight of the object, and the angle of the scale's pointer rotation indicates the value of the pressure. The lower end of the tension spring scale is connected with a hook (the hook is connected with the lower end of the spring), and the upper end of the spring is fixed on the ring on the top of the shell. When the object to be measured is hung on the hook, the spring is extended, and the pointer fixed on the spring is lowered. Because the elasticity of the spring is proportional to the external force within the elastic limit, the magnitude of the force or the weight of the object can be read directly from the scale value on the housing indicated by the pointer of the spring scale.

The spring scale is also called a spring dynamometer, which is a device for measuring the magnitude of the force made by utilizing the relationship between the deformation of the spring and the external force. Spring scales are divided into two types: pressure and tension. The pressure on the tray of a pressure spring scale is equal to the weight of the object, and the angle of the scale's pointer rotation indicates the pressure value. The lower end of the tension spring scale is connected with a hook (the hook is connected with the lower end of the spring), and the upper end of the spring is fixed on the ring on the top of the shell. When the object to be measured is hung on the hook, the spring is extended, and the pointer fixed on the spring is lowered. Because the elasticity of the spring is proportional to the external force within the elastic limit, the magnitude of the force or the weight of the object can be read directly from the scale value on the housing indicated by the pointer of the spring scale.

When using it, pay attention that the measured gravity or force does not exceed the measurement range of the spring scale. You should also check whether the pointer is at the zero scale when the spring scale is not hanging objects. If it is not at the zero scale, you can correct it. In addition, care should be taken not to cause the spring and pointer to rub against the housing, so as to avoid excessive errors.

Spring scale introduction

Spring scales are divided into two types: pressure and tension. The pressure on the tray of a pressure spring scale is equal to the weight of the object. The angle of rotation of the scale pointer indicates the value of the pressure. The lower end of the tension spring scale is connected with a hook (the hook is connected with the lower end of the spring), and the upper end of the spring is fixed on the ring on the top of the shell. When the object to be measured is hung on the hook, the spring is extended, and the pointer fixed on the spring is lowered. Because the elasticity of the spring is proportional to the external force within the elastic limit, the magnitude of the force or the weight of the object can be read directly from the scale value on the housing indicated by the pointer of the spring scale.

Use of spring scales

When using it, pay attention that the measured gravity or force does not exceed the measurement range of the spring scale, and also pay attention to the graduation value on the spring scale. Check whether the pointer is at the zero scale when the spring scale is not hung, if it is not at the zero scale, you can twist the pointer to perform Amended. The direction of the measured force shall be along the axis of the spring. Before hanging the object, it is best to gently pull the hook back and forth several times to prevent the spring pointer from getting stuck on the case. In addition, care should be taken not to cause the spring and pointer to rub against the housing, so as to avoid excessive errors.

Spring scale physics

An instrument for measuring the mass of a measured object by using the deformation of the spring under the action of the gravity of the measured object.

The spring has a characteristic of generating a deformation corresponding to an external force after receiving a force. According to Hooke's law, the amount of deformation of a spring within its elastic limit is proportional to the amount of force it receives. When weighing, the elastic force generated by the deformation of the spring is balanced with the weight (gravity) of the measured object, so the weight of the measured object can be measured from the amount of deformation, and its mass can be determined. Spring scales can weigh from 1 mg to tens of tons. Among them, quartz wire springs are used for loads below 2mg; flat coil springs are used for loads below 5g; coil springs and disc springs are used for larger loads.

Spring scale

Common spring scales are spring case scales made of coil springs. It can be seen from Figure 2 that after the measured object is placed in the weighing pan, the coil spring is stretched under the gravity of the measured object. During the stretching process, the rack is moved linearly by the lever device to drive the gear pointer shaft to rotate. When the elastic force generated by the spring is balanced with the gravity of the measured object, the pointer indicates the weight of the measured object on the scale.

Spring scales have the advantages of simple structure and intuitive reading. However, because the spring has the characteristics of elastic hysteresis and is easily affected by changes in external conditions such as temperature, its accuracy and sensitivity are low. In addition, its weighing results also vary depending on the acceleration of gravity.