I. Introduction
1). There are two kinds of weighing instruments: one is non-automatic weighing instrument, and the other is automatic weighing instrument.
Non-automatic weighing apparatus refers to a weighing apparatus that requires operator intervention during weighing to determine whether the weighing result is acceptable.
Automatic weighing machine refers to: in the weighing process without operator intervention, can automatically weigh according to the pre-set processing program.
2). There are two weighing modes in the weighing process, one is static weighing and the other is dynamic weighing.
Static weighing means that there is no relative motion between the weighed load and the weighing carrier, and the static weighing is always discontinuous.
Dynamic weighing refers to: there is a relative movement between the weighed load and the weighing carrier, and the dynamic weighing has continuous and non-continuous.
2. several weighing modes
1）. Non-automatic weighing device
Occupy the vast majority of non-automatic weighing products in our lives, all belong to static weighing, and are non-continuous weighing.
2）. Automatic weighing device
Automatic weighing machines can be divided into three categories according to their weighing modes
⑴ Continuous dynamic weighing
Continuous cumulative automatic weighing device (belt scale) is a continuous dynamic weighing device, because this type of weighing device does not interrupt the movement of the conveyor belt, and the automatic weighing device for continuous weighing of bulk materials on the conveyor belt. We are used to “belt scale”, “screw feeding scale”, “continuous weight loss scale”, “impulse flowmeter” and so on belong to such products.
⑵ Non-continuous static weighing
“Gravity automatic loading weighing apparatus” and “discontinuous cumulative automatic weighing apparatus (cumulative hopper scale)” are discontinuous static weighing. The gravity type automatic loading weighing device includes “combination weighing device”, “accumulation weighing device”, “decrement weighing device (non-continuous decrement)”, “quantitative filling scale”, “quantitative packaging scale”, etc.; The “cumulative hopper scale” included in the non-continuous cumulative automatic weighing device belongs to this type of weighing device.
From the weighing state of the material called in the two types of automatic weighing devices, “gravity automatic loading weighing device” and “non-continuous cumulative automatic weighing device”, these two types of products are not “dynamic weighing”, then it must be “static weighing”. Although both types of products belong to the category of automatic weighing, they are automatic and accurate weighing of each bulk material under a pre-set procedure. The material has no relative movement in the carrier, and no matter how large the quantity value of each weighing, the material can always stay stationary in the carrier waiting to be weighed.
(3) Both continuous dynamic weighing and non-continuous dynamic weighing
“Automatic track scale” and “dynamic highway vehicle automatic weighing device” have both non-continuous dynamic weighing and continuous dynamic weighing. The “automatic weighing device” because it contains more varieties, the weighing scale, labeling scale, valuation label scale and other products are said to have relative movement between the load and the carrier, and belong to continuous dynamic weighing; Products such as vehicle-mounted weighing instruments and vehicle-combined weighing instruments are said to have no relative movement between the load and the bearer, and belong to non-continuous static weighing.
3. Concluding remarks
As a designer, tester and user, we must have a comprehensive understanding of a weighing device, and know whether the weighing device facing is “dynamic weighing”, or “static weighing”, is “continuous weighing”, or “non-continuous weighing”. Designers can better choose the most appropriate modules to design products suitable for field use; The tester can use the appropriate equipment and method to detect the weighing instrument; Users can better maintain and correctly use, so that the weighing instrument can play its due role.
Post time: Aug-07-2023