It can meet the principle requirement that the measurement uncertainty is not greater than the maximum allowable error of the weighed instrument, and it also has the characteristics of convenient use, and has a strong vitality in the practice of weighing instrument verification. The replacement of standard weights in the verification of large scales is one of the frequently used and effective methods. The large scales we are talking about here refer to scales with a maximum weighing capacity of more than tens of tons. Historically, the verification of large scales has used a large number of weights, step by step with manual handling methods, to the maximum weighing capacity of the scale. This method has limitations, and can only achieve the verification that the maximum weighing is on the left and right weighing instruments. Later, large-scale weighing apparatuses used cylindrical weights or rectangular weights, and then equipped with corresponding transportation and lifting equipment. Usually, the lifting equipment is installed on the truck. The truck is responsible for the transportation of weights. The lifting equipment is responsible for loading and unloading the weights and placing the weights in a specific position. It constitutes a check truck that combines the dual functions of transportation and lifting. .
Whether the lifting equipment of the check truck can put the weight in a specific position depends on the arm length and flexibility of the lifting equipment. Some lifting equipment completes the task of placing the weight in a specific position of the scale according to standard procedures, which requires auxiliary methods suitable for it. If the cylindrical weight can be manually rolled to place the weight in a specific position, the rectangular weight must be placed in a specific position using a battery forklift. Technical institutions above the prefectural and municipal levels in all parts of China are equipped with checkweigher trucks. Generally, the load-bearing weight of checkweigher trucks does not exceed more than several tons, and the weight of trucks does not exceed many tons. With this method of weighing truck, it can only achieve the verification that the maximum weighing is on the left and right weighing instruments. Road and transportation regulations also do not allow trucks to carry any larger loads, so many countries stipulate that the maximum weighing capacity of truck scales is sufficient. However, the weighing capacity of large scales in our country has been developed to one or two hundred tons. It is very difficult for the verification agency to verify the maximum weighing (full scale) of these scales, but it must also achieve the verification of the maximum weighing (full scale) of the scales. This is particularly important for weighing instruments used for trade settlement, which is the responsibility of the certification body. To achieve the verification of the maximum weighing (full scale) of these scales, one of the methods is: equipped with a sufficient amount of standard weights, and the method of running a few more trips by the inspection truck to pull the full weight to achieve the maximum weighing of the scales Verification, this method is expensive and extremely uneconomical for verification occasions with long distances. Another method is to equip a certain amount of standard weights, look for suitable "substitutes" at the verification site, and use the standard weight substitution method to achieve the verification of the maximum weighing capacity of large scales.
The standard weight replacement method is to check large scales. Since the number of standard weights prepared cannot reach the amount required for the maximum weighing of the scale, other constant loads can be used instead of the standard weights for verification. First put the standard weights available at the verification site on the carrier of the weighed device and verify to the weighing that needs to be replaced; record the error of the weighing and find the "flicker point" (pre-reforming error) of the weighing The amount of the small weight, and then remove the standard weight, pay attention that the scale should not be empty; add the substitute to the carrier of the weighed instrument, and restore the original weight of the scale by adding a reduced substitute For the error status of the "flash point", the small weight used must be the same as the above; at this time, the standard weight under the previous replacement can be added to the carrier of the scale to verify the larger weighing of the scale; Until all the standard weights are added to the scale again, then replace the weight; repeat the replacement of the weight several times, until the maximum weight of the scale is verified. In the process of weight replacement, certain method errors will inevitably occur, and the main reason for these method errors is the repeatability of the weighed instrument, so the replacement of the standard weight should be proposed for the repeatability of the weighed instrument Corresponding requirements.
When verifying a weighing instrument that is larger than that, the standard weight replacement method can be used, but the standard weight must be available. The "standard weights that must be provided" rule, we think this requirement is too low, but this is an international regulation. In some provinces and cities in our country, in order to ensure the quality of the weighing instruments and the factory quality of the weighing instruments, the technical institutions that require the verification of large scale instruments must be equipped with the standard weights for the maximum weighing of the weighed instruments or the standard weights. Whichever is greater. Enterprises producing the following weighing instruments must be equipped with standard weights equal to the maximum weighing capacity, and those producing the above weighing instruments should be equipped with standard weights.
Main characteristics as below:
- Elaborately manufactures, stable and reliable quality.
- Modular design, small size, save space and greatly improved wiring efficiency.
- Easy to install
- LED action display, each action be absolutely clear to see.
- Custom design to adapt the needs of modern Cnc Machine tools.
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