Automatic switching device for bottom-loading balance weights

Abstract

The invention discloses an automatic switching device for bottom-loading balance weights. The device comprises a rotary disc rotating shaft, a balance scale pan, a rotary disc, a lug boss and a weigh beam, wherein the two ends of the rotary disc are provided with circular discs with grooves and the middle parts of the circular discs are connected through a rectangular block so as to form a symmetric structure; a cylindrical rotary disc rotating shaft capable of lifting and rotating is connected below the symmetric centre of the rotary disc; the balance scale pan is positioned below one circular disc end of the rotary disc and provided with the lug boss which passes through the grooves on the circular discs of the rotary disc; the height of the lug boss is slightly greater than the thickness of the rotary disc; and the balance scale pan is connected with the weigh beam. Because the device realizes automatic switching during the measurement, the operation such as manual switching of weights, opening and closing of a balance housing and the like are prevented and the measurement accuracy is greatly improved; and by using the balance with automatically switched weights, the number of division reaches 2*10<7>.

Description

technical field [0001] The invention relates to the field of mass measurement, in particular to a device for automatically exchanging weights of a dish-down balance. Background technique [0002] The present invention is only directed to under-dish balances for mass transfer. [0003] In the field of quality transmission, the repeatability of the balance is the most concerned, and the smaller the repeatability, the better. In the process of mass value transfer, the weight is the main standard, and the weight is a physical measuring tool subordinate to the balance. The balance is mainly used to reproduce the mass value of the weight. Therefore, the weighing performance of the balance is an important part of the mass transfer capability. With high-accuracy weights, high-accuracy balances must be matched to build high-accuracy weight standard devices. [0004] According to the provisions of "JJG99-2006 Weight Verification Regulations", all mass transmissions adopt the subst...

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Problems solved by technology

[0006]This manual weight exchange method introduces large measurement errors: (1) The balance windshield must be opened for weight calibration

The experimental results show that it takes 1 hour or even longer to switch on and off the windshield of a 20kg balance once, before the balance reading can stabilize. If you wait for the reading to stabilize, the temperature drift and time drift of the balance will become a new source of error

(2) The exchange of weights must have manual participation. When manual participation is involved, the position of the weights on the balance pan cannot be repeated; (3) The strength of the weights cannot be repeated, which may cause shock; (4) Human body heat radiation Affect the equivalence of the balance; (5) Human breathing, sweat on hands, etc. all affect the humidity near the balance pan, causing airflow disturbance, etc.

[0007]According to the "JJG99-2006 Weight Verification Regulations", in order to improve the measurement accuracy, the weight should be exchanged several times when the weight is passed, and the measured The average value of the result, multiple exchange of weights, also brings other disadvantages such as high labor intensity

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