Precision Balance Balance-Magnification Mechanism with Mathematical Model of Motion
A mathematical model and precision balance technology, applied in the field of precision balance, can solve undiscovered problems and achieve the effect of saving research and development costs and saving research and development time
Inactive Publication Date: 2018-11-27
TIANJIN UNIV
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However, for the design method of the balance-amplification mechanism used in the weighing of the lever balance-amplification method, no specific theory has been found for the time being and a clear design method for guidance
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[0029] Such as Figure 7 As shown, taking the design of a laboratory balance with an accuracy of 1 milligram and a maximum capacity of 200g as an example, the specific embodiments of the present invention are set forth:
[0030]According to claim 4 and 5, first determine the range of lever ratio and x / y, here, we use electric current and electromagnet as force generating device, at this moment, the current detection accuracy of circuit board is 100nA, and this electric current can generate The force is 10E-6N, and the gravity generated by 1 milligram of weight is the measured force. This value is 10E-5N, so the value of x / y should be greater than 1 / 10, and the maximum force that the force generating mechanism can stably generate It is 0.5N, and the gravity generated by the mass with the maximum range of 200g is 2N, so the value of x / y should be less than 1 / 4. Considering the portability, the internal volume length of the designed laboratory balance is within 50cm, the width i...
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The invention discloses a motion mathematic model of a balance-amplification mechanism for a precision balance. The motion mathematic model comprises a flexible hinge parallel four-rod mechanism, a lever mechanism, a string draw mechanism and a supporting mechanism, which all form an integral molded rigid body. The flexible hinge parallel four-rod mechanism includes flexible hinges. The lever mechanism includes flexible hinges and rigid bodies at two sides of the hinges. The string draw mechanism includes flexible hinges and corresponding rigid bodes between the hinges. The approximation mathematic model of the motion model, containing parameters such as K1, K2, K3, l, x and y, is shown in the description. To-be-tested force F is forced applied to one end portion of the flexible hinge parallel four-rod mechanism, and D is displacement of the lever mechanism relative to the other end of the flexible hinge parallel four-rod mechanism when the to-be-tested force F generates gravity at the minimum precision quality. The beneficial effects of the invention are that the motion mathematic model of a balance-amplification mechanism is provided for the design of balances that need different precision requirements, a convenient approach is provided for research and development of a precision balance, the research and development time is saved, and the research and development cost is reduced.
Description
technical field [0001] The invention relates to a precision balance, in particular to a precision balance balance-magnification mechanism with a motion mathematical model. Background technique [0002] With the advancement of science and technology and the improvement of manufacturing technology, the requirements for high-precision weighing in various industries continue to increase. For example, in the fields of biomedical engineering and biopharmaceuticals, micro-mass analysis is often encountered. Accurate mass of reactants, in industrial production, often requires precise mass of materials. For the manufacture of precision balances, weighing by lever balance-amplification method is a commonly used method. For example, the invention patent application with publication number CN 104374451A discloses a single sensor mechanical structure for weighing. However, for the design method of the balance-amplification mechanism used in the weighing of the lever balance-amplificatio...
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IPC IPC(8): G09B23/10
Inventor 刘庆纲孙庚刘睿旭秦自瑞解娴
Owner TIANJIN UNIV