CN2081975U

CN2081975U - Electronic scale for accurately quantitative filling of liquid

Info

Publication number: CN2081975U
Application number: CN 91201748
Authority: CN
Inventors: 钟洪; 高成滨; 史庆丰
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-01-28
Filing date: 1991-01-28
Publication date: 1991-07-31

Abstract

Disclosed is an electronic scale for accurately quantitative filling of liquid mainly used for filling barreled bean oil, in particular to automatic filling of any liquid requiring high precision fixed value. The electronic scale mainly comprises a microcomputer, a sensor (6), an electromagnetic valve (5), a weighing container (4), a rotary valve (2) and a stepper motor (3). A weighing sensor is adopted as a measuring element; the rotary valve is controlled to open and close by the microcomputer; weighing is carried out under a stable and static state at a moment; the quantity of liquid, which approaches to fixed quantity but less than the fixed quantity is filled; the rotation angle of the stepper motor and the opening and closing time of the stepper motor is determined by insufficient quantity and exact value is filled to. The utility model has the advantages of accurate weighing, high precision and no influence of the zero-point drift of electronic scale.

Description

Electronic scale for accurately quantitative filling of liquid

The utility model belongs to measuring apparatus, the quantitative electronic pouring scale of a kind of liquid high precision.

The utility model is mainly used in grain and oil storehouse quantitative filling and becomes bucket soya-bean oil, also can be used for the quantitative filling of other liquid.Grain and oil storehouse quantitative filling one-tenth bucket soya-bean oil mainly is to adopt mechanical scale to weigh at present, and error is big, metering is not accurate enough, and cheating phenomenon takes place easily.Patent documentation and interrelated data are not found and the same or analogous record of the utility model as yet by retrieval.

The purpose of this utility model is that for improving the precision of liquid quantitative filling, the minimizing error is increased work efficiency, thereby designed the quantitative electronic pouring scale of liquid high precision.

Particular content of the present utility model is as described below:

As shown in the figure, the utility model comprises command system and executive system, command system is made up of micro computer and program software thereof, and executive system is made up of oil pump (8), pipeline (7), solenoid valve (5), sensor (6), the container of weighing (4), stopcock (2) and stepper motor (3).Micro computer is according to the program directs executive system that weaves in advance, oil pump (8) is communicated with oil depot by pipeline (9) and is communicated with the container of weighing (4) by pipeline (7), solenoid valve (5) is contained on the pipeline (7), the outside top of the container (4) of weighing radially is equipped with three pressure transducers (6) and is supported the container (4) of weighing, 120 ° of five equilibriums are uniform at interval for three pressure transducers (6), in the lower end of the container of weighing (4) stopcock (2) is housed, stopcock (2) passes through the gear pair transmission by stepper motor (3).Be provided with the A/D conversion between sensor (6) and micro computer, the micro computer terminal can be connected to printer so that can amount cumulative total printed in record.

The utility model has the advantages that measuring accuracy height, error are little, easy and simple to handle, high efficiency is not subjected to the influence of filling liquid viscosity and can overcomes unfavorable factors such as the zero point drift of ordinary electronic scale own.

Fig. 1 is the structural principle synoptic diagram of the utility model executive system;

Fig. 2 is a principle of work block diagram of the present utility model.

Describe most preferred embodiment of the present utility model in detail below in conjunction with accompanying drawing:

With reference to accompanying drawing, with the edible oil in the quantitative filling grain and oil storehouse is example, structure division has been done concrete introduction in particular content, the utility model is when implementing, micro computer can be selected 8051 single-chip microcomputers for use, needs authorized strength work program according to user's quantitative filling is imported in the micro computer then, prints and printer and micro computer can be connected as need.

The course of work of native system and principle as shown in Figure 1, the oil of oil depot flows in the weighing container (4) through oil pump (8) and the solenoid valve (5) opened.The value of the continuous read sensor of computer (6) in the instrument box (10).When the liquid weight in the container (4) reached definite value, computer sent instruction, and valve is closed in termination of pumping.Stop (time increases and decreases according to the flow velocity size) stable back slightly and claim its weight, the liquid in container this moment (4) is slightly more than definite value, but can read an exact figure, is called " initial weight " temporarily.Make the stepper motor rotation then, stopcock (2) is opened fully, liquid flows into rapidly in the storing oil drum (1), the computer of this moment in the instrument box continuous access sensors again, when the difference (being the can value) of its true weight and initial weight reaches setting value (being that can is quantitative) soon, stopcock is closed in the stepper motor counter-rotating fully.Weigh up true weight after coming to a complete stop calmly slightly, go to subtract the realistic border of initial weight can heavy (be the amount of owing this moment certainly).What return after the amount of owing making stepper motor change a suitable angle again according to, again check weighing.Mend again as the amount of owing, until qualified.Because the memory and the calculation function of computer, guarantee that the benefit amount is inexcessive at the accurate corner and the working time of cooperation stepper motor.Owing to filling liquid is the difference of middle initial value of container (4) and back value, so the influences such as zero point drift of electronic scales itself have been overcome.The stopcock of draining the oil is installed in the outlet of draining the oil, and the influence that sticks container in the flow process has been eliminated owing to such device and this matching coordinative work, and high precision is quantitative accurately both to have guaranteed to get back due speed.

The latus rectum of stopcock should be selected greatly a bit to improve can efficient as far as possible, greatly to the diameter that inlet allowed of user's container (1).Excessive also of no use.During the benefit amount, because the height value of this moment is approximately constant (and known its approximate value) in the weighing container (4), its flow velocity is approximate constant, and then flow is directly proportional with the circulation area of section, so the corner of stopcock can more accurately be controlled the size of benefit amount.Flow does not become the simple proportional relation with flow area if stopcock is contained in the pump discharge place.The output analog quantity of three sensors (6) converts digital quantity input micro computer to through A/D, micro computer follow procedure accessing operation button and operating key, command pump (8), solenoid valve (5) as required, the corner of commander's stepper motor (3) and time and information shown by numeral or pilot lamp bright, go out and pass to the user, printer is mainly used in prints can amount and accumulative total barrelage, and printer is not indispensable.

Claims

1, the quantitative electronic pouring scale of liquid high precision, comprise command system and executive system, command system is made up of micro computer and program software thereof, executive system is by oil pump (8), pipeline (7), solenoid valve (5), sensor (6), the container (4) of weighing, stopcock (2) and stepper motor (3) are formed, it is characterized in that micro computer is according to the program directs executive system that weaves in advance, oil pump (8) communicates with the oil depot and the container (4) of weighing respectively by pipeline (9) and pipeline (7), solenoid valve (5) is contained on the pipeline (7), the outside top of the container (4) of weighing radially is equipped with three pressure transducers (6) and is supported the container (4) of weighing, 120 ° of five equilibriums are uniform at interval for three pressure transducers (6), stopcock (2) stopcock (2) is housed in the lower end of the container of weighing (4) passes through the gear pair transmission by stepper motor (3), be provided with the A/D conversion between sensor (6) and micro computer, the micro computer terminal can be connected to printer.