CN2279596Y

CN2279596Y - Weighing card apparatus

Info

Publication number: CN2279596Y
Application number: CN 96222645
Authority: CN
Inventors: 尹名甲; 尹平
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-09-11
Filing date: 1996-09-11
Publication date: 1998-04-22
Anticipated expiration: 2006-09-11

Abstract

The utility model relates to a weighing card apparatus, which belongs to the technical field of mechanical measurement and weighing and can also belong to a computer card class. The utility model is composed of a filter, a signal amplifier, an integrator, a pulse generator, a counter and a controller, wherein, all electronic elements are welded on a printed circuit board on which a socket for externally connecting a sensor is arranged. The weighing card apparatus can be inserted on an I/O expansion slot of a microcomputer to form a weighing and force measuring apparatus and is used for large and medium-size electronic weighing apparatus needing to manage weighing data and object weighing data. The utility model solves the defect that weighing and data management need to use two sets of apparatuses, has simple structure and low cost, and fully exerts the function of a computer.

Description

The Weighing card device

The utility model belongs to the weighing technology of mechanics metering.Adopt current more popular a kind of microcomputer meter specially, instrument form-PC plug-in unit instrument.This invention can make, and mini-computer and resistance strain gauge force transducer are formed and can be weighed and the weighing system of thing tuple according to management to article, can carry out high-precision measurement to power value and weight.

The at present domestic big-and-middle-sized static electronic scale that is used for commercial clearing all adopts the indicator gauge (be secondary table) of display instrument as gravimetric value of weighing.The display instrument of weighing is a kind of monolithic processor controlled Intelligent Digital instrument.By a plurality of function buttons on the panel set, operations such as demarcation, zero clearing, peeling.Its product has Japan, the U.S. and homemade (comprising Taiwan) etc.These instrument not to the management function of gravimetric value,, gather inquiry etc. as tabulation substantially.Along with the continuous progress of business administration, a lot of users require to strengthen the management of symmetrical heavy articles.So manufacturer has developed RS232C serial oralia for the display instrument of weighing again, connect the composition weighing management system with the RS232C mouth of computing machine with lead.The weighing system of Zu Chenging is loosely organized like this, and outward appearance is not whole, and cost improves, and complex operation comes inconvenience for the user in generation.

For this reason, the utility model proposes a kind of simple in structure, the cheap Weighing card device that can directly be inserted on Computer I/O expansion slot.As long as the utility model is inserted in 286,386, on the I/O expansion slot of 486 microcomputers, just constitute the weighing system of a band management function, move multiple functions such as supporting software just can be set, demarcates, weighs, thing weight management.The user also can work out the application program of oneself as required.

Composition of the present utility model at most can be by eight as the external precision resister strain gauge transducer in figure (one) [1].[2] wave filter of forming by operational amplifier.[3] measured signal amplifier.[4] reference voltage amplifier.[5] integrator is to convert tested voltage signal to the time interval proportional with it.[6] null detector judges whether integration finishes.[7] pulse producer provides pulse to counter.[8] programmable counter is a special IC sheet, makes the time interval become digital signal.[9] controller is made up of analog switch, gate circuit and latch, control integrator when working procedure, and counter becomes corresponding digital signal with analog signal conversion reliably.

The device external form as figure (two) it actual be exactly a clamp that computing machine is used, all electronic components are welded on the double-sided printed-circuit board [1], are useful on fixing strip iron plate [2].Adorn a 9D type socket [3] above, be used for the outer meeting resistance strain gauge transducer.64 I/O lead-in wires [4] are arranged.Working sensor voltage provides by calculating the meter power supply.The excessive damage power supply of electric current when preventing that external sensor from breaking down, the spy has adorned insurance resistance [5].

The utility model principle of work: see figure (two), at first the computer instruction that is come by socket address bus and data bus with K switch 4, K2 closure, makes amplifier, integrator zero clearing.Then open the simultaneously closed K1 of K4, K2 and connect sensor, measured signal is added to the input end of integrator [5] behind wave filter [2], amplifier [3] like this, in the sampling time of regulation signal is carried out integration; Open the closed k3 of k1 then, the standard signal that adds reversed polarity at the input end of integrator [5] again carries out reverse integral, and unison counter (8) begins to count umber of pulse, until integrator is output as zero level, null detector action counting stops.Count results is stored in the register of counter, and one-shot measurement finishes.Data can be imported into the internal memory of computing machine by the data bus of I/O mouth, through quantizing and display process, just can be presented at gravimetric value on the fluorescent screen or deposit database in.In fact, integrator is once to the signal timing integration, once to the reverse quantitative integration of standard signal.The measured signal here is the voltage of sensor [1] output, and standard signal is the supply voltage of sensor.Pulse is provided by pulse producer [7], by controller [9] control integrator, the co-ordination of counter.

Of the present utility model by dress: as during use Weighing card to be inserted on any I/O expansion slot of motherboard, the iron plate of back is screwed on cabinet, resistance strain gauge force transducer is connected (if needing many sensors in parallelly to use), the software of packing into and wearing with card with 9D type plug-in unit on hard disk with Weighing card.Working procedure is just passable.The user also can oneself programme as required, provides interface with card software.

The utility model reaches the requirement of the JJG649-90 vertification regulation of country through on probation, satisfactory for result on 386,486 microcomputers.When 30 millivolts of maximum ranges of input, can read in 250000 pulses at most, switching rate per second 4 times.Can also be by programming to other power value, small DC voltage is measured.

Claims

1. one kind by the double integrator amplifier, counter, the Weighing card device that gate circuit and printed circuit board (PCB) are assembled into.Feature of the present invention is, this device is inserted on the I/O mouth expansion slot of 286,386 or 486 microcomputers, connects resistance strain gauge force transducer again and just constitutes dynamometry and weighing device.

2. according to the said Weighing card device of claim 1, what it is characterized in that the counter employing is programmable counter, and integrating amplifier is barricaded as by operational amplifier, and its sum counter is controlled by gate circuit by computing machine.

3. according to claim 1, each said Weighing card device in 2, it is characterized in that this device is a block length 110mm, wide 105mm, 62 I/O socket lead-in wires, be covered with the printed circuit board (PCB) of electronic original part above, be useful on the 9D type socket of outer meeting resistance strain force sensor on the plate

4. according to claim 1, each said Weighing card device in 2,3 is characterized in that this device is essential and with the supporting use of card software.