CN202195875U

CN202195875U - Electro-optic analytical balance

Info

Publication number: CN202195875U
Application number: CN2011202322124U
Authority: CN
Inventors: 孟凡强
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-07-04
Filing date: 2011-07-04
Publication date: 2012-04-18
Anticipated expiration: 2021-07-04

Abstract

The utility model discloses an electro-optic analytical balance with a rough weighing device, comprising a lifting pivot, a weighing sensor arranged below a weighing tray for converting pressure into a voltage signal, an amplifying circuit for amplifying a voltage signal, an analog-to-digital converter for converting a voltage analog signal into a digital signal, a display for displaying the digital signal, wherein the output end of the weighing sensor is connected with the amplifying circuit, the output end of the amplifying circuit is connected with the analog-to-digital converter, the output end of the analog-to-digital converter is connected with the display, and the weighing sensor is connected with the lifting pivot. In the utility model, an object to be weighed is roughly weighed in the analytical balance when the electro-optic analytical balance is used, the process of transferring the object for weighing is removed, the operation is convenient, and the object to be weighed is prevented from being polluted to avoid affecting the weighing precision.

Description

Photoelectric analytical balance

Technical field

The utility model relates to a kind of photoelectric analytical balance, is specifically related to a kind of photoelectric analytical balance that has rough meausring apparatus.

Background technology

Half mechanical type, fully mechanical photoelectric analytical balance are still used widely in chemical analysis field at present; Generally comprise balance beam, pillar, hanger, the fulcrum edge of a knife, ring sign indicating number, ring sign indicating number index dish, stipule, damper, scale pan, pan arrest, pointer, projection screen, day plain bonnet, up-down pivot, fine motion adjuster bar, day flatfoot, balance adjustment screw; But this balance is cumbersome when weighing is operated; Mainly be because for the range and the guestimate that prevent to be surpassed analytical balance by the quality of weighed object by the quality of weighed object; Weighing in the lower general utility balance of precision earlier; Estimate by the coarse value of weighed object quality, transfer to weighing once more in the photoelectric analytical balance then, draw by the exact value of weighed object quality.Such process not only troublesome poeration, time is long, and must be to being carried out protection by weighed object, in order to avoid contaminated in transfer.

Summary of the invention

The purpose of the utility model is the above-mentioned deficiency that exists to existing photoelectric analytical balance, and a kind of photoelectric analytical balance that has rough meausring apparatus is provided.

The purpose of the utility model realizes through following technological means: comprise the up-down pivot, be located at claim below the thing dish be used for pressure convert into voltage signal LOAD CELLS, be used for amplification voltage signal amplifying circuit, be used for voltage analog signal convert into digital signal analog to digital converter, be used for the display of display digit signal; The LOAD CELLS output terminal connects amplifying circuit; Amplification circuit output end connection mode number converter; The analog to digital converter output terminal connects said display, and LOAD CELLS is connected with the up-down pivot.

LOAD CELLS in the utility model also can be arranged on the pan arrest of claiming the thing dish, and pan arrest is connected with the up-down pivot, and the pivot that gone up and down control moves up and down.

The utility model has further solved the problem that prevents to claim to be damaged above the balance range by the quantity of material amount balance; For solving this technical matters; The utility model also comprise be used to judge by weighed object quality and analytical balance amount claim size comparer, locking device, be used to control locking device coil, be used for the on-off circuit of drive coil; Amplifying circuit connects the comparer inverting input, and the comparer in-phase input end connects a burning voltage, and output terminal connects on-off circuit; The on-off circuit connecting coil, coil control locking device.Locking device by have the hole on ferromagnetic locking bolt, day plain bonnet base plate, the lock hole on the up-down pivotal axis is formed, an end of locking bolt locks the bolt other end and stretches into lock hole through the hole on the sky plain bonnet base plate near an end of coil.

When being claimed less than the photoelectric analytical balance amount by the weighed object quality, comparer output output high level, electric current is passed through in on-off circuit work in the coil, the release locking device, analytical balance could be worked, otherwise analytical balance can not be worked.

Compared with prior art the utlity model has following tangible advantage: the rough weighing by weighed object is accomplished in analytical balance; Saved the process that weighed object shifts; Easy to operate, avoid contaminated and influence the precision of weighing by weighed object, and can prevent to claim to be surpassed the balance range and damage the problem of balance by the quantity of material amount.

Description of drawings

Fig. 1 is the structural representation of first embodiment of the utility model;

Fig. 2 is the signal flow diagram of first embodiment of the utility model;

Fig. 3 is the structural representation of second embodiment of the utility model;

Among the figure, 1-claims the thing dish, the 2-LOAD CELLS, and the 3-lead, the 4-PCB plate, the 5-display, the 6-projection screen, the 21-pan arrest, the 7-comparer, the 8-on-off circuit, the 9-coil, the 10-locking device, 101-locks bolt, 102-hole, 103-up-down pivotal axis, 104-lock hole.

Embodiment

Below in conjunction with description of drawings and embodiment the utility model is done further to describe in detail:

Be illustrated in figure 1 as the structure of the utility model first embodiment; Below the title thing dish 1 of photoelectric analytical balance, being provided with below LOAD CELLS 2, the LOAD CELLS 2 is pan arrest 21; The pcb board 4 that LOAD CELLS 2 connects in projection screen 6 bases through lead 3; Amplifying circuit, analog to digital converter, display 5 are arranged on the pcb board 4, and pan arrest is connected with the up-down pivot, and the pivot that gone up and down control moves up and down.

Be illustrated in figure 2 as the utility model first embodiment signal flow diagram, LOAD CELLS 2 is used for converting pressure into voltage signal, and output terminal connects amplifying circuit; Amplifying circuit is used to amplify the voltage signal of input, output terminal connection mode number converter; It is digital signal that analog to digital converter is used for analog signal conversion, and output terminal connects display; Display 5 is used to show the digital signal of input.

Be illustrated in figure 3 as the structure of the utility model second embodiment, be, increase comparer 7, on-off circuit 8, coil 9, locking device 10 with the difference of first embodiment.Comparer 7 is made up of operational amplifier A; The in-phase input end of operational amplifier A connects a stable voltage; Inverting input connects the output terminal of amplifying circuit, between inverting input and output terminal, meets diode D, and inverting input connects the positive pole of diode D; Output terminal connects the negative pole of diode D, the input end of output termination on-off circuit 8; On-off circuit 8 is made up of triode G, and base stage is an input end, grounded emitter, and collector connects power Vcc through coil 9.The hole 102 of the locking bolt 101 that locking device 10 is processed by ferrous material, day plain bonnet bottom surface and the lock hole 104 on the up-down pivotal axis 103 constitute, and an end of locking bolt 101 is near an end of coil 9, and the other end passes hole 102 and stretches into lock hole 104.

Comparer 7 receives the amplifying circuit output voltages, and when this voltage during less than the burning voltage of the expression balance range of setting, output is greater than the high level of zero potential; On-off circuit 8 states of working in out, through electric current, the magnetic field suction of generation locking bolt 101 moves up in the coil 9; The other end hole 104 that goes out of lock of locking bolt 101; Allow up-down pivotal axis 103 to rotate, thus the release balance, and balance could be worked; When comparer inverting input voltage during greater than the burning voltage of the expression balance range of setting; Comparer output is less than the low level of zero potential, and on-off circuit 8 works in off status, does not have electric current in the coil 9; Can't produce magnetic field suction locking bolt 101 moves; Since the acting in conjunction of locking bolt 101 and lock hole 104, up-down pivotal axis 103 moving can't rotations, and balance can not be worked.The effect of diode D be the low level that makes comparer output become-0.3V～-0.7V, protection switch circuit 8 makes it to be in normal duty.

In a word, the utility model provides a kind of photoelectric analytical balance that has rough meausring apparatus, saved process that weighed object shifts, easy to operate, avoid contaminated and influence the precision of weighing by weighed object.The above; Be merely a part of embodiment of the utility model; The protection domain of the utility model is not limited thereto; Any technician who is familiar with the present technique field is in the technical scope that the utility model discloses, and the variation that can expect easily or replacement all should be encompassed within the protection domain of the utility model.

Claims

1. photoelectric analytical balance; It is characterized in that: comprise the up-down pivot, be located at claim below the thing dish be used for pressure convert into voltage signal LOAD CELLS, be used for amplification voltage signal amplifying circuit, be used for voltage analog signal convert into digital signal analog to digital converter, be used for the display of display digit signal; Said LOAD CELLS output terminal connects said amplifying circuit; Said amplification circuit output end connects said analog to digital converter; Said analog to digital converter output terminal connects said display, and said LOAD CELLS is connected with said up-down pivot.

2. photoelectric analytical balance according to claim 1 is characterized in that: also comprise pan arrest, said pan arrest is located at below the said LOAD CELLS, and said pan arrest is connected with said up-down pivot.

3. photoelectric analytical balance according to claim 1; It is characterized in that: also comprise be used to judge by weighed object quality and analytical balance amount claim size comparer, locking device, be used to control said locking device coil, be used to drive the on-off circuit of said coil, said amplifying circuit connects said comparer inverting input; Said comparer in-phase input end connects a burning voltage, and output terminal connects said on-off circuit, and said on-off circuit connects said coil.

4. photoelectric analytical balance according to claim 3; It is characterized in that: said locking device by have the hole on ferromagnetic locking bolt, day plain bonnet base plate, the lock hole on the up-down pivotal axis is formed; One end of said locking bolt is near an end of said coil, and the said locking bolt other end stretches into lock hole through the hole on the said sky plain bonnet base plate.

5. photoelectric analytical balance according to claim 3 is characterized in that: said comparer mainly is made up of operational amplifier.

6. photoelectric analytical balance according to claim 3 is characterized in that: said on-off circuit mainly is made up of triode, and the collector of said triode connects said coil.

7. photoelectric analytical balance according to claim 5 is characterized in that: also comprise diode, said operational amplifier inverting input connects the positive pole of said diode, the negative pole of the said diode of output termination.