CN86202754U

CN86202754U - Microcomputer-based fast-measuring magnetic disk electronic balance

Info

Publication number: CN86202754U
Application number: CN 86202754
Authority: CN
Inventors: 张青云
Original assignee: BRANCH FACTORY NO 4 WUHAN HEAVY-DUTY MACHINE-TOOL FACTORY
Current assignee: BRANCH FACTORY NO 4 WUHAN HEAVY-DUTY MACHINE-TOOL FACTORY
Priority date: 1986-05-02
Filing date: 1986-05-02
Publication date: 1987-05-20

Abstract

The utility model discloses a microcomputer-based fast-measuring magnetic disk electronic balance which belongs to weighing equipment for the cupola automatic proportioning. The present magnetic disk electronic balance has low material catching voltage, so the magnetic disk electronic balance can not catch the furnace material which is in given weight and does downward motion, and poor precision and long time operation can be achieved. When the utility model is used, a magnetic disk circuit is added with a high voltage generating circuit, a microcomputer is used to form a control system, and the short time high voltage is used to catch the material and is controlled by the microcomputer; so the furnace material which is in given weight and does downward motion can be duly and accurately caught; thereby, the high precision can be realized, the once successful metering can be realized, the fast measure can be achieved, and the error is under 5%.

Description

Microcomputer-based fast-measuring magnetic disk electronic balance

The utility model relates to a kind of cupola furnace automatic proportioning weighing-appliance.

The cupola furnace automatic proportioning generally is to adopt disk electronic scales weighing pig, foundry return, furnace charges such as steel scrap in the batching driving at present.The disk electronic scales is by magnechuck, tension-compression sensor, compositions such as controller.The method of work that the disk electronic scales adopts is: a suction, and repeat blowing, material grasping then, weigh, repeatedly compare, progressively near the method for specified rate.There are some shortcomings in this kind disk electronic scales: number of comparisons is many, and batching is slow, and material grasping voltage is low, generally is no more than 400V.Because disk is big inductance element, electric current can not suddenly change.The time that electric current rises to ratings reduces with alive increase.When material grasping voltage was low, the disk electric current can not in time rise, and material grasping magnetic field can not in time be set up, and determining charging weight when tension-compression sensor and controller is in set-point the time, has some furnace charges to be in the state of firm whereabouts.Set up slowly because of material grasping magnetic field, make disk can not in time catch the furnace charge that in set-point, is in falling state again.After material grasping magnetic field was set up, the former that part of furnace charge that is in the whereabouts in the set-point again that is defined in had fallen for a long time.So weighing precision is poor, can not satisfy production requirement.

The purpose of this utility model is the shortcoming that is to overcome above-mentioned disk electronic scales, makes its weighing number of times few, and the precision height can be measured fast.

Way of the present utility model is to increase a high-pressure generating circuit in the disk circuit, adopts the microcomputer single card microcomputer, the A/D circuit, and printers etc. constitute the control system of electronic scales.The signal of sending when pulling force sensor confirms that through microcomputer charging weight is (wherein having the part furnace charge to be in firm falling state) in set-point the time, the system controlled by computer high-pressure generating circuit is supplied with high direct voltage to disk at the utmost point in the short time, shorten the time that disk material grasping electric current rises, increase the instantaneous suction of disk, just disk can in time promptly be caught the furnace charge in the set-point, after the high pressure cut-off, continue power supply by the former power supply main circuit of disk.High-pressure generating circuit is by bidirectional triode thyristor (or one-way SCR inverse parallel), step-up transformer, compositions such as high-voltage rectifying bridge.The controllable silicon of high-pressure generating circuit is adjusted in 0.1～0.5 second by microcomputer actuation time, and the high pressure of output is between 600～2000 volts, and they should change according to the disk specification.

The utility model has the advantages that: material grasping has adopted high voltage, shortened the time that the disk electric current rises greatly, can guarantee that disk sets up material grasping magnetic field and catch by microcomputer and confirm the furnace charge that is in the whereabouts again in specified rate in the extremely short time, can a weighing success, so weighing precision height, time is short, and error also can be measured when the driving operation fast below 5%.Shortcoming of the present utility model is the higher requirement of insulation proposition to magnechuck.

Below in conjunction with description of drawings embodiment.

Fig. 1 measures the overall block-diagram of disk electronic scales fast for microcomputerization.1---pulling force sensor BLR, 2---prime amplifier K, 3---analog-digital conversion a/d, 4---microcomputer μ P, 5---disk power supply resistance circuit controllable silicon SCR ₁, 6---the high-pressure generating circuit controllable silicon SCR ₂

Fig. 2 measures the disk circuit diagram of disk electronic scales fast for microcomputerization.It is made up of main circuit and high-pressure generating circuit.Main circuit is by single-phase semi-controlling bridge 3CT, 4CT, 1CZ, 2CZ, high pressure isolating diode 3CZ, forward, reverse probe of contactor XC, FC, current limliting

electricity limit

16R, 17R, 18R, fly-wheel diode 6CZ, compositions such as magnechuck M.High-pressure generating circuit is by inverse parallel one-way SCR (or bidirectional triode thyristor) 1CT, 2CT, step-up transformer 1TB, compositions such as high-voltage rectifying bridge 8CZ, 10CZ, 12CZ, 14CZ.Single-phase semi-controlling bridge 3CT, the 4CT of main circuit, 1CZ, 2CZ trigger rectification under microcomputer μ P control, to disk M power supply, export 220 volts of direct currents by XC, and disk M is filled furnace charge.Controllable silicon half control bridge progressively reduces the end pressure then, makes disk M blowing.The signal of sending as sensor BLR is through microcomputer μ P, and A/D waits when confirming to reach set-point, microcomputer μ P control triggers the 1CT of high-pressure generating circuit, and 2CT work is by stepup transformer 1TB, high-voltage rectifying bridge 8CZ, 10CZ, 12CZ, 14CZ rectification are to disk M output high pressure.Make disk M set up material grasping magnetic field rapidly, catch as quick as thought in the set-point scope, be in the furnace charge of whereabouts again.The action of high voltage time is adjusted in 0.1～0.5 second by microcomputer, and output DC is pressed between 600～2000 volts.They are with different change of specification of disk M.After the high pressure effect finishes, continue to supply with normal working voltage, hold furnace charge by single-phase semi-controlling bridge.So that send in the cupola furnace hopper.

Diode 3CZ has been the effect of isolated DC high pressure, with the protection single-phase semi-controlling bridge.Withstand voltage need reach 3～5 times of high direct voltage.Diode 6CZ is the fly-wheel diode of disk M, can reliably working under inductive load to guarantee single-phase semi-controlling bridge.Withstand voltage need reach 3～5 times of high direct voltage value.

Claims

1, to measure the disk electronic scales fast be by disk M to a kind of microcomputerization that is used for the cupola furnace automatic proportioning, pulling force sensor BLR, control system is formed, it is characterized in that in the circuit of disk M high-pressure generating circuit being housed, control system is by microcomputer uP, analog-digital conversion a/d, printer and other electrical equipment constitute.

2,, it is characterized in that high-pressure generating circuit is by one-way SCR 1CT, 2CT inverse parallel (or bidirectional triode thyristor), the transformation of boosting 1TB, compositions such as high-voltage rectifying bridge 8CE, 10CZ, 12CZ, 14CZ according to the disk electronic scales of claim 1.

3, according to the disk electronic scales of claim 1 or 2, it is characterized in that high-pressure generating circuit adjusted at 0.1～0.5 second by microcomputer action time, the high direct voltage of output is between 600～2000 volts, they change with disk specification size.

4, according to the disk electronic scales of claim 1 or 2, it is characterized in that between the single-phase half-controlled silicon bridge positive terminal and high-voltage rectifying bridge positive terminal in the disk circuit, high pressure isolating diode 3CZ is housed, its withstand voltage should be 3～5 times of high-voltage value, and the withstand voltage of the fly-wheel diode 6CZ in the disk circuit should be 3～5 times of high-voltage value.

5, according to the disk electronic scales of claim 3, it is characterized in that between the single-phase half-controlled silicon bridge positive terminal and high-voltage rectifying bridge positive terminal in the disk circuit, high pressure isolating diode 3CZ is housed, its withstand voltage should be 3～5 times of high-voltage value, and the withstand voltage of the fly-wheel diode 6CZ in the disk circuit should be 3～5 times of high-voltage value.