CN2762900Y

CN2762900Y - Atomatic start/stop device of electromagnetic vibrating screen

Info

Publication number: CN2762900Y
Application number: CN 200420117251
Authority: CN
Inventors: 李松奕; 韩忠; 刘维生
Original assignee: TANGSHAN LAND SKY SCIENCE AND TECHNOLOGY Co Ltd
Current assignee: TANGSHAN LAND SKY SCIENCE AND TECHNOLOGY Co Ltd
Priority date: 2004-12-31
Filing date: 2004-12-31
Publication date: 2006-03-08
Anticipated expiration: 2014-12-31

Abstract

An automatic start/stop device of electromagnetic vibrating screen belongs to the technical field of screening, and it is used to solve the problem of automatic start/stop. Its main circuit includes a drive controlled silicon and an electromagnetic vibration excitor. After being improved, the utility model is added with a control portion, which is composed of a signal acquisition circuit, a switching circuit and a trigger signal generating circuit. The signal acquisition circuit is provided with a sensor, a controlled silicon KG2 and its drive pulse potential transformer B2. The sensor is intercoupling sensor coils L1 and L2. The two coils alternately coil on a non magnetic circular tube, and they are connected to the pipeline of a feed pipe. When there is ferrous powder in the pipeline, the coil L1 sends forth enabling signals because of coupling current, and triggering signals are generated and the circuit starts working, and then drive pulses are sent forth and the controlled silicon starts working. When there is no material on the sieve cloth, the switching circuit is disconnected, the drive pulses stop, and the exciter closes down. Automatic start/stop avoids the sieve cloth idling strong vibration, prolongs the life length of the sieve cloth and reduces the maintenance time.

Description

Hummer screen automatic start-stop device

Technical field

The utility model relates to a kind of solid separation equipment, is to be the start stop apparatus of the vibratory sieve of exciting force with the electromagnetic force specifically, belongs to the screening plant technical field.

Background technology

In industrial circles such as coal, metallurgy, cement, pottery, building materials, screening operation is to use very general operation, and hummer screen is a screening operation equipment commonly used.Vibratory sieve is when work, and raw material is constantly delivered to vibratory sieve by transfer pipeline, transfers out respectively after screening again.When the stop supplies of screening raw material, vibratory sieve should in time be shut down.But the vibratory sieve that uses can not be accomplished this point at present.Vibratory sieve can't be according to whether having material and automatic start-stop on the screen cloth.If can not in time not shut down when the site operation personnel has material on screen cloth, will make screen cloth be in unloaded vibrational state.In this case, the vibration damage of screen cloth is several times of normal screening operation, also can waste a large amount of electric energy simultaneously.Therefore the automatic start-stop device of developing hummer screen is very necessary.

Summary of the invention

Technical problem to be solved in the utility model provide a kind of can be according to the state of material on the screen cloth and the hummer screen automatic start-stop device that starts automatically and shut down.

The technical scheme that addresses the above problem is:

A kind of hummer screen automatic start-stop device, its main circuit comprises an electromagnetic exciter that drives controllable silicon and be electrically connected by the driving controllable silicon, after the improvement, set up the control section of electromagnetic exciter, described control section is by signal acquisition circuit, on-off circuit, triggering signal produces circuit 10 and forms, described signal acquisition circuit is provided with sensor, controllable silicon KG2 and trigger impulse transformer B2 thereof, described sensor is the sensor coil L1 that intercouples, L2, two coil spacings are wound on the non magnetic pipe, pipe is connected in the pipeline of feed pipe 4, coil L2 is serially connected in the major loop of controllable silicon KG2, coil L1 connects the regulator rectifier circuit input of on-off circuit 8, on-off circuit 8 is by regulator rectifier circuit ZW, triode T1, relay J 1 is formed, the output control triode T1 of regulator rectifier circuit ZW, the latter's collector load is a relay J 2, grounded emitter, and the normally opened contact output triggering signal of relay J 2 produces the signal of opening of circuit.

Above-mentioned hummer screen automatic start-stop device, described triggering signal produces circuit 10 and comprises regulator potentiometer W4, zero cross detection circuit, single-chip microcomputer IC2 and amplifying circuit chip IC 3, wherein, single-chip microcomputer IC2 adopts 16F74, the cursor slide of regulator potentiometer W4 is terminated at the 5th pin of single-chip microcomputer IC2, described zero cross detection circuit is by amplifier ic chip 1, diode D1, D2, resistance R 1, R2, R3, R4 forms, the input of zero cross detection circuit is connected to AC power, diode D1 is a commutation diode, resistance R 1 is its load resistance, resistance R 2 one is terminated at the negative electrode of diode D1, the other end is connected to the 3rd pin of amplifier ic chip 1, amplifier ic chip 1 is connected into voltage comparator, resistance R 3, R4 serial connection back constitutes the reference potential circuit of voltage comparator negative phase end, its output is connected to the 40th pin of single-chip microcomputer IC2, the output port of single-chip microcomputer IC2 connects the input of amplifying circuit chip IC 3, amplifying circuit chip IC 3 adopts 273, the 5th pin in its output is connected to the former limit of pulse transformer that drives controllable silicon KG1, the pulse transformer secondary is connected to and drives the silicon controlled trigger electrode, the 7th pin is connected to the former limit of pulse transformer of signal acquisition circuit controllable silicon KG2, the pulse transformer secondary is connected to the trigger electrode of controllable silicon KG2, and the normally opened contact of relay J 2 connects the 18th pin and the power supply VCC of chip IC2 respectively.

Above-mentioned hummer screen automatic start-stop device inserts opto-coupler chip GO between the base stage of the output of described regulator rectifier circuit ZW and triode T1.

Adopt the hummer screen automatic start-stop device of this structure, in the screen cloth transfer pipeline during the ferromagnetic class material of circulation, cell winding L1 produces couple current because of the iron powder in the feed pipe, on-off circuit sends enabling signal, making start pulse signal produce circuit starts working, send the trigger impulse sequence, controllable silicon KG1 is started working; When not having material on the screen cloth; there is not signal to send among the cell winding L1; on-off circuit disconnects; trigger impulse stops to produce, and electromagnetic exciter is shut down, and this has just realized the situation automatic start-stop of hummer screen according to material in the screen cloth; thereby avoided the screen cloth zero load to shake by force; prolong the service life of screen cloth, reduced maintenance time, reduced operating cost.

Description of drawings

Fig. 1 is a general assembly structural representation of the present utility model;

Fig. 2 is an electrical schematic diagram of the present utility model.

Each label is as follows among the figure: screen(ing) machine 1, supporting seat 2, frame 3, feed pipe 4, electromagnetic exciter 5, hummer screen automatic start-stop device 6, signal acquisition circuit 7, on-off circuit 8, driving controllable silicon 9, triggering signal produce circuit 10.

The specific embodiment

Typical electric and magnetic oscillation sieve structure as seen from Figure 1, it comprises parts such as screen(ing) machine 1, supporting seat 2, frame 3, feed pipe 4, electromagnetic exciter 5, hummer screen automatic start-stop device 6 is installed on the frame 3, and its cell winding L1, L2 are wound on the feed pipe 4.

Fig. 2 is the electrical schematic diagram of an embodiment of hummer screen automatic start-stop device.The model of part of devices is among the figure: amplifier ic chip 1 is that 16F74, amplifying circuit chip IC 3 are 273 for TLC27, single-chip microcomputer IC2.

See that from figure on-off circuit 8 is core circuits of The whole control part, it comprises regulator potentiometer W4, zero cross detection circuit, single-chip microcomputer IC2, amplifying circuit chip IC 3.The cursor slide end of regulator potentiometer W4 is used to regulate the current potential of single-chip microcomputer IC2 the 5th pin, adjusting the silicon controlled angle of flow, and and then adjusts the amplitude of electromagnetic exciter.Zero cross detection circuit is made up of integrated circuit die I C1, diode D1, D2, resistance R 1, R2, R3, R4, and zero cross detection circuit is to the 40th pin output detection signal of single-chip microcomputer IC2.15,19,20 pin of single-chip microcomputer IC2 connect the input of amplifying circuit chip IC 3, and 6,7 pin of amplifying circuit chip IC 3 drive controllable silicon KG1 and KG2 respectively.The conducting of the output signal of on-off circuit 8 control triode T1 with end, thereby engage relay J1 provides high and low level to 18 pin of single-chip microcomputer IC2.

As can also be seen from Figure, the former limit of pulse transformer B1, B2 also connects diode, in case its insulation is broken down by high-voltage.

The circuit working process is as follows:

After the opening power, adjust potentiometer W4 and make the 5th pin of single-chip microcomputer IC2 reach required voltage, zero cross detection circuit provides a detection signal for the 40th pin of single-chip microcomputer IC2 simultaneously, and whether single-chip microcomputer IC2 sends triggering signal according to above-mentioned voltage and detection signal decision.As send triggering signal, then this signal is transported to amplifying circuit chip IC 3, through be transported to the former limit of the pulse transformer B2 of signal acquisition circuit after amplifying by the 7th pin of amplifying circuit chip IC 3, after isolating, pulse transformer B2 outputs to the controllable silicon KG2 control utmost point, trigger controllable silicon KG2 conducting, in sensor coil L2, form pulse current.Because sensor coil L2 is on feed pipe, when having ferromagnetic material to pass through in the feed pipe, another produces induced current around the sensor coil L1 on the feed pipe, and this electric current is controlled the conducting of triode T1 and ended behind rectifying and voltage-stabilizing, opto-coupler chip GO, thus the coil of engage relay J1.When the normally open contact J1-1 of relay J 1 closure, 18 pin of single-chip microcomputer IC2 obtain a high level, at this moment output 15,19,20 pin of single-chip microcomputer IC2 are the output opening state, 6 pin of amplifying circuit chip IC 3 send triggering signal to pulse transformer B1, after transformer isolation, output to the trigger electrode of controllable silicon KG1, trigger controllable silicon KG1 conducting, electromagnetic exciter must be established the beginning screening operation by cable.When not having material in the feed pipe, induced current among the cell winding L1 reduces, triode T1 ends, relay J 1 coil losing electricity, normally open contact J1-1 disconnects, and 18 pin of single-chip microcomputer IC2 are low level, and single-chip microcomputer IC2 stops to send start pulse signal, controllable silicon KG1 ends, and electromagnetic exciter quits work.

Claims

1. hummer screen automatic start-stop device, its main circuit comprises an electromagnetic exciter that drives controllable silicon and be electrically connected by the driving controllable silicon, it is characterized in that, set up the control section of electromagnetic exciter, described control section is by signal acquisition circuit [7], on-off circuit [8], triggering signal produces circuit [10] and forms, described signal acquisition circuit is provided with sensor, controllable silicon KG2 and trigger impulse transformer B2 thereof, described sensor is the sensor coil L1 that intercouples, L2, two coil spacings are wound on the non magnetic pipe, pipe is connected in the pipeline of feed pipe [4], coil L2 is serially connected in the major loop of controllable silicon KG2, coil L1 connects the regulator rectifier circuit input of on-off circuit [8], on-off circuit [8] is by regulator rectifier circuit ZW, triode T1, relay J 1 is formed, the output control triode T1 of regulator rectifier circuit ZW, the latter's collector load is a relay J 2, grounded emitter, the normally opened contact output triggering signal of relay J 2 produces the signal of opening of circuit.

2. hummer screen automatic start-stop device according to claim 1, it is characterized in that, described triggering signal produces circuit [10] and comprises regulator potentiometer W4, zero cross detection circuit, single-chip microcomputer IC2 and amplifying circuit chip IC 3, wherein, single-chip microcomputer IC2 adopts 16F74, the cursor slide of regulator potentiometer W4 is terminated at the 5th pin of single-chip microcomputer IC2, described zero cross detection circuit is by amplifier ic chip 1, diode D1, D2, resistance R 1, R2, R3, R4 forms, the input of zero cross detection circuit is connected to AC power, diode D1 is a commutation diode, resistance R 1 is its load resistance, resistance R 2 one is terminated at the negative electrode of diode D1, the other end is connected to the 3rd pin of amplifier ic chip 1, amplifier ic chip 1 is connected into voltage comparator, resistance R 3, R4 serial connection back constitutes the reference potential circuit of voltage comparator negative phase end, its output is connected to the 40th pin of single-chip microcomputer IC2, the output port of single-chip microcomputer IC2 connects the input of amplifying circuit chip IC 3, amplifying circuit chip IC 3 adopts 273, the 5th pin in its output is connected to the former limit of pulse transformer that drives controllable silicon KG1, the pulse transformer secondary is connected to and drives the silicon controlled trigger electrode, the 7th pin is connected to the former limit of pulse transformer of signal acquisition circuit controllable silicon KG2, the pulse transformer secondary is connected to the trigger electrode of controllable silicon KG2, and the normally opened contact of relay J 2 connects the 18th pin and the power supply VCC of chip IC2 respectively.

3. hummer screen automatic start-stop device according to claim 1 and 2 is characterized in that, inserts opto-coupler chip GO between the base stage of the output of described regulator rectifier circuit ZW and triode T1.