CN201643804U

CN201643804U - Automatic control device of mud scraping machine

Info

Publication number: CN201643804U
Application number: CN2010200272200U
Authority: CN
Inventors: 李多民; 乔东凯
Original assignee: MAOMING COLLEGE
Current assignee: MAOMING COLLEGE
Priority date: 2010-01-15
Filing date: 2010-01-15
Publication date: 2010-11-24
Anticipated expiration: 2020-01-15

Abstract

The utility model provides an automatic control device of a mud scraping machine, which comprises a power supply control circuit, a voltage-reduction rectifying circuit and a detecting circuit. The power supply control circuit is used for controlling the switching on and off of a power supply of a motor M, and is connected with a frequency changer P used for slowly starting the motor; the voltage-reduction rectifying circuit provides power for the detecting circuit, a detector used for detecting whether the chain of the mud scraping machine is off is arranged in the detecting circuit, and the detector can transmit the detected chain-off signal to the power supply control circuit so as to cut off the power supply of the motor M. The automatic control device can transmit the detected chain-off signal to the power supply control circuit, so as to cut off the power supply of the motor and stop the mud scraping machine, thereby achieving the function of protecting a transmission chain from being snapped. As the frequency changer is adopted, the process of starting the motor to normally running is conducted rather slowly but a large moment is maintained, so as to avoid the breaking of the chain because the mud scraping machine is unable to carry the load.

Description

The mud scraper automaton

Technical field

The utility model relates to a kind of automaton, is a kind of mud scraper automaton that is used for the water-purifying apparatus sedimentation basin specifically.

Background technology

In big-and-middle-sized petrochemical enterprise, production process can produce a large amount of sewage, for recycling or discharging, need carry out purified treatment to sewage, need to use sedimentation basin in the sewage treatment process, sedimentation basin can produce a large amount of sludge settlings at the bottom of the pond, in order to guarantee the normal use of sedimentation basin in the process of disposing of sewage, need clear up the mud that precipitates in the sedimentation basin, present mud scraper is a corollary equipment indispensable in the sewage treatment process.

At the sedimentation basin of some rectangle structures, a mud scraper generally is installed, mud scraper has two coarse pitch driving-chains along sedimentation basin length direction two installed inside, and every driving-chain all has 4 sprocket wheels that are installed in same inboard near four corner locations.Article two, corresponding sprocket wheel is installed on the same axle between the driving-chain, cleaning shoe is installed at interval between two chains, drives the mud that drive sprocket can make two driving-chains drive to be installed in two cleaning shoes on the driving-chain to be removed to precipitate in the sedimentation basins and the floating thing on water surface top layer.

It is slow that the cleaning shoe of common mud scraper shovels random speed, generally is 0.5m/min, like this can be little to the stirring of water body, help the removal of mud.In use, when normally starting for motor, the starting current of motor is very big, be generally seven times of rated current, and its staring torque is subjected to the influence of its power factor (PF) very little, and the load on the cleaning shoe is bigger, and driving-chain often drags not dynamic load and falls chain like this, the accident that finally causes chain rupture is fallen the sprocket wheel place that the easy occurrence positions of chain generally occurs in horizontal level operation the place ahead.And its ruuning situation can't be directly observed in mud scraper work in more abominable mud is heavy.Present mud scraper is owing to lack necessary checkout gear, falls behind the chain mud scraper and continues operation and can drag chain rupture, also had a strong impact on normally carrying out of producing.

Summary of the invention

Thereby can in time cut off the electricity supply automatically and prevent to cause the mud scraper automaton of chain rupture accident because of falling chain when the purpose of this utility model provides the work of a kind of mud scraper because of driving-chain drags not dynamic load.

The mud scraper automaton that the utility model provides, it comprises:

One power control circuit is used to control switching on and off of motor power; Described power control circuit is connected to the frequency converter that is used for slow starter motor;

One step-down rectifying circuit;

One testing circuit provides power supply by step-down rectifying circuit, is useful in the described testing circuit to detect the detector whether mud scraper falls chain, and described detector can pass to power control circuit with the signal that detects chain, thereby cuts off motor power.

Described detector is an inductance approach switch.

Be 12-18 second the start-up time of described frequency converter.

The utility model be owing to can pass to power control circuit with the signal that detects chain, thereby cuts off motor power, and mud scraper is quit work, and so no matter to be that driving wheel or driven pulley take off chain, can both play the effect that the protection driving-chain is not fractureed.

The utility model is owing to adopt frequency converter, and motor is very slow from the process that starts to normal operation, but has kept very big moment, has avoided mud scraper to drag not dynamic load and causes the phenomenon of chain rupture.

Description of drawings

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

Fig. 2 is a circuit diagram of the present utility model.

The specific embodiment

With reference to Fig. 1, the mud scraper automaton that the utility model provides, mud scraper is by two driving-chains 4 along sedimentation basin 1 length direction two installed inside, every driving-chain 4 all has four sprocket wheels 2 that are installed in same inboard near four corner locations, article two, corresponding sprocket wheel 2 is installed on the same axle between the driving-chain 4, cleaning shoe 3 is installed between two chains at interval, being driven by reducing gear by motor M, is near the driving-chain 4 installation and measuring device inductance approach switch SQ sprocket wheel 2 in horizontal level operation the place ahead falling the easy occurrence positions of chain ₁～SQ ₄,

With reference to Fig. 2, this automaton comprises: a power control circuit; One step-down rectifying circuit; One testing circuit.

Power control circuit is by fuse FU ₁, frequency converter P, motor M and coil KM ₁, KM ₂, time-delay relay KT ₁With starting switch SB ₁, shutdown switch SB ₂With compound button S ₁Form.

Step-down rectifying circuit is by transformer L ₁With rectifier bridge D _1～4Form;

Testing circuit is by inductance approach switch SQ ₁～SQ ₄, relay K ₁～K ₄And with inductance approach switch SQ ₁～SQ ₄The indicator lamp HL that cooperates ₁～HL ₄Form.

The parameter of motor M is: model: explosion-proof YB2-100L1-4-2.2, P _N=2.2KW, P=2, U _N=380V, n _N=1420r/min.

Frequency converter P has selected Japanese fuji frequency converter FRN7.5P11S-4CX for use, is 15 seconds (time can change according to system's needs) by setting start-up time.

Inductance approach switch select for use the model of the maximum of distance of reaction under water that Siemens Company produces be 3RG4648-3AN11 near switch, distance of reaction is 35mm, uses the M12 connector, output PNP switching value signal.

One, testing circuit and the motor state of working simultaneously:

Send electricity for whole device, when not taking off chain, power supply is through transformer L ₁Transformation and rectifier bridge D _1～4After the rectification, to the testing circuit power supply, then near switch S Q ₁～SQ ₄Detect corresponding chain and be in normal condition, relay K ₁～K ₄Must be electric, their normally opened contact (K _1～2, K _1～3), (K _2～2, K _2～3), (K _3～2, K _3～3), (K _4～2, K _4～3) spare time closes indicator lamp HL ₁～HL ₄Bright, relay K ₅Energising, its normally opened contact K _5～2Closed.Press starting switch SB ₁, coil KM ₁Energising, its normally opened contact (KM _1～2, KM _1～3) closure, three phase mains is through fuse FU ₁, frequency converter P gives motor M because parameter start-up time of frequency converter P has been set at 15 seconds,, will reach about 1420r/m through 15 second time motor speed so motor M slowly starts.After arriving setting-up time, time-delay relay KT ₁Its normally opened contact of on-delay KT _1～2Closure, coil KM ₂Energising, its normally opened contact (KM _2～2, KM _2～3) closed and self-locking, normally-closed contact KM _2～1Disconnect coil KM ₁With time-delay relay KT ₁Dead electricity, excision relay K M ₁With time-delay relay KT ₁, while coil KM ₂Normally opened contact KM _2～2Closure has been excised frequency converter P, makes device not re-use frequency converter P after starting successfully, thereby has protected frequency converter P.If device is stopped, then pressing SB ₂During button, coil KM ₂Outage is cut off the electricity supply thereby its main contacts disconnects, and motor M is shut down.

As inductance approach switch SQ ₁～SQ ₄In any detects when taking off chain relay K near switch ₁～K ₄Corresponding relays is dead electricity then, such as near switch S Q ₂Detect when taking off chain relay K ₂Dead electricity, its normally opened contact (K _2～2, K _2～3) open relay K ₅With indicator lamp HL ₂The capital dead electricity, relay K ₅Normally opened contact K _5～2Open, cut off the The whole control loop, the motor M outage is shut down, thereby plays the purpose that the protection chain is not fractureed.Can be by adjusting the precision that the amplitude of taking off chain near the position adjustment of switch causes shutdown.

Two, motor is not worked, and monitoring system works independently:

As long as this moment is monitoring system compound button S ₁Press, send electricity to make it in running order to testing circuit, starter motor M just can not see whether normal engaged of chain and sprocket wheel from corresponding indicator lamp.

Three, monitoring system is not worked, and motor can work independently:

This moment compound button S ₁Be in the normal state, at this moment normally opened contact K ₅By short circuit, when pressing start button SB ₁The time motor M start, press the button SB ₂The time motor M stop.Principle is same.

Claims

1. mud scraper automaton is characterized in that it comprises:

One power control circuit is used to control switching on and off of motor M power supply; Described power control circuit is connected to the frequency converter P that is used for slow starter motor;

One step-down rectifying circuit;

One testing circuit provides power supply by step-down rectifying circuit, is useful in the described testing circuit to detect the detector whether mud scraper falls chain, and described detector can pass to power control circuit with the signal that detects chain, thereby cuts off the motor M power supply.

2. mud scraper automaton according to claim 1 is characterized in that described detector is inductance approach switch SQ1～SQ4.

3. mud scraper automaton according to claim 1, be 12-18 second the start-up time that it is characterized in that described frequency converter P.