CN106984073B - Fault detection device for nonmetal chain type mud scraper - Google Patents

Fault detection device for nonmetal chain type mud scraper Download PDF

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Publication number
CN106984073B
CN106984073B CN201710339965.7A CN201710339965A CN106984073B CN 106984073 B CN106984073 B CN 106984073B CN 201710339965 A CN201710339965 A CN 201710339965A CN 106984073 B CN106984073 B CN 106984073B
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China
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relay
time
scraper
normally open
detection device
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CN106984073A (en
Inventor
宋超
陈祺伟
杨戌雷
郭志义
孙兴勇
黄晓俊
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Shanghai Chengtou Waste Water Treatment Co Ltd
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Shanghai Chengtou Waste Water Treatment Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D21/00Separation of suspended solid particles from liquids by sedimentation
    • B01D21/30Control equipment
    • B01D21/302Active control mechanisms with external energy, e.g. with solenoid valve
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D21/00Separation of suspended solid particles from liquids by sedimentation
    • B01D21/18Construction of the scrapers or the driving mechanisms for settling tanks
    • B01D21/22Safety mechanisms

Abstract

The invention relates to a fault detection device of a nonmetal chain type mud scraper, which is characterized by comprising induction metal sheets, wherein the induction metal sheets are arranged at two ends of each scraper; the two sides of the wall of the treatment tank are symmetrically provided with two induction proximity switches which are used for inducing the induction metal sheets and sending the induced signals to the control box of the detection device; and the detection device control box judges whether the scraper plate normally advances or not according to signals sent by the electromagnetic induction proximity switches on the two sides of the wall of the treatment tank. The invention has the advantages that: under the condition of not changing the original control protection system, 3 protection functions of twisting, dropping and chain breakage are added, and the original relay contact control system is also adopted, so that the two can be in seamless butt joint.

Description

Fault detection device for nonmetal chain type mud scraper
Technical Field
The invention relates to the field of sewage treatment, in particular to a fault detection device for a nonmetal chain type mud scraper, which can particularly identify the advancing fault state of a scraper of the nonmetal chain type mud scraper.
Background
At present, a sewage treatment plant adopts a relay contact control protection system of a nonmetal chain type mud scraper, and only under the overload condition, a shear pin of the current sewage treatment plant is broken and touches a limit switch to output an alarm to stop the running of the mud scraper. When the scraper of the mud scraper is in a distortion, falling and chain breakage fault state, the originally designed relay contact control protection system cannot stop the mud scraper.
Because the nonmetal chain mud scraper of present application relay contact control protection system does not have the function of detecting the scraper blade trouble condition, so in case the scraper blade appears distortion, drops and when chain breakage, can't in time stop the mud scraper and move, so the scraper blade can not in time stop because the mud scraper all drags to together, and the components such as scraper blade, chain of mud scraper can all be destroyed this moment, and cause the greatly increased of maintenance fund and maintenance cycle.
Disclosure of Invention
The invention aims to provide a fault detection device of a nonmetal chain type mud scraper, which is added with the functions of protecting the twisting, falling and chain breaking faults of a scraper on the basis of the protection function of an originally designed relay contact control system, and can timely find and stop the operation of the mud scraper when the scraper has the conditions of twisting, falling and chain breaking faults. And subsequent maintenance fund and maintenance period are reduced to the maximum extent.
In order to achieve the purpose, the technical scheme of the invention is as follows: a non-metal chain type mud scraper fault detection device is characterized by comprising
The two ends of each scraper are provided with induction metal sheets;
the two sides of the wall of the treatment tank are symmetrically provided with two induction proximity switches which are used for inducing the induction metal sheets and sending the induced signals to the control box of the detection device;
and the detection device control box judges whether the scraper plate normally advances or not according to signals sent by the electromagnetic induction proximity switches on the two sides of the wall of the treatment tank.
According to the preferred embodiment of the invention, the horizontal distance between the induction proximity switch and the nonmetal chain type mud scraper speed reducer is 1-2 m; the clearance between the scraper and the upper part of the scraper is 1-3 cm.
According to a preferred embodiment of the invention, the circuit of the control box of the detection device is as follows:
the first intermediate relay and the first induction proximity switch are connected in series at two ends of the power supply;
the second intermediate relay and the second induction proximity switch are connected in series at two ends of the power supply;
a first normally open switch of the first intermediate relay is connected with a first normally open switch of the first time relay in parallel and then is connected with a time-delay disconnection normally closed contact of the first time relay and a first time relay coil in series at two ends of a power supply;
a first normally open switch of the second intermediate relay is connected with a first normally open switch of the second time relay in parallel and then connected with a time delay disconnection normally closed contact of the second time relay and a second time relay coil in series at two ends of a power supply;
a second normally open switch of the first time relay, a second normally open switch of the second time relay and a coil of the third intermediate relay are connected in series at two ends of the power supply;
one end of a normally open switch of the circuit breaker is connected with one end of a power supply, the other end of the normally open switch of the circuit breaker is respectively connected with one end of a normally closed switch of a third intermediate relay, one end of a normally open switch of a second intermediate relay and one end of the normally open switch of the second intermediate relay, the other end of the normally closed switch of the third intermediate relay is connected to the other end of the power supply through a coil of a third time relay, and the other end of the normally open switch of the second intermediate relay are connected to the other end of the power supply through a coil of a fourth time relay;
and the time delay closed normally open contact of the third time relay and the time delay closed normally open contact of the fourth time relay are connected in parallel on the normally open contact of the thermal relay in the original relay contact protection control system.
According to the preferred embodiment of the invention, the time-delay opening normally-closed switch of the third time relay, the time-delay opening normally-closed switch of the fourth time relay and the signal lamp are connected in series at two ends of the power supply.
The invention has the advantages that: under the condition of not changing the original control protection system, 3 protection functions of twisting, dropping and chain breakage are added, and the original relay contact control system is also adopted, so that the two can be in seamless butt joint. The invention accurately sends out an alarm after being applied, stops the mud scraper in time and transmits a fault signal to the central control room, thereby reducing the large-scale damage of the scraper and the chain. The long-term popularization and application can save the labor cost and improve the working efficiency; the maintenance fund is saved, and the cost is effectively controlled; the maintenance period is reduced.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a circuit diagram of a control box of the monitoring device of the present invention.
The figure includes:
the device comprises a speed reducer 1, a scraper 2, a traction chain 3, a left electromagnetic induction proximity switch 4, a right electromagnetic induction proximity switch 5, a left induction metal sheet 6, a right induction metal sheet 7, a treatment pool 8 and a transmission chain 9.
Detailed Description
The invention is further described below with reference to the figures and examples.
As shown in the figure, a nonmetal chain formula mud scraper fault detection device, nonmetal chain formula mud scraper are provided with two traction chain 3 including handling pond 8 in handling pond 8, set up a plurality of scraper blade 2 between two traction chain 3, traction chain 3 passes through drive chain 9 and is connected with speed reducer 1, by speed reducer 1 drive traction chain 3 to drive link plate 2 and remove in handling pond 8, its characterized in that fault detection device includes that
The induction metal sheets are respectively a left induction metal sheet 6 and a right induction metal sheet 7;
two inductive proximity switches (a left electromagnetic inductive proximity switch 4 and a right electromagnetic inductive proximity switch 5 respectively) are symmetrically arranged on two sides of the wall of the treatment pool 8 and are used for sensing the inductive metal sheet and sending the sensed signals to a control box of the detection device;
and the detection device controls the control box to judge whether the scraper plate normally advances according to signals sent by the electromagnetic induction proximity switches on two sides of the wall of the treatment tank.
The detection device control box judges whether signals sent by the electromagnetic induction proximity switches on two sides of the wall of the treatment tank are received at the same time, if so, the scraper is judged to be normally advanced, and if not, the scraper is judged to be abnormal in advancement; when the electromagnetic induction proximity switches on the two sides of the wall of the treatment tank do not sense the induction metal sheets on the two ends of the scraper or sense the induction metal sheets on the two ends of the scraper all the time within a certain period of time, the scraper is considered to be abnormal in advancing.
According to the preferred embodiment of the invention, the horizontal distance between the left electromagnetic induction proximity switch 4 and the non-metal chain type mud scraper speed reducer 1 is 1-2 m; the gap between the scraper and the upper part of the scraper 2 is 1-3 cm.
When the nonmetal chain type mud scraper speed reducer 1 runs, the scraper blade 2 normally advances, and when the two induction metal sheets advance to the positions under the two electromagnetic proximity switches under the scraper blade 2, a trigger signal is transmitted to the detection device control box, and the running is repeated. The detection device control box simultaneously receives the advancing signals at the two ends of the scraper 2, and the detection device control box judges the conditions to be normal. When the scraper blade 2 is in a twisted, fallen and broken state, the two electromagnetic induction proximity switches do not simultaneously induce the two-end induction metal sheets on the scraper blade 2 or do not induce the two-end induction metal sheets within the set time range, so that the control box of the detection device judges that the fault occurs.
The detection device control box adopts a relay contact control protection system, mainly comprises a time relay, an intermediate relay, a 24V power supply module, a circuit breaker and other components, and has an electrical schematic diagram shown in figure 2, and the detection device control box has the following circuits:
the first intermediate relay KA1 and the left electromagnetic induction proximity switch 4 are connected in series at two ends of a power supply;
the second intermediate relay KA2 and the right electromagnetic induction proximity switch 5 are connected in series at two ends of a power supply;
a first normally open switch KA1-1 of the first intermediate relay is connected with a first normally open switch KT1-1 of the first time relay in parallel and then is connected with a time-delay disconnection normally closed contact of the first time relay KT1 and a coil of the first time relay KT1 in series at two ends of a power supply;
a first normally open switch KA2-1 of the second intermediate relay is connected with a first normally open switch KT2-1 of the second time relay in parallel and then is connected with a time-delay disconnection normally closed contact of the second time relay KT2 and a coil of the second time relay KT2 in series at two ends of a power supply;
the coils of a second normally-open switch KT1-2 of the first time relay, a second normally-open switch KT2-2 of the second time relay and a third intermediate relay KA3 are connected in series at two ends of a power supply;
one end of a normally open switch of the breaker QF is connected with one end of a power supply, the other end of the normally open switch of the breaker QF is respectively connected with one end of a third intermediate relay normally closed switch KA3-1, one end of a first intermediate relay second normally open switch KA1-2 and one end of a second intermediate relay second normally open switch KA2-2, the other end of the third intermediate relay normally closed switch KA3-1 is connected with the other end of the power supply through a coil of a third time relay KT3, the other end of the first intermediate relay second normally open switch KA1-2 and the other end of the second intermediate relay second normally open switch KA2-2 are connected with the other end of the power supply through a coil of a fourth time relay KT 4;
a time-delay off normally closed switch KT3-1 of a third time relay, a time-delay off normally closed switch KT4-1 of a fourth time relay and a signal lamp HG are connected in series at two ends of a power supply;
the time delay closing normally open contact KT3-2 of the third time relay and the time delay closing normally open contact KT4-2 of the fourth time relay are connected in parallel with the normally open contact of the thermal relay in the original relay contact protection control system.
The control principle is as follows:
when the nonmetal chain type mud scraper normally operates, when the scraper blade 2 in the figure 1 advances under two electromagnetic type proximity switches, a trigger signal is transmitted to a detection device control box, the first intermediate relay KA1 and the second intermediate relay KA2 in the figure 2 respectively act once, normally open contacts KA1-1 and KA2-1 of the detection device control box become normally closed contacts, coils of the first time relay KT1 and the second time relay KT2 are electrified, the normally open contacts KT1-1 and KT2-1 of the detection device control box are instantly closed, and self-locking and timing are realized for the first time relay KT1 and the second time relay KT 2. KT1-2 and KT2-2 are normally open contacts which are closed instantly, namely the third intermediate relay KA3 is electrified, the normally closed contact KA3-1 is disconnected, and then the third time relay KT3 is in power-off reset. The breaker QF is closed after the nonmetal chain type mud scraper starts to operate, so that the time relay KT3 starts to time when being electrified, and the timing time is adjustable. When the scraper 2 in fig. 1 passes under two electromagnetic proximity switches each time in normal operation, the intermediate relay KA3 in fig. 2 needs to be electrically triggered once, so that the reset of the time relay KT3 is realized, and the operation is repeated.
The normally closed contacts KT3-1 and KT4-1 which are opened in a delayed manner in fig. 2 are connected in series with a signal lamp HG, namely, the signal lamp is on when in normal operation and is off when in fault, and the signal lamp is arranged to provide a visual observation when in fault alarm.
When the nonmetal chain type mud scraper has a failure of the scraper 2 in fig. 1, two failure conditions are distinguished.
First failure case: when the chain of the traction chain 3 is broken, the transmission chain 9 falls off or the shearing force of the speed reducer 1 is broken, at the moment, the scraper 2 is in a stop state, so the third intermediate relay KA3 in fig. 2 cannot be electrically triggered because the two electromagnetic proximity switches in fig. 1 do not sense the arrival of the induction metal sheet on the scraper 2, namely the third time relay KT3 in fig. 2 triggers an action alarm after the set time arrives because the normally closed contact KA3-1 is not disconnected and reset, the time-delay closing normally open contact KT3-2 in fig. 2 acts, the time-delay closing normally open contact KT3-2 is connected in parallel to the normally open contact of the thermal relay in the original relay contact protection control system, the non-metal chain mud scraper stops operating, and a fault signal is transmitted to the central control room.
When the nonmetal chain mud scraper has the fault conditions of chain breakage and falling, the scraper 2 in the graph 1 just advances under the two electromagnetic induction proximity switches at the moment, the third time relay KT3 in the graph 2 cannot send out a fault alarm, but the coil of the first intermediate relay KA1 or the second intermediate relay KA2 is always powered on at the moment, so that the normally open contact of the KA1-2 or the KA2-2 is closed, the fourth time relay KT4 is powered on to start timing, after the timing is reached, the normally open contact KT4-2 is closed in a delayed mode to act, the KT4-2 is connected to the normally open contact of the thermal relay in the original relay contact protection control system in parallel, the nonmetal chain mud scraper stops running, and a fault signal is transmitted to the central control chamber.
Second failure case: when the scraper 2 in fig. 1 has a twisting fault, in any twisting state, one of the two induction metal sheets on the scraper 2 is triggered first. The time set by the two time relays KT1 and KT2 in fig. 2 is in a sense an alarm point for the blade twist angle in fig. 1. Because when two time relays KT1 and KT2 are not triggered at the same time in fig. 2, the intermediate relay KA3 cannot be powered, and then the power-off reset of the time relay KT3 cannot be realized. And outputting an alarm after the set time is up.
When the electromagnetic proximity switch, the time relay or other components are damaged and the alarm device control system cannot normally work, the circuit breaker QF in the figure 2 is pulled off, so that the operation of the original system cannot be influenced, and the overall operation condition of the mud scraper is ensured.

Claims (2)

1. Nonmetal chain formula mud scraper fault detection device, its characterized in that: the fault detection device comprises induction metal sheets, and the two ends of each scraper are provided with the induction metal sheets; the two sides of the wall of the treatment tank are symmetrically provided with two induction proximity switches which are used for inducing the induction metal sheets and sending the induced signals to the control box of the detection device; the detection device control box judges whether the scraper plate normally advances or not according to signals sent by the electromagnetic induction proximity switches on the two sides of the wall of the treatment tank;
the detection device control box judges whether signals sent by the electromagnetic induction proximity switches on two sides of the wall of the treatment tank are received at the same time, if so, the scraper is judged to be normally advanced, and if not, the scraper is judged to be abnormal in advancement; when the electromagnetic induction proximity switches on the two sides of the wall of the treatment tank do not sense the induction metal sheets on the two ends of the scraper within a certain time, or sense the induction metal sheets on the two ends of the scraper all the time, the scraper is considered to be abnormal in advancing;
the horizontal distance between the induction proximity switch and the nonmetal chain type mud scraper speed reducer is 1-2 m; a gap of 1-3cm is left above the scraper;
the circuit of the detection device control box is as follows: the first intermediate relay and the first induction proximity switch are connected in series at two ends of the power supply; the second intermediate relay and the second induction proximity switch are connected in series at two ends of the power supply; a first normally open switch of the first intermediate relay is connected with a first normally open switch of the first time relay in parallel and then is connected with a time-delay disconnection normally closed contact of the first time relay and a first time relay coil in series at two ends of a power supply; a first normally open switch of the second intermediate relay is connected with a first normally open switch of the second time relay in parallel and then connected with a time delay disconnection normally closed contact of the second time relay and a second time relay coil in series at two ends of a power supply; a second normally open switch of the first time relay, a second normally open switch of the second time relay and a coil of the third intermediate relay are connected in series at two ends of the power supply; one end of a normally open switch of the circuit breaker is connected with one end of a power supply, the other end of the normally open switch of the circuit breaker is respectively connected with one end of a normally closed switch of a third intermediate relay, one end of a normally open switch of a second intermediate relay and one end of a normally open switch of the second intermediate relay, the other end of the normally closed switch of the third intermediate relay is connected to the other end of the power supply through a coil of a third time relay, and the other end of the normally open switch of the second intermediate relay are connected to the other end of the power supply through a coil of a fourth time relay; and the time delay closed normally open contact of the third time relay and the time delay closed normally open contact of the fourth time relay are connected in parallel on the normally open contact of the thermal relay in the original relay contact protection control system.
2. The fault detection device of the non-metal chain type mud scraper of claim 1, wherein: the time-delay disconnection normally closed switch of the third time relay, the time-delay disconnection normally closed switch of the fourth time relay and the signal lamp are connected in series at two ends of the power supply.
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CN112121517B (en) * 2020-09-10 2022-03-22 广西柳州钢铁集团有限公司 Horizontal magnetic filter walking device protection method
CN112915599B (en) * 2021-01-25 2022-04-26 宁波宝新不锈钢有限公司 Monitoring system and monitoring method for chain type transmission mud scraper

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