阅读说明：本技术 被动端防停转电路、由其组成的被动端防停转系统及方法 (Passive end anti-stall circuit, passive end anti-stall system composed of same and passive end anti-stall method ) 是由 杨前海 邵彩梅 孙娅静 冯鹏刚 郭绍永 李劲 曹建军 单永平 强志锐 于 2020-04-13 设计创作，主要内容包括：本发明公开了一种被动端防停转电路、由其组成的被动端防停转系统及方法。所述被动端防停转电路包括电机主电路和控制电路；所述被动端防停转系统包括与被动端同步转动的基体和被动端防停转电路,所述基体设置有缺口,所述缺口的角度范围为150°～170°,所述接近开关SQ1、接近开关SQ2呈180°分布安装于基体两侧；所述被动端防停转方法应用于被动端防停转系统。本发明以有限的成本,可极大的降低设备因被动端停转引发重大故障的概率。(The invention discloses a passive-end anti-stall circuit, a passive-end anti-stall system composed of the same and a passive-end anti-stall method. The passive end anti-stalling circuit comprises a motor main circuit and a control circuit; the passive end anti-stalling system comprises a base body and a passive end anti-stalling circuit, wherein the base body and the passive end anti-stalling circuit synchronously rotate with the passive end, the base body is provided with a notch, the angle range of the notch is 150-170 degrees, and the proximity switches SQ1 and SQ2 are arranged on two sides of the base body in a 180-degree distribution manner; the passive end anti-stalling method is applied to a passive end anti-stalling system. The invention can greatly reduce the probability of major faults caused by the stop of the passive end of the equipment with limited cost.)

1. Passive end anti-stall circuit, including motor main circuit and control circuit, the motor main circuit includes motor M and the thermal relay FR, contactor KM main contact normal open point, circuit breaker QF who is connected with it, its characterized in that: the control circuit comprises a start-stop circuit and a stall protection circuit, the start-stop circuit comprises a fuse FU, a stop button SB1, an intermediate relay KA3 normally-closed point, a start button SB2, a thermal relay FR normally-closed point, a contactor KM coil, a contactor KM auxiliary contact normally-open point connected with the start button SB2 in parallel, the stalling protection circuit comprises an intermediate relay KA1, an intermediate relay KA2, an intermediate relay KA3 coil, a time delay relay KT1, a time delay relay KT2, a proximity switch SQ1 and a proximity switch SQ2, the time delay relay KT1 and the time delay relay KT2 are respectively connected in series with the normally-open point of the intermediate relay KA1 and the normally-open point of the intermediate relay KA2 and then connected in parallel, the proximity switch SQ1 and the proximity switch SQ2 are respectively connected with the coil of the intermediate relay KA1 and the coil of the intermediate relay KA2 and then connected in parallel, the time delay relay KT1 time delay closing point, time delay relay KT2 time delay closing point after parallelly connected with the auxiliary relay KA3 coil series connection.

2. The passive-end anti-stall circuit of claim 1, wherein: the time delay relay KT1 time delay closing point, time delay relay KT2 time delay closing point connect in parallel the back with the auxiliary relay KA3 normally open the point and connect in parallel.

3. The passive-end anti-stall circuit of claim 2, wherein: and a delay closing point of the delay relay KT1, a delay closing point of the delay relay KT2 and a normally open point of the intermediate relay KA3 are connected in parallel and then are connected in series with a stop-turn reset button SB 3.

4. The passive-end anti-stall circuit of claim 1, wherein: and a coil of the intermediate relay KA3 is connected in parallel with a stalling fault warning lamp H2.

5. The passive-end anti-stall circuit of claim 1, wherein: the delay relay KT2 is connected in parallel with an operation/rotation speed indicator lamp H1.

6. Passive end anti-stall system, its characterized in that: the system comprises a base body and the passive end anti-stalling circuit, wherein the base body rotates synchronously with the passive end, the passive end anti-stalling circuit is arranged on any one of claims 1-5, the base body is provided with a notch, the angle range of the notch is 150-170 degrees, and the proximity switches SQ1 and SQ2 are arranged on two sides of the base body in a 180-degree distribution mode.

7. The passive end anti-stall system of claim 6, wherein: the base body is an iron ring with a notch, and the diameter of the iron ring is not less than 50 mm.

8. The passive end anti-stall system of claim 6, wherein: the rotating speed of the passive end is not higher than 2 r/min.

9. The passive end anti-stall system of claim 8, wherein: when the rotating speed of the driven end is higher than 2 revolutions per minute, a transmission speed reducing structure is arranged between the driven end and the base body.

10. The method for preventing the passive end from stalling is characterized in that: the method is applied to the passive end anti-stalling system of any one of claims 6-9, and comprises the following steps:

step one, installing a passive end anti-stall system;

setting stall delay time of the delay relay KT1 and the delay relay KT 2;

and step three, detecting the substrate through a proximity switch SQ1 and a proximity switch SQ 2:

when the passive end of the equipment normally operates, the proximity switches SQ1 and SQ2 periodically detect a substrate, and periodically electrify/lose the intermediate relay KA1 coil and the intermediate relay KA2 coil, periodically close/open the intermediate relay KA1 normally open point and the intermediate relay KA2 normally open point, periodically supply/cut off power to/from the time delay relay KT1 and the time delay relay KT2, at the moment, the operation/rotation speed indicator lamp H1 periodically flickers, and when the time delay relay KT1 and the time delay relay KT2 are cut off power, the stopping delay time is reset;

when the passive end of the equipment stops rotating, the substrate is still, one of the proximity switches SQ1 and SQ2 continuously detects the substrate, correspondingly, one of the coil of the intermediate relay KA1 and the coil of the intermediate relay KA2 is continuously electrified, and the other one of the normally open point of the intermediate relay KA1 and the normally open point of the intermediate relay KA2 is continuously closed, when one of the time delay relay KT1 and the time delay relay KT2 is powered continuously and the continuous power supply time of the time delay relay KT1 and the time delay relay KT2 reaches the stalling time delay, the normally closed point of the intermediate relay KA3 is closed corresponding to the time delay closed point of the time delay relay, the coil of the intermediate relay KA3 is electrified, the normally open point of the intermediate relay KA3 is closed to form the power-on state of the self-locking maintaining coil, the normally closed point of the intermediate relay KA3 is opened to enable the coil of the contactor KM to be powered off, the motor is stopped, and the stop fault alarm lamp H2 is continuously lightened;

and step four, when the equipment passive end stops to cause the intermediate relay KA3 to trigger the stop protection action, the passive end anti-stop system can be reset only by pressing the stop reset button SB 3.

Technical Field

The invention relates to the field of operation monitoring of transmission equipment, in particular to a passive-end anti-stall circuit, a passive-end anti-stall system composed of the passive-end anti-stall circuit and a passive-end anti-stall method.

Background

The transmission device comprises a driving wheel, a driven wheel and a transmission belt, wherein the driven wheel can also be called a tail wheel or a driven end. In the use, the motor is connected to the action wheel, and the motor drives the action wheel and rotates, and the conveyer belt setting is on action wheel and follow driving wheel, and the rotation of action wheel drives the conveyer belt motion to drive from the driving wheel rotation.

In various mechanical production scenarios, the above-mentioned transmission devices need to be applied. The failure of the driving wheel or motor is easily detected, but the tail wheel is usually too far away from the driving wheel to be easily detected. For places such as production workshops and the like, if the faults cannot be found in time, accidents are easily caused.

For example, because the elevator belt skids and causes belt fracture, scrape trigger owner chain fracture and cause the aircraft nose winding etc. these lead to passive end not rotatory because transmission structure is invalid, and then lead to the phenomenon of bigger trouble very common in the feed factory.

For another example, when the tail wheel is stopped, if the tail wheel is not found and stopped in time, the tail wheel is suddenly stopped, which may adversely affect the supply of raw materials and the quality of products. The downtime, as well as the labor and material costs of maintenance personnel, is undoubtedly a significant loss for a business with a busy production.

To achieve the anti-stall detection of the passive end of the transmission, the following related documents are disclosed in the prior art.

Chinese utility model patent with publication number CN202784730U discloses a belt slip detection alarm device. An iron plate with a certain size is fixedly arranged on a tail pulley of the belt, a detection device is arranged on a tail pulley base, the detection device comprises a proximity switch, a time relay and the like, and the installation distance between the iron plate and the detection device is 10-20 mm; the detection device is connected with the alarm and is electrified. When the belt runs, the belt running point is closed, the timing unit runs in a timing state, the iron plate on the belt tail wheel rotates along with the belt tail wheel, the iron plate is close to the proximity switch once every circle of rotation, the proximity switch is switched on once under the influence of the iron plate, and the time relay can reset and automatically reset. When the belt slips, the belt can not drive the tail wheel to rotate, the iron plate can not influence the proximity switch, the time relay can not reset within the set time, and when the set time is reached, the time relay outputs a signal and simultaneously sends an audible and visual alarm signal and controls the belt to stop running.

The Chinese invention application with the publication number of CN106679974A discloses a transmission equipment tail wheel stall alarm system, which comprises a circular plate, a proximity switch, a P L C and an alarm, wherein two notches are arranged on the periphery of the plate surface of the circular plate, the two notches are oppositely arranged along the same diameter of the plate surface, the circular plate is connected with a transmission equipment tail wheel in a shaft connection mode, the proximity switch is arranged on the periphery of the circular plate, the switching value signal and the count of the proximity switch are collected through the P L C, if the time interval between the current switching value signal and the previous switching value signal is larger than or equal to the preset interval, the current switching value signal is counted again, the count result corresponding to the previous switching value signal is used as detection result data, and the alarm signal is output to the alarm under the condition that the detection result data is larger than the preset value.

Chinese utility model patent with publication number CN203635139U discloses a stirring shaft type stalling alarm device. The device includes proximity switch, auxiliary relay, time relay and alarm, and proximity switch is connected with auxiliary relay, and auxiliary relay is connected with time relay's one end respectively, and time relay's the other end is connected with the alarm.

For the equipment with the electric control system integrated in the central control P L C control cabinet, the passive end anti-stall function can be integrated in the control program, which is easy to realize and has little difficulty, for the independent equipment without the P L C control system, if the passive end anti-stall function is to be realized, a set of P L C control system needs to be configured independently, and the manufacturing cost is high.

The application aims to solve the problem of the passive end anti-stall control of low-speed single equipment (such as bucket elevator, scraper conveyor, belt conveyor and other equipment with the passive end rotating speed lower than 2 revolutions per second) through the lowest cost.

Disclosure of Invention

In view of the above problems, the present invention provides a passive-end stall prevention circuit, a passive-end stall prevention system composed of the same, and a method thereof, which can greatly reduce the probability of major faults caused by the stall of the passive end of equipment with limited cost.

The technical scheme adopted by the invention for solving the technical problems is as follows:

the passive end anti-stalling circuit comprises a motor main circuit and a control circuit, wherein the motor main circuit comprises a motor M, a thermal relay FR connected with the motor M, a contactor KM main contact normally-open point and a breaker QF, the control circuit comprises a start-stop circuit and a stalling protection circuit, the start-stop circuit comprises a fuse FU, a stop button SB1, an intermediate relay KA3 normally-closed point, a start button SB2, a thermal relay FR normally-closed point, a contactor KM coil and a contactor KM auxiliary contact normally-open point connected with the start button SB2 in parallel, the stalling protection circuit comprises an intermediate relay KA1, an intermediate relay KA2, an intermediate relay KA3 coil, a time-delay relay KT1, a time-delay relay KT2, a proximity switch SQ1 and a proximity switch 2, the time-delay KT relay KA1 and the time-delay relay KT2 are connected with the intermediate relay KA1 normally-open point and the intermediate relay 2 normally-open point in series and then connected in parallel, proximity switch SQ1, proximity switch SQ2 link to each other the back parallelly connected with auxiliary relay KA1 coil, auxiliary relay KA2 coil respectively, time delay relay KT1 time delay closing point, time delay relay KT2 time delay closing point after parallelly connected with auxiliary relay KA3 coil series connection.

Furthermore, the time delay relay KT1 time delay closing point, time delay relay KT2 time delay closing point after connecting in parallel with the intermediate relay KA3 normally open the point and connect in parallel.

Furthermore, a delay closing point of the delay relay KT1, a delay closing point of the delay relay KT2 and a normally open point of the intermediate relay KA3 are connected in parallel and then are connected in series with a stalling reset button SB 3.

Further, a stalling fault warning lamp H2 is connected in parallel with the coil of the intermediate relay KA 3.

Further, the delay relay KT2 is connected in parallel with a running/rotating speed indicator lamp H1.

The passive end anti-stalling system comprises a base body and any one of the passive end anti-stalling circuits, wherein the base body synchronously rotates with a passive end, the base body is provided with a notch, the angle range of the notch is 150-170 degrees, and the proximity switches SQ1 and SQ2 are arranged on two sides of the base body in a 180-degree distribution mode.

Further, the base body is an iron ring with a notch, and the diameter of the iron ring is not less than 50 mm.

Further, the rotating speed of the driven end is not higher than 2 revolutions per minute.

Further, when the rotating speed of the driven end is higher than 2 revolutions per minute, a transmission speed reducing structure is arranged between the driven end and the base body.

The passive end anti-stall method is applied to the passive end anti-stall system, and comprises the following steps:

step one, installing a passive end anti-stall system;

setting stall delay time of the delay relay KT1 and the delay relay KT 2;

and step three, detecting the substrate through a proximity switch SQ1 and a proximity switch SQ 2:

when the passive end of the equipment normally operates, the proximity switches SQ1 and SQ2 periodically detect a substrate, and periodically electrify/lose the intermediate relay KA1 coil and the intermediate relay KA2 coil, periodically close/open the intermediate relay KA1 normally open point and the intermediate relay KA2 normally open point, periodically supply/cut off power to/from the time delay relay KT1 and the time delay relay KT2, at the moment, the operation/rotation speed indicator lamp H1 periodically flickers, and when the time delay relay KT1 and the time delay relay KT2 are cut off power, the stopping delay time is reset;

when the passive end of the equipment stops rotating, the substrate is still, one of the proximity switches SQ1 and SQ2 continuously detects the substrate, correspondingly, one of the coil of the intermediate relay KA1 and the coil of the intermediate relay KA2 is continuously electrified, and the other one of the normally open point of the intermediate relay KA1 and the normally open point of the intermediate relay KA2 is continuously closed, when one of the time delay relay KT1 and the time delay relay KT2 is powered continuously and the continuous power supply time of the time delay relay KT1 and the time delay relay KT2 reaches the stalling time delay, the normally closed point of the intermediate relay KA3 is closed corresponding to the time delay closed point of the time delay relay, the coil of the intermediate relay KA3 is electrified, the normally open point of the intermediate relay KA3 is closed to form the power-on state of the self-locking maintaining coil, the normally closed point of the intermediate relay KA3 is opened to enable the coil of the contactor KM to be powered off, the motor is stopped, and the stop fault alarm lamp H2 is continuously lightened;

and step four, when the equipment passive end stops to cause the intermediate relay KA3 to trigger the stop protection action, the passive end anti-stop system can be reset only by pressing the stop reset button SB 3.

The invention has the following beneficial effects:

the invention can greatly reduce the probability of major faults caused by the halt of the passive end of the equipment, and the cost is as follows: the control elements which are added for implementing the invention except the original control elements of the main circuit of the motor are as follows: 2 proximity switches, 2 time delay relays, 3 intermediate relays, 2 indicator lights, necessary cables, an electric box and installation cost, and the total cost can be controlled within 1000 yuan.

When the passive end of the equipment stops rotating, the iron ring is still, the iron ring with the gap angle smaller than 180 degrees and the proximity switches distributed at 180 degrees ensure that at least 1 proximity switch is positioned at the entity position of the iron ring, the power is supplied to one of the time delay relay KT1 and the time delay relay KT2 continuously, when the duration reaches the set stop delay time (flexibly set/adjusted according to the stop time bearable by the equipment), the action is triggered, the time delay closing point corresponding to the time delay relay is closed, the coil of the intermediate relay KA3 is electrified, the intermediate relay KA3 normally open point is closed to form self-locking, the intermediate relay KA3 normally closed point is opened to enable the coil of the contactor KM to lose the power, the motor stops rotating, and major faults caused by the stop of the passive end of the equipment are prevented.

When the equipment normally operates, the gap iron ring periodically triggers a proximity switch SQ2, and the proximity switch SQ2 periodically supplies power to an operation/rotating speed indicator lamp H1 through an intermediate relay KA 2. Therefore, it can be observed from the flashing state of the operation/rotation speed indicator lamp H1 whether the passive end of the device is rotating: the driven end stops rotating when the driven end is always bright and does not flicker; the device is always out of flashing, the rotation of the passive end can be stopped, the fault failure of an element proximity switch SQ2 or an intermediate relay KA2 can be detected, and the maintenance can be arranged; an experienced operator can judge whether the rotating speed of the driven end is normal or not through the flashing speed of the running/rotating speed indicator lamp H1.

After the intermediate relay KA3 triggers the action because of the stall, the stall fault warning lamp H2 can be continuously lighted, which indicates that the motor stall is not caused by other reasons (for example, overload causes fuse FU to be fused, and motor overload causes the action of the thermal relay FR and artificial shutdown, etc.), but is caused by the stall of the passive end, so that the fault can be accurately judged by operators and maintenance personnel. The stall failure warning lamp H2 can be set to an audible and visual alarm, and can warn the operator in a wide range and at a long distance.

Meanwhile, the passive end anti-stall circuit is self-locked through the intermediate relay KA3, so that an operator cannot restart the equipment by pressing the starting button SB2, and can restart the equipment only by pressing the stall reset button SB3 to destroy the self-locking of the intermediate relay KA 3. The stall reset button SB3 can be installed in the position of keeping away from field operation personnel, only after the maintenance personal repair equipment, is reset by the maintenance personal, avoids the maloperation and brings the incident.

Drawings

The invention will be further described with reference to the accompanying drawings and specific embodiments,

FIG. 1 is a schematic diagram of a passive-end anti-stall circuit of the present invention;

FIG. 2 is a schematic diagram of the structure of the substrate of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the present invention, unless otherwise expressly specified or limited, the terms "disposed," "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected or detachably connected; may be a mechanical connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.