CN220985316U - Overload current early warning device for overload protection of conveyor driving motor - Google Patents
Overload current early warning device for overload protection of conveyor driving motor Download PDFInfo
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- CN220985316U CN220985316U CN202322626460.2U CN202322626460U CN220985316U CN 220985316 U CN220985316 U CN 220985316U CN 202322626460 U CN202322626460 U CN 202322626460U CN 220985316 U CN220985316 U CN 220985316U
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- 239000003245 coal Substances 0.000 description 22
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Abstract
The utility model provides an overload current early warning device for overload protection of a conveyor driving motor, and particularly relates to the technical field of circuit protection. The utility model provides an overload current early warning device of conveyer driving motor overload protection, includes power, current transformer, programmable logic controller, time relay and audible and visual alarm, star connection is done to current transformer secondary winding one end, and the star is connected with PLC's GND port, and secondary winding's the other end is connected with PLC's analog input port La, lb and Lc. The utility model has the beneficial effects that: the utility model adopts the delay characteristic of overload protection of the motor, the audible and visual alarm is sent out by the device, and the staff takes corresponding effective measures according to different prompts of early warning, so that the conveyor is prevented from being stopped due to overload protection, thereby protecting the motor, avoiding the stop accident caused by overload of the conveyor, and greatly improving the operation and production efficiency of the conveyor.
Description
Technical Field
The utility model mainly relates to the technical field of circuit protection, in particular to an overload current early warning device for overload protection of a conveyor driving motor.
Background
In the existing coal mine production, raw coal produced from a coal face and a tunneling face is transported by a scraper conveyor and a belt conveyor.
Because the production conditions of the working face are special, the coal yield is uneven, and the load of the conveyor is negligent. In particular to a fully-mechanized coal mining face, which adopts a caving coal process, is influenced by rock structure, and the load of a conveyor is easily increased suddenly due to more times and less coal quantity during caving, so that a driving motor of the conveyor is overloaded in a short time. When the load of the conveyor exceeds the transportation capacity and reaches the action time limit, the overload protection of the control switch acts, and the control switch trips, so that the motor is protected. However, after the overload of the control switch trips, the conveyor stops running, and the loading on the conveyor is not stopped, so that the conveyor is increased in overload. Because the coal amount on the conveyor exceeds the transportation capacity, the overload protection of the control switch can be operated again because the conveyor cannot be started again.
The conventional treatment method is that loading to the conveyor is stopped, then a power failure of a control switch of the conveyor is closed, and excessive coal is cleaned manually, so that the conveyor can be restarted. After the conveyor runs normally, the discharged coal is loaded on the conveyor. The processing method has the advantages of large investment of manpower and long time consumption, greatly reduces the production efficiency, and can lead to the production stop of the whole working face when serious, so the utility model provides the overload current early warning device for overload protection of the conveyor driving motor.
Disclosure of utility model
In order to solve the defects in the prior art, the utility model provides an overload current early warning device for overload protection of a driving motor of a conveyor.
The utility model aims to achieve the aim, and the aim is achieved by the following technical scheme:
The utility model provides an overload current early warning device of conveyer driving motor overload protection, includes power, current transformer, programmable logic controller, time relay and audible and visual alarm, star connection is done to current transformer secondary winding one end, and the star is connected with PLC's GND port, and secondary winding's the other end is connected with PLC's analog input port La, lb and Lc.
The power supply is connected with an L1 port and an N port of the PLC, three time relays are arranged, one ends of three time relay coils 1J, 2J and 3J are respectively connected with analog output ports 1.2, 1.3 and 1.4 of the PLC, and the other ends of the time relay coils are connected with an L+ port of the PLC.
The audible and visual alarm device comprises an audible alarm device and a visual alarm device, wherein the audible alarm device comprises an L 1 alarm lamp, an L 2 alarm lamp and an L 3 alarm lamp, the visual alarm device comprises a first alarm device S1 and a second alarm device S2, the L 1 alarm lamp, the L 2 alarm lamp and the L 3 alarm lamp are respectively connected with the contact switches 1J-1, 2J-1 and 3J-1 of three time relays in series, the first alarm device S1 is connected with the alarm lamp L 2 in parallel, and the second alarm device S2 is connected with the alarm lamp L 3 in parallel.
The L 1 warning lamp, the L 2 warning lamp and the L 3 warning lamp which are arranged by the light warning device are respectively green-yellow-red three-color lamps.
Compared with the prior art, the utility model has the beneficial effects that:
The overload current early warning device for overload protection of the conveyor driving motor utilizes two necessary conditions of overload protection action, namely that the working current of the conveyor motor exceeds a certain multiple of rated current; and secondly, different delay times of protection actions when rated currents are different multiples. The PLC receives the current value of the current transformer and compares the current value with a preset current value, and when overload protection is delayed and does not act, different audible and visual alarms are sent out to prompt a worker to take effective measures in the time of the protection delay, so that the load of the conveyor is reduced, and the working current of the motor is reduced to be within the rated current value. Therefore, the motor can be protected, the defects caused by the stopping of the conveyor due to overload protection action can be avoided, the stopping accident caused by overload can be greatly reduced, and the opening probability is improved.
The overload current early warning device for overload protection of the conveyor driving motor effectively adjusts the coal feeding amount when the conveyor is overloaded, but the overload current early warning device is realized manually. Because of the restriction of manual conditions, the accuracy of adjusting the coal feeding amount is not easy to grasp. Therefore, the automatic control of the coal feeding amount during the overload of the conveyor can be realized by further researching the overcurrent early warning, and the automatic control of the coal feeding amount can also be realized by utilizing the existing network, the PLC, the intelligent module, the intelligent processor and the like under the coal mine
The overload current early warning device for the overload protection of the conveyor driving motor adopts the delay characteristic of the overload protection of the motor, the device sends out audible and visual alarms, and staff adopts corresponding effective measures according to different prompts of the early warning, so that the conveyor is prevented from being stopped due to the overload protection, the motor can be protected, the stop accident caused by the overload of the conveyor can be avoided, and the operation and the production efficiency of the conveyor are greatly improved.
Drawings
Fig. 1 is a schematic diagram of a current early warning device according to the present utility model.
The reference numbers shown in the drawings: 1. a power supply; 2. a current transformer; 3. a programmable logic controller; 4. a stop valve; 5. an audible and visual alarm device; 51. a light alarm device; 52. an audible alarm device.
Detailed Description
The utility model will be further described with reference to the accompanying drawings and specific embodiments. It is to be understood that these examples are illustrative of the present utility model and are not intended to limit the scope of the present utility model. Further, it will be understood that various changes and modifications may be made by those skilled in the art after reading the teachings of the utility model, and equivalents thereof fall within the scope of the utility model as defined by the claims.
Standard parts used in the utility model can be purchased from the market, special-shaped parts can be customized according to the description of the specification and the drawings, the specific connection modes of the parts adopt conventional means such as mature bolts, rivets, welding, pasting and the like in the prior art, and meanwhile, in order to clearly express the connection relation and working principle among the components, the drawings of the specification are arranged and drawn in a mode of a mechanism motion diagram, and are not described in detail.
As shown in fig. 1, an overload current early warning device for overload protection of a conveyor driving motor is characterized by comprising a power supply 1, a current transformer 2, a programmable logic controller 3, a time relay 4 and an audible and visual alarm device 5, wherein one end of a secondary winding of the current transformer 2 is in star connection, a star point is connected with a GND port of a PLC, and the other end of the secondary winding is connected with analog input ports La, lb and Lc of the PLC;
The power supply 1 is connected with an L1 port and an N port of the PLC, three time relays 4 are arranged, one ends of coils 1J, 2J and 3J of the time relays 4 are respectively connected with analog output ports 1.2, 1.3 and 1.4 of the PLC, and the other ends of the coils are connected with an L+ port of the PLC.
The audible and visual alarm 5 includes an audible alarm 51 and an audible alarm 52, the audible alarm 51 includes an L 1 alarm, an L 2 alarm, and an L 3 alarm, the audible alarm 52 includes a first alarm S1 and a second alarm S2, an L 1 alarm, an L 2 alarm, and an L 3 alarm are connected in series with the contact switches 1J-1, 2J-1, 3J-1 of the three time relays 4, respectively, the first alarm S1 is connected in parallel with the alarm L 2, and the second alarm S2 is connected in parallel with the alarm L 3.
Further, the warning light L 1, the warning light L 2 and the warning light L 3 set by the light warning device 51 are respectively green-yellow-red three-color lamps.
Working principle:
The preset current value (generally, the rated current of the conveyor motor and the current value converted by the transformer transformation ratio) is stored in a storage device of the PLC. After the conveyor is started, the current values of the current transformers LH a、LHb and LH c enter the PLC through the analog input ports L a、Lb and L c of the PLC and are compared with preset stored current values, and when the maximum current values received by the three analog input ports exceed the rated current value by a certain number of bits, the acousto-optic warning device can send out an acousto-optic warning. Alarms are divided into three layers: the first layer, the warning light L1 is on, and green light alarm is given; the warning lamp L2 is on at the second level, and emits yellow light alarm, and meanwhile, the first sound alarm S1 emits early warning; third, the warning lamp L3 is lightened to emit red light alarm, and meanwhile, the second sound alarm S2 emits early warning.
Early warning the first level. When the PLC receives the current value of the current transformer in real time through the analog input ports L a、Lb and L c, and the current value is compared with the preset current value, and the maximum value of the current is larger than the rated current of the motor and smaller than 1.2 times of the rated current, the action time of overload protection is longer than 20min. At this time, the PLC outputs a signal through the analog output port 1.2, and the relay coil 1J connected with the analog output port 1.2 is electrified and attracted to drive the normally open contact 1J-1 to be closed, so that the warning lamp L1 is electrified to emit a green light alarm. At this time, the worker should pay attention to observe the coal loading condition on the conveyor. If the coal carrying capacity is reduced, no treatment can be carried out; if the coal carrying capacity is not increased any more, preparation for reducing the coal carrying capacity on the conveyor is needed, and the load increase of the conveyor is convenient to control in advance.
And early warning the second level. When the maximum current value received by the three input ports of the PLC analog quantity is 1.2-1.5 times of the rated current of the motor, the overload protection action time of the motor is 5-20min according to the table 1. At this time, the PLC outputs a signal through the analog output port 1.3, and the relay coil 2J connected with the analog output port 1.3 is electrified and attracted to drive the normally open contact 2J-1 to be closed, so that the warning lamp L2 is electrified to emit yellow light alarm. At the same time, the first alarm device S1 of the audible alarm is energized, and an audible alarm is issued. The change condition of the coal carrying capacity of the conveyor can be observed by a worker for 1-2min, and then corresponding treatment is carried out.
And early warning the third level. When the maximum current value received by the three input ports of the PLC analog quantity is 1.5-6 times of the rated current of the motor, the overload protection action time of the motor is 1-3min according to the table 1. At this time, the PLC outputs a signal through the analog output port 1.4, and the relay coil 3J connected with the analog output port 1.4 is electrified and attracted to drive the normally open contact 3J-1 to be closed, so that the warning lamp L3 is electrified to emit red light alarm. At the same time, the second alarm device S2 of the audible alarm is energized, and an audible alarm is issued. At this time, the staff should deal with in time, take effective measure to reduce the coal loading amount of the conveyor or stop feeding coal to the conveyor.
Claims (2)
1. The overload current early warning device for the overload protection of the conveyor driving motor is characterized by comprising a power supply (1), a current transformer (2), a PLC programmable controller (3), a time relay (4) and an audible and visual alarm device (5), wherein the PLC programmable controller (3) comprises La, lb, lc, GND ports, one end of a secondary winding of the current transformer (2) is in star connection, a star point is connected with a GND port of the PLC, and the other end of the secondary winding is connected with analog input ports La, lb and Lc of the PLC;
The power supply (1) is connected with an L1 port and an N port of the PLC, three time relays (4) are arranged, one ends of coils 1J, 2J and 3J of the time relays (4) are respectively connected with analog output ports 1.2, 1.3 and 1.4 of the PLC, and the other ends of the coils are connected with an L+ port of the PLC;
The audible and visual alarm device (5) comprises an audible alarm device (51) and a visual alarm device (52), the audible alarm device (51) comprises an L 1 alarm lamp, an L 2 alarm lamp and an L 3 alarm lamp, the visual alarm device (52) comprises a first alarm device S1 and a second alarm device S2, the L 1 alarm lamp, the L 2 alarm lamp and the L 3 alarm lamp are respectively connected with the contact switches 1J-1, 2J-1 and 3J-1 of the three time relays (4) in series, the first alarm device S1 is connected with the alarm lamp L 2 in parallel, and the second alarm device S2 is connected with the alarm lamp L 3 in parallel.
2. The overload current early warning device for overload protection of a conveyor driving motor according to claim 1, wherein the L 1 warning lamp, the L 2 warning lamp and the L 3 warning lamp which are respectively provided by the light alarm device (51) are green-yellow-red three-color lamps.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322626460.2U CN220985316U (en) | 2023-09-26 | 2023-09-26 | Overload current early warning device for overload protection of conveyor driving motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322626460.2U CN220985316U (en) | 2023-09-26 | 2023-09-26 | Overload current early warning device for overload protection of conveyor driving motor |
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| CN220985316U true CN220985316U (en) | 2024-05-17 |
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| CN202322626460.2U Active CN220985316U (en) | 2023-09-26 | 2023-09-26 | Overload current early warning device for overload protection of conveyor driving motor |
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