Control circuit for a mine belt conveyor

Abstract

The application provides a control circuit of a mine belt conveyor, which comprises an original conveyor control circuit, a rectification structure, a delay power-on time relay, a second intermediate relay and a PLC centralized control system. The intermediate relay in the second target circuit is used for receiving an input 220V alternating voltage; the intermediate relay in the first target circuit is used for transmitting the 220V alternating voltage to a rectifier and sending a signal to the PLC centralized control system; the PLC centralized control system is used for controlling the rectifier to convert the 220V alternating voltage into 24V direct current voltage; the rectification structure is used for receiving the 24V direct current voltage and transmitting the 24V direct current voltage to a motor of the belt conveyor through the control circuit; and the PLC centralized control system is further used for controlling the delay power-on time relay based on a preset start-stop program to prolong the starting time of the motor. The control circuit changes the control voltage from 220V alternating current to 24V direct current, so that the phenomenon of voltage loss of the control voltage can be avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal mine equipment, and in particular to a control circuit of a mine belt conveyor. BACKGROUND

[0002] At present, in the field of coal mine underground transportation and the like, a belt conveyor (such as a belt machine) is often needed to convey articles. Among them, the belt conveyor needs to transmit a control voltage to a motor by a control circuit, so as to drive the belt to run by the motor powered on.

[0003] In the related art, the control circuit of the belt conveyor usually transmits 220V alternating current to the motor. However, for the underground belt conveyor, the distance from the power distribution room providing the control voltage to the belt conveyor is far, which can reach 300 meters, and in order to enlarge the working range of the coal conveying belt conveyor, the transmission distance of the control voltage is far, and the voltage loss often occurs. Further, the motor stops working and needs to be powered on again. The frequent start and stop of the motor can cause the motor to burn out.

[0004] Therefore, how to avoid the voltage loss of the belt conveyor becomes a problem to be solved at present. SUMMARY

[0005] The present application aims to at least solve one of the technical problems in the related art to some extent.

[0006] To this end, the first object of the present application is to provide a control circuit of a mine belt conveyor, which changes the control voltage from 220V alternating current to 24V direct current, can avoid the phenomenon of voltage loss of the control voltage, and increases protection for the start and stop of the motor through a PLC centralized control system, to avoid frequent start and stop of the motor.

[0007] The second object of the present application is to provide a starting system of a mine belt conveyor.

[0008] To achieve the above object, the first aspect of the present application provides a control circuit of a mine belt conveyor, which comprises: an original conveyor control circuit, a rectifier structure, a delay power-on time relay, a second intermediate relay and a programmable logic controller (PLC) centralized control system, wherein,

[0009] The first contact of the second intermediate relay is arranged in a first target line in the original conveyor control circuit, and the first contact is used to connect the original conveyor control circuit and the PLC centralized control system;

[0010] The second contact and the coil of the second intermediate relay are arranged in a second target line in the original conveyor control circuit, and the second contact is connected with the coil of the second intermediate relay;

[0011] The contact of the time-delay power-on time relay and the coil of the time-delay power-on time relay and the third contact of the second intermediate relay are arranged in a third target line in the original conveyor control line, the second end of the third contact is connected with the first end of the contact of the time-delay power-on time relay, and the second end of the contact of the time-delay power-on time relay is connected with the coil of the time-delay power-on time relay; the rectification structure is connected with the original conveyor control line through the intermediate relays;

[0012] The intermediate relay in the second target line is used for receiving an input 220V alternating voltage and transmitting the 220V alternating voltage to the first target line; the intermediate relay in the first target line is used for transmitting the 220V alternating voltage to the rectifier and sending a signal to the PLC centralized control system;

[0013] The PLC centralized control system is used for controlling the rectifier to convert the 220V alternating voltage into a 24V direct current voltage, and the rectification structure is used for receiving the 24V direct current voltage and transmitting the 24V direct current voltage to the motor of the belt conveyor based on the control line;

[0014] The PLC centralized control system is also used for controlling the time-delay power-on time relay based on a preset start-stop program to prolong the starting time of the motor.

[0015] Optionally, in an embodiment of the present application, the rectification structure comprises a first intermediate relay, a second intermediate relay, a third intermediate relay, a first button and a second button, wherein the negative pole of the 24V direct current voltage is connected with the contact of the third intermediate relay and the first end of the second button, and the second end of the contact of the third intermediate relay is connected with the first end of the first button; the second end of the first button is connected with the first end of the coil of the first intermediate relay, and the second end of the second button is connected with the first end of the coil of the second intermediate relay; and the positive pole of the 24V direct current voltage is connected with the second end of the coil of the first intermediate relay and the second end of the coil of the second intermediate relay respectively.

[0016] Optionally, in an embodiment of the present application, the first button and the second button are specifically used for controlling the voltage conversion function of the control line of the mine belt conveyor and the opening and closing of the delay start motor function.

[0017] Optionally, in an embodiment of the present application, the rectification structure further comprises an indicator lamp, the indicator lamp is connected between the positive pole and the negative pole of the 24V direct current voltage, and the indicator lamp is used for displaying whether the 24V direct current voltage is converted.

[0018] Optionally, in an embodiment of the present application, the PLC centralized control system is further configured to acquire the actual control voltage transmitted to the motor and the start-stop protection time of the motor, and detect whether the actual control voltage and the start-stop protection time are abnormal based on a preset detection program.

[0019] Optionally, in an embodiment of the present application, the PLC centralized control system is further configured to display the detection result of whether the actual control voltage and the start-stop protection time are abnormal on a display screen of the centralized control system.

[0020] Optionally, in an embodiment of the present application, the PLC centralized control system is further configured to display an alarm information on the display screen when the detection result is abnormal, and send the alarm information to a mobile terminal of a worker based on a wireless communication technology.

[0021] Optionally, in an embodiment of the present application, the PLC centralized control system is further configured to adjust the extended start time parameter in the start-stop program in combination with the real-time demand for the delayed start of the motor and the detection result, so as to adjust the length of time during which the delayed power-on time relay blocks signal transmission.

[0022] Optionally, in an embodiment of the present application, the original conveyor control circuit further comprises a switch state indicator configured to display the opening and closing state of each contact of each intermediate relay, the working state of the delayed power-on time relay, and the working state of related devices in the original conveyor control circuit.

[0023] To achieve the above object, the second aspect embodiment of the present application provides a starting system of a mine belt conveyor, which comprises the control circuit of the mine belt conveyor according to any one of the first aspect embodiments.

[0024] The technical scheme provided by the embodiments of the present application at least brings the following beneficial effects: the present application changes the control voltage from 220V alternating current to 24V direct current, which can avoid the phenomenon of loss of control voltage caused by long-distance transmission, and adds protection for high-voltage start and operation of the motor, encodes the start and stop of the motor into the PLC centralized control system, stabilizes the start of the motor, and avoids frequent start and stop of the motor. Therefore, the present application solves the problem of long-distance loss of voltage, avoids the start and stop of the motor, makes the control voltage more stable, improves the power safety of the motor control voltage, and protects the high-voltage operation and start and stop of the motor, which is beneficial to prolong the service life of the motor, shorten the maintenance time, and improve the operation efficiency of the equipment.

[0025] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0026] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings in which:

[0027] Figure 1 A structural schematic diagram of a control circuit of a mine belt conveyor according to an embodiment of the present application is shown in

[0028] Figure 2 A structural schematic diagram of a rectifier structure according to an embodiment of the present application is shown in

[0029] Figure 3 A structural schematic diagram of a starting system of a mine belt conveyor according to an embodiment of the present application is shown in DETAILED DESCRIPTION

[0030] Embodiments of the present application are described in detail below with reference to the attached drawings, which show by way of example, embodiments in which like reference numerals refer to like elements or elements having similar functions. The embodiments described below are exemplary and are intended to be illustrative of the present application and are not to be construed as limiting the present application.

[0031] It should be noted that for a long time, a very important problem that has plagued the operation of the transportation system in underground mining is that the motor of the belt conveyor appears to be stolen. The reason is that the control circuit has a long propagation distance, which can be up to 300 meters or more. The long propagation distance can cause a loss of voltage, and the unstable control voltage can cause the motor to be stolen. Frequent starting of the high-voltage motor can cause the motor to burn out, affecting normal production time and putting pressure on maintenance.

[0032] To this end, the present application proposes a control circuit of a mine belt conveyor, which changes the control voltage AC 220V to DC 24V and writes the motor start-stop into the centralized control PLC. In this way, the control voltage control is stable, and the loss of voltage does not occur, which solves the motor theft and makes the control voltage safe to use.

[0033] A control circuit of a mine belt conveyor according to an embodiment of the present application is described in detail below with reference to the accompanying drawings.

[0034] Figure 1 A structural schematic diagram of a control circuit of a mine belt conveyor according to an embodiment of the present application is shown in Figure 1 The control circuit of the mine belt conveyor includes an original conveyor control circuit 10, a rectifier structure 20, a delay power-on time relay KT, a second intermediate relay KA2, and a programmable logic controller (PLC) centralized control system 30.

[0035] It should be noted that the rectifier structure 20 and the PLC centralized control system 30 are not shown in the original conveyor control circuit 10. Figure 1 Figure 1 In the original conveyor control circuit 10, in addition to the newly added devices such as the delay power-on time relay KT and the second intermediate relay KA2, all the devices are original devices. The newly added devices are shown in the dashed box in FIG. 1. That is, the original conveyor control circuit is a conveyor control circuit in the related art, which can be a part of the electrical circuit of a belt conveyor starting cabinet. The devices included in the original conveyor control circuit 10 and the connection structure can be set according to the setting mode in the related art and combined with the specific situation of the belt conveyor currently applied. For example, as shown in FIG. 1, the original conveyor control circuit 10 includes a first control switch SA1, a second control switch 1KK, an air switch 1DK, and a connecting piece LP1, and the rest of the components included in the original conveyor control circuit 10 and the functions of each component are not described here. Figure 1

[0036] It should be further noted that, as shown in FIG. 1, the original conveyor control circuit includes multiple lines, such as the 22nd line to the 40th line shown in the figure. Each line can be connected to multiple devices, and the present application selects some of the lines as target lines for adding devices to achieve the function of the control circuit of the present application through the added part. Figure 1

[0037] The first contact KA21 of the second intermediate relay KA2 is arranged in the first target line (i.e., the 29th line) in the original conveyor control circuit 10, and the first contact KA21 is used to connect the original conveyor control circuit 10 and the PLC centralized control system 30.

[0038] The second contact KA22 of the second intermediate relay and the coil KA20 are arranged in the second target line (i.e., the 35th line) in the original conveyor control circuit 10, and the second contact KA22 is connected to the coil KA20 of the second intermediate relay.

[0039] The contact KT1 of the delay power-on time relay KT and the coil KT0 of the delay power-on time relay KT, and the third contact KA23 of the second intermediate relay are arranged in the third target line (i.e., the 36th line) in the original conveyor control circuit 10, the second end of the third contact KA23 is connected to the first end of the contact KT1 of the delay power-on time relay, and the second end of the contact KT1 of the delay power-on time relay is connected to the coil KT0 of the delay power-on time relay.

[0040] ​​​The rectification structure 20 is connected to the original conveyor control line 10 through a plurality of intermediate relays. That is, the rectification structure 20 includes a plurality of added intermediate relays, and some of the intermediate relays can be arranged in the original conveyor control line 10 to realize the return of the converted DC voltage to the control line for the transmission of the control voltage.

[0041] Specifically, the control line of the mine belt conveyor of the present application is provided with intermediate relays and a delay power-on time relay in some target lines of the original conveyor control line and the modified rectification structure. The intermediate relay is a device for transmitting signals and simultaneously controlling a plurality of circuits and electrical execution elements, and has a large number of contact points. The intermediate relay includes a core, a spring, a moving contact, a stationary contact, a coil, a terminal, and a housing. The intermediate relay is used for switching control and voltage conversion, etc. on the basis of increasing the number of contact points for easy connection.

[0042] The present application provides a plurality of intermediate relays, including the second intermediate relay KA2 described above. The model of each intermediate relay and the target line where the contact and coil of the intermediate relay are located can be adjusted according to actual conditions, and is not limited to the line defined in the above example.

[0043] The intermediate relay in the second target line is used to receive the input 220V AC voltage and transmit it to the first target line. The intermediate relay in the first target line is used to transmit the 220V AC voltage to the rectifier and send a signal to the PLC centralized control system 30.

[0044] The PLC centralized control system 30 is used to control the rectifier to convert the 220V AC voltage into a 24V DC voltage. The rectification structure is used to receive the 24V DC voltage to transmit the 24V DC voltage to the motor of the belt conveyor based on the control line.

[0045] The PLC centralized control system 30 is also used to control the delay power-on time relay KT based on a preset start-stop program to prolong the starting time of the motor.

[0046] Specifically, in the actual application, when transmitting the control voltage, the working principle of the main line of the conveyor starting system to which the control line belongs is unchanged. After receiving the 220V alternating voltage transmitted by the distribution room, for the target lines 29, 35 and 36, a starting point is output from the air switch 1DK contained in the original conveyor control line 10, transmitted to the 31 line through the KA2 intermediate relay (in this embodiment, the model of 220V is selected) added at the 35 line, and then transmitted to the 29 line through the PLC centralized control system 30 connected with the 31 line and the 29 line. After the PLC centralized control system 30 receives the signal (which can be the signal sent by the intermediate relay in the first target line) that needs to be converted, the rectifier converts the 220V alternating voltage to 24V direct current.

[0047] Further, the rectifier structure 20 receives the converted 24V direct current voltage. The components and connection modes of the rectifier structure 20 can be determined according to actual needs.

[0048] As one of the possible implementation manners, in an embodiment of the present application, as shown in Figure 2 the rectifier structure 20 added in the control line includes a first intermediate relay KA1, a second intermediate relay KA2, a third intermediate relay KA3, a first button SB1 and a second button SB2.

[0049] The negative pole of the 24V direct current voltage is connected with the first end of the contact of the third intermediate relay KA3 and the first end of the second button SB2, and the second end of the contact of the third intermediate relay is connected with the first end of the first button SB1.

[0050] The second end of the first button SB1 is connected with the first end of the coil KA10 of the first intermediate relay KA1, and the second end of the second button SB2 is connected with the first end of the coil KA20 of the second intermediate relay.

[0051] The positive pole of the 24V direct current voltage is connected with the second end of the coil KA10 of the first intermediate relay and the second end of the coil KA20 of the second intermediate relay, respectively.

[0052] As described above, the control voltage transmitted in the control line in the present application is DC24V, and the voltage initially provided by the distribution room is AC220V. Therefore, by installing the intermediate relay, the present application can separate the direct current from the alternating current and the high voltage from the low voltage, which is convenient for subsequent maintenance and is conducive to the safe use of the control line.

[0053] In an embodiment of the present application, the installation position and setting mode of the added rectifier can be determined according to actual needs, such as being arranged in the distribution room close to the control line, so as to be connected with the rectifier structure 20 of the present application.

[0054] Further, it can be understood that the motor of the belt conveyor may be frequently started and stopped in actual operation due to various factors such as production factors and control deviation. In order to avoid the motor from being burned due to frequent starting, the control circuit of the application further adds a delay power-on time relay for protection of high-voltage starting and operation of the motor.

[0055] Specifically, as described above, the application encodes the start and stop of the motor into the PLC centralized control system, and the PLC centralized control system 30 can control the delay power-on time relay KT based on the pre-written start and stop program. When the engine is stopped and started again, the delay power-on time relay in the third target line (line 36) will block the signal transmission in less than the preset time, so as to prolong the starting time to protect the high-voltage motor.

[0056] Among them, when the delay power-on time relay KT is powered on, the delay contact is not in action, and after the pre-set delay time, the delay normally closed contact is disconnected, and the delay normally open contact is closed, so as to realize the transmission of control voltage to start the motor after the preset delay time.

[0057] In an embodiment of the application, the first button SB1 and the second button SB2 in the rectification structure described above are specifically used to control the opening and closing of the voltage conversion function and the delay starting motor function of the control circuit of the mine belt conveyor. Specifically, by disconnecting the first button SB1 or the second button SB2, the path of the rectification structure 20 can be disconnected to turn off the voltage conversion function. Since the delay power-on time relay KT is connected with the third contact KA23 of the second intermediate relay, and the second button SB2 is also connected with the coil of the second intermediate relay, by controlling the operation of the second button SB2, the delay power-on time relay KT can be disconnected or adjusted. In actual application, the first button SB1 or the second button SB2 can be controlled by the PLC centralized control system 30 to adjust the function realized by the control circuit, or the intermediate relays and the delay power-on time relay can also be adjusted directly by the PLC centralized control system 30.

[0058] In an embodiment of the application, as shown in Figure 2 The rectification structure 20 further comprises an indicator lamp 21 connected between the positive and negative poles of the 24V DC voltage, which is used to display whether the 24V DC voltage is converted. Specifically, the indicator lamp 21 can be separately arranged in one loop of the rectification structure 20, and when the rectification structure 20 normally transmits the 24V DC voltage, the indicator lamp 21 can be turned on to quickly know whether the 24V DC voltage conversion is normally performed according to the state of the indicator lamp 21.

[0059] In an embodiment of the present application, the PLC centralized control system 30 is further configured to acquire the actual control voltage transmitted to the motor and the start-stop protection time of the motor, and detect whether the actual control voltage and the start-stop protection time are abnormal based on a preset detection program.

[0060] Specifically, in the embodiment, the PLC centralized control system 30 has an automatic detection function. During actual operation, the PLC centralized control system 30 can acquire the feedback results of the actual control voltage transmitted to the motor and the start-stop protection time of the motor after the current control operation, and input the real-time control voltage and the start-stop protection time into the detection program to detect whether the actual operation values reach the expected values. In combination with the running state of the belt conveyor, the PLC centralized control system 30 can determine whether the control voltage is stable and whether the start-stop protection time of the motor is set reasonably.

[0061] Further, in the embodiment, the PLC centralized control system 30 is further configured to display the detection results of whether the actual control voltage and the start-stop protection time are abnormal on the display screen of the centralized control system. When the detection results are abnormal, the PLC centralized control system 30 displays alarm information on the display screen and sends the alarm information to the mobile terminal of the worker based on wireless communication technology.

[0062] Specifically, the PLC centralized control system 30 displays the automatic detection results on the display screen of the centralized control system of the ground workstation in real time, so that the worker can timely know whether the current control voltage in the control circuit is stable, whether the start-stop protection of the motor is normal, and the length of the start-stop protection. When it is determined that the control voltage is unstable and the start-stop protection time of the motor does not meet the requirements, the PLC centralized control system 30 can display a text alarm information, such as “the current control voltage fluctuates”, on the display screen of the ground centralized control system and perform voice broadcast. In addition, the PLC centralized control system 30 can transmit the alarm information to the communication base station at each position in the underground through the underground optical fiber transmission based on wireless communication technology such as 5G communication, and then send the alarm information to the mobile terminal, such as the explosion-proof mobile phone, of the worker connected in advance, so that the workers on the ground and in the underground can timely know the abnormal condition and timely eliminate the fault occurred on the ground or in the underground according to the abnormal reason.

[0063] Further, the PLC centralized control system 30 is further configured to adjust the lengthening start time parameter in the start-stop program in combination with the real-time demand for the delay start of the motor and the detection results, so as to adjust the length of the delay power-on time relay blocking signal transmission. Specifically, when the length of the delay start of the motor previously set does not meet the current running condition of the belt conveyor, the PLC centralized control system 30 can adjust the delay protection time by increasing or decreasing the lengthening start time parameter in the start-stop program, so as to adjust the length of the delay power-on time relay blocking signal transmission to meet the current demand for the start-stop protection of the motor.

[0064] In one embodiment of the present application, the original conveyor control circuit 10 further comprises a switch state indicator CKD. The switch state indicator is used to display the opening and closing state of each contact of the intermediate relay, the working state of the time delay power-on time relay, and the working state of the related devices in the original conveyor control circuit. Specifically, the switch state indicator circuit can be arranged in the original conveyor control circuit 10, and the switch state indicator can receive the detected working state of each related device transmitted in the circuit, such as the state of the normally closed contact and the normally open contact of the current time delay power-on time relay, to determine whether the time delay power-on time relay is performing the start protection work. For example, the working state of the first control switch SA1 and the second control switch 1KK in the original conveyor control circuit 10 can be displayed to clearly and intuitively show the state of each device in the control circuit.

[0065] As an example, the switch state indicator can be composed of a plurality of indicator lights, each corresponding to a state of a related device. After the mapping relationship is programmed in advance, the corresponding state indicator light is controlled to be on according to the current working state of the related device.

[0066] Therefore, the PLC centralized control system controls the relay to perform the functions of voltage conversion and delay start, which can avoid frequent replacement of relays and save costs compared to manual control of the relay.

[0067] In summary, the control circuit of the mine belt conveyor of the embodiment of the present application changes the control voltage from 220V AC to 24V DC, which can avoid the phenomenon of loss of control voltage caused by long-distance transmission, and adds protection for high-voltage starting and running of the motor. The start and stop of the motor are programmed into the PLC centralized control system, which makes the motor start stably and avoids frequent start and stop of the motor. Therefore, the control circuit solves the problem of long-distance loss of voltage, avoids the motor from stopping, makes the control voltage more stable, improves the power safety of the motor control voltage, and protects the high-voltage running and start and stop of the motor, which is beneficial to prolong the service life of the motor, shorten the maintenance time, and improve the operation efficiency of the equipment.

[0068] In order to realize the above-mentioned embodiment, the embodiment of the present application further provides a starting system of a mine belt conveyor. Figure 3 A structural schematic diagram of a starting system of a mine belt conveyor provided by the embodiment of the present application.

[0069] As Figure 3As shown, the starting system 100 of the mine belt conveyor can include the control circuit 200 of the mine belt conveyor as described in the above embodiments. That is, the control circuit of the belt conveyor in the embodiments of the present application is part of the starting system, and can be arranged in the main circuit of the starting system of the mine belt conveyor. The starting system 100 of the mine belt conveyor can be a whole system such as a starting cabinet of the mine belt conveyor which controls the starting and running of the belt conveyor. Other components included in the starting cabinet and the whole electrical control principle can refer to the starting cabinet of the conveyor in the related art, and will not be described here.

[0070] Therefore, the starting system 100 of the embodiments of the present application can make the starting of the motor of the belt conveyor stable, control the stable voltage, and improve the overall running efficiency of the starting system 100 by applying the control circuit 200 carried thereby.

[0071] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0072] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0073] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0074] In the present application, unless otherwise explicitly specified and limited, a first feature is "on" or "under" a second feature can mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature is "over", "above" and "on top of" the second feature can mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. The first feature is "under", "below" and "underneath" the second feature can mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0075] Although the embodiments of the present application have been shown and described above, it is to be understood that the above-described embodiments are exemplary only, and are not to be construed as limiting the present application, and that changes, modifications, substitutions and variations can be made thereto by those skilled in the art without departing from the scope of the present application.

Claims

1. A control circuit for a mining belt conveyor, characterized in that: include: The original conveyor control circuit, rectifier structure, time delay power-on time relay, second intermediate relay and programmable logic controller PLC centralized control system, among which, The first contact of the second intermediate relay is arranged in the first target circuit in the original conveyor control circuit, and the first contact is used to connect the original conveyor control circuit with the PLC centralized control system; The second contact and the coil of the second intermediate relay are arranged in the second target circuit in the original conveyor control circuit, and the second contact is connected to the coil of the second intermediate relay; The contact and coil of the time delay power-on time relay, and the third contact of the second intermediate relay are arranged in the third target circuit in the original conveyor control circuit, the second end of the third contact is connected to the first end of the contact of the time delay power-on time relay, and the second end of the contact of the time delay power-on time relay is connected to the coil of the time delay power-on time relay; the rectifier structure is connected to the original conveyor control circuit through a plurality of intermediate relays; The intermediate relay in the second target line is used to receive the input 220V AC voltage and transmit it to the first target line; the intermediate relay in the first target line is used to transmit the 220V AC voltage to the rectifier and send a signal to the PLC centralized control system; The PLC centralized control system is used to control the rectifier to convert the 220V AC voltage into a 24V DC voltage, and the rectifier structure is used to receive the 24V DC voltage and transmit the 24V DC voltage to the motor of the belt conveyor based on the control circuit; The PLC centralized control system is also used to control the delayed power-on time relay based on a preset start-stop program to extend the starting time of the motor.

2. The control circuit of the mining belt conveyor according to claim 1, characterized in that: The rectification structure includes: a first intermediate relay, a second intermediate relay, a third intermediate relay, a first button and a second button, wherein: The negative electrode of the 24V DC voltage is connected to the contact of the third intermediate relay and the first end of the second button, and the second end of the contact of the third intermediate relay is connected to the first end of the first button; The second end of the first button is connected to the first end of the coil of the first intermediate relay, and the second end of the second button is connected to the first end of the coil of the second intermediate relay; The positive electrode of the 24V DC voltage is connected to the second end of the coil of the first intermediate relay and the second end of the coil of the second intermediate relay respectively.

3. The control circuit of the mining belt conveyor according to claim 2, characterized in that: The first button and the second button are specifically used to: Control the opening and closing of the voltage conversion function and the delayed start motor function of the control circuit of the mining belt conveyor.

4. The control circuit of the mining belt conveyor according to claim 2, characterized in that: Also includes: An indicator light is connected between the positive pole and the negative pole of the 24V DC voltage, and the indicator light is used to display whether the 24V DC voltage is converted.

5. The control circuit of the mining belt conveyor according to claim 1, characterized in that: The PLC centralized control system is also used for: The control voltage actually transmitted to the motor and the start / stop protection time of the motor are obtained, and whether the actual control voltage and the start / stop protection time are abnormal is detected based on a preset detection program.

6. The control circuit of the mining belt conveyor according to claim 5, characterized in that: The PLC centralized control system is also used for: The detection result of whether the actual control voltage and the start-stop protection time are abnormal is displayed on the display screen of the centralized control system.

7. The control circuit of the mining belt conveyor according to claim 6, characterized in that: The PLC centralized control system is also used for: When the detection result is abnormal, an alarm message is displayed on the display screen, and the alarm message is sent to the mobile terminal of the staff based on wireless communication technology.

8. The control circuit of the mining belt conveyor according to claim 6, characterized in that: PLC centralized control system is also used for: In combination with the real-time demand for delayed starting of the motor and the detection result, the extended starting time parameter in the start-stop program is adjusted to adjust the duration of the delayed power-on time relay blocking signal transmission.

9. The control circuit of the mining belt conveyor according to claim 1, characterized in that: The original conveyor control circuit also includes: a switch status indicator, The switch status indicator is used to display the opening and closing status of each contact of each intermediate relay, the working status of the delayed power-on time relay, and the working status of related devices in the original conveyor control circuit.

10. A starting system for a mining belt conveyor, characterized in that: The invention comprises a control circuit of a mining belt conveyor according to any one of claims 1 to 9.

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