Mud scraper control box circuit and mud scraper control box

Abstract

The utility model provides a mud scraper control box circuit and a mud scraper control box, and relates to the technical field of water treatment equipment, and the mud scraper control box circuit comprises a fan motor control circuit and a mud scraper main motor control circuit; the fan motor control circuit comprises a thermal relay, a first contactor, a second circuit breaker and a first circuit breaker which are sequentially connected with the fan motor, and the first circuit breaker is connected with a three-phase alternating current power supply; the mud scraper main motor control circuit comprises a frequency converter connected with a mud scraper main motor, the frequency converter is connected with a first circuit breaker, and the first circuit breaker is connected with a three-phase alternating current power supply. RB and RC terminals of the frequency converter are connected with the torque controller, and the torque controller is connected with the torque sensor. An AI1 terminal and a GND terminal of the frequency converter are connected with the remote DCS; an AO1 terminal and a GND terminal of the frequency converter are connected with a remote DCS; and a second contactor is connected between the 24v wiring terminal and the DI1 terminal of the frequency converter. According to the utility model, flexible control and safety protection of the mud scraper are realized.

Description

Technical Field

[0001] The utility model relates to the technical field of water treatment equipment, in particular to a mud scraper control box circuit and a mud scraper control box. Background Art

[0002] In the municipal sewage and industrial wastewater industries, sedimentation tank technology has become a mature and most common water treatment process, in which the scraper is one of its supporting process equipment. As a result, the control box suitable for the operation of the scraper becomes more and more important.

[0003] At present, traditional control boxes are applicable to fewer operating conditions, cannot achieve remote control, have fewer protection functions, and are prone to failure;

[0004] Therefore, we continue to provide a control box that is suitable for various operating conditions, has multiple protection functions, and can be flexibly connected to the outside to achieve flexible control and safety protection of the scraper. Utility Model Content

[0005] In view of the technical problems existing in the background technology, this utility model patent provides a scraper control box circuit and a scraper control box, which can realize the operation control of local and remote working conditions, provide multiple protection functions, and can flexibly communicate with the outside.

[0006] To achieve the above purpose, the technical solution of the utility model is: a scraper control box circuit, including a fan motor control circuit and a scraper main motor control circuit;

[0007] The fan motor control circuit comprises a thermal relay, a first contactor, a second circuit breaker and a first circuit breaker connected to the fan motor in sequence, wherein the first circuit breaker is connected to a three-phase AC power supply;

[0008] The main motor control circuit of the scraper includes a frequency converter connected to the main motor of the scraper, the frequency converter is connected to a first circuit breaker, and the first circuit breaker is connected to a three-phase AC power supply;

[0009] The RB and RC terminals of the frequency converter are connected to the torque controller, and the torque controller is connected to the torque sensor; the AI1 and GND terminals of the frequency converter are connected to the remote DCS to receive the remote frequency setting signal; the AO1 and GND terminals of the frequency converter are connected to the remote DCS to provide frequency feedback to the remote DCS; a second contactor is connected between the 24V terminal and the DI1 terminal of the frequency converter.

[0010] As a further improvement of the utility model, the power terminal of the three-phase AC power supply is first connected to a fuse, and then connected to the fan motor control circuit and the main motor control circuit, so as to realize overheat protection of the scraper control box circuit.

[0011] As a further improvement of the present invention, a first branch is provided between the power terminal of the three-phase AC power supply and the neutral line, and a power signal light is connected to the first branch. The power signal light indicates the power supply, and the power connection status can be known.

[0012] As a further improvement of the utility model, a second branch is provided between the power connection of the three-phase AC power supply and the neutral line, and an emergency stop button, a first intermediate relay and an adjusting knob are provided on the second branch in sequence, and a stop button, a start button, a first contactor and a thermal relay are provided behind the adjusting knob, and the thermal relay is connected to the neutral line;

[0013] The stop button is closed in the initial state, the start button is disconnected in the initial state, and the adjustment knob is not connected to the circuit in the initial state. After adjustment, the first intermediate relay and the stop knob are connected.

[0014] As a further improvement of the utility model, the start knob, the first contactor and the thermal relay on the second branch are connected in parallel to form a branch, and the branch is provided with a running signal light and a third contactor;

[0015] As a further improvement of the present invention, the stop button and the start button on the second branch are connected in parallel to a branch, and the branch is connected to a remote DCS.

[0016] As a further improvement of the present invention, a third branch is provided between the power connection and the neutral line of the three-phase AC power supply, the third branch is connected to a torque controller and a fault signal light, and the torque controller is connected to a torque sensor.

[0017] As a further improvement of the present invention, two ends of the torque controller are respectively connected to the RB and RC terminals of the frequency converter, and a connecting switch is provided between the RB and RC terminals.

[0018] As a further improvement of the utility model, a second intermediate relay is connected in parallel at both ends of the fault signal lamp.

[0019] The utility model also provides a scraper control box, comprising a box shell and a panel, and various circuit components in the scraper control circuit are installed in the box shell;

[0020] The panel is provided with a power signal light, an emergency stop button, a running signal light, a fault signal light, a start button, a stop button and an adjusting knob.

[0021] Compared with the prior art, the beneficial effects of the utility model are:

[0022] The scraper control circuit and control box of the utility model integrate various electrical control functions suitable for the operation of the scraper, including power distribution, control, protection, communication, external interface, operation, indication, etc. According to the process characteristics of the scraper, the main motor of the scraper adopts frequency converter control, and the main motor of the scraper adopts a special motor with variable frequency, which has an independent fan. The control box realizes the control of the main motor and fan motor of the scraper.

[0023] The utility model control circuit box uses the circuit breaker as the short circuit protection, ground fault protection and long delay backup protection of the motor; wherein the first circuit breaker QF1 and the second circuit breaker respectively realize the protection of the main motor of the scraper and the fan motor.

[0024] The main circuit of the control box of the utility model is equipped with a frequency converter for the main motor of the scraper, so that the influence of the voltage drop in the control box can be avoided during its startup, the impact on the moving parts of the scraper can be reduced during the startup, and the corresponding running speed can be set according to the specific conditions of the mud water in the pool and the process requirements. The frequency converter itself has multiple protection functions such as short circuit fault, overcurrent, overload, overtemperature, ground fault, overvoltage, undervoltage, and stall. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is the main circuit diagram of a mud scraper control box disclosed in one embodiment of the utility model;

[0026] Figure 2 The utility model discloses a control circuit diagram of a mud scraper control box in one embodiment.

[0027] Figure 3 The utility model discloses a knob and terminal wiring diagram of a mud scraper control box according to an embodiment of the utility model.

[0028] Figure 4 The utility model is a panel schematic diagram of a mud scraper control box disclosed in an embodiment.

[0029] Figure 5 The utility model discloses a material list of a control box for a mud scraper according to an embodiment of the utility model. DETAILED DESCRIPTION

[0030] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0031] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0033] The utility model is further described in detail below in conjunction with the accompanying drawings:

[0034] like Figure 1 As shown, the utility model provides a scraper control box circuit, including: a fan motor control circuit and a scraper main motor control circuit;

[0035] The fan motor control circuit includes a thermal relay, a first contactor, a second circuit breaker and a first circuit breaker connected to the fan motor in sequence, and the first circuit breaker is connected to a three-phase AC power supply; wherein the first circuit breaker and the second circuit breaker serve as circuit breaker protection devices for the main circuit, and the thermal relay serves as an overheat protection device for the fan motor to protect the fan motor from burning due to overheating. When the thermal relay of the fan motor is activated or the circuit breaker trips, an alarm signal is issued and the main motor of the scraper is stopped to prevent the main motor of the scraper from heating up and burning due to the fan stopping; the first contactor serves as a control device for the fan motor, and is used to connect and disconnect the power supply of the fan motor. Ensure that the fan motor and the main motor of the scraper are started and stopped at the same time to dissipate heat for the main motor of the scraper;

[0036] The control circuit of the scraper main motor includes a frequency converter connected to the scraper main motor, the frequency converter is connected to the first circuit breaker, and the first circuit breaker is connected to the three-phase AC power supply; the frequency converter serves as a transmission device for the scraper main motor, and the frequency converter can avoid the influence of voltage drop in the control box during the startup of the scraper main motor, reduce the impact on the moving parts of the scraper during the startup, and set the corresponding operating speed according to the specific conditions of the mud and water in the pool and the process requirements; and the frequency converter itself has multiple protection functions such as short circuit fault, overcurrent, overload, overtemperature, ground fault, overvoltage, undervoltage, and stall.

[0037] The RB and RC terminals of the inverter are connected to the torque controller, and the torque controller is connected to the torque sensor; the AI1 and GND terminals of the inverter are connected to the remote DCS to receive the remote frequency setting signal; the AO1 and GND terminals of the inverter are connected to the remote DCS to provide frequency feedback to the remote DCS; the second contactor is connected between the 24V terminal and the DI1 terminal of the inverter.

[0038] The inverter is equipped with a communication function, which is used as a communication method to connect with the outside, such as a remote DCS, and to communicate various inverter-related signals with the remote DCS in the form of communication.

[0039] Specifically, Figure 2 As shown:

[0040] The power terminal of the three-phase AC power supply is first connected to the fuse, and then connected to the fan motor control circuit and the main motor control circuit to achieve overheat protection of the scraper control box circuit.

[0041] A first branch is provided between the power terminal and the neutral line of the three-phase AC power supply, and a power signal light is connected to the first branch. The power signal light indicates the power supply, and the power connection status can be known.

[0042] A second branch is provided between the power connection and the neutral line of the three-phase AC power supply, and an emergency stop button, a first intermediate relay and an adjusting knob are provided on the second branch in sequence, and a stop button, a start button, a first contactor and a thermal relay are provided behind the adjusting knob, and the thermal relay is connected to the neutral line;

[0043] The stop button is closed in the initial state, the start button is disconnected in the initial state, and the adjustment knob is not connected to the circuit in the initial state. After adjustment, the first intermediate relay and the stop knob are connected.

[0044] The start knob, the first contactor and the thermal relay on the second branch are connected in parallel to a branch, on which a running signal light and a third contactor are provided;

[0045] The stop button and the start button on the second branch are connected in parallel to another branch, which is connected to the remote DCS.

[0046] A third branch is provided between the power connection and the neutral line of the three-phase AC power supply, the third branch is connected with a torque controller and a fault signal lamp, and the torque controller is connected with a torque sensor.

[0047] The two ends of the torque controller are respectively connected to the RB and RC terminals of the frequency converter, and a connection switch is arranged between the RB and RC terminals.

[0048] The second intermediate relay is connected in parallel at both ends of the fault signal lamp.

[0049] The fan motor and the main motor of the scraper are both equipped with grounding wires and are grounded.

[0050] like Figure 4 As shown, the present invention also provides a scraper control box, including a box shell and a panel, and each circuit component in the scraper control circuit is installed in the box shell;

[0051] The panel is equipped with a power signal light, an emergency stop button, an operation signal light, a fault signal light, a start button, a stop button and an adjustment knob. The buttons and knobs are used to control the scraper; the signal lights are used to indicate the relevant status of the scraper.

[0052] in,

[0053] The control box panel is equipped with a series of wiring terminals, which serve as signal nodes connected to the outside. They can send the scraper's signals to the remote control DCS, and can also receive control signals from the remote DCS, such as remote control signals, operation signals, stop signals, inverter faults, fan faults, start control, stop control, etc.

[0054] like Figure 3 As shown, the adjustment button can realize three state adjustments, including local, remote and stop;

[0055] The panel is equipped with multiple buttons and indicator lights for starting and stopping the scraper, as well as power indication and operation indication. An emergency stop button is set to stop the scraper in an emergency. A local / remote conversion knob is set to select local control and remote control.

[0056] Furthermore,

[0057] The control box is equipped with various alarm indication functions, including scraper torque over-limit, inverter failure, thermal relay alarm, etc. An alarm interlocking shutdown function is also set to protect the scraper from damage in the event of a fault.

[0058] The first circuit breaker realizes the circuit breaking protection of the fan motor control circuit and the scraper main motor control circuit;

[0059] The frequency converter realizes the power supply frequency and voltage from the three-phase AC power supply, and then transmits it to the main motor of the scraper to control the speed of the main motor of the scraper;

[0060] Furthermore,

[0061] The frequency converter can receive the frequency setting value input by the remote DCS, adjust the power supply frequency and voltage according to the frequency setting value, and transmit the adjusted power supply frequency and voltage to the main motor of the scraper to control the speed of the scraper station.

[0062] The frequency converter can feed back the current frequency of the frequency converter to the remote DCS, so that the remote DCS can know the current working status of the main motor of the scraper.

[0063] like Figure 5 As shown, the codes, names, specifications and quantities of various components required in the circuit of the scraper control box of the utility model are listed, and the torque sensor is installed outside the scraper control box.

[0064] Example:

[0065] like Figure 1 , 2 As shown in Figure 4, this scraper control box has two operating modes:

[0066] The first type: the control knob on the control box panel is in the local position, press the manual start button, then the main motor and fan motor of the scraper start to run, when the torque of the scraper is too large, the torque switch will be activated and stop automatically. At this time, press the manual stop button and the scraper stops running.

[0067] This method is mainly used in the commissioning and maintenance stages of the scraper.

[0068] The second method: When the control knob on the control box panel is in the remote position, the operation and stop of the scraper are controlled by a remote control system such as a remote DCS. This method is suitable for the long-term automatic operation of the scraper in large and medium-sized projects connected to the DCS.

[0069] Advantages of the utility model:

[0070] The scraper control circuit and control box of the utility model integrate various electrical control functions suitable for the operation of the scraper, including power distribution, control, protection, communication, external interface, operation, indication, etc. According to the process characteristics of the scraper, the main motor of the scraper adopts frequency converter control, and the main motor of the scraper adopts a special motor with variable frequency, which has an independent fan. The control box realizes the control of the main motor and fan motor of the scraper.

[0071] The utility model control circuit box uses the circuit breaker as the short circuit protection, ground fault protection and long delay backup protection of the motor; wherein the first circuit breaker QF1 and the second circuit breaker respectively realize the protection of the main motor of the scraper and the fan motor.

[0072] The main circuit of the control box of the utility model is equipped with a frequency converter for the main motor of the scraper, so that the influence of the voltage drop in the control box can be avoided during its startup, the impact on the moving parts of the scraper can be reduced during the startup, and the corresponding running speed can be set according to the specific conditions of the mud water in the pool and the process requirements. The frequency converter itself has multiple protection functions such as short circuit fault, overcurrent, overload, overtemperature, ground fault, overvoltage, undervoltage, and stall.

[0073] The above are only preferred embodiments of the present invention and do not limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A scraper control box circuit, characterized in that: include: Fan motor control circuit and scraper main motor control circuit; The fan motor control circuit comprises a thermal relay, a first contactor, a second circuit breaker and a first circuit breaker connected to the fan motor in sequence, wherein the first circuit breaker is connected to a three-phase AC power supply; The main motor control circuit of the scraper includes a frequency converter connected to the main motor of the scraper, the frequency converter is connected to a first circuit breaker, and the first circuit breaker is connected to a three-phase AC power supply; The RB and RC terminals of the frequency converter are connected to the torque controller, and the torque controller is connected to the torque sensor; the AI1 and GND terminals of the frequency converter are connected to the remote DCS to receive the remote frequency setting signal; the AO1 and GND terminals of the frequency converter are connected to the remote DCS to provide frequency feedback to the remote DCS; a second contactor is connected between the 24V terminal and the DI1 terminal of the frequency converter.

2. The scraper control box circuit according to claim 1 is characterized in that: The power connection terminal of the three-phase AC power supply is first connected to a fuse, and then connected to a fan motor control circuit and the main motor control circuit.

3. The scraper control box circuit according to claim 1 is characterized in that: A first branch is provided between the power connection terminal of the three-phase AC power supply and the neutral line, and a power signal lamp is connected to the first branch.

4. The scraper control box circuit according to claim 1 is characterized in that: A second branch is provided between the power connection of the three-phase AC power supply and the neutral line, and an emergency stop button, a first intermediate relay and an adjusting knob are provided on the second branch in sequence, and a stop button, a start button, a first contactor and a thermal relay are provided behind the adjusting knob, and the thermal relay is connected to the neutral line; The stop button is closed in the initial state, the start button is disconnected in the initial state, and the adjustment knob is not connected to the circuit in the initial state. After adjustment, the first intermediate relay and the stop knob are connected.

5. The scraper control box circuit according to claim 4 is characterized in that: The starting knob, the first contactor and the thermal relay on the second branch are connected in parallel to a branch, and a running signal light and a third contactor are arranged on the branch.

6. The scraper control box circuit according to claim 4 is characterized in that: The stop button and the start button on the second branch are connected in parallel to a branch, and the branch is connected to a remote DCS.

7. The scraper control box circuit according to claim 1 is characterized in that: A third branch is provided between the power connection and the neutral line of the three-phase AC power supply, and a torque controller and a fault signal light are connected to the third branch. The torque controller is connected to a torque sensor.

8. The scraper control box circuit according to claim 1 is characterized in that: The two ends of the torque controller are connected to the RB and RC terminals of the frequency converter respectively, and a connecting switch is arranged between the RB and RC terminals.

9. The scraper control box circuit according to claim 7, characterized in that: The two ends of the fault signal lamp are connected in parallel with a second intermediate relay.

10. A scraper control box, using the scraper control box circuit according to any one of claims 1 to 9, characterized in that: It includes a box shell and a panel, and each circuit component in the scraper control box circuit is installed in the box shell; The panel is provided with a power signal light, an emergency stop button, a running signal light, a fault signal light, a start button, a stop button and an adjusting knob.

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