Non-stop intelligent control circuit

Abstract

A non-stop intelligent control circuit comprises a PLC control system, the input end of the PLC control system is connected with a PLC control loop, the output end of the PLC control system is connected with at least one frequency converter through a PN communication circuit, and the input end of the frequency converter is further provided with a network signal interface and at least one control signal interface, the network signal interface is in communication connection with the PLC control system; a control signal interface connected with the input end of the frequency converter comprises a communication switching terminal, a reset switch terminal, a motor reverse rotation control terminal and a motor forward rotation control terminal; the reset switch terminal is connected with the reset button, the motor reverse rotation control terminal is connected with the motor reverse rotation button, and the motor forward rotation control terminal is connected with the motor forward rotation button. According to the utility model, the non-stop and reliable work of the crane can be realized, the condition that the crane is shut down for maintenance when the crane breaks down is effectively reduced, and the risk that the efficiency and the construction period are delayed due to shut down for maintenance under special working conditions is reduced.

Description

Technical Field

[0001] The utility model relates to a non-stop intelligent control circuit. Background Art

[0002] With the development of automated and intelligent factories, factory production lines have higher and higher requirements for the safety and efficiency of cranes. How to effectively improve the safety and operating efficiency of cranes is the direction of industry development.

[0003] Conventional cranes have a single control circuit system. Once a control circuit failure occurs, the crane will stop working. If it is not repaired in time by professionals, it will remain in a shutdown state, greatly reducing the crane's work efficiency. In more serious cases, it will cause deformation and damage to the hoisted objects. There are huge hidden dangers in the safe and reliable operation of the crane. Utility Model Content

[0004] The technical problem to be solved by the utility model is: how to improve the safe and reliable operation of the crane and realize the reliable operation of the crane without stopping, so a non-stop intelligent control circuit is provided.

[0005] In order to achieve the above object, the utility model is realized by the following technical solutions:

[0006] A non-stop intelligent control circuit includes a PLC control system, wherein the input end of the PLC control system is connected to a PLC control loop, the output end of the PLC control system is connected to at least one frequency converter via a PN communication circuit, and a network signal interface and at least one control signal interface are also provided at the input end of the frequency converter, wherein the network signal interface is communicatively connected to the PLC control system;

[0007] The PLC control circuit includes a grab opening control circuit, a grab closing control circuit, an alarm control circuit, a grab raising control circuit, a grab lowering control circuit, a trolley forward control circuit and a trolley backward control circuit connected in parallel;

[0008] The grab bucket opening control circuit includes a grab bucket opening contactor and a grab bucket opening normally open switch connected thereto;

[0009] The grab bucket closing control circuit includes a grab bucket closing contactor and a grab bucket closing normally open switch connected thereto;

[0010] The alarm control circuit includes an alarm contactor and an alarm normally open switch connected thereto;

[0011] The grab bucket lifting control circuit includes a grab bucket lifting contactor and a grab bucket lifting normally open switch connected thereto;

[0012] The grab bucket lowering control circuit includes a grab bucket lowering contactor and a grab bucket lowering normally open switch connected thereto;

[0013] The trolley forward control circuit includes a trolley forward contactor and a trolley forward normally open switch connected thereto;

[0014] The trolley retreat control circuit includes a trolley retreat contactor and a trolley retreat normally open switch connected thereto;

[0015] The control signal interface connected to the input end of the frequency converter includes a communication switching terminal, a reset switch terminal, a motor reverse control terminal and a motor forward control terminal; the reset switch terminal is connected to the reset button, the motor reverse control terminal is connected to the motor reverse button, and the motor forward control terminal is connected to the motor forward button.

[0016] Compared with the prior art, the utility model has the following beneficial effects: an intelligent control circuit is applied to a crane without stopping, which can realize the reliable operation of the crane without stopping, effectively reduce the situation of the crane being shut down for maintenance when a fault occurs, reduce the risk of shutdown for maintenance and delay in efficiency and construction period under special working conditions, and improve the safety and work efficiency of the crane operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the PN communication diagram between PLC and inverter;

[0018] Figure 2 It is the PLC control loop diagram;

[0019] Figure 3 This is the inverter circuit diagram;

[0020] Figure 4 To control the switching and alarm circuit diagram;

[0021] Figure 5 This is the terminal control circuit diagram. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0024] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, a non-stop intelligent control circuit includes a PLC control system, wherein the input end of the PLC control system is connected to a PLC control loop, the output end of the PLC control system is connected to at least one frequency converter via a PN communication circuit, and a network signal interface RJ45 and at least one control signal interface are also provided at the input end of the frequency converter, wherein the network signal interface RJ45 is communicatively connected to the PLC control system.

[0025] like Figure 2 , Figure 5 As shown, the PLC control circuit includes a grab opening control circuit, a grab closing control circuit, an alarm control circuit, a grab raising control circuit, a grab lowering control circuit, a trolley forward control circuit and a trolley backward control circuit connected in parallel.

[0026] The grab bucket opening control circuit includes the grab bucket opening contactor CH3 and the grab bucket opening normally open switch R11S connected thereto; the worker operates the grab bucket second working button LK2, the grab bucket second working button LK2 connects to the grab bucket opening contactor CH3, the grab bucket opening contactor CH3 is energized, and its grab bucket opening normally open switch R11S is closed, the control circuit is turned on, and the PLC control system obtains the signal. It should be noted that the normally open switch K014 connected to the grab bucket opening contactor CH3 is a signal switch, and under normal working conditions, the switch is in a closed state.

[0027] The grab bucket closing control circuit includes a grab bucket closing contactor CH4 and a grab bucket closing normally open switch R21S connected thereto; the staff operates the grab bucket second working button LK2, the grab bucket second working button LK2 is connected to the grab bucket closing contactor CH4, the grab bucket closing contactor CH4 is energized, and its grab bucket closing normally open switch R21S is closed, the control circuit is turned on, and the PLC control system obtains the signal.

[0028] The grab bucket lifting control circuit includes a grab bucket lifting contactor CH6 and a grab bucket lifting normally open switch R31S connected thereto; the staff operates the grab bucket first working button LK1, the grab bucket first working button LK1 is connected to the grab bucket lifting contactor CH6, the grab bucket lifting contactor CH6 is energized, and its grab bucket lifting normally open switch R31S is closed, the control circuit is turned on, and the PLC control system obtains the signal.

[0029] The grab bucket lowering control circuit includes a grab bucket lowering contactor CH7 and a grab bucket lowering normally open switch R41S connected thereto; the staff operates the grab bucket first working button LK1, the grab bucket first working button LK1 is connected to the grab bucket lowering contactor CH7, the grab bucket lowering contactor CH7 is energized, and its grab bucket lowering normally open switch R41S is closed, the control circuit is turned on, and the PLC control system obtains the signal.

[0030] It should be noted that the second working button LK2 of the grab bucket is a single-pole three-throw switch, the first position is the grab bucket open, the second position is the grab bucket closed, and the third position is the grab bucket fast opening and closing position. The first working button LK1 of the grab bucket is also a single-pole three-throw switch, the first position is the grab bucket rising, the second position is the grab bucket falling, and the third position is the grab bucket high-speed lifting position.

[0031] The trolley forward control circuit includes a trolley forward contactor CH12 and a trolley forward normally open switch EAST connected thereto; the staff operates the trolley control button LK3, the trolley control button LK3 is connected to the trolley forward contactor CH12, the trolley forward contactor CH12 is energized, and its trolley forward normally open switch EAST is closed, the control circuit is turned on, and the PLC control system obtains the signal.

[0032] The trolley reverse control circuit includes the trolley reverse contactor CH13 and the trolley reverse normally open switch WEST connected thereto. When the staff operates the trolley control button LK3, the trolley control button LK3 is connected to the trolley reverse contactor CH13, the trolley reverse contactor CH13 is energized, and its trolley reverse normally open switch WEST is closed, the control circuit is turned on, and the PLC control system obtains the signal.

[0033] The alarm control circuit includes an alarm contactor CH1 and an alarm normally open switch R0 connected thereto.

[0034] Furthermore, if Figure 1 As shown, the output end of the PLC control system is connected to the grab support lifting inverter 07-U30, the grab opening and closing inverter 07-U31, the trolley inverter 10-U30, the trolley driven side inverter 12-U31, the trolley active side inverter 12-U30 and the auxiliary lifting inverter 06-U30 through the PN communication circuit A10.

[0035] like Figure 3 As shown, the input end of each of the above-mentioned inverters is provided with a network signal interface RJ45 and at least one control signal interface, wherein the control signal interface includes a communication switching terminal, a reset switch terminal, a motor reverse control terminal and a motor forward control terminal; the reset switch terminal is connected to the reset button K012, the motor reverse control terminal is connected to the motor reverse button K025, and the motor forward control terminal is connected to the motor forward button K024.

[0036] like Figure 4 The control switching and alarm circuit diagram shown includes an alarm button SB11 and an emergency stop button S11, wherein the alarm button SB11 is connected to the alarm contactor CHSB11, and the emergency stop button S11 is connected to the emergency stop contactor CHS11.

[0037] The working principle of the utility model is:

[0038] When the crane is working normally, the first control system with PLC is used. The PLC control system is connected to the inverter through PN communication and uses a network cable to transmit signals. When the system fails for some reason, there is no network signal input from the PLC control system at the input end of the inverter. When the inverter detects that there is no output signal from the PLC program, it will issue an alarm signal and automatically switch to terminal control through the PLC program or manually switch to terminal control on the operating console.

[0039] In this way, the non-stop intelligent control circuit of the crane contains two different types of control circuits, one of which uses PLC and inverter communication control, and the other uses contactor and terminal control. When the crane is working normally, the first control system with PLC is used. This system uses PN communication and uses network cables to connect and transmit signals. When the system fails for some reason, it will send out an alarm signal by detecting that the PLC program has no output signal, and automatically switch to terminal control through the PLC program or manually switch to terminal control on the operating console.

[0040] The utility model can be applied to a variety of crane working conditions and industries, improve the reliability of the power supply system, and realize the non-stop operation of the equipment. It can realize the reliable control function of the crane without stopping, reduce the situation that the crane stops working once a single control circuit system fails, greatly improve the working efficiency of the crane, and improve the safety of the crane operation. The control system structure of the utility model is relatively simple to implement and the cost is low.

[0041] The above is only a preferred embodiment of the present invention. It should be pointed out that those skilled in the art can make several changes and improvements without departing from the overall concept of the present invention, and these should also be regarded as the protection scope of the present invention.

Claims

1. A non-stop intelligent control circuit, characterized in that: It includes a PLC control system, wherein the input end of the PLC control system is connected to a PLC control loop, the output end of the PLC control system is connected to at least one frequency converter via a PN communication circuit, and a network signal interface (RJ45) and at least one control signal interface are also provided at the input end of the frequency converter, wherein the network signal interface (RJ45) is communicatively connected to the PLC control system; The PLC control circuit includes a grab opening control circuit, a grab closing control circuit, an alarm control circuit, a grab raising control circuit, a grab lowering control circuit, a trolley forward control circuit and a trolley backward control circuit connected in parallel; The control signal interface connected to the input end of the frequency converter includes a communication switching terminal, a reset switch terminal, a motor reverse control terminal and a motor forward control terminal; the reset switch terminal is connected to a reset button (K012), the motor reverse control terminal is connected to a motor reverse button (K025), and the motor forward control terminal is connected to a motor forward button (K024).

2. The non-stop intelligent control circuit according to claim 1, characterized in that: The grab bucket opening control circuit includes a grab bucket opening contactor (CH3) and a grab bucket opening normally open switch (R11S) connected thereto; The grab bucket closing control circuit includes a grab bucket closing contactor (CH4) and a grab bucket closing normally open switch (R21S) connected thereto; The alarm control circuit includes an alarm contactor (CH1) and an alarm normally open switch (R0) connected thereto; The grab bucket lifting control circuit includes a grab bucket lifting contactor (CH6) and a grab bucket lifting normally open switch (R31S) connected thereto; The grab bucket lowering control circuit includes a grab bucket lowering contactor (CH7) and a grab bucket lowering normally open switch (R41S) connected thereto; The trolley forward control circuit includes a trolley forward contactor (CH12) and a trolley forward normally open switch (EAST) connected thereto; The trolley reverse control circuit includes a trolley reverse contactor (CH13) and a trolley reverse normally open switch (WEST) connected thereto.

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