Quick switching system for electrical control unit of Isa spray gun

Abstract

The utility model discloses a quick switching system for an electrical control unit of an Isa spray gun. A frequency conversion control branch comprises a main frequency conversion control branch and a standby frequency conversion control branch, the main variable-frequency control branch is connected in parallel with the standby variable-frequency control branch for supplying power to the variable-frequency motor; the two sets of Isa spray gun electrical control loop units are used for controlling the same spray gun, the mode that the Isa spray gun is controlled through a single electrical control loop is replaced, and when one set of spray gun control loop unit breaks down, the other set of spray gun control loop unit can be rapidly switched. Production halt caused by faults of the spray gun control unit is greatly shortened, the production efficiency of an enterprise is effectively improved, stable operation and uninterrupted production of a production control system of the enterprise are ensured, and the production cost is reduced; a novel solution for rapid switching of the electrical control unit of the Isa spray gun is provided for production enterprises with unstable power supply and poor field environment.

Description

TECHNICAL FIELD

[0001] The utility model relates to non ferrous metal smelting equipment control technical field, concretely relates to a quick switching system of isa spray gun electrical control unit. BACKGROUND

[0002] In general production enterprises, the main electric circuit of isa furnace spray gun lifting control generally adopts single configuration, the power supply relies on emergency power supply (EPS), and the speed regulating unit selects the frequency converter, however, the production site of this kind of enterprise often faces extremely severe environmental conditions, a large amount of smoke and dust diffuse in it, so that the running environment of electrical equipment is relatively poor.

[0003] The main electric circuit of this single configuration has significant disadvantages, because the frequency converter of the speed regulating unit is exposed to the harsh environment for a long time, and is prone to failure, once the frequency converter fails, the spray gun will lose control instantaneously, which undoubtedly will pose a major threat to the safety of production process, and it is extremely likely to cause serious production accidents, and more troublesome is that when the frequency converter needs to be replaced, the entire related production system has to be stopped running, according to actual data statistics, it takes about three hours to complete the replacement of the frequency converter, during which the production activities of the enterprise are in a standstill, the product output is greatly reduced, and then the profit suffers great loss.

[0004] Based on the above serious situation, it is imminent to develop a novel spray gun control operation mode, which can not only effectively improve the safety in the production process and avoid major accidents caused by equipment failure, but also greatly reduce the influence of equipment failure on production and protect the stable production and economic benefits of enterprises. CONTENT OF THE UTILITY MODEL

[0005] The utility model aims at providing a quick switching system of isa spray gun electrical control unit to solve the technical problems mentioned in the background art.

[0006] To achieve the above object, the utility model adopts the technical scheme that:

[0007] A quick switching system of isa spray gun electrical control unit, comprising an EPS power supply, a power switch 1QF, a power main contactor 1KM, a frequency conversion motor and two frequency conversion control branches;

[0008] The EPS power supply, the power switch 1QF and the power main contactor 1KM are connected in series and then supply power to the frequency conversion motor through the two parallel frequency conversion control branches;

[0009] The frequency conversion control branch includes a main frequency conversion control branch and a standby frequency conversion control branch, and the main frequency conversion control branch and the standby frequency conversion control branch are connected in parallel and used for power supply of the frequency conversion motor;

[0010] In the main frequency converter control branch, the power switch 2QF of the first frequency converter is connected in series with the first frequency converter 1VSD;

[0011] In the standby frequency converter control branch, the power switch 3QF of the second frequency converter is connected in series with the second frequency converter 2VSD;

[0012] The input side of the first frequency converter 1VSD is connected to the output terminal of the main power contactor 1KM through the first frequency converter power switch 2QF, and the output side of the first frequency converter 1VSD is connected to the frequency converter motor; the input side of the second frequency converter 2VSD is connected to the output terminal of the main power contactor 1KM through the second frequency converter power switch 3QF, and the output side of the second frequency converter 2VSD is connected to the frequency converter motor.

[0013] It also includes intermediate control circuitry:

[0014] The intermediate control circuit includes a PLC and eight relays, each with eight coils, eight normally closed switches, and eight normally open switches.

[0015] Eight coils are connected in parallel and powered by 220V AC. The power supply for the eight coils is controlled by switch QF.

[0016] The eight signals are connected to the eight control terminals of the first frequency converter 1VSD through eight normally closed switches;

[0017] The eight signals are connected to the eight control terminals of the second frequency converter 2VSD through eight normally open contacts.

[0018] The 8 signals refer to: brake release signal, fast signal, slow signal, creep signal, lift signal, lower signal, start signal, and common signal;

[0019] It also includes the variable frequency motor fan control circuit:

[0020] The variable frequency motor fan circuit includes a fan switch 4QF, a fan AC contactor 2KM, and a variable frequency motor fan. One end of the fan switch 4QF is connected to the output terminal of the main power contactor 1KM, and the other end of the fan switch 4QF is connected to the input terminal of the fan AC contactor 2KM. The output terminal of the fan AC contactor 2KM is connected to the variable frequency motor fan.

[0021] It also includes the motor brake coil control circuit:

[0022] The motor brake coil circuit includes a brake switch 5QF, a brake AC contactor 3KM, and a motor brake coil; one end of the brake switch 5QF is connected to the output terminal of the main power contactor 1KM, the other end of the brake switch 5QF is connected to the input terminal of the brake AC contactor 3KM, and the output terminal of the brake AC contactor 3KM is connected to the motor brake coil.

[0023] The output side of the first frequency converter 1 (VSD) is connected to the frequency converter motor via the first terminal 1; the output side of the second frequency converter 2 (VSD) is connected to the frequency converter motor via the second terminal 2.

[0024] Beneficial effects:

[0025] This invention employs two sets of Isa spray gun electrical control circuit units to control the same spray gun, replacing the mode of controlling the Isa spray gun with a single electrical control circuit. When one set of spray gun control circuit units fails, it can quickly switch to the other set of spray gun control circuit units, greatly reducing production downtime caused by spray gun control unit failures, effectively improving enterprise production efficiency, ensuring stable operation of the enterprise's production control system, uninterrupted production, and reducing production costs. It provides a novel solution for rapid switching of Isa spray gun electrical control units for production enterprises with unstable power supply and poor on-site environment. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 Electrical schematic diagram of the Isa spray gun control unit;

[0028] Figure 2 This is the schematic diagram of the inverter control circuit.

[0029] Figure 3 This is the control principle diagram of the intermediate control circuit;

[0030] Figure 4 This is the control principle diagram of the first frequency converter 1VSD;

[0031] Figure 5 This is the control principle diagram of the second frequency converter 2VSD. Detailed Implementation

[0032] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0033] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0035] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0037] Example 1

[0038] like Figures 1 to 5 As shown, an Isa spray gun electrical control unit quick switching system includes an EPS power supply, a power switch 1QF, a power main contactor 1KM, a frequency converter motor, and two frequency converter control branches.

[0039] The EPS power supply, power switch 1QF and power main contactor 1KM are connected in series and then supply power to the variable frequency motor through two parallel variable frequency control branches.

[0040] The frequency converter control branch includes a main frequency converter control branch and a backup frequency converter control branch; the main frequency converter control branch and the backup frequency converter control branch are connected in parallel to supply power to the frequency converter motor;

[0041] In the main frequency converter control branch, the power switch 2QF of the first frequency converter is connected in series with the first frequency converter 1VSD;

[0042] In the standby frequency converter control branch, the power switch 3QF of the second frequency converter is connected in series with the second frequency converter 2VSD;

[0043] The input side of the first frequency converter 1VSD is connected to the output terminal of the main power contactor 1KM through the first frequency converter power switch 2QF, and the output side of the first frequency converter 1VSD is connected to the frequency converter motor; the input side of the second frequency converter 2VSD is connected to the output terminal of the main power contactor 1KM through the second frequency converter power switch 3QF, and the output side of the second frequency converter 2VSD is connected to the frequency converter motor.

[0044] It also includes intermediate control circuitry:

[0045] The intermediate control circuit includes a PLC and eight relays, each with eight coils, eight normally closed switches, and eight normally open switches.

[0046] Eight coils are connected in parallel and powered by 220V AC. The power supply for the eight coils is controlled by switch QF.

[0047] The eight signals are connected to the eight control terminals of the first frequency converter 1VSD through eight normally closed switches;

[0048] The eight signals are connected to the eight control terminals of the second frequency converter 2VSD through eight normally open contacts.

[0049] The 8 signals refer to: brake release signal, fast signal, slow signal, creep signal, lift signal, lower signal, start signal, and common signal;

[0050] It also includes the variable frequency motor fan control circuit:

[0051] The variable frequency motor fan circuit includes a fan switch 4QF, a fan AC contactor 2KM, and a variable frequency motor fan. One end of the fan switch 4QF is connected to the output terminal of the main power contactor 1KM, and the other end of the fan switch 4QF is connected to the input terminal of the fan AC contactor 2KM. The output terminal of the fan AC contactor 2KM is connected to the variable frequency motor fan.

[0052] It also includes the motor brake coil control circuit:

[0053] The motor brake coil circuit includes a brake switch 5QF, a brake AC contactor 3KM, and a motor brake coil; one end of the brake switch 5QF is connected to the output terminal of the main power contactor 1KM, the other end of the brake switch 5QF is connected to the input terminal of the brake AC contactor 3KM, and the output terminal of the brake AC contactor 3KM is connected to the motor brake coil.

[0054] The first frequency converter 1 VSD output side is connected to the frequency converter motor through the first terminal 1; the second frequency converter 2 VSD output end is connected to the frequency converter motor through the second terminal 2.

[0055] When the system is working normally, the first inverter 1VSD is operational. At this time, power switch 1QF, fan switch 4QF, brake switch 5QF, and the first inverter power switch 2QF are in the closed state, while the second inverter power switch 3QF is in the open state. The intermediate control circuit power supply switch QF is also in the open state. When the power start button SB2 is pressed, the main power contactor 1KM and the fan AC contactor 2KM are energized and self-locked through the auxiliary contact of the main power contactor 1KM. The inverter motor fan starts operating. Power from the EPS is input to the first inverter 1VSD via power switch 1QF, main power contactor 1KM, and the first inverter power switch 2QF, and then output to the inverter motor via the first inverter 1VSD. In the intermediate control circuit, intermediate relays KA1-KA8 are not operational because the power supply switch QF is in the open state. Therefore, the PLC outputs the brake release signal (P-DO-3) and the fast signal... The following signals are connected to the corresponding control terminals of the first frequency converter 1VSD via the normally closed auxiliary contacts of intermediate relays KA1-KA8: B-DO-4 (slow signal), P-DO-5 (slow signal), P-DO-6 (creep signal), P-DO-7 (lift signal), P-DO-8 (lower signal), and KT (start signal). When the frequency converter is fault-free, the output contact of intermediate relay K10 closes and the auxiliary contact of intermediate relay K10 closes. When the PLC outputs the lift or lower signal P-DO-7 or P-DO-8, the auxiliary contact of intermediate relay K9 closes, and the frequency converter start time relay KT works. After a delay, the contact of time relay KT closes and starts the first frequency converter 1VSD through the normally closed contact KA7 of intermediate relay, realizing the control operation of the first frequency converter 1VSD by the PLC. The operator can normally control and operate the first frequency converter 1VSD and the motor brake coil through the host computer.

[0056] When the first inverter 1VSD malfunctions and cannot operate normally or requires maintenance, disconnect the power switch 2QF of the first inverter, and disconnect the three inverter motor cables from the first terminal 1 of the first inverter 1VSD. Connect these cables to the second terminal 2 of the second inverter 2VSD according to the corresponding phase sequence. Then, close the power switch 3QF of the second inverter and the power supply switch QF of the intermediate control circuit. At this time, the intermediate relays K1-KA8 of the intermediate control circuit will operate, and the PLC will output a brake release signal.

[0057] (P-DO-3), fast signal (P-DO-4), slow signal (P-DO-5), creep signal (P-DO-6), lift signal (P-DO-7), fall signal (P-DO-8), start signal (KT), and common signal are connected to the corresponding control terminals of the second inverter 2VSD through the normally open auxiliary contacts of intermediate relays KA1-KA8. When the inverter is fault-free, the output contact B-DO-1* closes and the working auxiliary contact of intermediate relay K10 closes. When the PLC outputs lift or fall signals P-DO-7 and P-DO-8, the working auxiliary contact of intermediate relay K9 closes, the inverter start time relay KT works, and after a delay, the time relay KT contact closes and starts the second inverter 2VSD through the closed contact KA7 of the intermediate relay, realizing the switching from the operation of the first inverter 1VSD to the operation of the second inverter 2VSD. The operator can normally control and operate the second inverter 2VSD and the motor brake coil through the host computer.

[0058] Example 2

[0059] Similarly, to switch the second inverter 2VSD to the first inverter 1VSD, disconnect the power switch 3QF of the second inverter, remove the three inverter motor cables from the second terminal 2 of the second inverter 2VSD, and connect them to the first terminal 1 of the first inverter 1VSD according to the corresponding phase sequence. Disconnect the power switch QF of the intermediate control circuit, the intermediate relays KA1-KA8 will not work, the corresponding normally closed contacts will be closed, the control signal will be switched to the corresponding control terminal of the first inverter 1VSD, and the power switch 2QF of the first inverter will be closed. Through the above steps, the switching from the second inverter 2VSD to the first inverter 1VSD can be achieved. The operator can then operate the first inverter 1VSD and the motor brake normally through the host computer.

[0060] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0061] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The above examples are only used to help understand the method and core ideas of this utility model.

[0062] The above are merely preferred embodiments of this utility model. It should be noted that, due to the limitations of written expression, and the existence of an infinite number of specific structures, those skilled in the art can make several improvements, modifications, or variations without departing from the principle of this utility model, and can also combine the above-mentioned technical features in an appropriate manner. These improvements, modifications, variations, or combinations, or the direct application of the concept and technical solution of the utility model to other occasions without modification, should all be considered as protection of this utility model.

Claims

1. A rapid switching system for the electrical control unit of an Isa spray gun, characterized in that, Includes EPS power supply, power switch 1QF, main power contactor 1KM, variable frequency motor and two variable frequency control branches; The EPS power supply, power switch 1QF and power main contactor 1KM are connected in series and then supply power to the variable frequency motor through two parallel variable frequency control branches. The frequency conversion control branch includes a main frequency conversion control branch and a backup frequency conversion control branch; the main frequency conversion control branch and the backup frequency conversion control branch are connected in parallel for power supply to the frequency conversion motor; In the main frequency converter control branch, the first frequency converter power switch 2QF is connected in series with the first frequency converter 1VSD. In the backup frequency converter control branch, the second frequency converter power switch 3QF is connected in series with the second frequency converter 2VSD; The input side of the first frequency converter 1VSD is connected to the output terminal of the main power contactor 1KM through the first frequency converter power switch 2QF, and the output side of the first frequency converter 1VSD is connected to the frequency converter motor; the input side of the second frequency converter 2VSD is connected to the output terminal of the main power contactor 1KM through the second frequency converter power switch 3QF, and the output side of the second frequency converter 2VSD is connected to the frequency converter motor.

2. The rapid switching system for the electrical control unit of the Isa spray gun according to claim 1, characterized in that, It also includes intermediate control circuitry: The intermediate control circuit includes a PLC and eight relays, each with eight coils, eight normally closed switches, and eight normally open switches. Eight coils are connected in parallel and powered by 220V AC. The power supply for the eight coils is controlled by switch QF. The eight signals are connected to the eight control terminals of the first frequency converter 1VSD through eight normally closed switches; The eight signals are connected to the eight control terminals of the second frequency converter 2VSD through eight normally open contacts.

3. The rapid switching system for the electrical control unit of the Isa spray gun according to claim 1, characterized in that, The 8 signals refer to: brake release signal, fast signal, slow signal, creep signal, lift signal, descent signal, start signal, and common signal.

4. The rapid switching system for the electrical control unit of the Isa spray gun according to claim 1, characterized in that, It also includes a variable frequency motor fan control circuit: the variable frequency motor fan circuit includes a fan switch 4QF, a fan AC contactor 2KM and a variable frequency motor fan. One end of the fan switch 4QF is connected to the output terminal of the main power contactor 1KM, and the other end of the fan switch 4QF is connected to the input terminal of the fan AC contactor 2KM. The output terminal of the fan AC contactor 2KM is connected to the variable frequency motor fan.

5. The rapid switching system for the electrical control unit of the Isa spray gun according to claim 1, characterized in that, It also includes a motor brake coil control circuit: the motor brake coil circuit includes a brake switch 5QF, a brake AC contactor 3KM, and a motor brake coil; one end of the brake switch 5QF is connected to the output terminal of the main power contactor 1KM, the other end of the brake switch 5QF is connected to the input terminal of the brake AC contactor 3KM, and the output terminal of the brake AC contactor 3KM is connected to the motor brake coil.

6. The rapid switching system for the electrical control unit of the Isa spray gun according to claim 1, characterized in that, The output side of the first frequency converter 1 (VSD) is connected to the frequency converter motor via the first terminal 1; the output side of the second frequency converter 2 (VSD) is connected to the frequency converter motor via the second terminal 2.

Images