Device for rapidly switching PLC (Programmable Logic Controller) power supply of crane

Abstract

The utility model relates to a crane quick switching PLC power supply device, which is characterized in that the input end of a first control loop and the input end of a second control loop are connected with the output end of a first circuit breaker, the output end of the first control loop and the output end of the second control loop are connected with a PLC unit, the input end of the first circuit breaker is connected with an alternating current power supply, and the output end of the second circuit breaker is connected with an alternating current power supply; the first control loop comprises a second circuit breaker and a first normally-closed auxiliary contact of the contactor which are connected in series, the second control loop comprises a voltage-stabilized source and a normally-open main contact of the contactor which are connected in series, and a first control branch is connected between the voltage-stabilized source and the normally-open main contact of the contactor in parallel. The device has the advantages that the normally open auxiliary contact of the power supply detection contactor K1 is connected with the digital quantity input module, the CPU is connected with the communication module, and the communication module is connected with the touch screen through the port, so that an operator can conveniently check the operation state of the voltage-stabilized power supply at any time through the touch screen, the structure is simple, and the maintenance is convenient.

Description

Technical Field

[0001] The present application relates to the field of lifting equipment, and in particular to a crane fast switching PLC power supply device. Background Art

[0002] Bridge cranes are lifting equipment installed above workshops, warehouses and material yards for lifting materials. They are the most widely used and most numerous lifting machinery. The speed of the trolley and carriage of the bridge crane is adjusted through PLC. Usually, a voltage-stabilized power supply is installed at the power input end of the PLC to provide a stable input power supply to the PLC. However, in actual work, it often happens that if the voltage-stabilized power supply fails, the bridge crane cannot operate, affecting the smooth production. Utility Model Content

[0003] The purpose of the present application is to provide a crane fast switching PLC power supply device, which solves the problem that the bridge crane cannot operate due to the failure of the voltage-stabilized power supply and maintains the PLC power supply.

[0004] To achieve the above objectives, this application is implemented through the following technical solutions:

[0005] A crane fast switching PLC power supply device comprises a control circuit 1 and a control circuit 2, wherein the input end of the control circuit 1 and the input end of the control circuit 2 are both connected to the output end of the circuit breaker 1, the output end of the control circuit 1 and the output end of the control circuit 2 are both connected to the PLC unit, the input end of the circuit breaker 1 is connected to an AC power supply, the control circuit 1 comprises a circuit breaker 2 connected in series and a normally closed auxiliary contact 1 of a contactor, the control circuit 2 comprises a voltage-stabilizing power supply connected in series and a normally open main contact of the contactor, and a control branch 1 is connected in parallel between the voltage-stabilizing power supply and the normally open main contact of the contactor.

[0006] Control branch 1 includes the coil of the contactor.

[0007] Control circuit 2 also includes control branch 2, which is connected in parallel between the output end of circuit breaker 1 and the input end of the voltage-stabilized power supply. Control branch 2 includes a coil of a relay connected in series and a normally closed auxiliary contact 2 of the contactor, and the coil of the relay is connected in parallel with the sound and light alarm.

[0008] The PLC unit includes a power supply module. The output end of control loop one and the output end of control loop two are both connected to the input end of the power supply module. The output end of the power supply module is used to provide a DC working power supply.

[0009] The PLC unit also includes a digital quantity input module, which is respectively connected to the normally open auxiliary contacts of the contactor and the normally open contacts of the relay through ports.

[0010] The PLC unit also includes a CPU, a wireless communication module, a communication module, a power module, a digital input module, and a digital output module connected through ports, and the wireless communication module is connected to the CPU.

[0011] The wireless communication module uploads the CPU data information to the cloud server through the wireless transmission network. The cloud server saves the data information to the cloud management center through communication. The cloud management center connects to the mobile device through communication. The APP of the mobile device downloads the information of the cloud management center and uploads the feedback information to the cloud management center. The feedback information is then transmitted to the CPU module.

[0012] The PLC unit also includes a touch screen, and the communication module is connected to the touch screen through a port.

[0013] Compared with the prior art, the beneficial effects of this application are:

[0014] 1. The normally open auxiliary contact of the power detection contactor K1 is connected to the digital input module, the CPU is connected to the communication module, and the communication module is connected to the touch screen through the port, so that the operator can check the operating status of the voltage-stabilized power supply at any time through the touch screen. The structure is simple and easy to maintain;

[0015] 2. Upload the alarm information of the sound and light alarm to the cloud server through the relay KA, and then upload it to the cloud management center through the cloud server to realize real-time monitoring of the voltage-stabilized power supply, making full use of the resources of the cloud management center to save monitoring costs;

[0016] 3. Control circuit 1 is used as a backup circuit. The normally closed auxiliary contact 1 of the power detection contactor K1 can switch control circuit 2 to control circuit 1. The structure is simple and easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the principle of the crane's fast switching PLC power supply device.

[0018] Figure 2 It is a schematic diagram of the principle of the PLC unit.

[0019] In the figure: Q1-circuit breaker Q2-circuit breaker K1-contactor D1-sound and light alarm. DETAILED DESCRIPTION

[0020] The present application is described in detail below in conjunction with the accompanying drawings of the specification, but it should be noted that the implementation of the present application is not limited to the following implementation modes.

[0021] The following examples are implemented on the premise of the technical solution of the present application, and provide detailed implementation methods and specific operation processes, but the protection scope of the present application is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.

[0022] Embodiment 1:

[0023] See Figure 1 A crane fast switching PLC power supply device includes a control circuit 1 and a control circuit 2. The input end of the control circuit 1 and the input end of the control circuit 2 are both connected to the output end of the circuit breaker Q1. The PLC unit includes a power module. The output end of the control circuit 1 and the output end of the control circuit 2 are both connected to the input end AC220V of the power module. The output end of the power module is used to provide a DC working power supply DC24V. See attached Figure 2 The input end of the circuit breaker Q1 is connected to the AC transformer, the control circuit 1 includes the power switching circuit breaker Q2 and the normally closed auxiliary contact 1 of the power detection contactor K1 connected in series, the control circuit 2 includes the relay KA and the normally open main contacts of the voltage-stabilized power supply and the power detection contactor K1 connected in series, and the coil of the power detection contactor K1 is connected in parallel between the voltage-stabilized power supply and the normally open main contacts of the power detection contactor K1; the coil of the relay KA is connected in parallel between the output end of the circuit breaker Q1 and the input end of the voltage-stabilized power supply, the coil of the relay KA is connected in series with the normally closed auxiliary contact 2 of the power detection contactor K1, and the coil of the relay KA is also connected in parallel with the sound and light alarm D1, see Figure 1 .

[0024] See Figure 2 The PLC unit also includes a digital input module, a CPU, a wireless communication module, a communication module, and a touch screen. The communication module is connected to the touch screen through a port, and the power module, the CPU, the digital input module, the digital output module, and the communication module are connected through a port. The wireless communication module is connected to the CPU, and the digital input module is respectively connected to the normally open auxiliary contacts of the power detection contactor K1 and the normally open contacts of the relay KA through ports; the wireless communication module uploads the data information of the CPU to the cloud server through a wireless transmission network, and the cloud server saves the data information to the cloud management center through communication. The cloud management center connects to the mobile device through communication, and the APP of the mobile device downloads the information of the cloud management center and uploads the feedback information to the cloud management center, and then the feedback information is transmitted to the CPU module.

[0025] Working process:

[0026] This device is composed of a power detection contactor K1 and a power switching circuit switch Q2 connected by lines. The power detection contactor K1 is installed on the output side of the voltage-stabilized power supply, and the contacts of the power detection contactor K1 are used to realize the automatic switching of the PLC power supply. The coil power of the power detection contactor K1 is taken from the output side of the voltage-stabilized power supply. When the voltage-stabilized power supply is working normally, the coil of the power detection contactor K1 is energized, and the PLC power supply is powered through the normally open main contacts of the power detection contactor K1; when the voltage-stabilized power supply fails and cannot output voltage normally, the coil of the power detection contactor K1 is de-energized, the normally open main contacts of the power detection contactor K1 are disconnected, and the normally closed contacts are closed, and the PLC power supply is automatically switched to the backup circuit (i.e., control circuit 1), which is directly powered by the transformer. At the same time, the sound and light alarm D1 is energized to alarm, prompting the crane driver that the voltage-stabilized power supply is damaged and needs to be replaced.

[0027] The normally open auxiliary contact of the power detection contactor K1 of the present application is connected to the digital input module, the CPU is connected to the communication module, and the communication module is connected to the touch screen through the port, so that the operator can check the operating status of the voltage-stabilized power supply at any time through the touch screen. The structure is simple and maintenance-friendly. The alarm information of the sound and light alarm is uploaded to the cloud server through the relay KA, and then uploaded to the cloud management center through the cloud server to realize real-time monitoring of the voltage-stabilized power supply, making full use of the resources of the cloud management center to save monitoring costs. Control loop one is used as a backup loop, and the normally closed auxiliary contact one of the power detection contactor K1 can realize the switching of control loop two to control loop one. The structure is simple and easy to operate.

Claims

1. A crane fast switching PLC power supply device, characterized in that: It includes control loop 1 and control loop 2. The input end of control loop 1 and the input end of control loop 2 are both connected to the output end of circuit breaker 1. The output end of control loop 1 and the output end of control loop 2 are both connected to the PLC unit. The input end of circuit breaker 1 is connected to an AC power supply. Control loop 1 includes circuit breaker 2 connected in series and a normally closed auxiliary contact 1 of a contactor. Control loop 2 includes a voltage-stabilizing power supply connected in series and a normally open main contact of a contactor. A control branch 1 is connected in parallel between the voltage-stabilizing power supply and the normally open main contact of the contactor.

2. A crane fast switching PLC power supply device according to claim 1, characterized in that: The control branch 1 includes a coil of a contactor.

3. A crane fast switching PLC power supply device according to claim 1, characterized in that: The control circuit 2 also includes a control branch 2, which is connected in parallel between the output end of the circuit breaker 1 and the input end of the voltage-stabilized power supply. The control branch 2 includes a coil of a relay connected in series and a normally closed auxiliary contact 2 of the contactor. The coil of the relay is connected in parallel with the sound and light alarm.

4. A crane fast switching PLC power supply device according to claim 1, characterized in that: The PLC unit comprises a power supply module. The output end of control loop 1 and the output end of control loop 2 are both connected to the input end of the power supply module. The output end of the power supply module is used to provide a DC working power supply.

5. A crane fast switching PLC power supply device according to claim 4, characterized in that: The PLC unit also includes a digital quantity input module, which is respectively connected to the normally open auxiliary contacts of the contactor and the normally open contacts of the relay through ports.

6. A crane fast switching PLC power supply device according to claim 4, characterized in that: The PLC unit also includes a CPU, a wireless communication module, a communication module, a power module, a digital quantity input module, and a digital quantity output module which are connected through ports, and the wireless communication module is connected to the CPU.

7. A crane fast switching PLC power supply device according to claim 6, characterized in that: The wireless communication module uploads the data information of the CPU to the cloud server through the wireless transmission network. The cloud server saves the data information to the cloud management center through communication. The cloud management center connects to the mobile device through communication. The APP of the mobile device downloads the information of the cloud management center and uploads feedback information to the cloud management center, and then the feedback information is transmitted to the CPU module.

8. A crane fast switching PLC power supply device according to claim 4, characterized in that: The PLC unit also includes a touch screen, and the communication module is connected to the touch screen via a port.

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