Electric control system for preheating before startup

Abstract

The utility model discloses an electric control system for preheating before starting, and belongs to the technical field of plastic package production auxiliary equipment. The system comprises a main power supply loop and a local control loop. In the main power supply loop, a live wire and a zero wire are connected to a contactor through a main switch, and the output end of the contactor is connected to a glue box; in the local control loop, the time relay is connected in parallel between the main switch and the contactor, and the time relay can control the on-off of the contactor; the glue box preheating device effectively solves the problem that the productivity is wasted as the glue box can be preheated only after a worker goes to work and cannot be started in the process of waiting for the completion of preheating at present.

Description

Technical Field

[0001] This utility model relates to the technical field of auxiliary equipment for plastic packaging production, specifically to an electrical control system for preheating before startup. Background Technology

[0002] Plastic packaging manufacturers need to preheat the plastic boxes before starting their daily production tasks. The preheating time varies from half an hour to one and a half hours depending on the amount of raw materials. Workers cannot work normally before the preheating is completed, which obviously leads to a waste of productivity. Therefore, it is necessary to design a structure that can preheat the machine before workers start their work. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide an electronic control system for preheating before starting the machine, so as to solve the problem of wasted productivity that currently requires workers to start work before the glue box can be preheated, and the machine cannot start while waiting for the preheating to be completed.

[0004] To solve the above problems, this utility model provides the following technical solution:

[0005] An electronic control system for preheating before startup; it includes a main power supply circuit and a local control circuit;

[0006] In the main power supply circuit, the live wire and the neutral wire are connected to the contactor through the main switch, and the output terminal of the contactor is connected to the plastic box.

[0007] In the local control circuit, the time relay is connected in parallel between the main switch and the contactor, and the time relay can control the on and off of the contactor.

[0008] Preferably, it also includes a processor powered by an independent power supply; the processor is connected to an auxiliary relay via a wire; the contacts of the auxiliary relay and the contacts of the time relay are connected in parallel to the circuit of the contactor; the processor also has a built-in wireless communication module; the remote terminal is connected to the processor via the wireless communication module.

[0009] Furthermore, the processor also includes an optocoupler isolator; the optocoupler isolator is used to detect the on / off state of the contactor.

[0010] Furthermore, it also includes a mode switching switch for switching between auxiliary relays or time relays controlling the contactor.

[0011] Furthermore, the mode switching switch is a two-contact rotary switch; the common terminal of the mode switching switch is connected to a contactor; the two outputs are respectively connected to the contacts of a time relay and an auxiliary relay.

[0012] The beneficial effects of this utility model are reflected in the following aspects:

[0013] 1. Improved efficiency: The preheating time is dynamically adjustable, reducing worker waiting time;

[0014] 2. Cost optimization: Remote management reduces labor costs;

[0015] 3. Strong compatibility: It can be adapted to most industrial plastic boxes without modifying existing equipment. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention in an embodiment;

[0017] Explanation of reference numerals in the attached diagram: 1. Main switch; 2. Contactor; 3. Plug box; 4. Time relay; 5. Processor; 6. Auxiliary relay; 7. Optocoupler isolator; 8. Remote terminal; 9. Wireless communication module; 10. Mode switching switch. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0019] Example:

[0020] Reference Figure 1 This embodiment provides an electronic control system for preheating before power-on; it includes a main power supply circuit and a local control circuit;

[0021] In the main power supply circuit, the live wire and the neutral wire are connected to the contactor 2 (model LC1D09) through the main switch 1, and the output terminal of the contactor 2 is connected to the plastic box 3.

[0022] In the local control circuit, time relay 4 is connected in parallel between the main switch and contactor 2, and time relay 4 (model H3Y-2 0-24H) can control the on / off state of contactor 2.

[0023] It also includes a processor 5 (model ESP32-WROOM-32D) powered by an independent power supply; the GPIO pins of the processor 5 are connected to an auxiliary relay 6 via wires; the contacts of the auxiliary relay 6 are connected in parallel with the contacts of the time relay 4 and then connected to the circuit of the contactor 2; the processor 5 also has a built-in wireless communication module 9 (the ESP32-WROOM-32D has a built-in Wi-Fi / BLE dual-mode communication unit); the remote terminal 8 is connected to the processor 5 via the wireless communication module 9. In this embodiment, the remote terminal 8 is a mobile phone, which communicates with the processor based on the MQTT protocol and can directly set the preheating time requirement for the next day on the mobile APP.

[0024] The processor 5 also includes an optocoupler 7 (model PC817); the optocoupler 7 is used to detect the on / off state of the contactor 2.

[0025] It also includes a mode switching switch 10 for switching between auxiliary relay 6 or time relay 4 to control the contactor.

[0026] The mode switching switch 10 is a two-contact rotary switch (model LA38-11); the common terminal of the mode switching switch 10 is connected to the contactor 2; the two outputs are respectively connected to the contacts of the time relay 4 and the auxiliary relay 6.

[0027] When the mode switch is connected to the auxiliary relay contact, it operates in remote control mode. Upon reaching the set time, the processor sends a high-level signal to the auxiliary relay coil, closing the normally open contact and energizing the contactor coil, thus powering the heat exchange box and initiating preheating. The remote control circuit of the mode switch is not electrically connected to the local control circuit; the path is switched only through mechanical contacts. In the event of a factory network outage or a remote module failure, it can switch to local control mode to ensure continuous operation of the preheating function.

[0028] When the mode switch is connected to the time relay contact, it is in local mode. At this time, the time relay automatically closes its contact at a preset time, and the contactor coil is energized to start the rubber box.

[0029] Throughout the process, the contactor coil voltage is detected by the optocoupler isolator and the status signal is fed back to the processor. After receiving the corresponding signal, the processor pushes the "warming up" status to the mobile APP via wireless communication.

[0030] After preheating is complete, the auxiliary relay or time relay will de-energize the contactor coil, and the glue box will enter standby mode.

Claims

1. An electronic control system for preheating before startup, characterized in that: It includes the main power supply circuit and the local control circuit; In the main power supply circuit, the live wire and the neutral wire are connected to the contactor (2) through the main switch (1), and the output terminal of the contactor (2) is connected to the plastic box (3). In the local control circuit, the time relay (4) is connected in parallel between the main switch and the contactor (2), and the time relay (4) can control the on and off of the contactor (2).

2. The electronic control system for preheating before startup according to claim 1, characterized in that: It also includes a processor (5) powered by an independent power supply; the processor (5) is connected to an auxiliary relay (6) via a wire; the contacts of the auxiliary relay (6) are connected in parallel with the contacts of the time relay (4) and then connected to the circuit of the contactor (2); a wireless communication module (9) is also built into the processor (5); a remote terminal (8) is connected to the processor (5) via the wireless communication module (9).

3. The electronic control system for preheating before startup according to claim 2, characterized in that: The processor (5) also includes an optocoupler (7); the optocoupler (7) is used to detect the on / off state of the contactor (2).

4. The electronic control system for preheating before startup according to claim 2, characterized in that: It also includes a mode switching switch (10) for switching the auxiliary relay (6) or time relay (4) to control the contactor.

5. The electronic control system for preheating before startup according to claim 4, characterized in that: The mode switching switch (10) is a two-contact rotary switch; the common terminal of the mode switching switch (10) is connected to the contactor (2); the two outputs are respectively connected to the contacts of the time relay (4) and the auxiliary relay (6).

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