Temperature control system of electric hot melting welding equipment

Abstract

The utility model discloses a temperature control system of electric hot melting welding equipment, which belongs to the field of electric heating, adopts a PLC (programmable logic controller) to control the output power of an SCR (selective catalytic reduction) electric regulator to control a heating element, further heats the equipment through a heating body, and is matched with a temperature sensor to control the temperature accurately, the service life of the heating element is long, and the equipment is not easy to fail. The PLC is powered by a power supply module, the electric power regulator is connected with three-phase power through a circuit breaker QF, the electric power regulator is electrically connected with the heating element, the heating element is installed in a heating body, a temperature sensor is arranged at the end of the heating body, the PLC is electrically connected with the electric power regulator, and the PLC is electrically connected with the electric power regulator. And the PLC is connected with the temperature sensor. The temperature control device is mainly used for temperature control of the macromolecule sheet electric hot melting welding equipment.

Description

Technical Field

[0001] The utility model relates to the field of electric heating, in particular to a temperature control system of electric hot-melt welding equipment. Background Art

[0002] The welding of polymer sheets generally adopts the hot melt pressure welding process of electric heating equipment, which has increasingly higher requirements for temperature accuracy and stability. There are three main types of conventional temperature control systems in the field of electric heating:

[0003] 1. The temperature control instrument controls the temperature control system of the AC contactor. This system is a position control system, the temperature control is not accurate, the fluctuation range is large, and it is often used in electric heating systems with low accuracy requirements.

[0004] 2. The intelligent PID temperature control instrument controls the temperature control system of the solid-state relay SSR. The SSR is frequently turned on and off to control the duty cycle of the heating element. The temperature control is more precise and the fluctuation range is smaller. It is the most commonly used temperature control system, but the life of the heating element is short.

[0005] 3. The temperature control system that adjusts the working voltage of the heating element. Voltage regulation is to change the conduction time of each half cycle of the alternating current. It is used in situations where stability requirements are relatively high. However, this system will generate high-order harmonics, which will cause greater pollution to the power grid and have high requirements for devices.

[0006] Since polymer sheet materials are thin and easily deformed, the welding needs to be firm and beautiful. The electric heating system of hot melt welding equipment has large thermal inertia and requires precise temperature control. Conventional temperature control systems cannot meet the requirements. For example, a control circuit device for visual and convenient multi-stage constant temperature heating with announcement number CN219087323U realizes multi-stage constant temperature heating through an SCR power regulator, but it also needs to cooperate with the corresponding heating element to finally realize precise temperature control of electric hot melt welding equipment. Summary of the invention

[0007] The purpose of the utility model is to provide a temperature control system for electric hot-melt welding equipment, which adopts a method of controlling the output power of an SCR power regulator by a PLC controller to control a heating element, and then heats the equipment through a heating element, and cooperates with a temperature sensor to accurately control the temperature, the heating element has a long service life, and the equipment is not prone to failure.

[0008] The utility model is realized by the following technical solutions:

[0009] A temperature control system for electric hot-melt welding equipment includes a PLC controller, which is powered by a power module, a power regulator and a heating element. The power regulator is connected to three-phase electricity through a circuit breaker QF, the power regulator is electrically connected to the heating element, the heating element is installed in a heating body, a temperature sensor is provided at the end of the heating body, the PLC controller is electrically connected to the power regulator, and the PLC controller is connected to the temperature sensor.

[0010] Furthermore, a plurality of heating elements are arranged throughout the heating body.

[0011] Furthermore, the heating element is a heat-resistant single-head electric heating tube.

[0012] Furthermore, the temperature sensor is a PT100 platinum thermal resistance sensor.

[0013] Furthermore, the power regulator is a digital SCR power regulator.

[0014] Furthermore, the heating element is a high thermal conductivity aluminum alloy or a micro-alloyed copper alloy.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. The heating element heats up evenly, the temperature is accurate and stable, and compared with the temperature control system in which the temperature control instrument controls the on and off of the AC contactor, the temperature fluctuation range becomes smaller.

[0017] 2. The heating element has a long life. Compared with the temperature control system of the solid-state relay SSR controlled by the intelligent PID temperature control instrument, the heating element has a longer life.

[0018] 3. Energy saving and environmental protection, no pollution to the power grid, compared with the temperature control system that adjusts the working voltage of the heating element, it reduces harmonic current.

[0019] 4. Drill a through hole in the length direction of the heating element and insert a heat-resistant single-head heating tube that is set through it. This will extend the life of the heating element and structurally ensure that the heating element can heat up evenly and with good stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a circuit schematic diagram of the utility model;

[0021] Figure 2 It is a structural schematic diagram of the heating element of the utility model;

[0022] Figure 3 It is a schematic diagram of the installation of the temperature sensor of the utility model.

[0023] In the figure: 1. heating body; 2. heating element; 3. temperature sensor. DETAILED DESCRIPTION

[0024] The utility model is further described below in conjunction with the accompanying drawings.

[0025] like Figure 1 – Figure 3 As shown, Example 1, a temperature control system of an electric hot-melt welding equipment, includes a PLC controller, which is powered by a power module. The above is the prior art, and also includes a power regulator and a heating element. The power regulator is connected to three-phase electricity through a circuit breaker QF, and the power regulator is electrically connected to the heating element 2. The heating element 2 is installed in a heating body 1. A temperature sensor 3 is provided at the end of the heating body 1. The heating body 1 is drilled and tapped, and a thread is provided on the outside of the temperature sensor 3. The temperature sensor 3 is screwed into the heating body 1. The PLC controller is electrically connected to the power regulator, and the PLC controller is connected to the temperature sensor 3. The heating body 1 plays a heat-conducting role. The power regulator has multiple protection functions such as soft start, overcurrent, and disconnection, so that the circuit design of the system is simple and reliable.

[0026] Embodiment 2, a temperature control system of an electric hot-melt welding device, wherein a plurality of heating elements 2 are arranged throughout the heating element 1, a through hole is drilled in the length direction of the heating element 1, and a heat-resistant single-head heating tube is inserted therethrough, which has a longer service life and structurally ensures that the heating element 1 can heat up evenly and has good stability. Only one temperature measuring point is required for the entire heating element 1, so as to avoid mutual influence when the vertically arranged heating elements are measured in sections; the temperature sensor 3 is a PT100 platinum thermal resistor sensor; the power regulator is a digital SCR power regulator; the heating element 1 is a high thermal conductivity aluminum alloy or a micro-alloyed copper alloy, and the heating element 1 is made of an alloy profile with good thermal conductivity and a certain strength, and the rest is the same as Embodiment 1.

[0027] By optimizing the structural design of the heating element 1 and the heating element 2, the heating element 1 is ensured to heat quickly and evenly. The PT100 platinum thermal resistor sensor transmits the temperature signal to the PLC controller, and the PLC controller outputs the control signal to the SCR power regulator, which performs stepless analog fuzzy regulation on the heating element to control the temperature of the polymer sheet electric hot melt welding equipment, thereby ensuring that the temperature meets the accuracy requirements. The SCR power regulator can switch when the AC power passes through zero, without pollution to the power grid and low requirements for devices. This system has high control accuracy, long service life of the heating element, and is energy-saving and environmentally friendly.

Claims

1. A temperature control system for electric hot-melt welding equipment, comprising a PLC controller, the PLC controller is powered by a power module, and is characterized in that: It also includes a power regulator and a heating element. The power regulator is connected to three-phase electricity via a circuit breaker QF. The power regulator is electrically connected to the heating element (2). The heating element (2) is installed in the heating element (1). A temperature sensor (3) is provided at the end of the heating element (1). The PLC controller is electrically connected to the power regulator, and the PLC controller is connected to the temperature sensor (3).

2. The temperature control system of the electric hot-melt welding equipment according to claim 1 is characterized in that: A plurality of heating elements (2) are arranged throughout the heating body (1).

3. The temperature control system of the electric hot-melt welding equipment according to claim 1 or 2, characterized in that: The heating element (2) is a single-head electric heating tube.

4. The temperature control system of the electric hot-melt welding equipment according to claim 1 is characterized in that: The temperature sensor (3) is a thermal resistance sensor.

5. The temperature control system of the electric hot-melt welding equipment according to claim 1 is characterized in that: The power regulator is an SCR power regulator.

6. The temperature control system of the electric hot-melt welding equipment according to claim 1, characterized in that: The heating element (1) is a high thermal conductivity aluminum alloy or a micro-alloyed copper alloy.

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