Variable-frequency induction heating system for preheating large-diameter metal rod or large-size metal blank before processing

Abstract

A preheating variable-frequency induction heating system before large-diameter metal rod or large-size metal blank processing is characterized in that a variable-frequency power supply control cabinet is connected with a transformer, the variable-frequency power supply control cabinet electrically controls a variable-frequency induction coil and a capacitor bank in a heating furnace, a hydraulic or electric lifting mechanism is arranged above the heating furnace, and the heating furnace is provided with a nitrogen protection device. The variable-frequency power source control cabinet is provided with a temperature control system, the temperature control system monitors the heating furnace through an infrared thermometer and a thermocouple thermometer, the variable-frequency power source supplies power to the variable-frequency power source control cabinet, the variable-frequency induction coil is controlled by the variable-frequency power source control cabinet, and the heating furnace composed of the variable-frequency induction coil is in an up-down moving mode. Due to the fact that the metal bar or the blank is large in diameter and weight and not prone to moving and entering the heating furnace, after the metal bar is stably placed, the heating furnace descends, and the metal bar enters the heating furnace. And after heating is completed, the heating furnace ascends, and the heated metal rod is moved away by the clamp for standby application. Due to high induction heating efficiency, less metal material oxidation and uniform heating temperature, the quality of metal workpieces can be improved, raw materials are saved, environmental pollution is avoided, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of metal hot processing, and specifically relates to a variable frequency induction heating system used for large diameter (500-2000mm) metal bars or metal blanks (single side 500-2000mm) before hot processing such as forging and extrusion. Background Art

[0002] At present, the equipment used for heating large diameter (500-2000mm) metal bars or metal blanks (single side 500-2000mm) before forging and extrusion is mainly gas heating furnace. It usually takes 2-15 hours for a gas heating furnace to heat large diameter (500-2000mm) metal bars or blanks. Due to the long heating time, the metal surface is severely oxidized, and the metal material burnout rate reaches 2-8% or even higher. In addition, gas heating relies on heat conduction to heat up the inside of the metal material, so the temperature of the metal material is uneven, and the heating temperature cannot be controlled in real time, which affects the quality of metal processing parts. Summary of the invention

[0003] In order to overcome the above-mentioned deficiencies of the prior art, the purpose of the utility model is to provide a variable frequency induction heating system for preheating large diameter metal rods or blanks before processing, which utilizes the alternating magnetic field generated by the induction coil to heat the metal material.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A variable frequency induction heating system for preheating large diameter metal rods or metal blanks before processing, comprising a variable frequency power supply control cabinet, which is powered by a transformer, controls a capacitor bank and an induction heating furnace composed of a variable frequency induction coil, and the induction coil generates an alternating magnetic field. The induction coil and the metal material therein can be protected by nitrogen. The heating temperature is controlled by a temperature control system according to a set temperature during the heating process.

[0006] The variable frequency induction coil is fixed in the heating furnace shell. The heating furnace shell is designed according to actual conditions. The heating furnace shell has a fixed induction coil, which seals the metal rod material entering the heating furnace from contact with the air, and can input nitrogen into the induction coil and the metal rod through a nitrogen protection device. A hydraulic or electric lifting device drives the heating furnace shell to rise or fall, so that the metal material enters and exits the sensor. The heating furnace also has heating, heat preservation and protection functions.

[0007] The beneficial effects of the utility model are:

[0008] The large diameter (500-2000mm) metal bars or metal blanks (single side 500-2000mm) heated by this patented product have the advantages of fast heating speed, uniform and accurate metal material temperature, no surface oxidation, no overburning, and no environmental pollution. It improves the quality of metal processing parts, improves production efficiency, saves 2-8% of metal raw materials, and induction heating has no exhaust gas emissions and no environmental pollution.

[0009] This patented product has been applied in the metal material processing industry. The metal materials forged or extruded after heating by this patented product have been used in aviation, transportation, oil pipelines, flange and valve processing, water supply and drainage, electricity and other fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the principle of the utility model.

[0011] Among them, 1 is a variable frequency power supply control cabinet; 2 is a transformer; 3 is a heating furnace body in which a variable frequency induction coil is fixed; 4 is a capacitor bank; 5 is a hydraulic or electric furnace body lifting mechanism; 6 is a nitrogen protection device; and 7 is a temperature control system. DETAILED DESCRIPTION

[0012] The utility model is further described below in conjunction with the accompanying drawings.

[0013] like Figure 1 As shown, a variable frequency induction heating system for preheating a large diameter metal rod or blank before processing comprises: a variable frequency power supply (1), a transformer (2), a heating furnace (3) in which a variable frequency induction coil is fixed, a capacitor bank (4), a hydraulic or electric lifting mechanism (5), a nitrogen protection device (6), and a temperature control system (7) including an infrared thermometer (7-1) and a thermocouple thermometer (7-2).

[0014] A variable frequency induction heating system for preheating large diameter metal bars or blanks before processing, comprising a variable frequency power supply (1), a variable frequency power supply control cabinet (1) powered by a transformer (2), a variable frequency power supply control cabinet (1) controlling a variable frequency induction coil (3) and a capacitor group (4) in a heating furnace, and a hydraulic or electric lifting mechanism (5) completing the up and down movement of the heating furnace so that the metal bars can enter and exit the heating furnace. For metal materials with a long heating time, nitrogen can also be connected to the nitrogen protection device (6) of the heating furnace to prevent metal oxidation. During the heating process, the temperature control system (7) analyzes and processes the temperature signal of the metal part measured by an infrared thermometer (7-1) and a thermocouple thermometer (7-2), sends a control signal to the variable frequency power supply, controls the output power of the variable frequency power supply, and controls the heating temperature.

[0015] The variable frequency induction coil (3) is fixed in the shell of the heating furnace by insulating material and refractory material. The heating furnace is moved up and down by a hydraulic or electric lifting mechanism (5). A nitrogen protection device (6) is provided on the shell of the heating furnace. The heating temperature is controlled by a temperature control system (7) according to a set temperature.

[0016] The working principle of the utility model is:

[0017] Follow these steps:

[0018] 1) A hydraulic or electric lifting mechanism (5) moves the heating furnace upward;

[0019] 2) Place the large diameter metal rod on the base below the heating furnace;

[0020] 3) A hydraulic or electric lifting mechanism (5) moves the heating furnace downward so that the heating furnace completely covers the metal bar to be heated;

[0021] 4) Setting the heating temperature in the temperature control system (7);

[0022] 5) Turn on the nitrogen protection device (6);

[0023] 6) Start the variable frequency power supply (1) and start heating. When the metal rod reaches the set temperature, the machine stops and gives a temperature-reaching signal to keep the temperature for later use;

[0024] 7) The hydraulic or electric lifting mechanism (5) moves the heating furnace upward, and the heated metal rod or billet is completely exposed, and is transported away by a forklift or crane for forging or extrusion hot processing.

Claims

1. A variable frequency induction heating system for preheating large diameter metal rods or large size metal blanks before processing, comprising a variable frequency power supply control cabinet (1), characterized in that: The variable frequency power supply control cabinet (1) is connected to the transformer (2). The variable frequency power supply control cabinet (1) electrically controls the variable frequency induction coil (3) and the capacitor bank (4) in the heating furnace. A hydraulic or electric lifting mechanism (5) is provided above the heating furnace. The heating furnace is provided with a nitrogen protection device (6). The variable frequency power supply control cabinet (1) is provided with a temperature control system (7). The temperature control system (7) monitors the heating furnace through an infrared thermometer (7-1) and a thermocouple thermometer (7-2).

2. A variable frequency induction heating system for preheating large diameter metal rods or large size metal blanks before processing according to claim 1, characterized in that: The variable frequency induction coil (3) is fixed in the shell of the heating furnace by insulating material and refractory material, and the heating furnace is moved up and down by a hydraulic or electric lifting mechanism (5).

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