Medium-frequency induction heating furnace body, furnace body manufacturing method and temperature control method

An induction heating furnace and manufacturing method technology, applied in the furnace body manufacturing method and temperature control, in the field of medium-frequency induction heating furnace body, can solve the problems of scale formation, low temperature signal of the thermometer, and contact with air, etc., to achieve Simplify the manufacturing process, ensure the pass rate, and ensure the effect of not overheating

Pending Publication Date: 2020-10-13

HANGZHOU KEYUAN ELECTRIC FURNACE CO LTD

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AI-Extracted Technical Summary

Problems solved by technology

[0003] The furnace body of the existing intermediate frequency induction heating furnace generally has a furnace lining inside, and a forehearth through which the billet passes is formed in the middle of the furnace lining; the furnace lining of the furnace body of the existing intermediate frequency induction heating furnace is a seamless whole. When measuring the temperature of the billet, a...

Method used

In the present embodiment, described induction coil 2 can be two sections, wherein the winding direction of two sections induction coil 2 is opposite, and between two sections induction coils 2, connect in series or in parallel, two sections induction coils 2 coaxial Setting; the winding directions of the two induction coils 2 are set in opposite directions, the purpose is to reduce the resonance generated at the joint of the two induction coils 2 .

The body of furnace 01 provide...

Abstract

The invention relates to the technical field of medium-frequency induction heating furnaces, in particular to a medium-frequency induction heating furnace body, a furnace body manufacturing method anda temperature control method. The medium-frequency induction heating furnace body comprises a furnace lining, a material channel allowing a blank to pass through is formed in the middle of the furnace lining, and an induction coil which extends in axial direction of the material channel and is spirally wound on outer side of the material channel is arranged in the furnace lining; and a pluralityof temperature measuring holes are formed in the side wall of the furnace lining in the axial direction of the furnace lining at intervals, the temperature measuring holes are formed in the radial direction of the furnace lining and penetrate through the side wall of the furnace lining, and the temperature measuring holes are located at the intervals between every two adjacent turns of coils of the induction coil. The invention further provides a manufacturing method of the medium-frequency induction heating furnace body and a temperature control method of the medium-frequency induction heating furnace. According to the furnace body, the temperature measuring holes are formed in the side wall of the furnace body for temperature measurement instead of adopting the temperature measurement mode at a discharge port so that the temperature measurement accuracy can be improved.

Application Domain

Linings repairForge furnaces

Technology Topic

EngineeringHeating furnace +4

Image

Examples

Experimental program(5)

Example Embodiment

[0047] Example 1:

[0048] Reference figure 2 As shown, this embodiment provides an intermediate frequency induction heating furnace body, which includes a furnace shell 4 and a furnace lining 1. The furnace lining 1 is provided with a material passage 11 through which the blank passes. During forging, the blank is along the material passage 11 Axial travel.

[0049] The furnace lining 1 is provided with an induction coil 2 extending in the axial direction of the material channel 11 and spirally wound on the outside of the material channel 11; wherein the induction coil 2 is wound by a copper tube.

[0050] The side wall of the furnace lining 1 is provided with a plurality of temperature measuring holes 12 distributed along the axial direction of the furnace lining 1, wherein the temperature measuring holes 12 are arranged radially along the furnace lining 1 and penetrate the side wall of the furnace lining 1 to communicate with the forehearth 11, and the measuring holes 12 The warm hole 12 is located at the interval between two adjacent turns of the induction coil 2. In this embodiment, three temperature measurement holes 12 may be opened, and the three temperature measurement holes 12 are located on a straight line. It should be noted that one turn of the copper tube is recorded as a coil of one turn, and two turns of the copper tube are recorded as two turns in the same way, so the induction coil 2 is composed of several turns of coil.

[0051] The purpose of opening the temperature measuring hole 12 is to serve as a test channel of the subsequent infrared thermometer 9, and the infrared thermometer 9 directly detects the blank in the forehearth 11 through the temperature measuring hole 12.

[0052] The furnace shell 4 is arranged on the outside of the furnace lining 1; and the side wall of the furnace shell 4 is provided with a second through hole 41 coaxially arranged with the temperature measuring hole 12 at a position corresponding to the temperature measuring hole 12; The holes 41 are aligned and connected to ensure that the thermometer 9 can smoothly pass through the temperature measuring hole 12 to detect the temperature of the blank material in the material channel 11.

[0053] A number of insulating strips 3 extending along the axis of the induction coil 2 are fixedly connected to the outer side wall of the induction coil 2; among them, 3 or 4 insulating strips 3 can be provided, and the 4 insulating strips are distributed on the peripheral side of the induction coil 2. Ensure that one of the insulating strips 3 is located on the same side of the temperature measuring hole 12, and that the insulating strip 3 (the insulating strip on the same side as the temperature measuring hole) is provided with a coaxial arrangement with the temperature measuring hole 12 corresponding to the position of the temperature measuring hole 12 The first through hole 31 of the first through hole 31, the second through hole 41, and the temperature measuring hole 12 together form a direct temperature measurement channel, and the infrared ray of the infrared thermometer 9 can be directly passed through the temperature measurement channel In the channel 11, to detect the temperature of the blank in the material channel 11.

[0054] Combine image 3 with Figure 4 As shown, in this embodiment, the two-turn coil outer wall of the induction coil 2 located on both sides of the temperature measuring hole 12 is fixedly connected with a first bolt 5; the insulating strip 3 is provided with a position corresponding to the first bolt 5 A first mounting hole 32 for the first bolt 5 to pass through; the first bolt 5 is threadedly connected with a first nut 51 that is in contact with the outer wall of the insulating strip 3.

[0055] Under the restriction of the first bolt 5 and the insulating strip 3, the two-turn coils on both sides of the temperature measuring hole 12 can be prevented from shrinking, and the two-turn coil can be prevented from blocking the temperature measuring hole 12 after shrinking. Because once the two-turn coils on both sides of the temperature measuring hole 12 are spaced too small, the two-turn coils will block the temperature measuring hole 12, resulting in subsequent failure to measure temperature.

[0056] The insulating strip 3 is provided with a number of second mounting holes 33 spaced apart along the length of the insulating strip 3; the outer side wall of the induction coil 2 is fixedly connected to the second mounting hole 33 at the position corresponding to the second mounting hole 33. The second bolt 6 of the hole 33; the second bolt 6 is threadedly connected with a second nut 61 that is in contact with the outer wall of the insulating strip 3.

[0057] Under the restriction of the second bolt 6 and the insulating strip 3, the contraction between the turns of the induction coil 2 can be effectively prevented, and the short circuit caused by the contact of two adjacent turns of the induction coil 2 can be avoided.

[0058] In this embodiment, the induction coil 2 may be two sections, wherein the winding directions of the two sections of the induction coil 2 are opposite, and the two sections of the induction coil 2 are connected in series or parallel, and the two sections of the induction coil 2 are arranged coaxially; The winding directions of the induction coils 2 are arranged in opposite directions, so as to reduce the resonance generated at the junction of the induction coils 2.

[0059] Implementation principle:

[0060] When the furnace body 01 provided in this embodiment is in use, an infrared thermometer 9 is installed on the outside of each temperature measuring hole 12, which can detect the inner blank of the material channel 11 through the temperature measuring hole 12, so that it can be directly installed in the material channel. The temperature of the blank is detected in 11, and a plurality of temperature measuring holes 12 are set, and the temperature of the blank can be detected in sections to improve the detection accuracy.

Example Embodiment

[0061] Example 2

[0062] Such as Figure 2-Figure 4 As shown, this embodiment provides a method for manufacturing the intermediate frequency induction heating furnace described in Embodiment 1, which specifically includes the following steps:

[0063] S100. Winding induction coil 2: Put the copper tube on the copper tube winding machine, and use the copper tube winding machine to wind the copper tube into a spiral to form a section of induction coil 2; repeat this step to wind several sections according to actual needs Induction coil 2.

[0064] Finally, all the induction coils 2 are connected in series or in parallel, and it should be noted that the induction coils 2 are coaxially arranged.

[0065] In this step, according to the position of the temperature measuring hole 12 to be opened, the gap between the induction coil 2 corresponding to the two-turn coil located on both sides of the temperature measuring hole 12 is appropriately increased, so as to ensure that the two-turn coil will not be blocked The temperature measuring hole 12 ensures that the infrared thermometer 9 can smoothly detect the temperature of the blank in the furnace through the temperature measuring hole 12, because once the two-turn coil on both sides of the temperature measuring hole 12 is too small, the two-turn coil will be blocked The temperature measurement hole 12 is held, resulting in the subsequent temperature measurement failure.

[0066] S200. Installing insulating strip 3 includes the following steps:

[0067] S201: Weld a number of second bolts 6 distributed along the axis of the induction coil 2 on the outer wall of the induction coil 2 at intervals, and weld the first bolts 5 on the outer wall of the two-turn coil of the induction coil 2 located on both sides of the temperature measuring hole 12;

[0068] S202. Opening a second mounting hole 33 on the insulating strip 3 corresponding to the position of the second bolt 6 through which the second bolt 6 passes; opening a first mounting hole 33 on the insulating strip 3 corresponding to the position of the first bolt 5 through which the first bolt 5 passes. Mounting hole 32; according to the predetermined opening position of the temperature measuring hole 12, a first through hole 31 is opened on the insulating strip 3; the opening of the first through hole 31 is mainly used for subsequent coaxial alignment with the temperature measuring hole 12 to form a temperature measuring channel;

[0069] S203. Mount the first mounting hole 32 and the second mounting hole 33 of the insulating strip 3 to the induction coil 2 corresponding to the first bolt 5 and the second bolt 6 respectively;

[0070] S204. After installing the insulating strip 3, screw the first nut 51 on the first bolt 5 and screw the second nut 61 on the second bolt 6; and tighten the first nut 51 and the second nut 61, and pass the A nut 51 and a second nut 61 lock the insulating strip 3 on the induction coil 2; complete the installation of the insulating strip 3;

[0071] In this step, under the restriction of the second bolt 6 matching the insulating strip 3, the inter-turn contraction of the induction coil 2 can be effectively prevented, and the short circuit caused by the contact of two adjacent turns of the induction coil 2 can be avoided; Under the limitation of the insulating strip 3, the two-turn coil on both sides of the temperature measuring hole 12 can be prevented from shrinking, and the two-turn coil can be prevented from blocking the temperature measuring hole 12 after shrinking.

[0072] S300. Installing furnace shell 4 includes the following steps:

[0073] S301: Opening a second through hole 41 coaxially arranged with the first through hole 31 on the side wall of the furnace shell 4 corresponding to the position of the first through hole 31;

[0074] S302. Install the induction coil 2 with the insulating strip 3 installed in the furnace shell 4, align the first through hole 31 with the second through hole 41, and adjust the position of the induction coil 2 in the furnace shell 4 and fix it.

[0075] S400. Installing the mold includes the following steps:

[0076] S401. Insert the furnace lining mold into the furnace shell 4, and pass the furnace lining mold through the induction coil 2, so that the furnace lining mold and the induction coil 2 are coaxially arranged, and then the furnace lining mold is fixed; the furnace lining mold may be a metal tube, Of course, it can also be other molds, which are not limited here. It should be noted that a certain distance is formed between the outer wall of the lining mold and the inner wall of the induction coil 2 to ensure that the inner wall of the lining 1 with a certain thickness is formed inside the induction coil 2 during subsequent pouring.

[0077] S402: Prepare a temperature measurement hole mold for forming the temperature measurement hole 12, where the temperature measurement hole mold may be a straight metal rod, which is not specifically limited here;

[0078] S403. Pass the temperature measuring hole mold from the outside of the furnace shell 4 through the second through hole 41 on the furnace shell 4 and the first through hole 31 on the insulating strip 3 in sequence, and finally make the temperature measuring hole mold from the phase of the induction coil 2 Pass between the turns of two adjacent coils until the inner end of the temperature measuring hole 12 mold is pressed against the outer wall of the lining mold;

[0079] S500, pouring furnace lining 1. Add a certain proportion of water to the cement, and start pouring construction after mixing evenly, including the following steps:

[0080] S501. Pour cement into the furnace shell 4. The cement enters the gap between the induction coil 2 and the furnace lining mold from the inter-turn gap of the induction coil 2 until the furnace shell 4 is filled with cement; in this process, while building, While vibrating the cement, ensure that the furnace shell 4 is filled with cement to ensure the insulation and heat preservation effect of the induction coil 2.

[0081] S502. During the pouring process, adjust the temperature measuring hole mold at every interval of time, so that the inner end of the temperature measuring hole mold is pressed against the outer wall of the lining mold, so as to prevent the temperature measuring hole mold from shifting during the pouring process , Resulting in the failure of the furnace lining mold, resulting in the subsequent failure to form a complete temperature measurement hole 12.

[0082] S600, demoulding: when the lining 1 is solidified, take out the lining mold and the temperature measuring hole mold, and let it stand for a period of time; specifically, it can be left to stand for 12-24 hours, so that after the lining mold is drawn out, the material channel 11, the temperature measuring hole is formed After the mold is drawn out, a temperature measuring hole 12 is formed on the side wall of the furnace lining 1.

[0083] S700, heating and drying furnace lining 1: heat and dry the poured furnace lining 1 to volatilize the moisture in the furnace lining 1 until the furnace lining 1 is completely dry.

[0084] S800. After the furnace lining 1 is dried, use an insulation tester to test the insulation of the furnace lining 1. Specifically, the insulation resistance of the furnace lining 1 can be tested. If the insulation is qualified, the manufacturing is completed; otherwise, continue drying until the insulation test is qualified.

Example Embodiment

[0085] Example 3

[0086] Combine figure 1 As shown, this embodiment provides a temperature control method applied to the electric furnace body 01 in Embodiment 1, which specifically includes the following steps:

[0087] The first step is to install a thermometer 9 coaxially arranged with the temperature measuring hole 12 outside each of the temperature measuring holes 12 (the thermometer at the temperature measuring hole is not shown), wherein the thermometer 9 is specifically An infrared thermometer can be used.

[0088] All the thermometers 9 are connected to the control device, and the control device is used to control and adjust the input power of the induction coil 2 according to the temperature signal fed back by the thermometer 9. The control device can be a PLC or a finished instrument, of course, it can also be another control device, which is not specifically limited here; the following uses a PLC as the control device as an example for description.

[0089] Corresponding to each thermometer 9 in the PLC, a temperature interval is set correspondingly as the basis for PLC feedback adjustment.

[0090] The second step, the first furnace starts: when the blank material advances to the feeding end of the forehearth 11, the PLC controls the induction coil 2 to start working;

[0091] In the third step, the billet enters the forehearth 11 and then advances along the axial direction of the forehearth 11; along the advancing direction of the billet, the temperature measurement signal 9 outside the temperature measuring hole 12 is fed back to the PLC to detect the temperature signal. When the material reaches the position of a temperature measuring hole 12, the thermometer 9 at the temperature measuring hole measures the real-time temperature of the blank, and the PLC compares the real-time temperature with the temperature range corresponding to the thermometer 9 and adjusts the induction coil Input power, the specific adjustment method is:

[0092] When the blank material is lower than the minimum value of the temperature range corresponding to the thermometer 9, the PLC increases the input power of the induction coil 2. When the blank material temperature is higher than the maximum value of the temperature range corresponding to the thermometer 9, the PLC reduces Input power of small induction coil 2

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Medium-frequency induction heating furnace body, furnace body manufacturing method and temperature control method

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

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Examples

Example Embodiment

Example Embodiment

Example Embodiment

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Description & Claims & Application Information

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