Steel plate thickness measuring device for heat treatment furnace

Abstract

The utility model provides a steel plate thickness measuring device for a heat treatment furnace, which comprises an optical signal channel pipe which is arranged on the top of the heat treatment furnace in a penetrating manner and is aligned with the center of an optical signal path, and a cooling gas inlet pipe is arranged on the side wall of a pipe section, positioned outside the heat treatment furnace, of the optical signal channel pipe; according to the utility model, the optical channel for introducing the cooling gas is established, so that the interference of high-temperature flowing atmosphere in the furnace on a thickness measurement optical signal is reduced, and the thickness measurement precision is improved.

Description

Technical Field

[0001] The present application relates to the technical field of heat treatment of industrial furnaces in the metallurgical industry, and in particular to a steel plate thickness measuring device for a heat treatment furnace. Background Art

[0002] A complete thin plate quenching and tempering heat treatment line, the core components include protective atmosphere roller hearth quenching furnace and quenching machine. In order to protect the quenching machine and prevent the steel plates from entering the quenching machine, a thickness gauge is usually set at the exit of the quenching furnace. Through the opening on the top of the furnace, the light signal of the thickness gauge is emitted to the surface of the steel plate and the returned light signal is received to calculate the thickness of the steel plate. At this time, the measured value is compared with the preset value to know whether there is a plate overlap in the furnace.

[0003] However, the high temperature atmosphere in the heat treatment furnace will refract the light signal emitted by the thickness gauge, resulting in poor measurement accuracy. Even in an empty furnace, the error returned by the thickness gauge is generally above ±1mm, making it difficult to effectively distinguish between normal and overlapped states. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a steel plate thickness measuring device for a heat treatment furnace in order to address the above-mentioned problems, thereby reducing the influence of the high-temperature flowing atmosphere in the furnace on the thickness measurement accuracy.

[0005] The embodiment of the present application is implemented as follows:

[0006] An embodiment of the present application provides a steel plate thickness measuring device for a heat treatment furnace, characterized in that it includes an optical signal channel tube, which is penetrated through the top of the heat treatment furnace and is aligned with the center of the optical signal path. A cooling gas inlet pipe is provided on the side wall of the tube section of the optical signal channel tube located outside the heat treatment furnace, and a cooling gas outlet is provided on the side wall of the tube section of the optical signal channel tube located inside the heat treatment furnace.

[0007] In some optional embodiments, the optical signal channel tube is made of a heat-resistant steel tube, the heat-resistant steel tube located inside the heat treatment furnace is wrapped with a refractory material layer, and the two ends of the optical signal channel tube are respectively provided with heat-resistant glass plates.

[0008] In some optional embodiments, the outer wall of the tube mouth of the optical signal channel tube outside the heat treatment furnace is provided with a fixed flange, the top of the fixed flange is connected to the connecting flange by bolts, and the heat-resistant glass plate is located between the fixed flange and the connecting flange.

[0009] In some optional embodiments, the optical signal channel tube is provided with an end cap at the tube opening inside the heat treatment furnace, the glass plate is arranged inside the end cap, and the end cap is provided with a center hole, and the diameter of the center hole is smaller than the diameter of the glass plate.

[0010] In some optional embodiments, the cooling gas outlet is provided on the side wall of the end cover.

[0011] In some optional embodiments, the cooling gas is cold nitrogen.

[0012] In some optional embodiments, an anchor is preset on the optical signal channel tube and connected to the refractory material layer.

[0013] The beneficial effects of the present application are as follows: the present application provides a steel plate thickness measuring device for a heat treatment furnace, which can reduce the temperature in the channel through the cooling of cold nitrogen and the heat resistance of refractory materials, thereby creating better conditions for the passage of the thickness gauge optical signal and improving the thickness measurement accuracy; the optical signal channel tube can also serve as a nitrogen replenishment hole in the furnace to reduce the number of nitrogen inlet holes in the furnace body. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a structural schematic diagram of a specific embodiment of the utility model. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0017] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0018] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0019] The features and performance of the present application are further described in detail below in conjunction with the embodiments.

[0020] like Figure 1 As shown, the utility model provides a steel plate thickness measuring device for a heat treatment furnace, including an optical signal channel tube, the optical signal channel tube is penetrated on the furnace top 1 of the heat treatment furnace, and is arranged aligned with the center of the optical signal path. A cooling gas inlet pipe 2 is provided on the side wall of the tube section of the optical signal channel tube located outside the heat treatment furnace, and a cooling gas outlet 3 is provided on the side wall of the tube section of the optical signal channel tube located inside the heat treatment furnace.

[0021] The optical signal channel tube is made of a heat-resistant steel tube 4 . The heat-resistant steel tube inside the heat treatment furnace is wrapped with a refractory material layer 5 . Heat-resistant glass plates 6 are provided at two ends of the optical signal channel tube.

[0022] The installation position of the optical signal channel tube is determined according to the installation position of the thickness gauge 7 outside the furnace. The optical signal of the thickness gauge passes through the optical signal channel tube and the glass plates at both ends of the tube to the top of the roller surface 8 in the furnace for thickness measurement.

[0023] A fixing flange 9 is provided on the outer wall of the tube mouth of the optical signal channel tube outside the heat treatment furnace. The top of the fixing flange is connected to a connecting flange 10 by bolts. A heat-resistant glass plate is located between the fixing flange and the connecting flange. The glass plate is clamped and fixed by a double-layer flange and a connecting piece.

[0024] The optical signal channel tube is located at the pipe mouth inside the heat treatment furnace and is sleeved with an end cover 11. A glass plate is arranged inside the end cover. The end cover is provided with a center hole. The diameter of the center hole is smaller than the diameter of the glass plate. The end cover supports and positions the glass plate. At the same time, a cooling gas outlet is provided on the side wall of the end cover, and the cooling gas escapes into the furnace.

[0025] The cooling gas is cold nitrogen or other gas that does not affect the composition of the furnace gas, which can reduce the temperature in the channel. The refractory layer plays a heat-resistant role, creating better conditions for the passage of the thickness gauge optical signal and improving the thickness measurement accuracy. Due to the use of nitrogen, the optical signal channel tube can serve as a nitrogen replenishment hole in the furnace, reducing the number of nitrogen inlet holes in the furnace body.

[0026] Anchors 12 are preset on the optical signal channel tube and connected to the refractory material layer to improve the firmness of the installation.

Claims

1. A steel plate thickness measuring device for a heat treatment furnace, characterized in that: It includes an optical signal channel tube, which is passed through the top of the heat treatment furnace and aligned with the center of the optical signal path. A cooling gas inlet pipe is provided on the side wall of the tube section of the optical signal channel tube located outside the heat treatment furnace, and a cooling gas outlet is provided on the side wall of the tube section of the optical signal channel tube located inside the heat treatment furnace.

2. The steel plate thickness measuring device for a heat treatment furnace according to claim 1, characterized in that: The optical signal channel tube is made of a heat-resistant steel tube. The heat-resistant steel tube located inside the heat treatment furnace is wrapped with a refractory material layer. The two ends of the optical signal channel tube are respectively provided with heat-resistant glass plates.

3. The steel plate thickness measuring device for a heat treatment furnace according to claim 2, characterized in that: The outer wall of the tube opening of the optical signal channel tube located outside the heat treatment furnace is provided with a fixing flange, the top of the fixing flange is connected to the connecting flange by bolts, and the heat-resistant glass plate is located between the fixing flange and the connecting flange.

4. A steel plate thickness measuring device for a heat treatment furnace according to claim 2 or 3, characterized in that: The tube opening of the optical signal channel tube located inside the heat treatment furnace is sleeved with an end cover, the glass plate is arranged inside the end cover, and the end cover is provided with a center hole, and the aperture of the center hole is smaller than the diameter of the glass plate.

5. The steel plate thickness measuring device for a heat treatment furnace according to claim 4, characterized in that: The cooling gas outlet is arranged on the side wall of the end cover.

6. A steel plate thickness measuring device for a heat treatment furnace according to claim 1 or 5, characterized in that: The cooling gas is cold nitrogen.

7. The steel plate thickness measuring device for a heat treatment furnace according to claim 2, characterized in that: An anchor is preset on the optical signal channel tube and connected to the refractory material layer.

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