Carbon potential detection device of carburizing furnace

Abstract

The utility model relates to a carbon potential detection device of a carburizing furnace, which comprises the carburizing furnace, a detection hole is arranged on the side wall of the carburizing furnace, a detection transition pipe communicated with the detection hole is arranged on the outer wall of the carburizing furnace in an outward extending manner, a nitrogen filling pipe is arranged on the side wall of the detection transition pipe, a detection rod can be inserted into the detection transition pipe, and the nitrogen filling pipe is communicated with the detection hole. The head part of the detection rod extends into the carburizing furnace and is provided with a placing rack for placing a carbon fixing plate, and the tail part of the detection rod extends out of the detection transition pipe. According to the utility model, the carbon determination plate is cooled through the detection transition pipe, nitrogen is filled into the detection transition pipe through the nitrogen filling pipe in the cooling process, the carbon determination plate is prevented from being oxidized, the carbon determination plate is taken out and weighed after being cooled, the carbon potential is calculated according to the initial weight and the final weight of the carbon determination plate, the carbon potential data is accurate, and the product quality is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of heat treatment, in particular to a carbon potential detection device for a carburizing furnace. Background Art

[0002] Carburizing is one of the main processes of chemical heat treatment. It mainly heats low-carbon steel parts to the austenite state in a carburizing medium and keeps it warm, so that carbon atoms penetrate into the surface of the low-carbon steel parts, thereby allowing the low-carbon steel parts to obtain a certain surface carbon content and carbon concentration. Carburizing can greatly improve the hardness and other mechanical properties of low-carbon steel parts.

[0003] In the carburizing process, carbon potential is a very important performance parameter. Carbon potential determines the direction and limit of carbon transfer intensity, and reflects the ability of carbon to transfer from one phase to another. Therefore, it is necessary to detect the carbon potential in the carburizing process. The commonly used detection method is to use an oxygen probe to detect the oxygen partial pressure in the carbon-containing atmosphere, and then indirectly measure the carbon potential of the atmosphere in the carburizing furnace. If the gas concentration in the carburizing furnace is unevenly distributed, it will inevitably affect the measurement of carbon potential, resulting in inaccurate carbon potential data, and thus affecting product quality. Summary of the invention

[0004] The purpose of the utility model is to provide a carbon potential detection device for a carburizing furnace, which can solve the technical problems mentioned in the background technology.

[0005] In order to achieve the above-mentioned purpose, the technical scheme of the utility model is as follows: a carbon potential detection device for a carburizing furnace, comprising a carburizing furnace, a detection hole is provided on the side wall of the carburizing furnace, a detection transition tube connected to the detection hole is extended outward from the outer wall of the carburizing furnace, a nitrogen filling tube is provided on the side wall of the detection transition tube, a detection rod can be inserted into the detection transition tube, the head of the detection rod extends into the carburizing furnace and is provided with a placement rack for placing fixed carbon sheets, and the tail of the detection rod extends out of the detection transition tube.

[0006] Preferably, the detection transition tube is provided with a detection ball valve for controlling the opening or closing of the detection transition tube on the outer side of the nitrogen filling tube, and when the detection transition tube is in an open state, the detection rod can pass through the detection ball valve.

[0007] Preferably, the distance between the detection ball valve and the detection hole is greater than the length of the placement rack.

[0008] Preferably, a threaded portion is provided at the outer end of the detection transition tube, and a sealing cover is slidably and sealably provided on the outer portion of the detection rod extending out of the detection transition tube, and the sealing cover is threadably connected to the threaded portion.

[0009] Preferably, a hand-held portion is provided at the tail end of the detection rod.

[0010] Preferably, the nitrogen filling pipe is provided with a nitrogen filling ball valve for controlling the opening or closing of the nitrogen filling pipe.

[0011] Preferably, the placement rack is spiral-shaped.

[0012] Compared with the prior art, the utility model has the following beneficial effects: the utility model cools the fixed carbon sheet through the detection transition tube, and during the cooling process, nitrogen is filled into the detection transition tube through the nitrogen filling tube to prevent the fixed carbon sheet from being oxidized. After the fixed carbon sheet is cooled, it is taken out and weighed, and the carbon potential is calculated based on the initial weight and final weight of the fixed carbon sheet. The carbon potential data is accurate, and the quality of the product is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0015] like Figure 1 As shown, the utility model provides a carbon potential detection device for a carburizing furnace, comprising a carburizing furnace 1, a detection hole 2 is provided on the side wall of the carburizing furnace 1, a detection transition pipe 3 connected to the detection hole 2 is extended outward from the outer wall of the carburizing furnace 1, a nitrogen filling pipe 4 is provided on the side wall of the detection transition pipe 3, the nitrogen filling pipe 4 is connected to a nitrogen gas source, a detection rod 5 can be inserted into the detection transition pipe 3, the head of the detection rod 5 extends into the carburizing furnace 1 and is provided with a placement rack 6 for placing fixed carbon sheets, and the tail of the detection rod 5 extends out of the detection transition pipe 3.

[0016] When the utility model is used, the fixed carbon sheet is first weighed to obtain an initial weight W0, and then the fixed carbon sheet is placed on the placement rack 6 of the detection rod 5. The placement rack 6 with the fixed carbon sheet extends from the detection transition tube 3 and the detection hole 2 into the carburizing furnace 1, and part of the detection rod 5 is located in the detection transition tube 3, and part of the detection rod 5 is located outside the detection transition tube 3. After the fixed carbon sheet is placed in the carburizing furnace 1 for 20-30 minutes, the detection rod 5 is pulled outward until the placement rack 6 and the fixed carbon sheet are located in the detection transition tube 3, and the fixed carbon sheet is cooled in the detection transition tube 3. During the cooling process, nitrogen is filled into the detection transition tube 3 through the nitrogen filling tube 4. Nitrogen can prevent the fixed carbon sheet from being oxidized. After the cooling is completed, the detection rod 5 is pulled outward again until the placement rack 6 and the fixed carbon sheet are taken out of the detection transition tube 3, and the fixed carbon sheet is taken out of the placement rack 6 and weighed to obtain the final weight W1. According to the formula C p = (W1-W0) / W1×100%+C0 (where: C PThe carbon potential is calculated by C0, which is the carbon potential value (C%) and the original carbon content of the carbon sheet (C%). The carbon potential data is accurate to ensure the quality of the product.

[0017] Preferably, the detection transition pipe 3 is provided with a detection ball valve 7 for controlling the opening or closing of the detection transition pipe 3 on the outer side of the nitrogen filling pipe 4. When the detection transition pipe 3 is in an open state, the detection rod 5 can pass through the detection ball valve 7. When it is necessary to detect the carbon potential, the detection ball valve 7 is rotated to open the detection transition pipe 3, and the detection rod 5, the placement rack 6 and the fixed carbon sheet can pass through the detection ball valve 7 and extend into the carburizing furnace 1. When it is not necessary to detect the carbon potential, after taking out the detection rod 5, the detection ball valve 7 can be rotated again to close the detection transition pipe 3 to prevent the gas in the carburizing furnace 1 from escaping.

[0018] Preferably, the distance between the detection ball valve 7 and the detection hole 2 is greater than the length of the placement rack 6, so that the placement rack 6 and the fixed carbon sheet are completely received in the detection transition pipe 3 and cooled.

[0019] Preferably, the outer end of the detection transition tube 3 is provided with a threaded portion, and the portion of the detection rod 5 extending outside the detection transition tube 3 is provided with a sealing cover 8 for sliding sealing, and the sealing cover 8 is threadedly connected to the threaded portion. Due to the sliding sealing arrangement of the sealing cover 8 and the detection rod 5, when the detection rod 5 is inserted into the detection transition tube 3 and the sealing cover 8 is threadedly connected to the detection transition tube 3, the detection rod 5 can be freely pulled in the sealing cover 8 and the detection transition tube 3, and the sealing cover 8 is sealed on the outer end of the detection transition tube 3 and slidably sealed on the detection rod 5, which can prevent the gas in the carburizing furnace 1 and the gas filled in the nitrogen filling tube 4 from escaping.

[0020] Preferably, a hand-held portion 9 is provided at the tail end of the detection rod 5, and the detection rod 5 can be operated by holding the hand-held portion 9, which is convenient to operate.

[0021] Preferably, the nitrogen filling pipe 4 is provided with a nitrogen filling ball valve 10 for controlling the opening or closing of the nitrogen filling pipe 4. When nitrogen needs to be filled, the nitrogen filling ball valve 10 is turned to open the nitrogen filling pipe 4, and nitrogen can be filled. When nitrogen does not need to be filled, the nitrogen filling ball valve 10 is turned again to close the nitrogen filling pipe 4, and nitrogen cannot be filled, thereby avoiding waste.

[0022] Preferably, the placement rack 6 is in a spiral shape, and the fixed carbon sheet is placed in the spiral shape for placement.

[0023] Although the implementation scheme of the utility model has been disclosed as above, it is not limited to the applications listed in the specification and the implementation scheme. It can be fully applied to various fields suitable for the utility model. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A carbon potential detection device for a carburizing furnace, comprising a carburizing furnace, a detection hole being provided on a side wall of the carburizing furnace, characterized in that: A detection transition tube connected to the detection hole is extended outward from the outer wall of the carburizing furnace, and a nitrogen filling tube is provided on the side wall of the detection transition tube. A detection rod can be inserted into the detection transition tube, and the head of the detection rod extends into the carburizing furnace and is provided with a placement rack for placing fixed carbon sheets, and the tail of the detection rod extends out of the detection transition tube.

2. The carbon potential detection device of the carburizing furnace according to claim 1, characterized in that: The detection transition pipe is provided with a detection ball valve for controlling the opening or closing of the detection transition pipe on the outer side of the nitrogen filling pipe. When the detection transition pipe is in an open state, the detection rod can pass through the detection ball valve.

3. The carbon potential detection device of the carburizing furnace according to claim 2, characterized in that: The distance between the detection ball valve and the detection hole is greater than the length of the placement rack.

4. The carbon potential detection device for a carburizing furnace according to any one of claims 1 to 3, characterized in that: The outer end of the detection transition tube is provided with a threaded portion, and the portion of the detection rod extending out of the detection transition tube is slidably and sealably provided with a sealing cover, which is threadedly connected with the threaded portion.

5. The carbon potential detection device for a carburizing furnace according to any one of claims 1 to 3, characterized in that: A hand-holding portion is provided at the tail end of the detection rod.

6. The carbon potential detection device for a carburizing furnace according to any one of claims 1 to 3, characterized in that: The nitrogen filling pipe is provided with a nitrogen filling ball valve for controlling the opening or closing of the nitrogen filling pipe.

7. The carbon potential detection device for a carburizing furnace according to any one of claims 1 to 3, characterized in that: The placement rack is in a spiral shape.

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