Device for reducing oxidation in resistance furnace

Abstract

The utility model provides a device for reducing oxidation in a resistance furnace, which belongs to the field of heat treatment and comprises a nitrogen gas introduction path and a propane gas introduction path, the nitrogen introduction path comprises a nitrogen pipeline, and nitrogen is introduced through the inlet end of the nitrogen pipeline; the propane gas introduction path comprises a propane gas pipeline and a control device, propane gas is introduced through the inlet end of the propane gas pipeline, and the control device is arranged at the outlet end of the propane gas pipeline and used for adjusting the gas output of the propane gas; nitrogen conveyed by the nitrogen pipeline and propane conveyed by the propane gas pipeline are gathered through the mixed gas pipeline to form mixed gas, and the mixed gas is output to the resistance furnace. The resistance furnace has the advantages that residual oxygen in the resistance furnace is consumed while safety is guaranteed through mixed gas of propane gas and nitrogen gas, oxidation reaction between the surface of a workpiece and oxygen is prevented in production, the machined workpiece is stable in performance, the surface appearance is not abnormal, and the output quality is improved.

Description

Technical Field

[0001] The utility model belongs to the field of heat treatment, in particular to a device for reducing oxidation in a resistance furnace. Background Art

[0002] When the workpiece after heat treatment is annealed at high temperature, since there is oxygen inside the resistance furnace, the surface of the workpiece undergoes an oxidation reaction with the oxygen in the resistance furnace under high temperature, causing the surface of the workpiece to oxidize, affecting the performance and surface appearance of the workpiece after heat treatment. If only nitrogen is introduced to prevent the workpiece from oxidizing, oxygen will still remain in the resistance furnace. Therefore, a device for reducing oxidation in the resistance furnace is proposed. Utility Model Content

[0003] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a device for reducing oxidation in a resistance furnace. Through a mixed gas of propane gas and nitrogen, the residual oxygen in the resistance furnace is consumed while ensuring safety. During the production process, the oxidation reaction between the workpiece surface and oxygen is prevented, and the oxidized surface of the workpiece can be restored, so that the performance of the processed workpiece is stable, the surface appearance is normal, and the output quality is improved.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a device for reducing oxidation in a resistance furnace, comprising a nitrogen gas introduction path and a propane gas introduction path;

[0005] The nitrogen gas introduction path includes a nitrogen gas pipeline, and nitrogen gas is introduced through the inlet end of the nitrogen gas pipeline;

[0006] The propane gas introduction path includes a propane gas pipeline and a control device, the propane gas is introduced through the inlet end of the propane gas pipeline, and the control device is arranged at the outlet end of the propane gas pipeline for adjusting the gas output of the propane gas;

[0007] The nitrogen gas transported by the nitrogen pipeline and the propane gas transported by the propane pipeline are collected through the mixed gas pipeline to form a mixed gas, which is output to the resistance furnace.

[0008] Furthermore, the control device includes a coarse regulating valve connected to the outlet end of the propane gas pipeline and a fine regulating valve connected in parallel to the coarse regulating valve.

[0009] Furthermore, a proportional valve is provided on the mixed gas pipeline to control the proportion of the mixed gas entering the resistance furnace.

[0010] Furthermore, the outlet end of the mixed gas pipeline is communicated with the lower part of the inlet of the resistance furnace, and a PLC oxygen content analyzer is arranged on the resistance furnace to monitor the oxygen content in the resistance furnace.

[0011] Furthermore, the nitrogen introduction path includes an A regulating device and an A monitoring device which are sequentially arranged at the inlet end of the nitrogen pipeline, the A regulating device is used to regulate the pressure of the nitrogen, and the A monitoring device is used to monitor the values ​​of the nitrogen pressure and flow.

[0012] Furthermore, the propane gas introduction path includes a B regulating device and a B monitoring device which are sequentially arranged at the inlet end of the propane gas pipeline, the B regulating device is used to regulate the gas pressure of the propane gas, and the B monitoring device is used to monitor the values ​​of the gas pressure and flow of the propane gas.

[0013] Furthermore, a propane gas cylinder is connected to the inlet end of the propane gas pipeline.

[0014] Furthermore, the A regulating device adopts an A pressure regulator, and the A monitoring device includes an A pressure gauge and an A flow meter which are arranged in sequence.

[0015] Furthermore, the B regulating device adopts a B pressure regulator, and the B monitoring device includes a B pressure gauge and a B flow meter which are arranged in sequence.

[0016] The advantages and positive effects of the utility model are:

[0017] 1. Due to the adoption of the above technical solution, propane gas is used to consume the residual oxygen inside the resistance furnace. In order to avoid the risk of explosion of propane gas, nitrogen is introduced at the same time as the propane gas. The mixed gas produced by propane gas and nitrogen can consume the oxygen in the resistance furnace, avoiding oxidation reaction and excluding the risk of explosion.

[0018] 2. The control device in the propane gas introduction path can accurately control the amount of propane gas introduced through the cooperation of the coarse regulating valve and the fine regulating valve, so that the propane gas and nitrogen reach the set ratio.

[0019] 3. The PLC oxygen content analyzer can monitor the oxygen content in the resistance furnace in real time. According to the monitored value, the opening size of the proportional valve is adjusted to control the proportion of the mixed gas entering the resistance furnace.

[0020] 4. The A regulating device and the A monitoring device of the nitrogen gas introduction path can control the amount of nitrogen gas introduced. The B regulating device and the B monitoring device of the propane gas introduction path can control the amount of propane gas introduced. The setting of the proportional valve can control the ratio of nitrogen gas to propane gas introduced into the resistance furnace. Through the above structure, the ratio of each link can be adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the utility model.

[0022] In the figure:

[0023] 1. Nitrogen pipeline; 11. A pressure regulator; 12. A pressure gauge; 13. A flow meter;

[0024] 2. Propane gas pipeline; 21. Propane gas cylinder; 22. B pressure regulator; 23. B pressure gauge; 24. B flow meter; 25. Coarse regulating valve; 26. Fine regulating valve;

[0025] 3. Mixed gas pipeline; 31. Proportional valve;

[0026] 4. Resistance furnace; 41. PLC oxygen content analyzer. DETAILED DESCRIPTION

[0027] The utility model is further described below in conjunction with embodiments and drawings.

[0028] like Figure 1 As shown, this embodiment provides a device for reducing oxidation in a resistance furnace, including a nitrogen gas introduction path and a propane gas introduction path;

[0029] The nitrogen introduction path includes a nitrogen pipeline 1, and nitrogen is introduced through the inlet end of the nitrogen pipeline 1. It also includes an A regulating device and an A monitoring device arranged in sequence at the inlet end of the nitrogen pipeline 1. The A regulating device is used to adjust the pressure of the nitrogen and is suitable for pipeline transportation. The A monitoring device is used to monitor the values ​​of the nitrogen pressure and flow.

[0030] In this embodiment, the A regulating device adopts an A pressure regulator 11, and the A monitoring device includes an A pressure gauge 12 and an A flow meter 13 which are arranged in sequence.

[0031] The propane gas introduction path includes a propane gas pipeline 2 and a control device. The propane gas is introduced through the inlet end of the propane gas pipeline 2. The control device is arranged at the outlet end of the propane gas pipeline 2 and is used to adjust the gas output of the propane gas. The control device includes a coarse regulating valve 25 and a fine regulating valve 26 connected in parallel to the coarse regulating valve 25, that is, the fine regulating valve 26 is arranged on the pipeline, and the two ends of the pipeline are respectively connected to the propane gas pipeline 2 on both sides of the coarse regulating valve 25. Through the adjustment of the double regulating valves, the flow rate of the propane gas passing through is made more accurate.

[0032] The propane gas introduction path also includes a B regulating device and a B monitoring device which are sequentially arranged at the inlet end of the propane gas pipeline 2. The B regulating device is used to regulate the gas pressure of the propane gas and is suitable for pipeline transportation. The B monitoring device is used to monitor the values ​​of the propane gas pressure and flow.

[0033] A propane gas cylinder 21 is connected to the inlet end of the propane gas pipeline 2 for providing propane gas.

[0034] In this embodiment, the B regulating device adopts a B pressure regulator 22, and the B monitoring device includes a B pressure gauge 23 and a B flow meter 24 which are arranged in sequence.

[0035] The outlet end of the nitrogen pipeline 1 and the outlet end of the propane gas pipeline 2 are both connected to the inlet end of the mixed gas pipeline 3, and the outlet end of the mixed gas pipeline 3 is connected to the lower half of the inlet of the resistance furnace 4, that is, connected to the lower middle part of the resistance furnace 4, so that the nitrogen transported by the nitrogen pipeline 1 and the propane gas transported by the propane gas pipeline 2 are combined through the mixed gas pipeline 3 to form a mixed gas, which is transported to the resistance furnace 4.

[0036] A proportional valve 31 is provided on the mixed gas pipeline 3 for controlling the proportion of the mixed gas entering the resistance furnace 4 . A PLC oxygen content analyzer 41 is connected to the resistance furnace 4 for monitoring the oxygen content in the resistance furnace 4 .

[0037] The working process of this example:

[0038] Nitrogen is introduced through the inlet end of the nitrogen pipeline 1. The pressure in the nitrogen pipeline 1 can be adjusted by the A pressure regulator 11 according to the value displayed by the A pressure gauge 12. The amount of nitrogen introduced can be displayed by the A flow meter 13.

[0039] The propane gas cylinder 21 passes the propane gas into the propane gas pipeline 2. The gas pressure in the propane gas pipeline 2 can be adjusted by the B pressure regulator 22 according to the value displayed by the B pressure gauge 23. The amount of propane gas introduced can be displayed by the B flow meter 24. The amount of propane gas introduced can be adjusted according to the usage. The coarse regulating valve 25 is used to roughly adjust the amount of propane gas introduced, and the fine regulating valve 26 is used to finely adjust the amount of propane gas introduced;

[0040] Nitrogen and propane gas are gathered through the mixed gas pipeline 3 to form a mixed gas, which is introduced from the bottom of the entrance of the resistance furnace 4. The mixed gas is filled into the resistance furnace 4 from bottom to top and is fully mixed with the gas in the resistance furnace 4. The propane gas in the mixed gas can consume the residual oxygen in the resistance furnace 4 to ensure that the workpiece does not come into contact with oxygen. The PLC oxygen content analyzer 41 can monitor in real time whether there is oxygen in the resistance furnace 4, and control the opening size of the proportional valve 31 through its value to adjust the amount of mixed gas introduced.

[0041] The above describes one or more embodiments of the utility model in detail, but the above contents are only preferred embodiments of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of application of the utility model shall still fall within the scope of the patent coverage of the utility model.

Claims

1. A device for reducing oxidation in a resistance furnace, characterized in that: including a nitrogen gas inlet path and a propane gas inlet path; The nitrogen introduction path comprises a nitrogen pipeline (1), and nitrogen is introduced through the inlet end of the nitrogen pipeline (1); The propane gas introduction path comprises a propane gas pipeline (2) and a control device, the propane gas is introduced through the inlet end of the propane gas pipeline (2), and the control device is arranged at the outlet end of the propane gas pipeline (2) and is used to adjust the gas output of the propane gas; The nitrogen gas delivered by the nitrogen pipeline (1) and the propane gas delivered by the propane pipeline (2) are collected through the mixed gas pipeline (3) to form a mixed gas, which is then output to the resistance furnace (4).

2. A device for reducing oxidation in a resistance furnace according to claim 1, characterized in that: The control device comprises a coarse regulating valve (25) connected to the outlet end of the propane gas pipeline (2) and a fine regulating valve (26) connected in parallel to the coarse regulating valve (25).

3. The device for reducing oxidation in a resistance furnace according to claim 1, characterized in that: A proportional valve (31) is provided on the mixed gas pipeline (3) for controlling the proportion of the mixed gas entering the resistance furnace (4).

4. A device for reducing oxidation in a resistance furnace according to claim 3, characterized in that: The outlet end of the mixed gas pipeline (3) is connected to the lower part of the inlet of the resistance furnace (4), and a PLC oxygen content analyzer (41) is arranged on the resistance furnace (4) for monitoring the oxygen content in the resistance furnace (4).

5. The device for reducing oxidation in a resistance furnace according to claim 1, characterized in that: The nitrogen inlet path comprises an A regulating device and an A monitoring device which are sequentially arranged at the inlet end of the nitrogen pipeline (1), wherein the A regulating device is used to regulate the nitrogen pressure, and the A monitoring device is used to monitor the values ​​of the nitrogen pressure and flow rate.

6. The device for reducing oxidation in a resistance furnace according to claim 1, characterized in that: The propane gas inlet path comprises a B regulating device and a B monitoring device which are sequentially arranged at the inlet end of the propane gas pipeline (2), wherein the B regulating device is used to regulate the gas pressure of the propane gas, and the B monitoring device is used to monitor the values ​​of the gas pressure and flow rate of the propane gas.

7. The device for reducing oxidation in a resistance furnace according to claim 1, characterized in that: A propane gas cylinder (21) is connected to the inlet end of the propane gas pipeline (2).

8. The device for reducing oxidation in a resistance furnace according to claim 5, characterized in that: The A regulating device adopts an A pressure regulator (11), and the A monitoring device comprises an A pressure gauge (12) and an A flow meter (13) which are arranged in sequence.

9. The device for reducing oxidation in a resistance furnace according to claim 6, characterized in that: The B regulating device adopts a B pressure regulator (22), and the B monitoring device comprises a B pressure gauge (23) and a B flow meter (24) which are arranged in sequence.

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