CN115248094A - Off-line air tightness detection system and detection method for RH vacuum tank - Google Patents
Off-line air tightness detection system and detection method for RH vacuum tank Download PDFInfo
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- CN115248094A CN115248094A CN202110455883.5A CN202110455883A CN115248094A CN 115248094 A CN115248094 A CN 115248094A CN 202110455883 A CN202110455883 A CN 202110455883A CN 115248094 A CN115248094 A CN 115248094A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/32—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
- G01M3/3236—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers
- G01M3/3272—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers for verifying the internal pressure of closed containers
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Abstract
The invention relates to an off-line air tightness detection system for an RH vacuum groove. The air charging device is used for controlling the vacuum tank to be charged with compressed air with certain pressure and is connected with a vacuum tank circulation air pipe on the impregnation pipe; the pressure gauge is used for detecting the pressure in the vacuum tank, the detection precision is not less than 0.01MPa, and the pressure gauge is arranged on a notch sealing device at the upper part of the vacuum tank; the vacuum groove sealing device is used for sealing the vacuum groove during detection. According to the technical scheme, whether the vacuum groove body leaks or not is identified and judged by skillfully comparing the key factor of the front and back pressure changes of the vacuum groove body under the condition of positive high-pressure sealing, and the leakage point is detected by a corresponding detection method and is timely processed to avoid the leakage condition after the vacuum groove is used online.
Description
Technical Field
The invention relates to a detection system, in particular to an off-line air tightness detection system for an RH vacuum groove, and belongs to the technical field of converter steelmaking.
Background
The vacuum degree in the RH furnace treatment process does not reach the standard, and various factors are involved, wherein any factor can influence the vacuum degree mainly comprises a vacuum system behind a vacuum main valve such as steam, cooling water, a vacuum pump and the like, and a system in front of the vacuum main valve such as an alloy vacuum hopper, a blanking pipeline, an air cooler, a vacuum groove body, a top gun seal, a vacuum detection instrument and the like. The vacuum system behind the vacuum main valve can be detected and found and solved by closing the vacuum main valve to perform degassing detection, and the prior technical scheme for detecting the leakage of the system in front of the vacuum main valve is to perform online detection by molten steel heat load test run, the leakage of a sealing part can be solved by replacing a sealing part and the like, but once the leakage of the vacuum groove body occurs, the problem cannot be immediately solved and treated due to high temperature and the like, and the vacuum groove cannot treat special steel with high requirement on vacuum degree during the service period of the wire groove, so that impact is caused to production. Especially, the leakage of the welding seam at the connection part of the dip pipe is extremely difficult to find, and can cause the production accident of pipe penetration in the process of treating molten steel.
Through searching patent documents, the CN201310726963, which is a system inspection method for RH furnace vacuum degree not reaching the standard, is found to be used for inspecting in the process of RH strip steel hydrothermal test in order to reduce the influence of vacuum groove body leakage on the RH treatment process, and the specific method is as follows: whether the upper, middle and lower joint surfaces and flanges of the vacuum groove body leak or not is specifically adopted: the inspectors feel the gas flow at the joint surfaces of the flanges through hand feeling, and the leakage is judged. The patent requires that the leakage of the vacuum tank body is checked under the condition that molten steel is used on the vacuum tank line, and the leakage of the vacuum tank body cannot be prevented in advance; CN 201811355597-a circulating pipe gas leakage detection device for RH refining furnace vacuum tank, wherein the cooling device is added with the circulating pipe gas leakage detection device at the RH furnace off-line baking position, the cooling device carries out the gas leakage detection of the circulating pipe, and the sealing detection of the connecting flange of the upper tank and the lower tank of the vacuum tank body, an alloy turning plate water tank, the welding position of a dip pipe and the like is not carried out.
In view of the above situation, there is a need to develop a vacuum tank offline detection technology based on the currently commonly adopted online detection vacuum tank sealing mode. The method aims to find the sealing leakage of a vacuum tank body, a flange, a dip pipe welding part and the like under the condition that the vacuum tank is not repaired and used online, and can effectively treat the leakage in time. Therefore, the problems that the vacuum degree does not reach the standard and the production accidents are caused because the sealing leakage is difficult to find or the accurate and quick treatment cannot be realized after the vacuum groove is used on line are solved.
Disclosure of Invention
The invention provides an RH vacuum groove off-line air tightness detection system aiming at the problems in the prior art, the technical scheme is that the system and the method for detecting the air tightness of the RH vacuum groove before the RH vacuum groove is on line are provided aiming at the problem that the leakage of the vacuum groove body which can be found only after the existing vacuum groove is on line baked for use, when the vacuum groove body has a leakage point, the main phenomenon is that air enters the vacuum groove along with the leakage point of the vacuum groove body during the vacuumizing process in the processing process, the vacuum degree of the vacuum groove is reduced slowly or the vacuum degree requirement can not be met; meanwhile, the phenomenon that air enters from a leakage point and is equivalent to oxygen blowing is caused, and production accidents are caused. According to the technical scheme, whether the vacuum groove body leaks or not is identified and judged by skillfully comparing the key factor of the front and back pressure changes of the vacuum groove body under the condition of positive high-pressure sealing, and the leakage point is detected by a corresponding detection method and is timely processed to avoid the leakage condition after the vacuum groove is used online.
In order to achieve the above purpose, the technical solution of the present invention is that the system for detecting the off-line air tightness of the RH vacuum tank is characterized in that the system comprises a vacuum tank sealing device, an air charging device 6 and a pressure gauge M. The air charging device is used for controlling the vacuum tank to be charged with compressed air with certain pressure and is connected with a vacuum tank circulation air pipe on the impregnation pipe; the pressure gauge M is used for detecting the pressure in the vacuum groove, the detection precision of the pressure gauge M is not less than 0.01MPa, and the pressure gauge M is arranged on a sealing device of a notch at the upper part of the vacuum groove.
As an improvement of the invention, the vacuum groove sealing device is used for sealing the vacuum groove and comprises a lifting trolley 4, a dip pipe sealing washer 5, an upper notch sealing device 7 and an alloy chute port sealing device 8.
A detection method of an RH vacuum groove off-line air tightness detection system comprises the following steps:
step 1: sealing the vacuum groove;
step 2: inflating the vacuum groove;
and 3, step 3: detecting the sealing of the vacuum groove;
and 4, step 4: and (5) performing air leakage treatment on the vacuum tank.
Further, the step 1: sealing the vacuum groove; the method comprises the following specific steps:
1.1, hanging the assembled vacuum groove after the building is finished on a detection frame;
1.2, sealing an alloy chute inlet and an upper notch of the vacuum groove with a sealing gasket through a blind plate, wherein the blind plate clamping bolts of the upper notch are uniformly arranged and the space between the blind plate clamping bolts is not more than 200mm;
1.3, using a lifting trolley to jack the sealing gasket prepared on the lifting platform to the dipping pipe of the vacuum tank so as to seal the mouth of the dipping pipe. Further, step 2: and (3) inflating the vacuum tank, specifically comprising the following steps:
2.1 the circulating air pipe of the dip pipe is butted with the compressed air pipeline, and the pressure in the vacuum tank is P 0 ；
2.2 opening the compressed air control valve to charge the vacuum tank with air to a pressure P 1 ，P 1 -P 0 When the pressure is higher than 0.1MPa, the compressed air control valve is closed;
2.3 after the vacuum groove is sealed and detected, the compressed air control valve is opened again to charge air into the vacuum groove to the pressure P 2 Wherein the pressure increasing speed is 0.01MPa/min, P 2 -P 0 And when the pressure is more than 0.15MPa, closing the compressed air control valve.
Further, step 3: and (3) detecting the sealing of the vacuum groove, which comprises the following steps:
3.1 in vacuum tank pressure P 1 Then, detecting the air leakage of the welding line connecting the dip pipe and the vacuum tank by using detection liquid;
3.2 pressure P in vacuum vessel 1 When the vacuum tank is used, the joint of the upper part and the lower part of the vacuum tank is sealed by using detection liquid to detect air leakage;
3.3 pressure P in vacuum vessel 1 When in use, the detection liquid is used for sealing the cylinder part of the alloy turning plate of the vacuum tank to detect air leakage;
3.4 at vacuum tank pressure P 2 During the test, the compressed air control valve is closed to perform pressure maintaining detection, and the display value P of the pressure gauge is detected after 30 minutes 3 ，P 2 -P 3 Qualified when the pressure is less than or equal to 0.01 MPa;
3.5 at vacuum tank pressure P 2 During the test, the compressed air control valve is closed to perform pressure maintaining detection, and the display value P of the pressure gauge is detected after 30 minutes 3 ，P 2 -P 3 If the pressure is more than 0.01MPa, the product is unqualified. Indicating that the vacuum tank has a leakage point, repeating the steps from 3.1 toAnd 3.3, detecting again and checking an air leakage point.
Further, step 4: the air leakage treatment of the vacuum tank comprises the following specific steps:
4.1 after checking out the air leakage point, marking, descending the lifting trolley, and decompressing the vacuum tank;
4.2 if the welding seam of the dipping pipe and the vacuum tank leaks air, performing repair welding treatment on the air leakage part;
4.3 if the joint of the upper part and the lower part of the vacuum groove is sealed and air leaks, the sealing washer is replaced;
4.4 if the alloy turning plate cylinder part of the vacuum groove is sealed, replacing the sealing washer;
4.5 after the vacuum tank air leakage treatment is finished, step 2 and step 3 are executed again.
Compared with the prior art, the invention has the following advantages that 1) the invention provides an off-line tightness detection system and method for the RH vacuum groove, the technical scheme ensures the assembly quality of the vacuum groove and the tightness of the shell, successfully realizes the detection of the leakage point of the vacuum groove before use, solves the problem that the leakage point can be found and is difficult to dispose only after the vacuum groove is used, successfully eliminates the related operation of detecting whether the leakage point exists in the vacuum groove when the vacuum degree is detected when the RH vacuum groove of a steel mill is used at the first furnace, and provides powerful support for quickly finding the reason when the vacuum degree does not reach the standard; 2) According to the technical scheme, the leakage point of the vacuum tank is quickly detected by skillfully utilizing the pressure difference change of the closed container, so that the process accident that the vacuum degree does not reach the standard is avoided; 5363 and in the experimental stage of steelmaking in a Mei Gang steel plant, the technical scheme is used to successfully realize that no leakage point exists on the vacuum groove and the reason can be checked within 20 minutes after the vacuum degree does not reach the standard. Because the sealing performance of the vacuum groove is ensured, the vacuum degree of the vacuum groove is intact in the production and use processes, the RH process level is greatly improved, and the production efficiency is obviously improved; 3) The technical scheme also solves the problem of quality detection of the welding seam between the vacuum tank immersion pipe and the circulating pipe, and prevents the production accident of penetration and leakage of the immersion pipe caused by leakage in the treatment process of the part.
Drawings
FIG. 1 is a schematic view of a seal detection system;
FIG. 2 is a schematic view of the overall process of the present invention.
In fig. 1: 1-vacuum tank 2-dip pipe 3-alloy chute 4-lifting trolley 5-dip pipe sealing washer 6-aerating device
7-upper notch sealing device 8-alloy chute mouth sealing device.
The specific implementation mode is as follows:
for the purpose of enhancing an understanding of the present invention, the present embodiment will be described in detail below with reference to the accompanying drawings.
Example 1: referring to fig. 1, the system for detecting the off-line air tightness of the RH vacuum tank comprises a vacuum tank sealing device, an air charging device 6 and a pressure gauge M. The air charging device is used for controlling the vacuum tank to be charged with compressed air with certain pressure and is connected with a vacuum tank circulation air pipe on the impregnation pipe; the pressure gauge M is used for detecting the pressure in the vacuum tank, the detection precision of the pressure gauge M is not less than 0.01MPa, and the pressure gauge M is arranged on a notch sealing device at the upper part of the vacuum tank; the vacuum groove sealing device is used for sealing the vacuum groove and comprises a lifting trolley 4, a dip pipe sealing washer 5, an upper notch sealing device 7 and an alloy chute port sealing device 8.
Example 2: referring to fig. 1, a detection method of an off-line RH vacuum chamber airtightness detection system includes the following steps:
step 1: sealing the vacuum groove;
step 2: inflating the vacuum tank;
and step 3: detecting the sealing of the vacuum groove;
and 4, step 4: and (5) carrying out air leakage treatment on the vacuum tank.
The step 1: sealing the vacuum groove; the method comprises the following specific steps:
1.1, hanging the assembled vacuum groove after the building is finished on a detection frame;
1.2, sealing an alloy chute inlet and an upper notch of the vacuum groove with a sealing gasket through a blind plate, wherein the blind plate clamping bolts of the upper notch are uniformly arranged and the space between the blind plate clamping bolts is not more than 200mm;
and 1.3, using a lifting trolley to align a sealing gasket prepared on a lifting platform with a dipping pipe of the vacuum tank for jacking so as to seal the mouth of the dipping pipe. Step 2: and (3) inflating the vacuum tank, specifically as follows:
2.1 the circulating air pipe of the dip pipe is butted with the compressed air pipeline, and the pressure in the vacuum tank is P 0 ；
2.2 opening the compressed air control valve to charge the vacuum tank with air to a pressure P 1 ，P 1 -P 0 When the pressure is higher than 0.1MPa, the compressed air control valve is closed;
2.3 after the vacuum groove is sealed and detected, the compressed air control valve is opened again, and the vacuum groove is inflated to the pressure P 2 Wherein the pressure increasing speed is 0.01MPa/min, P 2 -P 0 When the pressure is more than 0.15MPa, the compressed air control valve is closed.
And step 3: and (3) detecting the sealing of the vacuum groove, which comprises the following steps:
3.1 in vacuum tank pressure P 1 Then, detecting the air leakage of the welding line connecting the dip pipe and the vacuum tank by using detection liquid;
3.2 at vacuum tank pressure P 1 When the vacuum tank is used, the joint of the upper part and the lower part of the vacuum tank is sealed by using detection liquid to detect air leakage;
3.3 pressure P in vacuum vessel 1 When in use, the detection liquid is used for sealing the cylinder part of the alloy turning plate of the vacuum tank to detect air leakage;
3.4 at vacuum tank pressure P 2 During the test, the compressed air control valve is closed to perform pressure maintaining detection, and the display value P of the pressure gauge is detected after 30 minutes 3 ，P 2 -P 3 Qualified when the pressure is less than or equal to 0.01 MPa;
3.5 pressure P in vacuum vessel 2 When the pressure is detected, the compressed air control valve is closed to perform pressure maintaining detection, and the display value P of the pressure gauge is detected after 30 minutes 3 ，P 2 -P 3 If the pressure is more than 0.01MPa, the product is unqualified. And (4) indicating that the vacuum tank has an air leakage point, repeatedly executing 3.1-3.3 to detect again, and checking the air leakage point.
And 4, step 4: the air leakage treatment of the vacuum tank comprises the following specific steps:
4.1 after detecting a gas leakage point, marking, descending the lifting trolley, and relieving pressure of the vacuum tank;
4.2 if the welding seam of the dipping pipe and the vacuum tank leaks air, performing repair welding treatment on the air leakage part;
4.3 if the joint of the upper part and the lower part of the vacuum groove is sealed and air leaks, the sealing washer is replaced;
4.4 if the alloy turning plate cylinder part of the vacuum groove is sealed, replacing the sealing washer;
4.5 after the air leakage treatment of the vacuum tank is finished, the step 2 and the step 3 are executed again.
The specific embodiment is as follows:
the present invention is further described in detail below with reference to an example, which is provided for illustration only and is not to be construed as limiting the invention.
Mei Gang Steel works, a 150tRH vacuum furnace, adopts a split vacuum tank which is combined up and down, and is used for producing steel grades with extremely strict requirements on vacuum degree and nitrogen components, such as ultra-low carbon steel, silicon deoxidized steel and the like. The technology is adopted to carry out the pre-line sealing detection control of the vacuum groove, and the implementation process is as follows:
1. after the completion of the installation of the lower tank, the upper tank, the circulating pipe and the immersion pipe is confirmed, the assembled vacuum tank is hung on a sealing detection frame.
2. Sealing the inlet of the alloy chute of the vacuum groove by using a blind plate, and pressing the upper notch by using a gland ring; and the bottom of the vacuum tank is provided with a lifting trolley, a sealing gasket prepared on a platform of the lifting trolley is aligned to the dipping pipe of the vacuum tank, and the vacuum tank is lifted up to be sealed.
3. Compressed air is connected to the air pipe of the circulating pipe.
4. And opening the air inlet hand valve to pressurize to 0.12MPa, and closing the hand valve.
5. And (4) carrying out leak source detection on the welding seam, the sealing surface, the cylinder and the like by using the detection liquid.
And 6, opening the air inlet hand valve after detecting no leakage point, boosting the pressure to 0.16MPa, closing the hand valve, and recording the pressure value.
After 7.30 minutes, the pressure gauge was checked, the pressure value was 0.16MPa, and the pressure difference between the front and rear was 0.
8. And (5) after the detection is finished, releasing the pressure, and removing the sealing device for online use.
It should be noted that the above-mentioned embodiments are not intended to limit the scope of the present invention, and all equivalent modifications and substitutions based on the above-mentioned technical solutions are within the scope of the present invention as defined in the claims.
Claims (7)
1. The off-line air tightness detection system for the RH vacuum groove is characterized by comprising a vacuum groove sealing device, an air charging device 6 and a pressure gauge M. The air charging device is used for controlling the vacuum tank to be charged with compressed air with certain pressure and is connected with a vacuum tank circulation air pipe on the impregnation pipe; the pressure gauge M is used for detecting the pressure in the vacuum groove, the detection precision of the pressure gauge M is not less than 0.01MPa, and the pressure gauge M is arranged on a sealing device of a notch at the upper part of the vacuum groove.
2. The system for detecting the off-line air tightness of the RH vacuum tank of claim 1, wherein the vacuum tank sealing device is used for sealing the vacuum tank and comprises a lifting trolley 4, a dip pipe sealing washer 5, an upper notch sealing device 7 and an alloy chute port sealing device 8.
3. The method for detecting the off-line airtightness detection system for the RH vacuum chamber according to claim 1 or 2, wherein the method comprises the steps of:
step 1: sealing the vacuum groove;
step 2: inflating the vacuum tank;
and 3, step 3: detecting the sealing of the vacuum groove;
and 4, step 4: and (5) carrying out air leakage treatment on the vacuum tank.
4. The detection method according to claim 3, wherein the step 1: sealing the vacuum groove; the method comprises the following specific steps:
1.1, hanging the assembled vacuum groove after the building is finished on a detection frame;
1.2, sealing an alloy chute inlet and an upper notch of the vacuum groove with a sealing gasket through a blind plate, wherein the blind plate clamping bolts of the upper notch are uniformly arranged and the space between the blind plate clamping bolts is not more than 200mm;
and 1.3, using a lifting trolley to align a sealing gasket prepared on a lifting platform with a dipping pipe of the vacuum tank for jacking so as to seal the mouth of the dipping pipe.
5. The detection method according to claim 3, characterized in that step 2: and (3) inflating the vacuum tank, specifically as follows:
2.1 the circulating air pipe of the dip pipe is butted with the compressed air pipeline, and the pressure in the vacuum tank is P 0 ；
2.2 opening the compressed air control valve to charge the vacuum tank with air to a pressure P 1 ，P 1 -P 0 When the pressure is higher than 0.1MPa, the compressed air control valve is closed;
2.3 after the vacuum groove is sealed and detected, the compressed air control valve is opened again, and the vacuum groove is inflated to the pressure P 2 Wherein the pressure increasing speed is 0.01MPa/min, P 2 -P 0 And when the pressure is more than 0.15MPa, closing the compressed air control valve.
6. The detection method according to claim 3, characterized in that step 3: and (3) detecting the sealing of the vacuum groove, which comprises the following steps:
3.1 pressure P in the vacuum vessel 1 Then, detecting the air leakage of the welding line connecting the dip pipe and the vacuum tank by using detection liquid;
3.2 pressure P in vacuum vessel 1 When the vacuum tank is used, the joint of the upper part and the lower part of the vacuum tank is sealed by using detection liquid to detect air leakage;
3.3 pressure P in vacuum vessel 1 When in use, the detection liquid is used for sealing the cylinder part of the alloy turning plate of the vacuum tank to detect air leakage;
3.4 at vacuum tank pressure P 2 During the test, the compressed air control valve is closed to perform pressure maintaining detection, and the display value P of the pressure gauge is detected after 30 minutes 3 ，P 2 -P 3 Qualified when the pressure is less than or equal to 0.01 MPa;
3.5 at vacuum tank pressure P 2 During the test, the compressed air control valve is closed to perform pressure maintaining detection, and the display value P of the pressure gauge is detected after 30 minutes 3 ，P 2 -P 3 If the pressure is more than 0.01MPa, the product is unqualified. And (3) repeatedly executing 3.1-3.3 to detect again to check the air leakage point.
7. The detection method according to claim 3, characterized in that step 4: the air leakage treatment of the vacuum tank comprises the following specific steps:
4.1 after detecting a gas leakage point, marking, descending the lifting trolley, and relieving pressure of the vacuum tank;
4.2 if the welding seam of the dipping pipe and the vacuum tank leaks air, performing repair welding treatment on the air leakage part;
4.3 if the joint of the upper part and the lower part of the vacuum groove is sealed and air leaks, the sealing washer is replaced;
4.4 if the alloy turning plate cylinder part of the vacuum groove is sealed, replacing the sealing washer;
4.5 after the vacuum tank air leakage treatment is finished, step 2 and step 3 are executed again.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117782471A (en) * | 2024-02-27 | 2024-03-29 | 中国重型机械研究院股份公司 | Device and method for detecting conduction capacity of argon blowing pipeline of RH vacuum tank dip pipe |
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2021
- 2021-04-26 CN CN202110455883.5A patent/CN115248094A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117782471A (en) * | 2024-02-27 | 2024-03-29 | 中国重型机械研究院股份公司 | Device and method for detecting conduction capacity of argon blowing pipeline of RH vacuum tank dip pipe |
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