CN111458080A - Vacuum device and method for detecting quality of welding seam - Google Patents
Vacuum device and method for detecting quality of welding seam Download PDFInfo
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- CN111458080A CN111458080A CN202010411886.4A CN202010411886A CN111458080A CN 111458080 A CN111458080 A CN 111458080A CN 202010411886 A CN202010411886 A CN 202010411886A CN 111458080 A CN111458080 A CN 111458080A
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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
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/12—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing elastic covers or coatings, e.g. soapy water
- G01M3/14—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing elastic covers or coatings, e.g. soapy water for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
- G01M3/145—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing elastic covers or coatings, e.g. soapy water for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for welds
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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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- Examining Or Testing Airtightness (AREA)
Abstract
The invention relates to a vacuum device for detecting the quality of a welding seam, which comprises a sealing base module, an observation module and a pneumatic detection module, wherein the sealing base module comprises a gravity adjusting plate and a sealing rubber strip, the sealing rubber strip is fixed on the lower surface of the gravity adjusting plate and is enclosed end to end, the sealing rubber strip and the gravity adjusting plate form a first detection cavity, and the center of the gravity adjusting plate is provided with a through hole; the observation module is a groove body forming a second detection cavity, one side of an opening of the observation module is hermetically connected with the gravity adjusting plate, and the second detection cavity is communicated with the first detection cavity through a through hole; the air pressure detection module comprises a vacuumizing module and a metering module. The invention has the beneficial effects that: the vacuum device and the method for detecting the quality of the welding seam have the advantages of being simple in structure, convenient to assemble and disassemble, easy to operate, high in universality, high in use flexibility, wide in application range, capable of being used when steel plates are spliced in an overlapping mode, capable of being used when the steel plates are butted or spliced by other sectional materials, and capable of being used along with the turnover of a construction area.
Description
Technical Field
The invention belongs to the field of steel structure construction, and particularly relates to a vacuum device and a detection method for detecting weld joint quality.
Background
In the field of steel structure construction, welding is the most important process, and the quality of the welding directly affects the safety of the structure, so the requirement for detecting the quality of the welding seam is increased day by day. At present, there are many methods for performing nondestructive testing on welding seams, such as UT flaw detection, ray, magnetic powder flaw detection, and the like. However, for the quality detection of the welding seam with only a single working face, especially for the ultra-long single-face welding seam (the accumulated length of the welding seam of a single bottom plate can reach several kilometers) of the bottom plate, the piston plate, the top plate and the like of the gas cabinet, the air tightness detection cannot be rapidly completed due to the limitation of the working conditions. For example, ultrasonic detection cannot identify the type of welding defect in the weld inspection, and is insufficient for the airtightness inspection. How to rapidly and effectively complete the welding airtightness detection of the bottom plate of the gas chamber becomes a task to be solved urgently.
Disclosure of Invention
In order to solve the technical problems, the invention provides a vacuum device and a detection method for detecting the quality of a welding seam.
The technical scheme adopted by the invention is as follows: a vacuum device for detecting the quality of a welding seam comprises,
the sealing base module comprises a gravity adjusting plate and a sealing rubber strip, the sealing rubber strip is fixed on the lower surface of the gravity adjusting plate and is enclosed end to end, the sealing rubber strip and the gravity adjusting plate form a first detection cavity, and a through hole is formed in the center of the gravity adjusting plate;
the observation module is a groove body forming a second detection cavity, observation glass is arranged on the observation module, one side of an opening of the observation module is hermetically connected with the gravity adjusting plate, and the second detection cavity is communicated with the first detection cavity through a through hole;
and the air pressure detection module is communicated with the second detection cavity, vacuumizes and detects the air pressure in the second detection cavity.
Preferably, the observation module comprises a surrounding side wall and observation glass matched with the side wall in shape, and the observation glass is arranged at the upper part of the side wall and is connected with the side wall in a sealing way;
preferably, the side walls are provided on their inner sides with inwardly projecting brackets, over which the sight glass is arranged.
Preferably, the through hole matches the shape of the side wall enclosure.
Preferably, the air pressure detection module comprises a vacuumizing module and a metering module, the vacuumizing module comprises a vacuum air pump and a vacuumizing connector which are connected with each other, the metering module comprises a vacuum meter and a detection connector which are connected with each other, and the vacuumizing connector and the detection connector both penetrate through the side wall of the observation module to be communicated with the second detection cavity.
Preferably, the vacuum air pump is connected with the vacuumizing connector through a hose, and an air pressure regulating valve is further connected between the vacuum air pump and the vacuumizing connector.
Preferably, the vacuum meter is connected with the detection connector through a vent pipe, and a detection air pressure regulating valve is further connected between the vacuum meter and the detection connector.
Preferably, the thickness of the gravity adjusting plate is not less than 6mm, and the thickness of the sealing rubber strip with elasticity is not less than 5 cm.
The method for detecting the quality of the welding seam by using the vacuum device for detecting the quality of the welding seam comprises the steps of covering one surface, provided with the sealing rubber strip, of the gravity adjusting plate on the welding seam to be detected, and observing whether bubbles gush out from the welding seam coated with the foaming reagent or not through observation glass under the condition that the air pressure detection module vacuumizes the first detection cavity and the second detection cavity.
The detection steps are as follows:
firstly, coating a foaming reagent on a welding line to be detected;
controlling the sealing base module to cover the welding line to be detected;
vacuumizing through an air pressure detection module, and detecting air pressure changes of the first detection cavity and the second detection cavity;
and observing whether bubbles emerge above the welding seam through the observation glass, thereby judging the quality of the welding seam to be detected.
Preferably, the foaming agent is a soap solution or a detergent solution.
The invention has the advantages and positive effects that: the vacuum device and the method for detecting the quality of the welding seam have the characteristics of simple structure, convenient assembly and disassembly, easy operation, strong universality, larger use flexibility and wide application range, can be used when steel plates are lapped and spliced, can be used when steel plates are butted or spliced by other sectional materials, and can also be circulated along with a construction area; the detection effect is obvious and sensitive, the detection device is convenient to process, the used materials are less, and the detection device can be repeatedly recycled.
Drawings
FIG. 1 is a schematic structural diagram of one embodiment of the present invention;
fig. 2 is a schematic cross-sectional structure of an embodiment of the present invention.
In the figure:
11. spliced steel plate 12, welding seam 21 and gravity adjusting plate
22. Sealing rubber strip 31, side wall 32 and observation glass
33. Bracket 41, vacuumizing connector 42 and air pressure regulating valve
43. Hose 44, vacuum air pump 45 and detection connector
46. Detection air pressure regulating valve 47, air pipe 48 and vacuum meter
Detailed Description
An embodiment of the present invention will be described below with reference to the drawings.
As shown in figure 1 and figure 2, the invention relates to a vacuum device for detecting the quality of a welding seam, which can be used for detecting the quality of the welding seam of a spliced steel plate.
The sealing base module comprises a gravity adjusting plate and a sealing rubber strip, the sealing rubber strip is fixed on the lower surface of the gravity adjusting plate and is closed in a closing mode, the sealing rubber strip can be closed along the edge of the gravity adjusting plate according to the shape of the gravity adjusting plate, or can be closed into a round shape, an oval shape or a rectangular shape within the range of the bottom surface of the gravity adjusting plate, or can be closed into a long strip shape, and the shape of a welding line is matched conveniently; a groove formed by the sealing rubber strip and the gravity adjusting plate is a first detection cavity; gravity regulating plate thickness is not less than 6mm, has elastic joint strip thickness and is not less than 5cm, has elastic joint strip airtight laminating with the steel sheet below under the oppression of the great gravity regulating plate of weight, when the steel sheet has flaw or welding seam position has arch or sunken, defect is filled in to accessible joint strip's deformation for it is airtight to detect the intracavity, produces a large amount of gas leakage when avoiding the evacuation, influences the detection effect. In addition, when arch or sunken great, only rely on gravity regulating plate own weight not enough to make first detection chamber airtight, when needing again with the help of external gravity, can observe the within range outside the module on the gravity regulating plate, further impel joint strip to warp through increasing other heavy objects such as iron plate to make first detection chamber airtight. The center of the gravity adjusting plate is provided with a through hole for connecting the observation module.
The observation module is the cell body, form the second and detect the chamber, observation module opening one side and gravity regulating plate sealing connection, specifically can be for welding or bonding, the second detects the chamber and passes through the through-hole intercommunication with first detection chamber, the second detects the chamber and forms inclosed space, the bottom surface is for waiting the welding seam face of detecting, through detecting chamber evacuation to first detection chamber and second, and detect its atmospheric pressure change law, judge first detection chamber and second and detect the chamber and whether have the gas leakage condition, guarantee to the validity of welding seam testing process. In order to better and more visually weld the groove-shaped observation module consists of a surrounding side wall and observation glass matched with the side wall in shape, wherein the observation glass is arranged at the upper part of the side wall and is in sealing connection with the side wall, the inner side of the side wall is provided with a bracket protruding inwards, the bracket can be a continuous raised strip or a discontinuous point-shaped bulge, the observation glass is arranged above the bracket and can be kept to be arranged at the upper edge of the side wall, and the observation glass is bonded with the side wall through sealing glue to ensure the air tightness of the second detection cavity; in order to ensure the supporting function of the side wall and the bracket, the side wall can use a steel plate with the thickness of not less than 6mm, and the bracket is welded on the side wall with the width of not less than 3 mm; simultaneously, in order to avoid sheltering from the sight, the through-hole is the same with the shape that the lateral wall encloses, can be better observe the welding seam through observing glass, scribble foaming reagent before the detection on the welding seam, under the evacuation state, if the welding seam leaks gas, then can produce the bubble in relevant position, if do not produce the bubble, then prove that the welding seam is intact.
The air pressure detection module comprises a vacuumizing module and a metering module, the vacuumizing module comprises a vacuum air pump and a vacuumizing connector which are connected with each other, the vacuum air pump is connected with the vacuumizing connector through a hose, an air pumping air pressure regulating valve is connected between the vacuum air pump and the vacuumizing connector, and the vacuumizing duration and state are controlled through the air pressure regulating valve; the metering module comprises a vacuum meter and a detection connector which are connected with each other, the vacuum meter is connected with the detection connector through a vent pipe, a detection air pressure regulating valve is connected between the vacuum meter and the detection connector, and the vacuumizing connector and the detection connector both penetrate through the side wall of the observation module and are communicated with a second detection cavity; the vacuum meter can reflect the vacuum conditions in the first detection cavity and the second detection cavity; when the vacuum-pumping meter reaches a preset required value, the first detection cavity and the second detection cavity are determined to have good air tightness and accord with the detection requirements, and the welding seam detection result is reliable; then observing whether bubbles are generated at the welding seam, thereby judging whether the welding seam leaks air; during the detection, the effectiveness of the weld detection can be determined only by the air pressure value being greater than a preset value.
The method for detecting the quality of the welding seam by using the vacuum device for detecting the quality of the welding seam comprises the steps of covering one surface, provided with the sealing rubber strip, of the gravity adjusting plate on the welding seam to be detected, and observing whether bubbles gush out from the welding seam coated with the foaming reagent or not through observation glass under the condition that the air pressure detection module vacuumizes the first detection cavity and the second detection cavity.
The detection steps are as follows:
firstly, coating a foaming reagent on a welding line to be detected;
controlling the sealing base module to cover the welding line to be detected;
vacuumizing through an air pressure detection module, and detecting air pressure changes of the first detection cavity and the second detection cavity;
and observing whether bubbles emerge above the welding seam through the observation glass, thereby judging the quality of the welding seam to be detected. The method comprises the following specific steps:
s1: welding the spliced steel plates according to the design requirements, and carrying out air tightness detection conditions 24 hours after welding;
s2: coating a fertilizer foaming solution on a welding line to be detected, wherein the foaming solution can be soap solution or detergent solution, and then placing a vacuum device for detecting the quality of the welding line on the welding line to be detected so that the sealing base module covers the welding line to be detected;
s3: opening an air exhaust pressure regulating valve of the vacuum pumping module, and pumping out the gas in the first detection cavity and the second detection cavity through a vacuum air pump;
s4: opening the detection air pressure regulating valve, observing the pressure reading of a vacuum meter in the metering module, and when the pressure reading is stabilized at a preset value, proving that the device has good air tightness, is effective in detection and can start to observe;
s5: detecting the bubbling condition of bubbles above the welding line through observation glass by naked eyes;
s6: if no bubble gushes out, the air tightness of the welding seam is qualified, and if bubbles gush out, the quality of the welding seam is unqualified.
The invention is further illustrated by the following specific examples.
Example 1:
a vacuum device for detecting the quality of a welding seam comprises a sealing base module, an observation module and a gas pressure detection module.
The sealing base module comprises a rectangular gravity adjusting plate and a sealing rubber strip, the sealing rubber strip is fixed on the outer edge of the lower surface of the gravity adjusting plate and is enclosed end to end, the sealing rubber strip and the gravity adjusting plate form a first detection cavity, a rectangular strip-shaped through hole is formed in the center of the gravity adjusting plate, the thickness of the gravity adjusting plate is not less than 6mm, and the thickness of the elastic sealing rubber strip is not less than 5 cm;
the observation module is a rectangular groove body forming a second detection cavity, one side of an opening of the observation module is hermetically connected with the gravity adjusting plate, the edge of the side wall of the observation module is welded on the gravity adjusting plate, the through hole is in the range of the observation module, and the second detection cavity is communicated with the first detection cavity through the through hole; the observation module consists of a side wall and observation glass, the side wall is enclosed into a strip shape and matched with the shape of the through hole, the observation glass is also in the same shape, and the observation glass and the inner wall of the side wall of the enclosure side form the same strip rectangle; observe glass setting on lateral wall upper portion and in lateral wall sealing connection, the lateral wall inboard is equipped with the continuous bracket of inside salient, observes glass and places in the bracket top, and the edge is through sealed filling for the second detects the chamber airtight.
The air pressure detection module comprises a vacuumizing module and a metering module, the vacuumizing module comprises a vacuum air pump and a vacuumizing connector which are connected with each other, the vacuum air pump and the vacuumizing connector are connected through a hose, an air pressure adjusting valve is further connected between the vacuum air pump and the vacuumizing connector, the metering module comprises a vacuum meter and a detection connector which are connected with each other, the vacuum meter is connected with the detection connector through a vent pipe, a detection air pressure adjusting valve is further connected between the vacuum meter and the detection connector, and the vacuumizing connector and the detection connector all penetrate through a side wall of the observation module to communicate with the second detection cavity.
The method for detecting the quality of the welding seam by using the vacuum device for detecting the quality of the welding seam comprises the following specific steps:
s1: welding the spliced steel plates according to the design requirements, and carrying out air tightness detection conditions 24 hours after welding;
s2: smearing the soap liquid on the welding line to be detected, and then placing the device on the welding line to be detected, so that the sealing base module covers the welding line to be detected;
s3: opening an air exhaust pressure regulating valve of the vacuum pumping module, and pumping out the gas in the first detection cavity and the second detection cavity through a vacuum air pump;
s4: opening a detection air pressure regulating valve, observing the pressure reading of a vacuum meter in the metering module, and when the pressure reading is stabilized at a preset value, proving that the device has good air tightness and is effective in detection;
s5: observing the bubbling condition of bubbles above the welding line through observation glass by naked eyes;
s6: if no bubble gushes out, the air tightness of the welding seam is qualified, and if bubbles gush out, the quality of the welding seam is unqualified.
Example 2:
a vacuum device for detecting the quality of a welding seam comprises a sealing base module, an observation module and a gas pressure detection module.
The sealing base module comprises a circular gravity adjusting plate and a sealing rubber strip, the sealing rubber strip is fixed on the lower surface of the gravity adjusting plate and is in a circular shape in a head-to-tail enclosing mode, the sealing rubber strip and the gravity adjusting plate form a first detection cavity, a rectangular strip-shaped through hole is formed in the center of the gravity adjusting plate, the thickness of the gravity adjusting plate is not smaller than 6mm, and the thickness of the elastic sealing rubber strip is not smaller than 5 cm;
the observation module is a rectangular groove body forming a second detection cavity, one side of an opening of the observation module is hermetically connected with the gravity adjusting plate, the edge of the side wall of the observation module is welded on the gravity adjusting plate, the through hole is in the range of the observation module, and the second detection cavity is communicated with the first detection cavity through the through hole; the observation module consists of a side wall and observation glass, the side wall is enclosed into a strip shape which is larger than the shape of the through hole, the observation glass is also in the same shape, and the observation glass and the inner wall of the side wall of the enclosed side form the same strip rectangle; observe glass setting on lateral wall upper portion and in lateral wall sealing connection, the lateral wall inboard is equipped with the continuous bracket of inside salient, observes glass and places in the bracket top, and the edge is through sealed filling for the second detects the chamber airtight.
The air pressure detection module comprises a vacuumizing module and a metering module, the vacuumizing module comprises a vacuum air pump and a vacuumizing connector which are connected with each other, the vacuum air pump and the vacuumizing connector are connected through a hose, an air pressure adjusting valve is further connected between the vacuum air pump and the vacuumizing connector, the metering module comprises a vacuum meter and a detection connector which are connected with each other, the vacuum meter is connected with the detection connector through a vent pipe, a detection air pressure adjusting valve is further connected between the vacuum meter and the detection connector, and the vacuumizing connector and the detection connector all penetrate through a side wall of the observation module to communicate with the second detection cavity.
The method for detecting the quality of the welding seam by using the vacuum device for detecting the quality of the welding seam comprises the following specific steps:
s1: welding the spliced steel plates according to the design requirements, and carrying out air tightness detection conditions 24 hours after welding;
s2: coating a liquid detergent solution on the welding line to be detected, and then placing the device on the welding line to be detected, so that the sealing base module covers the welding line to be detected;
s3: opening an air exhaust pressure regulating valve of the vacuum pumping module, and pumping out the gas in the first detection cavity and the second detection cavity through a vacuum air pump;
s4: opening a detection air pressure regulating valve, observing the pressure reading of a vacuum meter in the metering system, and when the pressure reading is stabilized at a preset value, proving that the device has good air tightness and is effective in detection;
s5: observing the bubbling condition of bubbles above the welding line through observation glass by naked eyes;
s6: if no bubble gushes out, the air tightness of the welding seam is qualified, and if bubbles gush out, the quality of the welding seam is unqualified.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (10)
1. A vacuum device for detecting the quality of a welding seam is characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
the sealing base module comprises a gravity adjusting plate and a sealing rubber strip, the sealing rubber strip is fixed on the lower surface of the gravity adjusting plate and is enclosed end to end, the sealing rubber strip and the gravity adjusting plate form a first detection cavity, and a through hole is formed in the center of the gravity adjusting plate;
the observation module is a groove body forming a second detection cavity, observation glass is arranged on the observation module, one side of an opening of the observation module is hermetically connected with the gravity adjusting plate, and the second detection cavity is communicated with the first detection cavity through the through hole;
and the air pressure detection module is communicated with the second detection cavity, vacuumizes and detects the air pressure in the second detection cavity.
2. The vacuum apparatus for inspecting the quality of a weld according to claim 1, wherein: the observation module comprises a surrounding side wall and observation glass matched with the side wall in shape, and the observation glass is arranged on the upper part of the side wall and is connected with the side wall in a sealing manner;
preferably, the side wall is provided with an inwardly protruding bracket on an inner side thereof, and the observation glass is disposed above the bracket.
3. The vacuum apparatus for inspecting the quality of a weld according to claim 2, wherein: the through hole is matched with the shape enclosed by the side wall.
4. The vacuum apparatus for inspecting the quality of a weld according to claim 1, wherein: the atmospheric pressure detection module includes evacuation module and metering module, the evacuation module includes interconnect's vacuum aspiration pump and evacuation connector, metering module includes interconnect's vacuum table and detection connector, the evacuation connector with the detection connector all passes observation module lateral wall intercommunication the second detects the chamber.
5. The vacuum apparatus for inspecting the quality of a weld according to claim 4, wherein: the vacuum air pump with the evacuation connector passes through the hose connection, the vacuum air pump with still be connected with the atmospheric pressure governing valve of bleeding between the evacuation connector.
6. The vacuum apparatus for inspecting the quality of a weld according to claim 4, wherein: the vacuum meter with the detection connector passes through the breather pipe and connects, the vacuum meter with still be connected with the detection air pressure governing valve between the detection connector.
7. The vacuum apparatus for inspecting the quality of a weld according to any one of claims 1 to 6, wherein: the thickness of the gravity adjusting plate is not less than 6mm, and the thickness of the sealing rubber strip is not less than 5 cm.
8. The method for inspecting the quality of a weld using the vacuum apparatus for inspecting the quality of a weld according to any one of claims 1 to 7, wherein: and one side of the gravity adjusting plate, which is provided with the sealing rubber strip, covers the welding line to be detected, and the observation glass is used for observing whether bubbles flow out from the welding line coated with the foaming reagent or not under the condition that the air pressure detection module is used for vacuumizing the first detection cavity and the second detection cavity.
9. The method of detecting weld quality of claim 8, wherein: the detection steps are as follows:
firstly, coating a foaming reagent on a welding line to be detected;
controlling the sealing base module to cover the welding line to be detected;
vacuumizing through an air pressure detection module, and detecting air pressure changes of the first detection cavity and the second detection cavity;
and observing whether bubbles emerge above the welding seam through the observation glass, thereby judging the quality of the welding seam to be detected.
10. The method of detecting weld quality of claim 9, wherein: the foaming agent is soap solution or liquid detergent solution.
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| CN202010411886.4A CN111458080A (en) | 2020-05-15 | 2020-05-15 | Vacuum device and method for detecting quality of welding seam |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113390566A (en) * | 2021-06-21 | 2021-09-14 | 洛阳高华环保冷却科技有限公司 | Coil cooler gas tightness detection device |
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2020
- 2020-05-15 CN CN202010411886.4A patent/CN111458080A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113390566A (en) * | 2021-06-21 | 2021-09-14 | 洛阳高华环保冷却科技有限公司 | Coil cooler gas tightness detection device |
| CN113390566B (en) * | 2021-06-21 | 2024-05-17 | 洛阳高华环保冷却科技有限公司 | Air tightness detection device for coil cooler |
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