CN1766385A - Complete gas explosion preventing device - Google Patents
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- CN1766385A CN1766385A CN 200410087879 CN200410087879A CN1766385A CN 1766385 A CN1766385 A CN 1766385A CN 200410087879 CN200410087879 CN 200410087879 CN 200410087879 A CN200410087879 A CN 200410087879A CN 1766385 A CN1766385 A CN 1766385A
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Abstract
The invention discloses a kit of gas explosion-proof device, which consists of high pressure pipe gas explosion-proof valve and timing pressure-regulating explosion-proof valve based on the present pressure-regulating valve, which comprises the following -arts: case, inlet channel in connection with the case, outlet channel in connection with the pressure chamber; the valve seat is set on two sid es of inlet channel and outlet channel in connection with the spool separately; the piston or rubber film is set in the pressure chamber to mate pressure spring, push-pull bar and lever; the lever is set on the lever fulcrum with one end connecting spool crown bar to mate spool and the other end plugging in the push-pull bar, which accomplishes the goal of automatic two-way gas closure due to leakage and explosion; the kit of gas explosion-proof device mates a double-insurance safe switch explosion-proof valve to improve safety.
Description
The present invention relates to a kind of gas explosion preventing device, particularly a kind of have stop gas leakage, complete gas explosion preventing device that the explosive accident that prevents to catch fire takes place.
At present, employed explosion-proof valve in China's high pressure pipe line combustion gas, major part is the automatically controlled explosion-proof valve of import, it is manufacture cost height (each more than 10 ten thousand yuan) not only, be unfavorable for intensive the installation, difficulty is guaranteed the safety in long-distance high pressure gas pipeline road, other is the employed pressure regulation explosion-proof valves of present people, could automatic self-closing gas when it can only reach the aging explosion of pipeline or pipeline and comes off the gas leakage of big flow, and it is relevant with gaseous-pressure in the gas cylinder to close effect, when it will close malfunctioning during hypotony in the gas cylinder, particularly it can not close coal gas when gas cylinder angle valve switch little gas leakage tightly do not occur when people close, can cause the long little gas leakage of combustion gas in night to cause the generation of being poisoned to death or catching fire the explosive accident disaster, the gas cylinder switch valve and the pipeline gas switch valve that also have people using now, it does not just have explosion-proof performance at all, when people the transportation gas cylinder unexpectedly in collision make the switch angle valve loosening or store the medium and small child that is in and play when opening the gas cylinder switch, will cause gas leakage, catch fire, the generation of explosive accident endangers not shallow.
In order to address the above problem, complete gas explosion preventing device of the present invention, it is low cost of manufacture not only, easily push away universal, and stable work in work, never malfunctioning, in the high pressure pipe line combustion gas, use, can intensive install, can avert a war, earthquake or terrorist's destruction, can reduce to bottom line to the accident casualty loss; In gas cylinder, use, can guarantee transportation safety, the storage safe and safe in utilization of gas cylinder, in indoor low pressure pipeline combustion gas, use, can stop long little gas leakage in night and take place, can ensure to greatest extent that people use the safety of combustion gas with the various gas leakage accidents that in use occurred.
According to above-mentioned purpose, complete gas explosion preventing device of the present invention, it is by a high pressure pipe line anti-explosion fuel gas valve, a timing pressure regulation explosion-proof valve, a dual fail-safe safety switch explosion-proof valve constitutes, described high pressure pipe line anti-explosion fuel gas valve, and it is to improve to form on the basis of existing gas pressure regulating valve, it comprises housing, and housing has air inlet pathway, the pressure chamber that is interconnected, the pathway of giving vent to anger; Respectively installing a valve seat in the air inlet pathway and the pathway both sides of giving vent to anger matches with spool; Installing piston in appropriate position also is equiped with the anti-gas-leak O-ring seal in the piston in pressure chamber, installs pressure spring between piston upper end and the pressure chamber's cover cap, and piston lower end installing lever is taken off the wooden fork pull bar and matched with lever; Lever is installed on the balance pivot, the one end spool push rod of ining succession matches with spool, the other end inserts lever and takes off in the wooden fork pull bar, make piston, lever take off the work that matches of wooden fork pull bar, lever, spool push rod, spool by combustion gas self pressure, reach the purpose of gas leakage, the two-way automatic self-closing gas of blast, also be equiped with a use start button device in appropriate position, air inlet pathway upper end and match, to reach the closed condition of removing this valve with spool.Described timing pressure regulation explosion-proof valve, it also is to improve to form on the basis of existing pressure regulator valve, and it comprises housing, and housing has air inlet pathway, high pressure admission mouth, pressure chamber, the pathway of giving vent to anger that is interconnected; One of installing is forward closed combustion gas valve seat, spool, spool push rod automatically and is matched with the pressure little spring between air inlet pathway and high pressure admission mouth, and wherein pressure chamber is divided into upper shell and lower shell body; Installing pressure regulation rubber film between upper shell and lower shell body, pressure regulation rubber film lower end installing pressure spring, upper end installing pressure regulation is taken off the wooden fork pull bar and is matched with pressure regulation lever, spool push rod, spool; Lever is installed on the balance pivot in the pressure chamber, one end is installed little plug and is headed on the spool push rod and matches with spool, the other end inserts pressure regulation and takes off in the wooden fork pull bar, make pressure regulation rubber film, pressure spring, pressure regulation take off the work that matches of wooden fork pull bar, pressure regulation lever, the little plug of pressure regulation, high pressure admission mouth, spool push rod, spool, valve seat by combustion gas self pressure, reach the purpose of pressure regulation, voltage stabilizing and gas leakage, blast automatic self-closing gas; Also being equiped with a use start button device in appropriate position, gas leakage automatic self-closing gas spool upper end matches, to reach the closed condition of removing this valve, the appropriate position is also installed a wind-up timer device and is matched in described pressure regulation explosion-proof valve, drive the work that matches with valve seat of valve rod, pressure little spring, spool by the raised points on the convex-concave wheel control valve rod in the timer arrangement main rotating shaft, reach timing automatic close combustion gas convenient use and avoid people to forget closing combustion gas and cause burning foods or catch fire, the generation of explosive accident.
Described dual fail-safe safety switch valve is explosion-proof, and it comprises a housing, and housing has the air inlet pathway that is interconnected, the pathway of giving vent to anger; Respectively be equiped with a valve seat matches with pressure spring with automatic self-closing gas spool forward in the air inlet pathway and the conducting both sides of giving vent to anger; Offer the valve rod via at the air inlet pathway with the place, pathway neutral position of giving vent to anger, valve rod is inserted in the valve rod via and prevents that by the O-ring seal sealing combustion gas is toward external leakage, match and control the purpose of opening burnt gas switch and closing burnt gas switch to reach in appropriate position, valve rod lower end installing convex-concave point and right side forward automatic self-closing gas spool, the valve rod upper end also is equiped with the convenient use of switch knob, this dual fail-safe safety switch explosion-proof valve also matches with the special-purpose connecting head of a flexible rubber hose, can reach the purpose of normal use.
The invention has the beneficial effects as follows: can stop or reduce gas leakage, guarantee that people use the Security of combustion gas, are beneficial to environmental protection.
Below in conjunction with drawings and Examples to further instruction of the present invention.
Structural representation when Fig. 1 is a high pressure pipe line anti-explosion fuel gas valve proper functioning of the present invention.
Fig. 2 is the structural representation of high pressure pipe line anti-explosion fuel gas valve of the present invention when closing automatically.
Fig. 3 is a timing pressure regulation explosion-proof valve structural representation of the present invention.
Fig. 4 is a dual fail-safe safety switch explosion-proof valve structural representation of the present invention.
Fig. 5 is a common pressure regulation explosion-proof valve structural representation of the present invention.
Fig. 6 is a dual fail-safe gas cylinder switch explosion-proof valve structural representation.
Among Fig. 1,1. housing; 2. air inlet pathway; 3. pressure chamber; 4. the pathway of giving vent to anger; 5. valve seat; 6. spool; 7. piston; 8. O-ring seal; 9. pressure chamber's cover cap; 10. pressure spring; 11. lever is taken off the wooden fork pull bar; 12. lever; 13. balance pivot; 14. spool push rod; 15. gaseous-pressure; 16. start button device.
Among Fig. 3,1. housing; 2. air inlet pathway; 3. high pressure admission mouth; 4. pressure chamber; 5. the pathway of giving vent to anger; 6. valve seat; 7. spool; 8. pressure little spring; 9. upper shell; 10. lower shell body; 11. pressure regulation rubber film; 12. pressure spring; 13. the wooden fork pull bar is taken off in pressure regulation; 14. pressure regulation lever; 15. spool push rod; 16. balance pivot; 17 little plugs; 18. gaseous-pressure; 19. timer arrangement; 20. the timer arrangement master is revolved axle; 21. convex-concave wheel; 22. valve rod; 23. valve rod raised points; 24. regularly close the coal gas spool; 25. timer knob; 26. use start button; 27. timing automatic is closed the combustion gas valve seat; 28. pressure little spring.
Among Fig. 4,1. housing; 2. air inlet pathway; 3. the conducting of giving vent to anger; 4. valve seat; 5. spool; 6. pressure spring; 7. valve rod via; 8. valve rod; 9. O-ring seal; 10. convex-concave point; 11. switch knob; 12. flexible rubber hose connecting head.
For convenience of description, the component of identical function are all marked same numeral among the figure.
Fig. 1 shows high pressure pipe line anti-explosion fuel gas valve embodiment of the present invention, and it comprises housing (1), and housing (1) has air inlet pathway (2), pressure chamber (3), the pathway of giving vent to anger (4) that is interconnected; Respectively being equiped with a valve seat (5) in air inlet pathway (2) and the pathway of giving vent to anger (4) both sides matches with spool (6); Appropriate position installing piston (7) in pressure chamber (3), also be equiped with anti-gas-leak O-ring seal (8) in the piston (7) and prevent that combustion gas is toward external leakage, install pressure spring (10) between piston (7) upper end and the pressure chamber's cover cap (9), piston lower end installing lever is taken off wooden fork pull bar (11) and is matched with lever (12), lever (12) is installed on the balance pivot (13), the one end spool (6) of ining succession, the other end inserts lever and takes off in the wooden fork pull bar (11), make piston (7) by combustion gas self pressure (15), lever is taken off wooden fork pull bar (11), lever (12), spool push rod (14), spool (6) work that matches, reach gas leakage, the explode purpose of two-way automatic self-closing gas, also be equiped with a use start button device (16) in appropriate position, air inlet pathway (2) upper end and match, to reach the closed condition of removing this valve with spool (6).Described spool (6) can be the ball spool, also can be the spool of butterfly valve core or other patterns.
Fig. 3 shows the embodiment of timing pressure regulation explosion-proof valve of the present invention, and it comprises housing (1), and housing (1) has air inlet pathway (2), high pressure admission mouth (3), pressure chamber (4), the pathway of giving vent to anger (5) that is interconnected; Combustion gas valve seat (6), spool (7) are forward closed in one of installing automatically between air inlet pathway (2) and high pressure admission mouth (3), spool push rod (15) matches with pressure little spring (8), wherein pressure chamber (4) is divided into upper shell (9) and upper shell (10), installing pressure regulation rubber film (11) between upper shell (9) and lower shell body (10), pressure regulation rubber film (11) lower end installing pressure spring (12), upper end are debug to press and are taken off wooden fork pull bar (13) and match with pressure regulation lever (14), little plug (17), spool push rod (15), spool (7); Lever (14) is installed on the balance pivot (16), one end is installed little plug (17) and is headed on spool push rod (15) and matches with spool (7), the other end inserts pressure regulation and takes off in the wooden fork pull bar (13), make pressure regulation rubber film (11) by combustion gas self pressure, pressure spring (12), wooden fork pull bar (13) is taken off in pressure regulation, pressure regulation lever (14), little plug (17), high pressure admission mouth (3), spool push rod (15), spool (7), valve seat (6), pressure little spring (8) work that matches, reach pressure regulation, voltage stabilizing and gas leakage, the purpose of blast automatic self-closing gas, an installing anti-use start button (26) in appropriate position matches in gas leakage automatic self-closing gas spool (7) upper end, to reach the closed condition of removing this valve; The appropriate position is also installed a wind-up timer device (19) and is matched in described pressure regulation explosion-proof valve, drive the work that matches with valve seat (27) of valve rod (22), pressure little spring (28), spool (24) by the raised points (23) on the convex-concave in the timer arrangement main rotating shaft (20) wheel (21) the control valve rods (22), reach timing automatic and close combustion gas, convenient use cause burning foods with avoiding people to forget closing combustion gas or catch fire, the generation of explosive accident.
Fig. 4 shows the embodiment of dual fail-safe safety switch explosion-proof valve of the present invention, and it comprises that a housing (1), housing (1) have the air inlet pathway (2) that is interconnected, the pathway of giving vent to anger (3); Respectively be equiped with a valve seat (4) matches with pressure spring (6) with automatic self-closing gas spool (5) forward in air inlet pathway (2) and the pathway of giving vent to anger (3) both sides; Offer valve rod via (7) in air inlet pathway (2) and the middle appropriate position of the pathway (3) of giving vent to anger, valve rod (8) is inserted in the valve rod via (7) and prevents the past external leakage of combustion gas by O-ring seal (9) sealing, match to reach the purpose that control is opened combustion gas and closed burnt gas switch in valve rod (8) appropriate position, lower end installing convex-concave point (10) and right side forward automatic self-closing gas spool (5), valve rod (8) upper end also is equiped with the convenient use of switch knob (11), this dual fail-safe safety switch explosion-proof valve also is furnished with the special-purpose connecting head of a flexible rubber hose (12) and matches, and can reach the purpose of normal use.
Described timing pressure regulation explosion-proof valve can manufacture two kinds of products, i.e. regularly pressure regulation explosion-proof valve (as shown in Figure 3) and common pressure regulation explosion-proof valve (as shown in Figure 5), common pressure regulation explosion-proof valve are to use the start button device to be installed in this common pressure regulation explosion-proof valve housing lower end with the difference of pressure regulation explosion-proof valve regularly to adapt to position (as shown in Figure 5).Described dual fail-safe safety switch explosion-proof valve will change its structure (as shown in Figure 6) as using in gas cylinder, this paper does not elaborate, and is appreciated that.
Note: described two-way automatic self-closing gas is meant: can close this high pressure pipe line anti-explosion fuel gas valve leading portion fuel gas source place's following current combustion gas, also can close the combustion gas of this high pressure pipe line anti-explosion fuel gas valve rear end adverse current.
Described combustion gas is meant liquefied petroleum gas (LPG), rock gas and all kinds of inflammable gas.
Described high pressure pipe line anti-explosion fuel gas valve and dual fail-safe safety switch explosion-proof valve also can use in petroleum delivery pipeline or other fluid pipelines, are universal products.
The method of work of described high pressure pipe line anti-explosion fuel gas valve is: this valve is connected in the high-pressure gas gas pipeline, (about 1 kilometer-10 kilometers of each distance) can intensively be installed; When bringing into use, can open the fuel gas source main switch earlier, be linked in sequence then and press start button device (16) and remove the automatic closed condition of this valve combustion gas is entered in the pipeline, when the inner combustion gas of pipeline reaches constant pressure substantially, this valve can enter normal working (as shown in Figure 1), when the somewhere pipeline was blasted, front end spool (6) will be at combustion gas automatic self-closing gas under the effect of flowing pressure (15) and pressure spring (10) power forward; Rear end spool (6) will be under the effect of reverse fuel gas flow pressure (15) and pressure spring (10) power automatic self-closing gas (as shown in Figure 2), reach two-way automatic self-closing gas; Described start button device (16) can utilize manually presses the automatic closed condition of removing this valve in order, also can utilize pneumatic, surge, the omnidistance control of other power such as electronic opens the automatic closed condition (this paper does not have diagram and set forth in detail, is appreciated that) of removing this valve simultaneously.
The use advantage of this high pressure pipe line anti-explosion fuel gas valve is: simple in structure, low cost of manufacture can realize intensive the installation, and stable work in work is embedded in and need safeguard underground decades, can reduce to bottom line to the gas accidents disaster, easily popularizes.
The using method of described timing pressure regulation explosion-proof valve is: open the fuel gas source switch when needs use earlier, press start button device (22) then and remove the automatic closed condition of this valve, combustion gas can enter in the pressure chamber (4), the pressure regulation rubber film promptly can expand outward to drive and take off wooden fork pull bar (13) under the effect of gaseous-pressure (18), make the work that matches of pressure regulation lever (14), little plug (17), spool push rod (15), spool (7), this valve can enter normal working (diagram is not arranged).When leaking air accident, the interior end pressure of pressure chamber (4) reduces, and under the effect of pressure spring (12) and pressure little spring (8), this valve promptly enters automatic self-closing gas state (as shown in Figure 3).When needs set time cooking food, can regulate knob (25) to needed time place clockwise and get final product, when not needing to regulate the time during cooking food, can regulate knob (25) to place, normally open position counterclockwise and get final product (diagram is not arranged).
The use advantage of this timing pressure regulation explosion-proof valve be simple in structure, cost of production is low, the convenient use, save combustion gas, be beneficial to environmental protection, can stop the little leakage of long-time combustion gas in night, also can avoid people to forget simultaneously closing combustion gas and cause burning foods or the generation of the major accident of catching fire, guarantee the safety that combustion gas is used.
The using method of described dual fail-safe safety switch explosion-proof valve is: but the rotary switc handle makes raised points (10) back down spool (as shown in Figure 4) when needs use, this valve gets final product normal ventilation, but the rotary switc handle makes the recessed spool that gets out of the way when stopping using, and this valve can cut out automatically.
The use advantage of this dual fail-safe safety switch explosion-proof valve is: use in gas cylinder and can guarantee transportation safety and deposit safe, safe in utilization; In pipeline gas, use and to avoid switch to close with wearing and tearing for a long time, sternly do not make long-time little gas leakage in night constitute harm, pipeline gas company can install the combustion gas house lead in advance, before the user does not open an account the special-purpose gas-fired equipment use of cooperation gas company, this valve is taken at self-locking state, the accident that will not leak air can guarantee that combustion gas installs the Security of house lead in advance.
This complete gas explosion preventing device can supportingly use, and also can separate independent use.
Claims (2)
1, a kind of complete gas explosion preventing device, it is characterized in that: it is by a high pressure pipe line anti-explosion fuel gas valve, a timing pressure regulation explosion-proof valve, a dual fail-safe safety switch explosion-proof valve constitutes, described high pressure pipe line anti-explosion fuel gas valve, it is to improve to form on the basis of existing gas pressure regulating valve, and it comprises housing (1), and housing has air inlet pathway (2), pressure chamber (3), the pathway of giving vent to anger (4) that is interconnected; Respectively installing a valve seat (5) in air inlet pathway (2) and the pathway of giving vent to anger (4) both sides matches with spool (6); Appropriate position installing piston (7) in pressure chamber (3), installing anti-gas-leak O-ring seal (8) in the piston (7), install pressure spring (10) between piston (7) upper end and the pressure chamber's cover cap (9), piston lower end installing lever is taken off wooden fork pull bar (11) and is matched with lever; Lever is installed on the balance pivot (13), the one end spool push rod (14) of ining succession matches with spool (6), the other end inserts and takes off in the wooden fork pull bar (11), by combustion gas (15) self pressure make piston (7), take off wooden fork pull bar (11), lever (13), spool push rod (14), spool (6) match work, reach the purpose of gas leakage, the two-way automatic self-closing gas of blast; Also be equiped with one at air inlet pathway upper end appropriate location and use start button device (16) to match, to reach the closed condition of removing this valve with spool (6); Described timing pressure regulation explosion-proof valve, it also is to improve to form on the basis of existing pressure regulator valve, and it comprises housing (1), and housing (1) has air inlet pathway (2), high pressure admission mouth, pressure chamber (4), the pathway of giving vent to anger (5) that is interconnected; One of installing is forward closed combustion gas valve seat (5), spool (6), spool push rod (7) automatically and is matched with pressure little spring (8) between air inlet pathway (2) and high pressure admission mouth (3), wherein pressure chamber (4) is divided into upper shell (9) and lower shell body (10), installing pressure regulation rubber film (11) between upper shell (9) and lower shell body (10), pressure regulation rubber film upper end installing pressure spring (12), lower end installing pressure regulation is taken off wooden fork pull bar (13) and is matched with pressure regulation bar (14), spool push rod (15), spool (7); Lever (14) is installed on the balance pivot (16) in the pressure chamber, and install little plug (17), one end heads on spool push rod (15) and matches with spool (7), the other end inserts pressure regulation and takes off in the wooden fork pull bar (13), make pressure regulation rubber film (11), pressure spring (12), pressure regulation take off the work that matches of wooden fork pull bar (13), pressure regulation lever (14), the little plug of pressure regulation (17), high pressure admission mouth, spool push rod (15), spool (7), valve seat (6) by combustion gas self pressure (18), reach the purpose of voltage-regulation voltage-stabilization and gas leakage, blast automatic self-closing gas; Also be equiped with a start button device (26) in leak gas automatic self-closing gas spool (7) upper end or this appropriate position, valve chest lower end and match, to reach the releasing closed condition of this valve; Described dual fail-safe safety switch explosion-proof valve, it comprises a housing (1), housing (1) has the air inlet pathway (2) that is interconnected, the pathway of giving vent to anger (3), respectively is equiped with a valve seat (4) in air inlet pathway (2) and the pathway of giving vent to anger (3) both sides and matches with pressure spring (6) with automatic self-closing gas spool (5) forward; Offer valve rod via (7) in air inlet pathway (2) and the middle appropriate position of the pathway (3) of giving vent to anger, valve rod (8) is inserted in the valve rod via (7) and prevents the past external leakage of combustion gas by O-ring seal (9) sealing, match to reach the purpose that control is opened combustion gas and closed combustion gas in valve rod (8) appropriate position, lower end installing convex-concave point (10) and right side forward automatic self-closing gas spool (5), valve rod (8) upper end also is equiped with the convenient use of switch knob (11), this dual fail-safe safety switch explosion-proof valve also is furnished with one and uses the special-purpose connecting head of flexible rubber hose, can reach the purpose of normal use.
2, complete gas explosion-proof valve according to claim 1, it is characterized in that: an appropriate location wind-up timer device of installing (19) matches in described pressure regulation explosion-proof valve, upward raised points (23) drive valve rod (22), pressure little spring (28), spool (24) match with valve seat (27) by convex-concave wheel (21) control valve rod (22) in the timer arrangement running shaft (20), reach timing automatic and close combustion gas, avoid people to forget closing combustion gas and cause burning foods or catch fire, purpose that explosive accident takes place.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410087879 CN1766385A (en) | 2004-10-26 | 2004-10-26 | Complete gas explosion preventing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410087879 CN1766385A (en) | 2004-10-26 | 2004-10-26 | Complete gas explosion preventing device |
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| Publication Number | Publication Date |
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| CN1766385A true CN1766385A (en) | 2006-05-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410087879 Pending CN1766385A (en) | 2004-10-26 | 2004-10-26 | Complete gas explosion preventing device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102777768A (en) * | 2011-05-11 | 2012-11-14 | 大丰市丰泰机电有限公司 | Gas explosion protection top device |
| CN108413433A (en) * | 2018-05-15 | 2018-08-17 | 无锡锡州机械有限公司 | A kind of combustion gas gatherer |
| CN112212041A (en) * | 2020-09-14 | 2021-01-12 | 廖代云 | Domestic gas self-closing valve with small force loss |
| CN112254880A (en) * | 2020-09-27 | 2021-01-22 | 深圳市盐田港建筑工程检测有限公司 | Building waterproof detection device |
-
2004
- 2004-10-26 CN CN 200410087879 patent/CN1766385A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102777768A (en) * | 2011-05-11 | 2012-11-14 | 大丰市丰泰机电有限公司 | Gas explosion protection top device |
| CN108413433A (en) * | 2018-05-15 | 2018-08-17 | 无锡锡州机械有限公司 | A kind of combustion gas gatherer |
| CN112212041A (en) * | 2020-09-14 | 2021-01-12 | 廖代云 | Domestic gas self-closing valve with small force loss |
| CN112254880A (en) * | 2020-09-27 | 2021-01-22 | 深圳市盐田港建筑工程检测有限公司 | Building waterproof detection device |
| CN112254880B (en) * | 2020-09-27 | 2021-10-29 | 深圳市盐田港建筑工程检测有限公司 | Building waterproof detection device |
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