CN110159931B - Natural gas line leakage detection alarm device - Google Patents
Natural gas line leakage detection alarm device Download PDFInfo
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- CN110159931B CN110159931B CN201910403784.5A CN201910403784A CN110159931B CN 110159931 B CN110159931 B CN 110159931B CN 201910403784 A CN201910403784 A CN 201910403784A CN 110159931 B CN110159931 B CN 110159931B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
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Abstract
The invention discloses a natural gas pipeline leakage detection alarm device, which comprises a monitoring box, wherein a clamping box is arranged on the right side of the monitoring box, a cavity is arranged on the right side surface of the clamping box and the left side surface of the monitoring box, a pipeline is arranged in the cavity, when natural gas in the pipeline leaks slowly, the natural gas enters a storage cavity through a connecting cavity, after a period of time, a tympanic membrane is swollen, the natural gas leakage of the pipeline can be detected, through the matching of a sealing mechanism and the clamping mechanism, the leaked natural gas is prevented from flowing out of the device when the device detects the natural gas pipeline leakage, the personal health of a user in the leakage detection process is ensured, the detection accuracy of the device is also ensured, and when the pipeline leakage is very small, whether the natural gas pipeline leaks or not can be judged by observing whether the tympanic membrane in the detection mechanism swells or not, the condition that the leakage cannot be detected when the leakage of the natural gas pipeline is very small is avoided.
Description
Technical Field
The invention relates to the technical field of natural gas leakage detection, in particular to a natural gas pipeline leakage detection alarm device.
Background
The natural gas fuel is the first widely used one of various alternative fuels, but the natural gas can suffocate people after reaching a certain content in the air, and the natural gas can explode greatly when reaching a certain proportion, thereby affecting the personal safety.
After the natural gas line installation, need carry out natural gas leakage detection to the pipeline, general natural gas line leakage detection alarm device is when carrying out leakage detection to natural gas line, it is usually to detect the device around the pipe connection department round of turning, when meetting the pipeline leakage very little, because of the air influence, detection device probably can't detect out the leakage state, in addition, the user need take detection device for a long time when detecting and detect, can inhale too much natural gas, cause the influence to the health.
Disclosure of Invention
The invention aims to provide a natural gas pipeline leakage detection alarm device which is used for overcoming the defects in the prior art.
The natural gas pipeline leakage detection alarm device comprises a monitoring box, wherein a clamping box is arranged on the right side of the monitoring box, cavities are formed in the right side surface of the clamping box and the left side surface of the monitoring box, a pipeline is arranged in each cavity, a sealing mechanism capable of sealing the pipeline is further arranged in each cavity, the sealing mechanism ensures the accuracy of leakage detection of the device, a connecting cavity is communicated with the inner wall of the left side of the cavity on the left side of the cavity, a detection mechanism capable of detecting whether the pipeline leaks or not is arranged above the connecting cavity, the detection mechanism comprises a knocking disc fixedly arranged on the top surface of the monitoring box, and the knocking disc is knocked by the detection mechanism to generate sound so as to remind a user of the pipeline leakage;
the monitoring box is characterized in that clamping plates are fixedly and symmetrically arranged on the right side face of the monitoring box in an up-down mode, clamping cavities are symmetrically arranged on the left side face of the clamping box in an up-down mode, the clamping plates and the clamping cavities are installed in a sliding mode, and a clamping mechanism capable of clamping the clamping plates is arranged in the clamping box.
On the basis of the technical scheme, the sealing mechanism is composed of a flange, a sealing groove and a sealing block, the flange is fixedly installed on the pipeline, the sealing groove is communicated with the front and the back of the cavity, the sealing block is fixedly installed on the sealing groove and can be tightly attached to the pipeline, and the pipeline is prevented from flowing out of the sealing groove through the natural gas leaked from the flange.
On the basis of the technical scheme, the detection mechanism is further composed of a storage cavity and a tympanic membrane, the storage cavity is communicated with and arranged below the connecting cavity, and the tympanic membrane is fixedly arranged between the bottom wall of the storage cavity and the bottom surface of the monitoring box.
On the basis of the technical scheme, the eccentric wheel cavity is arranged above the connecting cavity, the eccentric wheel cavity is connected with the connecting cavity, the rotating rod is rotatably installed between the connecting cavity, and the rotating rod is located in the connecting cavity and fixedly installed with the two rotating disks.
On the basis of the technical scheme, the right side of the eccentric wheel cavity is communicated with a moving cavity, a moving block is slidably mounted in the moving cavity, a spring is fixedly mounted between the right side face of the moving block and the inner wall of the right side of the moving cavity, the eccentric wheel is fixedly mounted on the top surface of the rotating rod, a rack cavity is communicated with the upper portion of the moving cavity, a rack is slidably mounted in the rack cavity, the rack is fixedly connected with the moving block, an auxiliary cavity is communicated with the left side of the rack cavity, the rack extends leftwards to penetrate through the inner wall of the right side of the auxiliary cavity, an auxiliary block is fixedly mounted on the left side face of the rack, a button is fixedly mounted on the inner wall of the right.
On the basis of the technical scheme, a power cavity is communicated and arranged above the rack cavity, a transmission cavity is arranged on the rear side of the power cavity, the power rod is rotatably arranged between the transmission cavity, a first gear is fixedly arranged on the front side of the power rod, the first gear is meshed with the rack, a second gear is fixedly arranged on the rear side of the power rod, an articulated cavity is arranged on the right side of the power cavity, the connecting rod is rotatably arranged between the articulated cavity and the transmission cavity, a third gear is fixedly arranged on the rear side of the connecting rod, a chain is arranged between the third gear and the second gear in a transmission mode, a fixed wheel is fixedly arranged on the front side of the connecting rod, an articulated rod is hinged and arranged on the front side of the fixed wheel, a moving rod penetrates through the top wall of the articulated cavity and is slidably arranged, and the moving rod is hinged and arranged on the moving rod.
On the basis of the technical scheme, the top surface of the moving rod is fixedly provided with a knocking ball, the moving rod moves up and down to drive the knocking ball to move up and down, and the knocking ball knocks the knocking disc to make a sound to remind a user.
On the basis of the technical scheme, the clamping mechanism consists of a meshing cavity, a knob rod, a knob, a first bevel gear, a thread cavity, a thread block, a thread hole, a thread rod, a second bevel gear and a rubber block, wherein the meshing cavity is arranged in the clamping box, the knob rod penetrating through the right side surface of the clamping box is rotatably arranged on the inner wall of the right side of the meshing cavity, the knob rod is fixedly arranged on the right side surface of the knob rod, the first bevel gear is fixedly arranged on the left side surface of the knob rod, the thread cavities are symmetrically arranged on the upper and lower sides of the meshing cavity, the thread block is slidably arranged in the thread cavity, the thread hole is arranged in the thread block, the thread rod is rotatably arranged between the thread cavity and the meshing cavity, the thread rod is in thread arrangement with the thread hole, and the second bevel gear is fixedly arranged in the meshing cavity on, the second bevel gear is meshed with the knob rod, and the rubber block is fixedly installed on the thread block.
The invention has the beneficial effects that: according to the invention, through the matching of the sealing mechanism and the clamping mechanism, when the device is used for detecting the leakage of the natural gas pipeline, the leaked natural gas is prevented from flowing out of the device, the personal health of a user in the process of detecting the leakage is ensured, the detection accuracy of the device is also ensured, and when the leakage of the pipeline is very small, whether the leakage of the natural gas pipeline exists can be judged by observing whether the tympanic membrane in the detection mechanism is swollen, so that the situation that the leakage cannot be detected when the leakage of the natural gas pipeline is very small is avoided, and the device is worthy of popularization.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic sectional view taken along line A-A in FIG. 1;
FIG. 3 is a schematic cross-sectional view taken along line B-B of FIG. 1;
FIG. 4 is an enlarged schematic view at C of FIG. 1;
fig. 5 is an enlarged schematic view at D in fig. 1.
Detailed Description
The invention will now be described in detail with reference to fig. 1-5, for convenience of description, the following orientations will now be defined: the up, down, left, right, and front-back directions described below correspond to the up, down, left, right, and front-back directions in the projection relationship of fig. 1 itself.
Referring to fig. 1 to 5, the natural gas pipeline leakage detection alarm device according to the embodiment of the present invention includes a monitoring box 11, a clamping box 35 is disposed on the right side of the monitoring box 11, a cavity 23 is disposed on the right side of the clamping box 35 and the left side of the monitoring box 11, a pipeline 21 is disposed in the cavity 23, a sealing mechanism 101 capable of sealing the pipeline 21 is further disposed in the cavity 23, the sealing mechanism 101 ensures the accuracy of the device leakage detection, a connecting cavity 18 is disposed on the left inner wall of the cavity 23 on the left side in a communicating manner, a detection mechanism 102 capable of detecting whether the pipeline 21 leaks is disposed above the connecting cavity 18, the detection mechanism 102 includes a knocking disk 38 fixedly mounted on the top surface of the monitoring box 11, the knocking disk 38 is knocked by the detection mechanism 102 to generate a sound for reminding a user of the leakage of the pipeline 21, the monitoring box 11 is characterized in that clamping plates 34 are symmetrically and fixedly mounted on the right side surface of the monitoring box 11 in an up-down mode, clamping cavities 32 are symmetrically and vertically arranged on the left side surface of the clamping box 35, the clamping plates 34 and the clamping cavities 32 are mounted in a sliding mode, and clamping mechanisms 103 capable of clamping the clamping plates 34 are arranged in the clamping box 35.
In addition, in an embodiment, the sealing mechanism 101 includes a flange 22 fixedly mounted on the pipeline 21, the cavity 23 is provided with a sealing groove 57 in front and rear communication, a sealing block 52 is fixedly mounted on the sealing groove 57, and the sealing block 52 can be tightly attached to the pipeline 21 to prevent the natural gas leaked from the pipeline 21 through the flange 22 from flowing out of the sealing groove 57.
In addition, in an embodiment, the detecting mechanism 102 further includes a storage cavity 19 disposed below the connection cavity 18 in a communicating manner, and a drum 20 is fixedly mounted between a bottom wall of the storage cavity 19 and a bottom surface of the monitoring box 11, so that when the natural gas in the pipeline 21 leaks slowly, the natural gas enters the storage cavity 19 through the connection cavity 18, and after a period of time, the drum 20 is swollen, and the natural gas leakage in the pipeline 21 can be detected.
In addition, in an embodiment, connect the chamber 18 top and establish the eccentric wheel chamber 15, the eccentric wheel chamber 15 with connect and rotate installation dwang 16 between the chamber 18, lie in on the dwang 16 connect two rolling disks 17 of 18 internal fixation installations to when the natural gas leakage volume in the pipeline 21 is slightly big, the natural gas flow can drive the rolling disk 17 and rotate, and the rolling disk 17 rotates and can drive the dwang 16 and rotate, makes the dwang 16 do detection mechanism 102 provides power.
In addition, in one embodiment, a moving cavity 58 is communicated with the right side of the eccentric wheel cavity 15, a moving block 13 is slidably mounted in the moving cavity 58, a spring 40 is fixedly mounted between the right side surface of the moving block 13 and the right inner wall of the moving cavity 58, an eccentric wheel 14 is fixedly mounted on the top surface of the rotating rod 16, a rack cavity 39 is communicated with the upper side of the moving cavity 58, a rack 56 is slidably mounted in the rack cavity 39, the rack 56 is fixedly connected with the moving block 13, an auxiliary cavity 53 is communicated with the left side of the rack cavity 39, the rack 56 extends leftwards to penetrate through the right inner wall of the auxiliary cavity 53, an auxiliary block 54 is fixedly mounted on the left side surface of the rack 56, a button 55 is fixedly mounted on the right inner wall of the auxiliary cavity 53, a flashing lamp 12 is fixedly mounted on the left side surface of the monitoring box 11, so that when the, the eccentric wheel 14 and the spring 40 are matched to enable the moving block 13 to move left and right, the moving block 13 moves left and right to drive the rack 56 to move left and right, the auxiliary block 54 continuously presses the button 55, and the button 55 controls the on and off of the flashing light 12 to remind a user of natural gas leakage in the pipeline 21.
In addition, in one embodiment, a power cavity 42 is communicated above the rack cavity 39, a transmission cavity 51 is arranged at the rear side of the power cavity 42, a power rod 41 is rotatably installed between the transmission cavity 51 and the power cavity 42, a first gear 43 is fixedly installed on the front side surface of the power rod 41, the first gear 43 is engaged with the rack 56, a second gear 50 is fixedly installed on the rear side surface of the power rod 41, a hinge cavity 45 is arranged at the right side of the power cavity 42, a connecting rod 47 is rotatably installed between the hinge cavity 45 and the transmission cavity 51, a third gear 48 is fixedly installed on the rear side surface of the connecting rod 47, a chain 49 is rotatably installed between the third gear 48 and the second gear 50, a fixed wheel 46 is fixedly installed on the front side surface of the connecting rod 47, a hinge rod 44 is hinged on the front side surface of the fixed wheel 46, a moving rod 36 penetrating through the top surface of the monitoring box 11 is slidably installed in the top wall 45 of the hinge, the moving rod 36 is hinged to the hinge rod 44, so that when the rack 56 moves left and right, the rack 56 drives the power rod 41 and the second gear 50 to rotate through the first gear 43, the second gear 50 drives the third gear 48 and the connecting rod 47 to rotate through the chain 49, and the connecting rod 47 drives the fixed wheel 46 to rotate to provide power for moving the moving rod 36.
In addition, in one embodiment, a knocking ball 37 is fixedly mounted on the top surface of the moving rod 36, the moving rod 36 moves up and down to drive the knocking ball 37 to move up and down, and the knocking ball 37 strikes a knocking disc 38 to make a sound to remind a user.
In addition, in one embodiment, the clamping mechanism 103 includes an engaging cavity 59 disposed in the clamping box 35, a knob rod 25 rotatably mounted through the right side of the clamping box 35 is rotatably mounted on the inner wall of the right side of the engaging cavity 59, a knob 26 is fixedly mounted on the right side of the knob rod 25, a first bevel gear 24 is fixedly mounted on the left side of the knob rod 25, a threaded cavity 28 is symmetrically disposed on the upper and lower sides of the engaging cavity 59, a threaded block 31 is slidably mounted in the threaded cavity 28, a threaded hole 30 is disposed in the threaded block 31, a threaded rod 29 is rotatably mounted between the threaded cavity 28 and the engaging cavity 59, the threaded rod 29 is threadedly mounted with the threaded hole 30, a second bevel gear 27 is fixedly mounted on the threaded rod 29 in the engaging cavity 59, the second bevel gear 27 is engaged with the knob rod 25, a rubber block 33 is fixedly mounted on the threaded block 31, so that after the clamping plate 34 enters the clamping cavity 32, the knob rod 25 is driven to rotate by rotating the knob 26, the first bevel gear 24 is driven to rotate by rotating the knob rod 25, the threaded rod 29 is driven to rotate by the first bevel gear 24 through the second bevel gear 27, the threaded rod 29 rotates to enable the threaded block 31 to move, and friction force is increased through the rubber block 33 to limit the movement of the clamping plate 34.
When the natural gas leakage detection device is used, the sealing mechanism 101 prevents the natural gas leaked from the pipeline 21 through the flange 22 from flowing out of the sealing groove 57, when the natural gas in the pipeline 21 leaks slowly, the natural gas enters the storage cavity 19 through the connecting cavity 18, after a period of time, the eardrum 20 can be bulged, the natural gas leakage of the pipeline 21 can be detected, when the natural gas leakage amount in the pipeline 21 is slightly large, the natural gas flows to drive the rotating disc 17 to rotate, the rotating disc 17 rotates to drive the rotating rod 16 to rotate, the rotating rod 16 drives the eccentric wheel 14 to rotate, the eccentric wheel 14 is matched with the spring 40 to drive the moving block 13 to move left and right, the moving block 13 moves left and right to drive the rack 56 to move left and right, so that the auxiliary block 54 continuously presses the button 55, the button 55 controls the on and off of the flashing lamp 12 to remind a user of the natural gas leakage in the pipeline 21, and, the second gear 50 drives the third gear 48 and the connecting rod 47 to rotate through the chain 49, the connecting rod 47 rotates to drive the fixed wheel 46 to rotate, the fixed wheel 46 drives the knocking ball 37 to move up and down through the hinge rod 44, so that the knocking ball 37 knocks the knocking disk 38 to make a sound to remind a user, after the clamping plate 34 enters the clamping cavity 32, the knob rod 25 is driven to rotate through the rotating knob 26, the knob rod 25 rotates to drive the first bevel gear 24 to rotate, the first bevel gear 24 drives the threaded rod 29 to rotate through the second bevel gear 27, the threaded rod 29 rotates to enable the threaded block 31 to move, friction is increased through the rubber block 33, and movement of the clamping plate 34 is limited.
The invention has the beneficial effects that: according to the invention, through the matching of the sealing mechanism and the clamping mechanism, when the device is used for detecting the leakage of the natural gas pipeline, the leaked natural gas is prevented from flowing out of the device, the personal health of a user in the process of detecting the leakage is ensured, the detection accuracy of the device is also ensured, and when the leakage of the pipeline is very small, whether the leakage of the natural gas pipeline exists can be judged by observing whether the tympanic membrane in the detection mechanism is swollen, so that the situation that the leakage cannot be detected when the leakage of the natural gas pipeline is very small is avoided, and the device is worthy of popularization.
It will be apparent to those skilled in the art that various modifications may be made to the above embodiments without departing from the general spirit and concept of the invention. All falling within the scope of protection of the present invention. The protection scheme of the invention is subject to the appended claims.
Claims (1)
1. The utility model provides a natural gas line leak testing alarm device, includes monitoring box, its characterized in that: the device comprises a monitoring box, a pipeline, a sealing mechanism and a detection mechanism, wherein the monitoring box is arranged on the right side of the monitoring box, the clamping box is arranged on the right side of the monitoring box, cavities are formed in the right side surface of the clamping box and the left side surface of the monitoring box, the pipeline is arranged in the cavities, the sealing mechanism capable of sealing the pipeline is also arranged in the cavities, the sealing mechanism ensures the accuracy of leakage detection of the device, the inner wall of the left side of the cavity on the left side is communicated with a connecting cavity, the detection mechanism capable of detecting whether the pipeline leaks or not is arranged above the connecting cavity, the detection mechanism comprises a knocking disc fixedly arranged on the top surface of the monitoring box, and;
a clamping plate is vertically and symmetrically fixedly installed on the right side face of the monitoring box, clamping cavities are vertically and symmetrically arranged on the left side face of the clamping box, the clamping plate and the clamping cavities are installed in a sliding mode, and a clamping mechanism capable of clamping the clamping plate is arranged in the clamping box;
the sealing mechanism consists of a flange, a sealing groove and a sealing block;
the flange is fixedly arranged on the pipeline, the sealing groove is formed in the cavity in a front-back communication mode, the sealing block is fixedly arranged on the sealing groove and can be tightly attached to the pipeline, and natural gas leaked by the pipeline through the flange is prevented from flowing out of the sealing groove;
the detection mechanism is also composed of a storage cavity and a tympanic membrane;
the storage cavity is communicated and arranged below the connecting cavity, and the tympanic membrane is fixedly arranged between the bottom wall of the storage cavity and the bottom surface of the monitoring box;
an eccentric wheel cavity is arranged above the connecting cavity, a rotating rod is rotatably arranged between the eccentric wheel cavity and the connecting cavity, and two rotating discs are fixedly arranged on the rotating rod in the connecting cavity;
a moving cavity is communicated with the right side of the eccentric wheel cavity, a moving block is slidably mounted in the moving cavity, a spring is fixedly mounted between the right side surface of the moving block and the right side inner wall of the moving cavity, an eccentric wheel is fixedly mounted on the top surface of the rotating rod, a rack cavity is communicated with the upper part of the moving cavity, a rack is slidably mounted in the rack cavity, the rack is fixedly connected with the moving block, an auxiliary cavity is communicated with the left side of the rack cavity, the rack extends leftwards to penetrate through the right side inner wall of the auxiliary cavity, an auxiliary block is fixedly mounted on the left side surface of the rack, a button is fixedly mounted on the right side inner wall of the auxiliary cavity, and;
a power cavity is communicated with the upper side of the rack cavity, a transmission cavity is arranged on the rear side of the power cavity, a power rod is rotatably arranged between the transmission cavity and the power cavity, a first gear is fixedly arranged on the front side surface of the power rod, the first gear is meshed with the rack, a second gear is fixedly arranged on the rear side surface of the power rod, a hinged cavity is arranged on the right side of the power cavity, a connecting rod is rotatably arranged between the hinged cavity and the transmission cavity, a third gear is fixedly arranged on the rear side surface of the connecting rod, a chain is arranged between the third gear and the second gear in a transmission manner, a fixed wheel is fixedly arranged on the front side surface of the connecting rod, a hinged rod is hinged on the front side surface of the fixed wheel, a moving rod penetrating through the top surface of the monitoring box is slidably arranged on the top wall of the hinged cavity, and;
the top surface of the moving rod is fixedly provided with a knocking ball, the moving rod moves up and down to drive the knocking ball to move up and down, and the knocking ball knocks the knocking disc to make a sound to remind a user;
the clamping mechanism consists of an engagement cavity, a knob rod, a knob, a first bevel gear, a threaded cavity, a threaded block, a threaded hole, a threaded rod, a second bevel gear and a rubber block;
the engagement cavity is arranged in the clamping box, the right inner wall of the right side of the engagement cavity is rotatably installed and penetrates through the knob rod on the right side of the clamping box, the right side of the knob rod is fixedly installed on the knob, the left side of the knob rod is fixedly installed on the first bevel gear, the engagement cavity is vertically and symmetrically arranged on the screw thread cavity, the screw thread cavity is slidably installed in the screw thread block, the screw thread hole is formed in the screw thread block, the screw thread cavity is rotatably installed between the engagement cavity and the screw thread rod, the screw thread rod is installed with the screw thread hole in a threaded mode, the screw thread rod is located on the engagement cavity and fixedly installed on the second bevel gear, the second bevel gear is engaged with the knob rod, and the rubber block is fixedly installed on the screw thread block.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910403784.5A CN110159931B (en) | 2019-05-15 | 2019-05-15 | Natural gas line leakage detection alarm device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910403784.5A CN110159931B (en) | 2019-05-15 | 2019-05-15 | Natural gas line leakage detection alarm device |
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| CN110159931A CN110159931A (en) | 2019-08-23 |
| CN110159931B true CN110159931B (en) | 2020-12-22 |
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| CN201910403784.5A Active CN110159931B (en) | 2019-05-15 | 2019-05-15 | Natural gas line leakage detection alarm device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110657353B (en) * | 2019-10-09 | 2021-03-30 | 重庆花想容信息科技有限公司 | Emergency device for accidents in hydration workshop of thermal power plant |
| CN113532765B (en) * | 2020-04-10 | 2024-02-13 | 浙江省海洋水产研究所 | Chromatograph gas circuit air leakage detection structure and method |
| CN112253773A (en) * | 2020-09-23 | 2021-01-22 | 江苏理工学院 | Gate valve with automatic detection function |
| CN113280270A (en) * | 2021-05-18 | 2021-08-20 | 永高股份有限公司 | Pipeline leakage monitoring equipment based on Beidou satellite |
| CN113719762A (en) * | 2021-08-23 | 2021-11-30 | 刘淑琴 | Natural gas line leakage detection device |
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| US20040140666A1 (en) * | 2003-01-17 | 2004-07-22 | Lin Yen Tang | Hose coupler having detecting device |
| CN104595726A (en) * | 2015-01-19 | 2015-05-06 | 傅永财 | Natural gas pipeline system having leakage warming function |
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| CB03 | Change of inventor or designer information | ||
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Inventor after: Yu Fanyi Inventor after: Shuai Xiangyi Inventor before: Shuai Xiangyi |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20201201 Address after: 266600 No.1 East Beijing Road, Laixi City, Qingdao City, Shandong Province Applicant after: QINGDAO IWEI GAS Co.,Ltd. Address before: 321000 Qiantang Village 231, Zuocun Town, Dongyang City, Jinhua City, Zhejiang Province Applicant before: Dongyang Berg Environmental Protection Technology Co.,Ltd. |
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