CN107929970B - Starting device of chemical oxygen self-rescuer - Google Patents
Starting device of chemical oxygen self-rescuer Download PDFInfo
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- CN107929970B CN107929970B CN201711174446.6A CN201711174446A CN107929970B CN 107929970 B CN107929970 B CN 107929970B CN 201711174446 A CN201711174446 A CN 201711174446A CN 107929970 B CN107929970 B CN 107929970B
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
- A62B21/00—Devices for producing oxygen from chemical substances for respiratory apparatus
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Abstract
The invention discloses a starting device of a chemical oxygen self-rescuer, which adopts the following technical scheme that the starting device comprises a protective cover and an oxygen releasing agent storage chamber which are arranged up and down, wherein an isolating membrane is fixed between the protective cover and the oxygen releasing agent storage chamber, a starting component is hinged above the protective cover through a hinged shaft, an elastic starting bag is fixedly arranged in the protective cover and the isolating membrane, and a pricking pin is fixed at one end, far away from the isolating membrane, in the elastic starting bag; the starting assembly comprises a driving section and an action section, the distance from the end part of the action section to the hinge shaft of the starting assembly is greater than the distance between the pricking pin and the isolating membrane, the elastic starting bag comprises a deformation chamber fixed on the isolating membrane, a fixed connection block is fixed at one end of the deformation chamber far away from the isolating membrane, the pricking pin extending towards the isolating membrane is fixed on the fixed connection block, and the pricking pin is in an inverted cone shape; the reduction of revealing of starting liquid has been reached, guarantees the normal use of self-rescuer, reduces the limitation of starting liquid and oxygen evolving agent reaction, improves the effect of the reaction degree of starting liquid and oxygen evolving agent.
Description
Technical Field
The invention relates to the field of coal mine lifesaving equipment, in particular to a starting device of a chemical oxygen self-rescuer.
Background
The self-rescuer is a portable breathing protection device for preventing harmful gas poisoning or oxygen deficiency asphyxiation when a person entering a well has fire, gas, coal dust explosion and coal and gas outburst in the well.
The chemical oxygen self-rescuer utilizes chemical substances (such as potassium superoxide) to generate oxygen, and the potassium superoxide reacts with water or carbon dioxide as follows: 4KO2+2H2O＝4KOH+3O2,4KO2+2CO2＝2K2CO3+3O2(ii) a I.e., when the potassium superoxide comes into contact with water or carbon dioxide, oxygen is generated which supports the wearer from escaping the hazard zone. Therefore, the chemical oxygen self-rescuer is usually internally provided with a potassium superoxide block, the potassium superoxide block is sealed by soft materials such as polytetrafluoroethylene, and a starting device is arranged at a position close to the potassium superoxide block. When the device is used, the starting device is pulled to puncture the soft material wrapped outside the potassium superoxide medicine block, so that the potassium superoxide medicine block is contacted with carbon dioxide and water vapor exhaled by a human body to generate oxygen for the human body to breathe.
A conventional potassium superoxide start-up device is shown in chinese patent No. CN 85201624U. The starting principle of the starting device is shown in figure 1, and the starting device comprises a protective cover 1, wherein the lower end part of the protective cover 1 is connected with an oxygen releasing agent storage chamber 2, and the protective cover 1 and the oxygen releasing agent storage chamber 2 are separated by a separation film 3. The starting bag is fixed in the protective cover 1 and is made of rubber and has certain elasticity. The start-up capsules are filled with water or acid for reaction with potassium superoxide. The top of the starting capsule is fixedly connected with a starting component 6 with a puncture needle 43, and the upper end part of the starting component 6 extends to the outer side of the protective cover 1. The starting assembly 6 is located the periphery cover of the inside portion of the protection cover 1 and establishes compression spring, and the caulking groove is seted up to the part circumference that starting assembly 6 stretches out protection cover 1 to place the lock pearl in the caulking groove, the part outside that starting assembly 6 stretches out protection cover 1 connects the lock pearl gland.
When the lock bead pressing cover is used, the lock bead pressing cover is pulled outwards, and the lock bead falls out of the caulking groove. The compression spring returns to its original shape and drives the spike 43 of the actuating assembly 6 close to the isolation diaphragm 3 and pierces the isolation diaphragm 3. The water or acid in the starting capsule then passes through the barrier membrane 3 to contact the potassium superoxide powder, producing oxygen. When the lock ball gland is pulled outwards, the required axial force is too large, and the starting assembly 6 is inconvenient to open.
Disclosure of Invention
The invention aims to provide a starting device of a chemical oxygen self-rescuer, which changes a starting mode that a starting component is pulled apart along an axial direction into a rotating and pressing mode, and is convenient to open the starting component.
The technical purpose of the invention is realized by the following technical scheme: a starting device of a chemical oxygen self-rescuer comprises a protective cover and an oxygen releasing agent storage chamber which are arranged up and down, wherein an isolating membrane is fixed between the protective cover and the oxygen releasing agent storage chamber, a starting component is hinged above the protective cover through a hinged shaft, an elastic starting bag is fixedly arranged in the protective cover and the isolating membrane, and a puncture needle is fixed at one end, far away from the isolating membrane, in the elastic starting bag; the starting assembly comprises a driving section and an action section, the distance between the end part of the action section and the hinge shaft of the starting assembly is greater than the distance between the pricking pin and the isolating membrane, the elastic starting bag comprises a deformation chamber fixed on the isolating membrane, the deformation chamber is far away from one end of the isolating membrane and is fixedly connected with a fixing block, the pricking pin extending towards the isolating membrane is fixed on the fixing block, and the pricking pin is in an inverted cone shape.
By adopting the technical scheme, the potassium superoxide block is placed in the oxygen generating agent storage chamber to serve as an oxygen generating agent. The elastic starting bag is filled with water as starting liquid. The driving section of the starting assembly is applied with force, the hinge shaft of the starting assembly rotates, the action section is driven to press the elastic starting bag, and then the pricking pin is enabled to be close to the isolating membrane. When the end of the action section is abutted against the elastic starting bag, the pricking pin pierces the isolation membrane, and the starting liquid in the elastic starting bag is contacted and reacted with the potassium superoxide block in the oxygen releasing agent storage chamber to generate oxygen for a wearer to use; the fixing block is arranged in the deformation chamber, the contact area of the installation site of the puncture needle is increased, and the puncture needle is arranged in an inverted cone shape, so that when the starting assembly presses the buffer block and the puncture needle punctures the isolation membrane, the installation part of the puncture needle reversely punctures the deformation chamber.
Furthermore, the direction perpendicular to the connecting line of the driving section, the hinge shaft and the action section in the starting assembly is respectively provided with an abutting section and a locking section, and the distance from the locking section to the hinge shaft is greater than the distance from the abutting section to the hinge shaft.
Technical scheme more than adopting, under the normal condition, butt section and elasticity start bag butt, and relative movement does not take place for the two. When the actuating assembly rotates 90 degrees around the hinge shaft, the pricker pricks the isolating membrane. When the starting assembly rotates 180 degrees around the hinged shaft, the locking section is abutted to the elastic starting bag. And because the distance of the locking section from the hinge shaft is greater than that of the abutting section from the hinge shaft, the locking section still presses the elastic starting capsule, and the pricking pin is in a state of pricking the isolating membrane, so that the starting liquid is continuously contacted with the potassium superoxide block.
Furthermore, a buffer block is arranged between the elastic starting bag and the starting component, two end parts of the buffer block are fixed with guide parts which are in sliding connection with the protective cover, and the guide parts are consistent with the movement direction of the puncture needles along the sliding direction of the protective cover.
Technical scheme more than adopting, because elasticity starts the bag and has certain elasticity, for the area of contact that increases start-up subassembly and elasticity start-up bag, set up the buffer block between the two, when start-up subassembly rotates, promote the buffer block and slide for the safety cover, the buffer block and then promote elasticity start-up bag and drive the felting needle and move towards the barrier film.
Furthermore, the buffer block is far away from the end face of the elastic starting bag to fix the positioning part; the locking section is correspondingly provided with an embedded groove matched with the positioning part.
Technical scheme more than adopting, the buffer block upper end sets up location portion, and when the starting assembly rotated to locking section and buffer block butt, the caulking groove mateed with location portion joint for the starting assembly can keep this state of pressing the felting needle.
In addition, when the caulking groove is clamped with the positioning part, the elastic starting capsule has a certain deformation recovery amount, at the moment, the puncture needle can correspondingly leave the isolating membrane along with the deformation recovery of the elastic starting capsule, so that the gap between the puncture needle and the hole punctured by the isolating membrane is increased, and the starting liquid in the elastic starting capsule is fully contacted with the potassium superoxide block.
Preferably, the abutting section is connected with the action section through a cambered surface.
By adopting the technical scheme, when the starting assembly rotates to work, the abutting section and the action section on the starting assembly are abutted with the upper end face of the buffer block according to the sequence. The junction with butt section and action section sets to the cambered surface, conveniently rotates the start assembly to the operator opens the start assembly fast in emergency.
Further, the oxygen releasing agent storage chamber comprises a temporary storage chamber for placing the oxygen releasing agent blocks, the upper end of the temporary storage chamber is bolted with the upper cover, the middle of the upper cover is provided with an opening, and the upper end of the upper cover is fixed with the isolating membrane.
Technical scheme more than adopting, the oxygen-evolving agent piece is placed in the chamber of keeping in, and the chamber lateral wall trompil of keeping in. When the starting liquid in the deformation chamber is contacted with the oxygen-releasing agent block, the generated oxygen escapes outwards through the holes of the temporary storage chamber. The upper cover is bolted with the temporary storage cavity, so that the oxygen releasing agent block placed in the temporary storage cavity can be replaced conveniently.
Furthermore, a convex block is connected between the locking section and the driving section, a positioning block matched with the convex block is correspondingly arranged on the protective cover, and when the starting assembly rotates to the stroke tail end, the convex block is in clamping matching with the positioning block.
By adopting the technical scheme, the lug is arranged between the locking section and the driving section, and after the starting assembly rotates 180 degrees, the lug is clamped with the positioning block on the protective cover to further position the starting assembly. When an emergency occurs, the starting assembly can be positioned after being rotated and opened, and the starting assembly is prevented from shaking under the condition of confusion.
In conclusion, the invention has the following beneficial effects:
1. the starting assembly is opened in a rotating mode, and an operator holds the driving section to rotate by utilizing the lever principle, so that the action section is abutted against the elastic starting bag, and the pricking pin is correspondingly pushed to pierce the isolating membrane, thereby being more convenient and labor-saving;
2. in the opening process of the starting assembly, the action section and the locking section on the starting assembly are sequentially contacted with the elastic starting bag, and the locking section is provided with an embedded groove. After the starting assembly is completely opened, the puncture needle penetrates the isolating membrane and then leaves the isolating membrane, the gap between the puncture needle and the opening of the isolating membrane is increased, and the starting liquid in the elastic starting bag is more fully contacted with the potassium superoxide block in the oxygen releasing agent storage chamber.
Drawings
FIG. 1 is a schematic view of a starting device of a chemical oxygen self-rescuer in the background art;
FIG. 2 is a sectional view of an activating device of the chemical oxygen self-rescuer according to the first embodiment;
FIG. 3 is an exploded view of the starting device of the chemical oxygen self-rescuer of the first embodiment, showing the screw-fit relationship between the temporary storage chamber and the upper cover;
FIG. 4 is a view showing a state where the starting member of the starting apparatus of the chemical oxygen self-rescuer of the first embodiment is rotated 90 degrees;
FIG. 5 is a view showing a state in which an actuating unit of the chemical oxygen self-rescuer is rotated 180 degrees in the actuating device according to the first embodiment;
FIG. 6 is a schematic view showing the construction of a starting device of the chemical oxygen self-rescuer in the second embodiment;
in the figure, 1, a protective cover; 11. a fixed end; 12. starting the connecting end; 13. a guide groove; 14. positioning blocks;
2. an oxygen-releasing agent storage chamber; 21. a temporary storage chamber; 22. an upper cover;
3. an isolation film;
4. an elastic starting capsule; 41. a deformation chamber; 42. a fixing and connecting block; 43. a needle;
5. a buffer block; 51. a guide portion; 52. a positioning part;
6. starting the component; 61. hinging a shaft; 62. a drive section; 63. an action section; 64. an abutment section; 65. a locking section; 651. caulking grooves; 652. a locking surface; 66. a bump;
7. an oxygen releasing agent block.
Detailed Description
The present invention will be described in further detail with reference to examples.
The first embodiment is as follows: a starting device of a chemical oxygen self-rescuer is disclosed, which is combined with a figure 2, and comprises a protective cover 1, wherein the lower end of the protective cover 1 is connected with an oxygen releasing agent storage chamber 2, and a separation film 3 is fixed between the protective cover 1 and the oxygen releasing agent storage chamber 2. An elastic starting capsule 4 is fixed on the upper end face of the isolation membrane 3 in the protective cover 1, and a puncture needle 43 is fixed in the elastic starting capsule 4. The upper end of the protective cover 1 is hinged with a starting assembly 6, and the starting assembly 6 is abutted with the elastic starting bag 4. The starting assembly 6 is rotated, the starting assembly 6 pushes the elastic starting bag 4 to drive the puncture needle 43 to puncture the diaphragm, and the starting of the chemical oxygen self-rescuer is realized.
The oxygen releasing agent storage chamber 2 comprises a temporary storage chamber 21 made of a steel wire mesh, the upper end part of the temporary storage chamber 21 is bolted with a fixed upper cover 22, and the middle of the upper cover 22 is opened. The temporary storage chamber 21 is separated from the upper cover 22, so that the oxygen agent block 7 (such as a potassium superoxide block) can be placed in the temporary storage chamber 21, and the oxygen agent block 7 is convenient to replace.
With reference to fig. 2 and fig. 3, the protection cover 1 is fixed to the upper end surface of the upper cover 22 in a bonding manner, the protection cover 1 includes a fixed end 11 fixed to the upper cover 22, an opening on one side of the protection cover 1 away from the fixed end 11 forms a starting connection end 12, and the starting connection end 12 is provided with guide grooves 13 symmetrically arranged along the height direction of the protection cover 1.
The isolation film 3 is made of polytetrafluoroethylene film so as to facilitate penetration of the pricker 43, and large shrinkage is not generated, and the polytetrafluoroethylene film has good acid resistance and alkali resistance.
The elastic starting bag 4 is fixedly bonded above the isolating membrane 3 and comprises a deformation chamber 41 fixedly bonded with the isolating membrane 3, and the deformation chamber 41 is made of a rubber material, so that the deformation chamber 41 can be elastically deformed to be pressed down or rebounded. One end of the elastic deformation chamber 41 far away from the isolating membrane 3 is bonded with a fixed fixing block 42, a puncture needle 43 is bonded and fixed on the fixed fixing block 42, the puncture needle 43 is in an inverted cone shape, and the puncture needle part faces the isolating membrane 3, so that the connection stability of the puncture needle 43 is improved.
In order to increase the contact area between the actuating unit 6 and the elastic actuating bladder 4, the upper end of the elastic actuating bladder 4 abuts against the buffer block 5, and the buffer block 5 is slidably connected with the guide groove 13 of the protection cover 1. The buffer block 5 includes a guide portion 51 slidably coupled with the guide groove 13 such that the buffer block 5 slides in the height direction of the protection cover 1. The upper end of the buffer block 5 fixes the positioning part 52 to facilitate the clamping and fixing with the starting assembly 6.
The actuating assembly 6 is hinged to the upper end of the protective cover 1 by means of a hinge shaft 61, the hinge shaft 61 being arranged perpendicular to the direction of the line connecting the two guide grooves 13. Actuating assembly 6 comprises a drive section 62 and an actuating section 63, which are positioned in the same line, the end of drive section 62 being spaced from hinge 61 by a greater distance than the end of actuating section 63 being spaced from hinge 61 to facilitate the rotation of actuating assembly 6 by the operator. And the distance between the end of the actuating section 63 and the hinge shaft 61 is greater than the distance between the lancet needles 43 and the barrier film 3 in order to facilitate puncturing of the barrier film 3. An abutting section 64 is arranged between the driving section 62 and the action section 63 and close to the buffer block 5, and a locking section 65 is arranged between the driving section and the action section and far away from the buffer block 5.
In the normal state, as shown in fig. 2, the flat surface of the abutment section 64 abuts against the positioning portion 52 of the cushion block 5. Actuating assembly 6 is rotated 90 degrees about hinge 61 as shown in FIG. 4, with the end of actuating section 63 abutting bumper 5 and spike 43 piercing barrier 3.
The starting assembly 6 is further rotated, in order to lock the starting assembly 6 conveniently, the locking section 65 is provided with a caulking groove 651, and a plane parallel to the abutting section 64 extends from the bottom surface of the caulking groove 651 on the locking section 65, and the plane is a locking surface 652. As shown in fig. 5, when the actuating assembly 6 is rotated 180 degrees, the locking surface 652 abuts against the buffer block 5, and the positioning portion 52 is engaged with the caulking groove 651, thereby positioning the actuating assembly 6.
After the puncture needle 43 punctures the isolation film 3, when the starting assembly 6 rotates until the caulking groove 651 is clamped with the positioning part 52, the elastic starting bag 4 correspondingly restores deformation, so that the puncture needle 43 rises for a certain distance, a certain gap is left between the puncture needle 43 and the punctured opening on the isolation film 3, and the liquid in the elastic starting bag 4 more conveniently flows into the oxygen releasing agent storage chamber 2.
In order to rotate the starting assembly 6 conveniently, the abutting section 64 is connected with the action section 63 through an arc surface, and the starting assembly 6 rotates more flexibly.
When the device is used, the temporary storage chamber 21 is opened by rotating, a potassium superoxide block with the diameter of 44mm and the height of 20mm is placed in the temporary storage chamber 21, 0.8m L of water is injected into the deformation chamber 41 before sealing, and the abutting section 64 of the starting assembly 6 is abutted against the buffer block 5 under normal conditions.
In case of emergency, the actuating assembly 6 rotates around the hinge shaft 61, the actuating section 63 abuts against the upper end surface of the buffer block 5 and presses the buffer block 5 downward, and the pricking pin 43 pierces the isolation diaphragm 3 when the end of the actuating section 63 abuts against the upper end of the buffer block 5. The liquid in the deformation chamber 41 flows along the gap between the puncture needle 43 and the puncture opening in the isolation diaphragm 3 to the temporary storage chamber 21, and the potassium superoxide reacts with water to generate oxygen which escapes from the opening of the side wall of the temporary storage chamber 21. When the caulking groove 651 is clamped with the positioning part 52, the deformation chamber 41 is partially deformed, the puncture needle 43 is partially extended, the gap between the puncture needle 43 and the puncture opening on the isolating membrane 3 is increased, the liquid in the temporary storage chamber 21 flows more conveniently, and the potassium superoxide continuously reacts with water.
Example two: an actuating device of a chemical oxygen self-rescuer, which is combined with fig. 6, the difference between the embodiment and the first embodiment is that: a bump 66 is fixed between the locking section 65 and the driving section 62 on the starting assembly 6, a positioning block 14 is fixed at a position on the protective cover 1 corresponding to the bump 66, and the joint of the positioning block 14 and the protective cover 1 has certain elasticity, so that the bump 66 can be conveniently embedded into a groove formed between the positioning block 14 and the protective cover 1.
After the starting assembly 6 rotates 180 degrees around the hinge shaft 61, the caulking groove 651 is clamped with the positioning part 52, and meanwhile, the bump 66 is clamped and fixed with the positioning block 14, so that the locking of the starting assembly 6 is further strengthened.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (7)
1. The utility model provides a starting drive of chemical oxygen self-rescuer, includes safety cover (1) and the oxygen-releasing agent apotheca (2) of arranging from top to bottom, fixes barrier film (3) between safety cover (1) and the oxygen-releasing agent apotheca (2), its characterized in that: the starting component (6) is hinged above the protective cover (1) through a hinge shaft (61), an elastic starting bag (4) is fixedly arranged in the protective cover (1) and the isolating membrane (3), and a puncture needle (43) is fixed at one end, far away from the isolating membrane (3), in the elastic starting bag (4); the starting assembly (6) comprises a driving section (62) and an action section (63), the distance between the end part of the action section (63) and the hinge shaft (61) of the starting assembly (6) is greater than the distance between the puncture needle (43) and the isolating membrane (3), the elastic starting bag (4) comprises a deformation chamber (41) fixed on the isolating membrane (3), one end of the deformation chamber (41) far away from the isolating membrane (3) is fixedly connected with a fixing block (42), the puncture needle (43) extending towards the isolating membrane (3) is fixed on the fixing block (42), and the puncture needle (43) is in an inverted cone shape.
2. The starting device of the chemical oxygen self-rescuer of claim 1, wherein: an abutting section (64) and a locking section (65) are respectively arranged in the direction perpendicular to the connecting lines of the driving section (62), the hinge shaft (61) and the action section (63) in the starting assembly (6), and the distance from the locking section (65) to the hinge shaft (61) is greater than the distance from the abutting section (64) to the hinge shaft (61).
3. The starting device of the chemical oxygen self-rescuer of claim 2, wherein: a buffer block (5) is arranged between the elastic starting bag (4) and the starting component (6), two end parts of the buffer block (5) are fixed with guide parts (51) which are in sliding connection with the protective cover (1), and the guide parts (51) are consistent with the movement direction of the puncture needle (43) along the sliding direction of the protective cover (1).
4. The starting device of the chemical oxygen self-rescuer of claim 3, wherein: the buffer block (5) is far away from the end face fixing and positioning part (52) of the elastic starting bag (4); the locking section (65) is correspondingly provided with a caulking groove (651) matched with the positioning part (52).
5. The starting device of the chemical oxygen self-rescuer of claim 2, wherein: the abutting section (64) is connected with the action section (63) by adopting an arc surface.
6. The starting device of the chemical oxygen self-rescuer of claim 1, wherein: the oxygen releasing agent storage chamber (2) comprises a temporary storage chamber (21) for placing an oxygen releasing agent block (7), the upper end part of the temporary storage chamber (21) is bolted with an upper cover (22), the middle of the upper cover (22) is opened, and the upper end part of the upper cover (22) is fixed with the isolating membrane (3).
7. The starting device of the chemical oxygen self-rescuer of claim 2, wherein: a convex block (66) is connected between the locking section (65) and the driving section (62), a positioning block (14) matched with the convex block (66) is correspondingly arranged on the protective cover (1), and when the starting assembly (6) rotates to the tail end of the stroke, the convex block (66) is in clamping matching with the positioning block (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711174446.6A CN107929970B (en) | 2017-11-22 | 2017-11-22 | Starting device of chemical oxygen self-rescuer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711174446.6A CN107929970B (en) | 2017-11-22 | 2017-11-22 | Starting device of chemical oxygen self-rescuer |
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| Publication Number | Publication Date |
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| CN107929970A CN107929970A (en) | 2018-04-20 |
| CN107929970B true CN107929970B (en) | 2020-07-17 |
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| CN201711174446.6A Active CN107929970B (en) | 2017-11-22 | 2017-11-22 | Starting device of chemical oxygen self-rescuer |
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| CN108939334A (en) * | 2018-05-24 | 2018-12-07 | 任冲 | A kind of saving oneself respirator |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3861880A (en) * | 1973-03-06 | 1975-01-21 | Dow Chemical Co | Oxygen generator cell |
| CN2154080Y (en) * | 1993-02-16 | 1994-01-26 | 陈震 | Portable quick oxygen producer |
| CN2161334Y (en) * | 1993-09-02 | 1994-04-13 | 北京百龙同兴绿色科技研究中心 | Device for producing oxygen |
| US20090188681A1 (en) * | 2008-01-30 | 2009-07-30 | Ming Tung Chang | Powder agitating device for fire extinguisher |
| CN103920269B (en) * | 2014-03-12 | 2016-06-01 | 浙江金盾消防器材有限公司 | A kind of gas fire-extinguishing plant with signal feedback and emergent manual operation |
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Effective date of registration: 20230410 Address after: 261300 Changyi Binhai (Xiaying) Economic Development Zone, Weifang City, Shandong Province Patentee after: Changyi Rongxin Chemical Co.,Ltd. Address before: 102400 magezhuang village, Fangshan street, Fangshan District, Beijing Patentee before: BEIJING HENGXIN CHEMICAL Co.,Ltd. |
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