CN213022160U - Air tightness inspection machine for steel pipes - Google Patents
Air tightness inspection machine for steel pipes Download PDFInfo
- Publication number
- CN213022160U CN213022160U CN202021856286.0U CN202021856286U CN213022160U CN 213022160 U CN213022160 U CN 213022160U CN 202021856286 U CN202021856286 U CN 202021856286U CN 213022160 U CN213022160 U CN 213022160U
- Authority
- CN
- China
- Prior art keywords
- steel pipe
- wall
- box
- compression spring
- box body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model discloses an air tightness inspection machine of steel pipe, the power distribution box comprises a box body, the inside top of box is equipped with the steel pipe, the equal rigid coupling in lower surface four corners of box has the support, the lower surface rigid coupling of box has the valve, the outside of steel pipe is equipped with detection mechanism. This machine is examined to gas tightness of steel pipe, through the box, the steel pipe, and a support, the cooperation between valve and the detection mechanism, first compression spring can kick-back and make two toper stoppers and the both sides of steel pipe offset tightly, then start the air feeder in the hose outside, pressurize the operation to inside the steel pipe through violently managing and tubule, then sneak into the inside clear water of box with the steel pipe downstream, whether the steel pipe outside is examined to the gas tightness that whether gassing can treat the detection steel pipe during, difficult unqualified steel pipe of gas tightness appears is put into production and is used, can guarantee follow-up product shaping quality, do benefit to high-efficient production and processing and required.
Description
Technical Field
The utility model relates to a welding accessory production and processing technology field specifically is an air tightness inspection machine of steel pipe.
Background
The principle of the air tightness test is that the device and an additional liquid (generally water) form a closed whole, the temperature of the whole is changed, and the pressure intensity is changed to judge whether the air tightness is good or not, and the test method is different due to different devices. Can use the stainless steel pipe to make the gas package as the base member in the welding field, in the technique of disclosing at present, lack the steel pipe gas tightness verifying attachment, in case the unqualified steel pipe of gas tightness is put into production and use, can influence follow-up product shaping quality, is unfavorable for high-efficient production and processing.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an air tightness inspection machine of steel pipe to what put forward in solving above-mentioned background art can use nonrust steel pipe to make the gas bag as the base member in the welding field, in the open technique of present stage, lacks to steel pipe gas tightness verifying attachment, easily appears the unqualified steel pipe of gas tightness and is put into production and use, can influence follow-up product shaping quality, is unfavorable for the required problem of high-efficient production and processing.
In order to achieve the above object, the utility model provides a following technical scheme: the steel pipe air tightness inspection machine comprises a box body, wherein a steel pipe is arranged above the interior of the box body, four corners of the lower surface of the box body are fixedly connected with a support, a valve is fixedly connected to the lower surface of the box body, and a detection mechanism is arranged on the outer side of the steel pipe;
the detection mechanism comprises a conical plug, a cross rod, a vertical plate, a transverse plate, a thin tube, a transverse tube, a gasket, a first compression spring, a quick connector, a hose and a pressure gauge;
two the toper stopper is located the left and right sides of steel pipe respectively, the toper stopper offsets tightly, the right side with the steel pipe the right side rigid coupling of toper stopper has the horizontal pole, the diaphragm is located the below of steel pipe, the equal rigid coupling in the upper surface left and right sides of diaphragm has the riser, the right side the riser links to each other with the horizontal pole is fixed, the left side the inner wall rigid coupling of toper stopper has the tubule, the left side rigid coupling of tubule has violently the pipe, the outer wall of violently managing and the contact surface clearance fit of left side riser, the fixed gasket that has cup jointed of the outer wall right side tip of violently managing, the outer wall of violently managing has cup jointed first compression spring, first compression spring's both ends are fixed continuous with left side riser and gasket respectively, the left side tip rigid coupling of violently managing has quick connector, the left side of quick connector is.
Preferably, the distance between the inner ring of the first compression spring and the outer wall of the transverse pipe is 5-10 mm.
Preferably, an auxiliary mechanism is arranged below the transverse plate;
the auxiliary mechanism comprises a groove, a round rod, a sleeve, a second compression spring and an inclined rod;
two the recess is seted up respectively in the inside bottom left and right sides of box, the inside horizontal rigid coupling of recess has the round bar, the sleeve has been cup jointed to the outer wall of round bar, the second compression spring has been cup jointed to the outer wall opposite side of round bar, the both ends of second compression spring are fixed continuous with the contact surface of sleeve and recess respectively, telescopic top articulates there is the down tube, the other end and the diaphragm of down tube articulate and link to each other.
Preferably, the two inclined rods are symmetrical left and right relative to the central point of the transverse plate.
Preferably, the bottom end of the outer wall of the steel pipe is provided with a stability augmentation mechanism;
the stability augmentation mechanism comprises a supporting plate, a screw rod and a nut;
the upper surface of layer board and the outer wall bottom of steel pipe are supported tightly, the lower surface center rigid coupling of layer board has the screw rod, the screw rod runs through the diaphragm, the outer wall of screw rod and the contact surface clearance fit of diaphragm, the equal threaded connection in both sides has the nut about the outer wall of screw rod, the nut supports tightly with the contact surface of diaphragm.
Preferably, a temporary storage mechanism is arranged on the right side surface of the box body;
the temporary storage mechanism comprises a housing, a through hole and a water accumulation tank;
the water storage tank is arranged below the housing, and is connected with the lower part of the right outer wall surface of the box body.
Compared with the prior art, the beneficial effects of the utility model are that: this gas tightness inspection machine of steel pipe for traditional technique, has following advantage:
through the box, the steel pipe, and a support, the cooperation between valve and the detection mechanism, will violently manage outside pulling and make first compression spring compress between two toper stoppers distance increase, then will wait to detect the steel pipe and place between two toper stoppers, slowly loosen the effort to violently managing, first compression spring can kick-back and make two toper stoppers and the both sides of steel pipe offset tightly, then start at the air feeder with the hose outside, through violently managing and tubule to the inside pressurization operation that carries out of steel pipe, then submerging the inside clear water of box with the steel pipe downstream, during watch whether the gas production bubble can be waited to detect the gas tightness of steel pipe in the steel pipe outside and examine, the unqualified steel pipe of gas tightness is put into production and use to difficult appearance, can guarantee follow-up product shaping quality, do benefit to high-efficient production and processing.
Through the box, the steel pipe, and a support, the valve, cooperation between detection mechanism and the complementary unit, complementary unit can play the supporting role to the diaphragm, the operating personnel of being convenient for docks the installation between with steel pipe and the detection mechanism, need sneak into the inside clear water of box with the steel pipe when inside, with the diaphragm application of force downwards, transmission through the down tube can make the sleeve slide to the outside, can dive the steel pipe into the inside clear water of box, detect accomplish the back loosen the effort to the diaphragm can, can to a certain extent provide convenient for the detection personnel.
Through diaphragm, steel pipe and the cooperation between the steady mechanism that increases, the stability of steel pipe can be strengthened to the layer board, and through the upper and lower height of the steerable layer board of swivel nut, does benefit to the layer board and supports the steel pipe.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view showing a connection structure of the steel pipe and the detection mechanism of FIG. 1;
FIG. 3 is a schematic view of the connection structure of the case, the sleeve and the diagonal bar of FIG. 1;
fig. 4 is a schematic view of a connection structure of the conical plug, the fine tube and the transverse tube of fig. 2.
In the figure: 1. the device comprises a box body, 2, a steel pipe, 3, a support, 4, a valve, 5, a detection mechanism, 501, a conical plug, 502, a cross rod, 503, a vertical plate, 504, a transverse plate, 505, a thin pipe, 506, a transverse pipe, 507, a gasket, 508, a first compression spring, 509, a quick connector, 510, a hose, 511, a pressure gauge, 6, an auxiliary mechanism, 601, a groove, 602, a round rod, 603, a sleeve, 604, a second compression spring, 605, an inclined rod, 7, a temporary storage mechanism, 701, a housing, 702, a through hole, 703, a water accumulation box, 8, a stability enhancement mechanism, 801, a supporting plate, 802, a screw rod, 803 and a nut.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1-4, the present invention provides a technical solution: an air tightness inspection machine for steel pipes comprises a box body 1, steel pipes 2 are arranged above the interior of the box body 1, supports 3 are fixedly connected to four corners of the lower surface of the box body 1, valves 4 are fixedly connected to the lower surface of the box body 1, the valves 4 are communicated with the box body 1, a detection mechanism 5 is arranged on the outer side of each steel pipe 2, the detection mechanism 5 comprises a conical plug 501, cross rods 502, vertical plates 503, a transverse plate 504, thin pipes 505, a transverse pipe 506, a gasket 507, a first compression spring 508, a quick-connection joint 509, a hose 510 and a pressure gauge 511, the two conical plugs 501 are respectively arranged on the left side and the right side of each steel pipe 2, the conical plugs 501 are made of rubber materials and have certain toughness, the conical plugs 501 are abutted against the steel pipes 2, the cross rods 502 are fixedly connected to the right side of the right-side conical plug 501, the transverse plates 504 are arranged below the steel pipes 2, the vertical plates, the inner wall of the left conical plug 501 is fixedly connected with a thin tube 505, the left side of the thin tube 505 is fixedly connected with a horizontal tube 506, the horizontal tube 506 is communicated with the thin tube 505, the outer wall of the horizontal tube 506 is in clearance fit with the contact surface of the left vertical plate 503, the right side end of the outer wall of the horizontal tube 506 is fixedly sleeved with a gasket 507, the outer wall of the horizontal tube 506 is sleeved with a first compression spring 508, the coefficient of the first compression spring 508 is 5-30N/CM, two ends of the first compression spring 508 are fixedly connected with the contact surface of the left vertical plate 503 and the gasket 507 respectively, the left side end of the horizontal tube 506 is fixedly connected with a quick connector 509, the left side of the quick connector 509 is connected with a hose 510, the outer side end of the hose 510 is connected with an external air supply device, a pressure gauge 511 is installed at the top end of the left side of the outer wall of the horizontal tube 506, and the distance between the inner.
An auxiliary mechanism 6 is arranged below the transverse plate 504, the auxiliary mechanism 6 comprises grooves 601, round bars 602, sleeves 603, second compression springs 604 and inclined bars 605, the two grooves 601 are respectively arranged at the left side and the right side of the inner bottom end of the box body 1, the round bars 602 are transversely fixedly connected inside each groove 601, the sleeves 603 are sleeved on the outer walls of the round bars 602, the second compression springs 604 are sleeved on the outer walls of the round bars 602, the coefficient of the second compression springs 604 is 2-5N/CM, the two ends of the second compression springs 604 are respectively fixedly connected with the sleeves 603 and the side wall surfaces of the grooves 601, the inner walls of the sleeves 603 are in clearance fit with the outer walls of the round bars 602, the sleeves 603 in the left groove 601 inside the box body 1 are close to the right inner wall of the left groove 601, the sleeves 603 in the right groove 601 inside the box body 1 are close to the left inner wall of the right groove 601, and the top ends, the other end of the inclined rod 605 is hinged with the horizontal plate 504, and the two inclined rods 605 are symmetrical left and right relative to the central point of the horizontal plate 504, so that the two inclined rods 605 can uniformly apply force to the horizontal plate 504.
The outer wall bottom of steel pipe 2 is equipped with and increases steady mechanism 8, it includes layer board 801 to increase steady mechanism 8, screw rod 802 and nut 803, the upper surface of layer board 801 offsets tightly with the outer wall bottom of steel pipe 2, the lower surface center rigid coupling of layer board 801 has screw rod 802, screw rod 802 runs through horizontal board 504, the outer wall of screw rod 802 and the contact surface clearance fit of horizontal board 504, the equal threaded connection of both sides has nut 803 about the outer wall of screw rod 802, accompany horizontal board 504 between upper and lower both sides threaded nut 803, upper and lower both sides threaded nut 803 adjusting position can make the relative height change of horizontal board 504 of layer board 801, press from both sides tight horizontal board 504 between upper and lower both sides threaded nut 803, the stability of multipl.
The right side surface of the box body 1 is provided with a temporary storage mechanism 7, the temporary storage mechanism 7 comprises a housing 701, a through hole 702 and a water accumulation tank 703, the housing 701 is fixedly connected above the right surface of the box body 1, the lower surface of the housing 701 is provided with a plurality of through holes 702, the water accumulation tank 703 is arranged below the housing 701, and the water accumulation tank 703 is connected with the lower part of the right surface of the box body 1.
When the steel pipe air tightness tester is used, the transverse pipe 506 is pulled towards the left side, so that the first compression spring 508 is compressed, and the distance between the two conical plugs 501 is increased; then, a steel pipe 2 to be detected is placed between the two conical plugs 501, the steel pipe 2 to be detected is placed on a supporting plate 801 of the stability enhancement mechanism 8, the height of the steel pipe 2 can be realized by adjusting the height of the supporting plate 801, in order to realize that the sealing performance of the two conical plugs 501 on the two ends of the steel pipe 2 is optimal, the height of the steel pipe 2 needs to be adjusted to ensure that the central axis of the steel pipe 2 is superposed with the central axis of the conical plugs 501, the central axes of the two conical plugs 501 are superposed, the acting force on the horizontal pipe 506 towards the left side is slowly released, the first compression spring 508 rebounds to enable the two conical plugs 501 to be abutted against the two sides of the steel pipe 2, then, an air supply device on the outer side of the hose 510 is started, the transverse pipe 506 and the thin pipe 505 are used for pressurizing operation towards the inside of the steel pipe 2, at the moment, the transverse plate 504 is arranged on the upper part of the, until steel pipe 2 immerses the inside clear water of box 1, see whether the steel pipe 2 outside produces the bubble this moment, whether airtight of detectable steel pipe 2 is qualified like this, the unqualified steel pipe of gas tightness will be difficult for appearing like this and put into production and use, detect and stop the air feed operation with external air feeder after accomplishing, cancel the decurrent effort to diaphragm 504 simultaneously, do the effort of extension deformation at second compression spring 604 under, diaphragm 504 can emerge the inside surface of water of box 1, outside pulling of violently pipe 506 will be violently managed after the pressure release of steel pipe 2 is accomplished, make two toper stopper 501 and steel pipe phase separation, place steel pipe 2 after will detecting and accomplish inside at housing 701 and carry out temporary storage, the water stain of remaining in the steel pipe 2 outside can flow into ponding case 703 through-hole 702 inside, do benefit to operating personnel control inspection machine operational environment convenient to use widely around.
In the description of the present invention, it is to be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "one side", "top", "inner", "front", "center", "both ends", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "disposed," "connected," "fixed," "screwed" and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through an intermediate medium, and may be connected through the inside of two elements or in an interaction relationship between two elements, unless otherwise specifically defined, and the specific meaning of the above terms in the present invention will be understood by those skilled in the art according to specific situations.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides an air tightness inspection machine of steel pipe, includes box (1), its characterized in that: a steel pipe (2) is arranged above the inner part of the box body (1), four corners of the lower surface of the box body (1) are fixedly connected with a support (3), a valve (4) is fixedly connected with the lower surface of the box body (1), and a detection mechanism (5) is arranged on the outer side of the steel pipe (2);
the detection mechanism (5) comprises a conical plug (501), a cross rod (502), a vertical plate (503), a horizontal plate (504), a thin tube (505), a horizontal tube (506), a gasket (507), a first compression spring (508), a quick connector (509), a hose (510) and a pressure gauge (511);
two toper stopper (501) are located the left and right sides of steel pipe (2) respectively, toper stopper (501) offsets tightly with steel pipe (2), the right side rigid coupling of toper stopper (501) has horizontal pole (502), diaphragm (504) are located the below of steel pipe (2), the equal rigid coupling in upper surface left and right sides of diaphragm (504) has riser (503), the right side riser (503) are fixed continuous with horizontal pole (502), the left side the inner wall rigid coupling of toper stopper (501) has tubule (505), the left side rigid coupling of tubule (505) has violently pipe (506), the contact surface clearance fit of the outer wall of violently pipe (506) and left side riser (503), gasket (507) has been fixed to cup jointed to the outer wall right side tip of violently pipe (506), the outer wall of violently pipe (506) has cup jointed first compression spring (508), the both ends of first compression spring (508) are fixed continuous with left side riser (503) and gasket (507) respectively, the left end of the transverse pipe (506) is fixedly connected with a quick connector (509), the left side of the quick connector (509) is connected with a hose (510), and the top end of the left side of the outer wall of the transverse pipe (506) is provided with a pressure gauge (511).
2. The machine for checking the airtightness of a steel pipe according to claim 1, wherein: the distance between the inner ring of the first compression spring (508) and the outer wall of the transverse pipe (506) is 5-10 mm.
3. The machine for checking the airtightness of a steel pipe according to claim 1, wherein: an auxiliary mechanism (6) is arranged below the transverse plate (504);
the auxiliary mechanism (6) comprises a groove (601), a round rod (602), a sleeve (603), a second compression spring (604) and a diagonal rod (605);
two recess (601) are seted up respectively in the inside bottom left and right sides of box (1), the inside horizontal rigid coupling of recess (601) has round bar (602), sleeve (603) have been cup jointed to the outer wall of round bar (602), second compression spring (604) have been cup jointed to the outer wall of round bar (602), the both ends of second compression spring (604) are fixed continuous with the contact surface of sleeve (603) and recess (601) respectively, the top of sleeve (603) articulates there is down tube (605), the other end and diaphragm (504) of down tube (605) articulate and link to each other.
4. The machine for checking the airtightness of a steel pipe according to claim 3, wherein: the two inclined rods (605) are symmetrical left and right relative to the central point of the transverse plate (504).
5. The machine for checking the airtightness of a steel pipe according to claim 1, wherein: the bottom end of the outer wall of the steel pipe (2) is provided with a stability augmentation mechanism (8);
the stability augmentation mechanism (8) comprises a supporting plate (801), a screw rod (802) and a nut (803);
the upper surface of layer board (801) offsets tightly with the outer wall bottom of steel pipe (2), the lower surface center rigid coupling of layer board (801) has screw rod (802), diaphragm (504) are run through in screw rod (802), the outer wall of screw rod (802) and the contact surface clearance fit of diaphragm (504), equal threaded connection in both sides has nut (803) about the outer wall of screw rod (802), nut (803) offsets tightly with the contact surface of diaphragm (504).
6. The machine for checking the airtightness of a steel pipe according to claim 1, wherein: a temporary storage mechanism (7) is arranged on the right side surface of the box body (1);
the temporary storage mechanism (7) comprises a housing (701), a through hole (702) and a water accumulation tank (703);
the water storage tank is characterized in that the housing (701) is fixedly connected above the right surface of the box body (1), a plurality of through holes (702) are formed in the lower surface of the housing (701), the water storage tank (703) is arranged below the housing (701), and the water storage tank (703) is connected with the lower portion of the right outer wall surface of the box body (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021856286.0U CN213022160U (en) | 2020-08-31 | 2020-08-31 | Air tightness inspection machine for steel pipes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021856286.0U CN213022160U (en) | 2020-08-31 | 2020-08-31 | Air tightness inspection machine for steel pipes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213022160U true CN213022160U (en) | 2021-04-20 |
Family
ID=75473352
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021856286.0U Active CN213022160U (en) | 2020-08-31 | 2020-08-31 | Air tightness inspection machine for steel pipes |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213022160U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113523726A (en) * | 2021-07-29 | 2021-10-22 | 上海金棋建筑工程设备有限公司 | Building steel pipe welding method |
| CN116989946A (en) * | 2023-09-27 | 2023-11-03 | 山东美晨工业集团有限公司 | Automobile rubber tube tightness detection device |
| CN117168703A (en) * | 2023-11-01 | 2023-12-05 | 山东聊城九阳钢管制造有限公司 | Steel pipe gas tightness detection device |
-
2020
- 2020-08-31 CN CN202021856286.0U patent/CN213022160U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113523726A (en) * | 2021-07-29 | 2021-10-22 | 上海金棋建筑工程设备有限公司 | Building steel pipe welding method |
| CN113523726B (en) * | 2021-07-29 | 2023-12-19 | 金工建设集团股份有限公司 | Construction steel pipe welding method |
| CN116989946A (en) * | 2023-09-27 | 2023-11-03 | 山东美晨工业集团有限公司 | Automobile rubber tube tightness detection device |
| CN117168703A (en) * | 2023-11-01 | 2023-12-05 | 山东聊城九阳钢管制造有限公司 | Steel pipe gas tightness detection device |
| CN117168703B (en) * | 2023-11-01 | 2024-02-06 | 山东聊城九阳钢管制造有限公司 | Steel pipe gas tightness detection device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN213022160U (en) | Air tightness inspection machine for steel pipes | |
| WO2022267075A1 (en) | Pipe pressure resistance testing device and testing method thereof | |
| CN109738129B (en) | Method for detecting air tightness of conduit assembly | |
| CN116577040B (en) | Ammeter leakproofness detection device | |
| CN211927178U (en) | Gas drive urea nozzle air tightness test platform | |
| CN219121645U (en) | Metal seal gas tightness check out test set | |
| CN217304274U (en) | Thermal power station valve sealing performance detection device and pressurization and fixing mechanism thereof | |
| CN212482826U (en) | Water pressure test equipment for detecting finished stainless steel welded pipe | |
| CN211784106U (en) | High-pressure tank airtightness detection device | |
| CN216050551U (en) | Unloading hose pressure test tool | |
| CN213932978U (en) | Airtight detection device of aluminum alloy counter-pressure casting stalk | |
| CN219201187U (en) | Withstand voltage testing device for cast elbow | |
| CN215217956U (en) | Friction welding pneumatic detection clamp | |
| CN211740515U (en) | Socket connector angle test device | |
| CN212133997U (en) | Lithium battery cover plate sealing welding air tightness and welding seam compressive strength detection device | |
| CN220104249U (en) | Water meter pressure testing device | |
| CN112268660A (en) | Airtight detection device of aluminum alloy counter-pressure casting stalk | |
| CN218823037U (en) | Pipeline air tightness detection device | |
| CN216746625U (en) | Pressure test device for gas storage bottle | |
| CN212683696U (en) | Automatic fire extinguisher maintenance device for special vehicle | |
| CN113108981B (en) | Pressure measuring device for porous probe | |
| CN218674066U (en) | Air tightness detection device of humidifier water tank | |
| CN214502804U (en) | Air tightness testing device for container | |
| CN109084940A (en) | A kind of Portable valve leakage detection apparatus | |
| CN214748723U (en) | Small-size pressure vessel detection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |