CN212070305U - Differential mechanism riveting stamping device - Google Patents
Differential mechanism riveting stamping device Download PDFInfo
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- CN212070305U CN212070305U CN202020822376.1U CN202020822376U CN212070305U CN 212070305 U CN212070305 U CN 212070305U CN 202020822376 U CN202020822376 U CN 202020822376U CN 212070305 U CN212070305 U CN 212070305U
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- driven gear
- riveting
- differential case
- oil cylinder
- differential
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Abstract
A riveting and stamping device for a differential mechanism comprises a support frame, a riveting table connected below the support frame and a stamping block connected above the support frame, wherein the support frame, the riveting table and the stamping block are connected in a C shape; the riveting table comprises a lower die, a driven gear and a differential mechanism shell, wherein the driven gear and the differential mechanism shell are arranged on the lower die and subjected to stamping riveting; the stamping block comprises a main cylinder and an upper die connected below the main cylinder, and the upper die has the action of approaching or separating from the lower die under the telescopic action of the main cylinder. The utility model discloses a differential mechanism riveting stamping device sets up driven gear backpressure stabilizing oil cylinder and differential mechanism casing backpressure stabilizing oil cylinder on lower mould and last mould respectively to through pressure regulating overflow valve control pressure size assurance working order, make riveted driven gear and differential mechanism casing atress keep at stable condition gradually, and make the riveting process more steady, the rivet atress is more balanced, guarantees the riveting quality.
Description
Technical Field
The utility model relates to a differential mechanism casing and driven gear's jointing equipment field, more specifically the saying so relates to a differential mechanism riveting stamping device.
Background
The bolt connection is the most common combination of components in machinery, and once the design is not reasonable or the fastening is not reasonable, the failure of damaging machine parts can occur, and particularly, the machine parts are easy to fall off due to vibration and the like in actual use, so that unnecessary loss is caused. At present, the automobile differential and the driven gear are connected by bolts, the product quality has potential safety hazards, and in order to improve the connection stability of the differential and the driven gear, the mode of replacing the bolts by riveting is slowly generated. The riveting efficiency can be greatly improved by the aid of the punching riveting mode, but most of the existing riveting modes are that workpieces are placed on a press machine and are directly pressed and riveted by a main cylinder, if the workpieces are placed slightly or unbalanced in stress, the rivets are easily pressed askew, the workpieces or the rivets can be broken even in serious conditions, and the rejection rate is higher. Therefore, how to improve the stability in the riveting process becomes an urgent problem to be solved.
SUMMERY OF THE UTILITY MODEL
The weak point to prior art the utility model provides a differential mechanism riveting stamping device, the utility model discloses a differential mechanism riveting stamping device sets up driven gear backpressure stabilizing oil cylinder and differential mechanism casing backpressure stabilizing oil cylinder respectively on lower mould and last mould to guarantee the operating sequence through pressure regulating overflow valve control pressure size, make riveted driven gear and differential mechanism casing atress keep at stable condition gradually, and make the riveting process more steady, the rivet atress is more balanced, guarantees the riveting quality.
The technical scheme of the utility model is as follows, a differential riveting stamping device comprises a support frame, a riveting table connected below the support frame and a stamping block connected above the support frame, wherein the support frame, the riveting table and the stamping block are connected in a C shape;
the riveting table comprises a lower die, a driven gear and a differential mechanism shell, wherein the driven gear and the differential mechanism shell are arranged on the lower die and subjected to stamping riveting;
the stamping block comprises a main cylinder and an upper die connected below the main cylinder, and the upper die has the action of approaching or separating from the lower die under the telescopic action of the main cylinder.
The driven gear and the differential shell are provided with riveting holes opposite in position, the driven gear and the differential shell are arranged on the lower die and then are positioned through a positioning tool, rivets are placed in the riveting holes after positioning is completed, and the upper die is pressed by the main cylinder to be close to the lower die so as to complete punching of the rivets under the condition that the driven gear and the differential shell are stable.
As the optimization of the utility model, the lower die comprises a lower die plate, and a guide pillar, a driven gear back pressure stabilizing oil cylinder, a lower punch and an ejection oil cylinder which are integrally matched and connected with the lower die plate; the guide post is at least provided with four circumferential arrays and is matched and connected with the excircle of the driven gear, the driven gear backpressure stabilizing oil cylinder is at least provided with four circumferential arrays, the ejecting ends of the piston rods are positioned on the same horizontal plane, the number and the installation positions of the lower punches are opposite to the riveting holes of the driven gear, and the upward ejecting end of the ejecting oil cylinder is opposite to the central position of the driven gear.
As the optimization of the utility model, the upper die comprises a slide block, an upper punch head, a back pressure stabilizing oil cylinder of the differential shell and a stabilizing sleeve of the differential shell, wherein the upper punch head, the back pressure stabilizing oil cylinder of the differential shell and the stabilizing sleeve of the differential shell are integrally matched and connected with the slide block; the number of the upper punch heads and the installation positions of the upper punch heads are opposite to the riveting holes of the differential shell, the downward ejection end of the back pressure stabilizing oil cylinder of the differential shell is opposite to the central position of the differential shell, the stabilizing sleeve of the differential shell is connected to the lower part of the back pressure stabilizing oil cylinder of the differential shell, and the concave surface of the lower part of the stabilizing sleeve of the differential shell is matched with the surface shape of the upper surface of the differential shell.
As the utility model discloses a preferred, the hydro-cylinder oil inlet is stabilized to driven gear backpressure links to each other, and is controlled by first switching-over valve, first switching-over valve with it can only toward to be equipped with messenger's fluid on the oil circuit between the hydro-cylinder is stabilized to driven gear backpressure the first check valve that the hydro-cylinder direction was flowed is stabilized to driven gear backpressure, just first check valve with be equipped with first relief valve and a remote control overflow valve on the oil circuit between the hydro-cylinder is stabilized to driven gear backpressure.
The first reversing valve is a two-position four-way electromagnetic reversing valve and can be easily controlled by a controller; the first check valve ensures that the driven gear back pressure stabilizing oil cylinder is stabilized at an extending position, and the driven gear back pressure stabilizing oil cylinder only starts to retract when the bearing weight exceeds the pressure of the first remote control overflow valve or the first safety valve; the first safety valve is used for ensuring the back pressure of the driven gear to stabilize the maximum pressure of the oil cylinder; the first remote control overflow valve is connected to a control position through an oil pipe and used for conveniently adjusting the pressure of the driven gear back pressure stabilizing oil cylinder, and when the set pressure of the first remote control overflow valve exceeds the pressure of the first safety valve or clamping stagnation occurs, oil overflows from the first safety valve to ensure the use safety.
As the utility model discloses a preferred, the hydro-cylinder is stabilized to differential mechanism casing backpressure is controlled by the second switching-over valve, the second switching-over valve with it can only toward to be equipped with messenger's fluid on the oil circuit between the hydro-cylinder is stabilized to differential mechanism casing backpressure the second check valve that the hydro-cylinder direction was flowed is stabilized to differential mechanism casing backpressure, just the second check valve with be equipped with second relief valve and the second remote control overflow valve on the oil circuit between the hydro-cylinder is stabilized to differential mechanism casing backpressure.
The second reversing valve is a two-position four-way electromagnetic reversing valve and can be easily controlled by a controller; the second check valve ensures that the back pressure stabilizing oil cylinder of the differential case is stabilized at an extending position, and the differential case starts to retract only when the bearing weight exceeds the pressure of the second remote control overflow valve or the second safety valve; the second safety valve is used for ensuring the back pressure of the differential shell to stabilize the maximum pressure of the oil cylinder; and the second remote control overflow valve is connected to a control position through an oil pipe and is used for conveniently adjusting the pressure of the back pressure stabilizing oil cylinder of the differential shell, and when the set pressure of the second remote control overflow valve exceeds the pressure of the second safety valve or clamping stagnation occurs, oil overflows from the second safety valve to ensure the use safety.
Preferably, the set pressure of the first safety valve and the second safety valve is 3-7 MPa; the first remote control overflow valve is adjustable at least within the range of the highest set pressure of the first safety valve, and the second remote control overflow valve is adjustable at least within the range of the highest set pressure of the second safety valve.
Preferably, when the first remote control overflow valve is opened, the acting force of the differential shell backpressure stabilizing oil cylinder on the driven gear and the differential shell is smaller than the acting force of the driven gear backpressure stabilizing oil cylinder on the driven gear and the differential shell when the second remote control overflow valve is opened;
the acting force of the master cylinder on the driven gear and the differential shell is larger than the acting force of the differential shell back pressure stabilizing oil cylinder on the driven gear and the differential shell;
the acting force of the ejection oil cylinder on the driven gear and the differential shell is larger than the gravity of the driven gear and the differential shell.
Therefore, when the differential shell back pressure stabilizing oil cylinder retracts, the driven gear back pressure stabilizing oil cylinder still keeps a supporting state, and the stability of a riveting part is maintained; the ejection oil cylinder extends out after riveting is completed to jack up the riveted part, so that materials can be conveniently taken.
As the utility model discloses an prefer, when the lower punch just began the contact state with the rivet below, the decurrent stroke of driven gear back pressure stabilizing oil jar is 2mm-5 mm.
Therefore, the action stroke of the main cylinder on the rivet stamping in a high-pressure state is 2mm-5mm at most, the inclination of a workpiece is corrected while the deformation stroke of riveting is ensured, the deformation of the deformed part of the rivet is uniform, and the riveting quality is ensured.
As the utility model discloses a preferred, still install location frock on the riveting bench, location frock includes rotatory inserted bar and blocks the strip, rotatory inserted bar with block the strip when leaning on mutually downwards male position with one of them riveting hole position of driven gear is relative.
Through the positioning tool, the accuracy of the differential shell relative to the riveting hole of the driven gear is improved, and the riveting quality is improved.
To sum up, the utility model discloses following beneficial effect has:
the utility model discloses a differential mechanism riveting stamping device sets up driven gear backpressure stabilizing oil cylinder and differential mechanism casing backpressure stabilizing oil cylinder on lower mould and last mould respectively to through pressure regulating overflow valve control pressure size assurance working order, make riveted driven gear and differential mechanism casing atress keep at stable condition gradually, and make the riveting process more steady, the rivet atress is more balanced, guarantees the riveting quality.
Drawings
Fig. 1 is a side view of the differential riveting and stamping device of the present invention;
FIG. 2 is a perspective view of the differential riveting and stamping device of the present invention with parts mounted on the lower mold;
FIG. 3 is a front view of the parts of the riveting and stamping device for a differential mechanism of the present invention mounted on a lower mold;
FIG. 4 is a front view of the lower die and the upper die when the main cylinder of the differential riveting and stamping device of the present invention is lifted;
FIG. 5 is a front view of the lower mold and the upper mold when the main cylinder of the differential riveting and stamping device of the present invention is pressed downward;
FIG. 6 is a hydraulic schematic diagram of the riveting and stamping device of the differential mechanism of the present invention;
in the figure, 1-supporting frame, 2-riveting table, 21-lower die, 211-lower die plate, 212-guide post, 213-driven gear backpressure stabilizing oil cylinder, 213 a-first reversing valve, 213 b-first check valve, 213 c-first safety valve, 213 d-first remote control overflow valve, 214-lower punch, 215-ejection oil cylinder, 22-driven gear, 23-differential housing, 24-positioning tool, 241-rotary inserted rod, 242-blocking strip, 3-punching block, 31-main cylinder, 32-upper die, 321-slide block, 322-upper punch, 323-differential housing backpressure stabilizing oil cylinder, 323 a-second reversing valve, 323 b-second check valve, 323 c-second safety valve, 323 d-second remote control overflow valve, 324 — differential case stabilizer sleeve.
Detailed Description
The present invention will be further explained by the following embodiments with reference to the attached drawings.
As shown in fig. 1, the differential riveting and stamping device comprises a support frame 1, a riveting table 2 connected below the support frame 1 and a stamping block 3 connected above the support frame 1, wherein the support frame 1, the riveting table 2 and the stamping block 3 are connected in a C shape;
the riveting table 2 comprises a lower die 21, a driven gear 22 and a differential case 23 which are arranged on the lower die 21 and are subjected to stamping riveting;
the punch block 3 includes a master cylinder 31 and an upper die 32 connected to a lower portion of the master cylinder 31, and the upper die 32 moves toward or away from the lower die 21 by the expansion and contraction of the master cylinder 31.
Riveting holes with opposite positions are formed in the driven gear 22 and the differential case 23, the driven gear 22 and the differential case 23 are installed on the lower die 21 and then are positioned through a positioning tool, rivets are placed in the riveting holes after positioning is finished, and the upper die 32 is pressed down by the main cylinder 31 to be close to the lower die 21 so that punching of the rivets is finished under the condition that the driven gear 22 and the differential case 23 are stable.
As shown in fig. 2, 3, 4 and 5, the lower die 21 includes a lower die plate 211, and a guide post 212, a driven gear back pressure stabilizing cylinder 213, a lower punch 214 and an ejection cylinder 215 which are integrally connected with the lower die plate 211 in a matching manner; the guide post 212 is at least provided with four circumferential arrays and is matched and connected with the excircle of the driven gear 22, the driven gear backpressure stabilizing oil cylinder 213 is at least provided with four circumferential arrays, the ejection ends of the piston rods are positioned on the same horizontal plane, the number and the installation positions of the lower punches 214 are opposite to the riveting holes of the driven gear 22, and the upward ejection end of the ejection oil cylinder 215 is opposite to the central position of the driven gear 22.
As shown in fig. 4 and 5, the upper die 32 includes a slide block 321, and an upper punch 322, a differential case back pressure stabilizing cylinder 323, and a differential case stabilizing sleeve 324 that are integrally connected with the slide block 321; the number and the installation position of the upper punches 322 are opposite to the riveting holes of the differential case 23, the downward ejection end of the back pressure stabilizing oil cylinder 323 of the differential case is opposite to the central position of the differential case 23, the stabilizing sleeve 324 of the differential case is connected below the back pressure stabilizing oil cylinder 323 of the differential case, and the concave surface below the stabilizing sleeve 324 of the differential case is matched with the shape of the upper surface of the differential case 23.
As shown in fig. 6, the oil inlet of the driven gear back pressure stabilizing cylinder 213 is connected and controlled by a first direction changing valve 213a, a first check valve 213b is disposed on the oil path between the first direction changing valve 213a and the driven gear back pressure stabilizing cylinder 213 to make the oil flow only in the direction of the driven gear back pressure stabilizing cylinder 213, and a first relief valve 213c and a first remote control overflow valve 213d are disposed on the oil path between the first check valve 213b and the driven gear back pressure stabilizing cylinder 213.
The first directional valve 213a is a two-position four-way electromagnetic directional valve and can be easily controlled by a controller; the first check valve 213b ensures that the driven gear back pressure stabilizing cylinder 213 is stabilized at the extended position, and retraction is started only when the bearing weight exceeds the pressure of the first remote control relief valve 213d or the first relief valve 213 c; the first relief valve 213c is used to ensure that the driven gear back pressure stabilizes the maximum pressure of the cylinder 213; the first remote control overflow valve 213d is connected to the control position through an oil pipe and is used for conveniently adjusting the pressure of the driven gear back pressure stabilizing oil cylinder 213, and when the set pressure of the first remote control overflow valve 213d exceeds the pressure of the first safety valve 213c or clamping stagnation occurs, the oil overflows from the first safety valve 213c to ensure the use safety.
As shown in fig. 6, the differential case back pressure stabilizing cylinder 323 is controlled by a second direction changing valve 323a, a second check valve 323b for making the oil flow only in the direction of the differential case back pressure stabilizing cylinder 323 is provided on the oil path between the second direction changing valve 323a and the differential case back pressure stabilizing cylinder 323, and a second relief valve 323c and a second remote control relief valve 323d are provided on the oil path between the second check valve 323b and the differential case back pressure stabilizing cylinder 323.
The second reversing valve 323a is a two-position four-way electromagnetic reversing valve and can be easily controlled by a controller; the second check valve 323b ensures that the back pressure stabilizing oil cylinder 323 of the differential case is stabilized at the extending position, and the retraction is started only when the bearing weight exceeds the pressure of the second remote control overflow valve 323d or the second safety valve 323 c; the second relief valve 323c is used to ensure that the differential case back pressure stabilizes the maximum pressure of the cylinder 323; the second remote control overflow valve 323d is connected to the control position through an oil pipe and is used for conveniently adjusting the pressure of the back pressure stabilizing oil cylinder 323 of the differential case, and when the set pressure of the second remote control overflow valve 323d exceeds the pressure of the second safety valve 323c or clamping stagnation occurs, the oil overflows from the second safety valve 323c to ensure the use safety.
The set pressure of the first relief valve 213c and the second relief valve 323c is 3 to 7 MPa; the first remote control relief valve 213d is adjustable at least within a range of the maximum set pressure of the first relief valve 213c, and the second remote control relief valve 323d is adjustable at least within a range of the maximum set pressure of the second relief valve 323 c.
When the first remote-control overflow valve 213d is opened, the acting force of the differential case back pressure stabilizing oil cylinder 323 on the driven gear 22 and the differential case 23 is smaller than the acting force of the driven gear back pressure stabilizing oil cylinder 213 on the driven gear 22 and the differential case 23 when the second remote-control overflow valve 323d is opened;
the acting force of the master cylinder 31 on the driven gear 22 and the differential case 23 is larger than the acting force of the differential case back pressure stabilizing cylinder 323 on the driven gear 22 and the differential case 23;
the force of the ejection cylinder 215 on the driven gear 22 and the differential case 23 is greater than the weight of the driven gear 22 and the differential case 23.
Therefore, the driven gear back pressure stabilizing oil cylinder 213 keeps a supporting state when the differential housing back pressure stabilizing oil cylinder 323 retracts, and stability of a riveting part is maintained; the ejection oil cylinder 215 extends out after riveting is completed to jack up the riveted part, so that materials can be taken conveniently.
When the lower punch 214 and the lowest part of the rivet are in a contact state, the downward stroke of the driven gear back pressure stabilizing oil cylinder 213 is 2mm-5 mm.
Therefore, the action stroke of the main cylinder 31 on the rivet stamping in a high-pressure state is 2mm-5mm at most, the inclination of a workpiece is corrected while the deformation stroke of riveting is ensured, the deformation amount of the deformed part of the rivet is uniform, and the riveting quality is ensured.
As shown in fig. 2 and 3, a positioning tool 24 is further mounted on the riveting station 2, the positioning tool 24 includes a rotary insertion rod 241 and a stop bar 242, and a position where the rotary insertion rod 241 is inserted downward when abutting against the stop bar 242 is opposite to one of the riveting holes of the driven gear 22.
The accuracy of the relative riveting holes of the differential case 23 and the driven gear 22 is improved through the positioning tool 24, and the riveting quality is improved.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention and are not intended to limit the spirit and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made by the technical solution of the present invention by those skilled in the art should fall into the protection scope of the present invention, and the technical contents claimed by the present invention have been fully recorded in the claims.
Claims (9)
1. The utility model provides a differential mechanism riveting stamping device which characterized in that: the riveting device comprises a support frame (1), a riveting table (2) connected below the support frame (1) and a stamping block (3) connected above the support frame (1), wherein the support frame (1), the riveting table (2) and the stamping block (3) are connected in a C shape;
the riveting table (2) comprises a lower die (21), a driven gear (22) and a differential case (23), wherein the driven gear (22) and the differential case are mounted on the lower die (21) and are subjected to stamping riveting;
the punching block (3) comprises a main cylinder (31) and an upper die (32) connected below the main cylinder (31), wherein the upper die (32) moves close to or away from the lower die (21) under the expansion and contraction action of the main cylinder (31).
2. The differential riveting stamping device of claim 1, wherein: the lower die (21) comprises a lower die plate (211), and a guide post (212), a driven gear back pressure stabilizing oil cylinder (213), a lower punch (214) and an ejection oil cylinder (215) which are integrally matched and connected with the lower die plate (211); the guide post (212) is at least provided with four circumferential arrays and is matched and connected with the excircle of the driven gear (22), the driven gear backpressure stabilizing oil cylinder (213) is at least provided with four circumferential arrays, the ejecting ends of the piston rods are positioned on the same horizontal plane, the number and the installation positions of the lower punches (214) are opposite to the riveting holes of the driven gear (22), and the upward ejecting end of the ejecting oil cylinder (215) is opposite to the central position of the driven gear (22).
3. The differential riveting stamping device of claim 2, wherein: the upper die (32) comprises a sliding block (321), an upper punch head (322) which is integrally matched and connected with the sliding block (321), a differential case back pressure stabilizing oil cylinder (323) and a differential case stabilizing sleeve (324); the number and the installation positions of the upper punches (322) are opposite to the riveting holes of the differential case (23), the downward ejection end of the back pressure stabilizing oil cylinder (323) of the differential case is opposite to the central position of the differential case (23), the stabilizing sleeve (324) of the differential case is connected below the back pressure stabilizing oil cylinder (323) of the differential case, and the concave surface below the stabilizing sleeve (324) of the differential case is matched with the shape of the upper surface of the differential case (23).
4. A differential riveting stamping device according to claim 3, wherein: the oil inlet of the driven gear back pressure stabilizing oil cylinder (213) is connected and is controlled by a first reversing valve (213a), the first reversing valve (213a) is provided with a first one-way valve (213b) which enables oil to flow only in the direction of the driven gear back pressure stabilizing oil cylinder (213) on an oil way between the driven gear back pressure stabilizing oil cylinder (213), and the first one-way valve (213b) is provided with a first safety valve (213c) and a first remote control overflow valve (213d) on the oil way between the driven gear back pressure stabilizing oil cylinder (213).
5. The differential riveting stamping device of claim 4, wherein: the differential case back pressure stabilizing oil cylinder (323) is controlled by a second reversing valve (323a), a second one-way valve (323b) enabling oil to flow only in the direction of the differential case back pressure stabilizing oil cylinder (323) is arranged on an oil path between the second reversing valve (323a) and the differential case back pressure stabilizing oil cylinder (323), and a second safety valve (323c) and a second remote control overflow valve (323d) are arranged on the oil path between the second one-way valve (323b) and the differential case back pressure stabilizing oil cylinder (323).
6. The differential riveting stamping device of claim 5, wherein: the set pressure of the first relief valve (213c) and the second relief valve (323c) is 3-7 MPa; the first remote control relief valve (213d) is adjustable at least within a range of a maximum set pressure of the first relief valve (213c), and the second remote control relief valve (323d) is adjustable at least within a range of a maximum set pressure of the second relief valve (323 c).
7. The differential riveting stamping device of claim 6, wherein: the acting force of the differential case back pressure stabilizing oil cylinder (323) on the driven gear (22) and the differential case (23) when the first remote control overflow valve (213d) is opened is smaller than the acting force of the driven gear back pressure stabilizing oil cylinder (213) on the driven gear (22) and the differential case (23) when the second remote control overflow valve (323d) is opened;
the acting force of the master cylinder (31) on the driven gear (22) and the differential case (23) is larger than the acting force of the differential case back pressure stabilizing cylinder (323) on the driven gear (22) and the differential case (23);
the acting force of the ejection cylinder (215) on the driven gear (22) and the differential case (23) is greater than the gravity of the driven gear (22) and the differential case (23).
8. The differential riveting stamping device of claim 2, wherein: when the lower punch (214) and the lowest part of the rivet just start to contact, the downward stroke of the driven gear back pressure stabilizing oil cylinder (213) is 2mm-5 mm.
9. The differential riveting stamping device of claim 1, wherein: still install location frock (24) on riveting platform (2), location frock (24) are including rotatory inserted bar (241) and stop strip (242), rotatory inserted bar (241) with stop strip (242) when leaning on down the inserted position with one of them riveting hole position of driven gear (22) is relative.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020822376.1U CN212070305U (en) | 2020-05-18 | 2020-05-18 | Differential mechanism riveting stamping device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020822376.1U CN212070305U (en) | 2020-05-18 | 2020-05-18 | Differential mechanism riveting stamping device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212070305U true CN212070305U (en) | 2020-12-04 |
Family
ID=73567857
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020822376.1U Expired - Fee Related CN212070305U (en) | 2020-05-18 | 2020-05-18 | Differential mechanism riveting stamping device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212070305U (en) |
-
2020
- 2020-05-18 CN CN202020822376.1U patent/CN212070305U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201204 |