CN113787329B - Clamp for processing sealing pipe orifice error-proof boss of engine pipe fitting - Google Patents
Clamp for processing sealing pipe orifice error-proof boss of engine pipe fitting Download PDFInfo
- Publication number
- CN113787329B CN113787329B CN202111002552.2A CN202111002552A CN113787329B CN 113787329 B CN113787329 B CN 113787329B CN 202111002552 A CN202111002552 A CN 202111002552A CN 113787329 B CN113787329 B CN 113787329B
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- engine
- pipe fitting
- sealing
- positioning
- pipe
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- 238000007789 sealing Methods 0.000 title claims abstract description 77
- 238000012545 processing Methods 0.000 title claims abstract description 22
- 230000007246 mechanism Effects 0.000 claims abstract description 30
- 230000009471 action Effects 0.000 claims abstract description 9
- 230000002093 peripheral effect Effects 0.000 claims abstract description 8
- 238000003754 machining Methods 0.000 claims description 18
- 238000000034 method Methods 0.000 description 13
- 230000008569 process Effects 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
- B23P19/04—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for assembling or disassembling parts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25H—WORKSHOP EQUIPMENT, e.g. FOR MARKING-OUT WORK; STORAGE MEANS FOR WORKSHOPS
- B25H1/00—Work benches; Portable stands or supports for positioning portable tools or work to be operated on thereby
- B25H1/08—Work benches; Portable stands or supports for positioning portable tools or work to be operated on thereby with provision for attachment of work holders
Abstract
The invention discloses a clamp for processing a sealing pipe orifice error-proof boss of an engine pipe fitting. The pipe orifice clamping and positioning unit comprises a positioning block and a clamping block, wherein the clamping block can be parallel to or far away from the positioning block under the action of the power mechanism, so that the clamping of the pipe orifice part is realized. The positioning block is provided with a first U-shaped hole, and the first U-shaped hole is provided with a U-shaped groove matched with the upper end face and the outer peripheral face of the sealing pipe orifice of the engine pipe fitting, so that the pipe fitting is ensured to be positioned correctly. The U-shaped groove is rectangular in radial cross section, a second U-shaped hole is formed in the clamping block, a U-shaped inclined surface matched with the lower inclined surface of the sealing pipe orifice of the engine pipe fitting is arranged on the second U-shaped hole, and the U-shaped groove and the U-shaped inclined surface are matched and clamped on the sealing pipe orifice of the engine pipe fitting. The invention ensures the stability and the positioning accuracy of the processing clamp and well ensures the processing quality of the error-proof boss.
Description
Technical Field
The invention discloses a clamp for machining a sealing pipe orifice of an engine pipe fitting, belongs to the technical field of machining and manufacturing of sealing pipe orifices of engine pipe fittings, and particularly discloses a clamp for machining an error-proof boss of the sealing pipe orifice of the engine pipe fitting.
Background
At present, more than ten pipe parts are arranged on an automobile engine, in order to ensure the correct positions of two pipe orifices in assembly, the design of a product adopts a mode of adding an error-proof boss on a sealed pipe orifice at present, and the mode of casting an arrow on a pipe body to represent the assembly position in the prior art is gradually canceled. Therefore, the lug boss is embedded into the part assembled in a matching way during assembly, and the purpose of error prevention is truly achieved. But the problem brought is that the processing manufacturability of the error-proof boss of the sealing pipe orifice is not good, and the quality of the error-proof boss processed on processing center equipment is not easy to guarantee. Previous tooling fixture solutions have generally used the outside diameter of the sealing nozzle as the primary location. However, the outer diameter length of the pipe orifice is shorter, 4-5mm, the positioning reliability is poor, and the conditions of part clamping deformation, part torsion dislocation and the like often occur in the processing process, so that the process capability CPK (process capability index) is lower than 1.0.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides the fixture for processing the error-proof boss of the sealing pipe orifice of the engine pipe fitting, which ensures the stability and the positioning accuracy of the processing fixture and well ensures the processing quality of the error-proof boss.
The invention discloses a clamp for processing a sealing pipe orifice error-proof boss of an engine pipe fitting, which is used for clamping and positioning the sealing pipe orifice part of the engine pipe fitting, wherein the projection shape of the sealing pipe orifice part of the engine pipe fitting along a pipe orifice central axis is circular, the radial cross section shape of the sealing pipe orifice part of the engine pipe fitting is rectangular trapezoid, the clamp comprises a pipe orifice clamping unit for clamping and positioning the sealing pipe orifice part of the engine pipe fitting and a pipe body positioning unit for positioning a pipe body, the pipe orifice clamping unit comprises a positioning block and a clamping block, the positioning block and the clamping block can be parallel close to or far away from each other under the action of a power mechanism, a first U-shaped hole is arranged on the positioning block, a U-shaped groove matched with the upper end face and the peripheral face of the sealing pipe orifice part of the engine pipe fitting is arranged on the first U-shaped hole, the cross section shape of the U-shaped groove along the radial direction is rectangular, a second U-shaped hole is arranged on the clamping block, a U-shaped inclined surface matched with the lower inclined surface of the sealing pipe orifice part of the engine pipe fitting is arranged on the second U-shaped hole, and the U-shaped inclined surface is matched with the lower inclined surface of the sealing pipe orifice part of the engine pipe fitting is clamped.
In a preferred embodiment of the invention, the depth of the U-shaped groove along the axial direction of the sealing orifice of the engine pipe fitting is smaller than the width of the peripheral surface of the sealing orifice of the engine pipe fitting, so that the clamping block can clamp a workpiece conveniently.
In a preferred embodiment of the invention, the power mechanism comprises a linear cylinder and a guide rod guide sleeve mechanism, wherein the linear cylinder is arranged in parallel with the guide rod guide sleeve mechanism, and the axis of the guide rod guide sleeve mechanism is arranged perpendicular to the positioning block and the clamping block.
In a preferred embodiment of the present invention, the linear cylinder comprises two, the guide rod guide sleeve mechanism comprises two, the two linear cylinders are symmetrically arranged, and the two guide rod guide sleeve mechanisms are symmetrically arranged.
In a preferred embodiment of the invention, the device comprises a base, wherein the base is fixedly connected with the positioning block, and the lower part of the positioning block is connected with the clamping block in parallel through the power mechanism.
In a preferred embodiment of the present invention, the pipe body positioning unit includes a supporting block and a positioning block, the supporting block is disposed below the first U-shaped hole, and the positioning block is disposed beside the supporting block.
In a preferred embodiment of the invention, the supporting block is L-shaped, and a supporting inclined plane matched with the sealing pipe orifice of the engine pipe fitting is arranged on the upper end surface of the L-shaped supporting block.
The beneficial effects of the invention are as follows: the utility model has the advantages of simple structure and accurate positioning, and stable working procedure capability (CPK is more than or equal to 1.33), and the positioning of the spigot surface of the sealing pipe orifice part of the engine pipe fitting is utilized, so that the stability and the positioning accuracy of the processing clamp are ensured, and the processing quality of the error-proof boss is well ensured; furthermore, the invention adopts two short-range air cylinders to clamp at the same time, thereby greatly improving the efficiency of part processing and the stability of clamping; furthermore, the invention prevents the rotation of the engine pipe fitting sealing pipe in the process of processing the error-proof boss through the arrangement of the pipe body positioning unit.
Drawings
FIG. 1 is a schematic view of an engine fitting sealing tube of a fixture for an engine fitting machining sealing tube orifice error proofing boss of the present invention;
FIG. 2 is a front view of an engine fitting sealing tube of the present invention for use in a fixture for an engine fitting machining sealing tube orifice error proofing boss;
FIG. 3 is a schematic view of the sealing nozzle portion of an engine fitting of the present invention for use with a fixture for machining a sealing nozzle error proofing boss of the engine fitting;
FIG. 4 is a cross-sectional view of the sealing nozzle portion of the engine fitting of the present invention for the fixture of the engine fitting machining sealing nozzle error proofing boss;
FIG. 5 is a front view of the sealing nozzle portion of the engine fitting of the present invention for the fixture of the engine fitting machining sealing nozzle error proofing boss;
FIG. 6 is a schematic illustration of a fixture for machining a sealing nozzle error proofing boss for an engine pipe fitting according to the present invention;
FIG. 7 is a front view of a fixture for machining a sealing nozzle error proofing boss for an engine pipe fitting of the present invention;
FIG. 8 is a side view of a fixture for machining a sealing nozzle error proofing boss for an engine pipe fitting of the present invention;
FIG. 9 is a partial view of a fixture for machining a sealing nozzle error proofing boss for an engine pipe fitting of the present invention;
FIG. 10 is a schematic view of a clamping state of a clamp for machining a sealing nozzle error-proofing boss of an engine pipe fitting;
in the figure: 1-positioning blocks; 2-clamping blocks; 3-a power mechanism; 4-sealing the pipe orifice of the engine pipe fitting; 5-a base; 6-supporting blocks; 7-positioning blocks; 11-a first U-shaped aperture; 12-U-shaped grooves; 21-a second U-shaped aperture; 22-U-shaped inclined planes; 31-a linear cylinder; 32-a guide rod guide sleeve mechanism; 41-error-proofing bosses; 42-upper end face; 43-an outer peripheral surface; 44-lower inclined plane; 61-support ramp.
Description of the embodiments
The following describes the invention in further detail, including preferred embodiments, by way of the accompanying drawings and by way of examples of some alternative embodiments of the invention. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
In the description of the present application, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of description of the present application and simplification of the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present application. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
Further, in this application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The invention discloses a clamp for machining a sealing pipe orifice error-proof boss of an engine pipe fitting, which is used for clamping and positioning the sealing pipe orifice part 4 of the engine pipe fitting, wherein a positioning reference comprises a main positioning surface A (a spigot of the sealing pipe orifice part 4 of the engine pipe fitting), a first auxiliary positioning surface B (an outer circle of the sealing pipe orifice part 4 of the engine pipe fitting) and a second auxiliary positioning surface (an outer wall of a pipe body), the projection shape of the sealing pipe orifice part 4 of the engine pipe fitting along a pipe orifice central axis is a circular ring shape, the radial cross section shape of the sealing pipe orifice part 4 of the engine pipe fitting is a right trapezoid, the clamp comprises a pipe orifice clamping unit for clamping and positioning the sealing pipe orifice part 4 of the engine pipe fitting and a pipe body positioning unit for positioning a pipe body, the pipe orifice clamping unit comprises a positioning block 1 and a clamping block 2, the positioning block 1 and the clamping block 2 can be parallel close to or far away from each other under the action of a power mechanism 3, a first U-shaped hole 11 is arranged on the positioning block 1, a U-shaped groove 12 for being matched with an upper end face 42 and an outer peripheral face 43 of the sealing pipe orifice part 4 of the engine pipe fitting, the U-shaped hole 12 is arranged on the first U-shaped hole 11, the U-shaped hole is a rectangle in the radial cross section shape along the radial cross section of the U-shaped groove is the radial cross section shape, the clamping block 21 is a rectangular, the second U-shaped hole 21 is used for clamping the U-shaped hole 21 is matched with the U-shaped groove, and the U-shaped groove is matched with the U-shaped groove 4 and the bevel face of the sealing pipe orifice part 4 is matched with the sealing pipe orifice 4 under the bevel 4 and the sealing pipe orifice 4.
Preferably, the depth of the U-shaped groove 12 along the axial direction of the engine pipe fitting sealing pipe orifice is smaller than the width of the outer peripheral surface of the engine pipe fitting sealing pipe orifice part 4, so that interference can be avoided, clamping action can be ensured, the U-shaped inclined surface 22 and the lower inclined surface 44 can not be contacted, and inclined surface fitting can be realized.
Preferably, the power mechanism 3 comprises a linear cylinder 31 and a guide rod guide sleeve mechanism 32, the linear cylinder 31 and the guide rod guide sleeve mechanism 32 are arranged in parallel, the axis of the guide rod guide sleeve mechanism 32 is arranged perpendicular to the positioning block 1 and the clamping block 2, the linear cylinder 31 and the guide rod guide sleeve mechanism 32 are both arranged along the Z axial direction, the cylinder body end of the linear cylinder 31 is fixedly connected with the base 5, the piston rod end of the linear cylinder 31 is fixedly connected with the clamping block 2, the guide sleeve of the guide rod guide sleeve mechanism 32 is fixedly connected with the positioning block 1, the positioning block 1 is fixedly connected with the base 5, the guide rod of the guide rod guide sleeve mechanism 32 is fixedly connected with the clamping block 2, and the clamping block 2 can be parallel close to the positioning block 1 or far away from the positioning block 1 under the pushing of the linear cylinder 31 and the guide of the guide rod guide sleeve mechanism 32.
Preferably, the linear cylinder 31 includes two, the guide bar guide sleeve mechanisms 32 include two, the two linear cylinders 31 are symmetrically arranged with respect to the YOZ plane, and the two guide bar guide sleeve mechanisms 32 are symmetrically arranged with respect to the YOZ plane.
Preferably, the clamping device comprises a base 5, wherein a positioning block 1 is fixedly connected to the base 5, and a clamping block 2 is connected in parallel below the positioning block 1 through a power mechanism 3.
Preferably, the pipe body positioning unit comprises a supporting block 6 and a positioning block 7, wherein the supporting block 6 is arranged below the first U-shaped hole 11, and the positioning block 7 is arranged beside the supporting block 6 (arranged forwards and backwards along Y).
Preferably, the support block 6 is L-shaped, and a support inclined surface 61 matched with the sealing pipe orifice portion 4 of the engine pipe fitting is arranged on the upper end surface of the L-shaped support block 6.
The invention optimizes the clamp structure of the error-proof boss of the sealing pipe orifice of the engine pipe fitting processing, and solves the problem of unstable clamp in the original processing process. The processing quality and efficiency of the sealing pipe orifice of the engine pipe fitting are greatly improved;
1. the invention changes the positioning mode of the error-proof boss of the sealing pipe orifice part 4 of the engine pipe fitting processing, takes the spigot surface of the sealing pipe orifice as a main positioning surface, and replaces the traditional method of taking the outer diameter of the sealing pipe orifice as a positioning surface. Specific: the pipe mouth spigot positioning limits 3 degrees of freedom (Z-direction movement and X, Y rotation) of the workpiece, the lateral outer diameter limits 2 degrees of freedom (X, Y movement in two directions) of the workpiece, and the far pipe wall limits 1 degree of freedom (Z-direction rotation) of the workpiece.
2. In order to ensure effective fit between the spigot surface of the part and the positioning surface of the clamp, the clamp is designed to be guided by a guide post.
3. And the air cylinder is adopted to push the clamping block upwards to clamp the part.
The invention provides a better solution for processing error-proof bosses of all engine pipe fittings, and the processing quality and the production efficiency of the engine pipe fitting sealing pipe are greatly improved.
It will be readily understood by those skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention and that various modifications, combinations, substitutions, improvements, etc. may be made without departing from the spirit and principles of the invention.
Claims (5)
1. A anchor clamps that is used for sealed mouth of pipe mistake proofing boss of engine pipe fitting processing, its characterized in that: the positioning reference comprises a main positioning surface (A), a first auxiliary positioning surface (B) and a second auxiliary positioning surface, wherein the main positioning surface (A) is a spigot of the engine pipe fitting sealing pipe opening part (4), the first auxiliary positioning surface (B) is an outer circle of the engine pipe fitting sealing pipe opening part (4), the second auxiliary positioning surface is a pipe body outer wall, the spigot of the engine pipe fitting sealing pipe opening part (4) is positioned to limit the Z-direction movement of a workpiece and X, Y to rotate in two directions, the outer circle of the engine pipe fitting sealing pipe opening part (4) is positioned to limit the X, Y-direction movement of the workpiece, the pipe body outer wall is positioned to limit the Z-direction rotation of the workpiece, the projection of the engine pipe fitting sealing pipe opening part (4) along a central axis is circular, the cross section of the engine pipe fitting sealing pipe opening part (4) along the radial direction is in a right trapezoid shape, the clamp comprises a base (5), a pipe opening clamping unit for clamping and a pipe body positioning unit for positioning a pipe body, the pipe opening clamping unit comprises a first positioning block (1) and a second positioning block (2), the pipe body clamping unit is fixedly connected with the base (1) in parallel to the first positioning block (1), the clamping device comprises a first positioning block (1) and a clamping block (2), wherein the first positioning block (1) and the clamping block (2) can be parallel to or far away from each other under the action of a power mechanism (3), a first U-shaped hole (11) is formed in the first positioning block (1), a U-shaped groove (12) matched with the upper end face and the outer peripheral face of a sealing pipe orifice part (4) of an engine pipe fitting is formed in the first U-shaped hole (11), the cross section of the U-shaped groove in the radial direction is rectangular, a second U-shaped hole (21) is formed in the clamping block (2), a U-shaped inclined surface (22) matched with the lower inclined surface of the sealing pipe orifice part (4) of the engine pipe fitting is formed in the second U-shaped hole (21), and the U-shaped groove (12) and the U-shaped inclined surface (22) are matched to clamp the sealing pipe orifice part (4) of the engine pipe fitting; the pipe body positioning unit comprises a supporting block (6) and a second positioning block (7), wherein the supporting block (6) is arranged below the first U-shaped hole (11), and the second positioning block (7) is arranged beside the supporting block (6).
2. The fixture for machining sealing nozzle error-proofing bosses of engine pipe fitting according to claim 1, wherein: the depth of the U-shaped groove (12) along the axial direction of the sealing pipe orifice of the engine pipe fitting is smaller than the width of the outer peripheral surface of the sealing pipe orifice part (4) of the engine pipe fitting, so that the clamping block (2) can conveniently realize clamping action.
3. The fixture for machining sealing nozzle error-proofing bosses of engine pipe fitting according to claim 1, wherein: the power mechanism (3) comprises a linear air cylinder (31) and a guide rod guide sleeve mechanism (32), wherein the linear air cylinder (31) and the guide rod guide sleeve mechanism (32) are arranged in parallel, and the axis of the guide rod guide sleeve mechanism (32) is perpendicular to the first positioning block (1) and the clamping block (2).
4. A fixture for machining sealing nozzle error-proofing bosses of engine pipe fitting according to claim 3, wherein: the linear air cylinders (31) comprise two, the guide rod guide sleeve mechanisms (32) comprise two, the two linear air cylinders (31) are symmetrically arranged, and the two guide rod guide sleeve mechanisms (32) are symmetrically arranged.
5. The fixture for machining sealing nozzle error-proofing bosses of engine pipe fitting according to claim 1, wherein: the supporting block (6) is L-shaped, and a supporting inclined plane (61) matched with the sealing pipe orifice part (4) of the engine pipe fitting is arranged on the upper end surface of the L-shaped supporting block (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111002552.2A CN113787329B (en) | 2021-08-30 | 2021-08-30 | Clamp for processing sealing pipe orifice error-proof boss of engine pipe fitting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111002552.2A CN113787329B (en) | 2021-08-30 | 2021-08-30 | Clamp for processing sealing pipe orifice error-proof boss of engine pipe fitting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113787329A CN113787329A (en) | 2021-12-14 |
| CN113787329B true CN113787329B (en) | 2024-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111002552.2A Active CN113787329B (en) | 2021-08-30 | 2021-08-30 | Clamp for processing sealing pipe orifice error-proof boss of engine pipe fitting |
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| Country | Link |
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| CN (1) | CN113787329B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11241791A (en) * | 1997-12-25 | 1999-09-07 | World Kogyo Kk | Adjusting metal fitting |
| CN204397403U (en) * | 2015-01-29 | 2015-06-17 | 格朗富（苏州）集团有限公司 | A kind of clamp for machining of elbow' upper flange |
| CN105773518A (en) * | 2016-04-19 | 2016-07-20 | 江西江铃底盘股份有限公司 | Press-fitting system and method for main speed reducer shell and flange head |
| CN107186505A (en) * | 2017-06-18 | 2017-09-22 | 禹州市灵龙渔机泵业有限公司 | A kind of floating support device |
| CN208514127U (en) * | 2018-05-09 | 2019-02-19 | 安徽机电职业技术学院 | The Special milling machine clamp of pneumatic pinch |
| CN210649631U (en) * | 2019-10-15 | 2020-06-02 | 江阴市同方机械配件制造有限公司 | Fixing device for processing exhaust elbow of diesel engine |
-
2021
- 2021-08-30 CN CN202111002552.2A patent/CN113787329B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11241791A (en) * | 1997-12-25 | 1999-09-07 | World Kogyo Kk | Adjusting metal fitting |
| CN204397403U (en) * | 2015-01-29 | 2015-06-17 | 格朗富（苏州）集团有限公司 | A kind of clamp for machining of elbow' upper flange |
| CN105773518A (en) * | 2016-04-19 | 2016-07-20 | 江西江铃底盘股份有限公司 | Press-fitting system and method for main speed reducer shell and flange head |
| CN107186505A (en) * | 2017-06-18 | 2017-09-22 | 禹州市灵龙渔机泵业有限公司 | A kind of floating support device |
| CN208514127U (en) * | 2018-05-09 | 2019-02-19 | 安徽机电职业技术学院 | The Special milling machine clamp of pneumatic pinch |
| CN210649631U (en) * | 2019-10-15 | 2020-06-02 | 江阴市同方机械配件制造有限公司 | Fixing device for processing exhaust elbow of diesel engine |
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| Publication number | Publication date |
|---|---|
| CN113787329A (en) | 2021-12-14 |
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