CN117564221A - Sand core positioning tool, sand core combining method and aeroengine - Google Patents
Sand core positioning tool, sand core combining method and aeroengine Download PDFInfo
- Publication number
- CN117564221A CN117564221A CN202311610993.XA CN202311610993A CN117564221A CN 117564221 A CN117564221 A CN 117564221A CN 202311610993 A CN202311610993 A CN 202311610993A CN 117564221 A CN117564221 A CN 117564221A
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- Prior art keywords
- sand
- positioning
- core
- sleeve member
- sand core
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000003110 molding sand Substances 0.000 claims abstract description 29
- 244000035744 Hura crepitans Species 0.000 claims abstract description 27
- 230000008569 process Effects 0.000 claims abstract description 11
- 230000000149 penetrating effect Effects 0.000 claims abstract description 6
- 239000004576 sand Substances 0.000 claims description 103
- 238000005266 casting Methods 0.000 claims description 15
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000000465 moulding Methods 0.000 claims description 5
- 238000007493 shaping process Methods 0.000 claims description 5
- 230000008439 repair process Effects 0.000 claims description 3
- 238000005299 abrasion Methods 0.000 abstract description 2
- 230000006872 improvement Effects 0.000 description 8
- 238000007528 sand casting Methods 0.000 description 3
- 238000003754 machining Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910000861 Mg alloy Inorganic materials 0.000 description 1
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C21/00—Flasks; Accessories therefor
- B22C21/10—Guiding equipment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
- B22C7/06—Core boxes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
- B22C9/103—Multipart cores
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention discloses a sand core positioning tool, a sand core combination method and an aeroengine, wherein the sand core positioning tool comprises the following components: the top and bottom openings of the sand box are arranged; the template is used for being arranged at one end of the opening of the sand box and used for enabling the sand core to be positioned at one end of the template to form a positioning structure after molding sand is filled in the sand box; the locating pin is vertically arranged at a preset position on the template; the sleeve member is sleeved on the positioning pin so as to be embedded in the sand core after molding sand is filled in the sand box; and the combined positioning piece is used for penetrating into the sleeve member of each sand core when the sand cores are combined. The sand core positioning tool enables the molding sand to be embedded with the sleeve member through the positioning pin positioning sleeve member, and the sleeve member and the combined positioning piece are utilized to position in the sand core combining process, so that the problems of high combination error and the like caused by easy abrasion and large gap of the molding sand in the combining process are effectively avoided.
Description
Technical Field
The invention relates to the technical field of aero-engine castings, in particular to a sand core positioning tool, a sand core combining method and an aero-engine.
Background
According to HB6103 requirement, the casting tolerance recommended grade of the sand casting piece of aluminum magnesium alloy is basically CT 9-CT 11, which belongs to the casting method with the most relaxed size requirement in all casting methods, but with the higher and higher integration function of aeroengine design, the size of the casting piece is bigger and bigger, the size precision is higher, and the higher requirement is put forward on the size precision of the sand casting piece.
The aircraft engine foundry goods product kind is many, and automated production degree of difficulty is big, relies on the manual work to carry out the combination of sand core greatly, and factor that influences product quality increases, traditional sand mould locate mode, as shown in fig. 1, generally set up the technology hole and adopt indent and evagination integrated configuration to fix a position, and all location structures are by resin sand to constitute, have the clearance big, easy wearing and tearing scheduling problem, influence foundry goods dimensional accuracy, and the bigger the foundry goods, the bigger corresponding sand mould, core size, the bigger the foundry goods size produces the possibility of deviation in the sand core combination process.
Disclosure of Invention
The invention provides a sand core positioning tool, a sand core combination method and an aeroengine, which are used for solving the technical problem that the dimensional accuracy of a casting is low due to the fact that the positioning accuracy of the existing middle-size and large-size sand castings is low.
The technical scheme adopted by the invention is as follows:
a sand core positioning tooling, comprising:
the sand box is used for filling molding sand to prepare a sand mold;
the template is used for being matched with the sand box and used for enabling the sand box to be positioned at one end of the template to form a positioning structure after molding sand is filled in the sand box;
the core box is used for filling molding sand to manufacture a sand core;
the locating pin is arranged at a preset position on the template along the demolding direction and/or at a preset position on the core box along the demolding direction;
the sleeve member is sleeved on the positioning pin so as to fill molding sand into the sand box and then is embedded into the sand box;
and the combined positioning piece is used for penetrating into each sleeve member when the sand molds and/or the sand cores are combined.
As a further improvement of the above technical solution, the shaping plate is provided with a hole structure or a protruding structure so that the end face of the manufactured sand mold facing one side of the shaping plate forms a positioning structure.
As a further improvement of the technical scheme, the positioning structure is a positioning core head and/or a positioning groove formed on the end face of the sand mold.
As a further improvement of the above technical solution, the positioning structure includes at least one positioning core head formed in the middle of the end face of the sand mold or at least one positioning groove formed in the middle of the end face of the sand mold, and the sleeve member is disposed in the middle of the positioning structure.
As a further improvement of the technical scheme, the outer wall of the sleeve member is convexly provided with a limiting structure for increasing the axial contact area with the sand mold so as to axially position the sleeve member in the sand mold.
As a further improvement of the technical scheme, the height of the sleeve member is matched with the height of the sand mold, and the height of the locating pin is larger than or equal to the height of the sleeve member.
As a further improvement of the above technical solution, the height of the combined positioning member is matched with the sum of the heights of the sleeve members embedded in the sand mold to be combined.
As a further improvement of the technical scheme, the sand core positioning tool further comprises a process plugging piece, wherein the process plugging piece is used for plugging each hole of the casting produced by the sand core positioning tool so as to reduce repair welding area.
According to another aspect of the present invention, there is also provided a sand core combining method, to which any one of the above sand core positioning tools is applied, the combining method including the steps of:
s1, matching the layout positions of positioning pins according to the structure of a target sand core, and preparing or manufacturing a template and a core box;
s2, installing positioning pins at preset positions on the template and the core box;
s3, arranging the sand box on the template, sleeving sleeve members on the positioning pins respectively, and filling sand for molding and core making;
s4, respectively taking out the sand mould and the sand core, placing the sand mould on a working plane, and inserting the combined positioning piece into a sleeve member positioned in the sand mould;
s5, combining the upper sand mold and/or the sand core with the sand mold arranged on the working plane, and enabling the combined positioning piece to penetrate through the sleeve member of the upper sand mold and/or the sand core until the sand core combination is completed.
According to another aspect of the invention, there is also provided an aeroengine, employing the sand core assembly method described above.
The invention has the following beneficial effects:
the sand core positioning tool is mainly suitable for positioning and combining middle-sized and large-sized sand core castings, a sleeve member is sleeved on a positioning pin at a preset position on a template after a sand box is connected with the template, molding sand is filled into the sand box, the sand mold can be obtained after curing and demolding of the molding sand, the positioning pin is removed from the template, the sleeve member is sleeved on the positioning pin of a core box to be filled with molding sand, the sand core of an inner nested cylinder member can be obtained after curing the molding sand, when the sand core is combined, the sand mold is placed on a working plane, a combined positioning piece is penetrated into the sleeve member of the sand mold of the working plane, the upper sand mold and/or the sand core are moved to be combined with the sand mold of the working plane, then the combined positioning piece is sequentially penetrated into each sleeve member to complete sand core combination, and the positioning pin is used for main positioning support, and the traditional sand core positioning mode is used as auxiliary support to realize accurate positioning of the sand mold combination; this sand core location frock makes the embedded sleeve member that establishes of sand core through locating pin location sleeve member, utilizes sleeve member and combination setting element to fix a position in sand mould combination in-process, utilizes locating pin and sleeve member machining's clearance or transition fit tolerance to carry out the accurate positioning to the combination between the sand mould promptly, and former location structure as main locate mode only is as auxiliary positioning support, effectively avoids the molding sand easily wearing and tearing in the combination in-process, the big scheduling problem of combination error that causes in clearance, improves the positioning accuracy between the sand mould by a wide margin, and then improves foundry goods dimensional accuracy by a wide margin.
In addition to the objects, features and advantages described above, the present invention has other objects, features and advantages. The invention will be described in further detail with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a schematic diagram of a prior art sand core positioning;
FIG. 2 is a schematic structural view of a positioning structure of a sand core according to a preferred embodiment of the present invention;
FIG. 3 is a schematic illustration of a sand core assembly according to a preferred embodiment of the present invention;
FIG. 4 is a schematic view of the sleeve member structure of the preferred embodiment of the present invention;
FIG. 5 is a schematic view of the construction of a composite positioning element according to a preferred embodiment of the present invention;
FIG. 6 is a schematic illustration of the assembly of a pattern plate and flask in accordance with a preferred embodiment of the invention;
FIG. 7 is a schematic view of the sleeve member and dowel assembly of a preferred embodiment of the present invention;
1. sand box 2, template 3, locating pin 4, sleeve member 41, limit structure 5, combination setting element 6, sand mould 61, location structure.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
Referring to fig. 1 to 7, a preferred embodiment of the present invention provides a sand core positioning tool, comprising:
a sand box 1 for filling molding sand to make a sand mold;
the template 2 is used for being matched with the sand box 1, and is used for forming a positioning structure by arranging the sand mould 6 at one end of the template 2 after filling molding sand into the sand box 1;
the core box is used for filling molding sand to manufacture a sand core;
the locating pin 3 is arranged at a preset position on the template 2 along the demoulding direction and/or at a preset position on the core box along the demoulding direction;
the sleeve member 4 is sleeved on the positioning pin 3 to fill molding sand into the sand box 1 and then is embedded into the sand mould 6;
and the combined positioning piece 5 is used for penetrating and arranging the sleeve members 4 when the sand molds and/or the sand cores are combined.
It can be understood that the sand core is divided into a sand mold and a sand core, the sand core positioning fixture is mainly suitable for positioning and combining a medium-sized and large-sized sand core casting, a sleeve member 4 is sleeved on a positioning pin 3 at a preset position on a template 2 after a sand box 1 is connected with the template 2, molding sand is filled into the sand box 1, the sand mold can be obtained after curing and demolding of the molding sand, the template 2 is removed, the positioning pin 3 is removed at the same time, the sleeve member 4 is embedded in the sand mold 6, the positioning pin of the core box is sleeved with the molding sand, the molding sand can be filled with the sand core of an inner nested cylinder member after curing the molding sand, when the sand core is combined, the sand mold 6 is placed on a working plane, a combined positioning piece 5 is arranged in the sleeve member 4 of the sand mold 6 of the working plane in a penetrating manner, the upper sand mold 6 and/or the sand core of the working plane are/is combined, and then the combined positioning piece 5 is sequentially arranged in the sleeve members 4 in a penetrating manner, core combination is completed, and the main positioning support is carried out by the positioning pin, and the conventional positioning mode is used as auxiliary support, so that accurate positioning of the combination of the sand mold 6 is realized; this sand core location frock makes the embedded sleeve component 4 of sand core through locating pin 3 location sleeve component 4, utilize sleeve component 4 and combination setting element 5 to carry out the location at sand mould 6 combination in-process, utilize locating pin 3 and sleeve component 4 machining's clearance or transition fit tolerance to carry out the accurate positioning to the combination between the sand mould 6 promptly, former location structure as main locate mode only is as auxiliary positioning support, the easy wearing and tearing of molding sand in the combination in-process, the big scheduling problem of combination error that the clearance leads to is big is effectively avoided, improve the positioning accuracy between the sand mould 6 by a wide margin, and then improve foundry goods dimensional accuracy by a wide margin.
The drawings of the embodiment show that the combination of two sand molds 6 is taken as an example;
the positioning pins 3 are fixedly arranged on the template of the embodiment, and the sand cores are selectively arranged according to the actual structure and the requirements;
wherein, the sand mold 6 forms a positioning structure based on a process hole structure or a protruding structure on the template 2, and the end surface of the sand mold 6 facing one side of the template 2 is used as an auxiliary support;
in this embodiment, the outer wall of the sleeve member 4 is convexly provided with a limiting structure 41 for increasing the axial contact area with the sand mold 6 so as to axially position the sleeve member 4 in the sand mold 6, and it should be understood that the limiting structure 41 may be disposed at one or more positions on the sleeve member 4, and the outer diameter of the sleeve member 4, the outer diameter of the limiting structure 41 and the height are all set in a matching manner according to the size of the mold and the size of the positioning structure.
In this embodiment, the height of the sleeve member 4 is matched with the height of the sand mold 6, the height of the positioning pin 3 is greater than or equal to the height of the sleeve member 4, namely, after the sleeve member 4 is embedded in the sand mold 6, the end face of the positioning pin is flush with the end face of the sand mold 6, so that the combined positioning of the sand mold 6 is facilitated, the height of the positioning pin 3 is greater than or equal to the height of the sleeve member 4, molding sand is prevented from falling into the sleeve member 4, the height of the positioning pin 3 is preferably matched with the height of the sleeve member 4, namely, when the sleeve member 4 is sleeved, whether the sleeve member 4 is installed in place or not can be judged according to the distance difference between the end face of the sleeve member 4 and the end part of the positioning pin 3, and the position accuracy of the sleeve member 4 embedded in the sand mold 6 after molding sand is filled is ensured;
further, the height of the combined locating piece 5 is matched with the sum of the heights of the sleeve members 4 embedded in the sand mold 6 to be combined, namely, the sum of the heights of the sleeve members 4 of the upper sand mold 6 and the sleeve members 4 of the lower sand mold 6 is the same as the height of the combined locating piece 5, when the upper sand mold 6 and the lower sand mold 6 are combined, whether the combined locating piece 5 is in place or not can be judged by observing the distance difference between the combined locating piece 5 and the end part of the sleeve member 4 above the upper sand mold 6, and when the end part of the combined locating piece 5 is level with the end part of the sleeve member 4, namely, the sand mold 6 is combined in place, so that the operation is more convenient, the manual operation strength and the operation difficulty are greatly reduced, and the efficiency is improved.
In this embodiment, the positioning structure is a positioning core and/or a positioning groove formed on an end face of the sand mold 6, for example, when the end face of the upper sand mold 6 forms the positioning core, the end face of the lower sand mold 6 forms a positioning groove matched with the positioning core at a corresponding position;
the positioning structure comprises at least one positioning core head formed in the middle of the end face of the sand mold 6 or at least one positioning groove formed in the middle of the end face of the sand mold 6, and the sleeve member 4 is arranged in the middle of the positioning structure, so that the positioning pin 3 and the sleeve member 4 are preferably arranged in the middle position, namely in the axle center of the casting under the condition that the structure allows, so as to ensure the positioning precision, the positioning effect and the comprehensive dimensional precision of the produced casting; in other embodiments, the position and the size of the positioning pin 3 are adaptively set according to the shape, the wall thickness and the like of the casting;
specifically, the positioning structure further comprises a plurality of positioning core heads which are uniformly distributed on the circumferential direction of the end face of the sand mold 6, the size of each positioning core head is smaller than that of the positioning core head at the middle part, and the positioning structure can perform auxiliary positioning;
furthermore, the positioning core head at the middle part of the embodiment is in a truncated cone shape, the outer wall of the positioning core head has a certain taper, and the shape of the positioning groove is matched with the positioning core head, so that the positioning core head and the positioning groove are attached when the sand cores are completely combined, and abrasion of the sand mould 6 caused by interference and friction is avoided;
in this embodiment, because the process Kong Pianda on the cast finally is performed by using the positioning tool to perform positioning, the sand core positioning tool further comprises a process plugging piece, and the special process plugging piece is used for plugging the process hole on the produced cast, so that the wall thickness of the cast can be ensured while the repair welding area is reduced.
On the other hand, the embodiment also provides a sand core combination method, which is applied to the sand core positioning tool and comprises the following steps:
s1, matching the layout positions of the positioning structure and the layout positions of the positioning pins 3 according to the structure of the target sand mold 6, and preparing or manufacturing the template 2;
the combined positioning piece 5 is a combined pin, and the outer diameter of the positioning pin 3, the outer diameter of the combined pin and the inner diameter of the sleeve member 4 are matched; the outer diameter of the sleeve member 4 and the outer diameter of the limiting structure 41 thereof are matched according to the casting mould size and the like, interference is avoided, and the height of the combined pin is matched with the sum of the heights of the two sleeve members 4;
s2, installing a positioning pin 3 at a preset position on the template 2 and the core box;
s3, arranging the sand box 1 on the template 2, sleeving sleeve members 4 on each positioning pin 3, filling sand, modeling and filling sand for core making;
before molding, the sand box 1 is sleeved on the template 2 and connected with the template 2, the sleeve member 4 is sleeved on the positioning pin until the sleeve member contacts with the template 2, then sand is filled for molding, and similarly, the sleeve member 4 is sleeved on the positioning pin of the core box for sand filling and core molding; it should be understood that the two sand molds 6 of this embodiment use different shaping plates 2 respectively;
s4, respectively taking out the sand mould 6 and the sand core, placing the sand mould 6 on a working plane, and inserting the combined positioning piece 5 into the sleeve member 4 of the sand mould 6 positioned on the working plane;
after the sand mold 6 is taken out, the sand mold 6 embedded with the sleeve member 4 is obtained, and the sand core is similar;
s5, combining the sand mould 6 and/or the sand core positioned at the upper position with the sand mould 6 positioned on the working plane, and enabling the combined pin to pass through the sleeve member 4 of the sand core positioned at the upper position until the sand mould 6 is combined.
The accurate positioning between the two sand molds 6 is realized through the combined pin, the relative position is accurate, the distance between the end face of the sleeve member 4 and the end face of the combined pin is observed from the upper side of the upper sand mold 6, if the two end faces are flush, the combined pin is in place, the operation is simple and convenient, the combination efficiency and the combination precision are improved, and the casting precision is improved.
On the other hand, the embodiment also provides an aeroengine, and the sand core combination method is applied.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. Sand core location frock, its characterized in that includes:
a sand box (1) for filling molding sand to make a sand mold;
the template (2) is used for being matched with the sand box (1) and enabling the sand mould (6) to be positioned at one end of the template (2) to form a positioning structure after molding sand is filled in the sand box (1);
the core box is used for filling molding sand to manufacture a sand core;
the locating pin (3) is arranged at a preset position on the template (2) along the demolding direction and/or at a preset position on the core box along the demolding direction;
the sleeve member (4) is sleeved on the positioning pin (3) so as to be embedded in the sand mould (6) after the sand box (1) is filled with molding sand;
and the combined positioning piece (5) is used for penetrating into each sleeve member (4) when the sand molds and/or the sand cores are combined.
2. A sand core positioning tool according to claim 1, characterized in that the shaping plate (2) is provided with a hole structure or a protruding structure to form a positioning structure for the end face of the manufactured sand mould (6) towards one side of the shaping plate (2).
3. A sand core positioning tool according to claim 2, characterized in that the positioning structure is a positioning core print and/or a positioning groove formed in the end face of the sand mould (6).
4. A sand core positioning tool according to claim 3, characterized in that the positioning structure comprises at least one positioning core head formed in the middle of the end face of the sand mould (6) or at least one positioning groove formed in the middle of the end face of the sand mould (6), and the sleeve member (4) is arranged in the middle of the positioning structure.
5. A sand core positioning tool according to claim 1, characterized in that the outer wall of the sleeve member (4) is convexly provided with a limiting structure (41) for increasing the axial contact area with the sand mould (6) so as to position the sleeve member (4) axially in the sand mould (6).
6. A sand core positioning tool according to claim 1, characterized in that the height of the sleeve member (4) matches the height of the sand mould (6), the height of the positioning pin (3) being greater than or equal to the height of the sleeve member (4).
7. A sand core positioning tool according to claim 6, characterized in that the height of the combined positioning element (5) matches the sum of the heights of the sleeve members (4) embedded in the sand mould (6) to be combined.
8. The sand core positioning tool of claim 1 further comprising a process plug for plugging each port of a casting produced by the sand core positioning tool to reduce repair weld area.
9. A sand core assembly method, wherein the sand core positioning tool of any one of claims 1-7 is applied, the assembly method comprising the steps of:
s1, matching the layout positions of positioning pins according to the structure of a target sand core, and preparing or manufacturing a template and a core box;
s2, installing positioning pins at preset positions on the template and the core box;
s3, arranging the sand box on the template, sleeving sleeve members on the positioning pins respectively, and filling sand for molding and core making;
s4, respectively taking out the sand mould and the sand core, placing the sand mould on a working plane, and inserting the combined positioning piece into a sleeve member positioned in the sand mould;
s5, combining the upper sand mold and/or sand core with the sand mold arranged on the working plane, and enabling the combined positioning piece 5 to penetrate through the sleeve member of the upper sand mold and/or the sand core until the sand core combination is completed.
10. An aircraft engine, characterized in that the sand core assembly method of claim 8 is applied.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311610993.XA CN117564221A (en) | 2023-11-29 | 2023-11-29 | Sand core positioning tool, sand core combining method and aeroengine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311610993.XA CN117564221A (en) | 2023-11-29 | 2023-11-29 | Sand core positioning tool, sand core combining method and aeroengine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117564221A true CN117564221A (en) | 2024-02-20 |
Family
ID=89886045
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311610993.XA Pending CN117564221A (en) | 2023-11-29 | 2023-11-29 | Sand core positioning tool, sand core combining method and aeroengine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117564221A (en) |
-
2023
- 2023-11-29 CN CN202311610993.XA patent/CN117564221A/en active Pending
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