CN115846454A - Method for forming middle pipe special for four-connecting rod - Google Patents
Method for forming middle pipe special for four-connecting rod Download PDFInfo
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- CN115846454A CN115846454A CN202211481268.2A CN202211481268A CN115846454A CN 115846454 A CN115846454 A CN 115846454A CN 202211481268 A CN202211481268 A CN 202211481268A CN 115846454 A CN115846454 A CN 115846454A
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Abstract
The invention relates to the technical field of bicycles, in particular to a method for forming a middle pipe special for a four-bar linkage; the method provided by the invention comprises the steps of melting a middle pipe raw material in a smelting furnace in a protective gas state to obtain casting liquid, pouring the ingot through an ingot mould to obtain an ingot, repeatedly beating the ingot, bending the ingot, pouring the casting liquid at the joint of a bent belt to obtain a pipe body, stamping the pipe body through an upper mould and a lower mould to obtain a primary middle pipe, coating a quenching agent on the surface of the primary middle pipe, wrapping the primary middle pipe with a tin foil, quenching the primary middle pipe in a quenching furnace, taking the tin foil down, performing water cooling in water, and repeating the quenching treatment and the water cooling to complete the forming of the middle pipe.
Description
Technical Field
The invention relates to the technical field of bicycles, in particular to a method for forming a middle pipe special for a four-bar linkage.
Background
Bicycles, also known as bicycles or bicycles, are typically two-wheeled small land vehicles. After a person rides the vehicle, the person steps on the pedal as power, and the vehicle is a green and environment-friendly vehicle. The bicycle is of various types, including single-person bicycles, double-person bicycles and multi-person bicycles. Can be used as an environment-friendly vehicle for riding instead of walking and going out; more and more people use bicycles as fitness equipment for riding exercise and bicycle travel; the bicycle itself is also a sport event, including road bike racing, mountain bike racing, field bike racing, stunt bike racing, and the like. With the development of science and technology, an electric bicycle is also a common vehicle.
The middle tube is an important component of the bicycle, generally refers to a tube in the middle of a bicycle frame, and a front derailleur is arranged on the middle tube, and the main function of the middle tube is to determine the specification and the size of the bicycle frame. Patent application No. CN202110639710.9, which describes in the specification, "by heating a steel strip and performing a plurality of rolling passes, cracks generated in the rolling pass of the steel strip of high carbon chromium bearing steel can be reduced to produce a tube blank; finally, the manufactured tube blank is welded to manufacture the steel tube, so that a large number of cracks which are easy to generate in the steel tube forming process are reduced; the steel pipe is prepared by adopting a comprehensive mode of continuous rolling and welding for multiple times, a large number of cracks generated in the steel pipe forming process of the high-carbon chromium bearing steel can be reduced in the steel pipe manufacturing and forming process of the thin-wall high-carbon chromium bearing steel, and the cracking generated in the using process of the steel pipe of the high-carbon chromium bearing steel is reduced.
In summary, the development of a method for forming a middle tube special for a four-bar linkage is a key problem which needs to be solved urgently in the technical field of bicycles.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the method for forming the middle pipe special for the four-bar linkage, the method is simple and convenient to operate, the effects of rigidity, hardness, wear resistance, fatigue strength, toughness and the like of the middle pipe are greatly improved, the service life and the performance of the middle pipe are prolonged, and the quality of the formed middle pipe is improved.
In order to realize the purpose, the invention provides the following technical scheme:
the invention provides a method for forming a middle pipe special for a four-bar linkage, which comprises the following steps:
(1) Taking a middle pipe raw material, and putting the middle pipe raw material into a smelting furnace for melting to obtain a casting liquid for later use;
(2) Taking an ingot mould, pouring the obtained pouring liquid into the ingot mould, and cooling to obtain an ingot;
(3) Repeatedly beating the ingot into a plate strip, bending the plate strip in a bending device to obtain a bent strip, pouring a casting liquid at the joint of the bent strip, and cooling to obtain a pipe body;
(4) Putting a core rod into the pipe body, then putting the pipe body into a lower die, and stamping the pipe body by using an upper die to obtain a primary middle pipe;
(5) And taking down the primary middle pipe, coating a quenching agent on the surface of the primary middle pipe, wrapping the primary middle pipe by using tin foil, quenching the primary middle pipe in a quenching furnace, taking down the tin foil, cooling the tin foil in water, and repeating the quenching treatment and the water cooling for 3-4 times to finish the forming of the middle pipe.
The invention is further provided with: in the step (1), when the middle pipe raw material is placed in a smelting furnace to be melted, protective gas needs to be introduced into the smelting furnace.
The invention is further provided with: the protective gas is any one of helium or argon.
The invention is further provided with: in the step (2), before the obtained casting liquid is poured into the ingot mold, a release agent is sprayed on the inner wall of the ingot mold, wherein the release agent is precoated sand.
The invention is further provided with: in the step (3), when the plate strip is placed in the bending device for bending, the plate strip is heated to be softened.
The invention is further provided with: in the step (4), the bent belt in the lower die is rotated once every 3-4 times of punching in the process of punching the bent belt by the upper die.
The invention is further provided with: in the step (5), the quenching agent is prepared from the following raw materials in parts by weight:
6-8 parts of 2-sodium acrylate homopolymer, 2-4 parts of ammonium acetate, 1-3 parts of sodium benzoate, 3-7 parts of triisopropyl phosphite, 2-4 parts of polyethylene wax, 1-3 parts of lauryl acetate and 20-40 parts of deionized water;
the preparation process of the quenching agent is as follows:
weighing deionized water, placing in a stirrer, adding 2-sodium acrylate homopolymer, ammonium acetate, triisopropyl phosphite and polyethylene wax into the stirrer, and mixing at 40-50 deg.C and rotation speed of 300-310r/min for 22-24min;
adding sodium benzoate and lauryl acetate into a stirrer, heating to 80 ℃ while stirring, and mixing for 10-12min under the condition of 820-840r/min to obtain a quenching agent;
wherein the temperature rise is carried out at a speed of 15-20 ℃/min.
The invention is further provided with: in the step (5), the quenching treatment temperature is 610-720 ℃, and the time is 20-30min.
The invention is further provided with: in the step (5), the water cooling time is 10-12min.
The invention is further provided with: in the step (5), after the quenching treatment and the water cooling are completed, the formed middle pipe is taken out, and the smooth formed middle pipe is polished by using 80-100-mesh abrasive cloth.
Advantageous effects
Compared with the known public technology, the technical scheme provided by the invention has the following advantages
Has the advantages that:
the method provided by the invention comprises the steps of melting a middle pipe raw material in a smelting furnace in a protective gas state to obtain casting liquid, pouring the ingot through an ingot mould to obtain an ingot, repeatedly beating the ingot, bending the ingot, pouring the casting liquid at the joint of a bent belt to obtain a pipe body, stamping the pipe body through an upper mould and a lower mould to obtain a primary middle pipe, coating a quenching agent on the surface of the primary middle pipe, wrapping the primary middle pipe with a tin foil, quenching the primary middle pipe in a quenching furnace, taking the tin foil down, performing water cooling in water, and repeating the quenching treatment and the water cooling to complete the forming of the middle pipe.
Drawings
Fig. 1 is a flow chart of a method for forming a middle tube special for a four-bar linkage according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present invention will be further described with reference to the following examples.
Example 1:
as shown in fig. 1, the invention provides a method for forming a middle tube special for a four-bar linkage, which comprises the following steps:
(1) Taking a middle pipe raw material, and putting the middle pipe raw material into a smelting furnace for melting to obtain a casting liquid for later use.
Furthermore, when the middle tube raw material is placed in a smelting furnace to be melted, protective gas needs to be introduced into the smelting furnace.
Further, the protective gas is helium.
In this embodiment, it should be noted that the raw material of the middle tube is placed in a melting furnace to be melted to obtain a casting liquid for casting, and the purity of the casting liquid is improved by the protective gas, so as to prevent the quality of the middle tube formed subsequently from being affected by the reaction between the casting liquid and other gases in the air during the melting process.
(2) And taking an ingot mould, pouring the obtained pouring liquid into the ingot mould, and cooling to obtain the ingot.
Furthermore, before the obtained casting liquid is poured into the ingot mold, a release agent is sprayed on the inner wall of the ingot mold, and the release agent is precoated sand.
In the embodiment, the cooled ingot can be conveniently separated from the ingot mold through the provided precoated sand.
(3) Repeatedly beating the ingot into a plate strip, then placing the plate strip in a bending device for bending to obtain a bent strip, pouring a pouring liquid at the joint of the bent strip, and cooling to obtain a pipe body.
Further, when the plate strip is placed in a bending device for bending, the plate strip is heated to be softened.
In the embodiment, the ingot is beaten into the plate strip repeatedly at first, and then is bent, and the gap at the bent joint is sealed to obtain the pipe body, so that the condition that the gap at the bent joint is not tightly sealed when the pipe body is subsequently stamped by an upper die and a lower die is avoided, and in addition, the plate strip is heated to be softened, so that the plate strip can be bent conveniently.
(4) And (3) putting a core rod into the pipe body, then putting the core rod into a lower die, and stamping the core rod by using an upper die to obtain the primary middle pipe.
Furthermore, in the process of punching the bent belt by the upper die, the bent belt in the lower die is rotated once every 4 times of punching.
In the embodiment, the center pipe of the middle pipe is reserved through the core rod, the outer diameter of the center pipe is equal to the inner diameter of the formed middle pipe, and the hardness and other properties of the formed middle pipe are improved by adopting a hammering and punching mode.
(5) And taking down the primary middle pipe, coating a quenching agent on the surface of the primary middle pipe, wrapping the primary middle pipe by using tin foil, quenching the primary middle pipe in a quenching furnace, taking down the tin foil, performing water cooling in water, and repeating the quenching treatment and the water cooling for 4 times to finish the forming of the middle pipe.
Further, the quenching agent is prepared from the following raw materials in parts by weight:
8 parts of 2-sodium acrylate homopolymer, 4 parts of ammonium acetate, 3 parts of sodium benzoate, 7 parts of triisopropyl phosphite, 4 parts of polyethylene wax, 3 parts of lauryl acetate and 40 parts of deionized water;
the preparation process of the quenching agent is as follows:
weighing deionized water, placing the deionized water in a stirrer, adding a 2-sodium acrylate homopolymer, ammonium acetate, triisopropyl phosphite and polyethylene wax into the stirrer, and mixing for 24min at the temperature of 50 ℃ and the rotating speed of 310 r/min;
adding sodium benzoate and lauryl acetate into a stirrer, heating to 80 ℃ while stirring, and mixing for 12min under the condition of 840r/min to prepare a quenching agent;
wherein the temperature rise is carried out at a rate of 20 ℃/min.
Further, the quenching treatment temperature is 720 ℃ and the time is 30min.
Further, the water cooling time was 12min.
Further, after the quenching treatment and the water cooling are completed, the formed middle pipe is taken out, and the smooth formed middle pipe is polished by adopting a 00-mesh abrasive cloth.
In this embodiment, it should be noted that the present invention provides a quenching agent and a preparation method thereof, the prepared quenching agent is coated on the surface of a primary middle tube, and is wrapped by a tin foil, and then quenching treatment and water cooling are repeated, so that the quenching treatment can greatly improve the effects of rigidity, hardness, wear resistance, fatigue strength, toughness, and the like of the middle tube, and further, the quenching agent is used to enhance the service life and performance of the middle tube, and prevent the middle tube from being oxidized during quenching.
Example 2:
as shown in fig. 1, the invention provides a method for forming a middle tube special for a four-bar linkage, which comprises the following steps:
(1) Taking a middle tube raw material, and putting the middle tube raw material into a smelting furnace for melting to obtain a casting liquid for later use.
Furthermore, when the middle tube raw material is placed in a smelting furnace to be melted, protective gas needs to be introduced into the smelting furnace.
Further, the protective gas is helium.
In this embodiment, it should be noted that the raw material of the middle tube is placed in a melting furnace to be melted to obtain a casting liquid for casting, and the purity of the casting liquid is improved by the protective gas, so as to prevent the quality of the middle tube formed subsequently from being affected by the reaction between the casting liquid and other gases in the air during the melting process.
(2) And taking an ingot mould, pouring the obtained pouring liquid into the ingot mould, and cooling to obtain the ingot.
Furthermore, before the obtained casting liquid is poured into the ingot mold, a release agent is sprayed on the inner wall of the ingot mold, and the release agent is precoated sand.
In the embodiment, the cooled ingot can be conveniently separated from the ingot mold through the provided precoated sand.
(3) Repeatedly beating the ingot into a plate strip, bending the plate strip in a bending device to obtain a bent strip, pouring a casting liquid at the joint of the bent strip, and cooling to obtain a pipe body.
Further, when the plate strip is placed in a bending device for bending, the plate strip is heated to be softened.
In the embodiment, the ingot is beaten into the plate strip repeatedly at first, and then is bent, and the gap at the bent joint is sealed to obtain the pipe body, so that the condition that the gap at the bent joint is not tightly sealed when the pipe body is subsequently stamped by an upper die and a lower die is avoided, and in addition, the plate strip is heated to be softened, so that the plate strip can be bent conveniently.
(4) And (3) putting a core rod into the pipe body, then putting the core rod into a lower die, and stamping the core rod by using an upper die to obtain the primary middle pipe.
Furthermore, in the process of punching the bent belt by the upper die, the bent belt in the lower die is rotated once every 3 times of punching.
In the embodiment, the center pipe of the middle pipe is reserved through the core rod, the outer diameter of the center pipe is equal to the inner diameter of the formed middle pipe, and the hardness and other properties of the formed middle pipe are improved by adopting a hammering and punching mode.
(5) And taking down the primary middle pipe, coating a quenching agent on the surface of the primary middle pipe, wrapping the primary middle pipe by using tin foil, quenching the primary middle pipe in a quenching furnace, taking down the tin foil, performing water cooling in water, and repeating the quenching treatment and the water cooling for 3 times to finish the forming of the middle pipe.
Further, the quenching agent is prepared from the following raw materials in parts by weight:
6 parts of 2-sodium acrylate homopolymer, 2 parts of ammonium acetate, 1 part of sodium benzoate, 3 parts of triisopropyl phosphite, 2 parts of polyethylene wax, 1 part of lauryl acetate and 20 parts of deionized water;
the preparation process of the quenching agent comprises the following steps:
weighing deionized water, placing the deionized water in a stirrer, adding a 2-sodium acrylate homopolymer, ammonium acetate, triisopropyl phosphite and polyethylene wax into the stirrer, and mixing for 22min at 40 ℃ and the rotating speed of 300 r/min;
adding sodium benzoate and lauryl acetate into a stirrer, heating to 80 ℃ while stirring, and mixing for 10min under the condition of 820r/min to prepare a quenching agent;
wherein the temperature is increased at a rate of 15 ℃/min.
Further, the quenching treatment temperature is 610-DEG C, and the time is 20min.
Further, the water cooling time was 10min.
Further, after the quenching treatment and the water cooling are completed, the formed middle pipe is taken out, and the smooth formed middle pipe is polished by using 80-mesh abrasive cloth.
In this embodiment, it should be noted that the present invention provides a quenching agent and a preparation method thereof, the prepared quenching agent is coated on the surface of a primary middle tube, and is wrapped by a tin foil, and then quenching treatment and water cooling are repeated, so that the quenching treatment can greatly improve the effects of rigidity, hardness, wear resistance, fatigue strength, toughness, and the like of the middle tube, and further, the quenching agent is used to enhance the service life and performance of the middle tube, and prevent the middle tube from being oxidized during quenching.
Example 3:
as shown in fig. 1, the invention provides a method for forming a middle tube special for a four-bar linkage, which comprises the following steps:
(1) Taking a middle pipe raw material, and putting the middle pipe raw material into a smelting furnace for melting to obtain a casting liquid for later use.
Furthermore, when the middle tube raw material is placed in a smelting furnace to be melted, protective gas needs to be introduced into the smelting furnace.
Further, the protective gas is argon.
In this embodiment, it should be noted that the raw material of the middle tube is placed in a melting furnace to be melted to obtain a casting liquid for casting, and the purity of the casting liquid is improved by the protective gas, so as to prevent the quality of the middle tube formed subsequently from being affected by the reaction between the casting liquid and other gases in the air during the melting process.
(2) And taking an ingot mould, pouring the obtained pouring liquid into the ingot mould, and cooling to obtain the ingot.
Furthermore, before the obtained casting liquid is poured into the ingot mold, a release agent is sprayed on the inner wall of the ingot mold, and the release agent is precoated sand.
In the embodiment, the provided precoated sand can enable the cooled ingot to be conveniently separated from the ingot mold.
(3) Repeatedly beating the ingot into a plate strip, bending the plate strip in a bending device to obtain a bent strip, pouring a casting liquid at the joint of the bent strip, and cooling to obtain a pipe body.
Further, when the plate strip is placed in a bending device for bending, the plate strip is heated to be softened.
In the embodiment, the ingot is beaten into the plate strip repeatedly at first, and then is bent, and the gap at the bent joint is sealed to obtain the pipe body, so that the condition that the gap at the bent joint is not tightly sealed when the pipe body is subsequently stamped by an upper die and a lower die is avoided, and in addition, the plate strip is heated to be softened, so that the plate strip can be bent conveniently.
(4) And (3) putting a core rod into the pipe body, then putting the core rod into a lower die, and stamping the core rod by using an upper die to obtain the primary middle pipe.
Furthermore, in the process of punching the bent belt by the upper die, the bent belt in the lower die rotates once every 4 times of punching.
In the embodiment, the center pipe of the middle pipe is reserved through the core rod, the outer diameter of the center pipe is equal to the inner diameter of the formed middle pipe, and the hardness and other properties of the formed middle pipe are improved by adopting a hammering and punching mode.
(5) And taking down the primary middle pipe, coating a quenching agent on the surface of the primary middle pipe, wrapping the primary middle pipe by using tin foil, quenching the primary middle pipe in a quenching furnace, taking down the tin foil, performing water cooling in water, and repeating the quenching treatment and the water cooling for 4 times to finish the forming of the middle pipe.
Further, the quenching agent is prepared from the following raw materials in parts by weight:
7 parts of 2-sodium acrylate homopolymer, 3 parts of ammonium acetate, 2 parts of sodium benzoate, 5 parts of triisopropyl phosphite, 3 parts of polyethylene wax, 2 parts of lauryl acetate and 30 parts of deionized water;
the preparation process of the quenching agent is as follows:
weighing deionized water, placing the deionized water in a stirrer, adding a 2-sodium acrylate homopolymer, ammonium acetate, triisopropyl phosphite and polyethylene wax into the stirrer, and mixing for 23min at the temperature of 45 ℃ and the rotating speed of 305 r/min;
adding sodium benzoate and lauryl acetate into a stirrer, heating to 80 ℃ while stirring, and mixing for 11min under the condition of 830r/min to prepare a quenching agent;
wherein the temperature is raised at a rate of 17 ℃/min.
Further, the quenching treatment temperature is 680 ℃ and the time is 25min.
Further, the water cooling time was 11min.
Further, after the quenching treatment and the water cooling are completed, the formed middle pipe is taken out, and the smooth formed middle pipe is polished by using 90-mesh abrasive cloth.
In this embodiment, it should be noted that the present invention provides a quenching agent and a preparation method thereof, the prepared quenching agent is coated on the surface of a primary middle tube, and is wrapped by a tin foil, and then quenching treatment and water cooling are repeated, so that the quenching treatment can greatly improve the effects of rigidity, hardness, wear resistance, fatigue strength, toughness, and the like of the middle tube, and further, the quenching agent is used to enhance the service life and performance of the middle tube, and prevent the middle tube from being oxidized during quenching.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (10)
1. A method for forming a middle pipe special for a four-bar linkage is characterized by comprising the following steps:
(1) Taking a middle pipe raw material, and putting the middle pipe raw material into a smelting furnace for melting to obtain a casting liquid for later use;
(2) Taking an ingot mould, pouring the obtained pouring liquid into the ingot mould, and cooling to obtain an ingot;
(3) Repeatedly beating the ingot into a plate strip, bending the plate strip in a bending device to obtain a bent strip, pouring a casting liquid at the joint of the bent strip, and cooling to obtain a pipe body;
(4) Putting a core rod into the pipe body, then putting the core rod into a lower die, and stamping the core rod by using an upper die to obtain a primary middle pipe;
(5) And taking down the primary middle pipe, coating a quenching agent on the surface of the primary middle pipe, wrapping the primary middle pipe by using tin foil, quenching the primary middle pipe in a quenching furnace, taking down the tin foil, cooling the tin foil in water, and repeating the quenching treatment and the water cooling for 3-4 times to finish the forming of the middle pipe.
2. The method for forming the middle tube special for the four-bar linkage according to claim 1, wherein in the step (1), when the raw material of the middle tube is placed in a smelting furnace to be melted, protective gas needs to be introduced into the smelting furnace.
3. The method for forming the middle tube special for the four-bar linkage as recited in claim 2, wherein the protective gas is any one of helium or argon.
4. The method for forming the middle pipe special for the four-bar linkage according to claim 1, wherein in the step (2), before the obtained casting liquid is poured into the ingot mold, a release agent is sprayed on the inner wall of the ingot mold, and the release agent is coated sand.
5. The method for forming the middle tube special for the four-bar linkage as claimed in claim 1, wherein in the step (3), the strip is heated to be softened when the strip is placed in the bending device for bending.
6. The method for forming the middle pipe special for the four-bar linkage according to claim 1, wherein in the step (4), the bending belt in the lower die is rotated once every 3-4 times in the process of punching the bending belt by the upper die.
7. The forming method of the middle pipe special for the four-bar linkage as claimed in claim 1, wherein in the step (5), the quenching agent is made of the following raw materials in parts by weight:
6-8 parts of 2-sodium acrylate homopolymer, 2-4 parts of ammonium acetate, 1-3 parts of sodium benzoate, 3-7 parts of triisopropyl phosphite, 2-4 parts of polyethylene wax, 1-3 parts of lauryl acetate and 20-40 parts of deionized water;
the preparation process of the quenching agent comprises the following steps:
weighing deionized water, placing in a stirrer, adding 2-sodium acrylate homopolymer, ammonium acetate, triisopropyl phosphite and polyethylene wax into the stirrer, and mixing at 40-50 deg.C and rotation speed of 300-310r/min for 22-24min;
adding sodium benzoate and lauryl acetate into a stirrer, heating to 80 ℃ while stirring, and mixing for 10-12min under the condition of 820-840r/min to obtain a quenching agent;
wherein the temperature rise is carried out at a speed of 15-20 ℃/min.
8. The forming method of the middle pipe special for the four-bar linkage according to claim 1, wherein in the step (5), the temperature of the quenching treatment is 610-720 ℃ and the time is 20-30min.
9. The forming method of the middle pipe special for the four-bar linkage as claimed in claim 1, wherein in the step (5), the water cooling time is 10-12min.
10. The method as claimed in claim 1, wherein in step (5), after the quenching treatment and the water cooling are completed, the formed middle tube is taken out, and the smooth formed middle tube is polished by using an abrasive cloth of 80-100 meshes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211481268.2A CN115846454A (en) | 2022-11-24 | 2022-11-24 | Method for forming middle pipe special for four-connecting rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211481268.2A CN115846454A (en) | 2022-11-24 | 2022-11-24 | Method for forming middle pipe special for four-connecting rod |
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| Publication Number | Publication Date |
|---|---|
| CN115846454A true CN115846454A (en) | 2023-03-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211481268.2A Pending CN115846454A (en) | 2022-11-24 | 2022-11-24 | Method for forming middle pipe special for four-connecting rod |
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| Country | Link |
|---|---|
| CN (1) | CN115846454A (en) |
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2022
- 2022-11-24 CN CN202211481268.2A patent/CN115846454A/en active Pending
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