CN109605729B - Method for preparing damping connection structure by using 3D printing technology - Google Patents
Method for preparing damping connection structure by using 3D printing technology Download PDFInfo
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- CN109605729B CN109605729B CN201811194024.XA CN201811194024A CN109605729B CN 109605729 B CN109605729 B CN 109605729B CN 201811194024 A CN201811194024 A CN 201811194024A CN 109605729 B CN109605729 B CN 109605729B
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- connecting rod
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- shock
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/10—Processes of additive manufacturing
- B29C64/106—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material
- B29C64/118—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using filamentary material being melted, e.g. fused deposition modelling [FDM]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/30—Auxiliary operations or equipment
- B29C64/386—Data acquisition or data processing for additive manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y50/00—Data acquisition or data processing for additive manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/721—Vibration dampening equipment, e.g. shock absorbers
Abstract
The invention provides a method for preparing a damping connection structure by using a 3D printing technology, which comprises the following steps: s1, dividing the damping connection structure into 3 structural parts; s2, establishing a bearing plate model diagram corresponding to each structural part in a computer, and preparing a corresponding bearing plate through laser cutting; s3, establishing a three-dimensional solid model corresponding to each structural part, converting the three-dimensional solid model into printing parameters of a printer through slicing parameter software, and inputting the printing parameters into the fused deposition modeling 3D printer; s4, starting a printer, preparing a printing piece of each structural part by using the fused deposition molded 3D printer, and combining the printing piece with the bearing plate prepared in the step S2 to prepare a corresponding structural part; and S5, assembling the structural member prepared in the step S3 to obtain the shock-absorbing connecting structure. According to the method, the 3D printing piece and the bearing plate are combined for forming, so that the prepared structure has the advantages of diversified shapes and high load performance.
Description
Technical Field
The invention relates to the technical field of 3D printing, in particular to a method for preparing a damping connection structure by using a 3D printing technology.
Background
Extreme sports such as mountain cross-country sports or fast-descent sports have high requirements on bicycles, and particularly, a good shock-absorbing system can reduce the loss of the bicycle and the body of a person to the maximum extent under the condition of poor road conditions.
However, the traditional forming method of the connecting structure of the shock absorbing system is a metal mold-opening casting integrated forming method, and the forming efficiency of the method is relatively low, so that the metal mold-opening casting technology is replaced by a 3D printing technology at present to achieve the purpose of rapid forming. The 3D printing technique, also known as additive manufacturing technique, belongs to a rapid prototyping technique, and is generally a technique of constructing an object by stacking and accumulating layer by layer using a digital model file as a basis and using a powder metal or plastic stool bondable material, i.e., a "build-up modeling method".
In the invention patent with application number cn201610615212.x, a method for preparing a metal casting based on 3D printing technology is disclosed, including but not limited to the following steps: (1) obtaining a 3D printing model of the target metal casting by adopting a 3D printing technology; (2) polishing the 3D printing model; (3) obtaining a shell by adopting the processed 3D printing model through a casting process; (4) and heating and roasting the shell to ensure that the 3D printing model is completely combusted, vaporized and disappeared, and pouring molten metal liquid into the shell to obtain a metal casting. By the mode, the invention saves the cost of the die, shortens the manufacturing period of parts, can conveniently realize the casting of complex castings, and the obtained castings have higher dimensional precision, surface finish and casting consistency and are particularly suitable for the production of small-batch complex metal castings; however, the castings prepared by the method are heavy and relatively high in cost.
In the invention patent with application number CN201710571006.8, a method for producing a bicycle frame by using 3D printing technology is disclosed. The method comprises the following steps: A. dividing the frame into a plurality of structural members, wherein each structural member comprises a head pipe, an inserting side plate, an upper pipe and a lower pipe; the head pipe, the inserting side plate, the upper pipe and the lower pipe are all provided with inserting structures; B. standardized production of each structural part by using a 3D printing technology; C. the upper pipe and the lower pipe are respectively connected with the head pipe in a plug-in manner; then is connected with the plugging side plate in a plugging way. The method has the advantages of simple operation, high product yield, high automation degree of the production process, easy control of product quality, high standardization degree and stable product quality, but the structural member produced by the method is made of carbon fiber materials, has relatively high cost and cannot meet diversified appearance structures.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a method for manufacturing a shock-absorbing connecting structure by using a 3D printing technology, the method combines a plurality of composite processes of a 3D printed part and a laser cut part to form a shock-absorbing connecting structure, the method has a high degree of automation, and the composite forming method can make the manufactured structure have the advantages of diversified appearance, light weight, low cost and strong load-carrying capacity.
The invention further aims to provide a method for preparing the shock-absorbing connecting structure by using the 3D printing technology, which is simple in process, low in cost and suitable for popularization and application.
In order to achieve the above object, the technical solution of the present invention is as follows.
A method for preparing a damping connecting structure by using a 3D printing technology comprises the following steps:
s1, dividing the damping connection structure into 3 structural parts;
s2, establishing a bearing plate model diagram corresponding to each structural part in a computer, and preparing a corresponding bearing plate through laser cutting;
s3, establishing a three-dimensional solid model corresponding to each structural part, converting the three-dimensional solid model into printing parameters of a printer through slicing parameter software, and inputting the printing parameters into the fused deposition modeling 3D printer;
s4, starting a printer, preparing a printing piece of each structural part by using the fused deposition molded 3D printer, and combining the printing piece with the bearing plate prepared in the step S2 to prepare a corresponding structural part;
and S5, assembling the structural member prepared in the step S3 to obtain the shock-absorbing connecting structure.
Further, the bearing plate in step S2 is a skeleton structure of the corresponding structural member, and can support the weight of the corresponding structural member after being combined with the printed member.
Further, the material of bearing plate is carbon fiber material or metal, the material of printing is thermoplastic material.
Furthermore, the material of the bearing plate is stainless steel, and the material of the printing piece is plastic.
Further, in step S4, the print element and the bearing plate are combined in such a manner that the bearing plate is embedded in the print element or the bearing plate is screwed to the print element.
Further, when the bearing plate is embedded in the print member, the bearing plate needs to be placed in the print member for fused deposition modeling 3D printing in step S4.
Further, when the bearing plate is screwed to the print member, the print member formed by fused deposition modeling needs to be removed and screwed to the bearing plate in step S4.
Furthermore, when the bearing plate is screwed with the printed material, the resin adhesive is coated on the surface of the bearing plate combined with the printed material.
Further, in the step S4, a nozzle is disposed on the fused deposition modeling 3D printer, and a fine nozzle with an inner diameter of 0.4mm is disposed at the bottom of the nozzle;
in step S4, the micro nozzle is moved to a predetermined position of the three-dimensional solid model on the printer, and the liquid material in a molten state is extruded and finally solidified, and the solidified material is deposited layer by layer to form a printed material.
Further, the structure includes a first connecting rod, a second connecting rod and a third connecting rod, and the specific step of step S5 is to install the first connecting rod in the lower part of the second connecting rod and the third connecting rod, to fixedly connect one end of the first connecting rod with the second connecting rod, and to hinge the first connecting rod with the third connecting rod, to hinge the other end of the first connecting rod with the second connecting rod, so that the other end of the third connecting rod rotates to drive the first connecting rod and the second connecting rod to rotate, thereby obtaining the shock-absorbing connection structure.
The invention has the beneficial effects that: compared with the prior art, the method for preparing the shock absorption connecting structure by using the 3D printing technology, which is provided by the invention, is formed by combining various composite processes of a 3D printing piece and a laser-cut bearing plate, the automation degree is higher, and the composite forming mode can ensure that the prepared structure has the advantages of diversified appearance, light weight, low cost and stronger load performance; the structure prepared by the method is a connecting structure of a bicycle rear-inserted double-sliding-rod shock absorption system, the third connecting rod is used for connecting a shock absorption cylinder or a shock absorption spring, and when the bicycle is stressed, the floating rotating point rotates to compress the shock absorption spring to play a shock absorption role.
Drawings
FIG. 1 is a schematic flow chart of the present invention.
FIG. 2 is a schematic structural view of a shock-absorbing connecting structure manufactured according to the method of the present invention.
Fig. 3 is a front view of a shock-absorbing coupling structure manufactured according to the method of the present invention.
Figure 4 is an exploded view of a shock absorbing attachment structure made according to the method of the present invention.
FIG. 5 is a front view of a first connecting rod in a shock-absorbing connecting structure manufactured according to the method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
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.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
Descriptions in this specification as relating to "first", "second", etc. are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to any indicated technical feature or quantity. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
In the description of the present invention, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
Example 1
Referring to fig. 1, a method for preparing a shock-absorbing connecting structure by using a 3D printing technology provided by the present invention includes the following steps:
s1, dividing the damping connection structure into 3 structural parts;
s2, establishing a bearing plate model diagram corresponding to each structural part in a computer, and preparing a corresponding bearing plate through laser cutting;
s3, establishing a three-dimensional solid model corresponding to each structural part, converting the three-dimensional solid model into printing parameters of a printer through slicing parameter software, and inputting the printing parameters into the fused deposition modeling 3D printer;
s4, starting a printer, preparing a printing piece of each structural part by using the fused deposition molded 3D printer, and combining the printing piece with the bearing plate prepared in the step S2 to prepare a corresponding structural part;
and S5, assembling the structural member prepared in the step S3 to obtain the shock-absorbing connecting structure.
It should be noted that the invention combines the 3D printing piece formed by fused deposition and various composite processes of the bearing plate formed by laser cutting, the whole process is automatically controlled, the working efficiency is improved, and the composite forming mode can ensure that the prepared structure has the advantages of diversified appearance, light weight, low cost and stronger load performance, the process is simple, the operation is convenient, and the invention is suitable for popularization and application.
In this embodiment, the bearing plate in step S2 is a skeleton structure of the corresponding structural member, and can support the weight of the corresponding structural member after being combined with the printed material.
Preferably, the material of the bearing plate is carbon fiber material, and the material of the printing member is plastic.
Preferably, in step S4, the print element is coupled to the bearing plate in such a manner that the bearing plate is embedded in the print element.
In step S4, a nozzle is provided on the fused deposition molded 3D printer, and a fine nozzle with an inner diameter of 0.4mm is provided at the bottom of the nozzle;
in step S4, the micro nozzle is moved to a predetermined position of the three-dimensional solid model on the printer, and the liquid material in a molten state is extruded and finally solidified, and the solidified material is deposited layer by layer to form a printed material.
The 3D printing technique used in the present invention is to heat and melt a filamentous thermoplastic material as a raw material by a nozzle to obtain a liquid raw material, create three-dimensional model data using a bearing plate as a skeleton, move a fine nozzle to a predetermined position of the three-dimensional model, extrude and spray the liquid raw material in a molten state, finally solidify the liquid raw material, and build up the liquid raw material layer by layer on the solidified material to form a finished structural member.
In this embodiment, the structural member includes a first connecting rod, a second connecting rod and a third connecting rod, and the step S5 includes installing the first connecting rod at the lower portion of the second connecting rod and the third connecting rod, and fixedly connecting one end of the first connecting rod with the second connecting rod, and hinging the first connecting rod with the third connecting rod, and hinging the other end of the first connecting rod with the second connecting rod, so that the other end of the third connecting rod rotates to drive the first connecting rod and the second connecting rod to rotate, thereby obtaining the shock-absorbing connection structure.
Referring to fig. 2 to 5, in order to manufacture the shock-absorbing connecting structure according to the method of the present invention, a first connecting rod 1 is disposed at a lower side of a second connecting rod 2 and a third connecting rod 3, a square first fixing block 11 is disposed at one end of the first connecting rod 1, a circular second fixing block 12 is disposed at the other end of the first connecting rod 1, one end of the second connecting rod 2 is detachably connected to the first fixing block 11, the other end of the second connecting rod 2 is hinged to the second fixing block 12, the third connecting rod 3 is disposed at one side of the second connecting rod 2 and is located on a plane with the second connecting rod 2, and one end of the third connecting rod 3 is hinged to the first fixing block 11.
The first fixing block 11 is provided with a first fixing hole 13 for fixing the second connecting rod 2 and a second fixing hole 14 for connecting the third connecting rod 3, one end of the second connecting rod 2 is provided with a third fixing hole 22 matched with the first fixing hole 13, and one end of the third connecting rod 3 is provided with a fourth fixing hole 32 matched with the second fixing hole 14.
The inner diameter of the first fixing hole 13 is the same as that of the third fixing hole 22, and the inner diameter of the second fixing hole 14 is the same as that of the fourth fixing hole 32. Specifically, first fixed block mainly plays the effect of connecting second connecting rod and third connecting rod, is convenient for drive the rotation of first connecting rod and second connecting rod through the rotation of third connecting rod, plays absorbing effect.
One end of the second connecting rod 2 is provided with a third fixed block 23 matched with the second fixed block 14, the third fixed block 23 is circular, and the outer diameter of the third fixed block 23 is consistent with that of the second fixed block 14. Specifically, the third fixing block is connected with the second fixing block which is a mirror image, and the fixing effect is achieved.
One of connecting with the head rod 1 on the third connecting rod 3 serves and is equipped with an arcuate installation piece 31, and one that second connecting rod 2 meets with third connecting rod 3 serves and is equipped with the arc recess 21 with the arc shape looks adaptation of installation piece 31, and the rotation of the third connecting rod 3 of being convenient for avoids the third connecting rod to take place the friction with the one end of second connecting rod at the rotation in-process to influence the life of this structure.
Keep away from one of third connecting rod 3 on second connecting rod 2 and serve and be equipped with first support arm 24, be equipped with on first connecting rod 1 with first support arm 24 mirror symmetry's second support arm 15, first support arm 24 sets up the upside at second support arm 15, the middle part of first connecting rod 1 is equipped with first bar hole 16, be provided with on second connecting rod 2 with first bar hole 16 mirror symmetry's second bar hole 25, be equipped with a plurality of through-holes 33 on the third connecting rod 3, and the shape of every through-hole all is different. The shape of each structural member can be designed by the preparation method of the invention so as to meet the requirements of different customers.
Specifically, all be equipped with circular gasket 34 on the both ends of third connecting rod 3, the installation of the third connecting rod 3 of being convenient for to reduce wear improves life.
In the damping connection structure prepared by the invention, one end of the third connecting rod is used for connecting a damping spring or a damping cylinder, and when the damping spring or the damping cylinder is pressed down by one end of the third connecting rod, the third connecting rod drives one end of the first connecting rod to rotate upwards, so that the second connecting rod rotates along with the first connecting rod, a certain damping effect is achieved, the structure is simple, the installation is convenient and fast, and the cost is lower.
Example 2
Referring to fig. 1 to 5, the difference from the above embodiment is that the material of the bearing plate is metal, preferably stainless steel plate, and the material of the print is thermoplastic material, preferably plastic. The specific plastic has the characteristics of high-temperature hot melting and low-temperature curing, is convenient for molding appearance characteristics meeting the requirements of customers, and meets the appearance standards of different customers. The bearing plate is made of a bearing material with a strong load and can be combined with 3D printing raw materials to form a composite material with certain strength, so that the requirement of diversified appearance is met, and the strength of the whole structural member is guaranteed to adapt to the strong load.
In this embodiment, the printing element is coupled to the bearing plate in such a manner that the bearing plate is threadedly coupled to the printing element. At this time, in step S4, the fused deposition modeling printed material needs to be removed and then screwed with the bearing plate. Specifically, before the bearing plate is used as a framework, resin glue is coated on the surface of the bearing plate combined with a printed product, so that the adhesion degree of the bearing plate and a 3D printed product is improved, and the load strength of the structure is enhanced.
In the embodiment, the 3D printing technology adopted by the method is FDM (fused deposition modeling), the technology in the existing market is only used on the unstressed or slightly stressed structures such as product prototype tests, molds, shells and the like, on the basis of the prior art, the invention adds some materials capable of bearing load, such as carbon fiber plates, so that the finished structural member can be directly used on the structure with larger stress, and the invention can add bearing plates into the 3D printed product in a screwing, adhering and fixing or direct embedding mode, so that the obtained composite material can achieve the advantages of diversified appearance, light weight and low cost, and can ensure the strength of the whole structural member to adapt to stronger load.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A method for preparing a damping connection structure by using a 3D printing technology is characterized by comprising the following steps:
s1, dividing the damping connection structure into 3 structural parts;
s2, establishing a bearing plate model diagram corresponding to each structural part in a computer, and preparing a corresponding bearing plate through laser cutting;
s3, establishing a three-dimensional solid model corresponding to each structural part, converting the three-dimensional solid model into printing parameters of a printer through slicing parameter software, and inputting the printing parameters into the fused deposition modeling 3D printer;
s4, starting a printer, preparing a printing piece of each structural part by using the fused deposition molded 3D printer, and combining the printing piece with the bearing plate prepared in the step S2 to prepare a corresponding structural part;
s5, assembling the structural part obtained in the step S3 to obtain a damping connecting structure;
the structural member includes a first connecting rod, a second connecting rod and a third connecting rod, the step S5 includes installing the first connecting rod at the lower part of the second connecting rod and the third connecting rod, and connecting one end of the first connecting rod with the second connecting rod, and the third connecting rod, and the other end of the first connecting rod with the second connecting rod, so that the other end of the third connecting rod can rotate to drive the first connecting rod and the second connecting rod, thereby obtaining the shock-absorbing connection structure.
2. The method for preparing a shock-absorbing connecting structure using 3D printing technology as claimed in claim 1, wherein the bearing plate in step S2 is a skeleton structure of the corresponding structural member, and can support the weight of the corresponding structural member after being combined with the printed member.
3. The method for preparing a shock-absorbing connecting structure by using a 3D printing technology as claimed in claim 1, wherein the material of the bearing plate is a carbon fiber material or a metal, and the material of the printed matter is a thermoplastic material.
4. The method for preparing a shock-absorbing connection structure using 3D printing technology as claimed in claim 3, wherein the material of the bearing plate is stainless steel, and the material of the printed material is plastic.
5. The method for preparing a shock-absorbing connecting structure according to claim 1, wherein the printing member is combined with the supporting plate in such a manner that the supporting plate is embedded in the printing member or the supporting plate is screw-coupled to the printing member in step S4.
6. The method for preparing a shock-absorbing coupling structure using 3D printing technique according to claim 5, wherein when the load-bearing plate is embedded in the printing member, the load-bearing plate is placed in the printing member for 3D printing of fused deposition modeling in step S4.
7. The method for preparing a shock-absorbing connecting structure according to claim 5, wherein when the bearing plate is screw-coupled to the printed material, the printed material obtained by fused deposition modeling is removed and then screw-coupled to the bearing plate in step S4.
8. The method for preparing a shock-absorbing coupling structure according to claim 5, wherein when the bearing plate is screw-coupled to the printing member, a resin paste is applied to a surface of the bearing plate, which is coupled to the printing member, in advance.
9. The method for preparing a shock-absorbing connecting structure using 3D printing technology as claimed in claim 1, wherein in step S4, a spray head is provided on the fused deposition modeling 3D printer, and a fine nozzle with an inner diameter of 0.4mm is provided at the bottom of the spray head;
in step S4, the micro nozzle is moved to a predetermined position of the three-dimensional solid model on the printer, and the liquid material in a molten state is extruded and finally solidified, and the solidified material is deposited layer by layer to form a printed material.
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| CN111085899B (en) * | 2019-12-04 | 2021-04-20 | 北京动力机械研究所 | Method for inhibiting machining flutter of blisk by using filler |
| CN112983978B (en) * | 2021-02-05 | 2023-02-10 | 西安科技大学 | Flexible sliding bearing based on 3D printing and manufacturing method thereof |
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| CN106985394A (en) * | 2017-02-13 | 2017-07-28 | 上海大学 | A kind of 3D model Method of printings assembled based on parted pattern and fastener |
| CN109128162A (en) * | 2018-07-24 | 2019-01-04 | 华中科技大学 | A kind of metal works processing method being embedded in prefabricated component |
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| GB2316046A (en) * | 1996-08-05 | 1998-02-18 | Kao Fu Hsiung | Bicycle shock absorbing arrangement |
| CN201245217Y (en) * | 2008-06-13 | 2009-05-27 | 荣邦机械(昆山)有限公司 | Novel bicycle trailer shock-absorbing device |
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