Inner frame injection molding racket and manufacturing method thereof

Abstract

The present invention relates to an internal skeleton injection molding racket and a manufacturing method thereof, and belongs to the field of sports goods. The existing rackets have complex processes and high use costs during the manufacturing process. The present invention comprises a racket head frame, a connecting piece, a middle pole and a racket handle, wherein the racket head structure is formed by an I-beam, the middle pole is a circular long strip structure, the connecting piece is a T-shaped tee, the T-shaped tee of the connecting piece connects the racket head frame and the middle pole, and the racket handle is connected to the middle pole; the characteristic is that: the racket head frame is an I-shaped structure, the racket head frame is composed of an I-shaped middle beam and two I-shaped side beams, the I-shaped middle beam is located on the left side of the I-shaped central axis, and the two ends of the I-shaped middle beam form an outer groove and an inner groove, and the depth of the outer groove is greater than the depth of the inner groove; the cross section of the I-shaped side beam is a triangle, and the top ends of the two I-shaped side beams are provided with side beam ribs of a certain width. The present invention is integrally formed by injection molding, and the overall weight of the racket is light and the consistency is good.

Description

Technical Field

[0001] The invention relates to an inner frame injection-molded racket and a manufacturing method thereof, belongs to the field of sports goods, and is mainly used for manufacturing the racket. Background Art

[0002] At present, during the manufacturing process of rackets, racket profiles are mostly made of aluminum alloy materials to manufacture the racket head structure. After processing and forming, they are rounded to form the overall frame of the racket head, and then the center seams of the racket profiles are drilled one by one to form holes for installing the wire nails. This drilling method for the formed profiles has low drilling efficiency, many burrs on the hole mouth, large hole spacing tolerance, poor hole consistency, and the wire nails are also installed separately. The installation process of the wire nails is cumbersome, the appearance is not beautiful, and wrinkles are easily generated on the surface; the existing molded carbon rackets or integrated rackets need to be coated, painted or sprayed through processes such as putty filling, and the racket body has low strength, is thick and easy to break.

[0003] The Chinese patent CN201510199883.8, which was published on July 15, 2015, discloses an injection-molded racket, which is composed of a handle 1, a handle 2, a positive rubber surface, a racket face, a reverse rubber surface and a handle 3. The injection-molded racket is characterized in that: the thickness of the round surface of the racket face is 4 mm, the handle and the racket face are made by a one-time injection molding process, and the injection-molded racket is made of high-quality plastic steel particles, which require high hardness, high elasticity, good toughness, and good long-lasting wear resistance and weathering resistance; the thickness of the handle 1, the handle 2 and the handle 3 is 3 cm. The injection-molded racket is molded by one-time injection molding, which reduces the process of manufacturing the injection-molded racket, but the racket as a whole lacks a skeleton, the strength of the network line cannot meet the use requirements, and the stability is insufficient; it is easy to break and damage during use; the wire nails lack a reasonable structure and are inconvenient to install. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art and to provide an inner frame injection molding racket and a manufacturing method thereof which has a reasonable structural design, stable structure, good strength, good shock absorption effect, and eliminates the need for installation of protective wires and is lighter in weight.

[0005] The technical solution adopted by the present invention to solve the above-mentioned problem is: the internal skeleton injection-molded racket includes a racket head frame, a connecting piece, a middle pole and a racket handle, the racket head frame is formed by an I-beam, the middle pole is a circular long strip structure, the connecting piece is a T-shaped tee, the T-shaped tee of the connecting piece connects the racket head frame and the middle pole, and the racket handle is connected to the middle pole; it is characterized in that: the racket head frame is an I-shaped structure, the racket head frame is composed of an I-shaped middle beam and two I-shaped side beams, the I-shaped middle beam is located on the left side of the I-shaped central axis, and forms an outer groove and an inner groove on the left and right sides with the I-shaped side beams at the upper and lower ends, and the depth of the outer groove is greater than the depth of the inner groove; there are multiple middle seam holes on the racket head frame; the cross-section of the I-shaped side beam is triangular, and the tops of the two I-shaped side beams are provided with side beam ribs of a certain width; the I-shaped beam increases the torsional strength and stability.

[0006] Furthermore, the racket head frame of the present invention is made of aluminum alloy and has a hollow structure inside; the hollow structure reduces the overall weight, making it easier to swing the racket.

[0007] Furthermore, the center hole on the racket head frame of the present invention is punched by punching, which has good consistency.

[0008] Furthermore, the inner wall of the center hole of the present invention is bent and extended toward the two ends of the inner groove along the punching direction, forming a closed structure for the hollow I-beam, thereby preventing injection molding into the I-beam structure.

[0009] Furthermore, the present invention connects the racket head frame and the middle pole using a T-shaped connector that is replaced by a filler welding method; a variety of connection methods ensure the diversity of the process.

[0010] Furthermore, the handle of the present invention is integrally formed by injection molding, and the handle is a hollow structure; the handle is injection molded, and no grip is required inside, so that the overall weight of the racket is lighter.

[0011] The present invention also includes a method for manufacturing an inner frame injection-molded racket, which is characterized by comprising the following steps:

[0012] Step 1: Place the rounded racket head frame on the punching machine for punching;

[0013] Step 2: Use T-shaped tee or filler welding to connect and fix the racket head frame and the middle pole;

[0014] Step 3: Place the connected and fixed racket head frame and middle pole on the injection molding machine for injection molding, so as to wrap the racket head frame and middle pole and form an integrated racket handle; through the injection molding process and the appearance of the all-carbon racket, the efficiency is higher, and the racket is wrapped as a whole and is not easy to break.

[0015] Furthermore, after the injection molding in step three of the present invention, a handle is formed at the lower end of the middle rod.

[0016] Furthermore, in the present invention, after the injection molding in step three, a wire guard nail is formed at each center seam hole, thereby eliminating the process of installing the wire guard nails on an ordinary racket, which is more convenient.

[0017] Furthermore, in step three of the present invention, carbon powder and fiber are added during the injection molding process; the addition of carbon powder and fiber improves the overall tensile strength.

[0018] Compared with the prior art, the present invention has the following advantages and effects: the racket profile of the present invention has high overall structural strength, high torsional strength, and is not prone to torsional deformation. During injection molding, no glue flow will occur inside the profile. The guard wire and the handle are integrally formed by injection molding. The overall racket is light in weight, has good consistency, good injection molding efficiency, simple process, safe to use, and not easy to break. The painting steps and the installation of guard wire nails are omitted, the cost is lower, the shock absorption effect is good, and sports injuries during use are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the main structure of the racket head frame according to an embodiment of the present invention.

[0020] Figure 2 It is a schematic diagram of the connection structure between the racket head frame and the middle rod according to an embodiment of the present invention.

[0021] Figure 3 yes Figure 1 Schematic diagram of the cross-sectional structure of AA.

[0022] Figure 4 It is a schematic diagram of the structure of the embodiment of the present invention after injection molding is completed.

[0023] Figure 5 yes Figure 4 Schematic diagram of the cross-sectional structure of BB.

[0024] Figure 6 It is a left-side structural schematic diagram of the injection molding of an embodiment of the present invention.

[0025] In the figure: 1- racket head frame; 11- I-shaped middle beam; 12- I-shaped side beam; 13- outer groove; 14- inner groove; 15- side beam rib; 16- middle seam hole; 17- hole inner wall; 2- connecting piece; 21- T-shaped tee; 3- middle rod; 4- racket handle. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and by way of examples. The following examples are intended to explain the present invention but the present invention is not limited to the following examples.

[0027] Example

[0028] See also Figures 1 to 6 The inner frame injection-molded racket in this embodiment includes a racket head frame 1, a connecting member 2, a middle pole 3 and a racket handle 4. The racket head frame 1 is formed by an I-beam, the middle pole 3 is a circular long strip structure, the connecting member 2 is a T-shaped tee 21, the T-shaped tee 21 of the connecting member 2 connects the racket head frame 1 and the middle pole 3, and the racket handle 4 is connected to the middle pole 3; the racket head frame 1 is an I-shaped structure, and the racket head frame 1 is composed of an I-shaped middle beam 11 and two I-shaped side beams 12. The I-shaped middle beam 11 is located on the left side of the I-shaped central axis and is connected to the upper and lower ends. The I-shaped side beam 12 forms an outer groove 13 and an inner groove 14 on the left and right sides, and the depth of the outer groove 13 is greater than the depth of the inner groove 14; there are multiple center holes 16 on the racket head frame 1; the cross-section of the I-shaped side beam 12 is triangular, and the tops of the two I-shaped side beams 12 are provided with side beam ribs 15 of a certain width; the racket is formed into an integral racket frame by injection molding, and the structure of the I-shaped beam ensures the overall strength of the racket head frame 1. Injection molding containing the middle pole 3 as a skeleton is safer, the racket is not easy to break, and the practicality is better.

[0029] like Figure 1-Figure 3 In this embodiment, before the injection molding process is performed, the racket head frame 1 is made of aluminum alloy and has a hollow structure inside; an internal skeleton is formed during the injection molding process, so that the overall structural strength of the racket after injection molding is higher.

[0030] In this embodiment, the center seam hole 16 on the racket head frame 1 is punched by punching; the machine punching method produces less burrs and has high hole consistency, which is convenient for subsequent injection molding processing; UV automatic inkjet printing can be used later.

[0031] like Figure 3 In this embodiment, the inner wall 17 of the center hole 16 is bent and extended toward the two ends of the inner groove 14 along the punching direction. The edge of the I-beam 11 close to the outer groove 13 is recessed inward by punching, and the inner walls 17 on both sides are formed at the center hole 16 of the I-beam 11, so that the I-beam forms a closed structure on both sides.

[0032] In this embodiment, the T-shaped tee 21 of the connecting member 2 connecting the racket head frame 1 and the middle rod 3 can be replaced by a filler welding method.

[0033] like Figure 4-6 In this embodiment, the handle 4 is integrally formed by injection molding, and the handle 4 is a hollow structure; during the injection molding process, the handle 4 is formed by die pressing along the lower end of the middle rod 3. The handle 4 is injection molded without an internal structure, so that the overall racket is lighter.

[0034] In this embodiment, a method for manufacturing an inner skeleton injection-molded racket is provided, comprising the following steps:

[0035] Step 1: Place the rounded racket head frame 1 on a punching machine for punching.

[0036] Step 2: Use T-shaped tee 21 or filler welding to connect and fix the racket head frame 1 and the middle pole 3.

[0037] Step three: Place the connected and fixed racket head frame 1 and middle pole 3 on an injection molding machine for injection molding, and form a racket handle 4 that wraps the racket head frame 1 and the middle pole 3 and is integrally formed; the racket head frame 1 and the middle pole 3 serve as a skeleton in the injection molding process, so that the overall injection molding process ensures the structural strength inside the racket. The injection molding process is highly efficient, and on the basis of ensuring the mechanical function, an appearance consistent with that of a full-carbon racket can be formed, which protects the racket and prevents it from breaking easily.

[0038] In this embodiment, after the injection molding in step three, a handle 4 is formed at the lower end of the middle rod 3. The injection-molded handle 4 has good consistency, which reduces the assembly process of the handle 4 and reduces the cost.

[0039] In this embodiment, after the injection molding in step three, a wire protection nail is formed at each center seam hole 16 , eliminating the need to install wire protection nails one by one for each hole, facilitating processing and improving overall work efficiency.

[0040] In this embodiment, carbon powder and fiber are added during the injection molding process in step three to improve the strength of the injection molding package.

[0041] When manufacturing a racket, first place the racket head frame 1 on a punching machine, and punch holes by setting the punching machine. The punching method has higher consistency than punching holes alone, and the punching method has a high degree of mechanization, and the hole opening is smooth with fewer burrs. After punching, the racket head frame 1 and the middle pole 3 are connected and fixed by a T-shaped tee 21 connector 2 or a filler welding method. After fixing, the structure formed by connecting the racket head frame 1 and the middle pole 3 is placed in an injection mold. During installation, the bottom of the middle pole 3 is not connected to the racket handle 4, and the racket handle 4 is integrally formed by injection molding, such as Figure 5 After injection molding, a layer of plastic wrap is formed on the racket head frame 1 and the middle pole 3, and a wire guard nail is formed on the inner wall of the hole formed by punching. After injection molding, the racket head frame 1 and the middle pole 3 are shaped and wrapped, which increases the structural strength and protection performance. Under the injection molded shell, the handle 4 is injection molded along the lower end of the middle pole 3 to form a complete racket; the shape is the same as that of the carbon racket molded, with high structural strength and good vibration reduction effect, eliminating the wire guard and the filler inside the handle 4, reducing the overall weight.

[0042] In addition, it should be noted that the shapes and names of the parts and components of the specific embodiments described in this specification may be different, and the above content described in this specification is only an example of the structure of the present invention. All equivalent changes or simple changes made based on the structure, features and principles described in the patent concept of the present invention are included in the protection scope of the patent of the present invention. Technicians in the technical field of the present invention can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. An internal skeleton injection-molded racket, comprising a racket head frame (1), a connecting member (2), a middle rod (3) and a racket handle (4), wherein the racket head frame (1) is formed by an I-beam, the middle rod (3) is a circular long strip structure, the connecting member (2) is a T-shaped tee (21), the T-shaped tee (21) of the connecting member (2) connects the racket head frame (1) and the middle rod (3), and the racket handle (4) is connected to the middle rod (3); characterized in that: The racket head frame (1) is an I-shaped structure, and is composed of an I-shaped center beam (11) and two I-shaped side beams (12). The I-shaped center beam (11) is located on the left side of the I-shaped center axis, and forms an outer groove (13) and an inner groove (14) on the left and right sides with the I-shaped side beams (12) at the upper and lower ends, and the depth of the outer groove (13) is greater than the depth of the inner groove (14); a plurality of center holes (16) are provided on the racket head frame (1), and the center holes (16) are The inner wall of the hole (17) is bent and extended toward the two ends of the inner groove (14) along the punching direction. The middle seam hole (16) is punched by punching. The edge of the I-beam (11) close to the outer groove (13) is recessed inward by punching. The inner walls of the hole (17) on both sides are formed at the middle seam hole (16) of the I-beam (11), so that the I-beam forms a structure with closed sides. The cross section of the I-beam side beam (12) is triangular, and the top ends of the two I-beam side beams (12) are provided with side beam ribs (15) of a certain width.

2. The inner frame injection molding racket according to claim 1, characterized in that: The racket head frame (1) is made of aluminum alloy and has a hollow structure inside.

3. The inner frame injection molding racket according to claim 1, characterized in that: The T-shaped tee (21) of the connecting piece (2) used to connect the racket head frame (1) and the middle rod (3) is replaced by a filler welding method.

4. The inner frame injection molding racket according to claim 1, characterized in that: The handle (4) is integrally formed by injection molding, and the handle (4) is a hollow structure.

5. A method for manufacturing an internal skeleton injection-molded racket according to any one of claims 1 to 4, characterized in that: The steps include: Step 1: placing the rounded racket head frame (1) on a punching machine for punching; Step 2: Use a T-shaped tee (21) or filler welding to connect and fix the racket head frame (1) and the middle rod (3); Step 3: placing the connected and fixed racket head frame (1) and the middle rod (3) on an injection molding machine for injection molding, thereby forming a racket handle (4) that wraps the racket head frame (1) and the middle rod (3) and is integrally molded.

6. The method for manufacturing an inner frame injection-molded racket according to claim 5, characterized in that: After the injection molding in step three, a handle (4) is formed at the lower end of the middle rod (3).

7. The method for manufacturing an inner frame injection-molded racket according to claim 5, characterized in that: After the injection molding in step three, a wire protection nail is formed at each center seam hole (16).

8. The method for manufacturing an inner frame injection-molded racket according to claim 6, characterized in that: In the step 3, carbon powder and fiber are added during the injection molding process.

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