CN212067648U - Badminton racket frame reaches racket including it - Google Patents

Abstract

The utility model provides a badminton racket frame and a badminton racket comprising the same, which is provided with a hollow tubular structure, wherein the pipe wall of the tubular structure is composed of a plurality of layers of layered structures, each layered structure comprises at least three carbon fiber layers and at least two layers of PMI films, the inner side and the outer side of each layer of PMI film are carbon fiber layers, and the basal layer and the skin layer of the pipe wall are carbon fiber layers; the badminton racket frame comprises a handle and a net frame which are connected, and the handle and/or the net frame comprise tubular structures. In the pipe wall of the tubular structure, the PMI film plays a role in supporting and reinforcing the carbon fiber layer, so that the tubular structure has high tensile resistance, pressure resistance, specific rigidity, specific strength and corrosion resistance. Therefore, the badminton racket frame has high mechanical strength and toughness, can resist and buffer large impact force of hitting a badminton, and is not easy to break. On the other hand, the tubular structure is made of carbon fibers and PMI and is provided with a hollow inner cavity, so that the racket body of the badminton racket is light and handy, and production materials of the racket body can be saved.

Description

Badminton racket frame reaches racket including it

Technical Field

The utility model belongs to the sport equipment field specifically, relates to a badminton racket frame reaches racket including it.

Background

Along with the increasing living standard of people, people pay more and more attention to their health, and people's body-building is more and more common. Badminton is a favorite activity of the public, badminton rackets are indispensable sports equipment in the badminton process, and the performance of the badminton rackets determines the sports quality. At present, a badminton racket is generally composed of a handle and a net frame which are connected, and the material of the badminton racket is generally wood or metal. Wooden badminton racket is lighter, but its compressive strength is low, easily breaks, and the shock-absorbing capacity is relatively poor when catching the ball. The compression strength of the metal badminton racket is relatively strong, but the racket body is heavy, the buffering performance is not good, and the wrist is easy to be injured by shocks. With the development of science and technology, the research and development and the manufacture of the badminton racket develop towards the direction that the racket body is lighter, the compression resistance is stronger, the mechanical strength is higher and higher, and the toughness is better and better.

The carbon fiber is a special fiber consisting of carbon elements and has the characteristics of high temperature resistance, friction resistance, electric conduction, heat conduction, corrosion resistance and the like. The carbon fiber is fibrous and soft, and may be produced into various kinds of fabric, and has graphite microcrystal structure with preferred orientation along fiber axis and thus high strength and modulus along fiber axis direction. The carbon fibers have a low density and thus a high specific strength and a high specific modulus. In the prior art, the main purpose of carbon fiber is to compound carbon fiber with foam, resin, metal, ceramic, carbon and the like as a reinforcing material to manufacture advanced composite materials.

Polymethacrylimide foam (PMI) is a cross-linked foam with a uniform pore size distribution, excellent structural stability and high mechanical strength. PMI has higher specific strength, specific modulus, heat and humidity resistance, and better high temperature creep resistance and dimensional stability than other polymer foam materials. PMI is the foam material with the highest specific strength (strength/density) and specific modulus (modulus/density) in the world at present, has excellent high-temperature resistance and dimensional stability, and is an ideal core material for manufacturing the light-weight high-strength composite material pipe wall. In addition, because the PMI has high closed pore rate, uniform pore size distribution and low moisture absorption rate, the sandwich composite material as the core material has durability and environmental resistance which are far superior to those of a honeycomb composite material.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a badminton racket frame reaches racket including it to improve racket's toughness, compressive capacity, mechanical strength.

According to an aspect of the utility model, a badminton racket frame is provided, which has a hollow tubular structure, the pipe wall of the tubular structure is composed of a plurality of layers of layered structures, each layered structure comprises at least three carbon fiber layers and at least two layers of PMI films, the inner side and the outer side of each layer of PMI film are carbon fiber layers, and the basal layer and the skin layer of the pipe wall are carbon fiber layers; the badminton racket frame comprises a handle and a net frame which are connected, and the handle and/or the net frame comprise tubular structures.

All hollow bodies with hollow cavities all belong to the tubular structure of the utility model. In the pipe wall of the tubular structure, the PMI film and the carbon fiber layer are compounded to form a multilayer sandwich structure, the PMI film with excellent mechanical property plays a role in supporting and reinforcing the carbon fiber layer, so that the tubular structure has high tensile resistance, pressure resistance, specific rigidity, specific strength and corrosion resistance. On the other hand, the material of tubular structure is carbon fiber and PMI to have hollow inner chamber, can enough make the bat body of racket keep light and handy, the nimble use of convenient to use person can save the production material of pole body again, avoids racket's cost too high.

Preferably, the PMI film is made of 100% PMI.

Preferably, the thickness of the PMI film does not exceed 1 mm.

The PMI film with the thickness not more than 1mm has certain crimpability at normal temperature, and the PMI film is used as a core layer material for preparing the pipe wall, so that the PMI film can be directly compounded outside the base material in a manner of being attached to the outline of the base material, and the badminton racket frame can be conveniently manufactured in batches. In addition, compared with the compounding between thick plates, the compounding of the thin layers has larger interlayer binding force, the interlayer binding is tighter, the delamination is not easy, and the integration and the mechanical property of the badminton racket frame are improved. In the pipe wall of tubular structure, the thickness of every layer of PMI membrane accounts for less, consequently, can adopt the compound form of multilayer PMI membrane to make the bat body have bigger mechanical strength, simultaneously, can not make the external diameter of the handle of bat body obviously increase, can make the size of the external diameter adaptation human hand type of handle, reach more comfortable use and experience.

Preferably, the PMI film is directly coated on the periphery of the carbon fiber layer on the inner side of the PMI film.

Preferably, the PMI film is spirally wound around the outer periphery of the carbon fiber layer on the inner side thereof.

Optionally, the texture of the carbon fiber layer is helical.

The appearance of the badminton racket frame generally comprises special-shaped structures such as arc sections, corners and gradually-changed outer diameters, so that materials for constructing the layered structure form the layered structure in a spiral winding mode, the layered structure can meet the manufacturing requirements of the badminton racket frame, all the layered structures forming the tube wall can be tightly compounded with each other, and dead corners or gaps do not exist.

Optionally, the grains of two adjacent layers of the layered structure are mutually crossed. Therefore, the adjacent layered structures jointly form a staggered net-shaped structure, the net-shaped structure is uniformly stressed, and the compression resistance of the badminton racket frame can be improved.

Preferably, the net frame is formed by a tubular structure, and comprises a supplement part and a main frame part connected with the handle; the main frame part is of an open-loop structure, and the two ends of the complement part are respectively connected with the two ends of the main frame part in a one-to-one correspondence manner. The interval formed between the two ends of the main frame part is used as an opening ring opening of the main frame part, and the opening ring opening is used as a demoulding outlet of the main frame part, so that demoulding operation in the process of manufacturing the main frame part is facilitated.

Preferably, the grip is formed of a tubular structure, the grip including a grip rod, a first connecting portion and a second connecting portion; one end of the two ends of the handle rod, which is close to the screen frame, is taken as a first end part of the handle rod, and the two ends of the first connecting part and the second connecting part are respectively connected with the first end part and the main frame part; the complement part is positioned between the joint of the first connecting part and the main frame part and the joint of the second connecting part and the main frame part. The first connecting part and the second connecting part are used as parts for connecting the handle and the main frame part, so that the connection between the handle and the main frame part can be reinforced, the hitting pressure and the swing acting force are uniformly borne by the badminton racket frame through the transmission of the first connecting part and the second connecting part, and the joint of the handle and the net frame is not easy to break.

Preferably, both ends of the first connecting part are respectively connected with the handle rod and the main frame part in an integrated forming way; both ends of the second connecting part are respectively connected with the handle rod and the main frame part in an integrated forming way. That is to say, the joints among the grip lever, the first connecting part, the second connecting part and the main frame part are all provided with no gaps, so that stress concentration caused by the formation of the gaps is avoided, the joints of the parts have higher mechanical strength, and the parts are not easy to break.

Preferably, one end of the two ends of the grip rod, which is far away from the screen frame, is taken as a second end part of the grip rod, the grip rod is in a conical shape, and the inner diameter of the grip rod gradually decreases along the direction from the second end part to the first end part. During production, the tube core mold of the grip is released from the second end of the holding rod, the holding rod is in a conical shape, and the inner diameter of the holding rod gradually decreases, so that the grip is convenient to release.

According to another aspect of the present invention, there is provided a badminton racket, comprising the badminton racket frame as described above. The badminton racket has high mechanical strength and toughness, can resist and buffer large hitting impact force, is not easy to break, can achieve longer service life, and can reduce the probability of wrist damage caused by hitting impact force.

Drawings

FIG. 1 is a layered structure diagram of the wall of a tubular structure;

FIG. 2 is a schematic view of the structure of a composite mold used in example 1;

FIG. 3 is a schematic structural view of the integrally formed grip and the main frame;

FIG. 4 is a schematic view of a complementary structure;

FIG. 5 is a schematic perspective view of a racquet frame made in accordance with example 1;

FIG. 6 is a left side view of a racquet frame made according to example 1.

The correspondence of each reference numeral in the above figure is as follows: the manufacturing method comprises the following steps of 1, a PMI film layer, 2, a carbon fiber layer, 3, a handle, 31, a handle rod, 32, a first connecting portion, 33, a second connecting portion, 4, a net frame, 41, a main frame portion, 42, a completion portion, 51, a first handle mold, 52, a second handle mold, 53, a first net frame mold, and 54, a second net frame mold.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, back, horizontal, vertical … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly. In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.

Example 1

The badminton racket of the embodiment consists of a badminton racket frame and a net wire; wherein, the badminton racket frame consists of a handle 3 and a net frame 4; specifically, the grip 3 is composed of a grip rod 31, a first connecting portion 32 and a second connecting portion 33, and the net frame 4 is a closed loop structure composed of a main frame portion 41 and a supplement portion 42. In the above-described structure, the grip 3 and the main frame portion 41 are integrally molded, and therefore, the grip 3 and the main frame portion 41 are manufactured in the same molding step in the production process. In the molding process of the grip 3 and the main frame portion 41, a combined mold including a first grip mold 51, a second grip mold 52, a first frame mold 53, and a second frame mold 54 as shown in fig. 2 is required. The appearance of the first handle mold 51 and the second handle mold 52 are mirror symmetry to each other, and the first handle mold 51 and the second handle mold 52 both comprise a front section and a rear section which are connected: the rear sections are all conical cylinders with semicircular cross sections, the vertical wall surface in the outer wall of the rear half section along the length direction of the rear half section is used as a splicing surface of a first grip mold 51 and a second grip mold 52, and the size of the outer diameter of the semicircular cross section is reduced along the front end to the rear end of the conical cylinder; the front section is arc-shaped and extends in a direction away from the joining surface of the first grip mold 51 and the second grip mold 52. After the first handle mold 51 and the second handle mold 52 are spliced, the rear sections of the two are combined into a conical cylinder shape with a circular cross section and an outer diameter of the cross section gradually decreasing from the front end to the rear end, and the front sections of the two are mirror-symmetrical about the splicing surface of the two. The first frame die 53 and the second frame die 54 are mirror-symmetrical to each other, and the first frame die 53 and the second frame die 54 are assembled to form an oval open-loop structure with a notch. Respectively combining a first grip mould 51 with a second grip mould 52, combining a first net frame mould 53 with a second net frame mould 54, then combining the front section of the first grip mould 51 with the first net frame mould 53, combining the front section of the second grip mould 52 with the second net frame mould 54, and enabling a gap between the first grip mould 53 and the second net frame mould 54 to be positioned between the joint of the first grip mould 51 and the first net frame mould 53 and the joint of the second grip mould 52 and the second net frame mould 54.

1. Manufacture of the grip 3 and the main frame portion 41

S1, adopting the combined die shown in FIG. 2 as a tube core die, coating a release agent on the surface of the tube core die, attaching the surface of the tube core die, and winding the tube core die by using carbon fibers to construct a first carbon fiber layer 2 serving as a substrate layer of a tube wall;

s2. extension of sandwich structure

S2.1, coating resin on the surface of a carbon fiber layer 2 serving as a substrate layer, and winding the carbon fiber layer on the periphery of the substrate layer to construct 2 carbon fiber layers 2 on the periphery of the substrate layer;

s2.2, coating resin on the surface of the outermost carbon fiber layer 2 of the semi-finished product prepared in the previous step, adhering and winding a PMI film on the periphery of the carbon fiber layer 2, and constructing 1 PMI film layer 1 on the periphery of the outermost carbon fiber layer 2 of the semi-finished product, wherein the formed PMI film layer 1 has spiral lines;

s2.3, coating resin on the surface of the outermost PMI film layer 1 of the semi-finished product prepared in the previous step, and adhering and winding carbon fibers on the periphery of the PMI film layer 1, so that 1 carbon fiber layer 2 is built on the periphery of the semi-finished product;

s2.4 repeating S2.2-S2.3 three times;

s3, coating resin on the surface of the outermost carbon fiber layer 2 of the semi-finished product prepared in the previous step, attaching carbon fibers and winding the carbon fibers on the periphery of the semi-finished product, and thus constructing 1 carbon fiber layer 2 on the periphery of the semi-finished product to serve as a skin layer of a pipe wall;

s4, ultraviolet irradiation is carried out to crosslink and solidify the resin which is adhered to each layered structure so as to shape the pipe wall, and in some embodiments, the resin can be crosslinked and solidified in a heating mode so as to obtain a molded body of the grip 3 and the main frame part 41;

s5, demolding

S5.1 in the molded body, taking one end of the two ends of the handle rod 31 far away from the net frame 4 as a second end part of the handle rod 31, firstly pulling out a first handle mold 51 from the second end part of the handle 3, and then pulling out a second handle mold 52 from the second end part of the handle 3;

s5.2 in the molded article, the first frame mold 53 is drawn out from the open loop opening of the main frame portion 41 with the interval formed at both ends of the main frame portion 41 as the open loop opening, and then the second frame mold 54 is drawn out from the open loop opening.

In the finished product prepared by the above procedures, the angle formed by the lines of the adjacent two layers of layered structures is 45 degrees, and the thickness of the PMI film adopted is not more than 1 mm. The wall of the finished tube has a layered structure as shown in fig. 1. The structure of the finished product is schematically shown in figure 3: the handle 3 is composed of a handle rod 31, a first connecting part 32 and a second connecting part 33, the handle rod 31 is a conical cylinder with a circular cross section, the outer diameter of the cross section gradually decreases along the direction from the second end part to the first end part, the first connecting part 32 and the second connecting part 33 are both arc-shaped tubular structures, both are connected with the first end part of the handle rod 31, and both extend in the direction far away from the central axis of the handle rod 31; the main frame portion 41 has an elliptical open loop structure with an open loop opening, the open loop opening is symmetrical about a central axis of the main frame portion 41, the main frame portion 41 is respectively connected with the first connecting portion 32 and the second connecting portion 33, and the open loop opening is positioned between a connecting position between the first connecting portion 32 and the main frame portion 41 and a connecting position between the second connecting portion 33 and the main frame portion 41; the first and second connection portions 32 and 33 are symmetrical about the central axis of the grip lever 31 and the main frame portion 41. In the finished product, the handle bar 31, the first connecting portion 32, the second connecting portion 33 and the main frame portion 41 are integrally formed, and the joints of the components connected to each other have no gap.

2. Make the complement 42

S1, adopting an arc rod-shaped mold with a circular cross section as a tube core mold, coating a release agent on the surface of the tube core mold, attaching the surface of the tube core mold, and winding the tube core mold by using carbon fibers to construct a first carbon fiber layer 2 as a substrate layer of a tube wall;

s2. extension of sandwich structure

S2.1, coating resin on the surface of a carbon fiber layer 2 serving as a substrate layer, and winding the carbon fiber layer on the periphery of the substrate layer to construct 2 carbon fiber layers 2 on the periphery of the substrate layer;

s2.2, coating resin on the surface of the outermost carbon fiber layer 2 of the semi-finished product prepared in the previous step, adhering and winding a PMI film on the periphery of the carbon fiber layer 2, and constructing 1 PMI film layer 1 on the periphery of the outermost carbon fiber layer 2 of the semi-finished product, wherein the formed PMI film layer 1 has spiral lines;

s2.3, coating resin on the surface of the outermost PMI film layer 1 of the semi-finished product prepared in the previous step, and adhering and winding carbon fibers on the periphery of the PMI film layer 1, so that 1 carbon fiber layer 2 is built on the periphery of the semi-finished product;

s2.4 repeating S2.2-S2.3 three times;

s3, coating resin on the surface of the outermost carbon fiber layer 2 of the semi-finished product prepared in the previous step, attaching carbon fibers and winding the carbon fibers on the periphery of the semi-finished product, and thus constructing 1 carbon fiber layer 2 on the periphery of the semi-finished product to serve as a skin layer of a pipe wall;

s4, ultraviolet irradiation is carried out to enable the resin adhered with each layered structure to be crosslinked and cured, so that the tube wall is shaped, and in some embodiments, the resin can be crosslinked and cured in a heating mode;

and S5, removing the tube core mould to obtain a complete part 42 formed by compounding the PMI film and the carbon fibers.

In the method, the angle formed by the lines of the two adjacent layers of the layered structures is 45 degrees, and the thickness of the PMI film is not more than 1 mm. As shown in fig. 4, the thus-obtained supplement portion 42 is a hollow arc-shaped tubular structure (each of the pipes having the center of gravity outside the pipe body thereof and having no bent structure may be referred to as an arc-shaped tubular structure). The length of the supplement portion 42 is slightly longer than the open loop of the main frame portion 41, the curvature of the supplement portion 42 is adapted to the curvature of the main frame portion 41, and the outer diameter of the supplement portion 42 is equal to the inner diameter of the main frame portion 41.

3. Assembled badminton racket

The both ends of the supplement portion 42 are respectively inserted into the both ends of the main frame portion 41, and the supplement portion 42 is used for supplementing the open loop of the main frame portion 41, so that the supplement portion 42 and the main frame portion 41 jointly form a closed loop structure, the assembly of the badminton racket frame is completed, and the finished badminton racket frame is as shown in fig. 5 and 6. And arranging a positioning hole on the net frame 4 of the badminton racket frame, and installing the net strings on the net frame 4 through the positioning hole to obtain the badminton racket.

In practical applications, the number of layers and the thickness of the layered structure of the tube walls constituting the grip 3, the main frame portion 41, and the filling portion 42 may be adjusted as needed within appropriate ranges.

Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art will understand that the present invention can be modified or replaced with other embodiments without departing from the spirit and scope of the present invention.

Claims (10)

1. A badminton racket frame is characterized in that: the composite pipe is provided with a hollow tubular structure, the pipe wall of the tubular structure is composed of a plurality of layers of laminated structures, each laminated structure comprises at least three carbon fiber layers and at least two layers of PMI films, the carbon fiber layers are respectively arranged on the inner side and the outer side of each layer of PMI film, and the substrate layer and the skin layer of the pipe wall are both the carbon fiber layers;

the badminton racket frame comprises a handle and a net frame which are connected, and the handle and/or the net frame comprise the tubular structure.

2. A badminton racket frame according to claim 1, wherein: the PMI film was made of 100% PMI.

3. A badminton racket frame according to claim 2, wherein: the thickness of the PMI film is not more than 1 mm.

4. A badminton racket frame according to claim 3, wherein: the PMI film is directly coated on the periphery of the carbon fiber layer at the inner side of the PMI film.

5. A badminton racket frame according to claim 3, wherein: the PMI film is spirally wound around the outer periphery of the carbon fiber layer on the inner side thereof.

6. A badminton racket frame according to claim 1, wherein:

the net frame is composed of the tubular structure and comprises a supplement part and a main frame part connected with the handle; the main frame portion is of an open-loop structure, and two ends of the complement portion are correspondingly connected with two ends of the main frame portion one by one.

7. The racket frame of claim 6 further comprising:

the handle is formed by the tubular structure and comprises a handle rod, a first connecting part and a second connecting part;

one end of the two ends of the handle rod, which is close to the screen frame, is taken as a first end part of the handle rod, and two ends of the first connecting part and the second connecting part are respectively connected with the first end part and the main frame part;

the supplement portion is located between a joint of the first connecting portion and the main frame portion and a joint of the second connecting portion and the main frame portion.

8. A badminton racket frame as defined in claim 7, further comprising:

the two ends of the first connecting part are respectively connected with the handle rod and the main frame part in an integrated forming way;

the two ends of the second connecting part are respectively connected with the handle rod and the main frame part in an integrated forming mode.

9. A badminton racket frame as defined in claim 7, further comprising: and one end of the two ends of the handle rod, which is far away from the screen frame, is taken as a second end part of the handle rod, the handle rod is conical, and the inner diameter of the handle rod gradually decreases along the direction in which the second end part points to the first end part.

10. A badminton racket is characterized in that: comprising a racket frame according to any of the claims 1-9.

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