A reciprocating tubular blade set

Abstract

A reciprocating tubular blade assembly includes a moving blade and a stationary blade. The stationary blade includes a stationary blade body, and the moving blade includes a moving blade body. The stationary blade body extends tubularly to form a hollow receiving cavity. The moving blade body is located within the receiving cavity of the stationary blade body. The moving blade body has a moving blade shearing section with multiple spaced-apart moving blade tooth grooves, forming multiple moving blade teeth on the moving blade shearing section. The stationary blade body has a corresponding stationary blade shearing section with multiple spaced-apart stationary blade tooth grooves, forming multiple stationary blade teeth on the stationary blade body. The moving blade body or the stationary blade body is formed by any one of extrusion, stretching, or powder metallurgy die casting. The outer diameter of the moving blade body or the stationary blade body is ≤5mm. This tubular blade assembly can meet the requirements for shaving narrow areas, has a simple production process, is easy to form, has high production efficiency, and is more widely applicable.

Description

Technical Field

[0001] This utility model relates to personal care or medical shavers, and in particular to a compound tubular blade assembly and its processing method. Background Technology

[0002] With the continuous development of society and the improvement of people's living standards, individuals are paying more and more attention to their appearance. As a result, various types of shavers have emerged, among which reciprocating shavers are particularly popular. Existing reciprocating shaver heads mainly consist of a stationary blade and a moving blade. The stationary blade has a hair inlet for guiding hair, while the moving blade is fixed to a blade holder that is synchronously linked with the drive mechanism. The high-speed rotation of the drive mechanism causes the blade holder to oscillate back and forth, which in turn causes the moving blade to move horizontally back and forth along the stationary blade to achieve shaving. Current designs typically include a base and a blade holder that supports the stationary and moving blades. The base and blade holder are connected by a spring to form a floating connection. An additional component is needed to limit the movement of the blade holder relative to the base. The overall design is not simple enough and still needs improvement. Summary of the Invention

[0003] In view of this, the present invention provides a compound tubular blade assembly and a processing method thereof.

[0004] A reciprocating tubular blade assembly includes a moving blade and a stationary blade. The moving blade and the stationary blade work together to reciprocate and cut hair. The stationary blade includes a stationary blade body, and the moving blade includes a moving blade body. The stationary blade body extends in a tubular shape to form a hollow receiving cavity. The moving blade body is located within the receiving cavity of the stationary blade body. The moving blade body has a moving blade cutting section with multiple spaced-apart moving blade tooth grooves, forming multiple moving blade teeth on the moving blade cutting section. The stationary blade body has a stationary blade cutting section corresponding to the moving blade cutting section, with multiple spaced-apart stationary blade tooth grooves, forming multiple stationary blade teeth on the stationary blade body. The moving blade body or the stationary blade body is formed by any one of extrusion, stretching, or powder metallurgy die casting. The outer diameter of the moving blade body or the stationary blade body is ≤5mm.

[0005] Preferably, the outer surface of the stationary blade body where the stationary blade shearing section is located has at least a stationary blade protrusion that protrudes relative to the stationary blade body. The stationary blade protrusion causes protruding comb teeth to form on the stationary blade teeth. The comb teeth are either flush with or protruding relative to the stationary blade teeth in the radial direction.

[0006] Preferably, the radial difference between the comb teeth and the stationary blade teeth is ≤1mm.

[0007] Preferably, the surface of the stationary blade body where the stationary blade shearing section is located forms a local concave portion, and the comb teeth are located at the edge of the local concave portion.

[0008] Preferably, the thickness of the stationary cutter teeth at the local concave portion is ≤0.2mm.

[0009] Preferably, the local concave portion ensures that the surfaces of the stationary cutting teeth at that location are on the same horizontal plane, and the thickness of the stationary cutting teeth at the local concave portion is thinnest in the middle, while the thickness of the cutting teeth gradually increases from the middle to both sides.

[0010] Preferably, the stationary blade protrusions are symmetrically formed on the surface of the stationary blade body. When the stationary blade shearing part is placed upwards, the height of the comb teeth is lower than the height of the stationary blade teeth or is flush with the height of the stationary blade teeth.

[0011] Preferably, the radial clearance between the moving cutter tooth and the stationary cutter tooth is ≤0.05mm.

[0012] Preferably, the outer wall of the moving blade body or the inner wall of the stationary blade body is partially recessed, so that a gap is formed between the stationary blade body and the moving blade body corresponding to the recessed area.

[0013] Preferably, the moving blade body is provided with a moving blade deburring opening on the side opposite to the moving blade shearing part, and the stationary blade body is provided with a stationary blade deburring opening on the side opposite to the stationary blade shearing part, and the moving blade deburring opening and the stationary blade deburring opening at least partially overlap.

[0014] Preferably, the comb teeth protrude in an arc shape, and the arc-shaped edges of the comb teeth smoothly transition into the stationary blade body.

[0015] Preferably, the moving blade body or the stationary blade body forms a guide groove, and a rolling element is provided in the guide groove.

[0016] Preferably, the reciprocating tubular blade assembly further includes a fixed frame and a moving blade holder. The fixed frame is connected to the stationary blade body, and the moving blade holder is connected to the moving blade body and can drive the moving blade body to reciprocate relative to the fixed frame.

[0017] Preferably, the fixing frame includes an upper seat, a base, and a guide sleeve assembly located between the upper seat and the base. The upper seat is connected to the stationary tool body. The guide sleeve assembly includes two bushings disposed on the base and two fixed shafts disposed on the upper seat. The fixed shafts extend into the corresponding bushings. One end of the fixed shaft that mates with the bushing protrudes radially to form a limiting protrusion. The bushing forms a limiting groove with a size larger than the bushing hole diameter at the corresponding limiting protrusion. The shape of the limiting protrusion matches the limiting groove.

[0018] Preferably, the limiting protrusion is hemispherical, conical, cylindrical, or truncated conical.

[0019] Preferably, an elastic element is supported between the bottom wall of the bushing and the limiting protrusion, and the fixed shaft can move up and down relative to the bushing under the action of the elastic element.

[0020] Preferably, the upper seat is made of plastic or metal, and the upper seat and the stationary knife body are integrally formed or formed by secondary injection molding.

[0021] The above-mentioned reciprocating tubular blade assembly is processed using the following steps:

[0022] E1. Mold manufacturing: Select a tubular moving cutter or a tubular stationary cutter, design an extrusion molding mold according to the shape requirements, and manufacture the molding core;

[0023] E2. Material preparation: Prepare metal billets, including stainless steel;

[0024] E3. Making the blank body of moving or stationary blades: Heat the raw material to 1100℃-1250℃, and complete the conventional tubular forming by extrusion or bending using the forming mold core;

[0025] E4. Hardening process: The hardening process is completed by quenching and tempering using heat treatment equipment to achieve the standard hardness requirement for static tooling; quenching temperature 950℃-1100℃, time 1-4 minutes; low temperature tempering temperature 150℃-300℃, time 1-2 hours; hardness 45HRC-65HRC.

[0026] E5. Precision machining of external length, square hole and keyway: Precision segmentation and forming of stationary tool length, external wall square hole and keyway are carried out by using precision cutting equipment;

[0027] E6. Surface roughing treatment: Polishing and grinding equipment is used to polish and grind the outer wall of the stationary cutter with abrasive to achieve the standard roughness of the outer wall of the stationary cutter.

[0028] E7. Tooth profile forming: Precision tooth-making equipment is used to perform tooth-making on the outer wall of the stationary tool by using forming tools;

[0029] E8. Surface finishing: Polishing and grinding equipment is used to perform fine polishing and grinding on the outer wall of the stationary blade using fine abrasives to improve the feel and smoothness of the blade teeth.

[0030] E9. Inner wall finishing: The inner wall grinding and polishing equipment is used to perform fine grinding on the toothed cutting edge of the stationary knife by using a special grinding head or abrasive. This improves the regularity of the cutting edge on both sides of the inner wall tooth, and improves the flatness and smoothness of the inner wall, making it fit more stably with the tubular moving knife and meeting the performance design requirements of the stationary knife.

[0031] E10. Cleaning and Inspection: Clean the stationary tool after the inner wall has been finely ground and inspect all controlled dimensions.

[0032] Preferably, when the tubular stationary cutter selected in step E1 does not have a stationary cutter protrusion, the step also includes a step E0 located between E3 and E5, which involves processing the outer wall protrusion: selecting a material of a suitable shape and fixing it to the outer surface of the stationary cutter by welding to form the stationary cutter protrusion, or removing the material by grinding, wire cutting, or milling to form a depression, with the edges of the relatively depressed parts being relatively protruding to form the stationary cutter protrusion.

[0033] Preferably, the forming die in E1 is an extrusion forming die or a bending forming die.

[0034] This utility model also provides another processing method for the above-mentioned reciprocating tubular blade assembly, wherein the moving blade or stationary blade is processed using the following steps:

[0035] H1. Mold making: Select any type of tubular stationary cutter or tubular moving cutter, design the forming mold according to the shape requirements, and make the forming mold core;

[0036] H2. Preparation materials: Powder materials including martensitic stainless steel are selected as raw materials for processing;

[0037] H3. Making the blank body of the stationary or moving blade: Inject the metal powder raw material into the forming mold core, and use extrusion equipment to complete the tubular forming through the extrusion mold;

[0038] H4. Hardening Process: Sintering, quenching, and tempering are performed using heat treatment equipment to achieve the required hardness for the stationary or moving tool. Sintering temperature: 1120℃-1350℃, sintering time: 60-180 minutes; Quenching temperature: 820℃-900℃, quenching time: 15-30 minutes; Tempering temperature: 180℃-250℃, tempering time: 60-180 minutes. H5. Precision Machining of Length: Precision cutting equipment is used to precisely segment and shape the length of the stationary or moving tool.

[0039] H6. Precision machining of square holes and keyways: High-precision grinding equipment and forming molds are used to perform precision grinding and forming of the outer wall of the stationary tool or the outer wall of the moving tool.

[0040] H7. Surface roughing treatment: Polishing and grinding equipment is used to polish and grind the outer wall of the stationary tool or the moving tool by using abrasive to make the roughness of the outer wall of the stationary tool or the moving tool meet the standard requirements;

[0041] H8. Tooth profile forming: Precision tooth forming equipment is used to perform tooth cutting on the outer wall of the stationary tool or the outer wall of the moving tool by using forming tools;

[0042] H9. Surface finishing: Polishing and grinding equipment is used to perform fine polishing and grinding on the outer wall of the stationary cutter or the outer wall of the moving cutter using fine abrasives to improve the feel of the stationary cutter teeth and the external smoothness.

[0043] H10. Inner wall finishing: The inner wall grinding and polishing equipment uses a special grinding head or abrasive to perform fine grinding on the inner wall of the stationary cutter or the inner wall of the moving cutter. This improves the regularity of the cutting edges on both sides of the inner wall teeth, improves the flatness and smoothness of the inner wall, and makes the tubular stationary cutter and the tubular moving cutter fit more stably, so as to meet the performance design requirements of the stationary cutter and the moving cutter.

[0044] H11. Cleaning and Inspection: Clean the stationary or moving tools that have completed the fine grinding of the inner wall and inspect all controlled dimensions.

[0045] The beneficial effects of this utility model are as follows: the tubular blade assembly can meet the requirements of shaving in narrow areas, the production process is simple, the molding is convenient, the production efficiency is high, and the applicability is wider; when the razor shaves some wrinkles and depressions, it can effectively comb the hair, avoid the accumulation and jamming of messy hair during cutting, and avoid the razor jumping phenomenon during use. At the same time, the hair can quickly enter and cut, significantly reducing the temperature rise and improving the comfort of use; when the protrusion extends into the flexible groove, it is difficult to get out due to the restriction of the groove opening. This structure can quickly complete the installation of the blade assembly and the fixing frame; and this structure does not require the setting of other components to limit the floating between the upper seat and the base, making the structural design simpler; the ball bearings transform the sliding friction between the moving blade and the stationary blade into rolling friction. Under the frictional resistance, the frictional contact area is small, the temperature rise caused by friction is low, the frictional current is small, which helps the heat dissipation of the blade assembly and improves the service life of the razor. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0047] Appendix Figure 1 A perspective view of the stationary blade of the reciprocating tubular blade assembly;

[0048] Appendix Figure 2 for Figure 1 A three-dimensional view of the central static knife from another direction;

[0049] Appendix Figure 3 A perspective view of the moving blade of the reciprocating tubular blade assembly;

[0050] Appendix Figure 4 for Figure 3 A three-dimensional view of the middle-moving knife from another direction;

[0051] Appendix Figure 5 This is a structural diagram of the assembled moving and stationary tools;

[0052] Appendix Figure 6 For along Figure 5 A cross-sectional view along the AA direction;

[0053] Appendix Figure 7 A cross-sectional view of another type of assembly of moving and stationary tools;

[0054] Appendix Figure 8 A cross-sectional view of another type of assembly of moving and stationary tools;

[0055] Appendix Figure 9 A perspective view of a reciprocating tubular blade assembly shows that the moving blade body is equipped with a guide groove;

[0056] Appendix Figure 10 A perspective view of a reciprocating tubular blade assembly, showing that ball bearings are installed in the guide groove;

[0057] Appendix Figure 11 A perspective view of a reciprocating tubular blade assembly shows that the stationary blade body is equipped with a guide groove;

[0058] Appendix Figure 12 A perspective view of the reciprocating tubular blade assembly shows that both the moving blade body and the stationary blade body are equipped with guide grooves;

[0059] Appendix Figure 13 This is a top view of the reciprocating tubular blade assembly;

[0060] Appendix Figure 14 For along Figure 13 A three-dimensional view cut along the middle BB direction;

[0061] Appendix Figure 15 An exploded perspective view of a reciprocating tubular blade assembly;

[0062] Appendix Figure 16 An exploded perspective view of another type of reciprocating tubular blade assembly;

[0063] Appendix Figure 17 An exploded perspective view of another type of reciprocating tubular blade assembly;

[0064] Appendix Figure 18 An exploded perspective view of another type of reciprocating tubular blade assembly;

[0065] Appendix Figure 19 This is a partial sectional view showing the fit between the bushing and the fixed shaft;

[0066] Appendix Figure 20 This is a structural diagram of the assembled moving and stationary tools;

[0067] Appendix Figure 21For the appendix Figure 20 A cross-sectional view along a radial direction;

[0068] Appendix Figure 22 This is a cross-sectional view of the moving and stationary tools assembled in another manner, with a gap between them.

[0069] Figure label:

[0070] 1. Moving blade, 2. Stationary blade, 3. Moving blade body, 4. Stationary blade body, 5. Receiving cavity, 6. Moving blade shearing part, 7. Moving blade tooth groove, 8. Moving blade tooth, 9. Stationary blade shearing part, 10. Stationary blade tooth groove, 11. Stationary blade tooth, 12. Stationary blade protrusion, 13. Comb tooth, 14. Partial concave part, 15. Gap, 16. Moving blade hair removal opening, 17. Stationary blade hair removal opening, 18. Guide groove, 19. Ball bearing, 20. Rib, 21. Fixing frame, 22. Moving blade seat, 23. Upper seat, 24. Base, 25. Guide sleeve assembly, 26. Bushing, 27. Fixed shaft, 28. Limiting protrusion, 29. Limiting groove, 30. Bottom wall, 31. Elastic element, 32. Connecting seat, 33. Limiting structure, 34. Connecting arm. Detailed Implementation

[0071] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0072] The present invention will now be further described with reference to the accompanying drawings.

[0073] This utility model provides the following technical solution:

[0074] As attached Figure 1-22As shown, this utility model discloses a reciprocating tubular blade assembly, including a moving blade 1 and a stationary blade 2. The moving blade 1 and the stationary blade 2 work together to reciprocate and cut hair. The stationary blade 2 includes a stationary blade body 4, and the moving blade 1 includes a moving blade body 3. The stationary blade body 4 extends in a tubular shape to form a hollow receiving cavity 5, and the moving blade body 3 is located within the receiving cavity 5 of the stationary blade body 4. The moving blade body 3 has a moving blade cutting section 6, which is provided with multiple spaced moving blade tooth grooves 7 to form multiple moving blade teeth 8. The stationary blade body 4 is provided with a stationary blade cutting section 9 corresponding to the moving blade cutting section 6, which is provided with multiple spaced stationary blade tooth grooves 10 to form multiple stationary blade teeth 11. The moving blade body or the stationary blade body can be formed by any of the following methods: extrusion, stretching, or powder metallurgy die casting. The outer diameter of the moving blade body or the stationary blade body is ≤5mm. The above-formed tubular blade assembly can meet the requirements for shaving narrow areas. The production process is simple, the forming is convenient, the production efficiency is high, and the applicability is wider.

[0075] The outer surface of the static blade body 4, where the static blade cutting section 9 is located, has at least a portion of a static blade protrusion 12 that protrudes relative to the static blade body 4. This static blade protrusion 12 causes protruding comb teeth 13 to form on the static blade teeth 11, with the comb teeth 13 protruding radially relative to the static blade teeth 11. By providing the static blade protrusion 12 on the tubular static blade body 4, when the shaver is shaving some wrinkled or recessed areas, the static blade protrusion 12 can effectively comb the hair, preventing tangled hair from accumulating and getting stuck during cutting, thus preventing the shaver from skipping during use. Simultaneously, the hair can quickly enter and be cut, significantly reducing temperature rise and improving user comfort. Preferably, the radial difference between the comb teeth 13 and the static blade teeth 11 is ≤1mm, which can guide the hair to a certain extent without being too protruding and affecting the hair's entry into the tooth groove.

[0076] Specifically, the starting point and ending point of the moving blade groove 7 can be located on the same horizontal line. That is, when the moving blade shearing part 6 is placed upwards, the moving blade groove 7 is located in the middle of the moving blade body 3. Of course, the starting point and ending point of the moving blade groove 7 can also not be located on the same horizontal line, but form a pattern where one side has a higher starting point and the other side has a lower ending point. That is, in this case, when the moving blade shearing part 6 is placed upwards, the moving blade groove 7 is not located in the middle of the moving blade body 3. Similarly, the stationary blade groove 10 can also adopt the above-described form.

[0077] Preferred, such as Figure 8As shown, a partial recess 14 is formed on the surface of the stationary blade body 4 where the stationary blade cutting section 9 is located. The partial recess 14 extends from one end of the stationary blade body 4 to the other end. The comb teeth 13 are located at the two edges in the width direction of the partial recess 14. The thickness of the stationary blade teeth 11 at the partial recess 14 is ≤0.2mm. With this configuration, the comb teeth 13 can be used to comb the messy hair in the folded area. At the same time, because of the partial recess 14, the thickness of the stationary blade teeth at this location is thinner, enabling the removal of shorter hairs and resulting in cleaner hair removal.

[0078] It is easily understood that when the local recess 14 extends horizontally, the surfaces of the stationary cutting teeth 11 at that location are on the same horizontal plane. The thickness of the stationary cutting teeth 11 at the local recess 14 is thinnest in the middle, and the thickness gradually increases from the middle to the sides. Figure 8 As shown, the stationary blade 11 corresponding to the local concave area is thinnest in the middle, and the comb teeth 13 increase in thickness from the middle to both sides. This design allows for the cutting of shorter hairs using the middle section. At the same time, the increasing thickness from the middle to both sides further increases the overall rigidity of the stationary blade 11, improving structural stability and preventing shaking or skipping of the blades due to their thinness. This enhances the stability of the shaver, significantly reduces temperature rise, and improves user comfort.

[0079] Two stationary blade protrusions 12 are provided and symmetrically formed on the surface of the stationary blade body 4. When the stationary blade shearing part 9 is placed upwards, the height of the comb teeth 13 is slightly lower than the height of the stationary blade teeth 11 (see attached figure). Figure 6 Or it can be flush with the height of the stationary blade tooth 11 (see attached). Figure 8 With this configuration, when the hair is cut by the blades between the two stationary blade protrusions 12 and the stationary blade cutting section 9, the presence of the comb teeth 13 will not prevent the hair from being removed. This ensures that this part of the stationary blade cutting section 9 can serve as the main cutting area to remove hair, thus guaranteeing cutting efficiency.

[0080] Preferably, the radial clearance between the moving blade 8 and the stationary blade 11 is ≤0.05mm. Since the diameter of hair is generally less than 0.05mm, this setting ensures that the hair is cut smoothly, improving cutting efficiency.

[0081] like Figure 22 As shown, a partial recess can also be formed on the outer wall of the moving blade body 3 or the inner wall of the stationary blade body 4, creating a gap 15 between the stationary blade body 4 and the moving blade body 3 corresponding to the recessed area. (See attached diagram) Figure 22Therefore, a localized recess is formed on the outer wall of the moving blade body 3, thereby creating a gap 15 at the corresponding location. The shape of the localized recess is not limited, as long as a gap 15 can be formed between the stationary blade body 4 and the moving blade body 3. Of course, the gap is formed in a portion outside the main cutting area. The formation of the gap 15 reduces the friction surface between the moving and stationary blades, thereby reducing unnecessary current waste. This also eliminates unnecessary cutting surfaces, thereby increasing the machine's operating time and reducing blade friction temperature.

[0082] like Figure 2 , 4 As shown, a moving blade hair removal port 16 is provided on the side of the moving blade body 3 opposite to the moving blade shearing part 6, and a stationary blade hair removal port 17 is provided on the side of the stationary blade body 4 opposite to the stationary blade shearing part 9. The moving blade hair removal port 16 and the stationary blade hair removal port 17 at least partially overlap. The hair removal port facilitates hair removal, avoids hair accumulation, improves shearing efficiency, and effectively reduces the friction surface between the moving and stationary blades, thereby reducing unnecessary current waste, increasing machine working time, and reducing blade friction temperature.

[0083] like Figure 6 , 7 As shown in Figure 8, the comb teeth 13 protrude in an arc shape, and the arc-shaped edges of the comb teeth 13 smoothly transition into the stationary blade body 4. This design further improves the comfort of use, and the arc-shaped comb teeth 13 ensure minimal friction with the hair at any angle, facilitating the guidance of the hair for cutting and improving cutting efficiency.

[0084] See attached document Figure 9-19 The blade assembly also includes a fixing frame 21 and a moving blade holder 22. For example... Figure 14 As shown, the fixed frame 21 is connected to the stationary blade body 4, and the moving blade holder 22 is connected to the moving blade body 3 and can drive the moving blade body 3 to reciprocate relative to the fixed frame 21. Typically, the moving blade holder 22 has a rib 20 that cooperates with the moving blade, so that the two are connected.

[0085] like Figure 10-18 As shown, the moving blade body 3 and the stationary blade body 4 cooperate to form a guide groove 18, and a ball bearing 19 is disposed within the guide groove 18. Specifically, the guide groove 18 can be formed on the stationary blade body 4 and the moving blade body 3, or grooves can be provided on both the stationary blade body 4 and the moving blade body 3 to jointly define the guide groove 18. This structural design reduces the friction between the moving and stationary blades, making the sliding friction approximately equivalent to rolling friction, thereby reducing unnecessary current waste, increasing machine operating time, and reducing blade friction temperature.

[0086] like Figure 14-19As shown, the fixing frame 21 includes an upper seat 23, a base 24, and a guide sleeve assembly 25 located between the upper seat 23 and the base 24. The upper seat 23 is connected to the stationary tool body 4. The guide sleeve assembly 25 includes two bushings 26 disposed on the base 24 and two fixed shafts 27 disposed on the upper seat 23. The fixed shafts 27 extend into the corresponding bushings 26. One end of the fixed shaft 27 that mates with the bushing 26 protrudes radially to form a limiting protrusion 28. The bushing 26 forms a limiting groove 29 with a size larger than the bushing hole diameter at the corresponding limiting protrusion 28. The shapes of the limiting protrusion 28 and the limiting groove 29 are matched. The limiting protrusion 28 and the limiting groove 29 cooperate with each other to prevent the fixed shaft from detaching from the base.

[0087] like Figure 17 , 18 As shown, the upper seat 23 is also provided with a connecting seat 32, and the fixed shaft 27 is located below the connecting seat 32. Specifically, the upper seat 23 has two opposing walls that extend parallel to each other to define a guide groove between them. The upper seat 23 mainly guides and limits the movement of the moving tool holder 22 through the guide groove. The two walls of the upper seat 23 are connected at both ends to form an arch bridge shape and overlap the connecting seat 32. The connecting seat 32 is provided with a limiting structure 33, which limits the rolling of the ball 19 to prevent it from detaching from the guide groove 18. Specifically, the connecting seat 32 also includes a connecting arm 34, which extends from the connecting seat body, and the limiting structure 33 is provided on the connecting arm 34. Figure 17 , 18 The limiting structure 33 consists of two protruding structures formed on the connecting arm 34, with the positions of the two protruding structures corresponding to the two sides of the guide groove 18. These protruding structures at least partially block the two sides of the guide groove 18, thereby limiting the movement of the ball 19. In summary, the main purpose of this design is to prevent the ball 19 from detaching from the guide groove 18. Therefore, any design that can achieve this function conforms to the "limiting structure" defined in this application.

[0088] It is understood that, in specific implementation, the limiting structure 33 can be inserted into the guide groove 18 to form a guiding fit. As mentioned above, as shown in the attached... Figure 14 As shown, the linkage and guidance of the moving blade 1 have been achieved through the guide structure on the moving blade holder 22. In this application, the guiding and limiting of both ends of the moving blade 1 can be further realized. When the protrusion height of the limiting structure 33 is sufficient to extend into the guide groove 18, the limiting structure 33 can not only satisfy the limiting of the ball 19, but also form a further guiding and limiting of the movement of the moving blade 1, reducing the vibration of the moving blade 1 during movement, thereby reducing temperature rise and noise, and improving the service life of the shaver.

[0089] To facilitate connection with the fixed shaft 27, the upper end of the bushing 26 is surrounded by at least three flexible members to form the limiting groove 29. This arrangement facilitates assembly and prevents accidental disengagement by utilizing the mutual restraint between the limiting protrusion 28 and the limiting groove 29.

[0090] Preferably, the limiting protrusion 28 is hemispherical, conical, cylindrical, or truncated conical.

[0091] Preferably, an elastic element 31 is provided between the bottom wall 30 of the bushing 26 and the limiting protrusion 28, and the fixed shaft 27 can move up and down relative to the bushing 26 under the action of the elastic element 31.

[0092] Preferably, the upper seat 23 is made of plastic or metal, and the upper seat 23 and the stationary knife body 4 can be integrally formed or formed by secondary injection molding.

[0093] This utility model also provides a processing method for the above-mentioned reciprocating tubular blade assembly. In one embodiment, the moving blade or stationary blade is processed using the following steps:

[0094] E1. Mold manufacturing: Select a tubular moving cutter or a tubular stationary cutter, design an extrusion molding mold according to the shape requirements, and manufacture the molding core.

[0095] E2. Material preparation: Prepare metal billets, including stainless steel.

[0096] E3. Fabrication of the moving or stationary blade blank: The raw material is heated to 1100℃-1250℃, and conventional tubular forming is completed using the forming die through extrusion or bending. The heating temperature can be adjusted according to the material properties of different metals.

[0097] E4. Hardening Process: Hardening is achieved through quenching and tempering using heat treatment equipment to meet the hardness requirements for stationary or moving parts. Quenching temperature: 950℃-1100℃, time: 1-4 minutes; Low-temperature tempering temperature: 150℃-300℃, time: 1-2 hours; Hardness: 45HRC-65HRC. Low-temperature tempering can be performed using oil cooling, water cooling, or air cooling. The specific quenching and cooling times need to be adjusted based on the medium and material thickness.

[0098] E5. Precision machining of external length, square hole and keyway: Precision cutting equipment is used to precisely cut and segment the stationary tool length, external wall square hole and keyway.

[0099] E6. Surface roughing treatment: Polishing and grinding equipment is used to polish and grind the outer wall of the stationary cutter with abrasive to achieve the standard roughness requirements.

[0100] E7. Tooth profile forming: Precision tooth-making equipment is used to perform tooth-making on the outer wall of the stationary tool by using forming tools.

[0101] E8. Surface finishing: Polishing and grinding equipment is used to perform fine polishing and grinding on the outer wall of the stationary blade using fine abrasives to improve the feel and smoothness of the blade teeth.

[0102] E9. Inner wall finishing: The inner wall grinding and polishing equipment is used to perform fine grinding on the toothed cutting edge of the stationary knife by using a special grinding head or abrasive. This improves the regularity of the cutting edge on both sides of the inner wall tooth, and improves the flatness and smoothness of the inner wall, making it fit more stably with the tubular moving knife and meeting the performance design requirements of the stationary knife.

[0103] E10. Cleaning and Inspection: Clean the stationary tool after the inner wall has been finely ground and inspect all controlled dimensions.

[0104] Preferably, when the tubular stationary cutter selected in step E1 does not have a stationary cutter protrusion, the step also includes a step E0 located between E3 and E5, which involves processing the outer wall protrusion: selecting a material of a suitable shape and fixing it to the outer surface of the stationary cutter by welding to form the stationary cutter protrusion; or, the material on the outer surface of the stationary cutter can be removed by grinding, wire cutting, milling, etc., to form a depression, with the edge of the relatively depressed part being relatively protruding to form the stationary cutter protrusion.

[0105] Preferably, the forming die in E1 is an extrusion forming die or a bending forming die.

[0106] This utility model also provides another processing method for the above-mentioned reciprocating tubular blade assembly, wherein the moving blade or stationary blade is processed using the following steps:

[0107] H1. Mold Manufacturing: Select any type of tubular stationary cutter or tubular moving cutter, design the forming mold according to the shape requirements, and manufacture the forming mold core.

[0108] H2. Preparation Materials: Powdered materials, including martensitic stainless steel, are selected as raw materials for processing. Stainless steel grades such as 440C, 420, and 154CM can be selected.

[0109] H3. Fabrication of the stationary or moving blade blank: Metal powder raw material is injected into the forming die, and tubular forming is completed using extrusion equipment through the extrusion die. If using a room temperature extrusion (cold pressing) press, the pressure range is typically 550-830 MPa; if using hot pressing (high-temperature assisted pressing), the temperature is typically 100-120℃ (controlled below the softening temperature of stainless steel), and the pressure is reduced to 5-15 MPa. Standard speed: 1-5 mm / s, single pressing time: 5-30 seconds; if hot pressing, holding time: 10-60 seconds.

[0110] H4. Hardening Process: Sintering, quenching, and tempering are performed using heat treatment equipment to achieve the required hardness for either stationary or moving tools. Sintering temperature: 1120℃-1350℃, sintering time: 60-180 minutes; Quenching temperature: 820℃-900℃, quenching time: 15-30 minutes; Tempering temperature: 180℃-250℃, tempering time: 60-180 minutes.

[0111] H5. Precision machining of the outer length: Precision cutting equipment is used to precisely segment and shape the length of the stationary or moving blade.

[0112] H6. Precision machining of square holes and keyways: High-precision grinding equipment and forming molds are used to perform precision grinding and forming of the outer wall of the stationary tool or the outer wall of the moving tool.

[0113] H7. Surface roughing treatment: Polishing and grinding equipment is used to polish and grind the outer wall of the stationary tool or the moving tool by using abrasive to make the roughness of the outer wall of the stationary tool or the moving tool meet the standard requirements.

[0114] H8. Tooth profile machining: Precision tooth machining equipment is used to machine the teeth on the outer wall of the stationary tool or the outer wall of the moving tool by using forming tools.

[0115] H9. Surface finishing: Polishing and grinding equipment is used to perform fine polishing and grinding on the outer wall of the stationary cutter or the outer wall of the moving cutter using fine abrasives to improve the feel of the stationary cutter teeth and the surface finish.

[0116] H10. Inner wall finishing: The inner wall grinding and polishing equipment uses a special grinding head or abrasive to perform fine grinding on the inner wall of the stationary cutter or the inner wall of the moving cutter. This improves the regularity of the cutting edges on both sides of the inner wall teeth, improves the flatness and smoothness of the inner wall, and makes the tubular stationary cutter and the tubular moving cutter fit more stably, so as to meet the performance design requirements of the stationary cutter and the moving cutter.

[0117] H11. Cleaning and Inspection: Clean the stationary or moving tools that have completed the fine grinding of the inner wall and inspect all controlled dimensions.

[0118] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A reciprocating tubular blade assembly, comprising a moving blade and a stationary blade, wherein the moving blade and the stationary blade cooperate to reciprocate and cut hair, wherein the stationary blade comprises a stationary blade body, and the moving blade comprises a moving blade body, the stationary blade body extending in a tubular shape to form a hollow receiving cavity, the moving blade body being located within the receiving cavity of the stationary blade body, the moving blade body having a moving blade cutting section, the moving blade cutting section being provided with a plurality of spaced moving blade tooth grooves forming a plurality of moving blade teeth on the moving blade cutting section, the stationary blade body being provided with a stationary blade cutting section corresponding to the moving blade cutting section, the stationary blade cutting section being provided with a plurality of spaced stationary blade tooth grooves forming a plurality of stationary blade teeth on the stationary blade body, characterized in that: The forming method of the moving or stationary blade body is any one of extrusion, stretching, or powder metallurgy die casting, and the outer diameter of the moving or stationary blade body is ≤5mm.

2. The reciprocating tubular blade assembly according to claim 1, characterized in that: The outer surface of the stationary blade body where the stationary blade shearing section is located has at least a stationary blade protrusion that protrudes relative to the stationary blade body. The stationary blade protrusion causes protruding comb teeth to form on the stationary blade teeth. The comb teeth are either flush with or protruding relative to the stationary blade teeth in the radial direction.

3. The reciprocating tubular blade assembly according to claim 2, characterized in that: The radial difference between the comb teeth and the stationary blade teeth is ≤1mm.

4. The reciprocating tubular blade assembly according to claim 2, characterized in that: The surface of the stationary blade body where the stationary blade shearing section is located forms a local concave portion, and the comb teeth are located at the edge of the local concave portion.

5. The reciprocating tubular blade assembly according to claim 4, characterized in that: The thickness of the stationary cutter teeth at the local concave portion is ≤0.2mm.

6. The reciprocating tubular blade assembly according to claim 4, characterized in that: The local concave portion ensures that the surfaces of the stationary cutter teeth at that location are on the same horizontal plane. The thickness of the stationary cutter teeth at the corresponding local concave portion is thinnest in the middle and gradually increases from the middle to both sides.

7. The reciprocating tubular blade assembly according to claim 2, characterized in that: The stationary blade protrusions are symmetrically formed on the surface of the stationary blade body. When the stationary blade shearing part is placed upwards, the height of the comb teeth is lower than the height of the stationary blade teeth or is flush with the height of the stationary blade teeth.

8. The reciprocating tubular blade assembly according to any one of claims 1-4, characterized in that: The radial clearance between the moving cutter teeth and the stationary cutter teeth is ≤0.05mm.

9. The reciprocating tubular blade assembly according to any one of claims 1-4, characterized in that: The outer wall of the moving blade body or the inner wall of the stationary blade body is partially recessed, so that a gap is formed between the stationary blade body and the moving blade body corresponding to the recessed area.

10. The reciprocating tubular blade assembly according to claim 1, characterized in that: The moving blade body is provided with a moving blade deburring port on the side opposite to the moving blade shearing part, and the stationary blade body is provided with a stationary blade deburring port on the side opposite to the stationary blade shearing part. The moving blade deburring port and the stationary blade deburring port at least partially overlap.

11. The reciprocating tubular blade assembly according to claim 2, characterized in that: The comb teeth protrude in an arc shape, and the arc-shaped edges of the comb teeth smoothly transition into the stationary blade body.

12. The reciprocating tubular blade assembly according to claim 1, characterized in that: The moving blade body or the stationary blade body forms a guide groove, and a rolling element is provided in the guide groove.

13. The reciprocating tubular blade assembly according to claim 1, characterized in that: The reciprocating tubular blade assembly also includes a fixed frame and a moving blade holder. The fixed frame is connected to the stationary blade body, and the moving blade holder is connected to the moving blade body and can drive the moving blade body to reciprocate relative to the fixed frame.

14. The reciprocating tubular blade assembly according to claim 13, characterized in that: The fixing frame includes an upper seat, a base, and a guide sleeve assembly located between the upper seat and the base. The upper seat is connected to the stationary tool body. The guide sleeve assembly includes two bushings disposed on the base and two fixed shafts disposed on the upper seat. The fixed shafts extend into the corresponding bushings. One end of the fixed shaft that mates with the bushing protrudes radially to form a limiting protrusion. The bushing forms a limiting groove with a size larger than the bushing hole diameter at the corresponding limiting protrusion. The shape of the limiting protrusion matches the limiting groove.

15. The reciprocating tubular blade assembly according to claim 14, characterized in that: The limiting protrusion is hemispherical, conical, cylindrical, or truncated conical.

16. The reciprocating tubular blade assembly according to claim 14, characterized in that: An elastic element is supported between the bottom wall of the bushing and the limiting protrusion, and the fixed shaft can move up and down relative to the bushing under the action of the elastic element.

17. The reciprocating tubular blade assembly according to claim 14, characterized in that: The upper seat is made of plastic or metal, and the upper seat and the stationary knife body are integrally formed or formed by secondary injection molding.

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