Hair cutter

Abstract

The embodiment of the utility model discloses a hair cutter which comprises a shell, a motor, a sealing piece, a fixing base, a sleeve and a first transmission rod, the shell is provided with a mounting cavity and a through hole communicating with the mounting cavity, and the motor is arranged in the mounting cavity; the sealing piece is fixedly connected to the shell and covers the through hole, and the sealing piece is provided with a shaft hole; the fixing seat comprises a base and a connecting part which are connected with each other, the connecting part penetrates through the shaft hole and is tightly attached and fixed to the sealing piece, and the base is connected with the output end of the motor and can be driven by the motor to reciprocate; the sleeve is fixedly embedded in the connecting part, and the hardness of the sleeve is greater than that of the connecting part; the first transmission rod is fixedly installed in the sleeve. According to the hair cutter, the first transmission rod and the fixing base are connected more stably and are not prone to loosening.

Description

Technical Field

[0001] The present application relates to the technical field of hair trimming, and in particular to a hair cutter. Background Art

[0002] Common hair cutters include reciprocating shavers and hair trimmers. Current reciprocating hair cutters use a motor to drive a drive shaft back and forth, which in turn drives the blades to achieve cutting. To ensure a good seal, a sealing ring is typically positioned around the drive shaft. The folds in the sealing ring allow the motor's output to drive the drive shaft back and forth. However, current drive shafts are typically directly embedded in a fixed base connected to the motor's output. During operation, motor vibrations are transmitted to the connection between the drive shaft and the fixed base, making the connection between the drive shaft and the fixed base prone to loosening. This shortens the service life of the sealing ring and affects the waterproof seal of the connection.

[0003] The above content is only used to assist in understanding the technical solution of the utility model and does not constitute an admission that the above content is prior art. Utility Model Content

[0004] In view of the above problems, the present invention provides a hair cutter, which aims to solve the technical problem that the connection between the transmission shaft and the fixing seat of the hair cutter is easily loosened.

[0005] To achieve the above-mentioned purpose, the hair cutter proposed in the present invention includes a housing, a motor, a seal, a fixing seat, a sleeve and a first transmission rod:

[0006] The housing has a mounting cavity and a through hole communicating with the mounting cavity;

[0007] The motor is arranged in the installation cavity;

[0008] The sealing member is fixedly connected to the housing and covers the through hole, and the sealing member is provided with an axial hole;

[0009] The fixing seat includes a base and a connecting portion that are connected to each other, the connecting portion passes through the shaft hole and is tightly fixed to the sealing member, and the base is connected to the output end of the motor and can reciprocate under the drive of the motor;

[0010] The sleeve is fixedly embedded in the connecting portion, and the hardness of the sleeve is greater than the hardness of the connecting portion;

[0011] The first transmission rod is fixedly installed in the sleeve.

[0012] In one embodiment, the sealing member comprises a sealing cylinder extending along the axial direction of the first transmission rod, the axial hole being formed in the middle of the sealing cylinder; and the connecting portion is adapted to be embedded in the sealing cylinder.

[0013] In one embodiment, an embedded convex ring is provided on the inner peripheral wall of the sealing cylinder, and an embedded groove adapted to the embedded convex ring is provided on the outer peripheral wall of the connecting portion.

[0014] In one embodiment, the sealing member further includes a sealing body and a connecting ring connected to the outer peripheral wall of the sealing body, wherein the sealing body is connected to the outer wall of the sealing cylinder; and the connecting ring is fixedly connected to the housing.

[0015] In one embodiment, an embedding hole is provided in the connecting portion, and the sleeve is embedded in the embedding hole.

[0016] In one embodiment, the sleeve also includes a limiting groove connected to the embedding hole, and the sleeve includes an embedding portion and a limiting portion connected to each other, the embedding portion is embedded in the embedding hole, and the limiting portion is installed in the limiting groove along the axial direction of the first transmission rod and in the circumferential direction of the first transmission rod.

[0017] In one embodiment, a limiting groove is provided at each end of the embedding hole, and the inner peripheral wall of the limiting groove is located outside the inner peripheral wall of the embedding hole; the limiting portion is adapted to be installed in the limiting groove.

[0018] In one embodiment, the sleeve has a fixing hole, and the first transmission rod is embedded in the fixing hole; the sleeve and the first transmission rod are both made of metal, and the fixing seat is made of plastic.

[0019] In one embodiment, the sleeve and the first transmission rod are welded on a side close to the motor.

[0020] In one embodiment, a sealant is provided at a welding point between the sleeve and the first transmission rod.

[0021] In one embodiment, the sealing member is connected to the connecting portion by injection molding, and / or the sleeve is connected to the connecting portion by injection molding.

[0022] In one embodiment, the hair cutter further comprises a connecting member and at least one second transmission rod, wherein the connecting member is disposed on a side of the sealing member away from the base and is fixedly connected to the first transmission rod; the at least one second transmission rod is disposed on the connecting member and arranged side by side with the first transmission rod.

[0023] In one embodiment, the second transmission rod and the first transmission rod are both connected to the connecting member by secondary injection molding.

[0024] In one embodiment, a rotation-stopping portion is provided on an outer peripheral wall of the first transmission rod, and a fitting portion is provided on the connecting member corresponding to the rotation-stopping portion. The rotation-stopping portion is fitted with the fitting portion at an upper limit position in the circumferential direction of the first transmission rod.

[0025] In one embodiment, the connecting member includes a first mounting portion and at least one second mounting portion connected to each other, the first transmission rod is fixedly connected to the first mounting portion, and each second transmission rod is fixedly mounted on a second mounting portion; the first mounting portion abuts the connecting portion and the top of the sleeve; the bottom surface of the second mounting portion facing the seal is higher than the bottom surface of the first mounting portion facing the seal.

[0026] The sealing structure of the first transmission rod of the hair cutter of this utility model comprises a fixed base connected to the output end of the motor, including a connecting portion. The connecting portion is passed through the axial hole of the seal and is tightly fixed to the seal. A sleeve of greater rigidity is fixedly embedded within the connecting portion, securing the first transmission rod within the sleeve. This prevents direct contact between the first transmission rod and the seal, reducing friction frequency and increasing the sealing surface area, thereby extending the service life of the seal. Furthermore, the fixed connection between the first transmission rod and the sleeve of greater rigidity ensures a secure connection between the first transmission rod and the connecting portion, preventing loosening of the connection due to vibration transmitted from the motor, further extending the service life of the seal, and ensuring a waterproof seal at the connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 This is a structural diagram of an embodiment of a hair cutter according to the present invention;

[0029] Figure 2 for Figure 1 A schematic diagram of the structure of the hair cutter with the cutter head assembly removed;

[0030] Figure 3 for Figure 2 Exploded view of the structure;

[0031] Figure 4 This is a cross-sectional view of the assembled transmission shaft sealing structure and motor of the utility model.

[0032] Figure 5 A schematic structural diagram of an embodiment of a transmission shaft sealing structure of the present invention is shown;

[0033] Figure 6 for Figure 5 A cross-sectional view of the transmission shaft sealing structure at one angle;

[0034] Figure 7 for Figure 5 A top view of the middle transmission shaft sealing structure;

[0035] Figure 8 for Figure 7 a cross-sectional view along line IV-IV;

[0036] Figure 9 for Figure 7 A cross-sectional view along line VV;

[0037] Figure 10 for Figure 5 Exploded view of the medium hair cutter;

[0038] Figure 11 for Figure 10 a cross-sectional view of the hair cutter at one angle;

[0039] Figure 12 for Figure 11 Schematic diagram of the hair cutter from another angle.

[0040] Description of Figure Numbers:

[0041] Label name Label name Label name 100 Transmission rod sealing structure 131 base 151 anti-rotation part 110 case 132 Connection 160 Connectors 111 through-hole 133 Embedded groove 161 Coordination Department 120 seals 134 Embedded hole 162 First installation part 121 shaft hole 135 Limit slot 163 Second installation part 122 Sealing cylinder 136 Limit plane 170 Second transmission rod 123 Embedded raised ring 140 sleeve 200 motor 124 Sealing body 141 Embedded part 210 Output 125 Connecting ring 142 Limiting part 300 Cutting head assembly 130 Fixed seat 150 First transmission rod

[0042] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0044] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0045] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features specified as "first" or "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text is to include three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that meet both A and B.

[0046] The utility model provides a hair cutter with a transmission rod sealing structure. The hair cutter may specifically be a shaver.

[0047] In the embodiment of this utility model, please refer to Figures 1 to 10 The transmission rod sealing structure of the hair cutter includes a transmission rod sealing structure 100 and a motor 200. The transmission rod sealing structure 100 includes a housing 110, a sealing member 120, a fixing base 130, a sleeve 140, and a first transmission rod 150. The housing 110 has a mounting cavity and a through hole 111 communicating with the mounting cavity. The motor 200 is disposed in the mounting cavity. The sealing member 120 is fixedly connected to the housing 110 and covers the through hole 111. The sealing member 120 has an axial hole 121. The fixing base 130 includes a base 131 and a connecting portion 132 connected to each other. The connecting portion 132 passes through the axial hole 121 and is tightly fixed to the sealing member 120. The base 131 is connected to the output end 210 of the motor 200 and can reciprocate under the drive of the motor 200. The sleeve 140 is fixedly embedded in the connecting portion 132. The hardness of the sleeve 140 is greater than that of the connecting portion 132. The first transmission rod 150 is fixedly mounted in the sleeve 140.

[0048] In this embodiment, the motor 200 specifically includes a stator assembly and a mover assembly. The mover assembly includes a permanent magnet and a connecting base. The permanent magnet is fixed to the connecting base, and the connecting base forms an output terminal 210. The stator assembly includes an iron core, a winding frame, and a coil. The coil is wound on the winding frame and mounted on the iron core via the winding frame. The iron core can be a U-shaped iron core, an E-shaped iron core, or other types of iron cores. Different types of iron cores can be selected according to actual needs and are not specifically limited here. When alternating positive and negative currents are passed through the coil, the stator assembly forms an electromagnet. Through the magnetic induction effect between the electromagnet and the permanent magnet of the mover assembly, the mover assembly is driven to reciprocate in a predetermined direction. Specifically, the base 131 is fixedly connected to the connecting base of the stator assembly by screws. By connecting the first transmission rod 150 to the cutter head assembly 300, the motor 200 can drive the moving blade of the cutter head assembly 300 to rapidly reciprocate relative to the stationary blade, thereby achieving hair cutting.

[0049] The housing provides housing and protection for the entire internal structure of the hair cutter. Its structure and form can vary, and are not specifically limited here. Typically, the through hole is located in the top wall of the housing. The seal 120 is typically made of a flexible sealing material such as silicone or rubber. Specifically, the seal 120 is configured with multiple pleats or a skirt, meaning it can deform both laterally and longitudinally. This allows the seal 120 to seal the first transmission rod 150 without affecting its reciprocating motion.

[0050] The seal 120 can be fixedly connected to the housing 110 by means of crimping, splicing, bonding, injection molding, or other methods. Specifically, the housing 110 includes a main body and a top cover. The upper end of the main body is open, and a mounting cavity is formed within the main body. The top cover covers the open portion of the main body and includes a pressure plate and a bottom shell connected to each other. The pressure plate and the bottom shell are provided with a communicating through hole 111. The seal 120 is disposed at the through hole 111, and the periphery of the seal 120 is crimped between the pressure plate and the bottom shell. This makes the connection between the seal 120 and the housing 110 more stable and reliable, and facilitates the removal, assembly, and replacement of the seal 120 relative to the housing 110.

[0051] The base 131 of the fixing seat 130 can be fixedly connected to the output end 210 of the motor 200 by screws. The connecting portion 132 of the fixing seat 130 is specifically cylindrical, and the connecting portion 132 is adapted to be embedded in the shaft hole 121 of the sealing member 120. The inner diameter of the shaft hole 121 can be made slightly smaller than or equal to the outer diameter of the connecting portion 132 to ensure that the sealing member 120 and the connecting portion 132 fit tightly. The sealing member 120 and the connecting portion 132 can be tightly fitted and fixed by injection molding, tightening with a clamping ring, etc. It is understandable that in order to ensure structural strength, the first transmission rod 150 is usually made of metal. If the sealing member 120 is in direct contact with the first transmission rod 150, since the first transmission rod 150 needs to reciprocate for a long time, the friction frequency between the two is high, and the seal between the two is more likely to fail after long-term use. The fixing seat 130 is usually made of plastic. In this way, the connecting portion 132 is tightly fitted and fixed to the wall of the axial hole 121 of the seal 120, while ensuring the waterproof effect of the connection between the fixing seat 130 and the seal 120, avoiding direct contact between the seal 120 and the first transmission rod 150, reducing the friction frequency of the seal 120, and the connecting portion 132 has a larger outer diameter than the first transmission rod 150, which can increase the sealing fitting area, thereby improving the service life and sealing effect of the seal 120.

[0052] The hardness of sleeve 140 is greater than that of connecting portion 132. Specifically, sleeve 140 is made of metal, while fixing base 130 is made of plastic. Sleeve 140 can be fixedly embedded in connecting portion 132 through injection molding, interference fit, or other methods. First transmission rod 150 and sleeve 140 can be fixedly connected by welding. This facilitates the connection between first transmission rod 150 and connecting portion 132 while ensuring a reliable connection between the two.

[0053] The sealing structure of the first transmission rod 150 of the present invention is such that the fixing base 130 connected to the output end 210 of the motor 200 includes a connecting portion 132, the connecting portion 132 is passed through the axial hole 121 of the seal 120 and is tightly fixed to the seal 120, and at the same time, a sleeve 140 with a greater hardness is fixedly embedded in the connecting portion 132, so that the first transmission rod 150 is fixedly installed in the sleeve 140. In this way, the first transmission rod 150 can be prevented from directly contacting the seal 120, reducing the friction frequency. Moreover, the outer diameter of the connecting portion 132 is larger than the outer diameter of the first transmission rod 150, which can increase the sealing mating area, thereby improving the service life and sealing effect of the seal 120. At the same time, the first transmission rod 150 can be fixedly connected to the sleeve 140 with a greater hardness, which can ensure the stability of the connection between the first transmission rod 150 and the connecting portion 132, avoid the connection from loosening due to the vibration transmission of the motor 200, further improve the service life of the seal 120, and ensure the waterproof sealing effect of the connection between the two.

[0054] In one embodiment, please refer to Figures 4 to 12 The seal 120 includes a sealing cylinder 122 extending axially along the first transmission rod 150. An axial hole 121 is formed in the middle of the sealing cylinder 122. The connecting portion 132 is adapted to be embedded in the sealing cylinder 122. Because the first transmission rod 150 needs to move back and forth and has a large range of motion, the seal 120 is usually larger. If the seal 120 only cooperates with the connecting portion 132 through the axial hole 121, which is as high as the seal 120's thickness, the sealing area is small and the sealing effect cannot be guaranteed. By providing the sealing cylinder 122, the sealing area between the seal 120 and the connecting portion 132 can be increased, thereby improving the sealing reliability.

[0055] Further, if Figures 6 to 12As shown, the inner circumferential wall of the sealing sleeve 122 is provided with an embedded protruding ring 123, and the outer circumferential wall of the connecting portion 132 is provided with an embedded groove 133 that matches the embedded protruding ring 123. The cooperation between the embedded protruding ring 123 and the embedded groove 133 effectively prevents the sealing sleeve 122 and the connecting portion 132 from loosening in the axial direction, further ensuring the sealing reliability of the two. The embedded protruding ring 123 can be provided in one or more positions. When the embedded protruding ring 123 is provided in multiple positions, the multiple embedded protruding rings 123 are spaced apart in the axial direction of the sealing sleeve 122; the outer circumferential wall of the connecting portion 132 is provided with multiple embedded grooves 133 that match them. This further improves the sealing reliability of the two.

[0056] Furthermore, the sealing member 120 further includes a sealing body 124 and a connecting ring 125 connected to the outer peripheral wall of the sealing body 124 . The sealing body 124 is connected to the outer wall of the sealing cylinder 122 ; the connecting ring 125 is fixedly connected to the housing 110 .

[0057] In this embodiment, the connecting ring 125 can be fixedly connected to the housing 110 by means of crimping, crimping, bonding, etc. By providing the connecting ring 125 to be connected to the housing 110, the deformation of the sealing body 124 is not affected while ensuring a reliable and convenient connection.

[0058] In conjunction with the above embodiment in which the inner circumferential wall of the sealing cylinder is provided with an embedded protruding ring 123, the sealing body 124 is further connected to the sealing cylinder 122 at a position corresponding to the embedded protruding ring 123. This can increase the thickness of the connection between the sealing body 124 and the sealing cylinder 122, thereby increasing the structural strength of the connection between the sealing body 124 and the sealing cylinder 122 and preventing breakage due to long-term movement.

[0059] Further, please refer again to Figure 8 and Figure 9 Both ends of the sealing cylinder 122 extend beyond the sealing body 124. This further increases the length of the sealing cylinder 122, providing a sufficient sealing area between the sealing cylinder 122 and the connecting portion 132, thereby ensuring a good sealing effect. Furthermore, both ends of the sealing cylinder 122 extend beyond the sealing body 124, meaning that the sealing body 124 is connected to the middle of the length of the connecting cylinder. This allows for more uniform deformation of the upper and lower sides of the sealing body 124.

[0060] In one embodiment, as shown in 8 and Figure 9 As shown, the extension length of the sleeve 140 is greater than the extension length of the sealing tube 122. In this way, the connection area between the sleeve 140 and the first transmission rod 150 can be increased, further improving the connection stability between the first transmission rod 150 and the sleeve 140.

[0061] Specifically, if Figures 6 to 12As shown, an embedding hole 134 is defined in the connecting portion 132, and the sleeve 140 is embedded in the embedding hole 134. This improves the convenience of assembling the two.

[0062] Further, please refer to Figure 6 、 Figure 8 and Figure 10 The sleeve 140 also includes a limiting groove 135 connected to the embedding hole 134. The sleeve 140 includes an embedding portion 141 and a limiting portion 142 connected to each other. The embedding portion 141 is embedded in the embedding hole 134, and the limiting portion 142 is installed in the limiting groove 135 along the axial direction of the first transmission rod 150 and in the circumferential direction of the first transmission rod 150.

[0063] In this embodiment, the cooperation between the limiting portion 142 and the limiting groove 135 prevents the sleeve 140 from rotating and moving axially relative to the fixed base 130, thereby preventing the first transmission rod 150 from rotating and causing the cutter head to shake and affect cutting efficiency, thereby ensuring the product's performance. The limiting portion 142 and the limiting groove 135 can have many different configurations. As long as the cross-section of the limiting groove is non-circular, the limiting portion 142 can be embedded in the limiting groove 135 to achieve circumferential positioning, preventing relative rotation and axial movement between the two. Specifically, the cross-section of the limiting portion 142 can be elliptical, racetrack-shaped, or rectangular with rounded corners, etc.

[0064] Further, please refer to Figures 10 to 12 A limiting groove 135 is provided at each end of the embedding hole 134. The inner circumferential wall of the limiting groove 135 is located outside the inner circumferential wall of the embedding hole 134. The limiting portion 142 is adapted to be installed in the limiting groove 135. Specifically, the limiting groove 135 has a limiting plane 136. The limiting plane 136 cooperates with the limiting portion 142 to achieve circumferential limitation of the sleeve 140 and the connecting portion 132. The inner circumferential wall of the limiting groove 135 is located outside the inner circumferential wall of the embedding hole 134. When the limiting portion 142 is installed in the limiting groove 135, it overlaps the hole wall of the embedding hole 134. The limiting portions 142 at both ends of the sleeve 140 cooperate with the limiting groove 135 to achieve axial limitation. In this embodiment, a limiting groove 135 is provided at each end of the embedding hole 134, so that both ends of the sleeve 140 are circumferentially limited with the connecting portion 132. While improving the reliability of the circumferential limit, it can also prevent the sleeve 140 and the connecting portion 132 from loosening in the axial direction, thereby improving the connection reliability between the two.

[0065] In one embodiment, the sleeve 140 has a fixing hole, and the first transmission rod 150 is embedded in the fixing hole. The sleeve 140 and the first transmission rod 150 are both made of metal, and the fixing seat 130 is made of plastic.

[0066] In this embodiment, the sleeve 140 and the first transmission rod 150 can be made of metal, such as stainless steel. When both the sleeve 140 and the first transmission rod 150 are made of metal, the first transmission rod 150 and the sleeve 140 are more easily secured. The fixing base 130 is made of plastic, which is easier to form into complex structures. Furthermore, compared to metal, the plastic connection portion 132 is more easily sealed with the seal 120.

[0067] Furthermore, the sleeve 140 and the first transmission rod 150 are welded together on the side near the motor 200. Specifically, laser welding can be used to weld the gap between the sleeve 140 and the first transmission rod 150 near the motor 200. Welding the sleeve 140 and the first transmission rod 150 ensures a secure connection and facilitates the welding operation.

[0068] Furthermore, a sealant is provided at the welding point between the sleeve 140 and the first transmission rod 150. By filling the sealant at the bottom of the connection point between the sleeve 140 and the first transmission rod 150, the sealing effect can be further ensured.

[0069] In combination with the above embodiment in which the sleeve 140 and the first transmission rod 150 are made of metal and the fixing seat 130 is made of plastic, further, the seal 120 is injection-molded to the connecting portion 132; and / or the sleeve 140 is injection-molded to the connecting portion 132.

[0070] The sleeve 140 and the connecting portion 132, as well as the seal 120 and the connecting portion 132, can both be connected by secondary injection molding. In practice, the sleeve 140 and the connecting portion 132 are first injection-molded to form assembly A, and then assembly A is injection-molded to the seal 120. Because the connection between the first transmission rod 150 and the seal 120 is susceptible to loosening due to prolonged vibration, injection-molding the sleeve 140 and the connecting portion 132, and the seal 120 and the connecting portion 132, ensures a secure and reliable connection between the two, thereby preventing loosening and improving the sealing effect between the first transmission rod 150 and the seal 120.

[0071] In one embodiment, if Figures 5 to 10As shown, the hair cutter further includes a connecting member 160 and at least one second transmission rod 170. The connecting member 160 is disposed on a side of the sealing member 120 away from the base 131 and is fixedly connected to the first transmission rod 150. The at least one second transmission rod 170 is also disposed on the connecting member 160 and arranged side by side with the first transmission rod 150. The connecting member 160 is used to connect the first transmission rod 150 and the second transmission rod 170, thereby connecting the first transmission rod 150 and the second transmission rod 170 into a single unit. As a result, only the output end 210 of the motor 200 is required to drive the multiple second transmission rods 170 and the first transmission rod 150 to move back and forth synchronously. This effectively reduces costs while meeting the requirements of multi-head cutting and achieves a miniaturized hair trimmer.

[0072] In one embodiment, the second transmission rod 170 and the first transmission rod 150 are both connected to the connecting member 160 by secondary injection molding. The second transmission rod 170 and the first transmission rod 150 are specifically made of metal materials such as stainless steel, and the connecting member 160 is made of plastic. By making the second transmission rod 170 and the first transmission rod 150 connected to the connecting member 160 by secondary injection molding, compared with other connection methods, the stability of the connection can be guaranteed, and the first transmission rod 150 and the second transmission rod 170 can be prevented from shaking and affecting the cutting effect of the blade. In addition, after the second transmission rod 170, the first transmission rod 150 and the connecting member 160 are injection-molded into a whole, it is only necessary to pass the first transmission rod 150 through the sleeve 140 and weld it to the sleeve 140 to achieve the assembly of the second transmission rod 170 and the fixing seat 130, which can effectively improve the assembly efficiency.

[0073] In one embodiment, please refer to Figure 8 、 Figures 10 to 12 The outer peripheral wall of the first transmission rod 150 is provided with a stopper 151, and the connecting member 160 is provided with a mating portion 161 corresponding to the stopper 151. The stopper 151 engages with the mating portion 161 at the circumferential upper limit of the first transmission rod 150. The mating portion 151 and the mating portion 161 prevent the first transmission rod 150 from rotating relative to the connecting member 160, further preventing the second transmission rod 170 from rotating and affecting its connection with the corresponding cutting head. The structures of the stopper 151 and the mating portion 161 can be various, as long as they can be able to limit the rotation of the first transmission rod 150 relative to the connecting member 160 around its axis when they are mated, and no specific limitations are given here.

[0074] Furthermore, the mating portion 161 includes a stop groove provided on the top and bottom walls of the connector 160, and the first transmission rod 150 is provided with two stop portions 151 corresponding to the two stop grooves. Specifically, as long as the cross-sectional shapes of the stop groove and the stop portion 151 are non-circular, the stop portion 151 can be embedded in the stop groove to achieve circumferential limitation and prevent relative rotation between the two. Specifically, the cross-sectional shape of the stop groove can be elliptical, runway-shaped, or rounded rectangular. By providing stop grooves on both the top and bottom walls of the connector 160, when the first transmission rod 150 is installed on the connector 160, the two stop portions 151 cooperate with the two stop grooves, thereby achieving circumferential limitation at both ends and preventing the first transmission rod 150 from axially loosening from the connector 160, thereby further improving the connection reliability between the first transmission rod 150 and the connector 160. In other embodiments, the second transmission rod 170 is also provided with the anti-rotation portion 151, so that the second transmission rod 170 and the connecting portion 132 cooperate with the anti-rotation groove through the anti-rotation portion 151 to achieve circumferential limitation.

[0075] In one embodiment, if Figure 4 、 Figure 6 、 Figure 9 、 Figure 10 、 Figure 12 As shown, the connecting member 160 includes a first mounting portion 162 and at least one second mounting portion 163 that are interconnected, the first transmission rod 150 is fixedly connected to the first mounting portion 162, and each second transmission rod 170 is fixedly mounted on a second mounting portion 163; the first mounting portion 162 abuts against the top of the connecting portion 132 and the sleeve 140; the bottom surface of the second mounting portion 163 facing the seal 120 is higher than the bottom surface of the first mounting portion 162 facing the seal 120.

[0076] In this embodiment, the first mounting portion 162 of the connector 160 is used to mount the first transmission rod 150, and the second mounting portion 163 is used to mount the second transmission rod 170. The first mounting portion 162 is positioned against the top of the connector 132 and the sleeve 140. This, on the one hand, facilitates welding of the first transmission rod 150 and the sleeve 140. On the other hand, the first mounting portion 162 can also shield the connection between the connector 132 and the sleeve 140, acting as a secondary seal and further enhancing the overall sealing effect of the shaft connection. The bottom surface of the second mounting portion 163 facing the seal 120 is higher than the bottom surface of the first mounting portion 162 facing the seal 120, so that the second mounting portion 163 is spaced apart from the seal 120. This prevents the second mounting portion 163 from rubbing against the seal 120, thereby extending the service life of the seal 120 and preventing friction noise.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A hair cutter, characterized in that: include: a housing having a mounting cavity and a through hole communicating with the mounting cavity; a motor, disposed in the mounting cavity; A sealing member is fixedly connected to the housing and covers the through hole, and the sealing member is provided with an axial hole; A fixing seat, the fixing seat comprising a base and a connecting portion connected to each other, the connecting portion passing through the shaft hole and tightly fitting and fixed to the sealing member, the base being connected to the output end of the motor and capable of reciprocating motion driven by the motor; a sleeve fixedly embedded in the connecting portion, wherein the hardness of the sleeve is greater than the hardness of the connecting portion; and The first transmission rod is fixedly installed in the sleeve.

2. The hair cutter according to claim 1, wherein The sealing component comprises a sealing cylinder extending along the axial direction of the first transmission rod, the axial hole being formed in the middle of the sealing cylinder; and the connecting portion is adapted to be embedded in the sealing cylinder.

3. The hair cutter according to claim 2, characterized in that An embedded convex ring is provided on the inner peripheral wall of the sealing cylinder, and an embedded groove adapted to the embedded convex ring is provided on the outer peripheral wall of the connecting portion.

4. The hair cutter according to claim 2, wherein The sealing member further comprises a sealing body and a connecting ring connected to the outer peripheral wall of the sealing body. The sealing body is connected to the outer wall of the sealing cylinder; the connecting ring is fixedly connected to the housing.

5. The hair cutter according to claim 1, wherein An embedding hole is provided in the connecting portion, and the sleeve is embedded in the embedding hole.

6. The hair cutter according to claim 5, characterized in that The sleeve also includes a limiting groove connected to the embedding hole. The sleeve includes an embedding portion and a limiting portion that are connected to each other. The embedding portion is embedded in the embedding hole. The limiting portion is installed in the limiting groove along the axial direction of the first transmission rod and in the circumferential direction of the first transmission rod.

7. The hair cutter according to claim 6, wherein A limiting groove is respectively provided at both ends of the embedding hole, and the inner peripheral wall of the limiting groove is located outside the inner peripheral wall of the embedding hole; the limiting portion is adapted to be installed in the limiting groove.

8. The hair cutter according to claim 5, wherein The sleeve has a fixing hole, and the first transmission rod is embedded in the fixing hole; the sleeve and the first transmission rod are both made of metal, and the fixing seat is made of plastic.

9. The hair cutter according to claim 8, characterized in that The sleeve and the first transmission rod are welded at a side close to the motor.

10. The hair cutter according to claim 9, characterized in that A sealant is provided at the welding point between the sleeve and the first transmission rod.

11. The hair cutter according to claim 8, wherein The sealing element is connected to the connecting portion by injection molding, and / or the sleeve is connected to the connecting portion by injection molding.

12. The hair cutter according to any one of claims 1 to 11, characterized in that The hair cutter further includes a connecting member and at least one second transmission rod. The connecting member is provided on a side of the sealing member away from the base and is fixedly connected to the first transmission rod. The at least one second transmission rod is provided on the connecting member and arranged side by side with the first transmission rod.

13. The hair cutter according to claim 12, wherein The second transmission rod and the first transmission rod are both connected to the connecting member by secondary injection molding.

14. The hair cutter according to claim 12, wherein The outer peripheral wall of the first transmission rod is provided with a rotation-stopping portion, and the connecting member is provided with a matching portion corresponding to the rotation-stopping portion. The rotation-stopping portion is matched with the matching portion at the upper limit position in the circumferential direction of the first transmission rod.

15. The hair cutter according to claim 12, wherein The connecting member includes a first mounting portion and at least one second mounting portion that are connected to each other, the first transmission rod is fixedly connected to the first mounting portion, and each second transmission rod is fixedly mounted on a second mounting portion; the first mounting portion abuts against the connecting portion and the top of the sleeve; the bottom surface of the second mounting portion facing the seal is higher than the bottom surface of the first mounting portion facing the seal.

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