Electric scissors

Abstract

The utility model belongs to the technical field of electric scissors, and particularly relates to electric scissors which comprise a shell, a driving motor and a shearing mechanism are arranged on the shell, a transmission mechanism is arranged between the driving motor and the shearing mechanism, the driving motor drives the shearing mechanism to shear through the transmission mechanism, a first bevel gear is connected to the driving motor, and a second bevel gear is connected to the second bevel gear. The transmission mechanism comprises a second bevel gear and a transmission gear which are coaxially arranged, and the first bevel gear is meshed with the second bevel gear; the shearing mechanism comprises a first blade and a second blade which are rotationally arranged, a first gear part and a second gear part are arranged on the first blade and the second blade correspondingly, and the first gear part and the second gear part are engaged with the two sides of the transmission gear correspondingly; the transmission gear drives the first blade and the second blade to rotate synchronously through the first gear part and the second gear part, so that the first blade and the second blade swing relatively, and the electric scissors are high in shearing speed and long in service life.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric scissors, in particular to an electric scissors. Background Art

[0002] Electric scissors are handheld electric tools that use an electric motor as power and drive the working head through a transmission mechanism to perform cutting operations.

[0003] Most of the electric scissors on the market now include two blades. When in use, the motor drives one blade to swing through the transmission mechanism, so that the two blades perform shearing operations. For example, a kind of electric scissors disclosed in Chinese utility model patent application CN202321773036.4 includes an electric scissors body and an electric power component arranged on the tail end of the electric scissors body. The head end of the electric scissors body is provided with an electric scissors tool, and the electric scissors tool includes a first blade and a second blade connected to the head end of the electric scissors body by a coaxial line, and the first blade and the second blade are movably assembled through a swinging blade shaft component. A transmission gear is installed on the head end of the electric scissors body, and the transmission gear is driven by the electric scissors body. The lower end of the first blade is engaged with the meshing teeth of the transmission gear. The transmission gear is provided with an axis, and correspondingly, a sliding groove is provided on the first blade, and the sliding groove and the axis cooperate with each other to provide the first blade with reciprocating motion. The utility model avoids the use of a connecting rod component in the cutter head, greatly reduces the difficulty of production and installation, is conducive to mass production, and can better meet the use requirements.

[0004] In the above structure, only one blade moves, and the shearing speed is slow. When shearing for a long time or the working intensity is high, the moving blade is easy to warp, which affects the service life of the product. Summary of the invention

[0005] In order to overcome the defects in the prior art, the purpose of the utility model is to provide an electric scissors with fast cutting speed and long service life.

[0006] The purpose of the utility model is achieved in this way:

[0007] An electric scissors, comprising a housing, a driving motor and a shearing mechanism are arranged on the housing, a transmission mechanism is arranged between the driving motor and the shearing mechanism, the driving motor drives the shearing mechanism to shear through the transmission mechanism, the driving motor is connected to a first bevel gear, the transmission mechanism comprises a coaxially arranged second bevel gear and a transmission gear, the first bevel gear is meshed with the second bevel gear;

[0008] The shearing mechanism includes a first blade and a second blade which are rotatably arranged. The first blade and the second blade are respectively provided with a first gear portion and a second gear portion. The first gear portion and the second gear portion are respectively meshed with two sides of a transmission gear. The transmission gear drives the first blade and the second blade to rotate synchronously through the first gear portion and the second gear portion, thereby causing the first blade and the second blade to swing relative to each other.

[0009] The utility model is further configured as follows: the second blade includes a blade body, the blade body is arranged on one side of the transmission gear, an extension arm is arranged on the blade body, the second gear part is arranged on the extension arm, the extension arm passes over the end of the transmission gear, and the blade body and the second gear part are respectively arranged on both sides of the transmission gear.

[0010] The utility model is further configured as follows: a gap-avoiding portion is arranged on the extension arm, a transmission gear is passed through the gap-avoiding portion and the transmission gear is located in the extension direction of the end of the blade body.

[0011] The utility model is further configured as follows: the first gear portion penetrates into the gap-avoiding portion, so that the first gear portion and the second gear portion are arranged opposite to each other.

[0012] The utility model is further configured as follows: a mounting seat detachably connected to a driving motor is provided in the housing, the first blade and the second blade are rotatably provided on the mounting seat via a first hinge shaft, the transmission gear and the second bevel gear are rotatably provided on the mounting seat via a second hinge shaft, and the first bevel gear is rotatably provided on the mounting seat and detachably connected to the driving motor.

[0013] The utility model is further configured as follows: a first mounting hole is provided on the mounting seat, a limit sleeve is detachably provided in the first mounting hole, a special-shaped hole is provided in the limit sleeve, and the first hinge shaft cooperates with the special-shaped hole to prevent the first hinge shaft and the mounting seat from rotating relative to each other.

[0014] The utility model is further configured as follows: the end of the limiting sleeve is provided with a pressing wall against the first blade or the second blade, and a plurality of oil storage grooves are provided on the pressing wall, the first blade or the second blade presses against the pressing wall and makes the end of the oil storage groove press against the pressing wall.

[0015] The utility model is further configured as follows: a limiting convex edge is provided at one end of the first hinge shaft, a nut is detachably provided at the other end of the first hinge shaft, the first hinge shaft and the nut are connected so that the first hinge shaft and the mounting seat are relatively fixed, the first blade and the second blade are both arranged between the limiting convex edge and the mounting seat, limiting teeth are provided on the outer circumference of the nut, and a locking piece adapted to the limiting teeth is detachably provided on the mounting seat.

[0016] The utility model is further configured as follows: the transmission gear and the second hinge shaft are integrally arranged, and the second hinge shaft passes through the mounting seat and is detachably connected to the second bevel gear.

[0017] The utility model is further configured as follows: a rotating hole is respectively provided on the first blade and the second blade, an oil storage hole is provided in the first hinge shaft, a sealing plug is provided at the end of the oil storage hole, and an oil outlet hole is provided on the side of the oil storage hole; the first hinge shaft is rotatably connected to the first blade and the second blade, and the end of the oil outlet hole is inserted into the rotating hole.

[0018] Compared with the prior art, the utility model has the following advantages:

[0019] 1. In the utility model, the installation direction of the driving motor is changed by the first bevel gear and the second bevel gear, so as to facilitate the use and control of the electric scissors, and the transmission gear drives the first blade and the second blade to rotate synchronously, the shearing speed is slow, and the first blade and the second blade are not easy to warp when shearing for a long time or working with high intensity, which is beneficial to prolonging the service life of the electric scissors. Since the first gear part and the second gear part are respectively meshed with the two sides of the transmission gear, it is avoided that the transmission gear is damaged due to excessive force on one side.

[0020] 2. In the utility model, the blade body and the second gear part are respectively arranged on both sides of the transmission gear through the extension arm, which is convenient for the installation of the first blade and the second blade, and is beneficial to increasing the force arm of the second blade, thereby increasing the shearing force of the electric scissors and facilitating the use of users; the arrangement of the avoidance part makes the transmission gear located in the extension direction of the end of the blade body, avoiding the transmission gear causing the second blade to tilt toward the direction of the rotating axis during use, thereby affecting the shearing of the first blade and the second blade by the article; the first gear part and the second gear part arranged relatively to each other facilitate uniform force on both sides of the transmission gear, avoiding excessive force on one side of the transmission gear and causing deflection and damage.

[0021] 3. In the utility model, the driving motor, the shearing mechanism and the transmission mechanism are detachably arranged on the mounting seat, which is convenient for the stable installation and matching of each part, convenient for assembly and production, and reduces the damage of the electric scissors caused by installation errors.

[0022] 4. In the utility model, the special-shaped hole in the limit sleeve is used to avoid relative rotation between the first hinge shaft and the mounting seat during use, thereby avoiding wear and loosening of the connection position between the first hinge shaft and the mounting seat after long-term use. The setting of the limit sleeve can make the mounting seat suitable for first hinge shafts of different specifications; the setting of the abutment wall and the liquid storage tank can reduce the friction between the first blade or the second blade and the limit sleeve during use, which is beneficial to extending the service life of the electric scissors.

[0023] 5. The setting of the limiting convex edge and the nut in the utility model facilitates the disassembly and installation of the first blade and the second blade, while the limiting teeth and the detachable locking member prevent the nut from loosening after long-term use, thereby preventing the electric scissors from accidental damage.

[0024] 6. The integrated transmission gear and the second hinge shaft in the utility model facilitate the assembly and production of the electric scissors, and the second hinge shaft penetrating the mounting seat enables the transmission gear and the second bevel gear to be respectively arranged on both sides of the mounting seat, thereby avoiding bending and deformation of the second hinge shaft during use; the arrangement of the oil storage hole and the oil outlet hole facilitates lubrication of the movement of the first blade and the second blade for a long time, which is beneficial to extending the service life of the electric scissors. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the utility model;

[0026] Figure 2 It is a partial structural schematic diagram of the transmission structure in the utility model;

[0027] Figure 3 It is a partial cross-sectional view of the transmission structure in the utility model;

[0028] Figure 4 It is an exploded schematic diagram of the transmission structure in the utility model;

[0029] Figure 5 It is a structural schematic diagram of the mounting seat in the utility model;

[0030] Figure 6 It is a schematic diagram of the connection structure of the transmission gear, the first blade and the second blade in the utility model;

[0031] Figure 7 It is a structural schematic diagram of the first blade in the utility model;

[0032] Figure 8 It is a structural schematic diagram of the second blade in the utility model;

[0033] Fig. 9 It is an exploded schematic diagram of the connection structure between the driving motor and the first bevel gear in the utility model;

[0034] Fig.10 It is a structural schematic diagram of the first hinge shaft in the utility model;

[0035] Fig.11 It is a structural schematic diagram of the limit sleeve in the utility model;

[0036] Fig.12 It is a structural schematic diagram of the nut in the utility model;

[0037] Fig.13 It is a structural schematic diagram of the locking member in the utility model.

[0038] Meaning of the numbers in the figure: 1-housing; 2-mounting seat; 21-first mounting hole; 22-second mounting hole;

[0039] 23-mounting groove; 24-opening; 25-first threaded portion; 3-first blade; 31-rotation hole;

[0040] 32-first gear part; 4-second blade; 41-blade body; 42-extension arm; 43-second gear part; 44-air-avoiding part; 5-driving motor; 51-first bevel gear; 52-first bearing; 53-driving groove;

[0041] 54-second threaded portion; 511-connecting rod; 512-driving portion; 6-transmission mechanism; 61-second bevel gear; 62-transmission gear; 63-second hinge shaft; 64-third bearing; 7-first hinge shaft; 71-sealing plug; 72-limiting sleeve; 73-oil storage hole; 74-oil outlet hole; 75-limiting convex edge; 76-rotating shaft portion; 77-positioning portion; 721-special-shaped hole; 722-tightening wall; 723-oil storage tank; 8-nut; 81-control portion; 82-limiting tooth; 9-locking piece; 91-perforation; 92-fixing groove. DETAILED DESCRIPTION

[0042] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments:

[0043] See also Figures 1 to 13 As shown, an electric scissors comprises a housing 1, a driving motor 5 and a shearing mechanism are arranged on the housing 1, a transmission mechanism 6 is arranged between the driving motor 5 and the shearing mechanism, the driving motor 5 drives the shearing mechanism to shear through the transmission mechanism 6, the driving motor 5 is connected to a first bevel gear 51, the transmission mechanism 6 comprises a coaxially arranged second bevel gear 61 and a transmission gear 62, the first bevel gear 51 is meshed with the second bevel gear 61; the shearing mechanism comprises a first blade 3 and a second blade 4 which are rotatably arranged, the first blade 3 and the second blade 4 are respectively provided with a first gear portion 32 and a second gear portion 43, the first gear portion 32 and the second gear portion 43 are respectively meshed with both sides of the transmission gear 62, and the transmission gear The wheel 62 drives the first blade 3 and the second blade 4 to rotate synchronously through the first gear portion 32 and the second gear portion 43, thereby causing the first blade 3 and the second blade 4 to swing relative to each other. In this structure, the installation direction of the drive motor 5 is changed by the first bevel gear 51 and the second bevel gear 61, thereby facilitating the use and control of the electric scissors. The transmission gear 62 drives the first blade 3 and the second blade 4 to rotate synchronously, and the shearing speed is slow. In addition, the first blade 3 and the second blade 4 are not prone to warping during long-term shearing or high-intensity work, which is beneficial to extending the service life of the electric scissors. Since the first gear portion 32 and the second gear portion 43 are respectively meshed with the two sides of the transmission gear 62, the transmission gear 62 is prevented from being damaged by excessive force on one side.

[0044] The housing 1 described in the utility model is provided with a mounting base 2 which is detachably connected to the driving motor 5. The first blade 3 and the second blade 4 are rotatably arranged on the mounting base 2 via the first hinge shaft 7. The transmission gear 62 and the second bevel gear 61 are rotatably arranged on the mounting base 2 via the second hinge shaft 63. The first bevel gear 51 is rotatably arranged on the mounting base 2 and is detachably connected to the driving motor 5. In this structure, the driving motor 5, the shearing mechanism and the transmission mechanism 6 are detachably arranged on the mounting base 2, which is convenient for the stable installation and matching of various parts, convenient for assembly and production, and reduces damage to the electric scissors caused by installation errors.

[0045] In this embodiment, a reduction structure is provided in the driving motor 5, and a driving groove 53 is provided at the output end of the reduction structure. A driving portion 512 adapted to the driving groove 53 is provided on the second bevel gear 61. The mounting seat and the driving motor 5 are respectively provided with a first threaded portion 25 and a second threaded portion 54. The first threaded portion 25 and the second threaded portion 54 cooperate to make the mounting seat and the driving motor 5 detachably connected, and to keep the driving portion 512 and the driving groove 53 in cooperation.

[0046] The mounting seat 2 is provided with a second mounting hole 22, and the second hinge shaft 63 is rotatably arranged in the second mounting hole 22 through a third bearing 64. The mounting seat 2 is provided with a mounting groove 23, and the first bevel gear 51 is arranged in the mounting groove 23. A connecting rod 511 is provided on the first bevel gear 51, and the connecting rod 511 is rotatably arranged in the mounting groove 23 through a first bearing 52. The first bearing 52 makes the first bevel gear 51 hidden in the mounting groove 23. An opening 24 is provided on the side of the mounting groove 23, and the first bevel gear 51 or the second bevel gear 61 penetrates into the opening 24 so that the first bevel gear 51 and the second bevel gear 61 are meshed with each other.

[0047] The second blade 4 includes a blade body 41, and the blade body 41 is arranged on one side of the transmission gear 62. An extension arm 42 is arranged on the blade body 41, and the second gear part 43 is arranged on the extension arm 42. The extension arm 42 passes over the end of the transmission gear 62, and the blade body 41 and the second gear part 43 are respectively arranged on both sides of the transmission gear 62. In this structure, the blade body 41 and the second gear part 43 are respectively arranged on both sides of the transmission gear 62 through the extension arm 42, which is convenient for the installation of the first blade 3 and the second blade 4, and is beneficial to increase the force arm of the second blade 4, thereby increasing the shearing force of the electric scissors and facilitating the use of users.

[0048] The extension arm 42 in the utility model is provided with a gap avoidance portion 44, and the transmission gear 62 is inserted into the gap avoidance portion 44 so that the transmission gear 62 is located in the extension direction of the end of the blade body 41. The setting of the gap avoidance portion 44 makes the transmission gear 62 located in the extension direction of the end of the blade body 41, thereby preventing the transmission gear 62 from causing the second blade 4 to tilt toward the direction of the rotation axis during use, thereby affecting the shearing of the first blade 3 and the second blade 4 on the object.

[0049] Preferably, the first gear portion 32 penetrates into the avoidance portion 44, so that the first gear portion 32 and the second gear portion 43 are arranged opposite to each other. The oppositely arranged first gear portion 32 and the second gear portion 43 facilitate uniform force on both sides of the transmission gear 62, thereby avoiding excessive force on one side of the transmission gear 62 and causing deflection and damage.

[0050] The mounting seat 2 is provided with a first mounting hole 21, in which a limiting sleeve 72 is detachably provided, and a special-shaped hole 721 is provided in the limiting sleeve 72. The first hinge shaft 7 cooperates with the special-shaped hole 721 and prevents the first hinge shaft 7 and the mounting seat 2 from rotating relative to each other. In this structure, the special-shaped hole 721 in the limiting sleeve 72 is used to prevent the first hinge shaft 7 and the mounting seat 2 from rotating relative to each other during use, and prevents the first hinge shaft 7 and the mounting seat 2 from wearing and loosening at the connection position after long-term use. In addition, the setting of the limiting sleeve 72 enables the mounting seat 2 to be suitable for first hinge shafts 7 of different specifications. In this structure, the special-shaped hole 721 in the limiting sleeve 72 is used to prevent the first hinge shaft 7 and the mounting seat 2 from rotating relative to each other during use, and prevents the first hinge shaft 7 and the mounting seat 2 from wearing and loosening at the connection position after long-term use. In addition, the setting of the limiting sleeve 72 enables the mounting seat 2 to be suitable for first hinge shafts 7 of different specifications.

[0051] The end of the limiting sleeve 72 in the utility model is provided with a pressing wall 722 that abuts against the first blade 3 or the second blade 4, and a plurality of oil storage grooves 723 are provided on the pressing wall 722. The first blade 3 or the second blade 4 presses against the pressing wall 722 and the end of the oil storage groove 723 presses against the pressing wall 722. The setting of the pressing wall 722 and the liquid storage groove can reduce the friction between the first blade 3 or the second blade 4 and the limiting sleeve 72 during use, which is beneficial to prolonging the service life of the electric scissors.

[0052] A limiting convex edge 75 is provided at one end of the first hinge shaft 7, and a nut 8 is detachably provided at the other end of the first hinge shaft 7. The first hinge shaft 7 is connected to the nut 8 so that the first hinge shaft 7 and the mounting seat 2 are relatively fixed. The first blade 3 and the second blade 4 are both arranged between the limiting convex edge 75 and the mounting seat 2. A limiting tooth 82 is provided on the outer circumference of the nut 8. A locking piece 9 adapted to the limiting tooth 82 is detachably provided on the mounting seat 2. The setting of the limiting convex edge 75 and the nut 8 facilitates the disassembly and installation of the first blade 3 and the second blade 4, and the limiting tooth 82 and the detachable locking piece 9 prevent the nut 8 from loosening after long-term use, thereby preventing the electric scissors from accidental damage.

[0053] In this embodiment, a control portion 81 is provided at the end of the nut 8, and limiting teeth 82 are evenly provided on the outer circumference of the nut 8. A through hole 91 and a fixing groove 92 adapted to the limiting teeth 82 are provided on the locking member 9. The fastener passes through the through hole 91 to fix the locking member 9 relative to the mounting seat 2.

[0054] The transmission gear 62 and the second articulated shaft 63 are integrally arranged, and the second articulated shaft 63 passes through the mounting seat 2 and is detachably connected to the second bevel gear 61. The integrally arranged transmission gear 62 and the second articulated shaft 63 facilitate the assembly and production of the electric scissors, and the second articulated shaft 63 passing through the mounting seat 2 enables the transmission gear 62 and the second bevel gear 61 to be respectively arranged on both sides of the mounting seat 2, thereby avoiding bending and deformation of the second articulated shaft 63 during use.

[0055] The first blade 3 and the second blade 4 are respectively provided with a rotating hole 31, the first hinge shaft 7 is provided with an oil storage hole 73, the end of the oil storage hole 73 is provided with a sealing plug 71, and the side of the oil storage hole 73 is provided with an oil outlet hole 74; the first hinge shaft 7 is rotatably connected with the first blade 3 and the second blade 4, and the end of the oil outlet hole 74 is inserted into the rotating hole 31. The setting of the oil storage hole 73 and the oil outlet hole 74 facilitates long-term lubrication of the movement of the first blade 3 and the second blade 4, which is beneficial to prolonging the service life of the electric scissors.

[0056] In this embodiment, the first hinge shaft 7 is provided with a shaft portion 76 adapted to the rotating hole 31, and the shaft portion 76 is provided with a positioning portion 77 adapted to the special-shaped hole 721. The end of the oil outlet hole 74 is arranged on the side wall of the shaft portion 76 and fits with the side wall of the rotating hole 31.

[0057] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An electric scissors, comprising a housing (1), a driving motor (5) and a shearing mechanism being arranged on the housing (1), a transmission mechanism (6) being arranged between the driving motor (5) and the shearing mechanism, the driving motor (5) driving the shearing mechanism through the transmission mechanism (6) to perform shearing, characterized in that: The driving motor (5) is connected to a first bevel gear (51), the transmission mechanism (6) comprises a coaxially arranged second bevel gear (61) and a transmission gear (62), and the first bevel gear (51) is meshed with the second bevel gear (61); The shearing mechanism comprises a first blade (3) and a second blade (4) which are rotatably arranged, wherein the first blade (3) and the second blade (4) are respectively provided with a first gear portion (32) and a second gear portion (43), and the first gear portion (32) and the second gear portion (43) are respectively meshed with two sides of a transmission gear (62), and the transmission gear (62) drives the first blade (3) and the second blade (4) to rotate synchronously via the first gear portion (32) and the second gear portion (43), thereby causing the first blade (3) and the second blade (4) to swing relative to each other.

2. The electric scissors according to claim 1, characterized in that: The second blade (4) comprises a blade body (41), the blade body (41) being arranged on one side of a transmission gear (62), an extension arm (42) being arranged on the blade body (41), the second gear portion (43) being arranged on the extension arm (42), the extension arm (42) passing over an end of the transmission gear (62), and the blade body (41) and the second gear portion (43) being arranged on both sides of the transmission gear (62) respectively.

3. The electric scissors according to claim 2, characterized in that: The extension arm (42) is provided with a clearance portion (44), and the transmission gear (62) is inserted into the clearance portion (44) so ​​that the transmission gear (62) is located in the extension direction of the end of the blade body (41).

4. The electric scissors according to claim 3, characterized in that: The first gear portion (32) penetrates into the clearance portion (44), so that the first gear portion (32) and the second gear portion (43) are arranged opposite to each other.

5. The electric scissors according to claim 1, characterized in that: The housing (1) is provided with a mounting seat (2) which is detachably connected to the drive motor (5); the first blade (3) and the second blade (4) are rotatably arranged on the mounting seat (2) via a first hinge shaft (7); the transmission gear (62) and the second bevel gear (61) are rotatably arranged on the mounting seat (2) via a second hinge shaft (63); and the first bevel gear (51) is rotatably arranged on the mounting seat (2) and is detachably connected to the drive motor (5).

6. The electric scissors according to claim 5, characterized in that: The mounting seat (2) is provided with a first mounting hole (21), a limit sleeve (72) is detachably provided in the first mounting hole (21), a special-shaped hole (721) is provided in the limit sleeve (72), and the first hinge shaft (7) cooperates with the special-shaped hole (721) to prevent the first hinge shaft (7) and the mounting seat (2) from rotating relative to each other.

7. The electric scissors according to claim 6, characterized in that: The end of the limiting sleeve (72) is provided with a pressing wall (722) against which the first blade (3) or the second blade (4) is pressed, and a plurality of oil storage grooves (723) are provided on the pressing wall (722); the first blade (3) or the second blade (4) presses against the pressing wall (722) and causes the end of the oil storage groove (723) to press against the pressing wall (722).

8. An electric scissors according to claim 6 or 7, characterized in that: A limiting convex edge (75) is provided at one end of the first hinge shaft (7), and a nut (8) is detachably provided at the other end of the first hinge shaft (7). The first hinge shaft (7) and the nut (8) are connected so that the first hinge shaft (7) and the mounting seat (2) are relatively fixed. The first blade (3) and the second blade (4) are both arranged between the limiting convex edge (75) and the mounting seat (2). A limiting tooth (82) is provided on the outer circumference of the nut (8), and a locking member (9) adapted to the limiting tooth (82) is detachably provided on the mounting seat (2).

9. The electric scissors according to claim 5, characterized in that: The transmission gear (62) and the second hinge shaft (63) are integrally arranged, and the second hinge shaft (63) passes through the mounting seat (2) and is detachably connected to the second bevel gear (61).

10. The electric scissors according to claim 5, characterized in that: The first blade (3) and the second blade (4) are respectively provided with a rotation hole (31), the first hinge shaft (7) is provided with an oil storage hole (73), the end of the oil storage hole (73) is provided with a sealing plug (71), and the side of the oil storage hole (73) is provided with an oil outlet hole (74); the first hinge shaft (7) is rotationally connected to the first blade (3) and the second blade (4), and the end of the oil outlet hole (74) is inserted into the rotation hole (31).

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