CN220614070U - Blade replacing device and electric scissors with same - Google Patents

Abstract

The utility model discloses a blade replacing device and an electric scissors with the same, which are used for replacing a blade assembly connected by a bolt, wherein the blade replacing device comprises a locking piece, an operating piece and a limiting piece which are connected with the bolt in a threaded manner to fix the blade assembly; when the limiting piece is in a limiting state, the limiting piece is matched with the locking piece, a user can manually rotate the operating piece to drive the locking piece to screw around the axis direction, and the locking piece unscrews around the axis direction and is blocked by the limiting piece; when the limiting piece is in a non-limiting state, the limiting piece is separated from the locking piece, and the user can manually rotate the operating piece to drive the locking piece to screw or unscrew around the axis direction. The blade replacing device is simple and convenient to operate, and no additional disassembling tool is needed when the blade is replaced.

Description

Blade replacing device and electric scissors with same

Technical Field

The utility model relates to the technical field of electric scissors, in particular to a blade replacing device and an electric scissors with the same.

Background

Power tools that utilize blades for cutting operations often require blade replacement during use. Electric shears are a common garden electric tool that can be used to cut branches. The electric shears comprise a movable blade and a static blade, wherein the movable blade is rotatably connected with the static blade, and the movable blade is driven by a motor to reciprocate through a transmission mechanism so as to implement shearing action.

For electric shears, the use of bolts and nuts to secure the moving and stationary blades is a relatively mature and economical design. When replacing a blade, a user typically needs to detach a screw to open the housing using a screwdriver, and use a wrench to detach a nut from a bolt, and an assembly step needs to be performed after replacing a new blade. Because the electric scissors are mainly used outdoors, when the blades are worn to affect the cutting efficiency, users often want to quickly complete the replacement of the blades on site, which leads to the need of carrying tools such as screwdrivers, wrenches and the like with the users.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model provides a blade replacing device and an electric scissors with the same, wherein the blade replacing device is simple and convenient to operate, and no additional dismounting tool is needed when the blades are replaced.

The utility model is realized by the following technical scheme:

the blade replacing device is used for replacing a blade assembly connected by a bolt and comprises a locking piece, an operating piece and a limiting piece, wherein the locking piece is in threaded connection with the bolt to fix the blade assembly;

when the limiting piece is in a limiting state, the limiting piece is matched with the locking piece, a user can manually rotate the operating piece to drive the locking piece to screw around the axis, and the locking piece unscrews around the axis and is blocked by the limiting piece;

when the limiting piece is in a non-limiting state, the limiting piece is separated from the locking piece, and the user can manually rotate the operating piece to drive the locking piece to screw or unscrew around the axis direction.

Further, the limiting piece comprises a limiting plate, a rotating shaft and an elastic piece, wherein the rotating shaft is fixed on the blade support, the limiting plate can rotate around the rotating shaft, one end of the elastic piece is connected with the limiting plate, and the other end of the elastic piece is connected with the blade support;

when the limiting piece is in a limiting state, the limiting plate is matched and connected with the locking piece under the elastic action of the elastic piece;

when the limiting piece is in a non-limiting state, the limiting plate is separated from the locking piece under the action of overcoming the elastic force of the elastic piece under the manual pushing of a user.

Further, the limiting plate is provided with a clamping hook, the locking piece comprises a locking main body and a plurality of ratchets, the ratchets are circumferentially and uniformly distributed outside the locking main body at intervals, and clamping grooves are formed between adjacent ratchets;

when the limiting piece is in a limiting state, the clamping hook is positioned in the clamping groove and is abutted with the ratchet;

when the limiting piece is in a non-limiting state, the clamping hook is separated from the clamping groove.

Further, the ratchet is provided with a first wedge-shaped surface and a second wedge-shaped surface, the first wedge-shaped surface and the second wedge-shaped surface are inclined towards the unscrewing direction of the locking piece, and the clamping hook is provided with a third wedge-shaped surface and a fourth wedge-shaped surface;

when the limiting piece is in a limiting state and the locking piece is screwed clockwise, the first wedge-shaped surface of the ratchet wheel and the third wedge-shaped surface of the clamping hook are in butt joint and slide relatively, and the clamping hook is separated from the current clamping groove under the pushing of the ratchet wheel;

when the limiting piece is in a limiting state and unscrews the locking piece anticlockwise, the second wedge-shaped surface of the ratchet is abutted with the fourth wedge-shaped surface of the clamping hook, and the movement of the ratchet is blocked by the clamping hook.

Further, the limiting plate comprises a driving part and a matching part which are connected with each other, the elastic piece is fixedly connected with the driving part, and the clamping hook is fixed on the matching part.

Further, a rotating hole is formed in the limiting plate, the rotating hole is located between the driving part and the matching part, and the rotating shaft penetrates through the rotating hole.

Further, a clamping block is convexly arranged on the driving part, and one end of the elastic piece is sleeved on the clamping block.

Further, the driving part is convexly provided with a push button, and a user pushes the push button to overcome the elastic piece so that the clamping hook is separated from the locking piece.

Further, the locking piece is provided with a matching hole, and the inner wall forming the matching hole is in threaded connection with the bolt.

Further, a clamping hole is formed in the bottom wall of the matching hole, the operating piece is provided with a clamping foot, and the clamping foot is in butt joint with the bottom wall of the matching hole while being matched with the clamping hole.

An electric shears comprising:

a housing;

a blade assembly extending from a front end of the housing;

a bolt connected with the blade assembly;

the electric scissors further comprise the blade replacing device.

Further, the electric shears further comprise a blade support, the blade assembly comprises a static blade and a movable cutting assembly, the blade support is provided with a blade supporting portion located between the static blade and the locking piece, the blade supporting portion comprises a bottom main body, a boss and a limiting column, the boss is arranged on the bottom main body in a protruding mode, the static blade is sleeved with the boss, and the limiting column penetrates through the static blade.

Further, a limiting hole penetrating through the bottom main body and the boss is formed in the blade supporting portion, and the bolt penetrates through the limiting hole.

Further, the movable cutting assembly comprises a movable blade, a swinging tooth and a gasket, wherein the movable blade, the swinging tooth and the gasket are attached to the static blade, the bolt sequentially penetrates through the gasket, the swinging tooth and the movable blade, a connecting column is arranged on the gasket in a protruding mode, and the connecting column penetrates through the swinging tooth and the movable blade.

Further, the bolt comprises a flat plate part, a rotating part connected with the flat plate part, a combining part connected with the rotating part and a threaded part connected with the combining part, the movable blade, the swing tooth and the gasket are rotatably sleeved on the rotating part, the limiting hole is matched with the combining part to prevent the combining part from rotating, and the locking piece is in threaded connection with the threaded part.

Further, a first channel and a second channel are formed in the bolt, one end of the first channel extends to the top surface of the flat plate part to form an oil filling port, the other end of the first channel is communicated with one end of the second channel, the other end of the second channel extends to the outer side wall of the rotating part to form an oil outlet, and the joint of the movable blade and the static blade is aligned with the oil outlet.

Further, a blocking piece is arranged in the first channel, the blocking piece comprises a second spring and a second steel ball used for blocking the oil filling port, and one end of the second spring is in butt joint with the bottom wall forming the first channel, and the other end of the second spring is in butt joint with the second steel ball.

Further, the plugging piece further comprises a housing, the housing comprises a fitting part and a sealing cover part fixedly connected with the fitting part, the fitting part is in interference fit with the side wall forming the first channel, an opening for oiling is formed in the sealing cover part, and the second steel ball is in butt joint with the sealing cover part and used for plugging the opening.

Further, a mounting hole is formed in the machine shell, the locking piece penetrates through the mounting hole, the outer diameter of the locking piece is larger than the aperture of the mounting hole, and when the locking piece is separated from the bolt, the locking piece is abutted to the machine shell.

Compared with the prior art, the utility model has the advantages that:

1. when the blade is required to be replaced, the push Niu Shun is pushed clockwise by overcoming the elastic action of the elastic element, namely the push button rotates towards the direction close to the locking element, the limiting plate rotates around the rotating shaft to drive the clamping hook to be separated from the clamping groove of the locking element, then the operating element rotates to drive the locking element to rotate, the locking element rotates to be separated from the threaded part on the bolt, then the bolt and the gasket are sequentially pulled out, finally the movable blade is pulled out for replacement, and the rotating operating element drives the locking element to be matched with the bolt, the push button is not required to be pushed all the time, when the limiting element is in a limiting state, namely the clamping hook is positioned in the clamping groove, at the moment, the operating element is screwed clockwise, the operating element drives the locking element to rotate clockwise, at the moment, the first wedge surface of the ratchet is inclined towards the unscrewing direction of the locking element, namely the anticlockwise direction, and simultaneously slides relatively, and the clamping hook is separated from the current clamping groove under the pushing of the ratchet, but the clamping hook is made of the elastic material and enters the next clamping groove again, and the matching of the locking element and the bolt is completed in the state repeatedly; and when the limiting piece is in a limiting state and unscrews the locking piece anticlockwise, as the second wedge surface is inclined towards the anticlockwise direction, the second wedge surface of the ratchet is abutted with the fourth wedge surface of the clamping hook, and the anticlockwise movement of the ratchet enables the second wedge surface of the ratchet to slide to the corner of the clamping hook along the fourth wedge surface of the clamping hook, so that the movement of the ratchet is blocked by the clamping hook, and the locking piece cannot rotate anticlockwise, so that misoperation can be avoided. The blade replacing device is simple in structure, simple and convenient to operate when the blade is replaced, free of additional disassembling tools, safe and reliable.

2. When the retaining member breaks away from the bolt, because the external diameter of the retaining member is greater than the aperture of the mounting hole, ratchet on the retaining member is abutted with the casing, and the retaining member is prevented from falling to cause part loss.

3. A first channel and a second channel are formed in the first adapting piece, one end of the first channel extends to the top surface of the flat plate part to form an oil filling port, the other end of the first channel is communicated with one end of the second channel, the other end of the second channel extends to the outer side wall of the rotating part to form an oil outlet, and the joint of the movable blade and the static blade is aligned with the oil outlet. After the electric scissors are used for a long time, wheel lubricating oil can be injected into the oil injection port, and the wheel lubricating oil reaches the joint of the movable blade and the static blade after passing through the first channel and the second channel, so that the wheel lubricating effect of the blade is improved.

4. Through having the shutoff piece at first passageway embeds, the shutoff piece includes second spring and is used for shutoff oiling mouth's second steel ball, and second spring one end and the bottom surface wall butt that forms first passageway, the one side butt of the other end and second steel ball. When oiling is not needed, the second steel ball seals the opening under the action of the elasticity of the second spring, so that lubricating oil is prevented from leaking out.

Drawings

FIG. 1 is a schematic diagram of an electric scissors;

FIG. 2 is a schematic diagram of a second embodiment of an electric scissors;

FIG. 3 is a schematic view of a portion of an electric scissors;

FIG. 4 is a schematic diagram of a portion of an electric scissors;

FIG. 5 is a schematic view of a part of the structure of the electric shears;

FIG. 6 is an exploded view of the electric shears

FIG. 7 is a top view of the electric shears;

FIG. 8 is a cross-sectional view taken along line A-A of FIG. 7;

FIG. 9 is a schematic view of the blade assembly and screw configuration of the electric shears;

FIG. 10 is a schematic diagram of a part of the structure of the electric shears;

fig. 11 is a schematic diagram showing a partial structure of the electric scissors.

X, axis; 1. a housing; 10. a lower housing; 103. a mounting hole; 104. a sliding hole; 11. an upper housing; 2. a blade assembly; 20. a stationary blade; 200. a sixth hole; 201. a seventh hole; 21. a movable cutting assembly; 210. a movable blade; 217. a fourth hole; 218. a fifth hole; 211. swinging teeth; 215. a second hole; 216. a third hole; 219. a rack; 212. a gasket; 213. a connecting column; 214. a first hole; 3. a bolt; 30. a threaded portion; 31. a flat plate portion; 310. a top surface; 32. a rotating part; 320. an outer sidewall; 33. a joint; 330. a plane; 34. a first channel; 340. a bottom wall; 341. side walls; 35. a second channel; 36. an oil filling port; 37. an oil outlet; 9. a blocking member; 90. a second spring; 91. a second steel ball; 92. a housing; 920. a bonding part; 921. a cover part; 922. an opening; 8. a blade holder; 80. a blade support; 800. a bottom body; 801. a boss; 802. a limit column; 803. a limiting hole; 804. a cross-sectional plane; 805. a column; 7. a drive assembly; 70. a gear; 4. a locking member; 40. a locking body; 41. a ratchet; 410. a first wedge surface; 411. a second wedge surface; 42. a clamping groove; 43. a mating hole; 430. an inner wall; 431. a bottom wall; 44. a clamping hole; 5. an operating member; 50. a clamping foot; 6. a limiting piece; 60. a limiting plate; 600. a driving section; 601. a mating portion; 602. a turning hole; 603. a clamping block; 604. a push button; 605. a hook; 606. a third wedge surface; 607. a fourth wedge surface; 61. a rotating shaft; 62. an elastic member.

Detailed Description

The technical scheme of the utility model is further described in non-limiting detail below with reference to the preferred embodiments and the accompanying drawings. In the description of the present utility model, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. refer to the azimuth or positional relationship based on the azimuth or positional relationship shown in the drawings. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

As shown in fig. 1 to 5, in an embodiment of the present utility model, a blade replacing device for replacing a blade assembly 2 connected by a bolt 3 includes a locking member 4 screwed with the bolt 3 to fix the blade assembly 2, an operating member 5, and a stopper 6, a blade holder 8 is provided between the blade assembly 2 and the locking member 4, and the stopper 6 is provided at the blade holder 8 and is switchable between a stopped state and an unstopped state. When the limiting piece 6 is in a limiting state, the limiting piece 6 is matched with the locking piece 4, a user can manually rotate the operating piece 5 to drive the locking piece 4 to screw around the axis X, and the locking piece 4 unscrews around the axis X and is blocked by the limiting piece 6; when the limiting member 6 is in the non-limiting state, the limiting member 6 is separated from the locking member 4, and the user can manually rotate the operating member 5 to drive the locking member 4 to screw or unscrew around the axis X.

The locking member 4 and the operating member 5 may be two independent parts, and the locking member 4 and the operating member 5 may be integrally formed by detachably connecting them.

The locking member 4 comprises a locking main body 40 and a plurality of ratchets 41, wherein the ratchets 41 are circumferentially and uniformly distributed outside the locking main body 40 at intervals, a clamping groove 42 is formed between the adjacent ratchets 41, the ratchets 41 are provided with a first wedge-shaped surface 410 and a second wedge-shaped surface 411, and the first wedge-shaped surface 410 and the second wedge-shaped surface 411 are inclined towards the unscrewing direction of the locking member 4.

The locking member 4 is provided with a mating hole 43, and an inner wall 430 forming the mating hole 43 is screwed with the bolt 3.

The bottom wall 431 forming the mating hole 43 is provided with a clamping hole 44, the operating member 5 is provided with a clamping foot 50, and the clamping foot 50 and the clamping hole 44 are abutted with the bottom wall 431 of the mating hole 43 while being mated.

The limiting piece 6 comprises a limiting plate 60, a rotating shaft 61 and an elastic piece 62, wherein the rotating shaft 61 is fixed on the blade bracket 8, the limiting plate 60 can rotate around the rotating shaft 61, one end of the elastic piece 62 is connected with the limiting plate 60, and the other end of the elastic piece 62 is connected with the blade bracket 8. When the limiting piece 6 is in a limiting state, the limiting plate 60 is matched and connected with the locking piece 4 under the elastic action of the elastic piece 62; when the limiting member 6 is in the non-limiting state, the limiting plate 60 is separated from the locking member 4 against the elastic force of the elastic member 62 under the manual pushing of the user.

In this embodiment, the spindle 61 is a bolt, and the blade holder 8 is provided with a threaded hole (not shown) for dispensing with the spindle 61.

The limiting plate 60 comprises a driving part 600 and a matching part 601 which are connected with each other, the elastic piece 62 is fixedly connected with the driving part 600, a rotating hole 602 is formed in the limiting plate 60, the rotating hole 602 is located between the driving part 600 and the matching part 601, and the rotating shaft 61 passes through the rotating hole 602 and then enters into a threaded hole in the blade bracket 8 to be in threaded connection with the blade bracket 8, so that the limiting part 60 can pivot around the rotating shaft 61.

The limiting plate 60 is further provided with a hook 605, and the hook 605 is fixed on the mating portion 601. When the limiting piece 6 is in a limiting state, the clamping hook 605 is positioned in the clamping groove 42 and is abutted with the ratchet 41; when the limiting member 6 is in the non-limiting state, the hook 605 is separated from the clamping groove 42.

Referring to fig. 5, a clamping block 603 and a push button 604 are convexly disposed on the driving portion 600, one end of the elastic member 62 is sleeved on the clamping block 603, and under normal conditions, the limiting plate 60 moves the mating portion 601 towards a position close to the locking member 4 under the elastic force of the elastic member 62, so that the hook 605 on the mating portion 601 is located in the clamping groove 42; when the user pushes the push button 604 to rotate in a direction approaching the locking member 4, the elastic force of the elastic member 62 is overcome to disengage the hook 605 from the locking groove 42 of the locking member 4.

The hook 605 has a third wedge surface 606 and a fourth wedge surface 607, when the limiting piece 6 is in a limiting state and the locking piece 4 is screwed clockwise, the first wedge surface 410 of the ratchet 41 and the third wedge surface 606 of the hook 605 are in abutting joint and slide relatively, and the hook 605 is separated from the current clamping groove 42 under the pushing of the ratchet 41; when the stopper 6 is in the position-limited state and the locking member 4 is unscrewed counterclockwise, the second wedge surface 411 of the ratchet 41 abuts against the fourth wedge surface 607 of the hook 605, and the movement of the ratchet 41 is hindered by the hook 605.

As shown in fig. 6-8, the present embodiment further provides an electric scissors, including a housing 1, a blade assembly 2, a bolt 3, a blade support 8, a driving assembly 7, and the blade replacing device, wherein the blade assembly 2 extends from the front end of the housing 1, the bolt 3 is connected with the blade assembly 2, the blade replacing device is used for replacing the blade assembly 2 connected by the bolt 3, the blade support 8 and the driving assembly 7 are both disposed inside the housing 1, the driving assembly 7 can drive the blade assembly 2 to perform a cutting action, and the blade assembly 2 is detachably disposed on the blade support 8 through the blade replacing device.

The casing 1 includes an upper casing 11 and a lower casing 10 that are engaged with each other.

Referring to fig. 2, a mounting hole 103 and a sliding hole 104 are provided at the head of the lower housing 10, the locking member 4 is coupled with the bolt 3 through the mounting hole 103, when the locking member 4 is separated from the bolt 3, the ratchet 41 on the locking member 4 abuts against the housing 1, so as to avoid the loss of parts caused by falling of the locking member 4, at least part of the push button 604 passes through the sliding hole 104 and is exposed at the outer side of the housing 1, and the push button 604 can slide back and forth along the direction of the sliding hole 104. Specifically, the outer diameter of the locking member 4 is larger than the aperture of the mounting hole 103, so when the locking member 4 is disengaged from the bolt 3, even if the locking member 4 is dropped due to gravity, since the outer diameter of the locking member 4 is larger than the aperture of the mounting hole 103, the locking member 4 is dropped to abut against the casing 1 where the mounting hole 103 is located, and the casing 1 prevents the dropping of the locking member 4.

As shown in fig. 9, the blade assembly 2 includes a stationary blade 20 and a movable cutting assembly 21, and the driving assembly 7 is used for driving the movable cutting assembly 21 to swing back and forth, and the movable cutting assembly 21 in a swinging state and the stationary blade 20 in a stationary state accompany each other to realize a cutting function.

The movable cutting assembly 21 comprises a movable blade 210, a swinging tooth 211 and a gasket 212, which are attached to the static blade 20, the bolt 3 sequentially passes through the gasket 212, the swinging tooth 211 and the movable blade 210, a connecting column 213 is convexly arranged on the gasket 212, and the connecting column 213 passes through the swinging tooth 211 and the movable blade 210. Specifically, the spacer 212 is provided with a first hole 214, the oscillating tooth 211 is provided with a second hole 215 and a third hole 216, the movable blade 210 is provided with a fourth hole 217 and a fifth hole 218, the connecting column 213 on the spacer 212 sequentially passes through the third hole 216 of the oscillating tooth 211 and the fifth hole 218 of the movable blade 210, and when the driving assembly 7 drives the oscillating tooth 211 to oscillate back and forth, the oscillating tooth 211 drives the movable blade 210 and the spacer 212 to oscillate synchronously through the connecting column 213.

The bolt 3 sequentially passes through the first hole 214 on the spacer 212, the second hole 215 on the oscillating tooth 211 and the fourth hole 217 on the movable blade 210, and the movable blade 210, the oscillating tooth 211 and the spacer 212 can oscillate back and forth around the bolt 3.

As shown in fig. 10, a rack 219 is further disposed on the oscillating tooth 211, the rack 219 is meshed with the gear 70 on the driving assembly 7, the rotating gear 70 can drive the oscillating tooth 211 to oscillate back and forth around the bolt 3, the oscillating tooth 211 in the oscillating state drives the spacer 212 and the movable blade 210 to oscillate synchronously through the connecting column 213, and the movable blade 210 in the oscillating state cooperates with the static blade 20 in the static state to realize the shearing function.

As shown in fig. 11, the stationary blade 20 is provided with a sixth hole 200 and a seventh hole 201.

The blade holder 8 has a blade support portion 80 located between the stationary blade 20 and the second adapter 4, the blade support portion 80 includes a bottom main body 800, a boss 801 and a limiting post 802 protruding on the bottom main body 800, the stationary blade 20 is sleeved on the boss 801 through the sixth hole 200, the limiting post 802 passes through the seventh hole 201 of the stationary blade 20, so that the stationary blade 20 is ensured to be stationary with respect to the blade holder 8, and a limiting hole 803 penetrating the bottom main body 800 and the boss 801 is formed in the blade support portion 80, the first adapter 3 passes through the limiting hole 803, and the first adapter 3 is non-rotatable with respect to the limiting hole 803.

Specifically, the limiting hole 803 has therein a cross-sectional plane 804 that limits the rotation of the first adapter 3.

The blade bracket 8 is also provided with a stand column 805 in a protruding way, and one end of the elastic piece 62 is sleeved on the stand column 805.

As shown in fig. 7 to 9, the first coupling member 3 includes a flat plate portion 31, a rotating portion 32 connected to the flat plate portion 31, a coupling portion 33 connected to the rotating portion 32, and a screw portion 30 connected to the coupling portion 33, the movable blade 210, the oscillating tooth 211, and the spacer 212 are rotatably coupled to the rotating portion 32, the limiting hole 803 is coupled to the coupling portion 33 to prevent the coupling portion 33 from rotating, specifically, a flat surface 330 on the coupling portion 33 is engaged with a cross-sectional surface 804, and an inner wall 430 of the locking member 4 forming the coupling hole 43 is screw-coupled to the screw portion 30.

The first adapting piece 3 is internally provided with a first channel 34 and a second channel 35, one end of the first channel 34 extends to the top surface 310 of the flat plate part 31 to form an oil filling port 36, the other end of the first channel is communicated with one end of the second channel 35, the other end of the second channel 35 extends to the outer side wall 320 of the rotating part 32 to form an oil outlet 37, and the joint of the movable blade 210 and the static blade 20 is aligned with the oil outlet 37. The first channel 34 is internally provided with a blocking piece 9, the blocking piece 9 comprises a second spring 90 and a second steel ball 91 for blocking the oil filling port 36, one end of the second spring 90 is abutted with a bottom wall 340 forming the first channel 34, and the other end is abutted with the second steel ball 91.

The plugging member 9 further includes a housing 92, where the housing 92 includes a fitting portion 920 and a cover portion 921 fixedly connected to the fitting portion 920, the fitting portion 920 is in interference fit with a side wall 341 forming the first channel 34, an opening 922 for injecting oil is formed in the cover portion 921, and the other side of the second steel ball 91 is abutted to the cover portion 921 for plugging the opening 922. When oil injection is not needed, the second steel ball 91 seals the opening 922 under the action of the elasticity of the second spring 90, so that lubricating oil is prevented from leaking out; when oiling is needed, the oiling nozzle overcomes the elastic force of the second spring 90 to press the second steel ball 91 to expose the opening 922, and the lubricating oil sequentially passes through the first channel 34 and the second channel 35 from the opening 922 and finally flows out from the oil outlet 37 to the joint of the movable blade 210 and the static blade 20, so that the lubricating effect of the blade is improved.

When the blade needs to be replaced, referring to fig. 5, the push button 604 needs to be pushed clockwise against the elastic force of the elastic member 62, that is, the push button 604 rotates towards the direction approaching to the locking member 4, the limiting plate 60 rotates around the rotating shaft 61 to drive the hook 605 to be disengaged from the slot 42 of the locking member 4, then the operating member 5 rotates to drive the locking member 4 to rotate, the locking member 4 rotates to be separated from the threaded portion 30 on the bolt 3, then the bolt 3 and the gasket 212 are sequentially pulled out, and finally the movable blade 210 is pulled out for replacement.

After the movable blade 210 is replaced, the gasket 212 and the bolt 3 are sequentially and originally installed; aligning the mating hole 43 on the locking member 4 and the threaded portion 30 on the bolt 3, rotating the operating member 5 in the opposite direction, the operating member 5 rotates the locking member 4 until the locking member 4 abuts against the blade holder 8, then releasing the push button 604, and returning the hook 605 back to the catch groove 42 under the elastic force of the elastic member 62.

It should be noted that, in the process of rotating the operating member 5 to drive the locking member 4 to be engaged with the bolt 3, there is no need to push the button 604, when the limiting member 6 is in the limiting state, i.e. the hook 605 is located in the clamping groove 42, please refer to fig. 3, at this time, the operating member 5 is screwed clockwise to drive the locking member 4 to rotate clockwise, at this time, since the first wedge surface 410 is inclined towards the unscrewing direction of the locking member 4, i.e. anticlockwise direction, the first wedge surface 410 of the ratchet 41 and the third wedge surface 606 of the hook 605 relatively slide while abutting, and the hook 605 is separated from the current clamping groove 42 under the pushing of the ratchet 41, but since the hook 605 itself is made of an elastic material, the hook 605 enters the next clamping groove 42, and one of repeating this state completes the engagement of the locking member 4 with the bolt 3.

When the limiting member 6 is in a limiting state and the locking member 4 is unscrewed anticlockwise, since the second wedge surface 411 is inclined towards the unscrewing direction of the locking member 4, that is, anticlockwise, the second wedge surface 411 of the ratchet 41 is abutted against the fourth wedge surface 607 of the hook 605, and anticlockwise movement of the ratchet 41 enables the second wedge surface 411 of the ratchet 41 to slide towards the corner of the hook 605 along the fourth wedge surface 607 of the hook 605, so that movement of the ratchet 41 is hindered by the hook 605, and the locking member 4 cannot rotate anticlockwise, thereby avoiding misoperation.

The blade replacing device has the advantages of simple structure, simple and convenient operation during blade replacement, no need of using additional dismounting tools, safety and reliability, and can avoid the loss of the dismounted parts.

The foregoing examples illustrate only a few embodiments of the utility model and are described in detail herein without thereby limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (19)

1. Blade replacing device for replacing a blade assembly (2) connected by a bolt (3), characterized in that the blade replacing device comprises a locking member (4), an operating member (5) and a limiting member (6) which are in threaded connection with the bolt (3) to fix the blade assembly (2), a blade support (8) is arranged between the blade assembly (2) and the locking member (4), and the limiting member (6) is arranged on the blade support (8) and can be switched between a limiting state and a non-limiting state;

when the limiting piece (6) is in a limiting state, the limiting piece (6) is matched with the locking piece (4), a user can manually rotate the operating piece (5) to drive the locking piece (4) to screw around the axis (X), and the locking piece (4) is unscrewed around the axis (X) and is blocked by the limiting piece (6);

when the limiting piece (6) is in an unlimiting state, the limiting piece (6) is separated from the locking piece (4), and a user can manually rotate the operating piece (5) to drive the locking piece (4) to be screwed or unscrewed around the axis (X).

2. The blade replacing device according to claim 1, wherein the limiting member (6) comprises a limiting plate (60), a rotating shaft (61) and an elastic member (62), the rotating shaft (61) is fixed on the blade holder (8), the limiting plate (60) is rotatable around the rotating shaft (61), and one end of the elastic member (62) is connected with the limiting plate (60) and the other end is connected with the blade holder (8);

when the limiting piece (6) is in a limiting state, the limiting plate (60) is matched and connected with the locking piece (4) under the elastic action of the elastic piece (62);

when the limiting piece (6) is in an unlimiting state, the limiting plate (60) is separated from the locking piece (4) under the action of the elastic force of the elastic piece (62) under the manual pushing of a user.

3. The blade replacing device according to claim 2, wherein the limiting plate (60) is provided with a clamping hook (605), the locking piece (4) comprises a locking main body (40) and a plurality of ratchets (41), the ratchets (41) are circumferentially and uniformly distributed outside the locking main body (40) at intervals, and clamping grooves (42) are formed between adjacent ratchets (41);

when the limiting piece (6) is in a limiting state, the clamping hook (605) is positioned in the clamping groove (42) and is abutted with the ratchet teeth (41);

when the limiting piece (6) is in a non-limiting state, the clamping hook (605) is separated from the clamping groove (42).

4. A blade replacing device according to claim 3, wherein the ratchet (41) has a first wedge surface (410) and a second wedge surface (411), the first wedge surface (410) and the second wedge surface (411) both being inclined towards the unscrewing direction of the locking member (4), the hook (605) having a third wedge surface (606) and a fourth wedge surface (607);

when the limiting piece (6) is in a limiting state and the locking piece (4) is screwed clockwise, the first wedge-shaped surface (410) of the ratchet (41) and the third wedge-shaped surface (606) of the clamping hook (605) are in butt joint and slide relatively, and the clamping hook (605) is separated from the clamping groove (42) at present under the pushing of the ratchet (41);

when the limiting piece (6) is in a limiting state and the locking piece (4) is unscrewed anticlockwise, the second wedge-shaped surface (411) of the ratchet (41) is abutted with the fourth wedge-shaped surface (607) of the clamping hook (605), and the movement of the ratchet (41) is blocked by the clamping hook (605).

5. A blade replacing device according to claim 3, wherein the limiting plate (60) comprises a driving part (600) and a mating part (601) which are connected with each other, the elastic member (62) is fixedly connected with the driving part (600), and the hook (605) is fixed on the mating part (601).

6. The blade replacing device according to claim 5, wherein a rotation hole (602) is formed in the limiting plate (60), the rotation hole (602) is located between the driving portion (600) and the mating portion (601), and the rotation shaft (61) passes through the rotation hole (602).

7. The blade replacing device according to claim 5, wherein a clamping block (603) is convexly arranged on the driving part (600), and one end of the elastic piece (62) is sleeved on the clamping block (603).

8. The blade replacing device according to claim 5, wherein the driving portion (600) is provided with a push button (604) in a protruding manner, and a user pushes the push button (604) to disengage the hook (605) from the locking member (4) against the elastic member (62).

9. Blade replacing device according to claim 1, characterized in that the locking member (4) is provided with a mating hole (43), and that an inner wall (430) forming the mating hole (43) is in threaded connection with the bolt (3).

10. The blade replacing device according to claim 9, wherein a clamping hole (44) is formed in a bottom wall (431) forming the mating hole (43), the operating member (5) is provided with a clamping foot (50), and the clamping foot (50) and the clamping hole (44) are abutted against the bottom wall (431) of the mating hole (43) while being mated.

11. An electric shears comprising:

a housing (1);

a blade assembly (2) extending from a front end of the housing (1);

a bolt (3) connected to the blade assembly (2);

the electric shears according to any one of claims 1 to 10 further comprising a blade changing device.

12. The electric shears according to claim 11, further comprising a blade holder (8), the blade assembly (2) comprising a stationary blade (20) and a movable cutting assembly (21), the blade holder (8) having a blade support (80) between the stationary blade (20) and the locking member (4), the blade support (80) comprising a bottom body (800) and a boss (801) and a limiting post (802) protruding on the bottom body (800), the stationary blade (20) being sleeved on the boss (801), and the limiting post (802) passing through the stationary blade (20).

13. The electric shears according to claim 12, wherein the blade supporting portion (80) is provided with a limiting hole (803) penetrating the bottom body (800) and the boss (801), and the bolt (3) passes through the limiting hole (803).

14. The electric shears according to claim 13, wherein the movable cutting assembly (21) comprises a movable blade (210), a swinging tooth (211) and a gasket (212) which are attached to the static blade (20), the bolt (3) sequentially penetrates through the gasket (212), the swinging tooth (211) and the movable blade (210), a connecting column (213) is convexly arranged on the gasket (212), and the connecting column (213) penetrates through the swinging tooth (211) and the movable blade (210).

15. The electric shears according to claim 14, wherein the bolt (3) includes a flat plate portion (31), a rotating portion (32) connected to the flat plate portion (31), a coupling portion (33) connected to the rotating portion (32), and a screw portion (30) connected to the coupling portion (33), the movable blade (210), the swing tooth (211), and the washer (212) are rotatably sleeved on the rotating portion (32), the limiting hole (803) is coupled to the coupling portion (33) to prevent the coupling portion (33) from rotating, and the locking member (4) is screw-coupled to the screw portion (30).

16. The electric shears according to claim 15, wherein a first channel (34) and a second channel (35) are formed in the bolt (3), one end of the first channel (34) extends to the top surface (310) of the flat plate portion (31) to form an oil filling port (36), the other end of the first channel is communicated with one end of the second channel (35), the other end of the second channel (35) extends to the outer side wall (320) of the rotating portion (32) to form an oil outlet (37), and the joint of the movable blade (210) and the static blade (20) is aligned with the oil outlet (37).

17. The electric shears according to claim 16, wherein the first passage (34) has a blocking member (9) built therein, the blocking member (9) including a second spring (90) and a second steel ball (91) for blocking the oil filling port (36), one end of the second spring (90) being abutted against a bottom surface wall (340) forming the first passage (34), and the other end being abutted against the second steel ball (91).

18. The electric shears according to claim 17, wherein the blocking member (9) further comprises a housing (92), the housing (92) comprises a fitting portion (920) and a cover portion (921) fixedly connected to the fitting portion (920), the fitting portion (920) is in interference fit with a side wall (341) forming the first channel (34), an opening (922) for filling oil is formed in the cover portion (921), and the second steel ball (91) and the cover portion (921) are abutted to block the opening (922).

19. The electric shears according to claim 11, wherein a mounting hole (103) is provided in the casing (1), the locking member (4) passes through the mounting hole (103), the outer diameter of the locking member (4) is larger than the aperture of the mounting hole (103), and when the locking member (4) is separated from the bolt (3), the locking member (4) abuts against the casing (1).