CN216982700U - Pruning scissors convenient to quick replacement blade - Google Patents

Abstract

The utility model discloses pruning shears convenient for quickly replacing blades, which comprise an eccentric wheel, blades and a bottom plate, wherein the blades are fixedly arranged on the bottom plate, the lower surface of the eccentric wheel is provided with a bulge, the bulge is provided with a first bearing, the bottom plate is provided with a positioning groove, and the first bearing is in interference fit with the positioning groove. When the tool is used for replacing, the blade and the bottom plate are directly replaced together, and tools are not needed for dismounting the blade, so that the assembly difficulty is greatly reduced; in addition, the bulges are rotatably connected relative to the bottom plate, the positioning grooves have a limiting effect on the eccentric wheel along the radial direction through the bulges, so that the eccentric wheel is rotatably connected with the positioning grooves through the bearings, good positioning is achieved, the front and back displacement or swinging of the eccentric wheel relative to the blade is avoided, the eccentric wheel can be directly aligned with the large gear to be in splined connection, and the assembling efficiency is improved.

Description

Pruning scissors convenient to quick replacement blade

Technical Field

The utility model belongs to the field of garden electric tool equipment, and particularly relates to pruning shears convenient for quickly replacing blades.

Background

The pruning shears are used for pruning branches or scapes, are commonly used garden electric tools and comprise a driving mechanism, a large gear, an eccentric wheel and a blade assembly, wherein the driving mechanism drives the large gear to rotate through a small gear at an output end, the large gear drives the eccentric wheel to rotate, and the eccentric wheel drives a blade on the blade assembly to do reciprocating motion so as to realize the pruning function. Can cut the metal of stereoplasm etc. and can damage the blade in the work, the blade needs to be changed after the blade damages, an subassembly has generally been made with eccentric wheel and gear wheel among the prior art, lead to assembling blade subassembly toward the eccentric wheel when changing the blade, just can realize the assembly in the U type groove on the blade subassembly owing to the eccentric block that needs the eccentric wheel aims at the eccentric wheel, if the blade subassembly is upper and lower double linkage, that just need will join in marriage the U type groove of blade about the upper and lower eccentric block alignment of eccentric wheel simultaneously, the degree of difficulty improves more, it is poor to experience when leading to the user to change, a hand oil during the installation, blade subassembly and complete machine are bolted connection simultaneously, the customer needs the removable blade subassembly of specific instrument.

A small part of manufacturers can design the eccentric wheel and the large gear into a split structure, and the eccentric wheel and the large gear are connected through splines, so that the eccentric wheel can be taken down, the eccentric wheel is assembled on the blade assembly, and then the assembled eccentric wheel and the blade assembly are assembled with the large gear. However, before the eccentric wheel and the large gear are assembled, the eccentric wheel may shift relative to the blade, so that the eccentric wheel cannot be aligned. In addition, the knife box is used for placing the knife blade in the prior art, when the knife blade is replaced, a plurality of screws are required to be screwed by using tools to realize the dismounting of the knife blade assembly and the knife box, the convenience is not high enough, and certain difficulty is provided for common consumers.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide pruning shears facilitating blade replacement, which can effectively solve the problem that an eccentric wheel which is designed separately from a large gear is easy to shift back and forth when being assembled with a blade assembly in the prior art, and further reduce the assembly difficulty of the eccentric wheel and the large gear.

In order to solve the technical problems, the utility model adopts the following technical scheme: the utility model provides a pruning scissors convenient to quick replacement blade, includes eccentric wheel and blade, still includes the bottom plate, blade fixed mounting is on the bottom plate, the lower surface of eccentric wheel is equipped with the arch, be equipped with first bearing in the arch, be equipped with the locating hole on the bottom plate, first bearing and locating hole interference fit.

Preferably, the pruning shears further comprise a gear box, a positioning shaft is fixedly arranged on the gear box, a large gear is connected to the positioning shaft in a rotating mode, and a first through hole for the positioning shaft to penetrate through is formed in the center of the eccentric wheel. Through set up the first through-hole that supplies the location axle to pass on the eccentric wheel, when assembling eccentric wheel and gear wheel, the accessible is aimed at location axle and is realized quick location with the locating piece, only needs during the operation to put in place along the bottom plate of location axle promotion, can make eccentric wheel and gear wheel realize splined connection, has further reduced the operation degree of difficulty.

Preferably, the protrusion is provided with a third through hole communicated with the first through hole, the bottom of the positioning hole is provided with a fourth through hole penetrating through the bottom plate, the positioning shaft sequentially penetrates through the first through hole, the third through hole and the fourth through hole and extends out of the bottom plate, the pruning shear further comprises a bottom cover, and one end part of the positioning shaft extending out of the bottom plate is in threaded connection with the bottom cover. The positioning shaft can penetrate through the eccentric wheel, the protrusion and the positioning hole (namely the bottom plate), one end of the positioning shaft penetrates out of the lower surface of the bottom plate, the bottom cover is arranged, the bottom cover is in threaded connection with the positioning shaft, and therefore after the bottom plate is used for driving the blade, the eccentric wheel and the gear wheel to be assembled in place, the bottom cover can be in threaded connection with the positioning shaft, the bottom plate, the blade and the eccentric wheel are further fixed on the gear wheel, extra tools are not needed, and the operation difficulty is further reduced.

Preferably, the bottom cover is provided with a mounting groove, a nut is fixedly arranged in the mounting groove, an external thread is arranged at the end part of the positioning shaft, which extends out of the bottom plate, and the bottom cover is in threaded connection with the positioning shaft through the nut. On one hand, because the bottom cover is generally made of light hard plastic materials, the bottom cover is easy to grind and lose efficacy after being provided with the internal thread for a plurality of screwing times; on the other hand, if the internal thread is arranged on the bottom cover, the bottom cover needs to have certain thickness, the weight of the bottom cover needs to be increased, namely the weight of the whole machine is increased, and therefore the problem can be avoided by installing the nut on the bottom cover.

Preferably, the lower surface of the bottom cover is provided with a lightening groove, and a reinforcing rib convenient for screwing and grabbing is arranged in the lightening groove. On one hand, the hair is convenient to hold, and on the other hand, the hair can be lightened.

Preferably, the gear box is fixedly provided with a limiting column, and the bottom plate is provided with a limiting hole for the limiting column to pass through. The auxiliary positioning and guiding function is achieved, the alignment operation during assembly is more convenient, and the convenience of the assembly process is further improved.

Preferably, the eccentric wheel is connected with a gear wheel through a spline, one of the eccentric wheel and the gear wheel is provided with an internal spline, and the other one of the eccentric wheel and the gear wheel is provided with an external spline.

Preferably, the end part, facing the inner spline, of the outer spline is provided with a first guide arc surface, the end part, facing the outer spline, of the inner spline is provided with a second guide arc surface, and the first guide arc surface and the second guide arc surface are matched to guide the outer spline to automatically slide into the inner spline. Through setting up first direction cambered surface and the second direction cambered surface of mutually supporting, in the eccentric wheel to gear wheel assembling process, when external splines and internal spline relatively slide to the contact, accessible direction cambered surface guide eccentric wheel is automatic to rotate and slide in the internal spline to the external spline.

Preferably, the bull gear is provided with a second through hole, the lower section of the second through hole is provided with the internal spline, the upper section of the second through hole is in interference fit with a second bearing, and the bull gear is rotatably connected with the positioning shaft through the second bearing. The inner spline is arranged on the big gear, and the outer spline is correspondingly arranged on the eccentric wheel, so that the first through hole arranged in the center of the eccentric wheel and the outer spline are not influenced with each other; the gear wheel is provided with an internal spline, and the second through hole is correspondingly required to be formed, so that the second through hole can also be used for mounting a second bearing, and further the relative rotation of the gear wheel and the positioning shaft is realized.

Preferably, the first bearing is a needle bearing, an outer ring of the first bearing is in interference fit with the positioning hole, and an inner ring of the first bearing is in interference fit with the protrusion.

Compared with the prior art, the utility model has the following beneficial effects: the structure that uses the sword box to place the blade among the change prior art, design a bottom plate, directly leave the factory with blade and bottom plate fixed connection good, directly change blade and bottom plate together during the change, need not the use tools and carry out the dismouting operation of blade, greatly reduced the assembly degree of difficulty. The lower surface of the eccentric wheel is additionally provided with a bulge, the bulge is provided with a bearing, the bottom plate is provided with a positioning hole, and the bearing is in interference fit with the positioning hole, so that the eccentric wheel is rotatably connected with the positioning hole through the bearing, good positioning is achieved, the front and back displacement or shaking relative to the blade is avoided, the eccentric wheel can be directly aligned with the large gear to be in spline connection, and the assembly efficiency is improved.

Drawings

FIG. 1 is an exploded view of a pair of pruning shears with blades that are easily and quickly replaced according to embodiments of the present invention;

FIG. 2 is a cross-sectional view of a pair of pruning shears facilitating quick blade change according to embodiments of the present invention;

FIG. 3 is a schematic view of an eccentric wheel and a blade assembly in the embodiment;

FIG. 4 is a schematic structural view of the eccentric wheel in the embodiment;

FIG. 5 is a schematic view showing the connection of the eccentric to the base plate in the embodiment;

FIG. 6 is a schematic view of the bull gear in the embodiment;

fig. 7 is a schematic view of the bottom cover in the embodiment.

Wherein: 1. the driving motor, 10, a pinion, 2, a gearwheel, 20, an internal spline, 200, a second guiding arc surface, 21, a second through hole, 210, a second bearing, 3, an eccentric wheel, 30, an eccentric block, 31, a first through hole, 32, a bulge, 320, a first bearing, 321, a third through hole, 33, an external spline, 330, a first guiding arc surface, 4, a blade, 5, a bottom plate, 50, a positioning hole, 51, a fourth through hole, 52, a limiting hole, 6, a gear box, 60, a positioning shaft, 7, a bottom cover, 70, a mounting groove, 71, a nut, 72, a weight reduction groove and 73 reinforcing ribs.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are illustrative and intended to explain the present invention and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the terms "mounted," "connected," "secured," and the like are to be construed broadly and may include, for example, fixed connections, removable connections, or integral parts; may be mechanically coupled, may be electrically coupled or may be in communication with each other; may be directly connected or indirectly connected through an intermediate, unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Example (b): the embodiment provides a pruning scissors convenient to quick replacement blade, as shown in fig. 1 and 2, including driving motor 1, this driving motor 1's below is equipped with gear box 6, is equipped with the driven pinion 10 of intermeshing and gear wheel 2 on the gear box 6, and wherein driving motor 1's output shaft and pinion 10 fixed connection, driving motor 1 can drive pinion 10 and rotate like this, and then drives gear wheel 2 through gear drive and rotate. The eccentric wheel 3 is connected with below the gear wheel 2, and eccentric wheel 3 includes eccentric block 30, and gear wheel 2 drives eccentric wheel 3 and rotates, and eccentric block 30 drives blade 4 and is reciprocating motion, and above-mentioned structure belongs to prior art, and its theory of operation is no longer repeated. The pruning shears provided by the embodiment further comprise a base plate 5, the blade 4 is fixedly mounted on the base plate 5 when leaving the factory, as shown in fig. 3, 4 and 5, the lower surface of the eccentric wheel 3 is further provided with a protrusion 32, the protrusion 32 is provided with a first bearing 320, the base plate 5 is provided with a positioning hole 50, the first bearing 320 is in interference fit with the positioning hole 50, specifically, the first bearing 320 in the embodiment is a needle bearing, the outer ring of the first bearing 320 is in interference fit with the positioning hole 50, and the inner ring of the first bearing 320 is in interference fit with the protrusion 32. This pruning scissors that this embodiment provided also changes the structure that uses the sword box to place blade 4 among the prior art, designs a bottom plate 5, directly leaves the factory with blade 4 and 5 fixed connection of bottom plate good, directly changes blade 4 and bottom plate 5 together during the change, need not use tools to carry out the dismouting operation of blade 4, greatly reduced the assembly degree of difficulty. The lower surface of the eccentric wheel 3 is additionally provided with the bulge 32, the bulge 32 is provided with the bearing, the bottom plate 5 is provided with the positioning hole 50, and the bearing is in interference fit with the positioning hole 50, so that the eccentric wheel 3 is rotatably connected with the positioning hole 50 through the bearing, the positioning hole 50 has a limiting effect on the eccentric wheel 3 along the radial direction through the bulge 32, the eccentric wheel 3 is well positioned, the front and back displacement or shaking relative to the blade 4 can not occur, the eccentric wheel can be directly aligned with the large gear 2 for spline connection, and the assembly efficiency is improved.

In the present embodiment, the eccentric wheel 3 is in spline connection with the large gear 2, and one of the eccentric wheel 3 and the large gear 2 may be provided with an internal spline 20, and the other may be provided with an external spline 33, specifically, in the present embodiment, as shown in fig. 4 and 6, the external spline 33 is provided on the eccentric wheel 3, and the internal spline 20 is provided on the large gear 2. In this embodiment, a positioning shaft 60 is further fixedly arranged on the gear box 6, the large gear 2 is rotatably connected to the positioning shaft 60, a first through hole 31 for the positioning shaft 60 to pass through is further formed in the center of the eccentric wheel 3, the first through hole 31 for the positioning shaft 60 to pass through is formed in the eccentric wheel 3, when the eccentric wheel 3 and the large gear 2 are assembled, the positioning shaft 60 and the positioning block can be aligned to achieve quick positioning through aligning, the bottom plate 5 only needs to be pushed to be in place along the positioning shaft 60 during operation, the eccentric wheel 3 and the large gear 2 can be in splined connection, and the operation difficulty is further reduced. As shown in fig. 6, the specific arrangement of the internal splines 20 on the bull gear 2 in this embodiment is described as follows: the bull gear 2 is provided with a second through hole 21, the lower section of the second through hole 21 is provided with an internal spline 20, the upper section of the second through hole 21 is in interference fit with a second bearing 210, and the bull gear 2 is rotatably connected with the positioning shaft 60 through the second bearing 210. The inner spline 20 is arranged on the big gear 2, and the outer spline 33 is correspondingly arranged on the eccentric wheel 3, so that the first through hole 31 arranged in the center of the eccentric wheel 3 and the outer spline 33 are not influenced with each other; the gearwheel 2 is provided with an internal spline 20 and a corresponding second through hole 21 which needs to be formed, so that the second through hole 21 can also be used for mounting a second bearing 210, and further the relative rotation of the gearwheel 2 and the positioning shaft 60 is realized.

In order to solve the problem that the alignment of the internal spline and the external spline cannot be seen by the operator during assembly, although the positioning shaft 60 can be used for positioning and guiding during assembly, when the external spline 33 on the eccentric wheel 3 slides towards the internal spline 20 on the large gear 2, the external spline 33 may not be aligned with the internal spline 20, so that the external spline 33 cannot slide smoothly, as shown in fig. 4 and 6, a first guide arc surface 330 is further provided at one end of the external spline 33 towards the internal spline 20, a second guide arc surface 200 is provided at one end of the internal spline 20 towards the external spline 33, and the first guide arc surface 330 is matched with the second guide arc surface 200 for guiding the external spline 33 to automatically slide into the internal spline 20. By arranging the first guiding arc surface 330 and the second guiding arc surface 200 which are matched with each other, when the external spline 33 and the internal spline 20 relatively slide to contact in the process of assembling the eccentric wheel 3 to the gearwheel 2, the eccentric wheel 3 can be guided by the guiding arc surfaces to automatically rotate until the external spline 33 slides into the internal spline 20.

Further, as shown in fig. 1, fig. 2, fig. 4, fig. 5 and fig. 7, in order to reduce the use of tools in the assembling process, in this embodiment, a third through hole 321 communicated with the first through hole 31 is further disposed on the protrusion 32, a fourth through hole 51 penetrating through the base plate 5 is disposed at the bottom of the positioning hole 50, that is, the positioning hole 50 and the fourth through hole 51 form a step hole together, the positioning shaft 60 sequentially penetrates through the first through hole 31, the third through hole 321 and the fourth through hole 51 and extends out of the base plate 5, the pruning shear further includes a bottom cover 7, and an end portion of the positioning shaft 60 extending out of the base plate 5 is in threaded connection with the bottom cover 7. Thus, the positioning shaft 60 can penetrate through the eccentric wheel 3, the protrusion 32 and the positioning hole 50 (namely, the bottom plate 5), one end of the positioning shaft 60 penetrates out of the lower surface of the bottom plate 5, the bottom cover 7 is arranged, and the bottom cover 7 is in threaded connection with the positioning shaft 60, so that after the bottom plate 5 is used for driving the blade 4, the eccentric wheel 3 and the gear wheel 2 to be assembled in place, the bottom cover 7 can be in threaded connection with the positioning shaft 60, the bottom plate 5, the blade 4 and the eccentric wheel 3 are further fixed on the gear wheel 2, no additional tool is needed, and the operation difficulty is further reduced. It will be appreciated that in other embodiments, the bottom cover 7 may be connected to the gear housing 6 by screws, so that the third through hole 321 and the fourth through hole 51 do not need to be formed, i.e. the positioning shaft 60 does not need to extend out of the bottom plate 5, thereby adding a step of screwing screws during assembly.

In this embodiment, the bottom cover 7 is provided with an installation groove 70, a nut 71 is fixedly arranged in the installation groove 70, an external thread is formed on an end portion of the positioning shaft 60 extending out of the bottom plate 5, and the bottom cover 7 is in threaded connection with the positioning shaft 60 through the nut 71. The nut 71 is arranged on the bottom cover 7, and the bottom cover 7 is not directly provided with the internal thread, on one hand, the structure of the bottom cover 7 is generally made of light hard plastic materials, and the bottom cover is easy to be ground and fail after the internal thread is arranged and screwed for a plurality of times; on the other hand, if the bottom cover 7 is provided with the internal thread, the bottom cover 7 needs to have a certain thickness, and the weight of the bottom cover 7, namely the weight of the whole machine, needs to be increased, so that the problem can be avoided by installing the nut 71 on the bottom cover 7. Furthermore, a lightening groove 72 is formed in the lower surface of the bottom cover 7, a reinforcing rib 73 convenient for screwing and grasping is arranged in the lightening groove 72, and the lower end face of the reinforcing rib 73 is flush with the lower surface of the screw cover. On one hand, the hair is convenient to hold, and on the other hand, the hair can be lightened.

In this embodiment, a limiting post is further fixed on the gear box 6, and a limiting hole 52 for the limiting post to pass through is formed in the bottom plate 5. The auxiliary positioning and guiding function is achieved, the alignment operation during assembly is more convenient, and the convenience of the assembly process is further improved.

The above are only embodiments of the present invention, but the technical features of the present invention are not limited thereto, and any changes or modifications within the field of the present invention by those skilled in the art are covered by the claims of the present invention.

Claims (10)

1. The utility model provides a pruning scissors convenient to quick replacement blade, includes eccentric wheel (3) and blade (4), its characterized in that: still include bottom plate (5), blade (4) fixed mounting is on bottom plate (5), the lower surface of eccentric wheel (3) is equipped with arch (32), be equipped with first bearing (320) on arch (32), be equipped with locating hole (50) on bottom plate (5), first bearing (320) and locating hole (50) interference fit.

2. The pruning shears facilitating quick blade change as claimed in claim 1, wherein: the pruning shears further comprise a gear box (6), a positioning shaft (60) is fixedly arranged on the gear box (6), a large gear (2) is rotatably connected onto the positioning shaft (60), and a first through hole (31) for the positioning shaft (60) to penetrate is formed in the center of the eccentric wheel (3).

3. The pruning shears facilitating quick blade change as claimed in claim 2, wherein: be equipped with third through-hole (321) with first through-hole (31) intercommunication on arch (32), locating hole (50) bottom is equipped with fourth through-hole (51) that runs through bottom plate (5), location axle (60) pass first through-hole (31), third through-hole (321) and fourth through-hole (51) in proper order and stretch out bottom plate (5), this pruning scissors still includes bottom (7), location axle (60) stretch out the one end tip of bottom plate (5) with bottom (7) threaded connection.

4. The pruning shears facilitating quick blade change as claimed in claim 3, wherein: the bottom cover (7) is provided with an installation groove (70), a nut (71) is fixedly arranged in the installation groove (70), an external thread is formed in the end part, extending out of the bottom plate (5), of the positioning shaft (60), and the bottom cover (7) is in threaded connection with the positioning shaft (60) through the nut (71).

5. The pruning shears facilitating quick blade change as claimed in claim 3, wherein: the lower surface of the bottom cover (7) is provided with a lightening groove (72), and a reinforcing rib (73) which is convenient to screw and grasp is arranged in the lightening groove (72).

6. The pruning shears facilitating quick blade change as claimed in claim 2, wherein: the gearbox (6) is fixedly provided with a limiting column, and the bottom plate (5) is provided with a limiting hole (52) for the limiting column to penetrate through.

7. The pruning shears facilitating quick blade change as claimed in claim 2, wherein: the eccentric wheel (3) is in splined connection with the large gear (2), one of the eccentric wheel (3) and the large gear (2) is provided with an internal spline, and the other one is provided with an external spline.

8. The pruning shears facilitating quick blade change as claimed in claim 7, wherein: the outer spline (33) are equipped with first direction cambered surface (330) towards the one end tip of inner spline (20), inner spline (20) are equipped with second direction cambered surface (200) towards the one end tip of outer spline (33), first direction cambered surface (330) cooperate with second direction cambered surface (200) and are arranged in guiding outer spline (33) automatic sliding in inner spline (20).

9. The pruning shears for facilitating quick blade replacement as in claim 7, wherein: the gear wheel (2) is provided with a second through hole (21), the lower section of the second through hole (21) is provided with the internal spline (20), the upper section of the second through hole (21) is in interference fit with a second bearing (210), and the gear wheel (2) is rotatably connected with the positioning shaft (60) through the second bearing (210).

10. The pruning shears facilitating quick blade change as claimed in claim 1, wherein: the first bearing (320) is a needle bearing, the outer ring of the first bearing (320) is in interference fit with the positioning hole (50), and the inner ring of the first bearing (320) is in interference fit with the protrusion (32).

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