Cutting mechanism and mower

Abstract

The embodiment of the utility model provides a cutting mechanism and a mower. According to the technical scheme provided by the embodiment of the invention, the cutter extends out to carry out cutting operation when the cutter head rotates, the cutter retracts and is located in the outer contour area of the cutter head after the cutter head stops rotating, and then the cutter is shielded by the auxiliary cutter head below, so that the probability that a user accidentally touches the cutter to be injured is reduced to the minimum; and meanwhile, the normal cutting performance of the machine is not influenced. In addition, due to the fact that the auxiliary cutter head is additionally arranged below the cutter head, the auxiliary cutter head rotates below the cutter head to act on the dense grass in the dense grass cutting process, the influence of the dense grass on the cutter head is reduced, and the probability that the cutter head is locked is reduced. A notch is formed in the edge of the auxiliary cutterhead, and the first connecting piece of the cutter is exposed at the notch, so that a user can replace the cutter conveniently.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electrical appliances, in particular to a cutting mechanism and a lawn mower. BACKGROUND

[0002] With the continuous development of electromechanical technology, many work can be completed by using electromechanical equipment. For example, lawn trimming work, by using a movable lawn mower, not only can efficiently trim a large area of lawn, but also can ensure that the trimmed lawn is neat and uniform. The cutting mechanism is provided on the lawn mower, and the cutting mechanism is used to trim the lawn.

[0003] The cutting mechanism of the common lawn mower is to fix one or several cutters on the cutter head, and the cutter head is driven to rotate by the motor to realize mowing. However, when the lawn mower is carried, the existing structure of the lawn mower is easy to cut the fingers of the user. In order to improve the safety and increase the protection structure, the structure will become complex, and it is not convenient for the user to replace the cutter. CONTENT OF THE INVENTION

[0004] In view of the above problems, the present application provides a cutting mechanism which not only meets the safety protection of the cutter to the personnel, but also is convenient for the user to replace the cutter.

[0005] In an embodiment of the present application, a cutting mechanism is provided. The cutting mechanism comprises:

[0006] a cutter head;

[0007] at least one cutter, which is rotatably connected to the cutter head by a first connecting piece; when the cutter head rotates, the cutter rotates and extends relative to the cutter head to cut; when the cutter head stops rotating, the cutter rotates and retracts relative to the cutter head and is located within the outer contour area of the cutter head;

[0008] a secondary cutter head located below the cutter head and rotating synchronously with the cutter head;

[0009] wherein a notch is provided on the edge of the secondary cutter head, the position of the notch corresponds to the position of the first connecting piece, and the first connecting piece is exposed at the notch.

[0010] Optionally, the outer contour edge of the secondary cutter head is located inside the outer contour edge of the cutter head in the direction perpendicular to the rotation axis of the cutter head.

[0011] Optionally, the thickness of the secondary cutter head is less than the thickness of the cutter head.

[0012] Optionally, the thickness h1 of the secondary cutter head is equivalent to the thickness h2 of the cutter, h1 = h2 ± 1mm.

[0013] Optionally, the secondary cutter head is provided with a set distance from the cutter head; the set distance is 5-8 times the thickness of the cutter.

[0014] Optionally, the cutting mechanism further comprises a blocking member; the cutter head and / or the cutter is provided with the blocking member; the cutter head rotates, the cutter extends outwards with a force greater than the blocking force provided by the blocking member; the cutter head stops rotating, after the cutter head retracts, the blocking force provided by the blocking member limits the movement of the cutter.

[0015] Optionally, the cutting mechanism further comprises a second connecting member; the upper end of the second connecting member is connected with the motor; from top to bottom, the cutter head and the auxiliary cutter head are sequentially connected with the second connecting member.

[0016] Optionally, the cutting mechanism further comprises a support; the auxiliary cutter head is fixedly installed on the support; the support is installed on the second connecting member through a bearing.

[0017] Optionally, the cutting mechanism further comprises an end cover; the end cover is arranged at the bottom end of the second connecting member; the bearing is sealingly fixed on the support through the end cover.

[0018] In another embodiment of the present application, a lawn mower is provided. The lawn mower comprises a machine body and a cutting mechanism. The cutting mechanism can be implemented by using the above-mentioned embodiments.

[0019] In the technical scheme provided by the embodiments of the present application, the cutter extends outwards to perform cutting operation when the cutter head rotates, and the cutter retracts and is located within the outer contour area of the cutter head after the cutter head stops rotating, and is further shielded by the lower auxiliary cutter head, so that the probability of user injury caused by accidental contact with the cutter is reduced to the minimum, and meanwhile, the normal cutting performance of the machine is not affected. In addition, because the auxiliary cutter head is additionally arranged below the cutter head, the auxiliary cutter head rotates below the dense grass in dense grass cutting, and thus the influence of the dense grass on the cutting cutter head is reduced, and the probability of cutting cutter head stalling is reduced. The edge of the auxiliary cutter head is provided with an opening, and the first connecting member of the cutter is exposed at the opening, so as to facilitate the user to replace the cutter. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical schemes in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0021] Figure 1 Fig. 1 shows a bottom view of a lawn mower provided by an embodiment of the present application;

[0022] Figure 2 Fig. 2 shows a side view of a lawn mower provided by an embodiment of the present application;

[0023] Figure 3 A cross-sectional view of a cutting mechanism in a mower is shown;

[0024] Figure 4 A cross-sectional view of a cutting mechanism in a mower is shown from another angle;

[0025] Figure 5 A cross-sectional view of a cutting mechanism in a mower is shown from another angle; Figure 4 A cross-sectional view of a cutting mechanism in a mower is shown from another angle;

[0026] Figure 6 A cross-sectional view of a cutting mechanism in a mower is shown from another angle;

[0027] Figure 7 A cross-sectional view of a cutting mechanism in a mower is shown from another angle; DETAILED DESCRIPTION

[0028] At present, the common mower cutterhead structure is to fix one or several cutters on the cutterhead, and to realize mowing by rotating the cutterhead driven by a motor. When the intelligent mower is carried, the cutterhead of the existing structure is easy to cut the user's fingers. The common solution is to add a safety shield, or to realize the safety protection of the machine cutter by the elastic body extension cutter solution. Adding a safety shield on the mower increases the distance between the cutter and the outer edge of the machine body, which will affect the cutting performance of the machine, especially the cutting to the edge performance; the elastic body extension cutter solution affects the operability of the user to replace the cutter, making the cutter replacement operation complex.

[0029] The solutions provided by the embodiments of the present application realize the safety protection of the cutter by adding a secondary cutterhead, and not only this but also improve the mowing performance of the mower.

[0030] The application will be further described below in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the application, and not to limit the application. In addition, it should be noted that, for the sake of description, only the parts related to the application are shown in the drawings, and not all the structures. In the description of the application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrated; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances. In the application, unless otherwise explicitly specified and limited, the first feature is "on" or "below" the second feature, which can include the direct contact between the first and second features, or the contact between the first and second features through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes the first feature above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes the first feature below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature. In the description of the embodiments, the terms "up", "down", "right", etc. orientation or position relationship is based on the orientation or position relationship shown in the drawings, which is only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the application. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0031] The mower provided by each of the embodiments of the application can be an automatic mower or a semi-automatic mower device, etc. The automatic mower can also be called an intelligent mower robot. The intelligent mower robot can, but is not limited to, identifying boundaries, planning paths, identifying grass density, changing working modes based on different grass densities, identifying obstacles, autonomously avoiding fixed obstacles and movable obstacles (such as pedestrians or animals, etc.).

[0032] For example, the lawn mower, if it is an automatic lawn mower, can include but is not limited to: a body, a collection assembly, a cutting mechanism, a walking mechanism, and a control device. Among them, the collection assembly can include, for example: a fisheye camera, a panoramic camera, an infrared ranging sensor, a laser radar, a positioning device (such as a GPS, a Beidou navigation device), and the like. The cutting mechanism is used to perform the action of mowing the lawn. The walking mechanism is used to perform the action of walking. The control device is electrically connected with the collection assembly, the cutting motor in the cutting mechanism, and the walking motor in the walking mechanism, to obtain the information collected by the collection assembly, control the start and stop of the cutting motor in the cutting mechanism, control the start and stop of the walking motor, and the like. Further, the cutting mechanism can also be raised and lowered, and the control device can also control the raising and lowering of the cutting mechanism.

[0033] Referring to Figure 1 and Figure 2 In an embodiment of the present application, a lawn mower is provided, which includes: a body 1, a cutting mechanism 2, and a walking mechanism 3. Figure 1 and Figure 2 The structure that can be implemented by the body is schematically shown, and the appearance structure of the body is not specifically limited in the embodiment. The cutting mechanism 2 has a cutting area relative to the body, which can be considered as an area that can be cut by the cutter on the cutting mechanism 2 when the cutting mechanism 2 rotates, and the edge of the cutting area is the cutter tip circle formed when the cutter rotates. One, two, three, or more cutting mechanisms 2 can be arranged at the bottom of the body 1. The cutting areas of two adjacent cutting mechanisms 2 can partially overlap.

[0034] The walking mechanism 3 can include a front wheel set 31 and a rear wheel set 32, wherein the front wheel set 31 can be a direction wheel and can rotate by 360 degrees, and the rear wheel set 32 can be a driving wheel set and can provide power for advancing. In the process of moving the body, the cutting mechanism 2 can cut and trim the grass in the target area passed through.

[0035] In order to improve safety and avoid the situation that the cutter injures people when the user moves the lawn mower, some lawn mowers currently increase a protective cover outside to increase the distance between the cutter and the outer cover of the lawn mower, so that the user's hand cannot easily reach this distance, which is the safety distance. When the human body accidentally extends to the bottom of the lawn mower, no harm will be caused to the person within the safety distance. Therefore, if the safety of the lawn mower is to be higher, the larger the safety distance is, the better, but when the lawn mower travels to the edge of the target area to be cut, if there is an obstacle, such as a fence or a wall, at the edge of the target area to be cut at this time, in order to ensure the safety of the lawn mower, there will be a certain walking gap between the lawn mower and the obstacle during the travel of the lawn mower, so the grass in the safety distance and the walking gap cannot be cut by the lawn mower, causing the problem of more grass left at the boundary of the cutting area.

[0036] The cutting mechanism 2 comprises a cutter head 21, at least one cutter 29, and a secondary cutter head 22. Figure 3 and Figure 4 The cutting mechanism 2 comprises a cutter head 21, at least one cutter 29, and a secondary cutter head 22. Figure 6 and Figure 7 The cutting mechanism 2 comprises a cutter head 21, at least one cutter 29, and a secondary cutter head 22. Figure 3 and Figure 4 The cutting mechanism 2 comprises a cutter head 21, at least one cutter 29, and a secondary cutter head 22.

[0037] In the technical scheme provided by the embodiment, the cutter extends out to perform cutting operation when the cutter head rotates, and the cutter retracts into the outer contour area of the cutter head after the cutter head stops rotating, and the secondary cutter head below shields the cutter, so that the probability of injury caused by accidental contact of the user with the cutter is reduced to the minimum; meanwhile, the normal cutting performance of the machine is not affected. In addition, because the secondary cutter head is additionally arranged below the cutter head, the secondary cutter head rotates below in the dense grass cutting, so as to act on the dense grass, thereby reducing the influence of the dense grass on the cutting cutter head and reducing the probability of stall of the cutting cutter head. It can be seen that the scheme provided by the embodiment can not only satisfy the safety protection of the cutter on the personnel, but also improve the cutting performance of the machine, especially the cutting performance in the dense grass.

[0038] In an implementable embodiment, the secondary cutter head 22 can rotate coaxially with the cutter head 21, or can be non-coaxial, which is not limited in the embodiment.

[0039] In the example shown in Figure 6 and Figure 7 , the projection of the secondary cutter head 22 in the direction perpendicular to the rotation axis of the cutter head 21 is located inside the outer contour edge of the cutter head 21. That is, the size of the secondary cutter head 22 is smaller than the size of the cutter head 21. For example, the distance d between the outer contour edge of the secondary cutter head 22 and the outer contour edge of the cutter head 21 can be 1mm-10mm. Specifically, the distance between the outer contour edge of the secondary cutter head 22 and the outer contour edge of the cutter head 21 can be 2mm or 5mm.

[0040] If the secondary cutter head 22 and the cutter head 21 are not regular shapes, or the secondary cutter head 22 and the cutter head 21 are non-coaxial, the above distance d refers to the closest distance between the outer contour edge of the secondary cutter head and the outer contour edge of the cutter head 21. If the secondary cutter head 22 and the cutter head 21 are regular shapes, such as Figure 6 and Figure 7 , and coaxial, the above d can be the difference between the radius of the secondary cutter head 22 and the radius of the cutter head 21.

[0041] In specific implementation, such as Figure 4 As shown, the thickness h1 of the secondary cutter head 22 can be less than the thickness H of the cutter head 21. The thickness h1 of the secondary cutter head 22 can be comparable to the thickness h2 of the cutting tool, such as h1 = h2 ± 1 mm.

[0042] Furthermore, the location of the secondary cutter head 22 below the cutter head 21 is not arbitrary. If the distance between the secondary cutter head 22 and the cutter head 21 is too close, the safety of the secondary cutter head and its performance in reducing the impact of the dense grass on the cutter head will not achieve the desired effect. If the distance between the secondary cutter head 22 and the cutter head 21 is too far, the safety and the effect of the dense grass will also be poor. In this embodiment, the secondary cutter head 22 is set at a distance D from the cutter head 21; the set distance D can be 5 to 8 times the thickness of the cutter. For example, the set distance D between the secondary cutter head 22 and the cutter head 21 is 6 times the thickness h2 of the cutter, that is, D = 6h2.

[0043] In this embodiment, the blade 29 is rotatably connected to the blade disc 21 via the first connector 210. After prolonged use, the blade's mowing efficiency will decrease, thus requiring replacement. For user convenience in assembly and disassembly, please refer to... Figure 6 and Figure 7 As shown, in this embodiment, a notch 221 is provided on the outer contour edge of the secondary cutter head 22. The position of the notch 221 corresponds to the position of the first connector 210; the first connector 210 is exposed at the notch 221. The first connector 210 can be a quick-release structure. When the user disassembles the cutter, the first connector can be seen directly through the notch 221, which provides the user with operating space for disassembly and assembly. The user can disassemble the cutter by operating the first connector 210 and then install a new cutter. This embodiment does not specifically limit the structure of the first connector 210; it can be any structure that can disassemble and connect cutters.

[0044] Furthermore, in this embodiment, the cutting mechanism 2 may also include a blocking element 23. The blocking element 23 is provided on the cutter head 21 and / or the cutter 29. For example... Figure 3 In the illustrated embodiment, the cutter head 21 is provided with a blocking element 23. This blocking element 23 can be a magnet, a rubber-like friction element that increases resistance, etc. When the cutter head 21 rotates, the outward extension force of the cutter 29 is greater than the blocking force provided by the blocking element 23; when the cutter head 21 stops rotating and the cutter 29 retracts, the blocking force provided by the blocking element 23 restricts the movement of the cutter 29. Taking a magnet as an example, when the cutter head 21 rotates, the centrifugal force on the cutter is greater than the magnetic force of the magnet (i.e., the blocking force), and the cutter is thrown out by the centrifugal force (i.e., extended, such as...). Figure 7); the cutter 29 will rotate due to inertial force; when the cutter 29 moves to the vicinity of the magnet, the cutter will be attracted by the magnet (i.e. the movement of the cutter is limited), and the cutter is maintained in the retracted state as shown in Figure 6 When the user moves the mower, the cutter is hidden below the cutter disc 21 in the retracted state as shown in Figure 6 , and the fingers of the user are not easy to touch, so the safety protection is good.

[0045] In actual operation, there is also a situation that when the mower is working (i.e. the cutter disc rotates and the cutter cuts grass), the user may move the mower or kick the mower, or an animal may accidentally touch the mower, etc. In order to further improve the safety protection, when the collecting assembly senses that the machine body is moved or tilted due to kicking or other reasons, the control device controls the motor to stop working, so that the cutter disc stops rotating and the cutter is hidden below the cutter disc.

[0046] In fact, the cutter can also be hidden above the cutter disc, which is not limited in the embodiment,

[0047] In the embodiment, the auxiliary cutter disc not only improves the safety protection of the cutter, but also helps to improve the close grass cutting performance of the mower. In operation, the auxiliary cutter disc 22 and the cutter disc 21 rotate synchronously, and the rotating auxiliary cutter disc can act on the close grass, reducing the influence of the close grass on the cutter disc and reducing the probability of the cutter disc being blocked by the close grass. Specifically, the auxiliary cutter disc 22 and the cutter disc 21 can be driven by the same motor. As shown in Figure 3 and Figure 4 , the cutting mechanism 2 further comprises a second connecting piece 26. As shown in Figure 5 , the upper end of the second connecting piece 26 is connected with the motor 4; from top to bottom, the cutter disc 21 and the auxiliary cutter disc 22 are sequentially connected with the second connecting piece 26.

[0048] As shown in Figure 3 , Figure 4 and Figure 5 , the second connecting piece 26 is a rod, and the top of the second connecting piece 26 is provided with a connecting hole, and the motor shaft of the motor 4 extends into the connecting hole and can drive the second connecting piece 26 to rotate through the connecting hole. The cutter disc 21 can be fixed on the second connecting piece 26 by screws 27.

[0049] The cutting mechanism 2 further comprises a support 24; the auxiliary cutter disc 22 is fixedly installed on the support 24; and the support 24 is installed on the second connecting piece 26 through a bearing 28. As shown in Figure 3 , Figure 4 and Figure 5As shown, the bearing 28 is sleeved on the second connecting piece 26, and the support 24 is sleeved outside the bearing 28. The bearing 28 can be a ball bearing with upper and lower steel rings and balls in the middle, and of course can also be other types of bearings, which are not limited in the embodiment.

[0050] Further, as shown in Figure 3 、 Figure 4 and Figure 5 , the cutting mechanism 2 can further include an end cover 25; the end cover 25 is arranged at the bottom end of the second connecting piece 26; the bearing 28 is sealed and fixed on the support 24 through the end cover 25.

[0051] When the motor 4 starts, the second connecting piece 26 is driven to rotate the cutter head 21 as the motor 4 rotates, and the cutter 29 on the cutter head 21 is thrown out by centrifugal force as the cutter head 21 rotates. The cutter can be thrown out because the centrifugal force is greater than the retarding force (such as magnetic force). When the motor 4 is turned off, the cutter head 21 stops rotating, and the cutter 29 will rotate due to inertia. When the cutter 29 moves to the vicinity of the magnet, it is attracted by the magnet. The secondary cutter head 22 stops rotating with the motor 4. The secondary cutter head 22 shields the cutter 29 and prevents the cutter 29 from being accidentally touched. In this state, the user will not be injured by accidentally touching the cutter when carrying the machine.

[0052] Referring to Figure 5 , a protective cover 20 can also be arranged above the cutting mechanism 2.

[0053] The embodiment of the application can not only meet the safety protection of the machine cutter to the personnel, but also not affect the normal cutting performance of the machine and the operability of the user replacing the cutter, and can also improve the grass cutting performance of the mower. Because of the existence of the secondary cutter head, the influence of the dense grass on the cutter head can be reduced in dense grass cutting.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the application, and not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the application.

Claims

1. A cutting mechanism, characterized by, The cutting mechanism comprises: a cutter disc; at least one cutter rotatably connected to the cutter disc through a first connecting member; the cutter disc rotates, the cutter extends out relative to the cutter disc to cut, the cutter disc stops rotating, the cutter retracts relative to the cutter disc and is located in the outer contour area of the cutter disc; a sub-cutter disc located below the cutter disc and rotating synchronously with the cutter disc; wherein the edge of the sub-cutter disc is provided with an opening, the position of the opening corresponds to the position of the first connecting member, and the first connecting member is exposed at the opening.

2. The cutting mechanism of claim 1, wherein, The projection of the sub-cutter disc in the direction perpendicular to the rotation axis of the cutter disc is located inside the outer contour edge of the cutter disc.

3. The cutting mechanism of claim 1, wherein, The thickness of the sub-cutter disc is smaller than the thickness of the cutter disc.

4. The cutting mechanism of claim 1, wherein, The thickness h1 of the sub-cutter disc is equivalent to the thickness h2 of the cutter, h1 = h2 ± 1mm.

5. The cutting mechanism of claim 1, wherein, The sub-cutter disc is set at a distance from the cutter disc, and the set distance is 5-8 times the thickness of the cutter.

6. The cutting mechanism according to any one of claims 1 to 5, wherein, Further comprising a blocking member; the cutter disc and / or the cutter is provided with the blocking member; the cutter disc rotates, the extension force of the cutter is greater than the blocking force provided by the blocking member; the cutter disc stops rotating, and after the cutter disc retracts, the blocking force provided by the blocking member limits the movement of the cutter.

7. The cutting mechanism according to any one of claims 1 to 5, wherein, Further comprising a second connecting member; the upper end of the second connecting member is connected with a motor; from top to bottom, the cutter disc and the sub-cutter disc are sequentially connected with the second connecting member.

8. The cutting mechanism of claim 7, wherein, Further comprising a support; the sub-cutter disc is fixedly installed on the support; the support is installed on the second connecting member through a bearing.

9. The cutting mechanism of claim 8, wherein, Further comprising an end cover; the end cover is arranged at the bottom end of the second connecting member; the bearing is sealed and fixed on the support through the end cover.

10. A lawnmower characterised in that, The cutting mechanism comprises: a machine body; and the cutting mechanism according to any one of claims 1-9.

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