阅读说明：本技术 一种安全防护结构及割草机 (Safety protection structure and lawn mower ) 是由 薛玉雷 刘楷 于 2021-09-17 设计创作，主要内容包括：本发明公开了一种安全防护结构及割草机,安全防护结构设置在外围壳体内侧和切割单元外侧之间,包括：防护罩,位于防护结构最底部；浮动组件,防护罩与外围壳体通过浮动组件连接,防护罩通过浮动组件实现上下移动；当切割单元切割高度高于或等于第一高度时,所述防护罩下边缘保持第二高度位置不变；当切割单元下行至切割高度低于第一高度时,所述防护罩跟随切割单元同步向下移动,保证防护罩低于割草高度10mm以上。(The invention discloses a safety protection structure and a mower, wherein the safety protection structure is arranged between the inner side of a peripheral shell and the outer side of a cutting unit, and comprises: the protective cover is positioned at the bottommost part of the protective structure; the protective cover is connected with the peripheral shell through the floating assembly, and the protective cover moves up and down through the floating assembly; when the cutting height of the cutting unit is higher than or equal to the first height, the lower edge of the protective cover keeps the second height position; when the cutting unit descends to a position where the cutting height is lower than the first height, the protective cover moves downwards along with the cutting unit synchronously, and the protective cover is guaranteed to be lower than the mowing height by more than 10 mm.)

1. The utility model provides a safety protection structure, sets up between the peripheral casing is inboard and the cutting unit outside, its characterized in that: the method comprises the following steps:

the protective cover is positioned at the bottommost part of the protective structure;

the protective cover is connected with the peripheral shell through the floating assembly, and the protective cover moves up and down through the floating assembly;

when the cutting height of the cutting unit is higher than or equal to the first height, the lower edge of the protective cover keeps the second height position;

when the cutting unit descends to a cutting height lower than the first height, the protective cover moves downwards along with the cutting unit synchronously.

2. The safety shield structure of claim 1, wherein the float assembly comprises:

the floating support is arranged at the upper part of the protective cover and is fixedly connected with the protective cover;

the fixed bracket is fixedly connected with the peripheral shell;

an elastic unit disposed between the floating bracket and the fixed bracket;

when the cutting height of the cutting unit is higher than the first height, under the action of the elastic force of the elastic unit, the protective cover fixedly connected with the floating support can surround the cutting unit at the second height and cover all movement tracks of the blades on the cutting unit;

when the cutting unit moves downwards relative to the peripheral machine shell, the cutting unit can touch the floating support and overcome the elasticity of the elastic unit to drive the floating support and the protective cover to synchronously move downwards together.

3. The safety shield structure of claim 1 or 2, wherein the first height is greater than the second height, the second height is no less than 38mm, and the difference between the first height and the second height is no less than 5 mm.

4. The safety shield structure of claim 2,

an annular cavity is arranged on the peripheral shell and positioned around the motor sleeve;

one side of the fixed support is fixedly connected with the inner wall of the annular cavity, and the bottom of the fixed support is provided with a lower limiting part;

the bottom of the floating support is fixedly connected with the protective cover, the upper end of the floating support extends into the annular cavity and is in sliding connection with the outer wall of the annular cavity, and the top of the floating support is provided with an upper limit part;

the elastic unit is arranged in the annular cavity and is positioned between the lower limiting part and the upper limiting part.

5. The safety shield structure of claim 2,

a disc-shaped contact element extending towards the machine shell direction is fixedly connected above the cutter disc in the cutting unit, and the disc-shaped contact element can synchronously move along with the cutter disc;

the protective cover is provided with an annular limiting piece extending towards the cutting unit;

when the cutting unit moves downwards relative to the peripheral casing, the disc-shaped abutting piece can be in contact with the annular limiting piece on the protective cover, so that the elastic force of the elastic unit is overcome, and the protective cover is driven to synchronously move downwards together.

6. The safety shield structure of claim 4,

the protective cover further comprises a horizontal rotating supporting piece which is arranged between the upper limiting part of the floating support and the elastic unit and enables the protective cover to freely rotate around a central shaft of the protective cover relative to the machine shell.

7. The safety shield structure of claim 6,

the horizontal rotation support frame includes: a bearing and a bearing inner race support, wherein,

the outer ring of the bearing is in interference fit with the inner wall of the top of the floating support, and the inner ring of the bearing is in interference fit with the bearing inner ring support;

the bottom of the bearing inner ring support is connected with the top end of the elastic unit in an abutting mode.

8. The safety shield structure of claim 2,

the elastic unit is a spring.

9. The safety shield structure of claim 2,

the protective cover is of a net structure.

10. A lawnmower, characterized in that a safety guard structure according to any one of claims 3 to 9 is used.

Technical Field

The invention relates to a mower, in particular to a safety protection structure and a mower.

Background

The working unit of the mowing robot is a cutter disc rotating at a high speed, and sharp blades are arranged on the cutter disc. There is therefore a need for a mower having an effective guard structure for the cutting unit to prevent injury to the user.

Most of the existing protective structures are used for reducing the height of a peripheral casing or fixing an additional protective structure on a main casing. The reduction in housing height increases safety, but sacrifices the performance of the mower. If the mower meets grass with high ratio and high density in work, the resistance is obviously increased, the driving wheel of the mower slips, the effective mowing performance of the mower is lost, and the grass can be damaged.

At present, a protection structure is arranged on the lower shell of the mower, and the protection structure is designed to be floating. This protective structure is effective in laboratory testing. When the mower works in practice, grass in a field exerts an upward force on the protection structure, the protection structure can float upwards automatically, the ground clearance of the protection structure is increased, the distance easily exceeds the size of a safety test finger, and the protection function is lost.

At present, the other protection structure adopts the matching of internal protection and external protection and corresponds to different safety test items.

The safety protection structure of the existing mower or the difficulty in mowing and the efficiency greatly reduced. Or a double-protection structure is adopted, so that the number of parts is increased, and the cost is improved. The invention designs a novel safety protection structure, and when the mower meets high-density grass, the resistance of the grass to the mower can be effectively reduced. Meanwhile, a single protection structure is adopted, so that the number of parts is reduced.

Disclosure of Invention

In view of the above technical problems, the present invention provides a safety protection structure, which is disposed at an outer side of a cutting unit and an inner side of a peripheral housing, wherein when a mowing height is greater than a predetermined height, a ground clearance of the safety protection structure is not changed, and the ground clearance is set to be smaller than a predetermined height. When the mowing height is adjusted to be lower than the preset height, the ground clearance of the protection structure can be adjusted simultaneously along with the height of the cutter head, and the protection cover is guaranteed to be lower than the mowing height by more than 10 mm.

In order to achieve the technical purpose, the invention adopts the following technical means:

a safety shield structure disposed between an inside of a peripheral housing and an outside of a cutting unit, comprising:

the protective cover is positioned at the bottommost part of the protective structure;

the protective cover is connected with the peripheral shell through the floating assembly, and the protective cover moves up and down through the floating assembly;

when the cutting height of the cutting unit is higher than or equal to the first height, the lower edge of the protective cover keeps the second height position;

when the cutting unit descends to a cutting height lower than the first height, the protective cover moves downwards along with the cutting unit synchronously.

The float assembly includes:

the floating support is arranged at the upper part of the protective cover and is fixedly connected with the protective cover;

the fixed bracket is fixedly connected with the peripheral shell;

an elastic unit disposed between the floating bracket and the fixed bracket;

when the cutting height of the cutting unit is higher than the first height, under the action of the elastic force of the elastic unit, the protective cover fixedly connected with the floating support can surround the cutting unit at the second height and cover all movement tracks of the blades on the cutting unit;

when the cutting unit moves downwards relative to the peripheral machine shell, the cutting unit can touch the floating support and overcome the elasticity of the elastic unit to drive the floating support and the protective cover to synchronously move downwards together.

The first height is higher than the second height, the second height is not less than 38mm, and the difference between the first height and the second height is not less than 5 mm.

An annular cavity is arranged on the peripheral shell and positioned around the motor sleeve;

one side of the fixed support is fixedly connected with the inner wall of the annular cavity, and the bottom of the fixed support is provided with a lower limiting part;

the bottom of the floating support is fixedly connected with the protective cover, the upper end of the floating support extends into the annular cavity and is in sliding connection with the outer wall of the annular cavity, and the top of the floating support is provided with an upper limit part;

the elastic unit is arranged in the annular cavity and is positioned between the lower limiting part and the upper limiting part.

A disc-shaped contact element extending towards the machine shell direction is fixedly connected above the cutter disc in the cutting unit, and the disc-shaped contact element can synchronously move along with the cutter disc;

the protective cover is provided with an annular limiting piece extending towards the cutting unit;

when the cutting unit moves downwards relative to the peripheral casing, the disc-shaped abutting piece can be in contact with the annular limiting piece on the protective cover, so that the elastic force of the elastic unit is overcome, and the protective cover is driven to synchronously move downwards together.

The protective cover further comprises a horizontal rotating supporting piece which is arranged between the upper limiting part of the floating support and the elastic unit and enables the protective cover to freely rotate around a central shaft of the protective cover relative to the machine shell.

The horizontal rotation support frame includes: a bearing and a bearing inner race support, wherein,

the outer ring of the bearing is in interference fit with the inner wall of the top of the floating support, and the inner ring of the bearing is in interference fit with the bearing inner ring support;

the bottom of the bearing inner ring support is connected with the top end of the elastic unit in an abutting mode.

The elastic unit is a spring.

The protective cover is of a net structure.

A mower adopts the safety protection structure.

Has the advantages that:

the invention relates to a safety protection structure, which comprises a floating support, a fixed support and an elastic unit arranged between the floating support and the fixed support, wherein a protective cover is fixedly arranged at the bottom of the floating support, and when the mowing height is greater than or equal to the preset mowing height, the ground clearance of the protective cover is unchanged; when the mowing height is smaller than the preset mowing height, the cutting unit can touch the floating support and overcome the elastic force of the elastic unit to drive the floating support and the protective cover to synchronously move downwards together, the whole cutting unit is always guaranteed to be located in the protective cover coverage range in the vertical moving process, and safety is improved. Simultaneously, because the height space that the cutting element can be adjusted is great, and its highest height can reach 60mm, adopts the design of this application, and when the high height that the cutting element rose was higher, the protection casing can keep at a take the altitude, no longer rises along with the cutting element, and when the object mistake was gone into the lawn mower bottom, the protection casing can block that the object enters into the work area of cutting element.

Secondly, in whole cutting unit and protection casing motion process, adopt this structure can guarantee all the time that the protection casing is less than the height of mowing a definite height, owing to protection casing diameter itself will be greater than cutting unit working radius, also can prevent that children from lifting the arm into the lawn mower bottom by accident when, the cutting unit is touched to crooked finger, avoids causing the injury to children.

The protection structure disclosed by the invention can be independently assembled and combined with the mower equipment as an integral module, can be adapted to mowers of different models, and has better applicability. Meanwhile, the independent modular structure can well reduce the assembly difficulty and the part management difficulty.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

FIG. 1 is an exploded view of the overall construction of the mower of the present invention;

FIG. 2 is a cross-sectional view of the overall structure of the mower of the present invention;

FIG. 3 is a cross-sectional view of the protective structure of the present invention assembled with the lower shell;

FIG. 4 is an exploded view of the protective structure of the present invention;

FIG. 5 is a sectional view of the guard structure assembled when the mowing height of the present invention is greater than 45 mm;

figure 6 is a sectional view of the guard structure assembled when the mowing height of the invention is less than 45 mm.

The reference signs are: 1. an upper housing; 2. a lower housing; 3. A protective structure; 301. a floating mount; 302. a bearing; 303. fixing a bracket; 304. a spring; 305. a protective cover; 306. a bearing inner race support; 4. and a cutting unit.

Detailed Description

In order to make the purpose and technical solution of the embodiments of the present invention clearer, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

The meaning of "and/or" in the present invention means that the respective single or both of them exist individually or in combination.

The meaning of "inside and outside" in the present invention means that the direction from the signal line to the inside of the working area is inside, and vice versa, with respect to the signal line itself; and not as a specific limitation on the mechanism of the device of the present invention.

The term "connected" as used herein may mean either a direct connection between the components or an indirect connection between the components via other components.

The invention discloses a safety protection structure, which is used for garden tools such as a mower, a mowing robot and the like. In the working process, when the cutting height of the cutting unit is higher than or equal to the preset first height, the lower edge of the protective cover keeps the second height position unchanged; when the cutting unit descends to a cutting height lower than a preset first height, the protective cover can move downwards along with the cutting unit synchronously. In the whole movement process, the protective cover always covers the cutting unit, so that a better protection effect is achieved. In actual use, the first height is higher than the second height, the second height is not less than 38mm, and the difference between the first height and the second height is not less than 5 mm. The technical solution is described below with a specific embodiment, in which the first height is set to 45mm, the second height is set to 35mm, and the difference between the first height and the second height is 10 mm.

Fig. 1 shows an exploded view of the overall structure of the mowing robot, which comprises an upper shell 1, a lower shell 2, a protective structure 3 and a cutting unit 4. The upper shell 1 and the lower shell 2 constitute the entire fuselage body, and other components of the fuselage body, such as electronic components, drive components, etc., are not described in detail here, but the protective structure 3 and the cutting unit 4 are described in detail in the figures and the following embodiments.

As shown in fig. 2, which is a cross-sectional view of the overall structure of the lawn mower, the protective structure 3 and the cutting unit 4 are both assembled on the lower housing 2, and the entire lawn mowing robot is obtained after the upper housing 1 and the lower housing 2 are assembled. As can be seen from fig. 1 and 2, the protection component 3 can be directly assembled with the entire mowing robot as an integral part, and in the actual assembly process, the protection component 3 can be independently assembled, and then the overall assembly of the mowing robot is completed, so that the assembly steps can be simplified, and the assembly efficiency can be improved. Meanwhile, the mowing robots of different models can complete the adaptation of the protection component 3 through small change, so that the protection component 3 has good applicability.

As shown in fig. 3, which is a sectional view showing the assembly of the protective structure and the lower case of the present invention, the protective structure 3 is directly assembled to the lower case 2, and the fixing bracket 303 and the lower case 201 are provided with the spring 304.

Fig. 4 is an exploded view of a shelter structure, comprising a floating support 301; a bearing 302; a fixed bracket 303; a spring 304; a protective cover 305; bearing inner race support 306.

Fig. 5 is a sectional view showing the assembly of the guard structure when the mowing height is greater than 45mm, wherein the outer ring of the bearing 302 is in interference fit with the floating bracket 301, and the inner ring of the bearing 302 is in interference fit with the inner ring bracket 306. The whole protection structure is fixed on the lower shell 201 through a fixing bracket 303, and a spring 304 is arranged in the middle.

The shield 305 is fixed to the floating mount 301 by screws so as to be freely rotatable. At this moment, the mowing height is larger than 45mm, the cutting unit 4 does not contact the protective cover 305, the whole protective structure is tightly attached to the lower shell 201 under the action of the spring, and the ground clearance of the protective structure is unchanged.

Fig. 6 is a sectional view of the guard structure assembled when the mowing height is less than 45mm, and the cutting unit 4 has contacted the guard 305. As can be seen from the figure, the cutting unit 4 includes a power element and a cutting part arranged at an output end of the power element, the cutting part may be a blade, a cutter disc, or the like, specifically, in this embodiment, the power element is a motor, the cutting part is a cutter disc, and a contact part which does not rotate along with the motor is arranged at an output end of the motor.

When the height is lowered, the contact parts on the cutting unit 4 are pressed onto the protective cover 305, and the protective structure is driven to be lowered synchronously; specifically, the method comprises the following steps: a disc-shaped contact element extending towards the machine shell direction is fixedly connected above the cutter disc in the cutting unit, and the disc-shaped contact element can synchronously move along with the cutter disc;

the protective cover is provided with an annular limiting piece extending towards the cutting unit;

when the cutting unit moves downwards relative to the peripheral casing, the disc-shaped abutting piece can be in contact with the annular limiting piece on the protective cover, so that the elastic force of the elastic unit is overcome, and the protective cover is driven to synchronously move downwards together.

When the height is increased, the protective cover 305 is synchronously increased under the elastic force of the spring. Therefore, the protective cover can be ensured to be lower than the ground clearance of the cutting unit by more than 10 mm.

In this structure, whole bearing part is by the cladding in floating mount and inner circle support, has better protectiveness to the bearing, and spring extrusion inner circle support provides the holding power to the bearing simultaneously, and the bearing atress is more steady, and the protection casing is more in the same direction as smooth at the rotation in-process.

When the cutting height of the cutting unit is reduced, the contact part on the cutting unit is in contact with the inner ring of the protective cover, the protective cover is shown in figure 4, the inner ring at the top of the protective cover extends towards the middle, the lower part of the protective cover is of a cover body structure, and the protective cover is connected with the floating support through the top. When the cutting unit goes down to a certain height, the contact part contacts the inner ring of the protective cover, the protective cover is pushed to go down, and the protective cover can rotate, so that the rotation of the protective cover is avoided after the contact part contacts the protective cover, the contact part can be fixed on the output end of the motor in a rotating connection mode, or the contact part is contacted with the protective cover in a point contact or line contact mode.

Taking point contact as an example, a plurality of spherical bulges which are uniformly distributed are arranged on the contact part, and the spherical bulges are in contact with the inner ring of the protective cover;

taking line contact as an example, a plurality of cylindrical protrusions are arranged on the contact part, and arc surfaces of the cylindrical protrusions are in contact with the inner ring of the protective cover.

The contact area can be reduced and the resistance to rotation of the protective cover can be reduced by point contact and line contact.