Grass mowing head and grass mowing executing mechanism

Abstract

The utility model provides a grass mowing head and a grass mowing head actuating mechanism, and belongs to the technical field of gardening tools, the grass mowing head comprises a grass mowing shell, the grass mowing shell is in driving connection with an output shaft of an actuating piece, a grass mowing rope is arranged in the grass mowing shell, the end part of the grass mowing rope penetrates out of the grass mowing shell, and a plurality of air outlet blades which are annularly distributed at intervals are integrally arranged on the upper end face of the grass mowing shell; along with rotation of the grass trimming head, the air outlet blades rotate synchronously so as to discharge air towards the periphery of the grass trimming head. The grass mowing head has the advantages that when the grass mowing head works, the air outlet blades rotate to blow air to the periphery, grass clippings cut by the grass mowing head are blown away to the periphery, the grass clippings can be prevented from being wound on the grass mowing head, even if part of the air outlet blades are broken, the remaining air outlet blades can still be kept on the grass mowing shell, the air outlet effect is kept, and continuous use of the grass mowing head cannot be affected; and potential safety hazards are avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of garden tools and relates to a grass head and a grass cutting actuator. Background Art

[0002] At present, a lawn mower belongs to an electric tool for gardens. The working principle of the lawn mower is that a motor with a rotating output shaft drives a grass head to rotate, thereby driving a cutting element to perform cutting, so as to achieve the purpose of trimming a lawn or removing weeds. When the grass head is assembled with the motor, there is a gap at the assembly position, which is prone to grass entanglement and will affect the normal operation of the motor. In this regard, new types of lawn mowers have begun to appear on the market, that is, an air outlet part is added to the grass head, and airflow is generated as the grass head rotates to blow away the cut grass debris, avoiding the phenomenon of weed accumulation at the air outlet end during grass cutting. However, the air outlet part is an independent component, and it needs to be connected through connecting parts such as screws and buckles. Then, when the grass head performs grass cutting operations, it may collide with stones or other sundries and cause damage to the connecting parts. Then, the connection between the air outlet part and the grass head is unstable, affecting the use of the grass head and there are some potential safety hazards. Summary of the Utility Model

[0003] The purpose of the utility model is to address the above problems existing in the prior art and propose a grass head with an air outlet part integrally provided with the grass head.

[0004] The purpose of the utility model can be achieved by the following technical solutions: A grass head, comprising:

[0005] A grass shell, which is drivingly connected to the output shaft of the actuator. A grass string is arranged in the grass shell, and the end of the grass string passes through the grass shell. A plurality of annularly and spaced-apart air outlet blades are integrally provided on the upper end surface of the grass shell;

[0006] Wherein, as the grass head rotates, the air outlet blades rotate synchronously to achieve air outlet around the grass head.

[0007] In the above-mentioned grass head, along the radial direction of the grass shell, each air outlet blade extends inward and gradually inclines along the rotation direction of the output shaft.

[0008] A grass cutting actuator, comprising the above-mentioned grass head.

[0009] In the above-mentioned grass trimming actuator, it further includes an installation shell. An actuator is arranged inside the installation shell. The output shaft of the actuator passes through the installation shell and is connected to the grass trimming head. A first flow cavity is formed between the installation shell and the actuator. An air outlet cavity is formed between the installation shell and the grass trimming head. The air outlet blades are located in the air outlet cavity, and a second air outlet part is further arranged on the installation shell, and the second air outlet part is also located in the air outlet cavity. An air inlet is arranged on the installation shell. A first air duct is formed among the air inlet, the first flow cavity and the air outlet blades; a second air duct is formed among the air inlet, the first flow cavity and the second air outlet part.

[0010] In the above-mentioned grass trimming actuator, the second air outlet part includes a plurality of first air outlet windows which are annularly and spacedly arranged at the bottom of the installation shell.

[0011] In the above-mentioned grass trimming actuator, along the direction of the grass trimming head towards the installation shell, the upper edge of the air outlet blade is not lower than the lower edge of the first air outlet window.

[0012] In the above-mentioned grass trimming actuator, a connecting ring is integrally arranged at the bottom of the installation shell. The first air outlet window is arranged on the connecting ring, and a second flow cavity is formed between the connecting ring and the output shaft. The second flow cavity is communicated with the first flow cavity and the air outlet cavity.

[0013] In the above-mentioned grass trimming actuator, a second air outlet window is arranged on the side wall of the installation shell. An air outlet fan blade is further arranged on the output shaft. The air outlet fan blade is located inside the installation shell. The actuator includes an actuator motor fixed inside the installation shell. A third air duct is formed among the air inlet, the actuator motor and the second air outlet window.

[0014] In the above-mentioned grass trimming actuator, a limiting ring is arranged inside the installation shell. The limiting ring is fixed to the output shaft. A limiting groove is arranged on the limiting ring. And a limiting pin which can move linearly is arranged on the installation shell. By pressing the limiting pin, the inner end of the limiting pin can extend into the limiting groove, so that the relative position between the output shaft and the installation shell is fixed; the grass trimming head and the output shaft are in threaded connection.

[0015] Compared with the prior art, the beneficial effects of the utility model are as follows: the air outlet blades integrally arranged on the upper end surface of the grass beater shell can be integrally injection-molded with the grass beater shell during production. Then, during the production and assembly process of the grass head, there is no need to additionally increase the assembly steps, reducing the assembly process and saving assembly time. Moreover, when the grass head is working, the air outlet blades rotate to blow air around, blowing the grass clippings cut by the grass head to the surroundings, which can prevent them from winding around the grass head. And even if some of the air outlet blades are broken, the remaining air outlet blades can still remain on the grass beater shell, maintaining the air outlet effect, without affecting the continued use of the grass head and without posing a safety hazard. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a three-dimensional structural schematic diagram of the grass head;

[0017] Figure 2 is a connection schematic diagram of the grass head and the actuator;

[0018] Figure 3 is an internal structural schematic diagram of the mounting shell;

[0019] Figure 4 is a schematic diagram of the air duct trajectory of the lawn mower;

[0020] Figure 5 is a three-dimensional structural schematic diagram of the mounting shell;

[0021] Figure 6 is Figure 4 a cross-sectional structural schematic diagram of;

[0022] Figure 7 is an exploded connection schematic diagram of the output shaft and the limit ring.

[0023] In the figure, grass head 100; air outlet blade 101; grass string 102; grass beater shell 103; actuator 200; mounting shell 201; first flow cavity 202; air outlet cavity 203; second air outlet part 204; air inlet 205; first air outlet window 206; connecting ring 207; second flow cavity 208; second air outlet window 209; air outlet fan blade 210; enclosing plate 211; air inlet notch 212; limit ring 213; limit groove 214; limit pin 215; limit key 216; plugging counterbore 217; spring 218; internal thread 219; baffle 220; output shaft 221; connecting cavity 222. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following are specific embodiments of the present utility model in combination with the drawings, and the technical solutions of the present utility model will be further described, but the present utility model is not limited to these embodiments.

[0025] It should be noted that all the directional indicators (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative positional relationship, movement conditions, etc. between components in a certain specific posture (as shown in the attached drawings). If the specific posture changes, the directional indicators will also change accordingly.

[0026] As Figures 1-7 shown, a grass cutting head 100 includes:

[0027] A grass cutting shell 103, which is drivingly connected to the output shaft 221 of the actuator 200. A grass cutting rope 102 is arranged in the grass cutting shell 103, and the end of the grass cutting rope 102 passes through the grass cutting shell 103. A plurality of annularly spaced air outlet vanes 101 are integrally arranged on the upper end surface of the grass cutting shell 103;

[0028] Among them, as the grass cutting head 100 rotates, the air outlet vanes 101 rotate synchronously to realize air outlet around the grass cutting head 100.

[0029] In this embodiment, the air outlet vanes 101 integrally arranged on the upper end surface of the grass cutting shell 103 can be integrally injection-molded with the grass cutting shell 103 during production. Then, during the production and assembly process of the grass cutting head 100, there is no need to additionally add assembly steps, reducing the assembly process and saving assembly time; and when the grass cutting head 100 is working, the air outlet vanes 101 rotate to blow air around, blowing the grass debris cut by the grass cutting head 100 to the surrounding, which can prevent it from winding around the grass cutting head 100. And even if several of the air outlet vanes 101 are broken, the remaining air outlet vanes 101 can still remain on the grass cutting shell 103, maintaining the air outlet effect, not affecting the continued use of the grass cutting head 100, and not posing a safety hazard.

[0030] It is worth mentioning that the upper end surface of the grass cutting shell 103 refers to the upper end surface of the grass cutting shell 103 in the vertical direction when the grass cutting head 100 is working.

[0031] Further preferably, along the radial direction of the grass cutting shell 103, while the air outlet vanes 101 extend inwards, they gradually incline along the rotation direction of the output shaft 221.

[0032] In this embodiment, a plurality of air outlet vanes 101 are annularly spaced around the axis direction on the upper end surface of the grass cutting shell 103, and the length direction of the air outlet vanes 101 extends along its radial direction. Preferably, while the air outlet vanes 101 extend inwards, they gradually incline along the rotation direction of the output shaft 221 to increase the air outlet effect.

[0033] It is worth noting that the air outlet vanes 101 include air outlet plates, the air outlet plates are perpendicular to the upper end surface of the housing, and arc-shaped corners are arranged at the outer end surface corners of the air outlet plates.

[0034] A grass cutting actuator includes the above-mentioned grass cutting head 100, and further includes a mounting shell 201. An actuator 200 is arranged inside the mounting shell 201. The output shaft 221 of the actuator 200 passes through the mounting shell 201 and is connected to the grass cutting head 100. A first flow cavity 202 is formed between the mounting shell 201 and the actuator 200. An air outlet cavity 203 is formed between the mounting shell 201 and the grass cutting head 100. The air outlet blades 101 are located inside the air outlet cavity 203, and a second air outlet part 204 is further arranged on the mounting shell 201. The second air outlet part 204 is also located inside the air outlet cavity 203. An air inlet 205 is arranged on the mounting shell 201. A first air duct is formed among the air inlet 205, the first flow cavity 202 and the air outlet blades 101; a second air duct is formed among the air inlet 205, the first flow cavity 202 and the second air outlet part 204.

[0035] In this embodiment, the external air enters the first flow cavity 202 inside the mounting shell 201 through the air inlet 205 on the mounting shell 201. A part of the blown air entering the first flow cavity 202 is directly blown out through the second air outlet part 204 inside the air outlet cavity 203. This air path is the second air duct; another part of the blown air is blown out towards the direction of the air outlet blades 101 through the air outlet cavity 203 to increase the air outlet effect of the air outlet blades 101. This air path is the first air duct; the settings of the first air outlet part and the second air outlet part 204 enable two blown air flows to be formed during the working process of the grass cutting head 100. The two blown air flows cooperate with each other to increase the wind force effect of the blown air between the mounting shell 201 and the grass cutting head 100, and achieve a better anti-winding function.

[0036] It is worth mentioning that an extension connecting rod is arranged on the mounting shell 201. The extension connecting rod is for hand-held use and is hollow inside. An air inlet hole is opened on the extension connecting rod and is communicated with the air inlet 205 on the mounting shell 201 through the extension connecting rod, so that the air inlet area is far away from the grass cutting actuator to avoid inhaling grass clippings into the air inlet.

[0037] Specifically, the second air outlet part 204 includes a plurality of first air outlet windows 206 arranged at intervals in a ring shape at the bottom of the mounting shell 201. The blown air of the second air duct is finally blown out through the first air outlet windows 206.

[0038] Further preferably, along the direction of the grass cutting head 100 towards the mounting shell 201, the upper edge of the air outlet blades 101 is not lower than the lower edge of the first air outlet windows 206.

[0039] As a preferred solution, the upper edge of the air outlet blade 101 is higher than the lower edge of the air outlet window, so that the air blown out through the air outlet window blows directly to the surroundings respectively or blows out after the rotation of the air outlet blade 101. The air blown out through the upper part of the first air outlet window 206 can blow directly to the surroundings along the radial direction, while the air blown out through the lower part of the first air outlet window 206 preferably blows out after the rotation of the air outlet blade 101.

[0040] Specifically, a connecting ring 207 is integrally provided at the bottom of the installation shell 201. The first air outlet window 206 is arranged on the connecting ring 207, and a second flow cavity 208 is formed between the connecting ring 207 and the output shaft 221. The second flow cavity 208 is communicated with the first flow cavity 202 and the air outlet cavity 203.

[0041] As shown in Figure 4, in this embodiment, a connecting ring 207 is arranged on the installation shell 201 facing the grass cutting head 100. The first air outlet window 206 is opened on the annular wall of the connecting ring 207, and a gap is provided between the connecting ring 207 and the output shaft 221 to form a second flow cavity 208. A gap is also provided between the bottom wall of the connecting ring 207 and the grass cutting head 100. Then, the air in the first flow cavity 202 enters the second flow cavity 208, and then the blown air after the second flow cavity 208 is shunted. Part of it blows out to the surroundings through the first air outlet window 206, and part of it blows out towards the air outlet blade 101 through the gap between the connecting ring 207 and the grass cutting head 100.

[0042] Preferably, a second air outlet window 209 is provided on the side wall of the installation shell 201, and an air outlet fan blade 210 is further provided on the output shaft 221. The air outlet fan blade 210 is located inside the installation shell 201. The actuator 200 includes an actuator motor fixed inside the installation shell 201. A third air duct is formed between the air inlet 205, the actuator motor and the second air outlet window 209.

[0043] In this embodiment, the air entering the installation shell 201 through the air inlet 205 on the installation shell 201 will be shunted into two parts. One part is conveyed towards the air outlet blade 101 and the first air outlet window 206 through the first air outlet cavity 203, while the other part will pass through the actuator motor, take away the heat generated during the operation of the actuator motor, and then blow out through the second air outlet window 209, which can also play a role in preventing entanglement when taking away the heat of the actuator motor.

[0044] Specifically, an annular baffle 211 is provided inside the installation shell 201. The baffle 211 wraps around the actuator motor and is fixed to the actuator motor. At the upper edge of the baffle 211, a baffle plate 220 is integrally provided and fixed to the inner wall of the installation shell 201, separating the third air duct from the first flow cavity 202. An air inlet notch 212 is provided on the baffle plate 220 near the air inlet 205, connecting the air inlet 205 with the first flow cavity 202. That is, the air flowing into the installation shell 201, part of it passes through the air inlet notch 212 into the first flow cavity 202, and the other part directly passes through the upper part of the actuator motor and then enters the actuator motor, drives the heat of the actuator motor and then flows out through the second air outlet window 209.

[0045] It is worth mentioning that the number of baffles 211 is multiple, distributed along the axial direction of the actuator motor to ensure the connection stability between the baffle 211 and the installation shell 201. Then, an air inlet notch 212 is provided on each baffle plate 220 near the air inlet 205, so that the air at the air inlet 205 can smoothly pass through the first flow cavity 202.

[0046] As a preferred solution, the number of the second air outlet windows 209 is two, and the two second air outlet windows 209 are symmetrically arranged, and the two second air outlet windows 209 are respectively located on both sides of the first flow cavity 202 to prevent the first flow cavity 202 from communicating with the second air outlet window 209.

[0047] Further preferably, a limiting ring 213 is provided inside the installation shell 201. The limiting ring 213 is fixed to the output shaft 221. A limiting groove 214 is provided on the limiting ring 213, and a limiting pin 215 that can move linearly is provided on the installation shell 201. By pressing the limiting pin 215, the inner end of the limiting pin 215 can extend into the limiting groove 214, so that the relative position between the output shaft 221 and the installation shell 201 is fixed; the grass cutting head 100 is threadedly connected to the output shaft 221.

[0048] In this embodiment, an internal thread 219 is provided on the grass trimmer head 100, an external thread is provided at the end of the output shaft 221, a limit key 216 is provided in the middle of the output shaft 221, a connection cavity 222 is provided on the inner wall of the limit ring 213, the limit key 216 is engaged with the connection cavity 222, a U-shaped limit groove 214 is provided on the ring wall of the limit ring 213, a plugging counterbore 217 is provided on the housing wall of the mounting housing 201, the limit pin 215 is located in the plugging counterbore 217 and can approach or move away from the limit ring 213 relatively. A snap ring is provided at one end of the limit pin 215, and the snap ring abuts against the inner housing wall of the mounting housing 201 to prevent the limit pin 215 from disengaging from the plugging counterbore 217. An abutting portion is provided at the other end of the limit pin 215. A spring 218 is sleeved on the limit pin 215. One end of the spring 218 abuts against the hole wall of the plugging counterbore 217, and the other end of the spring 218 abuts against the abutting portion. Press the limit pin 215, the limit pin 215 approaches the limit ring 213 and extends into the limit groove 214, so that the relative position between the output shaft 221 and the mounting housing 201 is fixed. Then, rotate the grass trimmer head 100 in the reverse direction, and the grass trimmer head 100 can be removed.

[0049] It is worth mentioning that a first wind shield ring is provided at the bottom of the actuator 200, a second wind shield ring is integrally provided in the limit ring 213, the connection cavity 222 is located in the second wind shield ring, and a labyrinth cavity is formed among the first wind shield ring, the second wind shield ring and the limit ring 213, which can prevent air from entering the limit ring 213 and reduce the wind output force.

[0050] It is worth mentioning that the limit ring 213 is located outside the output shaft 221, so that the space of the third air outlet cavity 203 formed between the connection ring 207 and the output shaft 221 becomes smaller, so as to increase the wind speed of the passing air and achieve a better air outlet effect.

[0051] It should be noted that in the present utility model, descriptions such as "first", "second", and "one" are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. Terms such as "connection" and "fixation" should be understood in a broad sense. For example, "fixation" may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0052] In addition, the technical solutions between various embodiments of the present utility model can be combined with each other, but it must be based on what can be achieved by those of ordinary skill in the art. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0053] The specific embodiments described herein are merely illustrative of the spirit of the present utility model. Those skilled in the art to which the present utility model pertains can make various modifications or supplements to the described specific embodiments or use similar ways for substitution, but will not deviate from the spirit of the present utility model or exceed the scope defined by the appended claims.

Claims

1. A grass trimmer head, characterized in that: include: beat A grass shell is drivingly connected to the output shaft of the actuator, a grass rope is arranged in the grass shell, the end of the grass rope passes through the grass shell, and a plurality of air outlet blades distributed in an annular manner are integrally arranged on the upper end surface of the grass shell; Among them, as the grass trimmer head rotates, the air outlet blades rotate synchronously to achieve air outlet to the surroundings of the grass trimmer head.

2. A grass trimmer head according to claim 1, characterized in that: Along the radial direction of the mowing shell, each of the air outlet blades extends inwardly and gradually tilts along the rotation direction of the output shaft.

3. A grass cutting actuator, characterized in that: It comprises a grass trimming head as described in any one of claims 1-2 above.

4. A grass cutting actuator according to claim 3, characterized in that: It also includes a mounting shell, in which an actuator is arranged, and an output shaft of the actuator passes through the mounting shell and is connected to a grass trimmer head, a first circulation cavity is formed between the mounting shell and the actuator, an air outlet cavity is formed between the mounting shell and the grass trimmer head, the air outlet blades are located in the air outlet cavity, and a second air outlet portion is also arranged on the mounting shell, and the second air outlet portion is also located in the air outlet cavity, an air inlet is arranged on the mounting shell, a first air duct is formed between the air inlet, the first circulation cavity and the air outlet blades; a second air duct is formed between the air inlet, the first circulation cavity and the second air outlet portion.

5. A grass cutting actuator according to claim 4, characterized in that: The second air outlet portion includes a plurality of first air outlet windows arranged at intervals in an annular manner and arranged at the bottom of the mounting shell.

6. A grass cutting actuator according to claim 5, characterized in that: Along the direction from the mowing head to the mounting shell, the upper edge of the air outlet blade is not lower than the lower edge of the first air outlet window.

7. The grass cutting actuator according to claim 5, characterized in that: A connecting ring is integrally provided at the bottom of the mounting shell, the first air outlet window is provided on the connecting ring, and a second flow cavity is formed between the connecting ring and the output shaft, and the second flow cavity is communicated with the first flow cavity and the air outlet cavity.

8. The grass cutting actuator according to claim 4, characterized in that: A second air outlet window is arranged on the side wall of the mounting shell, and fan blades are also arranged on the output shaft. The fan blades are located in the mounting shell. The actuator includes an actuator motor fixed in the mounting shell, and a third air duct is formed between the air inlet, the actuator motor and the second air outlet window.

9. The grass cutting actuator according to claim 4, characterized in that: A limiting ring is arranged in the mounting shell, the limiting ring is fixed to the output shaft, a limiting groove is arranged on the limiting ring, and a limiting pin which can move linearly is arranged on the mounting shell, and the inner end of the limiting pin can be extended into the limiting groove by pressing the limiting pin, so that the relative position between the output shaft and the mounting shell is kept fixed; the mowing head and the output shaft are threadedly connected.

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