Grass trimming head and grass trimmer

Abstract

The utility model relates to the field of gardening tools, and particularly discloses a grass trimming head and a grass trimmer, and the grass trimming head comprises a machine shell, a motor installed in the machine shell, a grass trimming head assembly installed on one side of the machine shell and provided with rotation driving force by the motor, a motor support arranged on one side of the machine shell, and a separator arranged between the machine shell and the grass trimming head assembly. The rotating piece is installed on the inner side of the isolation piece, the isolation piece is a fan blade cover, the rotating piece is fan blades, a cutting piece is installed on the fan blade cover, and the isolation piece can guide heat dissipation airflow and can isolate and protect the fan blades at the same time. An air outlet is formed in the fan blade cover, and in the rotating process of the fan blades, air flow generated by the fan blades can be blown out from the inner side of the isolation piece to the outer side of the isolation piece through the air outlet; in the rotating process of the fan blades, the cutting piece can cut weeds on the inner side of the isolation piece, the cut weeds can be blown to the outer side of the isolation piece through airflow generated by the fan blades, and the problem that the weeds enter the grass trimming head to be wound around a line can be effectively solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of garden tools, especially to a grass beating head and a grass beater. BACKGROUND

[0002] The grass beater is one of the most basic garden tools, and has been developed for a long time, has many types and is widely used in many scenes. However, the grass beaters on the market often have the problem of grass winding around the working head during work due to the rotation of the working head. At this time, the machine is prone to stop, and the user needs to clean it manually. In addition, when the grass is wound around the working head for a long time, the machine shell or the fan blade may be worn out.

[0003] Through the understanding of the related technology, the grass beating head is mainly used to prevent grass winding by reducing the gap between the rotating grass beating head and the machine shell to prevent the grass from winding. However, this method is effective for grass with a relatively large diameter, and cannot avoid the problem of grass winding in complex working scenes. Moreover, the method of reducing the gap between the grass beating head and the machine shell is prone to cause poor heat dissipation of the equipment. SUMMARY

[0004] The purpose of at least one specific embodiment of the utility model is to solve the defects in the prior art and provide a grass beating head and a grass beater.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] A grass beating head comprises:

[0007] a machine shell;

[0008] a motor installed in the machine shell;

[0009] a grass beating head assembly installed on one side of the machine shell and provided with a rotating driving force by the motor;

[0010] an isolation piece is arranged between the machine shell and the grass beating head assembly, and a cutting piece is arranged on the isolation piece;

[0011] a rotating piece is installed on the inner side of the isolation piece, and the rotating piece is provided with a rotating driving force by the motor;

[0012] an air outlet is arranged on the isolation piece, and the airflow generated by the rotating piece during rotation can be blown out from the inner side to the outer side of the isolation piece through the air outlet;

[0013] during the rotation of the rotating piece, the cutting piece can cut the weeds on both sides of the isolation piece, and the cut weeds can be blown to the outer side of the isolation piece by the airflow generated by the rotating piece.

[0014] Further, the air outlet forms a first air duct for air outlet on the isolation piece;

[0015] The grass cutting head assembly is installed with a gap between the isolation member, the gap forms a second air duct for air outlet, and the airflow generated by the rotating member is blown out from the first air duct and the second air duct during rotation.

[0016] Further, the cutting member includes a lower cutting member located on the path of the second air duct;

[0017] The lower cutting member includes a first mounting portion and a first cutting portion, the first mounting portion is fixedly installed on the lower surface of the isolation member;

[0018] The first cutting portion is provided with a first cutting surface, and the first cutting surface faces the second air duct.

[0019] Further, the angle of the first cutting surface relative to the reference surface is α, 40°≤α≤50°.

[0020] Further, the grass cutting head assembly includes:

[0021] The grass cutting head seat is located on one side of the isolation member;

[0022] The grass cutting head cover is installed on one side of the grass cutting head seat;

[0023] The grass cutting member is installed on the grass cutting head seat, and the motor provides rotary driving force to the grass cutting member through the output shaft.

[0024] Further, after the grass cutting head seat is installed on one side of the isolation member, the gap between the side surface of the grass cutting head seat and the lower surface of the isolation member forms a second air duct, and the inclination angle of the first cutting surface is consistent with the inclination angle of the side surface of the grass cutting head seat.

[0025] Further, the rotating member is connected to the output shaft through a coupling, the coupling is provided with a top block, the top block is sleeved on the outside of the output shaft, and a fixing nut is installed on the output shaft;

[0026] The grass cutting member includes a spool, and the fixing nut and the spool are clamped on both sides of the top block to support the coupling and the rotating member.

[0027] Further, the grass cutting head cover is connected to the grass cutting head seat through a buckle assembly.

[0028] Further, the buckle assembly includes a buckle provided on one of the grass cutting head cover and the grass cutting head seat, and a buckle seat provided on the other of the grass cutting head cover and the grass cutting head seat, and the buckle and the buckle seat are buckled when the grass cutting head cover and the grass cutting head seat are connected.

[0029] Further, a motor support is installed on one side of the casing, and the upper surface of the isolation member is embedded into the motor support, so that the contact position of the isolation member and the motor support is sealed.

[0030] Further, the rotating member is a fan blade, and the isolating member is a fan blade cover, wherein the height of the fan blade is greater than the height of the air outlet, and the upper edge of the fan blade is covered by the fan blade cover or the motor support.

[0031] Further, the height of the air outlet is greater than 70% of the height of the fan blade.

[0032] Further, the motor support is provided with a latch opening, and a dismounting tool is adapted to be inserted into the latch opening to fix the output shaft of the motor, so that the grass cutting head assembly can be dismounted from the output shaft.

[0033] Further, the cutting member further comprises an upper cutting member and a lower cutting member, wherein the upper cutting member is installed on the upper surface of the isolating member, and the lower cutting member is installed on the lower surface of the isolating member.

[0034] The upper cutting member comprises a second mounting portion and a second cutting portion, and the second mounting portion is fixedly installed on the upper surface of the isolating member.

[0035] The second cutting portion is provided with a second cutting surface, and the inner wall of the motor support is provided with a cutting opening, and the second cutting surface extends into the inner side of the motor support through the cutting opening.

[0036] Further, the lower surface of the isolating member is provided with a limiting groove, and the first mounting portion of the lower cutting member is located in the limiting groove, and the limiting groove limits the lower cutting member.

[0037] The inner portion of the motor support is provided with a support seat, and the support seat is provided with a clamping groove, the second cutting portion of the upper cutting member is clamped with the clamping groove, and the support seat is adapted to limit the upper cutting member.

[0038] The upper cutting member and the lower cutting member are fixed on the isolating member by the same fixing member, and the first cutting surface and the second cutting surface are distributed on both sides of the central axis of the fixing member.

[0039] Further, the vertical plane in which the central axis of the output shaft of the motor is located is taken as a reference plane, and the angle of the second cutting surface relative to the reference plane is β, and 60°≤β≤120°.

[0040] Further, the region between the second cutting surface and the side surface of the second mounting portion of the second cutting portion is configured as an extension portion, the extension portion penetrates the cutting opening, and the second cutting surface extends into the inner side of the motor support.

[0041] The beneficial technical effects of the grass hitting head provided in the application are that: the isolating piece is arranged between the casing and the grass hitting head assembly of the grass hitting head, the cutting piece is mounted on the isolating piece, the rotating piece is mounted on the inner side of the isolating piece, and the air outlet is arranged on the isolating piece; in the process of rotation of the rotating piece, the airflow generated by the rotating piece can be blown out from the inner side to the outer side of the isolating piece through the air outlet; meanwhile, in the process of rotation of the rotating piece, the cutting piece can cut the grass on the inner side of the isolating piece, and the cut grass can be blown to the outer side of the isolating piece by the airflow generated by the rotating piece.

[0042] The application utilizes the rotating piece to form the outward heat dissipation airflow, prevents the grass from entering the interior of the grass hitting head, prevents the grass from winding around the output shaft of the motor, cuts the grass to be entered by the cutting piece, reduces the weight of the grass, and facilitates the airflow to remove the grass.

[0043] In addition, the isolating piece arranged in the application can guide the heat dissipation airflow and also isolate and protect the rotating piece.

[0044] Another technical scheme adopted by the application is to provide a grass hitting machine comprising the above grass hitting head.

[0045] The grass hitting machine provided in the application has the technical effects of the above grass hitting head due to the configuration of the above grass hitting head. BRIEF DESCRIPTION OF DRAWINGS

[0046] In order to more clearly illustrate the specific embodiments of the application or the technical schemes in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0047] Figure 1 It is a structure schematic view of the grass hitting head in an embodiment of the application.

[0048] Figure 2 It is a sectional view schematic view of the grass hitting head in an embodiment of the application.

[0049] Figure 3 It is an explosion schematic view of the grass hitting head in an embodiment of the application.

[0050] Figure 4 It is a local structure schematic view of the grass hitting head in an embodiment of the application.

[0051] Figure 5 It is a wind channel distribution schematic view of the grass hitting head in an embodiment of the application.

[0052] Figure 6The structure diagram of the grass cutting head in the embodiment of the application.

[0053] Figure 7 The assembly diagram of the grass cutting head seat and the grass cutting head cover in the embodiment of the application.

[0054] Figure 8 The structure diagram of the fan blade cover in the embodiment of the application.

[0055] Figure 9 The distribution diagram of the cutting member on the fan blade cover in the embodiment of the application.

[0056] Figure 10 The assembly diagram of the cutting member on the fan blade cover in the embodiment of the application.

[0057] Figure 11 The angle distribution diagram of the cutting member on the fan blade cover in the embodiment of the application.

[0058] Figure 12 The assembly diagram of the fan blade cover and the motor support in the embodiment of the application.

[0059] Figure 13 The structure diagram of the motor support in the embodiment of the application.

[0060] Figure 14 The structure diagram of the upper cutting member in the embodiment of the application. DETAILED DESCRIPTION

[0061] The technical solutions of the application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are some embodiments of the application, but not all the embodiments. Based on the embodiments in the application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0062] Embodiment 1

[0063] Reference Figure 1 , Figure 2 , Figure 3 A grass cutting head 100 comprises a casing 10, a motor 20 installed in the casing 10, a grass cutting head assembly 30 installed on one side of the casing 10 and provided with rotary driving force by the motor 20, a motor support 200 arranged on one side of the casing 10, a partition 50 arranged between the casing 10 and the grass cutting head assembly 30, and a rotary member 60 installed on the inner side of the partition 50. In the embodiment, the partition 50 is a fan blade cover 50, and the rotary member 60 is a fan blade 60. The rotary driving force of the fan blade 60 is provided by the motor 20. The cutting member 70 is installed on the fan blade cover 50. The partition 50 (the fan blade cover 50) can guide the heat dissipation airflow and protect the fan blade 60 at the same time.

[0064] The wind blade cover 50 is provided with an air outlet 501, and the airflow generated by the wind blade 60 during rotation can be blown out from the inside to the outside of the isolation piece through the air outlet;

[0065] During rotation of the wind blade 60, the cutting piece 70 can cut the weeds on both sides of the isolation piece, and the cut weeds can be blown to the outside of the isolation piece by the airflow generated by the wind blade 60.

[0066] In this embodiment, with reference to Figure 2 , Figures 4 to 7 , the grass hitting head assembly 30 includes a grass hitting head seat 301 arranged on one side of the wind blade cover 50, a grass hitting head cover 305 located on one side of the grass hitting head seat 301, and a grass hitting piece installed on the grass hitting head seat 301, wherein the rotating power of the grass hitting piece is provided by the output shaft 201 of the motor 20. In this embodiment, the grass hitting piece adopts a grass hitting rope structure, which includes a spool 302 installed at the end of the output shaft 201 of the motor 20 and threadedly connected thereto, a grass hitting rope 303 connected to the spool 302, a rope outlet sleeve 304 installed on the grass hitting head seat 301, and a lower cover 306 embedded on one side of the grass hitting head cover 305. The end of the grass hitting rope 303 is led out from the rope outlet sleeve 304, the outer edge of the spool 302 adopts a polygonal structure, the inside of the grass hitting head seat 301 is provided with a mounting hole 301a, and one side of the mounting hole 301a is provided with a limiting flange 301b.

[0067] The rope outlet sleeve 304 is installed at the wire outlet 301c of the grass hitting head seat 301, and the wire outlet 301c is provided with a limiting convex ridge 301d. The rope outlet sleeve 304 is provided with a limiting groove 304a, and the limiting groove 304a is matched with the limiting convex ridge 301d when the rope outlet sleeve 304 is installed at the wire outlet 301c.

[0068] Further, the grass hitting head cover 305 is connected with the grass hitting head seat 301 through a buckle assembly 80, the buckle assembly 80 includes a buckle 801 arranged on one of the grass hitting head cover 305 and the grass hitting head seat 301, and a buckle seat 802 arranged on the other of the grass hitting head cover 305 and the grass hitting head seat 301. In this embodiment, the buckle 801 is installed on the grass hitting head cover 305, the buckle seat 802 is installed on the grass hitting head seat 301, and the grass hitting head seat 301 is provided with a slot 803.

[0069] In addition, the wind blade 60 is connected with the output shaft 201 through a shaft coupling 90, the shaft coupling 90 is provided with a top block 90a, the top block 90a is sleeved on the outside of the output shaft 201, the output shaft 201 is provided with a fixing nut 202, and the fixing nut 202 and the spool 302 are clamped on both sides of the top block 90a, so as to support the shaft coupling 90 and the wind blade 60.

[0070] In some embodiments, a motor support 200 is mounted on one side of the casing 10, and the motor 20 is mounted on the motor support 200.

[0071] Specifically, when the grass head assembly 30 and the fan blade 60 are mounted on the output shaft 201, the coupling 90 is connected with the output shaft 201, the fan blade 60 is mounted on the coupling 90 by means of key connection or the like, the fixing nut 202 is threadedly connected to the output shaft 201 and axially fixes the fan blade 60 so that it can rotate with the output shaft 201, the fan blade cover 50 is sleeved on the periphery of the fan blade 60 and abuts against the end face of the motor support 200, and the top block 90a and the bobbin 302 are sequentially mounted on the output shaft 201, the fixing nut 202 is accommodated in the hole of the top block 90a after being mounted, the bobbin 302 is threadedly connected with the output shaft 201 and abuts against the top block 90a after being screwed, the mounted bobbin 302 is located in the mounting port 301a of the grass head seat 301, the inner wall of the mounting port 301a is provided with a polygonal structure matching the outer side of the bobbin 302, after the mounting port 301a is matched with the bobbin 302, the bobbin 302 and the grass head seat 301 are limited in the circumferential direction, and the limiting flange 301b is located on one side of the bobbin 302, the bobbin 302 limits the grass head seat 301 in the circumferential direction through the limiting flange 301b, the bobbin 302 and the grass head seat 301 are limited in cooperation, the output shaft 201 can drive the grass head seat 301 to rotate synchronously through the bobbin 302, and the grass head seat 301 will not fall off the output shaft 201.

[0072] After the grass head seat 301 is mounted, the limiting groove 304a on the out-of-line sleeve 304 is matched with the limiting convex rib 301d on the out-of-line port 301c, the out-of-line sleeve 304 is inserted into the out-of-line port 301c, the grass rope 303 on the bobbin 302 is led out of the out-of-line sleeve 304, the lower cover 306 is embedded from the inside of the grass head cover 305, the buckle 801 on the grass head cover 305 is inserted into the insertion slot 803 of the grass head seat 301, the top end flange of the buckle 801 is tightly buckled with the upper surface of the buckling seat 802, and the grass head cover 305 can be fixedly mounted on the grass head seat 301. At this time, the grass head assembly 30 can be assembled with the output shaft 201.

[0073] Further, when disassembling the grass head assembly 30, the output shaft 201 needs to be fixed, and the grass head seat 301 is rotated so that the spool 302 inside the grass head seat 301 is unscrewed from the output shaft 201. Since the output shaft 201 will also rotate together in the process of rotating the grass head seat 301, the output shaft 201 needs to be fixed in the process of disassembling the grass head assembly 30. In this embodiment, the motor support 200 and the coupling 90 are provided with corresponding pin holes 210. When disassembling the grass head assembly 30, a disassembly tool (such as a pin) needs to be manually inserted into the pin hole 210 to fix the output shaft 201. After the output shaft 201 is fixed, the grass head seat 301 is rotated, and the spool 302 is separated from the output shaft 201. Correspondingly, the entire grass head assembly 30 can be smoothly removed from the output shaft 201.

[0074] The specific details of the grass prevention will be described in detail below in combination with the working process of the grass head 100.

[0075] After the motor 20 is started, it drives the fan blade 60 to rotate through the coupling 90. The output shaft 201 of the motor 20 simultaneously drives the spool 302 and the grass head seat 301 to rotate synchronously. At this time, the grass rope 303 rotates at high speed together. The high-speed rotating grass rope 303 has a high-efficiency grass cutting effect. The grass rope 303 rotates at high speed in the process of cutting grass, and the fan blade 60 also rotates at high speed synchronously. The airflow generated by the rotation of the fan blade 60 flows out of the air outlet 501 at high speed. Therefore, the air outlet 501 forms a first air duct 50a for air outlet on the fan blade cover 50.

[0076] Moreover, after the grass head assembly 30 is installed, the upper surface of the fan blade cover 50 is embedded into the motor support 200, so that the contact position of the fan blade cover 50 and the motor support 200 forms a seal to prevent grass clippings from entering the motor support 200. The fan blade cover 50 is symmetrically distributed with four screw positions, which minimizes the deformation of the fan blade cover 50. A mounting position of the cutting member 70 is reserved on one screw position to facilitate the installation of the cutting member 70.

[0077] Moreover, the air outlet 501 of the fan blade cover 50 is designed with appropriate dimensions according to the fan blade 60, which can completely wrap the fan blade 60. The fan blade cover 50 is optimized to eight air outlet ribs, which takes into account the mold outlet and air outlet efficiency.

[0078] In addition, with reference to Figure 5, the gap between the grass head base 301 and the blade cover 50 forms a second air duct 50b for air outlet, and the airflow generated by the rotation of the blade 60 is blown out from the first air duct 50a and the second air duct 50b, wherein the airflow blown out from the first air duct 50a is relatively strong, and the airflow blown out from the second air duct 50b is relatively weak. During the grass cutting process, the airflow blown out from the first air duct 50a and the second air duct 50b can not only take away the heat inside the entire grass head assembly 30, but also blow the heat to the outside of the blade cover 50, so as to blow away the weeds outside the blade cover 50 and prevent the weeds from entering the inside of the grass head and winding the output shaft 201.

[0079] With reference to Figures 8 to 12 Since most of the heat dissipation airflow is discharged through the first air duct 50a, and a small part is discharged from the second air duct 50b, the first air duct 50a has a strong sweeping effect on the weeds outside, and the second air duct 50b has a weak sweeping effect on the weeds outside. Therefore, the cutting member 70 is installed on the blade cover 50, and the cutting member 70 includes a lower cutting member 701 and an upper cutting member 702. The lower cutting member 701 is arranged below the blade cover 50, i.e. on the second air duct 50b, and has little effect on heat dissipation. Since the first air duct 50a realizes the main heat dissipation function, the installation of the cutting blade will block the airflow and greatly affect the heat dissipation effect, resulting in a too high temperature of the motor during use. In addition, the first air duct 50a is directly opposite to the internal blade 60, and the airflow is large, so it is easier to blow away the weeds. The second air duct 50b is located obliquely below the blade 60, and the airflow is small, so the blowing effect on the larger weeds is poor. After the lower cutting member 701 is installed at the position of the second air duct 50b, the weeds blown away at the second air duct 50b can be cut by the lower cutting member 701, so as to reduce the weight of the weeds and facilitate the blowing away of the weeds by the airflow of the second air duct 50b, thereby preventing the weeds from entering the inside of the grass head through the gap between the grass head base 301 and the blade cover 50 and winding the output shaft 201.

[0080] Specifically, in the present embodiment, the lower cutting member 701 includes a first mounting portion 701a and a first cutting portion 701b. The first mounting portion 701a is fixedly installed on the lower surface of the blade cover 50, and the first cutting portion 701b has a first cutting surface 701c facing the second air duct 50b.

[0081] Further, with reference to Figure 11With the vertical plane where the central axis 300 of the output shaft 201 of the motor is located as the reference surface 400, the angle of the first cutting surface 701c relative to the reference surface 400 is a, 40°≤a≤50°, the inclination angle of the first cutting surface 701c tends to be consistent with the inclination angle of the side surface of the grass head seat 301. This angle can not only better fit the grass head seat 301, maximize the gap between the grass head seat 301 and reduce the probability of grass entering and entangling, but also maximize the effective cutting length during operation. In the present embodiment, the size of the angle a of the first cutting surface 701c relative to the reference surface 400 depends on the inclination angle of the top side surface of the grass head seat 301. When a = 40°, the inclination angle of the top side surface of the grass head seat 301 tends to be 40°, and when a = 50°, the inclination angle of the top side surface of the grass head seat 301 tends to be 50°.

[0082] It should be noted that the lower cutting member 701 and the upper cutting member 702 adopt a structure similar to a blade. The cutting surface of the lower cutting member 701 and the upper cutting member 702 is not provided with a cutting edge to prevent danger during disassembly. In the case of high-speed operation of the grass head, the grass that hits the lower cutting member 701 and the upper cutting member 702 can be cut off without using a blade with a cutting edge.

[0083] Further, in some embodiments, referring to Figure 9 The height h1 of the fan blade 60 is greater than the height h2 of the air outlet 501, and the upper edge of the fan blade 60 is covered by the fan blade cover 50 or the motor bracket 200 to prevent grass from entering the fan blade from above the fan blade 60. Specifically, taking the actual designed size as an example, the height of the air outlet 501 is 7-9 mm, the height of the fan blade 60 is 10 mm, and the upper edge of the fan blade 60 needs to be covered by more than 1 mm to prevent grass from entering from above the fan blade 60. After the upper edge of the fan blade 60 is blocked, the height of the air outlet 501 needs to be at least 70% of the height of the fan blade 60 to ensure the air outlet efficiency while not affecting the heat dissipation of the fan blade 60.

[0084] Further, since the motor bracket 200 and the coupling 90 are provided with corresponding pin holes 210, a disassembly tool is adapted to be inserted into the pin holes 210 to fix the output shaft 201 of the motor, so that the grass head assembly 30 can be disassembled from the output shaft 201. Because of the existence of the pin holes 210, grass may enter the grass head from there. Therefore, the cutting member 70 further comprises an upper cutting member 702, which is installed on the upper surface of the fan blade cover 50.

[0085] The upper cutting member 702 comprises a second mounting portion 702a and a second cutting portion 702b, and the second mounting portion 702a is fixedly installed on the upper surface of the fan blade cover 50.

[0086] Referring to Figure 11, the second cutting part 702b is provided with a second cutting surface 702c, and the angle of the second cutting surface 702c relative to the reference surface 400 is β, 60°≤β≤120°, when β=60°, the angle of the second cutting surface 702c relative to the reference surface 400 is an acute angle, and the second cutting surface 702c can cut weeds; when β=120°, the angle of the second cutting surface 702c relative to the reference surface 400 is an obtuse angle, and the second cutting surface 702c can also cut weeds, in the embodiment, β is preferably 90°, which can ensure the longest effective cutting length of the upper cutting part 702 in the working process while controlling the minimum gap between the upper cutting part 702 and the fan blade 60.

[0087] With reference to Figure 13 , Figure 14 The inner wall of the motor support 200 is provided with a cutting opening 220, and the second cutting surface 702c extends into the inner side of the motor support 200 through the cutting opening 220. Specifically, the region between the second cutting surface 702c and the side surface of the second mounting part 702a on the second cutting part 702b is configured as an extension part 702d, the length of the extension part 702d is 1.7-3mm, and the extension part 702 of the upper cutting part 702 can penetrate through the cutting opening 220 after installation, and the second cutting surface 702c extends into the inner side of the motor support 200. The extension part 702d is designed to make the second cutting surface 702c not be blocked by positioning and normally function, and the extension part 702d is arranged to form a closer fitting relationship between the upper cutting part 702 and the motor support 200, which helps to enhance the compactness of the assembly between the upper cutting part 702 and the motor support 200 while realizing the expansion of the cutting function.

[0088] In addition, the upper cutting part 702 is also provided with a positioning notch 702e of 3×3.5mm, and when the second mounting part 702a is fixedly installed on the upper surface of the fan blade cover 50 by a screw, the positioning notch 702e can be positioned and engaged with the inner wall of the motor support 200. Through the design of the positioning notch 702e, the material and weight are reduced, and the positioning is optimized, and one screw can be used to fix the upper cutting part 702 without deflection.

[0089] Further, the lower surface of the fan blade cover 50 is provided with a limiting groove 502, and the first mounting part 701a of the lower cutting part 701 is located in the limiting groove 502, and the limiting groove 502 limits the lower cutting part 701 in the circumferential direction.

[0090] The inner part of the motor support 200 is provided with a support seat 230, the support seat 230 is provided with a clamping groove 240, the second cutting part 702b of the upper cutting part 702 is clamped with the clamping groove 240, and the support seat 230 can limit the upper cutting part 702 in the circumferential direction.

[0091] Since the lower cutting member 701 is circumferentially limited by the limiting groove 502, and the upper cutting member 702 is circumferentially limited by the support seat 230, the upper cutting member 702 and the lower cutting member 701 only need to be fixed on the impeller cover 50 by the same fixing member 500. Compared with the traditional way of installing multiple fixing members and performing complex circumferential positioning, the installation steps and time are greatly reduced, and the installation efficiency is improved. During installation, the upper and lower cutting members do not need to be positioned and fixed circumferentially, which reduces the requirement for installation technology and experience, making the installation process easier and more convenient.

[0092] Moreover, the lower cutting member 701 is circumferentially limited by the limiting groove 502, and the upper cutting member 702 is circumferentially limited by the support seat 230. This double limiting method can ensure the accurate circumferential position of the upper and lower cutting members after installation, avoiding problems such as uneven cutting and increased vibration caused by circumferential displacement of the blades during use, thereby ensuring the stability of the mowing effect.

[0093] Moreover, the motor bracket 200 also has a screw column 250 inside. After the fixing member 500 penetrates the upper cutting member 702 and the lower cutting member 701, the end thereof extends into the interior of the motor bracket 200 and is screwed with the screw column 250. The upper cutting member 702 and the lower cutting member 701 are fixed by the same fixing member 500, so that the upper and lower cutting members form a whole on the impeller cover 50 and bear force together. Compared with the separate fixing method, it can better resist various external forces generated during mowing, such as centrifugal force and impact force, reduce the possibility of blade loosening, improve the stability and reliability of installation, and prolong the service life of the blade. The fixing member 500 is a screw.

[0094] In addition, after the installation of the upper cutting member 702 and the lower cutting member 701, the first cutting surface 701c and the second cutting surface 702c are distributed on both sides of the central axis of the fixing member 500. During mowing, when the blades are subjected to external forces such as resistance from the grass, the external forces on the cutting surfaces on both sides can be balanced to some extent, which helps to maintain the stability of the entire cutting member assembly during cutting, and reduces vibration and shaking caused by uneven force.

[0095] In summary, the impeller cover 50 is provided between the casing 10 and the mowing head assembly 30 of the mowing head. The impeller 60 is installed on the inner side of the impeller cover 50. The impeller cover 50 is provided with an air outlet 501. During rotation of the impeller 60, the airflow generated thereby can be blown out from the inner side to the outer side of the impeller cover 50 through the air outlet 501. The outward heat dissipation airflow formed by the rotation of the impeller 60 prevents weeds from entering the interior of the mowing head and prevents weeds from winding around the output shaft 201 of the motor.

[0096] Moreover, the lower cutting member 701 and the upper cutting member 702 are further installed on the blade cover 50, and the lower cutting member 701 and the upper cutting member 702 can cut the weeds inside the blade cover 50 in the process of the rotation of the blade 60, so as to reduce the weight of the weeds, and the cut weeds can be blown to the outside of the blade cover 50 by the airflow generated by the blade 60, so as to facilitate the airflow to remove the weeds.

[0097] Embodiment 2

[0098] Based on the same technical concept, the embodiment of the application provides a grass trimmer, which comprises the grass trimming head 100 in the above embodiment, and has the effects of the grass trimming head 100 correspondingly. The grass trimmer utilizes the rotation of the blade 60 inside the grass trimming head to form an outward heat dissipation airflow, prevents the weeds from entering the inside of the grass trimming head 100, prevents the weeds from winding around the output shaft of the motor, cuts the weeds that are about to enter by the cutting member, reduces the weight of the weeds, and facilitates the airflow to remove the weeds.

[0099] 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: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the application.

Claims

1. A grass cutting head, comprising: a housing; a motor installed in the housing; a grass cutting head assembly installed on one side of the housing and provided with a rotating driving force by the motor; characterized in that an isolator is arranged between the housing and the grass cutting head assembly, and a cutting element is arranged on the isolator; a rotating element is installed on the inner side of the isolator, and the rotating element is provided with a rotating driving force by the motor; an air outlet is arranged on the isolator, and air flow generated by the rotating element during rotation can be blown out from the inner side to the outer side of the isolator through the air outlet; the cutting element can cut weeds on both sides of the isolator during rotation of the rotating element, and the cut weeds can be blown to the outer side of the isolator by the air flow generated by the rotating element.

2. The grass cutting head of claim 1, wherein, the air outlet forms a first air duct for air outlet on the isolator; after the grass cutting head assembly is installed, a gap is formed between the grass cutting head assembly and the isolator, and the gap forms a second air duct for air outlet, and air flow generated by the rotating element during rotation is blown out from the first air duct and the second air duct.

3. The grass cutting head of claim 2, wherein, the cutting element includes a lower cutting element, and the lower cutting element is located on the path of the second air duct; the lower cutting element includes a first mounting portion and a first cutting portion, and the first mounting portion is fixedly installed on the lower surface of the isolator; the first cutting portion has a first cutting surface, and the first cutting surface faces the second air duct.

4. The grass cutting head of claim 3, wherein, With the vertical plane in which the central axis of the output shaft of the motor is located as a reference plane, the angle of the first cutting surface relative to the reference plane is α, and 40°≤α≤50°.

5. The grass cutting head of claim 3, wherein, the grass cutting head assembly comprises: a grass cutting head base located on one side of the isolator; a grass cutting head cover installed on one side of the grass cutting head base; a grass cutting element installed on the grass cutting head base, and the motor provides a rotating driving force to the grass cutting element through an output shaft.

6. The grass cutting head of claim 5, wherein, after the grass cutting head base is installed on one side of the isolator, the gap between the side surface of the grass cutting head base and the lower surface of the isolator forms the second air duct, and the inclination angle of the first cutting surface is consistent with the inclination angle of the side surface of the grass cutting head base.

7. The grass trimming head of claim 5, wherein, the rotating element is connected to the output shaft through a coupling, the coupling has a top block, the top block is sleeved on the outer side of the output shaft, and a fixing nut is installed on the output shaft; the grass cutting element includes a spool, and the fixing nut and the spool are clamped on both sides of the top block to support the coupling and the rotating element.

8. The grass trimming head of claim 5, wherein, the grass cutting head cover is connected to the grass cutting head base through a buckle assembly; the buckle assembly includes a buckle arranged on one of the grass cutting head cover and the grass cutting head base, and a buckle seat arranged on the other of the grass cutting head cover and the grass cutting head base, and the buckle and the buckle seat are buckled when the grass cutting head cover and the grass cutting head base are connected.

9. The grass trimming head of claim 3, wherein, a motor support is installed on one side of the housing, and the upper surface of the isolator is embedded in the motor support, so that the contact position of the isolator and the motor support forms a seal.

10. The grass trimming head of claim 9, wherein, The rotating member is a fan blade, and the isolation member is a fan blade cover, wherein the height of the fan blade is greater than the height of the air outlet, and the upper edge of the fan blade is covered by the fan blade cover or the motor support.

11. The grass trimming head of claim 10, wherein, The height of the air outlet is greater than 70% of the height of the fan blade.

12. The grass trimming head of claim 9, wherein, The motor support is provided with a latch opening, and a dismounting tool is adapted to be inserted into the latch opening to fix the output shaft of the motor, so that the grass cutting head assembly can be dismounted from the output shaft.

13. The grass trimming head of claim 12, wherein, The cutting member further comprises an upper cutting member mounted on the upper surface of the isolation member, and a lower cutting member mounted on the lower surface of the isolation member. The upper cutting member comprises a second mounting portion and a second cutting portion, and the second mounting portion is fixedly mounted on the upper surface of the isolation member. The second cutting portion is provided with a second cutting surface, and the inner wall of the motor support is provided with a cutting opening, and the second cutting surface extends into the inner side of the motor support through the cutting opening.

14. The grass trimming head of claim 13, wherein, The lower surface of the isolation member is provided with a limiting groove, and the first mounting portion of the lower cutting member is located in the limiting groove, and the limiting groove limits the lower cutting member. The inner portion of the motor support is provided with a support seat, and the support seat is provided with a clamping groove, and the second cutting portion of the upper cutting member is clamped with the clamping groove, and the support seat is adapted to limit the upper cutting member. The upper cutting member and the lower cutting member are fixed to the isolation member by the same fixing member, and the first cutting surface and the second cutting surface are distributed on both sides of the central axis of the fixing member.

15. The grass trimming head of claim 13, wherein, With the vertical plane in which the central axis of the output shaft of the motor is located as a reference plane, the angle of the second cutting surface relative to the reference plane is β, and 60°≤β≤120°.

16. The grass trimming head of claim 13, wherein, The area between the second cutting surface and the side surface of the second mounting portion on the second cutting portion is configured as an extension portion, the extension portion penetrates the cutting opening, and the second cutting surface extends into the inner side of the motor support.

17. A grass trimmer characterized by comprising: The grass cutting head comprises the grass cutting head according to any one of claims 1-16.

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