Brush cutter head

Abstract

The brush cutter head comprises a shaft connecting part connected with a gear head, a blade is installed below the shaft connecting part, the upper portion of the shaft connecting part is connected with the gear head, the gear head is further connected with an operation rod, and a protection disc is arranged between the blade and the shaft connecting part. Radiation strips are arranged on the outer edge of the protection disc, strip bodies at the outer ends of the radiation strips are bent and extend towards the outer side of the blade to form a protection area on the periphery of a blade rotary cutting area, and an operation object enters the blade rotary cutting area through outer end gaps between the radiation strips located in the protection area. The outer end of the protection disc bends and extends towards the outer side of the blade to form a protection area, so that a tree is blocked outside a rotary cutting area of the blade by radiation strips of the protection area when the periphery of the tree is rotationally cut, and the tree cannot be damaged; the outer end gaps between the radiation strips in the protection area can allow weeds, shrubs and branches and branches to enter the blade rotary cutting area to be rotationally cut by the blades, the structure is ingenious, the garden working efficiency is improved, and the corresponding operation cost is reduced.

Description

Technical Field

[0001] The utility model relates to a head of a garden machine, in particular to a head of a brush cutter, and belongs to the technical field of IPC No. A01D. Background Art

[0002] In garden maintenance work, brush cutters are indispensable tools that can efficiently trim and clean bushes to keep the surroundings clean and beautiful. Brush cutter heads are designed in various ways to meet different operational needs. Among them, heads with strip blades and disc blades are widely used due to their efficient cutting capabilities, while heads with nylon lines are suitable for complex terrain and environments with obstacles to ensure the safety of operations.

[0003] However, there are still some problems in the practical application of existing brush cutters. For example, when using a working head with a strip blade or a disc blade to operate, it is often difficult for the operator to accurately control the machine, especially when it is necessary to get close to the tree to trim the weeds or shrubs around the tree, it is easy for the working head to touch the tree while trimming, thereby accidentally cutting the tree and affecting its growth. In addition, some trees will grow some small forks upward from the roots, and some joints on the tree will also grow some small branches. When approaching the part with forks or branches of the tree, it is really difficult for the strip blade or the disc blade to ensure that the tree is not cut while trimming. Moreover, the forks of some shrubs or trees are very tough, and the strip blade or the disc blade cannot cut them off at one time when trimming, which causes the forked branches of the shrubs or trees to fall over. When the working head no longer applies force, these forked branches of the shrubs or trees will rebound, causing the mowing head to be subjected to external force, greatly affecting the user's control of the handle of the brush cutter, which also causes these areas to be unable to be effectively cleaned. These problems not only affect the efficiency of gardening work, but also increase maintenance costs. Summary of the invention

[0004] The utility model aims to solve the problem that the existing brush cutters are used to remove weeds, shrubs or tree forks near trees other than the trees themselves without damaging the tree body, and provides a brush cutter head with protective measures to make it easier to cut shrubs or tree forks.

[0005] The technical solution to the problem to be solved by the utility model is as follows:

[0006] A brush cutter head, the head includes an axial connection part connected to a gear head, a blade is installed below the axial connection part, the upper part of the axial connection part is connected to the gear head, and the gear head is further connected to an operating rod, characterized in that: a protective plate is provided between the blade and the axial connection part; the outer edge of the protective plate is provided with radiating strips, the outer end strips of the radiating strips are bent and extended toward the outside of the blade to form a protective area outside the blade cutting area, and the outer end gaps between the radiating strips in the protective area are used for the working object to enter the blade cutting area.

[0007] Preferably, the inner end gap between the inner ends of the radiation strips is projected within the blade cutting area, and the inner end gap is communicated with the outer end gap located in the protection area to form a limited working area for the working object to approach.

[0008] Preferably, a chain or rope is connected between the gear head and the protective disk to prevent the protective disk from rotating, and one end of the chain is fixed to the side of the gear head and the other end is fixed to the protective disk.

[0009] Preferably, a portion of the cover body is extended from the shell cover of the gear head to the protective plate, and the protective plate is fixed to the extended portion of the cover body.

[0010] Preferably, the shaft connection part includes a main shaft sleeve that is deeply inserted into the shaft groove at the end of the main shaft for the blade to rotate and is connected to the shaft cap and locked on the outside of the main shaft end. The shaft pin at the other end of the main shaft is successively placed on the protective plate and the retaining spring behind the bearing. A pressure cover that covers the bearing and the retaining spring and is connected to the protective plate at the inner bottom is also provided on the outside of the bearing and the retaining spring. The blade is then put on the main shaft shaft pin part exposed from the pressure cover and finally the self-locking nut is put on to lock the blade on the main shaft shaft pin.

[0011] Preferably, the radiation strip is a flat narrow side strip, and the size of the gap in the protection area formed at the outer end of the radiation strip is equivalent to the width of the radiation strip.

[0012] The beneficial effects of the utility model are as follows:

[0013] Compared with the prior art, the utility model adopts a protective plate with radiating strips, and the outer ends of the radiating strips are bent and extended toward the outside of the blade to form a protective area, so that when the weeds, shrubs and branches around the trees are cut, the trees are blocked by the radiating strips in the protective area outside the cutting area of ​​the blade, and no damage is caused to the trees. The outer end gaps between the radiating strips in the protective area can allow these weeds, shrubs and tree branches to enter the cutting area of ​​the blade and be cut by the blade. The structure is ingenious, and they can be screened through the intervals of the radiating strips, so that workers can work directly on the area around the trees with peace of mind during operation, which significantly improves the work efficiency of the garden and reduces the corresponding operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0015] Figure 1 It is a structural schematic diagram of the utility model;

[0016] Figure 2 yes Figure 1 A schematic diagram of the structure from another angle;

[0017] Figure 3 yes Figure 1 Schematic diagram of the structural decomposition. DETAILED DESCRIPTION

[0018] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0019] The following will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, that is, a large number of specific details are given to provide a more thorough understanding of the present invention. However, for those skilled in the art, the present invention can be implemented without one or more of these details. In these examples, in order to avoid confusion with the present invention, some technical features known in the art are not described.

[0020] It should be understood that the present invention can be implemented in different forms and should not be construed as being limited to the embodiments presented herein. Therefore, they are only used as examples and cannot be used to limit the scope of protection of the present invention.

[0021] In addition, it should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by technicians in the field to which the utility model belongs.

[0022] See also Figures 1 to 3 The brush cutter head, as a key component of the garden maintenance tool brush cutter, is designed to improve operating efficiency and ensure operational installation. The head includes a shaft connection part 2 connected to a gear head 1, a blade 3 is precisely docked and installed at the bottom of the shaft connection part 2, and the shaft connection part 2 is connected to the gear head 1 at the top. The gear head 1 is then connected to an operating lever (not shown) to transmit the operator's power synchronously, thereby achieving precise control of the brush cutter.

[0023] In order to protect trees and shrubs and avoid unnecessary damage during pruning, a protective plate 4 is specially added to the design of the machine head. A protective plate 4 is provided between the blade 3 and the shaft connection part 2; the outer edge of the protective plate 4 is provided with a radial strip 41, and the outer end strip body 42 of the radial strip 41 is bent and extended toward the outside of the blade 3 to form a protective area B outside the blade rotary cutting area A. The outer end gap 43 between the radial strips 41 in the protective area B is for the work object to enter the blade rotary cutting area A. In this protective area B, the design requirement of the outer end gap 43 between the radial strips 41 is that the straight lines connecting the two sides of the gap 43 cannot fall into the blade rotary cutting area A, and within this range, the gap can be set to the maximum to allow the work object to smoothly enter the blade rotary cutting area A while ensuring the safety of the operation.

[0024] Before implementation, the blade 3 is usually preferably a strip blade. Of course, a disc blade can also be used, but the disc blade cannot further trim some branches extending from the side of the tree to the root of the branch because of the setting of the protective disk 4. If a strip blade is used, after the redundant branches are cut, when the root of the branch needs to be further trimmed, the entire head angle can be perpendicular to the root of the branch, that is, the blade cutting area A is perpendicular to the root of the branch, and then the operating lever is controlled to touch the root of the branch by multiple light touches and downward pressures. In this way, the gap of the strip blade during rotation can allow the exposed part of the root of the branch to enter the blade cutting area A from the lower open area of ​​the blade cutting area A so that it can be cut and trimmed by the blade.

[0025] During implementation, the radiation strips 41 provided on the outer periphery of the protection plate 4 can be provided only on the working travel surface of the machine head. In addition, the protection plate is preferably fixed and does not rotate during operation, so that when the machine head caters to weeds, shrubs and tree branches, these working objects can enter smoothly.

[0026] Furthermore, as an improvement to the present invention, the inner end gap 45 between the inner ends 44 of the radiation strips 41 is projected within the blade cutting area A, and the inner end gap 45 is connected with the outer end gap 43 located in the protection area B to form a limited working area 43-45 for the working object to approach.

[0027] In this embodiment, the limited working area 43-45 can trap weeds, shrubs, tree forks, branches, etc. When the blade 3 in the blade cutting area A rotates to this area, due to the inner end of the radial strips 41 on both sides of the limited working area 43-45 and the side limit of the radial strips 41 at the outer end, the blade 3 can cut to the surface of the working object, and the working object cannot be tilted due to the cutting force of the blade 3, so the blade 3 can easily and smoothly cut the working object.

[0028] Furthermore, as an improvement to the present invention, a chain 5 or a rope is connected between the gear head 1 and the protective plate 4 to prevent the protective plate 4 from rotating. One end of the chain 5 or the rope is fixed to the side of the gear head 1 and the other end is fixed to the protective plate 4.

[0029] In this embodiment, if the gear head 1 adopts a traditional structure, which is commercially available or homemade, after the protective plate 4 is installed on such a gear head 1, during operation, the protective plate 4 will rotate with the transmission of the gear head 1. Through the setting of the chain 5, the protective plate 4 can be conveniently positioned to provide a pulling force, and it has the strength to prevent it from breaking due to external forces, thereby ensuring the long-term connection between the two.

[0030] Furthermore, as an improvement to the present invention, a portion of the cover body is extended from the shell cover of the gear head 1 to the protective plate 4 and the protective plate 4 is fixed to the extended portion of the cover body.

[0031] In this embodiment, the cover is connected to the protective plate 4, and the gear head 1 transmits the transmission to the blade 3, which can well achieve the purpose of the protective plate 4 not moving and cooperating with the blade 3 to operate in the rotary cutting area A.

[0032] Furthermore, as an improvement to the present invention, the shaft connection part 2 includes a main shaft sleeve 23 that is locked on the outside of the main shaft 21 end after being connected to a shaft cap 22 that is inserted into an shaft groove at the end of a main shaft 21 for the blade 3 to rotate. The shaft pin 211 at the other end of the main shaft 21 is placed on the protective plate 4 and the retaining spring 7 behind the bearing 6 in sequence. A pressure cover 8 that is connected to the protective plate 4 and covers the bearing 6 and the retaining spring 7 at the inner bottom is also provided on the outside of the bearing 6 and the retaining spring 7. The main shaft shaft pin part exposed by the pressure cover 8 is then put on the blade 3 and finally the self-locking nut 9 is put on to lock the blade 3 on the main shaft shaft pin 211.

[0033] In this embodiment, the main shaft pin 211 is connected to the transmission pin of the gear head 1 in the shaft groove at the end of the main shaft 21 to receive the transmission rotation force, and the main shaft pin 211 is installed with the blade 3, so the gear head 1 can indirectly drive the blade 3 to rotate. Because the bearing 6 is provided, the protection plate 4 will not affect the rotation of the blade 3 even if its rotation is restricted by external force during operation.

[0034] Furthermore, as an improvement to the present invention, the radiation strip 41 is a flat narrow side strip, and the size of the gap 43 in the protection area formed at the outer end of the radiation strip 41 is equivalent to the width of the radiation strip 41 .

[0035] In the implementation method, relatively speaking, when the size of the gap 43 is equal to the width of the radius 41, the operation safety of the machine head is better. Of course, some other special cases are excluded.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. 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 utility model, and they should all be included in the scope of the claims and specification of the utility model.

Claims

1. A brush cutter head, the head comprising a shaft connecting part connected to a gear head, a blade being installed below the shaft connecting part, the shaft connecting part being connected to the gear head above, and the gear head being connected to an operating rod, characterized in that: A protective plate is provided between the blade and the shaft connection part; the outer edge of the protective plate is provided with radial strips, and the outer end strips of the radial strips are bent and extended toward the outside of the blade to form a protective area outside the blade cutting area. The outer end gaps between the radial strips in the protective area are used for the working object to enter the blade cutting area.

2. The brush cutter head according to claim 1, characterized in that: The inner end gap between the inner ends of the radiation strips is projected within the blade rotary cutting area, and the inner end gap is communicated with the outer end gap located in the protection area to form a limited working area for the working object to approach.

3. The brush cutter head according to claim 1, characterized in that: A chain or rope is also connected between the gear head and the protection plate to prevent the protection plate from rotating. One end of the chain is fixed to the side of the gear head, and the other end is fixed to the protection plate.

4. The brush cutter head according to claim 1, characterized in that: A portion of the cover body is extended from the shell cover of the gear head to the protection plate, and the protection plate is fixed to the extended portion of the cover body.

5. The brush cutter head according to claim 1, characterized in that: The shaft connection part includes a main shaft that penetrates deep into the shaft groove for the blade to rotate. After the shaft cap at the end of the main shaft is connected, a main shaft sleeve is locked on the outside of the main shaft end. The shaft pin at the other end of the main shaft is placed on the protective plate and the retaining spring behind the bearing in sequence. A pressure cover connected to the protective plate that covers the bearing and the retaining spring at the inner bottom is also provided on the outside of the bearing and the retaining spring. The blade is then put on the main shaft shaft pin part exposed from the pressure cover and finally the self-locking nut is put on to lock the blade on the main shaft shaft pin.

6. The brush cutter head according to claim 1, characterized in that: The radiation strip is a flat narrow side strip, and the gap size of the protection area formed at the outer end of the radiation strip is equivalent to the width of the radiation strip.

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