Grass chopping cutter head of hedge trimmer

Abstract

The utility model discloses a hedge trimmer grass chopping cutter head which comprises a cylindrical shell with an opening in one side, a cutter shaft is axially arranged in the middle of the shell, a blade with the upper middle portion bent is arranged on the cutter shaft, and the upper middle portion of the blade is bent in the axial direction of the cutter shaft. Every two blades are symmetrically arranged and bent back to back to form a grass chopping unit, the grass chopping units are evenly distributed on the cutter shaft in a double-spiral mode, the two spiral grass chopping units are arranged in a staggered mode, and the outer sides of the two blades of each grass chopping unit are each provided with a cutter holder connected with the cutter shaft. The lower portions of the two blades of each grass chopping unit are hinged to a round rod penetrating through the two tool aprons, and gaps exist between the two tool aprons and the blades or between the two blades. The grass chopping cutter head of the hedge trimmer can solve the problems that an existing grass chopping cutter head of the hedge trimmer is low in blade utilization rate and incomplete and incomplete in grass chopping.

Description

Technical Field

[0001] This utility model relates to the field of greening machinery manufacturing technology, and in particular to a blade for pruning grass in a highway greening trimmer. Background Technology

[0002] Highway greenbelts often require hedge trimmers to prune unevenly growing sections. Existing highway greenbelt trimmers typically use blades consisting of a cylindrical housing with an opening on one side. An axial cutter shaft is positioned in the center of the housing, with multiple rows of blades evenly distributed along the shaft. Each row contains multiple radially distributed blades, each with its upper part curved circumferentially along the shaft. Gaps exist between these multiple blade rows, easily missing grass and resulting in incomplete cuts. To reduce these gaps and cut the grass more completely, more blades are needed to increase the blade density, increasing manufacturing costs. Even with increased blades, the circumferentially curved blades can only cut grass in one direction, leaving grass requiring cutting in other directions uncut. This leads to low blade utilization, wasted blade resources, and difficulty in achieving complete and thorough grass cuts. Utility Model Content

[0003] The problem to be solved by this utility model is to provide a grass shredder head for hedge trimmers, so as to solve the problems of low blade utilization and incomplete grass cutting in existing grass shredder heads.

[0004] To solve the above problems, the technical solution of this utility model is as follows: The grass chopper head of this hedge trimmer includes a cylindrical shell with an opening on one side. A blade shaft is axially arranged in the middle of the shell. The blade shaft is provided with blades that are curved in the upper middle part. The upper middle part of the blades is curved along the axial direction of the blade shaft. Every two blades are symmetrically arranged and curved in opposite directions to form a grass chopping unit. The grass chopping units are evenly distributed on the blade shaft in a double helix. The two helical grass chopping units are staggered. Each blade of the grass chopping unit has a blade holder on its outer side that is connected to the blade shaft. The lower part of the two blades of each grass chopping unit is hinged to a round rod passing through the two blade holders. There is a gap between the two blade holders and the blades or between the two blades.

[0005] A more specific embodiment of the above technical solution could be: the portion of the round rod extending out from the two tool holders is fastened to the tool holder.

[0006] Furthermore: the round rod is a bolt with a nail head at one end, a smooth section between the two tool holders in the middle, and a threaded section extending beyond the tool holders at the other end. The threaded section of the bolt is provided with a nut for locking, and a cotter pin is installed on the part of the bolt outside the nut.

[0007] Furthermore, the cutter shaft is connected to a hydraulic motor via a reducer.

[0008] Furthermore, the cutter shaft is connected to a hydraulic motor via a belt drive.

[0009] Furthermore: the belt drive device includes a small pulley connected to the cutter shaft and a large pulley connected by a belt.

[0010] By adopting the above technical solution, this utility model has the following beneficial effects compared with the prior art:

[0011] This hedge trimmer's grass shredder features a staggered double-helix grass-shredding unit on the blade shaft, which solves the problem of missed grass cutting between blade rows. The two blades of the grass-shredding unit are hinged to a round rod between two blade holders, with their upper and middle parts bent symmetrically and facing away from each other along the blade shaft axis. This allows the two blades to swing freely up and down on the round rod between the blade holders without interfering with each other. When the blades encounter obstacles, they have a buffer zone, reducing the chance of blade damage. Furthermore, the cutting direction changes with the force applied during the swinging motion, enabling multi-directional grass cutting. This significantly improves blade utilization, solving the problems of single-direction cutting and incomplete grass cutting. The double-helix grass-shredding unit also reduces the number of blade rows along the axial direction to just two rows, drastically reducing the number of blades, lowering manufacturing costs, and minimizing resource waste. Attached Figure Description

[0012] Figure 1 This is a front view of Embodiment 1 of this utility model;

[0013] Figure 2 This is a right view of Embodiment 1 of this utility model;

[0014] Figure 3 This is a front view of Embodiment 2 of this utility model;

[0015] Figure 4 This is a right view of Embodiment 2 of this utility model;

[0016] The following components are marked in the diagram: housing 1, cutter shaft 2, blade 3, cutter holder 4, round rod 5, cotter pin 6, nut 7, roller 8, reducer 11, hydraulic motor 12, small pulley 21, large pulley 22, belt 23, tensioner 24, connecting plate 25, arc groove 26. Detailed Implementation

[0017] The embodiments of this utility model will be further described in detail below with reference to the accompanying drawings:

[0018] Example 1:

[0019] like Figure 1 , Figure 2The hedge trimmer blade shown includes a cylindrical housing 1 with an opening on one side. A blade shaft 2 is axially arranged in the middle of the housing 1. The blade shaft 2 has upper-middle curved blades 3. The upper-middle part of the blades 3 is curved along the blade shaft axial direction. Two blades 3 are symmetrically arranged and curved in opposite directions to form a grass trimming unit. The grass trimming units are evenly distributed on the blade shaft 2 in a double helix. The two helical grass trimming units are staggered. By staggering the grass trimming units arranged in a double helix on the blade shaft 2, the problem of missed grass cutting between the rows of blades can be solved.

[0020] Each of the two blades 3 of the grass-chopping unit has a blade holder 4 on its outer side, which is connected to the blade shaft 2. The lower part of the two blades 3 of each grass-chopping unit is hinged to a round rod 5 passing through the two blade holders 4. There is a gap between the two blade holders 4 and the blades 3, or between the two blades 3. The two blades 3 of the grass-chopping unit are hinged to the round rod 5 between the two blade holders, and the upper part of the two blades 3 is bent symmetrically and facing away from each other along the blade shaft axis, so that the two blades 3 can swing up and down freely on the round rod 5 between the blade holders 4 without interfering with each other. When the blades encounter obstacles, they can have a certain buffer zone, reducing the probability of blade damage. During the swinging process, the cutting direction changes with the force, which can cut grass in multiple directions. The utilization rate of the blades is greatly improved. This not only solves the problem of blades cutting grass in a single direction and incomplete grass cutting, but also allows the grass-chopping unit to be set up in a double helix, reducing the number of axial rows of blades to two rows of double helix, greatly reducing the number of blades, reducing manufacturing costs, and reducing resource waste.

[0021] The part of the round rod 5 extending out of the two blade holders 4 is fastened to the blade holders. Specifically, the round rod 5 is a bolt with a nail head at one end, a smooth section between the two blade holders in the middle, and a threaded section extending out of the blade holders at the other end. The threaded section of the bolt is equipped with a nut 7 for locking. A cotter pin 6 is installed on the part of the bolt outside the nut 7 to enhance the firmness. The bolt is a high-strength bolt that is threaded between the blades 3 of the blade holders 4, which increases the connection strength and makes the entire grass-chopping unit less likely to fall off when cutting grass and the blades 3 swing up and down.

[0022] The cutter shaft 2 is connected to the hydraulic motor 12 via a reducer 11. Driven by the hydraulic motor 12, the cutter shaft 2 can output greater torque, making it suitable for cutting thicker grass. The roller 8 below the cutter shaft 2 can adjust the distance between the blades and the ground, maintaining a predetermined height for the grass.

[0023] Example 2:

[0024] like Figure 3 , Figure 4The shown hedge trimmer blade has a blade shaft 2 connected to a hydraulic motor 12 via a belt drive. The belt drive includes a small pulley 21 connected to the blade shaft and a large pulley 22 connected via a belt 23. With the belt drive, the driving pulley is the large pulley 22 and the driven pulley is the small pulley 21. This type of blade can output higher speed and lower torque, making it suitable for cutting finer grass. A tensioning wheel 24 is provided between the belts 23 of the small pulley 21 and the large pulley 22. A long connecting plate 25 is hinged to the center line of the small pulley 21 and the large pulley 22 via a hinge shaft. The hinge shaft has a threaded section above the connecting plate 25 and a locking platform below the connecting plate. The tensioning wheel 24 is located on one end of the connecting plate, and a pin is located at the bottom of the other end of the connecting plate 25. The lower part of the pin is inserted into the arc groove 26 of the housing 1. When a tension angle is required, the connecting plate 25 is rotated and adjusted until the tensioning wheel 24 at one end of the connecting plate is in place. After adjusting the tension angle, the threaded section of the hinge shaft above the connecting plate is locked with a nut.

[0025] Other structures are as described in Example 1.

[0026] This hedge trimmer's grass shredder cuts grass more comprehensively and thoroughly, is more efficient, and uses fewer blades.

Claims

1. A hedge trimmer head, comprising a cylindrical housing with an opening on one side, an axial knife shaft arranged in the middle of the housing, and a curved knife blade arranged on the upper part of the knife shaft, characterized in that: The upper part of the blade is curved along the axis of the cutter shaft, two of the blades are symmetrically arranged and both are curved in opposite directions to form a grass cutting unit, the grass cutting units are evenly distributed on the cutter shaft in the form of double helixes, the two helixes of the grass cutting units are arranged in staggered positions, each of the two blades of the grass cutting unit is provided with a cutter seat connected with the cutter shaft, the lower part of the two blades of each of the grass cutting units is hingedly connected with a round rod penetrating through the two cutter seats, and gaps exist between the two cutter seats and the blades or between the two blades.

2. A hedge trimmer cutting head according to claim 1, characterised in that: The part of the round rod extending out of the two cutter seats is tightly connected with the cutter seats.

3. A hedge trimmer cutting head as claimed in claim 2, characterised in that: The round rod is a bolt with a nail head at one end, a smooth section between the two cutter seats, and a threaded section extending out of the cutter seats at the other end, the threaded section of the bolt is provided with a nut for locking, and the part of the bolt outside the nut is provided with a split pin.

4. A hedge trimmer cutting head according to any one of claims 1 to 3, characterised in that: The cutter shaft is connected with a hydraulic motor through a speed reducer.

5. A hedge trimmer cutting head according to any one of claims 1 to 3, characterised in that: The cutter shaft is connected with a hydraulic motor through a belt transmission device.

6. A hedge trimmer cutting head according to claim 5, wherein: The belt transmission device comprises a small pulley connected with the cutter shaft and a large pulley connected through a belt.

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