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CN-224218916-U - Grass trimmer

CN224218916UCN 224218916 UCN224218916 UCN 224218916UCN-224218916-U

Abstract

The utility model provides a grass cutting machine, includes the working head, the working head includes shell 11, holds to motor in the shell, the motor includes axial extension the pivot 13 of shell, be connected to rotor shell 14 of pivot, the lateral wall of shell is equipped with the air intake 101 that supplies cooling air current to get into its inside, the shell the rotor shell set up in the shell, the height between rotor shell's top and the bottom is H1, the minimum distance between rotor shell's top and the inboard roof of shell is L, the work includes the line ball 15 that is located between air intake and the rotor shell the top of line ball with the height of rotor shell bottom is H2, H1, H2, L satisfy that 0.75H1 is less than or equal to H2 is less than or equal to H1, L is less than or equal to H1-H2. The grass trimmer reduces the resistance of cooling air flow, improves the overload capacity of the working head and prolongs the service life.

Inventors

  • LIU TIANLIANG
  • Yi Mohan

Assignees

  • 江苏东成园林机械有限公司

Dates

Publication Date
20260512
Application Date
20250430

Claims (10)

  1. 1. The utility model provides a grass cutting machine, its characterized in that includes the working head, the working head includes the shell, holds to motor in the shell, the motor includes the axial to extend the pivot of shell, be connected to the rotor shell of pivot, the lateral wall of shell is equipped with the air intake that supplies cooling air current to get into its inside, the rotor shell set up in the shell, the height between the top and the bottom of rotor shell is H1, the minimum distance between the top of rotor shell and the inboard roof of shell is L, the working head includes the line ball board that is located between the air intake with the rotor shell, the height between the top of line ball board with the bottom of rotor shell is H2, H1, H2, L satisfy 0.75H1H 2 and be less than or equal to H1, L be greater than or equal to H1-H2.
  2. 2. A lawnmower as claimed in claim 1, comprising at least one of: The top of the rotor shell is provided with a plurality of ventilation holes for the cooling air flow to pass through, the ventilation holes are waist-shaped holes, the ventilation holes are mutually distributed at intervals around the rotating shaft, and the ventilation holes are bent around the rotating shaft; the radius of the rotor shell relative to the rotating shaft is R1, and the total area S of a plurality of ventilation holes meets the conditions that S is more than or equal to 0.3 pi R1 2 ; the distance between two adjacent ventilation holes is T, and T is more than or equal to 5mm.
  3. 3. A lawnmower as claimed in claim 2, comprising at least one of: The middle part of the shell is provided with a fixed column, the rotating shaft penetrates through the fixed column, the motor further comprises a rotor and a stator, the rotor is fixed on the inner wall of the rotor shell, and the stator is arranged opposite to the rotor and is fixed on the fixed column; The inner diameter of the stator relative to the rotating shaft is R2, the radius of the innermost circle of each vent hole relative to the rotating shaft is R5, and R2 and R5 meet the condition that R5 is less than or equal to R2; The outer diameter of the stator relative to the rotating shaft is R4, the radius of the circle of each vent hole relative to the outermost side of the rotating shaft is R3, and R2, R4 and R3 meet the requirement of 0.5 (R2+R4) R3 is less than or equal to R4.
  4. 4. A lawnmower as claimed in any one of claims 1 to 3, wherein the working head further comprises a wind scooper, the wind scooper being fixed to the bottom of the housing, the wind scooper being disposed around the rotation axis, the wind scooper having an inner diameter that gradually decreases in a direction away from the housing.
  5. 5. The grass cutting machine of claim 4, wherein the working head further comprises a rotating sleeve and a locking pin quick-release mechanism, the rotating sleeve is fixed on the rotating shaft, a positioning opening is formed in the rotating sleeve, the locking pin quick-release mechanism is fixed at the bottom of the shell, and the locking pin quick-release mechanism is matched with the positioning opening to lock or unlock the rotating shaft, and/or, The wind scooper is provided with a notch for avoiding the lock pin quick-release mechanism, and the width W of the notch is less than or equal to 15mm.
  6. 6. The grass cutting machine according to claim 4, wherein a fixing seat is arranged in the middle of the shell, a bearing is arranged on the fixing seat, the rotating shaft is connected with the bearing, the bottom of the fixing seat is positioned in the wind scooper, the outer diameter of the bottom of the fixing seat is R6, the minimum inner diameter of the wind scooper is R7, R6 and R7 meet that R7 is less than or equal to R6, and/or, The distance between the bottom end face of the fixed seat and the bottom end face of the air guide cover is m, and m is more than or equal to 3mm and less than or equal to 5mm.
  7. 7. The grass trimmer of claim 6 wherein said working head further comprises a cooling fan disposed at the bottom of said housing and connected to said shaft, said cooling fan comprising a plurality of blades, each of said blades comprising a projection projecting toward said air guiding hood, the highest of said projections having a radius R8 relative to said shaft, said R7, R8 satisfying R8≤R7.
  8. 8. The grass trimmer of claim 1, further comprising a connecting rod and a handle assembly, wherein one end of the connecting rod is connected to the working head, the other end of the connecting rod is connected to the handle assembly, a hollow channel is arranged in the connecting rod and is communicated with the air inlet, and a plurality of through holes communicated with the hollow channel are formed in the connecting rod.
  9. 9. A grass trimmer as defined in claim 8 wherein said connecting rod is circular in cross-section, said connecting rod has a radius R9, and/or, The total air inlet area of the air inlets is more than or equal to 2 pi R9 2 .
  10. 10. A grass trimmer according to claim 9 wherein the handle assembly includes a handle housing having a receiving cavity therein, the connecting rod is connected to the handle housing, the hollow passage communicates with the receiving cavity, and a control circuit board mounted in the handle housing, the control circuit board being disposed in correspondence with an opening of the hollow passage and having a thickness direction parallel to an axial direction of the hollow passage, and/or, Two air inlet windows are arranged on two sides of the handle shell, and the total air inlet area of the two air inlet windows is more than or equal to 2 pi R9 2 .

Description

Grass trimmer Technical Field The utility model belongs to the technical field of grass mowing equipment, and particularly relates to a grass mowing machine. Background In the grass cutting machine on the market, a driving motor is generally arranged in a shell of a working head in front of the grass cutting machine, and a PCBA control board is arranged on a holding part. When the grass trimmer works outdoors, the grass trimming rope is sometimes required to continuously cut grass scraps to fly dust and grass scraps near the working head in the high-temperature environment above 35 ℃, so that higher requirements are placed on heat dissipation and dust prevention of the core power component-the motor. For some barren scenes, the motor is required to have higher continuous overload capacity, and the motor can not frequently trigger temperature protection because of higher temperature, so that the operation efficiency of a user is influenced, and the operation experience is reduced. The driving motor used by the working head is provided with a direct current brush motor (such as Greenworks double-24V front mower ST48B 2210) which is provided with a first-stage reduction gear reduction mechanism, the whole structure is complex, the heat dissipation wind path of the motor is complex, the brush motor has smaller power and is not suitable for the working conditions of a large load and a high power motor, and the direct current brushless BLDC motor (such as Worx WG185E double-20V front mower) is also provided with the direct current brushless BLDC motor. Disclosure of utility model In view of the above, the utility model provides a grass trimmer, which reduces the resistance of cooling air flow, improves the overload capacity of a working head and prolongs the service life. The utility model provides a grass cutting machine, includes the working head, the working head includes the shell, holds to motor in the shell, the motor includes the axial to extend the pivot of shell, be connected to the rotor shell of pivot, the lateral wall of shell is equipped with the air intake that supplies cooling air current to get into its inside, the rotor shell set up in the shell, the height between the top and the bottom of rotor shell is H1, the minimum distance between the top of rotor shell and the inboard roof of shell is L, the working head includes the line ball board that is located between the air intake with the rotor shell, the height between the top of line ball board with the bottom of rotor shell is H2, H1, H2, L satisfy 0.75H1≤H2≤H2, L≥H2. In the embodiment of the utility model, a plurality of ventilation holes for the cooling air flow to pass through are formed in the top of the rotor shell, the ventilation holes are waist-shaped holes, the ventilation holes are mutually distributed at intervals around the rotating shaft, the ventilation holes are arranged in a bending mode around the rotating shaft, the radius of the rotor shell relative to the rotating shaft is R1, the total area S of the ventilation holes meets the conditions that S is more than or equal to 0.3 pi R1 2, the distance between two adjacent ventilation holes is T, and the T is more than or equal to 5mm. In the embodiment of the utility model, a fixed column is arranged in the middle of the shell, the rotating shaft passes through the fixed column, the motor further comprises a rotor and a stator, the rotor is fixed on the inner wall of the rotor shell, the stator and the rotor are oppositely arranged and fixed on the fixed column, the inner diameter of the stator relative to the rotating shaft is R2, the radius of the innermost side of each vent hole relative to the rotating shaft is R5, R2 and R5 are satisfied that R5 is less than or equal to R2, the outer diameter of the stator relative to the rotating shaft is R4, the radius of the outermost side of each vent hole relative to the rotating shaft is R3, and R2, R4 and R3 are satisfied that R3 is less than or equal to 0.5 (R2+R4). In an embodiment of the present utility model, the working head further includes a wind scooper, where the wind scooper is fixed to a bottom of the housing, the wind scooper is disposed around the rotating shaft, and an inner diameter of the wind scooper gradually decreases toward a direction away from the housing. In the embodiment of the utility model, the working head further comprises a turning sleeve and a locking pin quick-release mechanism, wherein the turning sleeve is fixed on the rotating shaft, a positioning opening is formed in the turning sleeve, the locking pin quick-release mechanism is fixed at the bottom of the shell, the locking pin quick-release mechanism is matched with the positioning opening to lock or unlock the rotating shaft, and/or a notch avoiding the locking pin quick-release mechanism is formed in the air guide cover, and the width W of the notch is less than or equal to 15mm. In the embodiment of the utility model, a fixed seat is arranged in