The hedge trimmer is a garden machinery used for trimming green hedges, and its design concept mainly includes the following aspects:

1. Applicability: The design of hedge trimmer should take into account the trimming needs of various hedgerows, including height, width, shape, as well as the usage requirements under different terrain and climate conditions.

2. Power system: Green hedgerows usually use electric power as the power source, which requires sufficient power output and stability, while also considering noise and emission issues.

3. Trimming tool: The trimming tool of the hedge trimmer is its component and needs to be designed with a durable, sharp, easy to replace and maintain structure. Meanwhile, the arrangement and angle of the cutting tools can also affect the trimming effect and work efficiency.

4. Body structure: The body structure of the hedge trimmer needs to be designed as lightweight, stable, easy to operate and maintain, while also considering ergonomics and safety.

5. Control system: The control system of the hedge trimmer needs to be designed with a simple, intuitive, and easy to operate structure, while also considering energy conservation and environmental protection issues.

Overall, the design concept of hedge trimmer is to comprehensively consider various factors to provide efficient, stable, safe, and environmentally friendly pruning services.