Bleachers (also called grandstands / tiered spectator seating) are classified by mobility & installation mode, driving system (for retractable types), seat design, and application scene, combined with the Yunxinda product materials above.

1. By Mobility & Installation (Core Main Classification)

1.1 Fixed / Permanent Bleachers

- Permanently anchored to ground/floor, non-movable, made of reinforced steel, aluminum or concrete.

- Two sub-types:

  - Outdoor large stadium grandstands: For football, baseball fields, often with roofs and under-stadium storage/rooms.

  - Indoor fixed stadium seats: Wall-mounted or floor-fixed tiered seats for arenas.

- Pros: Ultra-stable, huge seating capacity, long service life; Cons: Zero flexibility, occupies permanent floor space.

1.2 Telescopic / Retractable Bleachers (the core product of Hebei Yunxinda)

Modular nested rolling structure, extend outward for audience viewing, retract compactly against walls to free full venue floor. Mainly used for indoor multi-purpose gyms, school halls, auditoriums.

Split by power drive (see Section 2 below).

1.3 Portable / Demountable Bleachers

Lightweight aluminum modular frames, fully disassembled and relocated between venues.

- Tip-and-Roll portable bleachers: Small wheeled units, rolled around the same venue.

- Trailer-mounted bleachers: Installed on trailers, towable to outdoor temporary events (sports meets, concerts).

- Scaffold temporary bleachers: Built on-site with scaffold frames for short-term rental events, dismantled after use.

2. Sub-types of Telescopic (Retractable) Bleachers (by driving power)

2.1 Electric Retractable Bleachers (Yunxinda’s flagship product)

Driven by built-in motors, controlled via button panel/remote, auto extend/retract with anti-pinch safety sensors. Ideal for large, frequently used gymnasiums and multi-functional halls; fast, labor-free operation.

2.2 Manual Telescopic Bleachers

Pull/push by hand or hand crank with rolling wheels. Low cost, simple structure, fit small community gyms with low usage frequency.

2.3 Hydraulic / Pneumatic Telescopic Bleachers

Hydraulic: Ultra-smooth, quiet, heavy-load capacity for large grandstands.

Air-powered: Compressed air driven, no complex wiring, suitable for venues without stable power supply.

3. By Seat Configuration

3.1 Bench Bleachers (Backless bleachers)

Continuous flat plank benches without separate chairs; low cost, common for outdoor sports fields, temporary events.

3.2 Individual Bucket Seat Bleachers (Stadium seating)

Independent molded plastic seats with backrests (UV-resistant HDPE as Yunxinda supplies). Higher comfort, OEM customizable colors, widely used in formal gyms, arenas and indoor telescopic stands.

3.3 Folding Flap Seat Bleachers

Seat panels flip upward when bleachers retract, further saving storage space; standard matching for electric telescopic grandstands.

4. By Usage Environment

1. Indoor bleachers: Telescopic retractable stands, fixed auditorium seats, lightweight portable aluminum bleachers for gyms/halls.

2. Outdoor bleachers: Weather-proof galvanized steel/aluminum frames, UV anti-aging plastic seats, permanent stadium grandstands, mobile temporary tribunes for outdoor pitches.