Chapter 2: Brief introduction of QRY20
RT20 rough terrain crane is a kind of telescopic boom and swing type crane which travels with tire type chassis. It is composed of the superstructure and undercarriage. The superstructure is the lifting part, composed of the telescopic boom, jib, main winch, aux. winch, luffing mechanism, counterweight, swivel table, etc. The undercarriage is composed of the suspension and walking part. The superstructure and the undercarriage are connected by the slewing bearing.
Chapter 3: Main features of QRY20
1. Front-wheel steering, rear wheel steering, four wheel steering and crab steering, all wheel drive, off-road
performance, suitable for off-highway travel.
2. The axle adopts Meritor axle
3. The gearbox adopts the Advance brand.
4. Service brake adopts Double circuits air braking system; Parking brake adopts air bleed bellow braking system.
5. Fully extended outriggers operation, with semi-stretch outriggers operation, without outriggers operation and traveling with load operation can be realized.
6. Suitable for narrow space travel and operations; small turning radius; strong maneuverability.
7. Safe and reliable control system, two seats or one seat can be optional, all-directional lifting operation,
greatly enhanced the ability of the front lifting.
8. The crane has good traffic-ability, dynamic performance and mobility, and is able to operate in every direction and travel while hoisting without outriggers. The product is widely used in heavy lifting operations, short distance transfer, narrow-site lifting operations for construction sites, outdoor oilfields, warehouses, freight yards, logistics basses and other sites.
Chapter 4: Safety device of QRY20
Safety device includes torque limiter, swing table lock device, winch over-winding and over-relaxation protect device, outrigger lock device, outrigger bidirectional hydraulic lock, rear axle steering lock and rear wheel return detector, emergency steering power device, gradienter, hydraulic system overflow valve, balance valve.
1) Torque limiter
Detecting function: Detect the angle of the boom automatically.
Display function: Show operating information such as actual load, handling radius, boom angle.
Caution function: When the actual load exceeds rated lifting load, torque limiter will give an alarm and stop the operation.
2) Swing table lock device
During the driving process, a plug device is used to connect the swing table and the carrier to keep the steering parts (swing table, boom) from swing caused by inertia.
3) Winch over-winding protect device
When the load reaches a certain height,torque limiter will stop the falling and indicating light on the instrument panel will be on.
4) Winch over-relaxation protect device
When only 3 laps of rope is left on the winch, torque limiter will stop the falling and indicating light on the
instrumentation board will be on.
5) Outrigger lock device
During the driving process, a plug device is used. By plugging the outrigger, the device deeps it from extending.
6) Outrigger bidirectional hydraulic lock
Outrigger bidirectional hydraulic lock is used to insure the horizontal and vertical cylinder will not
automatically retract when outriggers are in the extending state .
7) Rear axle steering lock and rear wheel return detector
During the driving process, only front axle steering is needed and the rear should be returned aligned. For this reason a lock device is used and indicating light on the instrumentation board shows the status.
8) Emergency steering power device (emergency pump)
If there is an emergency that the engine can not be started, the crane can be dragged by other vehicles. The emergency pump is driven by battery and supplies power to power cylinder.
Chapter 5: Technology parameter of QRY20
Table 5-1 QRY20 Main technical parameters table in travel state
| Category |
Items |
Units |
Parameters |
Outline Dimension
Parameters |
Overall length |
mm |
12000 |
| Overall width |
mm |
2750 |
| Overall height |
mm |
3650 |
| Axle base |
mm |
3600 |
| Tread |
mm |
2250 |
| Weight Parameters |
Dead weight in travel state |
Kg |
24000 |
| Axle load |
Front axle |
Kg |
12650 |
| Rear axle |
Kg |
11350 |
| Power Parameters |
Engine rated output |
Kw/(r/min) |
140/2200 |
| Engine rated torque |
N.m(r/min) |
760/1400~1600 |
| Travel Parameters |
Travel speed |
Max. travel speed |
Km/h |
40 |
| Min. stable travel speed |
Km/h |
9.65 |
| Turning radius |
Min. turning radius |
m |
3.23 |
| Min. turning radius of boom head |
m |
315 |
| Min. ground clearance |
mm |
18 |
| Approach angle |
° |
18 |
| Departure angle |
° |
≤8.5 |
| Braking distance (at 30km/h) |
m |
50 |
| Max. grade ability |
% |
84 |
| Max. outside noise during accelerating |
dB(A) |
12650 |
Table 5-2 QRY20 Main Technical Parameters Table in Lifting State
| Category |
Items |
Unit |
Parameters |
| Main Performance Parameters |
Max. total rated lifting load |
t |
20 |
| Min. rated working radius |
m |
3 |
| Max. load moment |
Base boom |
KN.m |
697 |
| Fully-extended boom |
KN.m |
552 |
| Outrigger span |
Longitudinal |
m |
5.83 |
| Lateral |
m |
5.6 |
| Lifting height |
Base boom |
m |
10 |
| Fully-extended boom |
m |
30.7 |
| Boom length |
Base boom |
m |
9.9 |
| Fully-extended boom |
m |
31.2 |
| Working Speed Parameters |
Luffing time |
Boom raising time |
s |
55 |
| Boom descending time |
s |
36 |
| Boom telescoping time |
Boom fully-extended time |
s |
80 |
| Boom fully retracting time |
s |
48 |
| Max. swing/slewing speed |
r/min |
2.0 |
| Outriggers telescoping time |
Horizontal outriggers |
Extending synchronously |
s |
16 |
| Retracting synchronously |
s |
11 |
| Vertical outriggers |
Extending synchronously |
s |
30 |
| Retracting synchronously |
s |
30 |
| Hoisting speed (wire rope is at the 4th layer) |
Main winch |
Full load |
m/min |
140 |
| No load |
m/min |
110 |
| Auxiliary winch |
Full load |
m/min |
140 |
| No load |
m/min |
90 |
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