Application Practice New

Application 3 (V5)
A load angled at 45 degrees is counter weighted for ease of movement. One shock is requested to catch a door as it free falls to a stop. The load weighs 680 kg and the counter weight equals 227 kg. The counter weight is attached to the load by a cable over pulleys and is cycled no more than once an hour. They will mount the shock at the end of the incline. The closing impact velocity is calculated to be .15 m/sec.
Constant acceleration Actual Average
Distance to shock Average = Distance / Time Constant acceleration = 2 x average Actual = Depends on distance traveled
Applications
Version 7.0.0.3
Introduction
“Sizing” is the process of selecting the proper shocks for a specific application. Break down an application into the necessary components. Use these components in basic sizing equations or programs. Use the calculation results to select the appropriate shock.
P
Application 1 - Results
Model
MC 225MH SC 650M3 MA 600M MC 3325M3
E3 (%)
27 (65) 37 (50) 37 (54) 35 (21)
E4 (%)
1,590 (3) 2,209 (3) 2,209 (3) 2,098 (3)
We (Range)
Velocity
- Propelling Force Energy (E2)
s Fp
Work = force x distance. In the shock absorber industry work and energy can be treated as the same thing. E2 = Fp x s where Fp in Newtons is the propelling force and s in Meters is the stroke of the shock.
Leabharlann Baidu Sizing Equations
All shock absorber sizing can be covered with five basic equations.
To select the correct shock these equations must be known and understood.
- Effective Weight (We)
V Fp W
s
Effective weight determines performance performance! Effective weight (in kg) is the combined effect of weight, velocity, and propelling force on the shock absorber. We = (E1 + E2)/(0.5 x V2) = E3/(0.5 x V2)
- Energy per Cycle (E3)
V s Fp W
The total amount of energy absorbed each hit. E3 = E1 + E2 Each of our shocks have an E3 rating. If this rating is exceeded the shock can fail! E3 should be above 20% and below 80% of the rated shock value for optimum performance.
Application Components
Application components are the values for weight, velocity, force, and cycle rate used in the equations. The equations are relatively easy to use. Establishing these values, however, can often be difficult. This is where the battle is truly won!
- Kinetic Energy (E1)
V m (W)
Any mass in motion has Kinetic Energy. It’s components are: Mass (m in kg) and (V in m/sec). Classical Physics says: E = 1/2 x m x V2. For ACESIZE Kinetic Energy is called E1.
Direction of Motion
There are four basic types of motion.
Horizontal Vertical / Inclined
Rotary Horizontal Plane
Rt Rs
+
.
T s
Rotary Vertical Plane
Each determines how weight, velocity, and force will be calculated. The first step in sizing is to identify the applications type of motion.
E4 (%)
51 (0) 51 (0)
We (Range)
.15 (.03 - .61)* 4,514 (1,814 - 6,350)
* Effective weight is not considered in sizing a low velocity application where an ML series shock is sized. Velocity range (shown in m/sec) is used instead.
- Energy per Hour (E4)
V s Fp W
The rate at which energy is put into the shock. E4 = E3 x C where C is in cycles/hour. Each shock has an E4 rating. Exceed this value and the shock will burn out! E4 should be below 80% of the rated value for optimum performance.
Application 3
V W = 680 kg V = .15 m/s A = 450 Wcw = 227 kg C = 1 / hour N =1
W
Wcw A0
Application 3 - Results
Model
ML 3325M SC 650M9
E3 (%)
51 (30) 51 (24)
Application 1
W V B R P C S N B = = = = = = = = 86 kg 230 mm .75 seconds, allow for acceleration 50 mm 0 - because the cylinder is extending. 4.14 bar One/minute Auto select 1 V R W S
Application 2
W = 110 to 165 kg V = .76 m/sec F = W x µ (enter µ into the conveyor tab or 2 kw DC with µ into motor tab) C = 180/hour S = Auto select µ = .4 N = 1 V S W Mu
Application 1 (H3)
A shuttle is driven by a pneumatic cylinder. The loaded shuttle is pushed out by the extending cylinder and crashes. A shock is not needed when the empty shuttle returns. The cylinder has a 50 mm bore, 16 mm rod diameter, and a 260 mm stroke. The weight of the shuttle is estimated to be 86 kg. when loaded. The total movement of the shuttle is 230 mm and it is timed to take about 3/4 of a second. The production rate of this assembly line is 1 per minute for each assembly. The available line pressure is at 4.14 bar.
141 (23 - 227) 196 (68 - 408) 195 (9 - 1,361) 186 (104 - 417)
This is just a sample based on price. Results vary because of mathematical rounding.
Application 1 - Chart
Application 2 - Results
Model
MC 600MH MA 900M MA 3325M MC 3325M3
E3 (%)
64 (47) 43 (32) 74 (73) 49 (48) 63 (37) 42 (25) 63 ( 41) 42 (28)
E4 (%)
11,574 (17) 7,716 (11) 13,276 (15) 8,850 (10) 11,270 (15) 7,538 (10) 11,308 (15) 7,538 (10)
We (Range)
222 (104 - 1,134) 148 (104 - 1,134) 254 (14 - 2,041) 170 (14 - 2,041) 214 (9 - 1,724) 144 (9 - 1,724) 217 (104 - 417) 144 (104 - 417)
Bold = max. case Normal = min.
Application 2 (H5)
A conveyor moves castings down the line at .76 m/sec. The conveyor is driven by a 2 kw DC motor. The conveyor has a coefficient of friction equal to .4. This line produces two different castings that weigh a) 110 kg and b) 165 kg. The production rate is 180 castings per hour.