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More InformationIn this video, viewers will learn about the duty cycle of a screw jack, including how operating and idle times affect performance and the factors that influence its efficiency.
Caption timestamps (60)
Captions in English; video spoken in German.
| Timestamp | Caption |
|---|---|
| 0:00 | What is the duty cycle of a |
| 0:02 | screw jack? |
| 0:03 | The duty cycle describes the |
| 0:05 | ratio of operating time |
| 0:07 | to idle time and is always |
| 0:08 | specified as a percentage. |
| 0:12 | Let me describe an example. | If we say that we operate a |
| 0:14 | gearbox at 20 percent, |
| 0:16 | that means, | out of one hour, |
| 0:18 | the gearbox runs for twelve minutes |
| 0:20 | and remains idle for 48 minutes |
| 0:23 | of that time or |
| 0:24 | in the resting phase. |
| 0:25 | Can you briefly explain the |
| 0:27 | influencing factors? |
| 0:29 | The influencing factors are, |
| 0:31 | firstly, high loads on the gearbox. |
| 0:33 | High loads mean |
| 0:34 | high friction. |
| 0:36 | High friction is associated |
| 0:37 | with high heat generation and this |
| 0:39 | affects the duty cycle. |
| 0:41 | High speeds, |
| 0:42 | the situation is very similar. |
| 0:44 | The higher the input speed |
| 0:45 | into the gearbox, the |
| 0:47 | higher the friction and the |
| 0:49 | warmer the entire system becomes. |
| 0:51 | The choice of screw type, namely |
| 0:53 | ball screw or |
| 0:54 | trapezoidal screw. |
| 0:56 | The trapezoidal screw has |
| 0:57 | higher friction and therefore |
| 0:59 | higher heat generation. |
| 1:01 | This means that for systems with a higher |
| 1:03 | duty cycle, I would always |
| 1:04 | recommend a ball screw or |
| 1:07 | it is also | used this way in practice. |
| 1:09 | The environment is also very important |
| 1:10 | or the cooling |
| 1:11 | of the entire system. |
| 1:13 | What does this mean |
| 1:14 | for sizing? |
| 1:15 | The duty cycle is one of the |
| 1:16 | most important parameters |
| 1:17 | for sizing. |
| 1:19 | This means that I receive |
| 1:20 | various specifications from the customer |
| 1:22 | regarding how they want |
| 1:23 | to operate their system, namely stroke, |
| 1:25 | load and duty cycle. |
| 1:27 | Accordingly, I have to select the |
| 1:29 | gearbox size, the |
| 1:30 | screw type, the lead of the |
| 1:32 | screw and therefore design a |
| 1:34 | cost-effective system for the |
| 1:35 | customer. |
| 1:37 | A system that can be delivered |
| 1:38 | quickly and that offers the |
| 1:40 | perfect solution for them. |
The duty cycle describes the ratio of operating time to idle time and is specified as a percentage. At a duty cycle of 20%, a screw jack operates for 12 minutes within one hour and remains idle for 48 minutes.
Which factors influence the duty cycle?
The influencing factors are:
- high loads on the screw jack
- high speeds
- the choice of screw type
High loads mean high friction. High friction is associated with high heat generation and influences the duty cycle. High speeds have a similar effect. The higher the screw jack speed, the higher the friction and heat generation.
What role does the screw type play?
The choice of screw type also influences the duty cycle. This includes the selection between:
- ball screw
- trapezoidal screw
