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작성자동짜몽 조회 28회 작성일 2020-11-23 19:21:32 댓글 0

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What is JACKSCREW and how it works - Translating Screw Jack and Rotating Screw Jack

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A Screw Jack also known as a Worm Screw Jack, is a device used to convert rotational motion into a “push-pull” linear motion. It utilises the property of a screw thread providing a mechanical advantage which means that it can be used to amplify force. The rotary movement can be supplied manually or thanks to the help of hydraulic or pneumatic motors. Or thanks to electric motors, like the induction motor!
In this video we will focus on the working principle of the worm screw jack.
We will see in detail the structure of its screw thread.
We will show the differences between the translating screw jack and the rotating screw jack.
And we will explain where the screw jack is used
A worm screw is the essential feature of a screw jack.
Here we can distinguish its main diameters, the thread elements, the pitch which is the distance between two threads, and the thread angle.
We can notice that this type of screw is a helical structure used to convert between rotational and linear movement or force. This is the pitch of the helix, while this is the tilt angle of the helix.
In this section we can clearly see the angle of the helix that determines the number of teeth of the screw, which are called “cogs”.
Having a wide helix angle, the worm screw has a small number of cogs.
It is called “worm” screw because its rotary motion has the sole purpose of being transmitted, like in every gear wheels.
The worm screw meshes with a worm gear. This two elements are also called the worm screw and worm wheel. This arrangements can reduce rotational speed or transmit higher torque. Let us remember that the torque is the tendency of a force to cause or change the rotational motion of a body about an axis.
Worm screw and gear arrangement has a high transmission ratio, which depends on the thread angle of the screw and the number of teeth of the worm gear.
The screw transmits the rotary motion to the worm gear. Usually this motion can only be transmitted from the screw to the worm gear and not the other way around. However, there are some arrangements where the screw and the worm gear have such a thread angle that allows the worm gear to drive the screw.
The mechanical efficiency represents the measure of the effectiveness with which the mechanical components perform without losing energy. The “irreversibility” of the gear arrangement is inversely proportional to the efficiency. In fact, when the effciency is less than 50%, and when the helix angle is equal to or less than the angle of friction, the mechanism will be irreversible and it can only be driven by the worm screw.
The worm gear mechanism usually has low efficiency, that’s because there are many contact areas. Plus the sliding motion creates friction between the gears. For this reason screw jacks have a high wear rate.
To overcome this issue, special combination of steel and bronze are used during the production process, so that only the bronze parts of the worm gear mechanism can be replaced.
There are 2 types of screw jacks: the translating screw jack and the rotating screw jack...

[후기이벤트 YouTube] ZW3D로 상판과 하판으로 구성된 스크류 잭 설계하기!

1.접하게 된 계기
컴퓨터응용가공분야에서 근무하고 있는 설계자로 CAD/CAM 프로그램을 정식으로 사용하고 싶어서 알아보던 중 팸플릿을 받아보고 리셀러 통해서 구입

2. 창작모델 설명
ZW3D로 상판과 하판으로 구성된 스크류 잭 설계하기!
(결합은 스크류 형식으로 이루어져 있고 하판을 평평한 곳이나 바닥에 놓고 상판을 시계방향(또는반대방향)으로 돌려서 높낮이를 조절하는 장치입니다.)

3. 사용후기
* 장점
- 설계부터 모델링, CAM데이터 출력까지 하나의 프로그램으로 할 수 있는 강점
- 그래픽이나 인터페이스가 깔끔하여 사용하기 용이
- 사용간에 애로사항 또는 오류 발생시 본사 기술지원팀의 신속한 서포트(인터넷 원격지원)

4. 기능 평가(속도, 호환성, 다중플롯 or 3DCAD기능 등)
- 제품 설계 시 쉽고 빠르게 설계 가능하며 공구를 만들어서 사용할 수 있는 편리성
- ZWCAD 뿐 아니라 타사 CAD 프로그램과 호환이 되고 PDF 파일로 도면으로 전환이 가능하여 편리
- 여러가지 메뉴들이 아이콘으로 표기되어 있어 어떤 기능인지 쉽게 이해가 가능하며 사용에 편리함

당신이 필요한 스크류잭

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블로그주소 http://blog.daum.net/hapsteel
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친구모우기 http://goto.kakao.com/hnz9pgol
철강단중표 다운받기
https://play.google.com/store/apps/details?id=appinventor.ai_hapsteel.qw

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