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JWM series trapezoid spiral screw jacks

JWM series trapezoid spiral screw jacks

JWM series trapezoid spiral screw jacks
JWM type (trapezoidal screw type)
Low speed, low frequency, main components: precision trapezoid screw pair and high precision worm-gear pair.
Economical: Compact structure, simple operation and convenient maintenance.
JWM (trapezoid-type) is applicable to the occasion with the high load, low speed and frequent work.
Load maintenance, trapezoidal screw has self-lock function, it can hold up load without braking device when screw stops traveling.
When the obvious vibration happens and the load is impacted, the automatic interlocking is out of order sometimes, and at that time it must be equipped with the braking outside.

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  • Considering the condition of application, and then choose suitable products.

    If you need us to choose more suitable product for you, please provide us the parameter as follows:

    1.     Weight of Jacks: how much Kg?

    2.     Speed of Jacks: the moving length of the screw or screw nut per minute or per second.

    3.     Screw movement form: screw move or screw nut move.

    4.     One or several device for jacks.

    5.     Whether directly connect with drive motor?


    Important calculation: calculation for the root diameter of screw.


  • Modify the standard spiral screw jack
           Suitable modify parts including non-standard coating(passivation treatment: galvanize, chroming, equip with 2-nipple or 3-nipple thread screw and stainless steel screw or worm shaft , improve the length of screw shaft and worm shaft, and furnish with reverse thread screw and so on 
    Adding and changing accessories for standard spiral screw jacks.
           It can add accessories, such as: safety lock nut, anti-reverse device, special screw nut, coding adapter flange, non-standard motor flange and so on.
    Completely special screw jacks
           We can’t change the existing screw jacks, but we can design and manufacture according to your special need.
  • 1. Several spiral screw jacks can be linked to be a lifting system. It can start with several screw jacks in the same time. There are some patterns for this kind of lifting system, they are need to be equipped with bevel gearbox, motor, reducer, drive shaft, coupling and movement control device. All accessories can refer to the system parts.

    2. H type and U type lifting structure is two commonly used system structures. 

    3. Please note, several screw jacks can be mechanical linked and electric linked.

    Electric linked is used for the condition with no spare space to connect drive shaft, if connect several screw jacks to be a lifting system, you need to consider the self-locking of the whole system. Relative questions can consult Beijing Saili Transmission Co., Ltd, or add a brake device for the system, this device is independent and also can be a brake motor.
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