01_Worm_gear_screw_jacks(1).pdf
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Worm gear screw jacks
Contents
3
Worm gear screw jacks
29-116
3.1
Construction support
30-32
3.1.1
Specifications/Solution system
30
3.1.2
Construction
30-32
3.2
Configuration type 1 - Configuration type 2
33
3
3.3
Structural configurations
34-41
3.3.1
SHE range type 1
34-35
3.3.2
MERKUR range type 1
34-35
3.3.3
SHE range type 2
36-37
3.3.4
MERKUR range type 2
36-37
3.3.5
HSE range type 1
38-39
3.3.6
HSE range type 2
38-39
3.3.7
SHG range type 1
40-41
3.3.8
SHG range type 2
40-41
29
Phone + 49 / 8 21 / 78 01-320 · www.pfaff-silberblau.de · antriebstechnik@pfaff-silberblau.de
Worm gear screw jacks
3.1 Construction support
The wide range of possible applications for our drive systems reveal their
great versatility – which is increased even further through our customized
solutions. Whatever operating task needs performing, whatever function you
require – we can supply the right standard, modified or special solution,
successfully combining off-the-peg elements with totally task-specific
answers to your specifications. Just contact your technical specialist and
draw up a draft solution for your particular task at hand.
3
3.1.1 Specifications/Solution system
In order to help you finding the correct specification we are indicating below
both the task specification and the corresponding solution.
Your task specification
• Screw jack requirements
• Special configuration factors and features
Our solution
• Suggested solutions
and recommendations
3.1.2 Construction
Your task specification
Symbol
Our solution
➊
➋
➊
2
nd
guide ring
increases stability and prevents non-permitted
edge compression on the nut thread
➋
Articulated head
joint screw mounting
• No on site guidance possible
• Lateral forces cannot be ruled out
• Restoring forces produced by swivelling
motion
Movable travelling nut mounting
Use trunnion or spherical nut support
Note:
Lateral forces should be avoided, as they
drastically reduce the service life of the
supporting nut
• Worm gear screw jack as single drive unit
without on site guidance
• No on site anti-turn device available
• With/Without lift limitation
Anti-turn device
Standard system using square tube or special
configuration with feather key (for low lifting
forces)
• Mechanical run-out prevention system
required
• With/Without lift limitation
Mechanical lift limitation,
configuration type 1
Screw end with mechanical end stop for
emergency limiting.
Protection tube with fitted limit switches
• Swivelling/Tipping movements provided
by worm gear screw jacks
• With/Without lift limitation
Swivel-lug configuration
Secure drive elements at two points using
moveable mountings. This can be done using
head IV on both screw ends or articulated
head. The bending moments resulting from
the swivelling motion should be minimized as
much as possible by means of low-friction
joints.
30
Phone + 49 / 8 21 / 78 01-320 · www.pfaff-silberblau.de · antriebstechnik@pfaff-silberblau.de
Worm gear screw jacks
3.1 Construction support
Your task specification
Symbol
Our solution
Configuration with adjustable play
Special configuration with pre-stressed
double nuts, axial play can be readjusted via
housing cover.
Special configuration with pre-stressed double
travelling nuts. Axial play can be readjusted.
Note: Only applies to load reversal
(tensile and compression load).
No readjustment is required if ball screws
are used.
• Requirement for constant axial
play in trapezoidal screw thread
3
Short safety nut
• Supporting nut with short safety nut
• Visual wear monitoring
Note: Monitoring is only possible in one
load direction.
• Requirement for increased operating
safety
• Limitation of material damage in event of
nut breaking
Long safety nut
In the case of worm gear screw jacks used
on theatre stages BGV C1 (VBG 70), lifting
platforms (VBG 14) or lifting systems that
might affect personal safety, screw jacks are
designed according to current regulations,
and include such items as anti-drop systems
(self-locking screws and/or mechanical safety
brakes as part of the drive system). The
function of the synchronizing device is
guaranteed, if required, by additional
components.
• Requirement for personal safety measures
and/or conformity to VBG 14
accident prevention standards (persons
under raised load/working platforms)
• Or configuration conforming to
BGV C1 (VBG 70) standards for stages
and broadcasting studios
Telescopic configuration
Right-/left-handed screw system requires –
with large stroke – only half the length of
protection tube (stroke x 0,5 +
approx. 30 mm)
• Large lifting capacity with small
installation space
Reinforced screw
for configuration type 2, possible under
certain circumstances for configuration type 1
• Large lifting lengths and unfavourable
clamping with minimal lifting force
Single-start trapezoidal screw Tr
with self-locking system (e. g.: Tr 40x7)
• No accidental lowering of load while
unit is shutdown
Buttress-thread screw S
• High lifting capacity for same screw
diameter
Multi-start trapezoidal screw Tr
•
Efficiency rating (Tr > 50 %)
(e. g.: 2-start screw Tr 40x14 P7)
• No self-locking system –> motor brake
always required
• High lifting speed required
• Economical alternative to ball screw
P=xx
Single-start trapezoidal screw with
special lead
* No additional motor brake required
(e. g.: Tr 40x5)
• Self-locking out of actuation
• No motor brake desired
P=?
Ball screw Ku
or Pl planetary roller screw
•
Efficiency rating
Ku
≈
90 %
Pl
≈
65 %
• No self-locking system –>
motor brake always required
• High lifting speed required
• Minimal axial play (
≤
0,03 mm)
• High lead accuracy P300
≤
0,05 mm
• Minimal friction required
31
Phone + 49 / 8 21 / 78 01-320 · www.pfaff-silberblau.de · antriebstechnik@pfaff-silberblau.de
Worm gear screw jacks
3.1 Construction support
Your task specification
Symbol
Our solution
• Positioning
• Position measurement
Shaft encoder installation
Available as option for all common makes
Fitted directly to worm gear screw jack
• Angle incremental encoder
SSI absolute-value transmitter or DP Profibus
3
Hollow shaft
Motor installation via hollow shaft and IEC
flange
• Available installation space is limited
Motor mounting flanges
• Motor should be directly attached to
screw jack
Swivel mounting bases
complete with bearing seats
• Components are required to perform
swivelling movements
Swivel plates
• Active protection against dust, dirt or
moisture required
Screw protection
Flexible protection boots
Spiral spring cover
I
II
III
IV
• Variable structural attachment methods
desired
Spindle heads
Head I
= plain head
Head II
= flange plate
Head III
= threaded head
Head IV
= rod-type head
Head GK
= fork-type head
Option
= articulated head
GK
Option
• Manual operation and/or manual
emergency actuation required
Hand wheel
Only advisable for emergency use or for
small lifting movements.
Conforming to DIN 950, compatible with
the corresponding worm gear screw jack,
supplied ready-drilled and keyed
32
Phone + 49 / 8 21 / 78 01-320 · www.pfaff-silberblau.de · antriebstechnik@pfaff-silberblau.de
Worm gear screw jacks
3.2 Configuration type 1 - Configuration type 2
Type 1:
Axial lifting screw; nut thread integrated into
worm gear
Type 1:
Axial lifting screw; nut thread integrated into
bevel gear
Ro
3
Ru
Worm gear screw jacks SHE/HSE/MERKUR
Quick-lifting screw jack SHG
Drive is effected by the worm shaft acting on the
worm wheel with nut thread. Lifting movement is
effected by an anti-turn device (supplied with unit or
added on site).
Drive is provided by the driving pinion acting on the bevel
gear with nut thread. Lifting movement is effected by an
anti-turn device (supplied with unit or added on site). The
alignment of the bevel gear (Ro or Ru) determines the
direction of rotation.
(Ro = top wheel / Ru = bottom wheel)
Type 2:
Rotating screw; nut thread in travelling nut
outside the housing
Type 2:
Rotating screw; nut thread in travelling nut
outside the housing
Worm gear screw jacks SHE/HSE/MERKUR
Quick-lifting screw jack SHG
Drive is effected by the worm shaft acting on the
worm wheel. Rotating movement is effected by the
positive engagement of the screw in the worm wheel.
Lifting movement is effected by the travelling nut
anti-turn device fitted on site.
Drive is effected by the driving pinion acting on the
bevel gear. Rotating movement is effected by the
positive engagement of the screw in the bevel gear.
Lifting movement is effected by the travelling nut
anti-turn device fitted on site. The alignment of the
bevel gear (Ro = wheel upside / Ru = wheel downside)
determines the direction of rotation (see type 1).
Note:
standard configuration = right-handed screw; axial movement (direction) turning direction of drive shaft
33
Phone + 49 / 8 21 / 78 01-320 · www.pfaff-silberblau.de · antriebstechnik@pfaff-silberblau.de
Plik z chomika:
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Inne pliki z tego folderu:
Pfaff_zurawie_slupowe_pl.pdf
(954 KB)
01_Worm_gear_screw_jacks(1).pdf
(3605 KB)
02_Worm_gear_screw_jacks_SHE_MERKUR(1).pdf
(2300 KB)
03_Worm_gear_screw_jacks_HSE(1).pdf
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05_Bevel_gear_boxes(1).pdf
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