Product Description
Mandrel Connecting
Machine is one of important dedicated equipment in seamless pipe
mill. Its purpose is to carry
out assembling or disassembling of a complete mandrel composed of
working length, extension length and tail piece by screwing or
unscrewing operations.
1.
Features
As compared with other competitor’s
equipment of same kind, the
outstanding particulars of our machine are outlined as
follows:
1) Main
tongs (rotating clamping chuck) is driven by a five pointed star
type great torque hydraulic motor and reducing gears, being simple
in structure and reliable in operation, as distinct from other
machine, say Italian Lazzari one, that rotating clamping
chuck is driven by means of pneumatic clutch-brake group and
reducing gears.
2) The
component to be screwed is automatically clamped in the main tongs
(rotating clamping chuck) when the main tongs (rotating clamping
chuck) rotates, and automatically slack off when reverse
rotating, as distinct from Italian one with hand-operated rotating
chuck.
3) The
component to be crewed is clamped or slack off in the back tongs
(stationary chuck) by means of pneumatic cylinder, as distinct from
Italian one, where the component to be crewed is clamped without
rotation by a stationary chuck-hydraulically
operated
4) The
mandrel and its extension length are supported by means of idle
roller conveyor, that can be positioned according to diameter
(height is adjustable).
5) Insertion
or removal of the mandrel and its extension length in or from this
machine are performed by means of handling equipment, which is
composed of motorized vertical biconical rolls.
2. Constitution
A Mandrel
connecting machine is basically composed of three parts: main
machine including main tong & back tong, roller way and
output roller way. Auxiliary equipment includes hydraulic power
unit, electric cabinet and operation console,
etc.
3. Function
3.1 The
roller way is used for supporting and positioning of mandrel and
relative extension length. The roller way is composed of a series
of driven rollers and a pull-rod system. The height of rollers is
adjustable for the purpose of positioning. The up and down movement
of rollers is carried out by a left side motor-gear reducer set
driven lead screw.
Driven rollers are
all supported on journal bearings, being able to turn even by a bit
force.
3.2
Safety stoppers are fixed outside the entrance of roller way to
prevent mandrel and extension length from deviation owing to
maloperation of operator during lift or putting
down.
3.3 At
the entrance of roller way a pair of leading pressure rollers are
vertically fitted whose rotation is driven by two independent
motor-reducer sets. A mandrel or extension length is moved forwards
to correct screwing or unscrewing position by means of
rotation of the leading pressure rollers. The horizontal central
line of leading pressure roller, horizontal central line of mandrel
and the central line of main tongs are all kept in a line. The
cylinder linked to pull-rod mechanism will make the leading
pressure rollers in harmony with mandrel, and exerts necessary
force for movement of mandrel.
3.4 At
the exit of roller way another pair of leading pressure rollers is
installed, which is also equipped with supports and gearing whose
constitution is the same as one at entrance.
3.5 In
driven rollers of output roller way, motor-driven supporting
rollers I and II are fitted, which act as sustaining while a
mandrel rotates for connecting or disconnecting. The up and down
movement of supporting rollers I and II is carried out
by means of a right side motor-gear reducer set driven lead
screw, thus resulting in positioning.
3.6
Safety stoppers are also fixed outside the exit of every roller way
whose function is same as one outside entrance.
3.7 A
hydraulic power unit is provided to power the hydraulic motor of
the main tongs.
3.8 An
electric cabinet and an operation console are provided to conduct
semi-auto electric control and operator’s reasonable
intervention
4. Configuration & Performance of Main
Machine
The
main machine consists of main tongs, back tongs, pneumatic
cylinder-pull-rod mechanism, double supporting roller mechanism and
single supporting roller mechanism.
4.1 Main Tongs
4.1.1 Working Principle
The main tong is
driven with a hydraulic motor, being able to rotate forwards or
backwards. The power output from hydraulic motor transfers to a
*-buterfly shape clamping mechanism by the way of gear & lazy
pinion-big gear-inner geared ring.
4.1.2 Clamping Principle
*-buterfly shape
self-aligning principle is adopted in design of the clamping
mechanism. A planet gear frame is fixed on the inner geared ring of
a big gear. A certain friction is exerted on the planet gear frame
by a brake placed on the case. While the big gear rotates the three
planet gears in the planet gear frame will follow rotating through
inner geared ring drive, thus driving revolution of *- butterfly
shape cams and tightly clamping a mandrel. If torque is greater
than friction exerted by the brake, the planet gear frame, 3 planet
gears,*- butterfly shape cams and the big gear will all
together rotate, thus performing screwing or unscrewing
operation.
A piece of tong
teeth is fixed on every cam. 3 pieces of tong teeth for 3 cams are
evenly arranged on circumference and tightly seize mandrel. As
torque of tongs varies the clamping force will be directly
proportional variation to torque. The greater the torque, the
deeper the tong teeth seize. Vice versa. The design of the clamping
mechanism ensures minimum damage to work piece(component)incurred
from tong teeth under the condition of required
torque.
4.1.3 Turns of Measuring
The friction drum
is fitted with a geared ring, which is graduated into one tooth for
every 6°and installed with a electro-spectral pulse transmitter.
While the friction drum rotates as planet gear frame numbers of
screwing turn will be calculated on the principle of
one tooth to one pulse. numbers of screwing turn=n×1/*0(n-
numbers of pulse. Measuring of pulse and calculation of turns are
automatically fulfilled and displayed by a computer for operator
reference.
4.2Back Tongs
4.2.1Drive
and Clamping Principle
The
clamping principle of back tongs, basically, is similar to the main
tongs. What differs with the main tongs is that the case of back
tongs is stationary, and the inner geared ring inside the case and
3 planet gears are geared. The revolution of planet gear frame is
driven by a back tongs’ cylinder. As a result, 2 planet gears
rotate, approaching towards work piece or leave away to fulfill
clamping or slackening operation. The initial clamping of back
tongs is carried out by a pneumatic cylinder, as against the
initial clamping of main tongs performed by
brake.
4.2.2 Torque Measurement
The floating back
tongs are fitted with a torque transmitter. On the principle of
“force multiplied by force arm equals torque” torque value is
automatically calculated and dynamically displayed by a
computer.
4.2.3Travel of Back Tongs
The
travel of the back tongs is driven by a pneumatic cylinder for a
certain distance (stroke) . Adjust the back tongs to initial
position prior to screwing. When you set about unscrewing the
piston rod of cylinder retracts maximizing the space between main
tongs and back tongs. In screwing or unscrewing operation the back
tongs move back and forth as mandrel. At this time both of air
intake and exhaust are open to air, so the back tongs are under
floating condition.
4.3Cylinder Pull-rod
Mechanism
The
cylinder pull-rod mechanism is provided with supporting rollers,
furthermore its both sides are linked to supporting rollers of
mandrel. Before the beginning or after completion of screwing or
unscrewing operation the cylinder piston retracts, central lines of
the front and the rear supporting rollers of mandrel being in same
line. In screwing or unscrewing operation the cylinder piston
reaches out when the central line of rear supporting roller( piston
rod end) of mandrel is lower than the central line of supporting
roller of entrance roller way, the rear supporting roller of back
tongs getting off mandrel. In screwing or unscrewing operation
the clamping end of main tongs rotates together with mandrel,
nevertheless the supporting roller is unable to rotate together
with mandrel. Therefore the supporting roller of back tongs has to
get off mandrel.
4.4Double Supporting Roller
Mechanism
A
double supporting roller mechanism is placed between the main &
back tongs so as to increase supporting points. Its structure is
basically similar to the single supporting roller mechanism except
for one more supporting roller. On the principle of parallel motion
(parallelogram) the height of central line for the both supporting
rollers is always kept same, they moreover are at equal height to
central line of single supporting roller. They are all on the same
level.
4.5Single Supporting Roller
Mechanism
A
single supporting roller mechanism is respectively placed outside
the main tongs and back tongs.
4.6Control System & Operation
Console
4.6.1
An electric cabinet and a local operation console are provided for
ease of control and operation.
4.6.2
The electric cabinet includes one PLC for control mandrel
connecting system.
4.6.3
The driving motor for leading pressure rollers is of frequency
converter being able to automatically vary revolutionary
speed.
4.6.4
The Machine will automatically stop screwing operation according to
torque setting. Operators also can carry out interference if
necessary.
4.6.5
Measuring systems for torque and turn of revolution are set in the
control system. Data measured are automatically displayed and
stored by a compute, on which operators may make
control.
5. Technical Parameter
The machine is customized on the basis of
requirements of Buyers. Three most important parameters of the
machines that have been produced are listed as
below.
Model
|
Diameter of mandrel
|
Max. torque
|
Installed power
|
MM**0/**0
|
Ф***-Ф**0 mm
|
**0 KN.m
|
*7
KW
|
MM**0/*0
|
Ф***-Ф*0
|
*0
KN.m
|
|
MM**0/**0
|
Country: |
China |
Model No: |
Model MM
|
FOB Price: |
(Negotiable)
Get Latest Price
|
Place of Origin: |
- |
Price for Minimum Order: |
- |
Minimum Order Quantity: |
- |
Packaging Detail: |
Container |
Delivery Time: |
- |
Supplying Ability: |
- |
Payment Type: |
L/C |
Product Group : |
- |