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Mandrel Connecting Machine (Seamless Pipe Rolling) Mandrel Connecting Machine (Seamless Pipe Rolling)
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Mandrel Connecting Machine (Seamless Pipe Rolling)

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Country:

China

Model No:

Model MM

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Place of Origin:

-

Price for Minimum Order:

-

Minimum Order Quantity:

-

Packaging Detail:

Container

Delivery Time:

-

Supplying Ability:

-

Payment Type:

L/C

Product Group :

-

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Free Member

Contact Person Mr. Huaran

No.333 Shuhan Road, Chengdu, Sichuan

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Product Specification

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 turnn×1/*0n- 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: 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 : -

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