RU2363566C2 - Device for cutting of pipes - Google Patents

Abstract

FIELD: technological processes.

SUBSTANCE: invention is related to the field of metal plastic working and may be used in continuous pipe welding and profile-bending machines for cutting of moving rolled metal into specific cut lengths. Device for pipes cutting comprises frame, body installed in it with driving spindle, two hingedly fixed double-arm levers and slider joined to hydraulic cylinder. Slider is installed on guide fixed in spindle. Spindle rotation is carried out from drive. At every end of every double-arm lever there is head fixed with driving saw blade, every of which has rotation drive from electric motor. Other ends of double-arm levers are connected to slider by means of traction rods with spherical heads that interact with spherical step-bearings installed at the ends of these levers. Traction rods with spherical heads may be arranged as both solid and length-adjusted. Controlled rods are made of two parts joined to each other by means of nut.

EFFECT: provision of pipes and different profile billet cutting into specific cut lengths.

2 cl, 3 dwg

Description

The invention relates to the field of metal forming, and more specifically to devices for cutting pipes, and can be used in continuous tube welding and roll forming units for cutting moving steel into measured lengths.

A device for cutting pipes is known (see RF patent No. 2207227, class B23D 21/00, application form 10/12/1998, publ. 06/27/2003). This device comprises a bed with a drive spindle, a rotating body and a cutting tool mounted on cranks. The kinematic connection of the cranks with the rotating casing and the drive spindle is made in the form of rigidly fixed in the last pin with rectangular sliders installed with the possibility of movement in the grooves made in the cranks.

The disadvantage of this device is the design complexity due to the multistage kinematic connection from the drive to the cutting tool, which under intense cycles reduces its reliability and maintainability.

Another disadvantage is the cantilever arrangement of the cranks, which at high speeds of the cutting tool causes axial deviations, and therefore, sharply reduces the tool life (reliability).

Another disadvantage of the device is that the cranks are rotated by pins with rectangular sliders, requiring gaps necessary for their movement and not uniform radial load during cutting, which leads to radial vibration of the crank, and this negatively affects the durability of the cutting tool and as a cut.

Of the known devices, the closest in technical essence is the device for cutting pipes described in UK patent No. 1569718, CL. B23D 21/04 claimed 01/14/1977, publ. 06/18/1980

This device comprises a frame, a housing with a drive spindle, two articulated two-arm levers and guide rollers. A head with a drive saw blade is mounted at one end of each of the levers, and the other end of each lever is connected to the hydraulic cylinder. The guide rollers interact with the pipe contour when the spindle rotates. The known device is preferably used for chamfering pipe ends, in particular irregularly shaped pipes. Changes in pressure in hydraulic cylinders due to irregular pipe shape are compensated by accumulators.

A disadvantage of the known design of the device for cutting pipes is that it cannot be used for cutting complex profiles due to the impossibility of passing guide rollers over the surface of a non-continuous profile.

The objective of the present invention is to provide a device that allows for the cutting of pipes and billets of various profiles into measured lengths.

This object is achieved in that a pipe cutting device comprising a frame, a housing mounted on it with a drive spindle, two articulated two-arm levers, at one end of each of which a head with a drive saw blade is mounted, and the hydraulic cylinder according to the invention is equipped with guides fixed on the spindle and the slider located on them, pivotally connected to the hydraulic cylinder and with the free ends of the two-arm levers by means of rods with spherical heads interacting with spherically mi thrust bearings mounted on the ends of these levers. In addition, traction with spherical heads made adjustable in length.

Such a structural embodiment of the device for cutting pipes allows for the cutting of pipes and billets of various profiles into measured lengths.

This is achieved due to the simultaneous start of cutting a symmetrical profile by synchronous reduction of two shoulders levers with saw blades. With an asymmetric profile, the simultaneous start of cutting is carried out by adjustable rods configured for different lengths.

To explain the invention, a specific embodiment of the invention is provided below with reference to the accompanying drawings, in which:

figure 1 shows a device for cutting pipes, General view;

figure 2 is a section aa in figure 1;

figure 3 is a view along arrow B in figure 2.

The pipe cutting device comprises a frame 2 movable on roller bearings 1, a housing 3 mounted thereon with a drive spindle 4, two articulated two-arm levers 5, 6 and a slider 7 connected to the hydraulic cylinder 8. The slider 7 is mounted on a guide 9 mounted on the spindle 4. The rotation of the spindle 4 is carried out from the drive 10 through the gear 11. At one end of each of the two-arm levers 5, 6, a head 12 with a drive saw blade 13 is fixed. Each saw blade 13, mounted in the head 12 of the two-arm levers 5, 6, has a drive rotation 14 from the electric motor 15 through the V-belt drive 16. The other ends of the two shoulders levers 5, 6 are connected to the slider 7 via rods 17 with spherical heads 18 interacting with spherical thrust bearings 19 mounted on the ends of these levers. Rods 17 with spherical heads 18 can be made as solid or adjustable in length. Adjustable rods 17 are made of two parts interconnected by a nut 19.

To fix the workpiece in front of the input and output of the spindle 4, fixing clamps 20 are installed. The frame 2 during cutting of the workpiece moves along the guides 21 from the drive 22 through the gear rack 23.

A device for cutting pipes and billets of various profiles to measured lengths is installed in continuous units.

When the workpiece 24 is moved by a special device (not shown), the required length is measured and a signal is applied to turn on the drive for moving the frame 2. When the workpiece 24 is aligned with the speed of the frame 2, the workpiece is gripped by the fixing clamps 20 and the saw blades 13 are connected by turning the two-arm levers 5, 6 from the hydraulic cylinder 8. The slider 7, connected to the ends of the levers 5, 6 by rods 17 with spherical heads 18, moves along the guide 9, which ensures uniform movement of the saw blades 13.

When introducing the saw blades 13 into the workpiece 24 by an amount determined by sensors (not shown) for each workpiece 24, the spindle 4 drive 10 is turned on with the two-arm levers 5, 6 and saw blades mounted on it 13. When the spindle 4 is rotated through an angle determined for each type of billet 24 sensors and its cutting produce the removal of the saw blade 13 and the return of the spindle 4 to its original position. After that, the clamps 20 are bred, the drive 22 is turned in reverse, through the rail 23, the frame 2 is returned to its original position.

The proposed device for cutting pipes in comparison with the known allows you to cut pipes and billets of various profiles into measured lengths.

Claims (2)

1. A device for cutting pipes, containing a frame mounted on it with a drive spindle, two articulated two-arm levers, at one end of each of which is mounted a head with a drive saw blade, and a hydraulic cylinder, characterized in that it is equipped with a guide mounted on spindle, and a slider located on it, pivotally connected to the hydraulic cylinder and to the free ends of the two-arm levers by means of rods with spherical heads interacting with spherical thrust bearings mounted on ntsah of these levers. 2. The device according to claim 1, characterized in that the traction with spherical heads is made adjustable in length.

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