RU2850252C1 - Pipe rolled metal deovaliser - Google Patents

Abstract

FIELD: performing operations.

SUBSTANCE: invention relates to tube rolled metal deovaliser. Deovaliser comprises hydraulic station built in said truck, control unit and main hydraulic cylinder to create thrust forces from inside straightened pipe, and centralizer made up of carriage arranged inside said guide. Main hydraulic cylinder rod end face has detachable lay-on head and is rigidly jointed at housing bottom with cylindrical extension with its detachable lay-on head. Main hydraulic cylinder is equipped with the rotary support device containing the main hydraulic cylinder initial position and movement assembly and the supporting bushing covering the main hydraulic cylinder housing on the normal running fit, flat flange is rigidly secured at its edges parallel with main hydraulic cylinder housing axis and provided with rotary device composed of worm reduction gear secured thereat parallel with the axis of the housing. Unit of initial position and movement of main hydraulic cylinder is made in form of two supporting hydraulic cylinders arranged in parallel and symmetrically relative to its axis, fixed hingedly by their housings to upper edge of supporting bushing and by their rods to lower end of cylindrical extension.

EFFECT: result is achievement of minimum ovality values of ±10 mm of large-size pipes.

3 cl, 7 dwg

Description

The invention relates to the metallurgical production of pipes and can be used in equipment for calibrating the geometry of rolled metal pipes at the stages of their delivery with variations in diameters, wall thicknesses and lengths using devalizers.

Existing technologies for correcting ovality rely on creating internal thrust forces perpendicular to the pipe axis using hydraulic cylinders. This process is controlled by the operator. Fluid is supplied to and removed from the hydraulic cylinders through appropriate hoses from a hydraulic power unit located outside the pipe or at the correcting point.

A well-known hydraulic centralizer-deovalizer is manufactured by the Scientific and Production Company "Engineering and Technological Service" and is designed for joining pipes with diameters of 1160-1420 mm. It contains a large number of hydraulic cylinders—two rows of expanders with 24 clamps each on the outer contour of the unit, providing a spreading force of 2 x 300 tons. However, its operation requires extensive preparatory work involving bulky equipment, and the deovalization operation is only possible by calibrating the edges of the pipes being joined.

The MK0433 deovalizer-corrector from ABA Hydrocom (Kaluga), adopted as the prototype for the proposed device, implements a two-clamp straightening method that corrects the ovals (straightens the ends) of adjacent pipes before welding. This device consists of a self-contained hydraulic power unit, four power hydraulic cylinders, two orientation hydraulic cylinders, two brake hydraulic cylinders, a hydraulic motor for moving the carriage, and a control system. The deovalizer clamps are mounted on a rotating frame and are positioned within it during pipe processing. They create the required plastic deformation only at the end, thereby ensuring the specified oval shape, which is determined by the control system based on the results of measuring the counter oval.

There are UPO-G pipe ovality correction devices manufactured by Gazstroymashina LLC. One of them, the UPO1021-G, is a column-type thrust device comprising a stand with upper and lower shoes that accommodate the curvature of the inner diameter of the pipe being repaired, and a hydraulic jack rated for a force of 12 tons. However, judging by the advertising, their use is limited to straightening the ovality of pipe ends.

A device for straightening pipe ends is known, represented by utility model patent RU 139682 U1, published April 20, 2014, Bulletin No. 11, which serves as a prototype for the proposed solution. It comprises upper and lower supports, a hydraulic jack and pump, and a high-pressure hose. The upper support is telescopically connected to the axle via a screw, the jack is connected to a hollow rod, and a rod is connected to the axle and lower support. All prescribed pipe de-ovalization functions are performed manually.

Clearly, the potential capabilities of this device are not sufficient for straightening the geometry of large pipes with significant diameters, lengths, and wall thicknesses, as well as unacceptable ovality and transverse location in cross-sections along the pipe. For example, in the rolling mill of the Chelyabinsk Pipe Rolling Plant, during the final delivery process and geometry calibration of large pipes, a wide range of parameters is encountered: pipe lengths ranging from 8,500 to 12,200 mm, diameters from 2,020 to 2,620 mm, wall thicknesses ranging from 14 to 35 mm, and ovality of +/- 150 mm.

In conditions of such a variety of pipe parameters, ensuring the calibration of their geometry is only possible, in our opinion, through a radical improvement of the deovalization equipment.

The aim of the invention is to improve the equipment for de-ovalization of large-sized pipes with the achievement of minimum ovality values of +-10 mm.

The said objective is achieved by the fact that the tubular metal de-ovalizer, comprising a hydraulic station built into the transport trolley, a control unit and a main hydraulic cylinder with the ability to create spacer forces from inside the pipe for straightening the ovality, is supplemented by a centralizer in the form of a carriage placed in the guide cavity, and by the fact that the main hydraulic cylinder, equipped with a removable attachment head on the end of the rod, rigidly connected in the bottom part of the housing by a cylindrical extension with its replaceable attachment head, is equipped with a support and rotary device with the ability to straighten the ovality in all its locations, containing a supporting sleeve, embracing the housing of the main hydraulic cylinder on the running fit, and a flat flange rigidly connected along its edges with a rotating device fixed on it parallel to the axis of the latter in the form of a worm gear, the output wheel of which is rigidly connected to the said flange, and the worm shaft - with a hydraulic motor with provision for rotation of the main hydraulic cylinder at angles of +- 90 degrees relative to vertical in the transverse plane of the pipe being straightened, and a unit for the initial position and movement of the main hydraulic cylinder in the form of two supporting hydraulic cylinders located parallel and symmetrically relative to its axis, pivotally fixed with their housings to the upper edge of the supporting sleeve and with their rods to the lower end of the cylindrical extension, with the possibility of providing vertical-axial movement of the main hydraulic cylinder, wherein the housing of the worm gear with its rear side is rigidly connected to the carriage of the centralizer, the housing of the latter with power and support rollers is placed in the cavity of the vertical guide on the front side of the transport trolley with the possibility of rolling its walls from the inside, and the centralizer hydraulic cylinder with its rod and housing is pivotally connected respectively to the housing of the carriage and the frame of the transport trolley with the possibility of readjusting the position of the axis of rotation of the main hydraulic cylinder relative to the axis of the pipe being straightened; and, in addition, a control unit of the devalizer, equipped with a remote push-button panel and containing a first three-position hydraulic distributor for changing the position of the rod of the main hydraulic cylinder, a second three-position hydraulic distributor for turning the latter relative to the pipe being straightened, a third three-position hydraulic distributor for moving the transport trolley inside the pipe, supplemented by a fourth three-position hydraulic distributor with the possibility of setting the coaxiality of the axis of rotation of the main hydraulic cylinder and the axis of the pipe being straightened and fifth and sixth, interconnected, three-position hydraulic distributors with the possibility of automatically disabling the operation of the supporting hydraulic cylinders and thereby removing the fixation of the main hydraulic cylinder in the short sleeve in the axial direction and turning them on to return the main hydraulic cylinder to the middle initial position.

Also

the transport trolley is equipped with three pairs of non-metallic wheels with spherical working surfaces and is designed with the possibility of longitudinal movement along the inner surface of the straightened pipe using an onboard drive motor-reducer;

replaceable attachment heads with a working surface matched in curvature to the inner surface of the pipe being straightened and equipped with a groove for the possible placement of the convex part of the weld in it during the straightening of the oval.

Fig. 1 shows a general view of the proposed devalizer in axonometry; Fig. 2 - its frontal projection; Fig. 3 - a worm gear with a hydraulic motor; Fig. 4 - a centralizer carriage; Fig. 5 - a front view of the devalizer in its working position inside the pipe being straightened; Fig. 6 shows the working positions of the main hydraulic cylinder inside the deformed pipe with its rotation angles within 90 degrees relative to the axis of the pipe being straightened; Fig. 7 - a hydraulic diagram of the control unit.

The proposed tubular metal de-ovality machine (Figs. 1, 2), designed for pipe ovality correction prior to final delivery in a manufacturing facility, enables the ovality correction process to be performed while the pipe is stationary. It is mounted on the front of the transport trolley 1, which is a frame metal structure supported by three pairs of metal wheels 2, one of which is driven. The drive is implemented by a geared motor and a roller chain. It is connected to the electrical network via a braided power cable. The devalizer includes a main hydraulic cylinder (MHC) 3 with a removable overhead 4 and a cylindrical extension 5 rigidly fixed to the lower end of its housing with the same head 4, and a support and rotary device (SRD) containing a supporting sleeve (SB) 6, covering the MHC housing on a running fit, on the edges 7 of which a flat flange 8 is mounted parallel to the MHC axis 3 with a rotating device coaxially fixed to the latter, made in the form of a worm gear (GR) 9, equipped with a hydraulic motor 10, and an initial position and movement unit of the MHC in the form of two supporting hydraulic cylinders (SC) 11, located parallel and symmetrically relative to its axis, hingedly fixed with their housings to the upper edge 7 of the SB 6 and with their rods to the lower end of the cylindrical extension 5, with the possibility of vertical-axial movement of the MHC 3 in the SRD 6, wherein the rear side of the housing of the CR 9 is attached by means of a flange 12.1 to a flange 12.2 of the carriage (CC) 13 of the centralizer (Fig. 1, 6), which includes a hydraulic cylinder (HC) 14 (Fig. 2a), the rod and the housing of which are pivotally connected, respectively, to the CC 13 and to the frame of the trolley 1, as well as power rollers 15 and support rollers 16 with their rolling on the walls from the inside of the guide 17 (Fig. 1) when the CC 13 moves. The said control unit (Fig. 7), remotely coupled with a push-button remote control, is connected to the hydraulic station 18 and contains three-position hydraulic distributors (TGR) 19 and (TGR) 20, respectively, for changing the position of the rod and rotating the GC 3, a three-position hydraulic distributor (TGR) 21 for extending the rod of the GC 14 when the GC moves 3 relative to the axis of the straightened pipe 22 (Fig. 4, 5), a three-position hydraulic distributor (THD) 23 for moving the transport trolley 1 by means of an on-board gear motor 24, three-position hydraulic distributors (THD) 25 for automatically shutting off the operation of the PC 11 and releasing the fixation of the GGC 3 in the PV 6 in the axial direction and turning them on to return the GGC 3 to its original position. All hydraulic distributors are connected to the buttons of the remote control, two for each, and the control of the operation of the mechanisms is provided according to the principle of holding the button: while the button is pressed, the mechanism operates, when released, its operation stops.

Mounted on the opposite side of bogie 1 are hydraulic power pack 18, with all three-position hydraulic distributors TGR 19-TGR 25 on the top cover of its fluid-filled tank 26. Also located here are extendable supports 27, used to position the de-ovalizer within the straightened pipe 22 using a shop hoist or to correct ovality close to its edge.

The pipe metal de-ovalizer eliminates ovality in the vertical position of the GGC 3 and any other pipes within the range of its rotation from the vertical of +-90 degrees along the entire length of the pipe being straightened.

The operator locates the damaged geometry of pipe 22. The operator moves transport trolley 1 to the ovality correction site and performs all subsequent ovality correction operations remotely using a remote control panel, which contains buttons for controlling the steam for all three-position hydraulic valves designated above, from TGR 19 to TGR 25.

In the initial vertical position of the GGGTs 3, the rod is retracted, and the middle position of its body is fixed using the PC 11 when their cavities are filled with pressurized fluid in accordance with the initial, neutral position of the TGR 25. The OPU, using the CR 9, positions the GGTs 3 in the position necessary for straightening. The KC 13 of the centralizer is located in the cavity of the vertical guide 17 of the trolley 1; its movements are performed using the stroke of the GC rod 14 for centering, i.e., aligning the axis of rotation of the GGTs 3 with the axis of the pipe 22. The positive result of this operation is assessed visually.

When TGR 19 is activated to extend the GGC 3 rod vertically to the location of the pipe geometry irregularity, TGR 25 are automatically activated, fluid "leaves" the working cavities of PC 11, releasing the GGC 3 fixation inside KB 6, and the GGC 3 body "falls" freely, resting with its extension 5 on the inner wall of the pipe being straightened. The straightening process then begins. In this case, the movement of the rod and the displacement of the GGC 3 body and, accordingly, the straightening forces from the pressure of the attachment heads 4 on the wall of the pipe 22, caused by the cantilever suspension of the main hydraulic cylinder, are not transmitted to the supporting structure of the trolley 1. Upon completion of the straightening, TGR 19 is switched to the position of returning the GGC 3 rod to its original position, TGR 25 is activated to operate PC 11 to return the GGC 3 to the middle position. In this case, the centering operation remains unchanged for a pipe of the same diameter. It remains the same here if the orientation of the out-of-roundness points changes within +/- 90 degrees from the vertical in the transverse planes of its cross-sections. If a pipe with a different diameter is received, the centering operation is repeated, and the execution of other operations remains unchanged.

Thus, the following advantages are achieved:

1. The placement of the main hydraulic cylinder GGC3, which has a large mass and dimensions, inside the supporting sleeve PV3 on the running fit with the power fixation of the latter using the supporting hydraulic cylinders PC 11 and the removal of this fixation immediately before and during the straightening operation makes it possible to eliminate the negative influence of the cantilever suspension of GGC 3 and the OPU to the transport trolley, thereby removing the reactive load on the power elements of the devalizer;

2. The introduction of the KC 13 carriage into the design of the deovalizer, moving vertically in the guide 17 of the trolley 1 with the OPU compactly fixed on the same carriage, allows for the effective execution of centering operations of the main hydraulic cylinder of the GGTSZ along the entire length of the straightened pipe and at any locations within +-90 degrees of its cross-section from the vertical of the places of ovality elimination.

The proposed devalizer was designed and manufactured at the Omsk plant of Omsk Tube Rolling Plant, delivered to the Customer, the Chelyabinsk Pipe Rolling Plant, where it passed acceptance tests and was put into operation in August 2024.

Claims (3)

1. A devalizer for rolled metal tubular products, comprising a hydraulic station built into a transport trolley, a control unit and a main hydraulic cylinder configured to create spacer forces from within the pipe being straightened, a centralizer in the form of a carriage in the cavity of a guide, wherein the main hydraulic cylinder is provided with a removable attachment head on the end of its rod, is rigidly connected in the bottom part of the housing to a cylindrical extension with its own removable attachment head, is equipped with a support and rotary device containing a supporting sleeve that envelops the main hydraulic cylinder housing on a running fit, and a flat flange rigidly connected to its edges parallel to the axis of the main hydraulic cylinder housing with a rotating device in the form of a worm gear fixed to it parallel to the axis of the latter, the output wheel of which is rigidly connected to the said flange, and the worm shaft is with a hydraulic motor to ensure rotation of the main hydraulic cylinder at angles of +-90 degrees relative to the vertical in the transverse plane of the pipe being straightened, and an initial position and movement unit the main hydraulic cylinder in the form of two supporting hydraulic cylinders located parallel and symmetrically relative to its axis, pivotally fixed with their housings to the upper edge of the supporting sleeve and with their rods to the lower end of the cylindrical extension with the ability to provide vertical-axial movement of the main hydraulic cylinder in the supporting sleeve, wherein the housing of the worm gear with its rear side is rigidly connected to the carriage of the centralizer, the housing of the latter is placed in the cavity of the vertical guide on the front side of the transport trolley with the ability to roll its power and support rollers around the walls of the vertical guide from the inside, and the centralizer hydraulic cylinder with its rod and housing is pivotally connected respectively to the carriage housing and the frame of the transport trolley with the ability to readjust the position of the rotation axis of the main hydraulic cylinder relative to the axis of the pipe being straightened, wherein the control unit is made with a remote push-button panel and includes a first three-position hydraulic distributor with the ability to change the position of the rod of the main hydraulic cylinder, a second three-position hydraulic distributor for turning the housing of the main hydraulic cylinder relative to the axis of the pipe being straightened, a third three-position hydraulic distributor for moving the transport trolley inside the straightening pipe, a fourth three-position hydraulic distributor, configured to ensure coaxiality of the axis of rotation of the main hydraulic cylinder and the axis of the straightening pipe, and fifth and sixth, interconnected three-position hydraulic distributors, configured to automatically shut off the operation of the supporting hydraulic cylinders and thereby release the fixation of the main hydraulic cylinder in the supporting sleeve in the axial direction and turn them on to return the main hydraulic cylinder to the middle initial position. 2. A de-lineator according to paragraph 1, characterized in that the transport trolley is equipped with three pairs of non-metallic wheels, one of which, closest to the main hydraulic cylinder, is a drive wheel with spherical working surfaces and is designed with the possibility of longitudinal movement of the transport trolley along the inner surface of the pipe being straightened using a drive onboard motor-reducer. 3. A deovalizer according to paragraph 1, characterized in that the removable attachment heads are made with a working surface matched in curvature to the inner surface of the pipe being straightened, and are provided with grooves for the possible placement in them of the convex part of the weld seam of the pipe being straightened during the process of straightening its oval.