RU2380180C1 - Mill for cold rolling of pipes - Google Patents

Abstract

FIELD: technological processes.

SUBSTANCE: invention is related to the field of pipe rolling, more precisely, to mills for cold rolling of pipes, working stand of which is arranged with movable power bed plate and cartridge, and is related to changing of cartridges. Mill comprises frame with guides, working stand installed on guides and facilities for fixation of power bed plate connecting rods and cartridge. Working stand comprises movable power bed plate with rack bars, movable cartridge with three rollers and gears arranged in its body and lever drive with two pairs of connecting rods with axles. One pair of connecting rods is connected to movable power bed plate, and the other one - with movable cartridge. Body of cartridge is arranged as split and consists of two parts, in one part of which rollers and gears are installed, and the other part of body is connected to the second pair of connecting rods. Both parts of cartridge body are fixed to each other by means of free fingers. In each finger there is wedge installed with underwedge. Stand is equipped with wiring arranged on axle of rolling, which aligns both parts of cartridge body. Mill is equipped with accessory for retention and transportation of cartridge and hydraulic drive for movable bed plate displacement in process of changing. Each facility for fixation of cartridge connecting rods is arranged in the form of limit screws, which are fixed on bracket mounted on frame, where limits screws are installed for support of the cartridge itself.

EFFECT: invention makes it possible to reduce labour intensiveness of cartridge changing in manufacturing of large diametre pipes.

3 cl, 12 dwg

Description

The invention relates to the field of pipe production, and more specifically, to cold pipe rolling mills, the working stand of which is made with a movable power bed and cassette, and for the handling of cassettes.

Known cold rolling pipe mill, and.with. USSR No. 349429, class B21B 31/08, claimed 02/25/71, publ. 09/04/72, containing a frame, a working stand with a fixed bed, a movable cassette, a pair of connecting rods with axles connecting the movable cassette to the drive. For mounting and unpressing the connecting rod axles in the working stand, two special devices are used.

The main disadvantage of the known cold pipe rolling mill is the complexity of cassette transshipment in the production of large diameter pipes, due to the fact that two special devices are required for mounting and unpressing the axles connecting the connecting rods to the cassette, which can be removed and installed only with the help of the crane, since the mass of parts is more than 50 kg

In addition, the drawback of the design of this cold pipe rolling mill is that during cassette transshipment, periodic extraction of the connecting rod axles having a cylindrical interference fit leads to a quick loss of interference, a weakening fit and the need to produce new axes with new landing surface dimensions.

Of the known cold pipe rolling mills, the closest in technical essence is the cold pipe rolling mill described in RF patent No. 2286219, class. B21B 13/18, stated 04/05/05, publ. 10/27/06

This cold tube rolling mill comprises a frame with guides, a working stand with a movable power bed and gear racks, a movable cassette with three rolls and gears located in its body, a linkage drive with two pairs of connecting rods with axles, means for fixing the connecting rods of the power bed and cassette, two special devices for mounting and unloading axles.

The main drawback of the design of this cold-rolling mill is that the production of large-diameter pipes increases the complexity of handling the cassette, since the dimensions and mass of the lever drive, cassettes, rods and axles increase, so special devices for pressing and unloading the axes and the axes themselves have to be removed and installed only with a tap.

In addition, the drawback of the design of the working stand under consideration, as well as the previous one, is that the periodic extraction of the connecting rod axles during cassette transshipment leads to a quick loss of interference, a weakening of the landing and the need to manufacture new axes with new dimensions of the seating surfaces.

The objective of the present invention is to provide a cold rolling mill, which reduces the complexity of transshipment of cassettes in the production of pipes of large diameter.

рычага с двумя крюками и проушинами для захвата, а также затвором с упорными винтами и фиксатором. Каждое средство для фиксации шатунов силовой станины выполнено в виде опоры, шарнирно связанной с винтовой тягой, закрепленной на предусмотренной раме.The task is achieved in that in a cold rolling mill of pipes containing a frame with rails mounted on the rails of the working stand, including a movable power bed with gear racks, a movable cassette with three rolls and gears located in its housing, a linkage drive with two pairs of rods with axes, while one pair of connecting rods is connected to a movable power bed, and the other to a movable cassette, means for fixing the connecting rods of the power bed and cassette, according to the invention, in the working stand the cassette body in is detachable and consists of two parts, in one of which the rollers and gears are directly placed, the other part of the cartridge case is connected to the second pair of connecting rods, while both parts of the cartridge case are fastened together with three fingers, two of which are installed in cylindrical holes with a gap, and one - with the possibility of sliding in an oval groove, and each finger has a wedge with a pin, in addition, the working stand of the mill is equipped with a cassette with rolls located along the axis of rolling and rigidly fixed and gear wiring with a centering protrusion interacting with a bore made in the cassette body part connected to the connecting rods, the mill is also equipped with a device for holding and transporting the cassette and a hydraulic actuator for moving the movable bed during transshipment, and each means for fixing the cassette rods is made in the form of stop screws mounted on a frame-mounted bracket, on which thrust screws are also placed to support the cassette itself. The device for holding and transporting the cartridge is made in the form

a lever with two hooks and eyelets for gripping, as well as a bolt with stop screws and a lock. Each means for fixing the connecting rods of the power bed is made in the form of a support pivotally connected to a screw rod mounted on a provided frame.

Reducing the complexity of cassette transshipment in a cold rolling mill in the production of large diameter pipes is achieved, firstly, due to the fact that the cassette body is detachable in two parts in the mill stand design, so that not the entire cassette body is connected to the connecting rods, but only one of its parts, which is connected to the other part of the cartridge with the help of three fingers, each of which has a wedge with a sublink. As a result, during transshipment, to disconnect the connecting rods from the cartridge case, it is necessary to disconnect both parts of the cartridge case. To do this, wedges from the fingers are manually pressed out manually by means of a screw jack without the aid of a crane, since the mass of the parts is less than 25 kg and the axles connecting the connecting rods to the cassette body are not required.

Secondly, the reduction of the complexity of cassette transshipment in the mill under consideration is achieved through the use of convenient and easy-to-maintain tools for fixing the cassette rods during the transshipment process in the form of screw stops located on the brackets. In addition, these same tools allow during the transshipment process to support the provided screw stops and the cassette body.

Thirdly, the decrease in the laboriousness of transshipment of the cassette of the working stand of this mill is achieved through the use in its design of a device for holding and transporting the cassette, with which a part of the cassette body with fixed rolls is supported until the other part of the casing connected to the connecting rods is disconnected, transported to the transhipment stand cartridges, and the replaced part of the cartridge case with rolls is transported by the same device into the mill stand. The presence of such a device also makes it possible to lighten the weight of the cartridge, since there are no sling tides for transportation in its body, and thereby relieve the linkage drive, reduce energy costs and reduce the complexity of the manufacture of the cartridge.

Fourth, the decrease in the complexity of cassette transshipment of this mill is achieved through the use of a hydraulic actuator in its design, with which the power bed is first moved to an intermediate position, in which the cassette rolls are fixed, while the part of the cassette case associated with the connecting rods is not yet disconnected, and then - in the final position beyond the rolling zone, in which the final separation of the parts of the cassette body and the removal of part of the body with the rollers and gears from the working stand.

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 mill for cold rolling pipes in section,

figure 2 - the same in terms of

figure 3 is a section aa in figure 1,

figure 4 is a section bB in figure 2 with the rods disconnected from the bed,

figure 5 - place In figure 4,

in Fig.6 is a section GG in Fig.5,

Fig.7 is a section DD in Fig.5,

on Fig - section EE in figure 4,

figure 9 is a section bB in figure 2 with a dedicated hydraulic actuator in the final position of the bed,

figure 10 is the same with a fixed cassette in the device for its retention and transportation,

11 is the same with the disconnected parts of the cassette housing and the shifted part of the housing with rollers and gears,

in Fig.12 - place W in Fig.11, a device for holding and transporting with the disconnected part of the cassette with rollers and gears.

The cold tube rolling mill comprises a frame 1 with guides 2, a working stand 3, including a power movable bed 4 with gear racks 5, a movable cassette 6 with a detachable housing consisting of two parts 7, 8, while three rolls 9 are placed in the housing part 7 and gears 10, and part 8 of the housing is connected to a pair of connecting rods 11 by axles 12, and a wiring 13 installed along the rolling axis for pipe passage, a pair of connecting rods 14 with their mounting axles 15 with a power frame 4, a lever drive 16, means for fixing the connecting rods 11 and cassettes 6 and connecting rods 14 of the power bed 4, hydraulic drive moving the bed 4 during transshipment, as well as a device for holding and transporting part 7 of the cassette body 6 with rolls 9 and gears 10.

Parts 7 and 8 of the cassette 6 are interconnected using three fingers 17, each of which has a wedge 18 with a wedge 19, with two fingers installed in the cylindrical holes 20 with a gap, and one finger with the possibility of sliding in the oval groove 21 , which prevents the rotation of parts 7 and 8 of the cassette 6 relative to each other.

The wiring 13 for the passage of the pipe has a centering protrusion 22 and is rigidly fixed in part 7 of the cassette 6. The centering of parts 7 and 8 of the cassette 6 relative to each other is carried out by installing the centering protrusion 22 of the wiring 13 in the bore 23 made in part 8 of the cassette 6.

Each means for fixing the connecting rods 11 of the cartridge 6 includes two pairs of stop screws 24 and 25, mounted on an arm 26 mounted on the frame 1. One pair is used to fix the connecting rods 11, and the other to support part 7 of the cartridge case 6 with rollers 9 and gears 10 through part 8 of the housing until it is disconnected from part 7.

Each means for fixing the connecting rods 14 of the power frame 4 is made in the form of a tilt support 27, pivotally connected to a screw rod 28, mounted on the frame.

The hydraulic drive for moving the power frame 4 is made in the form of two hydraulic cylinders 29 located on the frames, the rods of which are attached to the power frame 4 during transshipment.

рычага 30 с двумя крюками 31 и проушинами 32 для захвата, затвором 33 с упорными винтами 34 и фиксатором 35.The device for holding and transporting the cartridge during transshipment is made in the form

the lever 30 with two hooks 31 and eyelets 32 for gripping, the bolt 33 with the stop screws 34 and the latch 35.

In addition, the cold pipe rolling mill incorporates a screw jack for alternately extruding the wedges 18 from the fingers 17 when disconnecting parts 7 and 8 of the cassette 6 body, as well as three roll holders 9 from a turn during transshipment.

Transshipment of the stand in a cold rolling mill is as follows.

The power bed 2 and the cassette 6 are installed in the extreme forward position. The screw stops 24 lead to the connecting rods 11 for fixing them, and the screw stops 25 to the part 8 of the cassette 6 body through which the entire cartridge 6 is supported. The connecting rods 14 of the power frame 4 are fixed by means of fixation, the axles 15 are removed and the connecting rods 14 are disconnected from the power frame 4. The rods of the hydraulic cylinders 29 are connected to the power frame 4 and take it into an intermediate position until the gears 10 of the cassette 6 mesh with the last tooth of the racks 5 of the power frame 4. The rollers 9 are secured in the cassette 6 body part 7 from a turn by means of holders and then the hydraulic power drive bed 4 is moved to an end position beyond the rolling zone. After that, the device for holding and transporting the cartridge is brought down with a crane, the cartridge 6 is fixed in it, the wedges 18 are pulled out manually from the fingers 17 using the screw jack, the device with the cartridge case part 7 is moved horizontally by the crane until the cantilever part of the fingers 17 will come out of the cassette 6 body part 8, as a result, the parts 7 and 8 of the cassette 6 body are completely disconnected, while the cassette body part 8 is still connected by axles 12 to the connecting rods 11 and is held in space by ntami 24 and 25. Said device is of the retained portion 7 of the cassette case 9 with the rollers 10 and pinions crane lifted and transported to a stand where handling is performed. After performing the necessary transshipment operations with the same device at the stand, part 7 of the cartridge case 6 with rollers 9 and gears 10 is transported to the mill and installed in the working stand 3, where all assembly operations are performed in the reverse order.

The proposed cold pipe rolling mill in comparison with the known ones allows to reduce the complexity of cassette transshipment in the production of large diameter pipes.

Claims (3)

1. Cold pipe rolling mill, comprising a frame with rails mounted on the rails of the working stand, including a movable power bed with gear racks, a movable cassette with three rolls and gears located in its housing, a linkage drive with two pairs of connecting rods with axles, one a pair of connecting rods is connected to a movable power bed, and the second to a movable cassette, means for fixing the connecting rods of the power bed and cassette, characterized in that in the working stand the cassette body is detachable and consists of two parts, in one of which the rolls and gears are placed, and the other part of the cartridge case is connected to the second pair of connecting rods, while both parts of the cartridge case are fastened together with three fingers, two of which are installed in the cylindrical holes of the housings with a gap, and one with the possibility sliding in an oval groove, with a wedge with a wedge in each finger, and the working stand of the mill is equipped with a wiring with a centering protrusion located on the rolling axis and rigidly fixed in the cassette body with rollers and gears, existing with a bore made in the cassette body part connected to the connecting rods, and the mill is equipped with a device for holding and transporting the cassette and a hydraulic drive for moving the movable bed during transshipment, and each means for fixing the cassette rods is made in the form of stop screws mounted on a bracket mounted on the frame, on which the stop screws are located to support the cassette. 2. The mill according to claim 1, characterized in that the device for holding and transporting the cartridge is made in the form of a -shaped lever with two hooks and eyelets for gripping, as well as a shutter with stop screws and a latch. 3. The mill according to claim 1, characterized in that each means for fixing the connecting rods of the power bed is made in the form of a support pivotally connected to a screw rod mounted on a frame.

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