CN111001669A - Pipe stretcher and stretching unit - Google Patents

Abstract

The invention discloses a pipe stretcher and a stretcher set, belonging to the field of pipe stretching equipment, wherein the pipe conveying and the pipe stretching can be carried out at the same position but at different heights, and the pipe can be conveyed at the side part of the equipment to shorten the length of the equipment, the frame is provided with a conveying device and a turnover device, the frame is arranged below the conveying device and is provided with a stretching die seat and a clamping trolley for clamping the pipe, the turning device can change the position of the tube conveyed by the conveying device in the vertical direction, and the tube is conveyed to the lower part of the conveying device, the stretching mould seat is positioned between the clamping trolley and the turnover device, the clamping trolley is in sliding fit with the frame, dragging the pipe to move to finish the pipe stretching, and conveying the stretched pipe out of the side part of the pipe stretcher.

Description

Pipe stretcher and stretching unit

[ technical field ] A method for producing a semiconductor device

The invention relates to the field of pipe stretching equipment, in particular to a pipe stretching machine and a stretching unit.

[ background of the invention ]

When long tubular product is produced, thick and short tubular product of general production earlier shortens the process of producing the pipe, uses the stretcher to draw tubular product again, produces thin and long tubular product, and the length of tubular product just can prolong greatly, can coil the back with the tubular product after drawing when producing the coil pipe and store, and then can not so deposit during production branch pipe, and consequently the production length of equipment is longer.

In the prior art, a tube is generally drawn by secondary drawing, so that although the number of dies can be reduced, the tube is protected from being broken in the drawing process, the production line of the tube is longer, a larger field is needed for accommodating equipment, if the tube can be conveyed at the side part, the equipment for the secondary drawing can be arranged side by side to shorten the length of the equipment, and therefore, a special drawing machine needs to be designed to realize the side part conveying of the tube and the drawing of the tube in the conveying process.

[ summary of the invention ]

The technical problem to be solved by the invention is to overcome the defects of the prior art and provide a pipe stretcher, wherein the pipe conveying and the pipe stretching can be carried out at the same position but different heights, and the pipe can be conveyed at the side part of the equipment so as to shorten the length of the equipment.

In order to solve the technical problems, the invention adopts the following technical scheme:

the utility model provides a tubular product stretcher, includes the frame, be equipped with conveyer and turning device in the frame, the frame is located conveyer below is equipped with tensile mould seat and is used for the centre gripping dolly of tubular product, turning device can change the position of the tubular product of conveyer transmission in vertical direction to convey tubular product to conveyer below, tensile mould seat in the centre gripping dolly with between the turning device, the centre gripping dolly with frame sliding fit to drag tubular product removal to accomplish the tubular product and stretch, the tubular product after accomplishing the drawing is followed the lateral part of tubular product stretcher spreads out.

The frame can be divided into two-layerly, tubular product can be in upper strata conveying or lower floor's conveying, tubular product when upper strata conveying, by conveyer drive, tubular product removes to turning device department, turning device then can change the position of tubular product, shift tubular product from the upper strata to the lower floor, alright lower floor's conveying in the frame, in lower floor's data send process, tubular product is earlier through tensile mould seat, accomplish the drawing of tip, tubular product tip exposes behind the tensile mould seat, the tubular product can be cliied to the centre gripping dolly, along with the removal of centre gripping dolly, can stimulate tubular product removal, accomplish subsequent tubular product drawing process, and simultaneously, the conveyer of top can convey tubular product when drawing tubular product in the below, the conveying of tubular product and the drawing of tubular product can be gone on the place of same position but the difference of height, the length of equipment has been shortened, the tubular product of drawing completion spreads from the lateral part of equipment, consequently, the place of holding equipment also need not leave the.

Furthermore, the stretching die base comprises a die base, and a stretching die and a peeling die which are arranged on the die base. Along with the conveying of tubular product, can pass through tensile mould and skinning mould in proper order, stretch first, peel again, the conveying of tubular product and the tensile skinning of tubular product can go on simultaneously in the different height positions of frame.

Furthermore, the stretching die base further comprises a movable die plate, the movable die plate can move relative to the die base, and the peeling die is arranged on the movable die plate. When skinning, need leave the clearance between skinning mould and the tensile mould to the waste material that produces after the skin is taken off conveniently drops from the gap, the movable mould board can be taken the skinning mould removal in tensile process, change its position for the die holder, and, after tubular product passed tensile mould, the movable mould board also can move towards tubular product, extrude tubular product and make tubular product pass the skinning mould, thereby can make things convenient for equipment to accomplish preliminary skinning operation, this section tubular product of accomplishing the skinning can be carried to the centre gripping dolly, carry out subsequent drawing, skinning.

Furthermore, conveyer includes the support frame that a plurality of pairs of intervals set up, be equipped with first gyro wheel on the support frame and drive first gyro wheel is rolling first motor. Tubular product removes through transmission in the upper strata of frame and realizes, under the action of gravity of tubular product self, can produce not little frictional force between with first gyro wheel, along with first motor to the drive of first gyro wheel, first gyro wheel alright promote tubular product and constantly remove in the pivoted, can support tubular product to the support frame betterly more, make tubular product can keep steadily in data send process.

Further, the conveying device also comprises a clamping component which is arranged on the supporting frame and used for clamping the pipe. The clamping component can stabilize the pipe, so that the pipe can be kept stable in the conveying process.

Further, the clamping component comprises a second roller and a lifting cylinder for controlling the second roller to lift. The lifting cylinder can control the lifting of the second roller, and the pipe is clamped between the first roller and the second roller in the pipe conveying process, so that the friction force between the first roller and the second roller is increased, the slipping condition cannot occur in the pipe conveying process, and the pipe can be conveyed more stably.

Furthermore, the turnover device comprises a turnover disc and a second motor for driving the turnover disc to rotate, the turnover disc is provided with a sleeve and a first core rod accommodated in the sleeve, and the pipe can be sleeved outside the first core rod and accommodated in the sleeve. The turnover disc can rotate under the action of the second motor, the sleeve and the first core rod can be driven to rotate synchronously while rotating, if the conveying device finishes conveying the pipe, the pipe can be sleeved on the outer side of the first core rod and rotates synchronously along with the turnover disc, and the vertical position of the pipe is changed.

Furthermore, a second core rod connected with the first core rod is further arranged in the sleeve, the diameter of the second core rod is larger than that of the pipe, and a driving piece for driving the second core rod to move is further arranged on the turnover disc. The diameter of the second core rod is larger, so when the driving piece pushes the second core rod to move, the second core rod can push the first core rod and the pipe wrapped outside the first core rod to move, and the pipe is pushed to the drawing die seat to draw the pipe.

Furthermore, an inner die head is arranged at the end part of the first core rod, the turnover disc is further provided with an adjusting assembly, and the adjusting assembly can adjust the distance between the inner die head and the stretching die seat. The stretcher comprises an inner die and an outer die, wherein the outer die is a stretching die on a stretching die seat, the inner die is an inner die head, the stretching of the pipe is realized under the combined action of the inner die head and the stretching die, a certain distance requirement exists between the outer die and the inner die in the stretching process, the distance between the outer die and the inner die can be changed in the long-time use process, and the distance between the outer die and the inner die can be adjusted by an adjusting assembly to realize normal processing.

The utility model provides a stretching unit, includes feed arrangement and the foretell tubular product stretcher of two, feed arrangement two tubular product stretchers set up side by side, be equipped with tubular product transfer mechanism between two tubular product stretchers to realize that tubular product conveys at the lateral part of equipment. The stretching unit comprises two tube stretching machines, the tube can be stretched secondarily, and the tube can be conveyed on the side of the stretching machine under the action of the feeding device and the tube transferring mechanism, so that the overall length of secondary stretching equipment can be shortened.

These features and advantages of the present invention will be disclosed in more detail in the following detailed description and the accompanying drawings.

[ description of the drawings ]

The invention is further described below with reference to the accompanying drawings:

FIG. 1 is a schematic diagram of a configuration of a pipe stretcher according to an embodiment of the present invention;

FIG. 2 is a side view of a tube stretcher according to an embodiment of the present invention;

FIG. 3 is an enlarged schematic view at A in FIG. 2;

FIG. 4 is an enlarged schematic view at B of FIG. 2;

FIG. 5 is a schematic structural diagram of a drawing die holder according to an embodiment of the present invention;

FIG. 6 is a partial top view of a tube stretcher according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a tube stretcher unit according to a sixth embodiment of the present invention.

Reference numerals:

a frame 100;

the device comprises a conveying device 200, a supporting frame 210, a first roller 220, a first motor 230, a clamping part 240, a second roller 241 and a lifting cylinder 242;

the turnover device 300, the turnover disc 310, the second motor 320, the sleeve 330, the first core bar 340, the second core bar 350, the adjusting component 360, the adjusting motor 361 and the adjusting sleeve 362;

the device comprises a drawing die seat 400, a die seat 410, a drawing die 420, a peeling die 430, a movable die plate 440, an oil cylinder 450 and an inner die head 460;

a clamping trolley 500;

the centering mechanism 600, the fixing frame 610, the trapezoidal ring 620, the floating roller 630 and the elastic element 640;

a feeding device 700, a pipe transferring mechanism 800 and a pipe receiving frame 900.

[ detailed description ] embodiments

The technical solutions of the embodiments of the present invention are explained and illustrated below with reference to the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, and not all embodiments. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Example one

Referring to fig. 1 to 6, the invention provides a pipe stretching machine, which includes a frame 100, wherein a conveying device 200 and a turnover device 300 are arranged on the frame 100, a stretching mold seat 400 and a clamping trolley 500 for clamping a pipe are arranged below the conveying device 200 of the frame 100, the turnover device 300 can change the position of the pipe transferred by the conveying device 200 in the vertical direction and transfer the pipe to the lower part of the conveying device 200, the stretching mold seat 400 is arranged between the clamping trolley 500 and the turnover device 300, the clamping trolley 500 is in sliding fit with the frame 100 to drag the pipe to move to complete the stretching of the pipe, and the stretched pipe is transferred out from the side part of the pipe stretching machine.

The rack 100 can be divided into two layers, a pipe can be conveyed on the upper layer or the lower layer, when the pipe is conveyed on the upper layer, the pipe is driven by the conveying device 200 and moves to the turnover device 300, the turnover device 300 can change the position of the pipe and transfer the pipe from the upper layer to the lower layer, so that the pipe can be conveyed on the lower layer of the rack 100, in the lower layer conveying process, the pipe firstly passes through the stretching die seat 400 to complete the stretching of the end part, after the end part of the pipe is exposed out of the stretching die seat 400, the clamping trolley 500 can clamp the pipe, the pipe can be pulled to move along with the movement of the clamping trolley 500, meanwhile, the pipe can be conveyed when the pipe is pulled by the conveying device 200 on the upper part under part, the conveying of the pipe and the stretching of the pipe can be carried out at the same position but different heights, the length of the equipment is shortened, the, therefore, the site for accommodating the equipment does not need to leave a vacant space in the length direction of the equipment for accommodating the stretched pipes.

Referring to fig. 5, the drawing die holder 400 may perform drawing and skinning of a tube, and specifically, the drawing die holder 400 includes a die holder 410, and a drawing die 420 and a skinning die 430 disposed on the die holder 410, and the tube may be drawn after passing through the drawing die 420 and may be skinned when passing through the skinning die 430, and in addition, the tube may be simultaneously transferred by the transfer device 200 on the drawing die holder 400, and the transfer of the tube and the drawing skinning of the tube may be performed at different height positions of the rack 100.

In the peeling process, a lot of waste materials are generated and need to be removed, a gap needs to be formed between the peeling die 430 and the stretching die 420 to facilitate the discharge of the waste materials, therefore, the stretching die base 400 further comprises a movable die plate 440, the movable die plate 440 can move relative to the die base 410, the peeling die 430 is arranged on the movable die plate 440, two oil cylinders 450 are arranged on the die base 410, push rods on the oil cylinders 450 are connected with the movable die plate 440 so as to control the movement of the movable die plate 440, the movable die plate 440 can move along with the peeling die 430 in the stretching process to change the position of the peeling die 430 relative to the die base 410, a gap is generated between the stretching die 420 and the peeling die 430, and after the pipe passes through the stretching die 420, the movable die plate 440 can also move towards the pipe so as to enable the movable die plate 440 to extrude the pipe, so that the pipe can pass through the peeling die 430, so as to avoid the situation that the peeling can not be finished due to insufficient driving force of the turnover device 300 to the pipe; the clamping trolley 500 can also rapidly clamp the section of pipe to be peeled for subsequent stretching and peeling, the displacement of the clamping trolley 500 on the rack 100 is controlled by a reciprocating motor (not shown in the figure), the reciprocating motor is arranged at the end part of the rack 100 far away from the turnover device 300, the distance between the reciprocating motor and the clamping trolley 500 is short, and the control on the clamping trolley 500 is convenient.

Example two

The present embodiment specifically describes a specific structure of the transmission device 200, specifically: referring to fig. 1 and 3, the conveying device 200 includes a plurality of pairs of support frames 210 arranged at intervals, a first roller 220 and a first motor 230 for driving the first roller 220 to roll are arranged on each support frame 210, the support frames 210 are arranged on two sides of the rack 100, the first roller 220 is arranged between each pair of support frames 210 and located above the clamping trolley 500, namely located on the upper layer of the rack 100, the pipe moves on the upper layer of the rack 100 through a transmission device, under the action of gravity of the pipe, a small friction force is generated between the pipe and the first roller 220, the first roller 220 can push the pipe to move continuously while rotating along with the driving of the first motor 230 on the first roller 220, and the plurality of pairs of support frames 210 can support the pipe excellently, so that the pipe can be kept stable in the conveying process.

The first motor 230 is arranged at one end close to the drawing die holder 400, can drive the two first rollers 220 to rotate at the same time, and the rest first rollers 220 only play a supporting role and can rotate relative to the supporting frame 210, so that the influence of friction force on pipe transmission is reduced.

In addition, the conveying device 200 further includes a clamping member 240 disposed on the supporting frame 210 and used for clamping the tube, the clamping member 240 includes a second roller 241 and a lifting cylinder 242 for controlling the second roller 241 to lift, two clamping members 240 are disposed above the first roller 220 controlled by the first motor 230, respectively, the second roller 241 can clamp the tube between the first roller 220 and the second roller 241 under the action of the lifting cylinder 242, so as to increase the friction force during transmission and stabilize the tube, and the second roller 241 can also rotate relative to the supporting frame 210, so that slipping does not occur during conveying.

EXAMPLE III

The embodiment specifically illustrates a specific structure of the flipping unit 300, specifically: referring to fig. 4, the turnover device 300 includes a turnover plate 310 and a second motor 320 for driving the turnover plate 310 to rotate, the turnover plate 310 is provided with two sleeves 330 and a first core bar 340 received in the sleeves 330, a tube may be sleeved outside the first core bar 340 and received in the sleeves 330, and the turnover plate 310 may be disposed on the first core bar 340

The second motor 320 rotates 180 degrees under the action of the second motor, and can rotate simultaneously with the sleeve 330, the first core rod 340 and the pipe sleeved outside the first core rod 340 to rotate synchronously, so that the position of the pipe in the vertical direction is changed, the up-down position replacement is realized, and after the replacement is completed, the conveying device 200 can convey the pipe into the sleeve 330 above.

In order to realize that the turnover device 300 can convey the tube to the drawing die holder 400, the sleeve 330 is further provided with a second core rod 350 connected with the first core rod 340, the diameter of the second core rod 350 is larger than that of the tube, the turnover table 310 is further provided with a driving member (not shown) for driving the second core rod 350 to move, and the diameter of the second core rod 350 is larger, so that when the driving member pushes the second core rod 350 to move, the second core rod 350 can push the first core rod 340 and the tube wrapped outside the first core rod 340 to move and push the tube to the drawing die holder 400 to draw the tube.

Example four

The present embodiment proposes an adjusting assembly 360 on the basis of the above embodiments, specifically: referring to fig. 3 to 5, the pipe drawing needs to have an outer die and an inner die, the outer die and the inner die jointly act to complete the drawing of the pipe, the outer die is a drawing die 420 on a drawing die base 400, the inner die is an inner die 460 arranged at the end of a first core rod 340, when the pipe moves towards a turnover device 300 under the action of a conveying device 200, the pipe passes through the inner die 460 and then is sleeved outside the first core rod 340, then the pipe is displaced in an up-down position through the turnover device 300, the second core rod 350 pushes the first core rod 340 and the pipe sleeved on the first core rod 340 to move, the inner die 460 enters the drawing die 420, the pipe is extruded between the inner die 460 and the drawing die 420, and the pipe is pulled to pass through between the inner die 460 and the drawing die 420 with the movement of a clamping trolley 500, so as.

When the pipe is transferred to the first core bar 340 by the transfer device 200, a part of the pipe protrudes from the end of the first core bar 340, and when the inner die head 460 enters the drawing die 420, the part of the pipe is already outside the drawing die 420, and the clamping cart 500 can clamp the part of the pipe to start the drawing operation of the pipe.

Because the stroke of the driving element is not changed, the displacement amounts of the second core rod 350 and the first core rod 340 are not changed, and a certain distance is required between the inner die and the outer die to realize normal processing, but in the long-time use process, the distance between the inner die 460 and the stretching die holder 400 is changed, and the distance between the inner die and the stretching die holder 400 is not necessarily the optimal distance in the first use, so that the adjusting assembly 360 is arranged on the turnover disc 310 to change the axial position of the second core rod 350, thereby changing the overall position of the first core rod 340 and the second core rod 350, and ensuring normal processing and product quality.

The adjusting assembly 360 is arranged on the flipping disk 310 and comprises two symmetrically arranged adjusting motors 361, an adjusting sleeve 362 matched with the second core bar 350 is arranged on the flipping disk 310, the adjusting motors 361 can change the position of the second core bar 350 in the adjusting sleeve 362 in the operation process, so that the positions of the first core bar 340 and the second core bar 350 are changed, and the two adjusting motors 361 can respectively adjust the second core bars 350 in different positions.

EXAMPLE five

Referring to fig. 3, in this embodiment, a centering mechanism 600 is added on the basis of the fourth embodiment, when the tube is driven on the conveying device, the tube needs to be aligned with the inner die 460 of the first core rod 340 to be sleeved outside the first core rod 340, so as to facilitate the subsequent stretching operation, and the centering mechanism 600 can guide the tube to be conveyed toward the first core rod 340, specifically, the embodiment is as follows: the rack 100 is provided with a fixing frame 610, the fixing frame 610 is provided with a trapezoidal ring body 620, the diameters of two sides of the fixing frame 610 are different, the diameter close to one side of the conveying device 200 is larger, so that the pipes can conveniently enter the trapezoidal ring body 620, the first core rod 340 also enters the trapezoidal ring body 620 under the action of the driving piece, the distance between the pipes and the inner die head 460 is shortened, and the pipes can be conveniently transmitted.

In addition, in order to ensure that the first core rod 340 is located at the center of the trapezoid ring body 620, the fixing frame 610 is further provided with a pair of floating rollers 630, the floating rollers 630 are connected with the fixing frame 610 through elastic members 640, the floating rollers have the ability of floating up and down, can clamp the first core rod 340, and are kept at the center of the trapezoid ring body 620 through the action of the elastic members 640.

EXAMPLE six

Referring to fig. 7, the embodiment further provides a stretching unit, which includes a feeding device 700 and two pipe stretching machines, where the feeding device 700 and the two pipe stretching machines are arranged side by side, and a pipe transfer mechanism 800 is arranged between the two pipe stretching machines to realize the pipe conveying at the side of the apparatus.

The feeding device 700 can transfer the pipe material at the side part of the stretching machine, and transfer the pipe material to the conveying device 200, and the pipe material can be transferred between the two stretching machines through the pipe material transfer mechanism 800, so that the pipe material after the first stretching is completed is transferred to the conveying device of the second stretching machine under the action of the pipe material transfer mechanism 800, and the second stretching is started. Under the common effect of the three, the pipe can be conveyed at the side part of the equipment, so that the length of the pipe secondary stretching unit is shortened.

In addition, the stretcher unit further comprises a pipe collecting frame 900, the pipe collecting frame 900 is located on the side portion of the second stretcher, after the first stretcher finishes the first stretching of the pipe, the pipe falls to the pipe transfer mechanism 800 for conveying, after the second stretcher finishes the second stretching of the pipe, the pipe falls into the pipe collecting frame 900, the pipe is collected, and the subsequent transferring treatment is facilitated.

While the invention has been described with reference to specific embodiments thereof, it will be understood by those skilled in the art that the invention is not limited thereto, and may be embodied in many different forms without departing from the spirit and scope of the invention as set forth in the following claims. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.

Claims (10)

1. A pipe stretcher is characterized in that: the pipe stretching device comprises a frame, wherein a conveying device and a turnover device are arranged on the frame, a stretching die seat and a clamping trolley for clamping a pipe are arranged below the conveying device, the turnover device can change the position of the pipe transferred by the conveying device in the vertical direction and convey the pipe to the position below the conveying device, the stretching die seat is arranged between the clamping trolley and the turnover device, the clamping trolley is in sliding fit with the frame to drag the pipe to move to complete pipe stretching, and the stretched pipe is conveyed out from the side part of the pipe stretching machine.

2. The pipe stretcher of claim 1, wherein: the stretching die base comprises a die base, and a stretching die and a peeling die which are arranged on the die base.

3. The pipe stretcher of claim 2, wherein: the stretching die base further comprises a movable die plate, the movable die plate can move relative to the die base, and the peeling die is arranged on the movable die plate.

4. The pipe stretcher of claim 1, wherein: the conveying device comprises a plurality of pairs of supporting frames arranged at intervals, and a first roller and a first motor for driving the first roller to roll are arranged on the supporting frames.

5. The pipe stretcher of claim 4, wherein: the conveying device further comprises a clamping component which is arranged on the supporting frame and used for clamping the pipe.

6. The pipe stretcher of claim 5, wherein: the clamping component comprises a second roller and a lifting cylinder for controlling the second roller to lift.

7. The pipe stretching machine according to one of claims 1 to 6, characterized in that: the turnover device comprises a turnover disc and a second motor for driving the turnover disc to rotate, the turnover disc is provided with a sleeve and a first core rod accommodated in the sleeve, and a pipe can be sleeved outside the first core rod and accommodated in the sleeve.

8. The pipe stretcher of claim 7, wherein: the sleeve is further internally provided with a second core rod connected with the first core rod, the diameter of the second core rod is larger than that of the pipe, and the turnover disc is further provided with a driving piece for driving the second core rod to move.

9. The pipe stretcher of claim 8, wherein: the end part of the first core rod is provided with an inner die head, the turnover disc is further provided with an adjusting assembly, and the adjusting assembly can adjust the distance between the inner die head and the stretching die seat.

10. A drawing unit is characterized in that: comprising a feeding device and two pipe stretching machines according to claims 1 to 9, arranged side by side, with a pipe transfer mechanism between the two pipe stretching machines to effect the transfer of the pipe at the side of the apparatus.

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