Twin-machine combined copper tube drawing unit

Abstract

The present invention discloses a double-machine combined copper tube stretching unit, belonging to the field of pipe processing equipment. The pipe can be conveyed on the side of the equipment and can complete secondary stretching, shortening the length of the equipment. The double-machine combined copper tube stretching unit of the present invention includes a feeding device, a first stretching machine and a second stretching machine arranged side by side. A transfer mechanism for conveying the pipe is provided between the first stretching machine and the second stretching machine. One side of the first stretching machine is connected to the feeding device, and the other side is connected to the transfer mechanism. One side of the second stretching machine is connected to the transfer mechanism, and a receiving frame is provided on the other side. A stretching outer die and a stretching inner die for stretching the pipe are provided on the first stretching machine and the second stretching machine. A first conveying device capable of transferring the pipe to the stretching inner die is provided above the stretching outer die. A second conveying device capable of changing the position of the stretching inner die to realize pipe stretching is provided in front of the stretching outer die.

Description

Technical Field

[0001] The present invention relates to the field of pipe processing equipment, and particularly to a double-machine combined copper tube stretching unit.

Background Art

[0002] When producing long pipes, generally, thick and short pipes are first produced to shorten the process of producing pipe blanks, and then a stretching machine is used to draw the pipes to produce thin and long pipes, so that the length of the pipes will be greatly extended. When producing coiled pipes, the drawn pipes can be coiled and stored, while when producing branch pipes, they cannot be stored in this way, so the production length of the equipment is relatively long.

[0003] In the prior art, secondary stretching is generally used to draw pipes. In this way, although the number of die passes can be reduced and the pipes can be protected from breaking during the stretching process, the production line of the pipes will be longer and a larger site is required to accommodate the equipment. If the pipes can be conveyed on the side, the equipment for the two stretches can be arranged side by side to shorten the equipment length. Therefore, a new type of stretching unit needs to be redesigned.

Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and propose a double-machine combined copper tube stretching unit, in which the pipes can be conveyed on the side of the equipment and can complete secondary stretching, shortening the length of the equipment.

[0005] To solve the above technical problem, the present invention adopts the following technical solutions:

[0006] A double-machine combined copper tube stretching unit, comprising a feeding device, a first stretching machine and a second stretching machine arranged side by side. A transfer mechanism for conveying the pipes is provided between the first stretching machine and the second stretching machine. One side of the first stretching machine is connected to the feeding device, and the other side is connected to the transfer mechanism. One side of the second stretching machine is connected to the transfer mechanism, and a receiving frame is provided on the other side. The first stretching machine and the second stretching machine are provided with a stretching outer die and a stretching inner die for stretching the pipes. Above the stretching outer die, there is a first conveying device capable of transmitting the pipes to the stretching inner die, and in front of the stretching outer die, there is a second conveying device capable of changing the position of the stretching inner die to realize the stretching of the pipes.

[0007] The double-machine combined copper tube drawing unit of the present invention has two drawing machines and can perform secondary drawing on the tubes. Moreover, when the tubes are conveyed on the feeding device, the first drawing machine, and the second drawing machine, they are all on the side of the equipment. Compared with the secondary drawing equipment in the prior art, the length is much shorter. And after the tubes are subjected to secondary drawing, the tubes are also collected on the side, which reduces the requirements for the site for arranging the equipment. There is no need to design a large place to accommodate this equipment. At the same time, it can reduce the manufacturing, installation, and transportation difficulties of the equipment; on the first drawing machine or the second drawing machine, the tubes can be conveyed through the first conveying device, and at the same time, the tubes can be drawn below the first conveying device. The two drawing machines can operate simultaneously, and the processing efficiency is relatively high; during the drawing process, there are a drawing inner die and a drawing outer die to assist in drawing at the same time, and products with better quality can be obtained.

[0008] Further, the drawing outer die includes a die base and a movable template. A drawing die is provided on the die base, and a peeling die is provided on the movable template. As the tubes are conveyed, they will sequentially pass through the drawing die and the peeling die. First, drawing is performed, and then peeling is performed. The conveyance of the tubes and the drawing and peeling of the tubes can be carried out simultaneously at different height positions of the drawing machine. When peeling, a gap needs to be left between the peeling die and the drawing die to facilitate the waste generated after peeling to fall from the gap. The movable template can move with the peeling die during the drawing process to change its position relative to the die base. And when the tubes pass through the drawing die, the movable template can also move towards the tubes to squeeze the tubes to prompt the tubes to pass through the peeling die, so as to facilitate the equipment to complete the preliminary peeling operation.

[0009] Further, the drawing inner die includes a first core rod and an inner die head located at the end of the first core rod. When drawing the tubes, the inner die head is located inside the drawing die, and the tubes are located between the drawing die and the inner die head. As the tubes are conveyed, they will first pass through the inner die head and then be sleeved on the first core rod to facilitate the second conveying device to change the position of the tubes. When the inner die head is located inside the drawing die, the tubes will be squeezed between the two, and the drawn tubes can be obtained after pulling the tubes.

[0010] Further, a slidable clamping trolley is also provided on the first drawing machine and the second drawing machine. The clamping trolley is located behind the drawing outer die. During the drawing process, the tubes first pass through the drawing die and then through the peeling die. The clamping trolley can clamp the exposed ends of the tubes and then drag the tubes to move to complete the subsequent drawing and peeling.

[0011] Further, the first conveying device includes a plurality of first rollers disposed above the stretching outer die and a first motor for driving the rotation of the first rollers. The first conveying device is located behind the stretching inner die. The movement of the pipe towards the stretching inner die on the first stretching machine or the second stretching machine is achieved by the first conveying device. Under the action of the gravity of the pipe itself, a considerable frictional force will be generated between the pipe and the first rollers. With the driving of the first rollers by the first motor, the first rollers can push the pipe to move continuously while rotating. The plurality of first rollers can excellently support the pipe, enabling the pipe to remain stable during the conveying process.

[0012] Further, the first conveying device further includes a second roller and a first lifting cylinder for controlling the lifting of the second roller. The pipe is clamped between the first roller and the second roller during conveying. The first lifting cylinder can control the lifting of the second roller. During the process of conveying the pipe, the pipe is clamped between the first roller and the second roller, increasing the frictional force between them, so that during the conveying process, the situation of slipping will not occur, and the pipe can be conveyed more stably.

[0013] Further, the second conveying device includes a turntable and a second motor for driving the rotation of the turntable. A sleeve is provided on the turntable, and the stretching inner die is arranged inside the sleeve. The turntable can rotate under the action of the second motor and can drive the sleeve and the first core rod to rotate synchronously while rotating. If the conveying device has completed the conveying of the pipe, the pipe will be sleeved outside the first core rod and rotate synchronously with the turntable, changing the position of the pipe in the vertical direction.

[0014] Further, a second core rod connected to the stretching inner die is further provided inside the sleeve, and the second conveying device further includes a driving member for driving the movement of the second core rod. When the driving member 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, pushing them towards the stretching outer die for stretching the pipe.

[0015] Further, the feeding device includes a frame and a lifting device provided on the frame. A guiding portion for guiding the pipe to be conveyed onto the first conveying device is provided between the frame and the first stretching machine, and the lifting device can convey the pipe onto the guiding portion. The pipes to be processed are stacked on the frame and can be lifted upward under the action of the lifting device. There are mutual acting forces between the pipes. As the pipes are lifted, the mutual acting forces will push the uppermost pipe to move onto the guiding portion and then move along the guiding portion to the first conveying device of the first stretching machine.

[0016] Further, a pipe conveying plate is provided below the stretching outer die on the first stretching machine and the second stretching machine. The pipe conveying plate on the first stretching machine can guide the stretched pipe to move onto the transfer mechanism, and the pipe conveying plate on the second stretching machine can guide the stretched pipe to move into the material receiving frame. After the stretching is completed, the pipe will fall onto the pipe conveying plate. On the first stretching machine, the pipe will move along the pipe conveying plate onto the transfer mechanism and can be transmitted to the second stretching machine under the action of the transfer mechanism. The pipe that has completed stretching on the second stretching machine will also fall onto the pipe conveying plate and move along the surface of the pipe conveying plate into the material receiving frame, playing a role in guiding the movement of the pipe to achieve the side transmission of the pipe in the equipment.

[0017] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings.

Description of the Drawings

[0018] The following further describes the present invention with reference to the drawings:

[0019] Figure 1 It is a schematic structural diagram of a double-machine combined copper pipe stretching unit in an embodiment of the present invention;

[0020] Figure 2 It is a side view of the stretching machine in an embodiment of the present invention;

[0021] Figure 3 For Figure 2 An enlarged schematic view of part A in

[0022] Figure 4 For Figure 2 An enlarged schematic view of part B in

[0023] Figure 5 It is a schematic structural diagram of the stretching outer die in an embodiment of the present invention;

[0024] Figure 6 It is a partial top view of the stretching machine in an embodiment of the present invention;

[0025] Figure 7 It is a schematic structural diagram of the transfer mechanism in an embodiment of the present invention;

[0026] Figure 8 It is a schematic structural diagram of the feeding device in an embodiment of the present invention.

[0027] Reference numerals:

[0028] Feeding device 100, lifting device 110, third roller 111, winding wheel 112, third motor 113, first frame 120, second frame 130, guiding part 140, first guiding surface 141, second guiding surface 142, belt 150, material blocking device 160, second lifting cylinder 161, blocking block 162;

[0029] First stretching machine 201, second stretching machine 202, pipe conveying plate 210, centering mechanism 220, fixing frame 221, trapezoidal ring body 222, floating roller 223, elastic member 224;

[0030] Transfer mechanism 300, chain belt 310, load-carrying object 320;

[0031] Receiving frame 400;

[0032] External stretching die 510, die base 511, stretching die 512, peeling die 513, movable template 514, oil cylinder 515, internal stretching die 520, first core rod 521, internal die head 522, clamping trolley 530;

[0033] First conveying device 610, support frame 611, first roller 612, first motor 613, clamping component 614, second roller 6141, first lifting cylinder 6142, second conveying device 620, flipping plate 621, second motor 622, sleeve 623, second core rod 624, adjusting component 625, adjusting motor 6251, adjusting sleeve 6252.

Specific embodiments

[0034] The technical solutions of the embodiments of the present invention will be explained and described below with reference to the accompanying drawings of the embodiments of the present invention. However, the following embodiments are only the preferred embodiments of the present invention and not all of them. Based on the embodiments in the embodiments, other embodiments obtained by those skilled in the art without creative efforts all fall within the protection scope of the present invention.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0036] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more, unless otherwise clearly defined.

[0037] In the present invention, unless otherwise clearly specified and defined, terms such as "mounted", "connected", "coupled", "fixed", etc. should be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present invention, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0039] Embodiment 1

[0040] Referring to Figures 1 to 8 , this embodiment provides a double-machine combined copper tube stretching unit, which includes a feeding device 100, a first stretching machine 201 and a second stretching machine 202 arranged side by side. A transfer mechanism 300 for transferring the copper tube is provided between the first stretching machine 201 and the second stretching machine 202. One side of the first stretching machine 201 is connected to the feeding device 100, and the other side is connected to the transfer mechanism 300. One side of the second stretching machine 202 is connected to the transfer mechanism 300, and a receiving frame 400 is provided on the other side. A stretching outer die 510 and a stretching inner die 520 for stretching the copper tube are provided on the first stretching machine 201 and the second stretching machine 202. A first transfer device 610 capable of transferring the copper tube to the stretching inner die 520 is provided above the stretching outer die 510. A second transfer device 620 capable of changing the position of the stretching inner die 520 to achieve stretching of the copper tube is provided in front of the stretching outer die 510.

[0041] The double-machine combined copper tube stretching unit of the present invention has two stretching machines, which can perform secondary stretching on the tubes. Moreover, when the tubes are conveyed on the feeding device 100, the first stretching machine 201, and the second stretching machine 202, they are all on the side of the equipment. Compared with the secondary stretching equipment in the prior art, the length is shortened a lot. And after the tubes complete secondary stretching, the tubes are also collected on the side, which reduces the requirements for the site where the equipment is arranged, and there is no need to design a large place to accommodate this equipment. At the same time, it can reduce the manufacturing, installation, and transportation difficulties of the equipment; on the first stretching machine 201 or the second stretching machine 202, the tubes can be conveyed by the first conveying device 610, and at the same time, the stretching of the tubes can be carried out below the first conveying device 610. The two stretching machines can operate simultaneously, and the processing efficiency is relatively high; during the stretching process, there are the stretching inner die 520 and the stretching outer die 510 assisting in stretching at the same time, and products with better quality can be obtained.

[0042] Referring to Figure 3 and 4 , the stretching machine can be divided into upper and lower layers. The stretching outer die 510 is located in the lower layer, the first conveying device 610 is located in the upper layer, and the second conveying device 620 can control the switching of the stretching inner die 520 between the upper and lower layers. When the tubes are conveyed in the upper layer, they are driven by the first conveying device 610 and move towards the stretching inner die 520. The second conveying device 620 can change the position of the tubes and transfer the tubes from the upper layer to the lower layer, so that they can be conveyed in the lower layer to complete the stretching of the tubes.

[0043] Referring to Figure 5 , wherein, the stretching outer die 510 includes a die base 511, a stretching die 512, and a peeling die 513. During the continuous conveying process, the tubes will successively pass through the stretching die 512 and the peeling die 513, first perform stretching, and then perform peeling. The conveying of the tubes and the stretching and peeling of the tubes can be carried out simultaneously at different height positions of the stretching machine.

[0044] During the peeling process, a lot of waste materials will be generated, and these waste materials need to be discharged. There needs to be a gap between the peeling die 513 and the stretching die 512 to facilitate the discharge of the waste materials. Therefore, the outer stretching die 510 further includes a movable template 514. The movable template 514 can move relative to the die holder 511. The peeling die 513 is arranged on the movable template 514. Two oil cylinders 515 are provided on the die holder 511. The push rods on the oil cylinders 515 are connected to the movable template 514, so as to control the movement of the movable template 514. The movable template 514 can drive the peeling die 513 to move during the stretching process, changing its position relative to the die holder 511, generating a gap between the stretching die 512 and the peeling die 513. And when the pipe passes through the stretching die 512, the movable template 514 can also move towards the pipe, so that the movable template 514 can extrude the pipe, and the pipe can pass through the peeling die 513, so as to avoid the situation that peeling cannot be completed due to insufficient driving force of the second conveying device 620 on the pipe.

[0045] Refer to Figure 1 and 6 In addition, a slidable clamping trolley 530 is also provided on the first stretching machine 201 and the second stretching machine 202. The clamping trolley 530 is located at the rear side of the outer stretching die 510. When the end of the pipe extends out of the peeling die 513, the clamping trolley 530 can quickly clamp this section of the peeled pipe for subsequent stretching and peeling. The displacement of the clamping trolley 530 on the first stretching machine 201 or the second stretching machine 202 is controlled by a reciprocating motor (not shown in the figure). The reciprocating motor is arranged at the end of the first stretching machine 201 or the second stretching machine 202 far from the second conveying device 620, and the distance between the reciprocating motor and the clamping trolley 530 is relatively close, which is convenient for controlling the clamping trolley 530.

[0046] Wherein, the inner stretching die 520 includes a first core rod 521 and an inner die head 522 located at the end of the first core rod 521. When stretching the pipe, the inner die head 522 is located inside the stretching die 512, and the pipe is located between the stretching die 512 and the inner die head 522. As the pipe is conveyed, it will first pass through the inner die head 522 and then be sleeved on the first core rod 521. The second conveying device 620 transfers the first core rod 521 sleeved with the pipe to the lower part and continues to drive the pipe to move towards the outer stretching die 510. At the same time, the inner stretching die 520 also moves synchronously. The inner die head 522 enters the stretching die 512, and the pipe is squeezed between the inner die head 522 and the stretching die 512. As the clamping trolley 530 moves, it pulls the pipe to continuously pass through between the inner die head 522 and the stretching die 512, thus completing the stretching of the pipe.

[0047] Refer to Figure 8, at the same positions on the first stretching machine 201 and the second stretching machine 202, there is a pipe conveying plate 210. The pipe conveying plate 210 is located below the clamping trolley 530. After the stretching and skinning of the pipe are completed, the clamping trolley 530 will release the pipe, causing the pipe to fall onto the pipe conveying plate 210 and move to the transfer mechanism 300 or into the receiving frame 400 under its guidance.

[0048] One end of the pipe transfer mechanism 300 is connected to the first stretching machine 201, and the other end is connected to the first conveying device 610 of the second stretching machine 202, so that the pipe processed by the first stretching machine 201 can be transferred to the first conveying device 610 of the second stretching machine 202 to start the second conveying and stretching.

[0049] Refer to Figure 7 , wherein, the transfer mechanism 300 includes chain belts 310 arranged at intervals, the pipe conveying plate 210 is arranged between the chain belts 310, and there are a plurality of load carriers 320 on the chain belts 310. The plurality of load carriers 320 can move with the transmission of the chain belts 310. After contacting the pipe on the pipe conveying plate 210, the pipe can be held between the load carriers 320 and the chain belts 310, and finally can be transmitted to the first conveying device 610 of the second stretching machine 202 with the transmission of the chain belts 310.

[0050] There is a sensor (not marked in the figure) on the chain belt 310, which can sense whether the chain belt 310 is already full of pipes. When the chain belt 310 can no longer carry pipes, the feeding device 100 will stop feeding the first stretching machine 201 until there is a vacancy on the chain belt 310.

[0051] Embodiment 2

[0052] This embodiment specifically illustrates the structure of the first conveying device 610. Specifically: Refer to Figure 3 and 8 , the first conveying device 610 includes multiple pairs of support frames 611 arranged at intervals. The support frames 611 are provided with first rollers 612 and a first motor 613 for driving the first rollers 612 to roll. The support frames 611 are arranged on both sides of the stretching machine, and the first rollers 612 are arranged between each pair of support frames 611 and above the clamping trolley 530. The movement of the pipe on the first stretching machine 201 or the second stretching machine 202 towards the stretching inner mold 520 is realized through the first conveying device. Under the action of the gravity of the pipe itself, there will be a certain friction force between the pipe and the first rollers 612. With the driving of the first motor 613 on the first rollers 612, the first rollers 612 can push the pipe to move continuously while rotating. The multiple first rollers 612 can support the pipe very well, enabling the pipe to remain stable during the conveying process.

[0053] There is only one first motor 613, which is arranged at one end close to the stretching outer die 510 and can drive two first rollers 612 to rotate simultaneously. The remaining first rollers 612 only play a supporting role and can rotate relative to the support frame 611, reducing the influence of friction on the transmission of the pipe.

[0054] The first conveying device 610 further includes a clamping member 614 arranged on the support frame 611 for clamping the pipe. The clamping member 614 includes a second roller 6141 and a first lifting cylinder 6142 for controlling the lifting of the second roller 6141. There are two clamping members 614, which are respectively arranged above the first rollers 612 controlled by the first motor 613. Under the action of the first lifting cylinder 6142, the second roller 6141 can clamp the pipe between the first roller 612 and the second roller 6141, thereby increasing the friction during transmission and keeping the pipe stable. The second roller 6141 can also rotate relative to the support frame 611, so it will not slip during the transmission process.

[0055] Embodiment Three

[0056] This embodiment specifically illustrates the structure of the second conveying device 620. Specifically: Refer to Figure 4 , the second conveying device 620 includes a turning disk 621 and a second motor 622 for driving the turning disk 621 to rotate. There are two sleeves 623 on the turning disk 621, and the stretching inner die 520 is arranged in the sleeves 623. The turning disk 621 can rotate 180° under the action of the second motor 622. While rotating, it can drive the sleeves 623, the first core rod 521, and the pipe sleeved outside the first core rod 521 to rotate synchronously, changing the vertical position of the pipe and realizing the up and down position replacement. After the replacement is completed, the first conveying device 610 can convey the pipe into the upper sleeve 623 again.

[0057] In addition, in order to enable the second conveying device 620 to convey the pipe to the stretching outer die 510, a second core rod 624 connected to the first core rod 521 is further arranged in the sleeve 623. The diameter of the second core rod 624 is larger than the diameter of the pipe. A driving member (not marked in the figure) for driving the second core rod 624 to move is also arranged on the turning disk 621. When the driving member pushes the second core rod 624 to move, the second core rod 624 can push the first core rod 521 and the pipe wrapped outside the first core rod 521 to move and push them towards the stretching outer die 510 for pipe stretching.

[0058] Embodiment Four

[0059] This embodiment proposes an adjusting assembly 625 on the basis of the above embodiment. Specifically: Refer to Figure 4, during stretching, the pipe is stretched under the combined action of the inner die head 522 and the stretching die 512. When the pipe moves towards the second conveying device 620 under the action of the first conveying device 610, it will pass through the inner die head 522 and then sleeve outside the first core rod 521. Part of the pipe will protrude from the end of the first core rod 521. Subsequently, after passing through the second conveying device 620 to complete the up-and-down position replacement, the second core rod 624 pushes the first core rod 521 and the pipe sleeved on the first core rod 521 to move. The inner die head 522 enters into the stretching die 512. At this time, that part of the protruding pipe is already outside the stretching die 512. The clamping trolley 530 can clamp this section of the pipe and start the stretching operation of the pipe.

[0060] Since the stroke of the driving part remains unchanged, the displacement amounts of the second core rod 624 and the first core rod 521 will not change. However, there needs to be a certain distance between the inner die head 522 and the stretching die 512 to achieve normal processing. But during long-term use, the distance between the inner die head 522 and the stretching outer die 510 will change, and their distance may not be the optimal distance during the initial use. Therefore, an adjusting component 625 is provided on the turning disk 621 to change the position of the second core rod 624 in the axial direction, thereby changing the overall positions of the first core rod 521 and the second core rod 624 to ensure normal processing and the quality of the product.

[0061] The adjusting component 625 is arranged on the turning disk 621 and includes two symmetrically arranged adjusting motors 6251. An adjusting sleeve 6252 cooperating with the second core rod 624 is provided on the turning disk 621. During operation, the adjusting motor 6251 can change the position of the second core rod 624 in the adjusting sleeve 6252, thereby changing the positions of the first core rod 521 and the second core rod 624. The two adjusting motors 6251 can respectively adjust the second core rod 624 at different positions.

[0062] Embodiment Five

[0063] Refer to Figure 3 , on the basis of Embodiment Four, this embodiment adds a centering mechanism 220. When the pipe is transmitted from the first conveying device 610 to the stretching inner die 520, it needs to be aligned with the inner die head 522 of the first core rod 521 to sleeve outside the first core rod 521 for convenient subsequent stretching operation. The centering mechanism 220 can guide the pipe to be transmitted towards the first core rod 521. The specific implementation method is as follows: A fixing frame 221 is provided on the stretching machine. A trapezoidal ring body 222 is provided on the fixing frame 221. The diameters on both sides of it are different. The diameter on the side close to the first conveying device 610 is larger to facilitate the pipe to enter into the trapezoidal ring body 222. The first core rod 521 also enters into the trapezoidal ring body 222 under the action of the driving part, thereby shortening the distance between the pipe and the inner die head 522 and facilitating the transmission of the pipe.

[0064] In addition, in order to ensure that the first core rod 521 is located at the center of the trapezoidal ring body 222, a pair of floating rollers 223 are provided on the fixed frame 221. The floating rollers 223 are connected to the fixed frame 221 via an elastic member 224 and have the ability to float up and down. They can clamp the first core rod 521 and keep it at the center of the trapezoidal ring body 222 via the action of the elastic member 224.

[0065] Embodiment 6

[0066] Reference Figure 8 The present embodiment specifically describes the structure of the feeding device 100. Specifically, the feeding device 100 includes a frame and a lifting device 110. The frame is divided into a first frame 120 and a second frame 130. The second frame 130 is close to the first stretching machine 201. A guide portion 140 is provided between the second frame 130 and the first stretching machine 201. A belt 150 is provided between the ends of the first frame 120 and the second frame 130. The pipe is placed on the belt 150. The first frame 120 is provided with a third roller 111. The lifting device 110 includes a reel 112 and a third motor 113 that drives the reel 112 to rotate. One end of the belt 150 is connected to the second frame 120. The frame 130 is fixed, and the other end is fixed to the winding wheel 112 after passing the third roller 111. The rotation of the winding wheel 112 can be controlled by the third motor 113. When the winding wheel 112 rotates, the belt 150 can be wound on its surface to achieve the tension of the belt 150 and the rise of the pipe. After the motor is reversed, the winding wheel 112 releases the wound belt 150 to relax it and the pipe descends. The belt 150 maintains contact with the third roller 111. When the belt 150 is relaxed or tensioned and moves, it can drive the third roller 111 to move synchronously, thereby reducing the wear of the belt 150 caused by the relaxation or tensioning process and extending the service life.

[0067] The height of the first rack 120 is higher than that of the second rack 130. Therefore, as the pipe continues to rise, the obstruction to the pipe at the second rack 130 disappears first, which can ensure that the moving direction of the pipe is definitely towards the guide portion 140, and the belt 150 can form an arc-shaped belt support with one end higher than the other end, and the lowest point is not located between the first rack 120 and the second rack 130, but is more biased towards the second rack 130. Therefore, the acting force between the pipes will make the pipe more inclined to move towards the second rack 130, and can move to the guide portion 140 more quickly, which can reduce the height required to lift the pipe and reduce power consumption.

[0068] The guide portion 140 is provided with a first guide surface 141 and a second guide surface 142. The first guide surface 141 can guide the pipe to roll between the first frame 120 and the second frame 130, and the second guide surface 142 can guide the pipe to roll onto the first stretching machine 201. Therefore, when the pipe is lifted upward by the lifting device 110, part of the pipe will move to the guide portion 140. As the belt 150 descends, part of the pipe will remain on the guide portion 140. The pipe on the first guide surface 141 rolls down onto the belt 150, and the pipe on the second guide surface 142 rolls toward the first stretching machine 201. The first guide surface 141 and the second guide surface 142 can be inclined surfaces or curved surfaces, thereby realizing automatic loading.

[0069] However, the first conveying device 610 of the first stretching machine 201 can only convey one pipe at a time during operation, so when conveying pipes to the stretching machine, they can only be conveyed one by one. Therefore, in order to achieve this purpose, a material blocking device 160 is provided on the second frame 130. The material blocking device 160 can block the pipe from moving toward the first stretching machine 201 on the guide portion 140 when there is a pipe on the stretching machine, and can also release the blocking of the pipe after the stretching machine is free, so that it can move to the stretching machine;

[0070] Under the blocking action of the material blocking device 160, the pipe can stay on the second guide surface 142 or most of the pipe body is located on the second guide surface 142, and remain still under the action of the material blocking device 160. If there are two pipes on the guide part 140, the second pipe cannot continue to move due to the blocking of the first pipe, and will remain on the first guide surface 141 or most of its pipe body is located on the first guide surface 141, and will return to the belt 150 along the first guide surface 141, thereby ensuring that the pipes can be fed one by one without hindering the normal operation of the stretching machine.

[0071] Embodiment 7

[0072] This embodiment specifically describes the structure of the material blocking device 160. Specifically, refer to Figure 8 The material blocking device 160 includes a second lifting cylinder 161 and a blocking block 162 hinged to the end of the piston rod of the second lifting cylinder 161 . The blocking block 162 is rotatably matched with the second frame 130 , and the second lifting cylinder 161 is fixed on the second frame 130 .

[0073] As the second lifting cylinder 161 controls the lifting of the piston rod, it will also push the blocking block 162 to rotate around the connection between it and the second frame 130, so as to block and release the blocking of the pipe.

[0074] In addition, a sensor (not shown in the figure) is provided at the material blocking device 160, which can sense whether there is a pipe in contact with the blocking block 162. When there is a pipe in contact with the blocking block 162, the lifting device 110 stops lifting the pipe (at this time, the blocking block 162 is located at Figure 8 M1 in Figure 8 ), and the pipe stops feeding; when it is sensed that there is no pipe in contact with the blocking block 162 (at this time, the blocking block 162 is located at M2 in ), the lifting device 110 starts to lift the pipe and convey the pipe to the guiding part 140.

[0075] As described above, the above is only the specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the content described in the drawings and the above specific embodiments. Any modification that does not deviate from the functional and structural principles of the present invention will be included in the scope of the claims.

Claims

1. Double-machine combined copper tube stretching unit, Characterized in that: It includes a feeding device, a first stretching machine and a second stretching machine arranged side by side. A transfer mechanism for conveying the pipe is provided between the first stretching machine and the second stretching machine. One side of the first stretching machine is connected to the feeding device, and the other side is connected to the transfer mechanism. One side of the second stretching machine is connected to the transfer mechanism, and a receiving frame is provided on the other side. The first stretching machine and the second stretching machine are provided with an external stretching die and an internal stretching die for stretching the pipe. Above the external stretching die, there is a first conveying device capable of transferring the pipe to the internal stretching die. In front of the external stretching die, there is a second conveying device capable of changing the position of the internal stretching die to realize the stretching of the pipe; the feeding device includes a frame and a lifting device arranged on the frame. A guiding part capable of guiding the pipe to be conveyed onto the first conveying device is provided between the frame and the first stretching machine. The lifting device can convey the pipe onto the guiding part; the frame includes a second frame. The material blocking device includes a second lifting cylinder and a blocking block hinged to the end of the piston rod of the second lifting cylinder. The blocking block is rotationally matched with the second frame. The second lifting cylinder is fixed on the second frame; as the second lifting cylinder controls the lifting and lowering of the piston rod, it will also push the blocking block to rotate around the connection point with the second frame; an inductor is also provided at the material blocking device, which can sense whether there is a pipe in contact with the blocking block. When there is a pipe in contact with the blocking block, the lifting device stops lifting the pipe and the pipe stops feeding; when it is sensed that there is no pipe in contact with the blocking block, the lifting device starts to lift the pipe and convey the pipe to the guiding part.

2. The double-machine combined copper tube stretching unit according to claim 1, Characterized in that: The external stretching die includes a die base and a movable template. A stretching die is provided on the die base, and a peeling die is provided on the movable template.

3. The double-machine combined copper tube stretching unit according to claim 2, Characterized in that: The internal stretching die includes a first core rod and an internal die head located at the end of the first core rod. When stretching the pipe, the internal die head is located inside the stretching die, and the pipe is located between the stretching die and the internal die head.

4. The double-machine combined copper tube stretching unit according to claim 1, Characterized in that: The first stretching machine and the second stretching machine are also provided with a slidable pipe clamping trolley, and the pipe clamping trolley is located behind the external stretching die.

5. The double-machine combined copper tube stretching unit according to any one of claims 1 to 4, Characterized in that: The first conveying device includes a plurality of first rollers arranged above the external stretching die and a first motor for driving the first rollers to rotate. The first conveying device is located behind the internal stretching die.

6. The double-machine combined copper tube stretching unit according to claim 5, Characterized in that: The first conveying device further includes a second roller and a lifting cylinder for controlling the lifting and lowering of the second roller. The pipe is clamped between the first roller and the second roller during conveying.

7. The double-machine combined copper tube stretching unit according to any one of claims 1 to 4, Characterized in that: The second conveying device includes a turnover disk and a second motor for driving the turnover disk to rotate. A sleeve is provided on the turnover disk, and the stretching inner die is arranged in the sleeve.

8. The double-machine combined copper tube stretching unit according to claim 7, characterized in that: A second core rod connected to the stretching inner die is further arranged in the sleeve, and the second conveying device further includes a driving member for driving the second core rod to move.

9. The double-machine combined copper tube stretching unit according to claim 1, characterized in that: A pipe conveying plate is provided below the stretching outer die on the first stretching machine and the second stretching machine. The pipe conveying plate on the first stretching machine can guide the stretched pipe to move onto the transfer mechanism, and the pipe conveying plate on the second stretching machine can guide the stretched pipe to move into the material receiving frame.

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