Metal pipe stretching equipment

Abstract

The utility model provides metal pipe stretching equipment, and relates to the technical field of metal pipe machining. The metal pipe stretching equipment comprises a discharging device, a stretching device and a collecting device. A groove for accommodating a metal tube is formed in the side surface of the periphery of a groove disc of the stretching device; the groove disc is provided with a starting point and an ending point which are arranged in the circumferential direction, and a groove between the starting point and the ending point abuts against the metal pipe. The multiple pressing wheels are sequentially arranged on the periphery of the groove disc in the circumferential direction of the groove disc and make rolling contact with the metal pipe so that the metal pipe can be pressed into the groove. The multiple pressing wheels comprise a first pressing wheel set and a second pressing wheel set located between the starting point and the ending point of the groove disc, the first pressing wheel set is close to the starting point of the groove disc, and the second pressing wheel set is close to the ending point of the groove disc. A first included angle is formed between the pressing direction of the first pressing wheel set and the normal direction of the starting point, and a second included angle is formed between the pressing direction of the second pressing wheel set and the normal direction of the ending point. According to the metal pipe stretching equipment, large-tonnage and high-speed stretching of pipes of multiple sizes can be achieved, and the stretching efficiency is greatly improved.

Description

Metal tube stretching equipment Technical Field

[0001] This application relates to the field of metal tube processing technology, and in particular to a metal tube stretching device. Background Technology

[0002] Metal pipes are widely used in daily life and industrial production, such as in water pipes, oil pipelines, and chemical equipment. During the processing of metal pipes, the stretching device and process are particularly important. Through stretching force and die extrusion, the grain size of the metal pipe can be refined, increasing the material's strength and hardness, and enhancing its pressure-bearing capacity and corrosion resistance. Taking copper pipes as an example, after stretching, their strength and hardness increase, making them suitable for use in automotive oil and air lines, improving vehicle stability and reliability. Simultaneously, the dimensional accuracy and surface quality of stretched copper pipes are optimized, improving assembly efficiency and reliability in automobile manufacturing.

[0003] Metal tube stretching devices are generally classified into cam-type stretching devices, track-type stretching devices, disc stretching devices, and V-type disc stretching devices, etc.

[0004] The cam-type stretching device has a relatively simple structure and is suitable for stretching various specifications of pipes. However, due to the complexity of force transmission and the limitations of the equipment structure, the speed is greatly limited during the stretching process of the pipe. Generally, the stretching speed is below 120m / min. Once this speed is exceeded, it is very easy to cause structural damage to the equipment and make it impossible to continue production and use.

[0005] Tracked stretching machines use tracks to continuously and stably stretch pipes. Because the stretching force is provided by the tracks, there are a large number of dies, and the matching and consistency of each die are very important. In addition, die marks are easily left on the surface of the pipe. Therefore, they are rarely used in the field of metal pipe stretching.

[0006] The disc stretching device has grooves on the outer surface of the disc for guiding the metal tube; these grooves are spirally arranged on the outer surface of the disc. Pressure rollers press the metal tube into the grooves. Driven by a motor, the disc rotates at a constant speed, and the friction between the grooves and the metal tube provides stretching force. The disc stretching machine has high production efficiency, but its structure is relatively complex.

[0007] The V-disc stretching device, through its V-disc design, ensures more uniform stress distribution on the pipe during the stretching process. However, due to its structural limitations, current V-disc stretching devices are primarily used for stretching small-diameter metal pipes at low tonnage and low speeds (generally less than 90 m / min). Increasing the stretching force can cause pipe deformation, making it unsuitable for stretching large-tonnage pipes. It is generally used to provide low-tonnage stretching force for internally threaded pipes. Due to the relatively low stretching force, the applicable pipe sizes are relatively small, typically producing pipes with a diameter of 12.7 mm or less.

[0008] In view of the shortcomings of the existing technology, there is an urgent need to provide a stretching device that can achieve high tonnage and high speed of pipe stretching and is applicable to multiple sizes of pipe stretching, so as to improve stretching efficiency and ensure the quality of the produced products. Summary of the Invention

[0009] In view of the above problems, this application provides a metal tube stretching device that can achieve high-tonnage and high-speed stretching of tubes of various sizes, greatly improving the stretching efficiency of the tubes and ensuring the quality of the stretched tubes.

[0010] To achieve the above objectives, the embodiments of this application provide the following technical solutions:

[0011] This application provides a metal tube stretching device, including:

[0012] The device includes a feeding device, a stretching device, and a taking-up device. The feeding device is used to release the raw material of the metal tube, and the taking-up device is used to wind the finished metal tube to obtain a metal coil.

[0013] The stretching device includes a rotatable grooved disc and multiple pressure rollers;

[0014] The outer circumferential side of the tray is provided with a groove for accommodating the metal tube; the tray has a starting point and an ending point arranged circumferentially, and the groove located between the starting point and the ending point abuts against the metal tube.

[0015] Multiple pressure rollers are arranged sequentially around the periphery of the grooved plate, and the multiple pressure rollers roll into contact with the metal tube, pressing the metal tube into the groove.

[0016] Multiple pressure rollers include a first pressure roller group and a second pressure roller group located between the start and end points of the grooved plate. The first pressure roller group is closer to the start point of the grooved plate, and the second pressure roller group is closer to the end point of the grooved plate.

[0017] The pressing direction of the first pressure roller group forms a first angle with the normal direction of the starting point, and the pressing direction of the second pressure roller group forms a second angle with the normal direction of the ending point.

[0018] In some embodiments of this application, the sum of the first included angle and the second included angle is greater than or equal to 6 degrees and less than or equal to 12 degrees;

[0019] And / or, the first included angle is greater than or equal to 3 degrees and less than or equal to 6 degrees, and the second included angle is greater than or equal to 3 degrees and less than or equal to 6 degrees.

[0020] In some embodiments of this application, the groove has two sidewalls facing the outside of the groove, the two sidewalls being used to abut against the metal tube;

[0021] The angle between the two sidewalls is greater than or equal to 30 degrees and less than or equal to 54 degrees;

[0022] And / or, the inner surfaces of the two sidewalls are provided with a mesh pattern.

[0023] In some embodiments of this application, the feeding device includes multiple trays and a rotating frame, with the multiple trays arranged around the axis of the rotating frame; the trays are rotatably mounted on the rotating frame, and the axis of the trays is parallel to the axis of the rotating frame;

[0024] The feeding device includes a first driving component, which can drive the rotating frame to rotate.

[0025] In some embodiments of this application, the tray has a rotating shaft, and the rotating shaft is provided with a slot.

[0026] The feeding device also includes a second driving member, which is spaced apart from the first driving member; the second driving member is provided with a snap-fit ​​part, and the second driving member snaps into the snap-fit ​​part and the snap-fit ​​part.

[0027] In some embodiments of this application, the receiving device includes a base, a fourth driving member, a fifth driving member, a sixth driving member, a pusher plate, and a receiving tray;

[0028] The fourth driving component is located on the base and is rotatably connected to the receiving tray. The fourth driving component can drive the receiving tray to rotate relative to the base.

[0029] The fifth driving component is located on the base and is connected to the receiving tray. The fifth driving component can drive the receiving tray to move left and right relative to the base.

[0030] The sixth driving component is located on the base and is connected to the pusher plate. The pusher plate is located above the receiving tray and the sixth driving component can drive the pusher plate to move back and forth relative to the receiving tray.

[0031] Wherein, the front-back direction is the direction in which the metal tube enters the receiving device, and the front-back direction is perpendicular to the left-right direction.

[0032] In some embodiments of this application, the receiving device includes a seventh driving member, which is disposed on the base and connected to the receiving tray. The seventh driving member can drive the receiving tray to move in the height direction relative to the base.

[0033] In some embodiments of this application, the metal tube stretching device includes a bending device, which includes a plurality of guide rollers;

[0034] Multiple guide rollers are provided with adjustable gaps that can accommodate a metal tube, and the multiple guide rollers can bend the metal tube through the adjustable gaps.

[0035] In some embodiments of this application, the metal tube stretching device includes a stacking device;

[0036] The stacking device includes multiple dropping trays and a dropping frame, with the first ends of the multiple dropping trays in contact with each other and the second ends of the multiple dropping trays connected to the dropping frame;

[0037] Multiple material feeding trays are provided with notches at their first ends, and the multiple material feeding trays can move closer to each other or further away from each other to make the notches widen or close.

[0038] In some embodiments of this application, the metal tube stretching device includes a material transfer device;

[0039] The material transfer device includes a transfer tray and a support base, which are movably connected. The transfer tray can move the metal coil relative to the support base.

[0040] The transfer tray is equipped with guide posts perpendicular to the tray surface, and the metal coil can be fitted onto the transfer tray through the guide posts.

[0041] In some embodiments of this application, the metal tube stretching device includes a straightening device, which includes a plurality of first straightening rollers and a plurality of second straightening rollers;

[0042] Multiple first straightening rollers are arranged opposite each other and rotate in opposite directions. The opposite surfaces of the multiple first straightening rollers are provided with grooves for accommodating metal tubes. The relative rotation of the multiple first straightening rollers drives the metal tubes in the grooves to move.

[0043] Multiple second straightening rollers are arranged alternately at intervals, and the opposite surfaces of the multiple second straightening rollers are provided with grooves for accommodating metal tubes. The multiple second straightening rollers rotate relative to each other to straighten the metal tubes in the grooves.

[0044] The metal tube stretching device provided in this application includes: a feeding device, a stretching device, and a receiving device. The stretching device includes a rotatable grooved disc and multiple pressure rollers. A groove is provided on the outer peripheral side of the grooved disc. The grooved disc has a starting point and an ending point arranged circumferentially, and the groove located between the starting point and the ending point abuts against the metal tube. Multiple pressure rollers are sequentially arranged around the periphery of the grooved disc along its circumference, and the multiple pressure rollers roll into contact with the metal tube, pressing the metal tube into the groove. The multiple pressure rollers include a first pressure roller and a second pressure roller located between the starting point and the ending point of the grooved disc. The pressing direction of the first pressure roller forms a first angle with the normal direction of the starting point, which can ensure that the metal tube is subjected to the pressing force of the pressure roller, thereby maintaining its stability and shape accuracy. This can reduce the resistance when the metal tube enters the groove, allowing the metal tube to enter the groove more smoothly and be stretched, improving the efficiency of the stretching device. The pressing direction of the second pressure roller forms a second angle with the normal direction of the ending point, which can ensure that the metal tube is subjected to the pressing force of the pressure roller when it leaves the groove, thereby preventing the metal tube from deforming. Metal tubes can enter the next process more smoothly, thereby improving the efficiency of the stretching device.

[0045] Furthermore, the feeding device reduces feeding time and improves the processing efficiency of the stretching equipment by switching the positions of multiple material trays. The first pressure roller group forms a first angle with the normal direction of the starting point, and the second pressure roller group forms a second angle with the normal direction of the ending point. This prevents deformation of the metal tube when large tensile forces and speeds are applied, thereby improving the efficiency of the stretching device and enabling rapid stretching of large-tonnage pipes.

[0046] In addition to the technical problems solved by the embodiments of this application, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions as described above, other technical problems that this application can solve, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further explained in detail in the specific embodiments. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0048] Figure 1 is a structural schematic diagram of the metal tube stretching device provided in an embodiment of this application;

[0049] Figure 2 is a schematic diagram of the feeding device provided in an embodiment of this application;

[0050] Figure 3 is a top view of the straightening device provided in an embodiment of this application;

[0051] Figure 4 is a side view of the straightening device provided in an embodiment of this application;

[0052] Figure 5 is a schematic diagram of the tensile device provided in an embodiment of this application;

[0053] Figure 6 is a side view of the tensioning device provided in an embodiment of this application;

[0054] Figure 7 is a top view of the tensioning device provided in an embodiment of this application;

[0055] Figure 8 is a top view of the bending device provided in an embodiment of this application;

[0056] Figure 9 is a side view of the bending device provided in an embodiment of this application;

[0057] Figure 10 is a top view of the material receiving device provided in an embodiment of this application;

[0058] Figure 11 is a side view of the receiving device provided in an embodiment of this application;

[0059] Figure 12 is a top view of the stacking device provided in an embodiment of this application;

[0060] Figure 13 is a side view of the stacking device provided in an embodiment of this application;

[0061] Figure 14 is a top view of the material transfer device provided in an embodiment of this application;

[0062] Figure 15 is a side view of the material transfer device provided in an embodiment of this application.

[0063] Figure label:

[0064] 1-Metal tube stretching equipment;

[0065] 10-Discharge device;

[0066] 110-Pan; 120-Rotating frame; 130-First driving component; 140-Second driving component; 150-Third driving component; 111-Rotating shaft; 112-Limiting post; 141-Snap-fit ​​part; 1111-Slot part;

[0067] 20 - Straightening device;

[0068] 210 - First straightening roller; 220 - Second straightening roller; 230 - Roller groove; 240 - Servo motor;

[0069] 30 - Tensioning device;

[0070] 310-Groove; 320-Pressure roller; 330-Pliers arm; 340-Pressure roller bracket; 311-Groove; 321-First pressure roller group; 322-Second pressure roller group; 323-Third pressure roller group; 324-Fourth pressure roller group; k1-Start point; k2-End point; a1-First included angle; a2-Second included angle; b-Included angle between the two side walls;

[0071] 40 - Bending device;

[0072] 410 - Guide roller; 420 - Servo drive module; 430 - Drive motor; 440 - Hydraulic shears; 450 - Positioning sensor;

[0073] 50 - Receiving device;

[0074] 510 - Base; 520 - Fourth drive component; 530 - Fifth drive component; 540 - Sixth drive component; 550 - Pusher plate; 560 - Receiving tray; 570 - Seventh drive component; X - Front-back direction; Y - Left-right direction; Z - Height direction;

[0075] 60 - Stacking device;

[0076] 610 - Material unloading rack; 620 - Material unloading tray; 621 - Notch; 630 - Baffle; 640 - Lifting drive component;

[0077] 70 - Transfer device;

[0078] 710 - Support base; 720 - Transfer tray; 721 - Guide column;

[0079] 2-Metal pipe. Detailed Implementation

[0080] In related technologies, pipe stretching devices cannot achieve the stretching of large-tonnage, high-speed, and multi-size pipes. Their stretching efficiency is low, and the quality of the stretched metal pipe (e.g., avoiding deformation) and the stretching speed cannot be guaranteed at the same time.

[0081] To address the aforementioned problems, this application provides a metal tube stretching device, comprising: a feeding device, a stretching device, and a receiving device. The stretching device includes a rotatable grooved disc and multiple pressure rollers. A groove is provided on the outer peripheral side of the grooved disc. The grooved disc has a starting point and an ending point arranged circumferentially, and the groove located between the starting point and the ending point abuts against the metal tube. The multiple pressure rollers are sequentially arranged around the periphery of the grooved disc along its circumference, and the multiple pressure rollers roll into contact with the metal tube, pressing the metal tube into the groove. The multiple pressure rollers include a first pressure roller and a second pressure roller located between the starting point and the ending point of the grooved disc. The pressing direction of the first pressure roller forms a first angle with the normal direction of the starting point, ensuring that the metal tube is subjected to the pressing force of the pressure roller, thereby maintaining its stability and shape accuracy. This reduces the resistance when the metal tube enters the groove, allowing the metal tube to enter the groove more smoothly and be stretched, improving the efficiency of the stretching device. The pressing direction of the second pressure roller forms a second angle with the normal direction of the ending point, ensuring that the metal tube is subjected to the pressing force of the pressure roller when it leaves the groove, thereby preventing deformation of the metal tube. Metal tubes can enter the next process more smoothly, thereby improving the efficiency of the stretching device.

[0082] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0083] Referring to FIG1, this application embodiment provides a metal tube stretching device 1, which can change the shape and size of a metal tube 2 and improve the mechanical properties of the metal tube 2.

[0084] The metal tube stretching equipment 1 includes a feeding device 10, a straightening device 20, a stretching device 30, a bending device 40, a receiving device 50, a stacking device 60, and a transferring device 70 arranged sequentially. The metal tube raw material is released from the feeding device 10, which improves the production efficiency of the metal tube stretching equipment 1. The released metal tube raw material is straightened by the straightening device 20 to ensure the accuracy requirements of the metal tube 2. After straightening, the metal tube raw material enters the stretching device 30 for stretching. After passing through the stretching device 30, the metal tube enters the straightening device 20 for stress relief. The stress-relieved metal tube enters the bending device 40 for pre-bending, facilitating storage and transportation. The receiving device 50 receives the pre-bent metal tube, forming a metal coil. The stacking device 60 transfers the metal coil to the transferring device 70. Finally, a robotic arm lifts the metal coil out.

[0085] The following is a description of each device.

[0086] Referring to FIG2, the metal tube stretching equipment 1 includes a feeding device 10, which provides the metal tube 2 as raw material for the metal tube stretching equipment 1.

[0087] The feeding device 10 includes multiple trays 110 and a rotating frame 120. The rotating frame 120 is used to fix the trays 110, and the surface of the trays 110 is used to place the raw material of the metal tube 2. The trays 110 are rotatably mounted on the rotating frame 120 so that the raw material of the metal tube 2 on the trays 110 can be released as the trays 110 rotate.

[0088] Multiple trays 110 are arranged around the axis of the rotating frame 120, with the axis of the trays 110 parallel to the axis of the rotating frame 120, so that the multiple trays 110 can switch positions around the rotation axis of the rotating frame 120. In this way, the trays 110 can be rotated as needed to release the raw materials of the metal tubes 2 on different trays 110.

[0089] Furthermore, the feeding device 10 includes a first driving member 130. The first driving member 130 can drive the rotating frame 120 to rotate via a transmission assembly. For example, the first driving member 130 can be configured as a first motor, which is connected to the rotating frame 120 via a gear assembly to drive the rotating frame 120 to rotate.

[0090] While one of the multiple trays 110 is undergoing a stretching operation, the other trays 110 can perform preparatory work such as loading. Therefore, the first drive unit 130 drives the rotating frame 120 to rotate, causing the trays 110 to switch positions. This allows the tray 110 that has finished loading to switch to the position of the tray 110 containing the raw material from the metal tube 2 that has just been released, thereby reducing loading time and improving the processing efficiency of the stretching equipment.

[0091] Specifically, multiple trays 110 can be set to two trays 110, which can reduce the feeding time, meet the usage requirements, reduce the load on the rotating frame 120, reduce the failure rate of the rotating shaft of the rotating frame 120, and improve the reliability of the rotating frame 120.

[0092] The material tray 110 has a limiting post 112 perpendicular to the tray surface to prevent the raw material of the metal tube 2 from falling off the material tray 110 when the material tray 110 rotates.

[0093] The feeding device 10 also includes a second driving member 140. The second driving member 140 is disposed on the rotating frame 120 to keep the second driving member 140 stable. The second driving member 140 is disposed at a distance from the first driving member 130. That is, there is a certain distance between the second driving member 140 and the first driving member 130.

[0094] The second driving member 140 can drive the material tray 110 to rotate around its rotation axis 111. The second driving member 140 is provided with a snap-fit ​​part 141, and the rotation axis 111 is provided with a slot part 1111. By snapping the snap-fit ​​part 141 into the slot part 1111, the second driving member 140 is connected to the rotation axis 111 of the material tray 110, thereby driving the material tray 110 to rotate so that the material tray 110 can release the raw material from the metal tube 2.

[0095] For example, the second drive component 140 is configured as a second motor, and the output shaft of the second motor is provided with a coupling, which is provided with a snap-fit ​​part 141. By snapping the snap-fit ​​part 141 with the snap-fit ​​part 1111, the coupling of the second motor can be connected to the rotating shaft 111 of the material tray 110, thereby driving the material tray 110 to rotate so that the material tray 110 can release the raw material from the metal tube 2.

[0096] In some possible implementations, the feeding device 10 further includes a third driving member 150. The third driving member 150 is connected to the second driving member 140 and can drive the second driving member 140 to move toward the rotation axis 111 of the material tray 110, thereby realizing the engagement or disengagement of the engaging part 141 and the slot part 1111.

[0097] When the feeding device 10 needs to release the raw material of the metal tube 2, the third driving member 150 drives the second driving member 140 to move along the rotating shaft 111 of the material tray 110. The second driving member 140 is connected to the rotating shaft 111 of the material tray 110, thereby driving the material tray 110 to rotate so that the material tray 110 can release the raw material of the metal tube 2.

[0098] For example, the third drive component 150 is configured as the first cylinder, and the output shaft of the first cylinder is equipped with a floating joint. The floating joint is connected to the mounting base of the second drive component 140. The mounting base of the second drive component 140 is equipped with a guide rail, enabling it to move linearly relative to the rotating frame 120. The first cylinder drives the mounting base to move through the floating joint, thereby causing the second drive component 140 to move linearly along the rotation axis 111 of the material tray 110.

[0099] When the feeding device 10 does not require the second drive member 140 to drive the material tray 110 to rotate, the third drive member 150 drives the second drive member 140 to move away from the rotation axis 111 of the material tray 110, and the second drive member 140 is disengaged from the rotation axis 111 of the material tray 110. The raw material of the metal tube 2 can be subjected to the pulling force of the device in the next process of the feeding device 10 (e.g., the straightening device 20), causing the material tray 110 to rotate along its rotation axis 111 to meet the requirements of different processing techniques.

[0100] The following section describes the feeding process of a feeding device, taking an example of a feeding device with two material trays and active feeding.

[0101] First, the first material tray 110 discharges material, and the second material tray 110 loads material. Once the first material tray 110 has finished discharging material, the second material tray 110 has finished loading material.

[0102] Next, the third drive member 150 drives the second drive member 140 to move away from the rotation shaft 111 of the first tray 110, so that the second drive member 140 is disconnected from the rotation shaft 111 of the first tray 110.

[0103] Then, the first drive member 130 drives the rotating frame 120 to rotate, the first tray 110 rotates relative to the first drive member 130 to the original position of the second tray 110, and the second tray 110 rotates relative to the first drive member 130 to the original position of the first tray 110.

[0104] Finally, the third drive member 150 drives the second drive member 140 to move toward the rotation shaft 111 of the second tray 110. The second drive member 140 is connected to the rotation shaft 111 of the second tray 110, thereby driving the second tray 110 to rotate so that the tray 110 can release the raw material from the metal tube 2. While the second tray 110 is discharging material, the first tray 110 is loading material.

[0105] Referring to Figures 3 and 4, the metal tube stretching equipment 1 includes a straightening device 20, which can straighten the metal tube 2 or improve its mechanical properties. For example, the straightening device 20 can straighten the raw material of the metal tube 2 released by the feeding device 10 to ensure the accuracy requirements of the metal tube 2. The straightening device 20 can also straighten the metal tube 2 after it has been stretched by the metal tube stretching equipment 1 to eliminate residual stress in the stretched metal tube 2 and improve its mechanical properties.

[0106] The straightening device 20 includes a plurality of first straightening rollers 210. The plurality of first straightening rollers 210 are arranged opposite to each other, and the opposing first straightening rollers 210 rotate in opposite directions.

[0107] Multiple first straightening rollers 210 have roller grooves 230 on their opposite faces to accommodate the metal tube 2. The roller grooves 230 can limit the movement of the metal tube 2, ensuring that it does not deviate from the straightening track during the straightening process. The relative rotation of the multiple first straightening rollers 210 drives the metal tube 2 within the roller grooves 230 to move, providing traction force for the metal tube 2 to move through the straightening device 20.

[0108] The straightening device 20 includes a plurality of second straightening rollers 220. The plurality of second straightening rollers 220 are arranged alternately at intervals. The plurality of second straightening rollers 220 are arranged in two rows and alternately to avoid interference between adjacent second straightening rollers 220.

[0109] Multiple second straightening rollers 220 have roller grooves 230 on their opposite faces to accommodate the metal tube 2. The multiple second straightening rollers 220 rotate relative to each other, which can straighten the metal tube 2 within the roller grooves 230. The multiple second straightening rollers 220 allow the metal tube 2 to pass through multiple roller grooves 230, thereby improving the straightening effect.

[0110] In some possible implementations, a plurality of first straightening rollers 210 are arranged opposite each other, and the distance between the opposing first straightening rollers 210 can be adjusted to meet the straightening requirements of metal tubes 2 with different diameters.

[0111] Multiple second straightening rollers 220 are arranged in two rows, and the distance between the rows of second straightening rollers 220 can be adjusted to meet the straightening requirements of metal tubes 2 with different diameters.

[0112] For example, the straightening device 20 includes a servo motor 240 and a gearbox connected thereto. The servo motor 240 outputs power to rotate multiple first straightening rollers 210 and multiple second straightening rollers 220 through the gearbox, and the gearbox can realize the direction of rotation of multiple first straightening rollers 210 and multiple second straightening rollers 220.

[0113] It is easy to understand that multiple first straightening rollers 210 and multiple second straightening rollers 220 can be arranged as needed.

[0114] The following describes the straightening process performed by the straightening device.

[0115] First, the raw material in the released metal tube 2 passes through the roller grooves 230 of the first pair of first straightening rollers 210. The servo motor 240 outputs power through the gearbox, driving the first straightening rollers 210 to rotate relative to each other. The first straightening rollers 210 provide traction force to the metal tube 2. Then, the raw material in the metal tube 2 moves toward the roller grooves 230 between the multiple second straightening rollers 220, achieving straightening through the roller grooves 230, and moves toward the next process.

[0116] Referring to Figures 5 and 6, the metal tube stretching device 1 includes a stretching device 30. The stretching device 30 is used to stretch the metal tube 2, and changes the shape or size of the metal tube 2 by applying a stretching force.

[0117] The stretching device 30 includes a slotted plate 310. The slotted plate 310 is rotatably mounted on the stretching device 30. For example, the stretching device 30 includes a stretching motor, a transmission mechanism, and a transmission shaft. The stretching motor is connected to the transmission mechanism, and the transmission mechanism is connected to the slotted plate 310 via the transmission shaft. The stretching motor outputs power through the transmission mechanism, which is transmitted to the slotted plate 310 via the transmission shaft to cause the slotted plate 310 to rotate. The transmission shaft is provided with a limiting part, which can limit the movement of the slotted plate 310.

[0118] The outer peripheral side of the tray 310 is provided with a groove 311, which is used to accommodate the metal tube 2. The metal tube 2 is in contact with the inner surface of the groove 311, and the metal tube 2 is stretched into the required size and shape by the friction between the metal tube 2 and the groove 311.

[0119] For example, the groove 311 can be set as a V-groove. The V-groove allows the metal tube to enter the center of the groove, reducing the offset of the metal tube 2 and helping to improve the processing accuracy of the metal tube 2.

[0120] For example, the groove 311 can be configured as a trapezoidal groove, with the upper base of the trapezoid facing away from the groove opening. Trapezoidal grooves are simple to manufacture and have low cost, which helps reduce the processing cost of the grooved plate 310. The stretching device 30 includes multiple pressure rollers 320. Along the circumference of the grooved plate 310, the multiple pressure rollers 320 are sequentially arranged around the periphery of the grooved plate 310. The multiple pressure rollers 320 roll into contact with the metal tube 2 and press the metal tube 2 into the groove 311. The pressure rollers 320 apply pressure to press the metal tube 2 into the groove 311, ensuring that the metal tube 2 fits snugly against the groove 311 during the stretching process and preventing the metal tube 2 from coming out of the groove 311 during stretching. By having multiple pressure rollers 320 arranged circumferentially around the grooved plate 310, the multiple pressure rollers 320 can provide clamping force during the rotation of the grooved plate 310, avoiding instability during the stretching process of the metal tube 2.

[0121] In some possible implementations, the stretching device 30 includes a clamp arm 330 for pulling the metal tube 2 into the groove 311.

[0122] The tensioning device 30 may include a pressure roller bracket 340, on which a pair of pressure rollers 320 may be mounted to increase the clamping force of the pressure rollers 320. The pressure roller bracket 340 may also have three pressure rollers 320 mounted on it. This application does not limit the number of pressure rollers 320 on the pressure roller bracket 340. Multiple pressure rollers 320 on the pressure roller bracket 340 can form a pressure roller assembly.

[0123] In some possible implementations, the tensioning device 30 includes a hydraulic system. The pressure roller 320 is fixed to the pressure roller support 340.

[0124] The hydraulic system (not shown in the figure) includes a hydraulic pump, a hydraulic cylinder, and connected hydraulic lines. The hydraulic pump delivers hydraulic oil to the hydraulic cylinder through the hydraulic lines. The piston inside the hydraulic cylinder generates thrust under the action of the hydraulic oil. The piston inside the hydraulic cylinder is connected to a pressure roller bracket 340. The hydraulic cylinder forces the pressure roller 320 to press against the metal tube 2 via the pressure roller bracket 340. The hydraulic system can provide a large pressure output, allowing for the pressing of large-sized metal tubes 2. Furthermore, the smooth pressure transmission of the hydraulic system helps ensure uniform stress on the metal tube 2 during the stretching process.

[0125] The groove 310 has a starting point k1 and an ending point k2 arranged circumferentially, and the groove 311 located between the starting point k1 and the ending point k2 abuts against the metal tube 2. That is, the starting point k1 of the groove 310 is the contact position where the metal tube 2 enters the groove 311, and the ending point k2 of the groove 310 is the contact position where the metal tube 2 leaves the groove 311.

[0126] The multiple pressure rollers 320 include a first pressure roller group 321 located between the starting point k1 and the ending point k2 of the groove 310, with the first pressure roller group 321 close to the starting point k1 of the groove 310. During the stretching process of the metal tube 2, the metal tube 2 located at the starting point k1 within the groove 311 is in contact with the groove 311 and is easily deformed or displaced due to the stretching force. Therefore, by placing the first pressure roller group 321 within the groove 311 near the starting point k1, it can be ensured that the metal tube 2 is subjected to the clamping force of the pressure rollers 320, thereby maintaining its stability and shape accuracy.

[0127] The pressing direction of the first pressure roller group 321 forms a first angle α1 with the normal direction of the starting point k1. That is, the first pressure roller group 321 moves towards the rotation axis of the groove 310, pressing the metal tube 2 into the groove 311. The metal tube 2 enters the groove 311 of the groove 310 with the tangential direction of the starting point k1. At this time, the angle between the perpendicular direction of the tangent of the starting point k1 and the pressing direction of the first pressure roller group 321 is the first angle α1. If the pressing direction of the first pressure roller group 321 is completely coincident with the normal direction of the starting point k1, the pressure roller 320 that first contacts the metal tube 2 will cause the metal tube 2 to bend, resulting in increased resistance to the metal tube 2 entering the groove 311 and affecting the stretching efficiency of the metal tube 2.

[0128] It is easy to understand that when the metal tube 2 enters the starting point k1 position of the groove 311, it will be guided by the groove 311 and the pressure roller 320, thereby adjusting the direction of the metal tube 2, reducing the resistance when the metal tube 2 enters the groove 311, so that the metal tube 2 can enter the groove 311 more smoothly and be stretched, thereby improving the efficiency of the stretching device 30.

[0129] Similarly, the multiple pressure rollers 320 include a second pressure roller group 322 located between the starting point k1 and the ending point k2 of the groove 310, with the second pressure roller group 322 close to the ending point k2 of the groove 310. During the stretching process of the metal tube 2, the metal tube 2 located at the ending point k2 within the groove 311 will disengage from the groove 311. After the metal tube 2 disengages from the groove 311, it is without clamping force, and may deform, causing it to be inconsistent with the entry direction of the next process, thus affecting the efficiency of the stretching device 30. By placing the second pressure roller group 322 near the ending point k2, it can be ensured that the metal tube 2 is subjected to the clamping force of the pressure rollers 320 when it disengages from the groove 311, thereby preventing deformation of the metal tube 2.

[0130] The pressing direction of the second pressure roller assembly 322 forms a second angle α2 with the normal direction of the endpoint k2. That is, the second pressure roller assembly 322 moves towards the rotation axis of the grooved plate 310, pressing the metal tube 2 into the groove 311. The metal tube 2 disengages from the groove 311 of the grooved plate 310 along the tangent direction of the endpoint k2. At this time, the angle between the perpendicular direction of the tangent to the endpoint k2 and the direction of the applied pressing force of the second pressure roller assembly 322 is the second angle α2.

[0131] If the pressing direction of the second pressure roller group 322 is completely coincident with the normal direction of the endpoint k2, the pressure roller 320 that is the last to separate from the metal tube 2 will cause the metal tube 2 to bend, affecting the metal tube 2 from entering the next process (such as the straightening process).

[0132] In some possible implementations, in addition to the first pressure roller group 321 and the second pressure roller group 322, the multiple pressure rollers 320 may also be provided with other pressure rollers, and the number of other pressure rollers can be arranged according to actual needs.

[0133] In some possible implementations, the sum of the first included angle a1 and the second included angle a2 is greater than or equal to 6 degrees. If the sum of the included angles is too small, either the first included angle a1 or the second included angle a2 will be too small, causing the metal tube 2 to bend and affecting the efficiency of the stretching device 30.

[0134] The sum of the first included angle a1 and the second included angle a2 is less than or equal to 12 degrees. If the sum of the included angles is too large, either the first included angle a1 or the second included angle a2 will be too large, and the metal tube 2 will not have a clamping force in the groove 311, causing the metal tube 2 to deform and affecting the efficiency of the stretching device 30.

[0135] In some possible implementations, the first included angle a1 is greater than or equal to 3 degrees. If the first included angle a1 is too small, it will cause the metal tube 2 to bend, resulting in increased resistance as the metal tube 2 enters the groove 311, thus affecting the efficiency of the stretching device 30.

[0136] The first included angle a1 is less than or equal to 6 degrees. If the first included angle a1 is too large, when the metal tube 2 and the groove 311 begin to contact, no clamping force is applied to the metal tube 2, and the metal tube 2 may deform, thereby affecting the efficiency of the stretching device 30.

[0137] For example, the first included angle a1 can be a range of 3 degrees, 3.5 degrees, 4 degrees, 4.5 degrees, 5 degrees, 5.5 degrees, 6 degrees, or any two of them.

[0138] Similarly, the second included angle a2 is greater than or equal to 3 degrees. If the second included angle a2 is too small, the pressure roller 320 that is finally separated from the metal tube 2 will cause the metal tube 2 to bend, affecting the metal tube 2 from entering the next process (such as the straightening process), and thus affecting the efficiency of the stretching device 30.

[0139] The second included angle a2 is less than or equal to 6 degrees. If the second included angle a2 is too large, there will be no clamping force when the metal tube 2 leaves the groove 311, and the metal tube 2 may deform, causing the metal tube 2 to be inconsistent with the entry direction of the next process, which will affect the efficiency of the stretching device 30.

[0140] For example, the second included angle a2 can be a range of 3 degrees, 3.5 degrees, 4 degrees, 4.5 degrees, 5 degrees, 5.5 degrees, 6 degrees, or any two of them.

[0141] Referring to Figure 7, specifically, the stretching device 30 may include four pressure roller groups. Each pressure roller group includes two adjacent pressure rollers 320. The four pressure roller groups include a first pressure roller group 321, a fourth pressure roller group 324, a third pressure roller group 323, and a second pressure roller group 322. The first pressure roller group 321, the fourth pressure roller group 324, the third pressure roller group 323, and the second pressure roller group 322 are arranged sequentially along the circumference of the grooved plate 310 and located between the starting point k1 and the ending point k2 of the grooved plate 310. The first pressure roller group 321 is closer to the starting point k1 of the grooved plate 310, and the second pressure roller group 322 is closer to the ending point k2 of the grooved plate 310. The pressing direction of the fourth pressure roller group 324 is parallel to the direction in which the metal tube 2 enters the stretching device 30, and the pressing direction of the third pressure roller group 323 is perpendicular to the direction in which the metal tube 2 enters the stretching device 30. This design ensures that the metal tube 2 fits into the groove 311 of the slot 310 and prevents it from warping or deforming during stretching.

[0142] The groove 311 has two sidewalls facing outward from the groove 310, which abut against the metal tube 2. The two sidewalls are able to withstand the force exerted on the metal tube 2 during the stretching process and provide sufficient support to ensure that the metal tube 2 can maintain a stable position and orientation.

[0143] The included angle b between the two sidewalls is greater than or equal to 30 degrees. If the included angle is too small, the metal tube 2 that abuts against the two sidewalls will be too small and will not meet the requirements. In addition, if the included angle b between the two sidewalls is too small, it will easily cause the metal tube 2 to deform and have poor roundness.

[0144] The included angle b between the two sidewalls is less than or equal to 54 degrees. If the included angle is too large, the friction between the metal tube 2 and the two sidewalls will decrease, making it impossible to stretch the metal tube 2.

[0145] For example, the included angle b between the two sidewalls can be 30 degrees, 35 degrees, 40 degrees, 45 degrees, 50 degrees, 54 degrees, or any combination thereof.

[0146] The included angle b between the two sidewalls, the clamping force of the pressure roller 320, and the number of pressure rollers 320 can be set by calculation and production needs, thereby ensuring the quality of the metal tube 2 while achieving rapid stretching of the metal tube 2 at large tonnage.

[0147] For example, the metal tube 2 has a diameter of 30 mm, the included angle b between the two side walls can be set to 42 degrees, and four pairs of pressure rollers 320 are used to press the metal tube 2, with the hydraulic system exerting a pressing force of 400 kgf on the pressure rollers 320.

[0148] The inner surfaces of the two sidewalls are provided with a mesh pattern. By providing interwoven lines or patterns on the inner surfaces of the sidewalls, the roughness of the inner surfaces of the two sidewalls can be increased, thereby increasing the friction between the groove 311 and the metal tube 2. With this configuration, the groove 311 can hold a larger metal tube 2, thereby increasing the size of the metal tube 2 that the stretching device 30 can accommodate, so as to achieve the stretching of large-size metal tubes 2.

[0149] Furthermore, through the hydraulic system and the coordinated design of the large included angle b between the two side walls, the hydraulic system can provide a large and stable pressure output, enabling the stretching device 30 to clamp the large-sized metal tube 2. Simultaneously, the stretching device 30 achieves rapid stretching, thereby improving stretching efficiency.

[0150] In some possible implementations, the feeding device 10 switches positions via multiple feed trays 110, thereby reducing feeding time and improving the processing efficiency of the stretching equipment. The first pressure roller group 321 forms a first angle α1 with the normal direction of the starting point k1, and the second pressure roller group 322 forms a second angle α2 with the normal direction of the ending point k2. This prevents deformation of the metal tube 2 when large stretching forces and speeds are applied, thereby improving the efficiency of the stretching device 30. An angle b between the two sidewalls is greater than or equal to 30 degrees, ensuring that metal tubes 2 with larger diameters can be stretched.

[0151] The stretching process of the stretching device is described below.

[0152] First, before the metal tube 2 enters the stretching device 30, the third drive member drives the second drive member 140 to move away from the rotating shaft 111 of the first tray 110, so that the second drive member 140 is disconnected from the rotating shaft 111 of the first tray 110.

[0153] Next, clamp arm 330 pulls the metal tube 2 into the groove 311 of the tray 310. The metal tube 2 winds around the groove 311 of the tray 310 by 270 degrees. As the metal tube 2 winds around the tray 310, four pairs of pressure rollers 320 press the metal tube 2 into the groove 311 in sequence at preset angles. The first pressure roller group 321 has a 5-degree angle with the normal to the starting point k1. The fourth pressure roller group 324 and the third pressure roller group 323 are evenly distributed between the starting point k1 and the ending point k2. The second pressure roller group 322 has a 5-degree angle with the normal to the ending point k2, ensuring that the metal tube 2 is in full circumferential contact with the tray 310.

[0154] Finally, the hydraulic system applies a stable clamping force to the four pairs of pressure rollers 320. The grooved disc 310 is driven to rotate, completing the stretching of the metal tube 2.

[0155] Referring to Figures 8 and 9, the metal tube stretching device 1 includes a bending device 40. The bending device 40 can bend the metal tube 2 to facilitate subsequent winding.

[0156] The bending device 40 includes multiple guide rollers 410. A gap is provided to accommodate the metal tube 2, and this gap allows the metal tube 2 to be bent. The multiple guide rollers 410 are provided with an adjustable gap, which can be adjusted to change the bending radius of the metal tube 2. The multiple guide rollers 410 can bend the metal tube 2 to the desired radius through the adjustable gap.

[0157] For example, the bending device 40 includes a servo drive module 420 and a gear mechanism. The servo drive module 420 drives the guide rollers 410 to move via the gear mechanism, thereby adjusting the gap between the guide rollers 410 to form a smooth transition bend in the metal tube 2. The bending device 40 also includes a drive motor 430, which drives the guide rollers 410 to rotate via the gear mechanism to pull the metal tube 2 to the next process.

[0158] In some possible implementations, the bending device 40 includes a shearing mechanism. The shearing mechanism includes a hydraulic shear 440 and a positioning sensor 450. The positioning sensor 450 can identify the position where the metal tube 2 is being sheared, and the hydraulic shear 440 can shear the metal tube 2.

[0159] The bending process of the bending device is described below.

[0160] First, after the metal tube 2 enters the bending device 40, the metal tube 2 enters the gap between the guide rollers 410.

[0161] Next, the drive motor 430 drives the guide roller 410 to rotate via a gear mechanism, thereby pulling the metal tube 2 toward the next process. At the same time, the servo drive module 420 drives the guide roller 410 to move via a gear mechanism, thereby adjusting the gap between the guide rollers 410 so that the metal tube 2 bends according to a predetermined radius.

[0162] Finally, based on actual needs, the positioning sensor 450 identifies the cutting position of the metal tube 2, and the hydraulic shears 440 can cut the metal tube 2.

[0163] Referring to Figures 10 and 11, the metal tube stretching apparatus 1 includes a take-up device 50. The take-up device 50 is used to receive and wind up the bent metal tube 2.

[0164] The receiving device 50 includes a base 510, a fourth driving member 520, a fifth driving member 530, a sixth driving member 540, and a receiving tray 560. The fourth driving member 520, the fifth driving member 530, and the sixth driving member 540 are respectively disposed on the base 510. The base 510 is a supporting component of the receiving device 50. The receiving tray 560 is a component in the receiving device 50 that receives and supports bent metal tubes.

[0165] The fourth drive unit 520 is rotatably connected to the take-up tray 560, and the fourth drive unit 520 can drive the take-up tray 560 to rotate relative to the base 510. The take-up tray 560 rotates under the drive of the fourth drive unit 520, and the rotation speed of the take-up tray 560 is set according to the linear velocity of the metal tube 2 in contact with the take-up tray 560.

[0166] For example, the fourth drive unit 520 is configured as a third motor, which is rotatably connected to the receiving tray 560 via a coupling. The fourth drive unit 520 can drive the receiving tray 560 to rotate relative to the base 510.

[0167] For ease of explanation, the direction in which the metal tube 2 enters the receiving device 50 is defined as the front-to-back direction X, and the direction perpendicular to the front-to-back direction is defined as the left-to-right direction Y.

[0168] The take-up device 50 is used to wind up the bent metal tube 2. Depending on the requirements, the take-up device 50 can wind the metal tube 2 into different shapes, such as metal coils (like mosquito coils).

[0169] This explanation uses a mosquito coil made of metal as an example. The bent metal tube 2 enters the receiving device 50 along the front-rear direction X and contacts the receiving tray 560. The contact position between the metal tube 2 and the receiving tray 560 is fixed after entering the receiving device 50. However, the bending radius of the metal tube 2 changes to form a mosquito coil. A fifth driving component 530 is connected to the receiving tray 560, and the fifth driving component 530 can drive the receiving tray 560 to move in the left-right direction Y relative to the base 510. By driving the receiving tray 560 to move in the left-right direction Y relative to the base 510, the bending radius of the metal coil can be changed, thus obtaining a mosquito coil.

[0170] For example, the fifth drive unit 530 is configured as a transverse motor, which can drive the take-up tray 560 to move linearly. The transverse motor drives the ball screw to move the take-up tray 560 in the vertical direction of the metal tube 2 entering the tray. That is, the take-up tray 560 moves in the left-right Y direction relative to the base 510, which can collect the metal tube that has passed through the bending device 40.

[0171] The sixth driving component 540 is connected to the pusher plate 550, which is positioned above the take-up tray 560. The sixth driving component 540 can drive the pusher plate 550 to move in the X-direction relative to the take-up tray 560. This allows the final metal coil to be pushed out and proceed to the next process.

[0172] For example, the sixth driving component 540 is configured as a second cylinder. The second cylinder drives the pusher plate 550 of the receiving device 50 to move in the X direction via a connecting rod structure, so as to push out the metal coil or push back the pusher plate 550 after the metal coil is pushed out.

[0173] In some possible implementations, the receiving device 50 includes a frame mounted on a base 510, and a fifth drive member 530 mounted on the base 510. The fifth drive member 530 drives the frame to move in the left-right direction (Y). A fourth drive member 520, a sixth drive member 540, and components such as a material tray are mounted on the frame. That is, the fifth drive member 530 drives the frame to move in the left-right direction (Y), and the fourth drive member 520, the sixth drive member 540, and components such as the material tray move along with the frame in the left-right direction (Y). Simultaneously, the fourth drive member 520 drives the receiving tray 560 to rotate. The sixth drive member 540 can drive the pusher plate 550 to move in the front-back direction (X) relative to the receiving tray 560. This arrangement enables multiple actions to work together, improving receiving efficiency.

[0174] The receiving device 50 includes a seventh drive member 570, which is disposed on the base 510. The seventh drive member 570 is connected to the receiving tray 560 and can drive the receiving tray 560 to move in the height direction Z relative to the base 510, so as to realize multi-layer receiving of metal coils and facilitate the transportation of metal coils.

[0175] For example, the seventh drive unit 570 is configured as a lifting motor, which can drive the receiving tray 560 to move along the height direction Z. The lifting motor drives the receiving tray 560 to move along the height direction Z through the lifting mechanism of the receiving device 50. After the metal coil completes one layer of material collection, the distance by which the receiving tray 560 descends one layer along the height direction Z is reduced to the minimum.

[0176] In some possible implementations, the seventh drive member 570 is mounted on the frame, and its lifting or lowering can drive the fourth drive member 520 and the receiving tray 560 to lift or lower. Simultaneously, this does not affect the fourth drive member 520's ability to rotate the receiving tray 560. This arrangement achieves coordinated operation and improves material collection efficiency.

[0177] The following section uses mosquito coil tubing as an example to describe the material collection process after the metal tubing enters the material collection device.

[0178] After the metal tube 2 enters the receiving device 50, the fourth driving component 520 drives the receiving tray 560 to rotate relative to the base 510, so that the linear velocity of the metal tube 2 entering the receiving device 50 is the same as the stretching velocity. At the same time, the fifth driving component 530 can drive the receiving tray 560 to move in the left-right Y direction relative to the base 510 to obtain the mosquito coil tube.

[0179] Then, the seventh drive unit 570 drives the receiving tray 560 to move in the height direction Z relative to the base 510 to achieve multi-layer receiving of mosquito coil tubes.

[0180] Finally, the sixth drive unit 540 drives the pusher plate 550 to move back and forth relative to the receiving tray 560, pushing out the multi-layer mosquito coil tube so that it can reach the next process.

[0181] Referring to Figures 12 and 13, the metal tube stretching device 1 includes a stacking device 60. The stacking device 60 can stack multiple metal coils together for easy transport.

[0182] The stacking device 60 includes multiple drop trays 620 and drop racks 610. The drop trays 620 are used to place the metal tubes 2. The drop racks 610 are used to support the drop trays 620 and other parts of the stacking device 60.

[0183] The first ends of the multiple drop trays 620 are in contact with each other to prevent the metal tubes 2 from slipping during stacking. The second ends of the multiple drop trays 620 are connected to the drop rack 610, which provides support for the drop trays 620 to ensure the stability and reliability of the stacking device 60.

[0184] Multiple material drop trays 620 are provided with notches 621 at their first ends. The multiple material drop trays 620 can move closer to each other or further away from each other to make the notches 621 expand or close, so that the metal coils can be stacked and then fall.

[0185] For example, the stacking device 60 includes two dropping trays 620, which are symmetrically arranged on the dropping frame 610. The stacking device 60 includes a third cylinder, which drives the two dropping trays 620 to move in opposite directions, thereby widening the notch 621. The metal coil falls from the widened notch 621 to the next process.

[0186] The stacking device 60 includes a lifting drive 640. The lifting drive 640 can drive the dropping tray 620 to descend via a transmission mechanism, so that the metal coil can reach the next process. The lifting drive 640 can also drive the dropping tray 620 to rise via a transmission mechanism, so that the dropping tray 620 descends and then rises again to return to its original position.

[0187] In some possible implementations, the stacking device 60 includes a baffle 630 disposed around a plurality of drop trays 620. The baffle 630 can guide the metal tube 2 into a predetermined area of ​​the stacking device 60. The baffle 630 is provided with an inlet facing the direction of the previous process of the stacking device 60, through which the metal tube 2 enters the predetermined area formed by the baffle 630 surrounding the plurality of drop trays 620.

[0188] The following describes the stacking process after the metal tubes enter the stacking device.

[0189] First, after the pusher plate 550 pushes out the metal coil, the metal tube 2 is guided into the stacking device 60 by the baffle 630, waiting for the stacking to reach the required level. The lifting drive 640 drives the dropping plate 620 to descend, so that the metal coil descends to the target position.

[0190] Next, the third cylinder drives the two dropping discs 620 to move in opposite directions, widening the gap 621. The metal coil falls from the widened gap 621 to the next process.

[0191] Then, the third cylinder drives the two dropping discs 620 to move towards each other, reducing the gap 621 and preventing the metal coil from falling from the gap 621.

[0192] Finally, the lifting drive 640 drives the material drop plate 620 to rise and return to its original position (such as being flush with the material collection plate 560 of the material collection device 50), waiting for the next material stacking.

[0193] Referring to Figures 14 and 15, the metal tube stretching device 1 includes a material transfer device 70. The material transfer device 70 can move the metal tube 2 to a different position to facilitate the transfer of the metal tube 2.

[0194] The material transfer device 70 includes a material transfer tray 720 and a support base 710. The material transfer tray 720 is disposed on the support base 710, and the material transfer tray 720 can drive the metal coil to move relative to the support base 710, thereby realizing the transfer of the metal tube 2.

[0195] The transfer tray 720 is provided with guide posts 721 perpendicular to the tray surface, and the metal tube can be fitted onto the transfer tray 720 through the guide posts 721. When the transfer tray 720 moves, the guide posts 721 keep the metal tube 2 stably on the transfer tray 720, preventing it from slipping or moving.

[0196] For example, the material transfer device 70 includes a material transfer cylinder, a first material transfer tray, and a second material transfer tray. The first material transfer tray and the second material transfer tray are sequentially disposed on the support base 710. The first material transfer tray receives the metal coil of the stacking device 60 and moves to the position of the second material transfer tray by the action of the material transfer cylinder. The second material transfer tray moves to the position where the metal coil is transferred to the next process.

[0197] The following describes the material transfer process after the metal tube enters the material transfer device.

[0198] First, a first transfer tray is located directly below the notch 621. The metal coil falling from the notch 621 is fitted onto the guide post 721 of this transfer tray 720.

[0199] Then, the transfer cylinder drives all the transfer trays 720 to move, and the second transfer tray moves to the position of the first transfer tray, ready to transfer the next falling metal coil.

[0200] At the same time, the metal coil on the first transfer tray is lifted out by a robotic arm (such as a transplanter).

[0201] Compared to traditional V-type stretching equipment with a stretching force of less than 1 ton, the metal tube stretching equipment of this application can achieve a stretching force of ≥4 tons, a speed of ≥270m / min, and a tube diameter covering φ10-φ50mm. It is particularly suitable for drawing copper tubes with a diameter of φ15mm and above, with wide applicability and significantly improved production efficiency.

[0202] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0203] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0204] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A metal tube stretching device, characterized in that, include: The device comprises a feeding device (10), a stretching device (30), and a taking-up device (50). The feeding device (10) is used to release the raw material of the metal tube (2), and the taking-up device (50) is used to wind the finished metal tube (2) to obtain a metal coil. The stretching device (30) includes a rotatable grooved plate (310) and a plurality of pressure rollers (320). The outer peripheral side of the grooved plate (310) is provided with a groove (311) for accommodating the metal tube (2). The grooved plate (310) has a starting point (k1) and an ending point (k2) arranged circumferentially, and the groove (311) located between the starting point (k1) and the ending point (k2) abuts against the metal tube (2). The plurality of pressure rollers (320) are arranged sequentially along the circumference of the grooved plate (310). Around the periphery of the groove (310), a plurality of pressure rollers (320) roll in contact with the metal tube (2), pressing the metal tube (2) into the groove (311); the plurality of pressure rollers (320) include a first pressure roller group (321) and a second pressure roller group (322) located between the starting point (k1) and the ending point (k2) of the groove (310), the first pressure roller group (321) is close to the starting point (k1) of the groove (310), and the second pressure roller group (322) is close to the ending point (k2) of the groove (310); the pressing direction of the first pressure roller group (321) forms a first angle (a1) with the normal direction of the starting point (k1), and the pressing direction of the second pressure roller group (322) forms a second angle (a2) with the normal direction of the ending point (k2).

2. The metal tube stretching device according to claim 1, characterized in that, The sum of the first included angle (a1) and the second included angle (a2) is greater than or equal to 6 degrees and less than or equal to 12 degrees; and / or, the first included angle (a1) is greater than or equal to 3 degrees and less than or equal to 6 degrees, and the second included angle (a2) is greater than or equal to 3 degrees and less than or equal to 6 degrees.

3. The metal tube stretching device according to claim 1, characterized in that, The groove (311) has two sidewalls facing the outside of the groove (310), the two sidewalls being used to abut against the metal tube (2); the included angle of the two sidewalls is greater than or equal to 30 degrees and less than or equal to 54 degrees; and / or, the inner surface of the two sidewalls is provided with a mesh pattern.

4. The metal tube stretching device according to any one of claims 1-3, characterized in that, The feeding device (10) includes a plurality of trays (110) and a rotating frame (120), wherein the plurality of trays (110) are arranged around the axis of the rotating frame (120); the trays (110) are rotatably disposed on the rotating frame (120), and the axis of the trays (110) is parallel to the axis of the rotating frame (120); the feeding device (10) includes a first driving member (130), which can drive the rotating frame (120) to rotate.

5. The metal tube stretching device according to claim 4, characterized in that, The material tray (110) has a rotating shaft (111), and the rotating shaft (111) is provided with a slot (1111); the feeding device (10) further includes a second driving member (140), which is spaced apart from the first driving member (130); the second driving member (140) is provided with a snap-fit ​​part (141), and the second driving member (140) snaps into the slot (1111) through the snap-fit ​​part (141).

6. The metal tube stretching device according to any one of claims 1-3, characterized in that, The receiving device (50) includes a base (510), a fourth driving member (520), a fifth driving member (530), a sixth driving member (540), a pusher plate (550), and a receiving tray (560); the fourth driving member (520) is disposed on the base (510) and rotatably connected to the receiving tray (560), and the fourth driving member (520) drives the receiving tray (560) to rotate relative to the base (510); the fifth driving member (530) is disposed on the base (510) and connected to the receiving tray (560), and the... The fifth driving member (530) drives the receiving tray (560) to move in the left-right direction relative to the base (510); the sixth driving member (540) is disposed on the base (510), the sixth driving member (540) is connected to the pusher plate (550), the pusher plate (550) is disposed above the receiving tray (560), and the sixth driving member (540) drives the pusher plate (550) to move in the front-back direction relative to the receiving tray (560); wherein, the front-back direction is the direction in which the metal tube (2) enters the receiving device (50), and the front-back direction is perpendicular to the left-right direction.

7. The metal tube stretching device according to claim 6, characterized in that, The receiving device (50) includes a seventh driving member (570), which is disposed on the base (510) and connected to the receiving tray (560). The seventh driving member (570) can drive the receiving tray (560) to move in the height direction relative to the base (510).

8. The metal tube stretching device according to any one of claims 1-3, characterized in that, The metal tube stretching device (1) includes a bending device (40), which includes a plurality of guide rollers (410); the plurality of guide rollers (410) are provided with an adjustable gap, the gap being used to accommodate the metal tube (2), and the plurality of guide rollers (410) bend the metal tube (2) through the gap.

9. The metal tube stretching device according to claim 8, characterized in that, The metal tube stretching equipment includes a stacking device (60); the stacking device (60) includes a plurality of dropping trays (620) and a dropping rack (610), the first ends of the plurality of dropping trays (620) are in contact with each other, and the second ends of the plurality of dropping trays (620) are connected to the dropping rack (610); the first ends of the plurality of dropping trays (620) are respectively provided with notches (621), and the plurality of dropping trays (620) can move closer to each other or further away from each other so that the notches (621) expand or close.

10. The metal tube stretching device according to claim 9, characterized in that, The metal tube stretching equipment (1) includes a material transfer device (70); the material transfer device (70) includes a material transfer plate (720) and a support base (710), the material transfer plate (720) and the support base (710) are movably connected, the material transfer plate (720) can drive the metal coil to move relative to the support base (710); the material transfer plate (720) is provided with a guide post (721) perpendicular to the plate surface of the material transfer plate (720), the material transfer plate (720) can sleeve the metal coil through the guide post (721).

11. The metal tube stretching device according to claim 1, characterized in that, The metal tube stretching device (1) includes a straightening device (20), which includes a plurality of first straightening rollers (210) and a plurality of second straightening rollers (220). The plurality of first straightening rollers (210) are arranged opposite to each other and rotate in opposite directions. The opposing surfaces of the plurality of first straightening rollers (210) are provided with roller grooves (230) for accommodating metal tubes (2). The relative rotation of the plurality of first straightening rollers (210) drives the metal tubes (2) in the roller grooves (230) to move. The plurality of second straightening rollers (220) are arranged alternately at intervals. The opposing surfaces of the plurality of second straightening rollers (220) are provided with roller grooves (230) for accommodating metal tubes (2). The relative rotation of the plurality of second straightening rollers (220) straightens the metal tubes (2) in the roller grooves (230).

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