U-shaped pipe bending machine

Abstract

The utility model discloses a U-shaped pipe bending machine which comprises a bending die provided with a first containing groove, and the first containing groove comprises a first bending part, a linear part and a second bending part which are sequentially connected from bottom to top. And the bending mechanism comprises a lifting device and a turnover device, the lifting device comprises a lifting frame movably installed on the rack, the turnover device comprises a rotating frame rotationally installed on the lifting frame, a forming plate is installed on the rotating frame, and a second containing groove is formed in the upper surface of the forming plate. During bending, a rotating shaft of a rotating frame and the axis of a first bending part are coaxially arranged, at the moment, a forming plate is driven by the rotating frame to turn over upwards, then a turnover device is driven by a lifting plate to move upwards, so that the rotating shaft of the rotating frame and the axis of a second bending part are coaxially arranged, and at the moment, the forming plate is driven by the rotating frame to turn over backwards; therefore, the U-shaped pipe with the linear middle section can be quickly machined at the same station, and the machining efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of pipe bending, in particular to a U-tube bending machine. Background Art

[0002] The existing U-shaped pipe bending machine can generally only bend a straight pipe into a U-shaped pipe 100 with a circular arc in the middle section. Figure 1 As shown, however, the U-shaped tube 200 with a straight middle section cannot be processed usually. Figure 2 As shown, the U-shaped tube 200 with a straight middle section includes a first straight tube section 210, a second straight tube section 220, and a middle straight tube section 230 located between the first straight tube section 210 and the second straight tube section 220. A first curved tube section 240 is provided between the middle straight tube section 230 and the first straight tube section 210, and a second curved tube section 250 is provided between the middle straight tube section 230 and the second straight tube section 220. Therefore, this type of U-shaped tube usually needs to be provided with two bending stations on the tube bending machine, firstly, the first curved tube section 240 is processed and bent at the first bending station, and then the pipe is transferred to the second bending station by a transfer mechanism to process the second curved tube section 250. This bending method requires transferring the pipe to two bending stations for bending processing to form the first curved tube section 240 and the second curved tube section 250, which is very inconvenient, and the transfer process increases the processing time of the pipe, resulting in low processing efficiency of the pipe. In addition, the provision of the transfer mechanism not only increases the overall volume of the pipe bending machine, but also increases the production cost of the pipe bending machine. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a U-shaped pipe bending machine, which can conveniently process pipe fittings into U-shaped pipes with a straight middle section and has high processing efficiency.

[0004] According to the U-shaped pipe bending machine of the embodiment of the utility model, it includes: a frame; a clamping mechanism installed on the frame, the clamping mechanism is used to clamp the pipe fitting; a bending mold installed on the frame and located on the front side of the clamping mechanism, the bending mold has a first accommodating groove, the first accommodating groove includes a first bending portion, a straight portion and a second bending portion connected in sequence from bottom to top, the first bending portion and the second bending portion are both bent toward the rear side of the straight portion; the bending mechanism includes a lifting device and a flipping device, the lifting device includes a lifting frame movably installed on the frame, the lifting frame is located on one side of the bending mold and can reciprocate in the up and down directions, and the flipping device includes a lifting frame rotatably installed on the lifting frame The rotating frame of the frame is provided with a forming plate, the forming plate is located at the front side of the bending mold and extends to the lower side of the first bending part, and the upper surface of the forming plate is provided with a second accommodating groove corresponding to the first accommodating groove; wherein, when the rotating axis of the rotating frame is coaxially arranged with the axis of the first bending part, the rotating frame can drive the forming plate and drive the pipe to flip upward from the lower side of the first bending part, so that the pipe flips upward to partially embed in the straight line part; when the rotating axis of the rotating frame is coaxially arranged with the axis of the second bending part, the rotating frame can drive the forming plate and drive the pipe to flip backward from the front side of the straight line part, so that the pipe flips backward to partially embed in the second bending part.

[0005] The U-shaped pipe bender according to the embodiment of the utility model has at least the following beneficial effects:

[0006] By setting the bending mechanism as a lifting device and a flipping device, when bending, the pipe is extended into the first bending part and placed in the second receiving groove, and the pipe is clamped and fixed by the clamping device. The rotating shaft of the rotating frame in the flipping device is first arranged coaxially with the axis of the first bending part. At this time, the rotating frame drives the forming plate to flip upward from the lower side of the first bending part, and the pipe is flipped upward around the axis of the first bending part to the straight part partially embedded in the first receiving groove, thereby bending the first curved pipe part and the middle straight section, and then the lifting plate of the lifting device drives the flipping device to move upward, so that the rotating shaft of the rotating frame is arranged coaxially with the axis of the second bending part, and the rotating frame drives the forming plate to flip backward from the front side of the straight section, and the pipe is flipped backward to the second bending section partially embedded in the first receiving groove, thereby bending the second curved pipe part at the upper end of the middle straight section. The entire processing process is completed at the same workstation, and the lifting device and the flipping device cooperate with each other to quickly process a U-shaped pipe with a straight middle section, which has high processing efficiency.

[0007] According to some embodiments of the utility model, a core shaft capable of inserting a pipe fitting is installed in the second accommodating groove; the rotating frame has a support plate, the forming plate is movably installed on the support plate, the second accommodating groove is arranged along the length direction of the support plate, and a second linear drive device connected to the forming plate for transmission is installed on the support plate, the second linear drive device can drive the forming plate and drive the core shaft to reciprocate along the length direction of the support plate.

[0008] According to some embodiments of the present invention, the rear end of the core shaft has a spherical portion.

[0009] According to some embodiments of the present invention, it also includes a control system, the lifting frame is equipped with a first rotation drive device and an angle detection device electrically connected to the control system, the first rotation drive device is transmission-connected to the rotating frame and can drive the rotating frame to rotate relative to the lifting frame, the angle detection device can detect the rotation angle of the rotating frame, and the control system can control whether the first rotation drive device works or not according to the angle information fed back by the angle detection device.

[0010] According to some embodiments of the utility model, a cutting mechanism is also included, which includes a cutting bracket installed on the frame, a movable plate movably installed on the cutting bracket, a second rotary drive device and a cutting tool transmission-connected to the second rotary drive device are installed on the movable plate, and in the front-to-back direction, the cutting tool is located on the rear side of the bending mold, and the movable plate can drive the cutting tool to move in a direction perpendicular to the front-to-back direction.

[0011] According to some embodiments of the utility model, the frame is also provided with a discharge device, and the discharge device is provided with a discharge chute which is at least partially located below the bending mold, and the bottom wall of the discharge chute is arranged to be inclined outward from top to bottom and extends to the outside of the bracket.

[0012] According to some embodiments of the utility model, the frame is also provided with a pushing device located at the rear side of the bending mold, the pushing device includes a pushing rod movably installed on the frame, the pushing rod is arranged along the front-to-back direction, and the frame is installed with a third linear drive device transmission connected to the pushing rod, the third linear drive device can drive the pushing rod to move along the front-to-back direction and make the pushing rod extend into the second bending pipe portion of the pipe fitting.

[0013] According to some embodiments of the utility model, the bracket is installed with a guide plate located between the third linear drive device and the bending mold, the guide plate is provided with a guide hole adapted to the push rod, and the push rod is movably inserted into the guide hole.

[0014] According to some embodiments of the utility model, the number of the first accommodating grooves provided on the bending mold is at least two, all of the first accommodating grooves are arranged at intervals along the left-right direction, and the second accommodating grooves opened on the forming plate correspond one-to-one to all of the first accommodating grooves.

[0015] According to some embodiments of the utility model, the number of the bending molds is at least two, and each of the bending molds can be detachably installed on the frame; among two of the bending molds, the length of the straight line portion of one is greater than the length of the other straight line portion, and / or the bending radius of one of the first bending portions is greater than the bending radius of the other first bending portion, and / or the bending radius of one of the second bending portions is greater than the bending radius of the other second bending portion.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 It is a schematic diagram of a common U-shaped tube;

[0019] Figure 2 is a schematic diagram of a U-shaped tube with a straight tube section in the middle;

[0020] Figure 3 A schematic diagram of a U-shaped pipe bending machine according to an embodiment of the present utility model;

[0021] Figure 4 Another schematic diagram of a U-shaped pipe bender according to an embodiment of the present utility model;

[0022] Figure 5 A schematic diagram of a bending mold according to an embodiment of the present utility model;

[0023] Figure 6 A schematic diagram of a bending mold according to another embodiment of the present invention;

[0024] Figure 7 A schematic diagram of a bending mechanism and a bending mold according to an embodiment of the utility model;

[0025] Figure 8 It is a schematic diagram of a rotating device and a bending mold according to an embodiment of the utility model;

[0026] Fig. 9 This is a schematic diagram of a forming plate of an embodiment of the utility model being located at the lower side of a bending mold;

[0027] Fig.10 It is a schematic diagram of a forming plate according to an embodiment of the utility model being turned upward to the front side of a bending mold;

[0028] Fig.11 It is a schematic diagram of the forming plate of the embodiment of the utility model being flipped backward to the upper side of the bending mold;

[0029] Fig.12 A schematic diagram of a flipping device according to an embodiment of the utility model;

[0030] Fig.13 A schematic diagram of a lifting device according to an embodiment of the utility model;

[0031] Fig.14 A schematic diagram of a cutting mechanism according to an embodiment of the present utility model;

[0032] Fig.15 A schematic diagram of a discharging device according to an embodiment of the utility model;

[0033] Fig.16 A schematic diagram of a cross section of a discharging device according to an embodiment of the utility model;

[0034] Fig.17 A schematic diagram of a material ejection device according to an embodiment of the utility model;

[0035] Fig.18 It is a cross-sectional schematic diagram of the lifting device according to an embodiment of the utility model.

[0036] Reference numerals:

[0037] The middle section is a U-shaped tube 100 with an arc shape;

[0038] The middle section is a straight U-shaped tube 200, a first straight tube section 210, a second straight tube section 220, a middle straight tube section 230, a first curved tube section 240, and a second curved tube section 250;

[0039] The frame 300, the clamping mechanism 310, the first clamping portion 311, the second clamping portion 312, the clamping groove 313, the fourth linear drive device 314, the straightening mechanism 320, and the guide mechanism 330;

[0040] Bending mold 400, first containing groove 410, first bending portion 411, straight portion 412, second bending portion 413;

[0041] A lifting device 500, a lifting frame 510, a first slide rail 511, a first slide block 512, a first rotation drive device 520, and a first linear drive device 530;

[0042] The turning device 600, the rotating frame 610, the rotating shaft 611, the forming plate 620, the second slide rail 621, the second slider 622, the second accommodating groove 630, the core shaft 640, the spherical part 641, the supporting plate 650, and the second linear driving device 651;

[0043] Cutting mechanism 700, cutting bracket 710, moving plate 720, third slide rail 721, third slide block 722, second rotation driving device 730, cutting tool 740;

[0044] Discharging device 800, material chute 810;

[0045] The ejecting device 900 , the ejecting rod 910 , the third linear driving device 920 , and the guide plate 930 . DETAILED DESCRIPTION

[0046] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0047] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 on the present invention.

[0048] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0049] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0050] Reference Figures 3 to 13An embodiment of the utility model provides a U-shaped pipe bending machine, including a frame 300, a clamping mechanism 310, a bending die 400 and a flipping mechanism. The clamping mechanism 310 is installed on the frame 300, and the clamping mechanism 310 is used to clamp the pipe. The bending die 400 is installed on the frame 300 and is located on the front side of the clamping mechanism 310. The bending die 400 has a first accommodating groove 410. The first accommodating groove 410 includes a first bending portion 411, a straight portion 412 and a second bending portion 413 connected in sequence from bottom to top. The first bending portion 411 and the second bending portion 413 are both bent toward the rear side of the straight portion 412. The bending mechanism includes a lifting device 500 and a flipping device 600. The lifting device 500 includes a lifting frame 510 movably mounted on the frame 300. The lifting frame 510 is located on one side of the bending mold 400 and can reciprocate in the up and down directions. The flipping device 600 includes a rotating frame 610 rotatably mounted on the lifting frame 510. The rotating frame 610 is installed with a forming plate 620. The forming plate 620 is located on the front side of the bending mold 400 and extends to the lower side of the first bending portion 411. The upper surface of the forming plate 620 is provided with a second accommodating groove 630 corresponding to the first accommodating groove 410. When the rotating shaft 611 of the rotating frame 610 is coaxially arranged with the axis of the first bending portion 411, the rotating frame 610 can drive the forming plate 620 and drive the pipe to flip upward from the lower side of the first bending portion 411, so that the pipe flips upward to partially embed in the straight portion 412. When the rotating shaft 611 of the rotating frame 610 is coaxially arranged with the axis of the second bending portion 413 , the rotating frame 610 can drive the forming plate 620 and drive the pipe to flip backward from the front side of the straight portion 412 , so that the pipe flips backward to be partially embedded in the second bending portion 413 .

[0051] In the above structure, by setting the bending mechanism as a lifting device 500 and a flipping device 600, the lifting device 500 can drive the flipping device 600 to rise and fall, so that the rotating shaft 611 of the rotating frame 610 moves up and down between the axis of the first bending part 411 of the bending mold 400 and the axis of the second bending part 413, and the flipping device 600 can drive the pipe fitting to flip relative to the bending mold 400, and make the pipe fitting embedded in the first accommodating groove 410 of the bending mold 400, thereby processing and forming a U-shaped tube 200 with a straight middle section.

[0052] When bending, the pipe is inserted into the first bending portion 411 and placed in the second receiving groove 630, and the pipe is clamped and fixed by the clamping device. The rotating shaft 611 of the rotating frame 610 in the turning device 600 is first arranged coaxially with the axis of the first bending portion 411. At this time, the forming plate 620 is driven by the rotating frame 610 to turn upward from the lower side of the first bending portion 411, and the pipe is turned upward around the axis of the first bending portion 411 to the straight portion 412 partially embedded in the first receiving groove 410, so that the pipe can be bent. The first curved tube portion 240 and the middle straight section are folded out, and then the lifting plate of the lifting device 500 drives the flipping device 600 to move upward, so that the rotating shaft 611 of the rotating frame 610 is coaxially arranged with the axis of the second bending portion 413. At this time, the rotating frame 610 drives the forming plate 620 to flip backward from the front side of the straight section 412, and the pipe is flipped backward to the second bending portion 413 partially embedded in the first accommodating groove 410, so that the second curved tube portion 250 can be bent at the upper end of the middle straight section. The entire processing process is completed at the same station, and the lifting device 500 and the flipping device 600 cooperate with each other to quickly process the U-shaped tube 200 with a straight middle section, which has high processing efficiency.

[0053] It is understandable that, referring to Figures 3 to 13 The lifting device 500 includes a lifting frame 510 movably mounted on the frame 300. The lifting frame 510 is located on one side of the bending mold 400 and can reciprocate in the up-down direction. Specifically, the frame 300 is equipped with a first linear drive device 530 that is transmission-connected to the lifting frame 510. The lifting frame 510 is driven to reciprocate in the up-down direction relative to the frame 300 by the first linear drive device 530. In addition, the frame 300 is provided with a first slide rail 511 arranged in the up-down direction. The first slide seat is movably mounted on the first slide rail 511. The lifting frame 510 is mounted on the first slide seat. Thus, the first linear drive device 530 can drive the lifting frame 510 and the first slide seat to move up and down along the first slide rail 511. It can be understood that the first linear drive device 530 can specifically adopt a cylinder, a hydraulic cylinder, an electric push rod or a screw nut mechanism driven by a motor, etc., and the utility model does not make specific limitations on this.

[0054] Reference Figures 9 to 11In some embodiments, the clamping mechanism 310 includes a first clamping portion and a second clamping portion 312 that can move relatively close to or away from each other, and a clamping groove 313 capable of accommodating a pipe is defined between the first clamping portion and the second clamping portion 312. The size of the clamping groove 313 is controlled by the relative movement between the first clamping portion and the second clamping portion 312, so that the pipe is clamped. Specifically, the first clamping portion is fixedly mounted on the frame 300, and the second clamping portion 312 is movably mounted on the frame 300. The frame 300 is equipped with a fourth linear drive device 314 that is transmission-connected to the second clamping portion 312. The fourth linear drive device 314 can drive the second clamping portion 312 to move close to or away from the first clamping portion to adjust the size of the clamping groove 313, and then adjust the clamping force on the pipe. The first clamping part and the second clamping part 312 are arranged relative to each other in the up-down direction, the first clamping part is located on the upper surface of the frame 300, and the second clamping part 312 extends downward to the lower space of the frame 300, thereby making full use of the installation space of the frame 300 and reducing the overall volume of the U-shaped bending machine. It can be understood that the fourth linear drive device 314 can specifically adopt a cylinder, a hydraulic cylinder, an electric push rod or a motor-driven screw nut mechanism, etc., and the utility model does not make specific limitations on this.

[0055] Reference Figure 1 and Figure 2 In some embodiments, the frame 300 is further provided with a straightening mechanism 320 and a guiding mechanism 330. The straightening mechanism 320 is located at the rear side of the clamping mechanism 310 and is used to straighten the pipe. The guiding mechanism 330 is located between the straightening mechanism 320 and the clamping mechanism 310 and is used to guide the pipe to avoid bending, deformation and other undesirable phenomena of the pipe.

[0056] Reference Figures 3 to 12 In some embodiments, a mandrel 640 capable of inserting a pipe is installed in the second receiving groove 630. The rotating frame 610 has a support plate 650, and the forming plate 620 is movably installed on the support plate 650. The second receiving groove 630 is arranged along the length direction of the support plate 650. A second linear drive device 651 connected to the forming plate 620 is installed on the support plate 650. The second linear drive device 651 can drive the forming plate 620 and drive the mandrel 640 to reciprocate along the length direction of the support plate 650.

[0057] In the above structure, by installing the mandrel 640 that can be inserted into the pipe in the second receiving groove 630, it is possible to prevent the pipe from being sunken and deformed during the bending process. When bending, the pipe is extended into the first bending portion 411 and placed in the second receiving groove 630, and the mandrel 640 is inserted into the pipe. During the bending process, the second linear drive device 651 drives the forming plate 620 to move along the length direction of the support plate 650, so that the mandrel 640 moves with the pipe during the bending process and gradually moves out of the pipe, so that it will not interfere with the inner wall of the pipe during the bending process to affect the bending of the pipe, and at the same time, the internal space of the pipe can be filled during the bending process to avoid the occurrence of sunken deformation during the bending process.

[0058] It is understandable that, referring to Figures 3 to 12 In some embodiments, a second slide rail 621 is provided on the surface of the support plate 650 and arranged along the length direction of the support plate 650. A second slide seat is slidably installed on the second slide rail 621, and the forming plate 620 is installed on the second slide seat. Thus, the second linear drive device 651 can drive the forming plate 620 and drive the core shaft 640 to reciprocate along the second slide rail 621.

[0059] Reference Figures 3 to 12 In some embodiments, the rear end of the core shaft 640 has a spherical portion 641 .

[0060] In the above structure, by setting the rear end of the core shaft 640 as the spherical portion 641, it is possible to avoid scratches on the inner wall of the pipe during movement due to the sharp end of the core shaft 640, thereby protecting the pipe.

[0061] In some embodiments, the U-shaped pipe bending machine also includes a control system, and the lifting frame 510 is equipped with a first rotation drive device 520 and an angle detection device electrically connected to the control system. The first rotation drive device 520 is transmission-connected to the rotating frame 610 and can drive the rotating frame 610 to rotate relative to the lifting frame 510. The angle detection device can detect the rotation angle of the rotating frame 610, and the control system can control whether the first rotation drive device 520 works or not according to the angle information fed back by the angle detection device.

[0062] In the above structure, an angle sensor and a control system are provided, and the rotation angle of the rotating frame 610 is detected by the angle sensor, and the detected angle information is fed back to the control system. The control system analyzes and determines whether the rotating frame 610 is rotated into place based on the angle information fed back by the angle detection device. If it is determined that the rotating frame 610 has not rotated into place, the first rotation drive device 520 is controlled to continue working to drive the rotating frame 610 to continue rotating; if it is determined that the rotating frame 610 is rotated into place, the first rotation drive device 520 is controlled to stop working, so that the pipe fitting is accurately embedded in the straight portion 412 or the second bending portion 413, thereby preventing the rotating frame 610 from causing the pipe fitting to flip excessively, thereby causing the pipe fitting or the bending mold 400 to be deformed and damaged due to excessive force.

[0063] It is understandable that the first rotary drive device 520 may specifically be a motor, a rotary cylinder, a rotary hydraulic cylinder or the like, and the present invention does not make any specific limitation on this.

[0064] It is understandable that the angle detection device may specifically be an angle encoder, a Hall sensor or other device that can detect angle changes, and the present invention does not make any specific limitation on this.

[0065] Reference Figure 3 , Figure 4 as well as Fig.14 In some embodiments, the U-shaped pipe bending machine further includes a cutting mechanism 700, which includes a cutting bracket 710 installed on the frame 300, a moving plate 720 is movably installed on the cutting bracket 710, a second rotary drive device 730 and a cutting tool 740 connected to the second rotary drive device 730 are installed on the moving plate 720, and the cutting tool 740 is located at the rear side of the bending mold 400 in the front-to-back direction, and the moving plate 720 can drive the cutting tool 740 to move in a direction perpendicular to the front-to-back direction.

[0066] In the above structure, by setting up the cutting mechanism 700, and in the front-to-back direction, the cutting tool 740 is located on the rear side of the bending mold 400, thereby, the movable plate 720 can drive the cutting tool 740 to move in a direction perpendicular to the front-to-back direction, and at the same time the second rotary drive device 730 can drive the cutting tool 740 to rotate, so that the processed U-shaped tube 200 with a straight middle section can be cut off, and then the next U-shaped tube 200 with a straight middle section can be processed.

[0067] It can be understood that the movable plate 720 can drive the cutting tool 740 to move in a direction perpendicular to the front-rear direction. Figure 3 , Figure 4 and Fig.14The direction perpendicular to the front-rear direction may be the left-right direction. Of course, in addition to this, the direction perpendicular to the front-rear direction may also be the up-down direction or other directions, and the present invention does not make any specific limitation on this.

[0068] It is understandable that the second rotary drive device 730 may specifically be a motor, a rotary cylinder, a rotary hydraulic cylinder or the like, and the present invention does not make any specific limitation on this.

[0069] It is understandable that, referring to Fig.14 In some embodiments, a third slide rail 721 arranged in the left-right direction is installed on the cutting bracket 710, a third slide seat is slidably installed on the third slide rail 721, and the movable plate 720 is installed on the third slide seat, so that the movable plate 720 can drive the cutting tool 740 to reciprocate along the third slide rail 721. The movement of the movable plate 720 can be driven manually by an operator, or a fifth linear drive device connected to the movable plate 720 can be installed on the cutting bracket 710, and the movable plate 720 is driven to reciprocate along the third slide rail 721 by the fifth linear drive device. It can be understood that the fifth linear drive device can be a cylinder, a hydraulic cylinder, an electric push rod or a screw nut mechanism driven by a motor, etc., which is not specifically limited by the present invention.

[0070] Reference Figure 3 , Figure 4 , Fig.15 and Fig.16 In some embodiments, the frame 300 is further provided with a discharging device 800, and the discharging device 800 is provided with a blanking chute 810 which is at least partially located below the bending mold 400, and the bottom wall of the blanking chute 810 is arranged to be inclined outward from top to bottom and extends to the outside of the bracket.

[0071] In the above structure, by setting up the discharge device 800, after the cutting mechanism 700 cuts off the processed U-shaped tube 200 with a straight middle section, the U-shaped tube 200 with a straight middle section can fall into the blanking trough 810 and be transported downward along the bottom wall of the blanking trough 810 to the outside of the bracket, thereby facilitating the discharge of the pipe fittings without setting up an additional transfer mechanism and making full use of the lower space of the frame 300, thereby further reducing the overall volume of the U-shaped pipe bending machine.

[0072] It can be understood that, in the above structure, a storage box can be placed at the lower end of the material chute 810, thereby facilitating the collection of the U-shaped tube 200 with a straight middle section.

[0073] Reference Figure 3 , Figure 4 , Fig.17 and Fig.18In some embodiments, the frame 300 is also provided with a push-up device 900 located at the rear side of the bending mold 400, and the push-up device 900 includes a push rod 910 movably installed on the frame 300, and the push rod 910 is arranged along the front-to-back direction. The frame 300 is installed with a third linear drive device 920 that is transmission-connected to the push rod 910, and the third linear drive device 920 can drive the push rod 910 to move along the front-to-back direction and make the push rod 910 extend into the second curved pipe portion 250 of the pipe fitting.

[0074] In the above structure, a ejection device 900 is arranged on the rear side of the bending mold 400. After the cutting mechanism 700 cuts the processed U-shaped tube 200 with a straight middle section, the ejector rod 910 is driven forward by the third linear drive device 920 and extends into the second curved tube portion 250. Thus, the processed pipe can be pushed forward from the first accommodating groove 410 of the bending mold 400, so that the cut pipe can directly fall into the blanking groove 810.

[0075] It is understandable that the third linear drive device 920 may specifically be a cylinder, a hydraulic cylinder, an electric push rod, or a screw-nut mechanism driven by a motor, etc., and the present invention does not make any specific limitation on this.

[0076] Reference Figure 3 , Figure 4 , Fig.17 and Fig.18 In some embodiments, the bracket is installed with a guide plate 930 located between the third linear drive device 920 and the bending mold 400. The guide plate 930 is provided with a guide hole adapted to the ejector rod 910, and the ejector rod 910 is movably inserted into the guide hole.

[0077] In the above structure, a guide plate 930 is provided between the third linear drive device 920 and the bending mold 400, and the push rod 910 is passed through the guide hole of the guide plate 930, thereby supporting and guiding the push rod 910, preventing the free end of the push rod 910 from bending downward, causing the push rod 910 to be unable to move forward and be inserted into the second curved pipe portion 250 of the pipe fitting, thereby making it inconvenient for the normal progress of the pushing process.

[0078] Reference Figures 3 to 8 In some embodiments, the number of first receiving grooves 410 provided on the bending mold 400 is at least two, all the first receiving grooves 410 are arranged at intervals along the left-right direction, and the second receiving grooves 630 opened on the forming plate 620 correspond one-to-one to all the first receiving grooves 410 .

[0079] In the above structure, by setting at least two first accommodating grooves 410 on the bending mold 400, each first accommodating groove 410 can cooperate with the corresponding second accommodating groove 630 to process a U-shaped tube 200 with a straight middle section, thereby enabling the U-shaped tube bending machine to process at least two pipes at the same time.

[0080] It is understandable that, referring to Figure 5 The number of first receiving grooves 410 provided on the bending mold 400 is two, referring to Figure 6 , the number of the first receiving grooves 410 provided on the bending mold 400 is five. The number of the first receiving grooves 410 provided on the bending mold 400 may be two, five, three, four, six or more, and the utility model does not make any specific limitation on this.

[0081] Reference Figure 5 and Figure 6 In some embodiments, the number of the bending molds 400 is two, and each bending mold 400 can be detachably mounted on the frame 300 ; the length of one straight portion 412 is greater than the length of the other straight portion 412 .

[0082] In the above structure, two bending dies 400 are provided, and the lengths of the straight portions 412 of the two bending dies 400 are different, so that the bending dies 400 can be replaced as needed to process a U-shaped tube with the required length of the middle straight tube section 230 .

[0083] It is understandable that the number of the above bending dies 400 is two, which is only for Figure 5 and Figure 6As an exemplary illustration, in some embodiments, the number of the bending molds 400 may be three, four or more, which is not specifically limited by the present invention. In addition, in two of the bending molds 400, in addition to the length of one of the straight portions 412 being greater than the length of the other straight portion 412, the bending radius of one of the first bending portions 411 may be greater than the bending radius of the other first bending portion 411, or the bending radius of one of the second bending portions 413 may be greater than the bending radius of the other second bending portion 413, which is not specifically limited by the present invention. In addition, in two of the bending molds 400, in addition to one of the parameters of the length of the straight portion 412, the bending radius of the first bending portion 411, and the bending radius of the second bending portion 413 being different, two of the parameters of the length of the straight portion 412, the bending radius of the first bending portion 411, and the bending radius of the second bending portion 413 may be different, or the three parameters of the length of the straight portion 412, the bending radius of the first bending portion 411, and the bending radius of the second bending portion 413 may be different. The utility model does not make specific limitations on this, thereby increasing the scope of application of the U-shaped pipe bender.

[0084] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. U-shaped pipe bending machine, characterized in that, include: Rack(300); A clamping mechanism (310) is installed on the frame (300), and the clamping mechanism (310) is used to clamp the pipe; A bending mold (400) is installed on the frame (300) and located at the front side of the clamping mechanism (310), the bending mold (400) having a first accommodating groove (410), the first accommodating groove (410) comprising a first bending portion (411), a straight portion (412) and a second bending portion (413) connected in sequence from bottom to top, the first bending portion (411) and the second bending portion (413) both being bent toward the rear side of the straight portion (412); The bending mechanism comprises a lifting device (500) and a flipping device (600), wherein the lifting device (500) comprises a lifting frame (510) movably mounted on the frame (300), the lifting frame (510) being located on one side of the bending mold (400) and being capable of reciprocating in the up-down direction, and the flipping device (600) comprising a rotating frame (610) rotatably mounted on the lifting frame (510), the rotating frame (610) being mounted with a forming plate (620), the forming plate (620) being located on the front side of the bending mold (400) and extending to the lower side of the first bending portion (411), and the upper surface of the forming plate (620) being provided with a second containing groove (630) corresponding to the first containing groove (410); When the rotating shaft (611) of the rotating frame (610) is coaxially arranged with the axis of the first bending portion (411), the rotating frame (610) can drive the forming plate (620) and drive the pipe to flip upward from the lower side of the first bending portion (411), so that the pipe flips upward to be partially embedded in the straight portion (412); When the rotating shaft (611) of the rotating frame (610) is coaxially arranged with the axis of the second bending portion (413), the rotating frame (610) can drive the forming plate (620) and drive the pipe to flip backward from the front side of the straight portion (412), so that the pipe flips backward until it is partially embedded in the second bending portion (413).

2. The U-shaped pipe bending machine according to claim 1, characterized in that: A core shaft (640) capable of inserting a pipe is installed in the second receiving groove (630); The rotating frame (610) comprises a supporting plate (650), the forming plate (620) is movably mounted on the supporting plate (650), the second containing groove (630) is arranged along the length direction of the supporting plate (650), and a second linear driving device (651) which is transmission-connected to the forming plate (620) is mounted on the supporting plate (650), and the second linear driving device (651) is capable of driving the forming plate (620) and driving the core shaft (640) to reciprocate along the length direction of the supporting plate (650).

3. The U-shaped pipe bending machine according to claim 2, characterized in that: The rear end of the core shaft (640) has a spherical portion (641).

4. The U-shaped pipe bending machine according to claim 1, characterized in that: The invention also includes a control system, wherein the lifting frame (510) is provided with a first rotation drive device (520) and an angle detection device electrically connected to the control system, the first rotation drive device is transmission-connected to the rotating frame (610) and can drive the rotating frame (610) to rotate relative to the lifting frame (510), the angle detection device can detect the rotation angle of the rotating frame (610), and the control system can control whether the first rotation drive device (520) works or not according to the angle information fed back by the angle detection device.

5. The U-shaped pipe bending machine according to claim 1, characterized in that: The invention also comprises a cutting mechanism (700), wherein the cutting mechanism (700) comprises a cutting bracket (710) mounted on the frame (300), a movable plate (720) being movably mounted on the cutting bracket (710), a second rotary drive device (730) and a cutting tool (740) being transmission-connected to the second rotary drive device (730) being mounted on the movable plate (720), wherein in the front-to-back direction, the cutting tool (740) is located at the rear side of the bending mold (400), and the movable plate (720) is capable of driving the cutting tool (740) to move in a direction perpendicular to the front-to-back direction.

6. The U-shaped pipe bending machine according to claim 5, characterized in that: The frame (300) is also provided with a discharge device (800), and the discharge device (800) is provided with a discharge chute (810) at least partially located below the bending mold (400), and the bottom wall of the discharge chute (810) is arranged to be inclined outward from top to bottom and extends to the outside of the bracket.

7. The U-shaped pipe bending machine according to claim 6, characterized in that: The frame (300) is also provided with a push-up device (900) located at the rear side of the bending mold (400), the push-up device (900) comprising a push rod (910) movably mounted on the frame (300), the push rod (910) being arranged along the front-to-back direction, the frame (300) being provided with a third linear drive device (920) transmission-connected to the push rod (910), the third linear drive device (920) being capable of driving the push rod (910) to move along the front-to-back direction and allowing the push rod (910) to extend into the second curved pipe portion (250) of the pipe fitting.

8. The U-shaped pipe bending machine according to claim 7, characterized in that: The bracket is provided with a guide plate (930) located between the third linear drive device (920) and the bending mold (400); the guide plate (930) is provided with a guide hole adapted to the push rod (910); the push rod (910) is movably inserted into the guide hole.

9. The U-shaped pipe bending machine according to claim 1, characterized in that: The number of the first accommodating grooves (410) provided on the bending mold (400) is at least two, all of the first accommodating grooves (410) are arranged at intervals along the left-right direction, and the second accommodating grooves (630) opened on the forming plate (620) correspond one-to-one to all of the first accommodating grooves (410).

10. The U-shaped pipe bending machine according to claim 1, characterized in that: The number of the bending molds (400) is at least two, and each of the bending molds (400) can be detachably mounted on the frame (300); In two of the bending molds (400), the length of one of the straight portions (412) is greater than the length of the other straight portion (412), and / or the bending radius of one of the first bending portions (411) is greater than the bending radius of the other first bending portion (411), and / or the bending radius of one of the second bending portions (413) is greater than the bending radius of the other second bending portion (413).

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