113 results about "Tube bending" patented technology

The invention belongs to the technical field of metal pipe continuous bending, and particularly relates to a metal pipe continuous bending device which comprises a rack, two sets of transmission shafts are symmetrically and rotationally installed in the rack, two sets of chain wheels are symmetrically installed on the transmission shafts, the two sets of chain wheels are meshed with two sets of chains correspondingly, and a plurality of sets of pressing modules are arranged between the two sets of chains in a surrounding mode. A plurality of sets of press-fit modules are arranged on the rack, placing grooves and bending grooves are formed in the press-fit modules and communicate with each other, a bending mechanism is arranged on the rack, the press-fit modules are driven to do circular motion, each set of press-fit module can sequentially pass through a feeding point and the bending mechanism, in the metal pipe bending process, a worker can conduct feeding and discharging at the same time, and the working efficiency is improved. And the feeding and discharging time is saved, so that the metal pipe can be continuously bent, and the bending efficiency of the metal pipe is improved.

The embodiment of the invention provides a quartz tank processing jig and a processing method, and relates to the technical field of quartz product processing. The quartz tank machining jig comprises an inner pipe machining jig and a bent pipe machining jig. The inner pipe machining jig comprises a first bottom plate and a first side plate. The first side plate is fixed to one side of the first bottom plate, and two first positioning grooves arranged at intervals are formed in the first bottom plate. The two first positioning grooves are formed in the direction perpendicular to the first side plate. The first positioning groove is used for placing a quartz circular plate. And a plurality of circular holes are formed in the quartz circular plate. The bent pipe machining jig comprises a second bottom plate and a second side plate. The two second side plates are arranged on the two sides of the second bottom plate respectively. A second positioning groove is formed in the top of the second side plate. An arc groove is formed in the second bottom plate. A baffle is arranged in one end of the arc groove. The machining process can be simplified, the machining efficiency is improved, the machining cost is reduced, and the high-precision machining quality is guaranteed.

The utility model provides a kind of heater pipeline bending device, it is related to bending device technical field, the utility model includes pipe bender, the surface rotation of pipe bender is provided with carousel, the surface fixedly connected with pressure plate of carousel, the surface of pipe bender is fixedly connected with the center hole position of carousel and has stop lever, the installation of pipe bender has limit stop, the side of pipe bender is provided with control panel, the surface of stop lever is provided with stabilizing device, wherein stabilizing device is limited with the stabilizing of electric heating tube of bending by means of stabilizing plate and rotating ring, the stabilizing device includes two stabilizing plates, wherein two stabilizing plates are commonly installed with connecting plate, and the inner wall of two stabilizations is commonly slidably connected with mounting bracket, the utility model can better guarantee the position stability of pipe fitting when using pipe bender to carry out bending processing to heater pipeline, not prone to warping deviation, guarantee the quality and forming effect of bending, improve the practicality of pipe bender.

The invention provides a U pipe detection device and a pipe bending all-in-one machine thereof.The U pipe detection device detects a to-be-detected U pipe used for being clamped on a mold, the to-be-detected U pipe comprises a U pipe body and a welding ring arranged on the U pipe body in a sleeving mode, and the U pipe detection device comprises a supporting base fixed to one side of the mold; the detection assembly comprises a detection rod and a detection sleeve arranged outside the detection rod in a sleeving mode, the detection sleeve and the detection rod are located on the side, close to the to-be-detected U pipe, of the supporting base, an annular insertion groove used for allowing the end of a U pipe body to be inserted therein is formed between the detection sleeve and the detection rod, and the outer end face of the detection sleeve is used for abutting against the welding ring; the detection sleeve and the detection rod are movably arranged relative to the supporting base in the preset direction, so that when the end of the U pipe body is inserted into the annular insertion groove, and the outer end face of the detection sleeve abuts against the welding ring, it is indicated that the U pipe to be detected is a qualified product. The bending and sleeving all-in-one machine solves the problem that in the prior art, the maintenance cost needed by a small U pipe detection mode adopted by a bending and sleeving all-in-one machine is high.

The utility model discloses a titanium tube bending machine, and particularly relates to the technical field of titanium tube processing, which comprises a fixed seat, an L-shaped supporting table is fixedly arranged at the top end of the fixed seat, a first supporting rod is fixedly arranged at the top of one end of the L-shaped supporting table, and a fixed tube bending disc is arranged at the top end of the first supporting rod; a rotating rod is fixedly arranged on an output shaft of the motor, a rotating plate is fixedly arranged at the outer end of the rotating rod, a fixed supporting plate is fixedly arranged at the top of one end of the rotating plate, a second supporting rod is fixedly arranged at the top end of the fixed supporting plate, and a fixing column is arranged at the top end of the second supporting rod. The fixed pipe bending disc and the rotary pipe bending disc are limited and fixed to the top ends of the first supporting rod and the second supporting rod through the limiting assemblies, so that the replacement process of the fixed pipe bending disc and the rotary pipe bending disc is simple and convenient, the replacement efficiency is high, the titanium pipe bending machine can be further suitable for bending titanium pipes of different sizes, and practicability is high.

The utility model discloses a composite tube plate integral serial sheet type protective gas cooler, which relates to the field of protective gas cooling and comprises an outer shell, heat exchange tubes and fins. The outer shell comprises a U-shaped protective plate, side plates and a first tube plate, the pair of side plates are fixedly installed on the U-shaped protective plate, the heat exchange tubes are U-shaped heat exchange tubes and are integrally bent, the U-shaped heat exchange tubes are installed in the outer shell, integral fins are connected to the U-shaped heat exchange tubes in an expanded mode, and the first tube plate and the second tube plate are fixedly installed on the outer shell. The first tube plate is fixedly installed on the pair of side plates on the opposite side of the U-shaped protection plate to form an outer shell, the second tube plate is fixedly installed on the other side of the first tube plate through a connecting protection piece, and the water chamber is fixedly installed on the second tube plate. And a heat exchange tube is blocked, a welded junction is heated at high temperature, and water leaks into the furnace once the welded junction cracks, so that the dew point of shielding gas is increased.

This invention discloses a tube bending and shaping device for children's vehicle manufacturing, comprising a machine body, on which conveying rollers and positioning seats are symmetrically arranged. The conveying rollers are used to convey the tubes. A steering cylinder for rotating the tubes is arranged between the conveying rollers and the positioning seats on the machine body. A bending rotating seat is rotatably arranged at one end of the machine body located at the positioning seat. A bending wheel for bending the tubes is fixedly arranged at one end of the bending rotating seat. A tube end limiter for clamping and fixing the tubes is arranged on one side of the bending wheel. A bending fixing block adapted to the tube end limiter is slidably arranged at the other end of the bending rotating seat. During bending, one end of the tube is clamped and fixed by the bending fixing block and the tube end limiter. Then, the bending wheel rotates with the bending rotating seat to bend the tubes. It can also be used in conjunction with the steering cylinder to bend the tubes, so that the tubes can be bent in multiple directions to meet different tube bending requirements.

The utility model discloses a pneumatic pipe bender for heat conduction pipe production, and relates to the technical field of heat conduction pipe production, the pneumatic pipe bender comprises a pipe bending assembly, the pipe bending assembly comprises a base, a pipe bending frame and two sliding blocks, the top of one end of the pipe bending frame and the tops of one ends of the two sliding blocks are fixedly provided with installation rods, and the installation rods are fixedly connected with the base. A fixing head is fixedly mounted at the top of the mounting rod, a fixing groove is formed in the outer side of the fixing head, the mounting rod is sleeved with a replacement assembly, the fixing head is sleeved with a quick-release fixing piece, the quick-release fixing piece comprises a fixing sleeve, the fixing head is sleeved with the fixing sleeve, and a pressing piece is fixedly mounted at the bottom of the fixing sleeve. A plurality of ball holes are formed in the side face of the fixing sleeve, fixing balls are arranged in the ball holes, and the outer side of the fixing sleeve is sleeved with a handle sleeve. According to the utility model, the replacement assembly can be replaced according to needs, the installation and the disassembly can be conveniently carried out, and the practical value is relatively high.

The technical scheme belongs to the technical field of oil pipe bending device and specifically relates to an oil pipe bending device and automatic bending equipment, which comprises a base, an upper pipe mechanism movably arranged on the base, the upper pipe mechanism being provided with a plurality of standby material grooves for bearing nuts and oil pipes; a pipe bending seat arranged on the base, the pipe bending seat being provided with pipe arc grooves corresponding to the standby material grooves; and a top bending mechanism movably arranged on the base, the moving direction of the top bending mechanism being perpendicular to the moving direction of the upper pipe mechanism, the top bending mechanism being rotatably provided with top bending rollers corresponding to the pipe arc grooves, the top bending rollers having concave arc grooves in the circumferential direction; after the upper pipe mechanism moves downward, the side part of the oil pipe is clamped and limited in the pipe arc groove, the top bending mechanism drives the top bending rollers to move toward one side of the pipe bending seat, the top bending rollers press and bend the oil pipe into the pipe arc groove, and through the vertical feeding positioning of the upper pipe mechanism and the horizontal feeding bending action of the top bending mechanism, automatic and continuous operation from standby material to forming is realized, and the bending precision and production efficiency are improved.

The utility model provides quick pipe bending equipment, and belongs to the technical field of pipe bending equipment. The rapid pipe bending equipment comprises a supporting platform. An air expansion shaft is arranged on the supporting platform, a bending wheel is detachably arranged on the air expansion shaft, a bending device is installed on the supporting platform, and the bending end of the bending device is located over the bending wheel. And a first limiting piece is installed on the portion, located on one side of the bending wheel, of the supporting platform, and the bending wheel is detachably arranged on the air expansion shaft, so that the bending wheel can be rapidly replaced, the bending wheels with multiple bending angles can be replaced, the pipe bending equipment can bend multiple angles, and the production requirement of the pipe bending equipment is met.

The utility model relates to the technical field of welding tools, in particular to a liravar elbow tailor-welding tool which is composed of a base, a side plate, a bent frame supporting plate, a connecting plate supporting plate, a limiting block, a positioning block, a first rapid pressing clamp and a second rapid pressing clamp. The side plate is fixed to one side of the base, the two first rapid pressing pliers are arranged on the side plate, the limiting block and the positioning block are installed on the side plate, and the positioning block is provided with a positioning structure with a through hole. The bent frame supporting plate and the connecting plate supporting plate are located on the two sides of the base respectively, a first positioning groove is formed in the bent frame supporting plate, a plurality of second positioning grooves are formed in the connecting plate supporting plate, and the second rapid pressing clamp is installed on the base. According to the tool, accurate positioning and fixing of the bent pipe part are achieved through the positioning groove and the pressing clamp structure, manual splicing errors are effectively avoided, the accuracy and consistency of the welding position are remarkably improved, and therefore the product welding quality is improved.

The utility model discloses a continuous pipe bending machine and relates to the field of pipe bending machines, the continuous pipe bending machine comprises a feeding mechanism and a discharging mechanism which are located on the two sides of a machine box, a linear conveying mechanism is fixedly connected in the machine box and comprises a conveying plate arranged at the top, and four first clamping mechanisms used for clamping pipe fittings are fixedly connected to the top of the conveying plate; four end clamping mechanisms are evenly arranged at the positions, located on the rear side of the linear conveying mechanism, in the machine box at equal intervals, and a first lifting mechanism and a second lifting mechanism are symmetrically arranged at the top and the bottom in the machine box correspondingly. A first pipe bending mechanism, a second pipe bending mechanism, a third pipe bending mechanism and a fourth pipe bending mechanism which are in one-to-one correspondence with the four end clamping mechanisms are arranged between the first lifting mechanism and the second lifting mechanism in parallel. According to the equipment, various procedures can be completed at a time, the pipe fitting can be continuously bent, the production efficiency is greatly improved, meanwhile, the equipment power is small, energy is saved, the site area is reduced, and the utilization rate of a factory workshop is high.

This invention discloses a plastic tube shaping head structure, relating to the field of plastic tube bending technology. It has the advantage of improving cooling efficiency, thereby reducing the springback of the plastic tube. The key technical points are: a heating box for heating the plastic tube and a discharge cylinder located on one side of the heating box. A turntable is rotatably connected to the discharge cylinder via a rotating mechanism. The turntable has two semi-circular bending wheels, and a pushing mechanism for moving the two bending wheels is also provided on the turntable. A bending mechanism is also included on the turntable, cooperating with the two bending wheels. When the pushing mechanism drives the two bending wheels closer together, the bending mechanism, in cooperation with the two bending wheels, clamps the plastic tube. At this time, the bending mechanism is used to bend the clamped plastic tube through the two bending wheels. Furthermore, an air-cooling mechanism is provided on the turntable for air-cooling the opposite sides of the outer wall of the bent plastic tube.

The application discloses a mandrel structure for reducing the friction between a mandrel and the inner wall of a pipe in a pipe bending forming process. The mandrel structure comprises a control shaft, a hollow core shaft and a plurality of inflatable core balls; the hollow core shaft and the plurality of inflatable core balls are arranged outside the control shaft; each inflatable core ball mainly comprises a rolling bearing, a base section, a return spring ring, a sliding pressure disc and an arc piece; the rolling bearing and the base section are sequentially sleeved outside the control shaft from inside to outside, the sliding pressure disc is sleeved outside the control shaft and is threadedly connected with the control shaft, the return spring ring and a plurality of wedge-shaped grooves which are uniformly arranged in a circumferential direction are arranged between the base section and the sliding pressure disc, one arc piece is arranged in each wedge-shaped groove, and all the arc pieces are connected through the return spring ring. The application can be used for pipe bending forming, has a simple structure, is convenient to adjust, can relieve the problems of scratch of the inner wall of the pipe, cross-section distortion defect and core extraction difficulty in pipe forming, and improves the pipe forming quality.

The present invention discloses a combined, waste-free short tube bending machine. This machine addresses the shortcomings of current chip-free cutting and bending technologies for short tubes. The machine comprises a straightening device, a cutting device, a shaping device, a transfer device, and a bending device, wherein the straightening device, cutting device, shaping device, and bending device are sequentially arranged along the X-axis direction. The straightening device conveys the straightened tube material to the cutting device, the cutting device performs circular cutting and segmenting on the tube material, the shaping device receives the tube segments and shapes the tube ends of the tube segments, the transfer device transfers the tube segments to the bending device, and the bending device bends the tube segments. The combined, waste-free short tube bending machine transports the tubes between the various devices along the X-axis, simplifying the tube processing and transportation route. The machine eliminates the need for material collection and secondary feed conversion mechanisms, material straightening, and reloading, eliminating the secondary feeding process and cost. Furthermore, the machine reduces the probability of unexpected failures, saves time, and improves production efficiency.

This utility model discloses a forming tube bending testing machine, belonging to the field of pipe bending testing technology. It includes a base plate, a support column fixedly mounted on the upper surface of the base plate, a platform fixedly mounted on the top of the support column, a power mechanism fixedly mounted on the upper surface of the platform, and a fixing mechanism fixedly mounted on the side wall of the support column. The forming tube is assembled between the output end of the fixing mechanism and the power mechanism. An elbow assembly is symmetrically mounted on the upper surface of the base plate. This utility model uses hydraulically driven wedge-shaped adjusting blocks to move, thereby pushing multiple bending support blocks to slide along a fixed rod. This changes the distribution radius of the fan-shaped support surface formed by the bending support blocks and the fixed support blocks. Without changing the physical mold, the same set of elbow assemblies can adapt to the bending test requirements of forming tubes of different diameters or achieve test requirements of different bending radii, improving the versatility and experimental efficiency of the equipment.

The utility model relates to the technical field of chemical fiber paper tube bending -resistant, disclose a kind of chemical fiber paper tube bending -resistant device, including bottom plate, the top of bottom plate is provided with fixed mechanism, the top of bottom plate is fixedly connected with top frame, the bottom of top frame is provided with drying mechanism, the top of bottom plate is fixedly connected with bearing plate;The fixed mechanism includes adjusting assembly, the top of adjusting assembly is slidably connected with two drive assemblies, the similar side of two drive assemblies is fixedly connected with moving disc, the similar side of two moving discs is fixedly connected with multiple fixed blocks one, the inside of multiple fixed blocks one is fixedly connected with fixed shaft one.In the utility model, by adjusting the position of sliding block on slide rail and the telescopic amount of control cylinder, the expansion degree of the support ring can be changed, so that the chemical fiber paper tube with different inner diameter can be adapted, and the support and positioning of the chemical fiber paper tube with different size can be realized.

The utility model discloses a PHA material straw which comprises an outer straw body, an inner straw body is in threaded connection with the interior of the upper end of the outer straw body, an upper connecting ring is arranged at the lower end of the outer straw body, a plurality of elastic petal pipes are connected to the lower end of the upper connecting ring, and a lower connecting ring is connected to the lower ends of the elastic petal pipes. The lower end of the lower connecting ring is provided with an inverted-cone-shaped puncture suction head, the upper side of the outer portion of the inner suction pipe is connected with a limiting ring, the upper end of the upper connecting ring is connected with a connecting sealing pipe, the connecting sealing pipe is inserted into the lower end of the outer suction pipe and tightly attached to the outer wall of the inner suction pipe, and the lower end of the inner suction pipe is internally connected with an upper connecting frame. Through threaded connection of the outer suction tube and the inner suction tube and deformation control of the elastic petal tubes, switching between the straight suction function and the filtering suction function is achieved, the elastic petal tubes are tightly attached to form a sealed connection straight tube during straight suction, the elastic petal tubes are bent to form filtering gaps during filtering suction, the structure is simple, and the functions are diversified.

This invention discloses a method for analyzing the bending degree of tubing used in leisure tables and chairs, comprising: acquiring the original curvature signal of the bending segment from a continuous curvature scanning probe on a tubing bending testing platform, and simultaneously acquiring wall thickness distribution data of the bending segment from an ultrasonic thickness gauge probe at the arc apex; identifying the boundary between the positioning bending segment and the straight segment where the bending transition characteristic changes stably from non-zero to zero in the measured bending morphology, and extracting the steepness of the bending-straight boundary in the boundary between the positioning bending segment and the straight segment; locating the arc apex position of the bending segment in the measured bending morphology, extracting the target wall thickness at the arc apex position from the wall thickness distribution data, and using this as the target residual wall thickness at the arc apex; obtaining the overall arc length constraint set by the tubing bending process, calculating the total arc length of the actual bending segment using the measured bending morphology, and determining the difference between the overall arc length constraint and the total arc length as the arc length surplus.

This invention proposes a processing technology for hollow stabilizer bars in automobiles. The core of this technology lies in first achieving the final mechanical properties of the tubing through heat treatment, followed by forming and subsequent processing. The process involves online induction heat treatment of the hollow straight tube: sequential induction heating austenitization, quenching (martensitic transformation), and medium-frequency induction tempering (troostitic or sorbitic transformation), followed by water cooling to room temperature and eddy current testing. Then, the hollow straight tube, having achieved its final properties, undergoes end processing (flattening, drilling, welding), followed by cold bending into a three-dimensional shape using a CNC tube bending machine, and immediately undergoes stress-relief annealing to eliminate residual processing stress. Next, cold straightening is used to calibrate the position of key mounting points, followed by shot peening to improve fatigue life. Finally, coating (cleaning, phosphating, electrostatic spraying, baking) forms a protective layer. This process, by prior heat treatment followed by forming, effectively improves the product's heating uniformity, microstructure, and controls residual stress.

The utility model relates to an angle-adjustable pipe bending die for a square pipe, which belongs to the technical field of pipe bending dies and comprises a mounting frame, a fixing frame fixedly mounted on the lower surface of the mounting frame, a telescopic cylinder mounted on the mounting frame, a mounting seat fixedly mounted at the output end of the telescopic cylinder, and a male die arranged on the mounting seat. A first female die and a second female die are rotationally installed on the installation frame, semicircular plates are arranged on the installation frame and located on the two sides of the first female die, the first female die and the second female die are in sliding connection with the semicircular plates, an electric telescopic rod is hinged to the fixing frame, and the output end of the electric telescopic rod is connected with the first female die and the second female die. Through the electric telescopic rod, the sliding rail, the circular plate, the scale marks, the kidney-shaped hole, the threaded rod and the compression nut, and convenient adjustment of the angle of the female die, the adaptability of equipment to different machining requirements is greatly improved, the position of the female die can be firmly fixed, and it is guaranteed that the female die is always kept stable in the whole machining process.

This utility model relates to the technical field of round tube bending, and in particular to a mandrel-less round tube bending device. When bending a round tube, it can preheat the bending portion, improving the plasticity of the bending portion, reducing its hardness, and preventing cracking during the bending process. It is convenient to use and has high reliability and practicality. The device includes a base plate; it also includes a moving mechanism, a rotating mechanism, a heating mechanism, a clamping mechanism, and a pressing mechanism. The rotating mechanism is mounted on the moving mechanism and is used to move the rotating mechanism left and right. The heating mechanism is mounted on the base plate and has a heating function. The clamping mechanism is located to the right of the heating mechanism, and the pressing mechanism is located to the right of the clamping mechanism and has a pressing function. The heating mechanism is located to the right of the rotating mechanism.

This invention proposes an expansion tube bending and expansion experimental device, relating to the field of oil drilling tool testing. The device includes a base, a support mechanism, and two clamping mechanisms. The two clamping mechanisms are respectively located at both ends of the base, and each clamping mechanism is detachably connected to and fixes the end of the expansion tube. The support mechanism includes multiple support frames mounted on the base, arranged sequentially and at intervals along the length of the base. Each support frame supports the expansion tube and pushes it up and down. The base includes multiple base modules, arranged sequentially along the length of the base and detachably fixedly connected. The expansion tube bending and expansion experimental device proposed in this invention can realistically simulate the expansion process of an expansion tube in a highly inclined curved well section.

The present disclosure discloses a bending angle detection method for tube bending. The detection method includes the following steps: binarizing a to-be-recognized image and extracting a region of interest (ROI) to obtain binary images of two linear segment regions, where the to-be-recognized image is an image of a bent tube; and calculating a bending angle according to the binary images of the two linear segment regions. The present disclosure provides an online method and system for measuring a bending angle based on images, which is cost-effective and has high efficiency and strong universality.

The invention relates to an oil level sensor reed switch pin bending and cutting-off device which comprises a base, a product placement seat is arranged on the base, a rear supporting frame is arranged on the base, a pressing air cylinder is arranged on the rear supporting frame, a pressing plate is arranged on a piston part of the pressing air cylinder, and pressing bending plates are arranged on the left side and the right side of the pressing plate. The pressing bending plates are located on the left side and the right side of the product placement base and matched with the reed switch pins. A group of pressure springs are arranged on one surface, facing the product placement seat, of the lower pressing plate; a reed pipe pressing plate matched with the product placement seat is arranged at the bottoms of the pressure springs; the left side and the right side, located on the product containing base, of the base are each provided with a cutting-off air cylinder, a piston part of each cutting-off air cylinder is provided with a cutter base, and cutters facing the two sides of the product containing base are arranged on the cutter bases. The reed pipe bending and cutting-off device can effectively solve the problems that existing reed pipe bending and cutting-off are achieved in two procedures, the labor cost is high, and the machining efficiency is low.

The utility model discloses a mixer outer tube bending machine relates to mixer outer tube processing technical field, including frame, be provided with the bending roller on the frame, it is through motor rotation setting on the frame, still be provided with two limit rollers on the frame, its rotation setting below the bending roller, be provided with the material guiding mechanism on the lateral wall of frame. The utility model provides a mixer outer tube bending machine, through utilizing material guiding mechanism, when using the bending machine to the plate part used to mixer outer tube carries out processing, can the effect of guiding to plate part, avoid as far as possible when loading to plate part, due to the deflection of plate part, the bending of plate part causes the deviation, thereby the waste condition of plate part occurs, improves the bending effect, can effectively avoid the waste to plate part, improves the bending efficiency of mixer outer tube and the practicality of bending machine.

The utility model discloses a heating pipe bender, which relates to the technical field of pipe benders, and comprises a frame and a centering assembly, the upper end of the frame is provided with a belt conveyor, one end of the belt conveyor is provided with an electric box, one side of the belt conveyor is provided with an arc bending assembly, and the other side of the belt conveyor is provided with an arc bending assembly. Two double-hook bending assemblies are arranged on the other side of the belt conveyor, a feeding assembly is arranged above the double-hook bending assemblies, a discharging assembly is arranged on one side of the feeding assembly, the discharging assembly comprises two alignment frames, the two alignment frames are aligned through a centering assembly, and the two alignment frames are arranged on the other side of the belt conveyor. According to the scheme, the problems that time and labor are wasted, and the flexibility and the machining efficiency are low due to the fact that most of existing electric cooker heating pipes are bent for multiple times through multiple procedures are solved.

This invention discloses a double-cavity tube double-bending die structure, including an inner cavity bending mechanism and an outer cavity bending mechanism. The inner cavity bending mechanism includes a first wheel die, a first clamping die, and a first guiding die. The first wheel die has a first wheel shaft hole and an arc-shaped first tube groove with a semi-circular cross-section. The outer cavity bending mechanism includes a second wheel die, a second clamping die, and a second guiding die. The second wheel die has a second wheel shaft hole and a third tube groove. The double-cavity tube double-bending die structure of this invention uses bending dies to process both the inner and outer cavities. When bending the inner cavity using a tube bending machine, bending radii of different sizes of tubes can be processed, with minimal deformation of the inner and outer cavities. The clamping die provides fixation during inner and outer cavity bending, preventing twisting of the inner and outer cavities. The bending die design is simple, production operation is easy, and processing costs are low.

The invention relates to a pipe bending machine and a bending method, and belongs to the technical field of bending machines, the pipe bending machine comprises a machine body and a rotary motion mechanism, the rotary motion mechanism is connected with a pipe bending eccentric die and a clamping die mechanism, the pipe bending eccentric die and the clamping die mechanism are oppositely arranged, one side of the clamping die mechanism is provided with an auxiliary pushing and guiding die mechanism, and the other side of the clamping die mechanism is provided with an auxiliary pushing and guiding die mechanism. The clamping die mechanism and the auxiliary pushing and guiding die mechanism are sequentially arranged in the length direction of the machine body; the pipe bending eccentric die comprises an eccentric wheel die body which is an eccentric fan-shaped disc, the center position of the eccentric wheel die body deviates from the rotating center of the eccentric wheel die body, and an upper wheel die and a lower wheel die are oppositely arranged on the upper side and the lower side of the eccentric wheel die body. The eccentric wheel die body which is eccentrically arranged enables a pipe to generate translational displacement in the bending radius direction when the pipe is bent, the stable forming requirement of a large-pipe-diameter carbon pipe and a large-section profiled bar is met, forward thrust can be generated through the active axial boosting effect of the auxiliary pushing and guiding die mechanism, and the problem that the wall thickness of the outer side of the pipe is reduced due to stretching is effectively solved.

The utility model provides a novel core rod structure and a bent pipe forming device, relates to the technical field of precise bending of pipes, and solves the technical problems that a core rod is short in service life and difficult to adapt to a small-diameter bent pipe. The novel core rod structure comprises a core rod body, a screw rod body and a ball head assembly, an internal thread cavity and a limiting cavity which are communicated are formed in the core rod body, the screw rod body is in threaded connection with the internal thread cavity, and a spherical limiting groove is formed in the end, facing the limiting cavity, of the screw rod body; the ball head assembly comprises a ball head part, the end of the ball head part is located in the spherical limiting groove, the other part of the ball head part is located in the limiting cavity and can rotate in the spherical limiting groove and the limiting cavity, the structure deforms in the pipe body along with the pipe body, and the ellipse and wrinkles of the pipe body are controlled to be limited within a certain range. The structure is compact, a sleeve is not needed, the screw rod body of a new structure is arranged, the device is particularly suitable for accurate bending forming of small-diameter pipe bodies, and the structural strength is high.