Bending device and method for handlebar tube

Abstract

The present application relates to a bending processing device and method for a handlebar tube, which is applied in the field of handlebar tube processing. The device comprises a frame, a conveying mechanism, a reducing mechanism, and a bending mechanism. The conveying mechanism is fixed to the frame and is used to push the steel tube through the reducing mechanism and the bending mechanism in sequence. The bending mechanism comprises a profiling assembly and a cutting assembly, which are fixed to the frame. The conveying mechanism pushes the steel tube through the cutting assembly and is placed between the profiling assemblies. The reducing mechanism comprises a centering seat and a reducing assembly, which is rotatably connected to the centering seat. The centering seat has a centering hole for the steel tube to pass through. The reducing assembly is coaxially arranged with the centering hole. The conveying mechanism pushes the steel tube through the centering hole and into the reducing assembly. The present application has the effect of continuously processing handlebar tubes and improving processing efficiency.

Description

Technical Field

[0001] The present application relates to the field of handlebar tube processing, and in particular to a handlebar tube bending processing device and a handlebar tube bending processing method. Background Art

[0002] The handlebar tube is one of the necessary parts for motorcycle assembly and is generally made of a reduced diameter steel tube through bending.

[0003] One method for processing handlebar tubes involves first extruding a steel tube into a tapered tube with tapered ends and a thicker center. This tube is then fed into a bending machine for bending. Extrusion and bending are two separate processes, and the tube must be transported between them for processing.

[0004] With respect to the above-mentioned related technologies, the inventors have found the following defects: since the steel pipe needs to be transferred between the extrusion diameter-changing device and the bending machine during processing, the production efficiency of the handlebar tube is low. Summary of the Invention

[0005] In order to improve the problem of low production efficiency of handlebar tubes, the present application provides a bending processing device and a bending processing method for handlebar tubes.

[0006] In a first aspect, the present application provides a handlebar tube bending device, which adopts the following technical solution:

[0007] A handlebar tube bending device comprises a frame, a conveying mechanism, a diameter-changing mechanism and a bending mechanism, wherein the conveying mechanism is fixed on the frame and is used to push the steel tube through the diameter-changing mechanism and the bending mechanism in sequence;

[0008] The bending mechanism includes a profiling assembly and a cutting assembly, the profiling assembly and the cutting assembly are fixed on the frame, and the conveying mechanism pushes the steel pipe through the cutting assembly and is placed between the profiling assemblies;

[0009] The reducing mechanism includes a centering seat and a reducing assembly. The reducing assembly is rotatably connected to the centering seat. A centering hole is provided on the centering seat for the steel pipe to pass through. The reducing assembly is coaxially arranged with the centering hole. The conveying mechanism pushes the steel pipe through the centering hole and inserts it into the reducing assembly.

[0010] By adopting the above technical solution, the entire steel pipe is directly pushed by the conveying mechanism to undergo diameter reduction and bending in sequence, thereby completing the shaping of the handlebar pipe. There is no need to cut to length and transfer it separately in the middle, and the handlebar pipe can be processed continuously, thereby achieving the purpose of improving processing efficiency.

[0011] Optionally, the profiling assembly includes a lower die, an upper die and a pushing part fixed on a frame, the upper die is placed above the lower die and is driven by a linear drive device fixed on the frame to move toward the lower die, the steel pipe is placed on the lower die, the pushing parts are placed on both sides of the lower die, and the pushing shaft of the pushing part pushes the steel pipe to move obliquely upward.

[0012] By adopting the above technical solution, when the steel pipe is conveyed to the lower die, it is pressed into a handlebar tube blank by the upper die. The pushing part is used to push the blank obliquely upward and deform it. During the pushing process, the upper die and the lower die cooperate to ensure that the steel pipe is always in a fixed state, thereby avoiding abnormal movement of the steel pipe during the pushing process and making the processing more precise.

[0013] Optionally, the upper mold is fixed on the side of the upper mold facing the lower mold, and an upper mold groove is opened on the upper mold for placing the steel pipe. The lower mold is fixed on the side of the lower mold facing the upper mold, and a lower mold groove is opened on the lower mold for placing the steel pipe. After the upper mold and the lower mold are closed, the steel pipe is placed between the upper mold groove and the lower mold groove.

[0014] By adopting the above technical solution, when the upper mold is pressed down, the steel pipe is placed in the lower mold groove and a corresponding upper mold groove is opened on the upper mold. Therefore, when pressing down, a position for accommodating the steel pipe can be formed, which can not only form the steel pipe but also prevent the steel pipe from being deformed by the force of the upper and lower molds, thereby reducing the defective rate.

[0015] Optionally, the pushing part includes a pushing cylinder and a push plate, a clearance groove is provided on the lower die, the pushing cylinder is fixed on the frame, the push plate is fixed on the pushing shaft of the pushing cylinder, the push plate is driven by the pushing cylinder to move back and forth in the clearance groove, and a limit groove for placing the steel pipe is provided on the push plate.

[0016] By adopting the above technical solution, when the pushing part pushes the steel pipe, the steel pipe is engaged in the limiting groove, and the steel pipe is limited during the pushing process, so that the steel pipe will not slip during the pushing process, thereby improving the processing accuracy and reducing the defective rate.

[0017] Optionally, the cutting assembly is arranged on the side of the lower die close to the diameter-changing assembly, and the cutting assembly includes a mounting seat, a motor and a saw blade. The mounting seat is hinged on the lower die, a pressure arm is fixed on the mounting seat, and the saw blade is rotatably connected to the mounting seat, a motor is fixed on the mounting seat, the motor drives the saw blade to rotate, and the pressure arm drives the saw blade close to or away from the lower die.

[0018] By adopting the above technical solution, the steel pipe can be cut by pushing the saw blade before the upper mold and the lower mold are pressed into shape. The steel pipe has been reduced in diameter before cutting, and a single handlebar tube blank is formed after cutting. At this time, the upper mold and the lower mold are pressed together to press the handlebar tube blank into shape. The pressing process will not affect the subsequent steel pipes, and will not affect the subsequent processing of the steel pipes, so that the quality of the processing process is more uniform, and the quality of the finished product is improved.

[0019] Optionally, the reducing assembly includes an upper heating seat and a lower heating seat for heating the steel pipe, the upper heating seat is placed above the lower heating seat, and the frame is respectively provided with an upper cylinder and a lower cylinder, the upper cylinder drives the upper heating seat to move toward the lower heating seat, and the lower cylinder drives the lower heating seat to move toward the upper heating seat;

[0020] An upper half groove is provided on the side of the upper heating seat opposite to the lower heating seat, and a lower half groove is provided on the side of the lower heating seat opposite to the upper heating seat. When the upper heating seat and the lower heating seat are in contact with each other, the upper half groove and the lower half groove form a heating hole for the steel pipe to pass through, and the heating hole gradually shrinks along the moving direction of the steel pipe.

[0021] By adopting the above technical solution, the steel pipe can be heated to a semi-molten state when passing through the heating hole formed by the bonding of the upper heating seat and the lower heating seat. As the diameter of the heating hole shrinks, the steel pipe is re-plasticized to change its diameter. When the diameter change is not required, the upper heating seat and the lower heating seat can move away from each other, thereby not affecting the subsequent movement of the steel pipe. At the same time, when the diameter change is required again, they can be easily moved close to each other, thereby realizing continuous diameter change processing of the steel pipe, thereby realizing continuous processing of the handlebar tube and improving processing efficiency.

[0022] Optionally, a cavity is provided in the upper heating seat and the lower heating seat, a heating resistor is provided in the cavity, a heat conducting medium is filled in the cavity, and the heating part heats the upper heating seat and the lower heating seat through the heat conducting medium.

[0023] By adopting the above technical solution, the heat-conducting medium is heated by the heating resistor, so that the upper heating seat and the lower heating seat are heated more evenly, thereby making the quality of the finished product more balanced and improving the quality of the finished product.

[0024] Optionally, the conveying mechanism includes a pushing component and a placement rack for placing the steel pipe, the placement rack is placed on one side of the frame, and the pushing component is fixed on the frame;

[0025] The placement rack includes a column and a cross plate, the cross plate is fixed on the column and extends perpendicular to the column toward the frame, the steel pipe is placed on the cross plate, the end of the cross plate away from the frame is higher than the end close to the frame, and a placement groove is provided on the side of the cross plate close to the frame. The steel pipe rolls on the cross plate toward the frame and is placed in the placement groove, and the pushing assembly pushes the steel pipe in the placement groove to pass through the reducing mechanism and the bending mechanism in sequence.

[0026] By adopting the above technical solution, the steel pipes are arranged in sequence on the placement rack, and a placement slot is opened on the placement rack, so that only one steel pipe is in the placement slot at a time to facilitate pushing by the pushing component. At the same time, the placement rack is inclined, and after the processing of a steel pipe is completed, the steel pipe can automatically roll into the placement slot, so that the pushing component can continuously push the steel pipe, thereby improving processing efficiency.

[0027] Optionally, the pushing assembly includes a rail, a slider, a fixed seat and a thimble fixed on the frame, the slider slides on the rail, the slider is provided with an extension plate, the extension plate extends toward the placement frame, a lifting cylinder is fixed on the extension plate, the lifting axis of the lifting cylinder passes through the extension plate and is connected to the fixed seat, a thimble is provided on the end face of the fixed seat facing the frame, the lifting cylinder drives the thimble to be coaxial with the steel pipe placed in the placement slot, and the thimble is driven by the slider to be inserted into the steel pipe.

[0028] By adopting the above technical solution, the ejector pin is inserted into the steel pipe during the pushing process, which can limit the steel pipe in the pushing process and reduce the possibility of the steel pipe falling during the pushing process.

[0029] In a second aspect, the present application provides a method for bending a handlebar tube, which adopts the following technical solution:

[0030] A method for bending a handlebar tube is implemented using a handlebar tube bending device, comprising the following steps:

[0031] In the steel pipe discharging step, several steel pipes are laid flat on the placement rack and rolled along the inclined surface of the placement rack until one steel pipe rolls into the placement groove, and the other steel pipes are arranged on the placement rack in sequence;

[0032] In the steel pipe pushing step, the lifting cylinder drives the ejector pin to move up and down to adjust the height of the ejector pin until the ejector pin is coaxial with the steel pipe in the placement groove. Then the slider slides on the track, driving the ejector pin to insert into the steel pipe. As the slider moves on the slide rail, it pushes the steel pipe to move toward the diameter reducing mechanism.

[0033] In the steel pipe diameter reducing step, the slider pushes the steel pipe into the heating hole, the upper heating seat and the lower heating seat are close to the outer wall of the steel pipe, and the steel pipe is heated to a semi-molten state. As the ejector moves forward, the steel pipe enters from the large diameter of the heating hole and is squeezed out from the small diameter, and the steel pipe is squeezed and reduced in diameter. As the steel pipe moves, the upper heating seat and the lower heating seat are separated after the diameter is reduced to a predetermined length. The steel pipe cools and no longer changes in diameter until the upper heating seat and the lower heating seat are re-adapted when the diameter needs to be reduced next time, and the steel pipe is heated and reduced in diameter again;

[0034] In the steel pipe forming step, as the steel pipe is continuously pushed, part of the steel pipe is placed on the lower die, and then the pushing of the steel pipe is stopped, and the steel pipe is cut by the saw blade. Then the upper die is pressed down and the steel pipe is bent. After bending, the pushing part pushes the steel pipe on the lower die to form a finished handlebar tube. After taking out the finished handlebar tube, the above steps are repeated until the entire steel pipe is processed into a finished handlebar tube.

[0035] By adopting the above technical solution, the entire steel pipe is directly pushed by the conveying mechanism to undergo diameter reduction and bending in sequence, thereby completing the shaping of the handlebar pipe. There is no need to cut to length and transfer it separately in the middle, and the handlebar pipe can be processed continuously, thereby achieving the purpose of improving processing efficiency.

[0036] In summary, this application has at least one of the following beneficial effects:

[0037] 1. The entire steel pipe is directly pushed by the conveying mechanism to the process of diameter reduction and bending in sequence, thus completing the shaping of the handlebar pipe. There is no need to cut to length and transfer the pipe separately in the middle, and the handlebar pipe can be processed continuously, thereby achieving the purpose of improving processing efficiency;

[0038] 2. The heating hole is formed after the upper heating seat and the lower heating seat are fitted together. When the steel pipe passes through the heating hole, it can be heated to a semi-molten state. As the diameter of the heating hole shrinks, the steel pipe is re-plasticized to change its diameter. When the diameter change is not needed, the upper heating seat and the lower heating seat can move away from each other, so it will not affect the subsequent movement of the steel pipe. At the same time, when the diameter change is needed again, they can be easily moved close to each other, which can realize the continuous diameter change processing of the steel pipe, thereby realizing the continuous processing of the handlebar tube and improving the processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic structural diagram of a handlebar tube bending device according to an embodiment of the present application;

[0040] Figure 2 This is a schematic structural diagram of a pushing assembly of a handlebar tube bending processing device in an embodiment of the present application;

[0041] Figure 3 A schematic diagram illustrating the connection relationship between the fixing base, the extension plate, and the ejector pin of the handlebar tube bending device in an embodiment of the present application;

[0042] Figure 4 This is a structural schematic diagram of a diameter-reducing mechanism of a handlebar tube bending processing device in an embodiment of the present application;

[0043] Figure 5 This is a schematic cross-sectional view of the internal structure of the diameter-reducing mechanism of the handlebar tube bending processing device in an embodiment of the present application;

[0044] Figure 6 This is a structural schematic diagram of a bending mechanism of a handlebar tube bending processing device in an embodiment of the present application;

[0045] In the figure: 1. Frame; 2. Conveying mechanism; 21. Pushing assembly; 211. Track; 212. Slider; 213. Fixed seat; 214. Ejector pin; 215. Extension plate; 216. Lifting cylinder; 22. Placement rack; 221. Column; 222. Cross plate; 223. Placement slot; 3. Variable diameter mechanism; 31. Centering seat; 311. Centering hole; 312. Ball bearing; 313. Ball groove; 32. Variable diameter assembly; 321. Upper heating seat; 322. Upper cylinder; 323. Lower heating seat; 324. Lower cylinder; 32 5. Heating hole; 3251. Upper half groove; 3252. Lower half groove; 326. Cavity; 4. Bending mechanism; 41. Pressing assembly; 411. Lower die; 4111. Lower die; 4112. Lower die groove; 4113. Giving way groove; 412. Upper die; 4121. Upper die; 4122. Upper die groove; 413. Pushing part; 4131. Pushing cylinder; 4132. Push plate; 4133. Limiting groove; 42. Cutting assembly; 421. Mounting seat; 422. Motor; 423. Saw blade; 424. Pressing arm. DETAILED DESCRIPTION

[0046] The following is combined with Figures 1-6 This application is described in further detail.

[0047] The embodiment of the present application discloses a bending processing device for a handlebar tube. Figure 1 A handlebar tube bending device includes a conveying mechanism 2 for conveying steel tubes, which is fixed to a frame 1. The conveying mechanism 2 includes a push assembly 21 and a placement rack 22. The placement rack 22 is fixed to one side of the frame 1, and the steel tube is placed on the placement rack 22. The placement rack 22 is composed of a column 221 and a cross plate 222. The cross plate 222 is inclined toward the frame 1 to form a slope. When the steel tube is placed on the cross plate 222, it can automatically roll toward the frame 1. The cross plate 222 has a placement groove 223, and the steel tube can roll into the placement groove 223 when rolling, so that it can be transported by the push assembly 21.

[0048] Reference Figure 2 and Figure 3The push assembly 21 includes a track 211, a slider 212, a fixed seat 213, and a pin 214. The track 211 runs along the length of the frame 1. The slider 212 slides on the track 211. An extension plate 215 extends outward from the slider 212 for mounting a lifting cylinder 216. The lifting shaft of the lifting cylinder 216 passes through the extension plate 215 and extends toward the steel pipe. The fixed seat 213 is mounted on the lifting shaft, and the pin 214 is mounted on the fixed seat 213. The pin 214 runs along the length of the frame 1. This allows the lifting cylinder 216 to push the pin 214 up or down to align it with the steel pipe in the placement slot 223. When pushed, the pin 214 is inserted into the steel pipe. When the slider 212 moves along the track 211, it pushes the steel pipe along the length of the frame 1 until it is pushed into the reducing mechanism 3 for diameter reduction. A clearance hole can be provided in the portion of the frame 1 that interferes with the steel pipe to facilitate the passage of the steel pipe.

[0049] Reference Figure 4 and Figure 5 The reducing mechanism 3 includes a centering seat 31 and a reducing assembly 32. The centering seat 31 is fixed to the frame 1 and has a centering hole 311. The steel pipe is first aligned through the centering hole 311 before being pushed into the reducing assembly 32 by the slider 212 to ensure that the steel pipe is coaxial with the reducing assembly 32 before entering the reducing assembly 32. Ball bearings 312 for limiting the position are evenly distributed on the side walls of the centering hole 311 along the circumferential direction of the centering hole 311. Ball bearing grooves 313 are provided on the side walls of the centering hole 311. The balls 312 are engaged in the ball bearing grooves 313 and can roll in the ball bearing grooves 313. When the steel pipe passes through, the outer wall of the balls 312 contacts the steel pipe. Driven by the steel pipe, the balls 312 roll in the ball bearing grooves 313, which can both play a positioning role and not affect the continuous movement of the steel pipe.

[0050] Reference Figure 4 and Figure 5, a heating hole 325 is provided on the reducing assembly 32, and the heating hole 325 gradually shrinks along the forward direction of the steel pipe. During the diameter reduction process, the steel pipe is pushed by the slider 212, thereby passing through the gradually shrinking reducing hole to complete the diameter reduction. The reducing assembly 32 can be composed of an upper heating seat 321 and a lower heating seat 323, an upper half groove 3251 is provided on the upper heating seat 321, and a lower half groove 3252 is provided on the lower heating seat 323, and an upper cylinder 322 and a lower cylinder 324 are fixed on the frame 1 at the same time, the upper cylinder 322 is used to drive the upper heating seat 321, and the lower cylinder 324 is used to drive the lower heating seat 323, so that the upper heating seat 321 and the lower heating seat 323 can approach or move away from each other. Each formed handlebar tube undergoes two diameter reductions. Therefore, in the portion of the handlebar tube that does not require diameter reduction, the upper heating seat 321 and the lower heating seat 323 can move away from each other to make way, allowing the slider 212 to push the portion of the tube that requires diameter reduction through the reducing assembly 32. When the tube needs to be heated and reduced in diameter, the upper heating seat 321 and the lower heating seat 323 move closer together until they fit together, allowing the upper half groove 3251 and the lower half groove 3252 to combine to form a heating hole 325 for heating the tube. This allows the tube to be heated by both the upper heating seat 321 and the lower heating seat 323 to form a semi-molten state and be pushed out of the smaller side of the heating hole 325, completing the diameter reduction. During the diameter reduction process, the tube moves forward, and the driving force pushes the tube out of the heating hole 325, completing the diameter reduction.

[0051] Reference Figure 4 and Figure 5 A cavity 326 is defined within the upper heating seat 321 and the lower heating seat 323. A heating resistor is placed within the cavity 326 to heat the upper heating seat 321 and the lower heating seat 323. The heating resistor is fixed to the sidewall of the cavity 326. The cavity 326 can be filled with a heat-conducting medium, such as thermal oil. The heating resistor does not directly heat the upper heating seat 321 or the lower heating seat 323. Instead, the heating resistor heats the thermal oil, which acts as an intermediate medium to heat the upper heating seat 321 and the lower heating seat 323, thereby heating the upper heating seat 321 and the lower heating seat 323 more evenly.

[0052] Reference Figure 4 and Figure 5After the diameter change is completed, the steel pipe continues to move forward. When the portion of the steel pipe that does not need to be reduced in diameter passes through the diameter reducing assembly 32, the upper heating seat 321 and the lower heating seat 323 separate from each other, so that the upper and lower heating seats 323 no longer form the heating hole 325, which facilitates the passage of the portion of the steel pipe that does not need to be reduced in diameter. When the steel pipe needs to be reduced in diameter again, the upper cylinder 322 drives the upper heating seat 321, and the lower cylinder 324 drives the lower heating seat 323 to press against each other again, so that the upper heating seat 321 and the lower heating seat 323 press against the outer wall of the steel pipe again and reheat the steel pipe to a molten state. At the same time, the slider 212 slides to push the steel pipe out of the small end of the heating hole 325 to complete the diameter change.

[0053] Reference Figure 6 , after the diameter is changed, it continues to move forward with the steel pipe, and the steel pipe reaches the bending mechanism 4 for bending and forming. The bending mechanism 4 includes a profiling component 41 and a cutting component 42. The cutting component 42 is placed between the diameter-changing component 32 and the profiling component 41 and is fixed on the lower die 411. The profiling component 41 includes an upper die 412, a lower die 411 and a pushing part 413. The upper die 412 and the lower die 411 are both fixed on the frame 1. The steel pipe is pushed onto the lower die 411 by the slider 212. The upper die 412 is driven by a linear drive device fixed on the frame 1 above the lower die 411 to move in the direction of the lower die 411, and is closed with the lower die 411, thereby completing the profiling of the steel pipe. An upper die 4121 is fixed to the upper die 412, and a lower die 4111 is fixed to the lower die 411. To prevent the tubular structure of the steel pipe from being affected during profiling, an upper die groove 4122 is provided on the upper die 4121, and a lower die groove 4112 is provided on the lower die 4111. After the upper die 412 and the lower die 411 are closed, the steel pipe is placed between the upper die groove 4122 and the lower die groove 4112. The cutting assembly 42 is activated to cut the steel pipe only after the upper die 412 and the lower die 411 are closed. The closing of the upper die 412 and the lower die 411 limits the steel pipe, preventing abnormal movement of the steel pipe, thereby enabling the steel pipe to be accurately cut to equal lengths.

[0054] Reference Figure 6 The cutting assembly 42 includes a mounting base 421, a motor 422, and a saw blade 423. The mounting base 421 is hinged on the lower die 411, a pressure arm 424 is fixed on the mounting base 421, and the saw blade 423 is rotatably connected to the mounting base 421. The motor 422 fixed to the mounting base 421 drives the saw blade 423 to rotate, and pressing the pressure arm 424 downward drives the saw blade 423 to move downward, so that the saw blade 423 contacts the steel pipe to cut the steel pipe.

[0055] The steel pipe can only be pushed and shaped by the pushing part 413 after it is cut. Whether in the cutting process or in the shaping process pushed by the pushing part 413, the upper die 412 and the lower die 411 are in a mold-clamped state to limit the steel pipe. A clearance groove 4113 is opened on the lower die 411, and the pushing part 413 is placed in the clearance groove 4113. The pushing part 413 includes a pushing cylinder 4131 and a push plate 4132. The push plate 4132 is driven by the pushing cylinder 4131 to move back and forth in the clearance groove 4113. The pushing cylinder 4131 is fixed on the frame 1. The axial direction of the pushing cylinder 4131 extends in the clearance groove 4113 and is placed in the clearance groove 4113. There is an angle between the pushing cylinder 4131 and the plane where the bottom of the clearance groove 4113 is located, so as to be able to drive the push plate 4132 to move obliquely upward. When the steel pipe needs to be shaped, the push plate 4132 is used to push the steel pipe forward to deform. A limiting groove 4133 is provided on the push plate 4132. When the push plate 4132 contacts the steel pipe, the steel pipe is engaged in the limiting groove 4133 to play a guiding and limiting role.

[0056] A handlebar tube bending processing device provided in an embodiment of the present application uses the cooperation of a slider 212 and an ejector pin 214 to push the steel tube forward along the direction of the track 211, thereby realizing continuous feeding during the production of the handlebar tube. During the continuous feeding process, the diameter change is realized by the cooperation of the upper heating seat 321 and the lower heating seat 323, and the upper heating seat 321 and the lower heating seat 323 can be separated, so that the steel tube can be changed in diameter at the required part, thereby realizing the diameter change processing of the handlebar tube. After the diameter change processing, it can enter the pressure forming between the upper die seat and the lower die seat under the continuous push of the ejector pin 214 and the slider 212. During the processing, there is no need to cut to length and transfer separately, and the handlebar tube can be processed continuously, thereby improving the processing efficiency of the handlebar tube.

[0057] The embodiment of the present application also provides a method for bending a handlebar tube. The bending device of the handlebar tube in the embodiment of the present application is implemented by laying a plurality of steel tubes flat on a placement rack 22. The steel tubes can roll along the placement rack 22. One of the steel tubes rolls into the placement groove 223, so that the slide block 212 slides and drives the ejector pin 214 to push the steel tube and move it along the frame 1. The following describes in detail how to process a long steel tube into a handlebar tube.

[0058] First, the lifting cylinder 216 drives the ejector pin 214 to move up and down to adjust the height of the ejector pin 214 until the ejector pin 214 is coaxial with the steel pipe in the placement groove 223. Then the slider 212 slides on the track 211, driving the ejector pin 214 to insert into the steel pipe. As the slider 212 moves on the slide rail, the steel pipe is pushed to move toward the diameter-changing mechanism 3. During the entire processing process, the ejector pin 214 always remains inserted into the steel pipe to push the steel pipe forward, so as to complete the pushing of the steel pipe during the entire processing process.

[0059] Secondly, as the slider 212 continues to move, the steel pipe is pushed to the diameter-changing mechanism 3 for diameter change. The steel pipe is first centered through the centering hole 311 so that it can be accurately inserted into the heating hole 325 and heated to a molten state. As the slider 212 continues to move, the steel pipe passes through the centering hole 311, and the outer wall of the steel pipe contacts the ball 312. The ball 312 is used to push the outer wall of the steel pipe to achieve a limiting effect, and at the same time, the ball 312 rolls to reduce friction.

[0060] Once again, the steel pipe enters the reducing assembly 32 and is heated to a molten state by the reducing assembly 32. At the same time, the slider 212 drives the ejector pin 214 to continue pushing the steel pipe so that the steel pipe passes through the heating hole 325 on the reducing assembly 32 to achieve diameter change. The pipe handle only needs to be reduced in diameter at both ends. Therefore, after the diameter is reduced to a certain length, the upper heating seat 321 and the lower heating seat 323 are separated from each other, and the steel pipe is no longer heated, so that the steel pipe can pass through the reducing assembly 32 without changing its diameter. When the diameter needs to be reduced again, the upper heating seat 321 and the lower heating seat 323 are pressed against each other, and the steel pipe is reheated to reduce its diameter again. In this process, since the steel pipe is constantly moving, the length of the diameter change can be controlled by controlling the time when the upper heating seat 321 and the lower heating seat 323 separate and press against each other.

[0061] As the steel pipe continues to move, it is transported to the lower die 411, and both sections of the reducer are placed on the lower die 411. After the upper die 412 directly presses down to form the steel pipe, the downward pressing saw blade 423 is operated to cut the steel pipe. Alternatively, the saw blade 423 can be used to cut the steel pipe first, and then the upper die 412 is used to press down to form the steel pipe. The pushing part 413 can only push the steel pipe after it is cut to form the finished handlebar pipe. After the finished handlebar pipe is removed, the above steps are repeated until the entire steel pipe is processed into a finished handlebar.

[0062] During the entire processing process, the ejector pin 214 can push the steel pipe to move intermittently, thereby realizing uninterrupted processing of the handlebar pipe, reducing the transfer process between diameter change and forming, saving time, and improving processing efficiency.

[0063] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A handlebar tube bending device, comprising a frame (1), a conveying mechanism (2), a diameter-changing mechanism (3) and a bending mechanism (4), characterized in that: The conveying mechanism (2) is fixed on the frame (1) and is used to push the steel pipe to pass through the diameter-changing mechanism (3) and the bending mechanism (4) in sequence; The bending mechanism (4) comprises a profiling assembly (41) and a cutting assembly (42), wherein the profiling assembly (41) and the cutting assembly (42) are fixed on the frame (1), and the conveying mechanism (2) pushes the steel pipe through the cutting assembly (42) and is placed between the profiling assemblies (41); The diameter-reducing mechanism (3) comprises a centering seat (31) and a diameter-reducing assembly (32); the diameter-reducing assembly (32) is connected to the centering seat (31); a centering hole (311) for the steel pipe to pass through is provided on the centering seat (31); the diameter-reducing assembly (32) and the centering hole (311) are coaxially arranged; the conveying mechanism (2) pushes the steel pipe through the centering hole (311) and inserts into the diameter-reducing assembly (32); The reducing assembly (32) comprises an upper heating seat (321) and a lower heating seat (323) for heating the steel pipe, the upper heating seat (321) being placed above the lower heating seat (323), and an upper cylinder (322) and a lower cylinder (324) being respectively provided on the frame (1), the upper cylinder (322) driving the upper heating seat (321) to move toward the lower heating seat (323), and the lower cylinder (324) driving the lower heating seat (323) to move toward the upper heating seat (321); An upper half groove (3251) is provided on the side opposite to the upper heating seat (321) and the lower heating seat (323), and a lower half groove (3252) is provided on the side opposite to the upper heating seat (321). When the upper heating seat (321) and the lower heating seat (323) are in contact with each other, the upper half groove (3251) and the lower half groove (3252) form a heating hole (325) for the steel pipe to pass through. The heating hole (325) gradually shrinks along the moving direction of the steel pipe. During the diameter change process, the steel pipe is pushed, thereby The steel pipe is passed through the hole to complete the diameter change; the profiling assembly (41) includes a lower die (411), an upper die (412) and a pushing portion (413) fixed on the frame (1); the upper die (412) is placed above the lower die (411) and is driven by a linear drive device fixed on the frame (1) to move toward the lower die (411); the steel pipe is placed on the lower die (411); the pushing portion (413) is placed on both sides of the lower die (411); and the pushing shaft of the pushing portion (413) pushes the steel pipe to move obliquely upward.

2. The handlebar tube bending device according to claim 1, characterized in that: The upper die (4121) is fixed on the side of the upper die (412) facing the lower die (411), and an upper die groove (4122) for placing the steel pipe is provided on the upper die (4121). The lower die (4111) is fixed on the side of the lower die (4111) facing the upper die (412), and a lower die groove (4112) for placing the steel pipe is provided on the lower die (4111). After the upper die (412) and the lower die (4111) are clamped, the steel pipe is placed between the upper die groove (4122) and the lower die groove (4112).

3. The handlebar tube bending device according to claim 2, characterized in that: The pushing portion (413) includes a pushing cylinder (4131) and a push plate (4132); a clearance groove (4113) is provided on the lower die (411); the pushing cylinder (4131) is fixed on the frame (1); the push plate (4132) is fixed on the pushing shaft of the pushing cylinder (4131); the pushing plate (4132) is driven by the pushing cylinder (4131) to reciprocate in the clearance groove (4113); and a limiting groove (4133) for placing a steel pipe is provided on the pushing plate (4132).

4. The handlebar tube bending device according to claim 3, characterized in that: The cutting assembly (42) is arranged on a side of the lower die (411) close to the diameter-changing assembly (32), and the cutting assembly (42) comprises a mounting seat (421), a motor (422) and a saw blade (423). The mounting seat (421) is hinged on the lower die (411), a pressure arm (424) is fixed on the mounting seat (421), and the saw blade (423) is rotatably connected to the mounting seat (421). The motor (422) is fixed on the mounting seat (421), and the motor (422) drives the saw blade (423) to rotate, and the pressure arm (424) drives the saw blade (423) to approach or move away from the lower die (411).

5. The handlebar tube bending device according to claim 4, characterized in that: A cavity (326) is provided in the upper heating seat (321) and the lower heating seat (323), a heating resistor is provided in the cavity (326), a heat-conducting medium is filled in the cavity (326), and the heating resistor heats the upper heating seat (321) and the lower heating seat (323) through the heat-conducting medium.

6. The handlebar tube bending device according to claim 5, characterized in that: The conveying mechanism (2) comprises a pushing assembly (21) and a placement rack (22) for placing steel pipes, the placement rack (22) is placed on one side of the frame (1), and the pushing assembly (21) is fixed on the frame (1); The placement rack (22) includes a column (221) and a transverse plate (222), wherein the transverse plate (222) is fixed on the column (221) and extends perpendicularly to the column (221) in the direction of the frame (1), and the steel pipe is placed on the transverse plate (222), and the end of the transverse plate (222) away from the frame (1) is higher than the end close to the frame (1), and a placement groove (223) is provided on the side of the transverse plate (222) close to the frame (1), and the steel pipe rolls on the transverse plate (222) in the direction of the frame (1) and is placed in the placement groove (223), and the pushing component (21) pushes the steel pipe in the placement groove (223) to pass through the diameter-changing mechanism (3) and the bending mechanism (4) in sequence.

7. The handlebar tube bending device according to claim 6, characterized in that: The pushing assembly (21) comprises a track (211), a slider (212), a fixing seat (213) and a thimble (214) fixed on the frame (1); the slider (212) slides on the track (211); an extension plate (215) is provided on the slider (212); the extension plate (215) extends toward the placement frame (22); a lifting cylinder (216) is fixed on the extension plate (215); a lifting shaft of the lifting cylinder (216) passes through the extension plate (215) and is connected to the fixing seat (213); a thimble (214) is provided on the end surface of the fixing seat (213) facing the frame (1); the lifting cylinder (216) drives the thimble (214) to be coaxial with a steel pipe placed in the placement groove (223); and the thimble (214) is driven by the slider (212) to be inserted into the steel pipe.

8. A method for bending a handlebar tube, characterized in that: The bending processing device for a handlebar tube according to claim 7 is implemented by using the following steps: In the steel pipe discharging step, a plurality of steel pipes are laid flat on the placement rack (22) and rolled along the inclined surface of the placement rack (22) until one steel pipe rolls into the placement groove (223), and the other steel pipes are arranged on the placement rack (22) in sequence; In the steel pipe pushing step, the lifting cylinder (216) drives the ejector pin (214) to move up and down to adjust the height of the ejector pin (214) until the ejector pin (214) is coaxial with the steel pipe in the placement groove (223), and then the slider (212) slides on the track (211), driving the ejector pin (214) to be inserted into the steel pipe, and as the slider (212) moves on the slide rail, the steel pipe is pushed to move toward the diameter-changing mechanism (3); In the steel pipe diameter reduction step, the slider (212) pushes the steel pipe into the heating hole (325), the upper heating seat (321) and the lower heating seat (323) are in close contact with the outer wall of the steel pipe, and the steel pipe is heated to a semi-molten state. As the ejector pin (214) moves forward, the steel pipe enters from the large diameter of the heating hole (325) and is squeezed out from the small diameter, and the steel pipe is squeezed and reduced in diameter. As the steel pipe moves, after the diameter is reduced to a predetermined length, the upper heating seat (321) and the lower heating seat (323) are separated. The steel pipe cools and does not change in diameter any more until the upper heating seat (321) and the lower heating seat (323) are re-contacted when the diameter needs to be reduced next time, and the steel pipe is heated and reduced in diameter again. In the steel pipe forming step, the steel pipe is placed on the lower die (411) as the steel pipe is continuously pushed by the pushing part (413), and then the pushing of the steel pipe is stopped, and the steel pipe is cut by the saw blade (423), and then the upper die (412) is pressed down to bend the steel pipe. After bending, the pushing part (413) pushes the steel pipe on the lower die (411) to form a finished handlebar pipe. After the finished handlebar pipe is taken out, the steel pipe pushing step, the steel pipe forming step and the step are repeated until the entire steel pipe is processed into a finished handlebar pipe.

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