Numerical control pipe bending assembly and pipe bending machine for air conditioner pipe processing

Abstract

The application discloses a numerical control pipe bending assembly for air conditioner pipe machining and a pipe bending machine, and relates to the technical field of pipe machining.The control structure composed of the spline table, the electromagnet and the rotating seat is arranged, so that the die wheel and the cantilever and the U-shaped frame body can be selectively locked according to the machining requirement, thereby changing the relative movement relationship between the die wheel and the die core, and enabling the same set of pipe bending assembly to realize drawing type bending, extrusion type bending and intermittent composite type bending under different control states.Compared with the traditional pipe bending equipment in which the die movement mode is fixed and only single rotation or one-way extrusion can be relied on to complete the pipe bending machining mode, the scheme can actively adjust the movement state between the die wheel and the die core, the stress process of the pipe is more flexible, the corresponding bending mode can be selected for the pipe body with different materials, different wall thicknesses and different bending radii, and the adaptation ability of the equipment to the complex pipe machining requirement is improved.

Description

Technical Field

[0001] This invention relates to the field of pipe processing technology, and in particular to CNC pipe bending components and pipe bending machines for air conditioning pipe processing. Background Technology

[0002] In the prior art, air conditioning pipes, refrigeration pipes and similar thin-walled metal pipes usually need to undergo bending and forming processes during processing to meet the requirements of internal space layout and fluid transport path design.

[0003] However, the movement of the molds in existing pipe bending equipment is usually quite fixed. Most of them use the rotation of the mold wheel to drive the pipe to deflect around a fixed bending center, or use the unidirectional movement of the pressure die to extrude and shape the pipe. In actual processing, this type of structure can usually only form a single type of bending action. When processing pipes of different materials, wall thicknesses, or bending radii, it is impossible to adjust the stress mode during the bending process according to the deformation characteristics of the pipe itself, which limits the applicability of the equipment.

[0004] In particular, in existing bending structures, the pressure block, pipe, and fixed die typically rely on pure friction or simple roller guidance for transmission. Under enormous bending resistance, slight relative slippage inevitably occurs between the pressure block and the pipe, and there is also the problem of localized over-compression, which leaves severe scratches and abrasions on the surface of the soft air conditioning pipe. Summary of the Invention

[0005] The purpose of this invention is to address the problems of traditional bending methods being relatively simple, making it difficult to coordinate specific pipe materials and specifications for rapid adaptation to production processes, and the current extrusion bending structure being prone to local over-extrusion causing scratches on the pipe surface. This invention proposes a CNC pipe bending assembly and pipe bending machine for air conditioning pipe processing.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a CNC pipe bending assembly for processing air conditioning pipes, comprising a cantilever and a fixed mold structure mounted thereon, and a moving mold structure for extrusion on one side of the fixed mold structure, wherein the fixed mold structure includes a mold wheel and a control structure mounted at the bottom end of the mold wheel, and a drive shaft axially rotatably passes through the mold wheel; The moving mold structure includes a U-shaped frame mounted on a drive shaft, and a pressure bearing pair is slidably mounted on the U-shaped frame. A mold core that meshes with a mold wheel is horizontally limited and slidably mounted on the pressure bearing pair. The control structure includes a rotating seat that frictionally contacts the bottom of the die wheel. The rotating seat has a splined platform that is vertically raised and lowered by electromagnetic force. When the splined platform rises, the cantilever and rotating seat are locked simultaneously; when it descends, the U-shaped frame and rotating seat are locked simultaneously. This allows switching between single-sided extrusion deflection of the die core on the die wheel, synchronous deflection in conjunction with the die wheel's rotation, and intermittent differential deflection between the die core and the die wheel. Furthermore, by changing the power transmission path through time-sharing locking, the system enables free switching between extrusion bending, drawing bending, and combined bending modes of the tube.

[0007] As a further description of the above technical solution: the control structure also includes several electromagnets installed below the cantilever, the upper and lower sides of the spline table are toothed, and the opposite sides of the cantilever and the U-shaped frame are provided with positioning grooves that mate with the toothed spline table, and the drive shaft axially passes through the rotating seat.

[0008] As a further description of the above technical solution: the moving mold structure also includes an electric telescopic rod installed on the U-shaped frame, and the telescopic end of the electric telescopic rod is fixed to the pressure bearing pair.

[0009] As a further description of the above technical solution: the pressure bearing pair includes a slide that slides inside the U-shaped frame, a pressure wheel is rotatably mounted on the slide, and two gears are fixed on the arc-shaped sidewall of the pressure wheel. Two sets of limiting wheels are respectively installed on the upper and lower sides of the slide, and a sliding groove is provided on the slide to engage and slide with the U-shaped frame.

[0010] As a further description of the above technical solution: the mold core includes a mold body with one side concave. The outer edge of the concave side of the mold body is arc-shaped to fit the two sides of the mold wheel to form a positioning. The outer edge of the concave side of the mold body is provided with a second tooth. The right side of the mold body is provided with two tooth grooves that mesh synchronously with the gear. A pressure application platform is formed between the two tooth grooves to cooperate with the pressure roller to transmit pressure. The upper and lower sides of the mold body are provided with a limiting platform for fitting the rolling of the limiting wheel to form a horizontal limiting sliding state.

[0011] As a further description of the above technical solution: the mold wheel includes a wheel body, and the top of the wheel body is recessed in a stepped shape and has a locking groove for mounting the bearing. The bottom of the wheel body is integrally formed with a locking platform for inserting into the rotating seat for frictional contact. The outer edge of the wheel body is provided with a first tooth that meshes with the second tooth.

[0012] As a further description of the above technical solution: the drive shaft includes a shaft body that passes through the rotating seat, and the shaft body is integrally formed with a rib. A bearing is pressed from above the rib and fits into the rotating seat to form a rotational support. The top of the shaft body is provided with a threaded part, and a top sleeve is installed on the threaded part by a nut. The bottom of the top sleeve is provided with a pressure table for pressing the bearing in the locking groove. The top sleeve is fixed to the top of the U-shaped frame and is rotated and installed in a state of clamping the two ends of the mold wheel by the pressing of the top nut and the rib.

[0013] As a further description of the above technical solution: a driver is fixed at the bottom of the cantilever, and the output shaft of the driver is fixed to the drive shaft. The driver consists of a stepper motor and a reducer.

[0014] This invention also discloses a CNC pipe bending machine for air conditioning pipe processing, including the CNC pipe bending assembly for air conditioning pipe processing as described above, and further including a frame and a feeding mechanism mounted on the frame. The feeding mechanism includes a rotating clamp and an electric telescopic rod for axially conveying the air conditioning pipe after it is clamped by the rotating clamp, so as to cooperate with the directional or fixed-distance bending of the CNC pipe bending assembly. The feeding mechanism is composed of a rotating clamp with an electric telescopic rod, which is used for axially conveying the air conditioning pipe after it is clamped and for controlling the deflection angle of the air conditioning pipe, so as to cooperate with the CNC pipe bending assembly for directional or fixed-distance bending of the air conditioning pipe.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: This invention utilizes a control structure comprised of a spline table, an electromagnet, and a rotating base. This structure allows for selective locking between the die wheel and the cantilever / U-shaped frame according to processing requirements, thereby altering the relative motion between the die wheel and the die core. This enables the same pipe bending assembly to perform pull-out bending, extrusion bending, and intermittent composite bending under different control states. Compared to traditional pipe bending equipment where the die movement is fixed and bending is achieved solely through single rotation or unidirectional extrusion, this solution actively adjusts the motion between the die wheel and the die core. This makes the stress process on the pipe more flexible, allowing for the selection of appropriate bending modes for pipes of different materials, wall thicknesses, and bending radii, thus improving the equipment's adaptability to complex pipe processing needs. When the spline table is locked to the U-shaped frame, the mold core can rotate synchronously around the mold wheel along with the U-shaped frame, so that the tube body forms an end clamping and pulling bend under the support of the mold wheel. By using the mold wheel as a forming reference to guide the tube body, the deviation phenomenon of the tube body during the bending process can be reduced and the consistency of the bending trajectory can be improved. When the spline table and cantilever are locked, the die wheel remains fixed, while the die core moves along the outside of the die wheel under the drive shaft. Continuous bending is achieved through the meshing and extrusion of the die core and the die wheel, so that the stress area of ​​the tube changes continuously as the die core moves. At this time, the die core is engaged and deflected circumferentially with the outer edge of the die wheel and is displaced. The concave inner side of the die core continuously fits the tube and continuously provides support for the section to be bent, avoiding the problem of local over-extrusion caused by traditional fixed pressure point processing and improving the smoothness of the bent surface.

[0016] By controlling the intermittent switching of the electromagnet, the spline table can quickly switch between different locking positions, creating a periodic relative motion difference between the die wheel and the die core, thus achieving a combined extrusion bending and drawing bending process. This structure allows the tube to be subjected to both radial forming pressure and axial traction during bending, resulting in a more uniform distribution of internal stress in the material. This reduces problems such as tube wall thinning, wrinkling, and localized deformation caused by a single bending method, thereby improving the processing quality of thin-walled tubes. Attached Figure Description

[0017] Figure 1 A three-dimensional schematic diagram of the present invention is shown; Figure 2 A schematic diagram of the invention from the left view is shown; Figure 3 A frontal cross-sectional view of the present invention is shown; Figure 4 A cross-sectional schematic diagram of the mold wheel of the present invention is shown; Figure 5 A partial cross-sectional schematic diagram of the control structure of the present invention is shown; Figure 6 A three-dimensional schematic diagram of the pressure-bearing pair of the present invention is shown; Figure 7 A three-dimensional schematic diagram of the mold core of the present invention is shown; Figure 8 An exploded view of the axially related structure of the drive shaft of the present invention is shown; Figure 9 A schematic diagram illustrating the principle of Embodiment 1 of the present invention is shown; Figure 10 The diagram illustrates the principle of Embodiment 2 of the present invention.

[0018] Legend: 1. Cantilever; 2. Fixed mold structure; 21. Mold wheel; 211. Wheel body; 212. Lock groove; 213. Locking platform; 214. First tooth; 22. Control structure; 221. Rotary seat; 222. Splined platform; 223. Electromagnet; 3. Moving mold structure; 31. U-shaped frame; 32. Electric telescopic rod; 33. Pressure bearing pair; 331. Slide; 332. Pressure roller; 333. Gear; 334. Slide groove; 335. Limiting wheel; 4. Mold core; 41. Mold body; 42. Pressure platform; 43. Tooth groove; 44. Limiting platform; 45. Second tooth; 5. Driver; 6. Drive shaft; 61. Shaft body; 62. Protruding rib; 63. Threaded part; 64. Top sleeve; 65. Pressure platform. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] like Figures 1-10 As shown, the present invention provides a CNC pipe bending assembly for air conditioning pipe processing, including a cantilever 1 and a fixed mold structure 2 installed thereon, and a moving mold structure 3 extruded on one side of the fixed mold structure 2. The fixed mold structure 2 includes a mold wheel 21 and a control structure 22 installed at the bottom end of the mold wheel 21.

[0021] The solution uses the driver 5 to drive the drive shaft 6 to rotate, so that the drive shaft 6 can selectively drive the mold wheel 21 or the moving mold structure 3 to move according to the locking state of the control structure 22, so that the mold wheel 21 and the mold core 4 can form different forms of relative motion relationship, thereby realizing the drawing, extrusion bending and compound bending processing of the air conditioning pipe body.

[0022] Specifically, such as Figure 3 As shown, the moving mold structure 3 includes a U-shaped frame 31 mounted on the drive shaft 6, and a pressure bearing pair 33 is slidably mounted on the U-shaped frame 31. The U-shaped frame 31 is open in shape, which provides installation space and motion guidance for the pressure bearing pair 33. The pressure bearing pair 33 can move horizontally along the U-shaped frame 31 to adjust the relative contact position between the mold core 4 and the mold wheel 21.

[0023] An electric telescopic rod 32 is installed on the U-shaped frame 31, and the telescopic end of the electric telescopic rod 32 pushes and pulls the pressure bearing pair 33 horizontally.

[0024] By extending and retracting the electric telescopic rod 32, the pressure bearing pair 33 can be moved along the U-shaped frame 31, causing the mold core 4 mounted on the pressure bearing pair 33 to move closer to or further away from the mold wheel 21. This adjusts the meshing state between the mold core 4 and the mold wheel 21. During this process, the tips of the gear 333 and the tooth groove 43 are both pointed. When the electric telescopic rod 32 pushes the pressure bearing pair 33 closer to the mold core 4, if the tips of the gear 333 and the tooth groove 43 come into relative contact, the motor driving the gear 333 is in a non-locked state. Through the inclined guiding effect of the pointed tooth tip, the gear 333 is forced to rotate slightly, so that the gear 333 can smoothly slide into the tooth groove 43 to complete precise meshing. The mold core 4 can slide and align on the pressure bearing pair 33 to maintain stable meshing between the mold core 4 and the mold wheel 21, avoiding problems such as tooth tip interference or hard contact tooth breakage.

[0025] When processing air conditioning pipes of different lengths or with different bending positions, the working area of ​​the mold core 4 can be changed by adjusting the position of the pressure bearing pair 33, thereby improving the equipment's adaptability to different processing dimensions.

[0026] Specifically, such as Figure 6 As shown, the pressure bearing pair 33 includes a slide 331 that slides inside the U-shaped frame 31. The slide 331 serves as the main bearing body of the mold core 4 and is used to bear the radial pressure generated during bending and the power transmission during movement. A pressure roller 332 is rotatably mounted on the slide 331, and two gears 333 are fixed on the arc-shaped sidewall of the pressure roller 332. The pressure roller 332 is located on one side of the mold core 4. During the movement of the mold core 4 under pressure, the pressure roller 332 can abut against the pressure area on the surface of the mold core 4 and transmit the driving force to the mold core 4 through its own rotation, so that the mold core 4 can maintain stable movement under pressure. Meanwhile, the two gears 333 on the pressure roller 332 can mesh with the toothed grooves 43 on the mold core 4, so that when the pressure roller 332 rotates, it drives the mold core 4 to generate synchronous displacement, improving the continuity of the mold core 4's movement. Two sets of limiting wheels 335 are installed on the upper and lower sides of the slide 331, and the slide 331 has a sliding groove 334 that engages and slides with the U-shaped frame 31. Through the cooperation of the sliding groove 334 and the U-shaped frame 31, the slide 331 can move in a predetermined direction, preventing the pressure pair 33 from deviating during its movement. At the same time, the two sets of limiting wheels 335 respectively constrain the upper and lower sides of the mold core 4, keeping the mold core 4 in a horizontal state during bending, improving the meshing accuracy between the mold core 4 and the mold roller 21.

[0027] Specifically, such as Figure 3 and Figure 7As shown, a mold core 4, which engages with a mold wheel 21, is horizontally limited and slidable on the slide 331 by a pressure roller 332 and two sets of limiting rollers 335. The mold core 4 includes a mold body 41 with one side concave. The outer edge of the concave side of the mold body 41 is arc-shaped to fit against both sides of the mold wheel 21 for positioning. During the movement and deflection of the mold core 4, a stable engagement relationship is maintained with the mold wheel 21. The outer edge of the concave side of the mold body 41 is provided with a second tooth 45, which engages with the first tooth 214 on the outer edge of the mold wheel 21, enabling synchronous transmission between the mold core 4 and the mold wheel 21. Through the tooth engagement structure, the rotational motion of the mold wheel 21 can be converted into the deflection and displacement motion of the mold core 4, allowing the mold core 4 to move continuously along the outer circumference of the mold wheel 21.

[0028] Two toothed grooves 43 are formed on the right side of the mold body 41, which mesh synchronously with the gear 333. A pressure table 42 is formed between the two toothed grooves 43 to transmit pressure in conjunction with the pressure roller 332. During the processing, the pressure roller 332 meshes with the toothed grooves 43 through the gear 333, and at the same time, the outer surface of the pressure roller 332 abuts against the pressure table 42, so that the pressure roller 332 can simultaneously provide motion driving force and extrusion force to the mold core 4. When the outer surface of the pressure roller 332 just abuts against the pressure table 42, the electric telescopic rod 32 stops its stroke and maintains rigid support at that position. At this time, gear 333 and tooth groove 43 reach the preset standard meshing depth, so that the mold core 4 continuously applies bending pressure to the tube body during the movement. The upper and lower sides of the mold body 41 are provided with limiting platforms 44 for rolling with the limiting wheel 335 to form a horizontal limiting sliding state. The limiting platforms 44 are provided on the upper and lower sides of the mold body 41. The limiting platforms 44 are used to roll contact with the limiting wheel 335, so that the mold core 4 can still maintain stable horizontal movement when subjected to pressure, avoid the mold core 4 tilting due to unilateral force, and improve the stability during the bending process.

[0029] Specifically, such as Figure 4 As shown, the die wheel 21 includes a wheel body 211, which serves as the main forming reference during the tube bending process. Its top is recessed in a stepped shape and has a locking groove 212 for mounting bearings, allowing the die wheel 21 to rotate stably under the support of the drive shaft 6. The bottom of the wheel body 211 has a protruding, integrally formed locking platform 213 for frictional engagement with the rotating seat 221, ensuring a stable fit between the die wheel 21 and the rotating seat 221 after installation. The locking platform 213, inserted into the rotating seat 221, maintains synchronous movement between the die wheel 21 and the rotating seat 221 under upward and downward pressure. However, due to the characteristics of friction, while normal transmission is fine when pressure increases, when abnormal external forces occur, such as the tube not moving but the drive shaft 6 still being driven, sliding friction will occur between the die wheel 21 and the rotating seat 221, serving as a safety feature.

[0030] The outer edge of the wheel body 211 is provided with a first tooth 214 that meshes with the second tooth 45. The first tooth 214 is used to mesh with the second tooth 45 on the mold core 4, so that the mold wheel 21 and the mold core 4 form a synchronous transmission relationship.

[0031] Specifically, see the attached document. Figure 4 , Figure 5 and Figure 8 As shown, a drive shaft 6 rotatably extends through the mold wheel 21. The drive shaft 6 includes a shaft body 61 that extends through the rotating seat 221. A rib 62 is integrally formed on the shaft body 61, and a bearing is pressed from above the rib 62, forming a rotational support within the rotating seat 221. When the shaft body 61 is rotatably installed, the bearing is pressed from above the rib 62, forming a rotational support between the bearing and the inner wall of the rotating seat 221, thereby improving the stability of the drive shaft 6 during rotation. A threaded portion 63 is provided at the top of the shaft body 61, and a top sleeve 64 is installed on the threaded portion 63 by a nut. A pressure plate 65 is provided at the bottom of the top sleeve 64, which extends into the locking groove 212 at the top of the mold wheel 21 and applies axial pressure to the bearing within the locking groove 212. The top sleeve 64 has a pressure table 65 at its bottom for pressing the bearing inside the locking groove 212. The top sleeve 64 is fixed to the top of the U-shaped frame 31 and, under the pressure of the top nut, forms a rotating installation with the protruding rib 62 clamping both ends of the mold wheel 21. After the nut is tightened, the top sleeve 64 is subjected to axial pressure, causing the pressure table 65 to press the bearing downward. At the same time, the protruding rib 62 at the bottom of the shaft 61 provides support to the other side, thus forming a clamping rotating installation structure for the mold wheel 21 in the axial direction. This structure ensures that the mold wheel 21 can rotate stably around the drive shaft 6, facilitates the quick replacement of mold wheels 21 of different specifications by removing the nut, and maintains the synchronicity of rotation between the mold wheel 21 and the rotating seat 221 under increased pressure. When sliding friction occurs between the mold wheel 21 and the rotating seat 221, this method eliminates the hard bending force and reduces the stress load on the tube body.

[0032] The top sleeve 64 is fixed to the top of the U-shaped frame 31. The bottom of the top sleeve 64 is provided with a pressure table 65 for pressing the bearing in the locking groove 212. The top nut presses against the top sleeve 64 and forms a rotating installation in which the mold wheel 21 is clamped at both ends by the rib 62. In this way, the pressure at the top is maintained by the bearing at the top to keep the top sleeve 64 pressing against the pressure table 65. At the same time, the top sleeve 64 is engaged with the slot on the threaded part 63 to keep the drive shaft 6 from interfering with the state of the mold wheel 21 during the transmission of the U-shaped frame 31.

[0033] like Figure 1As shown, a driver 5 is fixed at the bottom of the cantilever 1, and the output shaft of the driver 5 is fixed to the drive shaft 6. The driver 5 consists of a stepper motor and a reducer. The stepper motor provides precise angle control, and the reducer reduces the output speed and increases the output torque, so that the drive shaft 6 can stably drive the mold wheel 21 and the moving mold structure 3 to complete the bending action.

[0034] Reference Appendix Figure 4 and Figure 5 As shown, the control structure 22 includes a rotating seat 221 that rubs against the bottom end of the mold wheel 21, and a spline table 222 that is vertically raised and lowered by electromagnetic force is splined on the rotating seat 221. Several electromagnets 223 are installed below the cantilever 1. When the electromagnets 223 are energized, they generate an attraction force, causing the spline table 222 to move upward against its own gravity. The spline table 222 moves up and down along the axial direction of the rotating seat 221 to achieve position switching. The upper and lower sides of the spline table 222 are toothed, and the opposite sides of the cantilever 1 and the U-shaped frame 31 are provided with positioning grooves that mate with the toothed spline table 222. The drive shaft 6 passes through the rotating seat 221 axially.

[0035] When the electromagnet 223 is not working, the spline table 222 descends under the action of gravity and engages with the positioning groove on the U-shaped frame 31. At this time, the rotating seat 221 and the U-shaped frame 31 form a locking relationship, so that when the drive shaft 6 rotates, it can drive the U-shaped frame 31 to move, so that the mold core 4 can rotate synchronously around the mold wheel 21.

[0036] When the electromagnet 223 is energized, the spline table 222 moves upward and disengages from the U-shaped frame 31, while engaging with the positioning groove on the cantilever 1. At this time, the rotating seat 221 and the cantilever 1 form a locking relationship, keeping the mold wheel 21 fixed, while the U-shaped frame 31 continues to move, causing the mold core 4 to move along the outside of the mold wheel 21 and complete the extrusion bending.

[0037] When the spline table 222 rises under electromagnetic force and engages with the cantilever 1, the spline table 222 and the rotary seat 221 are locked synchronously, and the spline table 222 descends and locks synchronously with the U-shaped frame 31 and the rotary seat 221. This is used to switch between the single-sided extrusion deflection of the mold core 4 on the mold wheel 21, the synchronous deflection of the mold wheel 21 rotating, and the intermittent differential deflection between the mold core 4 and the mold wheel 21.

[0038] When this solution is used, there are the following implementation methods: Example 1, see attached document Figure 9As shown, unlike the above situation, when the electromagnet 223 is activated, the spline table 222 is attracted and moved upward and disengages from the U-shaped frame 31 and engages with the cantilever 1. At this time, the mold wheel 21 is locked and cannot rotate, but the drive shaft 6 continues to squeeze the mold core 4 against one side of the mold wheel 21 along with the U-shaped frame 31 and the pressure pair 33. Since the mold wheel 21 cannot rotate, the revolving mold core 4 deflects under the action of meshing with the mold wheel 21, while maintaining the non-slip tube side under pressure bending. Moreover, the extrusion surface of the mold core 4 has no repeated contact surface with the tube, maintaining linear continuous extrusion bending.

[0039] Example 2, see attached document Figure 10 As shown, in this scheme, the drive shaft 6 is rotated by the drive 5, and the drive shaft 6 deflects the U-shaped frame 31 fixed on it. At this time, the spline table 222 of the control structure 22 falls down under the action of gravity and meshes with the U-shaped frame 31, so that the U-shaped frame 31 clamps the mold core 4 through the pressure roller 332 and the limiting roller 335 and deflects at the same time. Based on the meshing of the U-shaped frame 31 and the spline table 222, the rotating seat 221 of the mold wheel 21 and the U-shaped frame 31 form a transmission and rotate synchronously. Under the action of the U-shaped frame 31, the mold core 4 is attached to the mold wheel 21 and revolves with the rotation of the mold wheel 21. Under the end clamping action between the long plate-shaped mold core 4 and the mold wheel 21, the tube is directionally bent based on the mold wheel 21. This method uses the tube end clamping and deflection method to perform drawing and bending.

[0040] Example 3, see attached document Figure 9 and attached Figure 10 This solution is based on the two embodiments mentioned above. The difference is that during the bending process, the electromagnet 223 is in a regular intermittent energized state, so that when the mold core 4 revolves around the mold wheel 21, the mold core 4 deflects itself, and after the mold core 4 is bent for a period of time, the mold wheel 21 rotates for a period of time to perform a pulling and bending combination.

[0041] In Example 4, this solution can also adjust the extension of the mold core 4 relative to the U-shaped frame 31 by switching the locking state of the control structure 22, so as to adapt to the processing requirements of different bending positions of the tube.

[0042] Specifically, when it is necessary to adjust the extension of the mold core 4, the electromagnet 223 is first energized, causing the spline table 222 to move upward and engage with the positioning groove on the cantilever 1. At this time, the rotating seat 221 remains locked with the cantilever 1, the mold wheel 21 remains fixed, and the U-shaped frame 31 is deflected under the drive of the drive shaft 6, causing the mold core 4 to move along the outer circumference of the mold wheel 21. At this time, the movement of the mold core 4 to the preset reset position is used as the adjustment reference. The preset reset position is determined according to the bending position of the tube to be processed, so that the working end of the mold core 4 can correspond to the predetermined bending area of ​​the tube.

[0043] When the mold core 4 reaches the preset reset position, the electromagnet 223 is de-energized, and the spline table 222 moves downward under gravity and re-engages with the positioning groove on the U-shaped frame 31, causing the rotating seat 221 to switch from being locked to the cantilever 1 to being locked to the U-shaped frame 31. At this time, the U-shaped frame 31 continues to be driven by the drive shaft 6, and through the spline table 222 and the rotating seat 221, it drives the mold wheel 21 to rotate synchronously, causing the mold wheel 21 to rotate relative to the mold core 4, which is already in the preset reset position.

[0044] Since the first tooth 214 on the outer edge of the mold wheel 21 is engaged with the second tooth 45 on the mold core 4, the relative meshing position of the mold wheel 21 can be changed through the meshing relationship between the first tooth 214 and the second tooth 45 during the rotation of the mold wheel 21. At the same time, the mold core 4 is horizontally constrained by the pressure wheel 332 and the limiting wheel 335, and can slide along its length direction on the slide 331. Therefore, the meshing displacement generated by the rotation of the mold wheel 21 can drive the mold core 4 to produce a horizontal displacement relative to the slide 331, so that the length of the mold core 4 extending from the U-shaped frame 31 changes.

[0045] In the actual adjustment process, the required extension length of the mold core 4 is predetermined according to the target bending position. By controlling the rotation angle of the driver 5, the mold wheel 21 rotates relative to the mold core 4 to the corresponding engagement position. When the mold core 4 reaches the target extension length, the driver 5 stops rotating and maintains the engagement state between the spline table 222 and the U-shaped frame 31, keeping the mold wheel 21 and the U-shaped frame 31 synchronously locked, thereby holding the mold core 4 in the corresponding working position. Thus, by changing the relative engagement position between the mold wheel 21 and the mold core 4, the extension amount of the mold core 4 can be changed, allowing the working area of ​​the mold core 4 to be adjusted according to the bending position of the tube.

[0046] The preset reset position is used to establish a unified benchmark for each extension adjustment, ensuring that the mold core 4 starts from the same initial position each time its extension is adjusted. The target extension is determined based on the distance between the bending position of the tube body and the benchmark position of the mold core 4. By controlling the angle of the driver 5 and the meshing relationship between the mold wheel 21 and the mold core 4, the rotation angle of the driver 5 is converted into the horizontal displacement of the mold core 4, thereby achieving controllable adjustment of the extension of the mold core 4.

[0047] Based on the above four embodiments, when this solution is used, the electric telescopic rod 32 can slide the slide 331 on the inner wall of the U-shaped frame 31, so that the mold core 4 held by the limiting wheel 335 and the pressure wheel 332 on the slide 331 can be moved synchronously, which can clamp and release the tube body during loading and unloading.

[0048] Furthermore, based on the above four embodiments, this solution facilitates the quick assembly and disassembly of the required mold wheel 21 and mold core 4 according to the processing needs of different pipe diameters. First, the electric telescopic rod 32 is kept retracted so that the mold core 4 is disengaged from the mold wheel 21, and then it can be directly pulled out and replaced with a new specification mold core 4. For the mold wheel 21, the nut on the top of the drive shaft 6 needs to be removed, and then the top sleeve 64 and the pressure table 65 are removed in sequence to remove the mold wheel 21. When installing the new specification mold wheel 21, the locking table 213 at the bottom is inserted into the rotating seat 221, and the top sleeve 64, pressure table 65 and nut are reset.

[0049] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A CNC pipe bending assembly for air conditioning pipe processing, comprising a cantilever (1) and a fixed mold structure (2) mounted thereon, and a moving mold structure (3) extruded from one side of the fixed mold structure (2), characterized in that: The fixed mold structure (2) includes a mold wheel (21) and a control structure (22) installed at the bottom of the mold wheel (21). A drive shaft (6) is axially rotatable through the mold wheel (21). The moving mold structure (3) includes a U-shaped frame (31) mounted on the drive shaft (6), and a pressure bearing pair (33) is slidably mounted on the U-shaped frame (31). A mold core (4) that meshes with the mold wheel (21) is horizontally limited and slidably mounted on the pressure bearing pair (33). The control structure (22) includes a rotating seat (221) that rubs against the bottom of the mold wheel (21), and a spline table (222) that is vertically raised and lowered by electromagnetic force is splined on the rotating seat (221). When the spline table (222) rises, the cantilever (1) and the rotating seat (221) are locked simultaneously. When it falls, the U-shaped frame (31) and the rotating seat (221) are locked simultaneously. The power transmission path is changed by time-sharing locking, so as to realize the free switching of tube extrusion bending, drawing bending and compound bending modes.

2. The CNC pipe bending assembly for air conditioning pipe processing according to claim 1, characterized in that, The control structure (22) also includes several electromagnets (223) installed below the cantilever (1). The upper and lower sides of the spline table (222) are toothed, and the opposite sides of the cantilever (1) and the U-shaped frame (31) are provided with positioning grooves that cooperate with the toothed spline table (222). The drive shaft (6) passes through the rotating seat (221) axially.

3. The CNC pipe bending assembly for air conditioning pipe processing according to claim 1, characterized in that, The moving mold structure (3) also includes an electric telescopic rod (32) installed on the U-shaped frame (31), and the telescopic end of the electric telescopic rod (32) is fixed to the pressure bearing pair (33).

4. The CNC pipe bending assembly for air conditioning pipe processing according to claim 1, characterized in that, The pressure bearing pair (33) includes a slide (331) that slides inside the U-shaped frame (31). A pressure wheel (332) is rotatably mounted on the slide (331), and two gears (333) are fixed on the arc-shaped sidewall of the pressure wheel (332). Two sets of limiting wheels (335) are respectively installed on the upper and lower sides of the slide (331). A slide groove (334) is provided on the slide (331) that is fitted and slidable with the U-shaped frame (31).

5. The CNC pipe bending assembly for air conditioning pipe processing according to claim 4, characterized in that, The mold core (4) includes a mold body (41) with one side concave. The outer edge of the concave side of the mold body (41) is arc-shaped to fit the two sides of the mold wheel (21) for positioning. The outer edge of the concave side of the mold body (41) is provided with a second tooth (45). The right side of the mold body (41) is provided with two tooth grooves (43) that mesh synchronously with the gear (333). A pressure plate (42) is formed between the two tooth grooves (43) to cooperate with the pressure wheel (332) to transmit pressure. The upper and lower sides of the mold body (41) are provided with a limiting plate (44) for fitting the limiting wheel (335) to roll to form a horizontal limiting sliding state.

6. The CNC pipe bending assembly for air conditioning pipe processing according to claim 5, characterized in that, The mold wheel (21) includes a wheel body (211), and the top of the wheel body (211) is recessed in a stepped shape and has a locking groove (212) for mounting the bearing. The bottom of the wheel body (211) is integrally formed with a locking platform (213) for inserting into the rotating seat (221) for frictional contact. The outer edge of the wheel body (211) is provided with a first tooth (214) that meshes with the second tooth (45).

7. The CNC pipe bending assembly for air conditioning pipe processing according to claim 6, characterized in that, The drive shaft (6) includes a shaft body (61) that passes through the rotating seat (221), and a rib (62) is integrally formed on the shaft body (61). A bearing is pressed from above the rib (62) and fits into the rotating seat (221) to form a rotational support. A threaded part (63) is provided on the top of the shaft body (61). A top sleeve (64) is installed on the threaded part (63) by a nut. A pressure table (65) for pressing the bearing in the locking groove (212) is provided at the bottom of the top sleeve (64). The top sleeve (64) is fixed to the top of the U-shaped frame (31) and rotated by the top nut to form a clamping state between the two ends of the mold wheel (21).

8. The CNC pipe bending assembly for air conditioning pipe processing according to claim 1, characterized in that, The bottom of the cantilever (1) is fixed with a driver (5), and the output shaft of the driver (5) is fixed with the drive shaft (6).

9. A CNC pipe bending machine for processing air conditioning pipes, characterized in that, The system includes the CNC pipe bending assembly for air conditioning pipe processing as described in claim 7; it also includes a frame and a feeding mechanism mounted on the frame, the feeding mechanism including a rotary clamp and an electric telescopic rod for axially conveying the air conditioning pipe after it is clamped by the rotary clamp, so as to cooperate with the directional or fixed-distance bending of the CNC pipe bending assembly.

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