Multi-head spiral coil machine without internal stress

Abstract

The invention relates to the technical field of spiral coil machines, and in particular to a multi-head spiral coil machine without internal stress. The existing coil technology accuracy and internal stress problems cannot be solved at the same time. The multi-head spiral coil machine without internal stress comprises a machine body and a base located below the machine body, a feeding device is arranged on the side of the machine body, and fixed frames are arranged at both ends of the base. The machine body comprises a main shaft, a plurality of rolling shafts, a rolling shaft support seat and internal and external meshing gears, both ends of the main shaft are fixed on the fixed frame, and each rolling shaft is rotatably connected with the rolling shaft support seat. The rolling shafts are evenly arranged in the circumferential direction of the outer periphery of the main shaft through the rolling shaft support seat. An openable and closable locking device for pressing the tube embryo on the surface of the machine body is arranged outside the machine body, a guide rail is arranged on the base, and a hydraulic cylinder is arranged in the guide rail for the openable and closable locking device to move on the base. The internal stress is eliminated and the dimensional accuracy of the spiral coil is ensured through the locking device and the rotating rolling shaft. The invention has a good development prospect in the technical field of spiral coil machines.

Description

Technical Field

[0001] The invention relates to the technical field of spiral coiling machines, in particular to a multi-head spiral coiling machine without internal stress. Background Art

[0002] At present, there are two ways to make multi-head spiral tube coiling machines: one is to use the principle of a three-roller or four-roller profile bending machine, through a multi-slot mold, to roll and form; the other method is to use an expandable and shrinkable roller of a certain diameter, fix multiple tube blanks on the roller, and rotate the roller through power transmission, so that the tube blanks are wound on the roller.

[0003] The former implementation method has two limitations: 1. The number of coils at one time is limited; 2. Due to the rebound of the bending radius of each head tube blank, it is difficult to ensure the consistency of the bending radius of each tube blank, resulting in the inability to ensure the dimensional accuracy of the spiral coil product. The latter implementation method is easier to ensure the dimensional accuracy of the spiral coil product, but there is a large internal stress in the coil that cannot be eradicated, which affects the next coating process of the spiral coil (the coating is easy to fall off), which is a fatal defect especially for manufacturers who need to coat the inner wall with ceramic materials.

[0004] Therefore, a coiler device is needed that can meet the construction requirements in terms of accuracy and eliminate internal stress as much as possible. Summary of the invention

[0005] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a multi-head spiral coil machine without internal stress, which solves the problem that the accuracy and internal stress problems of the prior coil technology cannot be solved at the same time.

[0006] The technical solution is that the multi-head spiral coiling machine without internal stress comprises a body for winding pipes and a base located below the body for supporting and fixing, the base is in contact with the ground, and a feeding device for the pipe embryos to enter the body for winding is arranged on the side of the body. During the whole process of coiling, the feeding device advances at a synchronous speed to ensure that the pipe embryos are evenly and smoothly transferred into the body for the next coiling work. Fixed frames are arranged at both ends of the base, and each of the fixed frames is perpendicular to and fixed to the base. The fixing method can be fixed by bolts. The body comprises a main shaft, a plurality of rolling shafts, a front support seat of the rolling shaft and a rear support seat of the rolling shaft. The front fixed frame of the rolling shaft is provided with an internal and external meshing gear for fixing the pipe embryos on a side close to the fixed frame. The two ends of the main shaft are fixed on the fixed frame. The main shaft only serves as a support and does not rotate itself. One end of each rolling shaft is rotatably connected to the front support seat of the rolling shaft, and the other end of each rolling shaft is rotatably connected to the rear support seat of the rolling shaft. The rolling shafts are evenly arranged on the main shaft through the rolling shaft support seats In the outer circumferential direction, after each of the rolling shafts passes through the front fixing frame of the rolling shaft, it is stuck on the inner and outer meshing gears, and is affected by the rotation of the inner and outer meshing gears to produce self-rotation. The front fixing frame of the rolling shaft and the rear fixing frame of the rolling shaft rotate on the auxiliary rolling shaft, and do not rotate themselves or provide force. While the inner and outer meshing gears rotate, they drive the tube embryo fixed thereon to be wound on the rotating rolling shaft. There is rolling friction between the tube embryo and each of the rolling shafts, so that the residual stress generated by the tube embryo during the winding process can be well eliminated. An openable and closable locking device for pressing the surface of the body to wrap the tube embryo is provided outside the body. When the tube embryo is fixed on the inner and outer meshing gears, the locking device is in an open state. After the installation is completed, the locking device is in a closed state, pressing the tube embryo against the outer cylindrical surface formed by multiple rolling shafts. During the winding process, the tube embryo is tracked and corrected to ensure its dimensional accuracy. A guide rail is provided on the base, and a hydraulic cylinder is provided under the guide rail for the openable and closable locking device to move on the base to achieve opening and closing.

[0007] Furthermore, each of the locking devices includes a plurality of correction rollers, a correction roller support frame and two support seats that open and close by moving, each of the support seats is provided with a semicircular groove and the two semicircular grooves form a cylindrical channel outside the body when the two support seats are locked, each of the correction rollers is mounted on the correction roller support frame and is evenly arranged on the support seat in a circumferential direction, an annular space that can compress the tube embryo is formed between the cylindrical channel and the rolling shaft, and the annular space is consistent with the diameter of the tube embryo to achieve the compression of multiple tube embryos by the locking device.

[0008] Furthermore, a plurality of tube end clamps for clamping the rolling wheel are arranged on one side of the inner and outer meshing gears close to the front support seat of the rolling shaft, and each of the tube end clamps is evenly distributed on the edge of the inner and outer meshing gears in the circumferential direction. The number of tube end clamps is recorded as n. Each time a tube embryo is installed, the inner and outer meshing gears are rotated by a fixed angle θ, wherein θ=360 / n. After all tube embryos are clamped, the hydraulic cylinder is turned on to push the two open support seats toward the middle and lock them. The inner and outer meshing gears drive the tube end clamps and the rolling shaft to rotate by themselves, so that the tube embryo is wound around the rolling shaft. The correction roller and the tube embryo are in a rolling friction state, so that the residual stress generated by the tube embryo during the winding process can be well eliminated, and the locking device limits the free rebound error of the tube embryo, so that the accuracy of the coil is guaranteed.

[0009] Furthermore, the inner and outer meshing gears are provided with a slot hole for the main shaft to pass through and a plurality of grooves for the rolling shaft to be inserted, the front support seat of the rolling shaft is provided with a plurality of slot holes corresponding to the grooves, the rear support seat of the rolling shaft is provided with a slot hole for the rotation of each rolling shaft, and a gear is provided at one end of each rolling shaft that passes through the slot hole on the front support seat of the rolling shaft and falls into the groove. The inner and outer meshing gears drive the outer teeth of the inner and outer meshing gears through external power transmission force, thereby driving the inner and outer meshing gears to rotate. An inner gear ring is made on the inner and outer meshing gears. As the inner and outer meshing gears rotate, the gears at the end of each rolling shaft are driven to rotate, thereby causing the rolling shaft to rotate.

[0010] Furthermore, a bearing is provided in the slot hole of the inner and outer meshing gears, and the inner wall of the bearing is interference-connected with the outer diameter of the main shaft, so that the inner and outer meshing gears rotate while the main shaft remains stationary.

[0011] Furthermore, support rollers are installed between the main shaft and the rolling shaft to increase the strength of the machine body, and the number of the rolling shafts is an integer multiple of the number of support rollers.

[0012] The technical effect of the present invention is that the tube embryo is restricted between the locking device and the rolling shaft. The correction roller on the locking device that contacts the tube embryo and the rolling shaft and the tube embryo both have rolling friction with each other, thereby eliminating the residual stress generated by the tube embryo during the winding process. The locking device presses the tube embryo to a certain extent. Under the correction action of the correction roller, the tube embryo moves into the machine body under the premise of maintaining the synchronous speed with the feeding device, thereby ensuring the consistency of the bending radius of each tube embryo, thereby ensuring the dimensional accuracy of the spiral coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a front structural schematic diagram of the present invention.

[0014] Figure 2 It is a schematic diagram of the side structure of the locking device of the present invention in the closed state.

[0015] Figure 3 It is a structural schematic diagram of the locking device of the present invention in the open state.

[0016] Figure 4 It is a schematic diagram of the side structure of the internal and external meshing gears of the present invention.

[0017] Figure 5 It is a schematic diagram of the front structure of the internal and external meshing gears of the present invention.

[0018] 1. Machine body, 2. Main shaft, 3. Internal and external meshing gears, 4. Tube end clamp, 5. Front support seat of rolling shaft, 6. Rolling shaft, 7. Inner support roller, 8. Rear support seat of rolling shaft, 9. Correction roller, 10. Correction roller support frame, 11. Guide rail, 12. Tracking feeding device, 13. Tube embryo, 14. Hydraulic cylinder, 15. Support seat, 16. Fixed frame, 17. Bearing, 18. Gear, 19. Base. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0021] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] Embodiment 1: By Figures 1 to 5A multi-head spiral coiling machine without internal stress is provided, comprising a body 1 for coiling a pipe and a base located below the body 1 for supporting and fixing. The base is in contact with the ground. A feeding device 12 is provided on the side of the body 1 for feeding a pipe blank 13 into the body 1 for winding. During the whole coiling process, the feeding device 12 advances at a synchronous speed to ensure that the pipe blank 1 is evenly and smoothly transferred into the body 1 for the next coiling work. Fixing frames 16 are provided at both ends of the base. Each fixing frame 16 is perpendicular to and fixed to the base. The fixing method can be adopted The machine body 1 is fixed with bolts, and includes a main shaft 2, a plurality of rolling shafts 6, a front support seat 5 for the rolling shaft, and a rear support seat 8 for the rolling shaft. The front fixing frame 5 of the rolling shaft is provided with an inner and outer meshing gear 3 for fixing the tube blank on one side close to the fixing frame 16. The two ends of the main shaft 2 are fixed on the fixing frame 16. The main shaft 2 only serves as a support and does not rotate itself. One end of each rolling shaft 6 is rotatably connected to the front support seat 5 for the rolling shaft, and the other end of each rolling shaft 6 is rotatably connected to the rear support seat 8 for the rolling shaft. The rolling shafts 6 are evenly arranged on the rolling shaft support seats. In the circumferential direction of the outer periphery of the main shaft 2, each of the rolling shafts 6 passes through the front fixing frame 5 of the rolling shaft, is stuck on the inner and outer meshing gears 3, and is affected by the rotation of the inner and outer meshing gears 3 to produce self-rotation. The front fixing frame of the rolling shaft and the rear fixing frame of the rolling shaft rotate on the auxiliary rolling shaft, and do not rotate themselves or provide force. While the inner and outer meshing gears 3 rotate, they drive the tube blank fixed thereon to be wound on the rotating rolling shaft. There is rolling friction between the tube blank 13 and the rolling shafts 6, so that the residual friction generated by the tube blank 13 during the winding process can be well eliminated. Stress, the body 1 is provided with an openable and closable locking device for pressing the surface of the body 1 to wrap the tube embryo 13. When the tube embryo 13 is fixed on the inner and outer meshing gears 3, the locking device is in an open state. After the installation is completed, the locking device is in a closed state, and the tube embryo is pressed against the outer circular surface formed by multiple rolling shafts. During the winding process, the tube embryo is tracked and corrected to ensure its dimensional accuracy. A guide rail 11 is provided on the base 19, and a hydraulic cylinder 14 is provided under the guide rail 11 for the openable and closable locking device to move on the base to achieve opening and closing.

[0023] Embodiment 2: On the basis of embodiment 1, each of the locking devices comprises a plurality of correction rollers 9, a correction roller support frame 10 and two support seats 15 that are opened and closed by movement, each of the support seats 15 is provided with a semicircular groove and the two semicircular grooves form a cylindrical channel outside the machine body 1 when the two support seats 15 are locked, each of the correction rollers 9 is mounted on the correction roller support frame 10 and is evenly arranged on the support seat 15 in a circumferential direction, an annular space that can compress the tube embryo 13 is formed between the cylindrical channel and the rolling shaft, and the annular space is consistent with the diameter of the tube embryo to realize the compression of multiple tube embryos by the locking device, and a plurality of inner and outer meshing gears 3 are provided on one side of the support seat 5 in front of the rolling shaft for clamping the rolling wheel 6, each of the tube end clamps 4 is evenly distributed on the edge of the inner and outer meshing gears 3 in the circumferential direction, and the number of tube end clamps is recorded as n. Each time a tube embryo is installed, the inner and outer meshing gears are rotated by a fixed angle θ, where θ=360 / n. After all tube embryos are clamped, the hydraulic cylinder 14 is turned on to push the two open support seats 15 toward the middle and lock them. The inner and outer meshing gears 3 drive the tube end clamps 4 and the rolling shaft 6 to rotate by themselves, so that the tube embryo 13 is wound on the rolling shaft 6, and the correction roller 9 and the tube embryo 13 are in a rolling friction state, so that the residual stress generated by the tube embryo 13 during the winding process can be well eliminated, and the locking device limits the free rebound error of the tube embryo 13, and the accuracy of the coil is guaranteed.

[0024] Embodiment 3: On the basis of embodiment 2, a slot hole for the main shaft to pass through and a plurality of grooves for the rolling shaft 6 to be inserted are provided on the inner and outer meshing gears 3, a plurality of slot holes corresponding to the grooves are provided on the rolling shaft front support seat 5, and a slot hole for the rolling shaft 6 to rotate is provided on the rolling shaft rear support seat 8, and a gear 18 is provided at one end of each rolling shaft 6 that passes through the slot hole on the rolling shaft front support seat 5 and falls into the groove. The inner and outer meshing gears 3 drive the outer teeth of the inner and outer meshing gears 3 through external power transmission force, thereby driving the inner and outer meshing gears 3 to rotate. An inner gear ring is made on the inner and outer meshing gears 3. As the inner and outer meshing gears 3 rotate, the gears 18 at the ends of the rolling shafts 6 are driven to rotate, thereby causing the rolling shafts 6 to rotate. A bearing 17 is provided in the slot hole of the inner and outer meshing gears 3, and the inner wall of the bearing 17 is interference fit with the outer diameter of the main shaft 2, so as to achieve the purpose of rotating the inner and outer meshing gears 3 and keeping the main shaft stationary.

[0025] In the above embodiment, support rollers 7 are installed between the main shaft 2 and the rolling shaft 6 to increase the strength of the machine body 1 , and the number of the rolling shafts 6 is an integral multiple of the number of support rollers 7 .

[0026] The technical effect of the present invention is that the tube embryo is restricted between the locking device and the rolling shaft. The correction roller on the locking device that contacts the tube embryo and the rolling shaft and the tube embryo both have rolling friction with each other, thereby eliminating the residual stress generated by the tube embryo during the winding process. The locking device presses the tube embryo to a certain extent. Under the correction action of the correction roller, the tube embryo moves into the machine body under the premise of maintaining the synchronous speed with the feeding device, thereby ensuring the consistency of the bending radius of each tube embryo, thereby ensuring the dimensional accuracy of the spiral coil.

[0027] The present invention has been described in detail above through specific implementation modes and embodiments, but these do not constitute limitations of the present invention. Without departing from the principles of the present invention, those skilled in the art may also make many variations and improvements, which should also be regarded as the protection scope of the present invention.

Claims

1. A multi-head spiral coil machine without internal stress, comprising a machine body (1) and a base (19) located below the machine body (1), wherein a feeding device (12) is provided on the side of the machine body (1) for feeding tube blanks (13) into the machine body (1) for winding, characterized in that: Fixed frames (16) are arranged at both ends of the base. The machine body (1) comprises a main shaft (2), a plurality of rolling shafts (6), a front support seat (5) for the rolling shafts and a rear support seat (8) for the rolling shafts. An inner and outer meshing gear (3) for fixing the tube blank is arranged on a side of the front support seat (5) for the rolling shafts close to the fixed frame (16). Both ends of the main shaft (2) are fixed on the fixed frame (16). One end of each rolling shaft (6) is rotatably connected to the front support seat (5) for the rolling shafts, and the other end of each rolling shaft (6) is rotatably connected to the rear support seat (8) for the rolling shafts. The rolling shafts (6) are evenly arranged in the circumferential direction of the outer periphery of the main shaft (2) through the rolling shaft support seats. An openable and closable locking device for pressing the tube blank (13) on the surface of the machine body (1) is arranged on the outside of the machine body (1). A guide rail (11) is arranged on the base (19). A guide rail (11) is arranged below the guide rail (11). A hydraulic cylinder (14) is provided for the locking device that can be opened and closed to move on the guide rail (11); a slot hole for the main shaft to pass through and a plurality of grooves for the rolling shafts (6) to be inserted are provided on the internal and external meshing gears (3); a plurality of slot holes corresponding to the grooves are provided on the front support seat (5) of the rolling shaft; a slot hole for the rolling shaft (6) to rotate is provided on the rear support seat (8) of the rolling shaft; a gear (18) is provided at one end of each rolling shaft (6) that passes through the slot hole on the front support seat (5) of the rolling shaft and falls into the groove; a bearing (17) is provided in the slot hole of the internal and external meshing gears (3); the inner wall of the bearing (17) is interference-connected with the outer diameter of the main shaft (2); a support roller (7) for increasing the strength of the machine body (1) is installed between the main shaft (2) and the rolling shaft (6); the number of the rolling shafts (6) is an integer multiple of the number of the support rollers (7).

2. The multi-head spiral coil machine without internal stress according to claim 1, characterized in that: Each of the locking devices comprises a plurality of correction rollers (9), a correction roller support frame (10) and two support seats (15) that are opened and closed by movement. Each of the support seats (15) is provided with a semicircular groove, and the two semicircular grooves form a cylindrical channel outside the machine body (1) when the two support seats (15) are locked. Each of the correction rollers (9) is mounted on the correction roller support frame (10) and is evenly arranged on the support seat (15) in a circumferential direction. An annular space that can compress the tube blank (13) is formed between the cylindrical channel and the rolling shaft.

3. The multi-head spiral coil machine without internal stress according to claim 1, characterized in that: A plurality of pipe end clamps (4) for clamping the rolling shaft (6) are arranged on one side of the inner and outer meshing gears (3) close to the front support seat (5) of the rolling shaft, and each of the pipe end clamps (4) is evenly distributed on the edge of the inner and outer meshing gears (3) in the circumferential direction.

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