Spiral pipe machine

Abstract

This invention provides a spiral coiling machine for processing double-helix tubing. The two spiral segments of the double-helix tubing are connected at the same end by a curved section. The spiral coiling machine includes a frame, a mold column, and a lifting mold. A rotary support is rotatably connected to the frame. The mold column is coaxially mounted on the rotary support and is engaged with the rotary support circumferentially. A protruding positioning pin is provided at the lower end of the side wall of the mold column for inserting and positioning the curved section. The lifting mold is located on the frame and to the side of the mold column, forming two mold openings between the lifting mold and the peripheral wall of the mold column. The two mold openings are respectively suitable for the two spiral segments to pass through. When the rotary support drives the mold column to rotate, the two mold openings move upward synchronously, causing the two spiral segments to coil around the mold column. The spiral coiling machine provided by this invention can eliminate the welding process and form two spiral segments simultaneously, thereby improving the airtightness and processing efficiency of the double-helix tubing.

Description

Technical Field

[0001] This utility model belongs to the field of pipe processing technology, specifically relating to a spiral coiling machine. Background Technology

[0002] In the casting industry, double helix pipe fittings are commonly used to create cooling channels in sand molds. Considering the convenience of cooling water inflow and outflow, the double helix pipe fittings are usually structurally designed with the two helical sections connected at the same end by elbows, and the other ends of the two sections serving as the inlet and outlet, respectively.

[0003] Currently, the aforementioned double-helix pipe fittings are manufactured by first winding two single-helix pipes using a coiling machine, and then welding the two single-helix pipes together using an elbow to form a double-helix structure. The drawback of this manufacturing method is that cracks are prone to appear at the elbow weld joint, increasing the risk of leakage. Furthermore, the process requires two coiling steps and one welding step, resulting in low processing efficiency. Utility Model Content

[0004] This utility model provides a spiral coiling machine, which aims to reduce the leakage risk of double spiral pipe fittings and improve processing efficiency.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A spiral coiling machine is provided for processing double-spiral pipe fittings, wherein the two spiral segments of the double-spiral pipe fitting are connected at the same end via a curved section; the spiral coiling machine includes a frame, a mold column, and a lifting mold; a rotary support is rotatably connected to the frame; the mold column is coaxially mounted on the rotary support and is engaged with the rotary support circumferentially; a protruding positioning pin is provided at the lower end of the side wall of the mold column, the positioning pin being used to insert and position the curved section; the lifting mold is located on the frame and to the side of the mold column, forming two mold openings between the lifting mold and the peripheral wall of the mold column, the two mold openings being suitable for the two spiral segments to pass through respectively; wherein, when the rotary support drives the mold column to rotate, the two mold openings move upward synchronously, driving the two spiral segments to coil around the mold column.

[0006] In one possible implementation, the lifting mold includes:

[0007] The bracket is fixed to the machine frame and slidably connected to the mold base in the vertical direction;

[0008] Two mold wheels are rotatably connected to the mold base, spaced apart vertically. The mold wheels have grooves that match the diameter of the double-helix pipe fitting, and the grooves form a mold opening between the grooves and the peripheral wall of the mold column.

[0009] The lifting drive is located on the frame and its output end is connected to the mold base.

[0010] In some embodiments, the lifting drive includes:

[0011] The first rotating power component is fixedly connected to the frame, and its output end is connected to a drive screw. The drive screw extends vertically upward and is rotatably connected to the support.

[0012] A threaded sleeve is fitted onto the drive screw and threadedly engages with it, and the threaded sleeve is fixedly connected to the mold base.

[0013] For example, the support includes:

[0014] The column is fixedly connected to the frame and extends vertically upward;

[0015] Both optical axes are fixedly connected to the frame and are triangularly distributed with the column;

[0016] The top plate is fixedly connected to the top of the column and the two optical axes;

[0017] The mold base, column, and two optical axes are all slidably connected up and down.

[0018] For example, the mold base includes:

[0019] The sliding sleeve is fitted onto the column and is rotatably connected to two mold wheels;

[0020] Two end plates are fixedly connected to the upper and lower ends of the sliding sleeve, and both are slidably sleeved on the two optical shafts. Both end plates are provided with clearance holes suitable for the drive screw to pass through.

[0021] The middle plate is fixedly connected to the middle of the sliding sleeve and slidably connected to the two optical axes. The threaded sleeve is fixedly connected to the part of the middle plate located between the two optical axes.

[0022] The two mold wheels are located between the two end plates and on both sides of the middle plate.

[0023] In one possible implementation, the slewing bearing includes:

[0024] The rotating shaft is rotatably connected to the center of the frame;

[0025] The rotary table is fixedly connected to the upper end of the rotating shaft, used to support the mold column and form a circumferential engagement with the lower end of the mold column;

[0026] The gear ring is fixedly fitted onto the lower end of the rotating shaft;

[0027] The second rotating power component is fixedly connected to the frame and has a gear sleeved at its output end, which meshes with the gear ring.

[0028] In some embodiments, the bottom wall of the mold column is provided with a groove at its center, and the bottom of the groove is provided with a guide hole at its center; the rotary table is provided with a card plate suitable for embedding into the groove and forming a circumferential engagement with the groove, and the card plate is provided with a guide post, which is inserted into the guide hole.

[0029] For example, the lower end of the side wall of the mold column is provided with an insertion hole, the positioning pin is inserted and fixed in the insertion hole, and a pressure plate is detachably connected to the positioning pin. The pressure plate cooperates with the side wall of the mold column to clamp the curved section.

[0030] For example, the center of the locating pin has a stepped through hole, a first fastener connected to the mold column passes through the stepped through hole, and the large diameter end of the stepped through hole has a threaded section, and a second fastener connected to the threaded section passes through the pressure plate.

[0031] In some embodiments, the mold column is a hollow column, and the top of the mold column is provided with an openable top cover, and the center of the top cover is provided with a lifting ring.

[0032] The beneficial effects of the spiral coiling machine provided by this utility model are as follows: Compared with the prior art, the spiral coiling machine of this utility model can bend the straight pipe into an arc segment before coiling. Then, the arc segment is fitted onto the part of the positioning pin of the mold column that protrudes from the peripheral wall of the mold column. This allows the positioning pin to position the arc segment, thereby ensuring that the mold column can drive the straight pipe to move synchronously during the coiling process. When the rotary support drives the mold column to rotate until the parts of the straight pipe on both sides of the arc segment enter the two mold openings respectively, the lifting mold starts to drive the two mold openings to rise synchronously. Thus, during the rotation of the mold column, the rising movement of the two mold openings can drive the parts of the straight pipe on both sides of the arc segment to coil around the peripheral wall of the mold column at the same time to form a double spiral pipe. The whole process only requires two processes, bending and coiling, to process the straight pipe into a double spiral pipe. This replaces the welding process and the coiling process with one bending process, which not only avoids the risk of leakage caused by weld breakage, but also improves processing efficiency. Attached Figure Description

[0033] Figure 1 A three-dimensional structural diagram of the spiral coil machine provided in this embodiment of the utility model. Figure 1 ;

[0034] Figure 2 A three-dimensional structural diagram of the spiral coil machine provided in this embodiment of the utility model. Figure 2 ;

[0035] Figure 3 A top view of the spiral coil machine provided in this embodiment of the utility model;

[0036] Figure 4 For along Figure 3 Schematic diagram of the cross-sectional structure along line AA;

[0037] Figure 5 For along Figure 3 Schematic diagram of the cross-sectional structure of the middle BB line;

[0038] Figure 6This is a schematic diagram of the bottom structure of the mold column used in the embodiment of this utility model;

[0039] Figure 7 This is a three-dimensional structural diagram of the rotary table used in the embodiments of this utility model;

[0040] Figure 8 A three-dimensional structural diagram of a double-helix tube obtained by spiral coil machining according to an embodiment of this utility model.

[0041] In the diagram: 10. Double helix fitting; 11. Helical section; 12. Bend section; 20. Frame; 30. Rotary support; 31. Shaft; 32. Rotary disk; 321. Clamping plate; 322. Guide post; 33. Gear ring; 34. Second rotating power component; 35. Gear; 40. Mold pillar; 41. Positioning pin; 411. Stepped through hole; 412. First fastener; 42. Groove; 43. Guide hole; 44. Insertion hole; 45. Pressure plate; 451. Second fastener; 46. Top cover; 461. Lifting ring; 50. Lifting mold; 500. Mold opening; 51. Bracket; 511. Column; 512. Optical axis; 513. Top plate; 52. Mold base; 521. Sliding sleeve; 522. End plate; 523. Middle plate; 53. Mold wheel; 54. Lifting drive component; 541. First rotating power component; 542. Drive screw; 543. Threaded sleeve. Detailed Implementation

[0042] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0043] It should be noted that when an element is referred to as being "set on" or "connected to" another element, it can be directly on or indirectly on the other element. It should be understood that the terms "upper," "lower," "front," "rear," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" or "several" means two or more, unless otherwise explicitly specified.

[0044] Please refer to the following: Figures 1 to 8 The spiral coiling machine provided by this utility model is described below. The spiral coiling machine is used to process double-spiral pipe fittings 10, where two spiral segments 11 of the double-spiral pipe fitting 10 are connected at the same end via a curved section 12. The spiral coiling machine includes a frame 20, a mold column 40, and a lifting mold 50. A rotary support 30 is rotatably connected to the frame 20. The mold column 40 is coaxially mounted on the rotary support 30 and is engaged with the rotary support 30 circumferentially. A protruding positioning pin 41 is provided at the lower end of the side wall of the mold column 40, and the positioning pin 41 is used to insert and position the curved section 12. The lifting mold 50 is located on the frame 20 and to the side of the mold column 40. Two mold openings 500 are formed between the lifting mold 50 and the peripheral wall of the mold column 40, and the two mold openings 500 are respectively suitable for the two spiral segments 11 to pass through. When the rotary support 30 drives the mold column 40 to rotate, the two mold openings 500 move upward synchronously, driving the two spiral segments 11 to coil around the mold column 40.

[0045] It should be noted that the spiral coiling machine provided in this embodiment is suitable for pre-bending straight pipe fittings by 180 degrees to obtain the curved section 12 and two parallel straight sections; of course, two straight pipe fittings can also be welded and fixed by a prefabricated 180-degree elbow to form the above-mentioned pipe fitting structure, but considering the high risk of leakage caused by cracks in the weld, the former is preferred.

[0046] Compared with the prior art, the spiral coiling machine provided in this embodiment can bend the straight pipe into a curved section 12 before coiling. Then, the curved section 12 is fitted onto the part of the positioning pin 41 of the mold column 40 that protrudes from the peripheral wall of the mold column 40. This allows the positioning pin 41 to position the curved section 12, thereby ensuring that the mold column 40 can drive the straight pipe to move synchronously during the coiling process. When the rotary support 30 drives the mold column 40 to rotate until the straight pipe is located on both sides of the curved section 12 and enters the two mold openings 500 respectively, the lifting mold 50 begins to move. The two mold openings 500 rise synchronously, thereby driving the straight pipe fitting located on both sides of the curved section 12 to simultaneously coil around the peripheral wall of the mold column 40 during the rotation of the mold column 40, forming a double helical pipe fitting 10. The entire process only requires two steps: bending and coiling, to process the straight pipe fitting into a finished double helical pipe fitting 10. Thus, a bending step replaces a welding step and a coiling step, which not only avoids the risk of leakage caused by weld breakage, but also improves processing efficiency.

[0047] In some embodiments, combined with Figure 1 and Figure 5The lifting mold 50 includes a support 51, two mold wheels 53, and a lifting drive 54. The support 51 is fixed to the frame 20 and is slidably connected to the mold base 52 in the vertical direction. The two mold wheels 53 are spaced apart vertically and rotatably connected to the mold base 52. The mold wheels 53 have grooves that match the diameter of the double helix pipe 10. The grooves and the peripheral wall of the mold column 40 form a mold opening 500. The lifting drive 54 is located on the frame 20 and its output end is connected to the mold base 52.

[0048] The bracket 51, fixed on the frame 20, not only needs to guide the mold base 52 to move up and down, but also needs to have sufficient structural strength to ensure the rolling pressure of the mold wheel 53 on the double helical tube 10. The lifting drive 54 can be a hydraulic or pneumatic telescopic cylinder, or a combination component that uses a motor and a linear transmission structure to achieve lifting at the output end. Considering that the mold wheel 53 needs to have a stable and precise rising speed during the coiling process, the latter is preferred for the lifting drive 54. The mold wheel 53 is a grooved wheel. During the coiling process, its grooves are used to roll the straight tube radially along the mold column 40, so that the straight tube continuously bends and fits against the peripheral wall of the mold column 40. On the other hand, the grooves can also be used to drive the straight tube to bend upward, so that it spirals around the mold column 40. Finally, the double helical tube 10 is obtained under the combined action of the two mold wheels 53.

[0049] As one specific embodiment of the aforementioned lifting drive component 54, please refer to Figure 5 The lifting drive component 54 includes a first rotating power component 541 and a threaded sleeve 543; wherein, the first rotating power component 541 is fixedly connected to the frame 20, and the output end is connected to a drive screw 542, the drive screw 542 extends vertically upward and is rotatably connected to the bracket 51; the threaded sleeve 543 is sleeved on the drive screw 542 and threadedly engaged with the drive screw 542, and the threaded sleeve 543 is fixedly connected to the mold base 52.

[0050] The first rotating power component 541 can be a motor or a hydraulic motor. The first rotating power component 541 drives the drive screw 542 to rotate, thereby driving the threaded sleeve 543 to move along the axial direction of the drive screw 542. In turn, the threaded sleeve 543 drives the mold base 52 to rise or fall. The driving method is simple and stable, and the lifting speed can be precisely controlled based on the rotation speed of the first rotating power component 541, thereby improving the forming quality of the double helix tube 10.

[0051] For some possible implementations, please refer to [link / reference]. Figure 5The support 51 includes a column 511, two optical axes 512, and a top plate 513; the column 511 is fixedly connected to the frame 20 and extends vertically upward; the two optical axes 512 are both fixedly connected to the frame 20 and are triangularly distributed with the column 511; the top plate 513 is fixedly connected to the top of the column 511 and the two optical axes 512; wherein, the mold base 52 is slidably connected to the column 511 and the two optical axes 512.

[0052] The column 511 and the two optical shafts 512 form a triangular support structure and are connected by the top plate 513 to ensure the overall structural strength. The mold base 52 can adopt a triangular structure, with its three corners connected to the column 511 and the two optical shafts 512 respectively. This ensures that the mold base 52 is subjected to balanced force, improves the stability of the mold base 52 driving the two mold wheels 53 to move up and down, and thus improves the forming quality of the double helix tube 10.

[0053] As an optional embodiment of the above-described mold base 52, please refer to Figure 5 The mold base 52 includes a sliding sleeve 521, two end plates 522, and a middle plate 523. The sliding sleeve 521 is slidably fitted onto the column 511 and rotatably connected to two mold wheels 53. The two end plates 522 are respectively fixedly connected to the upper and lower ends of the sliding sleeve 521 and are slidably fitted onto two optical shafts 512. Both end plates 522 are provided with clearance holes suitable for the drive screw 542 to pass through. The middle plate 523 is fixedly connected to the middle part of the sliding sleeve 521 and slidably connected to the two optical shafts 512. The part of the middle plate 523 located between the two optical shafts 512 is fixedly connected to a threaded sleeve 543. The two mold wheels 53 are located between the two end plates 522 and are located on both sides of the middle plate 523.

[0054] The sliding sleeve 521 serves as the connecting base for the two mold wheels 53 and forms a sliding fit with the column 511. At the same time, end plates 522 are set at its upper and lower ends. The end plates 522 slide up and down with the two optical shafts 512, thereby increasing the axial contact length of the sliding pair and thus improving the motion stability. On this basis, the middle plate 523 located between the two end plates 522 serves as the mounting base for the threaded sleeve 543. The power transmitted from the drive screw 542 to the threaded sleeve 543 is transmitted to the sliding sleeve 521 through the middle plate 523, and then from the sliding sleeve 521 to the two end plates 522. This helps to improve the balance of power transmission and thus improve the smoothness of the lifting and lowering of the mold base 52.

[0055] For example, please refer to Figure 2 , Figure 4 and Figure 6The rotary support 30 includes a rotating shaft 31, a rotary disk 32, a gear ring 33, and a second rotary power component 34. The rotating shaft 31 is rotatably connected to the center of the frame 20. The rotary disk 32 is fixedly connected to the upper end of the rotating shaft 31 to support the mold column 40 and forms a circumferential engagement with the lower end of the mold column 40. The gear ring 33 is fixedly sleeved on the lower end of the rotating shaft 31. The second rotary power component 34 is fixedly connected to the frame 20 and a gear 35 is sleeved on its output end. The gear 35 meshes with the gear ring 33.

[0056] A platform can be installed on the top of the frame 20. A bearing seat is installed at the center of the platform to cooperate with the rotating shaft 31. The disc surface of the rotary table 32 supports the bottom surface of the mold column 40 as a whole. At the same time, the rotary table 32 is provided with a structure that engages with the bottom wall of the mold column 40 to ensure the stability of the mold column 40 rotating synchronously with the rotary table 32. The second rotating power component 34 can be a motor or a hydraulic motor. The gear 35 sleeved on the output end of the second rotating power component 34 drives the gear ring 33 to rotate, which in turn drives the rotating shaft 31 fixed to the gear ring 33 to rotate. Finally, the rotary table 32 drives the mold column 40 to rotate. Since the gear 35 and the gear ring 33 can more easily obtain a larger transmission ratio, the principle of speed reduction and torque increase can be used to ensure that the rotary table 32 can obtain sufficient rotational driving force, thereby avoiding the problem of insufficient power.

[0057] In some embodiments, see Figures 4 to 7 The connection structure between the mold column 40 and the rotary table 32 is as follows: the bottom wall of the mold column 40 is provided with a groove 42 at the center, and the bottom of the groove 42 is provided with a guide hole 43; the rotary table 32 is provided with a card plate 321 that is suitable for embedding into the groove 42 and forming a circumferential engagement with the groove 42, and the card plate 321 is provided with a guide post 322, which is inserted into the guide hole 43.

[0058] The shape of the groove 42 and the clamping plate 321 are matched. Specifically, the clamping plate 321 can be a structure with a central circle combined with multiple radial parts on the outer periphery. The central circle is used for center positioning, and the radial parts are used to form a snap-fit ​​with the corresponding parts of the groove 42 to restrict the relative rotational freedom of the mold column 40 and the connecting plate. On this basis, when installing the mold column 40, the guide post 322 can be inserted into the guide hole 43 first. The insertion and cooperation between the guide post 322 and the guide hole 43 guides the clamping plate 321 to be accurately embedded in the groove 42. This not only helps to improve the convenience of assembly operation, but also improves the installation position accuracy of the mold column 40, thereby ensuring the forming quality of the double helix tube 10.

[0059] In some embodiments, see Figure 4 and Figure 6 The lower end of the side wall of the mold column 40 is provided with an insertion hole 44. The positioning pin 41 is inserted and fixed in the insertion hole 44, and a pressure plate 45 is detachably connected to the positioning pin 41. The pressure plate 45 cooperates with the side wall of the mold column 40 to clamp the curved section 12.

[0060] The insertion and engagement of the positioning pin 41 with the insertion hole 44 can improve the load-bearing capacity of the positioning pin 41 along the circumference of the mold column 40, thereby improving the positioning reliability of the positioning pin 41 on the curved part. On this basis, the pressure plate 45 can be pressed on the curved part to prevent the curved part from detaching from the positioning pin 41, thereby improving the stability of the curved part on the positioning pin 41.

[0061] Specifically, please refer to Figure 4 In this embodiment, the center of the positioning pin 41 is provided with a stepped through hole 411, and a first fastener 412 connected to the mold column 40 is inserted in the stepped through hole 411. The large diameter end of the stepped through hole 411 is provided with a threaded section, and a second fastener 451 connected to the threaded section is inserted on the pressure plate 45.

[0062] Both the first fastener 412 and the second fastener 451 can be bolts. The first fastener 412 passes through the small-diameter portion of the stepped through-hole 411 and is screwed onto the mold post 40. Its operating end presses against the stepped surface of the stepped through-hole 411, thereby fixing the positioning pin 41 to the mold post 40 and preventing the positioning pin 41 from slipping out of the insertion hole 44. The large-diameter portion of the stepped through-hole 411 can not only accommodate the operating end of the first fastener 412, but also has a threaded section that is not interfered with by the first fastener 412, thus facilitating the screwing and fixing of the second fastener 451 that passes through the pressure plate 45. The structure is simple and compact.

[0063] Considering that the axial spacing between the two spiral segments 11 of the double spiral pipe fitting 10 varies with different requirements, the radius of the corresponding curved segment 12 will also change accordingly. Therefore, the positioning pin 41 and the mold column 40 adopt the above-mentioned detachable connection method, which can match the double spiral pipe fitting 10 of different sizes by replacing the positioning pin 41 of different sizes, thereby improving the processing applicability.

[0064] It should be noted that, in this embodiment, as Figure 4 As shown, the mold column 40 is a hollow column, and its top is equipped with an openable top cover 46. A lifting ring 461 is located at the center of the top cover 46. The hollow mold column 40 reduces material consumption and costs. It also allows sand to be added to the hollow cavity after the top cover 46 is opened to increase its weight, thereby improving the stability of the mold column 40 when placed on the slewing support 30 under its own weight. The top cover 46 and the mold column 40 can be detachably connected by screws or a rotating snap-fit. At the same time, the lifting ring 461 located at the center of the top cover 46 facilitates the hoisting of the mold column 40, improving operational convenience.

[0065] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A spiral coiling machine, characterized in that, For processing double-helix pipe fittings, wherein the two helical segments of the double-helix pipe fitting are connected at the same end by a bend; the spiral coiling machine includes: The frame is swivelly connected with a slewing bearing; The mold column is coaxially mounted on the slewing support and is engaged with the slewing support circumferentially. The lower end of the side wall of the mold column is provided with a protruding positioning pin, which is used to insert and position the curved segment. A lifting mold is provided on the frame and located on the side of the mold column. Two mold openings are formed between the lifting mold and the peripheral wall of the mold column. The two mold openings are respectively adapted to allow the two spiral segments to pass through. When the slewing support drives the mold column to rotate, the two mold openings move upward synchronously, causing the two spiral segments to coil around the mold column.

2. The spiral coil machine as described in claim 1, characterized in that, The lifting mold includes: A bracket is fixed to the frame and slidably connected to a mold base in the vertical direction; Two mold wheels are spaced apart vertically and rotatably connected to the mold base. The mold wheels have grooves that match the diameter of the double-helix pipe fitting. The mold opening is formed between the grooves and the peripheral wall of the mold column. A lifting drive component is mounted on the frame and its output end is connected to the mold base.

3. The spiral coil machine as described in claim 2, characterized in that, The lifting drive component includes: The first rotating power component is fixedly connected to the frame, and its output end is connected to a drive screw. The drive screw extends vertically upward and is rotatably connected to the support. A threaded sleeve is fitted onto the drive screw and threadedly engaged with the drive screw, and the threaded sleeve is fixedly connected to the mold base.

4. The spiral coil machine as described in claim 3, characterized in that, The support includes: The column is fixedly connected to the frame and extends vertically upward; Both optical axes are fixedly connected to the frame and are triangularly distributed with the column; The top plate is fixedly connected to the top of the column and the two optical axes; The mold base is slidably connected to the column and the two optical axes.

5. The spiral coil machine as described in claim 4, characterized in that, The mold base includes: A sliding sleeve is fitted onto the column and rotatably connected to two mold wheels; Two end plates are fixedly connected to the upper and lower ends of the sliding sleeve, and both are slidably sleeved on the two optical axes. Both end plates are provided with clearance holes suitable for the drive screw to pass through. The middle plate is fixedly connected to the middle part of the sliding sleeve and slidably connected to the two optical axes. The threaded sleeve is fixedly connected to the middle plate at the part between the two optical axes. The two mold wheels are located between the two end plates and on both sides of the middle plate, respectively.

6. The spiral coil machine as described in claim 1, characterized in that, The slewing bearing includes: A rotating shaft is rotatably connected to the center of the frame; A rotary table is fixedly connected to the upper end of the rotating shaft, used to support the mold column and form a circumferential engagement with the lower end of the mold column; A gear ring is fixedly fitted onto the lower end of the rotating shaft; The second rotating power component is fixedly connected to the frame and has a gear sleeved at its output end, the gear meshing with the gear ring.

7. The spiral coil machine as described in claim 6, characterized in that, The bottom wall of the mold column is provided with a groove at its center, and the bottom of the groove is provided with a guide hole at its center; the rotary table is provided with a card plate suitable for embedding into the groove and forming a circumferential engagement with the groove, and the card plate is provided with a guide post, which is inserted into the guide hole.

8. The spiral coil machine as described in claim 1, characterized in that, The lower end of the side wall of the mold column is provided with an insertion hole, the positioning pin is inserted and fixed in the insertion hole, and a pressure plate is detachably connected to the positioning pin. The pressure plate cooperates with the side wall of the mold column to clamp the curved segment.

9. The spiral coil machine as described in claim 8, characterized in that, The positioning pin has a stepped through hole at its center, a first fastener connected to the mold column passes through the stepped through hole, and the large diameter end of the stepped through hole has a threaded section, and a second fastener connected to the threaded section passes through the pressure plate.

10. The spiral coiling machine according to any one of claims 1-9, characterized in that, The mold column is a hollow column, and the top of the mold column is provided with an openable top cover, and the center of the top cover is provided with a lifting ring.

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