A can body necking device

Abstract

This utility model relates to the field of necking device technology, specifically disclosing a can necking device, including a frame, a rotating shaft, a vent pipe, a star wheel, a pusher assembly, and a mold assembly. The rotating shaft is rotatably mounted on the frame, with a through hole at its center. The vent pipe is fixedly mounted on the frame, containing independent negative pressure and atmospheric channels. The star wheel is fixedly mounted on the rotating shaft. The pusher assembly includes a pusher rod, a pressing pad, a slide rail, and a pusher ring plate. The mold assembly includes a protective sleeve, a forming mold, a fixing sleeve, a demolding pusher rod, and a demolding ring plate. This utility model uses the adsorption groove on the star wheel in conjunction with the negative pressure channel to adsorb and fix the can. During the rotation of the rotating shaft, the pusher assembly and the mold assembly cooperate to achieve automatic pushing, necking, and demolding of the can, eliminating the need for frequent manual loading and unloading, greatly shortening the loading and unloading time, enabling continuous production of cans, and significantly improving production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of necking device technology, and in particular to a tank necking device. Background Technology

[0002] Two-piece cans consist of a can body and a can lid, hence the name "two-piece can." During the manufacturing process, the can body requires necking at the mouth. Some necking machines can only process one type of can body. When necking cans of the same diameter but different lengths is needed, a newer necking machine is required, making it impractical.

[0003] Some models of necking machines can perform necking operations on different types of cans by adjusting the extrusion stroke required for the necking operation. For example, patent CN118287592B discloses a can necking device, which mainly includes a housing. The inner wall of the housing is fixedly provided with a limiting slide rail one and a limiting slide rail two. The limiting slide rail one is located above the limiting slide rail two. A central rotating shaft is rotatably connected inside the housing. Rotary adjusting rings are slidably connected to the upper and lower ends of the central rotating shaft. A rotating seat one is fixedly connected to the rotating adjusting ring. Fixed frames are fixedly connected to the top and bottom of the housing. A drive motor is fixedly connected to the center of the fixed frame on the top of the housing.

[0004] The aforementioned patent employs a compression stroke adjustment mechanism. Driven by an electric push rod, the rotating adjustment ring slides on the central shaft, causing the upper pressure rod to swing. With the combined limiting effect of two sets of upper pressure rods, the limiting slide can maintain a vertical posture while moving away from or towards the central shaft, thus adjusting the compression stroke required for the necking operation to accommodate more types of cans. However, this patent requires the can to be placed on a base for loading and removed from the base for unloading. This loading and unloading process is time-consuming, hindering continuous production and resulting in low production efficiency. Utility Model Content

[0005] The purpose of this utility model is to provide a tank necking device to solve the problems of long loading and unloading time, inability to produce continuously, and low production efficiency of the existing tank necking machine.

[0006] To achieve the above objectives, this utility model provides a tank necking device, including a frame, a rotating shaft, a vent pipe, a star wheel, a pusher assembly, and a mold assembly.

[0007] The rotating shaft is rotatably mounted on the frame. A through hole is provided in the center of the rotating shaft. The vent pipe is fixedly mounted on the frame and is coaxial with the rotating shaft. The vent pipe has independent negative pressure channels and atmospheric channels. The negative pressure channels are connected to a negative pressure source, and the atmospheric channels are connected to the atmosphere. The rotating shaft has multiple first negative pressure holes that are connected to the through hole in the radial direction. The first negative pressure holes can be connected to the negative pressure channels and the atmospheric channels. The star wheel is fixedly mounted on the rotating shaft. Multiple evenly distributed adsorption grooves for accommodating the tank are provided on the outer cylindrical surface of the star wheel. The bottom of the adsorption grooves is provided with second negative pressure holes. The second negative pressure holes correspond one-to-one with the first negative pressure holes and are connected.

[0008] The pusher assembly corresponds one-to-one with the adsorption groove. The pusher assembly includes a pusher rod, a pressure pad, a slide rail, and a pusher ring plate. The slide rail is fixedly mounted on the rotating shaft, and the pusher rod is fixedly mounted on the slider of the slide rail. The pressure pad is fixed to one end of the pusher rod facing the mold assembly. The pusher ring plate is fixedly connected to the frame and has a pusher guiding surface. When the rotating shaft rotates, the pusher rod can move axially under the action of the pusher guiding surface to move closer to or away from the mold assembly.

[0009] The mold assembly corresponds one-to-one with the pusher assembly. The mold assembly includes a protective sleeve, a forming mold, a fixed sleeve, a demolding push rod, and a demolding ring plate. The fixed sleeve is fixedly connected to the rotating shaft, the demolding push rod is slidably connected to the fixed sleeve, the forming mold is fixedly connected to the demolding push rod, the protective sleeve is fixedly connected to the fixed sleeve, and the forming mold is slidably connected to the protective sleeve. The forming mold has a conical surface on the side facing the pusher assembly for forming the neck of the can. The demolding ring plate is fixedly connected to the frame and has a demolding guide surface. When the rotating shaft rotates, the push rod can move axially under the action of the demolding guide surface to move closer to or away from the pusher assembly.

[0010] Furthermore, a first partition is fixed inside the vent pipe, which divides the vent pipe into an adsorption channel and a high-pressure channel. A second partition is fixed inside the adsorption channel, which divides the adsorption channel into a negative pressure channel and an atmospheric channel. The high-pressure channel is connected to a high-pressure gas source. The rotating shaft has multiple high-pressure holes that communicate with the through holes in a radial direction. Each high-pressure hole corresponds to a demolding push rod. The demolding push rod is a hollow rod and is connected to its corresponding high-pressure hole through a connecting pipe. The high-pressure hole can communicate with the high-pressure channel.

[0011] In the above scheme, the vent pipe is divided into multiple independent channels by the first and second partitions, realizing the integration of multiple functions such as negative pressure adsorption, atmospheric release, and high-pressure demolding. The connection design between the high-pressure channel and the demolding push rod allows the high-pressure gas generated by the high-pressure gas source to enter the demolding push rod through the high-pressure channel, high-pressure hole, and connecting pipe when the can is pushed out of the protective sleeve. The gas pressure is used to quickly separate the formed can from the conical surface of the forming mold.

[0012] Furthermore, a negative pressure adsorption sleeve and a high-pressure blowing sleeve are fixed on the vent pipe. Both the negative pressure adsorption sleeve and the high-pressure blowing sleeve are rotatably and sealingly connected to the through hole. The rotating shaft 2 is provided with a negative pressure connection port, an atmospheric connection port and a blowing port. The negative pressure connection port is connected to the negative pressure channel, the atmospheric connection port is connected to the atmospheric channel, and the blowing port is connected to the high-pressure channel. The negative pressure adsorption sleeve is provided with a negative pressure connection port connected to the negative pressure connection port and an atmospheric connection port connected to the atmospheric connection port. The high-pressure blowing sleeve is provided with a blowing port connected to the blowing port. The first negative pressure hole can be rotated to a position connected to the negative pressure connection port and a position connected to the atmospheric connection port. The high-pressure hole can be rotated to a position connected to the blowing port.

[0013] In the above scheme, the installation of the negative pressure adsorption sleeve and the high-pressure blowing sleeve ensures stable communication between the first negative pressure hole and the high-pressure hole and the various channels in the vent pipe during the rotation of the shaft. By designing different connection ports and connecting ports, it is ensured that the corresponding gas channels can be accurately connected at different stages of tank processing, such as adsorption, release, and demolding. The rotary sealing connection ensures the sealing of the gas channels during rotation, prevents gas leakage, and guarantees the normal operation of functions such as negative pressure adsorption, atmospheric release, and high-pressure demolding, thereby improving the stability and reliability of the device operation.

[0014] Furthermore, it also includes a double-pass rotary joint and a single-pass rotary joint, wherein the two channels of the double-pass rotary joint are respectively connected to the negative pressure channel and the atmospheric channel, and the single-pass rotary joint is connected to the high-pressure channel.

[0015] In the above scheme, the negative pressure channel is connected to the negative pressure source via a double-port rotary joint, and the atmospheric channel is connected to clean air via a double-port rotary joint. The use of double-port and single-port rotary joints solves the connection problem of gas channels during shaft rotation, ensuring stable connections between the negative pressure source, the atmosphere, the high-pressure gas source, and each channel within the ventilation pipe. The double-port rotary joint enables independent connection between the negative pressure channel and the atmospheric channel, while the single-port rotary joint enables connection of the high-pressure channel, ensuring that all gas channels remain unobstructed while the shaft continues to rotate. This provides a stable gas supply for operations such as adsorption, release, and demolding of the tank, guaranteeing continuous production of the unit.

[0016] Furthermore, the pusher assembly also includes a first pre-pressing platform, a first pull-back follower wheel, a first ejection follower wheel, a first guide rod, a first spring, a first mounting base, and an adjusting base. The adjusting base is fixedly connected to the frame. The adjusting base has multiple sets of internal threaded holes, each set of internal threaded holes corresponding to each of the first mounting bases. Each set of internal threaded holes includes multiple internal threaded holes arranged in a straight line along the axis of rotation. The first mounting base is connected to the adjusting base by bolts. The bolts can selectively be threaded to one of the internal threaded holes. The pusher ring plate is fixedly connected to the first mounting base. A first guide rod is fixed on the pusher rod. The first guide rod is slidably connected to the first pre-pressing platform. A first spring is installed between the first pre-pressing platform and the pusher rod. The first ejection follower wheel is rotatably mounted on the pusher rod and is rollingly connected to the pusher guide surface. The first pull-back follower wheel is rotatably mounted on the first pre-pressing platform and is rollingly connected to the first mounting base.

[0017] In the above scheme, the first guide rod and the first pre-pressing table provide guidance for the push rod, ensuring that the push rod will not deviate during movement and improving the accuracy of pushing. The first spring provides the reset power for the push rod, and after pushing is completed, the push rod automatically resets with the help of the spring force. The first ejector follower wheel cooperates with the push guide surface to realize the pushing action, and the first pull-back follower wheel cooperates with the first mounting base to assist the push rod in resetting. The mating surfaces of the first mounting base and the first pull-back follower wheel are flat. The adjustable connection between the multiple sets of internal threaded holes on the adjusting seat and the first mounting base allows the position of the push ring plate to be adjusted according to the processing requirements of different tank specifications, thereby changing the stroke of the push rod, enhancing the adaptability of the device to different tanks, and expanding the application range of the equipment.

[0018] Furthermore, the push rod is provided with a first mounting groove, and the end of the first guide rod away from the first pre-compression table is fixedly installed in the first mounting groove.

[0019] In the above scheme, the distance between the first ejector follower wheel and the first retractor follower wheel is small, making it difficult to meet the installation space requirements of the first spring. By setting a first mounting groove, the accommodating length of the first spring can be increased, allowing the first spring to have a longer length, which facilitates adaptation to the stroke of the push rod and meets the extension / retraction requirements.

[0020] Furthermore, the mold assembly also includes a second pre-pressing platform, a second pull-back follower wheel, a second ejection follower wheel, a second guide rod, a second spring, a second mounting base, and a fixed base. The fixed base is fixedly connected to the frame, the second mounting base is fixedly mounted on the fixed base, the demolding ring plate is fixedly connected to the second mounting base, the second guide rod is fixed on the demolding push rod, the second guide rod is slidably connected to the second pre-pressing platform, a second spring is installed between the second pre-pressing platform and the demolding push rod, the second ejection follower wheel is rotatably mounted on the demolding push rod, the second ejection follower wheel is rollingly connected to the demolding guide surface, the second pull-back follower wheel is rotatably mounted on the second pre-pressing platform, and the second pull-back follower wheel is rollingly connected to the second mounting base.

[0021] In the above scheme, the second guide rod and the second pre-pressing platform guide the demolding push rod, ensuring that the demolding push rod maintains linear motion during movement and improving demolding accuracy. The second spring provides the reset power for the demolding push rod, causing it to automatically reset after demolding. The second ejector follower wheel cooperates with the demolding guide surface to realize the demolding action, and the second pull-back follower wheel cooperates with the second mounting base to assist in the reset of the demolding push rod. This structural design ensures the movement accuracy of the molding die during necking and demolding processes, improving the quality of tank necking molding and demolding efficiency.

[0022] Furthermore, a second mounting groove is provided on the demolding push rod, and the end of the second guide rod away from the second pre-compression table is fixedly installed in the second mounting groove.

[0023] In the above scheme, the distance between the second ejector follower wheel and the second pull-back follower wheel is small, making it difficult to meet the installation space requirements for the second spring. By setting a second mounting groove, the accommodating length of the second spring can be increased, allowing the second spring to have a longer length, which facilitates adaptation to the stroke of the demolding push rod and meets the extension / retraction requirements.

[0024] Furthermore, the protective sleeve is provided with a first shoulder, and the fixed sleeve has an outwardly protruding ring portion at one end near the protective sleeve. The outer wall of the ring portion is provided with external threads, and an installation sleeve is threadedly connected to the ring portion. One end of the installation sleeve has a clamping portion, which clamps the first shoulder onto the ring portion.

[0025] In the above solution, a secure connection between the protective sleeve and the fixed sleeve is achieved through the threaded connection between the mounting sleeve and the fixed sleeve, as well as the clamping action of the clamping part on the first shoulder. This connection method facilitates the installation and disassembly of the protective sleeve, while ensuring that the protective sleeve will not loosen during equipment operation, thus providing good protection for the molding die and preventing external debris from entering and affecting the normal operation of the molding die.

[0026] Furthermore, the demolding push rod is provided with a second shoulder and a third shoulder. The second shoulder abuts against the forming mold. The inner wall of the forming mold is provided with a boss. A nut is threaded onto the demolding push rod. A washer is fitted onto the demolding push rod. The nut presses the washer tightly onto the boss and the third shoulder.

[0027] In the above solution, the molding die and the demolding push rod are detachably and fixedly connected by the cooperation of nuts, washers, second and third protruding shoulders, and bosses. This connection method makes the replacement of the molding die more convenient and quick. When different specifications of tanks need to be processed, only the nuts need to be removed to replace the corresponding molding die, which improves the versatility and flexibility of the equipment and meets diverse production needs.

[0028] Compared with existing technologies, this technical solution has at least one of the following beneficial effects:

[0029] 1. This utility model uses the adsorption groove on the star wheel and the negative pressure channel to adsorb and fix the can body. During the rotation of the shaft, the pusher assembly and the mold assembly cooperate with each other to realize the automatic pushing, necking and molding of the can body and demolding operation. There is no need for frequent manual loading and unloading, which greatly shortens the loading and unloading time, enables continuous production of can bodies, and significantly improves production efficiency.

[0030] 2. Through the push-pull guiding curved surface of the push-pull ring plate and the demolding guiding curved surface of the demolding ring plate, as well as the corresponding first follower wheel, first guide rod and first spring, second follower wheel, second guide rod and second spring, the automatic movement of the push-pull rod and the demolding rod is realized. The operation process is simple and convenient, without complicated operation steps and additional drive devices, and the structure is compact.

[0031] 3. By adjusting the different connection methods between the multiple sets of internal threaded holes on the adjusting seat and the first mounting seat, the position of the pusher assembly can be adjusted to adapt to the processing requirements of tanks of different specifications; at the same time, the structural design of the mold assembly also makes it easy to replace and adjust the forming mold, further improving the applicability of the device to different types of tanks.

[0032] 4. The high-pressure channel inside the vent pipe is connected to the demolding push rod. During demolding, the high-pressure gas source introduces high-pressure gas into the demolding push rod through the high-pressure channel, which can quickly and effectively push the molded can out of the mold, ensuring smooth demolding and improving the stability and reliability of production. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of a tank necking device according to an embodiment;

[0034] Figure 2 This is a schematic diagram illustrating the process of a tank necking device for necking a tank according to one embodiment.

[0035] Figure 3 A top sectional view of a feeder assembly according to one embodiment;

[0036] Figure 4 for Figure 1 A sectional view along line AA.

[0037] Figure 5 for Figure 1 Sectional view along the BB line;

[0038] Figure 6 for Figure 1 A magnified view of a portion of point C in the middle;

[0039] Figure 7 for Figure 1 A magnified view of a portion of point D in the middle;

[0040] 1. Frame; 2. Shaft; 3. Vent pipe; 4. Star wheel; 5. Pusher assembly; 6. Mold assembly; 7. Tank; 8. Through hole; 9. Negative pressure channel; 10. Atmospheric channel; 11. First negative pressure hole; 12. Adsorption groove; 13. Second negative pressure hole; 14. Pusher rod; 15. Extrusion pad; 16. Slide rail; 17. Pusher ring plate; 18. Pusher guide surface; 19. Boss; 20. Nut; 21. Washer; 22. Protective sleeve; 23. Molding mold; 24. Fixing sleeve; 25. Demolding pusher rod; 26. Demolding ring plate; 27. Fixing bracket; 28. Conical surface; 29. ​​Demolding guide surface; 30. First pre-compression platform; 31. First pull-back follower wheel; 32. First ejection follower wheel; 33. First guide rod; 34. First spring; 35. First mounting base; 36. Adjusting base; 37. 38. Internal threaded hole; 39. Second pre-compression table; 40. Second pull-back follower wheel; 41. Second ejection follower wheel; 42. Second guide rod; 43. Second spring; 44. Second mounting base; 45. Fixed base; 46. First partition plate; 47. Adsorption channel; 48. High pressure channel; 49. Second partition plate; 50. Second shoulder; 51. High pressure hole; 52. Connecting pipe; 53. Negative pressure adsorption sleeve; 54. High pressure blowing sleeve; 55. Negative pressure connection port; 56. Atmospheric connection port; 57. Blowing connection port; 58. Negative pressure connection port; 59. Atmospheric connection port; 60. Double-pass rotary joint; 61. Single-pass rotary joint; 62. Second mounting groove; 63. First shoulder; 64. Ring body; 65. Third shoulder; 66. Mounting sleeve; 67. Pressing part; 68. First mounting groove. Detailed Implementation

[0041] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0042] Please see Figures 1 to 7 As shown in the figure, this application provides a tank necking device, including a frame 1, a rotating shaft 2, a vent pipe 3, a star wheel 4, a pusher assembly 5, and a mold assembly 6.

[0043] The rotating shaft 2 is rotatably mounted on the frame 1 via bearings. The rotating shaft 2 has a through hole 8 at its center. The vent pipe 3 is fixedly mounted on the frame 1 and is rotatably mounted in the through hole 8 via bearings. The vent pipe 3 is coaxially arranged with the rotating shaft 2. The vent pipe 3 has an independent negative pressure channel 9 and an atmospheric channel 10. The negative pressure channel 9 is connected to a negative pressure source, which can be a vacuum pump. The atmospheric channel 10 is connected to the atmosphere. The rotating shaft 2 has multiple first negative pressure holes 11 radially opened, which are connected to the through hole 8. The first negative pressure holes 11 can be connected to the negative pressure channel 9 and the atmospheric channel 10. The star wheel 4 is fixedly mounted on the rotating shaft 2. The outer cylindrical surface of the star wheel 4 has multiple evenly distributed adsorption grooves 12 for accommodating the tank 7. The bottom of the adsorption groove 12 has a second negative pressure hole 13, which corresponds to and is connected to the first negative pressure holes 11.

[0044] Specifically, the rotating shaft 2, as the core rotating component of the device, has a through hole 8 that works in conjunction with the negative pressure channel 9 and atmospheric channel 10 within the vent pipe 3 to achieve negative pressure adsorption and atmospheric release functions on the adsorption groove 12 of the star wheel 4. When the canister 7 needs to be adsorbed, the negative pressure source generates negative pressure in the adsorption groove 12 through the negative pressure channel 9, the first negative pressure hole 11, and the second negative pressure hole 13, adsorbing the canister 7 onto the star wheel 4. When the processing is complete and the canister 7 needs to be released, the atmospheric channel 10 connects, restoring atmospheric pressure within the adsorption groove 12, facilitating the detachment of the canister 7. This design achieves automatic fixing and unloading of the canister 7 without manual operation, improving production efficiency and ensuring the stability of the canister 7 during processing.

[0045] The pusher assembly 5 corresponds one-to-one with the adsorption groove 12. The pusher assembly 5 includes a pusher rod 14, a pressing pad 15, a slide rail 16, and a pusher ring plate 17. The slide rail 16 is fixedly mounted on the rotating shaft 2, and the pusher rod 14 is fixedly mounted on the slider of the slide rail 16. The pressing pad 15 is fixed to one end of the pusher rod 14 facing the mold assembly 6. The pressing pad 15 is detachably connected to the pusher rod 14 by bolts for easy replacement. The pusher ring plate 17 is fixedly connected to the frame 1. The pusher ring plate 17 has a pusher guiding surface 18. When the rotating shaft 2 rotates, the pusher rod 14 can move axially under the action of the pusher guiding surface 18 to move closer to or away from the mold assembly 6. The pusher guiding surface 18 includes a portion with gradually increasing thickness, a portion with gradually decreasing thickness, and a portion with the same thickness.

[0046] Specifically, the slide rail 16 provides a stable sliding track for the push rod 14, ensuring that the push rod 14 can move precisely along the axial direction. The push guide surface 18 of the push ring plate 17 cooperates with the push rod 14, allowing the push rod 14 to move axially while rotating, thereby moving closer to or further away from the mold assembly 6. Through the special shape of the push guide surface 18, the stroke and movement trajectory of the push rod 14 are precisely controlled, ensuring the accuracy and stability of feeding, and at the same time providing conditions to avoid interference between the push rod 14 and the tank 7 during the subsequent demolding process.

[0047] The mold assembly 6 corresponds one-to-one with the pusher assembly 5. The mold assembly 6 includes a protective sleeve 22, a forming mold 23, a fixed sleeve 24, a demolding push rod 25, and a demolding ring plate 26. The fixed sleeve 24 is fixedly connected to the rotating shaft 2, the demolding push rod 25 is slidably connected to the fixed sleeve 24, the forming mold 23 is fixedly connected to the demolding push rod 25, the protective sleeve 22 is fixedly connected to the fixed sleeve 24, and a fixed bracket 27 is fixedly fixed to the lower end of the fixed sleeve 24. The fixed bracket 27 is connected to the rotating shaft 2 by screws. The bolt is detachable, facilitating the replacement of the fixing sleeve 24 and the mold assembly 6. The forming mold 23 is slidably connected to the protective sleeve 22. The side of the forming mold 23 facing the pusher assembly 5 has a conical surface 28 for forming the neck of the tank 7. The demolding ring plate 26 is fixedly connected to the frame 1. The demolding ring plate 26 has a demolding guide surface 29. When the rotating shaft 2 rotates, the demolding push rod 25 can move axially under the action of the demolding guide surface 29, driving the forming mold 23 closer to or away from the protective sleeve 22. The demolding guide surface 29 includes a portion with gradually increasing thickness, a portion with gradually decreasing thickness, and a portion with the same thickness.

[0048] Specifically, the fixed sleeve 24 provides a rotational base for the demolding push rod 25 and the forming mold 23; the demolding push rod 25 is slidably connected to the fixed sleeve 24, and in conjunction with the demolding guide surface 29 of the demolding ring plate 26, it achieves precise motion control of the forming mold 23. Under the guidance of the demolding guide surface 29, the stable movement trajectory of the forming mold 23 is ensured, so that the push rod 14 can smoothly push the can 7 to the conical surface 28 of the forming mold 23 to complete the necking. After the necking is completed, the demolding guide surface 29 guides and pushes the demolding push rod 25 and the forming mold 23 to move, pushing the can 7 out of the protective sleeve 22, ensuring that the entire processing process is smooth and safe, and improving the reliability of equipment operation and processing quality.

[0049] In some embodiments, please refer to Figure 1 and Figure 3 As shown, to enable the pusher rod 14 to move axially under the action of the pusher guide surface 18, the pusher assembly 5 also includes a first preload table 30, a first pull-back follower wheel 31, a first ejection follower wheel 32, a first guide rod 33, a first spring 34, a first mounting base 35, and an adjusting base 36. The adjusting base 36 is fixedly connected to the frame 1. The adjusting base 36 has multiple sets of internal threaded holes 37, each set of internal threaded holes 37 corresponding to each first mounting base 35. Each set of internal threaded holes 37 includes multiple internal threaded holes 37 arranged in a straight line along the axis of the rotating shaft 2. The first mounting base 35 is connected to the adjusting base 36 by bolts. The seat 36 is connected, and the bolt can be selectively threaded into one of the internal threaded holes 37. The pusher ring plate 17 is fixedly connected to the first mounting seat 35. The pusher rod 14 is fixed with a first guide rod 33, which is slidably connected to the first pre-pressing table 30. A first spring 34 is installed between the first pre-pressing table 30 and the pusher rod 14. The first ejector follower wheel 32 is rotatably mounted on the pusher rod 14 and is rollably connected to the pusher guide surface 18. The first pull-back follower wheel 31 is rotatably mounted on the first pre-pressing table 30 and is rollably connected to the first mounting seat 35.

[0050] Specifically, when the rotating shaft 2 rotates, the first ejector follower wheel 32 rolls on the gradually thickening portion of the pusher guide surface 18, thereby pushing the pusher rod 14 to move axially and push the can 7 adsorbed in the adsorption groove 12 toward the mold assembly 6. During the pushing process, the first pre-pressing table 30, the first spring 34, and the first guide rod 33 play a buffering and guiding role to ensure the smoothness of the pushing process; the first pull-back follower wheel 31 is rolledly connected to the first mounting base 35, and after the pushing is completed, the auxiliary pusher rod 14 is reset under the action of the first spring 34.

[0051] It should be noted that by adjusting the multiple sets of internal threaded holes 37 on the adjusting seat 36 and connecting them to the first mounting seat 35 in different ways, the position of the pusher ring plate 17 can be adjusted, thereby changing the stroke of the pusher rod 14 to adapt to the pushing requirements of tanks 7 of different specifications.

[0052] In some embodiments, please refer to Figure 1 and Figure 3 As shown, the push rod 14 has a first mounting groove 68, and the end of the first guide rod 33 away from the first pre-compression table 30 is fixedly installed in the first mounting groove 68.

[0053] In the above scheme, the distance between the first ejector follower wheel 32 and the first pull-back follower wheel 31 is small, making it difficult to meet the installation space requirements of the first spring 34. By setting the first mounting groove 68, the accommodating length of the first spring 34 can be increased, allowing the first spring 34 to have a longer length, which facilitates adaptation to the stroke of the push rod 14 and meets the extension and retraction requirements.

[0054] In some embodiments, please refer to Figure 1 As shown, to enable the push rod 14 to move axially under the action of the push guide surface 18, the mold assembly 6 also includes a second pre-pressing platform 38, a second pull-back follower wheel 39, a second ejection follower wheel 40, a second guide rod 41, a second spring 42, a second mounting base 43, and a fixed base 44. The fixed base 44 is fixedly connected to the frame 1, the second mounting base 43 is fixedly installed on the fixed base 44, the demolding ring plate 26 is fixedly connected to the second mounting base 43, the second guide rod 41 is fixed on the demolding push rod 25, the second guide rod 41 is slidably connected to the second pre-pressing platform 38, the second spring 42 is installed between the second pre-pressing platform 38 and the demolding push rod 25, the second ejection follower wheel 40 is rotatably installed on the demolding push rod 25, the second ejection follower wheel 40 is rollingly connected to the demolding guide surface 29, the second pull-back follower wheel 39 is rotatably installed on the second pre-pressing platform 38, and the second pull-back follower wheel 39 is rollingly connected to the second mounting base 43.

[0055] Specifically, when the rotating shaft 2 rotates, the second ejector follower wheel 40 rolls on the part of the demolding guide surface 29 with the same thickness, and will not push the demolding push rod 25 and the forming mold 23 to move axially. At this time, the push rod 14 pushes the can 7 on the star wheel 4 into the protective sleeve 22, and makes the neck of the can 7 contact the conical surface 28 of the forming mold 23 to perform necking forming on the can 7.

[0056] After the necking process, the second ejector follower wheel 40 rolls on the gradually thickening part of the demolding guide surface 29, which pushes the demolding push rod 25 and the forming mold 23 to move axially, causing the forming mold 23 to move out of the protective sleeve 22, thereby pushing the can 7 out of the protective sleeve 22. During this process, the first ejector follower wheel 32 contacts the gradually thinning part of the push guide surface 18, causing the push rod 14 to move away from the mold assembly 6, thus preventing the can 7 from being squeezed because the push rod 14 does not move when the demolding push rod 25 pushes out of the can 7.

[0057] In some embodiments, please refer to Figure 1 and Figure 6 As shown, a first partition 45 is fixed inside the vent pipe 3, which divides the vent pipe 3 into an adsorption channel 46 and a high-pressure channel 47. A second partition 48 is fixed inside the adsorption channel 46, which divides the adsorption channel 46 into a negative pressure channel 9 and an atmospheric channel 10. The high-pressure channel 47 is connected to a high-pressure air source, which can be an air compressor. The rotating shaft 2 has multiple high-pressure holes 50 radially opened, which are connected to the through holes 8. Each high-pressure hole 50 corresponds to a demolding push rod 25. The demolding push rod 25 is a hollow rod, which is connected to its corresponding high-pressure hole 50 through a connecting pipe 51. The high-pressure hole 50 can be connected to the high-pressure channel 47.

[0058] Specifically, the ventilation pipe 3 is divided into multiple independent channels by the first partition 45 and the second partition 48, realizing the integration of multiple functions such as negative pressure adsorption, atmospheric release and high pressure demolding.

[0059] The connection between the high-pressure channel 47 and the demolding push rod 25 allows the high-pressure gas generated by the high-pressure gas source to enter the demolding push rod 25 through the high-pressure channel 47, the high-pressure hole 50 and the connecting pipe 51 when the tank 7 is pushed out of the protective sleeve 22. The gas pressure is used to quickly separate the formed tank 7 from the conical surface 28 of the forming mold 23.

[0060] In some embodiments, please refer to Figure 1 , Figure 6 and Figure 7As shown, a negative pressure adsorption sleeve 52 and a high-pressure air blowing sleeve 53 are fixed on the vent pipe 3. Both the negative pressure adsorption sleeve 52 and the high-pressure air blowing sleeve 53 are rotatably and sealingly connected to the through hole 8. The rotating shaft 2 is provided with a negative pressure connection port 54, an atmospheric connection port 55 and an air blowing connection port 56. The negative pressure connection port 54 is connected to the negative pressure channel 9, the atmospheric connection port 55 is connected to the atmospheric channel 10, and the air blowing connection port 56 is connected to the high-pressure channel 47. The negative pressure adsorption sleeve 52 is provided with a negative pressure connection port 57 connected to the negative pressure connection port 54 and an atmospheric connection port 58 connected to the atmospheric connection port 55. The high-pressure air blowing sleeve 53 is provided with an air blowing connection port 59 connected to the air blowing connection port 56. The first negative pressure hole 11 can be rotated to the position connected to the negative pressure connection port 57 and the position connected to the atmospheric connection port 58. The high-pressure hole 50 can be rotated to the position connected to the air blowing port 59.

[0061] Specifically, the negative pressure adsorption sleeve 52 and the high pressure blowing sleeve 53 enable stable communication between the first negative pressure hole 11 and the high pressure hole 50 and the channels inside the ventilation pipe 3 during the rotation of the rotating shaft 2.

[0062] It should be noted that by designing different connection ports and connecting ports, it is ensured that the corresponding gas channels can be accurately connected at different stages of tank body 7 processing, such as adsorption, release, and demolding.

[0063] Furthermore, the rotating seal connection ensures the airtightness of the gas channel during rotation, preventing gas leakage and ensuring the normal operation of functions such as negative pressure adsorption, atmospheric release, and high-pressure demolding, thereby improving the stability and reliability of the device operation.

[0064] In some embodiments, please refer to Figure 1 As shown, a double-pass rotary joint 60 and a single-pass rotary joint 61 are also provided. The two channels of the double-pass rotary joint 60 are respectively connected to the negative pressure channel 9 and the atmospheric channel 10, and the single-pass rotary joint 61 is connected to the high pressure channel 47.

[0065] Specifically, the negative pressure channel 9 is connected to the negative pressure source through the double-port rotary joint 60, and the atmospheric channel 10 is connected to the clean atmosphere through the double-port rotary joint 60. The double-port rotary joint 60 and the single-port rotary joint 61 solve the problem of gas channel connection during the rotation of the shaft 2, and ensure the stable connection between the negative pressure source, the atmosphere and the high-pressure gas source and each channel in the ventilation pipe 3.

[0066] The double-pass rotary joint 60 enables independent connection between the negative pressure channel 9 and the atmospheric channel 10, while the single-pass rotary joint 61 enables connection between the high-pressure channel 47. This ensures that all gas channels remain unobstructed while the rotating shaft 2 continues to rotate, providing a stable gas supply for the adsorption, release, and demolding operations of the tank 7, and guaranteeing the continuous production of the device.

[0067] In some embodiments, please refer to Figure 1 As shown, the demolding push rod 25 has a second mounting groove 62, and the end of the second guide rod 41 away from the second pre-compression table 38 is fixedly installed in the second mounting groove 62.

[0068] Specifically, the distance between the second ejector follower wheel 40 and the second pull-back follower wheel 39 is small, making it difficult to meet the installation space requirements for the second spring 42. By providing the second mounting groove 62, the accommodating length of the second spring 42 can be increased, allowing the second spring 42 to have a longer length, which facilitates adaptation to the stroke of the demolding push rod 25 and meets the expansion and contraction requirements.

[0069] In some embodiments, please refer to Figure 2 As shown, the protective sleeve 22 is provided with a first shoulder 63, and the fixed sleeve 24 has an outwardly protruding ring part 64 at one end near the protective sleeve 22. The outer wall of the ring part 64 is provided with external threads, and an installation sleeve 66 is threadedly connected to the ring part 64. One end of the installation sleeve 66 has a pressing part 67, which presses the first shoulder 63 onto the ring part 64.

[0070] Specifically, the protective sleeve 22 and the fixed sleeve 24 are securely connected through the threaded connection between the mounting sleeve 66 and the fixed sleeve 24, and through the pressing action of the clamping part 67 on the first shoulder 63. This connection method facilitates the installation and removal of the protective sleeve 22, while ensuring that the protective sleeve 22 will not loosen during equipment operation, thus providing good protection for the molding die 23 and preventing external debris from entering and affecting the normal operation of the molding die 23.

[0071] In some embodiments, please refer to Figure 2 As shown, the demolding push rod 25 is provided with a second shoulder 49 and a third shoulder 65. The second shoulder 49 abuts against the forming mold 23. The inner wall of the forming mold 23 is provided with a boss 19. A nut 20 is threaded on the demolding push rod 25. A washer 21 is fitted on the demolding push rod 25. The nut 20 presses the washer 21 tightly onto the boss 19 and the third shoulder 65.

[0072] Specifically, the detachable and fixed connection between the molding die 23 and the demolding push rod 25 is achieved through the cooperation of the nut 20, the washer 21, the second shoulder 49, the third shoulder 65, and the boss 19.

[0073] It should be noted that this connection method makes the replacement of the molding mold 23 more convenient and quick. When it is necessary to process tanks 7 of different specifications, simply remove the nut 20 to replace the corresponding molding mold 23, which improves the versatility and flexibility of the equipment and meets diverse production needs.

[0074] As a collection of the above embodiments, please refer to Figure 1 and 2 As shown, the working process of the tank necking device provided in this embodiment is as follows:

[0075] 1. Initial state of the equipment: After the necking device of this tank is installed and debugged, the rotating shaft 2 is in a stationary state, the push rod 14 is located in the initial position away from the mold assembly 6 under the action of the first spring 34, the demolding push rod 25 makes the forming mold 23 located in the protective sleeve 22 under the action of the second spring 42, and the negative pressure adsorption sleeve 52 of the vent pipe 3 and the first negative pressure hole 11 are in the state of communicating with the negative pressure channel 9;

[0076] 2. Loading and adsorption of tank 7: Using existing feeding equipment, such as a feeding brick tower, the tank 7 to be processed is placed in the adsorption groove 12 of the star wheel 4 in sequence. The negative pressure source is started, and the negative pressure gas passes through the negative pressure channel 9, the negative pressure connection port 54, the negative pressure connection port 57, the first negative pressure hole 11, and the second negative pressure hole 13 to adsorb and fix the tank 7 at the bottom of the adsorption groove 12, ensuring that the tank 7 remains stable during subsequent processing, and that the tank 7 can move axially while maintaining negative pressure adsorption.

[0077] 3. Can body 7 pushing and necking forming: The rotating shaft 2 starts to rotate, and the first ejector follower wheel 32 on the pusher rod 14 contacts the gradually thickening part of the pusher guide surface 18 of the pusher ring plate 17. As the rotating shaft 2 rotates, the first ejector follower wheel 32 is subjected to the force of the pusher guide surface 18 and gradually moves towards the mold assembly 6. The pusher rod 14 overcomes the resistance of the first spring 34 and moves axially along the slide rail 16 towards the mold assembly 6. The extrusion pad 15 at the end of the pusher rod 14 pushes and absorbs... The can 7 attached to the star wheel 4 moves toward the protective sleeve 22; at this time, the second ejector follower wheel 40 on the demolding push rod 25 of the mold assembly 6 rolls on the demolding guide surface 29 of the demolding ring plate 26 with the same thickness, and will not push the demolding push rod 25 and the forming mold 23 to move. When the can 7 is pushed into the protective sleeve 22, the neck of the can 7 contacts the conical surface 28 of the forming mold 23. Under the continuous push of the push rod 14, the neck of the can 7 completes the necking forming under the action of the conical surface 28 of the forming mold 23.

[0078] 4. Demolding of Can 7: After the necking molding of Can 7 is completed, the second ejector follower wheel 40 rolls to the part of the demolding guide surface 29 where the thickness gradually increases. Under the action of this part of the surface, the demolding push rod 25 overcomes the resistance of the second spring 42 and drives the molding die 23 to move axially, causing the molding die 23 to move out of the protective sleeve 22 and push Can 7 out of the protective sleeve 22. At the same time, the first ejector follower wheel 32 contacts the part of the pusher guide surface 18 where the thickness gradually decreases. The force on the first ejector follower wheel 32 changes, causing the pusher push rod 14 to move away from the mold assembly 6, so as to avoid the pusher push rod 14 not moving when the demolding push rod 25 pushes out of Can 7, which would cause Can 7 to be squeezed. During this period, the rotating shaft 2 rotates to rotate the high pressure hole 50 to the position where it connects with the air inlet 59, the air outlet 56, and the high pressure channel 47. The high pressure gas source introduces high pressure gas into the demolding push rod 25 through the high pressure channel 47, the high pressure hole 50, and the connecting pipe 51. The high pressure gas acts between the tank body 7 and the cone surface 28, separating the tank body 7 from the forming mold 23 and completing the demolding operation. Subsequently, the first negative pressure hole 11 rotates to connect with the atmospheric inlet 58, and the atmospheric air enters the adsorption groove 12, releasing the adsorption on the tank body 7. At this time, the next existing technology conveying brick tower adsorbs and transfers the tank body 7 to the next flanging process equipment, completing a complete tank body 7 necking process.

[0079] 5. Reset: The first ejector follower wheel 32 rotates to contact the part with the same thickness on the ejector guide surface 18 and remains fixed in position with the star wheel 4. The second ejector follower wheel 40 rotates to contact the part with gradually decreasing thickness on the demolding guide surface 29 and gradually moves away from the star wheel 4. Then the second ejector follower wheel 40 rotates to contact the part with the same thickness on the demolding guide surface 29 and remains fixed in position with the star wheel 4. The ejector assembly 5 and the mold assembly 6 have both completed reset and rotated to the initial position to prepare for the necking process of the next can 7.

[0080] 6. Continuous processing cycle: The rotating shaft 2 rotates continuously, repeating the above-mentioned steps of feeding and adsorption of the tank 7, pushing and necking, demolding, etc., to realize the continuous automated necking processing of the tank 7; when processing tanks 7 of different specifications, the position of the pusher assembly 5 can be adjusted by adjusting the different connection positions of the internal thread hole 37 on the adjusting seat 36 and the first mounting seat 35, which can facilitate the necking processing of tanks 7 of the same diameter but different lengths; the extrusion pad 15 is detachably connected to the pusher rod 14 by bolts, which can be easily replaced; by replacing the appropriate mold assembly 6, the diverse necking processing needs of the tank 7 can be met.

[0081] 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.

[0082] Furthermore, 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 at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0083] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

Claims

1. A necking apparatus for a can body, characterized by, Includes frame, shaft, vent pipe, star wheel, pusher assembly, and mold assembly; The rotating shaft is rotatably mounted on the frame. The rotating shaft has a through hole at its center. The vent pipe is fixedly mounted on the frame and is coaxial with the rotating shaft. The vent pipe has independent negative pressure channels and atmospheric channels. The negative pressure channels are connected to a negative pressure source, and the atmospheric channels are connected to the atmosphere. The rotating shaft has multiple first negative pressure holes that are connected to the through hole in the radial direction. The first negative pressure holes can be connected to the negative pressure channels and the atmospheric channels. The star wheel is fixedly mounted on the rotating shaft. The outer cylindrical surface of the star wheel has multiple evenly distributed adsorption grooves for accommodating the tank. The bottom of the adsorption grooves has second negative pressure holes. The second negative pressure holes correspond one-to-one with the first negative pressure holes and are connected. The pusher assembly corresponds one-to-one with the adsorption groove. The pusher assembly includes a pusher rod, a pressing pad, a slide rail, and a pusher ring plate. The slide rail is fixedly mounted on the rotating shaft, and the pusher rod is fixedly mounted on the slider of the slide rail. The pressing pad is fixed to the end of the pusher rod facing the mold assembly. The pusher ring plate is fixedly connected to the frame and has a pusher guiding surface. When the rotating shaft rotates, the pusher rod can move axially under the action of the pusher guiding surface to move closer to or away from the mold assembly. The mold assembly corresponds one-to-one with the pusher assembly. The mold assembly includes a protective sleeve, a forming mold, a fixed sleeve, a demolding push rod, and a demolding ring plate. The fixed sleeve is fixedly connected to the rotating shaft, the demolding push rod is slidably connected to the fixed sleeve, the forming mold is fixedly connected to the demolding push rod, the protective sleeve is fixedly connected to the fixed sleeve, and the forming mold is slidably connected to the protective sleeve. The forming mold has a conical surface on the side facing the pusher assembly for forming the neck of the can. The demolding ring plate is fixedly connected to the frame and has a demolding guide surface. When the rotating shaft rotates, the push rod can move axially under the action of the demolding guide surface to move closer to or away from the pusher assembly.

2. The necking apparatus of claim 1, wherein, A first partition is fixed inside the vent pipe, which divides the vent pipe into an adsorption channel and a high-pressure channel. A second partition is fixed inside the adsorption channel, which divides the adsorption channel into a negative pressure channel and an atmospheric channel. The high-pressure channel is connected to a high-pressure gas source. The rotating shaft has multiple high-pressure holes that communicate with the through holes in a radial direction. Each high-pressure hole corresponds to a demolding push rod. The demolding push rod is a hollow rod and is connected to its corresponding high-pressure hole through a connecting pipe. The high-pressure holes can communicate with the high-pressure channel.

3. The necking apparatus of claim 2, wherein, The ventilation pipe is fixed with a negative pressure adsorption sleeve and a high pressure blowing sleeve. Both the negative pressure adsorption sleeve and the high pressure blowing sleeve are rotatably and sealingly connected to the through hole. The rotating shaft is provided with a negative pressure connection port, an atmospheric connection port and a blowing port. The negative pressure connection port is connected to the negative pressure channel, the atmospheric connection port is connected to the atmospheric channel, and the blowing port is connected to the high pressure channel. The negative pressure adsorption sleeve is provided with a negative pressure connection port connected to the negative pressure connection port and an atmospheric connection port connected to the atmospheric connection port. The high pressure blowing sleeve is provided with a blowing port connected to the blowing port. The first negative pressure hole can be rotated to the position connected to the negative pressure connection port and the position connected to the atmospheric connection port. The high pressure hole can be rotated to the position connected to the blowing port.

4. The necking apparatus of claim 3, wherein, It also includes a double-pass rotary joint and a single-pass rotary joint. The two channels of the double-pass rotary joint are respectively connected to the negative pressure channel and the atmospheric channel, and the single-pass rotary joint is connected to the high-pressure channel.

5. The necking apparatus of claim 1, wherein, The pusher assembly further includes a first pre-pressing platform, a first pull-back follower wheel, a first ejector follower wheel, a first guide rod, a first spring, a first mounting base, and an adjusting base. The adjusting base is fixedly connected to the frame. The adjusting base has multiple sets of internal threaded holes, each set of internal threaded holes corresponding to each of the first mounting bases. Each set of internal threaded holes includes multiple internal threaded holes arranged in a straight line along the axis of rotation. The first mounting base is connected to the adjusting base by bolts. The bolts can selectively be threaded to one of the internal threaded holes. The pusher ring plate is fixedly connected to the first mounting base. A first guide rod is fixed on the pusher rod. The first guide rod is slidably connected to the first pre-pressing platform. A first spring is installed between the first pre-pressing platform and the pusher rod. The first ejector follower wheel is rotatably mounted on the pusher rod and is rollingly connected to the pusher guide surface. The first pull-back follower wheel is rotatably mounted on the first pre-pressing platform and is rollingly connected to the first mounting base.

6. The necking apparatus of claim 4, wherein, The push rod is provided with a first mounting groove, and the end of the first guide rod away from the first pre-compression table is fixedly installed in the first mounting groove.

7. The necking apparatus of claim 1, wherein, The mold assembly further includes a second pre-pressing platform, a second pull-back follower wheel, a second ejection follower wheel, a second guide rod, a second spring, a second mounting base, and a fixed base. The fixed base is fixedly connected to the frame, the second mounting base is fixedly mounted on the fixed base, the demolding ring plate is fixedly connected to the second mounting base, the second guide rod is fixed on the demolding push rod, the second guide rod is slidably connected to the second pre-pressing platform, a second spring is installed between the second pre-pressing platform and the demolding push rod, the second ejection follower wheel is rotatably mounted on the demolding push rod, the second ejection follower wheel is rollingly connected to the demolding guide curved surface, the second pull-back follower wheel is rotatably mounted on the second pre-pressing platform, and the second pull-back follower wheel is rollingly connected to the second mounting base.

8. The necking apparatus of claim 7, wherein, The demolding push rod has a second mounting groove, and the end of the second guide rod away from the second pre-compression table is fixedly installed in the second mounting groove.

9. The necking apparatus of claim 1, wherein, The protective sleeve is provided with a first shoulder, and the fixed sleeve has an outwardly protruding ring part at one end near the protective sleeve. The outer wall of the ring part is provided with external threads, and an installation sleeve is threadedly connected to the ring part. One end of the installation sleeve has a clamping part, which clamps the first shoulder onto the ring part.

10. The necking apparatus of claim 1, wherein, The demolding push rod is provided with a second shoulder and a third shoulder. The second shoulder abuts against the forming mold. The inner wall of the forming mold is provided with a boss. A nut is threaded on the demolding push rod. A washer is fitted on the demolding push rod. The nut presses the washer tightly onto the boss and the third shoulder.

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