An inside flange forming device for a jacketed through hole

Abstract

The present application provides a kind of inside flanging forming device of jacket through hole, belong to pressure vessel processing technical field.It solves the problem of existing technology when processing jacket through hole inside flanging, processing is troublesome, the problem of insufficient forming quality.The inside flanging forming device of jacket through hole, including cylinder body, forming die head and vertically arranged pull rod, forming die head is conical frustum and has the guide hole one along its axis through, the large end of forming die head is downward and fixedly connected in the upper end of cylinder body, the lower end of pull rod is slidably connected in cylinder body and pull rod can be relatively cylinder body axial telescopic under the action of hydraulic drive, pull rod is up and out of forming die head through the guide hole one, the upper end of pull rod can be detachably sleeved with the push seat that can be synchronous with pull rod and move down, the bottom of this push seat has the push part of circular tube shape and is concentrically arranged with forming die head.The present application makes jacket through hole can be smoothly and smoothly completed flanging forming, effectively guarantees the forming precision and forming quality of inside flanging.

Description

Technical Field

[0001] This invention belongs to the field of pressure vessel processing technology and relates to an inner flange forming device for jacket through holes. Background Technology

[0002] As a core pressure vessel in industries such as chemical, pharmaceutical, and food processing, the jacket structure of a reaction vessel is a key component for achieving heating, cooling, or heat preservation of the medium. The jacket is typically an annular cavity that covers the outside of the reaction vessel body, forming a closed heat exchange space through welding with the vessel body.

[0003] In practical applications of reactor jackets, to meet process requirements such as nozzle installation or media flow guidance structures, it is necessary to further process the pre-set circular through-hole of the jacket to form an inward-flared structure. However, due to the large size and heavy weight of the jacket itself, forming the inward-flared structure is quite difficult. Currently, the industry generally places the reactor jacket with the opening facing upwards, uses hoisting equipment to lift the stamping forming device, and then temporarily fixes the stamping forming device to the outer wall of the jacket by spot welding. Subsequently, the area around the opening is directly heated with a flame until the material reaches the plastic deformation temperature, and then the stamping forming device stamps it to fold the hole wall inward to complete the processing. In actual processing, this method has the following shortcomings:

[0004] 1. Flame heating can easily lead to uneven heating in the jacket opening area, resulting in localized excessively high or low temperatures. This causes significant differences in the plasticity of the material in different parts, which can lead to irregular flanging shapes, poor surface precision, and even localized collapse and deformation of the jacket after stamping, greatly affecting the forming quality. Furthermore, high-temperature heating can cause oxidation and blackening of the stainless steel surface, altering the material's metallographic structure and affecting the product's service life.

[0005] 2. Because this forming method requires spot welding the stamping equipment to the outer wall of the top of the jacket, heating it before stamping, and then disassembling the equipment and grinding the weld points after forming, the process is lengthy and inefficient, thus causing processing problems. Summary of the Invention

[0006] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing an inner flanging forming device for jacket through holes. The technical problem solved by this invention is that existing technologies for processing inner flanging of jacket through holes are cumbersome and have insufficient forming quality.

[0007] The objective of this invention can be achieved through the following technical solution: An internal flanging forming device for a jacketed through hole, comprising a cylinder body, characterized in that the internal flanging forming device further comprises a forming die head and a vertically arranged pull rod, the forming die head being frustoconical and having a guide hole through it along its axis, the large end of the forming die head facing downward and fixedly connected to the upper end of the cylinder body, the lower end of the pull rod being slidably connected to the cylinder body and the pull rod being axially extendable relative to the cylinder body under hydraulic drive, the pull rod passing upward through the guide hole through the forming die head, and the upper end of the pull rod being detachably sleeved with a push seat that can move downward synchronously with the pull rod, the bottom of the push seat having a cylindrical push part concentrically arranged with the forming die head.

[0008] During processing, the cylinder body is placed on the ground, with the tie rod kept vertical. Then, using hoisting equipment, the reactor jacket is lifted, with the pre-set opening facing downwards and aligned with the forming die head. The jacket is then slowly lowered. At this point, because the upper end of the tie rod is not yet engaged with the pusher seat, the upper end of the tie rod can smoothly enter the jacket's inner cavity through the through-hole on the jacket during lowering. As the jacket continues to descend, its outer wall gradually abuts against the frustoconical outer wall of the forming die head, completing the jacket positioning.

[0009] After the jacket is positioned, the worker enters the jacket and attaches the pusher seat to the upper end of the pull rod. Under the action of hydraulic driving force, the pull rod moves downward along the axis, causing the pusher seat to move downward synchronously. When the lower end face of the pusher seat is in contact with the inner circumferential wall of the jacket, pressure is continued to be applied downward. The pusher seat can stably drive the entire jacket to move downward. During this process, because the pusher seat is a cylindrical pusher seat and is concentric with the forming die head, and the forming die head is a frustoconical shape with the small end facing upward, the edge of the jacket through hole can undergo plastic deformation along the conical surface of the forming die head, gradually folding inward to form a regular conical inner flange structure, until the pusher seat moves to the end of its stroke, completing the inner flange forming.

[0010] This device relies on hydraulic drive combined with the weight of the jacket to complete the plastic flanging deformation of the through hole, effectively reducing the external force load required for the plastic deformation of the material. This allows the jacket through hole to complete the flanging formation smoothly and steadily, effectively ensuring the forming accuracy and quality of the inner flanging. Furthermore, the inner flanging process of this device eliminates the steps of flame heating and spot welding to fix the stamping equipment in existing technologies, thus simplifying the operation process and reducing processing difficulty. At the same time, it avoids problems such as local collapse and deformation of the jacket caused by uneven heating during flame heating in existing technologies, thereby further ensuring the forming quality of the inner flanging.

[0011] In the aforementioned internal flange forming device for the jacket through hole, the pusher seat further includes a horizontally arranged lower pressure plate located on the upper side of the pusher part. The pusher part is fixedly connected to the lower pressure plate and concentrically arranged with the pull rod. The lower pressure plate has a second guide hole in the middle that slides and guides the pull rod. The pull rod slides and guides the first guide hole on the forming die head. The sliding guide engagement between the pull rod and the first guide hole on the forming die head allows the forming die head to perform both forming and guiding functions. It ensures the precise axial movement of the pull rod through the first guide hole and guarantees the tapered surface accuracy of the internal flange through the tapered surface constraint. The lower pressure plate is fixedly connected to the pusher part, and the second guide hole in the middle of the lower pressure plate slides and engages with the pull rod, which restricts the relative position of the pusher seat and the pull rod, ensuring the concentricity of the pusher part and the pull rod. This allows the downward force of the pull rod to be applied smoothly and evenly to the inner wall of the jacket through the pusher part, avoiding uneven force loading, thereby effectively improving the forming accuracy and quality of the internal flange.

[0012] In the aforementioned internal flange forming device for the jacket through hole, the push seat further includes an upper pressure plate, two transverse support plates, and two longitudinal support plates. The upper pressure plate is horizontally arranged, and the upper end of the pull rod passes upward through the upper pressure plate and is threaded with a locking nut. The two transverse support plates and the two longitudinal support plates are located between the upper pressure plate and the lower pressure plate. The two transverse support plates are parallel to each other and are located on both sides of the pull rod. The two longitudinal support plates are perpendicular to the transverse support plates and are located on both sides of the pull rod. The upper end faces of the two transverse support plates and the two longitudinal support plates are on the same horizontal plane, and the lower end faces are also on the same horizontal plane.

[0013] The upper surfaces of the transverse support plate and the longitudinal support plate are on the same horizontal plane, allowing them to fit against the horizontal upper pressure plate. Similarly, the lower surfaces of the transverse support plate and the longitudinal support plate are on the same horizontal plane, allowing them to fit against the horizontal lower pressure plate. This ensures that when the pull rod moves downward, the axial pressure applied by the locking nut can be transmitted evenly and stably to the lower pressure plate through the upper pressure plate, the transverse support plate, and the longitudinal support plate in sequence. This avoids force skewing, localized weak support, and localized deformation of the lower pressure plate due to small-area stress, thereby ensuring the working stability and processing quality of the inner flange forming device.

[0014] In the aforementioned internal flange forming device for the jacket through hole, the upper edges of both ends of the transverse support plate are respectively provided with clearance notches 1 penetrating the two side walls of the transverse support plate, and the lower edges of both ends of the longitudinal support plate are respectively provided with clearance notches 2 penetrating the two side walls of the longitudinal support plate. The transverse support plate and the longitudinal support plate are interlocked and inserted with each other through clearance notches 1 and clearance notches 2. This design can achieve precise alignment and combination of the transverse support plate and the longitudinal support plate, quickly forming an overall cross support structure, ensuring the support rigidity and downward pressure stability of the push seat, and improving the forming accuracy and processing quality of the internal flange of the jacket through hole. Moreover, due to the use of a split assembly design, the individual components are lightweight and can be transported separately inside the jacket and temporarily assembled on-site, adapting to the construction conditions of the limited working space inside the jacket, greatly improving the convenience of processing.

[0015] In the aforementioned internal flange forming device for the jacket through hole, the opening width of the first clearance notch along the length of the transverse support plate is adapted to the horizontal thickness of the longitudinal support plate, and the opening width of the second clearance notch along the length of the longitudinal support plate is adapted to the horizontal thickness of the transverse support plate. This structure allows the transverse support plate and the longitudinal support plate to mutually limit and constrain each other, preventing structural loosening when the push seat is under pressure, thereby further improving the forming accuracy and processing quality of the internal flange of the jacket through hole.

[0016] In the aforementioned internal flange forming device for the jacket through hole, the lower pressure plate is circular, and its outer diameter is larger than that of the pushing part. This structure ensures that the lower pressure plate stably presses down on the pushing part, improving the forming accuracy and processing quality of the internal flange of the jacket through hole.

[0017] In the aforementioned internal flanging forming device for the jacketed through hole, an annular support boss protrudes circumferentially from the outer peripheral wall of the cylinder. This internal flanging forming device also includes several vertically arranged support rods, spaced apart circumferentially along the support boss. Each support rod has a vertically arranged adjusting screw fixedly connected to its upper end. The adjusting screw passes upward through the support boss and is threadedly connected to an adjusting nut. Each support rod provides stable multi-point support to the cylinder. By turning the adjusting nut on the adjusting screw, the height of each support point can be adjusted, thereby leveling the entire device and ensuring the vertical orientation of the pull rod, thus guaranteeing the accuracy of the internal flanging forming.

[0018] In the aforementioned internal flange forming device for the jacketed through hole, the cylinder has a piston chamber, and the pull rod includes a piston rod section whose lower end is slidably connected to the piston chamber, a transition rod section coaxially inserted into the upper end of the piston rod section and having a convex cross-section, and an extension rod section whose lower end is sleeved and fixed to the upper end of the transition rod section. The outer diameter of the extension rod section is smaller than that of the piston rod section, and the extension rod section passes through the first guide hole upwards out of the forming die. The piston rod section and the extension rod section are connected by the convex cross-section transition rod section, so that the outer diameter of the pull rod decreases gradually from bottom to top. This structure allows the extension rod section with a smaller outer diameter at the upper end of the pull rod to smoothly fit into the first guide hole of the forming die, facilitating connection with the locking nut; on the other hand, the gradual decrease in the outer diameter of the pull rod from bottom to top reduces stress concentration at the diameter change position of the pull rod, avoids deformation of the pull rod during reciprocating hydraulic push-pull force, and further improves the working stability of the device.

[0019] In the aforementioned internal flange forming device for the jacket through-hole, the cylinder body includes a piston cylinder and a cylindrical upper cylinder sleeve. The upper cylinder sleeve is vertically arranged and its lower end is fixedly connected to the upper end of the piston cylinder. The forming die head is fixedly connected to the upper end of the upper cylinder sleeve. The upper cylinder sleeve serves to elevate the forming die head, making it easier for operators to visually observe the lowering process of the jacket and accurately control the alignment of the jacket opening with the forming die head, thus improving processing convenience. Moreover, the vertically arranged cylindrical upper cylinder sleeve provides safety protection for the internal tie rod movement area and prevents external dust and debris from entering the cylinder body, ensuring smooth and stable operation of the forming device.

[0020] In the aforementioned internal flange forming device for the jacket through hole, the support rod is tubular and has a horizontally positioned connecting plate at its upper end. The adjusting screw passes through the connecting plate and is fixedly connected to it. The tubular shape of the support rod reduces the overall weight while ensuring its support strength, facilitating the transport and on-site installation of the device. The fixed connection between the connecting plate and the adjusting screw ensures the stability of the adjusting screw's position, thereby ensuring the overall stability of the device after leveling.

[0021] Compared with existing technologies, the internal flanging forming device for the through hole of this jacket has the following advantages:

[0022] 1. This device relies on hydraulic driving force in conjunction with the weight of the jacket to complete the plastic flanging deformation of the through hole, effectively reducing the external force load required for the plastic deformation of the material, enabling the through hole of the jacket to complete the flanging formation smoothly and efficiently, and effectively ensuring the forming accuracy and quality of the inner flanging.

[0023] 2. The internal flanging process of this device eliminates the steps of flame heating and spot welding to fix the stamping equipment in the existing technology, thus simplifying the operation process and reducing the processing difficulty. At the same time, it can avoid the problems of local collapse and deformation of the jacket caused by uneven heating during flame heating in the existing technology, thereby further ensuring the forming quality of the internal flanging. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of the internal flanging forming device.

[0025] Figure 2 This is an exploded view of the pusher seat.

[0026] Figure 3 This is a schematic diagram of the operating status of the internal flanging forming device. Figure 1 .

[0027] Figure 4 yes Figure 3 Enlarged view of point A in the middle.

[0028] Figure 5 This is a schematic diagram of the operating status of the internal flanging forming device. Figure 2 .

[0029] Figure 6 This is a schematic diagram of the operating status of the internal flanging forming device. Figure 3 .

[0030] In the diagram, 1. Cylinder body; 11. Piston cylinder; 111. Support boss; 112. Piston chamber; 12. Upper cylinder liner; 2. Forming die head; 21. Guide hole one; 3. Tie rod; 31. Piston rod section; 32. Transition rod section; 33. Extension rod section; 4. Support assembly; 41. Support rod; 42. Adjusting screw; 43. Adjusting nut; 44. Connecting plate; 5. Push seat; 51. Push part; 52. Lower pressure plate; 521. Guide hole two; 53. Upper pressure plate; 54. Longitudinal support plate; 541. Avoidance notch two; 55. Transverse support plate; 551. Avoidance notch one; 56. Locking nut; 6. Jacket. Detailed Implementation

[0031] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0032] like Figures 1 to 3As shown, the inner flange forming device for the through hole of this jacket includes a cylinder 1, a forming die 2, a vertically arranged pull rod 3, and a support assembly 4 supporting the cylinder 1. The forming die 2 is frustoconical and has a guide hole 21 that runs through its axis. The pull rod 3 is slidably guided and engaged with the guide hole 21 on the forming die 2. The large end of the forming die 2 faces downward and is fixedly connected to the upper end of the cylinder 1. The lower end of the pull rod 3 is slidably connected inside the cylinder 1, and the pull rod 3 can extend and retract axially relative to the cylinder 1 under hydraulic drive. The pull rod 3 passes upward through the guide hole 21 and exits the forming die 2. The upper end of the pull rod 3 is detachably sleeved with a pusher seat 5 that can move downward synchronously with the pull rod 3. The bottom of the pusher seat 5 has a cylindrical pusher part 51 that is concentrically arranged with the forming die 2, and the lower end face of the pusher part 51 can fit against the inner peripheral wall of the jacket 6.

[0033] like Figure 2 and Figure 4 As shown, the pusher seat 5 also includes a horizontally arranged lower pressure plate 52, a horizontally arranged upper pressure plate 53, two longitudinal support plates 54, and two transverse support plates 55 located on the upper side of the pusher part 51. The pusher part 51 is fixedly connected to the lower pressure plate 52 and is concentrically arranged with the pull rod 3. The lower pressure plate 52 has a guide hole 521 in the middle for sliding guidance with the pull rod 3. The lower pressure plate 52 is circular, and the outer diameter of the lower pressure plate 52 is larger than the outer diameter of the pusher part 51. The upper end of the pull rod 3 passes through the upper pressure plate 53 and is threaded with a locking nut 56. The two transverse support plates 55 and the two longitudinal support plates 54 are located between the upper pressure plate 53 and the lower pressure plate 52. The two transverse support plates 55 are parallel to each other and are located on both sides of the pull rod 3. The two longitudinal support plates 54 are perpendicular to the transverse support plates 55 and are located on both sides of the pull rod 3. The upper end faces of the two transverse support plates 55 and the two longitudinal support plates 54 are on the same horizontal plane, and the lower end faces are also on the same horizontal plane.

[0034] like Figure 2 As shown, the upper edges of both ends of the transverse support plate 55 are respectively provided with clearance notches 1 551 penetrating the two side walls of the transverse support plate 55, and the lower edges of both ends of the longitudinal support plate 54 are respectively provided with clearance notches 2 541 penetrating the two side walls of the longitudinal support plate 54. The transverse support plate 55 and the longitudinal support plate 54 are interlocked and inserted with each other through clearance notches 1 551 and clearance notches 2 541. The opening width of clearance notch 1 551 along the length direction of the transverse support plate 55 is adapted to the horizontal thickness of the longitudinal support plate 54, and the opening width of clearance notch 2 541 along the length direction of the longitudinal support plate 54 is adapted to the horizontal thickness of the transverse support plate 55.

[0035] like Figure 1 As shown, an annular support boss 111 protrudes circumferentially from the outer peripheral wall of the cylinder body 1. The support assembly 4 includes several vertically arranged support rods 41, which are spaced apart circumferentially along the support boss 111. Figure 5As shown, each support rod 41 has a vertically arranged adjusting screw 42 fixedly connected to its upper end. The adjusting screw 42 passes upward through the support boss 111 and is threadedly connected to an adjusting nut 43. Specifically, the support rod 41 is tubular and has a horizontally arranged connecting plate 44 at its upper end. The adjusting screw 42 passes through the connecting plate 44 and is fixedly connected to the connecting plate 44.

[0036] In another case, the support assembly can also be a steel frame structure, with the cylinder 1 welded onto the steel frame.

[0037] like Figure 3 As shown, the cylinder body 1 has a piston chamber 112, and the tie rod 3 includes a piston rod section 31 with its lower end slidably connected in the piston chamber 112, a transition rod section 32 coaxially inserted into the upper end of the piston rod section 31 and having a convex cross section, and an extension rod section 33 with its lower end sleeved and fixed to the upper end of the transition rod section 32. The outer diameter of the extension rod section 33 is smaller than the outer diameter of the piston rod section 31, and the extension rod section 33 passes upward through the guide hole 21 to the forming die head 2.

[0038] like Figure 3 As shown, the cylinder body 1 includes a piston cylinder 11 and a cylindrical upper cylinder sleeve 12. The upper cylinder sleeve 12 is vertically arranged and its lower end is fixedly connected to the upper end of the piston cylinder 11. The forming die head 2 is fixedly connected to the upper end of the upper cylinder sleeve 12.

[0039] The following is a brief introduction to the processing method of this forming device for forming the inner flange of the jacket through hole:

[0040] First, the cylinder 1 is placed stably on the ground using the support assembly 4. The height of each support point can be adjusted by turning the adjusting nut 43 on the adjusting screw 42 to ensure that the pull rod 3 is set vertically.

[0041] Subsequently, the reactor jacket 6 is lifted using hoisting equipment, with the pre-set opening of the jacket 6 facing downwards and aligned with the forming die head 2, and the jacket 6 is slowly lowered. At this time, the upper end of the pull rod 3 has not yet been engaged with the push seat 5, and the upper end of the pull rod 3 can smoothly enter the inner cavity of the jacket 6 through the through hole during the lowering process. As the jacket 6 continues to be lowered, the outer wall of the jacket 6 will gradually abut against the frustoconical outer wall of the forming die head 2, completing the positioning of the jacket 6.

[0042] After the clamping sleeve 6 is positioned, the worker enters the inside of the clamping sleeve 6 and attaches the pusher seat 5 to the upper end of the pull rod 3, as follows. Figure 3 and Figure 6As shown. Then, under the action of hydraulic driving force, the pull rod 3 moves downward axially, causing the pusher seat 5 to move downward synchronously. When the lower end face of the pusher part 51 of the pusher seat 5 is in contact with the inner peripheral wall of the sleeve 6, pressure continues to be applied downwards. The pusher seat 5 can stably drive the entire sleeve 6 downwards. During this process, because the pusher part 51 of the pusher seat 5 is cylindrical and concentric with the pull rod 3, and the forming die head 2 is frustoconical with its small end facing upwards, the edge of the sleeve through hole can undergo plastic deformation along the conical surface of the forming die head 2, gradually folding inwards to form a regular conical inner flange structure, until the pusher seat 5 moves down to the end of its stroke, completing the inner flange forming, as shown. Figure 5 As shown.

[0043] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

[0044] Although this document frequently uses terms such as 1. cylinder body; 11. piston cylinder; 111. support boss; 112. piston chamber; 12. upper cylinder liner; 2. forming die head; 21. guide hole one; 3. tie rod; 31. piston rod section; 32. transition rod section; 33. extension rod section; 4. support assembly; 41. support rod; 42. adjusting screw; 43. adjusting nut; 44. connecting plate; 5. push seat; 51. push part; 52. lower pressure plate; 521. guide hole two; 53. upper pressure plate; 54. longitudinal support plate; 541. clearance notch two; 55. transverse support plate; 551. clearance notch one; 56. locking nut; 6. jacket, etc., the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would contradict the spirit of the invention.

Claims

1. An internal flanging forming device for a jacketed through hole, comprising a cylinder (1), characterized in that, The internal flanging forming device also includes a forming die head (2) and a vertically arranged pull rod (3). The forming die head (2) is truncated cone-shaped and has a guide hole (21) that runs through its axis. The large end of the forming die head (2) faces downward and is fixedly connected to the upper end of the cylinder (1). The lower end of the pull rod (3) is slidably connected inside the cylinder (1) and the pull rod (3) can extend and retract axially relative to the cylinder (1) under hydraulic drive. The pull rod (3) passes through the guide hole (21) upward through the forming die head (2). The upper end of the pull rod (3) is detachably sleeved with a push seat (5) that can move down synchronously with the pull rod (3). The bottom of the push seat (5) has a push part (51) that is cylindrical and concentrically arranged with the forming die head (2).

2. The inner flange forming device for the jacket through hole according to claim 1, characterized in that, The pusher seat (5) also includes a horizontally arranged lower pressure plate (52) located on the upper side of the pusher part (51). The pusher part (51) is fixedly connected to the lower pressure plate (52) and is concentrically arranged with the pull rod (3). The middle part of the lower pressure plate (52) has a guide hole two (521) that slides and guides the pull rod (3). The pull rod (3) slides and guides the guide hole one (21) on the forming die head (2).

3. The inner flange forming device for the jacket through hole according to claim 2, characterized in that, The pusher seat (5) also includes an upper pressure plate (53), two transverse support plates (55) and two longitudinal support plates (54). The upper pressure plate (53) is horizontally arranged. The upper end of the pull rod (3) passes through the upper pressure plate (53) and is threaded with a locking nut (56). The two transverse support plates (55) and the two longitudinal support plates (54) are located between the upper pressure plate (53) and the lower pressure plate (52). The two transverse support plates (55) are parallel to each other and are located on both sides of the pull rod (3). The two longitudinal support plates (54) are perpendicular to the transverse support plates (55) and are located on both sides of the pull rod (3). The upper surfaces of the two transverse support plates (55) and the two longitudinal support plates (54) are on the same horizontal plane, and the lower surfaces are also on the same horizontal plane.

4. The inner flange forming device for the jacket through hole according to claim 3, characterized in that, The upper edges of both ends of the transverse support plate (55) are respectively provided with a first clearance notch (551) that penetrates the two side walls of the transverse support plate (55), and the lower edges of both ends of the longitudinal support plate (54) are respectively provided with a second clearance notch (541) that penetrates the two side walls of the longitudinal support plate (54). The transverse support plate (55) and the longitudinal support plate (54) are interlocked and spliced ​​together by the first clearance notch (551) and the second clearance notch (541).

5. The inner flange forming device for the jacket through hole according to claim 4, characterized in that, The opening width of the first clearance notch (551) along the length of the transverse support plate (55) is adapted to the horizontal thickness of the longitudinal support plate (54), and the opening width of the second clearance notch (541) along the length of the longitudinal support plate (54) is adapted to the horizontal thickness of the transverse support plate (55).

6. The inner flange forming device for the jacket through hole according to any one of claims 2 to 5, characterized in that, The lower pressure plate (52) is circular, and the outer diameter of the lower pressure plate (52) is larger than the outer diameter of the push part (51).

7. The inner flange forming device for the jacket through hole according to any one of claims 1 to 5, characterized in that, The outer peripheral wall of the cylinder (1) has a ring-shaped support boss (111) protruding in the circumferential direction. The inner flange forming device also includes a number of vertically arranged support rods (41). Each support rod (41) is spaced apart in the circumferential direction along the support boss (111). The upper end of each support rod (41) is fixedly connected to a vertically arranged adjusting screw (42). The adjusting screw (42) passes upward through the support boss (111) and is threadedly connected to an adjusting nut (43).

8. The inner flange forming device for the jacket through hole according to claim 7, characterized in that, The cylinder (1) has a piston chamber (112), and the pull rod (3) includes a piston rod section (31) with its lower end slidably connected in the piston chamber (112), a transition rod section (32) coaxially inserted into the upper end of the piston rod section (31) and having a convex cross section, and an extension rod section (33) with its lower end sleeved and fixed to the upper end of the transition rod section (32). The outer diameter of the extension rod section (33) is smaller than the outer diameter of the piston rod section (31), and the extension rod section (33) passes upward through the guide hole (21) to the forming die head (2).

9. The inner flange forming device for the jacket through hole according to any one of claims 1 to 5, characterized in that, The cylinder body (1) includes a piston cylinder (11) and a cylindrical upper cylinder sleeve (12). The upper cylinder sleeve (12) is vertically arranged and its lower end is fixedly connected to the upper end of the piston cylinder (11). The forming die head (2) is fixedly connected to the upper end of the upper cylinder sleeve (12).

10. The inner flange forming device for the jacket through hole according to claim 7, characterized in that, The support rod (41) is tubular and has a horizontally arranged connecting plate (44) at its upper end. The adjusting screw (42) passes through the connecting plate (44) and is fixedly connected to the connecting plate (44).

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