Three-drum forming mechanical drum capsule pressing ring and capsule

Abstract

According to the three-drum forming mechanical drum capsule pressing ring and the capsule, the height difference between the upper portion of the capsule and the joint of the outer surface of the middle drum outer ring and the joint of the upper portion of the middle drum inner ring is reduced or eliminated, under the condition that the capsule is not stretched, the connecting section of the capsule smoothly surrounds the outer side end of the pressing ring, and the problem that rolling at the position is not compact in the forming and pressing process cannot be caused.

Description

Technical Field

[0001] This invention relates to a mechanical drum used in a three-drum forming machine, and more particularly to a capsule pressing ring and capsule of a three-drum forming mechanical drum. Background Technology

[0002] like Figure 3 and Figure 4 As shown, the forming drum of the three-drum forming machine has a capsule on its fan-shaped block. One end of the capsule is located in the groove of the fan-shaped block, and the other end (called the capsule head end) is fixedly set in the groove of the cylinder wall 5 of the fan-shaped block and pressed by the capsule pressure ring. The capsule pressure ring is fixed to the cylinder wall of the fan-shaped block by bolts. However, this structure results in a 15mm gap between the capsule and the joint 10 of the inner ring 12 / outer ring 13 of the forming drum at the connection point. Figure 3 As shown, inadequate rolling during the molding and pressing process will result in indentations from the rollers and air bubbles on each tire blank. This can easily lead to bead bubbles and insufficient glue in the finished product. Figure 1 and Figure 2 As shown, the tires do not meet the requirements of the molding process and the appearance quality. To achieve the required appearance, workers must repair the tires multiple times, which greatly reduces production efficiency. Summary of the Invention

[0003] To solve the above problems, the present invention provides a three-drum forming machine with a capsule pressing ring and a capsule, which reduces or eliminates the height difference at the connection between the upper part of the capsule and the outer surface of the outer and inner rings of the middle drum. When the capsule is not stretched, the capsule connecting section smoothly wraps around the outer end of the pressing ring, so that the problem of incomplete rolling at this point will not occur during the forming and pressing process.

[0004] The technical solution of the present invention is as follows: a mechanical drum capsule pressure ring for a three-drum forming machine, wherein the capsule pressure ring is provided with bolt holes corresponding to the bolt connection holes of the sector block cylinder wall, and a pressure ring groove is provided on the side of the capsule pressure ring facing the middle drum. The size of the pressure ring groove is adapted to the first end of the capsule. In the axial direction, after the forming machine is installed, the distance between the pressure ring groove and the corresponding position of the axial end face of the middle drum is 0-2mm. In the radial direction, the pressure ring groove is located outside the bolt holes, and the outer end of the capsule pressure ring is located outside the sector block cylinder wall and supports the capsule.

[0005] A protrusion is provided on the axial end face of the middle drum, and a pressure ring groove is opened on the capsule pressure ring at the position corresponding to the protrusion. In the axial direction, after the molding machine is installed, the distance between the protrusion and the side walls on both sides of the pressure ring groove is 0-2mm. In the central drum axis, the distance between the junction of the capsule and the outer surface of the inner / outer ring of the central drum and the outer end of the capsule pressure ring is the thickness of the capsule passing through this point ± 1 mm; The height difference between the outer end of the capsule pressure ring and the outer surface of the inner / outer ring of the middle drum is 3.5-9mm. When the fan-shaped block is in a radially contracted state, the thickness of the capsule portion wrapped around the outer end of the pressure ring is 3.5-4.5mm.

[0006] The outer side of the outer wall of the groove of the pressure ring is hollowed out; the outer end face of the capsule pressure ring is the outer end face, and the two sides connected to the outer end face are respectively surface I and surface II. The corners a3 and a4 formed by the outer end face and surface I and surface II are rounded; the two sides connected to the side I of the outer wall of the groove near the middle drum are respectively surface III and surface IV. The corners a5 and a2 formed by the side I of the outer wall of the groove near the middle drum and surface III and surface IV are rounded. The outer side of the groove near the outer end is surface Ⅲ. Surface Ⅲ is connected to surface Ⅰ, and the connection point a1 is transitioned by a rounded corner.

[0007] The outer side wall of the pressure ring groove near the middle drum has a missing piece at the outer end; The outer end of the capsule pressure ring extends away from the central drum, reaching the outer side of the outer end of the sector block cylinder wall, and the axial length of the outer end face of the capsule pressure ring is greater than or equal to 15mm.

[0008] A capsule for a three-drum forming machine includes a capsule head end, a capsule connecting section, and a capsule tail end connected in sequence. The capsule head end is located in a pressure ring groove, the size of which is adapted to the capsule head end. The capsule tail end surrounds the outside of a fan-shaped block, and the inner surface of the capsule tail end is adapted to the shape of the fan-shaped block groove. From the capsule head end to the capsule tail end, the capsule connecting section passes around the outer wall of the groove and the outer end face of the pressure ring in sequence, and then connects to the capsule tail end located outside the fan-shaped block.

[0009] The capsule connecting section includes connecting section I, connecting section II, connecting section III, and connecting section IV connected in sequence; connecting section I is connected to the end of the capsule head near the middle drum side II, so that in the axial direction, the side of connecting section I near the middle drum side III is further away from the end section than the side of the capsule head near the middle drum side II; A protrusion is provided on the axial end face of the middle drum. The protrusion rests on the side II of the capsule head near the middle drum. The end face of the protrusion near the outer side rests on the end face of the connecting section I near the inner side, pressing the capsule head tightly.

[0010] The connection between connecting section I and the beginning of the capsule is rounded, and the edges on the inner side of the end face of connecting section I are also rounded. Connecting section I is attached to the side I of the outer wall of the pressure ring near the middle drum, and connecting section III is wrapped around the outer end face of the pressure ring—that is, the outer end face of the pressure ring; Connecting segment II is an inclined segment, and it is connected to connecting segment I and connecting segment III by rounded corners; connecting segment IV is an inclined segment, and it is connected to connecting segment III by rounded corners.

[0011] A groove I is provided on the outer side of the capsule's distal segment. Groove I includes an outwardly inclined segment I, an arc-shaped segment I, a horizontal segment I, an outwardly inclined segment II, an arc-shaped segment II, and an outwardly inclined segment III connected in sequence. The horizontal segment I and the outwardly inclined segment II form the bottom of groove I. The outwardly inclined segment I and the outwardly inclined segment III are the two end sidewalls of groove I, respectively. The outwardly inclined segment I and the horizontal segment I are connected by the arc-shaped segment I, and the outwardly inclined segment II and the outwardly inclined segment III are connected by the arc-shaped segment II. The outer surface of connecting segment IV is connected to the outwardly inclined segment I, and both are located on the same inclined plane.

[0012] One end of the outwardly inclined section III is also connected to the horizontal section II, which is located on the outside of the side wall of the fan-shaped block groove.

[0013] The angle b1 between the horizontal segment I and the outwardly inclined segment I is 115-125°; The angle b2 between the outwardly inclined segment II and the horizontal segment I is 4°-6°; The angle b3 between the outward-sloping segment III and the horizontal segment I is 115-125°.

[0014] The thickness of the capsule head is 8-12mm; the thickness of the capsule connecting section is 3-5mm; the thickness of horizontal section II is 2.5-4mm; the thickness of horizontal section I is 15-17mm; and the maximum thickness of the outwardly inclined section II is 19-25mm.

[0015] The beneficial effects of this invention are that the three-drum forming mechanical drum capsule pressing ring provided in this application reduces or eliminates the height difference at the junction of the upper part of the capsule with the inner ring of the middle drum and / or the outer surface of the outer ring.

[0016] The three-drum forming machine capsule provided in this application ensures that when the sector block is in a radially contracted state, i.e. when the capsule is not stretched, the capsule connecting section smoothly wraps around the outer end of the pressure ring, so that the problem of incomplete rolling at this point will not occur during the forming and pressing process. Attached Figure Description

[0017] Figure 1 These are photographs of embryonic pathological features with existing structures.

[0018] Figure 2 These are photos of tire rubber defects corresponding to the location of the embryonic lesions.

[0019] Figure 3 This is a schematic diagram of the connection between the capsule and the middle drum of an existing three-drum forming machine.

[0020] Figure 4 This is a schematic diagram of the structure of the central drum.

[0021] Figure 5This is a schematic diagram of the connection between the capsule and the middle drum of the three-drum forming machine of the present invention.

[0022] Figure 6 This is a schematic diagram of the capsule compression ring structure of the three-drum forming machine of the present invention.

[0023] Figure 7 This is a schematic diagram of the structure of the capsule of the three-drum forming machine of the present invention. Detailed Implementation

[0024] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and specific embodiments. It should be understood that the preferred embodiments described herein are only for illustration and explanation of the present invention and should not be construed as limiting the scope of protection of the present invention. Those skilled in the art can make some non-essential improvements and adjustments based on the following content of the present invention. In this invention, unless otherwise expressly specified and limited, the technical terms used in this application should have the ordinary meaning understood by those skilled in the art.

[0025] like Figures 4-6 As shown, a mechanical drum capsule pressure ring 6 of a three-drum forming machine has bolt holes 61 corresponding to the bolt connection holes of the sector block cylinder wall 5. The capsule pressure ring 6 has a pressure ring groove 62 on the side facing the middle drum. The size of the pressure ring groove 62 is adapted to the capsule head end 70, and the distance between the pressure ring groove 62 and the corresponding position of the axial end face 2 of the middle drum is 0-2mm, so that the axial end face 2 of the middle drum can press the capsule head end tightly. In the radial direction, the pressure ring groove 62 is located outside the bolt holes 61, and the outer end 60 of the capsule pressure ring is located outside the sector block cylinder wall 5 and supports the capsule, thus serving as a capsule support part.

[0026] A protrusion 11 is provided on the axial end face 2 of the middle drum. The protrusion 11 is a connecting platform with the side drum. A connecting hole is provided on the connecting platform. A pressure ring groove 62 is opened on the capsule pressure ring 6 at the position corresponding to the protrusion 11. In the axial direction, after the molding machine is installed, the distance between the protrusion 11 and the side walls on both sides of the pressure ring groove 62 is 0-2mm, so that the capsule head end 70 in the pressure ring groove 62 can be pressed tightly.

[0027] In this application, the capsule pressure ring 6 is redesigned, and the height difference between the upper part of the capsule and the outer surface 10 of the inner ring 12 / outer ring 13 of the middle drum is reduced or eliminated by "the outer end 60 of the capsule pressure ring is located outside the sector block cylinder wall 5 and supports the capsule". The inner ring and outer ring of the middle drum are the inner sleeve and outer sleeve of the middle drum.

[0028] The capsule compression ring provided in this application eliminates or reduces the height difference at the junction of the capsule with the inner ring of the middle drum and the outer surface 1 of the outer ring, and makes the capsule head end firmly connected.

[0029] In addition, the height difference between the outer end 60 of the capsule pressure ring and the outer surface 1 of the inner ring / outer ring of the middle drum is 3.5-9mm, preferably 3.5-4.6mm. When the fan-shaped block is in a radially contracted state, the thickness of the capsule portion wrapped around the outer end 60 of the pressure ring is 3.5-4.5mm, so that the height difference at the junction 10 between the capsule and the inner ring / outer surface 1 of the middle drum is eliminated or reduced.

[0030] Additionally, in the axial direction of the middle drum, the distance between the junction 10 of the capsule and the outer surface 1 of the inner / outer ring of the middle drum and the outer end 60 of the capsule pressure ring is the thickness of the capsule passing through this point ± 1 mm. This eliminates or reduces the gap between the capsule and the junction 10 of the inner / outer ring of the middle drum in the axial direction.

[0031] Therefore, this application reduces or eliminates the discontinuity, including height difference and gap, between the capsule and the inner ring / outer surface 10 of the middle drum by redesigning the capsule pressure ring 6 and by having the outer end 60 of the capsule pressure ring located outside the sector block cylinder wall 5 and supporting the capsule.

[0032] Axially, the junction 10 between the capsule and the inner / outer ring surface 1 of the middle drum is closer to the fan-shaped block than the protrusion 11 of the middle drum. The outer side of the groove outer wall 63 of the pressure ring groove is hollowed out to facilitate the capsule passing between the junction 10 between the capsule and the inner / outer ring surface 1 of the middle drum and the capsule pressure ring.

[0033] The outer end 60 of the capsule pressure ring is the outer end face 601. The two sides connected to the outer end face 601 are face I 602 and face II 603, respectively. The angles a3 and a4 formed by the outer end face 601 with face I 602 and face II 603 are rounded. The two sides connected to the side I 631 of the outer wall 63 of the groove near the central drum are face III 632 and face IV 633, respectively. The angles a5 and a2 formed by the side I 631 of the outer wall 63 of the groove near the central drum with face III 632 and face IV 633 are rounded. The rounding of angles a3, a4, a5, and a2 facilitates close contact with the capsule and reduces wear on the capsule.

[0034] The outer side wall 63 of the groove, near the side 631 of the central drum, has a notch at the end near the outer side. The advantage of this design is that it reduces weight and reduces the labor intensity of changing the capsule each time.

[0035] The outer wall 63 of the groove, near the outer end 60, is surface III 632. Surface III 632 connects with surface I 602, and the connection point a1 is transitioned by a rounded corner. The advantage of this design is that it prevents scratches on the capsule contact area, especially on the capsule teeth, when changing capsules.

[0036] The outer end 60 of the capsule pressure ring extends away from the central drum, reaching the outer side of the outer end 50 of the sector block cylinder wall. The axial length of the outer end face 601 of the capsule pressure ring is greater than or equal to 15mm, reducing problems caused by insufficient rolling during the molding and pressing process.

[0037] In addition, the structure of the capsule pressure ring is compatible with that of the sector block cylinder wall 5 at the connection point.

[0038] This application also provides a capsule structure, as detailed below: like Figure 4 , Figure 5 and Figure 7 As shown, a capsule 7 for a three-drum forming machine includes a capsule head end 70, a capsule connecting section 71, and a capsule tail end 72 connected in sequence. The capsule head end 70 is located in a pressure ring groove 62, the size of which is adapted to the capsule head end 70. The capsule tail end 72 surrounds the outside of a fan-shaped block, and the inner surface of the capsule tail end 72 is adapted to the shape of the groove in the fan-shaped block. From the capsule head end 70 to the capsule tail end 72, the capsule connecting section 71 passes through the outer wall 63 of the groove and the outer end 60 of the pressure ring in sequence and then connects to the capsule tail end 72 located outside the fan-shaped block.

[0039] The purpose of this capsule design is to ensure that when the sector block is in a radially contracted state, that is, when the capsule is not stretched, the connecting section smoothly wraps around the outer end 60 of the pressure ring, so that the rolling is not loose during the molding and pressing process, thus preventing problems.

[0040] The capsule tip 70 is thickened, with a thickness of 8-12mm. The capsule connecting section 71 has a thickness of 3-5mm.

[0041] The capsule connecting section 71 includes connecting section I 711, connecting section II 712, connecting section III 713, and connecting section IV 714 connected in sequence; connecting section I 711 is connected to the end of the capsule head end 70 near the middle drum side II 701, so that in the axial direction, the side of connecting section I 711 near the middle drum side III 715 is further away from the end section 72 than the side of the capsule head end 70 near the middle drum side II 701.

[0042] A protrusion 11 is provided on the axial end face 2 of the middle drum. The protrusion 11 presses against the side II 701 of the capsule head 70 near the middle drum. The end face of the protrusion near the outer side presses against the end face 716 of the connecting section I near the inner side, thereby pressing the capsule head 70 and preventing the capsule head 70 from coming out of the pressure ring groove when the fan-shaped block expands radially outward.

[0043] Since the bottom and opening of the compression ring groove 62 are the same size on the cross-section of the capsule compression ring, and since the compression ring groove 62 is not a structure with a large bottom and a small opening, when the capsule compression ring is far away from one end, the capsule head 70 in the compression ring groove can be easily removed, thus facilitating capsule replacement.

[0044] The connection between connecting segment I and the capsule head 70 is rounded, and the edges on the inner end face 716 of connecting segment I are also rounded.

[0045] Connecting section I is attached to the side 631 of the outer wall 63 of the pressure ring near the central drum, and connecting section III surrounds the outer end 60 face of the pressure ring—that is, the outer end face 601 of the pressure ring. Connecting section II is an inclined section, and is connected to connecting section I and connecting section III by rounded corners. Connecting section IV is also an inclined section, and is also connected to connecting section III by rounded corners. The rounded corners are designed to reduce stress concentration in the capsule.

[0046] The purpose of this capsule design is to ensure that when the fan-shaped block is in a radially contracted state, that is, when the capsule is not stretched, the connecting section III smoothly wraps around the outer end 60 of the pressure ring, so that the rolling is not loose during the molding and pressing process, thus preventing problems.

[0047] The outer surface of the capsule end segment 72 is provided with a groove I. Groove I includes an outwardly inclined segment I 78, an arc-shaped segment I 73, a horizontal segment I 74, an outwardly inclined segment II 75, an arc-shaped segment II 76, and an outwardly inclined segment III 79 connected in sequence. The horizontal segment I 74 and the outwardly inclined segment II 75 form the bottom of groove I. The outwardly inclined segment I 78 and the outwardly inclined segment III 79 are the two end sidewalls of groove I, respectively. The outwardly inclined segment I 78 and the horizontal segment I 74 are connected by the arc-shaped segment I 73, and the outwardly inclined segment II 75 and the outwardly inclined segment III 79 are connected by the arc-shaped segment II 76.

[0048] This application modifies the tilt angles of various points in groove I at the end of the capsule, making the bead positioning relatively accurate.

[0049] The outer surface of connecting segment IV is connected to the outwardly inclined segment I78, and both are located on the same inclined plane.

[0050] The capsule end section 72 is mainly adapted to the structure of tubed tires, especially 20-inch tubed tires.

[0051] One end of the outwardly inclined section III79 is also connected to a horizontal section II77, which is located on the outer side wall of the fan-shaped block groove. The addition of the horizontal section II77 matches the shape of the seamless fan-shaped block of the side drum, preventing the edge of the fan-shaped block from damaging the tire bead.

[0052] The design features an outward-sloping section II75, which ensures relatively accurate positioning of the tire bead / tire bead.

[0053] The angle b1 between the horizontal segment I and the outwardly inclined segment I78 is 115-125°, preferably 120°, to match the angle of that part of the tire bead.

[0054] The angle b2 between the outward tilting segment II75 and the horizontal segment I74 is 4°-6°, which matches the bead opening of the tire embryo, making the tire bead / tire bead positioning phase more accurate.

[0055] The angle b3 between the outwardly inclined segment III79 and the horizontal segment I74 is 115-125°, preferably 120°. This angle makes the bead positioning relatively accurate, and the inclination allows the bead to be automatically positioned.

[0056] The thickness of horizontal section II77 is 2.5-4mm, the thickness of horizontal section I74 is 15-17mm, and the maximum thickness of the outwardly inclined section II75 is 19-25mm, preferably 22mm. This design ensures better fit with the tire bead and effectively compacts the tire bead.

[0057] This application changes the tilt angle of each part of the 72 groove I at the end, so that the tire bead positioning is relatively accurate. The thickness of the bladder in the groove I part is increased, so that the fit with the corresponding bead part of the tire is better.

[0058] This application designs the capsule pressing ring and capsule, changing the contact connection between the capsule head end, connecting section and capsule pressing ring, so that the inner ring and outer ring of the middle drum can smoothly transition with the capsule. In addition, by redesigning the structure of the capsule groove I in the sector block, the problems of reverse wrapping wheel indentation, bead bubbles and tire bead bubbles and missing glue in the tire blank are solved. This greatly improves the appearance of the tire blank and solves the problems of bead bubbles and missing glue in the finished product, meeting the process requirements, improving the process quality of the product, reducing the waste of production costs, and improving production efficiency.

[0059] The above descriptions are merely preferred embodiments of the present invention, not all embodiments. The scope of protection of the present invention is not limited thereto. The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments have been described. However, as long as the combination of these technical features does not contradict each other, it should be considered to be within the scope of this specification. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention. It should be noted that for those skilled in the art and any person skilled in the art, any equivalent substitutions or changes made to the technical solutions and inventive concepts of the present invention, as well as any changes and improvements made, without departing from the overall concept and spirit of the present invention, should also be considered within the scope of protection of the present invention.

Claims

1. A mechanical drum capsule pressing ring for a three-drum forming machine, characterized in that: The capsule pressure ring (6) is provided with bolt holes (61) corresponding to the bolt connection holes of the sector block cylinder wall (5). The capsule pressure ring (6) is provided with a pressure ring groove (62) on the side facing the middle drum. The size of the pressure ring groove (62) is adapted to the capsule head end (70). In the axial direction, after the molding machine is installed, the distance between the pressure ring groove (62) and the corresponding position of the axial end face (2) of the middle drum is 0-2mm. In the radial direction, the pressure ring groove (62) is located outside the bolt holes (61), and the outer end (60) of the capsule pressure ring is located outside the sector block cylinder wall (5) and supports the capsule.

2. The mechanical drum capsule pressing ring of the three-drum forming machine according to claim 1, characterized in that: A protrusion (11) is provided on the axial end face (2) of the middle drum, and a pressure ring groove (62) is opened on the capsule pressure ring (6) at the position corresponding to the protrusion (11). In the axial direction, after the molding machine is installed, the distance between the protrusion (11) and the side walls on both sides of the pressure ring groove (62) is 0-2mm. In the axial direction of the middle drum, the distance between the junction (10) of the capsule and the outer surface of the inner / outer ring of the middle drum and the outer end (60) of the capsule pressure ring is the thickness of the capsule passing through this point ± 1 mm; The height difference between the outer end (60) of the capsule pressure ring and the outer surface (1) of the inner / outer ring of the middle drum is 3.5-9mm. When the fan-shaped block is in a radially contracted state, the thickness of the capsule portion wrapped around the outer end (60) of the pressure ring is 3.5-4.5mm.

3. The mechanical drum capsule pressing ring of the three-drum forming machine according to claim 1, characterized in that: The outer side of the outer wall (63) of the groove of the pressure ring (62) is hollowed out; the outer end (60) of the capsule pressure ring is the outer end face (601), and the two sides connected to the outer end face (601) are respectively face I (602) and face II (603). The corners a3 and a4 formed by the outer end face (601) and face I (602) and face II (603) are rounded; the two sides connected to the side I (631) of the outer wall (63) of the groove near the middle drum are respectively face III (632) and face IV (633). The corners a5 and a2 formed by the side I (631) of the outer wall (63) of the groove near the middle drum and face III (632) and face IV (633) are rounded. The outer wall of the groove (63) near the outer end (60) is surface III (632), which is connected to surface I (602). The connection point a1 is transitioned by rounding.

4. The mechanical drum capsule pressing ring of the three-drum forming machine according to claim 1, characterized in that: The outer side wall (63) of the groove (62) of the pressure ring is notched at the end near the outer side of the side (631) of the middle drum; The outer end (60) of the capsule pressure ring extends away from the middle drum and extends to the outer side of the outer end (50) of the sector block cylinder wall. The axial length of the outer end face (601) of the capsule pressure ring is greater than or equal to 15 mm.

5. A capsule for a three-drum forming machine's mechanical drum, characterized in that: The capsule includes a capsule head end (70), a capsule connecting section (71), and a capsule tail end (72) connected in sequence. The capsule head end (70) is located in the pressure ring groove (62), and the size of the pressure ring groove (62) is adapted to the capsule head end (70). The capsule tail end (72) surrounds the outside of the fan-shaped block, and the inner side of the capsule tail end (72) is adapted to the shape of the fan-shaped block groove. From the capsule head end (70) to the capsule tail end (72), the capsule connecting section (71) passes around the outer wall (63) of the groove and the outer end (60) of the pressure ring in sequence and then connects to the capsule tail end (72) located outside the fan-shaped block.

6. The capsule of the mechanical drum of the three-drum forming machine according to claim 5, characterized in that: The capsule connecting section (71) includes connecting section I (711), connecting section II (712), connecting section III (713), and connecting section IV (714) connected in sequence; connecting section I (711) is connected to the end of the capsule head end (70) near the side II (701) of the middle drum, so that in the axial direction, the side III (715) of connecting section I (711) near the middle drum is further away from the end section (72) than the side II (701) of the capsule head end (70) near the middle drum. A protrusion (11) is provided on the axial end face (2) of the middle drum. The protrusion (11) rests on the side II (701) of the capsule head end (70) near the middle drum. The end face of the protrusion near the outer side rests on the end face (716) of the connecting section I near the inner side, pressing the capsule head end (70).

7. The capsule of the mechanical drum of the three-drum forming machine according to claim 6, characterized in that: The connection between connecting segment I and the capsule head (70) is rounded, and the corners on the inner end face (716) of connecting segment I are also rounded. Connecting section I (711) is attached to the side I (631) of the outer wall (63) of the pressure ring near the middle drum, and connecting section III (713) surrounds the outer end (60) face of the pressure ring—that is, the outer end face (601) of the pressure ring; Connecting segment II (712) is an inclined segment, and is connected to connecting segment I (711) and connecting segment III (713) respectively by rounded corners; connecting segment IV (714) is an inclined segment, and is connected to connecting segment III (713) by rounded corners.

8. The capsule of the mechanical drum of the three-drum forming machine according to claim 7, characterized in that: The outer side of the capsule end section (72) is provided with a groove I. The groove I includes an outwardly inclined section I (78), an arc-shaped section I (73), a horizontal section I (74), an outwardly inclined section II (75), an arc-shaped section II (76), and an outwardly inclined section III (79) connected in sequence. The horizontal section I (74) and the outwardly inclined section II (75) form the bottom of the groove I. The outwardly inclined section I (78) and the outwardly inclined section III (79) are the two sidewalls of the groove I, respectively. The outwardly inclined section I (78) and the horizontal section I (74) are connected by the arc-shaped section I (73). The outwardly inclined section II (75) and the outwardly inclined section III (79) are connected by the arc-shaped section II (76). The outer surface of connecting segment IV (714) is connected to the outwardly inclined segment I (78), and both are located on the same inclined plane.

9. The capsule of the mechanical drum of the three-drum forming machine according to claim 8, characterized in that: One end of the outwardly inclined section III (79) is also connected to the horizontal section II (77), which is located on the outside of the side wall of the fan-shaped block groove. The angle b1 between the horizontal segment I and the outwardly inclined segment I (78) is 115-125°; The angle b2 between the outwardly inclined segment II (75) and the horizontal segment I (74) is 4°-6°; The angle b3 between the outward tilting segment III (79) and the horizontal segment I (74) is 115-125°.

10. The capsule of the mechanical drum of the three-drum forming machine according to claim 8, characterized in that: The thickness of the capsule head (70) is 8-12 mm; the thickness of the capsule connecting section (71) is 3-5 mm; the thickness of the horizontal section II (77) is 2.5-4 mm; the thickness of the horizontal section I (74) is 15-17 mm; and the maximum thickness of the outwardly inclined section II (75) is 19-25 mm.

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