Water heater shell hemming one-time forming die

Abstract

The invention relates to the technical field of water heater manufacturing dies, and discloses a water heater shell hemming one-time forming die which is characterized in that a rotary table driven by a motor to rotate is arranged at the upper end of a workbench, a tensioning mechanism used for tensioning and fixing a water heater shell is arranged on the rotary table, and when the water heater shell downwards sleeves the outer side of the rotary table, the water heater shell is wound on the rotary table. The water heater outer shell drives the tensioning mechanism to be tensioned on the inner wall of the water heater outer shell; the supporting mechanism is used for supporting the lower end of the water heater outer shell. When the outer side of the rotary table is downwards sleeved with a water heater outer shell, the water heater outer shell drives a tensioning mechanism to be tensioned on the inner wall of the water heater outer shell, in this way, the water heater outer shell can be rapidly fixed, and the water heater outer shell is effectively prevented from inclining; the quality of subsequent hemming operation can be guaranteed; two sets of driving mechanisms do not need to be adopted to move the hemming head assembly up and down and left and right in sequence, and rapid hemming operation of the lower end of the outer shell of the water heater can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of water heater manufacturing moulds, in particular to a one-step forming mould for curling an outer shell of a water heater. Background Art

[0002] In order to meet certain aesthetic and safety requirements during the production of water heaters, the shell of the water heater needs to be curled. After the curling operation, the gap between the shell and the internal components can be effectively reduced, and the overall sealing of the water heater can be improved. This is crucial for preventing water leakage, heat preservation, and ensuring the normal operation of the internal components of the water heater. The shell of the water heater needs to be fixed before the curling operation. Fixing from the outside can easily cause the shell of the water heater to deform, or cause trouble in the fixing operation, and the shell of the water heater is skewed, which is not conducive to ensuring the quality of the subsequent curling operation; during the curling operation, the shell of the water heater rotates, and the curling head assembly gradually contacts the bottom of the water heater shell, so that the bottom of the water heater shell forms a curling. The curling head assembly needs to be driven by multiple sets of driving mechanisms separately, so that the curling head assembly can gradually contact the bottom of the water heater shell, which has low production efficiency. For this reason, we have introduced a one-time molding mold for curling the shell of the water heater. Summary of the invention

[0003] The object of the present invention is to provide a one-step molding die for curling the shell of a water heater to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions: a one-step forming die for curling the shell of a water heater, comprising a workbench, a turntable driven to rotate by a motor is provided at the upper end of the workbench, and a tensioning mechanism for tensioning and fixing the shell of the water heater is also provided on the turntable, when the shell of the water heater is downwardly sleeved on the outer side of the turntable, the shell of the water heater drives the tensioning mechanism to be tensioned on the inner wall of the shell of the water heater;

[0005] The upper end of the workbench is also provided with support mechanisms which are evenly spaced and distributed on the side of the turntable, and the support mechanisms are used to support the lower end of the outer shell of the water heater;

[0006] The upper end of the workbench is also provided with a curling mechanism, which includes a vertical shell fixed to the upper end of the workbench, an electric telescopic rod arranged on the top of the vertical shell, and a curling head assembly extending out of the vertical shell;

[0007] The electric telescopic rod drives the curling head assembly to move upward and contact the lower end of the water heater outer shell through the connecting mechanism, while the curling head assembly is gradually pushed toward the inner side of the lower end of the water heater outer shell. When the turntable drives the water heater outer shell to rotate, the curling head assembly realizes the curling operation on the lower end of the water heater outer shell.

[0008] Preferably, a vertical hole and a receiving hole at the bottom of the vertical hole are provided in the middle of the turntable, and a plurality of groups of slots distributed at equal intervals are provided on the upper side of the turntable;

[0009] The inner side of the slot extends to the vertical hole and the receiving hole;

[0010] The tensioning mechanism comprises a truncated cone seat located in the receiving hole, a vertical rod in the middle of the upper end of the truncated cone seat, a rubber seat connected to the top of the vertical rod after extending out of the vertical hole, and a tensioning plate slidably connected in the slot;

[0011] The round platform seat is arranged in a shape of being wide at the top and narrow at the bottom, and a triangular inclined plate is connected to the lower inner part of the tensioning plate.

[0012] Preferably, a mounting groove for mounting the first spring is provided in the center of the bottom of the accommodating hole, and the top of the first spring is connected to the middle of the lower end of the truncated pedestal seat.

[0013] Preferably, the inner bottom of the tensioning plate is connected to a limiting plate, the inner side of the slotted bottom is provided with a limiting groove for inserting the limiting plate, and a second spring is connected between the outer side wall of the limiting plate and the side wall of the limiting groove.

[0014] Preferably, the diameter of the top of the rubber seat gradually decreases, and the outer diameter of the lower part of the rubber seat is equal to the inner diameter of the outer shell of the water heater.

[0015] Preferably, the support mechanism comprises a support shell fixed to the upper end of the workbench and a support plate extending through a vertical groove inside the support shell;

[0016] The support plate is supported at the lower end of the outer shell of the water heater, and a vertical light rod penetrating the support plate is provided inside the vertical groove, and a third spring located at the bottom of the support plate is sleeved on the vertical light rod.

[0017] Preferably, the curling head assembly includes a truncated cone-shaped curling head, a limiting plate connected to the end of the truncated cone-shaped curling head, and a connecting rod fixed to the middle of the end of the limiting plate, and the diameter of the limiting plate is larger than the diameter of the end of the truncated cone-shaped curling head.

[0018] Preferably, the connecting mechanism comprises a transverse connecting tube located in a cavity inside the vertical housing and a fourth spring arranged in the transverse connecting tube, and the piston rod at the output end of the bottom of the electric telescopic rod extends into the cavity and is connected to the middle of the top of the transverse connecting tube;

[0019] A piston disk is provided on the connecting rod and is slidably connected to the inside of the transverse connecting tube. The fourth spring is sleeved on the connecting rod. Under the elastic force of the fourth spring on the piston disk, the end of the connecting rod passes through the transverse connecting tube and is tightly attached to the triangular slope on the vertical inner wall of the cavity.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: when the outer shell of the water heater is downwardly sleeved on the outer side of the turntable, the outer shell of the water heater drives the tensioning mechanism to be tensioned on the inner wall of the outer shell of the water heater, so that the outer shell of the water heater can be quickly fixed, and the tensioning is performed from the inside of the outer shell of the water heater, which is beneficial to prevent the outer shell of the water heater from being fixed and deformed, and the fixing is effective to prevent the outer shell of the water heater from being skewed, which is beneficial to ensure the quality of subsequent curling operations; the upper end of the workbench is also provided with a supporting mechanism distributed at equal intervals on the side of the turntable, and the supporting mechanism is used to support the lower end of the outer shell of the water heater, which is beneficial to ensure that the outer shell of the water heater is in a vertical state and prevent the outer shell of the water heater from tilting; the electric telescopic rod drives the curling head assembly to move up and contact the lower end of the outer shell of the water heater through the connecting mechanism, and at the same time, the curling head assembly is gradually pushed toward the inner side of the lower end of the outer shell of the water heater, and when the turntable drives the outer shell of the water heater to rotate, the curling head assembly realizes the curling operation of the lower end of the outer shell of the water heater, and there is no need to use two sets of driving mechanisms to successively move the curling head assembly up and down and left and right, so that the rapid curling operation of the lower end of the outer shell of the water heater can be realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the exploded structure of the water heater outer shell and the tensioning mechanism assembled in the present invention;

[0022] Figure 2 It is a schematic diagram of the exploded structure of the tensioning mechanism of the present invention;

[0023] Figure 3 For the present invention Figure 2 Schematic diagram of the cross-sectional structure at AA in the middle;

[0024] Figure 4 It is a schematic diagram of a three-dimensional structure in which a tensioning plate, a triangular inclined plate, a limiting plate and a second spring are connected in the present invention;

[0025] Figure 5 It is a three-dimensional structural schematic diagram of the crimping mechanism of the present invention;

[0026] Figure 6 It is a cross-sectional structural schematic diagram of the crimping mechanism of the present invention;

[0027] Figure 7 It is a schematic diagram of the overall three-dimensional structure of the present invention when performing a curling operation;

[0028] Figure 8 It is a cross-sectional structural schematic diagram of the turntable, the tensioning mechanism and the supporting mechanism of the present invention;

[0029] Fig. 9 For the present invention Figure 7 Schematic diagram of the cross-sectional structure at the middle BB;

[0030] Fig.10It is a schematic cross-sectional structural diagram of the curling mechanism and the outer shell of the water heater during the curling operation of the present invention.

[0031] In the figure: 1. workbench; 2. turntable; 3. rubber seat; 4. motor shaft; 5. bracket shell; 6. water heater outer shell; 7. crimping mechanism; 71. vertical shell; 72. electric telescopic rod; 73. connecting rod; 74. limit plate; 75. truncated cone shaped crimping head; 76. triangular slope; 77. transverse connecting cylinder; 78. piston plate; 79. fourth spring; 80. piston rod; 81. cavity; 8. support plate; 9. first spring; 10. vertical rod; 11. tensioning plate; 12. slot; 13. vertical hole; 14. truncated cone seat; 15. accommodating hole; 16. limit groove; 17. mounting groove; 18. triangular inclined plate; 19. limit plate; 20. second spring; 21. third spring; 22. vertical light rod; 23. motor; 24. vertical groove. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Example:

[0034] See also Figure 1-10 , the present invention provides a technical solution:

[0035] A one-step molding die for curling the shell of a water heater comprises a workbench 1, a turntable 2 driven to rotate by a motor 23 is arranged at the upper end of the workbench 1, the motor 23 is installed at the bottom of the workbench 1, and a motor shaft 4 at the output end of the top of the motor 23 passes through the workbench 1 and is connected to the middle part of the lower end of the turntable 2. The motor 23 is controlled by a PLC controller, so that the motor 23 can adjust the rotation speed of the turntable 2.

[0036] The turntable 2 is also provided with a tensioning mechanism for tensioning and fixing the outer shell 6 of the water heater; Figure 3 As shown, the middle of the turntable 2 is provided with a vertical hole 13 and a receiving hole 15 located at the bottom of the vertical hole 13, and the upper side of the turntable 2 is provided with a plurality of groups of slots 12 distributed at equal intervals; the inner side of the slot 12 extends to the vertical hole 13 and the receiving hole 15; Figure 2As shown, the tensioning mechanism includes a truncated cone seat 14 located in the accommodating hole 15, a vertical rod 10 in the middle of the upper end of the truncated cone seat 14, a rubber seat 3 connected to the top of the vertical rod 10 after extending out of the vertical hole 13, and a tensioning plate 11 slidingly connected in the slot 12; the diameter of the top of the rubber seat 3 gradually decreases, and such an arrangement facilitates the accurate downward sleeve of the water heater outer shell 6 on the outside of the rubber seat 3; and the outer diameter of the lower part of the rubber seat 3 is equal to the inner diameter of the water heater outer shell 6. Such an arrangement makes the outer wall of the lower part of the rubber seat 3 close to the inner wall of the water heater outer shell 6 when the water heater outer shell 6 is downwardly sleeved on the outside of the rubber seat 3, so that there is friction between the rubber seat 3 and the water heater outer shell 6, so that when the water heater outer shell 6 is pushed downward, the vertical rod 10 and the truncated cone seat 14 can also be driven by the rubber seat 3 to move downward as a whole.

[0037] The truncated pedestal 14 is arranged in a shape of being wide at the top and narrow at the bottom. When the truncated pedestal 14 moves downward, the truncated pedestal 14 can be pressed against the triangular inclined plate 18, thereby pushing the tensioning plate 11 to move along the slot 12 until the tensioning plate 11 extends out of the slot 12 and is closely attached to the inner wall of the outer shell 6 of the water heater, thereby achieving tensioning and fixing of the outer shell 6 of the water heater by the tensioning plate 11; Figure 4 As shown, a triangular inclined plate 18 is connected to the lower inner part of the tensioning plate 11, and a limiting plate 19 is connected to the inner bottom of the tensioning plate 11; a limiting groove 16 for inserting the limiting plate 19 is provided on the inner side of the bottom of the slot 12, and a second spring 20 is connected between the outer wall of the limiting plate 19 and the side wall of the limiting groove 16.

[0038] With such an arrangement, when the tensioning plate 11 extends out of the slot 12 and is pressed against the inner wall of the water heater outer shell 6, the limit plate 19 also slides along the limit slot 16, so that the second spring 20 is in a compressed state. Subsequently, the water heater outer shell 6 is lifted upward, driving the rubber seat 3, the vertical rod 10 and the truncated pedestal seat 14 to move upward as a whole. When the truncated pedestal seat 14 no longer abuts against the triangular inclined plate 18, the elastic force of the second spring 20 on the limit plate 19 causes the tensioning plate 11 to move inward along the slot 12, and the tensioning plate 11 is retracted to the slot 12 to achieve the reset of the tensioning plate 11.

[0039] like Figure 8 and 9As shown, a mounting groove 17 for mounting the first spring 9 is provided in the center of the bottom of the receiving hole 15, and the top of the first spring 9 is connected to the middle of the lower end of the truncated pedestal seat 14. Through the provision of the first spring 9, after the rubber seat 3, the vertical rod 10 and the truncated pedestal seat 14 move downward as a whole, the first spring 9 is in a compressed state, and when the outer shell 6 of the water heater is lifted upward, the friction between the outer shell 6 of the water heater and the rubber seat 3, and the elastic force of the first spring 9 on the truncated pedestal seat 14 can ensure that the rubber seat 3, the vertical rod 10 and the truncated pedestal seat 14 are driven to move upward and reset as a whole; when the outer shell 6 of the water heater is downwardly sleeved on the outside of the turntable 2, the outer shell 6 of the water heater drives the tensioning mechanism to be tensioned on the inner wall of the outer shell 6 of the water heater; the upper end of the workbench 1 is also provided with The supporting mechanism is used to support the lower end of the water heater outer shell 6; the supporting mechanism includes a bracket shell 5 fixed to the upper end of the workbench 1 and a supporting plate 8 extending through the vertical groove 24 inside the bracket shell 5; the supporting plate 8 is supported on the lower end of the water heater outer shell 6; with such an arrangement, after the water heater outer shell 6 is sleeved on the outside of the rubber seat 3 and the water heater outer shell 6 is continuously pushed downward so that the bottom of the water heater outer shell 6 is supported on the upper end of the supporting plate 8, the supporting plate 8 can play a role of balancing and supporting the water heater outer shell 6, ensuring that the water heater outer shell 6 is in a vertical state and the water heater outer shell 6 will not be skewed.

[0040] A vertical polished rod 22 penetrating the support plate 8 is also provided inside the vertical groove 24, and a third spring 21 located at the bottom of the support plate 8 is sleeved on the vertical polished rod 22. With such a configuration, after the bottom of the water heater outer shell 6 is supported on the upper end of the support plate 8, the support plate 8 will remain in a horizontal state and move downward along the vertical polished rod 22. At this time, the third spring 21 is gradually in a compressed state, achieving a buffering effect, and preventing the water heater outer shell 6 from causing an impact on the support plate 8 after being pushed downward;

[0041] The upper end of the workbench 1 is also provided with a curling mechanism 7, which includes a vertical housing 71 fixed to the upper end of the workbench 1, an electric telescopic rod 72 arranged on the top of the vertical housing 71, and a curling head assembly extending out of the vertical housing 71; the electric telescopic rod 72 is controlled by a PLC controller;

[0042] The electric telescopic rod 72 drives the curling head assembly to move upward and contact the lower end of the water heater outer shell 6 through the connecting mechanism, while the curling head assembly gradually advances toward the inner side of the lower end of the water heater outer shell 6. When the turntable 2 drives the water heater outer shell 6 to rotate, the curling head assembly realizes the curling operation on the lower end of the water heater outer shell 6.

[0043] The crimping head assembly includes a truncated cone-shaped crimping head 75, a limiting plate 74 connected to the end of the truncated cone-shaped crimping head 75, and a connecting rod 73 fixed to the middle of the end of the limiting plate 74;

[0044] like Fig.10 As shown, the diameter of the limiting plate 74 is larger than the diameter of the end of the truncated cone-shaped curling head 75. With this arrangement, when the truncated cone-shaped curling head 75 approaches the lower end of the water heater outer shell 6 and moves upward at the same time, the lower end of the water heater outer shell 6 can be gradually curled, and the limiting plate 74 abuts against the outer side wall of the bottom of the water heater outer shell 6, so that the lower end of the water heater outer shell 6 forms a curling edge that is curled inwards;

[0045] The connecting mechanism includes a transverse connecting tube 77 located in a cavity 81 inside the vertical shell 71 and a fourth spring 79 arranged in the transverse connecting tube 77. The piston rod 80 at the bottom output end of the electric telescopic rod 72 extends into the cavity 81 and is connected to the middle of the top of the transverse connecting tube 77; and a piston disk 78 is provided on the connecting rod 73, which is slidably connected to the inside of the transverse connecting tube 77. The fourth spring 79 is sleeved on the connecting rod 73. Under the elastic force of the fourth spring 79 on the piston disk 78, the end of the connecting rod 73 passes through the transverse connecting tube 77 and is tightly attached to the triangular slope 76 on the vertical inner wall of the cavity 81.

[0046] When the outer shell 6 of the water heater is seated on the upper end of the support plate 8, the truncated cone-shaped crimping head 75 is located below the outer shell 6 of the water heater. Then, the electric telescopic rod 72 drives the transverse connecting tube 77 and the crimping head assembly to move upward synchronously through the retraction of the piston rod 80, so that the truncated cone-shaped crimping head 75 of the crimping head assembly contacts the lower end of the outer shell 6 of the water heater. At the same time, the end of the connecting rod 73 of the crimping head assembly (i.e. Figure 6 and Fig.10 The right end in the middle of the water heater shell 6 gradually slides onto the triangular slope 76, so that the connecting rod 73 and the piston plate 78 move to the left along the transverse connecting tube 77, so that the limiting plate 74 gradually abuts against the outer wall of the bottom of the water heater shell 6, and under the upward movement of the truncated cone-shaped curling head 75, the lower end of the water heater shell 6 forms a curling edge and curls inward;

[0047] When the connecting rod 73 and the piston disc 78 move to the left along the transverse connecting tube 77, the piston disc 78 compresses the fourth spring 79, and when the electric telescopic rod 72 drives the transverse connecting tube 77 and the curling head assembly to move downward synchronously through the extension of the piston rod 80, under the elastic force of the fourth spring 79 on the piston disc 78, the connecting rod 73 and the piston disc 78 move to the right along the transverse connecting tube 77 until the curling head assembly and the connecting mechanism are reset.

[0048] Specifically, when in use, the outer shell 6 of the water heater is accurately sleeved downward on the outside of the rubber seat 3, and then the outer shell 6 of the water heater is pushed downward. At this time, under the action of the friction between the outer shell 6 of the water heater and the rubber seat 3, the outer shell 6 of the water heater drives the rubber seat 3, the vertical rod 10 and the truncated cone seat 14 to move downward as a whole;

[0049] When the truncated pedestal seat 14 moves downward, the first spring 9 is gradually compressed, and the truncated pedestal seat 14 abuts against the triangular inclined plate 18, thereby pushing the tensioning plate 11 to move along the slot 12, until the tensioning plate 11 extends out of the slot 12 and is closely attached to the inner wall of the water heater outer shell 6, so that the tensioning plate 11 can tighten and fix the water heater outer shell 6;

[0050] At this time, the limiting plate 19 also slides along the limiting groove 16, so that the second spring 20 is gradually in a compressed state;

[0051] Until the lower end of the water heater outer shell 6 is seated on the upper end of the support plate 8, at this time, the support plate 8 will remain in a horizontal state and move downward along the vertical polished rod 22, and the third spring 21 will gradually be in a compressed state;

[0052] Then the PLC controller controls the motor 23 to work, so that the motor 23 drives the turntable 2 to rotate through the motor shaft 4, so that the turntable 2 drives the outer shell 6 of the water heater to rotate synchronously;

[0053] Then, the PLC controller controls the electric telescopic rod 72 to work. The electric telescopic rod 72 drives the horizontal connecting tube 77 and the crimping head assembly to move upward synchronously through the retraction of the piston rod 80, so that the truncated cone crimping head 75 of the crimping head assembly contacts the lower end of the water heater outer shell 6. At the same time, the end of the connecting rod 73 of the crimping head assembly gradually slides onto the triangular slope 76, so that the connecting rod 73 and the piston plate 78 move to the left along the horizontal connecting tube 77 (at this time, the fourth spring 79 is gradually in a compressed state), so that the limit plate 74 gradually abuts against the outer wall of the bottom of the water heater outer shell 6, and under the upward movement of the truncated cone crimping head 75, the lower end of the water heater outer shell 6 forms a crimping edge and curls inward.

[0054] After the hemming operation is completed, the PLC controller controls the motor 23 to stop working, so that the turntable 2 drives the water heater outer shell 6 to stop rotating synchronously, and the PLC controller controls the electric telescopic rod 72 to work. The electric telescopic rod 72 drives the transverse connecting tube 77 and the hemming head assembly to move downward synchronously through the extension of the piston rod 80. At this time, under the elastic force of the fourth spring 79 on the piston disc 78, the connecting rod 73 and the piston disc 78 move to the right along the transverse connecting tube 77 until the hemming head assembly and the connecting mechanism are reset;

[0055] Then, the outer shell 6 of the water heater is lifted upward. When the outer shell 6 of the water heater is lifted upward, the friction between the outer shell 6 of the water heater and the rubber seat 3, and the elastic force of the first spring 9 on the round pedestal seat 14 can ensure that the rubber seat 3, the vertical rod 10 and the round pedestal seat 14 are moved upward and reset as a whole;

[0056] When the truncated pedestal 14 moves upward and no longer abuts against the triangular inclined plate 18, the tensioning plate 11 moves inward along the slot 12 under the elastic force of the second spring 20 on the limit plate 19, and the tensioning plate 11 retracts to the slot 12 to achieve the reset of the tensioning plate 11. At this time, the tensioning plate 11 is out of contact with the inner wall of the outer shell 6 of the water heater;

[0057] Continue to lift up the water heater outer shell 6, and when the friction between the water heater outer shell 6 and the rubber seat 3 is overcome, the water heater outer shell 6 is separated from the rubber seat 3, so that the water heater outer shell 6 is removed.

[0058] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A one-step forming mold for curling the shell of a water heater, comprising a workbench, characterized in that: The upper end of the workbench is provided with a turntable driven to rotate by a motor, and the turntable is also provided with a tensioning mechanism for tensioning and fixing the outer shell of the water heater. When the outer shell of the water heater is downwardly sleeved on the outer side of the turntable, the outer shell of the water heater drives the tensioning mechanism to be tensioned on the inner wall of the outer shell of the water heater; The upper end of the workbench is also provided with support mechanisms which are evenly spaced and distributed on the side of the turntable, and the support mechanisms are used to support the lower end of the outer shell of the water heater; The upper end of the workbench is also provided with a curling mechanism, which includes a vertical shell fixed to the upper end of the workbench, an electric telescopic rod arranged on the top of the vertical shell, and a curling head assembly extending out of the vertical shell; The electric telescopic rod drives the curling head assembly to move upward and contact the lower end of the water heater outer shell through the connecting mechanism, while the curling head assembly is gradually pushed toward the inner side of the lower end of the water heater outer shell. When the turntable drives the water heater outer shell to rotate, the curling head assembly realizes the curling operation on the lower end of the water heater outer shell.

2. A one-step forming die for curling the shell of a water heater according to claim 1, characterized in that: A vertical hole and a receiving hole at the bottom of the vertical hole are provided in the middle of the turntable, and a plurality of groups of slots distributed at equal intervals are provided on the upper side of the turntable; The inner side of the slot extends to the vertical hole and the receiving hole; The tensioning mechanism comprises a truncated cone seat located in the receiving hole, a vertical rod in the middle of the upper end of the truncated cone seat, a rubber seat connected to the top of the vertical rod after extending out of the vertical hole, and a tensioning plate slidably connected in the slot; The round platform seat is arranged in a shape of being wide at the top and narrow at the bottom, and a triangular inclined plate is connected to the lower inner part of the tensioning plate.

3. A one-step forming die for curling the shell of a water heater according to claim 2, characterized in that: A mounting groove for mounting a first spring is arranged in the center of the bottom of the accommodating hole, and the top of the first spring is connected to the middle part of the lower end of the round table seat.

4. A one-step forming die for curling the shell of a water heater according to claim 2, characterized in that: The inner bottom of the tensioning plate is connected to a limiting plate, the inner side of the slotted bottom is provided with a limiting groove for inserting the limiting plate, and a second spring is connected between the outer side wall of the limiting plate and the side wall of the limiting groove.

5. The one-step forming die for curling the shell of a water heater according to claim 2, characterized in that: The diameter of the top of the rubber seat gradually decreases, and the outer diameter of the lower part of the rubber seat is equal to the inner diameter of the outer shell of the water heater.

6. The one-step forming die for curling the shell of a water heater according to claim 1, characterized in that: The support mechanism includes a support shell fixed to the upper end of the workbench and a support plate extending through a vertical slot inside the support shell; The support plate is supported at the lower end of the outer shell of the water heater, and a vertical light rod penetrating the support plate is provided inside the vertical groove, and a third spring located at the bottom of the support plate is sleeved on the vertical light rod.

7. The one-step forming die for curling the shell of a water heater according to claim 1, characterized in that: The curling head assembly includes a truncated cone-shaped curling head, a limiting plate connected to the end of the truncated cone-shaped curling head, and a connecting rod fixed at the middle of the end of the limiting plate. The diameter of the limiting plate is larger than the diameter of the end of the truncated cone-shaped curling head.

8. The one-step forming die for curling the shell of a water heater according to claim 7, characterized in that: The connection mechanism includes a transverse connection tube located in a cavity inside the vertical housing and a fourth spring arranged in the transverse connection tube, and the piston rod at the output end of the bottom of the electric telescopic rod extends into the cavity and is connected to the middle of the top of the transverse connection tube; A piston disk is provided on the connecting rod and is slidably connected to the inside of the transverse connecting tube. The fourth spring is sleeved on the connecting rod. Under the elastic force of the fourth spring on the piston disk, the end of the connecting rod passes through the transverse connecting tube and is tightly attached to the triangular slope on the vertical inner wall of the cavity.

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