Water swelling mold for cup body and processing technology of cup body

Abstract

The present invention discloses a water swelling mold for a cup body and a processing technology for the cup body, wherein the cup body comprises at least two layers of a tube body, and the water swelling mold comprises an upper mold and a lower mold, wherein the upper mold and the lower mold cooperate to form a cavity, wherein the cavity comprises a cavity segment distributed along the height direction and corresponding to the tube body one by one, wherein the inner wall of the cavity segment defines the outer shape corresponding to the tube body after swelling; a mold core is disposed in the cavity, and the mold core is provided with a water supply hole for supplying water to the cavity to achieve swelling. In the water swelling mold of this scheme, after the swelling is completed and demoulded, the swollen tube blank is divided to obtain a tube body of a desired shape and quantity. It can be seen that after the water swelling process is completed once and then divided, the water swelling mold simultaneously forms an outer tube and an inner tube, or more than two tube bodies, thereby saving processes and reducing the number of operators. The reduction in processes can correspondingly improve the safety of the operation.

Description

Technical Field

[0001] The invention relates to the technical field of cup body processing, and in particular to a water swelling mould for a cup body and a processing technology for the cup body. Background Art

[0002] Thermos cups generally have a double-layer structure, including an inner tube and an outer tube.

[0003] The processing flow of inner tube is generally: tube making - water swelling - splitting - shrinking - rolling - cutting;

[0004] The processing flow of outer tube is generally: tube making - water swelling - splitting - shrinking - rolling - wheel R - cutting.

[0005] In the above production process, the outer tube and the inner tube are processed separately, the process is complicated, and the inner tube processing production line requires 6 operators and the outer tube production line requires 7 operators, resulting in high personnel investment costs. Summary of the invention

[0006] The present invention provides a water swelling mold for a cup body, wherein the cup body comprises at least two layers of a tube body, and the water swelling mold comprises an upper mold and a lower mold, wherein the upper mold and the lower mold cooperate to form a cavity, wherein the cavity comprises cavity segments distributed along a height direction and corresponding one to one with the tube body, wherein the inner wall of the cavity segment defines an outer shape corresponding to the tube body after swelling; a mold core is disposed in the mold cavity, and the mold core is provided with a water supply hole for supplying water to the mold cavity to achieve swelling.

[0007] Optionally, the lower mold includes a lower mold body and a closing module, the closing module includes two or more sub-modules, and a plurality of the sub-modules are circumferentially assembled to form a ring-shaped closing module; the closing module is located between the upper mold and the lower mold body, and the inner wall of the closing module protrudes from the inner walls of the upper mold and the lower mold body adjacent thereto, so that the formed tube body has an annular groove.

[0008] Optionally, the lower end surface of the upper mold forms a first inclined surface, and the upper end surface of each sub-module of the combined module forms a second inclined surface. When the upper mold is pressed downward, the first inclined surface and the second inclined surface cooperate to drive each sub-module to move toward the center line of the water swelling mold to be assembled to form the combined module.

[0009] Optionally, an annular groove is provided on the upper end surface of the lower mold body, the lower end of the sub-module is placed in the annular groove, the upper end of the sub-module is located above the upper end surface of the inner groove wall of the annular groove, and the inner wall protrudes from the inner wall of the adjacent lower mold body and the upper mold;

[0010] A latch is provided through the outer groove wall of the annular groove, one end of which is connected to the corresponding submodule; a spring is also provided, which is located between the other end of the latch and the outer groove wall. When the submodules are assembled, the spring is in a compressed state.

[0011] Optionally, it also includes an upper mold and a lower mold, and the upper mold and the lower mold are both installed between the upper mold and the lower mold; the mold core includes an upper mold core and a lower mold core, the upper mold core is provided with a mounting hole to be fixed to the upper mold by an inserted mounting pin, and the water supply hole is provided in the lower mold core.

[0012] Optionally, it also includes an upper mold cushion block and an upper mold positioning block, wherein the upper mold cushion block is fixed to the upper mold plate and is located between the upper mold plate and the upper mold, and the upper mold positioning block clamps the upper mold cushion block and the upper mold in a ring direction.

[0013] Optionally, an upper spring clip positioning block is fixed to the bottom of the upper template, and a lower spring clip positioning block is fixed to the top of the lower template; the water swelling mold also includes an upper spring clip and a lower spring clip, the upper spring clip positioning block positions the upper spring clip, the upper spring clip clamps the top periphery of the upper mold core, and the upper spring clip is provided with the mounting pin; the lower template is provided with an axially through water inlet hole, the lower spring clip positioning block is provided with an axially through water supply channel, and the water supply channel connects the water inlet hole and the water supply hole of the lower mold core.

[0014] Optionally, the lower spring clamp positioning block is provided with a step with the step surface facing upward, and a receiving groove is formed between the step and the inner wall of the lower mold, and a sealing portion is built into the receiving groove.

[0015] Optionally, a groove is provided at the bottom of the lower mold core, and the step of the lower spring clamp positioning block is inserted into the groove for positioning.

[0016] Optionally, a lower die pad is further included, wherein the lower die pad is located between the lower mold plate and the lower die, and the lower die and the lower die pad, as well as the lower die pad and the lower mold plate, are all fixed by fasteners.

[0017] The present invention also provides a cup body processing technology, the cup body includes at least two layers of tube bodies, including the following steps:

[0018] Pipe making, forming a tube blank, wherein the tube blank corresponds to each of the tube bodies at the same time;

[0019] Water swelling, using any of the water swelling molds described above to perform water swelling;

[0020] Splitting: splitting the water-swollen tube blank into the required tube bodies.

[0021] In the water swelling mold of this scheme, when water swelling is carried out, pressurized water enters the tube blank from the water supply hole of the mold core, and the tube blank expands under the action of water pressure. When it expands to the inner wall of the cavity, the expansion amount is limited, and finally fits to the inner wall of the cavity, that is, the outer contour of the tube blank after water swelling matches the inner wall of the cavity. After the water swelling is completed and demoulded, the water-swollen tube blank (belonging to the processing intermediate piece) is divided, and the division position corresponds to the boundary between adjacent cavity segments, so that the required shape and number of tube bodies can be obtained. It can be seen that after the water swelling mold is completed once and then divided, the outer tube and the inner tube, or more than two tube bodies, are formed at the same time. In addition, the tube body is formed in the same water swelling process, and accordingly, the upstream pipe making process is also the same process, which can reduce the setting of the assembly line. It can be seen that this scheme can save processes and reduce the number of operators. The reduction of processes can correspondingly improve the safety of operations and reduce the generation of waste, which is conducive to the realization of green production. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic structural diagram of a specific embodiment of the water swelling mold for a cup body provided by the present invention;

[0023] Figure 2 for Figure 1 A schematic diagram of a tube blank provided on the outer sleeve of the middle mold core;

[0024] Figure 3 for Figure 1 Schematic diagram of the structure of the middle and upper mold;

[0025] Figure 4 for Figure 1 Schematic diagram of the middle and lower membranes and the combined module after installation;

[0026] Figure 5 for Figure 1 Schematic diagram of the middle mold core.

[0027] Figure 6 The present invention is a flowchart of the manufacturing process of a double-layer cup body using the water swelling mold provided by the invention.

[0028] Figure 1-5 The reference numerals in the drawings are described as follows:

[0029] 10 upper template, 11 upper spring clip positioning block, 12 upper mold pad, 13 upper spring clip, 14 upper mold + positioning block, 151 upper mold, 151a first inclined surface, 152 lower mold body, 152a outer groove wall, 152b inner groove wall, 152c annular groove, 153 closing module, 153a second inclined surface, 161 upper mold core, 161a mounting hole, 162 lower mold core, 162a water supply hole, 162b axial channel, 162c groove, 17 sealing part, 18 lower spring clip positioning block, 181 water supply channel, 19 latch, 20 lower template, 20a water inlet hole, 21 spring, 22 lower mold pad, 23 mounting pin, 100 tube blank. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0031] Please refer to Figure 1 , Figure 1 A schematic structural diagram of a specific embodiment of the water swelling mold for a cup body provided by the present invention is shown, which is an axial cross-sectional view of the water swelling mold, with some parts shown with section lines and others not shown; Figure 2 for Figure 1 A schematic diagram of a tube blank 100 is provided on the outer sleeve of the middle mold core.

[0032] The water swelling mold in this embodiment is mainly used to process a cup body with a double-layer or multi-layer structure, that is, the cup body includes two or more layers of tube bodies. For example, a double-layer cup body includes an inner tube and an outer tube. The cup body configured in this way is usually a thermos cup, and generally, vacuum is drawn between adjacent tube bodies to isolate heat transfer and achieve a heat preservation effect.

[0033] The water swelling mold in this embodiment includes an upper mold 151 and a lower mold, both of which have an annular cavity. After the upper mold 151 and the lower mold are matched, the upper annular cavity and the lower annular cavity are joined to form a cavity. The cavity specifically includes two or more cavity segments distributed along the height direction. Figure 1 In the embodiment, a first cavity segment and a second cavity segment are included, and the two cavity segments are distributed upper and lower. The inner wall of the first cavity segment defines the outer shape of the inner tube after swelling, and the second cavity segment defines the outer shape of the outer tube after swelling. It can be understood that when the cup body includes multiple layers of tube bodies, cavity segments corresponding to the number of tube bodies are set. Figure 1 In the figure, the upper part of the upper mold 151 corresponds to the first cavity segment, and the lower part and the lower mold correspond to the second cavity segment. The distribution of the specific cavity segments can be designed and adjusted, and is not limited to this.

[0034] The inner wall shape of the corresponding cavity segment can be designed according to the modeling requirements of different tube bodies. For two adjacent layers of tube bodies, the diameter of the tube body located in the inner layer is obviously smaller, and the diameter of the corresponding cavity segment is also designed to be relatively smaller. Therefore, in this solution, after the upper mold 151 and the lower mold are molded together, the different cavity segments of the cavity have different diameters. Of course, the different tube bodies of the cup body may also be designed with non-equal diameters, and the corresponding cavity segments themselves are also designed with unequal diameters accordingly.

[0035] Figure 2 In the embodiment, a mold core is built into the mold cavity formed by the upper mold 151 and the lower mold. The mold core is provided with a water supply hole 162a for supplying water to the mold cavity, and a tube blank 100 is disposed outside the mold core. The tube blank 100 is used as the blank of different tube bodies of the cup body, that is, all tube bodies share one tube blank 100, specifically, as the blank of the inner tube and the outer tube in this embodiment. When water swelling is performed, pressurized water enters the tube blank 100 from the water supply hole 162a of the mold core, and the tube blank 100 expands under the action of water pressure. When it expands to the inner wall of the mold cavity, the expansion amount is limited, and finally it fits to the inner wall of the mold cavity, that is, the outer contour of the tube blank 100 after water swelling matches the inner wall of the mold cavity. After the water swelling is completed and the mold is demoulded, the water-swollen tube blank 100 (belonging to the processing intermediate piece) is divided, and the dividing position corresponds to the boundary between the first mold cavity section and the second mold cavity section, so that the required inner tube and outer tube can be obtained. There is no restriction on the upper and lower distribution of the first cavity segment and the second cavity segment, and they can also be arranged upside down, so that the upper portion corresponds to processing the outer tube, and the lower portion corresponds to processing the inner tube.

[0036] It can be seen that in the water swelling mold of this embodiment, after the upper mold 151 and the lower mold are closed, the first cavity section and the second cavity section of the cavity correspond to the modeling requirements of the inner tube and the outer tube, so that after completing a water swelling process, the outer tube and the inner tube are formed at the same time. When the number of tubes required for the cup body exceeds two, it can also be completed at the same time by a set of water swelling molds, and then divided. In addition, the tube body is formed in the same water swelling process, and accordingly, the upstream pipe making process is also the same process, which can reduce the setting of the assembly line. It can be seen that this solution can save processes and reduce the number of operators. The reduction of processes can correspondingly improve the safety of operations and reduce the generation of waste, which is conducive to achieving green production.

[0037] Please continue to refer to Figure 1 , and refer to Figure 3 , 4 understand, Figure 3 for Figure 1 A schematic structural diagram of the middle upper mold 151; Figure 4 for Figure 1 Schematic diagram of the middle and lower molds and the combined module 153 after installation.

[0038] In this embodiment, the lower mold of the water-swelling mold further includes a lower mold body 152 and a closing module 153. The lower mold body 152 and the upper mold 151 are an annular integral structure. The closing module 153 includes two or more sub-modules, and the multiple sub-modules are spliced ​​along the circumferential direction to form an annular closing module 153. In this embodiment, two sub-modules are specifically provided. Figure 1 As shown, the combining module 153 is located between the upper mold 151 and the lower mold body 152, and at least part of the inner wall of the combining module 153 protrudes from the inner walls of the adjacent upper mold 151 and the lower mold body 152, that is, after the combining module 153, the upper mold 151, and the lower mold body 152 cooperate, the inner wall of the entire cavity formed will form an annular protrusion at the position of the combining module 153, and the corresponding tube body formed after the water rises will form an annular groove. In this embodiment, the annular protrusion corresponds to the second cavity section, which is used to form the outer tube, and the outer wall of the outer tube will form an annular groove.

[0039] It can be seen that the arrangement of the closing module 153 facilitates modeling and forms the required annular groove. When the annular groove is not required, the closing module 153 may not be arranged, and only the upper mold 151 and the lower mold body 152 are composed. The closing module 153 formed by the sub-modules is arranged, and when demolding, the sub-modules can be pulled outward to achieve demolding without interference from the upper and lower groove walls of the molded annular groove. It should be understood that the upper mold 151 and the lower mold body 152 need to be an integral annular structure to ensure the stability and sealing performance of the overall modeling. The arrangement of a small section of sub-modules is only for modeling needs.

[0040] Please continue to refer to Figure 3 , 4 , the lower end surface of the upper mold 151 forms a first inclined surface 151a, and the first inclined surface 151a gradually tilts upward from the outside to the inside. The upper end surfaces of each sub-module of the closing module 153 form a second inclined surface 153a, and the second inclined surface 153a also gradually tilts upward from the outside to the inside. When the upper mold 151 is pressed down, the first inclined surface 151a and the second inclined surface 153a cooperate to generate an inward component force, which can drive each sub-module to move toward the center line of the water-swelling mold to form the closing module 153 and form a better sealing effect. With such a configuration, the closing process of the closing module 153, the upper mold 151, and the lower mold body 152 is realized during the pressing process of the upper mold 151. Of course, it is also possible not to set the inclined surface, and it is also feasible to push the sub-module to move toward the center line by manpower or a special driving part, but it is obvious that the closing process is automatically realized by setting the inclined surface to press down, and the control is simpler.

[0041] Please continue to refer to Figure 4In the water swelling mold, the upper end surface of the lower mold body 152 is provided with an annular groove 152c, the lower end of the submodule is placed in the annular groove 152c, the upper end of the submodule is located on the upper end surface of the inner groove wall 152b of the annular groove 152c, and the inner wall of the upper end of the submodule protrudes from the inner wall of the adjacent lower mold and upper mold 151 to shape the annular groove of the outer tube or inner tube. It can be understood that according to the number of annular grooves required, multiple component modules can be set, or one component module can form multiple protruding inner wall sections, which are both feasible.

[0042] Furthermore, the lower mold body 152 is provided with the above-mentioned annular groove 152c, and the outer groove wall 152a and the inner groove wall 152b are formed accordingly, the inner groove wall 152b is close to the center line of the water-swelling mold, and the outer groove wall 152a is relatively far away from the center line. Among them, the outer groove wall 152a is penetrated by a latch 19, one end of which is connected to the corresponding sub-module, and a spring 21 is also provided, which is located between the other end of the latch 19 and the outer groove wall 152a. Figure 4 The other end of the latch 19 is the large diameter end, and the spring 21 is sleeved on the main body of the latch 19 and respectively pressed against the outer groove wall 152a and the large diameter end, thereby maintaining the tendency of the latch 19 to move away from the center line of the water swelling mold.

[0043] Then, when the submodule moves toward the center line under the action of the inclined surface and closes the mold, the spring 21 will be compressed, and the spring force on the latch 19 is outward. When demolding, the upper mold 151 moves upward, and the pressure acting on the inclined surface is gradually removed, and the component force in the center line direction generated by the pressure is also removed. Under the action of the spring force, the latch 19 will drive the corresponding submodule to move outward to achieve automatic demolding. Of course, it is also possible not to set the spring 21 and the latch 19, and demolding can be directly pulled by other driving parts or manually pulled, but it is obvious that the structure of this method is simpler and easier to operate, and demolding can be achieved when the pressure of the upper mold 151 is removed.

[0044] Please continue viewing Figure 1 The water-inflated mold specifically includes an upper mold plate 10 and a lower mold plate 20 located at the top and bottom, respectively. The upper mold 151 and the lower mold are both installed between the upper mold plate 10 and the lower mold plate 20. Specifically, the water-inflated mold also includes an upper mold pad 12 and an upper mold positioning block 14. The upper mold pad 12 is fixed to the upper mold plate 10 and can be fastened to the upper mold plate 10 by fasteners. The fasteners can be positioning pins, bolts, etc. Of course, other connection methods can also be used, such as welding. The upper mold pad 12 is between the upper mold plate 10 and the upper mold 151. The upper mold 151 and the upper mold pad 12 are tightly attached. The upper mold positioning block 14 clamps the upper mold pad 12 and the upper mold 151 from the ring upward to achieve the fastening of the upper mold pad 12 and the upper mold 151.

[0045] In addition, an upper spring clamp positioning block 11 is fixed to the bottom of the upper template 10. Figure 1 The middle upper spring clip positioning block 11 is arranged at the middle of the bottom of the upper mold plate 10 and is located inside the upper mold cushion block 12 . The upper spring clip positioning block 11 positions the upper spring clip 13 , and the upper spring clip 13 is provided with a mounting pin 23 .

[0046] Please refer to Figure 5 understand, Figure 5 for Figure 1 Schematic diagram of the middle mold core.

[0047] The mold core includes an upper mold core 161 and a lower mold core 162. The upper spring clip 13 clamps the upper end of the upper mold core 161. Figure 5 The end of the middle upper mold core 161 is tapered, which has a guiding effect. In addition, the upper mold core 161 is provided with a mounting hole 161a that at least passes through its top, and the mounting pin 23 is fixed to the upper spring clamp positioning block 11. Specifically, a groove can be provided at the bottom of the upper spring clamp positioning block 11, and the top of the mounting pin 23 is tied into a circle with a rubber band, and then pressed into the groove for fixing. The mounting pin 23 is inserted into the mounting hole 161a of the upper mold core 161 to achieve the positioning of the upper mold core 161 and the upper mold plate 10. The above-mentioned water supply hole 162a is provided in the lower mold core 162. The mold core is provided as an upper mold core 161 and a lower mold core 162, which is convenient for demoulding. Moreover, the mold core is relatively long and is divided into upper and lower sections for easy processing. In order to facilitate installation and positioning, a groove 162c can be provided on the upper end surface of the lower mold core 162, and a protrusion is provided on the lower end surface of the upper mold core 161, and the protrusion is inserted into the groove 162c for positioning.

[0048] Similarly, the top of the lower template 20 is also fixed with a lower spring clamp positioning block 18 and a lower spring clamp (not shown in the figure) connected thereto. The lower spring clamp can clamp the lower mold core 162 and is conducive to sealing the water so that the water forms pressure in the mold cavity. The lower spring clamp positioning block 18 is specifically located in the middle of the top of the lower template 20. In addition, the lower template 20 is provided with an axially through water inlet hole 20a, and water flows into the water swelling mold from the water inlet hole 20a. The lower spring clamp positioning block 18 is provided with an axially through water supply channel 181. The water entering from the lower template 20 enters the water supply channel 181 and is further connected to the water supply hole 162a of the lower mold core 162. Figure 5 In the figure, the lower mold core 162 is provided with an axial channel 162b and a radial water supply hole 162a. The water supply channel 181 is connected to the axial channel 162b, and then flows radially to the water supply hole 162a, and then flows to the cavity. Multiple water supply holes 162a can be arranged along the circumferential direction. In this embodiment, two water supply holes are arranged to achieve the purpose of water expansion molding.

[0049] Figure 1In the embodiment, the lower spring clamp pad is provided with a step with the step surface facing upward, and a receiving groove is formed between the step and the inner wall of the lower mold, specifically, the receiving groove is formed between the step and the inner wall of the lower mold body 152, and an annular sealing portion 17 is built into the receiving groove (the lower spring clamp is located on the upper part of the sealing portion 17), so as to ensure that the water flow does not overflow from the cavity and ensure the effect of water rise, and the sealing portion 17 can be a high-strength rubber sealing ring. The lower end of the lower mold core 162 is provided with a bottom groove with a notch facing downward, and the step of the lower spring clamp pad is inserted into the bottom groove to achieve coaxial positioning with the lower mold core 162.

[0050] The water swelling mold further comprises a lower mold pad 22, which is located between the lower mold plate 20 and the lower mold and is covered with a lower spring clip. Figure 1 In the figure, the lower spring pad is provided with a step surface facing downward, and the lower spring clamp positioning block 18 is provided with a step surface facing upward, and the two step surfaces are fitted together to achieve axial positioning of the lower pad and the lower spring clamp positioning block 18. The lower die pad 22 and the lower die, and the lower die pad 22 and the lower die plate 20 can be fixed by fasteners, and the fasteners can be positioning pins, bolts, etc. Of course, other connection methods can also be used, such as welding.

[0051] The assembly and water swelling process of the water swelling mold in the above embodiment can be carried out according to the following steps:

[0052] Install the lower spring clamp positioning block 18 and the lower die cushion block 22 on the lower die plate 20; install the upper die cushion block 12, the upper die 151, and the upper die positioning block 14 on the upper die plate 10;

[0053] Install the lower mold body 152 on the lower mold pad 22;

[0054] Install the sealing part 17, the upper mold core 161, and the lower mold core 162 (the closing module 153 can be pre-assembled on the lower mold core 162, or installed after the lower mold core 162 is installed on the lower spring clamp positioning block 18) on the lower spring clamp positioning block 18;

[0055] Covering the tube blank 100 with a mold core;

[0056] The upper mold plate 10 moves downward under the action of the driving part of the workbench, so that the upper spring clip 13 and its mounting pin 23 installed thereon are positioned with the upper mold core 161, and the sub-modules are close together and attached to the middle to form a combined module 153;

[0057] Inject water into the water inlet 20a of the lower template 20 to perform a water swelling process;

[0058] After the water rise is completed, the upper template 10 moves upward, and the sub-module moves outward under the action of the spring 21 to achieve demoulding;

[0059] The tube blank which is demoulded after swelling with water is divided into an inner tube and an outer tube.

[0060] like Figure 6 As shown, Figure 6 The present invention is a flowchart of the manufacturing process of the outer tube and the inner tube after using the water swelling mold provided by the invention.

[0061] The production of the tube blank 100, i.e. the tube making process, is also carried out in the same process. The tube blank 100 formed corresponds to each required tube body at the same time, and then is water-inflated and divided. For the double-layer cup body, the inner tube and the outer tube are formed after the division, and then the inner tube is subjected to the processes of shrinking, rolling and cutting in sequence, and the outer tube is subjected to the processes of shrinking, rolling, rolling and cutting in sequence. According to the principle that one operator is required for one process, the background technology solution requires 13 operators, and from Figure 6 From this perspective, this solution can be reduced to 10 operators due to the simplification of the process.

[0062] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A water swelling mold for a cup body, wherein the cup body comprises at least two layers of tube bodies, characterized in that: The water swelling mold comprises an upper mold (151) and a lower mold, wherein the upper mold (151) and the lower mold cooperate to form a mold cavity, wherein the mold cavity comprises mold cavity segments distributed along the height direction and corresponding to the tube body one by one, wherein the inner walls of the mold cavity segments define the outer shape of the tube body after water swelling, wherein different mold cavity segments have different diameters, and the boundary between adjacent mold cavity segments is a splitting position, so that after water swelling is completed and demoulding is completed, the mold cavity segments are split at the splitting position to simultaneously form an outer tube and an inner tube or more than two tube bodies; a mold core is disposed in the mold cavity, and the mold core is provided with a water supply hole (162a) for supplying water to the mold cavity to achieve water swelling.

2. The water swelling mold for a cup body according to claim 1, characterized in that: The lower die comprises a lower die body (152) and a closing module (153), wherein the closing module (153) comprises two or more sub-modules, and a plurality of the sub-modules are assembled in a circumferential direction to form an annular closing module (153); the closing module (153) is located between the upper die (151) and the lower die body (152), and an inner wall of the closing module (153) protrudes from inner walls of the adjacent upper die (151) and the lower die body (152), so that the formed tube body has an annular groove.

3. The water swelling mold for a cup body according to claim 2, characterized in that: The lower end surface of the upper mold (151) forms a first inclined surface (151a), and the upper end surface of each sub-module of the combined module (153) forms a second inclined surface (153a). When the upper mold (151) is pressed downward, the first inclined surface (151a) and the second inclined surface (153a) cooperate to drive each sub-module to move toward the center line of the water swelling mold to be assembled to form the combined module (153).

4. The water swelling mold for a cup body as claimed in claim 3, characterized in that: The upper end surface of the lower mold body (152) is provided with an annular groove (152c), the lower end of the sub-module is placed in the annular groove (152c), the upper end of the sub-module is located on the upper end surface of the inner groove wall (152b) of the annular groove (152c), and the inner wall protrudes from the inner wall of the adjacent lower mold body (152) and the upper mold (151); A latch (19) is provided through the outer groove wall (152a) of the annular groove (152c), one end of the latch (19) being connected to the corresponding submodule; a spring (21) is also provided, the spring (21) being located between the other end of the latch (19) and the outer groove wall (152a), and the spring (21) is in a compressed state when the submodules are assembled.

5. The water swelling mold for a cup body according to any one of claims 1 to 4, characterized in that: It also comprises an upper mold plate (10) and a lower mold plate (20), wherein the upper mold plate (151) and the lower mold plate are both installed between the upper mold plate (10) and the lower mold plate (20); the mold core comprises an upper mold core (161) and a lower mold core (162), wherein the upper mold core (161) is provided with a mounting hole (161a) for being fixed to the upper mold plate (10) by means of an inserted mounting pin (23), and the water supply hole (162a) is provided in the lower mold core (162).

6. The water swelling mold for a cup body according to claim 5, characterized in that: It also comprises an upper die pad (12) and an upper die positioning block (14), wherein the upper die pad (12) is fixed to the upper die plate (10) and is located between the upper die plate (10) and the upper die (151), and the upper die positioning block (14) clamps the upper die pad (12) and the upper die (151) in a circumferential direction.

7. The water swelling mold for a cup body according to claim 5, characterized in that: An upper spring clamp positioning block (11) is fixed at the bottom of the upper mold plate (10), and a lower spring clamp positioning block (18) is fixed at the top of the lower mold plate (20); the water swelling mold further comprises an upper spring clamp (13) and a lower spring clamp, the upper spring clamp positioning block (11) positions the upper spring clamp (13), the upper spring clamp (13) clamps the top periphery of the upper mold core (161), and the upper spring clamp (13) is provided with the mounting pin (23); The lower mold plate (20) is provided with an axially penetrating water inlet hole (20a), and the lower spring clamp positioning block (18) is provided with an axially penetrating water supply channel (181), wherein the water supply channel (181) is connected to the water inlet hole (20a) and the water supply hole (162a) of the lower mold core (162).

8. The water swelling mold for a cup body according to claim 7, characterized in that: The lower spring clamp positioning block (18) is provided with a step with the step surface facing upwards, a receiving groove is formed between the step and the inner wall of the lower die, and a sealing portion (17) is built into the receiving groove.

9. The water swelling mold for a cup body according to claim 8, characterized in that: A groove (162c) is provided at the bottom of the lower mold core (162), and the step of the lower spring clamp positioning block (18) is inserted into the groove (162c) for positioning.

10. The water swelling mold for a cup body according to claim 5, characterized in that: It also comprises a lower die pad (22), the lower die pad (22) being located between the lower mold plate (20) and the lower die, the lower die and the lower die pad (22), the lower die pad (22) and the lower mold plate (20) being fixed by fasteners.

11. Processing technology of cup body, the cup body comprises at least two layers of tube body, characterized in that: The steps include: Pipe making, forming a tube blank, wherein the tube blank corresponds to each of the tube bodies at the same time; Water swelling, using the water swelling mold according to any one of claims 1 to 10 for water swelling; Splitting: splitting the water-swollen tube blank into the required tube bodies.

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