Vacuum cup coreless water expansion mold

Abstract

The present invention relates to a coreless water expansion mold for a thermos cup. The lower mold fixing module comprises a lower mold plate, a lower mold head and a positioning block. The lower mold head is fixed on the lower mold plate, and a mounting cavity for fixing the positioning block is arranged on the lower mold head. The lower mold moving module comprises a lower supporting plate, a spring, an ejector pin, a lower supporting platform, polyurethane, a compressed beef tendon block and a water inlet screw. One end of the ejector pin abuts against the lower supporting plate, and the other end abuts against the upper mold module. The lower supporting plate is arranged at the bottom of the lower mold head, one end of the lower supporting platform is arranged on the lower supporting platform, and the other end penetrates into the mounting cavity. The positioning block is inserted into the lower supporting platform. The compressed beef tendon block is detachably fixed to the lower supporting platform through the water inlet screw. Polyurethane is arranged between the compressed beef tendon block and the positioning block. The compressed beef tendon block and the polyurethane are arranged to float along the axial direction of the water inlet screw. The bottom of the cup body blank is sealed. In the mold closing and water injection state, the compressed beef tendon block is compressed by the water pressure in the cup body blank to press the polyurethane. After the polyurethane is squeezed, it abuts against the inner wall of the cup body blank and achieves sealing.

Description

Technical Field

[0001] The invention belongs to the technical field of thermos cup production tools, and in particular relates to a coreless water expansion mold for a thermos cup. Background Art

[0002] Most of the existing water expansion molds for cups have a core rod support structure, and their manufacturing process is relatively mature, but the core rod will scratch the tube material, causing irreversible scrap. The use of coreless water expansion molds not only retains the forming requirements of the thermos cup, but also solves the process scrapping caused by the core rod scratching the tube material.

[0003] In the water swelling mold of conventional cups, water injection core rods and round water sealing tendons are commonly used. The water injection core rod is used to extend into the cup embryo for water injection, and the round water sealing tendon needs to fit the port of the cup liner for water sealing. However, this water swelling process has defects in production:

[0004] (1) The water injection core rod of the conventional water expansion mold is long and has a large top. When the cup embryo is inserted into the water injection core rod, it is easy to scratch the inner wall.

[0005] (2) The port of the water injection core rod of a conventional water expansion mold needs to support the cup embryo and fit the cavity to achieve the water sealing effect. Therefore, the height requirement of the water injection core rod is very high, which often causes problems such as damage or failure to seal water.

[0006] (3) Regarding the water-sealed water-swelling mold, after the water-sealed beef tendon reaches a fracture fatigue state after a period of use, tiny debris will be produced and washed to the port of the water injection core rod by the high-pressure water flow, resulting in a concave point at the bottom of the cup embryo.

[0007] Therefore, the existing conventional water swelling molds are difficult to adapt to the current product quality control requirements and need to be improved. Summary of the invention

[0008] In order to overcome the defects in the prior art that conventional water swelling molds are difficult to adapt to product quality control, and have the problems of the water injection core rod easily causing scratches and dents on the inner wall of the cup blank, the mold not being water-sealed, and having pits, the object of the present invention is to provide a coreless water swelling mold with good water sealing effect, which is not easy to scratch the inner wall of the cup blank and has good molding effect.

[0009] The object of the present invention is achieved in that:

[0010] The coreless water expansion mold for a thermos cup comprises a lower mold fixing module, a lower mold moving module and an upper mold module. The lower mold fixing module comprises a lower mold plate, a lower mold head and a positioning block. The lower mold head is fixed on the lower mold plate. An installation cavity is arranged on the lower mold head. The positioning block is fixedly arranged in the installation cavity. The lower mold moving module comprises a lower support plate, a spring, an ejector pin, a lower support platform, polyurethane, a compressed beef tendon block and a water inlet screw; one end of the ejector pin abuts against the lower support plate, and the other end of the ejector pin abuts against the upper mold module. The lower support plate is arranged at the bottom of the lower mold head, one end of the lower support platform is arranged on the lower support plate, and the other end thereof penetrates into the installation cavity. The positioning block is inserted into the lower support platform, and the compressed beef tendon block is connected to the lower support plate through the water inlet screw. The table is detachable and fixed, polyurethane is arranged between the compressed tendon block and the positioning block, the compressed tendon block and the polyurethane are arranged to float along the axial direction of the water inlet screw, the lower template and the lower support table are respectively provided with water hole one and water hole two, the water inlet screw is connected with water hole two, and the water hole of the water inlet screw is coaxially arranged with water hole one and water hole two, a fixed cavity is formed between the outer periphery of the positioning block, polyurethane and compressed tendon block and the installation cavity for easy insertion of the cup body blank opening, the bottom of the cup body blank is sealed, and when the mold is closed and water is injected, the compressed tendon block is compressed by the water pressure in the cup body blank to press the polyurethane, and after the polyurethane is squeezed, it abuts against the inner wall of the cup body blank and achieves sealing.

[0011] The present invention is further configured as follows: the compressed beef tendon block is in the shape of a truncated cone that is small on the top and large on the bottom.

[0012] The present invention is further configured as follows: the compressed beef tendon block comprises a truncated cone and a cylindrical body, the truncated cone is located at the upper part of the cylindrical body, and the truncated cone is configured to be small at the top and large at the bottom.

[0013] The present invention is further configured such that the ratio between the thickness and the diameter of the cylinder is greater than or equal to 1:8.

[0014] The present invention is further configured as follows: the outer diameter of the polyurethane is less than or equal to the outer diameter of the compressed beef tendon block.

[0015] The present invention is further configured as follows: one end of the positioning block extends outward to form a step, and the opening of the cup body blank abuts against the bottom surface of the step.

[0016] The present invention is further configured as follows: a spring is also arranged between the lower supporting platform and the lower mold plate, an accommodating cavity is arranged at the end of the second water through hole, and the spring is installed in the accommodating cavity. When the mold is opened, the restoring force of the spring causes the lower supporting platform to drive the lower supporting plate to reset upward, and the lower supporting plate drives the ejector pin to pass through the lower mold head.

[0017] The present invention is further configured as follows: the upper mold module comprises an upper mold plate, a mold cavity, and an insert installed in the mold cavity, the end of the insert protrudes from the inner wall of the mold cavity, and the end of the insert is arranged in an arc shape.

[0018] The present invention is further configured as follows: the bottom of the cavity is provided with a wedging surface 1 inclined outward, the end surface of the lower die head is provided with a wedging surface 2 wedged with the wedging surface 1, and in the mold closing state, the wedging surface 1 and the wedging surface 2 are tightly matched.

[0019] The present invention is further configured as follows: a sealing ring is provided between the lower supporting platform and the lower template, the sealing ring is provided on the lower supporting platform, and in the mold closing state, the sealing ring abuts against the lower template for sealing.

[0020] The beneficial effects of the present invention compared with the prior art are as follows: the method of pulling down to seal water is adopted, which avoids the defects such as scratches and bruises on the inner wall of the cup embryo caused by the water injection core rod, the mold not being water-sealed, and pits, and the polyurethane of the consumable part is easy to replace. There is no need to disassemble the entire mold from the equipment. It can be replaced by loosening the water inlet screw, taking out the compressed beef tendon block, and then replacing the polyurethane. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural cross-sectional view of the present invention in a mold closing state;

[0022] Figure 2 This is a structural cross-sectional view of the present invention in a mold-opening state;

[0023] Figure 3 yes Figure 2 A magnified view of part A in FIG.

[0024] Figure 4 It is a schematic diagram of the structure explosion of the lower mold moving module of the present invention;

[0025] Figure 5 It is a schematic diagram of the structure explosion of the lower mold fixing module of the present invention;

[0026] Figure 6 It is a schematic diagram of the structural explosion of the upper mold module of the present invention.

[0027] Meaning of the symbols in the figure:

[0028] 1-lower template; 10-water hole 1; 2-lower die head; 21-installation cavity; 22-tightening surface 2;

[0029] 3-positioning block; 31-step; 4-cup blank; 5-upper template; 6-insert; 7-cavity;

[0030] 71-tightening surface 1; 8-lower supporting plate; 9-lower supporting platform; 91-water hole 2; 92-circular ring; 93-accommodating cavity;

[0031] 11-compressed tendon block; 12-polyurethane; 13-water inlet screw; 131-water hole; 14-thimble;

[0032] 15-spring; 16-sealing ring. DETAILED DESCRIPTION

[0033] The present invention will be further described below with reference to specific embodiments of the present invention:

[0034] See also Figures 1 to 6 As shown, the coreless water expansion mold for the thermos cup includes a lower mold fixing module, a lower mold moving module and an upper mold module. The lower mold fixing module includes a lower mold plate 1, a lower mold head 2 and a positioning block 3. The lower mold head 2 is fixed on the lower mold plate 1, and a mounting cavity 21 is provided on the lower mold head 2. The positioning block 3 is fixedly arranged in the mounting cavity 21. The lower mold moving module includes a lower support plate 8, a spring 15, an ejector pin 14, a lower support platform 9, polyurethane 12, a compressed beef tendon block 11 and a water inlet screw 13; one end of the ejector pin 14 abuts against the lower support plate 8, and the other end of the ejector pin 14 abuts against the upper mold module. The lower support plate 8 is arranged on the lower mold head 2. The bottom of the lower support platform 9, one end of the lower support platform 9 is arranged on the lower support plate 8, and the other end is inserted into the installation cavity 21. The bottom surface of the lower support platform 9 is separated from the end surface of the lower template 1 and a gap of 3 to 6 mm is formed, which is convenient for the compression tendon block 11 to compress and expand the polyurethane 12 to seal. The extension range of the ejector pin 14 is also within the range of this gap. The positioning block 3 is inserted into the lower support platform 9. The compression tendon block 11 is detachably fixed to the lower support platform 9 by the water inlet screw 13. Polyurethane 12 is arranged between the compression tendon block 11 and the positioning block 3. The compression tendon block 11 and the polyurethane 12 are arranged to float along the axial direction of the water inlet screw 13. The lower template 1 and the lower support platform 9 are respectively provided with a water hole 10 and a water hole 2 91, the water inlet screw 13 is connected to the water hole 2 91, and the water hole 131 of the water inlet screw 13 is coaxially arranged with the water hole 10 and the water hole 2 91, and a fixed cavity is formed between the outer periphery of the positioning block 3, the polyurethane 12 and the compressed beef tendon block 11 and the installation cavity 21 to facilitate the insertion of the cup body blank 4 opening, and the bottom of the cup body blank 4 is sealed, that is, the cup body blank 4 has only one opening, which is not a conventional through blank. The cup body blank 4 can be a stainless steel blank. In the mold closing and water injection state, the compressed beef tendon block 11 is cup The water pressure in the cup body blank 4 compresses the polyurethane 12, and the polyurethane 12 is squeezed and abuts against the inner wall of the cup body blank 4 to achieve sealing; the upper mold module is connected to the working platform above the water expansion machine, and the entire upper mold module moves downward with the upper cylinder of the water expansion machine; the downward pull-down water sealing method is adopted to avoid defects such as scratches and bruises on the inner wall of the cup blank caused by the water injection core rod, and defects such as the mold not being water-sealed and pits, and the consumable polyurethane 12 is easy to replace. There is no need to disassemble the entire mold from the equipment. You only need to loosen the water inlet screw 13, take out the compressed beef tendon block 11, and then replace the polyurethane 12.

[0035] In this embodiment, the compressed beef tendon block 11 is in the shape of a truncated cone with a small top and a large bottom; or, the compressed beef tendon block 11 includes a truncated cone body and a cylindrical body, the truncated cone body is located at the upper part of the cylindrical body, and the truncated cone body is small at the top and large at the bottom; such a structure facilitates the insertion of the cup body blank 4 into the fixed cavity, and also facilitates the compressed beef tendon block 11 to extrude the polyurethane 12, so that the polyurethane 12 forms a circumferential seal with the cup body blank 4.

[0036] The thickness of the polyurethane 12 is 10mm-20mm, and the thickness can be 10mm or 20mm. In the present embodiment, the thickness is preferably 15mm. This thickness can effectively guarantee the number of times of expansion while ensuring sealing. It will not easily reach the state of fracture fatigue, will not easily produce tiny debris, and does not need to be replaced frequently.

[0037] The outer diameter of the polyurethane 12 is smaller than or equal to the outer diameter of the compressed beef tendon block 11; in this embodiment, the outer diameter of the polyurethane 12 is preferably smaller than the outer diameter of the compressed beef tendon block 11, so that when the cup body blank 4 is inserted into the positioning block 3, the cup body blank 4 and the polyurethane 12 will not contact each other, thereby avoiding scratches.

[0038] like Figure 3 As shown, one end of the positioning block 3 extends outward to form a step 31, and the opening of the cup body blank 4 abuts against the bottom surface of the step 31. The cup body blank 4 can be sensed by abutting whether it is installed in place, and it is also convenient for operation. At the same time, the cup body blank 4 above the step 31 to the upper end surface of the positioning block 3 is a storage area. Since the height of the product before water swelling is higher than the height of the product after water swelling, the storage area is used to make up for the height difference of the product before and after water swelling. The material at the bottom of the cup body blank 4 can be used as a supplementary material for side drawing to solve the problem of insufficient drawing material for the cup blank, while the existing technology is to directly clamp the opening of the cup body blank with a clamping claw, which can only be adjusted by stretching the material itself.

[0039] A spring 15 is also provided between the lower support platform 9 and the lower mold plate 1. The end of the water hole 91 is provided with a receiving cavity 93. The spring 15 is installed in the receiving cavity 93. When the mold is opened, the reset force of the spring 15 causes the lower support platform 9 to drive the lower support plate 8 to reset upward, and the lower support plate 8 drives the ejector 14 to pass through the lower die head 2. The upper cylinder of the water expansion machine drives the upper mold module to move downward. When the cavity 7 hits the ejector 14, the spring 15 begins to be compressed, driving the lower mold moving module to move downward together. The distance of the ejector 14 passing through the lower die head 2 is 3mm. At the same time, the polyurethane 12 begins to compress, and after expanding, the cup body blank 4 is clamped. Finally, the cavity 7 and the lower die head 2 meet together to complete the mold closing action. The distance between the outer wall of the polyurethane 12 and the inner wall of the cup body blank 4 is 0.1mm-3mm; and the distance between the outer wall of the polyurethane 12 and the inner wall of the cup body blank 4 is preferably 1.1mm, so that after the mold closing is completed, the polyurethane 12 and the cup body blank 4 form a tight seal.

[0040] The upper mold module includes an upper mold plate 5, a cavity 7, and an insert 6 installed in the cavity 7. The end of the insert 6 protrudes from the inner wall of the cavity 7. The end of the insert 6 is arranged in an arc shape. The arrangement of the insert 6 is used to realize that the bottom of the cup body forms an inwardly concave shape when the cup body blank 4 is formed. At the same time, the arrangement of the insert 6 is convenient for replacement and maintenance. The lower mold plate 1 and the upper mold plate 5 mainly serve to connect the water expansion machine and the mold; at the same time, the cooperation between the cavity 7 and the insert 6 mainly determines the final shape of the cup body blank 4 after water expansion.

[0041] like Figure 2 As shown, the bottom of the cavity 7 is provided with a wedging surface 71 inclined outward, and the end face of the lower die head 2 is provided with a wedging surface 22 wedged with the wedging surface 71. In the mold closing state, the wedging surface 71 and the wedging surface 22 are tightly matched, which plays a mold closing guide role. The sealing of the mold after mold closing is achieved through the cooperation of the two wedging surfaces, and it is also a guarantee of coaxiality after mold closing. The angle of the wedging surface 71 and the wedging surface 22 is set to a taper of 6° to 15°. If the taper is too small, the friction force increases, and demolding is difficult; if the taper is too large, the larger the outer diameter of the shell water swelling mold and the inner liner water swelling mold, the larger the occupied area, the increased mold weight, the inconvenient disassembly and assembly, and the poor practicality. The present invention adopts the above-mentioned taper range to ensure the stability and accuracy of the mold opening and closing process.

[0042] A sealing ring 16 is provided between the lower support platform 9 and the lower template 1. The sealing ring 16 is provided on the lower support platform 9. The lower support platform 9 is provided with a ring 92 for installing the sealing ring 16. In the mold closing state, the sealing ring 16 abuts against the lower template 1 for sealing, thus playing a role of sealing water between the lower mold moving module and the lower template 1. The sealing ring 16 is an O-type sealing ring 16 made of silicone material, which is a commonly used silicone ring in this field, and is easy to purchase and reduces costs.

[0043] The specific operation method is as follows: when the mold is opened, the cup body blank 4 is inserted into the step 31 of the positioning block 3, and then the mold is closed. When the wedge surface 1 71 and the wedge surface 2 22 are guided to close the mold, the lower end surface of the cavity 7 abuts against the ejector pin 14, and the ejector pin 14 drives the lower support plate 8 to move downward, and the lower support platform 9 on the lower support plate 8 drives the compressed beef tendon block 11 fixed to it by the water inlet screw 13 to move downward, and the compressed beef tendon block 11 squeezes the polyurethane 12 on the positioning block 3 to expand circumferentially, and the polyurethane 12 is pressed against the peripheral wall of the cup body blank 4 and sealed; the high-pressure water of the water expansion machine will enter the water hole 131 of the water inlet screw from the water hole 10 and the water hole 2 91, and enter the cup body blank 4. Through the pressure of the water, the cup body blank 4 is expanded to fit the inner cavity of the cavity 7 and the insert 6. During the expansion process, the polyurethane 12 can well seal and fix the mouth of the cup body blank 4 to avoid water leakage, thereby ensuring that the joint will not leak under the action of the expansion pressure and ensuring the stability of the expansion pressure.

[0044] During the mold opening process, the water expansion machine first releases the water pressure inside the mold, and the upper cylinder of the water expansion machine drives the upper mold module to move upward. At the same time, the spring 15 pushes the lower mold moving module upward until the upper end surface of the lower support plate 8 hits the lower mold head 2. At this time, the polyurethane 12 rebounds. After the upper mold module rises to a safe distance, the expanded cup body blank 4 can be directly taken out.

[0045] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A coreless water expansion mold for a thermos cup, comprising a lower mold fixing module, a lower mold moving module and an upper mold module, wherein the lower mold fixing module comprises a lower mold plate (1), a lower mold head (2) and a positioning block (3), wherein the lower mold head (2) is fixed on the lower mold plate (1), and an installation cavity (21) is provided on the lower mold head (2), wherein the positioning block (3) is fixedly provided in the installation cavity (21), and wherein the positioning block (3) is characterized in that: The lower die moving module comprises a lower support plate (8), a spring (15), an ejector pin (14), a lower support platform (9), polyurethane (12), a compression tendon block (11) and a water inlet screw (13); one end of the ejector pin (14) is in contact with the lower support plate (8), and the other end of the ejector pin (14) is in contact with the upper die module; the lower support plate (8) is arranged at the bottom of the lower die head (2); one end of the lower support platform (9) is arranged on the lower support plate (8) and the other end is inserted into the mounting cavity (21); the positioning block (3) is inserted into the lower support platform (9); the compression tendon block (11) is detachably fixed to the lower support platform (9) by the water inlet screw (13); polyurethane (12) is arranged between the compression tendon block (11) and the positioning block (3); the compression tendon block (11) and the polyurethane (12) are arranged along the axis of the water inlet screw (13). The lower mold plate (1) and the lower support platform (9) are respectively provided with a first water hole (10) and a second water hole (91); the water inlet screw (13) is connected to the second water hole (91); and the water hole (131) of the water inlet screw (13) is coaxially arranged with the first water hole (10) and the second water hole (91); a fixed cavity is formed between the outer periphery of the positioning block (3), the polyurethane (12) and the compressed beef tendon block (11) and the installation cavity (21) to facilitate the insertion of the cup body blank (4); the bottom of the cup body blank (4) is sealed; when the mold is closed, the upper mold module abuts against the ejector pin (14) and drives the compressed beef tendon block (11) to move downward, the polyurethane (12) is compressed by the compressed beef tendon block (11), and the polyurethane (12) is squeezed and abuts against the inner wall of the cup body blank (4) to achieve sealing.

2. The coreless water expansion mold for the thermos cup according to claim 1, characterized in that: The compressed beef tendon block (11) is in the shape of a truncated cone that is smaller at the top and larger at the bottom.

3. The coreless water expansion mold for the thermos cup according to claim 1, characterized in that: The compressed beef tendon block (11) comprises a truncated cone and a cylindrical body, wherein the truncated cone is located on the upper part of the cylindrical body, and the truncated cone is arranged to be smaller at the top and larger at the bottom.

4. The coreless water expansion mold for the thermos cup according to claim 3, characterized in that: The thickness of the polyurethane (12) is 10 mm to 20 mm.

5. The coreless water expansion mold for a thermos cup according to any one of claims 1 to 4, characterized in that: The outer diameter of the polyurethane (12) is less than or equal to the outer diameter of the compressed beef tendon block (11); or the distance between the outer wall of the polyurethane (12) and the inner wall of the cup body blank (4) is 0.1 mm to 3 mm.

6. The coreless water expansion mold for the thermos cup according to claim 5, characterized in that: One end of the positioning block (3) extends outward to form a step (31), and the opening of the cup body blank (4) abuts against the bottom surface of the step (31).

7. The coreless water expansion mold for a thermos cup according to claim 1, 2, 3, 4 or 6, characterized in that: A spring (15) is further provided between the lower support platform (9) and the lower mold plate (1), and a receiving cavity (93) is provided at the end of the second water hole (91). The spring (15) is installed in the receiving cavity (93). When the mold is opened, the restoring force of the spring (15) causes the lower support platform (9) to drive the lower support plate (8) to reset upward, and the lower support plate (8) drives the ejector pin (14) to pass through the lower mold head (2).

8. The coreless water expansion mold for the thermos cup according to claim 7, characterized in that: The upper mold module comprises an upper mold plate (5), a mold cavity (7), and an insert (6) installed in the mold cavity (7); an end of the insert (6) protrudes from an inner wall of the mold cavity (7); and the end of the insert (6) is arranged in an arc shape.

9. The coreless water expansion mold for the thermos cup according to claim 8, characterized in that: The bottom of the cavity (7) is provided with a first wedging surface (71) inclined outwards, and the end surface of the lower die head (2) is provided with a second wedging surface (22) wedged with the first wedging surface (71). In the mold closing state, the first wedging surface (71) and the second wedging surface (22) are tightly fitted.

10. The coreless water expansion mold for a thermos cup according to claim 1, 8 or 9, characterized in that: A sealing ring (16) is provided between the lower supporting platform (9) and the lower mold plate (1). The sealing ring (16) is arranged on the lower supporting platform (9). In the mold closing state, the sealing ring (16) abuts against the lower mold plate (1) to seal.

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