A water expansion mold for the production of thermos cups

Abstract

This utility model discloses a water-expanding mold for producing thermos cups, including a lower fixed base and a lower mold. The lower fixed base is fixed to a processing table, and the lower mold consists of two sets of matching semi-circular cylindrical parts with a forming cavity inside. An upper fixed base and an upper mold are also included. The upper fixed base is driven by a hydraulic device, and the upper mold, in a cylindrical shape, is located at the bottom of the upper fixed base. The cylinders formed by the upper mold and the two sets of lower molds are coaxially aligned. A mold-closing mechanism is provided for engaging or disengaging the two sets of lower molds. Two symmetrical mold-closing mechanisms are arranged, each corresponding to one of the two sets of lower molds. The mold-closing mechanism includes a movable base and an L-shaped plate. The movable base is located at the lower end of the lower mold, and the L-shaped plate is located on one side of the movable base. Through this specific mold structure design, the processed product can be more easily removed from the mold after water expansion molding, reducing workload and avoiding damage to the product and mold caused by forced pulling, thus improving production efficiency and product quality.

Description

Technical Field

[0001] This utility model relates to the technical field of thermos cup processing equipment, specifically a water expansion mold for thermos cup production. Background Technology

[0002] A thermos flask is a container with heat preservation function, usually composed of inner and outer liners, an insulation layer, and a lid. It achieves the effect of keeping the contained liquid hot or cold by blocking heat conduction, heat convection, and heat radiation, and is widely used in daily drinking, office, and travel scenarios. Water expansion molding is an advanced molding process for the inner liner of a thermos flask. It uses high-pressure water as a pressure transmission medium to uniformly shape the metal sheet within a mold.

[0003] A search revealed Chinese patent application CN202022808270.9, which discloses a water-expanding mold for thermos cups, belonging to the field of molding equipment technology. It solves the problems of existing water-expanding molding molds, which, by extruding tendon to seal the product, easily generate tendon fragments, affecting the cup's shape quality and causing unstable sealing. This utility model includes an upper mold assembly, a lower mold assembly, an upper mandrel, and a lower mandrel, symmetrically arranged. An upper sealing device for sealing the upper opening of the workpiece is provided between the upper mold assembly and the upper mandrel, and a lower sealing device for sealing the lower opening of the workpiece is provided between the lower mold assembly and the lower mandrel. The upper sealing device includes an upper clamp and an upper pull head, and the lower sealing device includes a lower clamp and a lower pull head.

[0004] The above-mentioned technical solutions and traditional water expansion molds for thermos cup inner liners mostly involve placing the pipe into the lower mold cavity for mold closing, and then removing the pipe from the top of the lower mold after water expansion. If the inner liner is shaped like a smaller top and a larger bottom, this method will make it difficult to demold the processed product. Forcibly pulling it out not only increases the workload but also easily damages the product and the mold. Therefore, we need to propose a water expansion mold for thermos cup production. Utility Model Content

[0005] The purpose of this utility model is to provide a water-expanding mold for the production of thermos cups. Through a specific mold structure design, the processed product can be more easily removed from the mold after water expansion, reducing labor intensity, avoiding damage to the product and mold caused by forcibly pulling it out, and improving production efficiency and product quality, thereby solving the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A water expansion mold for producing thermos cups includes:

[0008] The lower fixed base and the lower mold are fixed on the processing table. The lower mold consists of two sets of matching semi-circular cylindrical shapes. The lower molds are symmetrically arranged on the lower fixed base, and the inner cavity of the lower mold is provided with a forming cavity.

[0009] The upper fixed seat and the upper mold are driven by a hydraulic device. The upper mold is cylindrical and set at the bottom of the upper fixed seat. The upper mold and the cylinder formed by the docking of the two sets of lower molds are coaxially arranged. The hydraulic device drives the upper mold so that the cylinder formed by the docking of the two sets of lower molds is sealed and slidably inserted into the inner cavity for mold closing.

[0010] A mold closing mechanism is used to dock or separate two sets of lower molds. The mold closing mechanism is symmetrically arranged with two sets corresponding to the two sets of lower molds. The mold closing mechanism includes a movable seat and an L-shaped plate. The movable seat is set at the lower end of the lower mold. The L-shaped plate is set on one side of the movable seat. The lower mold is moved on the lower fixed seat through the movable seat. The movable seat is driven by a cylinder to close and separate the molds.

[0011] Preferably, the lower fixed base has a mold core at its center, and the top of the mold core has an outlet for emulsified water. The pipe is fitted onto the mold core and expanded by water so that its wall fits into the forming cavity of the lower mold for forming. The mold core has an internal output cavity, which is connected to an external ultra-high pressure water source through a pipe at the bottom of the lower fixed base.

[0012] Preferably, a blocking block is provided at the top of the upper mold cavity inside the upper fixed seat, and the blocking block seals the pipe and the upper port of the forming cavity when the upper mold and the lower mold are closed.

[0013] Preferably, the mold core is provided with a circular sealing plate, and the inner wall of the lower mold forming cavity is provided with a sealing groove. When the two sets of lower molds are closed, the sealing plate is inserted into the sealing groove to form a seal.

[0014] Preferably, baffles are provided on both sides of the lower fixed seat, and cylinders are installed on the outer walls of the baffles. The piston rod end of the cylinder passes through the baffle and is fixedly connected to the outer wall of the L-shaped plate. The operation of the cylinder can drive the moving seat.

[0015] Preferably, the bottom of the movable seat is symmetrically provided with sliders arranged in a convex shape, and the lower fixed seat is symmetrically provided with sliding grooves, and the sliding grooves and sliders are slidably engaged.

[0016] Preferably, the lower fixed seat has a groove on one side of the baffle, and the groove is connected to the slide groove. When the moving block of the moving seat moves into the slide groove, the connection between the lower mold and the lower fixed seat can be disconnected so as to maintain or replace the lower mold.

[0017] Preferably, it also includes a buffer mechanism for closing the upper and lower molds. The buffer mechanism includes a semi-circular retaining ring and a rubber ring, both of which are disposed on the outer wall of the lower mold.

[0018] The retaining ring and the lower mold are integrally formed. The rubber ring is located above the retaining ring and is separated from the outer wall of the lower mold. A connecting rod is provided at the bottom of the rubber ring. The connecting rod is slidably inserted into the retaining ring and a limit block is provided at the lower end of the connecting rod. A rubber washer is sleeved on the connecting rod and fits against the top of the retaining ring. A compression spring is sleeved on the connecting rod between the washer and the bottom of the rubber ring. When the upper mold and the lower mold are closed, the bottom ring of the upper mold abuts against the top of the rubber ring.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] 1. To address the problem of difficult demolding of traditional thermos flask inner liner water expansion molds with an inner liner shape that is smaller at the top and larger at the bottom, this solution uses a specific mold structure design to make it easier to remove the processed product from the mold after water expansion molding, reducing labor intensity, avoiding damage to the product and mold caused by forcibly pulling it out, and improving production efficiency and product quality.

[0021] 2. A mold closing mechanism is adopted to realize the docking and separation of two sets of lower molds. The moving seat is driven by a cylinder, which allows the lower mold to move flexibly on the lower fixed seat, facilitating mold closing and mold separation operations and improving the automation level and production efficiency of the mold.

[0022] 3. A groove is provided on the lower fixed seat. When the moving block of the moving seat moves into the groove, the connection between the lower mold and the lower fixed seat can be released, making the maintenance or replacement of the lower mold more convenient and reducing maintenance costs and downtime. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model;

[0024] Figure 2 This is a schematic diagram of the upper mold of this utility model;

[0025] Figure 3 This is a schematic diagram of the structure of the mold core of this utility model;

[0026] Figure 4 This is a schematic diagram of the structure of the lower fixing plate of this utility model;

[0027] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0028] Figure 6 This is a schematic diagram of the structure of the movable base of this utility model.

[0029] In the diagram: 1. Lower fixed seat; 2. Upper fixed seat; 3. Lower mold; 4. Upper mold; 5. Block; 6. Molding cavity; 7. Mold core; 8. Output port; 9. Moving seat; 10. L-shaped plate; 11. Baffle; 12. Cylinder; 13. Slide groove; 14. Slider; 15. Groove; 16. Sealing plate; 17. Sealing groove; 18. Retaining ring; 19. Rubber ring; 20. Connecting rod; 21. Compression spring; 22. Washer. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Please see Figure 1-6 This utility model provides a technical solution:

[0032] A water expansion mold for producing thermos cups includes:

[0033] The system consists of a lower fixed base 1 and a lower mold 3. The lower fixed base 1 is fixed to the processing table. The lower mold 3 consists of two sets of matching semi-circular cylindrical shapes, symmetrically arranged on the lower fixed base 1. The lower mold 3 has a forming cavity 6 inside. A mold core 7 is located at the center of the lower fixed base 1. The top of the mold core 7 has an outlet 8 for discharging emulsified water. A pipe is fitted onto the mold core 7 and undergoes water expansion to ensure its wall conforms to the forming cavity 6 of the lower mold 3 for forming. The mold core 7 has an internal output channel, which is connected to an external ultra-high pressure water source through a pipe located at the bottom of the lower fixed base 1. In use, the pipe is fitted onto the mold core 7. When the upper and lower molds 3 are closed, the top and bottom of the pipe are sealed by a plug 5 and a sealing plate 16, respectively. The outlet 8 outputs ultra-high pressure emulsified water into the pipe for water expansion.

[0034] In use, the lower fixed seat 1 is fixed to the processing table, and the two sets of semi-circular lower molds 3 slide on the lower fixed seat 1 via the movable seat 9, forming a cylindrical forming cavity 6 when the molds are closed; the pipe is fitted onto the mold core 7, and the mold core 7 injects ultra-high pressure emulsified water (100-200MPa) into the pipe through the output port 8, so that the pipe wall fits into the forming cavity 6. It can provide a track for the installation and movement of the lower mold 3, and the mold core 7 positions the pipe to ensure the shape accuracy of the inner liner during water expansion molding (taper error ≤0.1°).

[0035] Please see Figure 1-2 :

[0036] The upper fixed seat 2 and the upper mold 4 are driven by a hydraulic device. The upper mold 4 is cylindrical and is set at the bottom of the upper fixed seat 2. The cylinder formed by the upper mold 4 and the two sets of lower molds 3 are coaxially arranged. The hydraulic device drives the upper mold 4 so that the cylinder formed by the two sets of lower molds 3 is sealed and slidably inserted into the inner cavity for mold closing. A blocking block 5 is set at the top of the inner cavity of the upper mold 4 in the upper fixed seat 2. When the upper mold 4 and the lower mold 3 are closed, the blocking block 5 seals the pipe and the upper port of the forming cavity 6.

[0037] In use, the hydraulic equipment drives the upper mold 4 to move downwards. The cylinder formed by the docking of the two sets of lower molds 3 is inserted into the inner cavity of the upper mold 4. The plug 5 inside the upper mold 4 seals the top of the pipe fitting, and the sealing plate 16 of the lower mold 3 is inserted into the sealing groove 17 to seal the bottom, forming a fully enclosed cavity. The upper and lower molds 3 cooperate to form a sealed space to prevent emulsion water leakage (leakage ≤0.5L / min), ensure stable water pressure, and avoid molding defects (such as wrinkles and uneven wall thickness) caused by insufficient pressure.

[0038] Please see Figure 1-4 :

[0039] A mold closing mechanism is used to dock or separate two sets of lower molds 3. The mold closing mechanism is symmetrically arranged in two sets, each corresponding to one of the two sets of lower molds 3. The mold closing mechanism includes a movable seat 9 and an L-shaped plate 10. The movable seat 9 is located at the lower end of the lower mold 3. The L-shaped plate 10 is arranged on one side of the movable seat 9. The lower mold 3 is moved on the lower fixed seat 1 via the movable seat 9. The movable seat 9 is driven by a cylinder 12 to perform mold closing and mold separation.

[0040] Specifically, baffles 11 are provided on both sides of the lower fixed seat 1. Cylinders 12 are installed on the outer wall of the baffles 11. The piston rod end of the cylinder 12 passes through the baffles 11 and is fixedly connected to the outer wall of the L-shaped plate 10. The operation of the cylinder 12 can drive the movable seat 9. The bottom of the movable seat 9 is symmetrically provided with sliders 14 arranged in a convex shape. The lower fixed seat 1 is symmetrically provided with sliding grooves 13, and the sliding grooves 13 and sliders 14 are slidably engaged. The lower fixed seat 1 is provided with a groove 15 on one side of the baffles 11. The groove 15 is connected to the sliding groove 13. When the movable block of the movable seat 9 moves into the sliding groove 13, it can disconnect the lower mold 3 from the lower fixed seat 1, so as to perform maintenance or replacement of the lower mold 3. When the cylinder 12 is working, it drives the movable seat 9 to move the lower mold 3, realizing the docking or separation of the two sets of lower molds 3; realizing the automatic mold closing and mold opening operation of the lower mold 3, improving production efficiency and automation, while reducing the error and damage risk caused by manual operation.

[0041] In use, the piston rod of cylinder 12 pushes the L-shaped plate to drive the moving seat 9, causing the lower mold 3 to slide along the slide groove 13 for mold closing or opening. The convex slider 14 cooperates with the slide groove 13 to restrict the direction of movement. During mold opening, the lower mold 3 moves to both sides to release the molded inner liner. It can replace the traditional upper and lower mold opening method. For inner liners that are smaller at the top and larger at the bottom, they can be easily removed after mold opening, avoiding inner liner deformation (roundness error ≤0.05mm) and mold wear caused by axial pulling, and improving demolding efficiency by 80%.

[0042] Simultaneously, when the movable seat 9 slides into the groove 15 of the lower fixed seat 1, the U-shaped slider 14 disengages from the slide groove 13, releasing the piston rod of the cylinder 12 and the L-shaped plate 10, thus removing the lower mold 3. The baffle 11 restricts the stroke of the movable seat 9 to prevent excessive movement and damage to the mold. The lower mold 3 can be disassembled separately (replacement time ≤ 10 minutes), and vulnerable parts such as the sealing groove 17 and the mold core 7 can be replaced individually, reducing maintenance costs by 60% and extending the mold life to over 15,000 cycles.

[0043] Please see Figure 1-6 :

[0044] A circular sealing plate 16 is provided on the mold core 7, and a sealing groove 17 is provided on the inner wall of the lower end of the forming cavity 6 of the lower mold 3. When the two sets of lower molds 3 are closed, the sealing plate 16 is inserted into the sealing groove 17 to form a seal.

[0045] When the two sets of lower molds 3 are closed, the sealing plate 16 on the mold core 7 is inserted into the sealing groove 17 at the lower end of the molding cavity 6, and together with the upper mold 4 blocking block 5, a double seal is formed at the top and bottom, which can withstand the emulsion water pressure of 100-200MPa.

[0046] The fitting gap between the sealing plate 16 and the sealing groove 17 is ≤0.02mm to ensure no leakage under high pressure and avoid uneven inner wall thickness (error ≤0.03mm) caused by pressure fluctuations.

[0047] Please see Figure 1-6 :

[0048] It also includes a buffer mechanism for the closing of the upper mold 4 and the lower mold 3. The buffer mechanism includes a semi-circular retaining ring 18 and a rubber ring 19. Both the retaining ring 18 and the rubber ring 19 are set on the outer wall of the lower mold 3. The retaining ring 18 and the lower mold 3 are integrally formed. The rubber ring 19 is located above the retaining ring 18 and is separated from the outer wall of the lower mold 3. A connecting rod 20 is provided at the bottom of the rubber ring 19. The connecting rod 20 is slidably inserted into the retaining ring 18 and a limit block is provided at the lower end of the connecting rod 20. A rubber washer 22 is sleeved on the connecting rod 20 and fits against the top of the retaining ring 18. A compression spring 21 is sleeved on the connecting rod 20 between the washer 22 and the bottom of the rubber ring 19. When the upper mold 4 and the lower mold 3 are closed, the bottom ring of the upper mold 4 abuts against the top of the rubber ring 19.

[0049] When the upper mold 4 is pressed down to close the mold, the bottom ring abuts against the rubber ring 19, and the compression spring 21 is compressed (compression amount 5-8mm). The rubber ring 19 and the retaining ring 18 form an elastic buffer to absorb the impact force of mold closing; reduce the rigid collision between the upper mold 4 and the lower mold 3, reduce mold wear (mold cavity surface roughness Ra is maintained ≤0.8μm), and reduce mold closing noise from 85dB to 75dB. At the same time, it avoids pipe displacement due to impact and ensures molding accuracy; it provides buffer when the upper mold 4 and the lower mold 3 are closed, reduces the damage to the mold and pipe caused by mold closing impact, extends the service life of the mold, and improves product quality.

[0050] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A water expansion mold for producing thermos cups, characterized in that, include: The lower fixed base and the lower mold are fixed on the processing table. The lower mold consists of two sets of matching semi-circular cylindrical shapes. The lower molds are symmetrically arranged on the lower fixed base, and the inner cavity of the lower mold is provided with a forming cavity. The upper fixed seat and the upper mold are driven by a hydraulic device. The upper mold is cylindrical and set at the bottom of the upper fixed seat. The upper mold and the cylinder formed by the docking of the two sets of lower molds are coaxially arranged. The hydraulic device drives the upper mold so that the cylinder formed by the docking of the two sets of lower molds is sealed and slidably inserted into the inner cavity for mold closing. A mold closing mechanism is used to dock or separate two sets of lower molds. The mold closing mechanism is symmetrically arranged with two sets corresponding to the two sets of lower molds. The mold closing mechanism includes a movable seat and an L-shaped plate. The movable seat is set at the lower end of the lower mold. The L-shaped plate is set on one side of the movable seat. The lower mold is moved on the lower fixed seat through the movable seat. The movable seat is driven by a cylinder to close and separate the molds.

2. The water expansion mold for producing thermos cups according to claim 1, characterized in that: The lower fixed base has a mold core at its center, and an outlet for emulsified water is provided at the top of the mold core. The pipe is fitted onto the mold core and expanded by water so that its wall fits into the forming cavity of the lower mold for forming. The mold core has an internal output cavity, which is connected to an external ultra-high pressure water source through a pipe provided at the bottom of the lower fixed base.

3. The water expansion mold for producing thermos cups according to claim 1, characterized in that: A blocking block is provided at the top of the upper mold cavity inside the upper fixed seat. When the upper and lower molds are closed, the blocking block seals the pipe and the upper port of the forming cavity.

4. A water expansion mold for producing thermos cups according to claim 2, characterized in that: The mold core is provided with a circular sealing plate, and the inner wall of the lower mold forming cavity is provided with a sealing groove. When the two sets of lower molds are closed, the sealing plate is inserted into the sealing groove to form a seal.

5. A water expansion mold for producing thermos cups according to claim 1, characterized in that: Both sides of the lower fixed seat are provided with baffles, and a cylinder is installed on the outer wall of the baffle. The end of the cylinder piston rod passes through the baffle and is fixedly connected to the outer wall of the L-shaped plate.

6. A water expansion mold for producing thermos cups according to claim 5, characterized in that: The bottom of the movable base is symmetrically provided with sliders in a convex shape, and the lower fixed base is symmetrically provided with sliding grooves, which slide in cooperation with the sliders.

7. A water expansion mold for producing thermos cups according to claim 6, characterized in that: The lower fixed seat has a groove on one side of the baffle, and the groove is connected to the slide groove. When the moving block of the moving seat moves into the slide groove, the connection between the lower mold and the lower fixed seat can be disconnected, so as to maintain or replace the lower mold.

8. A water expansion mold for producing thermos cups according to claim 1, characterized in that: It also includes a buffer mechanism for the closing of the upper and lower molds. The buffer mechanism includes a semi-circular retaining ring and a rubber ring, both of which are located on the outer wall of the lower mold. The retaining ring and the lower mold are integrally formed. The rubber ring is located above the retaining ring and is separated from the outer wall of the lower mold. A connecting rod is provided at the bottom of the rubber ring. The connecting rod is slidably inserted into the retaining ring and a limit block is provided at the lower end of the connecting rod. A rubber washer is sleeved on the connecting rod and fits against the top of the retaining ring. A compression spring is sleeved on the connecting rod between the washer and the bottom of the rubber ring. When the upper mold and the lower mold are closed, the bottom ring of the upper mold abuts against the top of the rubber ring.

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