A device for forming internal thread of vacuum cup

Abstract

This utility model relates to the field of thermos cup processing technology, specifically a device for forming internal threads in thermos cups. It includes: a lower mold, composed of a multi-lobed core-pulling structure, with a spirally wound groove on the outer wall of the top region of the lower mold, and a spring fitted inside the groove, the spring having a diameter larger than the groove diameter; and an upper mold, also composed of a multi-lobed core-pulling structure, having an inner cavity with a spirally wound threaded cavity on its wall. The advantages of this utility model are: this device uses axial extrusion forming, with the threaded cavities of the upper and lower molds applying a uniform axial force to the cup wall, avoiding deformation of the cup body caused by radial stress. Extrusion forming replaces the traditional rolling process, preventing cup body deformation caused by radial force. Simultaneously, the linkage design of the multi-lobed core-pulling structure of the lower mold and the pull rod achieves uniform radial force distribution, further ensuring the geometric stability of the cup body and guaranteeing the product's aesthetics and sealing performance.

Description

Technical Field

[0001] This utility model relates to the field of thermos cup processing technology, and in particular to a device for forming internal threads in thermos cups. Background Technology

[0002] The internal thread forming of a thermos cup is one of the key processes in the cup body manufacturing. Traditional thread processing mainly adopts the roll forming method, such as the adjustable speed roll forming machine proposed in publication number CN216461470U. However, roll forming is prone to cup body deformation, affecting the product dimensional accuracy. During the roll forming process, the roller applies continuous radial pressure to the cup wall, which can easily cause ellipticity deviation or local dents in the thin-walled stainless steel cup body, affecting the sealing performance and aesthetics.

[0003] To address this issue, this utility model proposes a device for forming the internal thread of a thermos cup. Utility Model Content

[0004] The purpose of this invention is to at least solve one of the aforementioned technical defects.

[0005] Therefore, one objective of this utility model is to provide a device for forming the internal thread of a thermos cup, so as to solve the problems mentioned in the background art and overcome the shortcomings of the prior art.

[0006] To achieve the above objectives, one embodiment of this utility model provides a device for forming internal threads in a thermos cup, comprising: a lower mold, which is composed of a multi-lobed core-pulling structure, wherein the outer wall of the top region of the lower mold is provided with a spirally wound groove; an upper mold, which is also composed of a multi-lobed core-pulling structure, wherein the upper mold has an inner cavity, and the wall of the inner cavity is provided with a spirally wound threaded cavity, wherein a spring is clamped on the threaded cavity, and the diameter of the spring is larger than the diameter of the spiral cavity; a pull rod, which drives the lower mold lobes to expand or contract radially through axial movement; a push rod, which drives the upper mold lobes to expand outward, thereby enlarging the inner cavity of the upper mold to form an open mold; and a sleeve plate, which has a through hole, and is movable relative to the upper mold, and is used to close the upper mold and restrict the upper mold from expanding outward.

[0007] Preferably, according to any of the above solutions, the lower mold includes: a six-lobed split module, arranged in a circumferential array, divided into a first type of module with three identical lobes and a second type of module with three identical lobes, the first type of module having a first groove extending axially on its radially inner side, the first groove having a trapezoidal cross-section, the second type of module having a first protrusion on its radially inner side, the first type of module and the second type of module being arranged alternately; and a positioning sleeve, the inner wall of which has a conical guide surface matching the outer contour of the first type of module and the second type of module.

[0008] Preferably, in any of the above embodiments, the pull rod is a hexagonal prism structure with a gradually expanding tapered design from top to bottom. Its six sides correspond to the various segments of the lower module, including: three identical first driving surfaces, each with a second groove extending axially, the second groove forming a sliding fit with the first protrusion of the second type of module; three identical second driving surfaces, each with a second protrusion forming a sliding fit with the first groove; the first driving surfaces and the second driving surfaces are alternately distributed.

[0009] Preferably, any of the above embodiments further includes: a base frame on which a base plate is fixedly mounted; a vertical pole fixedly mounted on the base plate, with a top plate fixedly mounted on the top of the vertical pole; a first hydraulic cylinder with a sleeve rod fixedly mounted at its output end, the top rod being slidably disposed within the sleeve rod; a return spring, one end of which is fixedly mounted within the sleeve rod, and the other end of which is fixedly connected to the sleeve rod; a second hydraulic cylinder with an extension rod fixedly mounted at its output end, the extension rod being connected to the sleeve plate for driving the sleeve plate; and a third hydraulic cylinder with a cylindrical rod fixedly mounted at its output end, the cylindrical rod being connected to a pull rod.

[0010] Preferably, the upper mold comprises: six identical split first modules arranged in a circular array, the outer wall of the first module having a guide slope that mates with the through hole; and a mounting sleeve having a tapered guide surface on its inner wall that matches the outer contour of the first module.

[0011] Preferably, in any of the above embodiments, a sliding plate is slidably mounted on the upright, the sliding plate has a through hole for the top rod to move, one end of the sliding plate is fixedly connected to the sleeve rod, and the other end of the sliding plate is fixedly connected to the mounting sleeve.

[0012] Preferably, in any of the above solutions, a limiting rod is fixedly installed on the top of the sleeve plate, and the limiting rod is slidably mounted on the slide plate.

[0013] Preferably, in any of the above solutions, a limiting rod is fixedly installed on the top of the sleeve plate, and the limiting rod is slidably mounted on the slide plate.

[0014] Compared with the prior art, the advantages and beneficial effects of this utility model are as follows:

[0015] 1. This device uses axial extrusion molding. The threaded cavities of the upper and lower dies apply uniform axial force to the cup wall, avoiding cup deformation caused by radial stress. Extrusion molding replaces the traditional rolling process, avoiding cup deformation caused by radial force. At the same time, the multi-lobed core-pulling structure of the lower die and the linkage design of the pull rod achieve uniform radial force, further ensuring the geometric stability of the cup and guaranteeing the aesthetics and sealing of the product.

[0016] 2. Through dynamic spring compensation, elastic compensation is provided during the extrusion process, effectively eliminating the mold closing marks caused by the assembly of multi-lobed modules, ensuring that the thread surface is smooth and without marks, and the dimensions are accurate.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is a three-dimensional schematic diagram according to an embodiment of the present invention;

[0020] Figure 2 This is a partial cross-sectional schematic diagram according to an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the lower mold expansion according to an embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the lower mold shrinkage according to an embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram of a pull rod according to an embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram of the skateboard connection according to an embodiment of the present invention;

[0025] Figure 7 This is a schematic cross-sectional view of the sleeve rod according to an embodiment of the present invention;

[0026] Figure 8 This is a schematic diagram of a spring exploding according to an embodiment of the present invention.

[0027] In the diagram: 1. Lower mold, 101. First type of module, 102. Second type of module, 104. First protrusion, 103. Positioning sleeve, 2. Upper mold, 201. First module, 202. Mounting sleeve, 3. Pull rod, 301. Second protrusion, 4. Push rod, 5. Sleeve plate, 501. Limiting rod, 6. Spring, 7. Base plate, 8. Base plate, 9. Upright rod, 10. Top plate, 11. First hydraulic cylinder, 12. Sleeve rod, 13. Reset spring, 14. Second hydraulic cylinder, 1401. Extension rod, 15. Third hydraulic cylinder, 1501. Cylindrical rod, 16. Slide plate. Detailed Implementation

[0028] like Figures 1 to 8 As shown, a method for forming the internal thread of a thermos cup includes a lower mold 1, an upper mold 2, a pull rod 3, a push rod 4, and a sleeve plate 5.

[0029] Furthermore, the lower mold 1 is composed of a multi-lobed core-pulling structure, and the outer wall of the top area of ​​the lower mold 1 is provided with a spirally encircling groove.

[0030] Specifically, the lower mold 1 includes:

[0031] Multi-lobed modular design, arranged in a circular array, includes at least:

[0032] A plurality of first type modules 101, wherein the first type modules 101 are provided with a first groove extending along the axial direction on the radially inner side, and the cross-section of the first groove is trapezoidal;

[0033] A plurality of second-type modules 102, wherein a first protrusion 104 is provided on the radially inner side of the second-type modules 102, and the first-type modules 101 and the second-type modules 102 are arranged alternately.

[0034] The positioning sleeve 103 has a tapered guide surface on its inner wall that matches the outer contours of the first type of module 101 and the second type of module 102, which is used to limit the expansion and contraction movements of the first type of module 101 and the second type of module 102.

[0035] The number of the multi-lobed split modules is three to eight, and the number of the first type of module 101 and the second type of module 102 is equal or differs by one.

[0036] Furthermore, the upper mold 2 is assembled from a multi-lobed core-pulling structure. The upper mold 2 has an inner cavity, and a spirally wound threaded cavity is provided on the wall of the inner cavity. A spring 6 is clamped onto the threaded cavity. The diameter of the spring 6 is larger than the diameter of the spiral cavity. The spring 6 serves as a forming part for thread forming, avoiding mold marks caused by the assembly of multi-lobed modules when pressing the thread. Secondly, since the spring 6 is set in a clamping manner, it is easy to replace.

[0037] Specifically, the upper mold 2 includes:

[0038] Several split first modules 201 are arranged in a circular array, and the outer wall of the first module 201 is provided with a guide slope that cooperates with the through hole;

[0039] The mounting sleeve 202 has a tapered guide surface on its inner wall that matches the outer contour of the first module 201, which is used to limit the expansion and contraction movements of the first module 201.

[0040] Furthermore, the pull rod 3 drives each segment of the lower mold 1 to expand or contract radially through axial movement;

[0041] The pull rod 3 has several sides corresponding to the various segments of the lower module 1, and its outer contour has a gradually expanding tapered design from top to bottom, including:

[0042] Several second grooves extending axially are provided for cooperating with the first driving surface of the second type module 102, and the second grooves form a sliding fit with the first protrusion 104 of the second type module 102.

[0043] Several second driving surfaces for cooperating with the first type of module 101: provided with second protrusions 31 that form a sliding fit with the first groove;

[0044] The first driving surface and the second driving surface are alternately distributed;

[0045] The pull rod 3 has a gradually expanding tapered design from top to bottom, so as to drive the first type of module 101 and the second type of module 102 to expand or contract as they move upward or downward.

[0046] Furthermore, the push rod 4 is used to drive each segment module of the upper mold 2 to expand outward, thereby enlarging the inner cavity of the upper mold 2 to form an open mold.

[0047] The top rod 4 is provided with a conical surface that engages with the first module 201 in a conical direction.

[0048] Furthermore, the sleeve plate 5 has a through hole, the sleeve plate 5 is movable relative to the upper mold 2, and is used to close the upper mold 2 and restrict the upper mold 2 from expanding outward. A limit rod 501 is fixedly installed on the top of the sleeve plate 5.

[0049] Furthermore, it also includes:

[0050] The base frame 7 has a base plate 8 fixedly mounted on it;

[0051] A pole 9 is fixedly installed on a base plate 8, and a top plate 10 is fixedly installed on the top of the pole 9.

[0052] The first hydraulic cylinder 11 has a sleeve rod 12 fixedly installed at its output end. The push rod 4 is slidably disposed in the sleeve rod 12. The first hydraulic cylinder 11 is installed on the top plate 10.

[0053] The return spring 13 has one end fixedly installed inside the sleeve rod 12, and the other end fixedly connected to the sleeve rod 12;

[0054] The second hydraulic cylinder 14 has an extension rod 1401 fixedly installed at its output end. The extension rod 1401 is connected to the sleeve plate 5 and is used to drive the sleeve plate 5.

[0055] The third hydraulic cylinder 15 has a cylindrical rod 1501 fixedly installed at its output end. The cylindrical rod 1501 is connected to the pull rod 3. The third hydraulic cylinder 15 is installed on the base frame 7.

[0056] A sliding plate 16 is slidably mounted on the upright 9. The sliding plate 16 has a through hole for the top rod 4 to move. One end of the sliding plate 16 is fixedly connected to the sleeve rod 12, and the other end of the sliding plate 16 is fixedly connected to the mounting sleeve 202. The second hydraulic cylinder 14 is mounted on the sliding plate 16. The limiting rod 501 is slidably mounted on the sliding plate 16. The sliding plate 16 is driven by the first hydraulic cylinder 11. The upright 9 limits the movement trajectory of the sliding plate 16.

[0057] A device for forming internal threads in thermos cups, the working principle of which is as follows:

[0058] The thermos cup is placed on the outside of the lower mold 1. The cylindrical rod 1501 is driven by the third oil cylinder 15 to drive the pull rod 3 to move upward. With the cooperation of the first protrusion 104, the second protrusion 31, the first groove and the second groove, the first type of module 101 and the second type of module 102 are driven to expand, and the cup body is tensioned from the inside to the outside.

[0059] The first oil cylinder 11 drives the sleeve rod 12 to move, which in turn drives the slide plate 16 to move the upper mold 2 toward the cup body, and simultaneously drives the spring 6 to be sleeved on the thermos cup.

[0060] The extension rod 1401 driven by the second oil cylinder 14 drives the sleeve plate 5 to move upward. During the movement, the through hole on the sleeve plate 5 cooperates with the inclined surface on the first module 201, causing the first module 201 to contract inward, thereby applying a pressing force to the spring 6, and cooperating with the groove on the lower mold 1 to press the internal thread of the thermos cup.

[0061] After pressing, the mold is opened. First, the second cylinder 14 moves to reset, releasing the force applied to the first module 201 and the spring 6. Then, the first cylinder 11 moves to reset, causing the spring 6 to disengage from the cup. Finally, the third cylinder 15 moves to reset, releasing the tension on the cup.

Claims

1. A device for forming internal threads in a thermos cup, characterized in that: include: The lower mold is assembled from a multi-lobed core-pulling structure, and the outer wall of the top area of ​​the lower mold is provided with a spirally encircling groove. The upper mold is composed of a multi-lobed core-pulling structure. The upper mold has an inner cavity, and the wall of the inner cavity is provided with a spirally wound threaded cavity. A spring is installed on the threaded cavity, and the diameter of the spring is larger than the diameter of the threaded cavity. The tie rod drives the lower mold segments to expand or contract radially via axial movement. The push rod is used to drive the each segment module of the upper mold to expand outward, thereby enlarging the inner cavity of the upper mold to form an open mold. A sleeve plate having through holes is movable relative to the upper mold and is used to close the upper mold and restrict the outward expansion of the individual segments of the upper mold.

2. The device for forming internal threads of a thermos cup according to claim 1, characterized in that: The lower mold includes: Multi-lobed modular design, arranged in a circular array, includes at least: Several first-type modules have a first groove extending axially on their radially inner side, and the cross-section of the first groove is trapezoidal. Several second-type modules are provided with a first protrusion on their radially inner side, and the first-type modules and second-type modules are arranged alternately. The positioning sleeve has a tapered guide surface on its inner wall that matches the outer contours of the first type of module and the second type of module.

3. The device for forming internal threads in a thermos cup according to claim 2, characterized in that: The number of the multi-lobed split modules is three to eight, and the number of the first type of modules is equal to or differs from that of the second type of modules by one.

4. The device for forming internal threads of a thermos cup according to claim 3, characterized in that: The pull rod is provided with several side surfaces corresponding to the lower module's segments, and its outer contour has a gradually expanding tapered design from top to bottom, including: Several first driving surfaces for mating with the second type of module are provided with second grooves extending axially, and the second grooves form a sliding fit with the first protrusions of the second type of module; Several second driving surfaces for cooperating with the first type of module: provided with second protrusions that form a sliding fit with the first groove; The first driving surface and the second driving surface are alternately distributed.

5. The apparatus for forming internal threads in a thermos cup according to claim 1, characterized in that: Also includes: A base frame on which a base plate is fixedly mounted; A pole is fixedly installed on the base plate, and a top plate is fixedly installed on the top of the pole. The first hydraulic cylinder has a sleeve rod fixedly installed at its output end, and the push rod is slidably disposed inside the sleeve rod. The return spring has one end fixedly installed inside the sleeve rod, and the other end fixedly connected to the sleeve rod; The second hydraulic cylinder has an extension rod fixedly installed at its output end, and the extension rod is connected to the sleeve plate for driving the sleeve plate. The third hydraulic cylinder has a cylindrical rod fixedly installed at its output end, and the cylindrical rod is connected to the pull rod.

6. The device for forming internal threads of a thermos cup according to claim 1, characterized in that: The upper mold includes: Several separate first modules are arranged in a circular array, and the outer wall of the first module is provided with a guide slope that cooperates with the through hole; The mounting sleeve has a tapered guide surface on its inner wall that matches the outer contour of the first module.

7. The apparatus for forming internal threads in a thermos cup according to claim 5, characterized in that: A sliding plate is slidably mounted on the upright, and the sliding plate has a through hole for the top rod to move. One end of the sliding plate is fixedly connected to the sleeve rod, and the other end of the sliding plate is fixedly connected to the mounting sleeve.

8. The apparatus for forming internal threads in a thermos cup according to claim 7, characterized in that: A limit rod is fixedly installed on the top of the sleeve plate, and the limit rod is slidably mounted on the slide plate.

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