Thread rolling device for cup rim of water cup

Abstract

The utility model discloses a thread rolling device for a cup rim of a water cup. The out-of-roundness of the cup rim after thread rolling can be greatly improved. Comprising a first threaded mold arranged on the inner side of a cup rim and a second threaded mold arranged on the outer side of the cup rim, the first threaded mold and the second threaded mold can rotate synchronously, and the second threaded mold can be driven to be away from or close to the first threaded mold; the pinch roller mechanism is fixed on the telescopic driving device and at least comprises a pinch roller capable of rotating; in the rotating direction of the first thread mold, the pressing wheel is arranged behind the thread rolling position where the second thread mold is in contact with the first thread mold; and when the pressing wheel and the second threaded mold abut against and press the cup opening of the water cup, the section, located between the pressing wheel and the second threaded mold, of the cup opening of the water cup can be tightly attached to the first threaded mold.

Description

Technical Field

[0001] This utility model belongs to the technical field of equipment for water cup processing, and particularly relates to a thread rolling device for the mouth of a water cup. Background Technology

[0002] The connection between a water cup and its lid is usually a threaded connection; therefore, when processing a metal water cup, it is necessary to machine a thread at the rim of the cup.

[0003] Existing thread processing methods typically employ a rolling process. This involves placing a thread die (or thread punch) inside the cup rim, and then having the thread punch (or thread die) cooperate with the thread die (or thread punch) on the outside of the cup rim to roll and form threads on the cup rim. Examples of such methods include ZL201320419766.4, a device for rolling threads on the body of an insulated container, and ZL202120927573.4, a thread processing device for a cup body.

[0004] In the existing technology of rolling thread forming, the thin-walled cup mouth will deform and become out of round during the extrusion forming process, which will affect the screwing with the cup lid; therefore, it is necessary to improve the problem of out-of-roundness. Summary of the Invention

[0005] In order to solve the problems existing in the prior art, this utility model provides a thread rolling device for the mouth of a water cup, which can greatly improve the out-of-roundness of the mouth of the cup after thread rolling.

[0006] To achieve the above objectives, the present invention adopts the following technical solution.

[0007] A thread rolling device for the mouth of a water cup includes a first thread die disposed inside the mouth of the water cup and a second thread die disposed outside the mouth of the water cup, which can rotate synchronously, and the second thread die can be driven away from or close to the first thread die; it also includes a pressure roller mechanism fixed on a telescopic drive device, which includes at least a pressure roller capable of rotation; in the rotation direction of the first thread die, the pressure roller is disposed behind the thread rolling position where the second thread die contacts the first thread die; and when both the pressure roller and the second thread die are pressed against the mouth of the water cup, the section of the mouth of the water cup located between the pressure roller and the second thread die can be pressed tightly against the first thread die.

[0008] Compared with the prior art, the beneficial effects of this utility model are as follows: By adopting the above technical solution and setting a pressure roller mechanism, the pressure roller can be pressed against the mouth of the cup. Moreover, the pressure roller is located behind the thread rolling position where the second thread die and the first thread die are in contact. That is, the section of the mouth of the cup located between the pressure roller and the second thread die is the section to be threaded. The two ends of this section can be pressed tightly against the first thread die by the pressure roller and the first thread die, eliminating the gap and greatly improving the out-of-roundness of the mouth of the cup after thread rolling.

[0009] Preferably, when both the pressure roller and the second threaded die are pressed against the mouth of the cup, the angle between the center line connecting the pressure roller and the center line connecting the center of the second threaded die and the center line connecting the first threaded die does not exceed 90°.

[0010] Using the above technical solution, after testing, the angle between the center line connecting the pressure roller and the center line connecting the second threaded die and the center line connecting the first threaded die is 90°. This is the maximum angle at which the mouth of the water cup is in close contact with the first threaded die in the section between the pressure roller and the second threaded die. After the angle exceeds 90 degrees, the force applied in the obtuse angle direction can easily cause the mouth of the thin-walled water cup to arch, which does not help to eliminate the gap.

[0011] Preferably, when the pressure roller and the second threaded die are both pressed against the mouth of the cup, the angle between the center line connecting the pressure roller and the center line connecting the center of the second threaded die and the center line connecting the first threaded die is 90°.

[0012] Using the above technical solution, after testing, 90° is the optimal angle for the section of the cup mouth between the pressure roller and the second threaded die to be close to the first threaded die. This ensures that the gap is eliminated while the section of the cup mouth between the pressure roller and the second threaded die is long enough, and the second threaded die and the pressure roller will not interfere with each other.

[0013] Preferably, the pressure roller mechanism further includes at least a cantilever, a spring arm, and an elastic mechanism; the pressure roller is rotatably mounted on the spring arm; the spring arm is telescopically mounted on the cantilever via the elastic mechanism; the elastic mechanism has an elastic force that causes the pressure roller to press against the first thread die; the cantilever is fixedly connected to the telescopic drive device.

[0014] By adopting the above technical solution and through the above settings, the elastic mechanism can apply force to make the pressure roller press tightly against the cup mouth. Because of its elasticity, it can ensure that the pressure roller always keeps the cup mouth pressed tightly against the first threaded die.

[0015] Preferably, the elastic mechanism includes at least a movable bolt and a first spring; the movable bolt has a partially threaded structure, with the thread at one end passing through the movable hole at one end of the cantilever and being screwed and fixed to the spring arm, and the head at the other end contacting and limiting the movement of the cantilever; the first spring is sleeved on the movable bolt and located between the cantilever and the spring arm.

[0016] By adopting the above technical solution and through the above settings, the spring arm can be elastically connected to the cantilever. During operation, the first spring can provide elastic force to the spring arm, ensuring that the pressure roller always keeps the cup mouth tightly pressed against the first threaded die. Moreover, by turning the movable bolt in and out of the spring arm, the elastic force of the first spring on the spring arm can be adjusted.

[0017] Preferably, the elastic structure includes a movable bolt, a first spring, a second spring, a baffle, and a fixed bolt; both the movable bolt and the fixed bolt are partially threaded; the thread at one end of the movable bolt passes through the baffle and the cantilever in sequence and is screwed and fixed to the spring arm, while the head at the other end abuts against the baffle for limitation; the thread at one end of the fixed bolt passes through the baffle and is screwed and fixed to the cantilever, while the head at the other end abuts against the baffle for limitation; and two fixed bolts are symmetrically arranged on both sides of the movable bolt; the first spring is sleeved on the movable bolt and located between the cantilever and the spring arm; the second spring is sleeved on the movable bolt and located between the cantilever and the baffle.

[0018] By adopting the above technical solution, with two fixed bolts symmetrically distributed on both sides of the movable bolt, and a second thread provided between the baffle and the cantilever, the movement of the spring arm will be more stable and will not be skewed; and the elastic force of the first spring on the spring arm can be adjusted by simply adjusting the fixed bolts; the second spring is used to apply elastic force to the baffle and can also indirectly help to enhance the elastic force on the spring arm. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0020] Figure 2 This is a three-dimensional exploded view of the pressure roller mechanism.

[0021] Figure 3 This is a cross-sectional structural diagram of the pressure roller mechanism.

[0022] Figure 4 This is a schematic diagram showing the rotation directions of the pressure roller, the first thread die, and the second thread die. Detailed Implementation

[0023] To make the technical solution of this utility model clearer, the following description is in conjunction with the appendix. Figures 1 to 3 This specification provides a detailed description of the present invention. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the scope of protection of the present invention.

[0024] This utility model is a thread rolling device for the rim of a water cup, including a first thread die 1 and a second thread die 2 respectively connected to their respective rotating shaft mechanisms (not shown in the figure), which can rotate synchronously; the first thread die 1 is located on the inner side of the rim, and the second thread die 2 is located on the outer side of the rim, and the second thread die 2 can move away from or close to the first thread die 1; the first thread die 1 and the second thread die 2 are mutually cooperating convex and concave dies, when the first thread die 1 is a convex die, the second thread die 2 is a concave die, and rolling can form an external thread; when the first thread die 1 is a concave die, the second thread die 2 is a convex die, and rolling can form an internal thread; a pressure roller mechanism 3 is also provided, which in this embodiment is set to move forward and backward synchronously with the second thread die 2, that is, synchronously move away from or close to the first thread die 1 with the second thread die 2 (of course, it can also be set as an independent telescopic drive mechanism, such as the pressure roller mechanism 3 using a cylinder to move forward and backward, etc.); the pressure roller mechanism 3 includes at least a pressure roller 31, which presses against the rim of the cup during operation and can rotate under the drive of the rim of the water cup.

[0025] Usage steps: First, invert the cup with the rim facing down and place the first threaded die 1 inside the rim. Then, tighten the cup up and down to the limit position, and you can start the device. At this time, the rotating shaft mechanism connected to the first threaded die 1 will start to rotate, and the rotating shaft mechanism connected to the second threaded die 2 will also rotate synchronously. Then, the second threaded die 2 and the pressure roller will move towards the rim of the cup synchronously until they touch the rim. After touching the rim, the second threaded die 2 and the pressure roller will continue to feed, with the pressure roller pressing against the rim of the cup. The first threaded die 2 and the first threaded die 1 will cooperate to roll and form threads at the rim of the cup.

[0026] Operating principle: Due to the gap between the first threaded die 1 and the inner wall of the cup opening, after the second threaded die 2 comes into contact with the cup opening, the cup opening will be offset under the force of the second threaded die 2 and will no longer be concentric with the first threaded die 1 (i.e., the phenomenon of deviation). At this time, the cup opening is only in close contact with the first threaded die 1 at the contact point between the first threaded die 1 and the second threaded die 2, and there are gaps in other parts. This is the reason why the existing technology has the problem of out-of-roundness after rolling. In this embodiment, after setting the pressure roller, the pressure roller is used to press the cup opening, and the cup opening section between the pressure roller and the second threaded die 2 is the section that will be rolled. After the pressure roller and the second threaded die 2 press against this section simultaneously, it can be made to fit tightly against the first threaded die 1 and eliminate the gap. Therefore, it can greatly improve the occurrence of out-of-roundness of rolled threads.

[0027] Taking the machining of internal threads as an example, if the inner diameter of the internal thread is required to be about 85mm, the out-of-roundness of the thread processed by the existing technology is usually around 1.2mm, while the thread processed by the device in this embodiment, after measurement, has an out-of-roundness of only about 0.2mm, which greatly improves the out-of-roundness.

[0028] Preferably, the pressure roller mechanism 3 is further provided with at least a cantilever 32, a spring arm 33, and an elastic mechanism; wherein the pressure roller 31 is rotatably mounted on the spring arm 33, and the spring arm 33 is telescopically mounted on the cantilever 32 through the elastic mechanism; and the cantilever 32 is fixed to the telescopic drive device of the rotating shaft mechanism connected to the second threaded die 2 through the connecting plate 34, so as to facilitate synchronous advance and retreat with the second threaded die 2; when the pressure roller 31 contacts the cup mouth, the elastic mechanism can apply force to make the pressure roller 31 press tightly against the cup mouth, and because it is elastic, it can ensure that the pressure roller 31 always keeps pressing the cup mouth tightly against the first threaded die 1.

[0029] In one embodiment, the elastic mechanism includes at least a movable bolt 35 and a first spring 36; wherein the movable bolt 35 has a partially threaded structure, with a head and a thread at each end; the thread at one end of the movable bolt 35 passes through the movable hole 321 at one end of the cantilever 32 and is screwed and fixed to the spring arm 33, and the head at the other end abuts against and limits the movement of the cantilever 32; the first spring 36 is sleeved on the movable bolt 35 and is located between the cantilever 32 and the spring arm 33; the elastic force of the first spring 36 on the spring arm 33 can be adjusted by screwing the movable bolt 35 in and out of the spring arm 33; by setting the structure, the spring arm 33 can be elastically and movably connected to the cantilever 32, and during operation, the first spring 36 can provide elastic force to the spring arm 33 to ensure that the pressure roller 31 always keeps the cup mouth tightly pressed against the first threaded mold 1.

[0030] In another embodiment, the elastic structure includes a movable bolt 35, a first spring 36, a second spring 37, a baffle 38, and a fixed bolt 39; wherein both the movable bolt 35 and the fixed bolt 39 are partially threaded, with a head and a thread at each end; the movable bolt 35 passes through a movable hole 321 at one end of the cantilever 32, and the thread at one end is screwed and fixed to the spring arm 33, while the head at the other end abuts against and limits the movement of the baffle 38; and the first spring 36 is sleeved on the movable bolt 35 and located between the cantilever 32 and the spring arm 33, while the second spring 37 is sleeved on the movable bolt 35. It is positioned between the cantilever 32 and the baffle 38; one end of the fixing bolt 39 is threaded and fixed to the cantilever 32, and the head of the other end abuts against the baffle 38 for limitation; and the fixing bolt 39 is arranged as two symmetrically on both sides of the movable bolt 35; compared with the previous embodiment, the movement of the spring arm 33 is more stable and will not be skewed; and only the fixing bolt 39 needs to be adjusted to adjust the elastic force of the first spring 36 on the spring arm 33; in this embodiment, the second spring 37 is used to apply elastic force to the baffle 38 and indirectly affects the elastic force on the spring arm 33.

[0031] It should be noted that, according to the operating principle of the device, the contact position between the second thread die 2 and the first thread die 1 is the thread rolling position. In the rotation direction of the first thread die 1, the pressure roller 31 is located behind the thread rolling position. Moreover, the angle between the center line connecting the pressure roller 31 and the center line connecting the second thread die 2 and the center line connecting the first thread die 1 should not exceed 90 degrees, and 90 degrees is preferred as the best solution.

Claims

1. A thread rolling device for the mouth of a water cup, comprising a first threading die (1) disposed on the inner side of the mouth of the water cup and a second threading die (2) disposed on the outer side of the mouth of the water cup, and capable of rotating synchronously, wherein the second threading die (2) can be driven away from or towards the first threading die (1); characterized in that: It also includes a pressure wheel mechanism (3) fixed on the telescopic drive device, including at least a pressure wheel (31) that can rotate on its own. In the rotation direction of the first thread die (1), the pressure roller (31) is located behind the thread rolling position where the second thread die (2) contacts the first thread die (1); When the pressure roller (31) and the second threaded die (2) are pressed against the mouth of the water cup, the section of the mouth of the water cup located between the pressure roller (31) and the second threaded die (2) can be pressed against the first threaded die (1).

2. The thread rolling device for the mouth of a water cup according to claim 1, characterized in that: When the pressure roller (31) and the second threaded die (2) are both pressed against the mouth of the cup, the angle between the center line connecting the pressure roller (31) and the center line connecting the second threaded die (2) and the center line connecting the first threaded die (1) does not exceed 90°.

3. The thread rolling device for the mouth of a water cup according to claim 1, characterized in that: When the pressure roller (31) and the second threaded die (2) are both pressed against the mouth of the cup, the angle between the center line connecting the pressure roller (31) and the center line connecting the second threaded die (2) and the center line connecting the first threaded die (1) is 90°.

4. The thread rolling device for the mouth of a water cup according to claim 1, characterized in that: The pressure roller mechanism (3) also includes at least a cantilever (32), a spring arm (33), and an elastic mechanism; The pressure roller (31) is rotatably mounted on the spring arm (33); The elastic arm (33) is telescopically mounted on the cantilever (32) via an elastic mechanism; The elastic mechanism has an elastic force that causes the pressure roller (31) to press against the first thread die (1); The cantilever (32) is fixedly connected to the telescopic drive device.

5. A thread rolling device for the mouth of a water cup according to claim 4, characterized in that: The elastic mechanism includes at least a movable bolt (35) and a first spring (36); The movable bolt (35) has a partially threaded structure. The thread at one end passes through the movable hole (321) at one end of the cantilever (32) and is screwed to the spring arm (33) for fixation. The head at the other end abuts against the cantilever (32) for limiting. The first spring (36) is sleeved on the movable bolt (35) and located between the cantilever (32) and the spring arm (33).

6. A thread rolling device for the mouth of a water cup according to claim 4, characterized in that: The elastic structure includes a movable bolt (35), a first spring (36), a second spring (37), a baffle (38), and a fixed bolt (39); Both the movable bolt (35) and the fixed bolt (39) have partially threaded structures; The thread of one end of the movable bolt (35) passes through the baffle (38) and the cantilever (32) in sequence and is screwed to the spring arm (33) for fixation. The head of the other end abuts against the baffle (38) for limitation. The thread of one end of the fixing bolt (39) passes through the baffle (38) and is screwed to the cantilever (32), while the head of the other end abuts against the baffle (38) for limitation; and the fixing bolt (39) is set as two symmetrically arranged on both sides of the movable bolt (35); The first spring (36) is sleeved on the movable bolt (35) and located between the cantilever (32) and the spring arm (33); The second spring (37) is sleeved on the movable bolt (35) and located between the cantilever (32) and the baffle (38).

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