Automatic lipstick tube screwing equipment capable of preventing excessive screwing

Abstract

The utility model relates to the technical field of lipstick tube assembling equipment, in particular to lipstick tube automatic screwing equipment capable of preventing excessive screwing. According to the technical scheme, the device comprises a supporting base and an installation support installed on the upper surface of the supporting base and further comprises a driving mechanism, an installation plate and a guide plate, and the installation plate and the guide plate are installed at the top and the bottom of the installation support; the positioning mechanism comprises an electric push rod mounted on the upper surface of the mounting plate, the output end of the electric push rod penetrates through the mounting plate and the guide plate and is connected with a first connecting plate, clamping mechanisms are arranged at the two ends of the first connecting plate, and an excessive screwing prevention mechanism is arranged between the guide plate and the mounting plate. The excessive screwing prevention mechanism comprises a driving shaft and a connecting shaft which are connected with the driving mechanism and the clamping mechanism, and the driving shaft and the connecting shaft are connected through an adapter ring. The lipstick tube screwing device achieves full automation of lipstick tube screwing and has the advantages of being accurate in positioning, stable in clamping, capable of preventing excessive screwing and high in automation degree.

Description

Technical Field

[0001] This utility model relates to the technical field of lipstick tube assembly equipment, and in particular to an automatic lipstick tube screw-on device that prevents over-tightening. Background Technology

[0002] In the industrial production process of lipstick, the final crucial step is to screw the inner tube containing the lipstick to the threaded outer tube base. The precision and reliability of this process directly determine whether the finished lipstick can be smoothly pushed out and retracted, whether the seal is good, and whether the appearance is clean and undamaged. As the market's demands for cosmetic quality and production efficiency continue to rise, achieving high-precision, high-efficiency, and high-consistency automated operation in this assembly stage has become an urgent need for the industry's development.

[0003] Existing automated spin-fitting equipment typically uses an electric motor as the power source, transmitting rotational motion to a clamping component at the end via gears, synchronous belts, or other transmission mechanisms. The clamping component grips the inner tube of the lipstick tube and rotates it under the drive of the motor. Simultaneously, the equipment integrates a linear feed device, usually driven by a cylinder or servo motor, which allows the rotating clamping component to move slowly and steadily along the axial direction, gradually screwing the inner tube thread into the outer tube base thread until the preset assembly depth or number of turns is reached.

[0004] However, the above-mentioned technical solution has a significant limitation: due to the lack of intelligent torque sensing and mechanical overload protection mechanisms at the moment of tightening, if the drive system fails to stop immediately after the lipstick tube is screwed in and the threaded mating surfaces are in full contact, the motor's rotational torque will continue to act on the tube body. This can easily lead to "over-tightening" of the threads, which may result in minor issues such as thread stripping and loosening of components, affecting the user experience; or more serious issues such as localized stress concentration and cracking of the plastic tube body, or deformation and breakage of the internal paste, severely affecting the final product's pass rate and quality consistency. Utility Model Content

[0005] The purpose of this invention is to address the problems existing in the background technology by proposing an automatic screw-on device for lipstick tubes that prevents over-tightening.

[0006] This application provides an automatic screw-on device for preventing over-tightening of lipstick tubes, including a support base and a mounting bracket mounted on the upper surface of the support base, and further including: a drive mechanism disposed on the upper surface of the mounting bracket; a mounting plate and a guide plate mounted on the top and bottom of the mounting bracket, the top of the mounting plate being provided with a positioning mechanism; the positioning mechanism includes an electric push rod mounted on the upper surface of the mounting plate, the output end of the electric push rod passing through the mounting plate and the guide plate and connected to a connecting plate, both ends of the connecting plate being provided with clamping mechanisms, and an anti-over-tightening mechanism being provided between the guide plate and the mounting plate; the anti-over-tightening mechanism includes a drive shaft and a connecting shaft connecting the drive mechanism and the clamping mechanism, the drive shaft and the connecting shaft being connected by an adapter ring, the lower surface of the drive shaft being provided with an inner plate, and the upper surface of the connecting shaft being provided with an outer ring, multiple sliding balls, a first sliding shaft, a limiting plate and a second sliding shaft sliding inside the inner plate, and the sliding balls, the first sliding shaft, the limiting plate and the second sliding shaft being an integral design, and a spring being sleeved on the outer wall of the second sliding shaft.

[0007] Optionally, the drive mechanism includes a motor and three toothed concave pulleys. The motor is mounted on the upper surface of the mounting bracket, and the three toothed concave pulleys are respectively mounted on the motor output end and the middle of the mounting plate. The three toothed concave pulleys are connected by a toothed transmission belt that meshes with them, and the toothed concave pulley located in the middle of the mounting plate is connected to the drive shaft.

[0008] Optionally, the clamping mechanism includes sliding shafts disposed at both ends of a connecting plate, a bracket is connected to the lower surface of the sliding shaft, and a cylinder is installed in the middle of the bracket, with a triangular push plate installed at the output end of the cylinder.

[0009] Optionally, the clamping mechanism further includes a clamp for clamping the lipstick tube and an anti-slip pad, the anti-slip pad being sleeved on the lower side of the outer wall of the clamp, and an adapter plate being installed on the upper surface of the clamp.

[0010] Optionally, the adapter plate 2 is provided with a rotating shaft at one end and in the middle, and the rotating shaft at the end of the adapter plate 2 is connected to the bracket, while the rotating shaft in the middle of the adapter plate 2 is connected to the end of the triangular push plate via a connecting shaft.

[0011] Optionally, the triangular push plate has a groove in the middle for the bracket to slide, and the groove corresponds to the bracket.

[0012] Optionally, the outer ring has a groove inside for the sliding ball to slide, and the edge is curved.

[0013] Optionally, one end of the spring is fixed inside the inner plate, and the other end is fixed to one side of the outer wall of the limiting plate.

[0014] Optionally, the ball slides within the groove and the inner plate, and the limiting plate slides on the inner side of the inner plate.

[0015] Optionally, the inner wall of the sliding shaft slides on the outer wall of the connecting shaft, and the top of the bracket slides inside the connecting shaft. The top of the bracket has a triangular design, allowing the bracket to rotate with the connecting shaft.

[0016] In summary, this application includes at least one of the following beneficial technical effects: By setting a unique anti-over-tightening mechanism, this utility model can automatically cut off the transmission of rotational power when the screw is screwed in place and the torque increases abnormally, allowing the drive shaft to idle, thereby fundamentally avoiding damage to the pipe threads or internal structure caused by over-tightening, and significantly improving the assembly quality and yield of the product.

[0017] Furthermore, a positioning mechanism consisting of an electric push rod and a connecting plate allows for precise control of the initial height of the clamping mechanism and the lipstick tube, as well as the feed depth during rotation. This feed motion is strictly synchronized with the rotational motion, ensuring that the lipstick tube can be smoothly and easily screwed into the base, with accurate thread alignment and excellent assembly consistency.

[0018] Finally, the clamping mechanism adopts a lever-type structure with a cylinder-driven triangular push plate, which amplifies the clamping force and ensures rapid action. Combined with a clamp equipped with anti-slip pads, it ensures that the lipstick tube will not slip or fall off during high-speed rotation. The entire process, from positioning, clamping, screwing, to resetting, is completed automatically, significantly improving production efficiency and reducing labor costs and operational intensity. Attached Figure Description

[0019] Figure 1 A schematic diagram of the overall structure of an automatic screw-on device for preventing over-tightening of lipstick tubes according to this utility model is provided.

[0020] Figure 2 This is a schematic diagram of the mounting plate structure;

[0021] Figure 3 This is a schematic diagram of the connecting plate structure;

[0022] Figure 4 This is a schematic diagram of the fixture structure;

[0023] Figure 5 This is a schematic diagram of the inner panel structure;

[0024] Figure 6 This is a schematic diagram of the internal structure of the outer ring.

[0025] Reference numerals: 1. Support base; 2. Mounting bracket; 3. Guide plate; 4. Mounting plate; 5. Motor; 6. Toothed concave wheel; 7. Toothed transmission belt; 8. Electric push rod; 9. Drive shaft; 10. Connecting shaft; 11. Sliding shaft; 12. Connecting plate one; 13. Bracket; 14. Cylinder; 15. Triangular push plate; 16. Connecting shaft; 17. Adapter plate two; 18. Clamp; 19. Anti-slip pad; 20. Rotating shaft; 21. Adapter ring; 22. Outer ring; 23. Groove; 24. Inner plate; 25. Sliding ball; 26. Sliding shaft one; 27. Limiting plate; 28. Spring; 29. ​​Sliding shaft two. Detailed Implementation

[0026] 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.

[0027] like Figure 1 and Figure 2 As shown, this utility model proposes an automatic screw-on device for preventing over-tightening of lipstick tubes, including a support base 1, a mounting bracket 2, and a drive mechanism disposed on the upper surface of the mounting bracket 2. In one embodiment, the drive mechanism includes a motor 5 and three toothed concave wheels 6. The motor 5 is mounted on the upper surface of the mounting bracket 2, and the three toothed concave wheels 6 are respectively mounted on the output end of the motor 5 and the middle of the mounting plate 4. The three toothed concave wheels 6 are connected by a toothed transmission belt 7 that meshes with them. The toothed concave wheel 6 disposed in the middle of the mounting plate 4 is connected to the drive shaft 9; the inner wall of the sliding shaft 11 slides against the outer wall of the connecting shaft 10, and the top of the bracket 13 slides. Inside the connecting shaft 10, the top of the bracket 13 is triangular, allowing the bracket 13 to rotate with the connecting shaft 10. The driving mechanism is described in detail below: In this embodiment, after the motor 5 starts, its output end drives a toothed concave wheel 6 to rotate. This toothed concave wheel 6 drives the other toothed concave wheels 6 to rotate synchronously through the toothed transmission belt 7. The toothed concave wheel 6 located in the middle of the mounting plate 4 is connected to the driving shaft 9, thereby transmitting the rotational motion to the driving shaft 9. The driving shaft 9 is connected to the connecting shaft 10 through the adapter ring 21 and the anti-overtightening mechanism, so that the connecting shaft 10 rotates synchronously with the driving shaft 9. The connecting shaft 10 ultimately drives the clamping mechanism to screw the lipstick tube onto the shaft.

[0028] like Figure 1 , Figure 2 and Figure 4As shown, the mounting device also includes a positioning mechanism disposed on the top of the mounting plate 4. In one embodiment, the positioning mechanism includes an electric push rod 8 mounted on the upper surface of the mounting plate 4. The output end of the electric push rod 8 passes through the mounting plate 4 and the guide plate 3 and is connected to a connecting plate 12. The positioning mechanism is described in detail below: In this embodiment, when the electric push rod 8 is activated, its output end extends and retracts, causing the connecting plate 12 to move vertically. Both ends of the connecting plate 12 are connected to the sliding shaft 11 in the clamping mechanism. Simultaneously, since the sliding shaft 11 is connected to the bracket 13, the sliding shaft 11 is positioned on the connecting shaft 10. The outer wall slides, while the bracket 13 slides inside the connecting shaft 10. Therefore, the clamping mechanism rises and falls synchronously with the connecting plate 12. At the same time, due to the triangular design of the bracket 13, the bracket 13 can not only slide inside the connecting shaft 10, but also rotate with the rotation of the connecting shaft 10. This allows the connecting shaft 10 to drive the clamping mechanism to rotate. During the screwing process of the lipstick tube, the electric push rod 8 gradually pushes the connecting plate 12 downward according to the preset program, so that the clamping mechanism and the lipstick tube it holds move down slowly, ensuring that the lipstick tube is gradually embedded in place during screwing, avoiding misalignment or damage caused by improper height.

[0029] like Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, the screw-on device also includes an anti-over-tightening mechanism disposed between the guide plate 3 and the mounting plate 4. In one embodiment, the anti-over-tightening mechanism includes a drive shaft 9 and a connecting shaft 10 connecting the drive mechanism and the clamping mechanism. The drive shaft 9 and the connecting shaft 10 are connected via an adapter ring 21. An inner plate 24 is disposed on the lower surface of the drive shaft 9, and an outer ring 22 is disposed on the upper surface of the connecting shaft 10. Multiple sliding balls 25, a first sliding shaft 26, a limiting plate 27, and a second sliding shaft 29 slide inside the inner plate 24. The sliding balls 25, the first sliding shaft 26, the limiting plate 27, and the second sliding shaft 29 are integrated into a single unit. A spring 2 is sleeved on the outer wall of the second sliding shaft 29. 8; The outer ring 22 has a groove 23 inside for the sliding ball 25 to slide, and the edge is curved; one end of the spring 28 is fixed inside the inner plate 24, and the other end is fixed to one side of the outer wall of the limiting plate 27; the sliding ball 25 slides in the groove 23 and inside the inner plate 24, and the limiting plate 27 slides inside the inner plate 24. The anti-overtightening mechanism is described in detail below: In this embodiment, the spring 28 pushes the sliding ball 25 into the groove 23, so that the outer ring 22 drives the connecting shaft 10 to rotate with the drive shaft 9; when it is screwed in place, if it continues to rotate, the sliding ball 25 will compress the spring 28 and disengage from the groove 23, realizing anti-overtightening protection similar to a ratchet mechanism.

[0030] During normal screw-on assembly, the spring 28 pushes the ball bearing 25 into the groove 23 of the outer ring 22. The rotation of the drive shaft 9 is transmitted to the outer ring 22 through the ball bearing 25, driving the connecting shaft 10 to rotate. When the screw-on assembly is completed and the lipstick tube is in place, the connecting shaft 10 is blocked and cannot continue to rotate. If the drive shaft 9 continues to rotate, the ball bearing 25 will be squeezed at the edge of the groove 23, compressing the spring 28 and causing the ball bearing 25 to slide back into the inner plate 24. At this time, the drive shaft 9 spins freely, and the connecting shaft 10 is stationary to prevent the lipstick tube from being over-tightened. When the resistance decreases, the spring 28 returns to its original position, pushing the ball bearing 25 to re-embed in the groove 23, ready for the next screw-on assembly. The edge of the groove 23 is designed with an arc to facilitate the sliding of the ball bearing 25 in and out. The limiting plate 27 and the first and second sliding shafts 26 and 29 ensure the stability of the sliding trajectory.

[0031] like Figures 1-4 As shown, the spin-on device also includes clamping mechanisms disposed at both ends of the connecting plate 12; in one embodiment, the clamping mechanism includes a sliding shaft 11 disposed at both ends of the connecting plate 12, a bracket 13 is transferred to the lower surface of the sliding shaft 11, and a cylinder 14 is installed in the middle of the bracket 13, and a triangular push plate 15 is installed at the output end of the cylinder 14; the clamping mechanism also includes a clamp 18 for clamping the lipstick tube and an anti-slip pad 19, the anti-slip pad 19 is sleeved on the lower side of the outer wall of the clamp 18, and a second adapter plate 17 is installed on the upper surface of the clamp 18; the second adapter plate 17 7 has a rotating shaft 20 at one end and in the middle. The rotating shaft 20 at the end of the adapter plate 17 is connected to the bracket 13. The rotating shaft 20 in the middle of the adapter plate 17 is connected to the end of the triangular push plate 15 through a connecting shaft 16. The triangular push plate 15 has a sliding groove in the middle for the bracket 13 to slide, and the sliding groove corresponds to the bracket 13. The clamping mechanism is described in detail below: In this embodiment, the cylinder 14 pushes the triangular push plate 15 to control the opening and closing of the clamp 18, thereby stably clamping the lipstick tube and rotating it with the connecting shaft 10 to complete the screwing.

[0032] When cylinder 14 pushes triangular push plate 15, triangular push plate 15 moves up and down, and drives the rotating shaft 20 in the middle of adapter plate 17 through connecting shaft 16. One end of adapter plate 17 is connected to bracket 13 through rotating shaft 20. Therefore, adapter plate 17 rotates around rotating shaft 20, thereby driving clamp 18 to open and close. Anti-slip pad 19 is sleeved on the outer wall of clamp 18 to increase clamping friction and prevent lipstick tube from slipping or falling off during rotation, thus achieving clamping and fixing of lipstick tube. Cylinder 14 controls clamping force to ensure that lipstick tube remains stable during high-speed rotation.

[0033] Specifically, when the work begins, the positioning mechanism is activated first. The electric push rod 8 installed on the upper surface of the mounting plate 4 extends according to the preset program. Its output end pushes the connecting plate 12 downward. The connecting plate 12 drives the sliding shafts 11 at both ends to slide down synchronously along the outer wall of the connecting shaft 10, thereby driving the entire clamping mechanism to descend to the preset clamping position and completing the initial height positioning.

[0034] After the clamping mechanism reaches the predetermined position, it immediately moves to grasp the lipstick tube. The cylinder 14 in the middle of the bracket 13 pushes the triangular push plate 15 to move. The movement of the triangular push plate 15 acts on the rotating shaft 20 in the middle of the adapter plate 17 through the connecting shaft 16, forcing the adapter plate 17 to rotate with the rotating shaft 20 at its end as the fulcrum. Finally, it drives the clamp 18 connected to the adapter plate 17 to close. The anti-slip pad 19 at the bottom of the clamp 18 increases the friction, thereby firmly clamping the lipstick tube.

[0035] After the clamping action is completed, the drive mechanism and the anti-over-tightening mechanism work together to begin screwing the lipstick tube. The motor 5 starts and drives the three toothed concave wheels 6 to rotate synchronously through the toothed transmission belt 7. The toothed concave wheel 6 located in the middle of the mounting plate 4 transmits power to the drive shaft 9. During the normal screwing stage, the anti-over-tightening mechanism is engaged: the elastic force of the spring 28 pushes the sliding ball 25 into the groove 23 of the outer ring 22 through the limit plate 27 and the sliding shaft 26. At this time, the rotational torque of the drive shaft 9 is effectively transmitted to the outer ring 22 through the inner plate 24, the sliding ball 25 and the groove 23, which in turn drives the connecting shaft 10 to rotate together. The connecting shaft 10 engages with the top of the bracket 13 through its special triangular structure, thereby driving the entire clamping mechanism and the lipstick tube it holds to rotate together to realize the screwing operation. At the same time, the electric push rod 8 continuously and slowly retracts, pulling the clamping mechanism and the lipstick tube smoothly downward through the connecting plate 12 to ensure that the screwing process is controllable in depth and gradually reaches the correct position.

[0036] When the lipstick tube rotates to the predetermined position, i.e., when it is fully tightened, the bottom of the tube contacts the base, generating a huge resistance that prevents the connecting shaft 10 from rotating further. At this point, if the drive mechanism does not stop in time, the drive shaft 9 will continue to drive the inner plate 24 to rotate. The sliding ball 25 experiences strong reverse resistance on the arc-shaped edge of the groove 23. This resistance overcomes the preload of the spring 28, forcing the sliding ball 25 to compress the spring 28 and slide back into the inner plate 24. At this point, the power connection between the drive shaft 9 and the connecting shaft 10 is cut off, the drive shaft 9 spins freely, while the connecting shaft 10 and the clamping mechanism remain stationary. This effectively prevents the lipstick tube from being over-tightened, avoids damage to the tube or threads, and achieves automatic overload protection.

[0037] After all the spinning processes are completed, the equipment is reset in sequence. First, the motor 5 stops running and the drive shaft 9 stops rotating. Then, the cylinder 14 controls the triangular push plate 15 to move in the opposite direction, driving the clamp 18 to open and release the lipstick tube that has been spun. Finally, the electric push rod 8 extends fully, pushing the entire clamping mechanism to rise and return to the initial standby height, ready for the next work cycle.

[0038] The above specific embodiments are merely several optional embodiments of this utility model. Based on the technical solution of this utility model and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. An automatic screw-on device for preventing over-tightening of lipstick tubes, comprising a support base (1) and a mounting bracket (2) mounted on the upper surface of the support base (1), characterized in that, Also includes: The drive mechanism is located on the upper surface of the mounting bracket (2); Mounting plates (4) and guide plates (3) are installed on the top and bottom of the mounting bracket (2). A positioning mechanism is provided on the top of the mounting plate (4). The positioning mechanism includes an electric push rod (8) installed on the upper surface of the mounting plate (4). The output end of the electric push rod (8) passes through the mounting plate (4) and the guide plate (3) and is connected to a connecting plate (12). Both ends of the connecting plate (12) are provided with clamping mechanisms. An anti-over-tightening mechanism is provided between the guide plate (3) and the mounting plate (4). The anti-over-tightening mechanism includes a drive mechanism that connects the drive mechanism and the clamping mechanism. Shaft (9) and connecting shaft (10) are connected by a transition ring (21). The lower surface of the drive shaft (9) is provided with an inner plate (24), and the upper surface of the connecting shaft (10) is provided with an outer ring (22). Multiple ball bearings (25), sliding shaft one (26), limiting plate (27) and sliding shaft two (29) slide inside the inner plate (24). The ball bearings (25), sliding shaft one (26), limiting plate (27) and sliding shaft two (29) are integrated into one piece. A spring (28) is sleeved on the outer wall of sliding shaft two (29).

2. The automatic screw-on device for preventing over-tightening of lipstick tubes according to claim 1, characterized in that, The drive mechanism includes a motor (5) and three toothed concave wheels (6). The motor (5) is mounted on the upper surface of the mounting bracket (2). The three toothed concave wheels (6) are respectively mounted on the output end of the motor (5) and the middle part of the mounting plate (4). The three toothed concave wheels (6) are connected by a toothed transmission belt (7) that meshes with them. The toothed concave wheel (6) located in the middle part of the mounting plate (4) is connected to the drive shaft (9).

3. The automatic screw-on device for preventing over-tightening of lipstick tubes according to claim 1, characterized in that, The clamping mechanism includes sliding shafts (11) disposed at both ends of the connecting plate (12), a bracket (13) is connected to the lower surface of the sliding shaft (11), and a cylinder (14) is installed in the middle of the bracket (13), and a triangular push plate (15) is installed at the output end of the cylinder (14).

4. The automatic screw-on device for preventing over-tightening of lipstick tubes according to claim 3, characterized in that, The clamping mechanism also includes a clamp (18) for clamping the lipstick tube and an anti-slip pad (19). The anti-slip pad (19) is sleeved on the lower side of the outer wall of the clamp (18), and an adapter plate (17) is installed on the upper surface of the clamp (18).

5. The automatic screw-on device for preventing over-tightening of lipstick tubes according to claim 4, characterized in that, The adapter plate 2 (17) is provided with a rotating shaft (20) at one end and in the middle. The rotating shaft (20) at the end of the adapter plate 2 (17) is connected to the bracket (13). The rotating shaft (20) in the middle of the adapter plate 2 (17) is connected to the end of the triangular push plate (15) through a connecting shaft (16).

6. The automatic screw-on device for preventing over-tightening of lipstick tubes according to claim 5, characterized in that, The triangular push plate (15) has a sliding groove in the middle for the bracket (13) to slide, and the sliding groove corresponds to the bracket (13).

7. The automatic screw-on device for preventing over-tightening of lipstick tubes according to claim 1, characterized in that, The outer ring (22) has a groove (23) inside for the sliding ball (25) to slide, and the edge is curved.

8. The automatic screw-on device for preventing over-tightening of lipstick tubes according to claim 7, characterized in that, One end of the spring (28) is fixed inside the inner plate (24), and the other end is fixed to one side of the outer wall of the limiting plate (27).

9. The automatic screw-on device for preventing over-tightening of lipstick tubes according to claim 8, characterized in that, The ball bearing (25) slides inside the groove (23) and the inner plate (24), and the limiting plate (27) slides inside the inner plate (24).

10. The automatic screw-on device for preventing over-tightening of lipstick tubes according to claim 3, characterized in that, The inner wall of the sliding shaft (11) slides on the outer wall of the connecting shaft (10), and the top of the bracket (13) slides inside the connecting shaft (10). The top of the bracket (13) is triangular, so that the bracket (13) can rotate with the connecting shaft (10).

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