A punching device for plastic caps

Abstract

The utility model relates to the technical field of plastic cover processing, concretely is a kind of plastic cover's punching device, including chassis, the top of chassis is fixed with upper stand, the middle part of upper stand is fixed with two groups of conveying plate, and path structure is formed between two groups of conveying plate, and the conveying plate is installed with push limiting component, the top of upper stand is fixed with upper plate, the top of chassis is fixed with lower plate, and punching assembly is installed between lower plate and upper plate;The punching assembly includes lifting group.This plastic cover's punching device, accurate feeding positioning is achieved through push component, when punching, top cylinder and annular plate clamp plastic cover up and down, cooperate with inductive sheet and sensor to realize cutter accurate steering punching, reduce hole deviation, burr and cap body damage, detection component is optimized imaging by light shield, visual inspection is accurate and efficient, overall degree of automation is high, improve plastic cover punching quality, standardization degree and processing efficiency, reduce artificial cost.

Description

Technical Field

[0001] This utility model relates to the field of plastic cap processing technology, specifically a punching device for plastic caps. Background Technology

[0002] In the beverage industry, especially in the freshly made milk tea sector, plastic lids for milk tea cups are core components for ensuring beverage hygiene, preventing leaks, and enhancing the drinking experience. To accommodate straw insertion, these plastic lids must undergo precise punching during production. Among them, the cross-hole structure has become the mainstream hole type for milk tea cup plastic lids due to its combination of good initial sealing performance and convenient straw insertion. With the explosive growth of the freshly made milk tea industry, production lines have placed stringent demands on the supply speed and quality consistency of plastic lids. The stability of the cross-hole punching process directly determines the finished product qualification rate of plastic lids and the continuity of the production line, and has become a key link restricting the improvement of the production efficiency of milk tea cup accessories.

[0003] Currently, most devices for punching cross holes in plastic lids for milk tea cups use traditional plastic lid processing equipment. In high-speed mass production scenarios, the punch is easily affected by material reaction forces and mechanical vibrations during high-speed stamping, resulting in axial movement. This not only causes rough edges and uneven hole diameters in the cross holes, but also accelerates punch wear and increases the frequency of replacement of vulnerable parts. In addition, the stamping parameters of existing devices are mostly fixed settings, while the thickness and size of plastic lids for different specifications of milk tea cups vary. It is difficult for the equipment to quickly match the optimal stamping speed and pressure, further reducing the stability and adaptability of the cross hole punching process. Utility Model Content

[0004] To achieve the above objectives, this utility model provides the following technical solution: a punching device for a plastic cap, comprising a base frame, an upper frame fixed to the top of the base frame, two sets of conveyor plates fixed to the middle of the upper frame, a path structure formed between the two sets of conveyor plates, a push-limiting component installed on the conveyor plates, an upper plate fixed to the top of the upper frame, a lower plate fixed to the top of the base frame, and a punching assembly installed between the lower plate and the upper plate; the punching assembly comprises a lifting assembly, a lifting frame and a lifting platform fixed to the upper and lower lifting ends of the lifting assembly respectively, a rotating seat rotatably connected to the bottom of the lifting frame, a rotating assembly for driving the rotating seat to rotate installed in the middle, and a pressing assembly installed, a tool holder installed at the bottom of the rotating seat, a cutter locked and fixed at the bottom end of the tool holder, an annular plate adapted to the plastic cap fixed to the pressing end of the pressing assembly, and a top cylinder perpendicularly symmetrical to the tool holder installed on the top of the lifting platform.

[0005] Furthermore, the lifting assembly includes a pair of uprights fixed between the upper plate and the lower plate and passing through the conveyor plate. The lifting frame and the lifting platform are slidably connected to the uprights, and the lifting frame is located above the conveyor plate, while the lifting platform is located below the conveyor plate. A lower-mounted cylinder for driving the lifting frame to move is installed on the top of the upper plate, and an upper-mounted cylinder is fixed on the top of the lower plate. The piston rod of the upper-mounted cylinder is fixed to a U-frame connected to the bottom of the lifting platform.

[0006] Furthermore, the lifting frame includes a lifting plate slidably connected between a pair of uprights, a plurality of central columns fixed to the top of the lifting plate, a lower top plate fixed between the tops of the central columns and fixed to the piston rod of the lower top cylinder, the lower pressing assembly installed on the top of the lifting plate and passing through the lower top plate, the rotating seat installed on the lifting plate, and the rotating assembly installed at the bottom of the lower top plate.

[0007] Furthermore, the pressing assembly consists of multiple sets of downward-pushing cylinders mounted on the lifting plate, with the piston rods of the downward-pushing cylinders passing through the bottom end of the lifting plate and fixed to the annular plate.

[0008] Furthermore, the rotating assembly includes a drive motor mounted on the bottom of the lower top plate, and the drive shaft of the drive motor is fixed to the shaft end of the rotating base.

[0009] Furthermore, a sensing plate is fixed to the outer side of the shaft end of the rotary seat, and a sensor that cooperates with the sensing plate is installed on the top of the lifting plate.

[0010] Furthermore, a base is fixed to the top of the lifting platform, and multiple sleeves are fixed to the top of the base. The sleeves are slidably connected to the top cylinder, and springs are sleeved on the outer side of the sleeves. Recesses are formed on both sides of the top of the top cylinder.

[0011] Furthermore, a set of lower plates is fixed on the base frame, and a pair of uprights that pass through the conveyor plate are also fixed between the lower plate and the upper plate. A detection assembly is installed between the uprights. The detection assembly includes upper and lower push cylinders installed on the upper plate. The piston rod of the lower push cylinder is fixed to an adjusting plate that is slidably connected to the upright. Multiple sets of ejection cylinders are installed on the top of the adjusting plate. A convex light shield is fixed between the piston rod of the ejection cylinder and the bottom end of the adjusting plate. A visual inspection device perpendicular to the light shield is installed at the bottom of the adjusting plate.

[0012] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0013] The punching device for the plastic cap uses a push-pull assembly for precise feeding and positioning. During punching, the top cylinder and the annular plate clamp the plastic cap from top to bottom. With the help of the induction plate and sensor, the cutter can be precisely turned to punch, reducing hole deviation, burrs and damage to the cap. The detection assembly uses a light shield to optimize imaging, making visual inspection accurate and efficient. The overall automation level is high, which improves the punching quality, standardization and processing efficiency of the plastic cap, and reduces labor costs. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a three-dimensional structural diagram of the punching component in this utility model;

[0016] Figure 3 This is a three-dimensional structural diagram of the detection component in this utility model.

[0017] In the diagram: 1. Base frame; 2. Upper frame; 3. Conveyor plate; 4. Push-and-limit assembly; 5. Punching assembly; 51. Upper plate; 52. Lower plate; 53. Upright pole; 54. Lower-mounted cylinder; 55. Lower-mounted plate; 56. Central column; 57. Lifting plate; 58. Drive motor; 59. Rotary seat; 591. Induction plate; 592. Sensor; 510. Tool holder; 511. Cutting knife; 512. Lower-mounted cylinder; 513. Annular plate; 514. Upper-mounted cylinder; 515. U-frame; 516. Lifting platform; 517. Base; 518. Sleeve column; 519. Spring; 520. Top cylinder; 6. Detection assembly; 61. Adjusting plate; 62. Ejection cylinder; 63. Light shield; 64. Visual inspection device. Detailed Implementation

[0018] 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.

[0019] Please see Figure 1-3 This embodiment of a punching device for a plastic cap includes a base frame 1, with an upper frame 2 fixedly connected to the top of the base frame 1 to form an integral rigid frame. Two sets of parallel conveyor plates 3 are fixed in the middle of the upper frame 2, forming a plastic cap conveying path between the two sets of conveyor plates 3. A push-limiting component 4 is installed on the conveyor plate 3. An upper plate 51 is fixed to the top of the upper frame 2, and two sets of lower plates 52 are fixed to the top of the base frame 1 corresponding to the upper plate 51. The length of the upper plate is greater than the length of the lower plate. The upper plate 51 and the lower plate 52 are arranged parallel to each other vertically. A pair of uprights 53 that pass through the conveyor plates are fixed between the two lower plates and the upper plate. A punching component 5 is installed between the two sets of uprights on the left side, and a detection component 6 is installed between the two sets of uprights on the right side. The conveying path is adapted to the size of the plastic cover. The push-limit component 4 can accurately push the plastic cover to the processing station one by one to avoid deviation during the conveying process and ensure that each plastic cover is independently positioned, providing accurate preconditions for the punching process. Then, the punching component completes the punching operation of the cross hole. After the punching is completed, the inspection component checks whether it is qualified.

[0020] like Figure 2 The punching assembly 5 includes a lifting plate 57 and a lifting platform 516 slidably connected between two sets of uprights on the left side. Four sets of central columns 56 are fixed to the top of the lifting plate 57, and a rotating base 59 is rotatably connected to the center. A lower top plate 55 is fixed between the top ends of the central columns. A lower top cylinder 54 for driving the lower top plate to rise and fall is installed on the top of the upper plate. A drive motor 58 for driving the rotating base 59 to rotate is installed at the bottom of the lower top plate. A tool holder 510 is installed at the bottom of the rotating base 59. The lower plate is locked and fixed with a cutter 511. An upper cylinder 514 is installed at the bottom of the lower plate. The piston rod of the upper cylinder 514 is fixed with a U-frame 515 that is fixed to the bottom of the lifting platform 516. A top cylinder 520 is installed on the top of the lifting platform, which is perpendicular and symmetrical to the cutter holder. Steps are formed on both the front and rear sides of the top of the top cylinder 520, so that the protruding end of the top of the top cylinder 520 can extend into the gap between the conveyor plates and touch the bottom of the plastic cover. At the same time, the opening of the top cylinder is the cutter groove when the plastic cover is cut.

[0021] The top cylinder 520 and the cutter holder 510 are arranged vertically and symmetrically. The protruding end of the top cylinder can precisely extend into the gap between the conveyor plates and fit against the bottom of the plastic cover, forming an upper cutter and lower support centering structure. This effectively avoids problems such as hole diameter deviation and hole misalignment caused by positional offset during plastic cover punching, ensuring the consistency of hole position in mass-produced plastic covers. The top cylinder 520 fits against the bottom of the plastic cover for support, which can disperse the instantaneous pressure of the cutter punching, avoiding damage such as edge cracking and cover plate dent caused by excessive local force on the plastic cover. The top cylinder opening serves as a cutter groove, providing a precise cutting channel for the cutter, reducing unnecessary contact between the cutter and the plastic cover, and reducing the risk of material tearing. The drive motor 58 drives the rotary seat 59 and the cutter 511 to rotate in four directions respectively. Combined with the vertical downward pressure of the lower top cylinder 54, a rotary adjustment and vertical feed punching method is formed. Compared with simple stamping punching, it can effectively reduce burrs and rough edges on the plastic cover cut, making the cut smoother and improving the product appearance quality.

[0022] The top of the lifting plate 57 is equipped with two sets of downward-pushing cylinders 512. The cylinder body of the downward-pushing cylinder 512 passes through the lower top plate 55. The piston rod of the downward-pushing cylinder passes through the lifting plate and is fixed with an annular plate 513. The annular plate is adapted to the plastic cover and its inner diameter is larger than that of the tool holder. The annular plate, adapted to the plastic cover and with its inner diameter larger than that of the tool holder, can press the plastic cover from above during punching, forming an upper and lower clamp with the lower top cylinder to prevent it from shifting or warping, thus improving punching stability. The annular plate does not affect the cutting operation, ensuring reliable positioning of the plastic cover without hindering the punching process, further improving product quality and processing efficiency.

[0023] In addition, a sensing plate 591 is fixed to the shaft end of the rotary table 59 connected to the drive motor 58. Four sets of openings are formed around the periphery of the sensing plate. A sensor 592 is installed on the top of the lifting plate 57, which cooperates with the sensing plate 591 to make the rotary table stop accurately in four directions. Therefore, the cutter can be pressed down from four directions to form a cross. Through the cooperation of the sensing plate and the sensor, the rotary table stops accurately every time, and the positions and angles of the cuts of the cross are symmetrical, which improves the standardization of the product. No manual alignment is required. Multi-directional punching is completed automatically, reducing human error, stabilizing product quality, adapting to the cross-shaped processing requirements of plastic caps, meeting the needs of subsequent tube insertion and other usage scenarios, while improving the efficiency of multi-station continuous processing and enhancing the adaptability of the equipment to specific processes.

[0024] The sensor plate rotates synchronously with the rotary table. When the rotary table drives the sensor plate to one of the four preset directional positions, the sensor plate triggers the corresponding sensor, such as a photoelectric sensor or a proximity sensor. After receiving the signal, the sensor feeds it back to the control system, which immediately controls the drive motor to stop rotating, so that the rotary table stops precisely in that direction. Through this coordination of rotation triggering, signal feedback, and motor stopping, the rotary table achieves precise alignment in the four preset directions.

[0025] Further explanation: A base 517 is fixed to the top of the lifting platform 516, and multiple sleeves 518 are fixed to the top of the base 517. The sleeves 518 are slidably connected to the top cylinder 520, and a spring 519 is sleeved on the outside of the sleeves, located between the top cylinder and the base. First, after the plastic cover reaches the designated position, the upper cylinder drives the top cylinder to rise and fit against the bottom of the plastic cover. Then, the lower cylinder drives the annular plate to press down, forming a clamping and positioning with the top cylinder, preventing the plastic cover from shifting or warping during punching. Therefore, the spring can provide cushioning when the top cylinder contacts the plastic cover, avoiding rigid impact that could deform or damage the plastic cover. At the same time, the elastic support of the spring can adapt to slight differences in the thickness of the plastic cover, ensuring that the top cylinder always fits tightly, enhancing support stability. The structure is simple and reliable, improving the stability of punching quality.

[0026] like Figure 3The detection component 6 includes an adjusting plate 61 slidably connected between two sets of uprights on the right side. A second set of downward-pressing cylinders 54 is fixed to the top of the upper plate 51, with their piston rods fixed to the adjusting plate 61. Two sets of ejecting cylinders 62 are fixed to the top of the adjusting plate 61, with their piston rods passing through the adjusting plate 61 and fixed to a convex light shield 63. A visual inspection device 64 is installed at the bottom of the adjusting plate 61 and is perpendicular to the light shield 63. The downward-pressing cylinder can drive the adjusting plate to rise and fall, flexibly adjusting the detection height. The ejecting cylinder drives the light shield to rise and fall. During detection, the ejecting cylinder lowers the light shield to a preset distance above the plastic cover without contact. Then, the visual inspection device of the downward-pressing cylinder extends to the inside of the light shield to avoid interference from external stray light. Simultaneously, the inside of the light shield provides uniform illumination, ensuring the visual inspection device clearly captures the details of the cross-shaped holes, improving the imaging clarity of the visual inspection device. The visual inspection device is perpendicular to the light shield, accurately capturing the quality of the cross-shaped holes in the plastic cover, achieving automated detection, reducing manual sampling costs, and improving the efficiency of product qualification rate control.

[0027] The working principle of the above embodiments is as follows:

[0028] Before the equipment starts, the base frame 1 and the upper frame 2 provide a stable reference. The upper plate 51 and the lower plate 52 form the working frame through the uprights 53. The punching assembly 5 and the detection assembly 6 are arranged along the conveying path. The conveying plate 3 defines the conveying channel for the plastic cap, laying the foundation for precise operation. After processing starts, the plastic cap enters the conveying channel. The push-limiting assembly 4 separates them one by one and pushes them precisely to the punching station, limiting the deviation to achieve stable positioning and providing a preliminary guarantee for punching accuracy. After the plastic cap is positioned, the punching assembly 5 starts according to the program. The upper cylinder 514 drives the top cylinder 520 to rise and fit against the bottom of the plastic cap. The lower cylinder 512 drives the annular plate 513 to press down and tighten. The spring 519 on the outside of the sleeve 518 provides buffering to achieve damage-free clamping and prevent punching deviation. The lower cylinder 54 pushes the cutting assembly to descend. The drive motor 58 drives the cutting blade 511 to adjust its position. The top cylinder 520's opening serves as a cutting groove to ensure punching accuracy. The sensing plate 591... As the rotary table 59 rotates, its opening triggers the sensor 592, which in turn stops the motor, allowing the cutter 511 to precisely punch holes in four directions, forming standard cross holes. After processing, the annular plate 513, top cylinder 520, and cutter assembly are reset sequentially, awaiting the next processing cycle. The punched plastic cap is pushed to the inspection station. The second set of lower cylinders 54 adjusts the inspection height, and the ejector cylinder 62 pushes the light shield 63 to the next preset position. Then, the lower cylinder drives the adjustment plate to rise and fall, thereby extending the vision inspection device into the light shield to isolate stray light and provide uniform illumination, ensuring clear imaging. The vision inspection device 64 captures the cross hole image and uses algorithms to analyze indicators such as hole position and diameter to determine the passability. The results are fed back to the system for sorting. After a single plastic cap completes the entire process, the push limit component 4 continues to feed material. Each component operates in a cycle, realizing automated continuous production of plastic caps and improving efficiency and quality stability.

[0029] The entire workflow is now complete, and anything not described in detail in this specification is existing technology known to those skilled in the art.

[0030] It should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A punching device for a plastic cap, comprising a base frame (1), an upper frame (2) fixed to the top of the base frame (1), two sets of conveyor plates (3) fixed to the middle of the upper frame (2), a path structure being formed between the two sets of conveyor plates (3), and a push-limiting component (4) installed on the conveyor plates (3), characterized in that: The top of the upper frame (2) is fixed with an upper plate (51), and the top of the base frame (1) is fixed with a lower plate (52). A punching assembly (5) is installed between the lower plate (52) and the upper plate (51). The punching assembly (5) includes a lifting assembly, with a lifting frame and a lifting platform (516) fixed at the upper and lower lifting ends of the lifting assembly, respectively. The bottom of the lifting frame is rotatably connected to a rotating seat (59), and a rotating assembly that drives the rotating seat (59) to rotate is installed in the middle, as well as a pressing assembly. A tool holder (510) is installed at the bottom of the rotating seat (59), and a cutter (511) is locked and fixed at the bottom end of the tool holder (510). An annular plate (513) that is compatible with the plastic cover is fixed at the pressing end of the pressing assembly. A top cylinder (520) that is perpendicular and symmetrical to the tool holder (510) is installed on the top of the lifting platform (516).

2. The punching device for a plastic cap according to claim 1, characterized in that: The lifting assembly includes a pair of uprights (53) fixed between the upper plate (51) and the lower plate (52) and passing through the conveyor plate (3). The lifting frame and the lifting platform (516) are slidably connected to the uprights (53). The lifting frame is located above the conveyor plate (3), and the lifting platform (516) is located below the conveyor plate (3). The top of the upper plate (51) is equipped with a lower top cylinder (54) that drives the lifting frame to move. The top of the lower plate (52) is fixed with an upper top cylinder (514). The piston rod of the upper top cylinder (514) is fixed with a U-frame (515) that is connected to the bottom of the lifting platform (516).

3. The punching device for a plastic cap according to claim 2, characterized in that: The lifting frame includes a lifting plate (57) slidably connected between a pair of uprights (53), a number of central columns (56) are fixed to the top of the lifting plate (57), a lower top plate (55) is fixed between the tops of the central columns (56) and is fixed to the piston rod of the lower top cylinder (54), the lower pressing group is installed on the top of the lifting plate (57) and passes through the lower top plate (55), the rotating seat (59) is installed on the lifting plate (57), and the rotating group is installed at the bottom of the lower top plate (55).

4. The punching device for a plastic cap according to claim 3, characterized in that: The pressing group consists of multiple sets of downward-pushing cylinders (512) installed on the lifting plate (57). The piston rod of the downward-pushing cylinder (512) passes through the bottom end of the lifting plate (57) and is fixed to the annular plate (513).

5. The punching device for a plastic cap according to claim 3, characterized in that: The rotating assembly includes a drive motor (58) mounted on the bottom of the lower top plate (55), and the drive shaft of the drive motor (58) is fixed to the shaft end of the rotating base (59).

6. The punching device for a plastic cap according to claim 5, characterized in that: A sensor plate (591) is fixed on the outer side of the shaft end of the rotary seat (59), and a sensor (592) that cooperates with the sensor plate (591) is installed on the top of the lifting plate (57).

7. The punching device for a plastic cap according to claim 2, characterized in that: The top of the lifting platform (516) is fixed with a base (517), and the top of the base (517) is fixed with multiple sleeves (518). The sleeves (518) are slidably connected to the top cylinder (520). A spring (519) is sleeved on the outside of the sleeves (518), and recesses are formed on both sides of the top of the top cylinder (520).

8. The punching device for a plastic cap according to claim 2, characterized in that: A set of lower plates (52) are also fixed on the base frame (1). A pair of uprights (53) that pass through the conveyor plate (3) are also fixed between the lower plate (52) and the upper plate (51). A detection assembly (6) is installed between the uprights (53). The detection assembly (6) includes upper and lower push cylinders (54) installed on the upper plate (51). The piston rod of the lower push cylinder (54) is fixed with an adjusting plate (61) that is slidably connected to the uprights (53). Multiple sets of ejection cylinders (62) are installed on the top of the adjusting plate (61). A convex light shield (63) is fixed between the piston rod of the ejection cylinder (62) and the bottom end of the adjusting plate (61). A visual inspection device (64) that is perpendicular to the light shield (63) is installed at the bottom of the adjusting plate (61).

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