Paper cup convex groove forming device

Abstract

The utility model relates to the technical field of paper cup processing and production, and discloses a paper cup convex groove forming device which comprises a shell, a conveying belt is arranged in the shell, a top plate is fixedly connected to the top of the shell, an electric pump is arranged at the top of the top plate, and a first telescopic rod is fixedly connected to the bottom of the top plate. Two limiting rods are fixedly connected to the bottom of the top plate, a mold is fixedly connected to the bottom end of a first telescopic rod, a middle shaft is slidably connected to the interior of the first telescopic rod, a sliding rod is fixedly connected to the outer wall of the middle shaft, and a first inner mold is in threaded connection to the bottom of the middle shaft. According to the utility model, the inner mold I is inserted into the inner wall of the R-shaped convex groove and is fixed, then the R-shaped convex groove is driven to move upwards, and the operations of edge rolling of the cup opening and the convex groove of the cup body are completed subsequently when the paper cup to be treated is positioned under the mold, so that the edge rolling of the cup opening and the convex groove of the cup body can be performed simultaneously, the forming efficiency of the paper cup is improved, and the production process and the time cost are reduced.

Description

Technical Field

[0001] This utility model relates to the field of paper cup processing and production technology, and in particular to a paper cup groove forming device. Background Technology

[0002] In the modern packaging industry, paper cups, as a widely used disposable beverage container, have seen continuous improvements in production technology and quality requirements. To enhance the practicality and stability of paper cups, the addition of grooves to the cup body has become a common design. These grooves not only strengthen the structural strength of the paper cup, allowing it to better maintain its shape when filled with hot or cold drinks, preventing deformation and leakage, but also provide users with a more comfortable grip and reduce the risk of the paper cup slipping during use. Paper cups with R-grooves protruding outward from the inner wall of the upper part of the cup body can also be used for scalar lines when filling fruit juices.

[0003] A search revealed Chinese patent publication number CN214563245U, which discloses a paper cup groove forming device for a paper cup machine and its usage method. The device includes a housing with an adjustment groove at the top. A third electric push rod is fixedly installed on both sides of the housing's interior. A clamping plate is fixedly installed at the output end of the third electric push rod, and the clamping plate has multiple sets of suction holes. A mounting frame is fixedly installed on the rear side of the top of the housing, and a first electric push rod is fixedly installed on the mounting frame. This invention features suction holes that cooperate with a suction tube and a vacuum pump to suction and fix the paper cup during processing, increasing stability and practicality. An operation panel with an emergency stop button allows for control of the device during use. The emergency stop button also allows for emergency stopping in case of an emergency, increasing safety and making the forming device easier to use and expanding its applicability. However, this device lacks a cup rim rolling mechanism, preventing simultaneous cup grooving during rim rolling. Utility Model Content

[0004] To overcome the above deficiencies, this utility model provides a paper cup groove forming device, which aims to improve the problem that the cup body groove operation cannot be performed at the same time as the cup rim is rolled.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a paper cup groove forming device, comprising a housing, a conveyor belt disposed inside the housing, a top plate fixedly connected to the top of the housing, an electric pump disposed on the top of the top plate, a telescopic rod fixedly connected to the bottom of the top plate, two limiting rods fixedly connected to the bottom of the top plate, a mold fixedly connected to the bottom end of the telescopic rod, a central shaft slidably connected inside the telescopic rod, a sliding rod fixedly connected to the outer wall of the central shaft, an inner mold threadedly connected to the bottom of the central shaft, a material picking assembly disposed inside the housing, a material conveying assembly disposed inside the housing, and a material discharging mechanism disposed inside the housing, the material discharging mechanism being used to output the processed paper cups onto the conveyor belt.

[0006] Through the above technical solution, the overall structure of the paper cup groove forming device was built. The components cooperate with each other. The conveyor belt can transport materials. The electric pump drives the telescopic rod to drive the mold to perform the cup mouth edge rolling operation. The central shaft and the inner mold cooperate to form the cup body groove. The material picking component, the material conveying component and the material discharging mechanism ensure the material flow and finished product output, achieving the effect of efficient and continuous production of paper cup grooves.

[0007] As a further description of the above technical solution:

[0008] The discharge mechanism includes a support frame, the bottom of which is slidably connected to the inner wall of the outer shell, a top block is fixedly connected to the top of the outer wall of the support frame, a rotating frame is rotatably connected to the inner wall of the support frame, a plurality of suction cups are fixedly connected to the outer wall of the rotating frame, a rotating plate is fixedly connected to one side of the outer wall of the rotating frame, and a counterweight is provided on the other side of the outer wall of the rotating frame.

[0009] Through the above technical solution: the components of the discharge mechanism work together, the support frame can slide and adjust its position, the top block can push the paper cup out, the rotating frame rotates to make the suction cup adsorb the paper cup, and the rotating plate and counterweight block cooperate to adjust the angle of the rotating frame, thus achieving the effect of stably and efficiently outputting the processed paper cup from the device to the conveyor belt.

[0010] As a further description of the above technical solution:

[0011] The material handling assembly includes two sliders, the outer walls of which are slidably connected to the inner wall of the top plate, and the bottom of which are fixedly connected to a fixing plate.

[0012] Through the above technical solution, the slider of the material picking component can slide on the inner wall of the top plate, driving the fixed plate to move, realizing the flexible movement of the material picking component in the horizontal direction, and accurately positioning the material to be picked up.

[0013] As a further description of the above technical solution:

[0014] The bottom of the fixed plate is fixedly connected to a telescopic rod two, and the bottom end of the telescopic rod two is fixedly connected to a mounting base.

[0015] Through the above technical solution, the extension and retraction of the telescopic rod 2 allows the mounting base to move vertically, and combined with the horizontal movement of the slider, the material handling component can be adjusted in three-dimensional space.

[0016] As a further description of the above technical solution:

[0017] The bottom of the mounting base is fixedly connected to two mounting rods, and the bottom of the mounting rod on the left is threadedly connected to an inner mold.

[0018] Through the above technical solution: the mounting rod provides stable support for the inner mold 2, the threaded connection facilitates the disassembly and replacement of the inner mold 2, and the inner mold can be replaced according to different materials, thereby improving the applicability and accuracy of the material handling component.

[0019] As a further description of the above technical solution:

[0020] The material transfer assembly includes a servo motor, the outer wall of which is fixedly connected to the top of the top plate, and a rotating rod is fixedly connected to the output end of the servo motor.

[0021] The above technical solution involves a servo motor fixed to the top of the top plate and running stably, driving the rotating rod to rotate and providing rotational power for the material transfer assembly.

[0022] As a further description of the above technical solution:

[0023] The bottom end of the rotating rod is fixedly connected to a support plate, and the top of the outer wall of the support plate is connected to a support cylinder.

[0024] The above technical solution involves a rotating rod that drives the pallet to rotate, while a support cylinder fixes and supports the material, ensuring the stability of the material during transport and making the transport process smooth and reliable.

[0025] As a further description of the above technical solution:

[0026] An electrical cabinet is provided on the right side of the outer wall of the outer shell, a controller is provided on the front side of the outer wall of the outer shell, and multiple adsorption holes are provided on the outer wall of the inner mold.

[0027] Through the above technical solutions: the electrical cabinet centrally stores and protects electrical equipment and lines; the controller facilitates operators in setting and adjusting device operating parameters; and the adsorption holes of the inner mold can firmly adsorb the R-shaped protrusions.

[0028] This utility model has the following beneficial effects:

[0029] 1. In this utility model, the inner mold is inserted into the inner wall of the R-shaped groove and fixed, and then the R-shaped groove is moved upward. Subsequently, when the paper cup to be processed is located directly below the mold, the cup mouth edge rolling and cup body groove operation are completed. This allows the cup mouth edge rolling and cup body groove operation to be carried out simultaneously, improving the forming efficiency of the paper cup and reducing production processes and time costs.

[0030] 2. In this utility model, the top of the rotating plate is pressed by the bottom of the tray, which drives the rotating frame to rotate upward, so that the suction cup on the outer wall of the rotating frame can approach and contact the outer wall of the paper cup. Then the suction cup generates an adsorption force to firmly adhere to the paper cup, so that the paper cup can be stably gripped and ensured that it will not fall off during the dispensing process. Attached Figure Description

[0031] Figure 1 This is a perspective view of a paper cup groove forming device proposed in this utility model;

[0032] Figure 2 This is a front view of a paper cup groove forming device proposed in this utility model;

[0033] Figure 3 This is a partial structural schematic diagram of a paper cup groove forming device proposed in this utility model;

[0034] Figure 4 This is a schematic diagram of the material handling component of a paper cup groove forming device proposed in this utility model;

[0035] Figure 5 This is a schematic diagram of the material transfer component of a paper cup groove forming device proposed in this utility model;

[0036] Figure 6 This is a schematic diagram of the discharge mechanism of a paper cup groove forming device proposed in this utility model.

[0037] Legend:

[0038] 1. Outer shell; 2. Discharge mechanism; 201. Support frame; 202. Top block; 203. Rotating frame; 204. Suction cup; 205. Rotating plate; 206. Counterweight; 3. Conveyor belt; 4. Top plate; 5. Electric pump; 6. Telescopic rod one; 7. Limiting rod; 8. Mold; 9. Central shaft; 10. Sliding rod; 11. Inner mold one; 12. Sliding block; 13. Fixing plate; 14. Telescopic rod two; 15. Mounting base; 16. Mounting rod; 17. Inner mold two; 18. Servo motor; 19. Rotating rod; 20. Support plate; 21. Support cylinder; 22. Electrical cabinet; 23. Controller; 24. Suction hole. Detailed Implementation

[0039] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. 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.

[0040] See attached document Figure 1 Appendix Figure 2 and attached Figure 3 This utility model provides an embodiment of a paper cup groove forming device, including a shell 1. The shell 1 serves as the external protective structure of the entire device, protecting the internal components from interference and damage from the external environment, and ensuring the stable operation of the device. A conveyor belt 3 is installed inside the shell 1 to transport the paper cups and R-shaped grooves to be processed, allowing the materials to enter each processing stage in an orderly manner, achieving continuous production. A top plate 4 is fixedly connected to the top of the shell 1, providing a stable support platform for other components installed on its top and bottom, ensuring that these components are firmly installed and accurately positioned. An electric pump 5 is installed on the top of the top plate 4, serving as a power source to provide power for the telescopic rod's extension and retraction, driving the components to complete corresponding actions. A telescopic rod 6 is fixedly connected to the bottom of the top plate 4, extending and retracting under the drive of the electric pump 5, thereby driving the mold 8 connected to the bottom to move up and down, realizing the processing operation of the paper cups. Two limiting rods 7 are fixedly connected to the bottom of the top plate 4, limiting and guiding the movement of the telescopic rod 6, ensuring the extension and retraction of the telescopic rod 6. 6. To maintain a stable and accurate movement trajectory during the telescopic process and avoid swaying or deviation, a mold 8 is fixedly connected to the bottom end of the telescopic rod 6. The mold 8 is used for the cup rim forming operation of the paper cup. A central shaft 9 is slidably connected inside the telescopic rod 6. The central shaft 9 can slide inside the telescopic rod 6 and adjust the position of the inner mold 11 to adapt to the processing requirements of paper cups of different sizes. A sliding rod 10 is fixedly connected to the outer wall of the central shaft 9. The sliding rod 10 limits the sliding distance and position of the central shaft 9. The bottom of the central shaft 9 is threadedly connected to the inner mold 11. 1 is used to adsorb and install the R-shaped groove and combine it with the inner wall of the paper cup to form the cup body groove. The inner mold 11 can be easily disassembled and replaced through the threaded connection. The outer wall of the inner mold 11 is provided with multiple adsorption holes 24. The adsorption holes 24 can generate adsorption force to firmly adsorb the R-shaped groove and ensure that the R-shaped groove will not fall off or shift during the processing. The inner shell 1 is provided with a material picking component, a material conveying component, and a material discharging mechanism 2. The material discharging mechanism 2 is used to output the processed paper cup to the conveyor belt 3.

[0041] Specifically, the outer shell 1 provides protection and ensures the stable operation of internal components. The conveyor belt 3 enables orderly material transport and achieves continuous production. The top plate 4 provides stable support for the electric pump 5 and the telescopic rod 6. The electric pump 5 drives the telescopic rod 6 to drive the mold 8 to complete the cup rim rolling operation. The limit rod 7 ensures stable and accurate movement. The central shaft 9 cooperates with the slide rod 10 to flexibly adjust the position of the inner mold 11 to adapt to the needs of different paper cup specifications. The inner mold 11 firmly adsorbs the R-shaped groove through the adsorption hole 24 to realize the cup body groove forming and is easy to disassemble and replace.

[0042] See attached document Figure 1 Appendix Figure 2 and attached Figure 6 The discharging mechanism 2 includes a support frame 201, the bottom of which is slidably connected to the inner wall of the outer casing 1. This sliding connection allows the support frame 201 to move flexibly within the outer casing 1, adapting to different discharging position requirements. A top block 202 is fixedly connected to the top of the outer wall of the support frame 201. The top block 202 moves with the support frame 201. When the support frame 201 moves upward, the top block 202 pushes the processed paper cups inside the support cylinder 21 upward a certain distance, preparing for the smooth discharging of subsequent paper cups. A rotating frame 203 is rotatably connected to the inner wall of the support frame 201. The rotating frame 203 can rotate within the inner wall of the support frame 201, adjusting its angle to allow the components mounted on it to... The rotating frame 203 has multiple suction cups 204 fixedly connected to its outer wall. When the rotating frame 203 is rotated to a suitable position, the suction cups 204 can tightly adhere to the outer wall of the paper cup and firmly grasp the paper cup with the adsorption force, ensuring that the paper cup will not fall during the discharge process and ensuring the stability of the discharge. A rotating plate 205 is fixedly connected to one side of the outer wall of the rotating frame 203. When the rotating plate 205 is subjected to the pressure of the bottom of the support plate 20, it can drive the rotating frame 203 to rotate around the rotation connection point with the support frame 201 as the axis, realizing the flexible adjustment of the angle of the rotating frame 203 and further optimizing the gripping position of the paper cup. A counterweight 206 is provided on the other side of the outer wall of the rotating frame 203 to drive the rotating frame 203 to rotate downward.

[0043] Specifically, the sliding connection between the bottom of the support frame 201 and the inner wall of the outer shell 1 allows it to move flexibly and adjust its position according to actual needs. The top block 202 moves with the support frame 201 and can push the paper cups out of the support cylinder 21, creating favorable conditions for material discharge. The rotating frame 203 can rotate on the inner wall of the support frame 201, making it convenient to adjust the angle to approach and grab the paper cups. Multiple suction cups 204 can firmly adhere to the paper cups and prevent them from falling during discharge. When the rotating plate 205 is under pressure, it can drive the rotating frame 203 to rotate, further optimizing the gripping position and improving the gripping accuracy. The counterweight block 206 drives the rotating frame 203 to rotate downwards, ensuring that the paper cups can smoothly detach from the support cylinder 21.

[0044] See attached document Figure 2Appendix Figure 4 and attached Figure 5 The material-grabbing component includes two sliders 12, the outer walls of which are slidably connected to the inner wall of the top plate 4. This design allows the sliders 12 to slide smoothly on the inner wall of the top plate 4, thereby driving the material-grabbing component to move flexibly in the horizontal direction and accurately reach the position to be picked up. A fixing plate 13 is fixedly connected to the bottom of each slider 12, providing a stable connection base for the components below. A telescopic rod 14 is fixedly connected to the bottom of the fixing plate 13, enabling the vertical adjustment of the material-grabbing component so that the inner mold 17 can accurately approach the material to be picked up. A mounting base 15 is fixedly connected to the bottom of the telescopic rod 14, providing a stable platform for the mounting rod 16. Two mounting rods 16 are fixedly connected to the bottom of the mounting base 15, providing support and positioning, and providing a suitable installation position and stable support structure for the inner mold. The bottom of the left mounting rod 16 is threadedly connected to the inner mold 17. This threaded connection facilitates the disassembly and replacement of the inner mold 17, which can be adjusted according to the specifications of different materials. The inner mold 17 with shape change adaptability improves the applicability and accuracy of material picking. The material transfer component includes a servo motor 18. The outer wall of the servo motor 18 is fixedly connected to the top of the top plate 4, ensuring the reliability and stability of the servo motor 18 during operation and providing continuous and stable power to the material transfer component. The output end of the servo motor 18 is fixedly connected to a rotating rod 19, which provides rotational power for material transfer. The bottom end of the rotating rod 19 is fixedly connected to a support plate 20. The support plate 20 rotates with the rotating rod 19 and is used to carry and transport materials, ensuring the stability of materials during the transfer process. The top of the outer wall of the support plate 20 is connected to a support cylinder 21, which can further fix and support the materials, preventing the materials from shaking or falling during the transfer process and ensuring the smooth progress of the material transfer process. An electrical cabinet 22 is set on the right side of the outer wall of the outer shell 1. The electrical cabinet 22 can centrally store and protect electrical equipment and lines. A controller 23 is set on the front side of the outer wall of the outer shell 1. The controller 23 facilitates the operator to set and adjust the operating parameters and working mode of the device.

[0045] Specifically, in the material handling assembly, the slider 12 slides on the inner wall of the top plate 4, driving the material handling assembly to move horizontally to the material handling position. The fixing plate 13 is firmly connected to the lower component, and the telescopic rod 14 realizes vertical position adjustment, so that the inner mold 17 is accurately close to the material. The mounting base 15 and the mounting rod 16 provide stable support for the inner mold 17, and the threaded connection makes it easy to replace the inner mold 17, improving the applicability and accuracy of material handling. In the material transfer assembly, the servo motor 18 is fixed on the top of the top plate 4, stably outputting power to drive the rotating rod 19 to drive the pallet 20 to rotate, carrying and transporting materials. The support cylinder 21 further fixes the materials, ensuring stable material transfer.

[0046] Working principle: Paper cups to be processed and R-shaped grooves are placed on both sides of the conveyor belt 3. When the paper cups to be processed and the R-shaped grooves on the conveyor belt 3 move, the picking component starts to work. When it is below the picking component, the telescopic rod 14 extends, and the inner mold 17 and the inner mold 11 are respectively inserted into the inner walls of the paper cups to be processed and the R-shaped grooves on the conveyor belt 3. At the same time, the suction hole 24 adsorbs their inner walls. Then the telescopic rod 14 retracts, and the slider 12 drives the picking component to move towards the transfer component. The inner walls of the support cylinder 21 and the tray 20 in the transfer component respectively engage with the outer walls of the paper cups to be processed and the R-shaped grooves. Then the servo motor 18 drives the rotating rod 19, the tray 20, the support cylinder 21, and the paper cups to be processed and the R-shaped grooves to rotate. First, the R-shaped groove on the inner wall of the tray 20 reaches the bottom of the inner mold 11. At this time, the telescopic rod 6 extends, the inner mold 11 inserts into the inner wall of the R-shaped groove, and is fixed to the outer wall of the inner mold 11 under the action of the suction hole 24. The telescopic rod 6 retracts and drives the R-shaped groove to move upward synchronously. Then the servo motor 18 rotates, and the paper cup to be processed in the support cylinder 21 is directly below the mold 8. At this time, the telescopic rod 6 extends, and the internal structure of the mold 8 acts on the top of the paper cup to be processed, completing the cup mouth curling operation. At the same time, the R-shaped groove on the inner mold 11 contacts the inner wall of the paper cup and combines with the inner wall of the paper cup under the action of the inner mold 11, that is, the cup mouth is curled while the cup body groove operation is performed. When it is necessary to adjust the position of the groove in the paper cup, the inner mold 11 can be rotated to adjust its vertical position on the central axis 9, thereby adjusting the distance between the inner mold 11 and the mold 8.

[0047] Furthermore, after the paper cups are processed in the device, the discharging mechanism 2 begins to function, realizing the paper cup discharging operation. The bottom of the support frame 201 of the discharging mechanism 2 is slidably connected to the inner wall of the outer shell 1. Driven by the electric pump 5, the support frame 201 moves upward as a whole, and the top block 202 fixedly connected to the top of the outer wall of the support frame 201 moves upward accordingly. The top block 202 pushes the processed paper cups in the support cylinder 21 upward a certain distance, preparing for subsequent discharging. At the same time, the top of the rotating plate 205 is pressed by the bottom of the support plate 20. Under this pressure, the rotating frame 203 is connected to the support frame The rotating connection point of 201 rotates axially upwards. Multiple suction cups 204 fixedly connected to the outer wall of the rotating frame 203 approach and contact the outer wall of the paper cup as the rotating frame 203 rotates. Then, the suction cups 204 generate an adsorption force and tightly adsorb the paper cup. After that, the electric pump 5 changes its direction of action, causing the discharge mechanism 2 to move downwards as a whole. Since the other side of the outer wall of the rotating frame 203 is equipped with a counterweight 206, the rotating frame 203 rotates downwards and moves downwards under the action of gravity. The downward movement of the rotating frame 203 drives the paper cup adsorbed by the suction cups 204 to move downwards together, so that the paper cup is detached from the support cylinder 21 and reaches the top of the conveyor belt 3.

[0048] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A paper cup fluting forming apparatus comprising a housing (1) characterised in that: The inside of the shell (1) is provided with a conveyor belt (3), the top of the shell (1) is fixedly connected with a top plate (4), the top of the top plate (4) is provided with an electric pump (5), the bottom of the top plate (4) is fixedly connected with a telescopic rod one (6), the bottom of the top plate (4) is fixedly connected with two limit rods (7), the bottom end of the telescopic rod one (6) is fixedly connected with a mold (8), the inside of the telescopic rod one (6) is slidably connected with a middle shaft (9), the outer wall of the middle shaft (9) is fixedly connected with a sliding rod (10), the bottom of the middle shaft (9) is threadedly connected with an inner mold one (11), the inside of the shell (1) is provided with a material taking assembly, the inside of the shell (1) is provided with a material conveying assembly, the inside of the shell (1) is provided with a discharging mechanism (2), and the discharging mechanism (2) is used for outputting the processed paper cup to the conveyor belt (3).

2. A paper cup fluting forming device as claimed in claim 1, wherein: The discharging mechanism (2) comprises a support frame (201), the bottom of the support frame (201) is slidably connected to the inner wall of the shell (1), the outer wall top of the support frame (201) is fixedly connected with a top block (202), the inner wall of the support frame (201) is rotatably connected with a rotating frame (203), the outer wall of the rotating frame (203) is fixedly connected with a plurality of suction cups (204), one side of the outer wall of the rotating frame (203) is fixedly connected with a rotating plate (205), and the other side of the outer wall of the rotating frame (203) is provided with a counterweight (206).

3. A paper cup fluting forming device as claimed in claim 1, wherein: The material taking assembly comprises two sliding blocks (12), the outer walls of the two sliding blocks (12) are slidably connected to the inner walls of the top plate (4), and the bottoms of the two sliding blocks (12) are fixedly connected with fixed plates (13).

4. A paper cup fluting forming device as claimed in claim 3, wherein: The bottom of the fixed plate (13) is fixedly connected with a telescopic rod two (14), and the bottom end of the telescopic rod two (14) is fixedly connected with a mounting seat (15).

5. A paper cup fluting forming device as claimed in claim 4, wherein: The bottom of the mounting seat (15) is fixedly connected with two mounting rods (16), and the bottom of the left mounting rod (16) is threadedly connected with an inner mold two (17).

6. A paper cup fluting forming device as claimed in claim 1, wherein: The material conveying assembly comprises a servo motor (18), the outer wall of the servo motor (18) is fixedly connected to the top of the top plate (4), and the output end of the servo motor (18) is fixedly connected with a rotating rod (19).

7. A paper cup fluting forming device as claimed in claim 6, wherein: The bottom end of the rotating rod (19) is fixedly connected with a supporting plate (20), and the outer wall top of the supporting plate (20) is communicated with a supporting cylinder (21).

8. A paper cup fluting forming device as claimed in claim 1, wherein: The outer wall right side of the shell (1) is provided with an electric cabinet (22), the outer wall front side of the shell (1) is provided with a controller (23), and the outer wall of the inner mold one (11) is provided with a plurality of suction holes (24).

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