Seawater injection system for seabed operation

Abstract

The seawater injection system comprises a main body frame, a high-pressure injection pump and an injection device are arranged on the main body frame, the high-pressure injection pump is communicated with the interior of the injection device through a liquid pipeline, a nozzle is arranged on the injection device, and the high-pressure injection pump is communicated with the interior of the injection device through a liquid pipeline. The high-pressure injection pump is used for compressing seawater into high-pressure liquid, and the high-pressure liquid flows into the injection device through the liquid pipeline and is sprayed out of the nozzle for seabed operation. The liquid pipeline comprises a fixing section, a transition section and a connecting section which are sequentially connected to form a right angle, and the transition section is of a hollow stand column structure integrated on the main body frame. According to the liquid pipeline structure, the pressure loss caused by pipeline bending is reduced; the transition section serves as a stand column structure integrated on the main body frame, so that the structural strength of the system is enhanced, and arrangement and connection of pipelines are facilitated.

Description

Technical Field

[0001] The invention belongs to the technical field of marine underwater operation engineering, and in particular relates to a seawater jetting system for seabed operations. Background Art

[0002] The laying of submarine cables requires the use of special operating equipment to dig trenches and bury cables. The trenching method is generally a jet-breaking operation method, which uses seawater jetting to break the ground and dig trenches, and requires a matching jetting system. At present, the liquid pipeline of the jetting device is separately set on the frame. This design method requires a large installation space, increases the frame volume, and is not conducive to the stability of the entire operating equipment. Summary of the invention

[0003] The purpose of the present invention is to solve the deficiencies of the above-mentioned background technology and to provide a seawater jetting system for seabed operations with simple structure and high stability.

[0004] The technical solution adopted by the present invention is: a seawater jetting system for seabed operations, comprising a main frame, a high-pressure jet pump and a jetting device are arranged on the main frame, the high-pressure jet pump is connected to the inside of the jetting device through a liquid pipeline, the jetting device is provided with a nozzle, the high-pressure jet pump is used to compress seawater into high-pressure liquid, the high-pressure liquid flows to the inside of the jetting device through the liquid pipeline, and is ejected from the nozzle for seabed operations;

[0005] The liquid pipeline includes a fixed section, a transition section and a connecting section which are connected in sequence to form a right angle. One end of the fixed section is connected to the output port of the high-pressure jet pump, and the other end is connected to the interior of the transition section. One end of the connecting section is connected to the interior of the transition section, and the other end of the connecting section is used to connect to the injection device. The transition section is a column structure integrated on the main frame and hollow inside.

[0006] Furthermore, one end of the connecting section extends to the interior of the transition section to form an extension section, and a plurality of diversion holes are formed on the extension section.

[0007] Furthermore, the cross-sectional area of ​​the column structure is larger than the cross-sectional areas of the fixing section and the connecting section.

[0008] Furthermore, the ejection device is an ejection arm, which includes a fixed seat and a plurality of fixed nozzles of different lengths. The plurality of fixed nozzles are arranged in order from short to long. The plurality of fixed nozzles are located in the same vertical plane and are arranged obliquely. The shortest fixed nozzle is located at the bottom. One end of the fixed seat is connected to the liquid pipeline and the other end is connected to the fixed nozzle. A channel connecting the liquid pipeline and the fixed nozzle is provided in the fixed seat. The plurality of nozzles are arranged at the bottom of the plurality of fixed nozzles.

[0009] Furthermore, the plurality of nozzles are divided into a first nozzle and a second nozzle according to different arrangement directions of the nozzle axes, and the first nozzle and the second nozzle are arranged alternately.

[0010] Furthermore, it also includes an angle adjustment mechanism, which is used to adjust the angle of the punching device. One end of the angle adjustment mechanism is connected to the punching device, and the other end is connected to the main frame.

[0011] Furthermore, two sets of high-pressure jet pumps and two sets of injection devices are provided on the main frame, and the two sets of high-pressure jet pumps are connected to the two sets of injection devices through liquid pipelines respectively. The combined structure of the two sets of high-pressure jet pumps and the injection device is symmetrically arranged on both sides of the bottom of the main frame.

[0012] Furthermore, a movable trolley is provided on the main body support, the movable trolley is arranged above the two sets of ejection devices and is movably connected to the two sets of ejection devices, and the movable trolley is used to adjust the distance between the two sets of ejection devices.

[0013] Furthermore, the movable cart comprises a top guide groove, a side guide groove, two cantilever supports, two clamping parts and two telescopic hydraulic cylinders, and the two telescopic hydraulic cylinders are respectively arranged corresponding to the two clamping parts; the top guide groove and the side guide groove are fixed on the main frame and arranged along the moving direction of the punching device;

[0014] The clamping part is used to clamp the end of the punching device, and the punching device can rotate around the clamping point. The top of the clamping part cooperates with the top guide groove through the top guide wheel. One end of the cantilever support is connected to the inner side of the clamping part, and the other end of the cantilever support cooperates with the side guide groove through the side guide wheel. One end of the telescopic hydraulic cylinder is fixed on the main frame and the other end is connected to the clamping part. The distance between the two sets of punching devices can be adjusted by driving the clamping part to move along the arrangement direction of the guide groove through the telescopic hydraulic cylinder.

[0015] Furthermore, the clamping part includes a top plate, a bottom plate and two side plates arranged opposite to each other, the top plate is arranged in parallel with the bottom plate, the two sides of the top plate are respectively fixedly connected to the upper ends of the two side plates, the two ends of the bottom plate are respectively fixedly connected to the bottom ends of the two side plates, the top guide wheel is fixed to the top of the side plate, the bottom surface of the top plate and the top surface of the bottom plate are provided with three supporting wheels arranged in a triangle, and the end of the ejection device is in contact with and connected to the three supporting wheels.

[0016] The beneficial effects of the present invention are:

[0017] The present invention integrates a high-pressure jet pump and a jet device into a main frame to form a compact and efficient seawater jet system. The high-pressure jet pump compresses seawater into a high-pressure liquid, transports it to the jet device through a liquid pipeline, and sprays it from a nozzle to perform seabed operations, thereby effectively improving the operating efficiency. The liquid pipeline includes a right-angle fixed section, a transition section and a connecting section that are sequentially connected to ensure smooth flow of liquid in the pipeline while reducing pressure loss caused by pipeline bending. The transition section is a column structure integrated on the main frame, which not only enhances the structural strength of the system, but also facilitates the layout and connection of the pipeline.

[0018] One end of the connecting section of the present invention extends to the interior of the transition section to form an extension section, and a plurality of diversion holes are opened on the extension section. This design enables the high-pressure liquid to be more evenly distributed before flowing into the injection device, thereby improving the injection effect and uniformity.

[0019] The cross-sectional area of ​​the column structure of the present invention is larger than the cross-sectional areas of the fixed section and the connecting section, thereby enhancing the pressure bearing capacity and stability of the pipeline and ensuring the safe transmission of high-pressure liquid in the pipeline.

[0020] The jetting device of the present invention adopts the form of a jetting arm, including a fixed seat and a plurality of fixed nozzles of different lengths. The fixed nozzles are arranged in order from short to long and are tilted, thereby improving the rigidity and stability of the jetting arm and avoiding shaking; the nozzles are divided into a first nozzle and a second nozzle and are arranged in an interlaced manner, so that the ejected water flow can cover the target area more evenly and shear the seabed soil more effectively.

[0021] The angle adjustment mechanism of the present invention can adjust the angle of the jet device, so that the system can adapt to different seabed terrains and operation requirements, thereby improving the flexibility and adaptability of the system.

[0022] The main frame of the present invention is provided with two sets of high-pressure jet pumps and two sets of jet devices, which are symmetrically arranged on both sides of the bottom of the main frame, thereby improving the operating efficiency and stability of the system and ensuring the continuity and reliability of the seabed operation.

[0023] The movable cart of the present invention is arranged above the two sets of injection devices and is movably connected with them, and can adjust the distance between the two sets of injection devices, so that the system can adjust the operating range according to needs, thereby improving the flexibility and efficiency of the operation.

[0024] The movable cart of the present invention comprises a top guide groove, a side guide groove, a cantilever support, a clamping part and a telescopic hydraulic cylinder. The clamping part is driven by the telescopic hydraulic cylinder to move along the guide groove, so that the distance between the punching devices can be accurately adjusted. The clamping part adopts a structure composed of a top plate, a bottom plate and a side plate, which can stably clamp the end of the punching device and allow it to rotate around the clamping point. This design ensures the stability and safety of the punching device during the adjustment process. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a partial schematic diagram of the present invention.

[0026] Figure 2 It is a partial schematic diagram of the liquid pipeline of the present invention.

[0027] Figure 3 Another partial schematic diagram of the liquid pipeline of the present invention.

[0028] Figure 4 Schematic diagram of the arrangement of the nozzles of the present invention.

[0029] Figure 5 It is a partial schematic diagram of the movable cart of the present invention.

[0030] In the figure, 1-main frame; 1.1-column; 2-high-pressure jet pump; 3-liquid pipeline; 3.1-fixed section; 3.2-transition section; 3.3-connecting section; 3.3.1-guide section; 3.3.2-telescopic section; 3.4-extension section; 3.5-diverter hole; 4-injection device; 4.1-nozzle; 4.1.1-first nozzle; 4.1.2-second nozzle; 4.2-fixed seat; 4.2.1-hinge section; 4.2.2-fixed plate; 4.3-fixed nozzle; 5-angle adjustment mechanism; 6-movable trolley; 6.1-top guide groove; 6.2-side guide groove; 6.3-cantilever support; 6.4-clamping part; 6.4.1-top plate; 6.4.2-bottom plate; 6.4.3-side plate; 6.4.4-support wheel; 6.5-top guide wheel; 6.6-side guide wheel. DETAILED DESCRIPTION

[0031] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0032] like Figure 1-5As shown, the present invention provides a seawater jetting system for seabed operations, including a main frame 1, on which a high-pressure jet pump 2 and a jetting device 4 are provided, the high-pressure jet pump 2 is connected to the inside of the jetting device 4 through a liquid pipeline 3, the jetting device 4 is provided with a nozzle 4.1, the high-pressure jet pump 2 is used to compress seawater into high-pressure liquid, the high-pressure liquid flows to the inside of the jetting device 4 through the liquid pipeline 3, and is ejected from the nozzle 4.1 for seabed operations; the present invention integrates the high-pressure jet pump 2 and the jetting device 4 through the main frame 1, so as to form a compact and efficient seawater jetting system, the high-pressure jet pump compresses seawater into high-pressure liquid, transports it to the jetting device through the liquid pipeline, and ejects it from the nozzle for seabed operations, thereby effectively improving the operation efficiency.

[0033] The liquid pipeline 3 includes a fixed section 3.1, a transition section 3.2 and a connecting section 3.3 which are connected in sequence to form a right angle. One end of the fixed section 3.1 is connected to the output port of the high-pressure jet pump 2, and the other end is connected to the inside of the transition section 3.2. One end of the connecting section 3.3 is connected to the inside of the transition section 3.2, and the other end of the connecting section 3.3 is used to connect to the injection device 4. The transition section 3.2 is a column structure integrated on the main frame 1 and hollow inside. The liquid pipeline 3 includes a fixed section 3.1, a transition section 3.2 and a connecting section 3.3 which are connected in sequence to form a right angle, ensuring the smooth flow of the liquid in the pipeline; the transition section 3.2, as a column structure integrated on the main frame, not only enhances the structural strength of the system, but also facilitates the arrangement and connection of the pipeline.

[0034] It is understandable that one end of the connecting section 3.3 extends to the inside of the transition section to form an extension section 3.4, and a plurality of diversion holes 3.5 are opened on the extension section 3.4. In the present invention, one end of the connecting section extends to the inside of the transition section 3.2 to form an extension section 3.4, and a plurality of diversion holes 3.5 are opened on the extension section, so that the high-pressure liquid can be more evenly distributed before flowing into the injection device, thereby improving the injection effect and uniformity.

[0035] It is understandable that the cross-sectional area of ​​the column 1.1 structure is larger than the cross-sectional area of ​​the fixed section 3.1 and the connecting section 3.3. The cross-sectional area of ​​the column structure of the present invention is larger than the cross-sectional area of ​​the fixed section and the connecting section, which can ensure that the liquid has sufficient flow and also ensure the safe transmission of high-pressure liquid in the pipeline.

[0036] In some embodiments, the jet device 4 is a jet arm, which includes a fixed seat 4.2, a plurality of fixed nozzles 4.3 of different lengths, the plurality of fixed nozzles 4.3 are arranged in order from short to long, the plurality of fixed nozzles 4.3 are located in the same vertical plane and are arranged obliquely, the shortest fixed nozzle is located at the bottom, one end of the fixed seat 4.2 is connected to the liquid pipeline 3, and the other end is connected to the fixed nozzle 4.3, a channel connecting the liquid pipeline and the fixed nozzle is provided in the fixed seat 4.2, and the plurality of nozzles 4.1 are arranged at the bottom of the plurality of fixed nozzles 4.3. The plurality of nozzles are divided into a first nozzle 4.1.1 and a second nozzle 4.1.2 according to the different arrangement directions of the nozzle axis, and the first nozzle 4.1.1 and the second nozzle 4.1.2 are arranged alternately. The jetting device of the present invention adopts the form of a jetting arm, including a fixed seat 4.2 and a plurality of fixed nozzles 4.3 of different lengths. The fixed nozzles are arranged in order from short to long and are tilted, which improves the rigidity and stability of the jetting arm and avoids shaking; the nozzles are divided into a first nozzle and a second nozzle and are arranged in an interlaced manner, so as to more effectively shear the seabed soil.

[0037] In some embodiments, an angle adjustment mechanism 5 is further included, and the angle adjustment mechanism 5 is used to adjust the angle of the jet device 4. The angle adjustment mechanism is preferably a telescopic hydraulic cylinder, and one end of the angle adjustment mechanism 5 is connected to the jet device 4, and the other end is connected to the main frame 1. The angle adjustment mechanism 5 of the present invention can adjust the angle of the jet device 4, so that the system can adapt to different seabed terrains and operation requirements, and improve the flexibility and adaptability of the system.

[0038] In some embodiments, the main frame 1 is provided with two sets of high-pressure jet pumps 2 and two sets of jet devices 4, the two sets of high-pressure jet pumps 2 are respectively connected with the two sets of jet devices 4 through liquid pipelines 3, and the combined structure of the two sets of high-pressure jet pumps 2 and the jet devices 4 is symmetrically arranged on both sides of the bottom of the main frame 1. The main frame of the present invention is provided with two sets of high-pressure jet pumps and two sets of jet devices, which are symmetrically arranged on both sides of the bottom of the main frame, which improves the operating efficiency and stability of the system and ensures the continuity and reliability of seabed operations.

[0039] In some embodiments, when the high-pressure jet pump 2 and the jet device 4 are symmetrically arranged on the main frame 1, a movable trolley 6 is provided on the main frame 1, and the movable trolley 6 is used to adjust the distance between the two sets of jet devices 4. The movable trolley 6 is provided above the two sets of jet devices 4 and is movably connected to the two sets of jet devices 4. The movable trolley 6 of the present invention is provided above the two sets of jet devices 4 and is movably connected to them, and can adjust the distance between the two sets of jet devices 4, so that the system can adjust the operating range as needed, thereby improving the flexibility and efficiency of the operation. Because the movable trolley 6 will adjust the position of the injection device 4, the connecting section 3.3 on the liquid pipeline 3 needs to be provided with a telescopic part to adapt to the distance adjustment. At this time, the connecting section 3.3 includes a guide section 3.3.1 and a telescopic section 3.3.2. One end of the guide section 3.3.1 is connected to the transition section 3.2, and the other end is sleeved on the surface of the telescopic section 3.3.3. One end of the telescopic section 3.3.2 extends to the inside of the transition section 3.2 after passing through the guide section 3.3.1. The extension section 3.4 is part of the telescopic section 3.3.2, and the other end of the telescopic section 3.3.2 is connected to the fixed seat 4.2 of the injection device 4.

[0040] In some embodiments, Figure 3 As shown, the movable cart 6 includes a top guide groove 6.1, a side guide groove 6.2, a cantilever support 6.3, two clamping parts 6.4 and two telescopic hydraulic cylinders (not shown in the figure), and the two telescopic hydraulic cylinders are arranged corresponding to the two clamping parts 6.4 respectively; the top guide groove 6.1 and the side guide groove 6.2 are fixed on the main frame 1 and arranged along the moving direction of the punching device; the clamping part 6.4 is used to clamp the end of the punching device, and the punching device can rotate around the clamping point, and the top of the clamping part 6.4 cooperates with the top guide groove 6.1 through the top guide wheel 6.5, one end of the cantilever support 6.3 is connected to the inner side of the clamping part 6.4, and the other end of the cantilever support 6.3 cooperates with the side guide groove 6.2 through the side guide wheel 6.6, one end of the telescopic hydraulic cylinder is fixed on the main frame 1, and the other end is connected to the clamping part 6.4, and the distance between the two punching devices 4 is adjusted by driving the clamping part 6.4 to move along the guide groove arrangement direction through the telescopic hydraulic cylinder. The top guide wheel 6.5 and the side guide wheel 6.6 each include two guide wheels arranged perpendicular to each other, and the two guide wheels are arranged alternately at intervals, so that the movable cart can withstand both lateral forces and longitudinal forces. The movable cart of the present invention includes components such as a top guide groove, a side guide groove, a cantilever support, a clamping part, and a telescopic hydraulic cylinder. The clamping part is driven by the telescopic hydraulic cylinder to move along the guide groove, thereby realizing precise adjustment of the distance between the punching devices.

[0041] The clamping portion 6.4 comprises a top plate 6.4.1, a bottom plate 6.4.2 and two side plates 6.4.3 arranged opposite to each other. The top plate 6.4.1 is arranged in parallel with the bottom plate 6.4.2. Both sides of the top plate 6.4.1 are fixedly connected to the upper ends of the two side plates 6.4.3 respectively. Both ends of the bottom plate 6.4.2 are fixedly connected to the bottom ends of the two side plates 6.4.3 respectively. The top guide wheel 6.5 is fixed to the top of the side plate 6.4.3. The bottom surface of the top plate 6.4.1 and the top surface of the bottom plate 6.4.2 are provided with three supporting wheels 6.4.4 arranged in a triangle. The end of the hinged section of the ejection device is in contact with the three supporting wheels 6.4.4. When the angle adjustment mechanism 5 adjusts the rotation angle of the ejection device 4, the hinged section can rotate in the clamping portion 4.4. The three-point arranged supporting wheels not only ensure the rotation function, but also improve the stability of the entire mechanism. The clamping part of the present invention adopts a structure composed of a top plate, a bottom plate and a side plate, which can stably clamp the end of the punching device and allow it to rotate around the clamping point, thereby ensuring the stability and safety of the punching device during the adjustment process.

[0042] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in the field.

Claims

1. A seawater jetting system for seabed operations, characterized in that: The invention comprises a main frame (1), wherein a high-pressure jet pump (2) and a jet device (4) are provided on the main frame, wherein the high-pressure jet pump (2) is connected to the inside of the jet device (4) through a liquid pipeline (3), and the jet device (4) is provided with a nozzle, wherein the high-pressure jet pump (2) is used to compress seawater into high-pressure liquid, and the high-pressure liquid flows into the inside of the jet device (4) through the liquid pipeline (3) and is ejected from the nozzle (4.1) to perform seabed operations; The liquid pipeline (3) comprises a fixed section (3.1), a transition section (3.2) and a connecting section (3.3) which are connected in sequence to form a right angle; one end of the fixed section (3.1) is connected to the output port of the high-pressure jet pump (2) and the other end is connected to the inside of the transition section (3.2); one end of the connecting section (3.3) is connected to the inside of the transition section (3.2); the other end of the connecting section (3.3) is used to connect to the injection device (4); the transition section (3.2) is a column (1.1) structure which is integrated on the main frame (1) and has a hollow interior.

2. The seawater jetting system for seabed operations according to claim 1, characterized in that: One end of the connecting section (3.3) extends to the interior of the transition section (3.2) to form an extension section (3.4), and a plurality of diversion holes (3.5) are formed on the extension section (3.4).

3. The seawater jetting system for seabed operations according to claim 1, characterized in that: The cross-sectional area of ​​the column (1.1) structure is greater than the cross-sectional areas of the fixing section (3.1) and the connecting section (3.3).

4. The seawater jetting system for seabed operations according to claim 1, characterized in that: The ejection device (4) is an ejection arm, comprising a fixed seat (4.2), a plurality of fixed nozzles (4.3) of different lengths, the plurality of fixed nozzles (4.3) being arranged in order from short to long, the plurality of fixed nozzles (4.3) being located in the same vertical plane and being arranged obliquely, with the shortest fixed nozzle being located at the bottom, one end of the fixed seat (4.2) being connected to the liquid pipeline (3) and the other end being connected to the fixed nozzle (4.3), a channel connecting the liquid pipeline (3) and the fixed nozzle (4.3) being provided in the fixed seat (4.2), and the plurality of nozzles being arranged at the bottom of the plurality of fixed nozzles (4.3).

5. The seawater jetting system for seabed operations according to claim 4, characterized in that: The plurality of nozzles (4.1) are divided into a first nozzle (4.1.1) and a second nozzle (4.1.2) according to different arrangement directions of the nozzle axes, and the first nozzle (4.1.1) and the second nozzle (4.1.2) are arranged alternately with each other.

6. The seawater jetting system for seabed operations according to claim 1, characterized in that: It also comprises an angle adjustment mechanism (5), which is used to adjust the angle of the punching device (4), and one end of the angle adjustment mechanism (5) is connected to the punching device (4), and the other end is connected to the main frame (1).

7. The seawater jetting system for seabed operations according to claim 1, characterized in that: The main frame (1) is provided with two sets of high-pressure jet pumps (2) and two sets of jet devices (4); the two sets of high-pressure jet pumps (2) are connected to the two sets of jet devices (4) via liquid pipelines (3) respectively; the combined structure of the two sets of high-pressure jet pumps (2) and the jet devices (4) is symmetrically arranged on both sides of the bottom of the main frame (1).

8. The seawater jetting system for seabed operations according to claim 7, characterized in that: A movable trolley (6) is also provided on the main frame. The movable trolley (6) is arranged above the two sets of punching devices (4) and is movably connected to the two sets of punching devices (4). The movable trolley (6) is used to adjust the distance between the two sets of punching devices (4).

9. The seawater jetting system for seabed operations according to claim 8, characterized in that: The movable cart (6) comprises a top guide groove (6.1), a side guide groove (6.2), two cantilever supports (6.3), two clamping parts (6.4) and two telescopic hydraulic cylinders, and the two telescopic hydraulic cylinders are arranged corresponding to the two clamping parts (6.4) respectively; the top guide groove (6.1) and the side guide groove (6.2) are fixed on the main frame and arranged along the moving direction of the punching device; The clamping part (6.4) is used to clamp the end of the punching device (4), and the punching device (4) can rotate around the clamping point. The top of the clamping part (6.4) cooperates with the top guide groove (6.1) through the top guide wheel (6.5). One end of the cantilever support (6.3) is connected to the inner side of the clamping part, and the other end of the cantilever support (6.3) cooperates with the side guide groove (6.2) through the side guide wheel (6.6). One end of the telescopic hydraulic cylinder is fixed on the main frame, and the other end is connected to the clamping part (6.4). The telescopic hydraulic cylinder drives the clamping part (6.4) to move along the arrangement direction of the guide groove to achieve the distance adjustment between the two sets of punching devices (4).

10. The seawater jetting system for seabed operations according to claim 9, characterized in that: The clamping part (6.4) comprises a top plate (6.4.1), a bottom plate (6.4.2) and two side plates (6.4.3) arranged opposite to each other. The top plate (6.4.1) and the bottom plate (6.4.2) are arranged in parallel. Both sides of the top plate (6.4.1) are fixedly connected to the upper ends of the two side plates (6.4.3) respectively. Both ends of the bottom plate (6.4.2) are fixedly connected to the bottom ends of the two side plates (6.4.3) respectively. The top guide wheel (6.5) is fixed to the top of the side plate (6.4.3). The bottom surface of the top plate (6.4.1) and the top surface of the bottom plate (6.4.2) are provided with three supporting wheels (6.4.4) arranged in a triangle. The end of the punching device (4) is in contact with and connected to the three supporting wheels (6.4.4).

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