Telescopic lifting crane for multipurpose rescue boat

Abstract

The utility model relates to the technical field of hoisting cranes, in particular to a telescopic hoisting crane for a multipurpose rescue boat. Which comprises a base and is characterized in that a slewing bearing is arranged in the center of the top of the base, an oilless bearing is arranged in the slewing bearing, a central slewing joint is arranged on the top of the slewing bearing, a slewing speed reducer assembly is installed on the central slewing joint, and an energy storage assembly is arranged on the other side of the slewing speed reducer assembly. A tower is arranged in the center of the top of the slewing bearing, a cover plate is arranged on the top of the tower, and a straight-through forced filling oil cup is arranged on one side of the cover plate. By arranging the rescue boat winch and the hydraulic winch, the requirements for rescue boat hoisting and cargo hoisting can be met at the same time, and the device is suitable for various operation scenes such as sea rescue, cargo hoisting and oil field equipment maintenance; a slewing bearing and an oilless bearing are adopted, and a central slewing joint and a slewing speed reducer assembly are combined, so that the stability and the reliability of the crane in the slewing process are ensured, and vibration and noise are reduced.

Description

Technical Field

[0001] This utility model relates to the field of crane technology, and in particular to a multi-purpose telescopic crane for rescue boats. Background Technology

[0002] Cranes are indispensable equipment in offshore operations, oil field development, and emergency rescue. Traditional cranes are limited in function, typically only capable of single tasks such as cargo lifting or rescue boat deployment, making them unsuitable for complex operational needs. Furthermore, traditional cranes have limitations in stability, operational flexibility, and safety, especially in the harsh environment of the sea where reliability and efficiency are paramount.

[0003] Chinese patent publication number (CN 207002046 U) discloses a crane comprising: a lifting boom and an operating platform. A drum is located at the top of the lifting boom, with a hanging hook wound on the drum. The operating platform includes a receiving device, a display, and a control unit. An auxiliary calibration device is also located at the top of the lifting boom, comprising a fixing component, a diagonal bar, and an annular bend. The fixing component is mounted on the lifting boom, the diagonal bar connects to the fixing component, and an annular bend is fixed to the end of the diagonal bar. At least two pairs of symmetrically distributed cameras are mounted at the bottom of the annular bend. However, this type of crane has a limited function, typically only capable of performing single tasks such as cargo lifting or rescue boat release, making it difficult to meet complex operational needs. Furthermore, traditional cranes have certain shortcomings in terms of stability, operational flexibility, and safety, especially in harsh maritime environments where equipment reliability and efficiency are paramount. Therefore, a multi-purpose telescopic rescue boat crane is needed. Utility Model Content

[0004] The purpose of this invention is to address the limitations of traditional cranes, which typically only perform single tasks such as cargo lifting or rescue boat release, making them unsuitable for complex operations. Furthermore, traditional cranes suffer from shortcomings in stability, operational flexibility, and safety, especially in harsh maritime environments where reliability and efficiency are paramount. Therefore, this invention proposes a multi-purpose telescopic rescue boat crane.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a multi-purpose telescopic crane for rescue boats, including a base, characterized in that: a slewing bearing is provided at the center of the top of the base, an oilless bearing is provided inside the slewing bearing, a central slewing joint is provided at the top of the slewing bearing, a slewing reducer assembly is installed on the central slewing joint, an energy storage component is provided on the other side of the slewing reducer assembly, a tower is provided at the center of the top of the slewing bearing, a cover plate is provided at the top of the tower, a straight-through pressure injection cup is provided on one side of the cover plate, a first pulley is provided on one side of the straight-through pressure injection cup, a main shaft is provided at the connection between the cover plate and the tower, a first V-shaped stop is provided on the main shaft, a clamping plate is provided at the top of the cover plate, a telescopic cylinder is provided inside the clamping plate, a plate-type one-way balance valve is provided on one side of the telescopic cylinder, a rescue boat winch is provided on one side of the tower, the maximum allowable angle of the rescue boat winch under working conditions is ≤20°, a telescopic mechanism assembly is installed at the top of the tower, a hydraulic winch is provided at the top of the telescopic mechanism assembly, and a second pulley is provided on the hydraulic winch. Multifunctionality: By incorporating both a rescue boat winch and a hydraulic winch, it can simultaneously meet the needs of rescue boat lifting and cargo lifting, adapting to various operational scenarios; High stability: Employing a slewing bearing and oilless bearings, combined with a central slewing joint and slewing reducer assembly, ensures the crane's stability and reliability during rotation; Flexible operation: The design of the telescopic cylinder and plate-type one-way balance valve allows for flexible adjustment of the telescopic mechanism to adapt to different working conditions; Strong safety: The maximum allowable angle of the rescue boat winch is ≤20°, ensuring the safety of rescue missions and avoiding instability or danger caused by excessive angles; Convenient maintenance: The design of the straight-through pressure injection cup facilitates the addition and maintenance of lubricating oil, extending the equipment's service life.

[0006] Preferably, the energy storage assembly includes an AB-type accumulator with an accumulator clamp. A right luffing plate is connected to one end of the AB-type accumulator. The AB-type accumulator can store energy from the hydraulic system and release it quickly when needed, improving the system's response speed and efficiency. The design of the accumulator clamp ensures that the AB-type accumulator will not loosen or shift during operation, improving equipment stability. The connection to the right luffing plate allows the energy storage assembly to work in conjunction with the luffing cylinder, further enhancing the crane's luffing performance.

[0007] Preferably, a luffing cylinder is provided on one side of the top of the slewing bearing. One end of the luffing cylinder has a first connecting member, and the other end has a second connecting member. One end of the first connecting member is associated with the slewing bearing, and one end of the second connecting member is associated with the main boom. A first cylinder pin is provided on the first connecting member, and a second cylinder pin is provided on the second connecting member. The design of the luffing cylinder allows the crane to flexibly adjust the boom angle to adapt to different height and distance operating requirements. The first and second connecting members are fixed by cylinder pins, ensuring a firm and reliable connection between the luffing cylinder, the slewing bearing, and the main boom. The luffing cylinder has a simple structural design, is easy to install and maintain, and reduces operating costs.

[0008] Preferably, valve group 1 is provided on one side of the slewing reducer assembly, and valve group 2 is provided on the other side of the tower. Valve group 2 is equipped with a sealing plate. The design of valve groups 1 and 2 enables precise control of the hydraulic system, ensuring coordinated operation of all parts of the crane. The sealing plate prevents dust and moisture from entering the valve groups, extending their service life. The reasonable distribution of the valve groups facilitates operation and maintenance, improving equipment efficiency.

[0009] Preferably, the telescopic mechanism assembly includes a telescopic boom and a basic boom, with an oilfield hook located below the front end of the telescopic boom. The design of the oilfield hook enables the crane to be used for lifting and maintaining oilfield equipment, expanding the application scenarios of the equipment; the combination of the telescopic boom and the basic boom makes the telescopic mechanism assembly compact, facilitating transportation and installation; the design of the oilfield hook meets the requirements of high-intensity operations, ensuring the safety and reliability of the lifting process.

[0010] Preferably, the slewing bearing has a diameter of φ1130mm. A left luffing plate is located on one side of the top of the slewing bearing, and a mounting plate is located on one side of the left luffing plate. A shock-resistant pressure gauge is located on the top of the mounting plate, and a four-way valve is located on one side of the mounting plate. The shock-resistant pressure gauge is designed to monitor pressure changes in the hydraulic system in real time, ensuring the safety of equipment operation. The four-way valve enables multi-channel control of the hydraulic system, improving the operational flexibility of the equipment. The combination of the left luffing plate and the mounting plate ensures the stability and reliability of the top structure of the slewing bearing.

[0011] Preferably, the telescopic arm is provided with a guide wheel at its top, and the guide wheel is provided with a guide wheel pin. The design of the guide wheel makes the telescopic arm run more smoothly during the extension and retraction process, reducing friction and wear; the setting of the guide wheel pin ensures that the connection between the guide wheel and the telescopic arm is firm and reliable, improving the service life of the equipment; the structural design of the guide wheel is simple, easy to disassemble and maintain, and reduces the operating cost.

[0012] The advantages of this utility model are:

[0013] This application, by incorporating a rescue boat winch and a hydraulic winch, can simultaneously meet the needs of rescue boat lifting and cargo lifting, adapting to various operational scenarios such as maritime rescue, cargo lifting, and oilfield equipment maintenance. The use of a slewing bearing and oilless bearings, combined with a central slewing joint and slewing reducer assembly, ensures the stability and reliability of the crane during rotation, reducing vibration and noise. The design of the telescopic cylinder and plate-type one-way balance valve allows for flexible adjustment of the telescopic mechanism to adapt to operational needs at different heights and distances. The design of the luffing cylinder makes boom angle adjustment more convenient; the maximum allowable angle of the rescue boat winch is ≤20°, ensuring the safety of rescue missions and avoiding instability or danger caused by excessive angles. A shock-resistant pressure gauge monitors the hydraulic system pressure in real time, ensuring safe equipment operation; the design of a straight-through pressure injection cup facilitates the addition and maintenance of lubricating oil, extending the equipment's service life. The valve group and energy storage assembly have a simple structural design, facilitating disassembly and maintenance; the design of the oilfield hook and hydraulic winch makes the equipment suitable for various scenarios such as oilfield equipment lifting, cargo transportation, and maritime rescue, expanding the equipment's application range. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Please see Figure 1-5 As shown:

[0016] Figure 1 This is a schematic diagram of the overall assembly structure of this utility model;

[0017] Figure 2 This is a top view of the overall assembly structure of this utility model.

[0018] Figure 3 This is a schematic diagram of the assembly structure on the right side of this utility model.

[0019] Figure 4 This utility model Figure 1 Sectional view of AA.

[0020] Figure 5 This is a schematic diagram of the telescopic mechanism assembly of this utility model.

[0021] In the diagram: 1. Plate-type one-way balance valve; 2. Four-way valve; 3. First connecting piece; 4. Second connecting piece; 5. Telescopic mechanism assembly; 6. Tower; 7. Luffing cylinder; 8. Main shaft; 9. First cylinder pin; 10. Second cylinder pin; 11. Main boom; 12. Guide wheel; 13. Guide wheel pin; 14. Base; 15. Telescopic boom; 16. Clamping plate; 17. Slewing bearing; 18. Right luffing plate; 19. Left luffing plate; 20. 21. Oil-free bearing; 25. First pulley; 26. Mounting plate; 27. Vibration-resistant pressure gauge; 28. Slewing reducer assembly; 29. ​​Central slewing joint; 30. Oilfield hook; 31. Telescopic cylinder; 32. Cover plate; 33. Rescue boat winch; 34. Straight-through pressure injection cup; 35. Second pulley; 36. AB type accumulator; 37. Accumulator clamp; 38. Hydraulic winch; 39. Valve group 1; 40. Sealing plate; 51. Valve group 2. Detailed Implementation

[0022] 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 scope of protection of the present utility model.

[0023] Example

[0024] Please see Figure 1-5 As shown:

[0025] A multi-purpose telescopic crane for rescue boats includes a base 14. The base 14 has a slewing bearing 17 at its top center, an oil-free bearing 20 inside the slewing bearing 17, a central slewing joint 28 at the top of the slewing bearing, a slewing reducer assembly 27 mounted on the central slewing joint 28, an energy storage component on the other side of the slewing reducer assembly 27, a tower 6 at the top center of the slewing bearing 17, a cover plate 31 at the top of the tower 6, and a straight-through pressure injection cup 33 on one side of the cover plate 31. A first pulley 21 is provided on one side of the cover plate 31. A main shaft 8 is provided at the connection between the cover plate 31 and the tower 6. A first V-shaped stop is provided on the main shaft 8. A clamping plate 16 is provided on the top of the cover plate 31. A telescopic cylinder 30 is provided inside the clamping plate 16. A plate-type one-way balance valve 1 is provided on one side of the telescopic cylinder 30. A rescue boat winch 32 is provided on one side of the tower 6. The maximum allowable angle of the rescue boat winch 32 under working conditions is ≤20°. A telescopic mechanism assembly 5 is installed on the top of the tower 6. A hydraulic winch 37 is provided on the top of the telescopic mechanism assembly 5. A second pulley 34 is provided on the hydraulic winch 37. Multifunctionality: By setting up a rescue boat winch 32 and a hydraulic winch 37, it can simultaneously meet the needs of rescue boat lifting and cargo lifting, adapting to various operating scenarios; High stability: Adopting a slewing bearing 17 and an oilless bearing 20, combined with a central slewing joint 28 and a slewing reducer assembly 27, ensures the stability and reliability of the crane during the slewing process; Flexible operation: The design of the telescopic cylinder 30 and the plate-type one-way balance valve 1 allows the telescopic mechanism to be flexibly adjusted to adapt to different working conditions; Strong safety: The maximum allowable angle of the rescue boat winch 32 is ≤20°, ensuring the safety of rescue missions and avoiding instability or danger caused by excessive angle; Convenient maintenance: The design of the straight-through pressure injection cup 33 facilitates the addition and maintenance of lubricating oil, extending the service life of the equipment.

[0026] In this embodiment, the energy storage assembly includes an AB-type accumulator 35, which is equipped with an accumulator clamp 36. A right luffing plate 18 is connected to one end of the AB-type accumulator 35. The AB-type accumulator 35 can store energy from the hydraulic system and release it quickly when needed, improving the system's response speed and efficiency. The design of the accumulator clamp 36 ensures that the AB-type accumulator 35 will not loosen or shift during operation, improving the stability of the equipment. The connection to the right luffing plate 18 allows the energy storage assembly to work in conjunction with the luffing cylinder 7, further enhancing the luffing performance of the crane.

[0027] In this embodiment, a luffing cylinder 7 is provided on one side of the top of the slewing bearing. One end of the luffing cylinder 7 has a first connecting member 3, and the other end has a second connecting member 4. One end of the first connecting member 3 is associated with the slewing bearing 17, and one end of the second connecting member 4 is associated with the main boom 11. A first cylinder pin 9 is provided on the first connecting member 3, and a second cylinder pin 10 is provided on the second connecting member 4. The design of the luffing cylinder 7 allows the crane to flexibly adjust the boom angle to adapt to different height and distance operating requirements. The first connecting member 3 and the second connecting member 4 are fixed by cylinder pins, ensuring a firm and reliable connection between the luffing cylinder 7, the slewing bearing 17, and the main boom 11. The luffing cylinder 7 has a simple structural design, is easy to install and maintain, and reduces operating costs.

[0028] In this embodiment, a valve group 38 is provided on one side of the slewing reducer assembly 27, and a valve group 40 is provided on one side of the tower 6. A sealing plate 39 is provided on the valve group 40. The design of valve groups 38 and 40 enables precise control of the hydraulic system, ensuring coordinated operation of all parts of the crane. The sealing plate 39 prevents dust and moisture from entering the valve groups, extending their service life. The reasonable distribution of the valve groups facilitates operation and maintenance, improving equipment efficiency.

[0029] In this embodiment, the telescopic mechanism assembly 5 includes a telescopic arm 15 and a basic arm 11, with an oilfield hook 29 located below the front end of the telescopic arm 15. The design of the oilfield hook 29 enables the crane to be used for lifting and maintaining oilfield equipment, expanding the application scenarios of the equipment; the combination of the telescopic arm 15 and the basic arm 11 makes the telescopic mechanism assembly 5 compact, facilitating transportation and installation; the design of the oilfield hook 29 meets the requirements of high-intensity operations, ensuring the safety and reliability of the lifting process.

[0030] In this embodiment, the slewing bearing 17 has a diameter of φ1130mm. A left luffing plate 19 is provided on one side of the top of the slewing bearing 17. A mounting plate 25 is provided on one side of the left luffing plate 19. A shock-resistant pressure gauge 26 is provided on the top of the mounting plate 25, and a four-way valve 2 is provided on one side of the mounting plate 25. The shock-resistant pressure gauge 26 is designed to monitor the pressure changes of the hydraulic system in real time, ensuring the safety of equipment operation. The four-way valve 2 enables multi-channel control of the hydraulic system, improving the operational flexibility of the equipment. The combination of the left luffing plate 19 and the mounting plate 25 ensures the stability and reliability of the top structure of the slewing bearing 17.

[0031] In this embodiment, the top of the telescopic arm 15 is provided with a guide wheel 12, and the guide wheel 12 is provided with a guide wheel pin 13. The design of the guide wheel 12 makes the telescopic arm 15 run more smoothly during the extension and retraction process, reducing friction and wear; the setting of the guide wheel pin 13 ensures that the connection between the guide wheel 12 and the telescopic arm 15 is firm and reliable, improving the service life of the equipment; the structural design of the guide wheel 12 is simple, easy to disassemble and maintain, and reduces the cost of use.

[0032] The implementation principle of this embodiment is as follows: The crane is fixed to the working platform by the base 14 to ensure the overall stability of the equipment. A slewing bearing 17 is located at the center of the top of the base 14. An oil-free bearing 20 is installed inside the slewing bearing 17 to reduce friction and improve the smoothness of rotation. When the direction of the crane needs to be adjusted, the slewing bearing 17 starts to work. A central slewing joint 28 is located at the top of the slewing bearing 17, and a slewing reducer assembly 27 is installed on the central slewing joint 28. The slewing reducer assembly 27 drives the slewing bearing 17 to rotate, thereby realizing the horizontal adjustment of the crane. An energy storage assembly (including an AB-type accumulator 35 and an accumulator clamp 36) is located on the other side of the slewing reducer assembly 27 to store and release hydraulic energy, ensuring the stability and efficiency of the rotation process.

[0033] A tower 6 is located at the top center of the slewing bearing 17, and a cover plate 31 is installed on the top of the tower 6. A main shaft 8 is located at the connection between the cover plate 31 and the tower 6, and a first V-shaped stop is installed on the main shaft 8 to limit the range of movement of the main shaft 8. When the crane height needs to be adjusted, the telescopic cylinder 30 starts to work. The telescopic cylinder 30 is installed in the clamping plate 16 and the telescopic speed is controlled by the plate-type one-way balance valve 1 to ensure a smooth telescopic process. The telescopic cylinder 30 drives the telescopic mechanism assembly 5 (including the telescopic boom 15 and the basic boom 11) to extend and retract, thereby adjusting the working height of the crane.

[0034] When the boom angle needs to be adjusted, the luffing cylinder 7 starts to operate. One end of the luffing cylinder 7 is connected to the slewing bearing 17 via the first connecting piece 3, and the other end is connected to the main boom 11 via the second connecting piece 4. The luffing cylinder 7 is fixed by the first cylinder pin 9 and the second cylinder pin 10 to ensure a secure connection. The luffing cylinder 7 drives the boom to adjust its angle, thereby adapting to the operational requirements of different heights and distances.

[0035] Throughout the operation, the hydraulic system is precisely controlled via valve group 1 (38) and valve group 2 (40). Valve group 1 (38) is installed on one side of the rotary reducer assembly (27), and valve group 2 (40) is installed on one side of the tower (6). Valve group 2 (40) is equipped with a sealing plate (39) to protect its internal structure. The hydraulic system achieves multi-channel control through a four-way valve (2), ensuring coordinated operation of all components. A shock-resistant pressure gauge (26) is installed on top of the mounting plate (25) to monitor pressure changes in the hydraulic system in real time, ensuring the safety of equipment operation.

[0036] When a maritime rescue mission is required, the rescue boat winch 32 begins operation. The rescue boat winch 32 is mounted on one side of the tower 6, and its maximum permissible angle under operating conditions is ≤20° to ensure the safety of the rescue mission. When cargo hoisting is required, the hydraulic winch 37 begins operation. The hydraulic winch 37 is mounted on top of the telescopic mechanism assembly 5, and uses the second pulley 34 to raise and lower the rope, enabling the hoisting and release of cargo.

[0037] During the extension and retraction of the telescopic boom 15, the guide wheel 12 begins to operate. The guide wheel 12 is mounted on top of the telescopic boom 15 and fixed by the guide wheel pin 13, ensuring smooth operation during the extension and retraction process. When oilfield equipment needs to be hoisted, the oilfield hook 29 begins to operate. The oilfield hook 29 is installed below the front end of the telescopic boom 15 and is used to hoist oilfield equipment to meet the needs of oilfield operations. Throughout the entire operation, a straight-through pressure injection oil cup 33 is installed on one side of the cover plate 31 to add lubricating oil to the inside of the equipment, reducing friction and extending the equipment's service life.

[0038] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A telescopic crane for a multipurpose rescue boat comprising a base (14), characterised in that: The base (14) top center is provided with slewing bearing (17), the slewing bearing (17) is equipped with oil-free bearing (20), the slewing bearing top is equipped with central slewing joint (28), the central slewing joint (28) is installed with slewing reducer assembly (27), the slewing reducer assembly (27) is equipped with energy storage assembly on the other side, the slewing bearing (17) top center is equipped with tower (6), the tower (6) top is equipped with cover plate (31), the cover plate (31) one side is equipped with straight-through type pressure injection oil cup (33), the straight-through type pressure injection oil cup (33) one side is equipped with first pulley (21), the cover plate (31) and tower (6) junction is equipped with main shaft (8), the main shaft (8) is equipped with first V-shaped stopper, the cover plate (31) top is equipped with clamping plate (16), the clamping plate (16) is equipped with telescopic oil cylinder (30), the telescopic oil cylinder (30) one side is equipped with plate type one-way balance valve (1), the tower (6) one side is equipped with rescue boat winch (32), the rescue boat winch (32) working condition maximum allowable angle ≤20°, the tower (6) top is installed with telescopic mechanism assembly (5), the telescopic mechanism assembly (5) top is equipped with hydraulic winch (37), the hydraulic winch (37) is equipped with second pulley (34).

2. A telescopic crane for a multipurpose rescue boat according to claim 1, characterized in that: The energy storage assembly includes AB type accumulator (35), the AB type accumulator (35) is equipped with accumulator hoop (36), the AB type accumulator (35) top one end is connected with right luffing plate (18).

3. A telescopic crane for a multipurpose rescue boat according to claim 1, characterized in that: The slewing bearing top one side is equipped with luffing oil cylinder (7), the luffing oil cylinder (7) one end is equipped with first connecting piece (3), the other end is equipped with second connecting piece (4), the first connecting piece (3) one end is associated with slewing bearing (17) cooperation, the second connecting piece (4) one end is associated with basic arm (11) cooperation, the first connecting piece (3) is equipped with first oil cylinder pin (9), the second connecting piece (4) is equipped with second oil cylinder pin (10).

4. A telescoping crane for a multipurpose rescue boat according to claim 1, characterized in that: The slewing reducer assembly (27) one side is equipped with No. 1 valve group (38), the tower (6) one side is equipped with No. 2 valve group (40), the No. 2 valve group (40) is equipped with sealing plate (39).

5. A telescoping crane for a multipurpose rescue boat according to claim 1, characterized in that: The telescopic mechanism assembly (5) includes telescopic arm (15) and basic arm (11), the telescopic arm (15) front end below is equipped with oil field hook (29).

6. A telescoping crane for a multipurpose rescue boat according to claim 1, characterized in that: The slewing bearing (17) diameter is φ1130mm, the slewing bearing (17) top one side is equipped with left luffing plate (19), the left luffing plate (19) one side is equipped with mounting plate (25), the mounting plate (25) top is equipped with shockproof pressure gauge (26), the mounting plate (25) one side is equipped with four-way valve (2).

7. A telescoping crane for a multipurpose rescue boat according to claim 1, characterized in that: The telescopic arm (15) top is equipped with guide wheel (12), the guide wheel (12) is equipped with guide wheel pin (13).

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