Maintenance limiting device for crane roller brake cylinder of offshore platform

Abstract

This utility model discloses a maintenance limiting device for a crane drum brake cylinder on an offshore platform, comprising a base plate, a limiting rod, a pressure block, a pad, and a locking nut. The limiting rod has opposing upper and lower ends, with the lower end of the limiting rod fixedly connected to the upper surface of the base plate. The outer circumference of the limiting rod is threaded, and the limiting rod passes through the central hole of the crane drum brake cylinder on the offshore platform. The pressure block is a hollow columnar structure, used to fit onto the limiting rod and abut against the upper surface of the cover plate of the crane drum brake cylinder on the offshore platform. The pad has a hollow plate-like structure, and the pressure block is used to fit onto the limiting rod and abut against its upper surface. The locking nut is fitted onto the limiting rod and abuts against the upper surface of the pad. This maintenance limiting device for a crane drum brake cylinder on an offshore platform can be used for the maintenance of crane drum brake cylinders on offshore oil production platforms, effectively shortening the maintenance cycle and ensuring operational safety.

Description

Technical Field

[0001] This utility model relates to the field of offshore platform operation tools, and in particular to a maintenance limit device for the brake cylinder of an offshore platform crane drum. Background Technology

[0002] Offshore platforms require cranes, and within the overall structure of a crane, the rollers are an indispensable component, undertaking crucial mechanical transmission functions. Each crane is typically equipped with five rollers, and the brake cylinder, as the core component for roller safety braking, operates through a hydraulic system. It utilizes hydraulic oil pressure to balance the preload of the brake cylinder on the friction plates, thereby achieving smooth roller movement and reliable braking.

[0003] Traditional repair methods, due to limitations in on-site repair equipment, require the entire faulty roller to be disassembled and transported by sea to a land-based factory, which presents the following problems:

[0004] 1. Long cycle: The disassembly, transportation and reassembly process takes about 30 days, resulting in crane downtime losses.

[0005] 2. High cost: The cost of a single sea freight shipment exceeds 50,000 yuan.

[0006] 3. High risk: The transportation process is affected by the weather, and there is a safety hazard when the spring preload is released during disassembly.

[0007] Furthermore, the following technical challenges exist in maintenance: the brake cylinder contains multiple sets of spring discs (or retaining rings), with a preload force of 400-600 kg, making on-site operation difficult. The narrow working space on the offshore platform, without equipment support, makes manual operation prone to spring ejection accidents, posing a safety hazard. Utility Model Content

[0008] The technical problem to be solved by this utility model is to provide a maintenance limit device for the drum brake cylinder of an offshore platform crane.

[0009] The technical solution adopted by this utility model to solve its technical problem is: to construct a maintenance limit device for the brake cylinder of a crane on an offshore platform, including a base plate, a limit rod, a pressure block, a pad, and a locking nut;

[0010] The limiting rod has an upper end and a lower end, the lower end of the limiting rod is fixedly connected to the upper surface of the base plate, the outer circumferential surface of the limiting rod is provided with threads, and the limiting rod is used to pass through the center hole of the brake cylinder of the crane drum of the offshore platform.

[0011] The pressure block is in the shape of a hollow column and is used to be sleeved on the limiting rod to abut against the upper surface of the cover plate of the crane drum brake cylinder on the offshore platform.

[0012] The pad has a hollow plate structure, and the pressure block is used to be sleeved on the limiting rod to abut against the upper surface of the pressure block;

[0013] The locking nut is used to fit onto the limiting rod to abut against the upper surface of the pad.

[0014] In some embodiments, the base plate is a square plate structure or a circular plate structure.

[0015] In some embodiments, the lower end of the limiting rod is welded and fixed to the upper surface of the base plate.

[0016] In some embodiments, the entire outer circumferential surface of the limiting rod is threaded.

[0017] In some embodiments, the limiting rod includes a first rod body and a second rod body that are axially connected. The first rod body is fixedly connected to the upper surface of the base plate. The outer circumferential surface of the first rod body is not threaded, while the outer circumferential surface of the second rod body is threaded.

[0018] In some embodiments, the length of the limiting rod is 18cm-30cm.

[0019] In some embodiments, the pressing block is a square column or a circular column.

[0020] In some embodiments, the pad is a square plate or a circular plate.

[0021] In some embodiments, the limiting rod is a metal rod.

[0022] In some embodiments, the limiting rod is a high-density polyethylene rod or an ultra-high molecular weight polyethylene rod.

[0023] The present invention has the following advantages: the maintenance limit device for the drum brake cylinder of the offshore platform crane can be used for the maintenance of the drum brake cylinder of the offshore oil production platform crane on the offshore platform, which effectively shortens the maintenance cycle and ensures the safety of the operation. Attached Figure Description

[0024] To more clearly illustrate the technical solution of this utility model, the present utility model will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show some embodiments of this utility model and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort. In the drawings:

[0025] Figure 1 This is a structural schematic diagram of the maintenance limit device for the roller brake cylinder of an offshore platform crane in some embodiments of this utility model;

[0026] Figure 2 This is a schematic diagram of the structure of the limiting rod in some embodiments of this utility model;

[0027] Figure 3 This is a schematic diagram of the limiting rod in some other embodiments of this utility model;

[0028] Figure 4 This is a schematic diagram illustrating the application of the maintenance limit device for the roller brake cylinder of a marine platform crane in some embodiments of this utility model. Detailed Implementation

[0029] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "upper," "lower," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or component referred to must have a specific orientation; therefore, they should not be construed as limitations on this utility model.

[0030] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, the component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0031] In the following description, specific details such as particular system structures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the present invention. However, those skilled in the art will understand that the present invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

[0032] To address the issue that traditional maintenance methods cannot meet the operational needs of offshore platforms, this utility model discloses a maintenance limit device for the drum brake cylinder of an offshore platform crane. This device can be used for the maintenance of the drum brake cylinder of an offshore oil production platform crane, providing key technical support for the stable operation of the crane.

[0033] See Figures 1 to 4 In some embodiments, the maintenance limiting device for the crane drum brake cylinder of the offshore platform may include a base plate 10, a limiting rod 20, a pressure block 30, a pad 40, and a locking nut 50.

[0034] The limiting rod 20 has opposing upper and lower ends. The lower end of the limiting rod 20 is fixedly connected to the upper surface of the base plate 10. The outer circumferential surface of the limiting rod 20 is threaded. The limiting rod 20 is used to pass through the central hole of the offshore platform crane drum brake cylinder 100. The pressure block 30 is hollow cylindrical and is used to fit onto the limiting rod 20 to abut against the upper surface of the cover plate 101 of the offshore platform crane drum brake cylinder 100. The pad 40 has a hollow plate structure, and the pressure block 30 is used to fit onto the limiting rod 20 to abut against the upper surface of the pressure block 30. The locking nut 50 is used to fit onto the limiting rod 20 to abut against the upper surface of the pad 40.

[0035] like Figure 4 As shown, the maintenance limit device for the offshore platform crane drum brake cylinder is applied as follows: The offshore platform crane drum brake cylinder 100 is sleeved on the outer periphery of the limit rod 20 and placed on the upper surface of the base plate 10. Then, the pressure block 30 and the pad 40 are installed in sequence, and they are made to make even contact with the cover plate 101 of the offshore platform crane drum brake cylinder 100. Then, the locking nut 50 is installed. Then, the locking nut 50 is slowly adjusted with a wrench to overcome the internal spring force of the offshore platform crane drum brake cylinder 100. Then, the positioning snap ring of the cover plate 101 of the offshore platform crane drum brake cylinder 100 is removed. Finally, the locking nut 50 is loosened to safely disassemble the offshore platform crane drum brake cylinder 100.

[0036] The maintenance limit device for the drum brake cylinder of the offshore platform crane is characterized by convenient assembly, simple structure, and easy use, which can effectively improve the utilization rate and reliability of the crane.

[0037] In some embodiments, the base plate 10 has a square or circular plate structure. The thickness of the base plate 10 can be 1cm-2cm to ensure sufficient support strength. In addition, the lower surface of the base plate 10 can be provided with a corrosion-resistant anti-slip pad to suit the offshore platform operating environment.

[0038] In some embodiments, the base plate 10 can be a metal plate, such as stainless steel. Alternatively, it can be a high-density polyethylene (HDPE) plate, a highly crystalline, non-polar thermoplastic resin copolymerized from ethylene. In its natural state, HDPE is milky white and, in thin sections, somewhat translucent. It exhibits excellent resistance to most household and industrial chemicals, resisting corrosion and dissolution by strong oxidants (concentrated nitric acid), acids, alkalis, salts, and organic solvents (carbon tetrachloride). This polymer is non-hygroscopic and has good water vapor resistance, making it suitable for moisture-proof and seepage-proof applications, particularly in marine environments.

[0039] Alternatively, the base plate 10 can also be made of ultra-high molecular weight polyethylene (UHMWPE). UHMWPE, also known as high-strength, high-modulus polyethylene, is an unbranched linear polyethylene with a molecular weight of over 1.5 million. UHMWPE has excellent mechanical properties, excellent impact resistance, excellent wear resistance, chemical corrosion resistance, and good optical resistance, making it suitable for marine environments.

[0040] Of course, the structure, size and material of the base plate 10 can be selected and set according to actual needs, and no specific limitations are made here.

[0041] In some embodiments, the lower end of the limiting rod 20 is welded and fixed to the upper surface of the base plate 10, for example, by laser welding.

[0042] like Figure 2 As shown, in some embodiments, the entire outer circumferential surface of the limiting rod 20 is threaded.

[0043] like Figure 3 As shown, in some embodiments, the outer circumferential surface of the limiting rod 20 is partially threaded. For example, the limiting rod 20 includes a first rod 21 and a second rod 22 axially connected. The first rod 21 is fixedly connected to the upper surface of the base plate 10. The outer circumferential surface of the first rod 21 is not threaded, while the outer circumferential surface of the second rod 22 is threaded. The length of the first rod 21 can be equal to or greater than the length of the central hole of the offshore platform crane drum brake cylinder 100, which can reduce the impact between the thread and the inner wall of the central hole of the offshore platform crane drum brake cylinder 100. Preferably, the roughness of the outer circumferential surface of the first rod 21 is Ra1.6 or Ra3.2.

[0044] In some embodiments, the length of the limiting rod 20 is 18cm-30cm. For example, the length of the limiting rod 20 can be 18cm, 19cm, 20cm, 21cm, 22cm, 23cm, 24cm, 25cm, 26cm, 27cm, 28cm, 29cm or 30cm. Of course, the length of the limiting rod 20 can be selected and set according to actual needs, and no specific limitation is made here.

[0045] In some embodiments, the diameter of the limiting rod 20 can be 2cm-5cm. For example, the diameter of the limiting rod 20 can be 2cm, 3cm, 4cm or 5cm. The diameter of the limiting rod 20 can be selected and set according to the inner diameter of the center hole of the offshore platform crane drum brake cylinder 100. No specific limitation is made here.

[0046] In some embodiments, the limiting rod 20 is a metal rod, for example, it may be a stainless steel rod. In other embodiments, the limiting rod 20 is a high-density polyethylene rod. High-density polyethylene (HDPE) is a highly crystalline, non-polar thermoplastic resin copolymerized from ethylene. In its natural state, HDPE is milky white and somewhat translucent in thin sections. It has excellent resistance to most household and industrial chemicals, and it resists corrosion and dissolution by strong oxidants (concentrated nitric acid), acids, alkalis, salts, and organic solvents (carbon tetrachloride). This polymer is non-hygroscopic and has good water vapor resistance, making it suitable for moisture-proof and seepage-proof applications, and ideal for marine environments. Alternatively, the limiting rod 20 can be made of ultra-high molecular weight polyethylene (UHMWPE). UHMWPE, also known as high-strength, high-modulus polyethylene, is an unbranched linear polyethylene with a molecular weight of over 1.5 million. UHMWPE has excellent mechanical properties, excellent impact resistance, excellent wear resistance, chemical corrosion resistance, and good optical resistance, making it suitable for marine environments.

[0047] In some embodiments, the pressure block 30 is a square or circular column. Preferably, the pressure block 30 may be a circular column structure, and the outer circumference of the pressure block 30 may be textured or patterned for easy handling and to prevent it from being difficult to handle due to oil or other contaminants. The height of the pressure block 30 may be 5cm-8cm, for example, 5cm, 6cm, 7cm, or 8cm. In some embodiments, the inner diameter of the pressure block 30 may be 2cm-5cm, for example, 2cm, 3cm, 4cm, or 5cm. The inner diameter of the pressure block 30 can be selected and set according to the inner diameter of the central hole of the offshore platform crane drum brake cylinder 100, and is not specifically limited here.

[0048] In some embodiments, the pressing block 30 can be a metal block, such as a stainless steel block. Alternatively, the pressing block 30 can be a high-density polyethylene (HDPE) block. HDPE is a highly crystalline, non-polar thermoplastic resin copolymerized from ethylene. In its natural state, HDPE is milky white and somewhat translucent in thin sections. It exhibits excellent resistance to most household and industrial chemicals, resisting corrosion and dissolution by strong oxidants (concentrated nitric acid), acids, alkalis, salts, and organic solvents (carbon tetrachloride). This polymer is non-hygroscopic and has good water vapor resistance, making it suitable for moisture-proof and seepage-proof applications, and ideal for marine environments.

[0049] Alternatively, the 30 block can also be made of ultra-high molecular weight polyethylene (UHMWPE). UHMWPE, also known as high-strength, high-modulus polyethylene, is an unbranched linear polyethylene with a molecular weight of over 1.5 million. UHMWPE has excellent mechanical properties, excellent impact resistance, excellent wear resistance, chemical corrosion resistance, and good optical resistance, making it suitable for marine environments.

[0050] Of course, the structure, size and material of the pressure block 30 can be selected and set according to actual needs, and no specific limitations are made here.

[0051] In some embodiments, the pad 40 is a square plate or a circular plate. The pad 40 may be a circular plate structure, and the thickness of the pad 40 may be 1cm-2cm. In some embodiments, the inner diameter of the pad 40 may be 2cm-5cm, for example, the inner diameter of the pad 40 may be 2cm, 3cm, 4cm or 5cm. The inner diameter of the pad 40 can be selected and set according to the inner diameter of the center hole of the offshore platform crane drum brake cylinder 100, and is not specifically limited here.

[0052] In some embodiments, the pad 40 can be a metal plate, such as stainless steel. Alternatively, the pad 40 can be a high-density polyethylene (HDPE) plate, a highly crystalline, non-polar thermoplastic resin copolymerized from ethylene. In its natural state, HDPE is milky white and, in thin sections, somewhat translucent. It exhibits excellent resistance to most household and industrial chemicals, resisting corrosion and dissolution by strong oxidants (concentrated nitric acid), acids, alkalis, salts, and organic solvents (carbon tetrachloride). This polymer is non-hygroscopic and has good water vapor resistance, making it suitable for moisture-proof and seepage-proof applications, particularly in marine environments.

[0053] Alternatively, the pad 40 can also be made of ultra-high molecular weight polyethylene (UHMWPE). UHMWPE, also known as high-strength, high-modulus polyethylene, is an unbranched linear polyethylene with a molecular weight of over 1.5 million. UHMWPE has excellent mechanical properties, excellent impact resistance, excellent abrasion resistance, chemical corrosion resistance, and good optical resistance, making it suitable for marine environments.

[0054] In some embodiments, the outer diameter of the pad 40 may be larger than the outer diameter of the pressure block 30.

[0055] Of course, the structure, size and material of the pad 40 can be selected and set according to actual needs, and no specific limitations are made here.

[0056] In other embodiments, the pressure block 30 and the pad 40 may be an integral structure.

[0057] In some embodiments, the locking nut 50 may be an external hexagonal head nut for use with a wrench. The locking nut 50 may be made of a metal material, such as stainless steel. Alternatively, it may be made of high-density polyethylene (HDPE), a highly crystalline, non-polar thermoplastic resin copolymerized from ethylene. In its natural state, HDPE is milky white and somewhat translucent in thin sections. It exhibits excellent resistance to most household and industrial chemicals, resisting corrosion and dissolution by strong oxidants (concentrated nitric acid), acids, alkalis, salts, and organic solvents (carbon tetrachloride). This polymer is non-hygroscopic and has good water vapor resistance, making it suitable for moisture-proof and seepage-proof applications, particularly in marine environments.

[0058] Alternatively, the locking nut 50 can also be made of ultra-high molecular weight polyethylene (UHMWPE). UHMWPE, also known as high-strength, high-modulus polyethylene, is an unbranched linear polyethylene with a molecular weight of over 1.5 million. UHMWPE has excellent mechanical properties, excellent impact resistance, excellent wear resistance, chemical corrosion resistance, and good optical resistance, making it suitable for marine environments.

[0059] In some embodiments, the number of locking nuts 50 may be two to enhance the locking force.

[0060] Of course, the structure, size, material and quantity of the locking nut 50 can be selected and set according to actual needs, and no specific limitation is made here.

[0061] Furthermore, the base plate 10, limit rod 20, pressure block 30, pad 40, and locking nut 50 can also be made of carbon fiber reinforced polymer (CFRP). CFRP possesses high strength and low density, ensuring that the strength of the maintenance limit device for the offshore platform crane drum brake cylinder 100 meets the maintenance requirements, while further reducing its weight, making it easier for offshore platform personnel to handle and operate. Moreover, CFRP has better corrosion resistance than ordinary metals, extending the service life of the maintenance limit device in harsh marine environments with high salt spray, and reducing maintenance and replacement costs due to corrosion.

[0062] The application of this maintenance limit device for the crane drum brake cylinder on an offshore platform has the following advantages:

[0063] Effectively shorten the maintenance cycle: from 30 days to 8 hours.

[0064] Effectively shortens maintenance cycles: single maintenance costs are reduced by 92%, and the traditional 50,000 yuan cost is reduced to zero transportation costs for tool use. Furthermore, the device's components are relatively simple, resulting in lower manufacturing costs.

[0065] Effectively ensures operational safety: The phased release control of spring preload reduces the accident rate by 100%. Practical application in the maintenance of the crane drum brake cylinders on the east and west sides of the Huizhou 25-3 platform in the Huizhou Oilfield Operation Area of ​​CNOOC (China) Limited Shenzhen Branch has shown that the maintenance of the crane drum brake cylinders on the offshore platform can be completed using this maintenance limit device, avoiding the need to completely disassemble the crane drum and send it ashore for maintenance. The maintenance process is safe and controllable.

[0066] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. A device for limiting the maintenance of a brake cylinder of a crane drum of an offshore platform, characterized in that, It includes a base plate (10), a limiting rod (20), a pressure block (30), a pad (40), and a locking nut (50); The limiting rod (20) has an upper end and a lower end, the lower end of the limiting rod (20) is fixedly connected to the upper surface of the base plate (10), the outer circumferential surface of the limiting rod (20) is provided with threads, and the limiting rod (20) is used to pass through the center hole of the crane drum brake cylinder (100) of the offshore platform. The pressure block (30) is hollow columnar and is used to be sleeved on the limiting rod (20) to abut against the upper surface of the cover plate (101) of the offshore platform crane drum brake cylinder (100); The pad (40) has a hollow plate structure, and the pressure block (30) is used to be sleeved on the limiting rod (20) to abut against the upper surface of the pressure block (30); The locking nut (50) is fitted onto the limiting rod (20) to abut against the upper surface of the pad (40).

2. The maintenance limit device for the drum brake cylinder of an offshore platform crane according to claim 1, characterized in that, The base plate (10) has a square plate structure or a circular plate structure.

3. The offshore platform crane roller brake cylinder service stopper device of claim 1, wherein, The lower end of the limiting rod (20) is welded and fixed to the upper surface of the base plate (10).

4. The offshore platform crane roller brake cylinder service stopper device of claim 1, wherein, The outer circumference of the limiting rod (20) is entirely threaded.

5. The offshore platform crane roller brake cylinder service stopper device of claim 1, wherein, The limiting rod (20) includes a first rod body and a second rod body that are axially connected. The first rod body is fixedly connected to the upper surface of the base plate (10). The outer circumference of the first rod body is not threaded, while the outer circumference of the second rod body is threaded.

6. The offshore platform crane roller brake cylinder service stopper device of claim 1, wherein, The length of the limiting rod (20) is 18cm-30cm.

7. The maintenance limit device for the drum brake cylinder of an offshore platform crane according to claim 1, characterized in that, The pressing block (30) is a square column or a circular column.

8. The offshore platform crane roller brake cylinder service stopper device of claim 1, wherein, The pad (40) is square or round.

9. The offshore platform crane roller brake cylinder service stopper device of claim 1, wherein, The limiting rod (20) is a metal rod.

10. The offshore platform crane roller brake cylinder service stopper device of claim 1, wherein, The limiting rod (20) is a high-density polyethylene rod or an ultra-high molecular weight polyethylene rod.

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