Pulley mechanism for offshore platform crane

Abstract

The present invention discloses a pulley mechanism for an offshore platform crane, including a crane boom, the crane boom is equipped with a suspension rope system, and also includes a pulley assembly, the suspension rope system passes through the pulley assembly, a fixed shaft is installed on the crane boom, one end of the pulley assembly is sleeved on the fixed shaft, one end of the pulley assembly is matched with the fixed shaft, and the pulley assembly rotates relative to the fixed shaft; the other end of the pulley assembly is movably installed with a suspension rope limiting mechanism through a rotating shaft, and the suspension rope limiting mechanism rotates around the rotating shaft; the center line of the fixed shaft is perpendicular to the center line of the rotating shaft. The beneficial effect of the present invention is that it expands the lifting range of the crane, while reducing the wear and impact of the suspension rope on the pulley assembly, thereby extending the service life.

Description

Technical Field

[0001] The invention relates to the field of crane structure improvement, in particular to a pulley mechanism for an offshore platform crane. Background Art

[0002] Cranes are indispensable equipment in the construction and transportation processes. In the existing crane structure, the pulley mechanism is fixedly installed on the crane boom through a pulley block. In the process of lifting goods, the crane boom is mainly used to bear the weight of the goods, and the pulley block assists the lifting rope to lift the goods. During the lifting process, the edge of the pulley will have a certain limiting effect on the lifting rope. When the goods do not shake, the lifting rope will not cause serious wear and impact on the pulley block, and the service life of the pulley block can be guaranteed.

[0003] However, the crane using the above pulley mechanism has a small lifting radius and is only suitable for lifting work in the vertical direction. When the cargo is not directly under the hook, the pulley block cannot change direction forward, backward, left, right, or right according to the position of the cargo. The staff can only continuously adjust the position of the crane boom according to the position of the cargo to meet the lifting needs. This working method seriously limits the working efficiency and application scope of the crane, especially is not conducive to offshore platform operations.

[0004] In addition, during the operation and construction of offshore platforms, due to the influence of sea breeze and waves, the cargo often shakes when the crane used for offshore platforms lifts the cargo, which causes the lifting rope to continuously rub and impact the pulley block, and this friction and impact will cause serious wear and tear on the pulley block, affecting the service life of the pulley block. If the weight of the cargo is too heavy, the pulley block is prone to breakage due to the excessive impact force of the lifting rope during the shaking of the cargo, which may lead to accidents and threaten the safety of the staff. Summary of the invention

[0005] The purpose of the present invention is to solve the above problems and to design a pulley mechanism for an offshore platform crane.

[0006] The technical solution of the present invention to achieve the above-mentioned object is a pulley mechanism for an offshore platform crane, comprising a crane boom, the crane boom is equipped with a suspension rope system, and also comprises a pulley assembly, the suspension rope system passes through the pulley assembly,

[0007] A fixed shaft is installed on the crane boom, one end of the pulley assembly is sleeved on the fixed shaft, one end of the pulley assembly is matched with the fixed shaft, and the pulley assembly rotates relative to the fixed shaft;

[0008] The other end of the pulley assembly is movably provided with a rope limiting mechanism via a rotating shaft, and the rope limiting mechanism rotates around the rotating shaft;

[0009] The center line of the fixed shaft is perpendicular to the center line of the rotating shaft.

[0010] The rope limiting structure comprises a U-shaped frame, two wire pressing wheels are installed in the U-shaped frame, a wire passing hole is provided on the U-shaped frame, and the two wire pressing wheels are located on both sides of the wire passing hole.

[0011] The suspension rope system comprises a suspension rope and a suspension hook connected to one end of the suspension rope.

[0012] One end of the pulley assembly rotates left and right around a fixed axis.

[0013] The suspension rope limiting mechanism rotates up and down around the rotating shaft.

[0014] Beneficial Effects

[0015] The pulley mechanism for an offshore platform crane manufactured by the technical solution of the present invention realizes the rotation of the pulley block around the fixed axis in the left and right directions through the cooperation between the pulley block and the fixed axis, thereby realizing the technical effect that the lifting angle of the lifting rope and the hook can be variably adjusted in the left and right directions; at the same time, through the structure of the movable connection between the lifting rope limiting mechanism and the pulley block, the rotation of the lifting rope limiting mechanism around the rotating shaft in the front and rear directions of the pulley block is realized, thereby realizing the technical effect that the lifting angle of the lifting rope and the hook can be variably adjusted in the front and rear directions; the staff does not need to constantly adjust the position of the crane boom according to the position of the cargo, which saves working time and improves working efficiency;

[0016] In addition, through the cooperation between the pulley block and the fixed shaft and the active connection between the lifting rope limiting mechanism and the pulley block, the wear and impact of the lifting rope on the pulley block during the shaking of the goods can be effectively buffered, the service life of the pulley block can be extended, the safety hazards caused by the sudden breakage of the pulley block can be avoided, and the safety of the staff can be improved;

[0017] In addition, the technical solution proposed in the present application has a simple structure and does not require changing the structural layout of the existing crane. It only requires adding a fixed shaft and a lifting rope limiting mechanism to the structure of the existing crane. The modification is very convenient, and the structure of the fixed shaft and the lifting rope limiting mechanism is very simple and inexpensive. Therefore, the modification cost for the existing crane is also low, which is suitable for rapid promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the pulley mechanism for an offshore platform crane according to the present invention;

[0019] Figure 2 It is a structural schematic diagram of the side surface of the pulley mechanism for an offshore platform crane according to the present invention;

[0020] Figure 3It is a structural schematic diagram of the connection between the suspension rope limiting mechanism and the pulley assembly of the present invention;

[0021] Figure 4 is a schematic diagram of the exploded structure of the suspension rope restriction mechanism of the present invention;

[0022] In the figure, 1. crane boom; 2. rope system; 3. pulley assembly; 4. rotating shaft; 5. rope limiting mechanism; 6. fixed shaft; 7. U-shaped frame; 8. wire pressing wheel; 9. wire passing hole; 10. rope; 11. hook. DETAILED DESCRIPTION

[0023] The present invention will be described in detail below in conjunction with the accompanying drawings. Figure 1-4 As shown, the innovation of the present application is that a fixed shaft 6 is installed on the crane boom, one end of the pulley assembly is sleeved on the fixed shaft, one end of the pulley assembly is matched with the fixed shaft, and the pulley assembly rotates relative to the fixed shaft; the other end of the pulley assembly is movably installed with a rope limiting mechanism 5 through a rotating shaft 4, and the rope limiting mechanism rotates around the rotating shaft; the center line of the fixed shaft is perpendicular to the center line of the rotating shaft.

[0024] In the present technical solution, the pulley assembly and the fixed shaft form relative rotation after cooperation, that is, the pulley block can rotate left and right relative to the fixed shaft. Since the fixed shaft is installed on the crane boom, the pulley block also swings left and right relative to the crane boom; and the rope limiting mechanism can rotate forward and backward around the rotating shaft relative to the pulley block. Since the rope limiting mechanism and the pulley assembly are movably connected together through the rotating shaft, the rope limiting mechanism and the pulley assembly form relative rotation, that is, the rope limiting mechanism swings forward and backward relative to the crane.

[0025] When the crane is lifting heavy objects, if the objects are not perpendicular to the lifting rope assembly, it can achieve tilted lifting in the left and right and front and back directions, and avoid the rope from being worn out of the rope mouth or wheel assembly, while also expanding the lifting radius of the crane.

[0026] In the present technical solution, since the rope limiting mechanism can rotate relative to the pulley assembly, when the hook impacts the rope limiting mechanism, the rope limiting mechanism itself rotates to reduce the impact on the pulley mechanism, the rope and the limiting system contacting the hook, thereby playing the role of preventing top impact.

[0027] As a preferred solution, further, the rope limiting structure includes a U-shaped frame 7, and two wire pressing wheels 8 are installed in the U-shaped frame. The main function of the two wire pressing wheels is to clamp the rope to ensure that the rope will not have a large friction with the wire passing hole 9 after passing through the wire passing hole, and will not have relative movement and impact with the U-shaped frame, to ensure that when the rope swings or shakes, the rope limiting mechanism can swing with the rope, thereby reducing the impact between the rope and the rope limiting mechanism.

[0028] As a preferred solution, further, the rope system includes a rope 10 and a hook 11 connected to one end of the rope. The rope and the hook are both essential in existing cranes. One end of the rope is connected to the hook, and the other end of the rope is wound around the winch.

[0029] As a preferred solution, further, one end of the pulley assembly rotates left and right around a fixed axis. Since the fixed axis is fixedly installed in the crane boom, the crane boom has a certain limiting effect on the pulley block mounted on the fixed axis. When the pulley block rotates around the fixed axis, the crane boom prevents the pulley block from swinging too far left and right, thereby having a certain protective effect on the pulley block.

[0030] As a preferred solution, further, the rope limiting mechanism rotates up and down around the rotating shaft, and the rope limiting mechanism swings back and forth around the rotating shaft following the angle of the rope, mainly to reduce the impact force of the rope on the pulley block in the front and rear directions during the lifting process, which can not only expand the front and rear lifting angles, but also protect the pulley block and extend its service life.

[0031] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions. The sentence "includes an element defined by ... does not exclude the existence of other identical elements in the process, method, article or device including the element".

[0032] The above technical solutions only reflect the preferred technical solutions of the technical solutions of the present invention. Some changes that may be made to certain parts thereof by technicians in this technical field all reflect the principles of the present invention and fall within the protection scope of the present invention.

Claims

1. A pulley mechanism for an offshore platform crane, comprising a crane boom (1), the crane boom being provided with a suspension rope system (2), and a pulley assembly (3), the suspension rope system passing through the pulley assembly, characterized in that: A fixed shaft (6) is installed on the crane boom, one end of the pulley assembly is sleeved on the fixed shaft, the one end of the pulley assembly is matched with the fixed shaft, and the pulley assembly rotates relative to the fixed shaft; The other end of the pulley assembly is movably mounted with a rope limiting mechanism (5) via a rotating shaft (4), and the rope limiting mechanism rotates around the rotating shaft; The center line of the fixed shaft is perpendicular to the center line of the rotating shaft; The rope limiting mechanism comprises a U-shaped frame (7), two wire pressing wheels (8) are installed in the U-shaped frame, a wire passing hole (9) is provided on the U-shaped frame, and the two wire pressing wheels are located on both sides of the wire passing hole; The suspension rope system comprises a suspension rope (10) and a suspension hook (11) connected to one end of the suspension rope, one end of the pulley assembly rotates left and right around a fixed axis, and the suspension rope limiting mechanism rotates up and down around a rotating axis.

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