Displacement drive device, system and method for hoisting pulley assembly of quay crane trolley

Abstract

This invention provides a displacement drive device, system, and method for a quay crane trolley lifting pulley assembly, relating to the field of displacement drives for quay crane trolley lifting pulley assemblies. It aims to improve the problem that existing quay crane trolleys, during long-reach operations, suffer from difficulties in quickly and stably controlling the spreader's attitude due to variations in the deflection of the lifting wire rope and the relatively soft nature of the upper frame. The method involves fixing both ends of a chain to the trolley frame, with a sprocket mounted on the pulley trolley and meshing with the chain. When the sprocket rotates, the fixed chain converts the rotational motion into linear motion, driving the pulley trolley and pulley block to slide along the rails, achieving integration of the drive mechanism and the trolley, resulting in a short power transmission path and fast response. When the left and right trolleys slide in opposite directions, a torsional torque is applied to the upper frame of the spreader via the lifting wire rope, quickly and stably controlling the spreader's attitude and overcoming the adverse effects of the lifting wire rope deflection and the relatively soft upper frame during long-reach operations.

Description

Technical Field

[0001] This invention relates to the field of displacement drive for hoisting pulley assembly of quay crane trolley, and more specifically, to a displacement drive device, system and method for hoisting pulley assembly of quay crane trolley. Background Technology

[0002] In the field of port container cranes, with the trend towards larger ships, the separate racking system capable of simultaneously lifting two 40-foot containers has become widely used. To meet the flexibility requirements of dual-container operations, the separate structural design of this type of rack results in a certain degree of flexibility. Meanwhile, to adapt to the operational needs of ultra-large ships, the fore-and-aft reach of port container cranes is constantly increasing, leading to a corresponding increase in the length of the hoisting wire rope, resulting in more significant changes in the hoisting wire rope deflection.

[0003] To control the rotation and torsional sway of the spreader during operation, existing technologies typically install anti-rotation devices on the head beam of the front main beam, limiting the spreader's torsional freedom through mechanical constraints or friction braking. However, this anti-rotation device is indirectly connected to the spreader via a long hoisting wire rope. As the length of the hoisting wire rope increases, the deflection changes more pronounced. Combined with the deformation caused by the inherent softness of the detachment frame, the control effect applied by the anti-rotation device weakens and lags during transmission, making it difficult to quickly and stably control the spreader's attitude precisely. In practice, operators often need to make repeated adjustments to complete the box-setting operation, which not only affects work efficiency but also fails to meet the increasing demands for stability in continuous operations. Summary of the Invention

[0004] The following provides a brief overview of one or more aspects to offer a basic understanding of them. This overview is not an exhaustive summary of all conceived aspects, nor is it intended to identify key or decisive elements of all aspects, nor to define the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form to prepare for the more detailed descriptions that follow.

[0005] The present invention includes, for example, providing a displacement drive device, system, and method for a quay crane trolley lifting pulley assembly, which can improve the problem that existing quay crane trolleys, when operating over long reach, are unable to quickly and stably control the attitude of the lifting device due to changes in the deflection of the lifting wire rope and the relatively soft characteristics of the upper frame.

[0006] The embodiments of the present invention can be implemented as follows: An embodiment of the present invention provides a displacement drive device for a quay crane trolley lifting pulley assembly. The lifting pulley assembly includes a pulley block and a lifting wire rope wound on the pulley block. It includes a slide rail, a pulley trolley, a chain, and a sprocket. The slide rail is fixedly mounted on the trolley frame and extends along the trolley's land-sea side. The pulley trolley is slidably mounted on the slide rail, and the pulley block is mounted on the pulley trolley. The chain extends along the trolley's land-sea side, and both ends of the chain are fixed to the trolley frame to form a fixed path. The sprocket is mounted on the pulley trolley and driven to rotate by a power source. The sprocket meshes with the chain. When the sprocket rotates, it drives the pulley trolley to reciprocate along the slide rail by meshing with the chain.

[0007] In addition, the quay crane trolley lifting pulley assembly displacement drive device provided in the embodiments of the present invention may also have the following additional technical features: Optionally, the power source is a planetary reducer, which is fixedly installed on the pulley trolley, and the output end of the planetary reducer is connected to the sprocket drive.

[0008] Optionally, the sprocket is a double-row sprocket, the chain is a double-row chain, and the double-row sprocket meshes with the double-row chain.

[0009] Optionally, the double-row chains are in two sets, and the two sets of double-row chains are respectively fixed on the trolley frame and located on both sides of the pulley trolley; the double-row sprockets are in two sets, and the two sets of double-row sprockets are coaxially mounted on the pulley trolley and located on both sides of the pulley trolley; the two sets of double-row sprockets respectively mesh with the corresponding two sets of double-row chains.

[0010] Optionally, the displacement drive device for the hoisting pulley assembly of the quay crane trolley further includes a structural support, a connecting member, a tail screw, and a locking nut. The two ends of each set of double-row chains are respectively connected and fixed to the connecting member. One end of the tail screw is threadedly connected to the connecting member, and the other end of the tail screw is threadedly connected to the structural support fixed on the trolley frame. The locking nut is connected to the end of the thread of the tail screw. The tension of the chain is adjusted by rotating the tail screw.

[0011] Optionally, the pulley trolley and the slide rail are connected by a sliding pair, the sliding pair including a slider plate disposed at the bottom of the pulley trolley and a slider embedded in the slider plate, the slider making sliding contact with the surface of the slide rail.

[0012] Optionally, the slider is made of copper.

[0013] Optionally, the slider is provided with a lubrication channel for injecting a lubricating medium into the contact surface between the slider and the slide rail.

[0014] Optionally, the slide rail includes a first slide rail and a second slide rail arranged side by side at intervals; the slider includes a first slider and a second slider; the first slider has a bottom surface and a side surface, the bottom surface of the first slider is in sliding contact with the upper surface of the first slide rail, and the side surface of the first slider is in clearance fit with the side surface of the first slide rail; the second slider has a bottom surface, and the bottom surface of the second slider is in sliding contact with the upper surface of the second slide rail.

[0015] Embodiments of the present invention also provide a quay crane trolley lifting pulley assembly displacement drive system, including a quay crane trolley lifting pulley assembly displacement drive device and a control system; The quay crane trolley lifting pulley assembly displacement drive device consists of two sets; the two sets of the quay crane trolley lifting pulley assembly displacement drive devices are arranged side by side along the trolley travel direction; Alternatively, the quay crane trolley lifting pulley assembly displacement drive device is four sets, and the four sets of the quay crane trolley lifting pulley assembly displacement drive device are arranged in a rectangular array along the trolley travel direction and the trolley travel direction. The control system is used to detect the attitude of the spreader. When the control system detects that the spreader is tilted, it controls the pulley trolleys of the two sets of the quay crane trolley lifting pulley assembly displacement drive devices arranged side by side along the trolley travel direction to move in opposite directions along the slide rail. It also controls the pulley trolleys of the two sets of the quay crane trolley lifting pulley assembly displacement drive devices arranged side by side along the trolley direction to move synchronously, so as to drive the spreader to twist along the trolley travel direction by the lifting wire rope wound on the pulley block.

[0016] An embodiment of the present invention also provides a method for displacement driving of a quay crane trolley lifting pulley assembly, implemented using a quay crane trolley lifting pulley assembly displacement driving system. The number of the quay crane trolley lifting pulley assembly displacement driving devices is at least two sets, and the at least two sets of quay crane trolley lifting pulley assembly displacement driving devices are arranged along the trolley's travel direction; the method includes the following steps: The system detects the attitude of the lifting device; when the control system detects that the lifting device is tilted, it controls the drive device set along the direction of travel of the trolley to drive its respective pulley trolley to move in the opposite direction along the slide rail, so as to drive the lifting device to the frame to rotate through the lifting wire rope wound on the pulley block.

[0017] The beneficial effects of the quay crane trolley lifting pulley assembly displacement drive device, system, and method according to embodiments of the present invention include, for example: The gantry crane trolley's lifting pulley assembly displacement drive device fixes both ends of the chain to the trolley frame to form a fixed path, and the sprocket is installed on the pulley trolley and meshes with the chain. When the power source drives the sprocket to rotate, since the chain is stationary, the sprocket directly converts the rotational motion into linear motion through meshing with the chain, driving the pulley trolley and the pulley block mounted on it to slide synchronously along the slide rail. This achieves integrated operation of the drive mechanism and the pulley trolley, resulting in a short power transmission path and fast response speed. When the left and right pulley trolleys slide in opposite directions, a torsional torque is applied to the upper frame of the spreader through the lifting wire rope, achieving rapid and stable control of the spreader's rotation and anti-torsion function. This effectively overcomes the adverse effects of changes in the deflection of the lifting wire rope and the relatively soft characteristics of the upper frame on attitude control under long-distance working conditions. At the same time, the sprocket and chain drive has the advantages of good installation tolerance and strong load-bearing capacity, which can be well matched with the heavy-duty working conditions of the gantry crane.

[0018] The displacement drive system for the hoisting pulley assembly of the quay crane trolley, including the aforementioned device, can improve the problem that existing quay crane trolleys, when operating over long reach, suffer from difficulties in quickly and stably controlling the attitude of the spreader due to changes in the deflection of the hoisting wire rope and the relatively soft characteristics of the upper frame.

[0019] The displacement drive method for the hoisting pulley assembly of the quay crane trolley, implemented using the above-mentioned system, can improve the problem that existing quay crane trolleys, when operating over long reach, are unable to quickly and stably control the attitude of the spreader due to changes in the deflection of the hoisting wire rope and the relatively soft characteristics of the upper frame. Attached Figure Description

[0020] The above-described features and advantages of the present invention will be better understood after reading the following detailed description of embodiments of the present disclosure in conjunction with the accompanying drawings. In the drawings, components are not necessarily drawn to scale, and components having similar related characteristics or features may have the same or similar reference numerals.

[0021] Figure 1 This is a schematic diagram of the displacement drive system for the hoisting pulley assembly of the quay crane trolley provided in an embodiment of the present invention; Figure 2 This is a front view of the four groups of displacement drive devices for the hoisting pulley assembly of the quay crane trolley provided in an embodiment of the present invention; Figure 3 This is a top view of the four sets of displacement drive devices for the hoisting pulley assembly of the quay crane trolley provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the planetary reducer and sprocket assembly on the pulley trolley in the displacement drive device for the hoisting pulley assembly of the quay crane trolley provided in an embodiment of the present invention. Figure 5 This is a schematic diagram of the installation of the auxiliary sprocket on the pulley trolley in the displacement drive device of the hoisting pulley assembly of the quay crane trolley provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the sliding pair in the displacement drive device of the hoisting pulley assembly of the quay crane trolley provided in an embodiment of the present invention.

[0022] Icons: Hoisting pulley assembly displacement drive system - 10; Hoisting pulley assembly displacement drive device - 11; Sliding pair - 99; Slide rail - 100; First slide rail - 110; Second slide rail - 120; Slider - 130; First slider - 131; Second slider - 132; Pulley trolley - 200; Chain - 300; Sprocket - 400; Auxiliary sprocket - 410; Power source - 500; Planetary reducer - 510; Structural support - 600; Connecting component - 610; Tail screw - 620; Anti-loosening nut - 630; Hoisting pulley assembly - 700; Pulley block - 710; Hoisting wire rope - 720; Lifting device mounting - 800. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. It should be noted that the aspects described below with reference to the accompanying drawings and specific embodiments are merely exemplary and should not be construed as limiting the scope of protection of the present invention in any way.

[0024] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," "outer," or "vertical" appear, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed when in use, and does not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0025] At the same time, it should be noted that the terms "first" and "second" are used only for distinguishing descriptions and should not be interpreted as indicating or implying relative importance.

[0026] In the description of this invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an integral connection, or a detachable connection; 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, or a connection within two components, etc. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0027] The existing quay crane lifting pulley assembly 700 is fixed to the trolley frame, and the slewing and torsion resistance rely on the anti-slewing device on the front beam head crossbeam. With the application of double 40-foot separate upper frames and the increase in front and rear reach, the deflection of the lifting wire rope 720 and the relatively soft characteristics of the upper frame make it difficult for traditional devices to quickly and stably control the attitude of the spreader. In this embodiment, the two ends of the chain 300 are fixed to the trolley frame, and the sprocket 400 is installed on the pulley trolley 200 and driven by the power source 500. The rotation is converted into linear motion by the sprocket 400 rolling on the fixed chain 300, driving the overall displacement of the pulley trolley 200 and the lifting pulley assembly 700 it carries. This achieves direct and active control of the spreader attitude and effectively solves the problem of spreader torsion under long reach conditions.

[0028] The following is combined with Figures 1 to 6 The displacement drive device 11 for the hoisting pulley assembly of the quay crane trolley provided in this embodiment will be described in detail.

[0029] Please refer to Figure 1 , Figure 2 and Figure 3 An embodiment of the present invention provides a displacement drive device 11 for a quay crane trolley lifting pulley assembly. The lifting pulley assembly 700 includes a pulley block 710 and a lifting wire rope 720 wound on the pulley block. It includes a slide rail 100, a pulley trolley 200, a chain 300, and a sprocket 400. The slide rail 100 is fixedly mounted on the trolley frame and extends along the land-sea side of the trolley. The pulley trolley 200 is slidably mounted on the slide rail 100. A pulley block 710 is provided on the trolley; a chain 300 extends along the land and sea side of the trolley, and both ends of the chain 300 are fixed to the trolley frame to form a fixed path; a sprocket 400 is mounted on the pulley trolley 200 and driven to rotate by a power source 500, and the sprocket 400 meshes with the chain 300; wherein, when the sprocket 400 rotates, the sprocket 400 drives the pulley trolley 200 to slide back and forth along the slide rail 100 by meshing with the chain 300.

[0030] When the sprocket 400 rotates, since the two ends of the chain 300 are fixed, the sprocket 400 converts the rotational motion into linear motion through meshing with the chain 300 and the steering action of the auxiliary sprocket 410, driving the pulley trolley 200 to slide back and forth along the slide rail 100. Compared with the traditional structure that fixes the drive source to the trolley frame, this embodiment integrates the drive mechanism directly onto the pulley trolley 200, making the position adjustment of the lifting pulley assembly 700 more direct and intuitive, and enabling quick realization of the spreader's rotation and anti-torsion functions. At the same time, the sprocket 400 and chain 300 transmission method has the advantages of good installation fault tolerance, i.e., low installation accuracy requirements and strong load-bearing capacity, which can better match the heavy-load operation conditions of the quay crane, and solves the technical problem that traditional anti-rotation devices are difficult to effectively control the spreader's attitude due to the deflection of the lifting wire rope 720 and the relatively soft characteristics of the upper frame under long-reach conditions.

[0031] It should be noted that the lifting pulley assembly 700 refers to the complete pulley assembly in the quay crane lifting system used to wind the lifting wire rope 720 and transmit lifting force. Its function is to guide the direction of the lifting wire rope 720 and transmit the lifting force to the spreading gear. The lifting pulley assembly 700 includes multiple pulley groups 710, each pulley group 710 being a specific set of pulleys (usually a combination of multiple pulleys). Unlike traditional quay cranes where the components (pulley groups) of the lifting pulley assembly 700 are fixed to the trolley frame, in this embodiment, each pulley group 710 constituting the lifting pulley assembly 700 is installed on a movable pulley trolley 200. By driving the pulley trolley 200 to move along the slide rail 100, the pulley groups 710 on it are displaced as a whole, thereby changing the relative positions of each pulley group 710 in space, enabling the lifting pulley assembly 700 to achieve its overall displacement function.

[0032] Reference Figure 3 and Figure 4 In this embodiment, the power source 500 is a planetary reducer 510, which is fixedly installed on the pulley trolley 200. The output end of the planetary reducer 510 is connected to the sprocket 400 for transmission.

[0033] The planetary reducer 510 features smooth transmission, compact structure, small size, and strong load-bearing capacity. It can achieve high torque output within the limited space of the quay crane trolley, leaving ample space for maintenance and making spare parts easy to find and highly interchangeable. This improves the reliability and maintainability of the entire drive unit. It forms a synergistic effect with the 400 sprocket and 300 chain transmission method to jointly ensure stable operation.

[0034] Reference Figure 2 and Figure 3 In this embodiment, the sprocket 400 is a double-row sprocket, the chain 300 is a double-row chain, and the double-row sprocket and the double-row chain mesh.

[0035] Double-row sprockets refer to two rows of sprockets arranged side-by-side, that is, two rows of sprockets arranged at 40° angles side-by-side to form a double-row sprocket. Double-row chains refer to two rows of chains arranged side-by-side, that is, two rows of chains arranged at 30° angles side-by-side to form a double-row chain.

[0036] Compared to a single-row structure, the meshing structure of double-row sprockets and double-row chains offers greater load-bearing capacity and smoother transmission. It effectively distributes load, reduces contact stress on individual tooth surfaces, and extends the service life of transmission components. Furthermore, the double-row chain structure provides the structural basis for achieving 300° synchronous operation of the chains on both sides, jointly ensuring the straightness of the trolley's movement.

[0037] Reference Figure 2 and Figure 3In this embodiment, there are two sets of double-row chains, which are fixed on the trolley frame and located on both sides of the pulley trolley 200; there are two sets of double-row sprockets, which are coaxially mounted on the pulley trolley 200 and located on both sides of the pulley trolley 200; the two sets of double-row sprockets mesh with the corresponding two sets of double-row chains.

[0038] The symmetrical arrangement on both sides ensures a symmetrical distribution of the force exerted by the drive unit on the pulley trolley 200, avoiding the generation of eccentric load torque; the coaxial installation ensures the synchronous rotation of the sprockets 400 on both sides. The two sets of double-row chains on the same drive shaft effectively guarantee the straightness of the pulley trolley 200 by ensuring the synchronous operation of the chains 300 on both sides, thereby enhancing the stability of the drive unit.

[0039] Reference Figure 2 , Figure 3 and Figure 5 In this embodiment, the quay crane trolley lifting pulley assembly displacement drive device 11 also includes an auxiliary sprocket 410. The auxiliary sprocket 410 is disposed on both sides of the sprocket 400 and is distributed in a triangular structure with the sprocket 400. The auxiliary sprocket 410 meshes with the chain 300 and is used to guide the chain 300 led out from the sprocket 400 along the horizontal direction of the trolley to form a fixed path.

[0040] Specifically, sprocket 400 is a double-row sprocket, and auxiliary sprocket 410 is a double-row auxiliary sprocket 410, which meshes with the double-row chain.

[0041] Reference Figure 2 and Figure 3 In this embodiment, the displacement drive device 11 of the hoisting pulley assembly of the quay crane trolley also includes a structural support 600, a connecting member 610, a tail screw 620, and a locking nut 630. The two ends of each double-row chain are respectively connected to the connecting member 610. One end of the tail screw 620 is threadedly connected to the connecting member 610, and the other end of the tail screw 620 is threadedly connected to the structural support 600 fixed on the trolley frame. The locking nut 630 is connected to the end of the thread of the tail screw 620. The tail screw 620 adjusts the tension of the chain 300 by rotation.

[0042] Both ends of the chain 300 are connected to the tail screw 620 via connectors 610. The tail screw 620 is threadedly connected to the structural support 600 fixed to the trolley frame and is equipped with a lock nut 630. By rotating the tail screw 620, the tension of the chain 300 can be precisely adjusted. This compensates for the plastic elongation of the chain 300 after long-term use and ensures the balance of tension on both sides of the chain 300, thereby ensuring the synchronization of the double-row chain operation. The lock nut 630 effectively prevents the screw from loosening under vibration conditions. This adjustment structure ensures the synchronization of the operation of the two chains 300.

[0043] Reference Figure 6 In this embodiment, the pulley trolley 200 and the slide rail 100 are connected by a sliding pair. The sliding pair includes a slider 130 plate disposed at the bottom of the pulley trolley 200 and a slider 130 embedded in the slider 130 plate. The slider 130 slides in contact with the surface of the slide rail 100.

[0044] The sliding fit between the pulley trolley 200 and the slide rail 100 is realized, which ensures that the pulley trolley 200 has a small offset distance in the vertical track direction and enhances the stability of the pulley trolley 200 operation; the slider 130 is embedded in the card plate and the two are fitted with a clearance fit to ensure disassembly and assembly, which facilitates disassembly and replacement and improves the convenience of maintenance.

[0045] In this embodiment, the slider 130 is made of copper. Copper has excellent anti-friction properties and self-lubricating properties, forming an excellent friction pair with the steel slide rail 100, which can effectively reduce sliding friction. At the same time, copper is relatively soft, so even if wear occurs, it mainly wears on the slider 130 rather than the slide rail 100, protecting the more expensive and more difficult-to-replace trolley frame slide rail 100, greatly reducing maintenance costs, and demonstrating a deep understanding of friction pair materials.

[0046] In this embodiment, a lubrication channel is provided on the slider 130, which is used to inject lubricating medium into the contact surface between the slider 130 and the slide rail 100.

[0047] The lubrication channel is used to inject lubricating medium into the contact surface between the slider 130 and the slide rail 100, forming a stable lubricating film between the contact surfaces. This converts sliding friction into internal friction of the lubricating medium, significantly reducing the coefficient of friction, decreasing sliding resistance, and ensuring smooth sliding. Simultaneously, the lubricating film absorbs operational shocks and vibrations, reducing vibration transmission to the trolley frame, improving driver comfort, and reducing environmental noise pollution. This structure, in conjunction with the slider 130, achieves the technical effects of significantly reducing friction and improving sliding smoothness.

[0048] Reference Figure 3 and Figure 4 In this embodiment, the slide rail 100 includes a first slide rail 110 and a second slide rail 120 arranged side by side at intervals; the slider 130 includes a first slider 131 and a second slider 132; the first slider 131 has a bottom surface and a side surface, the bottom surface of the first slider 131 slides in contact with the upper surface of the first slide rail 110, and the side surface of the first slider 131 is in clearance fit with the side surface of the first slide rail 110; the second slider 132 has a bottom surface, and the bottom surface of the second slider 132 slides in contact with the upper surface of the second slide rail 120.

[0049] The first slider 131 has a bottom surface and a side surface. The bottom surface slides in contact with the upper surface of the first slide rail 110 to bear the vertical load, and the side surface has a clearance fit with the side surface of the first slide rail 110 to provide lateral guidance. The second slider 132 only slides in contact with the upper surface of the second slide rail 120, and only bears the vertical load without participating in guidance. The first slider 131 plays a dual role of support and guidance, while the second slider 132 only plays a supporting role. This ensures accurate guidance of the pulley trolley 200 in the running direction, and avoids jamming caused by manufacturing errors or thermal deformation by reducing sliding constraints. It achieves a balance between guiding accuracy and smooth operation, reflecting the refined optimization of the sliding pair design.

[0050] Reference Figure 1 and Figure 3 The embodiments of the present invention also provide a quay crane trolley lifting pulley assembly displacement drive system 10, including a quay crane trolley lifting pulley assembly displacement drive device 11 and a control system. The hoisting pulley assembly displacement drive device 11 of the quay crane trolley consists of two sets; the two sets of hoisting pulley assembly displacement drive devices 11 are arranged side by side along the direction of the trolley's travel. Alternatively, the hoisting pulley assembly displacement drive device 11 of the quay crane trolley can be in four groups, and the four groups of hoisting pulley assembly displacement drive devices 11 of the quay crane trolley can be arranged in a rectangular array along the trolley travel direction and the crane travel direction. The control system is used to detect the attitude of the spreader. When the control system detects that the spreader is tilted, it controls the pulley trolleys 200 of the two sets of quay crane trolley lifting pulley assembly displacement drive devices 11 arranged side by side along the trolley travel direction to move in opposite directions along the slide rail 100. It also controls the pulley trolleys 200 of the two sets of quay crane trolley lifting pulley assembly displacement drive devices 11 arranged side by side along the trolley direction to move synchronously, so as to drive the spreader to twist along the trolley travel direction by the lifting wire rope wound on the pulley block.

[0051] Reference Figure 3 ,by Figure 3 The relative positions are explained as follows: "Traffic direction of the large trolley" is along the vertical direction, and "Traffic direction of the small trolley" is along the horizontal direction. If the quay crane trolley lifting pulley assembly displacement drive device 11 has a two-set layout, then the two sets of quay crane trolley lifting pulley assembly displacement drive devices 11 are arranged with two sets on the left and two sets on the right, either vertically or vertically. If the quay crane trolley lifting pulley assembly displacement drive device 11 has four sets, then it is arranged according to... Figure 3 The layout settings are shown.

[0052] The pulley trolleys 200 of the two sets of hoisting pulley assemblies, which are arranged side by side along the direction of travel of the main trolley, move in opposite directions along the slide rail 100, so as to... Figure 3The relative positions in the text refer to the fact that the upper and lower groups on the left move in opposite directions, and the upper and lower groups on the right move in opposite directions.

[0053] The pulley trolleys 200 of the two sets of quay crane trolley lifting pulley assemblies displacement drive devices 11, which are arranged side by side along the trolley direction, move synchronously. Figure 3 The relative positions in the text refer to the fact that the two groups on the top side move in the same direction, and the two groups on the bottom side move in the same direction. For example, Figure 3 In the middle, the two upper groups move in the direction indicated by arrow A, while the two lower groups move in the direction indicated by arrow B. Conversely, the two upper groups move in the direction indicated by arrow B, while the two lower groups move in the direction indicated by arrow A.

[0054] Through the aforementioned adjustment method, the hoisting wire rope 720 wound on the pulley block 710 can drive the spreader frame 800 to twist, thereby adjusting the spreader's posture. This coordinated control enables the hoisting wire rope 720 to generate a torsional torque on the spreader frame 800, allowing direct and intuitive control of the spreader's rotation, quickly and accurately correcting spreader skew, and achieving direct control of the spreader's rotation and anti-torsion functions. This solves the technical problem of traditional anti-rotation devices being unable to effectively control the spreader's posture due to changes in the deflection of the hoisting wire rope 720 and the relatively soft characteristics of the frame. It plays a crucial role in the stable, efficient, and continuous operation of port container cranes, significantly improving the success rate of container handling.

[0055] An embodiment of the present invention also provides a method for displacement driving of a quay crane trolley lifting pulley assembly 700, implemented using a quay crane trolley lifting pulley assembly displacement driving system 10. The method comprises at least two sets of quay crane trolley lifting pulley assembly displacement driving devices 11, arranged along the trolley's travel direction, and includes the following steps: The system detects the attitude of the lifting device; when the control system detects that the lifting device is tilted, it controls the two sets of drive devices set opposite to each other along the direction of travel of the trolley to drive their respective pulley trolleys 200 to move in opposite directions along the slide rail 100, so as to drive the lifting device to the frame 800 to rotate through the lifting wire rope 720 wound on the pulley block 710.

[0056] The pulley trolleys 200 on both sides of the traveling direction of the main vehicle achieve opposite displacement movements in the sea and land directions, which drives the pulley block 710 on the trolley to move accordingly. The lifting wire rope 720 wound on the pulley block 710 and the upper frame 800 of the lifting device drives the upper frame 800 of the lifting device to move accordingly, thereby achieving the purpose of rotation and anti-torsion function of the lifting device, and fully reproduces the core working process of the present invention.

[0057] This embodiment provides a displacement drive device for a lifting pulley assembly 700. The device includes a movable pulley trolley 200140 and a slide rail 100 fixedly mounted on a trolley frame. The pulley trolley 200140 is equipped with a lifting pulley assembly 700130 (i.e., a pulley group 710 consisting of multiple pulleys) for winding the lifting wire rope 720. The pulley trolley 200140 carries the lifting pulley assembly 700130 and slides along the slide rail 100120 under the drive of a drive mechanism, thereby displacing the entire lifting pulley assembly 700130 and achieving displacement of the lifting pulley assembly 700. By driving the pulley trolley 200 to move, the lifting pulley assembly 700 on the pulley trolley 200 is displaced, ultimately controlling the lifting device via the lifting wire rope 720.

[0058] According to the quay crane trolley lifting pulley assembly displacement drive device 11 provided in this embodiment, the working principle of the quay crane trolley lifting pulley assembly displacement drive device 11 includes: The chain 300 is fixed at both ends to the trolley frame to form a fixed path. The sprocket 400 is mounted on the pulley trolley 200 and driven to rotate by the planetary reducer 510. When the sprocket 400 rotates, since the chain 300 is stationary, the sprocket 400 converts the rotational motion into linear motion through meshing with the chain 300, driving the pulley trolley 200 to slide back and forth along the slide rail 100. The pulley trolley 200 is equipped with a pulley block 710 that constitutes the lifting pulley assembly 700. The lifting wire rope 720 is wound around the pulley block 710 and connected to the upper frame of the lifting device 800. When the control system detects that the lifting device is tilted, it controls the pulley trolleys 200 on the left and right sides to move in opposite directions along the slide rail 100, causing the pulley blocks 710 on both sides to generate relative displacement. The lifting wire rope 720 applies a torsional torque to the upper frame of the lifting device 800, thereby achieving the anti-torsional function of the lifting device. Through a unique transmission method where the chain 300 is fixed and the drive mechanism moves with the trolley, direct and precise control of the position of the lifting pulley assembly 700 is achieved.

[0059] The quay crane trolley lifting pulley assembly displacement drive device 11 provided in this embodiment has at least the following advantages: The chain 300 is fixed at both ends to the trolley frame, and the sprocket 400 is installed on the pulley trolley 200, converting rotational motion into linear motion and driving the pulley trolley 200, which carries the lifting pulley assembly 700, to move. When the left and right trolleys slide in opposite directions, a torsional torque is applied to the upper frame 800 of the lifting device through the lifting wire rope 720, realizing direct control of the rotation and anti-torsion function of the lifting device, and solving the technical problem that traditional anti-rotation devices are difficult to stably control the attitude of the lifting device under long extension distances.

[0060] The planetary reducer 510 features a compact structure and high load-bearing capacity, achieving high torque output within a limited space and offering high interchangeability. The sprocket 400 and chain 300 offer good installation tolerance and high load-bearing capacity, suitable for heavy-duty conditions. Two sets of double-row chains on the same drive shaft, working in conjunction with the tail screw 620, adjust the tension to ensure synchronous operation of the chains 300 on both sides, guaranteeing the straightness of the trolley's movement.

[0061] The slider 130 and the steel slide rail 100 form an excellent friction pair, with wear mainly occurring on the easily replaceable slider 130. The lubrication channel injects a medium to form a lubricating film, significantly reducing the coefficient of friction, minimizing vibration transmission, improving operational comfort, and reducing noise. The slide rail 100 is machined after welding to ensure good straightness.

[0062] The drive mechanism is integrated into the pulley trolley 200. The planetary reducer 510 is small in size and highly interchangeable. The slider 130 and the clamping plate are fitted together for easy disassembly and assembly. The tension of the chain 300 can be precisely adjusted, significantly improving the convenience of maintenance.

[0063] Rapid and precise adjustment of the spreader's posture significantly improves the accuracy and success rate of container positioning, playing a key role in the stable, efficient, and continuous operation of the quay crane.

[0064] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A displacement drive device for a hoisting pulley assembly of a quay crane trolley, the hoisting pulley assembly comprising a pulley block and a hoisting wire rope wound on the pulley block, characterized in that, include: The slide rail is fixedly mounted on the trolley frame and extends along the land and sea sides of the trolley. A pulley trolley, which is slidably mounted on the slide rail, and the pulley assembly is provided on the pulley trolley; A chain extends along the land and sea sides of the vehicle, and both ends of the chain are fixed to the vehicle frame to form a fixed path; And a sprocket, which is mounted on the pulley trolley and driven to rotate by a power source, and the sprocket meshes with the chain; When the sprocket rotates, the sprocket engages with the chain, driving the pulley trolley to slide back and forth along the slide rail.

2. The displacement drive device for the hoisting pulley assembly of the quay crane trolley according to claim 1, characterized in that: The power source is a planetary reducer, which is fixedly installed on the pulley trolley, and the output end of the planetary reducer is connected to the sprocket drive.

3. The displacement drive device for the hoisting pulley assembly of the quay crane trolley according to claim 1, characterized in that: The sprocket is a double-row sprocket, the chain is a double-row chain, and the double-row sprocket meshes with the double-row chain.

4. The displacement drive device for the hoisting pulley assembly of the quay crane trolley according to claim 3, characterized in that: The double-row chains are in two sets, and the two sets of double-row chains are respectively fixed on the trolley frame and located on both sides of the pulley trolley; the double-row sprockets are in two sets, and the two sets of double-row sprockets are coaxially mounted on the pulley trolley and located on both sides of the pulley trolley; the two sets of double-row sprockets respectively mesh with the corresponding two sets of double-row chains.

5. The displacement drive device for the hoisting pulley assembly of the quay crane trolley according to claim 4, characterized in that: The displacement drive device for the hoisting pulley assembly of the quay crane trolley also includes a structural support, a connecting component, a tail screw, and a lock nut. The two ends of each set of double-row chains are respectively connected and fixed to the connecting component. One end of the tail screw is threadedly connected to the connecting component, and the other end of the tail screw is threadedly connected to the structural support fixed on the trolley frame. The lock nut is connected to the end of the thread of the tail screw. The tension of the chain is adjusted by rotating the tail screw.

6. The displacement drive device for the hoisting pulley assembly of the quay crane trolley according to claim 1, characterized in that: The pulley trolley and the slide rail are connected by a sliding pair. The sliding pair includes a slider plate disposed at the bottom of the pulley trolley and a slider embedded in the slider plate. The slider slides in contact with the surface of the slide rail.

7. The displacement drive device for the hoisting pulley assembly of the quay crane trolley according to claim 6, characterized in that: The slider is made of copper.

8. The displacement drive device for the hoisting pulley assembly of the quay crane trolley according to claim 7, characterized in that: The slider is provided with a lubrication channel, which is used to inject lubricating medium into the contact surface between the slider and the slide rail.

9. The displacement drive device for the hoisting pulley assembly of the quay crane trolley according to claim 6, characterized in that: The slide rail includes a first slide rail and a second slide rail arranged side by side at intervals; the slider includes a first slider and a second slider; the first slider has a bottom surface and a side surface, the bottom surface of the first slider slides in contact with the upper surface of the first slide rail, and the side surface of the first slider is in clearance fit with the side surface of the first slide rail; the second slider has a bottom surface, and the bottom surface of the second slider slides in contact with the upper surface of the second slide rail.

10. A displacement drive system for a hoisting pulley assembly of a quay crane trolley, characterized in that, Includes the displacement drive device and control system for the hoisting pulley assembly of the quay crane trolley as described in any one of claims 1-9; The quay crane trolley lifting pulley assembly displacement drive device consists of two sets; the two sets of the quay crane trolley lifting pulley assembly displacement drive devices are arranged side by side along the trolley travel direction; Alternatively, the quay crane trolley lifting pulley assembly displacement drive device is four sets, and the four sets of the quay crane trolley lifting pulley assembly displacement drive device are arranged in a rectangular array along the trolley travel direction and the trolley travel direction. The control system is used to detect the attitude of the spreader. When the control system detects that the spreader is tilted, it controls the pulley trolleys of the two sets of the quay crane trolley lifting pulley assembly displacement drive devices arranged side by side along the trolley travel direction to move in opposite directions along the slide rail. It also controls the pulley trolleys of the two sets of the quay crane trolley lifting pulley assembly displacement drive devices arranged side by side along the trolley direction to move synchronously, so as to drive the spreader to twist along the trolley travel direction by the lifting wire rope wound on the pulley block.

11. A method for driving the displacement of a quay crane trolley lifting pulley assembly, implemented using the quay crane trolley lifting pulley assembly displacement driving system as described in claim 10, wherein the number of the quay crane trolley lifting pulley assembly displacement driving devices is at least two sets, and the at least two sets of the quay crane trolley lifting pulley assembly displacement driving devices are arranged along the trolley travel direction; characterized in that... Includes the following steps: Detect the attitude of the lifting device; When the control system detects that the lifting device is tilted, it controls the drive device set along the direction of travel of the trolley to drive its respective pulley trolley to move in the opposite direction along the slide rail, so as to drive the lifting device to the frame to rotate through the lifting wire rope wound on the pulley block.

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