Luffing rope pre-tightening tool for hoisting equipment and operating method

Abstract

The application discloses a luffing rope pre-tightening tool for a hoisting device, which comprises a hoisting device body, an arm support pivoted at one end of the hoisting device body, a luffing winch rotatably installed on the hoisting device body, a connecting assembly, a lower back-pack pulley block, a luffing rope, a force transmission device and a moving mechanism, one end of the connecting assembly is connected to the top of the arm support, and the other end is rotatably provided with an upper back-pack pulley block; the lower back-pack pulley block is fixed on the hoisting device body; the luffing rope is connected to the upper back-pack pulley block and the lower back-pack pulley block and is used for changing the distance between the upper back-pack pulley block and the lower back-pack pulley block; the force transmission device is used for detachably connecting with the connecting assembly of the hoisting device; the connecting assembly is connected with the luffing rope; the moving mechanism is detachably connected with the force transmission device, the moving mechanism can drive the force transmission device to move, so that the connecting assembly can exert tension on the luffing rope. It can be seen that the tool can exert tension on the luffing rope, so as to avoid the occurrence of the flash joint of the luffing rope.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of engineering machinery, in particular to a luffing rope pre-tightening tool for a hoisting device and an operating method. BACKGROUND

[0002] For a crawler crane with an A-type frame, when its boom is raised, the bottom layer of luffing ropes in the luffing winch is not pre-tightened (manually wound and slackened), and the steel wire rope is loosely wound on the outside of the luffing winch. When the boom head is subjected to the maximum force (the boom is in a working state, and is picking up or hoisting a load), the bottom layer of luffing ropes is bulged under force, which eventually leads to flash seams in the upper layer. During hoisting construction, the luffing ropes are not unloaded, and are always in a tension state under the force of the boom self-weight and the hoisted load, which makes the luffing ropes at the flash seam position prone to strand, crushing and even wire breakage, and poses a great safety hazard, seriously threatening construction safety.

[0003] Therefore, how to apply pre-tightening force to the luffing ropes of the luffing winch to avoid the problem of flash seams in the luffing ropes on the outside of the luffing winch is a technical problem to be solved by those skilled in the art. SUMMARY

[0004] Therefore, how to apply pre-tightening force to the luffing ropes of the luffing winch to avoid the problem of flash seams in the luffing ropes on the outside of the luffing winch is a technical problem to be solved by those skilled in the art.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0006] A luffing rope pre-tightening tool for a hoisting device, comprising a hoisting device body, a boom pivotally connected to one end of the hoisting device body, and a luffing winch rotatably installed to the hoisting device body, comprising:

[0007] A connecting assembly connected to the top of the boom at one end and rotatably installed with an upper back-pack pulley block at the other end;

[0008] A lower back-pack pulley block fixed to the hoisting device body;

[0009] A luffing rope connecting the upper back-pack pulley block and the lower back-pack pulley block, and used for changing the distance between the upper back-pack pulley block and the lower back-pack pulley block;

[0010] A force transmission device used for detachable connection with the connecting assembly, and connected with the luffing rope;

[0011] A moving mechanism detachably connected with the force transmission device, and capable of moving the force transmission device, so that the connecting assembly can apply tension to the luffing rope.

[0012] Optionally, in the above-mentioned luffing rope pre-tensioning tool for lifting equipment, the force transmission device includes:

[0013] a clamping portion, the clamping portion being detachably connected to the connecting assembly;

[0014] The connecting portion is connected to the clamping portion and is detachably connected to the moving mechanism.

[0015] Optionally, in the above-mentioned luffing rope pre-tensioning tool for lifting equipment, the clamping portion includes a clamping claw;

[0016] Alternatively, the clamping portion includes a first ear plate and a second ear plate arranged at an interval; one end of the first ear plate is connected to the connecting portion, and the other end is a free end; one end of the second ear plate is connected to the connecting portion, and the other end is a free end; the gap between the free end of the first ear plate and the free end of the second ear plate is used to accommodate the connecting assembly, and the clamping portion also includes a first stopper for preventing the connecting assembly from escaping from the gap.

[0017] Optionally, in the above-mentioned luffing rope pre-tensioning tool for lifting equipment, the connecting assembly includes a steel wire rope;

[0018] Alternatively, the connecting assembly includes a single pull plate and a double pull plate connected to each other, the connection position of the single pull plate and the double pull plate is a first position, and the force transmission device is connected to the first position.

[0019] Optionally, in the above-mentioned luffing rope pre-tensioning tool for lifting equipment, the single pull plate is provided with a fifth through hole at the first position, the double pull plate is provided with a sixth through hole at the first position, and a second stopper is provided between the fifth through hole and the sixth through hole to prevent the single pull plate from being disconnected from the double pull plate;

[0020] The second stopper includes a second pin shaft and a second pin, the second pin shaft passes through the fifth through hole and the sixth through hole, and the two ends of the second pin shaft respectively protrude from the two axial sides of the double pull plate along the fifth through hole to form a first protrusion and a second protrusion, the first protrusion is provided with a third opening, and the second protrusion is provided with a fourth opening; the third opening and the fourth opening are respectively provided with the second pin.

[0021] Optionally, in the above-mentioned luffing rope pre-tensioning tool for lifting equipment, the single pull plate is provided with a fifth through hole at the first position, the double pull plate is provided with a sixth through hole at the first position, and a second stopper is provided between the fifth through hole and the sixth through hole to prevent the single pull plate from being disconnected from the double pull plate;

[0022] The second stop member includes a third pin shaft and a third pin, the third pin shaft passes through the fifth through hole and the sixth through hole, and both ends of the third pin shaft respectively protrude from the two side surfaces of the double pull plate along the axial direction of the fifth through hole to form a third protrusion and a fourth protrusion, the third protrusion is provided with a fifth opening and a seventh opening, and the fourth protrusion is provided with a sixth opening and an eighth opening; the fifth opening and the sixth opening are respectively provided with the third pin, or the seventh opening and the eighth opening are respectively provided with the third pin; the second stop member can also be used as the first stop member.

[0023] Optionally, in the above-mentioned luffing rope pre-tensioning tool for lifting equipment, the moving mechanism includes:

[0024] a sling, wherein the sling is connected to the force transmission device via a flexible connector;

[0025] The lifting force display device is used to display the lifting force of the connecting component.

[0026] An operating method of the luffing rope pre-tightening tool for lifting equipment includes the following steps:

[0027] S1: Connect the force transmission device to the connecting component and fix the two;

[0028] S2: The moving mechanism moves to control the luffing winch to release the luffing rope to the first target layer and the first target circle;

[0029] S3: When the moving mechanism reaches the hoisting load value, the luffing winch is controlled to retract the luffing rope. Meanwhile, the moving mechanism moves at a speed that ensures the tension of the luffing rope is within a specified range until the pre-tightened luffing rope reaches the second target layer and the second target loop, at which point the luffing rope is stopped.

[0030] S4: The moving mechanism moves until the backpack connected to the connecting assembly falls to a specified position.

[0031] Optionally, in the above-mentioned operating method of the luffing rope pre-tensioning tool for lifting equipment, the connecting assembly includes a single pull plate and a double pull plate connected to each other, the connection position of the single pull plate and the double pull plate is a first position, and the force transmission device is connected to the first position; when the second stopper includes a second pin shaft and a second pin;

[0032] Before step S1, the method further includes step S0: removing the second stopper;

[0033] Step S1 specifically includes: placing the single pull plate and the double pull plate at the first position in the gap between the first ear plate and the second ear plate, and then passing through the first stopper;

[0034] Step S4 specifically includes: the moving mechanism moves while ensuring that the arm pull plate of the lifting equipment correctly falls into the pull plate seat until the backpack connected to the connecting assembly falls to a specified position;

[0035] After step S4, the method further includes step S5: removing the tooling, and using a second stopper to fix the single pull plate and the double pull plate, and the first stopper remains on the force transmission device.

[0036] Optionally, in the above-mentioned operating method of the luffing rope pre-tensioning tool for lifting equipment, the connecting assembly includes a single pull plate and a double pull plate connected to each other, the connection position of the single pull plate and the double pull plate is a first position, and the force transmission device is connected to the first position; when the second stopper includes a third pin shaft and a third pin;

[0037] Before step S1, the method further includes step S0: removing the second stopper;

[0038] Step S1 specifically includes: placing the single pull plate and the double pull plate at the first position in the gap between the first ear plate and the second ear plate, and then passing through the second stopper;

[0039] Step 4 specifically includes: the moving mechanism moves while ensuring that the arm pull plate of the lifting equipment correctly falls into the pull plate seat until the backpack connected to the connecting assembly falls to a specified position;

[0040] After step S4, the method further includes step S5: removing the tooling and fixing the single pull plate and the double pull plate with a second stopper.

[0041] Optionally, in the above-mentioned method for operating the luffing rope pre-tensioning tool, the first target layer in step S2 is the bottom layer, and the first target circle is the last half circle;

[0042] And / or, the second target layer in step S3 is the second winding layer, and the second target turn is the third turn.

[0043] As can be seen from the above technical solution, the present invention can indirectly convert the force directly applied to the crane's connecting assembly through the mobile mechanism into a preload force applied to the luffing rope, thereby preventing the luffing rope from being wound around the outside of the luffing winch and preventing the luffing rope from becoming untied, crushed, or even broken, thereby reducing safety hazards of the crane and improving its safety. It should be noted that the detachable connection between the force transmission device, the connecting assembly, and the mobile mechanism allows the present invention to meet the preload requirements of different equipment, with high assembly and disassembly efficiency and strong applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0045] Figure 1 This is a schematic structural diagram of a force transmission device according to a first embodiment of the present invention;

[0046] Figure 2 This is a structural diagram of a force transmission device according to a second embodiment of the present invention;

[0047] Figure 3 This is a structural diagram of a force transmission device connected to a connection assembly according to an embodiment of the present invention;

[0048] Figure 4 This is a structural diagram of a tool connection assembly according to an embodiment of the present invention;

[0049] Figure 5 Schematic diagram of the connection position of the lower single pull plate and the double pull plate in embodiment 2 of the present invention Figure 1 ;

[0050] Figure 6 Schematic diagram of the connection position of the lower single pull plate and the double pull plate in embodiment 2 of the present invention Figure 2 ;

[0051] Figure 7 This is a structural diagram of the connection position of the lower single pull plate and the double pull plates in embodiment 1 of the present invention;

[0052] Figure 8 This is a schematic structural diagram of a lifting device before the luffing rope is pre-tightened according to an embodiment of the present invention;

[0053] Figure 9 for Figure 8 A partial enlarged view of the

[0054] Figure 10 for Figure 8 Schematic diagram of the luffing winch accommodating the luffing rope;

[0055] Figure 11 This is a structural schematic diagram of a luffing rope pre-tightening process of a lifting device according to an embodiment of the present invention;

[0056] Figure 12 for Figure 11 Schematic diagram of the luffing winch accommodating the luffing rope;

[0057] Figure 13 This is a schematic structural diagram of a lifting device after the luffing rope is pre-tightened according to an embodiment of the present invention;

[0058] Figure 14 for Figure 13 Schematic diagram of the luffing winch accommodating the luffing rope.

[0059] in:

[0060] 1. Force transmission device; 11. Clamping portion; 12. Connecting portion; 111. First ear plate; 112. Second ear plate;

[0061] 113. First pin; 114. First pin; 13. Connector; 131. First part;

[0062] 132. Part 2; 133. Limiting member;

[0063] 2. Moving mechanism; 21. Lifting device; 3. Single pull plate; 4. Double pull plates;

[0064] 51. Second pin; 52. Second pin;

[0065] 61, third pin; 611, fifth opening; 612, seventh opening; 613, sixth opening;

[0066] 614, eighth opening; 62, third pin; 7, flexible connector;

[0067] 8. Lifting equipment body; 81. Boom; 82. Luffing winch; 83. Upper bag pulley block;

[0068] 84. Lower backpack pulley assembly; 85. Luffing rope. DETAILED DESCRIPTION

[0069] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0070] In the description of the invention, it should be noted that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the invention is usually placed, and are only for the convenience of describing the invention and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the invention. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0071] The crawler crane includes a hoisting system and a luffing system, the hoisting system includes a main hoist and a sub hoist, when the ropes are not aligned, the pre-tightening is usually performed by multiple times of hoisting the weight, also known as self-pre-tightening. When the luffing winch 83 of the crawler crane is initially wound, especially for the crane with an A-type frame, the boom 81 is not luffed and is always in a relaxed state, and there is no effective method to pre-tighten the bottom rope. It is known that the luffing winch 83 includes a cylindrical drum, flanges are arranged on opposite sides of the luffing winch 83 (i.e. two sides of the drum), the luffing rope 85 is wound between the outside of the luffing winch 83 and the two flanges, and one end of the luffing rope 85 is detachably fixed to the flange of the luffing winch 85 or the drum of the luffing winch 85. The luffing rope 85 is first closely arranged in a layer along the axial direction of the luffing winch 83, and then switched to another layer close to the layer. According to the side view of the whole machine, it can be seen that when the initial winding is performed, the luffing rope 85 between the upper back package pulley set 82 and the lower back package pulley set 84 is in a relaxed state, at this time, the luffing rope 85 is difficult to be closely wound to the outside of the luffing winch 83 (usually the luffing rope 85 is closely wound to the luffing winch 83, and the luffing rope 85 needs to have sufficient pre-tightening force). When the goods are shipped, the equipment is switched to a transportation state, and after arriving at the customer's site, it is switched to a working state. Accompanying the switching of the transportation and working states of the crawler crane, the bottom luffing rope 85 is always relaxed, and cannot be pre-tightened like the hoisting of the steel wire rope. The luffing rope can be composed of a steel wire rope or a composite fiber, but is not limited thereto, and the specific material of the luffing rope 85 is not limited.

[0072] Usually, the hoisting luffing winch 82 is a steel wire rope which is connected with a hook after passing through the pulley at the top of the boom 81, and the hoisting luffing winch 82 is used to realize the lifting and falling of the weight hung on the hook by lifting the hook. The luffing winch 82 is used to change the position of the boom 81. Specifically, the crane with an A-type frame (small tonnage crane, relatively small rated hoisting capacity) and the crane with a mast (large tonnage crane) have different structures, resulting in different pre-tightening methods.

[0073] As Figures 1 to 14As shown, an embodiment of the present invention provides a luffing rope pre-tightening tool for lifting equipment, which can solve the problem of flashing of the luffing rope 85.

[0074] First, the luffing rope pre-tightening tool for lifting equipment includes a lifting equipment body 8, a boom 81 pivoted relative to one end of the lifting equipment body 8, a luffing winch 82 rotatably mounted to the lifting equipment body 8, a connecting assembly, a lower backpack pulley group 84, a luffing rope 85, a force transmission device 1 and a moving mechanism 2, wherein one end of the connecting assembly is connected to the top of the boom 81, and the other end is rotatably mounted with an upper backpack pulley group 83; the lower backpack pulley group 84 is fixed to the lifting equipment body 8; the luffing rope 85 connects the upper backpack pulley group 83 and the lower backpack pulley group 84, so as to change the distance between the upper backpack pulley group 83 and the lower backpack pulley group 84; the force transmission device 1 is used to be detachably connected to the connecting assembly of the crane; the moving mechanism 2 is detachably connected to the force transmission device 1. It should be noted that the moving mechanism 2 and the force transmission device 1 can be directly detachably connected or indirectly detachably connected (that is, the connection between the two requires a detachably connected structural member); the moving mechanism 2 can drive the force transmission device 1 to move in the height direction of the crane. For details on the moving direction, see Figure 4 , so that the connecting assembly can apply tension to the variable amplitude rope 85. Preferably, the angle between the moving direction of the force transmission device 1 and the length direction of the connecting assembly is greater than 0°, which can ensure that the moving mechanism 2 effectively applies force to the connecting assembly, and since the connecting assembly is connected to the variable amplitude rope 85 through the upper backpack pulley group 83, the moving mechanism 2 drives the force transmission device 1 to move, and the force applied to the connecting assembly acts on the variable amplitude rope 85 indirectly connected to the force transmission device 1, thereby applying tension to the variable amplitude rope 85. It should be noted that the main moving direction is the height direction, and during the movement process, it can be moved along the height direction and tilted in other directions; it can also be moved parallel to the height direction. The tooling structure is simple and easy to operate. It should be noted that the schematic diagram of the length direction of the connecting assembly is shown in detail. Figure 1 .

[0075] It should be noted that the force transmission device 1 is the tooling body of the variable-length rope pretensioning tooling for lifting equipment, which is used to connect the moving mechanism 2 and the connecting component. The force applied to the force transmission device 1 is transmitted to the connecting component through the movement of the moving mechanism 2, which plays a role in force conduction. Therefore, the tooling body is named force transmission device 1; the moving mechanism 2 is the power source for the force applied to the connecting component, and the application of force to the connecting component is achieved through the movement of the moving mechanism 2.

[0076] As can be seen, the present invention can indirectly convert the force directly applied to the crane's connecting assembly by the mobile mechanism 2 into tension on the luffing rope 85. This can prevent the luffing rope 85 from flashing when wrapped around the outside of the luffing winch 82, and can prevent the luffing rope 85 from becoming loose, crushed, or even broken. This can reduce safety hazards and improve the safety of the crane. It should be noted that the detachable connection between the force transmission device 1, the connecting assembly, and the mobile mechanism 2 allows the present invention to meet the preload requirements of different equipment, with high assembly and disassembly efficiency and strong applicability.

[0077] In specific implementation, the force transmission device 1 includes a clamping part 11 and a connecting part 12. The clamping part 11 is detachably connected to the connecting assembly; the connecting part 12 is connected to the clamping part 11 and is detachably connected to the moving mechanism 2. The detachable connection facilitates connection and facilitates storage, movement, transportation and other operations when not connected.

[0078] In a specific implementation, the clamping portion 11 includes a clamping jaw. It should be noted that the clamping jaw includes a clamping jaw body and an external power source. The clamping jaw body relies on an external power source (such as pneumatic, electric, hydraulic, etc.) to drive the opening and closing of the clamping jaw, thereby achieving the grasping and releasing of the connection component. It should be noted that the external power source can be pneumatic, electric or hydraulic, etc., but is not limited to these. The specific structure of the external power source can be specifically designed by those skilled in the art according to actual needs. Alternatively, see Figure 1 The clamping portion 11 includes two spaced-apart lugs 111 and 112. The first lug 111 is connected to the connecting portion 12 at one end and is free at the other. The second lug 112 is connected to the connecting portion 12 at one end and is free at the other end. The gap between the free ends of the first and second lugs 111 and 112 accommodates the connecting assembly. The clamping portion 11 also includes a first stopper to prevent the connecting assembly from escaping the gap. When the clamping portion 11 is connected to the connecting assembly, a pre-tightening force is applied to the luffing rope 85. After the pre-tightening of the luffing rope 85 is completed, the clamping portion 11 is disconnected from the connecting assembly.

[0079] In specific implementation, the connecting part 12 and the clamping part 11 are hingedly connected. The hingedly connection facilitates the folding of the two parts when not in use, thereby reducing the volume, facilitating storage or transportation; and in the process of applying the connecting part 12 to the pre-tensioning of the amplitude-changing rope 85, the hingedly connection enables the mobile mechanism 2 to move more flexibly, with better precision control, facilitating operation. The hingedly connection has a certain flexibility, can absorb vibration and impact, reduce the impact on other parts, and protect other components in the tool. It should be noted that when the clamping part 11 includes a clamping jaw, the connecting part 12 is hingedly connected with the clamping jaw. When the clamping part 11 includes the first ear plate 111 and the second ear plate 112, the end of the first ear plate 111 and the second ear plate 112 connected with the connecting part 12 is provided with a space for accommodating the connecting part 12, the connecting part 12 is provided with a seventh through hole, the first ear plate 111 is provided with an eighth through hole, the second ear plate 112 is provided with a ninth through hole, a connecting rod passes through the seventh through hole, the eighth through hole and the ninth through hole, the end of one end of the connecting rod covers the through hole adjacent to it, and the other end is provided with a nut (wherein the connecting rod is provided with a second thread matched with the first thread of the nut) or a pin (wherein the connecting rod is provided with an opening matched with the pin) for fixing the connecting rod. However, the specific structure of the hingedly connected connecting part 12 and clamping part 11 can be designed according to actual needs by those skilled in the art.

[0080] In specific implementation, the clamping part 11 is provided with two, and each clamping part 11 is connected with a respective connecting part 12; wherein a connecting piece 13 is arranged between the two clamping parts 11, and / or Figure 1 a connecting piece 13 is arranged between the two connecting parts 12. The connecting piece 13 can prevent the two clamping parts 11 from converging towards each other during movement, thereby affecting the pre-tensioning of the amplitude-changing rope 85. It should be noted that the number of clamping parts 11 is determined by the number of steel wires or parallel and non-collinear pull plates in the connecting assembly. Typically, the number of steel wires or parallel and non-collinear pull plates in the clamping part 11 is two, but it is not limited to this. When the number is multiple, the number of clamping parts 11 corresponds to multiple, and the connecting piece 13 is arranged between the adjacent two clamping parts 11 and / or the adjacent two connecting parts 12.

[0081] In specific implementation, the size of the connecting piece 13 along its length direction is adjustable, which is adjusted in real time according to the distance between the steel wires or the distance between the pull plates in the connecting assembly in actual work, so that the tooling is more adaptable and can be applied to track cranes of different models; wherein, the connecting piece 13 includes a telescopic rod, which is a sleeve type structure, i.e. a plurality of pipes with gradually decreasing diameters are nested with each other to form a telescopic structure, when it is needed to increase the length of the telescopic rod, the outermost pipe is pulled or pushed manually, so that the inner pipes are sequentially extended; when the telescopic rod reaches the required length, the telescopic rod is fixed at this position through a locking device (such as friction locking, screw locking, button locking, etc.); when it is needed to shorten the length of the telescopic rod, the inner pipes are sequentially retracted through an unlocking device, and finally restored to the shortest state. Alternatively, the connecting piece 13 includes a first part 131, a second part 132 and a limiting piece 133, the first part 131 is provided with a plurality of third through holes, the second part 132 is provided with a plurality of fourth through holes, the first part 131 and the second part 132 at least partially overlap, and the first part 131 and the second part 132 can move relative to each other, when moved to the target position, at least two third through holes of the first part 131 can correspond to two fourth through holes on the second part 132, and the third through hole and the fourth through hole at each corresponding position are provided with the limiting piece 133 to prevent the relative movement of the first part 131 and the second part 132, wherein, see Figure 1 , the first part 131 is a strip-shaped plate member, the second part 132 includes two strip-shaped plate members which are arranged in parallel and have a gap, the strip-shaped plate member of the first part 131 can be accommodated in the gap, the first part 131 is provided with three third through holes, the two strip-shaped plate members of the second part 132 are respectively provided with three fourth through holes, the positions of the third through holes and the fourth through holes are adjusted, and the two limiting pieces 133 are limited to achieve the purpose of adjusting and fixing the first part 131 and the second part 132 along the length direction. But not limited to this, the specific structure form of the connecting piece 13 can be designed according to actual needs by those skilled in the art.

[0082] In specific implementations, the connection assembly includes a steel wire rope connected to the variable-length rope 85 via the upper backpack pulley assembly 83; alternatively, the connection assembly includes a single pull plate 3 and a double pull plate 4, one end of which is connected to the variable-length rope 85 via the upper backpack pulley assembly 83, and the other end is connected to the top of the boom 81. The connection position of the single pull plate 3 and the double pull plate 4 is the first position, and the force transmission device 1 is connected to the first position. It should be noted that the connection assembly can have only one first position, or two or more first positions. When there are two first positions, the connection assembly includes a single pull plate 3, a double pull plate 4, and a single pull plate 3 connected in sequence, or includes a double pull plate 4, a single pull plate 3, and a double pull plate 4 connected in sequence. However, not every first position can be connected to the force transmission device 1. In this case, the force transmission device 1 is connected to the first position near the upper backpack pulley assembly 83. When there are multiple first positions, the connecting assembly includes multiple single pull plates 3 and multiple double pull plates 4 arranged alternately in sequence, but not every first position can be connected to the force transmission device 1. At this time, the force transmission device 1 is connected to the first position close to the upper backpack pulley group 83.

[0083] In specific implementation, the mobile mechanism 2 includes a sling 21 and a load-carrying force display device, wherein the sling 21 is directly or indirectly connected to the force transmission device 1 through a flexible connector 7. When the tooling is not in use, the flexible connector 7 (such as a sling or a chain) is easy to store. When the tooling is in use, the flexible connector 7 can be freely bent, twisted or stretched in multiple directions to adapt to complex movements, and its uniform force can reduce stress concentration. In addition, the connection of the flexible connector 7 usually does not require complex machining or assembly tools, and the installation is simple and quick. Figure 4 The connection portion 12 is provided with a through hole for passing through the flexible connector 7, but this is not limited to this embodiment. The specific structure of the connection portion 12 for connecting the flexible connector 7 can be designed by those skilled in the art based on actual needs. The load force display device is used to display the tension of the connection assembly (i.e., the tensile force applied to the connection assembly). This facilitates the tooling to control the application of preload force to the luffing rope 85 within a specified range during use. At the same time, it prevents the tooling from applying non-compliant forces to the connection assembly during the entire tooling operation. Because the tooling's application of preload force to the luffing rope 85 is a dynamic process, it is important not only to ensure that the final preload force achieved by the luffing rope 85 meets the requirements, but also to ensure that the forces applied to each component are compliant during operation. For example, if the expected preload force of a single-rope luffing rope 85 is 1 ton, the luffing ratio of the preloaded machine is 14, and the transmission efficiency is 0.9, the value 1*14*0.9 = 12.6 ton. The load value displayed by the load force display device should be controlled around 12.6 ton, with an allowance of ±2% for error. The moving mechanism 2 is generally a separate auxiliary crane. For example, the moving mechanism 2 is an auxiliary crane, the hoist 21 is a hook of the auxiliary crane, and the auxiliary crane is provided with a load capacity display device.

[0084] In specific implementations, the crawler crane tonnage is in the 135t to 200t class to prevent the boom from being lifted during tooling operations if the tonnage is too small. However, this is not a limitation, and the specific tonnage of the crawler crane can be designed by those skilled in the art based on actual needs.

[0085] An embodiment of the present invention provides an operating method based on the above-mentioned luffing rope pre-tightening tool for lifting equipment, comprising the following steps:

[0086] S1: Connect the force transmission device 1 to the connecting assembly and fix the two together;

[0087] S2: The moving mechanism 2 moves, and the crane lowers the luffing rope 85 to the first target layer and the first target circle outside the luffing winch 82. Figure 8 and Figure 10 ;

[0088] S3: The moving mechanism 2 moves the sling 21 to apply tension until the load value is reached. The luffing rope 85 of the pre-tightened luffing winch 82 in the crane is retracted. At the same time, the moving mechanism 2 moves at a speed that ensures that the tension value of the luffing rope 85 is within the specified range. Figure 11 and Figure 12 Until the pre-tightened luffing rope 85 reaches the second target layer and the second target circle, then stop retracting the luffing rope 85. Figure 14 ;

[0089] S4: The moving mechanism 2 continues to move until the backpack connected to the connecting assembly falls to a specified position.

[0090] It can be seen that the operating method of the luffing rope pre-tightening tooling for lifting equipment provided by the embodiment of the present invention can indirectly convert the force directly applied to the connecting assembly of the crane by the mobile mechanism 2 into tension applied to the luffing rope 85, thereby preventing the luffing rope 85 from being wound around the outside of the luffing winch 82 and preventing the luffing rope 85 from being loose, crushed, or even broken, thereby reducing safety hazards of the crane and improving the safety of the crane. It should be noted that due to the detachable connection between the force transmission device 1, the connecting assembly, and the mobile mechanism 2, the present invention can be adapted to the pre-tightening requirements of different equipment, and the assembled disassembly efficiency is high and the applicability is strong.

[0091] In specific implementation, step S2 and step S3 further include: observing the magnitude of the lifting force of the sling 21 through a lifting force display device.

[0092] In specific implementation, the first target layer in step S2 is the lowest layer, and the first target turn is the last half turn. In a pre-tensioned crawler crane, the end of the luffing rope 85 is fixed to the base of the bottom layer of the luffing winch 82. If the bottom rope is fully released, the luffing rope 85 will bend backward, crushing, and becoming scrapped. Therefore, the bottom rope cannot be fully released. A large value for the first target turn can result in the luffing rope 85 not being pre-tightened at the base, or the pre-tightening effect being poor. The specific value of the first target turn can be designed by those skilled in the art based on actual needs.

[0093] Alternatively, the second target layer in step S3 is the second winding layer, and the second target turn is the third turn, but this is not limited to this. The specific values ​​of the second target layer and the second target turn should be designed to avoid a situation where, after the second target layer is pre-tightened and the backpack is lowered, the pre-tightened portion will loosen, resulting in all previous efforts being wasted. It is also necessary to avoid a situation where the number of winding turns is too large and meaningless. The specific values ​​of the second target layer and the second target turn can be designed by those skilled in the art based on actual needs.

[0094] In practice, the operating method for the luffing rope pre-tensioning tool for lifting equipment includes a release-retract-release process. The hoist 21 of the mobile mechanism 2 is lifted, and the pre-tensioned crane simultaneously releases the luffing rope 85 to the last half turn on the bottom layer. The load force displayed on the load force display is observed, and a single rope force of approximately 1 ton is applied according to the luffing ratio. When the hoist 21 reaches this load value, the luffing winch 82 begins to slowly retract, while the hoist 21 is slowly lowered until the pre-tensioned luffing rope 85 reaches the third turn on the second layer. At this point, the luffing winch 82 stops retracting. (When the connecting components are single pull plate 3 and double pull plates 4) The sling 21 continues to be lowered, and at the same time, it is necessary to observe whether the arm frame 81 pull plate has fallen correctly into the pull plate seat, and patrol from the upper boom head pedal to the upper backpack pulley block 83. If the pull plate is deviated, the sling 21 needs to be stopped and the pull plate is moved into the pull plate seat, and then the sling 21 continues to be lowered until the backpack falls to the lower boom head, and the tooling is removed. (Or, when the connecting component is a wire rope) The sling 21 continues to be lowered, and at the same time, it is necessary to observe whether the wire rope has fallen into the correct position, and patrol from the upper boom head pedal to the upper backpack pulley block 83. If the wire rope is deviated, the sling 21 needs to be stopped and the wire rope is moved to the correct position, and then the sling 21 continues to be lowered until the backpack falls to the lower boom head, and the tooling is removed.

[0095] During specific implementation, the luffing winch 82 can be controlled by a controller to retract and release the luffing rope 85; or the operator in the mobile mechanism 2 can observe the changes in the lifting force and control the retraction of the rope through wired or wireless communication with the personnel in the cab of the lifting equipment to pre-tighten the luffing rope 85.

[0096] Exemplary embodiment 1

[0097] For specific implementation, seeFigure 1 、 Figure 7 The free end of the first lug 111 is provided with a first through-hole, and the free end of the second lug 112 is provided with a second through-hole. The first stopper includes a first pin 113 and a first retaining pin 114. The first pin 113 passes through the first and second through-holes, and its ends protrude from the first and second lugs 111, 112, respectively. The end of the first pin 113 protruding from the first lug 111 is provided with a first opening, and the end of the first pin 113 protruding from the second lug 112 is provided with a second opening. The first and second openings are each provided with a first retaining pin 114. The first and second openings can be through holes or blind holes. However, this is not limiting. The first stopper can be used as long as it can connect the first and second lugs 111, 112, and the single and double pull plates 3 and 4 at the first position. The specific structural form can be designed by those skilled in the art based on actual needs.

[0098] In a specific implementation, the single pull plate 3 is provided with a fifth through-hole at a first position, and the double pull plate 4 is provided with a sixth through-hole at a first position. A second stopper is provided between the fifth and sixth through-holes to prevent disconnection between the single pull plate 3 and the double pull plate 4. The second stopper comprises a second pin 51 and a second pin 52. The second pin 51 passes through the fifth and sixth through-holes, and its ends protrude from the axial side surfaces of the double pull plate 4 along the fifth through-hole, forming a first protrusion and a second protrusion. The first protrusion is provided with a third opening, and the second protrusion is provided with a fourth opening. The third and fourth openings are respectively provided with the second pin 52. The third and fourth openings can be through holes or blind holes. However, this is not limiting. The second stopper can be used as long as it can connect the single pull plate 3 and the double pull plate 4. The specific structural form can be designed by those skilled in the art based on actual needs.

[0099] Specifically, the force transmission device 1 is provided with a first stopper, and a second stopper is provided at the connection between the single pull plate 3 and the double pull plate 4. When tooling is not required, the second stopper is used to connect the single pull plate 3 and the double pull plate 4. When tooling is required for operation, the second stopper at the connection between the single pull plate 3 and the double pull plate 4 needs to be removed. After the first stopper on the force transmission device 1 is removed from the force transmission device 1, it is used to connect the force transmission device 1 with the single pull plate 3 and the double pull plate 4 at the location where the second stopper was removed. It should be noted that when more than one single pull plate 3 or double pull plate 4 is provided, only the second stopper at the location where the force transmission device 1 needs to be connected is removed; the second stops at other locations remain.

[0100] An embodiment of the present invention provides an operating method based on the above-mentioned luffing rope pre-tensioning tooling for lifting equipment, wherein the connecting assembly includes a single pull plate 3 and a double pull plate 4 connected to each other, the connection position of the single pull plate 3 and the double pull plate 4 is a first position, and the force transmission device 1 is connected to the first position; when the second stopper includes a second pin 51 and a second pin 52; before step S1, the method further includes step S0: removing the second stopper connecting the single pull plate 3 and the double pull plate 4 at the first position;

[0101] Step S1 specifically includes: placing the single pull plate 3 and the double pull plate 4 at the first position in the gap between the first ear plate 111 and the second ear plate 112, and then passing through the first stopper;

[0102] Step S4 specifically includes: the moving mechanism 2 continues to move while ensuring that the crane arm 81 pulls the plate correctly into the pull seat until the backpack connected to the connecting assembly falls to the specified position;

[0103] After step S4 , the method further includes step S5 : removing the tooling, and using the second stopper to fix the single pull plate 3 and the double pull plate 4 at the first position, and the first stopper remains on the force transmission device 1 .

[0104] Exemplary embodiment 2

[0105] like Figure 2 、 Figure 5 、 Figure 6 As shown, the second embodiment of the present invention provides a luffing rope pre-tightening tool and an operating method for lifting equipment. The difference between the second embodiment of the present invention and the first embodiment is that:

[0106] In specific implementations, the second stopper includes a third pin 61 and a third locating pin 62. The third pin 61 passes through the fifth and sixth through-holes, with both ends of the third pin 61 protruding from the two axial side surfaces of the double pull plate 4 along the fifth through-hole, forming a third protrusion and a fourth protrusion. The third protrusion is provided with a fifth opening 611 and a seventh opening 612, while the fourth protrusion is provided with a sixth opening 613 and an eighth opening 614. The fifth and sixth openings 611 and 613 are each provided with the third locating pin 62, or the seventh and eighth openings 612 and 614 are each provided with the third locating pin 62. The second stopper can also serve as the first stopper. In this case, the third pin 61 is equivalent to the first pin 113, the seventh opening 612 is equivalent to the first opening, the eighth opening 614 is equivalent to the second opening, and the third locating pin 62 is equivalent to the first locating pin 114. The fifth opening 611, the sixth opening 613, the seventh opening 612, and the eighth opening 614 can be through holes or blind holes. However, this is not limiting. The third stopper only needs to be able to connect the single pull plate 3 and the double pull plate 4, and can also connect the first ear plate 111, the second ear plate 112, and the single pull plate 3 and the double pull plate 4 at the first position. The specific structure can be designed by those skilled in the art according to actual needs.

[0107] That is, the force transmission device 1 is not provided with a first stopper (the force transmission device 1 does not include a first stopper), and a second stopper is provided at the connection position between the single pull plate 3 and the double pull plate 4. When tooling is not required, the second stopper is used to connect the single pull plate 3 and the double pull plate 4. When tooling is required for operation, the first ear plate 111 and the second ear plate 112 of the force transmission device 1 are placed in the first connection position, and the first stopper is used to connect the first ear plate 111, the second ear plate 112, the single pull plate 3, and the double pull plate 4. It should be noted that when more than one single pull plate 3 and double pull plate 4 are provided, only the second stopper at the position where the force transmission device 1 is required to connect is provided as a member that enables the connection of all four (i.e., the second stopper includes a third pin 61 and a third retaining pin 62). The second stops at other positions are only used to connect the single pull plate 3 and the double pull plate 4 (i.e., the second stopper includes a second pin 51 and a second retaining pin 52). However, it is not limited thereto, and the second stop members at other positions may also be configured as components capable of achieving four-way connection, so as to provide more operational possibilities during tooling operations.

[0108] An embodiment of the present invention provides an operating method for the luffing rope pre-tensioning tooling for lifting equipment, wherein the connecting assembly includes a single pull plate 3 and a double pull plate 4 connected to each other, the connection position of the single pull plate 3 and the double pull plate 4 being a first position, and the force transmission device 1 being connected to the first position; when the second stopper includes a third pin 61 and a third pin 62; before step S1, the method further includes step S0: removing the second stopper connecting the single pull plate 3 and the double pull plate 4 at the first position;

[0109] Step S1 specifically includes: placing the single pull plate 3 and the double pull plate 4 at the first position in the gap between the first ear plate 111 and the second ear plate 112, and then passing through the second stopper;

[0110] Step 4 specifically includes: the moving mechanism 2 continues to move while ensuring that the crane arm 81 pulls the plate correctly into the pull seat until the backpack connected to the connecting assembly falls to the specified position;

[0111] After step S4 , the method further includes step S5 : removing the tooling and fixing the single pull plate 3 and the double pull plate 4 using a second stopper.

[0112] Finally, it should be noted that, in this document, relational terms such as first and second, etc., are used only 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 "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

[0113] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0114] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A luffing rope pre-tightening tool for a lifting device, comprising a lifting device body (8), an arm (81) pivoted relative to one end of the lifting device body (8), and a luffing winch (82) rotatably mounted to the lifting device body (8), characterized in that: include: A connecting assembly, one end of which is connected to the top of the arm (81) and the other end of which is rotatably mounted with an upper backpack pulley assembly (83); A lower backpack pulley assembly (84) is fixed to the lifting equipment body (8); A variable amplitude rope (85) connects the upper backpack pulley group (83) and the lower backpack pulley group (84) and is used to change the distance between the upper backpack pulley group (83) and the lower backpack pulley group (84); A force transmission device (1), the force transmission device (1) being adapted to be detachably connected to the connection assembly; A moving mechanism (2) is detachably connected to the force transmission device (1), and the moving mechanism (2) can drive the force transmission device (1) to move, thereby enabling the connecting assembly to apply tension to the variable amplitude rope (85).

2. The luffing rope pre-tightening tool for lifting equipment according to claim 1, characterized in that: The force transmission device (1) comprises: A clamping portion (11), the clamping portion (11) being detachably connected to the connecting assembly; The connecting portion (12) is connected to the clamping portion (11) and is detachably connected to the moving mechanism (2).

3. The luffing rope pre-tightening tool for lifting equipment according to claim 2, characterized in that: The clamping portion (11) includes a clamping claw; Alternatively, the clamping portion (11) comprises a first ear plate (111) and a second ear plate (112) that are spaced apart; one end of the first ear plate (111) is connected to the connecting portion (12), and the other end is a free end; one end of the second ear plate (112) is connected to the connecting portion (12), and the other end is a free end; a gap between the free end of the first ear plate (111) and the free end of the second ear plate (112) is used to accommodate the connecting assembly, and the clamping portion (11) further comprises a first stopper for preventing the connecting assembly from escaping from the gap.

4. The luffing rope pre-tightening tool for lifting equipment according to claim 1, characterized in that: The connecting assembly includes a steel wire rope; Alternatively, the connection assembly comprises a single pull plate (3) and a double pull plate (4) connected to each other, the connection position of the single pull plate (3) and the double pull plate (4) is a first position, and the force transmission device (1) is connected to the first position.

5. The luffing rope pre-tightening tool for lifting equipment according to claim 4, characterized in that: The single pull plate (3) is provided with a fifth through hole at the first position, the double pull plate (4) is provided with a sixth through hole at the first position, and a second stopper is provided between the fifth through hole and the sixth through hole to prevent the single pull plate (3) from being disconnected from the double pull plate (4); The second stopper comprises a second pin shaft (51) and a second pin (52), the second pin shaft (51) passes through the fifth through hole and the sixth through hole, and both ends of the second pin shaft (51) respectively protrude from the two axial sides of the double pull plate (4) along the fifth through hole to form a first protrusion and a second protrusion, the first protrusion is provided with a third opening, and the second protrusion is provided with a fourth opening; the third opening and the fourth opening are respectively provided with the second pin (52).

6. The luffing rope pre-tightening tool for lifting equipment according to claim 4, characterized in that: The single pull plate (3) is provided with a fifth through hole at the first position, the double pull plate (4) is provided with a sixth through hole at the first position, and a second stopper is provided between the fifth through hole and the sixth through hole to prevent the single pull plate (3) from being disconnected from the double pull plate (4); The second stopper includes a third pin shaft (61) and a third pin (62), the third pin shaft (61) passes through the fifth through hole and the sixth through hole, and the two ends of the third pin shaft (61) respectively protrude from the two side surfaces of the double pull plate (4) along the axial direction of the fifth through hole to form a third protrusion and a fourth protrusion, the third protrusion is provided with a fifth opening (611) and a seventh opening (612), and the fourth protrusion is provided with a sixth opening (613) and an eighth opening (614); the fifth opening (611) and the sixth opening (613) are respectively provided with the third pin (62), or the seventh opening (612) and the eighth opening (614) are respectively provided with the third pin (62); the second stopper can also be used as the first stopper.

7. The luffing rope pre-tightening tool for lifting equipment according to claim 1, characterized in that: The moving mechanism (2) comprises: A sling (21), wherein the sling (21) is connected to the force transmission device (1) via a flexible connector (7); The lifting force display device is used to display the lifting force of the connecting component.

8. An operating method for a luffing rope pre-tightening tool for lifting equipment according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1: Connect the force transmission device (1) to the connecting assembly and fix the two together; S2: The moving mechanism (2) moves to control the luffing winch (82) to release the luffing rope (85) to the first target layer and the first target circle; S3: the moving mechanism (2) reaches the hoisting load value, controls the luffing winch (82) to retract the luffing rope (85), and at the same time the moving mechanism (2) moves at a speed to ensure that the tension value of the luffing rope (85) is within a specified range, until the pre-tightened luffing rope (85) is wound around the second target layer and the second target circle, at which time the luffing rope (85) is stopped; S4: The moving mechanism (2) moves until the backpack connected to the connecting assembly falls to a specified position.

9. The method for operating the luffing rope pre-tensioning tool for lifting equipment according to claim 8, characterized in that: The connecting assembly comprises a single pull plate (3) and a double pull plate (4) connected to each other, the connection position of the single pull plate (3) and the double pull plate (4) is a first position, and the force transmission device (1) is connected to the first position; when the second stopper comprises a second pin shaft (51) and a second pin (52); Before step S1, the method further includes step S0: removing the second stopper; Step S1 specifically comprises: placing the single pull plate (3) and the double pull plate (4) at the first position in the gap between the first ear plate (111) and the second ear plate (112), and then passing through the first stopper; Step S4 specifically includes: the moving mechanism (2) moves while ensuring that the arm pull plate of the lifting equipment correctly falls into the pull plate seat until the backpack connected to the connecting assembly falls to a specified position; After step S4, the method further includes step S5: removing the tooling and fixing the single pull plate (3) and the double pull plate (4) with a second stopper, and the first stopper remains on the force transmission device (1).

10. The method for operating the luffing rope pre-tensioning tool for lifting equipment according to claim 9, characterized in that: The connecting assembly comprises a single pull plate (3) and a double pull plate (4) connected to each other, the connection position of the single pull plate (3) and the double pull plate (4) is a first position, and the force transmission device (1) is connected to the first position; when the second stopper comprises a third pin shaft (61) and a third pin (62); Before step S1, the method further includes step S0: removing the second stopper; Step S1 specifically comprises: placing the single pull plate (3) and the double pull plate (4) at the first position in the gap between the first ear plate (111) and the second ear plate (112), and then passing through the second stopper; Step 4 specifically includes: the moving mechanism (2) moves while ensuring that the arm pull plate of the lifting equipment correctly falls into the pull plate seat until the backpack connected to the connecting assembly falls to a specified position; After step S4, the method further includes step S5: removing the tooling and using a second stopper to fix the single pull plate (3) and the double pull plate (4).

11. The method for operating the luffing rope pre-tensioning tool for lifting equipment according to claim 9, characterized in that: The first target layer in step S2 is the bottom layer, and the first target circle is the last half circle; And / or, the second target layer in step S3 is the second winding layer, and the second target turn is the third turn.

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