A lifting assembly for lifting a steel box girder

Abstract

The present application relates to hoisting equipment technical field, specifically to a kind of sling assembly for steel box girder hoisting, it includes hook body, plugging piece, limiting piece and control unit, when steel rope enters hook groove and contacts hook groove, the gravity of steel rope itself will act on hook groove, at this time control unit controls second limiting unit to remove the locking of plugging rod from second mounting block, while controlling first limiting unit to hinder plugging rod from first mounting block;When one end of steel rope is connected with steel box girder, the hook handle is pulled by hoisting equipment, so that steel rope is gradually tensioned, the extrusion force of steel rope to hook groove gradually increases, control unit controls first limiting unit to hinder plugging rod from first mounting block, while controlling second limiting unit to hinder plugging rod from second mounting block, to ensure that steel rope does not occur from hook groove during the process of hoisting steel box girder, to ensure the safety of hoisting steel box girder process.

Description

Technical Field

[0001] This invention relates to the field of hoisting equipment technology, and specifically to a hoisting tool assembly for hoisting steel box girders. Background Technology

[0002] During bridge construction, the hoisting of steel box girders relies on lifting equipment assemblies for safe and efficient lifting and relocation. The compatibility between the slings and hooks directly affects the stability of the hoisting process and the lifespan of the equipment. Existing hooks typically have anti-derailment structures installed. Conventional anti-derailment structures require manual unlocking during the sling retrieval phase, increasing the labor intensity of workers and presenting inconvenience and inefficiency. Furthermore, when the slings bear the weight of the steel box girder or when the load is removed, relative displacement occurs at the contact points between the slings and hooks. This sliding friction exacerbates wear on both surfaces. Over time, the steel wires on the sling surface may break or become fuzzy due to wear, and the hook connection may deform due to wear, leading to a decrease in the fit accuracy between the slings and hooks and significantly increasing the risk of sling breakage. Summary of the Invention

[0003] This invention provides a lifting tool assembly for steel box girder hoisting, in order to solve the problem that the anti-detachment structure installed on the existing hook affects construction efficiency.

[0004] The lifting tool assembly for hoisting steel box girders of the present invention adopts the following technical solution:

[0005] A lifting tool assembly for hoisting steel box girders includes a hook, a sealing component, a limiting component, and a control unit.

[0006] The hook body has a hook tip, a hook groove, and a hook shank. The hook shank is used to connect to lifting equipment; the hook groove is used to carry a steel rope; the sealing component includes a first mounting block, a second mounting block, and a sealing rod. The first mounting block is mounted on the hook tip, the second mounting block is mounted on the hook shank, and both ends of the sealing rod are detachably connected to the first mounting block and the second mounting block, respectively; the limiting component includes a first limiting unit and a second limiting unit. The first limiting unit is used to prevent one end of the sealing rod from detaching from the first mounting block, and the second limiting unit is used to prevent the other end of the sealing rod from detaching from the second mounting block; the adjustment... The unit is used to adjust the first limiting unit to release the locking of the sealing rod from the first mounting block when the steel rope is not in contact with the hook groove; when the steel rope is in a slack state in the hook groove, the adjusting unit adjusts the second limiting unit to release the locking of the sealing rod from the second mounting block, and at the same time adjusts the first limiting unit to prevent the sealing rod from leaving the first mounting block; when the steel rope is in a taut state in the hook groove, the adjusting unit adjusts the first limiting unit to prevent the sealing rod from leaving the first mounting block, and at the same time adjusts the second limiting unit to prevent the sealing rod from leaving the second mounting block.

[0007] Furthermore, the first limiting unit includes a first arc plate, the first mounting block is provided with a first arc groove with an opening, one end of the sealing rod is fixedly provided with a first fixing post, the first fixing post can be placed in the first arc groove; the first arc plate is rotatably connected to the first mounting block, and the first arc plate can block the opening of the first arc groove when it rotates; initially, the first arc plate is set to be in a state where the opening of the first arc groove is not blocked.

[0008] Furthermore, the second limiting unit includes a second arc plate, and the second mounting block is provided with a second arc groove with an opening. The other end of the sealing rod is fixedly provided with a second fixing post, which can be placed in the second arc groove. The second arc plate is rotatably connected to the second mounting block, and the second arc plate can block the opening of the second arc groove when it rotates. Initially, the second arc plate is set to be in the state of blocking the opening of the second arc groove.

[0009] Furthermore, the control unit includes a sensing cylinder and a first control cylinder; the sensing cylinder is disposed at the hook groove, and the first control cylinder is disposed at the hook tip; when the length of the first control cylinder changes, it can drive the first arc plate to slide on the first mounting block; when the steel rope contacts the hook groove, the steel rope can squeeze the sensing cylinder, and the sensing cylinder and the first control cylinder are connected through a first conduit.

[0010] Furthermore, the control unit also includes a second control cylinder, which is located at the hook handle. When the length of the second control cylinder changes, it can drive the second arc plate to slide on the second mounting block. When the steel rope contacts the hook groove, the steel rope can squeeze the sensing cylinder. The sensing cylinder and the second control cylinder are connected through a second conduit.

[0011] Further, the sensing cylinder includes a cylinder and a piston rod, a piston disc is fixedly mounted on the piston rod, and the piston disc is disposed inside the cylinder; a first communication port is provided on the cylinder, and the first communication port is located above the piston disc; the first regulating cylinder includes a first cylinder body and a first cylinder shaft; one end of the first cylinder shaft is slidably and sealingly disposed inside the first cylinder body, a first sealing disc is disposed inside the first cylinder body, gas is filled between the first cylinder shaft and the first sealing disc, and hydraulic oil is filled between the lower end of the first cylinder shaft and the first sealing disc; one end of the first conduit is connected to the first communication port, and the other end of the first conduit passes through the lower end of the first cylinder body.

[0012] Furthermore, the cylinder has a first diameter section and a second diameter section inside, the diameter of the first diameter section being smaller than the diameter of the second diameter section; the diameter of the piston disc is equal to the diameter of the first diameter section; a switching disc is slidably and sealed inside the second diameter section of the cylinder; a second communication port is provided on the cylinder, the second communication port being located between the piston disc and the switching disc; when the piston rod moves relative to the cylinder, the piston rod can push the switching disc; the second regulating cylinder includes a second cylinder body and a second cylinder shaft, one end of the second cylinder shaft being slidably and sealed inside the second cylinder body, one end of the second conduit being connected to the second communication port, and the other end of the second conduit being connected to the inside of the second cylinder body.

[0013] Furthermore, a fixing ring is provided on the hook handle, and a fixing guide rail is installed on the fixing ring. The fixing guide rail is arc-shaped, and the arc of the fixing guide rail is equal to the arc of the hook groove. A sliding rod is provided on the fixing guide rail, and the cylinder of the sensing cylinder is fixedly installed on the sliding rod. A rope groove is provided on the sliding rod, and the steel rope can enter the rope groove.

[0014] Furthermore, a locking screw is provided on the sliding rod, which can fix the sliding rod on the fixed guide rail. When the steel cable is taut, the locking screw can be used to prevent the sliding rod from sliding on the fixed guide rail.

[0015] Furthermore, the fixed guide rail and the sliding rod are provided on both sides of the hook groove.

[0016] The beneficial effects of this invention are as follows: A lifting device assembly for hoisting steel box girders includes a hook body, a sealing component, a limiting component, and an adjusting unit. When hoisting a steel box girder, a lifting device is connected to the hook handle of the hook body via a traction rope. In the initial state, one end of the sealing rod in the sealing component can freely detach from the first mounting block, while the other end of the sealing rod cannot freely detach from the second mounting block due to the obstruction of the second limiting unit. At this time, the worker can smoothly place the steel rope into the hook groove. When the steel rope enters the hook groove and contacts it, the weight of the steel rope itself acts on the hook groove. At this time, the adjusting unit adjusts the second limiting unit to release the locking of the sealing rod from the second mounting block, and simultaneously adjusts the first limiting unit to prevent the sealing rod from detaching from the first mounting block. In this state, it is convenient for the worker to lift the steel box girder. The rope is removed from the hook groove. When one end of the steel rope is connected to the steel box girder, the traction of the hook handle by the lifting equipment gradually tensions the steel rope, increasing the squeezing force of the steel rope on the hook groove. At this time, when the steel rope is taut in the hook groove, the control unit adjusts the first limit unit to prevent the sealing rod from detaching from the first mounting block, and simultaneously adjusts the second limit unit to prevent the sealing rod from detaching from the second mounting block, ensuring that the steel rope will not detach from the hook groove during the hoisting of the steel box girder, thus ensuring the safety of the hoisting process. After the steel box girder is hoisted, the steel rope returns to a slack state in the hook groove. The control unit then adjusts the second limit unit to release the locking of the sealing rod from the second mounting block, allowing the steel rope to be directly removed from the hook groove without manual intervention, thereby improving operational efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a lifting tool assembly for hoisting a steel box girder, provided in an embodiment of the present invention.

[0019] Figure 2 A side view of a lifting tool assembly for hoisting a steel box girder provided in an embodiment of the present invention;

[0020] Figure 3 A front view of a lifting tool assembly for hoisting a steel box girder provided in an embodiment of the present invention;

[0021] Figure 4 for Figure 2 A schematic diagram of the structure after being cut along the AA direction;

[0022] Figure 5 for Figure 4A magnified view of a section at point C;

[0023] Figure 6 for Figure 4 A magnified view of a section at point D;

[0024] Figure 7 for Figure 2 Cross-sectional view along the BB direction;

[0025] Figure 8 for Figure 7 A magnified view of a section at point E in the middle;

[0026] Figure 9 This is a diagram showing the state of the steel rope contacting the hook groove in a lifting tool assembly for hoisting a steel box girder, provided in an embodiment of the present invention.

[0027] Figure 10 This invention provides a diagram showing the state of a steel cable taut in a hook groove within a lifting tool assembly for hoisting a steel box girder, as provided in an embodiment of the invention.

[0028] Figure 11 An exploded view of a lifting tool assembly for hoisting a steel box girder, provided in an embodiment of the present invention;

[0029] Figure 12 This is a schematic diagram of the structure of a second type of hoisting groove used in a lifting tool assembly for hoisting steel box girders, provided in an embodiment of the present invention;

[0030] Figure 13 for Figure 12 A magnified view of a section at point F.

[0031] In the diagram: 110, hook groove; 120, hook handle; 130, connecting ring; 140, first mounting block; 150, second mounting block; 160, sealing rod; 170, first arc plate; 180, second arc plate; 210, sensing cylinder; 211, cylinder body; 212, piston rod; 213, piston disc; 214, switching disc; 220, first regulating cylinder; 221, first cylinder body; 222, first cylinder shaft; 223, first sealing disc; 230, first guide tube; 240, second regulating cylinder; 241, second cylinder body; 242, second cylinder shaft; 250, second guide tube; 310, fixed guide rail; 320, sliding rod; 330, hoop groove; 340, locking screw; 350, guide rail groove; 360, bracket. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] The serial numbers assigned to components in this document, such as "first," "second," etc., are merely used to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages). In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do 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. Therefore, they should not be construed as limitations on the invention.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] like Figures 1 to 11 As shown in the figure, an embodiment of the present invention provides a lifting tool assembly for hoisting steel box girders, which includes a hook body, a sealing component, a limiting component, and a control unit.

[0036] The hook body has a hook tip, a hook groove 110, and a hook shank 120. The hook shank 120 is used to connect to lifting equipment. In this embodiment, a connecting ring 130 is fixedly installed on the hook shank 120. The lifting equipment is usually a crane. The connecting ring 130 can be directly connected to the traction rope on the crane. When the crane is running, the traction rope drives the hook shank 120 to move. The hook groove 110 is used to carry the steel rope. One end of the steel rope can be connected to the steel box girder to be lifted, and the other end of the steel rope can be looped in the hook groove 110. When the crane drives the hook shank 120 to move, the steel rope can be gradually tensioned and the steel box girder can be gradually lifted.

[0037] The sealing component includes a first mounting block 140, a second mounting block 150, and a sealing rod 160. The first mounting block 140 is mounted on the hook tip, and the second mounting block 150 is mounted on the hook shank 120. The first mounting block 140 and the second mounting block 150 are differentiated in the height direction. In this embodiment, the horizontal height of the second mounting block 150 is higher than the mounting height of the first mounting block 140. The two ends of the sealing rod 160 are detachably connected to the first mounting block 140 and the second mounting block 150, respectively. Specifically, one end of the sealing rod 160 is rotatably connected to the first mounting block 140, and the other end of the sealing rod 160 is rotatably connected to the second mounting block 150. Because the horizontal height of the second mounting block 150 is higher than the mounting height of the first mounting block 140, the sealing rod 160 is in an inclined state, and the first sealing rod 160 can block the opening of the hook groove 110. In the initial state, it is set that one end of the sealing rod 160 can freely detach from the first mounting block 140.

[0038] The limiting component includes a first limiting unit and a second limiting unit. The first limiting unit prevents one end of the sealing rod 160 from disengaging from the first mounting block 140, and the second limiting unit prevents the other end of the sealing rod 160 from disengaging from the second mounting block 150. Initially, the first limiting unit is set to release the obstruction of one end of the sealing rod 160 from disengaging from the first mounting block 140, and the second limiting unit is set to prevent one end of the sealing rod 160 from disengaging from the second mounting block 150, ensuring that the steel rope can be smoothly placed into the hook groove 110.

[0039] The control unit is used to release the locking of the sealing rod 160 from the first mounting block 140 when the steel rope is not in contact with the hook groove 110, so that the steel rope can enter the hook groove 110. When the steel rope enters the hook groove 110, it contacts the side wall of the hook groove 110. Due to the weight of the steel rope, it will exert some pressure on the hook groove 110, but the steel rope is not taut at this time. At this time, the control unit controls the second limit unit to release the locking of the sealing rod 160 from the second mounting block 150, and at the same time controls the first limit unit to prevent the sealing rod 160 from leaving the first mounting block 140. At this time, the operator can directly pull the steel rope out of the hook groove 110. As the crane operates, the steel cable gradually becomes taut, increasing the pressure exerted on the hook groove 110. At this point, the control unit adjusts the first limit unit to prevent the sealing rod 160 from disengaging from the first mounting block 140, and simultaneously adjusts the second limit unit to prevent the sealing rod 160 from disengaging from the second mounting block 150. Under the action of the sealing rod 160, the steel cable cannot detach from the hook groove 110, thus improving safety during the hoisting of the steel box girder. After the steel box girder is hoisted, the steel cable returns to a slack state within the hook groove 110. The control unit then adjusts the second limit unit to release the locking of the sealing rod 160 from the second mounting block 150, allowing the steel cable to be directly removed from the hook groove 110 without manual intervention, thereby improving operational efficiency.

[0040] In one embodiment, the first limiting unit includes a first arc plate 170, a first mounting block 140 having a first arc groove with an opening, and a first fixing post fixedly mounted at one end of a sealing rod 160. The first fixing post can be placed in the first arc groove and can rotate within it. The first arc plate 170 is rotatably connected to the first mounting block 140, and when rotating, it can block the opening of the first arc groove. Initially, the first arc plate 170 is set to an unblocked state of the first arc groove opening, ensuring that the first fixing post can detach from the first mounting block 140, thereby facilitating the placement of the steel rope into the hook groove 110 by the operator.

[0041] In one embodiment, the second limiting unit includes a second arc plate 180, a second arc groove with an opening on the second mounting block 150, and a second fixing post fixedly mounted on the other end of the sealing rod 160. The second fixing post can be placed in the second arc groove and can rotate within the second arc groove. The second arc plate 180 is rotatably connected to the second mounting block 150, and the second arc plate 180 can block the opening of the second arc groove when rotating. Initially, the second arc plate 180 is set to block the opening of the second arc groove, so that the second fixing post cannot detach from the second mounting block 150, thus ensuring that the sealing rod 160 will not detach from the hook body in the initial state.

[0042] In one embodiment, the control unit includes a sensing cylinder 210 and a first control cylinder 220. The sensing cylinder 210 is located at the hook groove 110 and is initially set to a vertical position. The first control cylinder 220 is located at the hook tip. When the length of the first control cylinder 220 changes, it can drive the first arc plate 170 to slide on the first mounting block 140. Initially, the length of the first control cylinder 220 is at its longest, the first arc plate 170 is not blocking the first arc groove, and the length of the sensing cylinder 210 is at its longest. When the steel rope enters the hook groove 110, the steel rope will compress the hook groove 110 under its own weight. At the same time, the steel rope can also compress the sensing cylinder 210. When the length of the sensing cylinder 210 shortens, the length of the first control cylinder 220 also shortens. During the shortening process of the first control cylinder 220, the first control cylinder 220 drives the first arc plate 170 to slide on the first mounting block 140, and the first arc plate 170 gradually blocks the first arc groove. Furthermore, the sensing cylinder 210 and the first regulating cylinder 220 are connected by the first conduit 230 to ensure that the change in the length of the sensing cylinder 210 can drive the change in the length of the first regulating cylinder 220.

[0043] In one embodiment, the control unit further includes a second control cylinder 240, which is disposed at the hook handle 120. The second control cylinder 240 is initially set to a vertical state, and its length is at its shortest initially, preventing the second fixing post from disengaging from the second arc groove. As the length of the second control cylinder 240 increases, it drives the second arc plate 180 to slide on the second mounting block 150, gradually releasing the second arc plate 180 from blocking the opening of the second arc groove. When the steel rope enters the hook groove 110, it compresses the groove under its own weight, and simultaneously compresses the sensing cylinder 210. As the length of the sensing cylinder 210 shortens, the second regulating cylinder 240 gradually extends, causing the second arc plate 180 to gradually release the seal on the opening of the second arc groove. As the steel rope gradually tightens, the compressive force on the sensing cylinder 210 gradually increases. At this point, the second regulating cylinder 240 shortens, causing the second arc plate 180 to re-seal the opening of the second arc groove. This ensures that during the hoisting of the steel box girder, the first fixed column cannot detach from the first arc groove, and the second fixed column cannot detach from the second arc groove, thus ensuring stability during the hoisting process. Furthermore, the sensing cylinder 210 and the second regulating cylinder 240 are connected by a second conduit 250, ensuring that changes in the length of the sensing cylinder 210 can cause changes in the length of the second regulating cylinder 240.

[0044] In one embodiment, the sensing cylinder 210 includes a cylinder 211 and a piston rod 212. The cylinder 211 is vertically disposed at the hook groove 110. A piston disc 213 is fixedly disposed at one end of the piston rod 212. The piston disc 213 is disposed inside the cylinder 211 and is slidably and sealingly connected to the inner side wall of the cylinder 211. The side wall of the cylinder 211 is provided with a first connecting port that communicates with the inside and outside. The first connecting port is located above the piston disc 213. In the initial state, the overall length of the sensing cylinder 210 is at its longest state. The first regulating cylinder 220 includes a first cylinder body 221 and a first cylinder shaft 222. The first cylinder body 221 is fixedly disposed at the hook tip. One end of the first cylinder shaft 222 is slidably and sealingly disposed inside the first cylinder body 221. A first sealing disc 223 is disposed inside the first cylinder body 221. The space between the first cylinder shaft 222 and the first sealing disc 223 is filled with gas. The space between the lower end of the first cylinder shaft 222 and the first sealing disc 223 is filled with hydraulic oil. One end of the first conduit 230 is connected to the first connecting port, and the other end of the first conduit 230 passes through the lower end of the first cylinder 221. When the steel rope squeezes the upper end of the piston rod 212, the space above the piston disc 213 inside the cylinder 211 increases. Hydraulic oil inside the first cylinder 221 is drawn through the first conduit 230, thereby causing the length of the first regulating cylinder 220 to gradually shorten.

[0045] In one embodiment, the cylinder 211 has a first diameter section and a second diameter section inside, the diameter of the first diameter section being smaller than the diameter of the second diameter section, and the first diameter section being located above the second diameter section. The diameter of the piston disc 213 is equal to the diameter of the first diameter section. A switching disc 214 is slidably sealed inside the second diameter section of the cylinder 211; the interior of the second diameter section, and below the switching disc 214, is filled with gas, and hydraulic oil is present between the switching disc 214 and the piston disc 213. A second connecting port is provided on the cylinder 211, which is located between the piston disc 213 and the switching disc 214. When the piston rod 212 moves relative to the cylinder 211, it can push the switching disc 214. Specifically, the piston disc 213 is located in the middle of the piston rod 212. As the steel cable gradually tightens, the piston rod 212 gradually moves relative to the cylinder 211, and the end of the piston rod 212 gradually approaches the switching disc 214. At this time, the volume between the piston disc 213 and the switching disc 214 gradually decreases. When the piston rod 212 pushes the switching disc 214, the volume between the switching disc 214 and the piston disc 213 gradually increases. The second regulating cylinder 240 includes a second cylinder body 241 and a second cylinder shaft 242. One end of the second cylinder shaft 242 is slidably and sealingly disposed inside the second cylinder body 241. One end of the second conduit 250 is connected to the second connecting port, and the other end of the second conduit 250 is connected to the inside of the second cylinder body 241.

[0046] To make it easy to understand, when the steel rope is placed in the hook groove 110, the steel rope squeezes the upper end of the piston rod 212. At this time, the volume between the piston disc 213 and the switching disc 214 gradually decreases. The hydraulic oil between the piston disc 213 and the switching disc 214 enters the interior of the second cylinder 241 through the second conduit 250, causing the second regulating cylinder 240 to extend. During the extension process, the second regulating cylinder 240 gradually drives the second arc plate 180 to release the seal on the opening of the second arc groove. As the steel cable is gradually tightened, the squeezing force of the steel cable on the upper end of the piston rod 212 further increases. At this time, the piston rod 212 can push the switching disc 214. When the switching disc 214 moves, the volume between the piston disc 213 and the switching disc 214 gradually increases. Then, the hydraulic oil inside the second cylinder 241 returns to the space between the piston disc 213 and the switching disc 214 through the second conduit 250, causing the second regulating cylinder 240 to shorten again. During the shortening process, the second regulating cylinder 240 gradually drives the second arc plate 180 to block the opening of the second arc groove.

[0047] In one embodiment, a contact block is fixedly provided at the upper end of the piston rod 212, and a return spring is provided between the contact block and the upper end of the cylinder 211. The return spring is sleeved on the piston rod 212. The return spring is initially in its original length state. When the steel rope squeezes the hook groove 110, the return spring can deform. When the steel rope changes from a taut state to a slack state, the return spring can push the steel rope, thereby reducing the squeezing force of the steel rope on the hook groove 110.

[0048] In one embodiment, a fixing ring is provided on the hook handle 120, and a fixing guide rail 310 is mounted on the fixing ring. The fixing guide rail 310 is arc-shaped, and the arc of the fixing guide rail 310 is equal to the arc of the hook groove 110. A sliding rod 320 is provided on the fixing guide rail 310. The sliding rod 320 is arc-shaped, and the arc of the sliding rod 320 is equal to the arc of the fixing guide rail 310. One end of the sliding rod 320 is slidably mounted on the fixing guide rail 310. The cylinder 211 of the sensing cylinder 210 is fixedly mounted on the sliding rod 320, and a rope groove 330 is provided on the sliding rod 320, into which the steel rope can enter. During the gradual tensioning of the steel rope, relative movement can easily occur between the steel rope and the hook groove 110. This relative movement can easily cause wear on the steel rope, leading to a risk of steel rope breakage. By setting the hoop groove 330, as the steel rope gradually tightens, the steel rope drives the sliding rod 320 to move relative to the fixed guide rail 310 through the hoop groove 330, thereby reducing the friction between the steel rope and the hook groove 110.

[0049] In one embodiment, a locking screw 340 is provided on the sliding rod 320. The locking screw 340 can fix the sliding rod 320 on the fixed guide rail 310. When the steel rope is taut, the operator uses the locking screw 340 to prevent the sliding rod 320 from sliding on the fixed guide rail 310, which further reduces the friction between the steel rope and the hook groove 110 when used next time.

[0050] In one embodiment, fixed guide rails 310 and sliding rods 320 are provided on both sides of the hook groove 110. By providing two sets of fixed guide rails 310 and sliding rods 320, the friction between the two sides of the steel rope and the hook groove 110 is reduced.

[0051] In one embodiment, the two hooks share a hook handle 120. When hoisting the steel box girder, steel ropes are connected to both ends of the steel box girder along its length, and each steel rope is placed in a hook groove 110.

[0052] In one embodiment, such as Figures 12 to 13As shown, a guide rail groove 350 is fixedly installed on the hook groove 110. The guide rail groove 350 has the same curvature as the fixed guide rail 310. A bracket 360 is slidably installed in the guide rail groove 350. The bracket 360 is fixedly connected to the hoop groove 330. By setting the guide rail groove 350 and the bracket 360, the stability of the hoop groove 330 can be improved.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A lifting tool assembly for hoisting steel box girders, characterized in that, include: The hook body has a hook tip, a hook groove, and a hook shank, the hook shank being used to connect to lifting equipment; the hook groove being used to carry a steel rope. A sealing component, comprising a first mounting block, a second mounting block, and a sealing rod, wherein the first mounting block is mounted on the hook tip, the second mounting block is mounted on the hook shank, and the two ends of the sealing rod are detachably connected to the first mounting block and the second mounting block, respectively; The limiting component includes a first limiting unit and a second limiting unit. The first limiting unit is used to prevent one end of the blocking rod from disengaging from the first mounting block, and the second limiting unit is used to prevent the other end of the blocking rod from disengaging from the second mounting block. The control unit is configured to: release the locking of the sealing rod from the first mounting block by adjusting the first limiting unit when the steel rope is not in contact with the hook groove; release the locking of the sealing rod from the second mounting block by adjusting the second limiting unit when the steel rope is in a slack state in the hook groove, while simultaneously adjusting the first limiting unit to prevent the sealing rod from detaching from the first mounting block; and prevent the sealing rod from detaching from the second mounting block by adjusting the first limiting unit when the steel rope is in a taut state in the hook groove, while simultaneously adjusting the second limiting unit to prevent the sealing rod from detaching from the second mounting block. The first limiting unit includes a first arc plate, the first mounting block is provided with a first arc groove with an opening, and a first fixing post is fixedly provided at one end of the sealing rod, the first fixing post being able to be placed in the first arc groove; The first arc plate is rotatably connected to the first mounting block, and the first arc plate can block the opening of the first arc groove when it rotates; initially, the first arc plate is set to be in a state where the opening of the first arc groove is not blocked. The second limiting unit includes a second arc plate, the second mounting block is provided with a second arc groove with an opening, and the other end of the sealing rod is fixedly provided with a second fixing post, which can be placed in the second arc groove; The second arc plate is rotatably connected to the second mounting block, and the second arc plate can block the opening of the second arc groove when it rotates; Initially, the second arc plate is set to block the opening of the second arc groove; The control unit includes a sensing cylinder and a first control cylinder; the sensing cylinder is disposed at the hook groove, and the first control cylinder is disposed at the hook tip; when the length of the first control cylinder changes, it can drive the first arc plate to slide on the first mounting block; when the steel rope contacts the hook groove, the steel rope can squeeze the sensing cylinder; the sensing cylinder and the first control cylinder are connected through a first conduit. The control unit also includes a second control cylinder, which is located at the hook handle. When the length of the second control cylinder changes, it can drive the second arc plate to slide on the second mounting block. When the steel rope contacts the hook groove, the steel rope can squeeze the sensing cylinder. The sensing cylinder and the second control cylinder are connected by a second conduit.

2. The lifting tool assembly for steel box girder hoisting according to claim 1, characterized in that: The sensing cylinder includes a cylinder and a piston rod. A piston disc is fixedly mounted on the piston rod and disposed inside the cylinder. A first communication port is provided on the cylinder and is located above the piston disc. The first regulating cylinder includes a first cylinder body and a first cylinder shaft. One end of the first cylinder shaft is slidably and sealingly disposed inside the first cylinder body. A first sealing disc is disposed inside the first cylinder body. Gas is filled between the first cylinder shaft and the first sealing disc. Hydraulic oil is filled between the lower end of the first cylinder shaft and the first sealing disc. One end of the first conduit is connected to the first communication port, and the other end of the first conduit passes through the lower end of the first cylinder body.

3. The lifting tool assembly for steel box girder hoisting according to claim 2, characterized in that: The cylinder has a first diameter section and a second diameter section inside, the diameter of the first diameter section being smaller than the diameter of the second diameter section; the diameter of the piston disc is equal to the diameter of the first diameter section; a switching disc is slidably and sealed inside the second diameter section of the cylinder; a second communication port is provided on the cylinder, the second communication port being located between the piston disc and the switching disc; when the piston rod moves relative to the cylinder, the piston rod can push the switching disc; the second regulating cylinder includes a second cylinder body and a second cylinder shaft, one end of the second cylinder shaft being slidably and sealed inside the second cylinder body, one end of the second conduit being connected to the second communication port, and the other end of the second conduit being connected to the inside of the second cylinder body.

4. The lifting tool assembly for steel box girder hoisting according to claim 2, characterized in that: A fixing ring is provided on the hook handle, and a fixing guide rail is installed on the fixing ring. The fixing guide rail is arc-shaped, and the arc of the fixing guide rail is equal to the arc of the hook groove. A sliding rod is provided on the fixing guide rail, and the cylinder of the sensing cylinder is fixedly installed on the sliding rod. A rope groove is provided on the sliding rod, and the steel rope can enter the rope groove.

5. A lifting tool assembly for hoisting steel box girders according to claim 4, characterized in that: The sliding rod is equipped with a locking screw, which can fix the sliding rod to the fixed guide rail. When the steel rope is taut, the locking screw can be used to prevent the sliding rod from sliding on the fixed guide rail.

6. The lifting tool assembly for steel box girder hoisting according to claim 4, characterized in that: The fixed guide rail and the sliding rod are provided on both sides of the hook groove.

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