Long goods lifting appliance with automatic unhooking function
By designing a lifting device for long cargo that can automatically unhook, and using a hook cylinder and transmission rod to achieve automatic opening and closing of the hook, the problems of low lifting efficiency and unloading safety risks for long cargo are solved, and efficient automated operation is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- TIANJIN PORT HUISHENG TERMINAL
- Filing Date
- 2025-05-30
- Publication Date
- 2026-04-28
AI Technical Summary
Existing technologies have low efficiency in lifting long cargo, cannot effectively utilize the capacity of lifting equipment, and require manual operation during unloading, which poses safety risks.
Design a long cargo lifting device with automatic hook unhooking function, including a horizontally arranged lifting beam and an automatic hook unhooking mechanism. The hook can be automatically opened and closed through the cooperation of a hook cylinder, a transmission rod and a return spring. It can be connected to the lifting equipment through a remote controller to realize automated operation.
It improved hoisting efficiency, reduced manual operation time, lowered safety risks, and achieved efficient loading and unloading operations.
Smart Images
Figure CN224172311U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of cargo lifting tools and attachments, and in particular to a long cargo lifting tool with an automatic unhooking function. Background Technology
[0002] Currently, port cargo yards typically use a single-hook lifting method for handling long cargo. To maintain balance, the position of the lifting rope on the long cargo is crucial, ensuring its center of gravity aligns with the center of gravity of the hook above it. However, this single-hook lifting method is inefficient, fails to effectively utilize the lifting capacity of the crane, and the process of securing the long cargo to the lifting rope is time-consuming. Furthermore, unloading long cargo requires manual labor; especially during unloading from a high position, the process of loading and unloading the cargo and detaching the hook takes considerable time, resulting in low efficiency. The swaying of the long cargo during unloading also poses safety risks to workers. Therefore, it is necessary to design specialized attachments for handling long cargo to fully utilize the advantages of the lifting machine, improve operational efficiency, and reduce personnel safety risks. Utility Model Content
[0003] The purpose of this utility model is to provide a long cargo lifting device with an automatic unhooking function that solves the above-mentioned technical problems.
[0004] Therefore, the technical solution of this utility model is as follows:
[0005] A long cargo lifting device with an automatic unhooking function includes a horizontally arranged lifting beam, which is composed of a strip-shaped main beam and two strip beam plates symmetrically fixed at both ends of the main beam and arranged in parallel.
[0006] Multiple hooks are evenly spaced at the bottom of each beam, and a hook-removing mechanism is centrally located on the beam above the multiple hooks; the hook includes a hook body and a stop bar; the top side of the hook body is fixed on a first pin, which is rotatably mounted on the beam; the top of the stop bar is fixed on the beam and closes the opening side of the hook body;
[0007] The hook-unhooking mechanism includes a hook-unhooking cylinder, a first transmission rod, a second transmission rod, a return spring, multiple third transmission rods, and multiple fourth transmission rods. The hook-unhooking cylinder is arranged horizontally, with its piston rod facing the opposite direction to the opening side of the hook body, and its cylinder end is hinged to the beam plate. The second transmission rod is obliquely arranged below the hook-unhooking cylinder, and its rod body has a strip-shaped through hole. The first transmission rod is rotatably mounted on the inner wall of the beam plate, with one end hinged to the piston rod end of the hook-unhooking cylinder and the other end movably disposed in the strip-shaped through hole of the second transmission rod, initially positioned on the hook side connected to the hook mechanism. This causes the first transmission rod to rotate outward through the piston rod of the hook-unhooking cylinder, simultaneously pushing the second transmission rod... The transmission rod moves towards the hook; N third transmission rods are vertically arranged above each hook, with the bottom end of each third transmission rod fixed to the first pin below it and the top end passing through the sixth pin; the top end of the third transmission rod above the hook connected to the hook-unhooking mechanism is hinged to the second transmission rod through the sixth pin on it; multiple fourth transmission rods are horizontally arranged, and are respectively fixed between each two adjacent sixth pins through the two ends of the rod body, so that all the third transmission rods move with the second transmission rod, synchronously driving the hook body to rotate; the two ends of the return spring are respectively connected to the other end of the first transmission rod and the hinge point between the third transmission rod and the second transmission rod, and are initially set in a free state.
[0008] Furthermore, two lifting lug assemblies are symmetrically arranged at the top center of the main beam, each lifting lug assembly consisting of two lifting lugs spaced apart along the length of the main beam.
[0009] Furthermore, the spacing between the two beams is set to 4.5m to 5.5m.
[0010] Furthermore, several rope holes are arranged side by side on the bottom beam wall of the beam plate adjacent to each stop.
[0011] Furthermore, multiple hook mounting parts extend downward at equal intervals on the bottom side of the beam, with the number of hook mounting parts being the same as the number of hooks; each hook mounting part has mounting holes for installing the first pin shaft along the length direction of the main beam.
[0012] Furthermore, the cylinder end of the unhooking cylinder is hinged to the inner wall of the beam plate via the cylinder base, allowing it to swing up and down along the inner wall of the beam plate; the first transmission rod is a broken rod with an obtuse angle, and its bent part is sleeved and rotatably mounted on the fourth pin fixed vertically to the inner wall of the beam plate; one end of the first transmission rod is hinged to the piston rod end of the unhooking cylinder via a third pin set perpendicular to the inner wall of the beam plate.
[0013] Furthermore, the second transmission rod is obliquely arranged, with its high end located adjacent to the piston rod of the hook-unhooking cylinder and its low end located on one side of the hook; a strip-shaped through hole is opened on the rod body near its high end, and a fifth pin is inserted and fixed at the other end of the first transmission rod, which is arranged perpendicular to the inner wall of the beam, so that the other end of the first transmission rod is inserted into the strip-shaped through hole through the fifth pin; the low end of the second transmission rod is hinged to the top of the third transmission rod through a sixth pin arranged perpendicular to the inner wall of the beam.
[0014] Furthermore, each hook is equipped with a lifting rope with loops at both ends, so that one end of the lifting rope is looped onto the hook body and the other end is connected to the lifting rope hole through a shackle connected to the loop.
[0015] Furthermore, the suspension rope is made of nylon.
[0016] Furthermore, the long cargo spreader with automatic unhooking function also includes an unhooking controller; the unhooking controller is installed on the main beam and is electrically connected to the unhooking cylinders on both sides of the unhooking mechanism to synchronously control the piston rods of all unhooking cylinders to extend outward or retract inward; the unhooking controller is equipped with a remote transmission device to communicate with a remote controller in the operator's control room of the crane equipment via wireless transmission.
[0017] Compared with existing technologies, this long cargo spreader with automatic unhooking function can effectively utilize the lifting capacity of the crane by adjusting the number of long cargoes attached according to the maximum lifting capacity of the crane equipment when transporting long cargoes. Furthermore, the operation method using this long cargo spreader only requires manual placement of the cargo onto the spreader; subsequent lifting and unloading operations can be controlled by the crane operator. The entire unloading operation requires no worker assistance, avoiding the time spent by workers loading and unloading cargo, as well as the problems of human-machine coordination and the safety risks posed by cargo swaying during unloading. Based on actual application results, this long cargo spreader increases loading and unloading efficiency by more than double and ensures high on-site safety. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of a vertical structure for simultaneously hoisting multiple cylindrical steel bars using a long cargo lifting device with an automatic unhooking function, as described in an embodiment of this utility model.
[0019] Figure 2 This is a side view of the structure of a long cargo lifting device with automatic unhooking function used in an embodiment of this utility model to simultaneously lift multiple cylindrical steel bars.
[0020] Figure 3This is a front view schematic diagram of a long cargo lifting device with automatic unhooking function used in an embodiment of this utility model to simultaneously lift multiple cylindrical steel bars.
[0021] Figure 4 This is a schematic diagram of the structure of a single-sided hook-unhooking mechanism and its four hooks below it in an embodiment of the present invention for use in a long cargo lifting device with an automatic hook-unhooking function;
[0022] Figure 5 This is a schematic diagram of the structure of the hook-unhooking mechanism of the long cargo lifting device with automatic hook-unhooking function and its hook below it in the initial state (i.e., the hook is in the closed state) in an embodiment of this utility model.
[0023] Figure 6 This is a schematic diagram of the structure of the hook-unhooking mechanism of the long cargo lifting device with automatic hook-unhooking function in an embodiment of the present utility model, and the hook below it is controlled to be in the open state by the hook-unhooking cylinder.
[0024] Figure 7 This is a schematic diagram of the unhooking mechanism of a long cargo lifting device with an automatic unhooking function, and the hook below it, in which the hook is manually controlled to be in the open state according to an embodiment of this utility model. Detailed Implementation
[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but the following embodiments are by no means intended to limit the present invention.
[0026] See Figures 1-3 The long cargo lifting device with automatic hook-off function includes a horizontally arranged lifting beam 1. The lifting beam 1 is composed of a long strip-shaped main beam 101 and two parallel long strip-shaped beam plates 102. The two beam plates 102 are symmetrically fixed on the end faces of the two ends of the main beam 101.
[0027] In this embodiment, the main beam 101 is specifically a hollow steel beam with a cubic structure, and the beam plate 102 is a thick steel plate with an inverted T-shaped structure. The width of its top side plate is the same as the width of the end face of the main beam 101, so that the two beam plates 102, which are symmetrically arranged at both ends of the main beam 101, are fixed to the end faces of the main beam 101 by welding the top side plates.
[0028] Two lifting lug groups 4 are symmetrically arranged at the top center of the main beam 101. Each lifting lug group consists of two lifting lugs spaced apart along the length of the main beam 101.
[0029] Since the main beam 101 not only serves to connect with the lifting equipment, its length directly determines the distance between the two beam plates 102. Preferably, the distance between the two beam plates 102 is set to 5m, which can meet the hoisting requirements corresponding to the length range of common long goods. The length of the beam plate 102 is adapted to the number of hooks 2 arranged on it, which determines the number of long goods hoisted each time.
[0030] See Figure 2 and Figure 4 At the bottom of each beam 102, four hooks 2 are equally spaced along the length of the beam 102; correspondingly, a hook removal mechanism 3 is centrally located on the upper part of the inner side panel of each beam 102; the hook removal mechanism 3 cooperates with the four hooks 2 below it to realize the synchronous drive control of the opening or closing of the four hooks 2 by the hook removal mechanism 3, and through the structural design of the hook removal mechanism 3, the hooks 2 have two usage modes: automatic opening and closing and manual opening and closing.
[0031] See Figure 5 To facilitate the installation of the hook 2, four inverted triangular hook mounting parts 103 are formed on the bottom side of the beam plate 102, which extend downward at equal intervals. The hook mounting parts 103 are provided with mounting holes along the length of the main beam body 101.
[0032] See Figure 5 The hook 2 includes a hook body 201 and a stop bar 202, which together form an openable and closable lifting structure. Specifically, the top of the hook body 201 has a through hole, through which a first pin 203 is inserted and fixed. The first pin 203 is rotatably mounted in the mounting hole of the corresponding hook mounting part 103, so that the hook body 201 rotates synchronously with the first pin 203. The stop bar 202 is vertically mounted on the open side of the hook body 201, and its top end is fixed to the mounting part 103. When the hook 2 is in the hoisting state (i.e., the hook 2 is in the closed state), the stop bar 202 blocks the open side of the hook body 201 to prevent the hoisting rope 6 hanging on the hook body 201 from falling off the hook body 201; while when the hook 2 is in the loading and unloading state (i.e., the hook 2 is in the open state), the hook body 201 rotates to the side away from the stop bar 202 to separate from the stop bar 202. At this time, the hoisting rope 6 can be looped onto the hook body 201 through the gap between the hook body 201 and the stop bar 202, or it can be detached from the hook body 201.
[0033] See Figure 2 and Figure 4 Five rope holes 104 are also provided side by side on the bottom side beam wall of the beam plate 102 located adjacent to each stop bar 202. The rope holes 104 are selected according to the size of the long goods 5. In actual application, a nylon rope 6 is threaded through the handle of each long goods. One end of the rope 6 is connected to one of the rope holes 104 by a buckle, and the other end is hung on the hook body 201 by the rope loop.
[0034] See Figures 5-7 The hook-removing mechanism 3 includes a hook-removing cylinder 302, a first transmission rod 303, a second transmission rod 305, a return spring 310, four third transmission rods 304, and three fourth transmission rods 312.
[0035] As shown in the figure, with the opening side of the hook body 201 located on the right, the hook removal cylinder 302 is horizontally mounted on the inner wall of the beam plate 102 above the hook body 201 with its piston rod facing left. A hydraulic cylinder base 301 is fixed on the inner wall of the beam. The cylinder end of the hook removal cylinder 302 is hinged to the hydraulic cylinder base 301 through a second pin 306 set perpendicular to the inner wall of the beam, so that the hook removal cylinder 302 can swing up and down along the inner wall in the vertical direction around the second pin 306.
[0036] The first transmission rod 303 is a zigzag rod formed by two short rods with an obtuse angle fixedly connected. In this embodiment, the first transmission rod 303 is a zigzag rod formed by two short rods with an included angle of 150° fixedly connected. One end of the first transmission rod 303 is hinged to the piston rod end of the hook-removing cylinder 302 through a third pin 307 set perpendicular to the inner wall of the beam. Its bent part (i.e., the angle formed by the fixed connection of the two short rods) is sleeved on the fourth pin 308 fixed perpendicularly to the inner wall of the beam. When the piston rod of the hook-removing cylinder 302 extends outward, the first transmission rod 303 rotates counterclockwise around the fourth pin 308. The other end of the first transmission rod 303 is provided with a fifth pin 309, which is set in a direction perpendicular to the inner wall of the beam.
[0037] The second transmission rod 305 is obliquely positioned between the hook-unhooking cylinder 302 and the hook 2 with the left end higher than the right end. A strip-shaped through hole is provided on the left side of the second transmission rod 305 along its length. The fifth pin 309 is inserted into the strip-shaped through hole, allowing the other end of the first transmission rod 303 to slide back and forth within the strip-shaped through hole of the second transmission rod 305. In the initial state, the fifth pin 309 is located at the right end of the strip-shaped through hole. To prevent the fifth pin 309 from disengaging from the second transmission rod 305, a limiting ring is fixed at both ends of the fifth pin 309.
[0038] Four third transmission rods 304 are vertically arranged above each hook 2, one for each hook. Each third transmission rod 304 has a sixth pin 311 inserted and fixed at its top end, which is perpendicular to the inner wall of the beam, and a first pin 203 sleeved and fixed at its bottom end. This allows each third transmission rod 304 to drive its corresponding first pin 203 to rotate the hook 201 synchronously. Among the four third transmission rods 304, the top end of the third transmission rod 304 adjacent to the right end of the second transmission rod 305 is hinged to the right end of the second transmission rod 305 through the sixth pin 311. This allows the third transmission rod 304 to rotate directly when the second transmission rod 305 moves to the right.
[0039] Three fourth transmission rods 312 are horizontally arranged, and are respectively sleeved and fixed between each two adjacent sixth pins 311 through pin holes at both ends of the rod body, so that the remaining three third transmission rods 304 are linked with the third transmission rod 304 connected to the right end of the second transmission rod 305, that is, the four third transmission rods 304 rotate synchronously under the movement drive of the second transmission rod 305.
[0040] The return spring 310 is arranged along the length of the second transmission rod 305. One end of the spring is hung on the fifth pin 309, and the other end is hung on the sixth pin 311 which is hinged to the right end of the second transmission rod 305. The return spring 310 is initially set in a free state.
[0041] In this embodiment, the hook-unhooking cylinder 302 is an electric cylinder, and each transmission rod and return spring is made of steel structural components.
[0042] The long cargo lifting device with automatic unhooking function also includes an unhooking controller. The unhooking controller is mounted on the main beam 101 and is electrically connected to the unhooking cylinders 302 of the unhooking mechanism 3 located on the two side beams 302, to synchronously control the piston rods of the two unhooking cylinders 302 to extend outwards or retract inwards. In this embodiment, the unhooking controller is equipped with a remote transmission device, such as, but not limited to, a Bluetooth device or a wireless network transmission device. Correspondingly, a remote controller is installed in the operator's control room of the lifting equipment, which is connected to the unhooking controller via wireless transmission to remotely control the unhooking controller and control the piston rods of the two unhooking cylinders 302 to synchronously extend outwards or retract inwards.
[0043] See Figures 5-7 The working principle of the hook 2, which achieves automatic and manual unhooking through the unhooking mechanism 3, is described in detail below.
[0044] In the initial state, such as Figure 5As shown, the hook 2 is vertically arranged, and the open side of the hook body 201 is blocked by the stop bar 202; in the hook removal mechanism 3, the piston rod of the hook removal cylinder 302 is in a fully retracted state, the first transmission rod 303 is arranged with its obtuse angle pointing upwards, the fifth pin 309 is located on the right end of the strip-shaped through hole on the second transmission rod 305, the third transmission rod 304 is vertically arranged, and the return spring 310 is in a free state.
[0045] When automatic unhooking is required, such as Figure 6 As shown, the piston rod of the hook-unhooking cylinder 302 extends outward to a certain length. During this process, the first transmission rod 303 rotates counterclockwise around the fourth pin 308 and simultaneously pushes the second transmission rod 305 to move obliquely to the right. The third transmission rod 304 connected to the second transmission rod 305 rotates clockwise as the second transmission rod 305 moves obliquely to the right. Based on the linkage control of the three fourth transmission rods 312, the other three third transmission rods 304 also rotate clockwise synchronously. This causes the four third transmission rods 304 to synchronously drive the first pin 203 connected to the bottom and the hook body 201 to rotate clockwise synchronously. At this time, the hook body 201 of all hooks 2 separates from the stop bar 202, and all four hooks 2 are in the open state. Since the bottom of the hook body 201 is inclined downward, the lifting rope can automatically fall off the hook body 201.
[0046] When manual hooking or manual unhooking is required in emergency situations, such as Figure 7As shown, the operator manually pulls one of the hooks 2, rotating the hook body 201 counterclockwise with one hand, separating it from the stop bar 202. With the hook open, the operator can then use their other hand to attach or detach the lifting rope from the hook body 201. During this manual counterclockwise rotation of the single hook body 201, the first pin 203 on the hook 2 simultaneously drives the third transmission rod 304 to rotate clockwise, and drives the second transmission rod 305 to move diagonally to the right. Because the piston rod of the hook-detaching cylinder 302 remains stationary, the first transmission rod 303 and its fifth pin 309 also remain stationary, but... The second transmission rod 305 moves obliquely to the right, and the fifth pin 309 moves relative to the right end of the strip-shaped through hole on the second transmission rod 305 to the left end of the strip-shaped through hole, which causes the distance between the fifth pin 309 and the sixth pin 311 to increase, so that the return spring 310 is in a stretched state. In the above process, based on the linkage control of the three fourth transmission rods 312, the other three third transmission rods 304 also rotate clockwise synchronously, and drive the hook body 201 to rotate clockwise synchronously through the first pin 203 connected to its bottom end, so that all four hooks 2 are in the open state, that is, the hooking or unhooking of the four lifting ropes 6 is completed at one time. When the operator releases the hand that pulled the hook 201, the return spring 310 automatically returns to the free state from the stretched state. During this process, the second transmission rod 305 moves obliquely to the left under the force of the return spring 310, and simultaneously drives the four third transmission rods 304 and the connected first pin 203 to rotate counterclockwise. The hooks 201 of the four hooks 2 then rotate counterclockwise to reset, and their open sides are closed again by the stop rod 202. The fifth pin 309 also returns to the right end of the strip-shaped through hole of the second transmission rod 305.
[0047] Taking the hoisting process of cylindrical steel as an example, the specific steps of the operation method using the aforementioned long cargo lifting device with automatic unhooking function are described as follows:
[0048] S1. Connect the long cargo spreader to the bottom of the lifting equipment and use the lifting equipment to transport it to the top of the cylindrical steel 5 to be lifted. At this time, one end of the lifting rope 6 on the long cargo spreader is connected to the lifting rope hole 104 through the shackle, and the other end hangs down naturally.
[0049] S2. The lifting equipment lowers the long cargo lifting device to an operable height. The on-site operators manually flip the hook body 201 of each hook 2 in turn to open the hook 2 so that the other end of the lifting rope 6 can be passed through the handle of the cylindrical steel 5 and then put on the hook body 201. Then, when the on-site operators release the hook body 201, the hook 2 will close under the action of the return spring 310.
[0050] S3. After all hooks 2 are connected to the cylindrical steel 5, the lifting equipment lifts the long cargo spreader to the designated height and moves it to the designated unloading location. In this step S3, it should be noted that the number of cylindrical steel 5 hanging on the lifting beam 1 is the same as the total number of hooks 2, or it can be less than the total number of hooks 2. This depends on the lifting capacity of the lifting equipment. However, it is necessary to ensure that the cylindrical steel 5 are symmetrically and evenly distributed on the lifting beam 1 to ensure the balance and stability of the lifting beam 1.
[0051] S4. At the unloading location, the lifting equipment lowers the long cargo spreader to the unloading height; the lifting equipment operator remotely controls the unhooking controller to simultaneously extend the piston rod of the unhooking cylinder 302 of each unhooking mechanism, causing the hook 2 to open; under the gravity of the cylindrical steel 5, the other end of the lifting rope 6 detaches from the hook body 201, and the cylindrical steel 5 falls smoothly to the unloading position; then the lifting equipment completes the complete separation of the lifting rope 6 from the cylindrical steel 5 by raising the long cargo spreader.
[0052] S5. The crane operator remotely controls the unhooking controller to make the unhooking cylinders 302 of each unhooking mechanism retract their piston rods in a synchronized manner. At this time, the hook body 201 of the hook 2 returns to the closed state; the long cargo lifting device can continue to be used for the transportation of the next batch of cylindrical steel 5.
Claims
1. A long cargo lifting device with an automatic unhooking function, characterized in that, The system includes a horizontally arranged lifting beam (1), which consists of a strip-shaped main beam (101) and two strip-shaped beam plates (102) symmetrically fixed at both ends of the main beam (101) and arranged in parallel. Multiple hooks (2) are evenly spaced at the bottom of each beam plate (102), and a hook-removing mechanism (3) is centrally located on the beam plate (102) above the multiple hooks (2). Each hook (2) includes a hook body (201) and a stop bar (202). The top side of the hook body (201) is fixed to a first pin, which is rotatably mounted on the beam plate (102). The top of the stop bar (202) is fixed to the beam plate (102) and closes the opening side of the hook body (201); the hook removal mechanism (3) includes a hook removal cylinder (302), a first transmission rod (303), a second transmission rod (305), a return spring (310), multiple third transmission rods (304) and multiple fourth transmission rods (312); the hook removal cylinder (302) is arranged horizontally, its piston rod faces the opposite direction to the opening side of the hook body (201), and its cylinder end is hinged to the beam plate (102); the second transmission rod (305) is inclined to Located below the hook-removing cylinder (302), the rod body has a strip-shaped through hole; the first transmission rod (303) is rotatably mounted on the inner wall of the beam plate (102), one end of which is hinged to the piston rod end of the hook-removing cylinder (302), and the other end is movably mounted in the strip-shaped through hole of the second transmission rod (305), and is initially located on one side of the hook (2) connecting the hook-removing mechanism; N third transmission rods (304) are respectively vertically mounted above each hook (2), the bottom end of each third transmission rod (304) is fixed on the first pin below it, and the top end is fixed on the first pin below it. A sixth pin (311) is inserted; the top end of the third transmission rod (304) on the hook (2) connected to the hook-off mechanism is hinged to the second transmission rod (305) through the sixth pin (311); multiple fourth transmission rods (312) are horizontally arranged, and are respectively fixed between each two adjacent sixth pins (311) through the two ends of the rod body; the two ends of the return spring (310) are respectively connected to the other end of the first transmission rod (303) and the hinge between the third transmission rod (304) and the second transmission rod (305), and are initially set in a free state.
2. The long cargo lifting device with automatic unhooking function according to claim 1, characterized in that, Two lifting lug groups (4) are symmetrically arranged at the top center of the main beam (101). Each lifting lug group consists of two lifting lugs spaced apart along the length of the main beam (101).
3. The long cargo lifting device with automatic unhooking function according to claim 1, characterized in that, Several rope holes (104) are arranged side by side on the bottom beam wall of the beam plate (102) located adjacent to each stop (202).
4. The long cargo lifting device with automatic unhooking function according to claim 1, characterized in that, The bottom side of the beam (102) extends downward at equal intervals and forms multiple hook mounting parts (103), the number of hook mounting parts (103) is the same as the number of hooks (2); each hook mounting part (103) has a mounting hole for mounting the first pin (203) along the length direction of the main beam (101).
5. The long cargo lifting device with automatic unhooking function according to claim 1, characterized in that, The cylinder end of the hook-removing cylinder (302) is hinged to the inner wall of the beam plate (102) through the oil cylinder base (301), so that it can swing up and down along the inner wall of the beam plate (102); the first transmission rod (303) is a broken rod with an obtuse angle, and its bent part is sleeved and rotatably set on the fourth pin (308) which is vertically fixed to the inner wall of the beam; one end of the first transmission rod (303) is hinged to the piston rod end of the hook-removing cylinder (302) through the third pin (307) set vertically to the inner wall of the beam.
6. The long cargo lifting device with automatic unhooking function according to claim 5, characterized in that, The second transmission rod (305) is obliquely arranged, with its high end located next to the piston rod of the hook-removing cylinder (302) and its low end located on one side of the hook (2). The strip-shaped through hole on the second transmission rod (305) is opened on the rod body near its high end. The other end of the first transmission rod (303) is inserted and fixed with a fifth pin (309), which is set in a way that is perpendicular to the inner wall of the beam, so that the other end of the first transmission rod (303) is inserted into the strip-shaped through hole through the fifth pin (309). The low end of the second transmission rod (305) is hinged to the top end of the third transmission rod (304) through a sixth pin (311) set perpendicular to the inner wall of the beam.
7. The long cargo lifting device with automatic unhooking function according to claim 3, characterized in that, Each hook (2) is equipped with a lifting rope (6), with rope loops at both ends, so that one end of the lifting rope (6) is looped onto the hook body (201), and the other end is connected to the lifting rope hole (104) through a shackle connected to the rope loop.
8. The long cargo lifting device with automatic unhooking function according to claim 7, characterized in that, The hoisting rope (6) is made of nylon.
9. The long cargo lifting device with automatic unhooking function according to claim 1, characterized in that, It also includes a hook unhooking controller; the hook unhooking controller is installed on the main beam (101), and is electrically connected to the hook unhooking cylinders (302) on both sides of the hook unhooking mechanism (3) to synchronously control the piston rods of all hook unhooking cylinders (302) to extend outward or retract inward; the hook unhooking controller is equipped with a remote transmission device to communicate with the remote controller installed in the driver's control room of the crane equipment through wireless transmission.