A double-beam portal crane with a manned cage

Abstract

This invention relates to the field of personnel-carrying equipment for double-girder gantry cranes, and discloses a personnel-carrying cage for a double-girder gantry crane, comprising a cage body, the cage body including a base plate, columns fixedly installed at the four corners of the top of the base plate, the tops of the columns fixedly installed at the four corners of the bottom of the top plate, rope suspension mechanisms provided at the four corners of the top of the cage body, two opposing center-of-gravity balancing mechanisms provided at the center of the top of the cage body, and mounting grooves provided on both sides of the bottom of the base plate, with arc-shaped top leaf springs provided on both sides of the interior of the mounting grooves, and one end of the arc-shaped top leaf spring on the left side connected to the inner wall of the mounting groove via a hanger. This invention can achieve emergency locking and buffering in case of rope breakage, graded shock absorption upon landing and adaptability to tilted scenarios, automatically correct the cage's center of gravity, has a reasonable structure, is easy to operate, and comprehensively ensures the safety of personnel transportation.

Description

Technical Field

[0001] This invention relates to the field of personnel-carrying equipment for double-girder gantry cranes, specifically a personnel-carrying cage for double-girder gantry cranes. Background Technology

[0002] In industrial production, construction, and other fields, double-girder gantry cranes are widely used for high-altitude operations such as material handling and equipment installation. The personnel cage, as the core component of the crane for carrying workers during high-altitude operations, directly affects the personal safety of the workers and is an indispensable key piece of equipment in high-altitude work. Currently, most double-girder gantry crane personnel cages on the market adopt a simple frame structure, suspended from the crane's drive end by ropes, primarily realizing the functions of lifting and transporting personnel, meeting basic personnel carrying needs.

[0003] However, existing manned gondolas have numerous safety hazards and performance defects, making them unsuitable for complex high-altitude work scenarios. Regarding rope protection, existing gondolas lack effective emergency measures for rope breakage. When the rope breaks due to wear, overload, or other reasons, it quickly detaches from the suspension mechanism, causing the cage to tilt uncontrollably and fall, leading to serious safety accidents. In terms of cushioning and shock absorption, existing gondolas have simple cushioning structures, often using a single spring, which cannot adapt to different scenarios such as normal landings and extreme falls. Furthermore, during tilted falls, all support structures cannot be simultaneously stressed, easily causing damage to one side of the support and exacerbating the impact on the cage. Regarding center of gravity balance, existing gondolas lack automatic center of gravity adjustment mechanisms, making them prone to swaying and tilting during high-altitude transport due to wind, load shifts, and other factors, increasing the risk of personnel collisions and cage instability. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a personnel cage for a double-girder gantry crane, which solves the problems of existing personnel cages having no effective emergency protection in case of rope breakage, poor buffering effect, and easy tilting and instability at high altitudes, making it difficult to ensure personnel safety.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a personnel cage for a double-girder gantry crane, comprising a cage body, the cage body including a bottom plate, columns fixedly installed at the four corners of the top of the bottom plate, the tops of the columns fixedly installed at the four corners of the bottom of the top plate, rope suspension mechanisms provided at the four corners of the top of the cage body, two opposing center-of-gravity balancing mechanisms provided at the center of the top of the cage body, mounting grooves provided on both sides of the bottom of the bottom plate, arc-shaped top leaf springs provided on both sides of the interior of the mounting grooves, and one end of each arc-shaped top leaf spring on the left side connected to the interior of the mounting groove via a hanger. On the side wall, the bottom end of the arc-shaped top leaf spring is equipped with an arc-shaped stacked leaf spring, and the length of the arc-shaped stacked leaf spring decreases from top to bottom. The rope suspension mechanism includes a mounting block. The bottom of the mounting block is bolted to the top of the top plate. The mounting block has an inner cavity. Clamping arms are movably mounted on both sides of the inner cavity. The top of the clamping arms extends to the outside of the mounting block and is fixedly mounted with a clamping plate. Several needles are fixedly mounted on the inner end of the clamping plate. A rope hook is fixedly mounted on the top of the mounting block. A suspension rope is wound around the middle of the rope hook and a rope breakage sensor is mounted on the suspension rope.

[0006] Preferably, the columns are connected by a wire mesh, and a safety gate is fixedly installed on the front wire mesh.

[0007] Preferably, both sides of the arc-shaped top leaf spring and the arc-shaped stacked leaf spring are fixedly connected by two sets of limiting brackets. The bottom ends of the arc-shaped stacked leaf springs on both sides are fixedly installed on the top two sides of the cross frame. The middle parts of the arc-shaped top leaf spring and the arc-shaped stacked leaf springs are fixedly installed on the top of the cross frame by U-shaped brackets. The bottom ends of the U-shaped brackets are fixedly installed at the four corners of the support plate. Support feet are fixedly installed on both sides of the bottom end of the cross frame.

[0008] Preferably, the other end of the left-side arc-shaped top leaf spring is movably mounted with a first U-shaped connector, the end of the first U-shaped connector is movably mounted with one end of the first crank, and the other end of the first crank is fixedly mounted with one end of the corresponding right-side arc-shaped top leaf spring. The other end of the right-side arc-shaped top leaf spring is movably mounted with a second U-shaped connector, the end of the second U-shaped connector is movably mounted with one end of the second crank, and the other end of the second crank is movably mounted on the inner wall of the mounting groove via a rotating shaft. The middle parts of the corresponding first crank and second crank are movably connected by a connecting rod.

[0009] Preferably, an arc-shaped copper plate is fixedly installed on the outer diameter of the middle part of the clamping arm, and a magnetic ring is fixedly installed in the middle of the suspension rope.

[0010] Preferably, a first magnet is fixedly installed at the bottom of each clamping arm, and an inner waist groove is opened on both sides of the inner bottom of the inner cavity, and a second magnet is fixedly installed on the inner wall of each inner waist groove.

[0011] Preferably, a cylinder is fixedly installed in the middle of the bottom of the inner cavity, pistons are movably installed on both sides of the inner cavity, push rods are fixedly installed on the outer ends of the pistons, the inside of the cylinder is filled with gaseous fuel, an igniter is also fixedly installed inside the cylinder, and a guide wheel is fixedly installed on the top of the top plate near the mounting block.

[0012] Preferably, the center of gravity balancing mechanism includes an outer fixed cylinder, a middle movable cylinder is movably installed inside the outer fixed cylinder, a right positioning block is fixedly installed on one side of the inner layer of the middle movable cylinder, a left positioning block is fixedly installed on the other side of the inner layer of the middle movable cylinder, an inner fixed cylinder is fixedly installed between the right positioning block and the left positioning block, and a cavity is formed between the outer wall of the inner fixed cylinder and the inner wall of the middle movable cylinder.

[0013] Preferably, the right positioning block has a through groove in its inner center, and a counterweight top block is movably installed in the middle of the middle layer movable cylinder by a spring. A valve needle is fixedly installed on the inner end of the counterweight top block and extends into the through groove. A right vent groove is opened on one side of the inside of the right positioning block and the through groove is connected to the cavity through the right vent groove. A left vent groove is opened on one side of the inside of the left positioning block and the inside of the inner fixed cylinder is connected to the cavity through the left vent groove.

[0014] Preferably, a piston rod is fixedly installed on the inner wall of the outer fixed cylinder, the end of the piston rod extends into the interior of the inner fixed cylinder and is fixedly installed with a piston plate, the inner side of the middle movable cylinder is connected to the inner wall of the outer fixed cylinder by two return springs, a pressure stabilizing valve is also fixedly installed on the side wall of the inner fixed cylinder, and bending frames are fixedly installed on both sides of the outer end of the middle movable cylinder, with the ends of the bending frames respectively fixedly installed on both sides of the counterweight.

[0015] This invention provides a personnel cage for a double-girder gantry crane. It has the following advantages: 1. This invention effectively solves the core safety hazard of cage loss of control and fall after rope breakage through multiple emergency designs of the rope suspension mechanism. By first reducing the detachment speed after rope breakage, sufficient reaction time is provided for subsequent emergency locking; then, the spikes on the inside of the clamping plate firmly lock the broken rope, forming a temporary stable connection between the cage and the remaining rope, effectively preventing the cage from tilting or falling, maximizing the safety of the people inside the cage, and providing rapid emergency response and high reliability.

[0016] 2. The arc-shaped top leaf spring and the arc-shaped stacked leaf spring combination structure at the bottom of the base plate of this invention achieve graded buffering in different scenarios, significantly improving the stability and safety of the cage upon landing. By employing the synchronous deformation of the arc-shaped top leaf spring and all the arc-shaped stacked leaf springs, multiple springs share the impact force, and the friction between the stacked springs dissipates a large amount of falling energy. Simultaneously, the gentle rebound characteristics effectively weaken the impact force, reducing the probability of cage deformation and personnel injury.

[0017] 3. The center of gravity balancing mechanism of the present invention can respond to the swaying and tilting of the cage in the air in real time, quickly restore the balance state, and ensure the safety of passengers. Attached Figure Description

[0018] Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram of the bottom buffer and shock absorption structure of the cage in this invention; Figure 3 This is a schematic diagram of the rope suspension mechanism in this invention; Figure 4 This is a schematic diagram of the internal structure of the rope suspension mechanism in this invention; Figure 5 This is a schematic diagram of the center-of-gravity balancing mechanism in this invention; Figure 6 for Figure 5 Enlarged view of point A in the middle.

[0019] Among them, 1. Cage body; 101. Bottom plate; 102. Column; 103. Top plate; 104. Wire mesh; 105. Safety door; 2. Rope suspension mechanism; 201. Mounting block; 202. Inner cavity; 203. Clamping arm; 204. Clamping plate; 205. Spike; 206. Rope hook; 207. Suspension rope; 208. Arc-shaped copper plate; 209. Magnetic ring; 210. First magnet; 211. Inner waist groove; 212. Second magnet; 213. Cylinder; 214. Piston; 215. Push rod; 216. Gaseous fuel; 217. Ignition device; 218. Guide wheel; 3. Center of gravity balancing mechanism; 301. Outer fixed cylinder; 302. Middle layer movable cylinder; 30 3. Right positioning block; 304. Left positioning block; 305. Inner fixed cylinder; 306. Through groove; 307. Counterweight top block; 308. Valve needle; 309. Right vent groove; 310. Left vent groove; 311. Cavity; 312. Piston rod; 313. Piston plate; 314. Return spring; 315. Pressure regulating valve; 316. Bending frame; 317. Counterweight block; 4. Mounting groove; 5. Arc-shaped top leaf spring; 6. Arc-shaped stacked leaf spring; 7. Limiting frame; 8. Cross frame; 9. U-shaped bracket; 10. Support plate; 11. First U-shaped connector; 12. First crank; 13. Second U-shaped connector; 14. Second crank; 15. Connecting rod; 16. Support foot. Detailed Implementation

[0020] The technical solutions in 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. Example:

[0021] Please see the appendix Figure 1 -Appendix Figure 6 This invention provides a personnel cage for a double-girder gantry crane, such as... Figure 1As shown, the cage includes a cage body 1, which includes a bottom plate 101. Columns 102 are fixedly installed at the four corners of the top of the bottom plate 101. The tops of the columns 102 are fixedly installed at the four corners of the bottom of a top plate 103. Rope suspension mechanisms 2 are provided at the four corners of the top of the cage body 1. Two opposing center-of-gravity balancing mechanisms 3 are provided at the center of the top of the cage body 1. Mounting grooves 4 are provided on both sides of the bottom of the bottom of the bottom plate 101. Arc-shaped top leaf springs 5 ​​are provided on both sides of the interior of the mounting grooves 4, with one end of the left arc-shaped top leaf spring 5 connected to the inner wall of the mounting groove 4 via a hanger. Arc-shaped stacked leaf springs 6 are installed at the bottom of the arc-shaped top leaf springs 5. The length of the spring 6 decreases from top to bottom. The rope suspension mechanism 2 includes a mounting block 201. The bottom of the mounting block 201 is bolted to the top of the top plate 103. The mounting block 201 has an inner cavity 202. Clamping arms 203 are movably mounted on both sides of the inner cavity 202. The top of the clamping arms 203 extends to the outside of the mounting block 201 and is fixedly mounted with clamping plates 204. Several needles 205 are fixedly mounted on the inner side of the clamping plates 204. A rope hook 206 is fixedly mounted on the top of the mounting block 201. A suspension rope 207 is wound around the middle of the rope hook 206 and a rope breakage sensor is mounted on the suspension rope 207. The cage 1, as the core component for carrying personnel, consists of a base plate 101, uprights 102, and a top plate 103, forming a stable frame structure that provides a safe riding space for the staff inside. The base plate 101 bears the weight of the personnel, while the uprights 102 support the top plate 103 and connect to the base plate 101, ensuring the overall structural strength of the cage 1 and preventing deformation during high-altitude transportation. Rope suspension mechanisms 2 at the four corners of the top of the cage 1 connect to the suspension ropes 207, enabling the suspension and lifting of the cage 1. The symmetrical arrangement of the four rope suspension mechanisms 2 ensures even force distribution on the suspension ropes 207, reducing the probability of the cage 1 swaying in the air. Two opposing center-of-gravity balancing mechanisms 3 at the top center of the cage 1 automatically adjust the center of gravity when the cage 1 tilts, quickly restoring balance and ensuring the safety of the personnel. The mounting grooves 4 on both sides of the bottom end of the base plate 101 provide installation space for the arc-shaped top leaf spring 5 and the arc-shaped laminated leaf spring 6. The arc-shaped top leaf spring 5 on the left side is fixed to the inner wall of the mounting groove 4 by a hanger to ensure that the arc-shaped top leaf spring 5 is firmly installed. The arc-shaped top leaf spring 5 and the arc-shaped laminated leaf spring 6 work together to buffer and absorb shock when the cage 1 lands or falls. The length of the arc-shaped laminated leaf spring 6 decreases from top to bottom, which can achieve graded buffering and better absorb impact force.The mounting block 201 in the rope suspension mechanism 2 is fixed to the top of the top plate 103 by bolts, which is reliable and easy to disassemble and maintain. The inner cavity 202 provides installation space for components such as the clamping arm 203 and the cylinder 213. The clamping arm 203 can rotate flexibly in the inner cavity 202. The clamping plate 204 at its top is used to clamp the suspension rope 207. The needles 205 on the inner side of the clamping plate 204 can enhance the clamping friction and ensure that the suspension rope 207 can be firmly held after it breaks. The rope hook 206 is used to wrap the suspension rope 207. The rope breakage sensor on the suspension rope 207 can monitor the stress state of the suspension rope 207 in real time. When the suspension rope 207 breaks, it quickly sends a signal to trigger subsequent emergency protection actions.

[0022] In this embodiment, the connected columns 102 are connected by a wire mesh 104, and a safety door 105 is fixedly installed on the front wire mesh 104. The wire mesh 104 between the connected columns 102 can enclose the cage 1 on all sides, preventing workers from accidentally falling during high-altitude transportation. At the same time, the wire mesh 104 has a certain degree of ventilation and light transmission, making it easy for workers to observe the external environment, and can also reduce the weight of the cage 1 itself, without affecting the lifting efficiency of the crane. The safety door 105 on the front wire mesh 104 is the passage for workers to enter and exit the cage 1. When the safety door 105 is closed, a closed safety space is formed, preventing personnel from falling due to accidental opening of the safety door 105 during transportation, thus improving the safety of the cage 1. The installation position of the safety door 105 conforms to ergonomics, making it easy for workers to open and close.

[0023] Furthermore, both sides of the arc-shaped top leaf spring 5 and the arc-shaped stacked leaf spring 6 are fixedly connected by two sets of limiting brackets 7. The bottom ends of the arc-shaped stacked leaf springs 6 on both sides are fixedly installed on the top of the cross frame 8. The middle parts of the arc-shaped top leaf spring 5 and the arc-shaped stacked leaf spring 6 are fixedly installed on the top of the cross frame 8 by U-shaped brackets 9. The bottom ends of the U-shaped brackets 9 are fixedly installed at the four corners of the support plate 10. Support feet 16 are fixedly installed on both sides of the bottom end of the cross frame 8. The limiting brackets 7 are used to fix the sides of the arc-shaped top leaf spring 5 and the arc-shaped stacked leaf spring 6 to prevent them from shifting when deformed under force, thus ensuring the stability of the buffer structure. The two sets of limiting brackets 7 are symmetrically arranged, which can make the arc-shaped top leaf spring 5 and the arc-shaped stacked leaf spring 6 bear force evenly and avoid damage caused by excessive force on one side. The bottom ends of the two curved laminated leaf springs 6 are fixed to the top sides of the cross frame 8. The cross frame 8 serves to connect and support the curved laminated leaf springs 6, transferring the force of the curved laminated leaf springs 6 to the support feet 16. The U-shaped bracket 9 is used to fix the middle of the curved top leaf spring 5 and the curved laminated leaf springs 6, further enhancing the robustness of the buffer structure and preventing the curved top leaf spring 5 and the curved laminated leaf springs 6 from falling off during the buffering process. The support plate 10 is used to support the U-shaped bracket 9, dispersing the force on the U-shaped bracket 9 and preventing the U-shaped bracket 9 from deforming due to excessive force. The support feet 16 on both sides of the bottom end of the cross frame 8 are in direct contact with the ground. When the cage 1 lands, the support feet 16 are the first to contact the ground, transferring the weight of the cage 1 to the ground. At the same time, in conjunction with the buffering effect of the curved top leaf spring 5 and the curved laminated leaf springs 6, the cage 1 lands smoothly. The support feet 16 are made of wear-resistant material, which can extend their service life and prevent wear and deformation after long-term use.

[0024] Furthermore, a first U-shaped connector 11 is movably mounted on the other end of each left-side arc-shaped top leaf spring 5. The end of each first U-shaped connector 11 is movably mounted on one end of the first crank 12, and the other end of the first crank 12 is fixedly mounted on one end of the corresponding right-side arc-shaped top leaf spring 5. A second U-shaped connector 13 is movably mounted on the other end of each right-side arc-shaped top leaf spring 5. The end of each second U-shaped connector 13 is movably mounted on one end of the second crank 14, and the other end of the second crank 14 is movably mounted on the inner wall of the mounting groove 4 via a pivot. The middle portions of the corresponding first crank 12 and second crank 14 are movably connected via a connecting rod 15. The first U-shaped connector 11 connects the left-side arc-shaped top leaf spring 5 and the first crank 12, allowing the force on the left-side arc-shaped top leaf spring 5 to be transmitted to the first crank 12, while also allowing relative rotation between the left-side arc-shaped top leaf spring 5 and the first crank 12, thus preventing damage to components due to rigid connection. The other end of the first crank 12 is fixed to one end of the corresponding right side arc-shaped top leaf spring 5, which can transmit the movement of the left side arc-shaped top leaf spring 5 to the right side arc-shaped top leaf spring 5. The second U-shaped connector 13 is used to connect the right side arc-shaped top leaf spring 5 and the second crank 14. Its function is the same as that of the first U-shaped connector 11, ensuring that the right side arc-shaped top leaf spring 5 and the second crank 14 can rotate flexibly. The second crank 14 is movably mounted on the inner wall of the mounting slot 4 via a rotating shaft, allowing the second crank 14 to rotate around the rotating shaft. The connecting rod 15 connects the first crank 12 and the second crank 14 on the corresponding side, realizing the linkage between the first crank 12 and the second crank 14. When the cage 1 tilts and falls, the support foot 16, cross frame 8, arc-shaped top leaf spring 5 and arc-shaped laminated leaf spring 6 on one side are lifted, driving the first crank 12 to rotate through the first U-shaped connector 11. The first crank 12 drives the second crank 14 to rotate through the connecting rod 15, thereby driving the support foot 16, cross frame 8, arc-shaped top leaf spring 5 and arc-shaped laminated leaf spring 6 on the other side to descend, so that all support feet 16 can contact the ground and participate in the buffering, avoiding excessive pressure on one side of the support foot 16.

[0025] Furthermore, an arc-shaped copper plate 208 is fixedly installed on the outer diameter of the middle part of the clamping arm 203, and a magnetic ring 209 is fixedly installed on the middle part of the suspension rope 207. The arc-shaped copper plate 208 in the middle of the clamping arm 203 and the magnetic ring 209 on the suspension rope 207 cooperate to form an electromagnetic buffer structure. When the suspension rope 207 breaks, the suspension rope 207 drives the magnetic ring 209 to move. During the movement of the magnetic ring 209, the magnetic flux of the arc-shaped copper plates 208 on both sides changes. According to Faraday's law of electromagnetic induction, eddy currents will be generated in the arc-shaped copper plate 208. The eddy currents will excite a reverse magnetic field. According to Lenz's law, the reverse magnetic field will hinder the movement of the magnetic ring 209, thereby generating a reverse electromagnetic force, which slows down the detachment speed of the suspension rope 207 after it breaks. This provides sufficient reaction time for the clamping plate 204 to lock the suspension rope 207, and prevents the cage 1 from falling out of control due to the rapid detachment of the suspension rope 207. The arc-shaped structure of the arc-shaped copper plate 208 is compatible with the shape of the magnetic ring 209, which can enhance the electromagnetic induction effect and improve the buffer reliability.

[0026] Furthermore, a first magnet 210 is fixedly installed at the bottom of each clamping arm 203, and an inner waist groove 211 is opened on both sides of the inner bottom of the inner cavity 202. A second magnet 212 is fixedly installed on the inner wall of each inner waist groove 211. The first magnet 210 at the bottom of the clamping arm 203 and the second magnet 212 on the inner wall of the inner groove 211 cooperate to fix the clamping arm 203 after rotation. When the suspension rope 207 breaks and triggers an emergency action, the push rod 215 pushes the bottom of the clamping arm 203 to rotate outward. When the clamping arm 203 rotates to the designated position, the first magnet 210 and the second magnet 212 attract each other and fix the clamping arm 203, ensuring that the clamping plate 204 can stably clamp the suspension rope 207 and prevent the clamping arm 203 from loosening due to vibration, which would cause the suspension rope 207 to fall off. The inner groove 211 provides installation space for the second magnet 212 and facilitates the movement of the bottom of the clamping arm 203 during rotation, avoiding interference with the bottom of the inner cavity 202. The attraction force of the first magnet 210 and the second magnet 212 is moderate, which can ensure that the clamping arm 203 is firmly fixed and facilitate separation during subsequent reset.

[0027] Furthermore, a cylinder 213 is fixedly installed in the middle of the bottom of the inner cavity 202. Pistons 214 are movably installed on both sides of the inner cavity 213. Push rods 215 are fixedly installed on the outer ends of the pistons 214. The cylinder 213 is filled with gaseous fuel 216. An igniter 217 is also fixedly installed inside the cylinder 213. A guide wheel 218 is fixedly installed on the top of the top plate 103 near the mounting block 201. The cylinder 213 is an emergency drive component. The gaseous fuel 216 inside it expands rapidly after ignition, pushing the pistons 214 on both sides to move outward. The pistons 214 drive the push rod 215 to move outward in sync. The push rod 215 pushes the bottom of the clamping arm 203 to rotate, thereby causing the clamping plate 204 to tighten inward, thus locking the hoisting rope 207. The igniter 217 is used to ignite the gaseous fuel 216. Its trigger signal comes from the rope breakage sensor on the hoisting rope 207. When the rope breakage sensor detects that the hoisting rope 207 has broken, it immediately sends a signal to the igniter 217, which ignites quickly to ensure the timeliness of the emergency action. The guide wheel 218 at the top of the top plate 103 is used to guide the direction of the hoisting rope 207, so as to avoid the hoisting rope 207 from rubbing against the mounting block 201, the top plate 103 and other components during the lifting and transportation process, reduce the wear of the hoisting rope 207, and extend the service life of the hoisting rope 207. At the same time, the guide wheel 218 can keep the hoisting rope 207 taut, ensure that the hoisting rope 207 is evenly stressed, and reduce the swaying of the cage 1 in the air.

[0028] Furthermore, the center of gravity balancing mechanism 3 includes an outer fixed cylinder 301, inside which a middle movable cylinder 302 is movably installed. A right positioning block 303 is fixedly installed on one side of the inner cavity of the middle movable cylinder 302, and a left positioning block 304 is fixedly installed on the other side of the inner cavity of the middle movable cylinder 302. An inner fixed cylinder 305 is fixedly installed between the right positioning block 303 and the left positioning block 304. A cavity 311 is formed between the outer wall of the inner fixed cylinder 305 and the inner wall of the middle movable cylinder 302. The outer fixed cylinder 301 is the fixed foundation of the center of gravity balancing mechanism 3, used to install and support components such as the middle movable cylinder 302, ensuring the overall structural stability of the center of gravity balancing mechanism 3. The outer fixed cylinder 301 is fixed to the top plate 103 of the cage 1 and moves synchronously with the cage 1. The middle movable cylinder 302 can move flexibly inside the outer fixed cylinder 301. Its movement drives the counterweight block 317 to move synchronously, thereby adjusting the center of gravity of the cage. The right positioning block 303 and the left positioning block 304 are fixed inside the middle movable cylinder 302 to fix the inner fixed cylinder 305 and ensure that the inner fixed cylinder 305 is firmly installed. The inner fixed cylinder 305 is used to accommodate the piston rod 312 and the piston plate 313. The cavity 311 between the inner fixed cylinder 305 and the middle movable cylinder 302 is used to accommodate gas, so as to realize the flow of gas and pressure regulation, and provide power for the adjustment of the center of gravity.

[0029] Furthermore, a through groove 306 is provided in the middle of the right positioning block 303, and a counterweight top block 307 is movably installed in the middle of the middle layer movable cylinder 302 by a spring. A valve needle 308 is fixedly installed on the inner end of the counterweight top block 307 and extends into the interior of the through groove 306. A right vent groove 309 is provided on one side of the interior of the right positioning block 303, and the through groove 306 is connected to the cavity 311 through the right vent groove 309. A left vent groove 310 is provided on one side of the interior of the left positioning block 304, and the interior of the inner fixed cylinder 305 is connected to the cavity 311 through the left vent groove 310. The through groove 306 in the right positioning block 303 is used to accommodate the valve needle 308. The position of the valve needle 308 determines the opening and closing of the through groove 306, thereby controlling the gas flow between the cavity 311 and the inner fixed cylinder 305. The counterweight top block 307 is movably installed in the middle of the middle layer movable cylinder 302 by a spring and can slide under the action of gravity. When the cage 1 tilts, the counterweight top block 307 slides to the tilted side under the influence of gravity, driving the valve needle 308 to move, opening the through groove 306, so that the cavity 311 is connected to one side of the inner fixed cylinder 305 through the right vent groove 309 and the through groove 306. At the same time, the cavity 311 is connected to the other side of the inner fixed cylinder 305 through the left vent groove 310, realizing the gas flow on both sides of the inner fixed cylinder 305, providing conditions for the movement of the piston plate 313. The right vent groove 309 and the left vent groove 310 are used to connect the through groove 306 with the cavity 311 and the inner fixed cylinder 305 with the cavity 311, respectively, to ensure that the gas can flow smoothly and to ensure the smooth operation of the center of gravity adjustment.

[0030] Furthermore, a piston rod 312 is fixedly installed on the inner wall of the outer fixed cylinder 301. The end of the piston rod 312 extends into the interior of the inner fixed cylinder 305 and is fixedly installed with a piston plate 313. The inner side of the middle movable cylinder 302 is connected to the inner wall of the outer fixed cylinder 301 by two return springs 314. A pressure stabilizing valve 315 is also fixedly installed on the side wall of the inner fixed cylinder 305. Bending frames 316 are fixedly installed on both sides of the outer end of the middle movable cylinder 302, and the ends of the bending frames 316 are fixedly installed on both sides of the counterweight 317. The piston rod 312 on the inner wall of the outer fixed cylinder 301 is fixed, while the piston plate 313 at its end can move inside the inner fixed cylinder 305. When the two sides of the inner fixed cylinder 305 are connected, the gas pressure difference pushes the piston plate 313 to move. Since the piston rod 312 and the outer fixed cylinder 301 are fixed, the movement of the piston plate 313 will push the middle movable cylinder 302 to move in the opposite direction. The middle movable cylinder 302 drives the counterweight 317 to move through the bending frame 316, thereby correcting the center of gravity of the cage. Two return springs 314 are symmetrically connected between the middle movable cylinder 302 and the outer fixed cylinder 301 for the reset of the middle movable cylinder 302. When the cage 1 returns to balance, the return springs 314 pull the middle movable cylinder 302 back to its initial position, thereby resetting the counterweight 317. The pressure stabilizing valve 315 is used to stabilize the gas pressure in the inner fixed cylinder 305 and the cavity 311, preventing excessively high or low gas pressure from affecting the center of gravity adjustment effect. Simultaneously, after the cage 1 returns to balance, the pressure stabilizing valve 315 directly connects the inner fixed cylinder 305 and the cavity 311, facilitating gas flow and assisting the middle layer movable cylinder 302 in resetting. The bending frame 316 connects the middle layer movable cylinder 302 and the counterweight 317, ensuring that the counterweight 317 can move synchronously with the middle layer movable cylinder 302. The bending frame 316 has high structural strength and can withstand the weight of the counterweight 317 and the impact force during movement, preventing deformation or breakage. The counterweight 317 adjusts the center of gravity position of the cage 1 through the movement of its own weight, ensuring that the cage 1 can quickly return to balance.

[0031] Working principle: Connect four hoisting ropes 207 to the drive end slide of the double-girder gantry crane. After the worker opens the safety door 105 and enters the cage 1, close the safety door 105. The crane will then lift the cage 1 and transport the personnel.

[0032] During transportation, if one of the suspension ropes 207 breaks, since the rope 207 is suspended and both ends experience the same tension, the most vulnerable point for breakage is the connection between the rope 207 and the hook 206. After breakage, the end of the rope 207 will move, causing the magnetic ring 209 to move as well. The movement of the magnetic ring 209 will cause the magnetic flux of the curved copper plates 208 on both sides to change with position, generating eddy currents according to Faraday's law of electromagnetic induction. These eddy currents will induce a reverse magnetic field, which, following Lenz's law, opposes the movement of the magnetic ring 209 that causes the change in magnetic flux. The reverse magnetic field interacts with the original magnetic field of the magnetic ring 209, generating a reverse electromagnetic force that further hinders the movement of the magnetic ring 209 and the suspension rope 207, thus significantly reducing the risk of breakage. 7. After the rope breaks, the rope breakage sensor on the rope 207 responds quickly, the igniter 217 ignites the gaseous fuel 216, the cylinder 213 expands rapidly, driving the pistons 214 and push rods 215 on both sides to move outward. The push rods 215 push the bottom of the clamping arm 203 and make it rotate outward synchronously. The first magnet 210 and the second magnet 212 are used to attract and fix it. The middle part of the clamping arm 203 is installed with a rotating shaft, so that the top of the clamping arm 203 rotates inward synchronously, driving the clamping plate 204 to rotate inward synchronously. With the help of the spikes 205 on the inner side of the clamping plate 204, the broken rope 207 is locked, forming a temporary connection structure between the top of the cage 1 and the rope 207, preventing the cage 1 from tilting and causing an accident.

[0033] When cage 1 lands normally on the ground, the support foot 16 contacts the ground. At this time, the weight of cage 1 is only applied to the uppermost curved top leaf spring 5. The impact force causes the curved top leaf spring 5 to press down and absorb energy, and then quickly rebounds to release the energy, achieving a stable landing of cage 1. In extreme cases where cage 1 falls directly from the air, the powerful impact force will cause the curved top leaf spring 5 and all the curved laminated leaf springs 6 to deform, so that each leaf spring shares the impact force. The leaves between the curved laminated leaf springs 6 will quickly rub against each other to eliminate a large amount of energy. The larger impact force will also make the rebound of the curved laminated leaf springs 6 more gentle, greatly reducing the energy generated when cage 1 falls. To reduce the impact force and improve safety, when the cage 1 falls in an inclined state, the support foot 16, cross frame 8, arc-shaped top leaf spring 5 and arc-shaped laminated leaf spring 6 on one side will be lifted first. The first U-shaped connector 11 will drive one end of the first crank 12 to press down and rotate. The other end of the first crank 12 will drive one end of the second crank 14 to rotate through the connecting rod 15, so that the other end of the second crank 14 presses down on the second U-shaped connector 13, thereby causing the support foot 16, cross frame 8, arc-shaped top leaf spring 5 and arc-shaped laminated leaf spring 6 on the other side to descend, so that all support feet 16 can contact the ground and participate in absorbing the impact force, avoiding excessive pressure on one side of the support foot 16.

[0034] When cage 1 sways and tilts in the air, such as when it tilts to the left, the counterweight block 307 in the front center of gravity balancing mechanism 3 slides to the left due to gravity, causing the valve needle 308 to move accordingly. As the valve needle 308 moves, the cavity 311 connects to one side of the inner fixed cylinder 305 through the right vent groove 309 and the through groove 306. Meanwhile, the other side of the cavity 311 connects to the other side of the inner fixed cylinder 305 through the left vent groove 310. At this time, the two sides of the inner fixed cylinder 305 are connected, and the air pressure is the same. According to the gas pressure formula, the force exerted on the piston plate 313 by the air pressure on one side of the inner fixed cylinder 305 is the product of the pressure and the complete area of ​​the piston plate 313. The force exerted on the piston plate 313 by the air pressure on the other side of the inner fixed cylinder 305 is the product of the pressure and the area of ​​the piston plate 313 minus the cross-sectional area of ​​the piston rod 312. Therefore, one The greater pressure generated in the side space will push the piston plate 313 to move and compress the space on the other side of the inner fixed cylinder 305. Since the piston plate 313 and the outer fixed cylinder 301 themselves cannot move, they will push the middle movable cylinder 302 to move in the opposite direction. When the middle movable cylinder 302 moves, it will drive the counterweight block 317 to move to the right through the bending frame 316. By moving the position of the counterweight block 317 in the opposite direction, the center of gravity of the cage 1 will shift to the right when it tilts to the left, thereby quickly maintaining balance. Similarly, when the cage 1 tilts to the right, the rear center of gravity balancing mechanism 3 is triggered, causing the center of gravity of the cage 1 to shift to the left. After the balance is completed, the counterweight top block 307 and the valve needle 308 are reset by the spring, the through groove 306 is closed, and at the same time the pressure regulating valve 315 directly connects the inner fixed cylinder 305 and the cavity 311. Under the action of the reset spring 314, the middle movable cylinder 302 and the counterweight block 317 are reset.

[0035] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A personnel cage for a double-girder gantry crane, comprising a cage body (1), characterized in that, The cage (1) includes a bottom plate (101). Columns (102) are fixedly installed at the four corners of the top of the bottom plate (101). The tops of the columns (102) are fixedly installed at the four corners of the bottom of the top plate (103). Rope suspension mechanisms (2) are provided at the four corners of the top of the cage (1). Two opposing center-of-gravity balancing mechanisms (3) are provided in the middle of the top of the cage (1). Mounting grooves (4) are provided on both sides of the bottom of the bottom of the bottom plate (101). Arc-shaped top leaf springs (5) are provided on both sides of the interior of the mounting grooves (4). One end of the arc-shaped top leaf spring (5) on the left side is connected to the inner wall of the mounting groove (4) by a hanger. Arc-shaped stacked leaf springs (6) are installed at the bottom of the arc-shaped top leaf springs (5). The length decreases from top to bottom. The rope suspension mechanism (2) includes a mounting block (201). The bottom of the mounting block (201) is bolted to the top of the top plate (103). The mounting block (201) has an inner cavity (202). Clamping arms (203) are movably installed on both sides of the inner cavity (202). The top of the clamping arms (203) extends to the outside of the mounting block (201) and is fixedly installed with clamping plates (204). Several needles (205) are fixedly installed on the inner side of the clamping plates (204). A rope hook (206) is fixedly installed on the top of the mounting block (201). A suspension rope (207) is wound around the middle of the rope hook (206) and a rope breakage sensor is installed on the suspension rope (207).

2. The personnel cage for a double-girder gantry crane according to claim 1, characterized in that, The columns (102) are connected by wire mesh (104), and a safety door (105) is fixedly installed on the front wire mesh (104).

3. The personnel cage for a double-girder gantry crane according to claim 1, characterized in that, The two sides of the arc-shaped top leaf spring (5) and the arc-shaped stacked leaf spring (6) are fixedly connected by two sets of limiting brackets (7). The bottom ends of the arc-shaped stacked leaf springs (6) on both sides are fixedly installed on the top two sides of the cross frame (8). The middle parts of the arc-shaped top leaf spring (5) and the arc-shaped stacked leaf spring (6) are fixedly installed on the top of the cross frame (8) by U-shaped brackets (9). The bottom ends of the U-shaped brackets (9) are fixedly installed at the four corners of the support plate (10). Support feet (16) are fixedly installed on both sides of the bottom end of the cross frame (8).

4. The personnel cage for a double-girder gantry crane according to claim 1, characterized in that, The other end of the arc-shaped top leaf spring (5) on the left side is movably mounted with a first U-shaped connector (11). The end of the first U-shaped connector (11) is movably mounted with one end of the first crank (12), and the other end of the first crank (12) is fixedly mounted with one end of the arc-shaped top leaf spring (5) on the corresponding side on the right side. The other end of the arc-shaped top leaf spring (5) on the right side is movably mounted with a second U-shaped connector (13). The end of the second U-shaped connector (13) is movably mounted with one end of the second crank (14), and the other end of the second crank (14) is movably mounted on the inner wall of the mounting groove (4) through a rotating shaft. The middle parts of the first crank (12) and the second crank (14) on the corresponding side are movably connected by a connecting rod (15).

5. A personnel cage for a double-girder gantry crane according to claim 1, characterized in that, An arc-shaped copper plate (208) is fixedly installed on the outer diameter of the middle part of the clamping arm (203), and a magnetic ring (209) is fixedly installed on the middle part of the suspension rope (207).

6. A personnel cage for a double-girder gantry crane according to claim 1, characterized in that, The bottom of each clamping arm (203) is fixedly equipped with a first magnet (210), and the inner bottom of the inner cavity (202) is provided with an inner waist groove (211) on both sides. The inner wall of the inner waist groove (211) is fixedly equipped with a second magnet (212).

7. A personnel cage for a double-girder gantry crane according to claim 1, characterized in that, A cylinder (213) is fixedly installed in the middle of the bottom of the inner cavity (202). Pistons (214) are movably installed on both sides of the inner cavity (213). Push rods (215) are fixedly installed on the outer ends of the pistons (214). The cylinder (213) is filled with gaseous fuel (216). An igniter (217) is also fixedly installed inside the cylinder (213). A guide wheel (218) is fixedly installed on the top of the top plate (103) near the mounting block (201).

8. A personnel cage for a double-girder gantry crane according to claim 1, characterized in that, The center of gravity balancing mechanism (3) includes an outer fixed cylinder (301), a middle movable cylinder (302) is movably installed inside the outer fixed cylinder (301), a right positioning block (303) is fixedly installed on one side of the middle movable cylinder (302), a left positioning block (304) is fixedly installed on the other side of the middle movable cylinder (302), an inner fixed cylinder (305) is fixedly installed between the right positioning block (303) and the left positioning block (304), and a cavity (311) is formed between the outer wall of the inner fixed cylinder (305) and the inner wall of the middle movable cylinder (302).

9. A personnel cage for a double-girder gantry crane according to claim 8, characterized in that, The right positioning block (303) has a through groove (306) in the middle. The middle layer movable cylinder (302) has a counterweight top block (307) installed in the middle by a spring. The inner end of the counterweight top block (307) is fixedly installed with a valve needle (308) and the valve needle (308) extends into the through groove (306). The right positioning block (303) has a right vent groove (309) on one side inside and the through groove (306) is connected to the cavity (311) through the right vent groove (309). The left positioning block (304) has a left vent groove (310) on one side inside and the inner fixed cylinder (305) is connected to the cavity (311) through the left vent groove (310).

10. A personnel cage for a double-girder gantry crane according to claim 9, characterized in that, A piston rod (312) is fixedly installed on the inner wall of the outer fixed cylinder (301). The end of the piston rod (312) extends into the interior of the inner fixed cylinder (305) and is fixedly installed with a piston plate (313). The inner side of the middle layer movable cylinder (302) is connected to the inner wall of the outer fixed cylinder (301) by two return springs (314). A pressure stabilizing valve (315) is also fixedly installed on the side wall of the inner fixed cylinder (305). Bending frames (316) are fixedly installed on both sides of the outer end of the middle layer movable cylinder (302), and the ends of the bending frames (316) are fixedly installed on both sides of the counterweight (317).

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