A flat head portal crane

Abstract

This invention discloses a flat-top gantry crane, relating to the field of crane technology. It includes a tower body, a gantry frame mounted at the lower end of the tower body, a slewing support mounted at the upper end of the tower body, a machine platform mounted at the upper end of the slewing support, a machine room mounted at the upper end of the machine platform, a boom mounted at the front end of the machine platform, a luffing device installed inside the boom, a second luffing wire rope and a first luffing wire rope mounted on the left and right sides of the luffing device respectively, a luffing trolley mounted at one end of the second luffing wire rope, the luffing trolley being slidably connected to the lower end of the boom, and one end of the first luffing wire rope being connected to the luffing trolley. A hook is mounted at the lower end of the luffing trolley via a hoisting wire rope. This invention, through a series of structural features, significantly reduces the luffing resistance of horizontal traction compared to a boom-tilting type, reduces the motor power of the luffing mechanism, and increases the luffing speed, thereby greatly improving work efficiency.

Description

Technical Field

[0001] This invention relates to the field of crane technology, specifically to a flat-top gantry crane. Background Technology

[0002] A crane is a heavy-duty machine that uses mechanical or hydraulic transmission systems and actuators such as wire ropes and hydraulic cylinders to vertically lift, horizontally move, or swing heavy objects in space. Its core function is to perform material handling, loading and unloading, and installation operations, and it is widely used in construction, port logistics, factory manufacturing, mining, and other fields.

[0003] Conventional gantry cranes can be categorized by boom type into boom-tilt gantry cranes and four-bar linkage gantry cranes. Each type has its own advantages and disadvantages. For example, boom-tilt gantry cranes offer advantages such as a larger luffing radius and a higher hook limit. However, their disadvantages are also significant: the hook's vertical position changes with the boom's amplitude, and the entire boom is involved in the luffing process, resulting in poor stability and difficulty in stopping the crane during lifting. Luffing is typically achieved through a drum-type winch mechanism that winds the wire rope. Because lifting heavy booms requires high-powered motors, the luffing speed cannot be too fast, otherwise instability will occur. Since luffing is also controlled by the wire rope, a breakage of the wire rope can lead to serious accidents. The four-link gantry crane has relatively obvious advantages and disadvantages. Its advantages include: the hook position remains essentially unchanged during luffing, resulting in smoother luffing compared to boom-tilt gantry cranes. It typically relies on hydraulic push-pull rods, screw mechanisms, or rack and pinion mechanisms for luffing, offering significantly better safety and reliability compared to boom-tilt gantry cranes. However, its disadvantages are also apparent. Because its luffing mechanism uses rack and pinion or hydraulic push rods, the luffing stroke is much shorter than that of a wire rope type, resulting in a slower luffing speed. Summary of the Invention

[0004] The purpose of this invention is to provide a flat-top gantry crane to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a flat-top gantry crane, comprising a tower body, a gantry frame installed at the lower end of the tower body, a slewing support installed at the upper end of the tower body, a machine platform installed at the upper end of the slewing support, a machine room installed at the upper end of the machine platform, a boom installed at the front end of the machine platform, a luffing device installed inside the boom, a second luffing wire rope and a first luffing wire rope respectively installed on the left and right sides of the luffing device, a luffing trolley installed at one end of the second luffing wire rope, the luffing trolley being slidably connected to the lower end of the boom, one end of the first luffing wire rope being connected to the luffing trolley, a hook installed at the lower end of the luffing trolley via a hoisting wire rope, an anti-shaft breakage protection device installed inside the luffing trolley, the anti-shaft breakage protection device being connected to the luffing trolley, and two anti-rope breakage protection devices symmetrically installed inside the luffing trolley, the two anti-rope breakage protection devices being respectively connected to the first luffing wire rope and the second luffing wire rope.

[0006] Preferably, the gantry includes a gantry seat and a bottom running structure. A cable winding device is installed inside the gantry, and a windproof anchoring device is installed at the lower end of the bottom running structure. An anti-tipping protection device is installed inside the windproof anchoring device.

[0007] Preferably, a counterweight is installed at the rear end of the machine platform, a lifting mechanism is installed in the middle of the machine platform, an electrical room is installed on the right side of the machine platform, a driver's cab connected to the machine platform is installed on the side of the boom, an electrical system is installed inside the electrical room, a central conductive ring is installed at the front end of the lifting mechanism, and slewing mechanisms are installed on both the left and right sides of the central conductive ring.

[0008] Preferably, the lifting mechanism includes a motor, a reducer, and a drum. The motor is mounted on the drum via the reducer. A lifting wire rope is wound around the surface of the drum. The lifting wire rope is connected to a hook. A height limiter is installed at the end of the drum.

[0009] Preferably, the boom has two guide wheels mounted on its surface, the luffing trolley has a first pulley block installed inside, the hook has a second pulley block at its upper end, one end of the hoisting wire rope is connected to the drum, and the other end of the hoisting wire rope is sequentially wound around the two guide wheels, the first pulley block, and the second pulley block and connected to the hook. Preferably, the drum includes a drum body, rope grooves, baffles, and safety rings. Multiple rope grooves are provided on the surface of the drum body. The size of the hoisting wire rope is adapted to the size of the rope grooves. A baffle is rotatably connected to the left side of the drum body. Three safety rings are provided on the left side of the drum body.

[0010] Preferably, the counterweight includes a first counterweight block, a second counterweight block, a third counterweight block, a fourth counterweight block, a first positioning stake, and a second positioning stake.

[0011] Preferably, the bottom running structure includes a balance beam and a trolley assembly. The balance beam is installed at the lower end of the gate seat, and multiple trolley assemblies are installed at the lower end of the balance beam. The trolley assembly includes a drive unit and wheels, and the wheels are used in conjunction with the drive unit.

[0012] Preferably, the upper end of the machine is equipped with a lightning rod, an anemometer, and an obstacle light device.

[0013] Preferably, a support platform is provided on the upper side wall of the tower body, the support platform is connected to the machine platform via a ladder, a climbing ladder is provided at the lower end of the support platform, the lower end of the climbing ladder is connected to the gantry, and the climbing body is fixedly connected to the side wall of the tower body.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. This flat-top gantry crane uses a luffing device that drives the luffing trolley to slide along the lower end of the boom via the second and first luffing wire ropes on both sides. This, combined with the lifting guide pulleys inside the boom, achieves high-precision luffing of the hook. The lifting mechanism incorporates a motor, reducer, drum, and height limiter, arranged in layers to avoid wire rope interference. Furthermore, the luffing wire rope uses a wound connection method, which significantly reduces resistance compared to the boom's tilting method. This also reduces the motor power required for the luffing mechanism, allowing for a much higher luffing speed and significantly improved work efficiency. Even if the luffing traction rope breaks, it will not cause a serious safety accident. The luffing trolley is equipped with a rope breakage protection device. If the traction rope breaks, this device will lock the lower chord of the boom, preventing the trolley from sliding under load during lifting. Additionally, the trolley is equipped with a ratchet rope locking device. It facilitates the locking of the luffing rope during installation, ensuring that the luffing rope does not sag excessively.

[0015] 2. This flat-top gantry crane features a counterweight at the rear of the machine platform consisting of multiple counterweight blocks and positioning stakes. The counterweight distribution can be flexibly adjusted according to the actual lifting capacity. The standard counterweight is 60t. The modular structure facilitates transportation and replacement, reducing installation site limitations. The positioning stakes ensure the stability of the counterweight, effectively balancing the overturning moment during heavy lifting operations and improving operational safety.

[0016] 3. This flat-top gantry crane features a gantry frame at the lower end of the tower, which connects to a cable reel and wind-resistant anchoring device, providing stable support for the entire machine. The upper end connects to the integrated counterweight, hoisting mechanism, electrical room, and operator's cab via a slewing support, forming the core functional area. The boom incorporates layered second and first luffing wire ropes and hoisting wire ropes, which slide together with the luffing trolley to ensure precise luffing and hoisting movements. The bottom of the gantry frame is equipped with wind-resistant anchors and wheel clamps to adapt to complex working conditions and enhance anti-overturning capabilities. The collaborative design of multiple modules lowers the overall center of gravity, and combined with frequency conversion speed regulation and torque protection, operation is more stable and efficient. Furthermore, the modular installation and disassembly of the multiple modules makes on-site installation and transportation more convenient and faster. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the gantry structure of the present invention; Figure 3 This is a schematic diagram of the cable winding device of the present invention; Figure 4 This is a schematic diagram of the lifting mechanism structure of the present invention; Figure 5 This is a graph showing the lifting characteristics of the present invention. Figure 6 This is a diagram of the hoisting wire rope winding of the present invention; Figure 7 This is a schematic diagram of the traction wire rope winding system of the present invention; Figure 8 This is a schematic diagram of the relevant structure on the upper part of the machine platform of the present invention; Figure 9 This is a schematic diagram of the counterweight structure of the present invention; Figure 10 This is a schematic diagram of the roll structure of the present invention; Figure 11 This is a schematic diagram of the internal structure of the variable amplitude trolley of the present invention; Figure 12 This is a schematic diagram of the windproof anchoring device of the present invention.

[0018] In the diagram: 1. Tower body; 2. Cable winding device; 3. Windproof anchoring device; 4. Machine platform; 5. Slewing bearing; 6. Machine room; 7. Lightning rod, anemometer, and obstruction light device; 8. Luffing device; 9. First luffing wire rope; 10. Second luffing wire rope; 11. Hoisting wire rope; 12. Boom; 13. Hook; 14. Gantry; 1401. Gantry seat; 1402. Bottom running structure; 15. Support platform; 16. Climbing ladder; 17. Luffing trolley; 18. Hoisting mechanism; 1801. Motor; 1802. Reducer; 1803. Drum; 18031. Drum body; 18032, Rope Groove; 18033, Baffle; 18034, Safety Ring; 19, Electrical Room; 20, Driver's Cab; 21, Slewing Mechanism; 22, Central Conductive Ring; 23, Electrical System; 24, Counterweight; 2401, First Counterweight; 2402, Second Counterweight; 2403, Third Counterweight; 2404, Fourth Counterweight; 2405, First Positioning Pile; 2406, Second Positioning Pile; 25, Guide Wheel; 26, First Pulley Block; 27, Second Pulley Block; 28, Anti-Shaft Breakage Protection Device; 29, Anti-Rope Breakage Protection Device; 30, Anti-Overturning Protection Device. Detailed Implementation

[0019] 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.

[0020] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," 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 this 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 this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] like Figures 1 to 9As shown, this embodiment of the flat-top gantry crane includes a tower body 1, which is a cylindrical structure composed of two cylindrical structures at both ends, with an outer diameter of φ3370mm. Longitudinal and transverse stiffeners are added inside the cylinder to improve local stability. Both ends are connected to the machine base 4 via flange plates, with a preload of 265kN and a wrench torque of 1900N·m. A gantry frame 14 is installed at the lower end of the tower body 1, and the gantry frame 14 is connected as a whole by bolts with hinged holes to form a rigid support. A slewing support 5 is installed at the upper end of the tower body 1, and a slewing support 5 is installed at the upper end of the slewing support 5. The machine platform 4 has a machine room 6 installed at its upper end. A boom 12 is installed at the front end of the machine platform 4. The boom 12 is a spatial truss structure with four corners gradually transitioning to a triangle, divided into six sections. The sections are connected by pins, shear pins, and bolts. It uses Q355B load-bearing steel and 40Cr pins. Internally, it is equipped with lifting guide pulleys and luffing guide pulley blocks. A luffing device 8 is installed inside the boom 12. A second luffing wire rope 10 and a first luffing wire rope 9 are installed on the left and right sides of the luffing device 8, respectively. One end of the luffing wire rope 10 is equipped with a luffing trolley 17, which is slidably connected to the lower end of the boom 12. One end of the first luffing wire rope 9 is connected to the luffing trolley 17. The lower end of the luffing trolley 17 is equipped with a hook 13 via a hoisting wire rope 11. The luffing trolley 17 is connected to the hook 13 via the hoisting wire rope 11. The material is 24NAT35(W)×K7+IWR1870SZ non-twisting wire rope, and the drum 1803 has rope grooves on its surface to ensure the synchronization of luffing and hoisting actions. The luffing trolley 17 is equipped with an anti-axle breakage protection device 28, which is connected to the luffing trolley 17. Two anti-rope breakage protection devices 29 are symmetrically installed inside the luffing trolley 17. The two anti-rope breakage protection devices 29 are respectively connected to the first luffing wire rope 9 and the second luffing wire rope 10. The anti-axle breakage protection device 28 can prevent the wheel axle of the luffing trolley 17 from breaking, and the two anti-rope breakage protection devices 29 can prevent the first luffing wire rope 9 and the second luffing wire rope 10 from breaking.

[0022] Specifically, the gantry 14 includes a gantry seat 1401 and a bottom running structure 1402. A cable winding device 2 is installed inside the gantry 14. A windproof anchoring device 3 is installed at the lower end of the bottom running structure 1402. An anti-tipping protection device 30 is installed inside the windproof anchoring device 3. The anti-tipping protection device 30 typically activates when the machine is stopped. Its specific principle is as follows: When the drum 1803 of the luffing device 8 has an encoder at its end that accurately monitors the actual position of the luffing trolley 17 on the boom, the lifting wire rope 11 passes over the... Sensors for monitoring weight are installed on pulley block 26 and pulley block 27. The lifting weight and the real-time position of the luffing trolley 17 are combined, and finally, the lifting torque value is limited through electrical program to achieve torque protection function. The gantry 1401 is a cross-shaped box structure, in which the box-shaped gantry legs are welded to the tower column I section of the tower body 1 and connected by bolts through hinge holes. The modular design effectively reduces the assembly difficulty. The bottom running structure 1402 includes a balance beam, which is hinged to the trolley group to balance the wheel load. The trolley group contains a drive mechanism. The drive unit, consisting of a MH100M-4-TH motor and a K308TH / G-140.6 three-in-one reducer, ensures smooth operation and start-stop stability. The cable reel device 2 is an externally purchased component, supplying AC380V power to the power cabinet in the machine room 6 via a cable. External power is supplied via a cable to the machine room through the brushes and slip rings of the cable reel, supporting power supply for crane movement. The windproof anchoring device 3 includes a wheel clamp and wind speed linkage function; the wheel clamp is equipped with a limit switch. The switch ensures that the operating mechanism cannot start when the wheel clamp is not open; an alarm stops the machine when the wind speed is ≥20m / s; it is connected to the bottom of the gantry 14 via a flange to improve safety in high wind conditions; the lifting capacity and lifting torque of the lifting curve section are directly controlled by the electrical program, greatly improving the safety and accuracy of monitoring; in addition, the tower crane also realizes variable torque monitoring of the curve section; through the anti-overturning protection device 30 and the monitoring program, it not only has the ability to resist slippage, but also the ability to resist overturning of the whole machine, compared with the commonly used anchoring device.

[0023] Furthermore, a counterweight 24 is installed at the rear end of the machine base 4, a lifting mechanism 18 is installed in the middle of the machine base 4, an electrical room 19 is installed on the right side of the machine base 4, and a driver's cab 20 connected to the machine base 4 is installed on the side of the boom 12. The electrical system 23 is installed inside the electrical room 19. A central conductive ring 22 is installed at the front end of the lifting mechanism 18, and slewing mechanisms 21 are installed on both the left and right sides of the central conductive ring 22. The main body of the machine base 4 is transported in three parts, consisting of two 1400mm high welded I-beams. The main beam is welded together with the boom 12 at the same width as the main beam, and consists of 8 crossbeams. The front end of the main beam has a boom 12 hinge seat welded to it, the rear end has a tie rod support welded to it, and the center of rotation has a φ3000mm cylinder welded to it. The counterweight 24 has a total weight of 60t and consists of multiple counterweight blocks and multiple positioning piles. The positioning piles prevent displacement and balance the overturning moment during heavy lifting operations (30t / 5t). It is important to note that the moment limiter restricts the overturning moment to not exceed the allowable value on the lifting characteristic curve. The hoisting mechanism 18 includes YZP... A 315M2-8C-TH motor, connected to a QJS-D560-40-Ⅷ-C reducer via a WGP5 coupling, drives drum 1803 to wind up the lifting wire rope 11. A DXZ-1:210-4W height limiter is installed at the end of drum 1803 to limit the maximum lifting height of hook 13 (36m above rail / 17m below rail) and the minimum hook depth. The electrical room 19 houses the electrical system 23, employing a touchscreen, PLC, and frequency converter speed control scheme, and integrating a torque limiter. When 90% load is applied... Alarm, 105% power cut-off, encoder to detect amplitude and comprehensive protection functions (overcurrent, undervoltage, wind protection, etc.), the central conductive ring 22 is the slewing conductive device of the upper platform inside the tower body 1, connected to the machine 4 and the tower column III section of the tower body 1 by 60 M36 high-strength bolts, with built-in brushes and slip rings to ensure continuous power supply when the machine 4 is fully slewing, the operator's cab 20 is located on the side of the boom 12, with angle steel and steel plate frame, equipped with aluminum alloy doors and windows, air conditioning and heating and cooling and the master control console.

[0024] Furthermore, the hoisting mechanism 18 includes a motor 1801, a reducer 1802, and a drum 1803. The drum 1803 is mounted on the motor 1801 via the reducer 1802. A hoisting wire rope 11 is wound around the surface of the drum 1803 and is connected to the hook 13. A height limiter is installed at the end of the drum 1803. The motor 1801 is a YZP type. The 315M2-8C-TH variable frequency motor supports variable frequency speed regulation, with low speed under heavy load and high speed under no-load, and a speed regulation range of 1:10. It has multiple protection functions, including self-diagnosis and display alarm functions for various faults, including but not limited to instantaneous overcurrent, power failure and voltage loss, grounding protection, and overfrequency protection. The reducer 1802 is a QJS-D560-40-Ⅷ-C type reducer, which matches the output torque of the motor 1801 to ensure transmission efficiency. The drum 1803 is a φ3000mm cylinder with rope grooves on the surface. The wire rope is wound in a single layer, and the rope end is fixed to one end of the drum 1803 by a pressure plate. The drum 1803 can be used to wind up or unwind the wire rope. The height limiter is a DXZ-1:210-4W type, which limits the lifting height by detecting the number of rotations of the drum 1803 to prevent the hook 13 from colliding with the boom 12 or the ground due to overtravel.

[0025] Furthermore, two guide wheels 25 are mounted on the surface of the boom 12, a first pulley block 26 is installed inside the luffing trolley 17, a second pulley block 27 is provided at the upper end of the hook 13, one end of the hoisting wire rope 11 is connected to the drum 1803, and the other end of the hoisting wire rope 11 is sequentially wound around the two guide wheels 25, the first pulley block 26 and the second pulley block 27 and connected to the hook 13. The two guide wheels 25 can guide the hoisting wire rope 11. At the same time, a pin-type sensor is installed inside the first guide wheel 25 to detect the lifting capacity. The first pulley block 26 inside the hook 17 contains four fixed pulleys, and the second pulley block 27 at the upper end of the hook 13 contains three fixed pulleys. The lifting wire rope 11 first winds around one fixed pulley inside the first pulley block 26, then extends into the second pulley block 27 and winds around one fixed pulley, then returns to the first pulley block 26 and winds around the two lower fixed pulleys, then continues downwards and winds around the two right-side fixed pulleys inside the second pulley block 27, and finally winds upwards around the last fixed pulley inside the first pulley block 26. The end then connects to the tail end of the boom 12. The specific winding structure diagram is shown below. Figure 6 As shown.

[0026] Furthermore, the drum 1803 includes a drum body 18031, rope grooves 18032, a baffle 18033, and safety rings 18034. Multiple rope grooves 18032 are provided on the surface of the drum body 18031. The size of the hoisting wire rope 11 is adapted to the size of the rope grooves 18032. The baffle 18033 is rotatably connected to the left side of the surface of the drum body 18031. Three safety rings 18034 are provided on the left side of the drum body of the baffle 18033. By manually rotating the baffle 18033, the number of rope grooves 18032 and safety rings 18034 on the left side of the surface of the drum body 18031 can be changed. By changing the number of safety rings 18034, the length of the retractable hoisting wire rope 11 can be increased.

[0027] Furthermore, the counterweight 24 includes a first counterweight block 2401, a second counterweight block 2402, a third counterweight block 2403, a fourth counterweight block 2404, a first positioning pile 2405, and a second positioning pile 2406. The multiple counterweight blocks are precast concrete blocks, with the weight of each block distributed according to the total weight of 60t. Lifting lugs are provided on the surface for convenient and quick installation, facilitating transportation and installation. They are connected as a whole through steel pipe joints to ensure the connection strength with the machine platform 4. The first positioning pile 2405 and the second positioning pile 2406 are steel pipe structures, evenly arranged along the edge of the counterweight blocks, and fixed to the rear end of the machine platform 4 by welding or bolts to prevent the concrete blocks from shifting due to vibration or wind force, ensuring that the center of gravity of the counterweight 24 is aligned with the rotation center of the machine platform 4, and improving the anti-overturning stability.

[0028] Furthermore, the bottom running structure 1402 includes a balance beam and trolley assemblies. A balance beam is installed at the lower end of the gantry 1401, and multiple trolley assemblies are installed at the lower end of the balance beam. The trolley assemblies include a drive unit and wheels. The wheels work in conjunction with the drive unit. The balance beam is a box-shaped structure with a cross beam and channel steel welded together to form a cross section. It is hinged to the trolley assemblies through a connecting seat to balance the load of the four trolley assemblies at the bottom of the gantry 1401. Each trolley assembly bears about 1 / 4 of the total weight, preventing wheel wear or deformation of the gantry 14 due to excessive load on one side. There are a total of four trolley assemblies. Each assembly includes a drive unit (MH100M-4-TH motor), a reducer (K308TH / G-140.6 three-in-one reducer), and wheels. The wheels adopt a double-flanged structure with a large contact area with the rail, ensuring operational stability. The drive unit and reducer are integrated on the trolley frame and connected to the balance beam through a flange, ensuring a rigid connection of the transmission system and reducing operational vibration.

[0029] Furthermore, a lightning rod, anemometer, and obstruction light device 7 is installed on the upper part of the machine platform 4. The lightning rod is a galvanized steel pipe with a height of ≥5m, which needs to extend beyond the highest point of the machine platform 4. It is connected to the steel structure and track of the machine platform 4 via a grounding down conductor made of φ12 round steel. The grounding resistance is ≤4Ω to ensure the safety of the equipment in thunderstorms. The anemometer is a BR type, installed on the upper part of the machine platform 4, close to the base of the boom 12, with a range of 0-60m / s. When the wind speed reaches 20m / s, it automatically issues an alarm and outputs a 4-20mA signal to the torque limiter of the electrical system 23 to provide real-time feedback of wind speed data. The obstruction light is a red strobe light, installed on the top of the lightning rod, with a power of ≥30W and a flashing frequency of 20-30 times / minute. It is turned on at night or during low visibility operations to improve the visibility of the crane's aerial operations and prevent aerial collisions.

[0030] Furthermore, a support platform 15 is provided on the upper side wall of the tower body 1. The support platform 15 is connected to the machine platform 4 via a ladder. A climbing ladder 16 is provided at the lower end of the support platform 15, and the lower end of the climbing ladder 16 is connected to the gantry 14. The climbing body is fixedly connected to the side wall of the tower body 1. The support platform 15 is a steel grating platform with dimensions ≥2m×2m to meet the standing requirements of maintenance personnel. Protective railings are provided at the edges and welded and fixed to the side wall of the tower body 1, serving as the intermediate route from the machine platform 4 to the top of the tower. The maintenance platform includes a steel ladder 16 with an inclination angle of ≤45° and a step spacing of ≤300mm. The surface is equipped with anti-slip strips. The lower end is connected to the top of the gantry 14 via a flange, and the upper end transitions to the support platform 15 via a rest platform, forming a continuous maintenance passage of "gantry 14 → ladder 16 → support platform 15 → machine 4". The ladder 16 is fixed to the side wall of the tower body 1 by L-shaped angle steel and bolts. A rest platform is set every 2m to ensure the safety of maintenance personnel going up and down.

[0031] The usage method of this embodiment is as follows: Check that the brakes of the hoisting, luffing, and slewing mechanisms 21 are in normal condition; confirm that the luffing wire rope and hoisting wire rope 11 have no broken wires or looseness; observe that the real-time wind speed on the anemometer is ≤20m / s; check whether the wheel clamps are loose; connect the AC380V power supply to the machine room 6 through the cable reel 1803 device; check that the brush of the central conductive ring 22 is in good contact with the slip ring to ensure the power supply for the slewing of the machine platform 4; operate the right operating handle to select the travel gear; the slewing mechanism 21 drives the machine platform 4 to adjust its direction; and the trolley group drives the wheels to move at a constant speed along the track. Operating the right control handle selects the travel gear, the slewing mechanism 21 drives the machine platform 4 to adjust its direction, and the trolley group drives the wheels to move at a constant speed along the track; operating the left control handle selects the slewing gear, the frequency conversion motor 1801 drives the pinion to mesh with the external gear ring of the three-row roller bearing, driving the machine platform 4 to rotate; the left handle controls the luffing speed, the luffing trolley 17 slides along the boom 12, the second luffing wire rope 10 and the first luffing wire rope 9 are wound and unwound synchronously, realizing the horizontal movement of the hook 13; the right handle controls the hoisting speed, the drum 1803 winds up the hoisting wire rope 11 to lift the heavy object.

[0032] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. 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 flat-top gantry crane, comprising a tower body (1), characterized in that, A gantry (14) is installed at the lower end of the tower body (1), a slewing support (5) is installed at the upper end of the tower body (1), a machine platform (4) is installed at the upper end of the slewing support (5), a machine room (6) is installed at the upper end of the machine platform (4), a boom (12) is installed at the front end of the machine platform (4), a luffing device (8) is installed inside the boom (12), a second luffing wire rope (10) and a first luffing wire rope (9) are installed on the left and right sides of the luffing device (8) respectively, a luffing trolley (17) is installed at one end of the second luffing wire rope (10), and the luffing trolley (17) slides... The first luffing wire rope (9) is connected to the lower end of the boom (12). One end of the first luffing wire rope (9) is connected to the luffing trolley (17). The lower end of the luffing trolley (17) is equipped with a hook (13) via a hoisting wire rope (11). The luffing trolley (17) is equipped with an anti-shaft breakage protection device (28). The anti-shaft breakage protection device (28) is connected to the luffing trolley (17). The luffing trolley (17) is equipped with two anti-rope breakage protection devices (29) symmetrically installed inside. The two anti-rope breakage protection devices (29) are respectively connected to the first luffing wire rope (9) and the second luffing wire rope (10).

2. The flat-top gantry crane according to claim 1, characterized in that: The gantry (14) includes a gantry seat (1401) and a bottom running structure (1402). A cable winding device (2) is installed inside the gantry (14). A windproof anchoring device (3) is installed at the lower end of the bottom running structure. An anti-overturning protection device (30) is installed inside the windproof anchoring device (3).

3. The flat-top gantry crane according to claim 1, characterized in that: The machine platform (4) is equipped with a counterweight (24) at the rear end. The machine platform (4) is equipped with a hoisting mechanism (18) in the middle. The machine platform (4) is equipped with an electrical room (19) on the right side. The boom (12) is equipped with a driver's cab (20) connected to the machine platform (4) on the side. The electrical room (19) is equipped with an electrical system (23). The hoisting mechanism (18) is equipped with a central conductive ring (22) at the front end. The central conductive ring (22) is equipped with a slewing mechanism (21) on both the left and right sides.

4. The flat-top gantry crane according to claim 3, characterized in that: The lifting mechanism (18) includes a motor (1801), a reducer (1802) and a drum (1803). The motor (1801) is connected to the drum (1803) via the reducer (1802). A lifting wire rope (11) is wound around the surface of the drum (1803). The lifting wire rope (11) is connected to the hook (13). A height limiter is installed at the end of the drum (1803).

5. The flat-top gantry crane according to claim 4, characterized in that: Two guide wheels (25) are installed on the surface of the boom (12), a first pulley block (26) is installed inside the luffing trolley (17), a second pulley block (27) is provided at the upper end of the hook (13), one end of the lifting wire rope (11) is connected to the drum (1803), and the other end of the lifting wire rope (11) is wound around the two guide wheels (25), the first pulley block (26) and the second pulley block (27) in sequence and connected to the hook (13).

6. The flat-top gantry crane according to claim 5, characterized in that: The drum (1803) includes a drum body (18031), rope grooves (18032), baffles (18033) and safety rings (18034). Multiple rope grooves (18032) are provided on the surface of the drum body (18031). The size of the hoisting wire rope (11) is adapted to the size of the rope grooves (18032). A baffle (18033) is rotatably connected to the left side of the surface of the drum body (18031). Three safety rings (18034) are provided on the left side of the drum body of the baffle (18033).

7. The flat-top gantry crane according to claim 6, characterized in that: The counterweight (24) includes a first counterweight (2401), a second counterweight (2402), a third counterweight (2403), a fourth counterweight (2404), a first positioning stake (2405), and a second positioning stake (2406). The first counterweight (2401), the second counterweight (2402), the third counterweight (2403), and the fourth counterweight (2404) are all located on the surface of the machine base (4), and the first positioning stake (2405) and the second positioning stake (2406) are embedded inside the machine base.

8. The flat-top gantry crane according to claim 2, characterized in that: The bottom running structure includes a balance beam and a trolley assembly. The balance beam is installed at the lower end of the gantry, and multiple trolley assemblies are installed at the lower end of the balance beam. The trolley assembly includes a drive unit and wheels, and the wheels are used in conjunction with the drive unit.

9. The flat-top gantry crane according to claim 1, characterized in that: The upper end of the machine (4) is equipped with a lightning rod anemometer obstruction light device (7).

10. The flat-top gantry crane according to claim 1, characterized in that: The upper side wall of the tower body (1) is provided with a support platform (15), which is connected to the machine platform (4) via a ladder. The lower end of the support platform (15) is provided with a climbing ladder (16), which is connected to the gantry (14) at the lower end. The climbing body is fixedly connected to the side wall of the tower body (1).

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