A lifting and restraining portal lifting equipment

Abstract

The present invention discloses a lifting-constrained portal crane, primarily relating to the field of portal cranes. The crane comprises a gantry, a cylindrical body, a rotating platform, a boom, and a spreader. The spreader has a rectangular frame structure. The spreader also includes a follower module and a constraint module. The constraint module is mounted at the bottom of the rotating platform and includes four motor-driven drums. The follower module is fixed to the spreader and connected to the drums via cables for pulling. The present invention has the beneficial effects of preventing the spreader from twisting and swinging, thereby assisting in rapid positioning of the spreader, preventing collisions with containers, and facilitating smooth lifting and landing.

Description

Technical Field

[0001] The invention relates to the field of portal cranes, in particular to a lifting and restraining portal crane. Background Art

[0002] Gantry cranes are a common type of lifting machinery, typically used for loading and unloading cargo in ports, docks, warehouses, and other locations. These cranes have a large lifting capacity and a wide operating range. In addition to various bulk cargoes, lifting containers is a common operation for gantry cranes.

[0003] When loading and unloading containers, they must be positioned during both the lifting and lowering stages. During lifting, the corner clips must be aligned to hook the container, and when loading it into a vehicle or ship's hold, the containers must be aligned. Existing lifting operations, due to the long-distance suspension of the spreader using steel wire ropes, cannot solve the problems of spreader twisting and swinging, resulting in long and inaccurate alignment. Furthermore, during loading, the lifted container swings and repeatedly bumps into other containers. Summary of the Invention

[0004] The object of the present invention is to provide a lifting restraint type portal crane, which prevents the torsional swing of the spreader, thereby assisting the spreader in rapid positioning, preventing collision of containers, and assisting in smooth lifting and lowering.

[0005] To achieve the above-mentioned purpose, the present invention is implemented through the following technical solutions:

[0006] A lifting and restraining portal crane comprises a portal frame, a cylinder, a rotating platform, a lifting arm, and a sling, wherein the sling has a rectangular frame structure; and further comprises a follower module and a restraining module:

[0007] The constraint module is installed at the bottom of the rotating platform and includes two horizontally extending arms arranged side by side. An outer reel and an inner reel are installed on both sides of the arms respectively, the outer reel is arranged at the end of the arm away from the vertical plate, and the inner reel is arranged in the middle of the arm.

[0008] The cam is secured to a first position, with the first wheel having a first end and a second end, secured to a first position relative to the first gear, and having a first end connected to the second wheel having a first end and a second end connected to the first gear.

[0009] The first angle bracket and the second angle bracket both include an L-shaped right-angle bracket, and the inner corners of the right-angle brackets of the first angle bracket and the second angle bracket are arranged relative to each other, one end of the right-angle bracket is provided with a right-angle end and the other end is provided with a straight plate end, the straight plate end is provided with a socket movably connected thereto, the fixing ring is provided on the socket, and the end of the socket close to the sling is provided with a fixing plate fixedly connected thereto, the fixing plate and the fixing ring are arranged in the opposite direction, the fixing plate and the socket are vertically fixed to form an L-shape, a first fixing bolt passes through the fixing plate, and a plurality of second fixing bolts are equidistantly provided in the middle of the right-angle bracket.

[0010] A fixing sleeve is vertically passed through the middle of the insert sleeve, a fixing shaft connected to the fixing sleeve for rotation is passed through the fixing sleeve, the outer end of the fixing shaft is fixedly connected to the fixing ring and is formed as one piece, a clearance bar hole is provided in the center of the straight plate end, the fixing sleeve passes through the clearance bar hole and the two are clearance-matched.

[0011] The length direction of the first outer bracket and the second outer bracket is consistent with the width direction of the spreader;

[0012] A first side bracket is provided on the outer side of the first angle bracket away from the second angle bracket, and the first side bracket is arranged close to the first outer bracket. The extension direction of the first side bracket corresponds to the length direction of the spreader. The outer end of the first side bracket is rotatably connected to the first swing shaft. The outer end of the first swing shaft away from the first angle bracket is equipped with a first guide wheel, and the height of the first guide wheel corresponds to the height of the second hanging ring.

[0013] A second side bracket is provided on the outer side of the second angle bracket away from the first angle bracket. The second side bracket is provided close to the second outer bracket. The extension direction of the second side bracket corresponds to the length direction of the spreader. The outer end of the second side bracket is rotatably connected to the second swing shaft. The outer end of the second swing shaft is installed with a second guide wheel. The height of the second guide wheel corresponds to the height of the first hanging ring.

[0014] U-shaped blocking bars are provided on the outer sides of the first guide wheel and the second guide wheel.

[0015] The support arm includes a fixed arm and an adjusting arm, the inner end of the fixed arm is vertically fixed on the vertical plate, the inner reel is installed on the outer end of the fixed arm, the bottom side of the fixed arm is provided with a strip frame fixedly connected to it, the outer reel is installed on the adjusting arm, and the bottom side of the adjusting arm is fixed with a mounting bracket corresponding to the position of the strip frame, the mounting bracket partially overlaps with the strip frame and a third fixing bolt is fixed through the overlapping part.

[0016] The vertical plate is installed at the bottom of the rotating platform through a lifting mechanism. The lifting mechanism includes a hanging frame, on which a vertically extending box plate is fixedly installed. A first range-extending frame adapted to its height is installed in front of the box plate in a liftable manner. A second range-extending frame adapted to its height is installed in front of the first range-extending frame in a liftable manner. The vertical plate is installed in front of the second range-extending frame in a liftable manner. The height of the box plate does not exceed the height of the cylinder.

[0017] A mounting platform is fixed to the bottom side of the box plate, and two left-right symmetrical polished rod guide rails are installed on the side of the first range-extending frame close to the box plate. The polished rod guide rails are equipped with a one-way slider. A lifting screw rotatably mounted on the first range-extending frame is provided between the two polished rods, and a nut is equipped on the lifting screw. The nut and the one-way slider are both fixed to the mounting platform;

[0018] and / or

[0019] A vertically extending second-range slide rail is symmetrically installed on the left and right sides of the first range-extending frame on a side away from the box plate, a second-range slider is slidably engaged on the second-range slide rail, a second-range rack mounted on the first range-extending frame is provided between the two second-range slide rails, a second-range motor is installed on the top of the second range-extending frame, a second-range gear meshing with the second-range rack is provided on the output shaft of the second-range motor, and two second-range sliders are also fixed on the top of the second range-extending frame;

[0020] and / or

[0021] The second range-extending frame is symmetrically installed with a vertically extending three-range slide rail on the front side away from the first range-extending frame, and the three-range slide rail is equipped with a three-range slider. A three-range rack installed on the second range-extending frame is provided between the two three-range slide rails. A three-range motor is installed on the top side of the vertical plate, and a three-range gear meshing with the three-range rack is installed on the output shaft of the three-range motor. Two three-range sliders are also fixed on the top of the vertical plate.

[0022] When the spreader is lower than the top of the box plate and gradually falls, the vertical plate, the first range-extending frame, and the second range-extending frame start to descend in sequence. When the support arm is at the same height as the spreader, the lifting mechanism is stopped.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] During the lifting and boom length adjustment of the lifting, when the position and height of the spreader change, the inner drum and the outer drum are retracted and retracted by rotating, so that the released lengths of the first outer cable, the second outer cable and the inner cable remain horizontal to the spreader. By independently pulling the two inner and outer corner ends on the left or right side of the spreader, the spreader can be effectively prevented from swinging on the horizontal plane, thereby preventing the spreader from twisting left and right on the horizontal plane, greatly reducing the collision of containers, and can quickly assist in positioning the spreader and the container. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the follower module and the constraint module of the present invention.

[0026] Figure 2 It is a schematic diagram of the outer side of the spreader and follower module of the present invention.

[0027] Figure 3 It is a schematic diagram of the inner side of the sling and follower module of the present invention.

[0028] Figure 4 Schematic diagram of the follower module of the present invention.

[0029] Figure 5 It is a constraint diagram of the present invention.

[0030] Figure 6 It is a schematic diagram of the coordination of the follower module, the constraint module and the lifting mechanism of the present invention.

[0031] Figure 7 It is a back side schematic diagram of the lifting mechanism of the present invention (with the box plate removed).

[0032] Figure 8 It is a bottom view of the lifting mechanism of the present invention.

[0033] Reference numerals shown in the accompanying drawings:

[0034] 1. Lifting device; 2. First angle bracket; 3. Second angle bracket; 4. Right-angle end; 5. Straight plate end; 6. Insert sleeve; 7. Fixing plate; 8. First fixing bolt; 9. Fixing ring; 10. Fixing sleeve; 12. Clearance bar hole; 13. First outer bracket; 14. First hanging ring; 15. First pulley; 16. Second outer bracket; 17. Second pulley; 18. Second hanging ring; 19. First side bracket; 20. First swing shaft; 21. First guide wheel; 22. Second side bracket; 23. Second swing shaft; 24. Second guide wheel; 25. U-shaped stop 1. The first extension frame; 2. The second extension frame; 3. The third extension frame; 4. The third extension frame; 5. The third extension frame; 6. The third extension frame; 7. The fourth extension frame; 8. The fourth extension frame; 9. The fourth extension frame; 10. The fourth extension frame; 11. The fourth extension frame; 12. The fourth extension frame; 13. The fourth extension frame; 14. The fourth extension frame; 15. The fourth extension frame; 16. The fourth extension frame; 17. The fourth extension frame; 18. The fourth extension frame; 19. The fourth extension frame; 20. The fourth extension frame; 21. The fourth extension frame; 22. The fourth extension frame; 23. The fourth extension frame; 24. The fourth extension frame; 25. The fourth extension frame; 26. The fourth extension frame; 27. The fourth extension frame; 28. The fourth extension frame; 29. ​​The fourth extension frame; 30. The fourth extension frame; 31. The fourth extension frame; 32. The fourth extension frame; 33. The fourth extension frame; 34. The fourth extension frame; 35. The fourth extension frame; 36. The fourth extension frame; 37. The first extension frame; 38. The second extension frame; 39. The fourth extension frame; 40. The second extension frame; 41. The second extension frame; 42. The second extension frame; 43. The second extension frame; 44. The third extension frame; 45. The third extension frame; 46. The third extension frame; 47. The first external cable; 48. The second external cable; 49. The internal cable. DETAILED DESCRIPTION

[0035] Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiments are only used to illustrate the present invention and are not used in limiting the scope of the present invention.In addition, should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the application equally.

[0036] The lifting equipment in this example mainly refers to equipment used in docks, ports and other areas for lifting containers. Its main structure is not limited to the portal crane of the existing technology. The main mechanical structure includes:

[0037] Gantry, traveling mechanism, cylinder, rotating mechanism, boom, sling 1, safety device, electrical control system, etc.

[0038] Gantry: As the basic part of the crane, it provides support at the bottom and is usually composed of a main beam, outriggers, cross beams, etc., forming a stable gate-shaped structure.

[0039] Traveling mechanism: The gantry crane can travel on tracks. Its traveling mechanism includes wheels, drive system (such as motor and reducer) and tracks, etc.

[0040] Cylinder: fixed on the top of the gantry and used to provide a support base for the rotating mechanism;

[0041] Rotating mechanism: rotatably mounted on the cylinder, including a rotating platform that can rotate on a horizontal plane, and structures such as a cab, a machine room, a herringbone frame, a rotating motor, a reducer, a rotating bearing, and a rotating gearbox mounted on the rotating platform;

[0042] Jib: The jib of a crane can be a box-shaped structure or a truss structure, with a wire rope installed. One end of the wire rope is used to connect to the spreader 1, and the other end is wound on a drum to achieve lifting control. The bottom end of the jib is rotatably installed on the rotating platform, and its swing angle is controlled by the luffing mechanism (which allows the crane's jib to change angles within a certain range to adapt to different operating requirements. It usually includes a luffing motor, a reducer, a luffing gearbox, and a luffing pulley, etc.), thereby controlling the approach or distance of the cargo.

[0043] Spreader 1: Hung at the lower end of the wire rope, it cooperates with the container to lift. In this example, Spreader 1 utilizes a rectangular frame. To coordinate with the container, existing automatic snap-on mechanisms can be used at the corners of Spreader 1 to automatically grab and lower the container. Alternatively, the container can be manually secured by hooking it to the corners of the container using lifting chains and hooks. When secured, the length of Spreader 1's frame aligns with the length of the container, and Spreader 1 is centered above the container.

[0044] Electrical control system: responsible for controlling various actions of the crane, such as traveling, lifting, luffing and rotation. The electrical control system includes a control cabinet, operating table, cables and various sensors.

[0045] Safety devices: In order to ensure operation safety, portal cranes are equipped with a variety of safety devices, such as limit switches, overload limiters, emergency stop buttons, wind protection devices, etc.

[0046] The lifting restraint mechanism mainly includes two parts, which are respectively used to be installed on the lifting device 1 and the rotating platform to restrain the swing of the lifting device 1.

[0047] The lifting constraint mechanism includes a follower module and a constraint module. The follower module is used to be fixed on the sling 1, and the constraint module is used to be fixed on the bottom of the rotating platform.

[0048] The follower module includes a first angle frame 2 and a second angle frame 3 that are arranged relatively to each other. The basic structures of the first angle frame 2 and the second angle frame 3 are the same, and both include an L-shaped right-angle frame. The right-angle frame inner corners of the first angle frame 2 and the second angle frame 3 are arranged relatively to each other. One end of the right-angle frame is provided with a right-angle end 4 and the other end is provided with a straight plate end 5. The right-angle end 4 has a right-angle inner corner, which is used to cooperate with the angle end of the sling frame away from the side of the boom to achieve fitting and positioning.

[0049] The straight plate end 5 is provided with a sleeve 6 that is movably connected to it. The sleeve 6 is provided with a fixing ring 9 on the outside of the sling 1. In order to adapt to pulling and facilitate the installation and replacement of vulnerable components, a fixing sleeve 10 is vertically fixed through the middle of the sleeve 6. A fixing shaft is inserted into the fixing sleeve 10 and is rotatably connected to it. The outer end of the fixing shaft is fixedly connected to the fixing ring 9 and is formed into an integral body. The inner end of the fixing shaft is provided with a stopper. The stopper and the fixing shaft can be fixed by bolts. Based on the above structure, the fixing ring 9 can adapt to the pulling direction and swing through the fixing shaft during pulling. At the same time, the structure of the fixing ring 9 facilitates the insertion and fixation of the wire rope. When the component is worn, the fixing ring 9 can be replaced in time, thereby facilitating installation and maintenance. A clearance bar hole 12 is provided in the center of the straight plate end 5. The fixing sleeve 10 passes through the clearance bar hole 12 and the two are clearance-matched. When the sleeve 6 is inserted into the straight plate end 5, the clearance bar hole 12 can leave space for the fixing sleeve 10.

[0050] The end of the sleeve 6 close to the sling 1 is provided with a fixing plate 7 fixedly connected thereto, and the fixing plate 7 is arranged in the opposite direction of the fixing ring 9. The fixing plate 7 and the sleeve 6 are vertically fixed to form an L shape. The fixing plate 7 is penetrated by a first fixing bolt 8, and the first fixing bolt 8 is used to fix the sleeve 6 to the sling 1, so as to achieve cooperation with the angle end of the sling 1 close to the boom side through the fixing plate 7 and the straight plate end 5.

[0051] Based on the above structure, after the right-angle end 4 is engaged with the corner end of the sling 1 (away from the boom), the sleeve 6 is inserted into the straight plate end 5. The insertion position of the sleeve 6 can be flexibly adjusted according to the width of the sling 1, so that the distance between the fixing plate 7 and the right-angle end 4 is adapted to the width of the sling 1. At this time, the fixing plate 7 is abutted against the side of the sling 1 close to the boom, and the right angle formed by the fixing plate 7 and the straight plate end 5 is engaged with the corner end of the sling 1 (close to the boom), thereby achieving the fixation of the follower module relative to the left / right corner ends of the sling 1. This structure is easy to disassemble and install, has a reliable fixing effect, and is tightly matched with the corner ends. Since the first corner bracket 2 and the second corner bracket 3 are independent, it can adapt to different length changes. Since the sleeve 6 is movably connected to the straight plate end 5, it can adapt to different width changes, thereby being able to adapt to slings 1 with frame structures of different sizes for fixation, and has a wide range of adaptability.

[0052] A plurality of second fixing bolts are equidistantly provided in the middle of the right-angle frame. The second fixing bolts are used to penetrate the right-angle frame and the side of the sling 1, thereby enhancing the fixing effect.

[0053] An external bracket is fixed at the right-angle end 4, and the extension direction of the external bracket is adapted to the width direction of the sling 1. For the convenience of description, the external bracket located on the first angle bracket 2 is defined as the first external bracket 13, and the external bracket located on the second angle bracket 3 is defined as the second external bracket 16. The first external bracket 13 is provided with a first hanging ring 14 and a first pulley 15 from top to bottom on the rear side away from the sling 1 and the boom, and the second external bracket 16 is provided with a second pulley 17 and a second hanging ring 18 from top to bottom on the rear side away from the sling 1 and the boom.

[0054] A first side bracket 19 is provided on the outer side of the first angle bracket 2 away from the second angle bracket 3. The first side bracket 19 is provided close to the first outer bracket 13. The extension direction of the first side bracket 19 corresponds to the length direction of the spreader 1. Therefore, the first side bracket 19 and the first outer bracket 13 are distributed at a right angle. The outer end of the first side bracket 19 is rotatably connected to a first swing shaft 20. The outer end of the first swing shaft 20 away from the first angle bracket 2 is equipped with a first guide wheel 21.

[0055] A second side bracket 22 is provided on the outer side of the second angle bracket 3 away from the first angle bracket 2. The second side bracket 22 is provided close to the second outer bracket 16. The extension direction of the second side bracket 22 corresponds to the length direction of the sling 1, so the second side bracket 22 is distributed at right angles to the second outer bracket 16. The outer end of the second side bracket 22 is rotatably connected to the second swing shaft 23. The second swing shaft 23 is coaxial with the first swing shaft 20 and the axial direction is consistent with the length direction of the sling 1. The outer end of the second swing shaft 23 is installed with a second guide wheel 24.

[0056] The first pulley 15, the second pulley 17, the first guide wheel 21 and the second guide wheel 24 are all I-shaped wheels, and are provided with wheel grooves on their circumferences for passing the steel wire.

[0057] A U-shaped baffle 25 is provided on the outer side of the first guide wheel 21 and the second guide wheel 24. The top and bottom ends of the U-shaped baffle 25 are respectively fixed on the wheel axle of the first guide wheel 21 or the second guide wheel 24. The U-shaped baffle 25 is arranged close to the wheel groove of the first guide wheel 21 or the wheel groove of the second guide wheel 24, so as to prevent the steel wire from escaping from the guide wheel and is used to constrain the steel wire and the guide wheel.

[0058] Based on the installation characteristics of the swing shaft, the first guide wheel 21 and the second guide wheel 24 can be adaptively adjusted in angle based on the pulling direction. In the installation of the swing shaft, an anti-slip washer can be added to increase the swing resistance of the swing shaft.

[0059] The height of the first hanging ring 14 corresponds to the height of the wheel groove of the second pulley 17 and the height of the wheel groove of the second guide wheel 24;

[0060] The height of the second hanging ring 18 corresponds to the height of the wheel groove of the first pulley 15 and the height of the wheel groove of the first guide wheel 21 .

[0061] The constraint module includes a vertical plate 26, which is used to be installed below the rotating platform and rotates with the rotating platform, so that the vertical plate 26 is always synchronized with the boom in the same direction. The outer end surface of the vertical plate 26 close to the sling 1 is the installation surface, and support arms are fixed on the left and right sides of the installation surface. The support arms extend horizontally to one side of the boom, and the two sides of the support arm are respectively installed with an outer drum 29 and an inner drum 30 driven by a motor. The outer drum 29 is arranged near the outer end of the support arm away from the vertical plate 26, and the inner drum 30 is arranged near the vertical plate 26 in the middle of the support arm. The outer drum 29 is arranged on the outer side surface of the support arm away from each other, and the inner drum 30 is arranged on the opposite inner side surface of the support arm. The distance between the outer drum 29 and the inner drum 30 is adapted to the width of the sling 1, so that the pulling of the steel wires on both sides is kept as parallel as possible and does not interfere with each other, and the pulling directions of the diagonal ends are consistent, which can improve the stability of the constraint.

[0062] To accommodate different sizes of the sling 1, the support arm and reel can be assembled. The support arm includes a fixed arm 27 and an adjustable arm 28. The inner end of the fixed arm 27 is vertically fixed to the vertical plate 26. The inner reel 30 is mounted on the outer end of the fixed arm 27. A strip frame 31 is fixedly connected to the bottom side of the fixed arm 27. A mounting bracket 32 ​​corresponding to the position of the strip frame 31 is fixed to the bottom side of the adjustable arm 28. The mounting bracket 32 ​​is located below the strip frame 31 and each has multiple equidistant mounting holes. A third fixing bolt is inserted through the overlapping mounting holes, which is used to position the adjustable arm 28 a certain distance from the front end of the fixed arm 27. The outer reel 29 is mounted on the adjustable arm 28. This structure allows the length of the adjustable arm 28 protruding from the fixed arm 27 to be adjusted, thereby adjusting the spacing between the outer reel 29 and the inner reel 30 to correspond as much as possible to the width of the sling 1, thereby achieving a parallel pulling effect for the cable.

[0063] Four steel cables are provided between the restraint module and the follower module, which are defined as a first outer cable 47 , a second outer cable 48 , and an inner cable 49 .

[0064] One end of the first external cable 47 is fixed to the first hanging ring 14. The first external cable 47 starts from the first hanging ring 14, passes through the second pulley 17 and the second guide wheel 24 in sequence, and is wound around the external drum 29 on the same side.

[0065] One end of the second external cable 48 is fixed to the second hanging ring 18. The second external cable 48 starts from the second hanging ring 18, passes through the first pulley 15 and the first guide wheel 21 in sequence, and is wound around the outer drum 29 on the same side.

[0066] There are two inner cables 49 , one end of which is fixed to the fixing rings 9 of the first angle bracket 2 and the second angle bracket 3 respectively, and the other end is wound on the inner reel 30 on the same side.

[0067] Based on the above-mentioned winding method, the first outer cable 47 and the second outer cable 48 are used to pull the two corner ends (away from the boom side) by winding and releasing, while the two inner cables 49 are used to pull the two inner corner ends respectively, thereby realizing independent pulling of the four points of the sling 1.

[0068] Since the lifting of the spreader 1 is only achieved through the steel wire hanging above it, the spreader 1 will rotate and twist horizontally relative to the lifting wire. This is also the main reason for the container to swing left and right and hit the cargo hold or adjacent containers. By pulling the two inner and outer corner ends on the left or right side, the swing of the spreader 1 on the horizontal plane can be effectively prevented, thereby preventing the spreader 1 from twisting left and right on the horizontal plane, greatly reducing the collision of the container, and can quickly assist in positioning the spreader 1 and the container.

[0069] Various sensors are usually configured on the sling 1, including sensors that track information such as height, position, and angle. Corresponding sensors can also be added to the follow-up module to obtain the relative height of the sling 1 and the relative distance from the drum, thereby feeding back the respective winding actions of the inner drum 30 and the outer drum 29, so that the length of the released cable is adapted to the corresponding distance.

[0070] Since the adverse effects caused by torsion are mainly lifting positioning and falling positioning, the position constraint is particularly important. In order to improve the stability of the pulling constraint and make the pulling direction as single as possible, a lifting mechanism with a large retractable capacity is adopted in the installation of the vertical plate 26, including a hanging frame 33. The hanging frame 33 is made of square steel and / or I-beam and other profiles, which is used to hang the entire lifting mechanism on the bottom of the rotating platform. A vertically extending box plate 34 is fixedly installed on the hanging frame. Baffles 35 are provided on both sides of the box plate 34 to block the relevant guide rail components of the lifting mechanism inside. A mounting platform 36 is fixed to the bottom side of the box plate 34.

[0071] A first range-extending frame 37 adapted to its length is provided on the front side of the box plate 34. The first range-extending frame 37 is arranged between the two baffles 35. Two symmetrical optical rod guide rails 38 are installed on the side of the first range-extending frame 37 close to the box plate 34. The optical rod guide rails 38 extend vertically. A one-stroke slider is fitted on the optical rod guide rails 38. A lifting screw 39 rotatably mounted on the first range-extending frame 37 is provided between the two optical rods. A nut is fitted on the lifting screw 39. The nut and the one-stroke slider are both fixed on the mounting platform 36. The lifting screw 39 is driven by a motor to obtain the lifting stroke of the first range-extending frame 37.

[0072] A vertically extending second-range slide rail 40 is symmetrically installed on the left and right sides of the first range-extending frame 37 on a side away from the box plate 34. A second-range slider is slidably fitted on the second-range slide rail 40. A second-range rack 41 mounted on the first range-extending frame 37 is provided between the two second-range slide rails 40. A second-range extender frame 43 that is lifted and lowered relative to the first range-extending frame 37 is provided on the side away from the box plate 34. A second-range motor 42 is installed on the top of the second range-extending frame 43. A second-range gear meshing with the second-range rack 41 is provided on the output shaft of the second-range motor 42. Two second-range sliders are also fixed on the top of the second range-extending frame 43, thereby realizing the driving and stroke constraint of the second range-extending frame 43 relative to the first range-extending frame 37.

[0073] The second range-extending frame 43 is symmetrically installed with vertically extending three-range slide rails 44 on the front side away from the first range-extending frame 37. The three-range slide rails 44 are equipped with three-range sliders. A three-range rack 45 installed on the second range-extending frame 43 is provided between the two three-range slide rails 44. The vertical plate 26 is arranged on the side of the second range-extending frame 43 away from the box plate 34 and is installed to be lifted relative to the second range-extending frame 43. A three-range motor 46 is installed on the top side of the vertical plate 26. A three-range gear meshing with the three-range rack 45 is installed on the output shaft of the three-range motor 46. Two three-range sliders are also fixed on the top of the vertical plate 26, thereby realizing the drive and stroke constraint of the vertical plate 26 relative to the second range-extending frame 43.

[0074] Based on the above structure, the first range-extending frame 37 and the second range-extending frame 43 are used to expand the lifting stroke, so that the vertical plate 26 can be lowered by a large drop, and the height space occupied after being lifted is limited.

[0075] Based on the structural characteristics of the gantry crane, the height of the box plate 34 is adjusted to match the height of the cylinder, ensuring that the bottom end of the box plate 34 is located above the gantry without affecting the space below the gantry. This installation position can be combined with the height of the cylinder to ensure that the space does not affect the passing of vehicles. The height of the first and second range-extending frames 37 and 43 are respectively adjusted to the height of the box to achieve maximum range extension.

[0076] During the lifting process, when the spreader 1 is lowered to lift a container, or when the spreader 1 lowers to load a container onto a truck or ship (cargo warehouse), when the spreader 1 is at or above the top of the deck 34, the vertical plate 26 is located on top of the second range extender 43, the top of the second range extender 43 is close to the top of the first range extender 37, and the top of the first range extender 37 is close to the top of the deck 34. In other words, the vertical plate 26, the first range extender 37, and the second range extender 43 are at the top of their respective lifting strokes. When the spreader 1 is below the top of the deck 34 and gradually descends, the vertical plate 26, the first range extender 37, and the second range extender 43 are activated in sequence, with the vertical plate 26 being lowered first. When the vertical plate 26 reaches the bottom of its lifting stroke, the second range extender 43 is activated, and when the second range extender 43 reaches the bottom of its stroke, the first range extender 37 is activated. When the support arm reaches the same height as the spreader 1, the lifting mechanism is stopped.

[0077] During the lifting and amplitude adjustment process, when the position and height of the sling 1 change, the inner drum 30 and the outer drum 29 are retracted and retracted by rotation, so that the released lengths of the first outer cable 47, the second outer cable 48 and the inner cable 49 remain horizontal to the sling 1, and the two ends of the sling 1 are equidistant from the vertical plate 26.

[0078] Based on the above lifting mechanism, the first outer cable 47, the second outer cable 48 and the inner cable 49 are kept as horizontal as possible to pull the sling 1, and the force at the diagonal ends is more balanced. By constraining the relative diagonal ends, the sling 1 is prevented from twisting and swinging, so that it can be quickly positioned.

Claims

1. A lifting and restraining portal crane, comprising a portal frame, a cylinder, a rotating platform, a lifting arm, and a sling, wherein the sling has a rectangular frame structure; characterized in that: Also includes follower modules and constraint modules: The constraint module is installed at the bottom of the rotating platform and includes two horizontally extending arms arranged side by side. An outer reel and an inner reel are installed on both sides of the arms respectively, the outer reel is arranged at the end of the arm away from the vertical plate, and the inner reel is arranged in the middle of the arm. The cam is secured to a first position, with the first wheel having a first end and a second end, secured to a first position relative to the first gear, and having a first end connected to the second wheel having a first end and a second end connected to the first gear.

2. The lifting and restraining portal crane according to claim 1, characterized in that: The first angle bracket and the second angle bracket both include an L-shaped right-angle bracket, and the inner corners of the right-angle brackets of the first angle bracket and the second angle bracket are arranged relative to each other, one end of the right-angle bracket is provided with a right-angle end and the other end is provided with a straight plate end, the straight plate end is provided with a socket movably connected thereto, the fixing ring is provided on the socket, and the end of the socket close to the sling is provided with a fixing plate fixedly connected thereto, the fixing plate and the fixing ring are arranged in the opposite direction, the fixing plate and the socket are vertically fixed to form an L-shape, a first fixing bolt passes through the fixing plate, and a plurality of second fixing bolts are equidistantly provided in the middle of the right-angle bracket.

3. The lifting and restraining portal crane according to claim 2, characterized in that: A fixing sleeve is vertically passed through the middle of the insert sleeve, a fixing shaft connected to the fixing sleeve for rotation is passed through the fixing sleeve, the outer end of the fixing shaft is fixedly connected to the fixing ring and is formed as one piece, a clearance bar hole is provided in the center of the straight plate end, the fixing sleeve passes through the clearance bar hole and the two are clearance-matched.

4. The lifting and restraining portal crane according to claim 1, characterized in that: The length direction of the first outer bracket and the second outer bracket is consistent with the width direction of the spreader; A first side bracket is provided on the outer side of the first angle bracket away from the second angle bracket, and the first side bracket is arranged close to the first outer bracket. The extension direction of the first side bracket corresponds to the length direction of the spreader. The outer end of the first side bracket is rotatably connected to the first swing shaft. The outer end of the first swing shaft away from the first angle bracket is equipped with a first guide wheel, and the height of the first guide wheel corresponds to the height of the second hanging ring. A second side bracket is provided on the outer side of the second angle bracket away from the first angle bracket. The second side bracket is provided close to the second outer bracket. The extension direction of the second side bracket corresponds to the length direction of the spreader. The outer end of the second side bracket is rotatably connected to the second swing shaft. The outer end of the second swing shaft is installed with a second guide wheel. The height of the second guide wheel corresponds to the height of the first hanging ring. U-shaped blocking bars are provided on the outer sides of the first guide wheel and the second guide wheel.

5. The lifting and restraining portal crane according to claim 1, characterized in that: The support arm includes a fixed arm and an adjusting arm, the inner end of the fixed arm is vertically fixed on the vertical plate, the inner reel is installed on the outer end of the fixed arm, the bottom side of the fixed arm is provided with a strip frame fixedly connected to it, the outer reel is installed on the adjusting arm, and the bottom side of the adjusting arm is fixed with a mounting bracket corresponding to the position of the strip frame, the mounting bracket partially overlaps with the strip frame and a third fixing bolt is fixed through the overlapping part.

6. The lifting and restraining portal crane according to claim 1, characterized in that: The vertical plate is installed at the bottom of the rotating platform through a lifting mechanism. The lifting mechanism includes a hanging frame, on which a vertically extending box plate is fixedly installed. A first range-extending frame adapted to its height is installed in front of the box plate in a liftable manner. A second range-extending frame adapted to its height is installed in front of the first range-extending frame in a liftable manner. The vertical plate is installed in front of the second range-extending frame in a liftable manner. The height of the box plate does not exceed the height of the cylinder.

7. The lifting-constrained portal crane according to claim 6, characterized in that: A mounting platform is fixed to the bottom side of the box plate, and two left-right symmetrical polished rod guide rails are installed on the side of the first range-extending frame close to the box plate. The polished rod guide rails are equipped with a one-way slider. A lifting screw rotatably mounted on the first range-extending frame is provided between the two polished rods, and a nut is equipped on the lifting screw. The nut and the one-way slider are both fixed to the mounting platform; and / or A vertically extending second-range slide rail is symmetrically installed on the left and right sides of the first range-extending frame on a side away from the box plate, a second-range slider is slidably engaged on the second-range slide rail, a second-range rack mounted on the first range-extending frame is provided between the two second-range slide rails, a second-range motor is installed on the top of the second range-extending frame, a second-range gear meshing with the second-range rack is provided on the output shaft of the second-range motor, and two second-range sliders are also fixed on the top of the second range-extending frame; and / or The second range-extending frame is symmetrically installed with a vertically extending three-range slide rail on the front side away from the first range-extending frame, and the three-range slide rail is equipped with a three-range slider. A three-range rack installed on the second range-extending frame is provided between the two three-range slide rails. A three-range motor is installed on the top side of the vertical plate, and a three-range gear meshing with the three-range rack is installed on the output shaft of the three-range motor. Two three-range sliders are also fixed on the top of the vertical plate.

8. The lifting and restraining portal crane according to claim 6, characterized in that: When the spreader is lower than the top of the box plate and gradually falls, the vertical plate, the first range-extending frame, and the second range-extending frame start to descend in sequence. When the support arm is at the same height as the spreader, the lifting mechanism is stopped.

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