Low-altitude gantry crane

Abstract

The utility model discloses a low-altitude gantry crane. The gantry crane aims at solving the technical problem that an existing gantry crane cannot be laid and used in the urban limited space construction environment. The main beam is erected above the ventilation shaft through a plurality of supporting legs matched with the height of the limited space, the tackle moves along the main beam, the hoisting assembly is fixed to the tackle and comprises a hoisting rope and a hoisting hook, and the slag hopper is arranged at the hoisting hook in a hoisting mode. The slag hopper comprises a bottom plate which is correspondingly hinged to the bottom end of the corresponding side wall and arranged in an opening and closing mode. The low-altitude gantry crane can adapt to special construction environments with limited height and limited two sides, the residue discharging process is efficient and safe, and residue soil is thoroughly dumped without residues.

Description

Technical Field

[0001] This application relates to the technical field of lifting equipment, and particularly relates to a low-altitude gantry crane. Background Art

[0002] A gantry crane is a bridge-type crane whose bridge is supported on ground tracks through two side legs. The working principle of a gantry crane is to lift, lower, and move a lifted object through the coordinated action of a crane beam and a crane rope. When the crane beam moves along the main beam, the crane rope will move accordingly, thereby changing the position of the lifted object. The lifting and telescoping of the crane rope are controlled by a crane hook on the crane beam and are achieved through mechanical devices such as electric motors and gear transmissions.

[0003] The gantry crane in subway shield construction, as an important lifting and transportation equipment, is mainly used for the vertical and horizontal transportation of materials such as muck, segments, and mortar during the tunneling process of the shield machine. At the ventilation shaft, the role of the gantry crane is particularly crucial because it not only transports materials from the ground to the underground working face but also transports the excavated muck out of the ground, ensuring the continuity and efficiency of the construction process. However, as public transportation, subway stations are generally located in the bustling areas of the city, which will result in limited layout space for the gantry crane, and it can only be limited to a specific area. Moreover, for some ventilation shafts located under urban viaducts, due to limited net height, the existing gantry cranes cannot be installed, and only manual hoists or electric hoists installed above the ventilation shaft can be relied on to transport muck manually, which is time-consuming, laborious, and inefficient.

[0004] The information disclosed in this background art section is only used to deepen the understanding of the background art of the present disclosure and should not be regarded as an admission or any form of implication that this information constitutes the prior art known to those skilled in the art. Summary of the Invention

[0005] In view of at least one of the above technical problems, the present disclosure provides a low-altitude gantry crane, aiming to solve the technical problem that the existing gantry crane cannot be installed and used in the construction environment of urban restricted spaces.

[0006] According to one aspect of the present disclosure, a low-altitude gantry crane is provided, which includes a main beam erected above a ventilation shaft through a plurality of legs matching the height of the restricted space, a trolley moving along the main beam, a lifting assembly fixed at the trolley and including a lifting rope and a hook, and a slag bucket suspended at the hook; the slag bucket includes a bottom plate hinged and opened / closed corresponding to the bottom end of the corresponding side wall.

[0007] In some embodiments of the present disclosure, the low-altitude gantry crane includes two parallel main beams, a moving groove is provided at the top of the main beam, and the trolley moves along the main beam through traveling wheels that are rollingly embedded in the moving groove.

[0008] In some embodiments of the present disclosure, the lifting assembly further includes a drum fixedly arranged relative to the pulley block and used for winding the lifting rope, a reduction motor used for driving the drum to rotate, and a movable pulley fixed with the hook and cooperating with the lifting rope.

[0009] In some embodiments of the present disclosure, a lock used for buckling the bottom plate is arranged at the outer edge of the bottom of the side wall of the slag bucket.

[0010] In some embodiments of the present disclosure, sliding grooves are symmetrically arranged at the bottoms of the two side walls perpendicular to the hinge rotation direction of the bottom plate, and an opening and closing plate parallel to the bottom plate and arranged below the bottom plate for limiting the opening and closing angle of the bottom plate is slidably embedded in the sliding grooves.

[0011] In some embodiments of the present disclosure, a limiting plate is arranged at the edge of the opening and closing plate corresponding to the hinged side of the bottom plate, and a push-pull handle is arranged at the limiting plate.

[0012] In some embodiments of the present disclosure, a baffle is arranged at the end of the sliding groove corresponding to the hinged side of the bottom plate, and a stop rod used for abutting against the baffle for limiting is arranged at the end of the opening and closing plate corresponding to the opposite side of the limiting plate.

[0013] In some embodiments of the present disclosure, a cable slide rail arranged along the main beam direction is fixedly arranged on one side of the main beam, and a plurality of sliding members used for being fixedly arranged relative to the cable are slidably arranged at the cable slide rail.

[0014] In some embodiments of the present disclosure, the cable slide rail is fixedly connected with the main beam through a plurality of brackets fixed at the corresponding middle position at the top of the cable slide rail, and the sliding member includes rollers symmetrically arranged on both sides of the cable slide rail.

[0015] One or more technical solutions provided in the embodiments of the present application have at least any one of the following technical effects or advantages:

[0016] 1. Through the legs with a height adapted to the height of the restricted space and fixed to the ground, the problem that the existing gantry crane cannot adapt to the lifting requirements in the environment restricted by the existing roads under the bridge and on both sides can be effectively solved, and the low efficiency of transferring construction waste by hand pulling or electric hoist can be avoided.

[0017] 2. The bottom plate of the slag bucket can be opened and closed, which can avoid the requirement for the space height when turning over the slag bucket by means of external force, so as to adapt to the height-restricted environment under the bridge. The slag can be directly unloaded by opening the bottom plate, and at the same time, the residue caused by incomplete turning over of the slag in the slag bucket can be avoided.

[0018] 3. The opening and closing plate can effectively control the opening and closing angle of the bottom plate, thereby determining the slag discharge rate; at the same time, the opening and closing of the bottom plate can be easily controlled through the opening and closing plate, reducing the pressure load that needs to be overcome when the bottom plate is opened. Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of a low-altitude gantry crane in an embodiment of the present application.

[0020] Figure 2 It is a schematic structural diagram of a slag bucket in another embodiment of the present application.

[0021] Figure 3 It is a schematic structural diagram of the cable moving part in an embodiment of the present application.

[0022] In the above figures, 1 is a leg, 2 is a main beam, 3 is a pulley, 31 is a drum, 32 is a movable pulley, 4 is a slag bucket, 40 is a bottom plate, 41 is a chute, 42 is an opening and closing plate, 43 is a baffle, 44 is a stop rod, 45 is a limit plate, 46 is a push-pull handle, 50 is a cable, 51 is a cable slide rail, 52 is a bracket, and 53 is a sliding part. Detailed Embodiments

[0023] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "vertical", "horizontal", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0024] In order to better understand the technical solution of the present application, the above technical solution will be described in detail below in conjunction with the drawings of the specification and specific embodiments.

[0025] To solve the problem that the existing gantry crane cannot be applied to the limited space of urban road bridges, this example discloses a low-altitude gantry crane. See Figure 1, which includes a number of legs 1 and a main beam 2. In this embodiment, the low-altitude gantry crane includes two parallel main beams 2, and a longitudinal beam perpendicular to the two main beams is provided between the two main beams 2 to strengthen the connection strength between the two main beams. Legs 1 are fixed to the bottoms of both ends of the two main beams 2. In this example, a total of four legs are provided, and the height of each leg 1 matches the restricted space of the bridge, so that the low-altitude gantry crane can be firmly installed and fixed in the limited space under the bridge. Thus, the main beam 2 is placed directly above the ventilation shaft through the legs, thereby realizing the lifting and transportation of the slag. However, due to the construction environment in the downtown area of the city, there are roads on both sides of the bridge, which further limits the working range of the gantry crane. Therefore, in this embodiment, each leg 1 is directly fixed to the ground, so that the working range of the low-altitude gantry crane is in the area below the bridge. In order to facilitate the dumping of the debris after it is lifted above the ground, the slag storage yard is set next to the ventilation shaft and below the main beam in this example. Therefore, the debris can be directly dumped after being lifted by the low-altitude gantry crane, avoiding long-distance transportation and improving the efficiency of slag transportation.

[0026] In this embodiment, since the slag storage yard and the ventilation shaft are arranged in parallel and are both located below the main beam of the low-altitude gantry crane, the slag soil needs to be transported to the slag storage yard next to it for dumping after being hoisted out of the ventilation shaft. For this purpose, in this embodiment, a pulley is slidably arranged on the top of the main beam 2 to realize the transportation of the slag soil from the shaft to the slag storage yard through the pulley. Figure 1 The pulley 3 includes a frame, which includes two oppositely arranged side panels, each of which has a running wheel at each end. The overall movement of the pulley is achieved by the rolling of the running wheels. Correspondingly, a movable groove matching the running wheels is provided at the top of the main beam 2, and the running wheels are correspondingly embedded therein. The pulley 3 is moved along the main beam 2 as required by moving along the groove. In this embodiment, in order to drive the movement of each running wheel, the wheel axle of each running wheel is respectively connected to a drive motor. The drive motor provides kinetic energy for the running wheel to roll along the moving groove, thereby controlling the on-off and speed of the drive motor, and adjusting the position and movement speed of the pulley 3 relative to the main beam 2 according to actual needs.

[0027] In addition, in order to realize the lifting function of the low-altitude gantry crane, a lifting component is fixed at 3 locations on the pulley. Figure 1, in this embodiment, the lifting assembly includes a drum 31 fixedly arranged relative to the pulley 3. Fixed plates are respectively arranged at both ends of the drum 31 and fixedly arranged with the pulley frame. Both ends of the drum rotating shaft are respectively passed through the corresponding fixed plates through bearings, and the drum rotating shaft is drivingly connected with a speed motor, so as to drive the rotation of the drum through the speed motor. A lifting rope is wound around the drum 31. In this example, the lifting rope is a steel wire rope. One end of the lifting rope is fixed, and the other end is wound around the drum. A movable pulley 32 is arranged in the rope. Thus, through the rotation of the drum, the release and tightening of the lifting rope can be realized. Furthermore, through the change of the length of the lifting rope, the change of the height position of the movable pulley 32 can be realized, so as to achieve the purpose of lowering and lifting. In addition, in this embodiment, a hook is fixedly arranged at the movable pulley 32 and moves with the movement of the movable pulley. A slag bucket 4 is hung at the hook. Thus, the lifting and lowering of the slag bucket are realized through the rotation of the drum, and further the purpose of transporting the muck out of the well is achieved.

[0028] However, when the existing slag bucket dumps slag, it needs to be flipped to achieve dumping. Therefore, it is required that the slag bucket needs to be lifted to a certain height position. However, due to the limited working space of the low-altitude gantry crane, it is difficult to flip the slag bucket. And affected by the water content of the muck, the muck in the slag bucket may remain during the slag flipping process, resulting in incomplete slag flipping. For this reason, in this embodiment, the slag bucket 4 includes a bottom plate arranged at the bottom position of the slag bucket and hinged to the side wall for opening and closing. Thus, through the openable bottom plate, when the slag bucket dumps slag, only the bottom plate needs to be opened, and the slag can naturally fall under the action of its own gravity without the need to rely on external force for slag flipping operation. The slag dumping efficiency can be greatly improved, and at the same time, the limitation of the limited space under the road bridge is broken through. Specifically, one end of the bottom plate is hinged to the bottom end of one side wall of the slag bucket, so that the bottom plate can rotate around the hinge axis to realize the opening and closing of the bottom plate. And considering that when the slag bucket holds the muck, the bottom plate needs to be reliably closed. For this reason, in this embodiment, a lock catch is arranged at the outer edge of the side wall of the slag bucket opposite to the hinge axis for limiting the bottom plate to ensure that the bottom plate reliably closes the bottom of the slag bucket during the muck transportation process and avoid slag leakage.

[0029] In some other embodiments, considering that when the slag bucket dumps slag, due to the weight of the muck in the slag bucket being concentrated at the bottom plate, it is difficult to open the bottom plate when opening the bottom plate because it needs to overcome the pressure brought by the weight of the muck. For this reason, in this example, refer to Figure 2, a bottom plate 40 is also hinged to the bottom of the slag bucket 4. To achieve the on-demand opening and closing of the bottom plate 40, sliding grooves 41 are symmetrically provided at the bottoms of the two side walls of the slag bucket 4 perpendicular to the hinging direction of the bottom plate 40. Among them, in order to prevent the sliding grooves 41 from restricting the opening and closing of the bottom plate 40, the distance between the two side sliding grooves is set to be greater than the corresponding width of the bottom plate; in this example, the sliding grooves 41 are made of angle steel. In addition, an opening and closing plate 42 is slidably embedded in the sliding grooves 41. The opening and closing plate 42 is arranged parallel to the bottom plate 40 and below the bottom plate 40. Thus, by the movement of the opening and closing plate 42 along the sliding grooves, the opening and closing angle of the bottom plate 40 is determined. Specifically, when the opening and closing plate 42 is completely inserted into the sliding grooves, due to the restriction of the bottom plate 40 caused by the opening and closing plate 42, the bottom plate 40 cannot be opened. At this time, the bottom plate closes the bottom of the slag bucket; as the opening and closing plate 42 is gradually withdrawn from the sliding grooves 41, the bottom plate 40 is tangent to the end of the opening and closing plate 42, and the bottom plate 40 gradually opens. Thus, the opening and closing angle of the bottom plate 40 can be controlled by controlling the withdrawal length of the opening and closing plate 42. And during this process, since one end of the bottom plate is hinged to the wall of the slag bucket and the other side is tangent to the opening and closing plate 42, only part of the muck in the slag bucket is transferred to the opening and closing plate 42, so that the movement of the opening and closing plate 42 does not have to overcome a large bottom plate pressure, facilitating the opening and closing operation of the bottom plate. At the same time, the opening and closing angle of the bottom plate can also be adjusted by the position of the opening and closing plate 42, thereby changing the slag discharging speed.

[0030] In addition, in order to avoid the problem that it is not easy to insert the opening and closing plate 42 into the sliding grooves 41 after it is completely withdrawn and to avoid the impact on the opening and closing plate 42 caused by the large-angle opening of the bottom plate 40, which affects the construction safety. In this example, a baffle 43 is provided at the end of the sliding groove 41 corresponding to the hinged side of the bottom plate 40, and stop bars 44 are respectively provided on both sides of the end of the opening and closing plate 42 for tangency with the bottom plate 40. Thus, the stop bars 44 are restricted by the baffle 43 to prevent the opening and closing plate 42 from disengaging from the sliding grooves 41. In addition, in this example, a limiting plate 45 is provided at the edge of the opening and closing plate 42 corresponding to the hinged side of the bottom plate, thereby limiting the depth of insertion of the opening and closing plate 42 into the sliding grooves 41. At the same time, a push-pull handle is provided at the limiting plate 45, so as to facilitate the control of the pushing and pulling of the opening and closing plate 42.

[0031] See Figure 1 , considering that the trolley 3 needs power supply when moving along the main beam. Therefore, in this embodiment, a cable slide rail 51 ( Figure 1 only part of the structure is shown) is provided on one side of the main beam. The telescopic movement of the cable 50 with the trolley is realized through a slider moving along the cable slide rail 51 to ensure the power supply of the trolley. Specifically, see Figure 3 , the cable slide rail 51 is fixed to one side of the main beam through a plurality of brackets 52. In this example, the cable slide rail is made of angle steel, and the brackets are fixed at the corners of the angle steel. A plurality of sliders 53 are slidably provided on the cable slide rail 51. See Figure 3, the slider 53 includes a channel-shaped plate. Roller wheels are respectively provided at both ends of the channel-shaped plate. The two roller wheels slide along both sides of the cable slide rail respectively. Thus, the smooth movement of the channel-shaped plate along the cable slide rail is realized through the roller wheels. A cable fixing member is provided below the channel-shaped plate. In this example, the cable fixing member includes two parallelly arranged fixing plates, and the two plate bodies are fixedly connected by bolts. Thus, by adjusting the tightening degree of the bolts, the distance between the two fixing plates is controlled to be tangent to the cable for fixation. Thus, through the slider 53 that slides along the cable slide rail 51, the movement of the cable 50 along with the trolley is realized.

[0032] Although some preferred embodiments of the present application have been described, those skilled in the art can make additional changes and modifications to these embodiments once they know the basic creative concept. Therefore, the appended claims are intended to be construed as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0033] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these modifications and variations.

Claims

1. An overhead crane for low altitude, characterized in that, It includes a main beam erected above the ventilation shaft through several leg supports that match the height of the confined space, a pulley moving along the main beam, a lifting assembly fixed at the pulley and including a lifting rope and a hook, and a slag bucket suspended at the hook; the slag bucket includes a bottom plate that is hinged and opened and closed corresponding to the bottom end of the corresponding side wall.

2. The low-altitude gantry crane according to claim 1, characterized in that, It includes two main beams arranged in parallel, and a moving groove is provided at the top of the main beam, and the pulley moves along the main beam correspondingly through a walking wheel that is rollingly embedded in the moving groove.

3. The low-altitude gantry crane according to claim 1, characterized in that, The lifting assembly further includes a drum that is relatively fixedly arranged with the pulley and is used for winding the lifting rope, a reduction motor for driving the drum to rotate, and a movable pulley fixed with the hook and cooperating with the lifting rope.

4. The low-altitude gantry crane according to claim 1, characterized in that, A lock for buckling the bottom plate is provided at the bottom outer edge of the side wall of the slag bucket.

5. The low-altitude gantry crane according to claim 1, characterized in that, Chutes are symmetrically provided at the bottoms of the two side walls perpendicular to the hinge rotation direction of the bottom plate, and an opening and closing plate that is parallel to the bottom plate and is arranged below the bottom plate for limiting the opening and closing angle of the bottom plate is slidingly embedded in the chutes.

6. The low-altitude gantry crane according to claim 5, wherein A limiting plate is provided at the edge of the opening and closing plate corresponding to the hinged side of the bottom plate, and a push-pull handle is provided at the limiting plate.

7. The low-altitude gantry crane according to claim 6, wherein A baffle is provided at the end of the chute corresponding to the hinged side of the bottom plate, and a stop rod for abutting and limiting against the baffle is provided at the end of the opening and closing plate corresponding to the opposite side of the limiting plate.

8. The low-altitude gantry crane according to claim 1, wherein A cable slide rail arranged along the main beam direction is fixedly provided on one side of the main beam, and several sliding members for relatively fixing with the cable are slidably arranged at the cable slide rail.

9. The low-altitude gantry crane according to claim 8, wherein, The cable slide rail is fixedly connected with the main beam through several brackets fixed at the corresponding middle position at the top of the cable slide rail, and the sliding member includes roller wheels symmetrically arranged on both sides of the cable slide rail.

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