A double-head hoist portal crane

Abstract

The utility model relates to the technical field of hoisting, concretely to a double -end hoist door crane, including platform, still include: middle frame, the middle frame is fixed in the top surface middle part of platform, two steel wire rope take -up and pay -off mechanism, two steel wire rope take -up and pay -off mechanism all install on the top surface of platform, two suspension arms, two suspension arms are respectively hinged in the left and right side edges of platform, two pull frames, two pull frames are respectively hinged in the left and right sides of middle frame top, and the end away from the middle frame of each pull frame is hinged with corresponding suspension arm, the utility model middle frame is fixed in the middle part of platform and forms symmetrical support core, and the suspension arm hinged on the left and right sides under the pull of pull frame is symmetrically inclined extension, and the operation area of two suspension arms can cover the left and right sides of tunnel cross section and different axis positions respectively with the cooperation of two sides independent steel wire rope take -up and pay -off mechanism, and can complete multi -station hoisting without frequently moving portal, and the operation time consumption due to the adjustment of station position and the collision risk in narrow space are greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of lifting technology, specifically a double-headed gantry crane. Background Technology

[0002] During tunnel construction, cranes are indispensable core equipment, undertaking the task of transferring and installing various heavy materials. From the steel arches and steel mesh required for initial support, to the formwork and embedded parts used for secondary lining construction, and the prefabricated components and pipes required for the construction of temporary facilities inside the tunnel, all rely on cranes to complete precise spatial displacement and positioning.

[0003] Existing tunnel cranes are mostly single-head gantry cranes. Their structure mainly includes pre-embedded steel rails laid at the bottom of the tunnel, a gantry main body straddling the steel rails, a single boom fixed to one side of the gantry, a hoisting mechanism (including a winch, hook, and wire rope assembly) installed at the end of the boom, and a horizontal traveling mechanism that drives the gantry to move along the steel rails. Among them, the gantry main body serves as the core load-bearing frame, and its movement is guided by the bottom wheel assembly in cooperation with the steel rails; the single boom adopts a cantilever or inclined bracing arrangement, and the hoisting mechanism drives the hook to complete the lifting and lowering operation of the heavy object by winding and unwinding the wire rope.

[0004] However, the operating range of a single-boom gantry crane is limited, only able to lift items within a fixed area on one side of the gantry. If operations are required at different tunnel sections (such as the left and right arch sections, top and bottom) or different axis positions, the gantry must be frequently moved to adjust its position. This not only increases operation time but also increases the risk of collisions between the gantry and surrounding rock or construction equipment due to the narrow tunnel space. Therefore, we propose a double-headed lifting gantry crane to effectively solve these drawbacks. Utility Model Content

[0005] The purpose of this utility model is to provide a double-headed gantry crane to solve the problem of limited operating coverage of a single boom in the prior art mentioned in the background section.

[0006] This utility model is achieved through the following technical solution: a double-headed gantry crane, including a platform, and further comprising:

[0007] The central frame is fixed to the center of the top surface of the platform;

[0008] Two wire rope winding and unwinding mechanisms are installed on the top surface of the platform, and the two wire rope winding and unwinding mechanisms are located on the left and right sides of the central frame, respectively.

[0009] Two booms are hinged to the left and right edges of the platform, respectively, with each boom extending upwards at an angle.

[0010] Two tie rods are hinged to the left and right sides of the top of the central frame, respectively, and the end of each tie rod away from the central frame is hinged to the corresponding boom.

[0011] Optionally, the central frame includes two A-frames and several first connecting rods;

[0012] Two A-frame supports are fixed at intervals along the front-to-back direction to the top of the platform, and several first connecting rods are fixed parallel to each other and at intervals between the two A-frame supports;

[0013] One of the tie rods is hinged to one side of the two A-braces, and the other tie rod is hinged to the other side of the two A-braces.

[0014] Optionally, the wire rope take-up and unwinding mechanism includes a take-up and unwinding drum, a safety brake, a brake disc, and a drive motor;

[0015] The take-up and unwinding drum is rotatably connected to the top of the platform via a drum shaft. The brake disc is fixed to one end of the take-up and unwinding drum. The safety brake is installed on the top of the platform and cooperates with the brake disc. The drive motor is installed on the top of the platform and its output end is connected to the drum shaft for transmission.

[0016] Optionally, the boom includes two main beams and several second connecting rods;

[0017] One end of each main beam is hinged to the edge of the platform, and the other end of each main beam is hinged to the tie rod; a fixed pulley block is fixed at the end of each main beam near the tie rod; the projection of the two main beams on the horizontal plane is V-shaped, and each second connecting rod is parallel and fixed between the two main beams at intervals.

[0018] Optionally, the tie rod includes two tie rods and several third connecting rods;

[0019] Two tie rods are set parallel and spaced apart, one end of each tie rod is hinged to the central frame, and the other end of each tie rod is hinged to the boom; each third connecting rod is fixed between the two tie rods in parallel and spaced apart.

[0020] Optionally, the platform has four parallel and spaced legs at its bottom, with two legs on the same side having a crossbeam fixed to their bottoms, and two drive trolleys installed at intervals along their length at the bottom of each crossbeam.

[0021] Optionally, the drive trolley includes a frame, a geared motor, and a wheel set;

[0022] The frame is fixed to the bottom of the crossbeam, the wheel set is rotatably connected to the frame, and the geared motor is mounted on the frame with its output end connected to the wheel set for transmission.

[0023] Compared with the prior art, this utility model provides a double-headed gantry crane, which has the following beneficial effects:

[0024] The central frame of this utility model is fixed in the middle of the platform to form a symmetrical support core. The booms on the left and right sides are respectively hinged and extend obliquely in a symmetrical manner under the pull of the tie frame. With the help of the independent wire rope winding and unwinding mechanism on both sides, the working area of ​​the two booms can cover the left and right sides of the tunnel cross section and different axis positions respectively. Multi-position hoisting can be completed without frequent movement of the gantry, which greatly reduces the operation time caused by adjusting the position and the risk of collision in narrow space. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0026] Figure 2 This is a schematic diagram of the platform of this utility model;

[0027] Figure 3 This is a schematic diagram of the frame of this utility model;

[0028] Figure 4 This is a schematic diagram of the wire rope winding and unwinding mechanism of this utility model;

[0029] Figure 5 This is a schematic diagram of the boom of this utility model;

[0030] Figure 6 This is a schematic diagram of the pull frame of this utility model;

[0031] Figure 7 This is a schematic diagram of the support leg of this utility model;

[0032] Figure 8 This is a schematic diagram of the crossbeam of this utility model;

[0033] Figure 9 This is a schematic diagram of the drive trolley of this utility model.

[0034] In the diagram: 1. Platform; 2. Mid-frame; 201. A-frame support; 202. First connecting rod; 3. Wire rope winding and unwinding mechanism; 301. Winding and unwinding drum; 302. Safety brake; 303. Brake disc; 304. Drive motor; 4. Boom; 401. Main beam; 402. Second connecting rod; 403. Fixed pulley block; 5. Tie frame; 501. Tie rod; 502. Third connecting rod; 6. Outrigger; 7. Crossbeam; 8. Drive trolley; 801. Frame; 802. Gear motor; 803. Wheel set. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] Please see Figures 1 to 9 A double-headed gantry crane includes a platform 1, the main body of which is welded from steel plates and structural steel. For ease of transportation and disassembly, platform 1 adopts a split-type bolted connection structure and is equipped with positioning holes for quick assembly and disassembly. Platform 1 serves as the installation foundation and load-bearing base for each core component, and also for installing auxiliary components such as electrical cabinets and cameras. A perimeter fence provides safety protection.

[0037] This embodiment also includes: a central frame 2, two wire rope winding and unwinding mechanisms 3, two booms 4, and two tie rods 5.

[0038] The central frame 2 is fixed to the center of the top surface of the platform 1, serving as the core support component of the overall structure. Two wire rope retraction mechanisms 3 are installed on the top surface of the platform 1, acting as the core driving components for lifting heavy objects; these mechanisms are located on the left and right sides of the central frame 2, respectively. Two booms 4 are hinged to the left and right edges of the platform 1, each extending upwards at an angle. Two tie rods 5 are hinged to the left and right sides of the top of the central frame 2, with the end of each tie rod 5 furthest from the central frame 2 hinged to the corresponding boom 4, serving as key load-bearing components connecting the central frame 2 and the booms 4. This arrangement creates a symmetrical support core for the central frame 2, with the booms 4 extending symmetrically at an angle under the pull of the tie rods 5. Combined with the independently operating wire rope retraction mechanisms 3, the working areas of the two booms 4 can cover the left and right sides of the tunnel cross-section and different axial positions, enabling multi-position lifting without frequent gantry movement. This significantly reduces operational time spent adjusting positions and the risk of collisions in confined spaces.

[0039] The following is an introduction to the middle frame 2:

[0040] The central frame 2 includes two A-frame supports 201 and several first connecting rods 202. The two A-frame supports 201 are fixed at intervals along the front-to-back direction to the top of the platform 1, with their bottom edges forming a rigid connection to the platform 1, and their tops forming symmetrical load-bearing support points. Several first connecting rods 202 are fixed parallel to each other and at intervals between the two A-frame supports 201, integrating the two independent A-frame supports 201 into a whole frame through lateral bracing, which significantly enhances the torsional resistance and overall rigidity of the central frame 2.

[0041] One of the tie rods 5 is hinged to one side of the two A-braces 201, and the other tie rod 5 is hinged to the other side of the two A-braces 201. This double-node hinge design not only allows the tension of the tie rod 5 to be evenly transmitted to the two A-braces 201, but also provides stable upper support for the tilting operation of the boom 4.

[0042] The following is a description of the wire rope take-up and release mechanism 3:

[0043] The wire rope winding and unwinding mechanism 3 includes a winding and unwinding drum 301, a safety brake 302, a brake disc 303, and a drive motor 304. The winding and unwinding drum 301 is rotatably connected to the top of the platform 1 via a drum shaft. The drum surface has spiral grooves for orderly winding of the hoisting wire rope (one end of the wire rope is fixed to the drum, and the other end passes through the end of the boom 4 and connects to the hook). The brake disc 303 is fixed to one end of the winding and unwinding drum 301 and rotates synchronously with the drum. The safety brake 302 is installed on the top of the platform 1 and cooperates with the brake disc 303. Its brake shoes can be driven by electromagnetic force or hydraulic pressure to adhere to the brake disc 303, achieving emergency braking through friction. The drive motor 304 is installed on the top of the platform 1, and its output end is connected to the drum shaft for transmission. Specifically, the output end of the drive motor 304 is connected to the drum shaft in sequence via a coupling and a reduction gearbox, allowing for precise control of the wire rope winding and unwinding speed by adjusting the rotation speed.

[0044] During operation, the drive motor 304 outputs torque through the gearbox to drive the winding drum 301 to rotate in both directions, thereby realizing the winding or unwinding of the wire rope and completing the lifting and lowering action of the hook. When it is necessary to pause or brake in an emergency, the safety brake 302 is activated, which clamps the brake disc 303 through the brake shoes to force the drum to stop rotating, ensuring that the load is suspended stably.

[0045] The following is a description of boom 4:

[0046] The boom 4 comprises two main beams 401 and several second connecting rods 402. One end of each main beam 401 is hinged to the edge of the platform 1, and the other end of each main beam 401 is hinged to the tie frame 5. A fixed pulley group 403 is fixed at the end of each main beam 401 near the tie frame 5. By changing the direction of force on the wire rope, the pulley group 403 transmits the traction force of the wire rope winding mechanism 3 to the hook group, thereby realizing the lifting function of the heavy object. The projection of the two main beams 401 on the horizontal plane is V-shaped. The second connecting rods 402 are fixed parallel and spaced between the two main beams 401. The lateral bracing enhances the overall rigidity of the two main beams and ensures the structural stability of the boom under load.

[0047] The following is a description of the tensioner 5:

[0048] The tie rod 5 includes two tie rods 501 and several third connecting rods 502. The two tie rods 501 are parallel and spaced apart, with one end of each tie rod 501 hinged to the central frame 2 and the other end of each tie rod 501 hinged to the boom 4. The third connecting rods 502 are fixed parallel and spaced apart between the two tie rods 501, forming a lateral tie support. This makes the two tie rods 501 form an integral load-bearing unit, which not only enhances the tie rod 5's own resistance to lateral bending but also ensures that the two tie rods 501 are subjected to balanced forces through the rigid constraint of the third connecting rods 502, avoiding deformation caused by unilateral overload.

[0049] When the boom 4 lifts a heavy object, the tie rod 501 will generate a tensile force along its axis, which is distributed to the platform 1 through the A-bracing 201 of the middle frame 2. At the same time, it works with the hinge point between the boom 4 and the platform 1 to form a triangular stable support, effectively offsetting the downward tilting moment of the boom 4 due to the load, and providing a key guarantee for the stability of the double-headed lifting.

[0050] In this embodiment, it should be added that four parallel and spaced support legs 6 are arranged at the bottom of the platform 1 as core load-bearing columns. The main body of the support legs is formed by flat welding of steel plates and structural steel. The upper and lower flange surfaces are precision machined to ensure the installation accuracy of the mating surfaces, and each is equipped with a positioning pin for installation alignment. The upper and lower connection parts of the support legs 6 are fastened with high-strength bolts, which not only ensures a rigid connection with the platform 1 and the structure below, but also improves the assembly stability through the synergistic effect of the positioning pins and bolts. They mainly bear the load support function of the platform 1 and the lifting mechanism.

[0051] Two outriggers 6 located on the same side are fixed to a crossbeam 7 at their bottom. Two drive trolleys 8 are installed at intervals along the length of each crossbeam 7 at its bottom. The crossbeam 7 is also made of steel plate and shaped steel welded together. Its upper and lower flange surfaces are machined to ensure connection accuracy and are equipped with locating pins for installation and positioning. The whole is rigidly connected to the bottom of the outrigger 6 and the drive trolley 8 by high-strength bolts, which serve as a bridge connecting the outrigger 6 and the trolley, and evenly transfer the load borne by the outrigger 6 to the traveling mechanism below.

[0052] The following is an introduction to the drive trolley 8:

[0053] The drive trolley 8 includes a frame 801, a geared motor 802, and a wheel set 803. The frame 801 is fixed to the bottom of the crossbeam 7. The wheel set 803 is rotatably connected to the frame 801, and the wheel flanges are adapted to the rail heads of the tunnel's pre-embedded steel rails. The geared motor 802 is mounted on the frame 801, and its output end is connected to the wheel set 803 for transmission. During operation, the drive trolleys 8 on both sides of the crossbeam 7 achieve coordinated operation through electrical synchronous control, driving the entire gantry crane to move horizontally along the steel rails, providing reliable support for the flexible movement of the gantry crane in narrow tunnels.

[0054] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0055] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A double-headed gantry crane, comprising a platform (1), characterized in that, Also includes: The middle frame (2) is fixed to the middle of the top surface of the platform (1); Two wire rope winding and unwinding mechanisms (3) are installed on the top surface of the platform (1) and are located on the left and right sides of the middle frame (2). Two booms (4) are respectively hinged to the left and right edges of the platform (1), and each boom (4) extends upward at an angle; Two tie rods (5) are respectively hinged to the left and right sides of the top of the middle frame (2), and the end of each tie rod (5) away from the middle frame (2) is hinged to the corresponding boom (4).

2. The double-headed gantry crane according to claim 1, characterized in that: The central frame (2) includes two A-frame supports (201) and several first connecting rods (202); Two A-frame supports (201) are fixed at intervals on the top of the platform (1) in the front-to-back direction, and several first connecting rods (202) are fixed parallel to each other and at intervals between the two A-frame supports (201); One of the tie rods (5) is hinged to one side of the two A-braces (201), and the other tie rod (5) is hinged to the other side of the two A-braces (201).

3. A double-headed gantry crane according to claim 1, characterized in that: The wire rope winding and unwinding mechanism (3) includes a winding and unwinding drum (301), a safety brake (302), a brake disc (303), and a drive motor (304); The take-up and unwinding drum (301) is rotatably connected to the top of the platform (1) via a drum shaft. The brake disc (303) is fixed to one end of the take-up and unwinding drum (301). The safety brake (302) is installed on the top of the platform (1) and cooperates with the brake disc (303). The drive motor (304) is installed on the top of the platform (1) and its output end is connected to the drum shaft for transmission.

4. A double-headed gantry crane according to claim 1, characterized in that: The boom (4) includes two main beams (401) and several second connecting rods (402); One end of each main beam (401) is hinged to the edge of the platform (1), and the other end of each main beam (401) is hinged to the tie frame (5); a fixed pulley group (403) is fixed at the end of each main beam (401) near the tie frame (5); the projection of the two main beams (401) on the horizontal plane is V-shaped, and each second connecting rod (402) is parallel and fixed between the two main beams (401) at intervals.

5. A double-headed gantry crane according to claim 1, characterized in that: The tie rod (5) includes two tie rods (501) and several third connecting rods (502); Two tie rods (501) are set in parallel and spaced apart. One end of each tie rod (501) is hinged to the middle frame (2), and the other end of each tie rod (501) is hinged to the boom (4). Each third connecting rod (502) is fixed between the two tie rods (501) in parallel and spaced apart.

6. A double-headed gantry crane according to claim 1, characterized in that: The platform (1) has four parallel and spaced legs (6) at its bottom. The bottom of two legs (6) on the same side is fixed with a crossbeam (7). Two drive trolleys (8) are installed at intervals along their length at the bottom of each crossbeam (7).

7. A double-headed gantry crane according to claim 6, characterized in that: The drive trolley (8) includes a frame (801), a geared motor (802), and a wheel set (803); The frame (801) is fixed to the bottom of the crossbeam (7), the wheel set (803) is rotatably connected to the frame (801), and the geared motor (802) is mounted on the frame (801) and its output end is connected to the wheel set (803) in a transmission.

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