Portal crane

Abstract

The utility model discloses a gantry crane, which relates to the field of gantry cranes, and comprises a rotating base, a weight box is connected to the rear end of the rotating base, a mounting frame is connected to a bottom plate of the weight box, a rotating roller is rotatably connected in the mounting frame, and the rotating roller is rotatably connected to the bottom plate of the weight box. A balancing weight is arranged in the weight box, a threaded hole is formed in the balancing weight, and a rotating head is arranged in the weight box. The servo motor is started, the balancing weight moves in the weight box through the worm, the turbine and the threaded rod, according to the lever principle, it can be known that the farther the balancing weight is away from the rotating base, the larger the downward pressure provided by the balancing weight is, the magnitude of the downward pressure provided by the balancing weight can be changed by changing the position of the balancing weight, and therefore the rotating base can be effectively assisted to keep balance; the problems that according to an existing gantry crane, the position of a balancing weight cannot be adjusted, and downward pressure provided by the balancing weight is difficult to change are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of portal cranes, and particularly relates to a portal crane. Background Art

[0002] A portal crane is a boom crane whose bridge is supported on a ground track or foundation through two side legs. It is usually installed on a gantry base that travels along a ground track and belongs to a full-rotation boom crane. It is widely used in the mechanized loading and unloading of goods in ports and docks, the construction and installation of ships in shipyards, and the dam construction projects at large hydropower station sites. It is of great significance for reducing heavy physical labor, improving the operating conditions of workers, and increasing labor productivity.

[0003] When a portal crane is in operation, it adjusts the overall balance of the crane by changing the angle of the boom. At the same time, a counterweight block is provided at the rear end of the rotating base to provide a downward pressure to assist in balancing. This is a passive balancing method. However, for existing portal cranes, the counterweight block is fixedly arranged and its position cannot be adjusted, so the downward pressure it provides is always the same. When the angle of the boom is restricted and difficult to adjust, if the counterweight of the counterweight block can be adjusted to actively balance, it will greatly facilitate the use of the crane and enable the crane to be applied to more usage scenarios.

[0004] To solve this technical problem, the utility model proposes a portal crane. Content of the Utility Model

[0005] The main purpose of the utility model is to provide a portal crane, which can effectively solve the problems mentioned in the background art.

[0006] To achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0007] A portal crane includes a rotating base. A counterweight box is connected to the rear end of the rotating base. An installation frame is connected to the bottom plate of the counterweight box. A rotating roller is rotatably connected inside the installation frame. Counterweight blocks are arranged inside the counterweight box. Threaded holes are formed inside the counterweight blocks. A rotating head is arranged inside the counterweight box. A threaded rod is arranged at the side end of the rotating head. A turbine is arranged at the side end of the threaded rod. A servo motor is connected to the upper end of the counterweight box. The driving end of the servo motor is connected to a worm. A protective cover is connected to the side end of the counterweight box.

[0008] Preferably, an operation room is arranged at the upper end of the rotating base. Reinforcing rods are arranged at the lower end of the counterweight box. The counterweight blocks are located above the installation frame. The lower ends of the counterweight blocks are in rolling connection with the rotating rollers. The threaded rod is rotatably connected inside the counterweight box and is in threaded connection with the threaded holes.

[0009] Preferably, the turbine is located at the outer end of the counterweight box. The servo motor, the worm, and the turbine are all located inside the protective cover. The worm is rotatably connected inside the protective cover, and the worm meshes with the turbine.

[0010] Preferably, a connection hole is formed in the counterweight block. The connection holes are located on both sides of the threaded hole. A track rod is connected inside the counterweight box. The track rods are located on both sides of the threaded rod. The track rod is slidably connected in the connection hole.

[0011] Preferably, a laser rangefinder is connected inside the counterweight box. The laser rangefinder projects a laser beam onto the side of the counterweight block. A front detector and a rear detector are arranged inside the counterweight box. The front detector and the rear detector are respectively located at both ends of the counterweight box.

[0012] Preferably, the front detector and the rear detector have the same structure, including a fixing plate. A button is connected inside the fixing plate. The button is respectively connected to the operation room and the servo motor. A spring is connected to the side end of the fixing plate. The button is located inside the spring.

[0013] Preferably, a moving plate is connected to the side end of the spring. The outer end of the moving plate can contact the counterweight block. The inner side of the moving plate can contact the button. A guide rod is connected to the inner side of the moving plate. The guide rod is slidably connected inside the fixing plate.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] In the utility model, by arranging a bolt rod and a rotating roller inside the counterweight box, the weight of the counterweight block acts on the rotating roller, thereby starting the servo motor, which will drive the worm at its driving end to rotate. The rotation of the worm acts on the turbine, which will drive the threaded rod to rotate. The rotation of the threaded rod acts on the threaded hole of the counterweight block, which will enable the counterweight block to move inside the counterweight box. According to the lever principle, the farther the counterweight block is from the rotating base, the greater the downward pressure it provides. Thus, by changing the position of the counterweight block, the magnitude of the downward pressure it provides can be changed, so as to effectively assist the rotating base to keep it balanced, and solve the problem that in the existing portal crane, the position of the counterweight block cannot be adjusted and the downward pressure it provides is difficult to change.

[0016] In the utility model, by arranging a front detector and a rear detector, when the counterweight block moves to the limit at the front end or the rear end of the counterweight box, at this time the counterweight block will be able to push the moving plate to move, the moving plate will compress the spring and act on the button. At this time, the servo motor will stop running and simultaneously transmit information to the operation room, avoiding the situation that the counterweight block moves excessively and squeezes and damages the counterweight box. Description of the Drawings

[0017] Figure 1 It is a schematic diagram of the overall structure of a portal crane of the utility model;

[0018] Figure 2 This is a schematic diagram of the internal structure of a counterweight box of a portal crane of the present utility model;

[0019] Figure 3 This is a schematic diagram of the rotating roller structure of a portal crane of the present utility model;

[0020] Figure 4 This is a schematic diagram of the counterweight structure of a portal crane of the present utility model;

[0021] Figure 5 This is a schematic diagram of the upper end structure of a counterweight box of a portal crane of the present utility model;

[0022] Figure 6 This is a schematic diagram of the button structure of a portal crane of the present utility model.

[0023] In the figure: 1, rotating base; 2, counterweight box; 3, mounting frame; 4, rotating roller; 5, counterweight; 6, threaded hole; 7, rotating head; 8, threaded rod; 9, turbine; 10, servo motor; 11, worm; 12, protective cover; 13, reinforcing rod; 14, connecting hole; 15, track rod; 16, laser rangefinder; 17, front detector; 18, rear detector; 19, fixing plate; 20, button; 21, spring; 22, moving plate; 23, guide rod. Specific embodiments

[0024] In order to make the technical means, creative features, achieved purposes and effects of the present utility model easy to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0025] As Figures 1-6 shown, a portal crane includes a rotating base 1, an operating room is arranged at the upper end of the rotating base 1, the rotating base 1 can rotate, the operating room is used to control the whole device, the rear end of the rotating base 1 is connected with a counterweight box 2, a reinforcing rod 13 is arranged at the lower end of the counterweight box 2, and the reinforcing rod 13 is used to support the counterweight box 2 and reinforce it.

[0026] A mounting frame 3 is connected to the bottom plate of the counterweight box 2, a rotating roller 4 is rotatably connected in the mounting frame 3, the mounting frame 3 is used to support the rotating roller 4, a counterweight 5 is arranged in the counterweight box 2, the counterweight 5 is located above the mounting frame 3, the lower end of the counterweight 5 is in rolling connection with the rotating roller 4, the rotating roller 4 supports the counterweight 5, and the weight of the counterweight 5 acts on the rotating roller 4, which can facilitate the movement of the counterweight 5. A laser rangefinder 16 is connected in the counterweight box 2, the laser rangefinder 16 projects a laser beam onto the side end of the counterweight 5, and the laser rangefinder 16 is used to determine the position of the counterweight 5. According to the lever principle, the downward pressure generated by the counterweight 5 at different positions can be calculated.

[0027] A threaded hole 6 is provided in the counterweight block 5, a rotating head 7 is arranged in the counterweight box 2, a threaded rod 8 is arranged at the side end of the rotating head 7, the threaded rod 8 is rotatably connected in the counterweight box 2, and the rotating head 7 is used to support the threaded rod 8, enabling the threaded rod 8 to rotate smoothly. The threaded rod 8 is threadedly connected in the threaded hole 6. A connecting hole 14 is provided in the counterweight block 5, and the connecting hole 14 is located on both sides of the threaded hole 6. A track rod 15 is connected in the counterweight box 2, and the track rod 15 is located on both sides of the threaded rod 8. The track rod 15 is slidably connected in the connecting hole 14. The track rod 15 is used to restrict the counterweight block 5 so that it can only move smoothly along the direction of the track rod 15 and is difficult to tilt or shake, thereby ensuring that the device can remain stable when the counterweight block 5 moves.

[0028] A turbine 9 is arranged at the side end of the threaded rod 8, a servo motor 10 is connected to the upper end of the counterweight box 2, a worm 11 is connected to the driving end of the servo motor 10, a protective cover 12 is connected to the side end of the counterweight box 2, the turbine 9 is located outside the counterweight box 2, and the servo motor 10, the worm 11, and the turbine 9 are all located inside the protective cover 12. The protective cover 12 is used to protect the equipment inside it. The worm 11 is rotatably connected in the protective cover 12, and the worm 11 meshes with the turbine 9. Thus, starting the servo motor 10 will drive the worm 11 to rotate. The rotation of the worm 11 acts on the turbine 9, enabling the turbine 9 to drive the threaded rod 8 to rotate. In this way, the threaded rod 8 acts on the counterweight block 5, and the counterweight block 5 can move smoothly in the counterweight box 2 under the action of the threaded rod 8 and the track rod 15. Moreover, the turbine 9 and the worm 11 can achieve self-locking, so that the position of the counterweight block 5 can be locked.

[0029] A front detector 17 and a rear detector 18 are arranged in the counterweight box 2. The front detector 17 and the rear detector 18 are respectively located at both ends of the counterweight box 2. The front detector 17 and the rear detector 18 have the same structure, including a fixing plate 19. A button 20 is connected in the fixing plate 19, and the button 20 is respectively connected to the operation room and the servo motor 10. Thus, when the button 20 is pressed, it will be able to stop the servo motor 10 and transmit this message to the operation room. A spring 21 is connected to the side end of the fixing plate 19, the button 20 is located inside the spring 21, a moving plate 22 is connected to the side end of the spring 21, the outer end of the moving plate 22 can contact the counterweight block 5, the inner side of the moving plate 22 can contact the button 20, and a guide rod 23 is connected to the inner side of the moving plate 22. The guide rod 23 is slidably connected in the fixing plate 19, so that the moving plate 22 can move smoothly.

[0030] The foregoing has shown and described the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above-mentioned embodiments, and what is described in the above-mentioned embodiments and the specification only illustrates the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A portal crane, comprising a slewing base (1), characterized in that: A counterweight box (2) is connected to the rear end of the rotating base (1). An installation frame (3) is connected to the bottom plate of the counterweight box (2). A rotating roller (4) is rotatably connected inside the installation frame (3). A counterweight block (5) is arranged inside the counterweight box (2). A threaded hole (6) is formed inside the counterweight block (5). A rotating head (7) is arranged inside the counterweight box (2). A threaded rod (8) is arranged at the side end of the rotating head (7). A turbine (9) is arranged at the side end of the threaded rod (8). A servo motor (10) is connected to the upper end of the counterweight box (2). The driving end of the servo motor (10) is connected to a worm (11). A protective cover (12) is connected to the side end of the counterweight box (2).

2. The portal crane according to claim 1, characterized in that: An operation room is arranged at the upper end of the rotating base (1). A reinforcing rod (13) is arranged at the lower end of the counterweight box (2). The counterweight block (5) is located at the upper end of the installation frame (3). The lower end of the counterweight block (5) is in rolling connection with the rotating roller (4). The threaded rod (8) is rotatably connected inside the counterweight box (2). The threaded rod (8) is in threaded connection with the threaded hole (6).

3. A portal crane according to claim 1, characterized in that: The turbine (9) is located at the outer end of the counterweight box (2). The servo motor (10), the worm (11), and the turbine (9) are all located inside the protective cover (12). The worm (11) is rotatably connected inside the protective cover (12). The worm (11) is meshed with the turbine (9).

4. The portal crane according to claim 1, characterized in that: A connecting hole (14) is formed inside the counterweight block (5). The connecting hole (14) is located on both sides of the threaded hole (6). A track rod (15) is connected inside the counterweight box (2). The track rod (15) is located on both sides of the threaded rod (8). The track rod (15) is slidably connected inside the connecting hole (14).

5. The portal crane according to claim 1, characterized in that: A laser rangefinder (16) is connected inside the counterweight box (2). The laser rangefinder (16) projects laser light onto the side end of the counterweight block (5). A front detector (17) and a rear detector (18) are arranged inside the counterweight box (2). The front detector (17) and the rear detector (18) are respectively located at both ends of the counterweight box (2).

6. The portal crane according to claim 5, characterized in that: The front detector (17) and the rear detector (18) have the same structure, including a fixing plate (19). A button (20) is connected inside the fixing plate (19). The button (20) is respectively connected to the operation room and the servo motor (10). A spring (21) is connected to the side end of the fixing plate (19). The button (20) is located inside the spring (21).

7. A portal crane according to claim 6, characterized in that: A moving plate (22) is connected to the side end of the spring (21). The outer end of the moving plate (22) can contact the counterweight block (5). The inner side of the moving plate (22) can contact the button (20). A guide rod (23) is connected to the inner side of the moving plate (22). The guide rod (23) is slidably connected inside the fixing plate (19).

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