Operation limiting structure applied to portal crane

Abstract

The utility model provides an operation limiting structure applied to a portal crane, which relates to the technical field of height limiting of hoisting equipment and comprises a buffer plate, a steel wire rope connected with winding equipment on a walking trolley and a U-shaped fixing frame mounted at the bottom of the walking trolley, and guide rollers are symmetrically arranged between the buffer plate and the U-shaped fixing frame. One end of the guide roller is connected with the U-shaped fixing frame, the guide roller is in sliding fit with the buffer plate, and the other end of the guide roller is provided with a limiting block; the device can accurately detect a position signal before the lifting hook is about to reach the limit height in the lifting and resetting process of the lifting hook of the overhead and gantry crane and accurately feed back the position signal to rolling equipment to control the rolling equipment to stop working without being interfered by surrounding external factors, and meanwhile, a detection piece can be effectively buffered and protected; therefore, the failure rate of the detection piece is greatly reduced, the detection result after use is more accurate, and the height limiting effect and the operation safety in the lifting and resetting process of the lifting hook of the overhead and portal crane are further improved.

Description

Technical Field

[0001] This utility model relates to the field of height limiting technology for lifting equipment, and more specifically, to a running limiting structure applied to a bridge crane. Background Technology

[0002] The traveling mechanism of a bridge (gantry) crane runs longitudinally along tracks laid on both sides, making full use of the space under the crane to lift materials. It is not obstructed by ground equipment, has good applicability, and low site requirements. It is widely used in factories, construction sites, freight stations, docks, and other operating locations, and is the most widely used and numerous type of lifting machinery.

[0003] Existing bridge cranes need to be equipped with extreme height limiting devices to avoid the safety hazard of "hook going up and rope breaking and falling to the ground".

[0004] Announcement No. CN214570206U proposes a limit device for the hoisting mechanism of a bridge crane. This device uses an infrared photoelectric switch as the limit device. By judging the distance between the infrared photoelectric switch and the hook assembly, it activates the electrical contacts inside the crane, cuts off the hook lifting control circuit, protects the hook to stop safely, and prevents further lifting. It can effectively prevent safety accidents caused by the failure of traditional crane lifting limit switches. However, the non-contact detection method is easily affected by the surrounding environmental factors, which leads to unstable detection accuracy and easy deviation. At the same time, the dust accumulation on the reflector surface can also interfere with the detection accuracy. Therefore, the effect of limiting the lifting height of the bridge crane hook needs to be further improved. Utility Model Content

[0005] The purpose of this invention is to solve the problems mentioned in the background art and to propose a running limit structure for use on gantry cranes.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] The running limit structure applied to a bridge gantry crane includes a buffer plate, a wire rope connected to a winding device on a traveling trolley, and a U-shaped fixing frame installed at the bottom of the traveling trolley. Guide rollers are symmetrically arranged between the buffer plate and the U-shaped fixing frame. One end of the guide roller is connected to the U-shaped fixing frame, and the guide roller slides in cooperation with the buffer plate. The other end of the guide roller is provided with a limit block. A spring is sleeved on the surface of the guide roller. Two through holes of the same size and vertically connected are opened in the center of the buffer plate and the U-shaped fixing frame, respectively. The wire rope passes through the through holes on the buffer plate and the U-shaped fixing frame in sequence and is connected to an anti-detachment hook. A pressure sensor that cooperates with the anti-detachment hook is provided at the bottom of the buffer plate. The pressure sensor and the winding device are electrically connected to the controller.

[0008] This device can accurately detect the position signal of the hook before it reaches its limit height during the lifting and resetting process of the gantry crane hook and accurately feed it back to the winding equipment to control its shutdown. It is not affected by external factors and can effectively buffer and protect the detection component, thereby significantly reducing the failure rate of the detection component and making the detection results more accurate. The height limiting effect and operational safety of the gantry crane hook lifting and resetting process are further improved.

[0009] Furthermore, several rings of ball bearings are arranged circumferentially along the height direction inside the through hole.

[0010] The above solution allows the wire rope to come into contact with the ball bearings as it rises along the through hole, thus significantly reducing wear.

[0011] Furthermore, the traveling trolley is symmetrically equipped with multi-stage telescopic components, which are connected to a U-shaped fixing frame.

[0012] The above solution uses multi-stage telescopic components to lower the device to ground level for easy operation when maintenance or replacement of components is required, while reducing the safety hazards of personnel climbing to heights.

[0013] Furthermore, the end of the guide roller away from the limiting block is provided with an external thread and is connected to the internal thread of the U-shaped fixing frame.

[0014] The above solution makes it easier to replace the spring to prevent it from failing after long-term use. When replacing it, first disconnect the wire rope from the anti-detachment hook, then rotate the guide roller to disengage it from the U-shaped fixing frame, then remove the buffer plate and guide roller together, and finally replace the spring and reinstall it. The operation is quick and easy.

[0015] Furthermore, the anti-detachment hook is provided with a contact plate with a flat surface, which cooperates with the pressure sensor.

[0016] The above solution, by designing a large-sized flat contact plate at the top of the anti-detachment hook, allows the pressure sensor to receive force more comprehensively and evenly, further improving the accuracy of detection.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] Compared to existing technologies, this device can accurately detect the position signal of the hook before it reaches its limit height during the lifting and resetting process of the gantry crane hook and accurately feed it back to the winding equipment to control its shutdown. It is not affected by external factors and can effectively buffer and protect the detection component, thereby significantly reducing the failure rate of the detection component and making the detection results more accurate. The height limiting effect and operational safety of the gantry crane hook lifting and resetting process are further improved. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a diagram illustrating the installation of ball bearings.

[0021] Figure 3 for Figure 1 Enlarged view of section A (labeled A);

[0022] Figure label:

[0023] 1. U-shaped fixing frame; 2. Buffer plate; 21. Through hole; 22. Ball bearing; 3. Guide roller; 31. Limiting block; 4. Spring; 5. Steel wire rope; 6. Anti-detachment hook; 7. Pressure sensor. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model. The present utility model will be further described with reference to the accompanying drawings and embodiments:

[0025] like Figure 1As shown in the figure, the running limit structure applied to the bridge gantry crane includes a buffer plate 2, a wire rope 5 connected to the winding device on the traveling trolley, and a U-shaped fixing frame 1 installed at the bottom of the traveling trolley. Guide rollers 3 are symmetrically arranged between the buffer plate 2 and the U-shaped fixing frame 1. One end of the guide roller 3 is connected to the U-shaped fixing frame 1. The guide roller 3 slides with the buffer plate 2, and the other end of the guide roller 3 passes through the buffer plate 2 and is provided with a limit block 31. A spring 4 is sleeved on the surface of the guide roller 3. The center of the buffer plate 2 and the U-shaped fixing frame 1 are respectively provided with two through holes 21 of the same size, which are vertically opposite and connected. The wire rope 5 passes through the through holes 21 on the buffer plate 2 and the U-shaped fixing frame 1 in sequence and is connected to an anti-detachment hook 6. A pressure sensor 7 that cooperates with the anti-detachment hook 6 is provided at the bottom of the buffer plate 2. The pressure sensor 7 and the winding device are electrically connected to the controller. The controller is not shown in the figure. The traveling trolley and the winding device are existing technologies and their working principles are not described.

[0026] Further refinements of the embodiments of this utility model, such as... Figure 2 As shown, several rings of balls 22 are arranged circumferentially along the height direction inside the through hole 21.

[0027] The working process of this utility model is as follows:

[0028] After the gantry crane completes its lifting operation, the hook connected to the traveling trolley's winding device needs to be reset. During the reset process, when the top of the anti-detachment hook 6 contacts the pressure sensor 7, the pressure sensor 7 receives a signal indicating a change in value (initially, the value is 0 when not in contact). This signal is then fed back to the controller, which in turn stops the drive assembly of the winding device to halt the lifting. At this point, the hook is close to its maximum lifting height but has not yet reached it. However, due to inertia, the drive assembly will not stop immediately, and the anti-detachment hook 6 will continue to move upward a short distance (this distance is less than the initial distance before lifting). When the height difference between the buffer plate 2 and the limit height is raised, the anti-detachment hook 6 will apply pressure to the buffer plate 2, and the spring 4 will be compressed. At the same time, one end of the guide roller 3 with the limit block 31 slides downward. This design can protect the pressure sensor 7 and avoid the safety hazards of the hook going up and the rope breaking and falling to the ground. Finally, the anti-detachment hook 6 stops below the limit height, and the safety height limit of the anti-detachment hook 6 is reset. When it is used again, the anti-detachment hook 6 can be lowered again. During the process of the wire rope 5 rising along the through hole 21, it will come into contact with the ball bearing 22, which will greatly reduce wear.

[0029] Compared to existing technologies, this device can accurately detect the position signal of the hook before it reaches its limit height during the lifting and resetting process of the gantry crane hook and accurately feed it back to the winding equipment to control its shutdown. It is not affected by external factors and can effectively buffer and protect the detection component, thereby significantly reducing the failure rate of the detection component and making the detection results more accurate. The height limiting effect and operational safety of the gantry crane hook lifting and resetting process are further improved.

[0030] In some embodiments, the traveling trolley is symmetrically equipped with multi-stage telescopic components. Specifically, the multi-stage telescopic components are either multi-stage cylinders or multi-stage telescopic rods. The multi-stage telescopic components are connected to a U-shaped fixing frame 1, which is not shown in the figure in this embodiment. In this embodiment, the multi-stage telescopic components can be lowered to ground level in a timely manner when it is necessary to maintain or replace the parts in this device for convenient operation. At the same time, it can reduce the safety hazards of personnel climbing to heights. It should be noted that during the process of lowering the anti-detachment hook 6, the multi-stage telescopic components and the winding equipment maintain a synchronous and same frequency working state (i.e., the two are in a relatively static motion).

[0031] In a further optimization of the above embodiment, the end of the guide roller 3 away from the limiting block 31 is provided with an external thread and is connected to the internal thread of the U-shaped fixing frame 1. This embodiment is not shown in the figure. This embodiment can make it easier to replace the spring 4 to avoid the failure of the spring 4. When replacing, first disconnect the wire rope 5 from the anti-detachment hook 6, then rotate the guide roller 3 to make it detach from the U-shaped fixing frame 1, then remove the buffer plate 2 and the guide roller 3 together, and finally replace the spring 4 with a second sleeve. The operation is quick.

[0032] In other embodiments, the anti-detachment hook 6 is provided with a contact plate with a flat surface, which cooperates with the pressure sensor 7. The contact plate is not shown in the figure. In this embodiment, by designing a large-sized flat contact plate on the top of the anti-detachment hook 6, the pressure sensor 7 can be subjected to force more comprehensively and evenly, which further improves the accuracy of detection.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The descriptions of the above embodiments and specifications are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A running limit structure applied to a bridge portal crane, characterized in that, The utility model relates to a buffer plate (2), steel wire rope (5) connected with winding equipment on walking trolley and U type fixed frame (1) installed at walking trolley bottom are included, and symmetrically set up guide roller (3) between buffer plate (2) and U type fixed frame (1), one end of guide roller (3) is connected with U type fixed frame (1), and guide roller (3) is slidably fitted with buffer plate (2) and the other end of guide roller (3) is provided with limit block (31), the surface of guide roller (3) is equipped with spring (4), and the center of buffer plate (2) and U type fixed frame (1) is respectively provided with two through holes (21) of identical size and vertical intercommunication, steel wire rope (5) passes through the through hole (21) on buffer plate (2) and U type fixed frame (1) in proper order and is connected with anti -drop lifting hook (6), and the bottom of buffer plate (2) is provided with pressure sensor (7) matched with anti -drop lifting hook (6), and pressure sensor (7) and winding equipment are electrically connected with controller.

2. The operation limiting structure applied to a bridge portal crane according to claim 1, characterized in that, The through hole (21) is circumferentially provided with several circles of balls (22) along the height direction.

3. The operation limiting structure applied to a bridge portal crane according to claim 1, characterized in that, The walking trolley is symmetrically provided with a plurality of telescopic assemblies, and the telescopic assemblies are connected with the U-shaped fixed frame (1).

4. The operation limiting structure applied to a bridge portal crane according to claim 1, characterized in that, The guide roller (3) is provided with an external thread at one end away from the limit block (31) and is internally threadedly connected with the U-shaped fixed frame (1).

5. The operation limiting structure applied to a bridge portal crane according to claim 1, characterized in that, The anti-drop lifting hook (6) is provided with a contact plate with a flat surface, and the contact plate is matched with the pressure sensor (7).

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