A large-span gantry crane girder deflection over-limit detection alarm device

Abstract

A kind of large-span gantry crane girder deflection over-limit detection alarm device, single-point laser transmitter and receiver are respectively installed at the both ends of large-span gantry crane girder, over-limit detection baffle is arranged in the middle of the bottom of large-span gantry crane girder, long waist hole is opened in the middle of over-limit detection baffle, laser beam emitted from single-point laser transmitter is received by receiver after passing through long waist hole;Single-point transmitter and receiver are connected with crane control system by signal transmission cable;Large-span gantry crane girder is supported by a rigid leg and a flexible leg, electrical room is arranged on rigid leg, crane control system is arranged in electrical room;A plurality of cable hangers are arranged on large-span gantry crane girder, rigid leg and flexible leg, signal transmission cable is hung on cable hanger.The utility model can realize detection and alarm function when large-span crane girder deflection over-limit.

Description

Technical Field

[0001] This utility model relates to a detection and alarm device for excessive deflection of the main beam of a large-span gantry crane. Background Technology

[0002] Currently, a large number of large-span gantry cranes are distributed in lifting operations at ports, shipyards, and offshore wind power equipment manufacturing plants in my country. These gantry cranes are characterized by their large span, large lifting capacity, and long service life. The main beam span of these cranes is very large, usually between 100 and 200 meters. After long-term use, the metal structure will often experience fatigue. When lifting heavy objects, the main beam will deflect. If the deflection exceeds the specified limit, it indicates that the gantry crane structure has serious problems and needs to be shut down for maintenance immediately. If maintenance is not taken seriously and the crane is used for a long time, it may cause the main beam structure to collapse, resulting in serious personal injury and equipment accidents.

[0003] Therefore, it is necessary to develop a deflection over-limit detection and alarm device for the main beam of a large-span crane, so as to realize the detection, alarm and recording functions of deflection over-limit under the main beam of a large-span gantry crane. This is of great practical significance in preventing the main beam from collapsing due to fatigue of the main beam metal structure and long-term lifting of heavy objects, which could lead to major personal and equipment accidents. Utility Model Content

[0004] The technical problem to be solved by this utility model is: how to detect and warn of excessive deflection of the main beam of a large-span crane, and to provide an alarm device for detecting excessive deflection of the main beam of a large-span gantry crane.

[0005] To solve the above problems, this utility model is achieved through the following technical solution: A deflection over-limit detection and alarm device for the main beam of a large-span gantry crane includes a main beam of the large-span gantry crane. A single-point laser transmitter and a receiver are respectively installed at both ends of the main beam. An over-limit detection baffle is set in the middle of the bottom of the main beam, with an elongated hole in the middle of the baffle. The height of the elongated hole is within the acceptable deflection range of the main beam. A laser beam emitted from the single-point laser transmitter passes through the elongated hole and is received by the receiver. Both the single-point transmitter and the receiver are connected to the crane control system via signal transmission cables. The main beam of the large-span gantry crane is supported by a rigid leg and a flexible leg. An electrical room is set on the rigid leg, and the crane control system is installed inside the electrical room. Several cable hangers are installed on the main beam, rigid legs, and flexible legs of the large-span gantry crane, and the signal transmission cables are hung on the cable hangers.

[0006] The crane control system includes a PLC controller and a touch screen mounted on it.

[0007] The crane control system is also connected to the audible and visual alarm indicator lights and the CMS management system via signal transmission cables.

[0008] Compared with the prior art, the present invention has the following beneficial effects: The present invention can realize the detection and alarm function when the deflection of the main beam of a large-span crane exceeds the limit, and can also transmit the over-limit alarm signal to the crane's CMS management system for statistical recording, assisting users in the life cycle management of the crane, thereby avoiding major personal and equipment accidents caused by long-term over-limit use, which has important practical significance for improving safe production. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the installation of the alarm device for detecting and preventing excessive deflection of the main beam of a large-span crane. Figure 2 This is a connection diagram of the alarm device for detecting excessive deflection of the main beam of a large-span crane; Figure 3 This is a structural diagram of the over-limit detection baffle. Detailed Implementation

[0010] 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.

[0011] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0012] like Figure 1 , Figure 2 , Figure 3As shown, a deflection over-limit detection and alarm device for the main beam of a large-span gantry crane includes a main beam 1 of the large-span gantry crane. A single-point laser emitter 2 and a receiver 3 are respectively installed at both ends of the main beam 1. An over-limit detection baffle 4 is set in the middle of the bottom of the main beam 1. An elongated waist hole 5 is opened in the middle of the over-limit detection baffle 4. The laser beam emitted from the single-point laser emitter 2 passes through the elongated waist hole 5 and is received by the receiver 3. The single-point emitter 2 and the receiver 3 are both connected to the crane control system 9 through a signal transmission cable 6. The crane control system 9 is also connected to the audible and visual alarm indicator 8 and the CMS management system 10 through a signal transmission cable.

[0013] Furthermore, the crane control system 9 includes a PLC controller and a touch screen mounted on it.

[0014] It should be noted that the main beam 1 of the large-span gantry crane is supported by a rigid leg 11 and a flexible leg 12. An electrical room 13 is set on the rigid leg 11, and the crane control system 9 and CMS management system 10 are set in the electrical room 13.

[0015] Even better, several cable hangers 7 are provided on the main beam 1, rigid legs 11 and flexible legs 12 of the large-span gantry crane, and the signal transmission cable 6 is hung on the cable hangers 7.

[0016] like Figure 3 As shown, an elongated slot 5 is formed in the middle of the over-limit detection baffle 4. The center of the slot 5 is the center through which the laser beam passes. The upper edge of the slot 5 is the lower deflection limit position 51 of the main beam, and the lower edge is the upper deflection limit position 52 of the main beam. That is, the height of the slot 5 is the acceptable deflection range of the main beam 1 of the large-span gantry crane. In this way, the current deflection value of the main beam 1 of the large-span gantry crane can be obtained by receiving the laser beam position information from the receiver 3.

[0017] The working principle of this utility model is as follows: When the downward deflection of the main beam 1 of the large-span gantry crane is within the allowable range, the laser beam emitted by the single-point laser emitter 2 can pass through the elongated hole 5 on the over-limit detection baffle 4 and illuminate the receiver 3. At this time, the single-point laser emitter 2 transmits the normal laser emission signal to the crane control system (PLC + touch screen) 9 and CMS management system 10 through the signal transmission cable 6, and the system operates normally. When the downward deflection of the main beam 1 of the large-span gantry crane exceeds the specified limit, the laser beam emitted by the single-point laser emitter 2 is blocked by the over-limit detection baffle 4, and the laser beam cannot illuminate the receiver 3. The receiver 3 transmits the laser loss signal to the crane control system (PLC + touch screen) 9 and CMS management system 10 through the signal transmission cable 4. It should be noted that the internal judgment logic of the crane control system 9 and CMS management system 10 in receiving the signal from the receiver 3 regarding whether the laser beam has been received is not within the protection scope of this utility model. The crane control system 9 can output signals to the audible and visual alarm indicator 8 to remind and warn management personnel. Simultaneously, it records the over-limit event in the database of the CMS management system 10 for later review by equipment management personnel on the touchscreen and CMS management interface. Upon receiving an alarm signal indicating excessive deflection of the main beam, the operator must stop the machine for maintenance. Frequent occurrences of such alarms must be promptly reported to equipment management personnel for analysis and handling to prevent the collapse of the metal structure due to prolonged over-limit use, which could lead to serious personal injury and equipment accidents.

[0018] This invention enables the detection and alarm function when the deflection of the main beam of a large-span crane exceeds the limit. It can also transmit the over-limit alarm signal to the crane's CMS management system for statistical recording, assisting users in the life cycle management of the crane, thereby avoiding major personal and equipment accidents caused by long-term over-limit use, which has important practical significance for improving safe production.

[0019] The above description is only a preferred embodiment of the present utility model. It should be noted that those skilled in the art can make several changes and improvements without departing from the overall concept of the present utility model, and these should also be considered within the protection scope of the present utility model.

Claims

1. A detection and alarm device for excessive deflection of the main beam of a large-span gantry crane, characterized in that: The system includes a main beam (1) of a large-span gantry crane. A single-point laser emitter (2) and a receiver (3) are installed at both ends of the main beam (1). An over-limit detection baffle (4) is set in the middle of the bottom of the main beam (1). An elongated waist hole (5) is opened in the middle of the over-limit detection baffle (4). The height of the elongated waist hole (5) is within the acceptable deflection range of the main beam (1) of the large-span gantry crane. The laser beam emitted from the single-point laser emitter (2) passes through the elongated waist hole (5) and is received by the receiver (3). The single-point emitter (2) and the receiver (3) are both connected to the crane control system (9) through a signal transmission cable (4). The main beam (1) of the large-span gantry crane is supported by a rigid leg (11) and a flexible leg (12). An electrical room (13) is set on the rigid leg (11), and a crane control system (9) is set in the electrical room (13). Several cable hangers (6) are provided on the main beam (1), rigid legs (11) and flexible legs (12) of the large-span gantry crane, and the signal transmission cable (4) is hung on the cable hangers (6).

2. The alarm device for detecting and activating excessive deflection of the main beam of a large-span gantry crane according to claim 1, characterized in that: The crane control system (9) includes a PLC controller and a touch screen mounted on it.

3. The alarm device for detecting and activating excessive deflection of the main beam of a large-span gantry crane according to claim 2, characterized in that: The crane control system (9) is also connected to the audible and visual alarm indicator lights and the CMS management system via signal transmission cables.

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