Goods weight grabbing limiting system

Abstract

The invention belongs to the technical field of port hoisting, and particularly relates to a cargo weight grabbing limiting system, which comprises a PLC (Programmable Logic Controller) of which the input end is connected with a touch screen HMI (Human Machine Interface); the support transmission HOLDDRIVE is connected with the output end of the PLC and sends a torque starting signal TORQUEOPEN to control a first motor to work; when the second motor is started, a drive CLOSEDRIVE is closed, a speed set value SPEEDREF from the support transmission HOLDDRIVE is received, and a speed starting signal SPEEDOPEN is sent out to control the second motor to work; and the grab bucket is jointly driven by the first motor and the second motor to work. The problem that goods cannot be lifted due to overload when the grab bucket grabs the goods can be solved, and the grab bucket has good market application prospects.

Description

Technical Field

[0001] The invention belongs to the technical field of port lifting, and in particular relates to a cargo weight grabbing limiting system. Background Art

[0002] At present, when gantry cranes use grab buckets to load and unload bulk cargo, when the automatic grab bucket is grabbing cargo, if the density of the grabbed cargo is high, it is very easy to grab too heavy cargo. When entering the lifting stage, overloading occurs, resulting in the inability to lift the cargo. The operator needs to open the bucket again to release the cargo until the grabbed cargo is below the rated lifting weight. The cargo can then be lifted. This reduces the loading and unloading efficiency on the one hand, and on the other hand, it is difficult for humans to accurately control the weight of the cargo released by opening the bucket, and it is very likely that too much cargo will be released, further reducing the loading and unloading efficiency.

[0003] In order to improve the loading and unloading efficiency of bulk cargoes of port cranes, the present invention provides a cargo weight grabbing limiting system for a portal crane.

[0004] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0005] The object of the present invention is to provide a cargo weight grabbing limiting system to solve the problem that the cargo cannot be lifted due to overloading when the grab bucket grabs the cargo.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] Cargo weight grabbing limit system, including:

[0008] PLC, whose input terminal is connected to the touch screen HMI;

[0009] Supporting transmission HOLD_DRIVE, connected to the output end of the PLC, and sending a torque opening signal TORQUE_OPEN to control the operation of the first motor;

[0010] The closing drive CLOSE_DRIVE receives the speed setting value SPEED_REF from the supporting drive HOLD_DRIVE, and sends a speed opening signal SPEED_OPEN to control the operation of the second motor;

[0011] The grab bucket is driven by the first motor and the second motor.

[0012] Preferably, the touch screen HMI is provided with a button for increasing the amount of cargo to be grabbed and a button for decreasing the amount of cargo to be grabbed, which are used to change the size of the given HOLD_DRIVE torque supported by the system.

[0013] Preferably, a data model supporting transmission torque reference TORQUE_REF is established for initialization when the system is enabled.

[0014] Preferably, the touch screen HMI is provided with a fine-tuning button for controlling the accuracy of the weight of the grabbed goods.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] (1) The cargo weight grabbing limiting system of the present invention can limit the weight of the cargo grabbed by the grab bucket, thereby preventing the problem of overloading and inability to lift.

[0017] (2) In the cargo weight grabbing limiting system of the present invention, the operator can change the given size of the system support transmission torque through the cargo grabbing amount increase button and cargo grabbing amount decrease button on the touch screen HMI, so that the support transmission outputs the corresponding torque, thereby achieving the purpose of limiting the grab bucket's digging depth, thereby limiting the cargo grabbing weight.

[0018] (3) The cargo weight grabbing limit system of the present invention can be manually fine-tuned through the touch screen HMI. The finer the fine-tuning value, the higher the accuracy of limiting the grabbing cargo weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a system structure diagram of the present invention;

[0020] Figure 2 The HMI system does not enable the screen image;

[0021] Figure 3 This is the HMI system activation screen. DETAILED DESCRIPTION

[0022] The following is a clear and complete description of the technical solution of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by technicians in this field without creative work are within the scope of protection of the present invention.

[0023] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention 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 cannot be understood as a limitation on the invention.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] Refer to the attached Figure 1-3 , cargo weight grabbing limit system, including:

[0026] PLC, whose input terminal is connected to the touch screen HMI;

[0027] Supporting transmission HOLD_DRIVE, connected to the output end of the PLC, and sending a torque opening signal TORQUE_OPEN to control the operation of the first motor;

[0028] The closing drive CLOSE_DRIVE receives the speed setting value SPEED_REF from the supporting drive HOLD_DRIVE, and sends a speed opening signal SPEED_OPEN to control the operation of the second motor;

[0029] The grab bucket is driven by the first motor and the second motor together; during the grab bucket closing process, the transmission HOLD_DRIVE is supported to switch from speed control mode to torque control mode.

[0030] In this embodiment, the touch screen HMI is provided with a button for increasing the amount of cargo to be grabbed and a button for decreasing the amount of cargo to be grabbed, which are used to change the size of the given HOLD_DRIVE torque supported by the system.

[0031] Before loading and unloading, the operator can use the touch screen HMI next to the cab console to easily enable or disable the system at any time. After enabling the system, the operator can use the touch screen HMI's cargo grabbing volume increment button and cargo grabbing volume decrement button to change the size of the system's support transmission HOLD_DRIVE torque setting, so that the support transmission outputs the corresponding torque, achieving the purpose of limiting the grab bucket's deep digging, thereby limiting the grabbing of cargo weight. The system establishes a support transmission torque setting TORQUE_REF data model, which can be initialized when the system is enabled.

[0032] There is also a fine-tuning button on the touch screen HMI, which can be used for manual fine-tuning. The finer the fine-tuning value, the higher the accuracy of limiting the weight of the grabbed cargo. The maximum value can lift the grab bucket and the cargo grab weight is 0T.

[0033] The cargo weight grabbing limiting system of the present invention is used for a gantry crane and can solve the problem of overloading when the grab bucket grabs cargo, resulting in the inability to lift the cargo. It is beneficial to improving the loading and unloading efficiency of bulk cargo of port cranes, is very practical, and has good market application prospects.

[0034] The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. The scope of the present invention is intended to be limited by the claims and their equivalents.

Claims

1. Cargo weight grabbing limiting system, characterized in that: include: PLC, whose input terminal is connected to the touch screen HMI; Supporting transmission HOLD_DRIVE, connected to the output end of the PLC, and sending a torque opening signal TORQUE_OPEN to control the operation of the first motor; The closing drive CLOSE_DRIVE receives the speed setting value SPEED_REF from the supporting drive HOLD_DRIVE, and sends a speed opening signal SPEED_OPEN to control the operation of the second motor; The grab bucket is driven by the first motor and the second motor.

2. The cargo weight grabbing limiting system according to claim 1, characterized in that: The touch screen HMI is provided with a button for increasing the amount of cargo being grabbed and a button for decreasing the amount of cargo being grabbed, which are used to change the size of the given HOLD_DRIVE torque of the supporting transmission.

3. The cargo weight grabbing limiting system according to claim 1, characterized in that: A data model supporting transmission torque reference TORQUE_REF is established for initialization when the system is enabled.

4. The cargo weight grabbing limiting system according to claim 1, characterized in that: The touch screen HMI is provided with a fine-tuning button for controlling the accuracy of the weight of the grabbed goods.

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