Soft protection leveling system for steel wire rope of gantry crane

Abstract

The utility model discloses a steel wire rope soft protection leveling system of a gantry crane. The steel wire rope soft protection leveling system comprises a PLC (Programmable Logic Controller), a lifting frequency converter, an opening and closing frequency converter, a lifting mechanism and an opening and closing mechanism, the PLC reads the pulse number of an incremental encoder I in the lifting frequency converter, and the position of the steel wire rope of the lifting mechanism is obtained through analysis and calculation; the PLC reads the pulse number of an incremental encoder II in the opening and closing frequency converter, and the position of the steel wire rope of the opening and closing mechanism is obtained through analysis and calculation; and the PLC monitors and compares the position difference between the hoisting mechanism steel wire rope and the opening and closing mechanism steel wire rope in real time, and controls the hoisting frequency converter to accelerate and decelerate the hoisting motor or the opening and closing frequency converter to accelerate and decelerate the opening and closing motor in real time. According to the utility model, the automatic leveling protection of the steel wire rope in the operation process is realized, the unbalanced stress caused by overlarge difference of the steel wire rope is avoided, and the working efficiency, the safety and the stability of the gantry crane are improved.

Description

Technical Field

[0001] This utility model relates to the field of crane control technology, specifically to a soft protection and leveling system for wire rope of a gantry crane. Background Technology

[0002] Gantry cranes, as important large-scale loading and unloading equipment, are widely used in ports, docks, and other places. Wire ropes, as a key component of the gantry crane's hoisting and opening / closing mechanisms, directly affect the equipment's working efficiency and safety. With wear and tear during use, external environmental interference, and load changes, prolonged operation can lead to rope length imbalances in the hoisting and opening / closing mechanisms. This results in uneven stress, causing operational instability and, with prolonged use, increasing the risk of wire rope breakage and potential safety accidents. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the existing defects and provide a soft protection leveling system for wire rope of gantry crane, which realizes automatic leveling protection of wire rope during operation, avoids excessive difference in wire rope, and prevents unbalanced force, thereby improving the working efficiency, safety and stability of gantry crane, and can effectively solve the problems in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a soft protection leveling system for wire rope of a gantry crane, comprising a PLC controller, a hoisting frequency converter, an opening and closing frequency converter, a hoisting mechanism, and an opening and closing mechanism; the hoisting mechanism includes a hoisting motor and a hoisting drum, and the opening and closing mechanism includes an opening and closing motor and an opening and closing drum.

[0005] The PLC controller is connected to the hoisting frequency converter and the opening and closing frequency converter via PN communication. The hoisting frequency converter drives the hoisting drum through the hoisting motor frequency conversion, and the opening and closing frequency converter drives the opening and closing drum through the opening and closing motor frequency conversion.

[0006] The hoisting motor has an incremental encoder, which is communicatively connected to the hoisting frequency converter; the switching motor has an incremental encoder, which is communicatively connected to the switching frequency converter.

[0007] The PLC controller reads the pulse count of incremental encoder one in the hoisting frequency converter and calculates the position of the hoisting mechanism wire rope after analysis; the PLC controller reads the pulse count of incremental encoder two in the switching frequency converter and calculates the position of the switching mechanism wire rope after analysis; the PLC controller monitors and compares the position difference between the hoisting mechanism wire rope and the switching mechanism wire rope, as well as the position difference between the rotation of the hoisting drum and the switching drum, in real time, and controls the hoisting frequency converter to accelerate or decelerate the hoisting motor or the switching frequency converter to accelerate or decelerate the switching motor in real time.

[0008] Preferably, a photoelectric switch one is provided on one side of the hoisting drum, and a sensing block corresponding to photoelectric switch one is provided on the end face of the hoisting drum; a photoelectric switch two is provided on one side of the opening and closing drum, and a sensing block corresponding to photoelectric switch two is provided on the end face of the opening and closing drum; the PLC controller collects the signals of photoelectric switch one and photoelectric switch two, and determines whether the position of the hoisting mechanism wire rope and the position of the opening and closing mechanism wire rope are at the same height based on the signals.

[0009] Preferably, the PLC controller is connected to the lifting frequency converter and the switching frequency converter via a switch.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: In normal hook mode, the PLC controller monitors and compares the position difference between the two sets of wire ropes and the position difference of the drum rotation in real time to make a judgment. If there is a position difference between the two sets of data, the motor is accelerated or decelerated accordingly to realize automatic leveling protection of the wire rope during operation, so as to avoid the wire rope from having too large a difference, resulting in unbalanced force. Throughout the lifting process, the above monitoring, calculation and adjustment steps are continuously cycled to ensure that the wire rope always remains balanced. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the system control of this utility model;

[0012] Figure 2 This is a partial structural diagram of the present invention.

[0013] In the diagram: 1 PLC controller, 2 switch, 3 lifting inverter, 4 switching inverter, 5 incremental encoder I, 6 lifting motor, 7 incremental encoder II, 8 switching motor, 9 lifting drum, 10 switching drum, 11 photoelectric switch I, 12 photoelectric switch II. Detailed Implementation

[0014] The present invention can be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right" indicating the orientation or positional relationship, they are only corresponding to the drawings of this application for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation.

[0015] Please see Figure 1-2This utility model provides a technical solution: a soft protection leveling system for wire rope of a gantry crane, including a PLC controller 1, a hoisting frequency converter 3, an opening and closing frequency converter 4, a hoisting mechanism and an opening and closing mechanism; the hoisting mechanism includes a hoisting motor 6 and a hoisting drum 9, and the opening and closing mechanism includes an opening and closing motor 8 and an opening and closing drum 10.

[0016] PLC controller 1 is connected to hoisting inverter 3 and switching inverter 4 via PN communication. Hoisting inverter 3 drives hoisting drum 9 via hoisting motor 6, and switching inverter 4 drives switching drum 10 via switching motor 8.

[0017] The hoisting motor 6 has an incremental encoder 5, which is connected to the hoisting frequency converter 3; the switching motor 8 has an incremental encoder 7, which is connected to the switching frequency converter 4.

[0018] PLC controller 1 reads the pulse count of incremental encoder 5 in hoisting inverter 3 and calculates the position of the hoisting mechanism wire rope; PLC controller 1 reads the pulse count of incremental encoder 7 in switching inverter 4 and calculates the position of the switching mechanism wire rope; PLC controller 1 monitors and compares the position difference between the hoisting mechanism wire rope and the switching mechanism wire rope, as well as the position difference between the hoisting drum 9 and the switching drum 10, and controls hoisting inverter 3 to accelerate or decelerate hoisting motor 6 or switching inverter 4 to accelerate or decelerate switching motor 8 in real time;

[0019] It is understandable that during operation, the hoisting wire rope and the opening / closing wire rope need to move up and down synchronously to achieve the up and down movement of the hook. Subsequently, the opening / closing wire rope moves to achieve the opening and closing of the hook. Therefore, by monitoring the position difference between the hoisting mechanism wire rope and the opening / closing mechanism wire rope, as well as the position difference between the rotation of the hoisting drum 9 and the opening / closing drum 10 in real time, the corresponding hoisting motor 6 or opening / closing motor 8 is accelerated or decelerated to achieve precise leveling of the two sets of wire ropes. This avoids excessive differences in the wire ropes, which would lead to unbalanced force. Throughout the hoisting process, the above monitoring, calculation, and adjustment steps are continuously repeated to ensure that the wire ropes remain balanced at all times.

[0020] Example 2: Unlike Example 1, a photoelectric switch 11 is provided on one side of the hoisting drum 9, and a sensing block corresponding to photoelectric switch 11 is provided on the end face of the hoisting drum 9; a photoelectric switch 22 is provided on one side of the opening and closing drum 10, and a sensing block corresponding to photoelectric switch 22 is provided on the end face of the opening and closing drum 10; the PLC controller 1 collects the signals of photoelectric switch 11 and photoelectric switch 22, and determines whether the position of the hoisting mechanism wire rope and the position of the opening and closing mechanism wire rope are at the same height according to the signals, that is, during the hoisting process, the hoisting drum 9 rotates and the opening and closing drum 10 rotates, records the number of times photoelectric switch 11 senses the corresponding sensing block, records the number of times photoelectric switch 22 senses the corresponding sensing block, and analyzes and judges by comparing the number of times;

[0021] It should be noted that the difference between the time it takes for photoelectric switch 11 to sense one rotation of the lifting drum 9 and the time it takes for photoelectric switch 2 to sense one rotation of the opening and closing drum 10 can also be used to determine whether the two sets of wire ropes are synchronized. In addition, by sensing the position of the drum rotating one revolution through the photoelectric switch, a signal is sent to the PLC controller 1. The controller is calibrated according to the signal and the data of one revolution is refreshed to avoid cumulative errors and increase the accuracy of the data.

[0022] In addition, PLC controller 1 is connected to lifting inverter 3 and switching inverter 4 via switch 2.

[0023] The parts of this utility model not described in detail are prior art. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that this utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and are intended to include all changes that fall within the meaning and scope of equivalents in the content of this utility model.

Claims

1. A flexible protection and leveling system for wire rope of a gantry crane, characterized in that: It includes a PLC controller (1), a lifting frequency converter (3), a switching frequency converter (4), a lifting mechanism, and a switching mechanism; the lifting mechanism includes a lifting motor (6) and a lifting drum (9), and the switching mechanism includes a switching motor (8) and a switching drum (10). The PLC controller (1) is connected to the hoisting frequency converter (3) and the opening and closing frequency converter (4) via PN communication. The hoisting frequency converter (3) drives the hoisting drum (9) via the hoisting motor (6) and the opening and closing frequency converter (4) drives the opening and closing drum (10) via the opening and closing motor (8). The hoisting motor (6) has an incremental encoder (5), which is connected to the hoisting frequency converter (3); the opening and closing motor (8) has an incremental encoder (7), which is connected to the opening and closing frequency converter (4). The PLC controller (1) reads the pulse count of the incremental encoder one (5) in the hoisting frequency converter (3) and obtains the position of the hoisting mechanism wire rope after analysis and calculation; the PLC controller (1) reads the pulse count of the incremental encoder two (7) in the switching frequency converter (4) and obtains the position of the switching mechanism wire rope after analysis and calculation; the PLC controller (1) monitors and compares the position difference between the hoisting mechanism wire rope and the switching mechanism wire rope and the position difference between the rotation of the hoisting drum (9) and the switching drum (10) in real time, and controls the hoisting frequency converter (3) to accelerate or decelerate the hoisting motor (6) or the switching frequency converter (4) to accelerate or decelerate the switching motor (8) in real time.

2. The soft protection and leveling system for wire rope of a gantry crane according to claim 1, characterized in that: A photoelectric switch one (11) is provided on one side of the hoisting drum (9), and a sensing block corresponding to the photoelectric switch one (11) is provided on the end face of the hoisting drum (9). A photoelectric switch two (12) is provided on one side of the opening and closing drum (10), and a sensing block corresponding to the photoelectric switch two (12) is provided on the end face of the opening and closing drum (10). The PLC controller (1) collects the signals of the photoelectric switch one (11) and the photoelectric switch two (12), and determines whether the position of the hoisting mechanism wire rope and the position of the opening and closing mechanism wire rope are at the same height based on the signals.

3. The flexible protection and leveling system for wire rope of a gantry crane according to claim 1, characterized in that: The PLC controller (1) is connected to the lifting frequency converter (3) and the switching frequency converter (4) via the switch (2).

Images