A travel limit device for a molten metal hoisting crane and its application

Abstract

The present invention belongs to the technical field of steelmaking equipment, and discloses a travel limit device and application of a molten metal lifting crane. The device includes a PLC control system, a weighing system, a travel limit system, and a crane system. The travel limit device of the invention realizes the automation and precision of the crane movement through the PLC control system, and effectively solves the problem of low efficiency caused by the manual adjustment and movement of the traditional crane. Automated control reduces manual intervention, speeds up the production process, and avoids multiple alignments and readjustments caused by over-travel movement, thereby significantly improving the overall production efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of steelmaking equipment, and in particular relates to a travel limiting device for a molten metal hoisting crane and an application thereof. Background Art

[0002] In the process of steelmaking molten metal, different equipment is located in different positions of the crane. Therefore, in order to meet the operation of equipment between different areas in the factory, the movement speed is often set faster. Overtravel often occurs during movement, which makes it difficult to meet the increasingly precise production needs.

[0003] In the traditional production process, the crane movement and adjustment are all done by moving little by little, and due to its fast movement speed, it takes a long time to adjust and is difficult to align. One alignment takes a long time, and production requires multiple alignments. This method greatly affects production efficiency.

[0004] During the process of hoisting a container filled with molten metal, the movement may sometimes cause it to exceed the travel range and enter the working area of ​​other equipment. Due to the over-travel movement into the working area of ​​other equipment, the hoisted container may collide with other equipment.

[0005] Therefore, there is an urgent need for a travel limit device for the crane to avoid the problem of alignment difficulties and impact on other working areas caused by over-travel movement and excessive movement speed, improve production efficiency, ensure the safe and stable operation of the crane within the specified area, and protect the lives of operators. Summary of the invention

[0006] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a travel limit device for a molten metal lifting crane and its application.

[0007] The technical solution adopted by the present invention to solve its technical problem is:

[0008] A travel limit device for a molten metal lifting crane, the device comprising a PLC control system, a weighing system, a travel limit system, and a crane system, wherein the input end of the PLC control system is connected to the weighing system and the travel limit system, the PLC control system can receive signals from the weighing system and the travel limit system, the input end of the crane system is connected to the output end of the PLC control system, the crane system can be switched on and off by the PLC control system, the weighing system is connected to the crane, and the weighing system can detect the weight of a load hung by the crane and output a corresponding signal.

[0009] Further, the PLC control system includes a detection unit and a controller, the weighing system includes a weighing unit and a gravity sensor, the travel limit system includes a limit contactor and a position sensor, and the crane system includes a crane direction contactor, a power unit, a crane and a crane hook;

[0010] The detection unit is connected to the controller, and the detection unit can detect whether the equipment of the controller is operating normally. The weighing unit is connected to the gravity sensor, and the weighing unit can weigh the weight hoisted by the crane and transmit it to the gravity sensor. The gravity sensor outputs a gravity signal. The limit contactor is connected to the crane direction contactor, and the position sensor is connected to the crane. The limit contactor is connected to the position sensor through the controller, and can detect whether the operating position of the crane exceeds the limit position. The controller is connected to the crane system, and the controller can control the direction movement operation of the crane's trolley. The crane direction contactor, the crane and the crane hook are connected in sequence. The crane direction contactor is connected to the controller, and the direction and movement amount of the crane can be controlled by the controller. The crane hook is connected to the weighing unit, and the weighing unit can weigh the weight hoisted by the crane hook. The power unit, the controller and the crane are connected in sequence, and the controller can control the start and stop of the crane through the power unit.

[0011] The method for using the travel limit device of the molten metal lifting crane as mentioned above has the following steps:

[0012] (1) Start the PLC control system, and control the position sensor and gravity sensor to start operation through the PLC control system;

[0013] (2) The detection unit performs hardware detection on the PLC control system to check whether the controller hardware status is intact. If it is intact, it proceeds to the next step. Otherwise, it issues a device alarm to remind the staff that the equipment is damaged and needs repair;

[0014] (3) After the detection is normal, the power unit is turned on and the equipment starts running. Then, the subsequent operation is carried out according to the operator's operation selection. If manual operation is selected, the program skips the movement instruction and the crane moves according to the operator's operation. If automatic operation is selected, the work area point is moved according to the program setting;

[0015] (4) When the crane lifts an object, the weighing unit transmits data to the gravity sensor;

[0016] (5) If the value of the gravity sensor reaches the set threshold, the limit program is started, and the controller will make a judgment based on the data of the position sensor. When the value of the position sensor reaches the limit value, the limit contactor closes, the crane system is disconnected, the crane stops moving and an alarm is sounded;

[0017] (6) Press the stop button of the controller, the power unit is turned off, and then the position sensor and gravity sensor are turned off. The detection unit re-detects the hardware of the PLC control system to check whether the hardware status of the controller is intact. If it is intact, the control system stops running. Otherwise, the equipment alarm is triggered to remind the staff that the equipment is damaged and needs repair.

[0018] Furthermore, the travel limit system also includes an over-travel limit contact system, which includes a crane limit armature, a section limit iron core and an over-travel alarm light. The section limit iron cores are provided in multiple numbers and are distributed beside the crane track at the junction of workshops in different sections. The crane limit armature is provided on the crane side panel on the track side with the section limit iron core. The output end of the section limit iron core is connected to the input end of the crane limit armature, the output end of the crane limit armature is connected to the input end of the controller, the output end of the over-travel alarm light is connected to the input end of the section limit iron core, the input end of the over-travel alarm light is connected to the output end of the controller, and the crane limit armature is connected to the input end of the controller.

[0019] Preferably, the working steps of the overtravel limit contact circuit are as follows:

[0020] According to the limit value set by the control system, the section limit iron core outside the section where the set threshold is located is energized. If the crane travel limit contact system fails and moves over the travel or the staff makes an operating error, when the armature on the crane side panel passes through the section limit iron core, the crane limit armature and the section limit iron core are fitted and connected due to the electromagnetic effect. After the controller receives the electrical signal from the section limit iron core, it forcibly disconnects the power unit and the crane, and the crane is forced to stop running, and the overtravel alarm light is always on.

[0021] The advantages and positive effects achieved by the present invention are:

[0022] 1. The travel limit device of the present invention realizes the automation and precision of crane movement through the PLC control system, effectively solving the problem of low efficiency caused by manual adjustment and movement of traditional cranes. Automated control reduces manual intervention, speeds up the production process, and avoids multiple alignments and readjustments caused by over-travel movement, thereby significantly improving overall production efficiency.

[0023] 2. During the lifting of molten metal, once the crane moves beyond the travel range, it may not only cause collisions between equipment, but also cause serious safety accidents. The device uses an integrated travel limit system to automatically stop the crane and alarm when it approaches the preset limit value, effectively avoiding the occurrence of overtravel, ensuring that the crane operates safely and stably within the specified area, greatly improving the safety of operations and protecting the lives of operators.

[0024] 3. The built-in precise position sensor and gravity sensor of the travel limit device can monitor the position of the crane and the weight of the hoisted object in real time, ensuring the precise control of the crane during movement. This precision not only reduces errors and waste in the production process, but also improves the quality and consistency of the product, meeting the high requirements of modern industry for production accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the equipment control system of the present invention;

[0026] Figure 2 is a control flow chart of the present invention;

[0027] Figure 3 This is the overtravel limit control flow chart of the present invention. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below in conjunction with specific examples. The following examples are only illustrative and not restrictive, and the protection scope of the present invention cannot be limited thereto.

[0029] The raw materials used in the present invention, unless otherwise specified, are conventional commercial products, the methods used in the present invention, unless otherwise specified, are conventional methods in the art, and the quality of each substance used in the present invention is conventional quality. The structures, connection relationships, etc. not described in detail in the present invention can be understood as conventional technical means in the art.

[0030] A travel limit device for a molten metal lifting crane, such as Figures 1 to 3 As shown, the device includes a PLC control system, a weighing system, a travel limit system, and a crane system. The input end of the PLC control system is connected to the weighing system and the travel limit system. The PLC control system can receive signals from the weighing system and the travel limit system. The input end of the crane system is connected to the output end of the PLC control system. The crane system can be switched on and off by the PLC control system. The weighing system is connected to the crane, and the weighing system can detect the weight of the object hung by the crane and output a corresponding signal.

[0031] The present invention realizes the automation and precision of crane movement through the PLC control system, effectively solving the problem of low efficiency caused by the manual adjustment and movement of traditional cranes. Automated control reduces manual intervention and speeds up the production process. The travel limit system can automatically stop the movement and alarm when the crane approaches the preset limit value, effectively avoiding the occurrence of overtravel, preventing the collision of the crane with other equipment, and improving the safety of the operation.

[0032] In this embodiment, the PLC control system includes a detection unit and a controller, the weighing system includes a weighing unit and a gravity sensor, the travel limit system includes a limit contactor and a position sensor, and the crane system includes a crane direction contactor, a power unit, a crane and a crane hook;

[0033] The detection unit is connected to the controller, and the detection unit can detect whether the equipment of the controller is operating normally. The weighing unit is connected to the gravity sensor, and the weighing unit can weigh the weight hoisted by the crane and transmit it to the gravity sensor. The gravity sensor outputs a gravity signal. The limit contactor is connected to the crane direction contactor, and the position sensor is connected to the crane. The limit contactor is connected to the position sensor through the controller, and can detect whether the operating position of the crane exceeds the limit position. The controller is connected to the crane system, and the controller can control the direction movement operation of the crane's trolley. The crane direction contactor, the crane and the crane hook are connected in sequence. The crane direction contactor is connected to the controller, and the direction and movement amount of the crane can be controlled by the controller. The crane hook is connected to the weighing unit, and the weighing unit can weigh the weight hoisted by the crane hook. The power unit, the controller and the crane are connected in sequence, and the controller can control the start and stop of the crane through the power unit.

[0034] The present invention realizes automation and precision of crane movement through the PLC control system, effectively solving the problem of low efficiency caused by manual adjustment and movement of traditional cranes. Automated control reduces manual intervention and speeds up the production process, while avoiding multiple alignments and readjustments caused by over-travel movement, thereby significantly improving overall production efficiency. By introducing the PLC control system and the travel limit system, the device highly automates the operation process of the molten metal lifting crane, reduces the links of manual intervention, and improves the automation level of the production line. This not only improves production efficiency, but also reduces labor intensity and improves the working environment of workers. The built-in travel limit system of the device can automatically stop moving and alarm when the crane approaches the preset limit value, effectively avoiding the occurrence of over-travel phenomenon, preventing the collision of the crane with other equipment, and improving the safety of the operation.

[0035] The method for using the travel limit device of the molten metal lifting crane as described above comprises the following steps:

[0036] (1) Start the PLC control system, and control the position sensor and gravity sensor to start operation through the PLC control system;

[0037] (2) The detection unit performs hardware detection on the PLC control system to check whether the controller hardware status is intact. If it is intact, it proceeds to the next step. Otherwise, it issues a device alarm to remind the staff that the equipment is damaged and needs repair;

[0038] (3) After the detection is normal, the power unit is turned on and the equipment starts running. Then, the subsequent operation is carried out according to the operator's operation selection. If manual operation is selected, the program skips the movement instruction and the crane moves according to the operator's operation. If automatic operation is selected, the work area point is moved according to the program setting;

[0039] (4) When the crane lifts an object, the weighing unit transmits data to the gravity sensor;

[0040] (5) If the value of the gravity sensor reaches the set threshold, the limit program is started, and the controller will make a judgment based on the data of the position sensor. When the value of the position sensor reaches the limit value, the limit contactor closes, the crane system is disconnected, the crane stops moving and an alarm is sounded;

[0041] (6) Press the stop button of the controller, the power unit is turned off, and then the position sensor and gravity sensor are turned off. The detection unit re-detects the hardware of the PLC control system to check whether the hardware status of the controller is intact. If it is intact, the control system stops running. Otherwise, the equipment alarm is triggered to remind the staff that the equipment is damaged and needs repair.

[0042] In this embodiment, the travel limit system also includes an over-travel limit contact system, the over-travel limit system includes a crane limit armature, a section limit core and an over-travel alarm lamp, the section limit core is set to be multiple and distributed beside the crane track at the junction of workshops in different sections, the crane limit armature is set on the crane side plate on the track side with the section limit core, the output end of the section limit core is connected to the input end of the crane limit armature, the output end of the crane limit armature is connected to the input end of the controller, the output end of the over-travel alarm lamp is connected to the input end of the section limit core, the input end of the over-travel alarm lamp is connected to the output end of the controller, and the crane limit armature is connected to the input end of the controller. Through the setting of the over-travel limit system, it is ensured that when the travel limit device fails or is manually operated by mistake, its movement safety can still be guaranteed.

[0043] Preferably, the working steps of the overtravel limit contact circuit are as follows:

[0044] According to the limit value set by the control system, the section limit iron core outside the section where the set threshold is located is energized. If the crane travel limit contact system fails and moves over the travel or the staff makes an operating error, when the armature on the crane side panel passes through the section limit iron core, the crane limit armature and the section limit iron core are fitted and connected due to the electromagnetic effect. After the controller receives the electrical signal from the section limit iron core, it forcibly disconnects the power unit and the crane, and the crane is forced to stop running, and the overtravel alarm light is always on.

[0045] Although the embodiments of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments.

Claims

1. A travel limit device for a molten metal lifting crane, characterized in that: The device includes a PLC control system, a weighing system, a travel limit system, and a crane system. The input end of the PLC control system is connected to the weighing system and the travel limit system. The PLC control system can receive signals from the weighing system and the travel limit system. The input end of the crane system is connected to the output end of the PLC control system. The crane system can be switched on and off by the PLC control system. The weighing system is connected to the crane, and the weighing system can detect the weight of the object hung by the crane and output a corresponding signal.

2. The travel limit device of the molten metal lifting crane according to claim 1 is characterized in that: The PLC control system includes a detection unit and a controller, the weighing system includes a weighing unit and a gravity sensor, the travel limit system includes a limit contactor and a position sensor, and the crane system includes a crane direction contactor, a power unit, a crane and a crane hook; The detection unit is connected to the controller, and the detection unit can detect whether the equipment of the controller is operating normally. The weighing unit is connected to the gravity sensor, and the weighing unit can weigh the weight hoisted by the crane and transmit it to the gravity sensor. The gravity sensor outputs a gravity signal. The limit contactor is connected to the crane direction contactor, and the position sensor is connected to the crane. The limit contactor is connected to the position sensor through the controller, and can detect whether the operating position of the crane exceeds the limit position. The controller is connected to the crane system, and the controller can control the direction movement operation of the crane's trolley. The crane direction contactor, the crane and the crane hook are connected in sequence. The crane direction contactor is connected to the controller, and the direction and movement amount of the crane can be controlled by the controller. The crane hook is connected to the weighing unit, and the weighing unit can weigh the weight hoisted by the crane hook. The power unit, the controller and the crane are connected in sequence, and the controller can control the start and stop of the crane through the power unit.

3. The method for using the travel limit device of the molten metal lifting crane according to any one of claims 1 to 2, wherein the steps are as follows: (1) Start the PLC control system, and control the position sensor and gravity sensor to start operation through the PLC control system; (2) The detection unit performs hardware detection on the PLC control system to check whether the controller hardware status is intact. If it is intact, it proceeds to the next step. Otherwise, it issues a device alarm to remind the staff that the equipment is damaged and needs repair; (3) After the detection is normal, the power unit is turned on and the equipment starts running. Then, the subsequent operation is carried out according to the operator's operation selection. If manual operation is selected, the program skips the movement instruction and the crane moves according to the operator's operation. If automatic operation is selected, the work area point is moved according to the program setting; (4) When the crane lifts an object, the weighing unit transmits data to the gravity sensor; (5) If the value of the gravity sensor reaches the set threshold, the limit program is started, and the controller will make a judgment based on the data of the position sensor. When the value of the position sensor reaches the limit value, the limit contactor closes, the crane system is disconnected, the crane stops moving and an alarm is sounded; (6) Press the stop button of the controller, the power unit is turned off, and then the position sensor and gravity sensor are turned off. The detection unit re-detects the hardware of the PLC control system to check whether the hardware status of the controller is intact. If it is intact, the control system stops running. Otherwise, the equipment alarm is triggered to remind the staff that the equipment is damaged and needs repair.

4. The travel limit device of the molten metal lifting crane according to claim 1 is characterized in that: The travel limit system also includes an over-travel limit contact system, which includes a crane limit armature, a section limit iron core and an over-travel alarm light. The section limit iron cores are provided in multiple numbers and are distributed beside the crane track at the junction of workshops in different sections. The crane limit armature is provided on the crane side panel on the track side with the section limit iron core. The output end of the section limit iron core is connected to the input end of the crane limit armature, the output end of the crane limit armature is connected to the input end of the controller, the output end of the over-travel alarm light is connected to the input end of the section limit iron core, the input end of the over-travel alarm light is connected to the output end of the controller, and the crane limit armature is connected to the input end of the controller.

5. The working steps of the overtravel limit contact circuit as claimed in claim 4 are as follows: According to the limit value set by the control system, the section limit iron core outside the section where the set threshold is located is energized. If the crane travel limit contact system fails and moves over the travel or the staff makes an operating error, when the armature on the crane side panel passes through the section limit iron core, the crane limit armature and the section limit iron core are fitted and connected due to the electromagnetic effect. After the controller receives the electrical signal from the section limit iron core, it forcibly disconnects the power unit and the crane, and the crane is forced to stop running, and the overtravel alarm light is always on.

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