Devices and their operating methods that can reduce the risk of collisions between ground equipment and vehicles

Abstract

This invention proposes a device and its operating method to reduce the risk of collisions between ground equipment and overhead cranes. Considering a scenario where the maximum height of the intermediate frequency furnace exceeds the overhead crane beam during tilting, to prevent the crane from colliding with the furnace during tilting, the intermediate frequency furnace must send a start signal to the overhead crane control system before tilting, stopping the crane's movement and triggering an audible and visual alarm. By adding signal transmitting and receiving devices, interlocking signals are transmitted between the intermediate frequency furnace tilting system and the overhead crane control system. Multi-channel signal interlocking and alarms are implemented through low-voltage cabinet programming, thus reducing the risk of collisions between the ground-based intermediate frequency furnace and the overhead crane.

Description

Technical Field

[0001] This invention belongs to the field of aluminum processing and manufacturing technology, and in particular relates to a device and its working method that can reduce the risk of collision between ground equipment and vehicles. Background Technology

[0002] Induction furnaces are the main equipment in casting, forging, and heat treatment workshops. Their stability, reliability, and safety are essential for the normal and stable operation of the casting, forging, and heat treatment production lines.

[0003] Due to the limitations of the workshop and equipment dimensions, when the medium-frequency furnace tilts, the ground equipment reaches its highest position, and its height may exceed the overhead crane beam. If the crane passes this point without stopping in time, the overhead crane beam will scrape against the ground equipment, causing damage to both pieces of equipment. Summary of the Invention

[0004] To prevent the overhead crane from scraping or colliding with the induction furnace during operation and to ensure safe production, the present invention aims to provide a device and application method that can reduce the risk of collision between ground equipment and the overhead crane.

[0005] By adding a signal transmitter to the ground equipment control panel and a signal receiver to the overhead crane, when the furnace body tilts, the ground equipment transmits a furnace status signal. When the overhead crane receives this signal, it cuts off the control circuit for the crane's operation and stops running, thereby reducing the risk of collision between the ground equipment and the crane.

[0006] To achieve the above objectives, this invention adds a status detection limit switch and an angle gauge at the tilting position of the medium-frequency furnace body, adds a relay switch and a signal transmitting device inside the control cabinet, and adds a selectable switch and a running status indicator light to the operating panel. The tilting status of the furnace body (limit switch and angle gauge signals) is processed by the PLC and connected to the signal transmitting device, and interconnected with the status indicator light and selectable switch.

[0007] Meanwhile, a signal receiving device and an alarm device are added to the crane control cabinet, and connected in series with the trolley control circuit through an intermediate relay.

[0008] The specific technical solution adopted is as follows:

[0009] A device for reducing the risk of collisions between ground equipment and vehicles, characterized in that:

[0010] A furnace body tilt limit switch (1) and a furnace body tilt angle meter (2) are installed at the tilt position of the medium frequency furnace body, and are respectively connected to the signal transmitting device (6) installed in the control cabinet via PLC (3) and selector switch (5).

[0011] The limit and angle instrument signals indicating the tilting state of the furnace body are processed by PLC (6) and then sent to the signal transmitting device (6).

[0012] A signal receiving device (7) is installed on the crane control cabinet and connected in series with the trolley control circuit through an intermediate relay.

[0013] Furthermore, the selection switch (5) and the running status indicator are set on the operating table of the medium frequency furnace, and the running status indicator is connected to the PLC (3).

[0014] Furthermore, the signal receiving device (7) is connected to the audible and visual alarm (8) and the frequency converter (9) of the trolley.

[0015] Furthermore, when the furnace body tilt limit switch (1) detects the tilt of the furnace body and the tilt angle collected by the furnace body tilt angle meter (2) is greater than the set value, if the selector switch (5) is in the running mode, the signal transmitter (6) outputs the corresponding signal: if the trolley is in the stopped state, the output signal 1 will cut off the trolley motor control circuit, and the audible and visual alarm (8) will start to maintain the running state; if the trolley is in the running state, the output signal 2 will cause the frequency converter (9) to drive the motor to slow down until it stops running, and the output signal 1 will cause the audible and visual alarm (8) to start to maintain the running state.

[0016] Furthermore, the analog signal sent by the furnace body tilt angle meter (2) is processed by the PLC program: after being compared with the set value, it is converted into the angle meter digital signal, and finally converted into the output signal 2 to achieve the purpose of synchronously controlling the speed reduction and stopping of the trolley according to the angle size: among which, the larger the tilt angle, the shorter the frequency conversion speed reduction time is set, so as to achieve faster stopping.

[0017] The present invention and its preferred embodiment significantly reduce the risk of collision between ground-based intermediate frequency furnace equipment and overhead cranes without affecting existing equipment or significantly increasing costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the anti-scratch and impact system according to an embodiment of the present invention.

[0019] Figure 2 This is a wiring diagram of the anti-scratch and impact system according to an embodiment of the present invention.

[0020] Figure 3 This is a logic diagram of the anti-scratch and collision system according to an embodiment of the present invention. Detailed Implementation

[0021] To make the features and advantages of this patent more apparent and understandable, specific embodiments are provided below for detailed explanation:

[0022] In this embodiment, considering the scenario where the maximum height of the intermediate frequency furnace exceeds the overhead crane beam during tilting, to prevent the crane from scraping or colliding with the furnace during tilting, the intermediate frequency furnace needs to send a start signal to the crane control system before tilting to stop the crane's movement and trigger an audible and visual alarm. By adding signal transmitting and receiving devices, interlocking signals are transmitted between the intermediate frequency furnace tilting system and the crane control system. Multi-channel signal interlocking and alarms are implemented through low-voltage cabinet programming, reducing the risk of collision between the ground-based intermediate frequency furnace and the crane.

[0023] Therefore, the main design concept of this invention is: by adding a signal transmitting device to the ground equipment operating platform and a signal receiving device to the traveling crane, when the furnace body tilts, the ground equipment transmits a furnace body status signal. When the traveling crane receives this signal, it cuts off the control circuit of the crane's operation and stops running, thereby reducing the risk of collision between the ground equipment and the traveling crane.

[0024] In this embodiment, as Figure 1 As shown in the figure, 1 is the furnace body tilt limit switch, 2 is the furnace body tilt angle meter, 3 is the PLC, 4 is the furnace body, 5 is the selector switch, 6 is the signal transmitting device, and 7 is the signal receiving device. When the furnace body tilts, the limit status signal and the angle meter status signal are processed by the PLC 3 and then input to the signal transmitting device 6 through the selector switch 5. The signal transmitting device 6 then transmits the signals. After receiving the signals, the signal receiving device 7 reduces the speed of the inverter 9 of the trolley 10 to stop operation and activates the audible and visual alarm 8.

[0025] In this embodiment, as Figure 2 As shown, A and B are the input power supplies, C is the limit signal generated by the furnace body tilt limit switch, D is the angle gauge signal, E is the input signal light, F is the output signal light, G is the interlock signal controlling the motor frequency converter, and H is the trolley control interlock signal. When the limit signal or angle gauge signal is input, the corresponding input signal lights on the transmitting signal device will remain green. When the receiving signal device receives the signal, the corresponding output signal lights on the receiving signal device will remain green.

[0026] In this embodiment, as Figure 3As shown, to achieve the function of slowing down and stopping the trolley or preventing it from starting when the furnace body is tilted, it is necessary to sort out the signal logic of each signal in the ground trolley control cabinet. When the limit switch detects that the furnace body is tilted and the tilt angle is greater than the set value, if the selector switch on the control panel is in the running mode, the input signal DI light will be constantly lit when the transmitter and receiver are powered on. When the signal receiver is powered on and the communication is normal, the output signal DO light will remain constantly lit. At this time, if the trolley is stopped, output signal 1 will cut off the trolley motor control circuit, and the audible and visual alarm lights will be activated to maintain the running state. If the trolley is running, output signal 2 will cause the trolley inverter drive motor to slow down until it stops, and output signal 1 will activate the audible and visual alarm lights to maintain the running state.

[0027] In this embodiment, the angle gauge analog signal is processed by PLC programming: after being compared with the set value, it becomes the angle gauge digital signal, and finally converted into output signal 2 to achieve the purpose of synchronously controlling the trolley to slow down and stop according to the angle size, as shown in Table 1; in addition, for the convenience of inspection and maintenance, a run / cancel selection switch is specially added in this embodiment. This case has been well applied in the field.

[0028] Table 1: Comparison of Angle Size and Inverter Deceleration Time

[0029]

[0030] This patent is not limited to the above-described preferred embodiments. Anyone can derive other forms of devices and their operating methods that can reduce the risk of collisions between ground equipment and vehicles under the guidance of this patent. All equivalent changes and modifications made within the scope of the claims of this invention shall fall within the scope of this patent.

Claims

1. A device for reducing the risk of collisions between ground equipment and vehicles, characterized in that: A furnace body tilt limit switch (1) and a furnace body tilt angle meter (2) are installed at the tilt position of the medium frequency furnace body, and are respectively connected to the signal transmitting device (6) installed in the control cabinet via PLC (3) and selector switch (5). The limit and angle instrument signals indicating the tilting state of the furnace body are processed by PLC (6) and then sent to the signal transmitting device (6). A signal receiving device (7) is installed on the crane control cabinet and connected in series with the trolley control circuit through an intermediate relay; The selector switch (5) and the running status indicator are set on the operating table of the medium frequency furnace, and the running status indicator is connected to the PLC (3). The signal receiving device (7) is connected to the audible and visual alarm (8) and the frequency converter (9) of the trolley. When the furnace body tilt limit switch (1) detects that the furnace body is tilted, and the tilt angle collected by the furnace body tilt angle meter (2) is greater than the set value, if the selector switch (5) is in the running mode, the signal transmitter (6) outputs the corresponding signal: if the trolley is in the stopped state, the output signal 1 will cut off the trolley motor control circuit, and the audible and visual alarm (8) will start to maintain the running state; if the trolley is in the running state, the output signal 2 will cause the frequency converter (9) to drive the motor to slow down until it stops running, and the output signal 1 will cause the audible and visual alarm (8) to start to maintain the running state. The analog signal sent by the furnace body tilt angle meter (2) is processed by the PLC program: after being compared with the set value, it is converted into the angle meter digital signal, and finally converted into the output signal 2 to achieve the purpose of synchronously controlling the speed reduction and stopping of the trolley according to the angle size: among which, the larger the tilt angle, the shorter the frequency conversion speed reduction time is set, so as to achieve faster stopping.

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