Operation method for gas carrier system

Abstract

To provide an operation method for a gas carrier system which conveys scraps discharged from a press working machine for press working a material while mounting the scraps on carrier gas discharged from an air blower.SOLUTION: An operation method for a gas carrier system instead of a conventional operation method for a gas carrier system sets a speed of carrier gas to a set speed from a stand-by speed when an operation start signal meaning to operate a press working machine is turned ON, in a state in which the speed of the carrier gas is the stand-by speed, and sets the speed of the carrier gas to be one of a zero speed, the stand-by speed and a cleaning speed, corresponding to a combination of ON / OFF of an operation start signal, a continuous operation mode / intermittent operation mode of an operation mode signal, press operation preparation OK / press operation preparation NG of a press operation preparation signal, and conveyance system preparation OK / conveyance system preparation NG of a conveyance system preparation signal, in other states.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a method for operating a pneumatic conveying system, and more particularly to a method for operating a pneumatic conveying system for conveying scrap generated by a press machine by using a conveying gas. [Background technology]

[0002] To transport solids, a pneumatic conveying system is used, which transports the solids in a gas stream. For example, pneumatic conveying systems are used to transport scrap generated by pressing machines.

[0003] The press system is composed of a press machine, a material supply device, a scrap recovery device, a gas conveying system, and a control device. A press machine is a machine that presses materials by transmitting the rotation of a press motor via a clutch to rotate a crankshaft and move a slide up and down. For example, a press machine is made up of a press frame, a bed, a crown, a press motor, a clutch, a crankshaft, a brake, a connecting rod, a bolster, and a slide. An upper die and a lower die are disposed between the slide and the bolster. The material supplying device is a device that supplies material to the press machine, and is composed of an uncoiler, a roll feeder, and a winding machine. The scrap recovery device is a device that recovers scrap generated by the press machine and guides it to the pneumatic conveying system. For example, the scrap recovery device may consist of a hopper. The scrap is guided into a hopper and enters a pneumatic conveying system, which transports the scrap to a terminal for collection. The pneumatic conveying system is a machine that conveys scrap discharged from a press machine by placing it on a conveying gas discharged by a blower, and is composed of a blower, an ejector, and conveying piping. The gas discharged by the blower is discharged to the ejector and flows into the conveying pipe. For example, the rotation speed of a blower is controlled by an inverter. The press operation panel is composed of a power supply device, a press control device, a pneumatic conveying system control device, and an operation device.

[0004] The press control device controls the press system. The gas conveying system control device realizes a control process for controlling the velocity of the conveying gas flowing through the conveying pipe to a predetermined velocity. The press control device and the pneumatic conveying system control device may be an integrated control device. The integrated control implements press control functions and pneumatic conveying system control functions. For example, the control step may cause the velocity of the carrier gas to be one of a zero velocity, a standby velocity, a set velocity, and a cleaning velocity. Zero speed is a wind speed that is zero or close to zero. The standby speed is zero or a slight air speed, which is the speed of the conveying gas in the standby state before receiving the scrap. The set speed is the velocity of the conveying gas required to properly convey the incoming scrap. A plurality of set speeds may be set in accordance with the bulk density and amount of scrap generated. The cleaning velocity is the velocity of the conveying gas required to clean the inside of the conveying piping without receiving scrap. The standby speed is a speed slower than the set speed. The set speed is slower than the cleaning speed.

[0005] Conventionally, the velocity of the carrier gas is controlled in response to the on / off state of the press motor. The state of the press motor changes between on and off. When the press motor is in the on state, the press motor rotates. When the press motor is in the off state, the press motor does not rotate. For example, when control is started, the speed of the carrier gas is changed from zero speed to standby speed, and when the press motor state changes from off to on, the speed of the carrier gas is changed from standby speed to set speed, and when the press motor state changes from on to off, the speed of the carrier gas is changed from the set speed to cleaning speed, and after a certain time has elapsed, the speed is changed from cleaning speed to zero speed. While this approach can simplify control, it is difficult to say that it saves energy.

[0006] The inventors have considered a control process for controlling the velocity of the carrier gas in response to clutch on / off changes. The clutch state changes between on and off. When the clutch is in the on state, the clutch transmits the rotation of the press motor to the crankshaft. When the clutch is in the off state, the clutch does not transmit the rotation of the press motor to the crankshaft. For example, when control starts, the speed of the carrier gas is changed from zero speed to standby speed, when the clutch state changes from off to on, the speed of the carrier gas is changed from standby speed to set speed, when the clutch state changes from on to off, the speed of the carrier gas is changed from set speed to cleaning speed, and after a certain time has elapsed, the speed is changed from cleaning speed to standby speed or zero speed. This will save more energy than the control described above. On the other hand, when operating a press system, when replacing the upper and lower dies, an inching operation may be performed in which the clutch or press motor is repeatedly turned on and off to adjust the positions of the upper and lower dies. If a control process is adopted in which the speed of the conveying gas is simply changed in response to the on / off of the clutch, the speed of the conveying gas will be changed frequently during the inching operation, which may place a heavy load on the blower.

[0007] The inventors have investigated an operation method for a pneumatic conveying system that saves energy and does not shorten the life of the device. Summary of the Invention [Problem to be solved by the invention]

[0008] In view of the above-mentioned demand, the present invention aims to provide an operating method of a pneumatic conveying system that is efficient for transporting scrap discharged from a press machine that presses a material by placing it on a conveying gas discharged by a blower. [Means for solving the problem]

[0009] In order to achieve the above object, the present invention provides an operating method for a gas conveying system that conveys scrap discharged from a press machine that presses a material on a conveying gas discharged by a blower, the method comprising: a receiving step of receiving, from the press machine, an operation start signal that changes between ON and OFF and an operation mode signal that changes between a continuous operation mode and an intermittent operation mode; and a control step of setting the speed of the conveying gas to one of zero speed, standby speed, set speed, and cleaning speed in response to a combination of ON / OFF of the operation start signal and the continuous operation mode / intermittent operation mode of the operation mode signal, Where: When the operation start signal is ON, it means that the press machine is operated, and when the operation start signal is OFF, it means that the press machine is not operated. When the operation mode signal is in the continuous operation mode, it means that the press machine is in an operating state while continuously discharging scrap. When the operation mode signal is in the intermittent operation mode, it means that the press machine is in an operating state while not discharging scrap or while intermittently discharging scrap. The speed of the conveying gas changes among zero speed, standby speed, cleaning speed, and set speed, where zero speed is a wind speed of zero, standby speed is zero or a slight wind speed, the set speed is a wind speed that corresponds to the bulk density and amount of scrap generated and can convey the scrap efficiently, the cleaning speed is a wind speed sufficient to convey the scrap accumulated in the gas conveying system, the standby speed is slower than the set speed, and the set speed is slower than the cleaning speed.

[0010] In the above-described configuration of the present invention, the receiving step receives from the press machine an operation start signal that changes between ON and OFF and an operation mode signal that changes between a continuous operation mode and an intermittent operation mode. The control step sets the speed of the carrier gas to one of zero speed, standby speed, set speed, and cleaning speed in response to a combination of ON / OFF of the operation start signal and the continuous operation mode / intermittent operation mode of the operation mode signal. Where: When the operation start signal is ON, it means that the press machine is operating. When the operation start signal is OFF, it means that the press machine is not operating. When the operation mode signal is in continuous operation mode, it means that the press machine is operating by continuously discharging scrap. When the operation mode signal is in intermittent operation mode, it means that the press machine is operating by not discharging scrap or by discharging scrap intermittently. The speed of the conveying gas changes between zero speed, standby speed, set speed, and cleaning speed. Zero speed is a wind speed of zero or close to zero. Standby speed is zero or a slight wind speed. The set speed is a wind speed that corresponds to the bulk density and amount of scrap generated and can efficiently transport the scrap. The cleaning speed is a wind speed sufficient to transport the scrap accumulated in the gas conveying system. The standby speed is slower than the set speed. The set speed is slower than the cleaning speed. As a result, the gas conveying system can be optimally controlled according to the state of the press machine.

[0011] In order to achieve the above object, the present invention provides an operating method for a gas conveying system that conveys scrap discharged from a press machine that presses a material on a conveying gas discharged by a blower, the method comprising: a receiving step of receiving, from the press machine, an operation start signal that changes between ON and OFF, an operation mode signal that changes between a continuous operation mode and an intermittent operation mode, and a press operation preparation signal that changes between press operation ready OK and press operation not ready; a system check step of generating a gas conveying system standby signal that changes between gas conveying system standby ready OK and gas conveying system standby not ready; and a control step of setting the speed of the conveying gas to one of zero speed, standby speed, set speed, and cleaning speed in response to a combination of ON / OFF of the operation start signal, continuous operation mode / intermittent operation mode of the operation mode signal, press operation ready OK / press operation not ready of the press operation preparation signal, and gas conveying system standby ready OK / gas conveying system standby not ready of the gas conveying system standby signal, Where: When the operation start signal is ON, it means that the press machine is operated, when the operation start signal is OFF, it means that the press machine is not operated, when the operation mode signal is in continuous operation mode, it means that the press machine is in a state where it can be operated continuously, when the operation mode signal is in intermittent operation mode, it means that the press machine is in a state where it can be operated intermittently, when the press operation ready signal is press operation ready, it means that the system check has confirmed that the function of the gas conveying system is normal, when the press operation ready signal is press operation not ready, it means that the function of the gas conveying system has not been confirmed to be normal, when the gas conveying system standby signal is gas conveying system standby ready, When the gas conveying system standby signal is in the gas conveying system standby preparation NG state, it means that the system check has confirmed that the function of the gas conveying system standby signal is normal, and when the gas conveying system standby signal is in the gas conveying system standby preparation NG state, it means that the system check has not confirmed that the function of the gas conveying system standby signal is normal, the speed of the conveying gas varies among zero speed, standby speed, set speed, and cleaning speed, zero speed is a wind speed of zero or close to zero, standby speed is zero or a slight wind speed, the set speed is a wind speed that can efficiently convey scrap corresponding to the bulk specific gravity and amount of scrap generated, cleaning speed is a wind speed sufficient to convey scrap accumulated in the gas conveying system, standby speed is slower than the set speed, and the set speed is slower than the cleaning speed.

[0012] In the above-described configuration of the present invention, the receiving step receives from the press processing machine an operation start signal that changes between ON and OFF, an operation mode signal that changes between a continuous operation mode and an intermittent operation mode, and a press operation preparation signal that changes between press operation ready and press operation not ready. The system check step generates a gas conveying system standby signal that changes between gas conveying system standby ready and gas conveying system standby not ready. The control step sets the speed of the conveying gas to one of zero speed, standby speed, set speed, and cleaning speed in response to a combination of ON / OFF of the operation start signal, continuous operation mode / intermittent operation mode of the operation mode signal, press operation ready OK / press operation not ready of the press operation preparation signal, and gas conveying system standby ready OK / gas conveying system standby not ready of the gas conveying system standby signal. Where: When the operation start signal is ON, it means that the press machine is operated. When the operation start signal is OFF, it means that the press machine is not operated. When the operation mode signal is in the continuous operation mode, it means that the press machine is in a state where it can be operated continuously. When the operation mode signal is in the intermittent operation mode, it means that the press machine is in a state where it can be operated intermittently. When the press operation ready signal is "Press operation ready OK", it means that the system check has confirmed that the gas conveying system is functioning normally. When the press operation ready signal is "Press operation not ready", it means that the gas conveying system is not functioning normally. When the gas conveying system standby signal is "Gas conveying system standby ready OK", it means that the system check has confirmed that the gas conveying system standby signal is functioning normally. When the gas conveying system standby signal is "Gas conveying system standby not ready", it means that the system check has not confirmed that the gas conveying system standby signal is functioning normally. The speed of the conveying gas varies between zero speed, standby speed, cleaning speed, and set speed. Zero speed is a wind speed of zero or close to zero. Standby speed is zero or a slight wind speed. The set speed is a wind speed that corresponds to the bulk density and amount of scrap and can efficiently transport the scrap. The cleaning speed is a wind speed that is sufficient to transport the scrap accumulated in the gas conveying system. Standby speed is slower than the set speed. The set speed is slower than the cleaning speed. As a result, the gas conveying system can be optimally controlled according to the state of the press machine and the state of the gas conveying system.

[0013] The present invention includes any one of the embodiments described below, or a combination of two or more of the embodiments described below.

[0014] In a method for operating a gas conveying system according to an embodiment of the present invention, a control process changes the speed of the conveying gas from zero speed to a standby speed when the press operation ready signal indicates that the press operation is ready and the gas conveying system standby signal indicates that the gas conveying system is ready for standby, while the speed of the conveying gas is zero speed. In the configuration of the above embodiment, when the speed of the conveying gas is zero, the press operation preparation signal indicates that the press operation is ready, and the gas conveying system standby signal indicates that the gas conveying system is ready for standby, the speed of the conveying gas is changed from zero to the standby speed. As a result, the gas conveying system can be optimally controlled according to the state of the press machine and the state of the gas conveying system.

[0015] In an operating method of a gas conveying system according to an embodiment of the present invention, a control process changes the speed of the conveying gas from the standby speed to a set speed when an operation start signal is ON while the speed of the conveying gas is at a standby speed, and otherwise changes the speed of the conveying gas to one of zero speed, standby speed, or cleaning speed depending on the situation. In the configuration of the above embodiment, when the speed of the conveying gas is at standby speed and the operation start signal is ON, the speed of the conveying gas is changed from the standby speed to the set speed, and at other times, the speed of the conveying gas is set to one of zero speed, standby speed, or cleaning speed depending on the situation. As a result, the gas conveying system can be optimally controlled according to the state of the press machine.

[0016] In an embodiment of the present invention, a method for operating a gas conveying system includes a control process for changing the speed of the conveying gas from the set speed to a cleaning speed when the speed of the conveying gas is at a set speed, the operation mode signal is in continuous operation mode, and the operation start signal is OFF. In the configuration of the above embodiment, the control process changes the speed of the carrier gas from the set speed to the cleaning speed when the speed of the carrier gas is at the set speed, the operation mode signal is in continuous operation mode, and the operation start signal is OFF. As a result, the gas conveying system can be optimally controlled according to the state of the press machine.

[0017] In a method of operating a gas conveying system according to an embodiment of the present invention, a control step changes the speed of the conveying gas from the set speed to a cleaning speed when the speed of the conveying gas is at a set speed, the operation mode signal is in the continuous operation mode, the press operation preparation signal indicates that press operation is ready and the operation start signal is OFF, or the press operation preparation signal indicates that press operation is not ready. In the configuration of the above embodiment, the control process changes the speed of the carrier gas from the set speed to the cleaning speed when the speed of the carrier gas is at the set speed, the operation mode signal is in the continuous operation mode, the press operation preparation signal indicates that press operation is ready and the operation start signal is OFF, or the press operation preparation signal indicates that press operation is not ready. As a result, the gas conveying system can be optimally controlled according to the state of the press machine.

[0018] In an operating method of a gas conveying system according to an embodiment of the present invention, a control process changes the speed of the conveying gas from the cleaning speed to one of standby speed or zero speed when a certain time T1 has elapsed since the speed of the conveying gas changed from the set speed to the cleaning speed while the speed of the conveying gas is at the cleaning speed. In the configuration of the above embodiment, the control process changes the speed of the carrier gas from the cleaning speed to one of the standby speed or zero speed when a certain time T1 has elapsed since the speed of the carrier gas changed from the set speed to the cleaning speed while the speed of the carrier gas is at the cleaning speed. As a result, the gas conveying system can be optimally controlled according to the state of the press machine.

[0019] In a method for operating a gas conveying system according to an embodiment of the present invention, the control step changes the speed of the conveying gas from the cleaning speed to one of standby speed or zero speed when the press operation ready signal indicates that press operation is ready and the gas conveying system standby signal indicates that the gas conveying system is ready to standby, after a certain time T1 has elapsed since the speed of the conveying gas is changed from the set speed to the cleaning speed, while the speed of the conveying gas is at the cleaning speed. In the configuration of the above embodiment, the control process changes the speed of the conveying gas from the cleaning speed to one of the standby speed or zero speed when the press operation ready signal indicates that press operation is ready and the gas conveying system standby signal indicates that the gas conveying system is ready to standby and is a fixed time T1 has elapsed since the speed of the conveying gas is changed from the set speed to the cleaning speed. As a result, the gas conveying system can be optimally controlled according to the state of the press machine.

[0020] In an operating method of a gas conveying system according to an embodiment of the present invention, a control process changes the speed of the conveying gas from the cleaning speed to a standby speed when a certain time T1 has elapsed since the speed of the conveying gas changed from the set speed to the cleaning speed while the speed of the conveying gas is at the cleaning speed. In the configuration of the above embodiment, the control process changes the speed of the carrier gas from the cleaning speed to the standby speed when a certain time T1 has elapsed since the speed of the carrier gas changed from the set speed to the cleaning speed while the speed of the carrier gas is at the cleaning speed. As a result, the gas conveying system can be optimally controlled according to the state of the press machine.

[0021] In a method for operating a gas conveying system according to an embodiment of the present invention, a control process changes the speed of the conveying gas from the cleaning speed to the standby speed when the press operation ready signal indicates that press operation is ready and the gas conveying system standby signal indicates that the gas conveying system is ready to standby, after a certain time T1 has elapsed since the speed of the conveying gas is changed from the set speed to the cleaning speed, while the speed of the conveying gas is at the cleaning speed. In the configuration of the above embodiment, the control process changes the speed of the conveying gas from the cleaning speed to the standby speed when the press operation preparation signal indicates that press operation is ready and the gas conveying system standby signal indicates that the gas conveying system is ready to standby and a certain time T1 has elapsed since the speed of the conveying gas is changed from the set speed to the cleaning speed, while the speed of the conveying gas is at the cleaning speed. As a result, the gas conveying system can be optimally controlled according to the state of the press machine.

[0022] In an operating method of a gas conveying system according to an embodiment of the present invention, a control process changes the speed of the conveying gas from the cleaning speed to zero speed when a certain time T1 has elapsed since the speed of the conveying gas changed from a set speed to the cleaning speed while the speed of the conveying gas is at the cleaning speed. In the configuration of the above embodiment, the control process changes the speed of the carrier gas from the cleaning speed to zero speed when a certain time T1 has elapsed since the speed of the carrier gas changed from the set speed to the cleaning speed while the speed of the carrier gas is still at the cleaning speed. As a result, the gas conveying system can be optimally controlled according to the state of the press machine.

[0023] In a method for operating a gas conveying system according to an embodiment of the present invention, a control step changes the speed of the conveying gas from the cleaning speed to zero speed when the press operation preparation signal indicates "press operation preparation NG" or the gas conveying system standby signal indicates "gas conveying system standby preparation NG" when a certain time T1 has elapsed since the speed of the conveying gas changes from the set speed to the cleaning speed while the speed of the conveying gas is at the cleaning speed. In the configuration of the above embodiment, the control process changes the speed of the conveying gas from the cleaning speed to zero speed when the press operation preparation signal indicates "press operation preparation NG" or the gas conveying system standby signal indicates "gas conveying system standby preparation NG" when a certain time T1 has elapsed since the speed of the conveying gas changes from the set speed to the cleaning speed while the speed of the conveying gas is at the cleaning speed. As a result, the gas conveying system can be optimally controlled according to the state of the press machine.

[0024] In an operating method of a gas conveying system according to an embodiment of the present invention, when the speed of the conveying gas is a set speed, the operation mode signal is in intermittent operation mode, and the operation start signal is ON, the control process changes the speed of the conveying gas from the set speed to the standby speed when a certain time T2 has elapsed since the speed of the conveying gas was changed from the standby speed to the set speed. In the configuration of the above embodiment, when the speed of the carrier gas is at the set speed, the operation mode signal is in intermittent operation mode, and the operation start signal is ON, the control process changes the speed of the carrier gas from the set speed to the standby speed when a certain time T2 has elapsed since the speed of the carrier gas was changed from the standby speed to the set speed. As a result, the gas conveying system can be optimally controlled according to the state of the press machine.

[0025] In an operation method of a gas conveying system according to an embodiment of the present invention, the control step changes the speed of the conveying gas from the set speed to the standby speed when a certain time T2 has elapsed since the speed of the conveying gas was changed from the standby speed to the set speed when the speed of the conveying gas is at the set speed, the operation mode signal is in the intermittent operation mode, the press operation preparation signal indicates press operation preparation OK, and the operation start signal is ON. In the configuration of the above embodiment, the control process is such that, when the velocity of the conveying gas is the set speed, the operation mode signal is the intermittent operation mode, the press operation preparation signal indicates press operation preparation OK, and the operation start signal is ON, the velocity of the conveying gas is changed from the set speed to the standby speed when a certain time T2 has elapsed since the velocity of the conveying gas was changed from the standby speed to the set speed. As a result, the gas conveying system can be optimally controlled according to the state of the press machine.

[0026] In an operating method of a gas conveying system according to an embodiment of the present invention, when the speed of the conveying gas is at a set speed, the operation mode signal is in intermittent operation mode, and the operation start signal is OFF, the control process changes the speed of the conveying gas from the set speed to zero speed when a certain time T3 has elapsed since the speed of the conveying gas was set to the set speed. In the configuration of the above embodiment, when the speed of the carrier gas is at the set speed, the operation mode signal is in intermittent operation mode, and the operation start signal is OFF, the control process changes the speed of the carrier gas from the set speed to zero speed when a certain time T3 has elapsed since the speed of the carrier gas was set to the set speed. As a result, the gas conveying system can be optimally controlled according to the state of the press machine.

[0027] In an operation method of a gas conveying system according to an embodiment of the present invention, the control step changes the speed of the conveying gas from the set speed to zero speed when the speed of the conveying gas is at the set speed, the operation mode signal is in the intermittent operation mode, the press operation preparation signal indicates press operation preparation NG, or the operation start signal is OFF. In the configuration of the above embodiment, the control process changes the velocity of the carrier gas from the set speed to zero speed when the velocity of the carrier gas is at the set speed, the operation mode signal is in the intermittent operation mode, the press operation preparation signal is in the press operation preparation NG state, or the operation start signal is OFF, and a certain time T3 has elapsed since the velocity of the carrier gas was set to the set speed. As a result, the gas conveying system can be optimally controlled according to the state of the press machine.

[0028] In an embodiment of the present invention, the method for operating a gas conveying system includes a system check process for detecting an abnormality in the gas conveying system, and a control process for changing the speed of the conveying gas from the set speed to zero speed when the speed of the conveying gas is at a set speed and the operation mode signal is in a continuous operation mode and an abnormality in the gas conveying system is detected. In the configuration of the above embodiment, the system check step can detect an abnormality in the gas conveying system, and the control step changes the speed of the carrier gas from the set speed to zero speed when the operation mode signal is in a continuous operation mode and an abnormality in the gas conveying system is detected while the speed of the carrier gas is at the set speed. As a result, the gas conveying system can be optimally controlled according to the state of the press machine.

[0029] In an embodiment of the present invention, the method for operating a gas conveying system includes a system check process for detecting an abnormality in the gas conveying system, and a control process for changing the speed of the conveying gas from the set speed to zero speed when the speed of the conveying gas is at a set speed and the operation mode signal is in an intermittent operation mode and an abnormality in the gas conveying system is detected. In the configuration of the above embodiment, the system check process can detect an abnormality in the gas conveying system, and the control process changes the speed of the conveying gas from the set speed to zero speed when the speed of the conveying gas is at the set speed, the operation mode signal is in intermittent operation mode, and an abnormality in the gas conveying system is detected. As a result, the gas conveying system can be optimally controlled according to the state of the press machine.

[0030] In an embodiment of the present invention, the system check step can detect an abnormality in the gas conveying system, and the control step changes the speed of the conveying gas from the set speed to zero speed when the speed of the conveying gas is at a set speed, the operation mode signal is in the intermittent operation mode, the press operation preparation signal is "press operation ready," and an abnormality in the gas conveying system is detected. In the configuration of the above embodiment, the system check step can detect an abnormality in the gas conveying system, and the control step changes the speed of the conveying gas from the set speed to zero speed when the speed of the conveying gas is at the set speed, the operation mode signal is in the intermittent operation mode, the press operation preparation signal is "press operation preparation OK," and an abnormality in the gas conveying system is detected. As a result, the gas conveying system can be optimally controlled according to the state of the press machine.

[0031] In a method for operating a gas conveying system according to an embodiment of the present invention, a control step changes the speed of the conveying gas from the standby speed to zero speed when the speed of the conveying gas is at standby speed, the operation mode signal is in the continuous operation mode or the intermittent operation mode, the operation start signal is OFF, the press operation preparation signal is in a state where press operation preparation is NG, or the gas conveying system standby signal is in a state where gas conveying system standby preparation is NG. In the configuration of the above embodiment, the control process changes the speed of the conveying gas from the standby speed to zero speed when the speed of the conveying gas is at the standby speed, the operation mode signal is in the continuous operation mode or the intermittent operation mode, the operation start signal is OFF, the press operation preparation signal is in the press operation preparation NG state, or the gas conveying system standby signal is in the gas conveying system standby preparation NG state. As a result, the gas conveying system can be optimally controlled according to the state of the press machine.

[0032] In an embodiment of the present invention, a control process of an operation method of a gas conveying system maintains the speed of the conveying gas at the standby speed when the speed of the conveying gas is at the standby speed, the operation mode signal is in the continuous operation mode or the intermittent operation mode, the operation start signal is OFF, the press operation preparation signal indicates that the press operation is ready, and the gas conveying system standby signal indicates that the gas conveying system is ready for standby. In the configuration of the above embodiment, the control process maintains the speed of the conveying gas at the standby speed when the speed of the conveying gas is at the standby speed, the operation mode signal is in the continuous operation mode or the intermittent operation mode, the operation start signal is OFF, the press operation preparation signal indicates that press operation is ready, and the gas conveying system standby signal indicates that the gas conveying system is ready for standby. As a result, the gas conveying system can be optimally controlled according to the state of the press machine. Effect of the Invention

[0033] As described above, the method of operating a gas conveying system according to the present invention has the following advantages due to its configuration. The speed of the conveying gas is set to one of zero speed, standby speed, set speed, and cleaning speed according to the combination of ON / OFF of the operation start signal and the continuous operation mode / intermittent operation mode of the operation mode signal, so that the gas conveying system can be optimally controlled according to the state of the press machine. The speed of the conveyed gas is set to one of zero speed, standby speed, set speed, and cleaning speed in response to the combination of the operation start signal (ON / OFF), the operation mode signal (continuous operation mode / intermittent operation mode), the press operation preparation signal (press operation ready OK / press operation not ready), and the gas conveying system standby signal (gas conveying system standby ready OK / gas conveying system standby not ready), so that the gas conveying system can be optimally controlled according to the state of the press machine and the state of the gas conveying system. When the press operation ready signal indicates that the press is ready for operation and the gas conveying system standby signal indicates that the gas conveying system is ready for standby, the speed of the conveyed gas is changed from zero speed to the standby speed, so that the gas conveying system can be optimally controlled according to the state of the press machine and the state of the gas conveying system. When the operation start signal is ON while the speed of the conveying gas is at the standby speed, the speed of the conveying gas is changed from the standby speed to the set speed, and at other times the speed of the conveying gas is set to one of zero speed, standby speed, or cleaning speed depending on the situation, so that the gas conveying system can be optimally controlled according to the state of the press processing machine. When the speed of the conveying gas is at the set speed, the operation mode signal is in the continuous operation mode, and the operation start signal is OFF, the speed of the conveying gas is changed from the set speed to the cleaning speed, so that the gas conveying system can be optimally controlled according to the state of the press processing machine. When the speed of the conveying gas is at the set speed, the operation mode signal is in the continuous operation mode, the press operation preparation signal indicates that press operation is ready and the operation start signal is OFF, or the press operation preparation signal indicates that press operation is not ready, the speed of the conveying gas is changed from the set speed to the cleaning speed, so that the gas conveying system can be optimally controlled according to the state of the press processing machine. When the speed of the carrier gas is at the cleaning speed, and a certain time T1 has elapsed since the speed of the carrier gas changes from the set speed to the cleaning speed, the speed of the carrier gas is changed from the cleaning speed to one of the standby speed or zero speed, so that the gas carrier system can be optimally controlled according to the state of the press machine. When the speed of the conveying gas is at the cleaning speed, when a certain time T1 has elapsed since the speed of the conveying gas changed from the set speed to the cleaning speed, if the press operation preparation signal indicates that press operation is ready and the gas conveying system standby signal indicates that the gas conveying system is ready to standby, the speed of the conveying gas is changed from the cleaning speed to one of the standby speed or zero speed, so that the gas conveying system can be optimally controlled according to the state of the press machine. When the speed of the carrier gas is at the cleaning speed and a certain time T1 has elapsed since the speed of the carrier gas changes from the set speed to the cleaning speed, the speed of the carrier gas is changed from the cleaning speed to the standby speed, so that the gas carrier system can be optimally controlled according to the state of the press machine. When the speed of the conveying gas is at the cleaning speed, if a certain time T1 has elapsed since the speed of the conveying gas changed from the set speed to the cleaning speed and the press operation preparation signal indicates that the press operation is not ready, or if the gas conveying system standby signal indicates that the gas conveying system is not ready to standby, the speed of the conveying gas is changed from the cleaning speed to the standby speed, so that the gas conveying system can be optimally controlled according to the state of the press machine. When the speed of the conveying gas is at the cleaning speed, when a certain time T1 has elapsed since the speed of the conveying gas changed from the set speed to the cleaning speed, if the press operation preparation signal indicates that press operation is ready and the gas conveying system standby signal indicates that the gas conveying system is ready to standby, the speed of the conveying gas is changed from the cleaning speed to the standby speed, so that the gas conveying system can be optimally controlled according to the state of the press processing machine. When the speed of the carrier gas is at the cleaning speed, and a certain time T1 has elapsed since the speed of the carrier gas changes from the set speed to the cleaning speed, the speed of the carrier gas is changed from the cleaning speed to zero speed, so that the gas carrier system can be optimally controlled according to the state of the press machine. When the speed of the conveying gas is at the cleaning speed, if a certain time T1 has elapsed since the speed of the conveying gas changed from the set speed to the cleaning speed and the press operation preparation signal indicates that the press operation is not ready, or if the gas conveying system standby signal indicates that the gas conveying system is not ready to wait, the speed of the conveying gas is changed from the cleaning speed to zero speed, so that the gas conveying system can be optimally controlled according to the state of the press machine. When the speed of the conveying gas is at the set speed, the operation mode signal is in the intermittent operation mode, and the operation start signal is ON, the speed of the conveying gas is changed from the set speed to the standby speed when a certain time T2 has elapsed since the speed of the conveying gas was changed from the standby speed to the set speed, so that the gas conveying system can be optimally controlled according to the state of the press machine. When the speed of the conveying gas is at the set speed, the operation mode signal is in the intermittent operation mode, the press operation preparation signal indicates that press operation is ready, and the operation start signal is ON, the speed of the conveying gas is changed from the set speed to the standby speed when a certain time T2 has elapsed since the speed of the conveying gas was changed from the standby speed to the set speed, so that the gas conveying system can be optimally controlled according to the state of the press machine. When the speed of the conveying gas is at the set speed, the operation mode signal is in the intermittent operation mode, and the operation start signal is OFF, the speed of the conveying gas is changed from the set speed to zero speed when a certain time T3 has elapsed since the speed of the conveying gas was set to the set speed, so that the gas conveying system can be optimally controlled according to the state of the press machine. When the speed of the conveying gas is at the set speed, the operation mode signal is in the intermittent operation mode, the press operation preparation signal indicates that press operation is not ready, or the operation start signal is OFF, the speed of the conveying gas is changed from the set speed to zero speed after a certain time T3 has elapsed since the speed of the conveying gas was set to the set speed, so that the gas conveying system can be optimally controlled according to the state of the press machine. When the speed of the conveying gas is at a set speed, the operation mode signal is in continuous operation mode, and if an abnormality in the gas conveying system is detected, the speed of the conveying gas is changed from the set speed to zero speed, so that the gas conveying system can be optimally controlled according to the condition of the press machine. When the speed of the conveying gas is at a set speed, the operation mode signal is in the intermittent operation mode, and if an abnormality in the gas conveying system is detected, the speed of the conveying gas is changed from the set speed to zero speed, so that the gas conveying system can be optimally controlled according to the condition of the press machine. When the speed of the conveying gas is at the set speed, the operation mode signal is in the intermittent operation mode, the press operation preparation signal indicates that press operation is ready, and an abnormality in the gas conveying system is detected, the speed of the conveying gas is changed from the set speed to zero speed, so that the gas conveying system can be optimally controlled according to the condition of the press machine. When the speed of the conveying gas is at standby speed, the operation mode signal is in continuous operation mode or intermittent operation mode, the operation start signal is OFF, the press operation preparation signal indicates press operation preparation NG, or the gas conveying system standby signal indicates gas conveying system standby preparation NG, the speed of the conveying gas is changed from the standby speed to zero speed, so that the gas conveying system can be optimally controlled according to the state of the press machine. When the speed of the conveying gas is at the standby speed, the operation mode signal is in the continuous operation mode or the intermittent operation mode, the operation start signal is OFF, the press operation preparation signal indicates that press operation is ready, and the gas conveying system standby signal indicates that the gas conveying system is ready for standby, the speed of the conveying gas is maintained at the standby speed, so that the gas conveying system can be optimally controlled according to the state of the press machine. Therefore, it is possible to provide an operating method of a pneumatic conveying system that is efficient in conveying scrap discharged from a press machine that presses a material by placing the scrap on the conveying gas discharged by the blower. [Brief description of the drawings]

[0034] [Figure 1] 1 is a conceptual diagram of a press working system according to an embodiment of the present invention. [Diagram 2] FIG. 1 is a conceptual diagram of an operation of a press working system according to an embodiment of the present invention. [Diagram 3] FIG. 4 is a state transition diagram of an operation method of a gas conveying system according to an embodiment of the present invention. [Figure 4] FIG. 1 is a flowchart showing a method for operating a gas conveying system according to an embodiment of the present invention. [Diagram 5] FIG. 2 is a second flowchart of the method of operating the gas conveying system according to the embodiment of the present invention. [Figure 6] FIG. 3 is a flowchart showing the operation method of the gas conveying system according to the embodiment of the present invention. [Figure 7] 1 is a selection speed table for a gas conveying system according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0035] Hereinafter, an embodiment of the present invention will be described. The gas conveying system according to the embodiment of the present invention is a system that conveys scrap discharged from a press machine 100 that presses a material by placing the scrap on a conveying gas discharged by a blower. The press working system is composed of a press working machine 100, a material supplying device 200, a gas conveying system 300, a scrap recovery device 350, a control device 500, and a die 600. The press machine 100 is a mechanism for pressing a material by transmitting the rotation of a press motor 110 via a clutch 120 to rotate a crankshaft 130 . The material supplying device 200 is a device that supplies material to the press machine 100. The gas conveying system 300 is a system that conveys scrap discharged from a press machine by placing the scrap on a conveying gas discharged by a blower. The control device 500 is a device that controls the press machine 100, the material supply device 200, and the gas conveying system 300. The control device 500 is composed of a computer, a storage device, and an interface. The die 600 is a tool for pressing a material to produce a metal part of a desired shape. FIG. 1 is a conceptual diagram of a press working system according to an embodiment of the present invention. FIG. 2 is a conceptual diagram of the operation of the press working system according to the embodiment of the present invention. An example of a press working system will be described below.

[0036] The press machine 100 is made up of a press motor 110, a clutch 120, a crankshaft 130, a connecting rod 135, a brake 140, a crown 150, a press frame 160, a bed 170, a slide 180, and a bolster 190. The press motor 110 is an electric element that rotates a crankshaft 130 via a clutch 120 . The clutch 120 transmits the rotation of the press motor 110 to the crankshaft 130 when the clutch is in an on state, and does not transmit the rotation of the press motor 110 to the crankshaft 130 when the clutch 120 is in an off state. When the crankshaft 130 rotates, it moves the slide 180 up and down via the connecting rod 135 . Brake 140 is a mechanical element that allows or prevents rotation of crankshaft 130. The crown 150 , the press frame 160 , and the bed 170 form the basic structure of the press machine 100 . The bolster 190 is fixed to the bed 170 . The slide 180 is guided by the press frame 160 so as to be vertically movable.

[0037] The material supply device 200 is composed of a material 210, a material sensor 220, an uncoiler 230, a coil material 240, and a winder 250. Material 210 is the material that is processed by the press. The material 210 is wound into a coil to form the coil material 240 . The material sensor 220 is a sensor that detects whether or not the material 210 is set in the press machine. The uncoiler 230 is a mechanism that unwinds the material 210 from the coil material 240 . The winding 250 is a mechanism for winding up the material 210 remaining after the pressing.

[0038] The mold 600 is composed of an upper mold 610 and a lower mold 620 . The upper mold 610 is fixed to the slide 180 . The lower mold 620 is fixed to the bolster 190 . The scrap recovery device 350 is a device that collects scrap produced by pressing using the die 600 and guides it to the pneumatic conveying system 300 . For example, the scrap recovery device 350 is a hopper.

[0039] The gas conveying system 300 is comprised of a blower 310 , an ejector 320 , conveying piping 330 and a terminal 340 . When the blower 310 blows gas into the ejector 320 , the gas flows into the conveying pipe 330 . A terminal 340 is connected to the end of the conveying pipe 330 . The scrap 400 falls into the scrap recovery device 350 , flows through the transport pipe 330 along with the transport gas, and is collected at the terminal 340 .

[0040] The control device 500 controls the press working system. The control device is composed of a computer, an operation panel, and control software. The control software controls the press 100 and the pneumatic conveying system 300 in accordance with operating parameters entered into the operation panel by an operator. The control software implements receiving and control functions for the pneumatic transport system. The control software may cause the pneumatic delivery system to perform receiving, system checking and control functions. The receiving function is a function that executes a receiving function described later. The system check function is a function for executing a system check process, which will be described later. The control function is a function for executing a control process, which will be described later.

[0041] The operation of the press working system according to the embodiment of the present invention will be described below. FIG. 2 is a conceptual diagram of the operation of the press working system according to the embodiment of the present invention. First, the press machine is started. Check that the motor starts. (Motor starts OK) Check that the crankshaft angle is correct. (Crankshaft angle OK) Check that the hydraulic and pneumatic pressures are appropriate (oil and pneumatic pressure OK) Check that the die is clamped properly. (Die clamp OK) Make sure that the pneumatic conveying system 300 is set up properly (scrap processing equipment OK). For example, select the set speed according to the bulk density and amount of scrap generated. Verify that the material feeder is set up properly. (Material feeder OK) Check that the safety devices are set properly. (Safety devices OK) When the emergency stop button is not pressed, the press is ready for operation. (Press operation ready) When the emergency stop button is pressed and held, resetting the emergency stop condition will release the emergency stop. (Emergency stop condition reset)

[0042] Next, the pneumatic conveying system is optimally controlled. Switches the operation mode. (Operation switch button) The operating mode is set to either continuous or intermittent operation. Set the operation mode to continuous operation. (Continuous operation) When the operation start button is pressed (continuous operation button), a continuous operation command is issued (continuous operation command), and a steady operation command is issued to the gas conveying system. (Steady operation control of the gas conveying system) The steady operation command for the pneumatic conveying system is issued by combining a clutch continuous operation command, a motor continuous operation command, and a material supply continuous operation command. Set the operation mode to intermittent operation (intermittent operation) When the intermittent operation button is pressed (intermittent operation button), a unit process operation command and an inching operation command are issued, and a non-steady operation command for the gas conveying system is issued. (Non-steady operation control of the gas conveying system) The non-steady operation command of the pneumatic conveying system is issued by combining a clutch intermittent operation command, a motor intermittent operation command, and a material supply intermittent operation command.

[0043] During the above operations, two types of control are possible. In the first type, the pneumatic conveying system is optimally controlled based on the operating state determined by the control command of the press device. In the second type, the pneumatic conveying system is optimally controlled based on the operating conditions judged based on the operating signals of the clutch and material supply. For example, a driving condition of a first type corresponds to a driving situation of a second type.

[0044] First, an overview of the operation control of the press machine will be described. The clutch state changes between on and off. When the clutch is in the on state, the clutch transmits the rotation of the press motor to the crankshaft. When the clutch is in the off state, the clutch does not transmit the rotation of the press motor to the crankshaft.

[0045] When the clutch is turned on, the press motor rotates and the press machine continuously presses the material and discharges scrap. For example, when the clutch is turned on, the press machine continuously presses the material and discharges scrap.

[0046] For example, when the press motor is rotating and a material is set in the press machine, as a result, when the clutch is turned on, the press motor rotates and the press machine continuously presses the material and discharges scrap. For example, the press motor may not rotate or the material may not be set in the press machine, and as a result, even if the clutch is turned on, the press machine will not press the material. When the material status is on, the material 210 is loaded into the press. When the material status is off, the material 210 is not loaded into the press. For example, the material sensor 220 determines whether or not a press is set.

[0047] The press machine outputs an operation start signal, an operation mode signal, and a press operation preparation signal to the pneumatic conveying system. For example, an operation start button, an operation stop button, and an operation mode selection switch are provided on the control panel surface of the press machine. When the operation start button is pressed, the press machine starts operating and the operation start signal turns ON. When the operation stop button is pressed, the press machine will not operate or will stop operating, and the operation start signal will be turned OFF. Therefore, when the operation start signal is ON, it means that the press machine is operated, and when the operation start signal is OFF, it means that the press machine is not operated.

[0048] The operation mode selection switch is a switch that allows selection between continuous operation and intermittent operation. The operation mode signal is a signal that changes between a continuous operation mode and an intermittent operation mode. When continuous operation is selected with the operation mode selection switch, the output operation mode signal is in continuous operation mode. When intermittent operation is selected with the operation mode selection switch, the output operation mode signal is in the intermittent operation mode. Therefore, when the operation mode signal is in the continuous operation mode, this means that the press machine is operated continuously and is operating while continuously discharging scrap, and when the operation mode signal is in the intermittent operation mode, this means that the press machine is operating without discharging scrap or while intermittently discharging scrap.

[0049] The press operation preparation signal changes between press operation preparation OK and press operation preparation NG. When the system check confirms that the press processing machine is functioning normally, the press operation ready signal is set to press operation ready OK. When the system check does not confirm that the press processing machine is functioning normally, the press operation preparation signal is set to press operation preparation NG. For example, as shown in Figure 2, the system checks whether the motor start, crankshaft angle, chip processing device, material supply device, safety device, hydraulic and pneumatic pressure, die clamp, and emergency stop button are functioning normally. Therefore, when the press operation ready signal indicates that the press operation is ready, it means that the system check has confirmed that the pneumatic conveying system is functioning normally. When the press operation preparation signal indicates "press operation preparation NG", it means that it has not been confirmed that the pneumatic conveying system is functioning normally.

[0050] The velocity of the carrier gas is varied between zero, standby, cleaning and set speeds. FIG. 7 illustrates a selection rate table for a pneumatic conveying system according to an embodiment of the present invention. Zero speed is a wind speed at or near zero. The standby speed is zero or a slight wind speed. The standby speed may correspond to zero speed. The set speed corresponds to the bulk density and amount of scrap generated and is the wind speed at which the scrap can be transported efficiently. One set speed is selected from multiple set speeds according to the bulk density and amount of scrap generated. When the velocity of the carrier gas is set to a set velocity, the velocity of the carrier gas is set to one preset velocity among a plurality of set velocities. The cleaning velocity is a velocity sufficient to transport accumulated scrap in the pneumatic transport system. The standby speed is slower than the set speed. The set speed is slower than the cleaning speed. For example, the blower 310 is frequency-controlled by an inverter, and the velocity of the carrier gas is a velocity corresponding to the frequency.

[0051] The method of operation of the pneumatic conveying system is described below. FIG. 4 is a state transition diagram of the gas conveying system according to the embodiment of the present invention. 4 to 6 are schematic diagrams of a method of operating a pneumatic conveying system according to an embodiment of the present invention. The method of operating a gas conveying system according to an embodiment of the present invention includes a receiving step, a system check step, and a control step. The receiving process, the system check process, and the control process are repeatedly executed, and when a predetermined condition is satisfied, the state in which the velocity of the carrier gas is a predetermined velocity is transitioned to a state in which the velocity of the carrier gas is another predetermined velocity.

[0052] The receiving step is a step of receiving an operation start signal and an operation mode signal from the press machine. The receiving step may be a step of receiving an operation start signal, an operation mode signal, and a press operation preparation signal from the press machine. The start signal changes between ON and OFF. This means that the press machine will operate when the operation start signal is ON. This means that the press machine will not operate when the operation start signal is OFF. The operating mode signal changes between a continuous operating mode and an intermittent operating mode. When the operation mode signal is in the continuous operation mode, it means that the press machine is in a state where it operates by continuously discharging scrap. For example, when the operation mode signal is in the intermittent operation mode, materials are set in the press machine, the press machine operates continuously, and the press machine continuously discharges scrap. When the operation mode signal indicates the intermittent operation mode, it means that the press machine is in a state of operation without discharging scrap or with discharging scrap intermittently. For example, when the operation mode signal is in the intermittent operation mode, the press machine operates intermittently and the press machine discharges scrap intermittently. For example, when the operation mode signal is in the intermittent operation mode, the press machine is idled without being supplied with material, and the press machine intermittently discharges scrap. For example, when the operation mode signal is in the intermittent operation mode, the press machine can be operated intermittently to perform die replacement, timing adjustment, and the like. The press operation ready signal changes between press operation ready OK and press operation ready NG. When the press operation ready signal is "Press operation ready OK", it means that the system check has confirmed that the pneumatic conveying system is functioning normally. When the press operation preparation signal indicates "press operation preparation NG", it means that it has not been confirmed that the pneumatic conveying system is functioning normally.

[0053] The system check step is a step of generating a transport system preparation signal. The transport system ready signal changes between transport system ready OK and transport system not ready. When the system check confirms that the function of the transport system ready signal is normal, the transport system ready signal is set to transport system ready OK. Therefore, when the transport system ready signal indicates that the transport system is ready, this means that the system check has confirmed that the transport system ready signal is functioning normally. When the system check does not confirm that the function of the transport system preparation signal is normal, the transport system preparation signal is set to transport system preparation NG. Therefore, when the transport system preparation signal indicates that the transport system is not ready, this means that the function of the transport system preparation signal has not been confirmed to be normal by a system check. The system check process may be capable of detecting abnormalities in the pneumatic conveying system. For example, the system check process detects a failure of an inverter as an abnormality. For example, the system check process detects clogging of the pneumatic conveying system as an abnormality.

[0054] The control process is a process of setting the velocity of the carrier gas to one of zero speed, standby speed, one or more set speeds, and cleaning speed in response to a combination of ON / OFF of the operation start signal and continuous operation mode / intermittent operation mode of the operation mode signal. The control process may set the velocity of the conveying gas to one of zero speed, standby speed, one or more set speeds, and cleaning speed in response to a combination of ON / OFF of the operation start signal, continuous operation mode / intermittent operation mode of the operation mode signal, press operation preparation signal (press operation ready OK / press operation not ready), and conveying system preparation signal (conveying system ready OK / conveying system not ready). The control process may set the speed of the conveying gas to one of zero speed, standby speed, one or more set speeds, and cleaning speed in response to a combination of ON / OFF of the operation start signal, continuous operation mode / intermittent operation mode of the operation mode signal, press operation preparation OK / press operation preparation NG of the press operation preparation signal, conveying system preparation OK / conveying system preparation NG of the conveying system preparation signal, and the presence or absence of a system abnormality.

[0055] The control process may be composed of a start routine, a standby routine A, a continuous / intermittent transport routine B, a standby end routine C, a cleaning routine D, an intermittent transport standby routine E, a continuous transport standby routine F, a cleaning end routine G, an intermittent transport stop routine H1, abnormality stop routines H2, H3, and a standby continuation routine I. Each routine determines whether a predetermined condition is met, and when it is determined that the predetermined condition is met, transitions the carrier gas velocity from a state in which the carrier gas velocity is a predetermined velocity to a state in which the carrier gas velocity is another predetermined velocity.

[0056] First, when the control device is started, a start routine is executed. When the start routine is executed, the velocity of the carrier gas is at zero. For example, the start routine consists of a zero speed setting S110. The zero speed setting S110 is a process for setting the speed of the carrier gas to zero.

[0057] The standby routine A is a routine for transitioning the carrier gas velocity from a state in which the velocity of the carrier gas is zero to a state in which the velocity of the carrier gas is at a standby velocity. When a predetermined condition is satisfied while the velocity of the carrier gas is zero, the velocity of the carrier gas is changed from zero to a standby velocity. When the speed of the conveying gas is zero, the press operation preparation signal indicates that the press operation is ready, and the conveying system preparation signal indicates that the conveying system is ready, the speed of the conveying gas may be changed from zero to the standby speed. For example, the standby routine A is made up of a transfer system preparation signal ? S120, a press operation preparation signal ? S130, and a standby speed setting S140. When the zero speed setting S110 executed by the start routine is completed, the conveyance system preparation signal ? S120 is executed. The transport system ready signal step S120 is a step of waiting for the transport system ready signal to become the transport system ready OK. When it is confirmed that the transfer system preparation signal is ready for the transfer system, the press operation preparation signal S130 is executed. The press operation ready signal S130 is a process of waiting for the press operation ready signal to indicate that the press operation is ready. When the press operation preparation signal indicates that the press operation is ready, the standby speed setting S140 is executed. The standby speed setting S140 is a step of setting the speed of the carrier gas to the standby speed. When the standby speed setting S140 is executed, the speed of the carrier gas is changed from a state in which the speed of the carrier gas is zero speed to a state in which the speed of the carrier gas is the standby speed.

[0058] The continuous / intermittent transport routine B is a routine for transitioning from a state in which the velocity of the carrier gas is at the standby velocity to a state in which the velocity of the carrier gas is at the set velocity. When the speed of the carrier gas is at the standby speed and an operation start signal is ON, the speed of the carrier gas is changed from the standby speed to a set speed, and otherwise the speed of the carrier gas is changed to one of zero speed, standby speed, and cleaning speed depending on the situation. For example, the continuous / intermittent conveying routine B is made up of a rise time of N seconds (S210), an operation mode signal (S220), an operation start signal (S231, S232), and a set speed setting signal (S241, S242). Rise time N seconds - S210 is a process of waiting for a certain period of time (N seconds) to elapse. For example, N seconds is 7 seconds. After executing S210 at N seconds after the start of the signal, the operation mode signal S220 is executed. Operation mode signal? S220 is a step of confirming the operation mode signal. When the operation mode signal is in the continuous operation mode, the operation start signal S231 is executed. The operation start signal S231 is executed, and when the operation start signal is ON, the set speed setting S241 is executed. Setting the set speed S241 is a process for setting the speed of the carrier gas to the set speed. When the operation mode signal is in the intermittent operation mode, the operation start signal S232 is executed. The operation start signal S232 is executed, and when the operation start signal is ON, the set speed setting S242 is executed. Setting the set speed S242 is a step of setting the speed of the carrier gas to a set speed. When the set speed setting S241 or the set speed setting S242 is executed, the speed of the carrier gas transitions from the standby speed to the set speed.

[0059] The standby end routine C is a routine for transitioning the carrier gas velocity from a state in which the velocity of the carrier gas is at the standby velocity to a state in which the velocity of the carrier gas is at zero velocity. When the operation start signal is OFF while the velocity of the carrier gas is at the standby velocity, the velocity of the carrier gas is changed from the standby velocity to zero velocity. When the speed of the carrier gas is at the standby speed, the operation mode signal is in the continuous operation mode or the intermittent operation mode, and the operation start signal is OFF, the speed of the carrier gas is changed from the standby speed to zero speed. When the velocity of the conveying gas is at the standby speed, the operation mode signal is in the continuous operation mode or the intermittent operation mode, the operation start signal is OFF, the press operation preparation signal is in the press operation preparation NG state, or the conveying system preparation signal is in the conveying system preparation NG state, the velocity of the conveying gas may be changed from the standby speed to zero speed. For example, the standby end routine C is made up of a rising edge N seconds S210, an operation mode signal S220, operation start signals S231, S232, a transfer system preparation signal S710, and a press operation preparation signal S720. The rising edge N seconds S210, the operation mode signal S220, and the operation start signals S231 and S232 are the same as those described above, so the explanation will be omitted. When the transport system preparation signal? S710 is executed to confirm that the transport system preparation signal is in the transport system preparation NG state, or the press operation preparation signal? S720 is executed to confirm that the press operation preparation signal is in the press operation preparation signal NG state, the zero speed setting S110 is executed. When the zero speed setting S110 is executed, the speed of the carrier gas is transitioned from the standby speed to a zero speed.

[0060] The standby continuation routine I is a routine for maintaining the state in which the velocity of the carrier gas is at the standby speed. When the operation start signal is OFF while the velocity of the carrier gas is at the standby velocity, the velocity of the carrier gas is maintained at the standby velocity. When the operation mode signal is in the continuous operation mode or the intermittent operation mode and the operation start signal is OFF while the velocity of the carrier gas is at the standby velocity, the velocity of the carrier gas is maintained at the standby velocity. When the velocity of the conveying gas is at the standby speed, the operation mode signal is in the continuous operation mode or the intermittent operation mode, the operation start signal is OFF, the press operation preparation signal indicates that the press operation is ready, and the conveying system preparation signal indicates that the conveying system is ready, the velocity of the conveying gas may be maintained at the standby speed. For example, the standby continuation routine I is made up of a rising N seconds signal S210, an operation mode signal S220, operation start signals S231 and S232, a transfer system preparation signal S710, and a press operation preparation signal S720. The rising edge N seconds S210, the operation mode signal S220, and the operation start signals S231 and S232 are the same as those described above, so the explanation will be omitted. The conveying system preparation signal ? S710 is executed to confirm that the conveying system preparation signal is OK for the conveying system, and the press operation preparation signal ? S720 is executed to confirm that the press operation preparation signal is OK for the press operation preparation signal, and then the operation mode signal ? S220 is executed.

[0061] The cleaning routine D is a routine for transitioning from a state in which the velocity of the carrier gas is at a set velocity to a state in which the velocity of the carrier gas is at a cleaning velocity. When the speed of the carrier gas is at the set speed, the operation mode signal is in the continuous operation mode, and the operation start signal is OFF, the speed of the carrier gas is changed from the set speed to the cleaning speed. When the velocity of the carrier gas is at the set velocity, the operation mode signal is in the continuous operation mode, the press operation preparation signal indicates that the press operation is ready and the operation start signal is OFF, or the press operation preparation signal indicates that the press operation is not ready, the velocity of the carrier gas may be changed from the set velocity to the cleaning velocity. For example, cleaning routine D is made up of a transfer system abnormality signal S310, a press operation preparation signal S320, an operation start signal S330, and a cleaning speed setting S340. Transport system abnormality? S310 is a process to determine whether or not there is an abnormality in the transport system (YES / NO). The transfer system abnormality check S310 is executed, and if it is determined that there is no transfer system abnormality (NO), the press operation preparation signal S320 is executed. The press operation preparation signal? S320 is a process for determining whether the press operation preparation signal indicates that the press operation is ready or not. A press operation preparation signal S320 is executed, and when the press operation preparation signal indicates that press operation is ready, an operation start signal S330 is executed, and when the press operation preparation signal indicates that press operation is not ready, a cleaning speed setting S340 is executed. Operation start signal - S330 is a process for checking whether the operation start signal is ON / OFF. The operation start signal S330 is executed, and when the operation start signal is OFF, the cleaning speed setting S340 is executed, and when the operation start signal is ON, the flow returns to the step immediately after the set speed setting S241 and the set speed is maintained. The cleaning speed setting S340 is a process for setting the speed of the carrier gas to a cleaning speed. By executing the cleaning speed setting S340, the speed of the carrier gas is transitioned from a state in which the speed is the set speed to a state in which the speed of the carrier gas is the cleaning speed.

[0062] The intermittent transport standby routine E is a routine for transitioning the state in which the velocity of the carrier gas is at a set velocity to a state in which the velocity of the carrier gas is at a standby velocity. When the speed of the carrier gas is at the set speed, the operation mode signal is in the intermittent operation mode, and the operation start signal is ON, the speed of the carrier gas is changed from the standby speed to the set speed when a certain time T2 has elapsed since the speed of the carrier gas was changed from the standby speed to the set speed. When the velocity of the conveying gas is at the set speed, the operation mode signal is in the intermittent operation mode, the press operation preparation signal indicates press operation preparation OK, and the operation start signal is ON, the velocity of the conveying gas may be changed from the set speed to the standby speed when a certain time T2 has elapsed since the velocity of the conveying gas was changed from the standby speed to the set speed. For example, the intermittent transfer standby routine E is made up of a timer T2ONS510, a press operation preparation signal ?S520, an operation start signal ?S530, a transfer system abnormality ?S540, and T2>X2 ?S550. Timer T2ONS 510 is a process for setting timer T2. For example, timer T2 is set to X2. The press operation preparation signal? S520 is a process for checking whether the press operation preparation signal indicates that the press operation is ready or not. The press operation preparation vibration S520 is executed, and when the press operation preparation signal indicates that the press operation preparation is OK, the operation start signal S530 is executed, and when the press operation preparation signal indicates that the press operation preparation is OFF, the timer T3ONS610 is executed. Operation start signal - S530 is a process for checking whether the operation start signal is ON / OFF. The operation start signal S530 is executed, and when the operation start signal is ON, the transport system abnormality S540 is executed, and when the operation start signal is OFF, the timer T3ONS610 is executed. Transport system abnormality? S540 is a process to determine whether or not there is an abnormality in the transport system (YES / NO). Is there an abnormality in the transport system? S540 is executed, and if it is determined that there is no abnormality in the transport system (NO), T2>X2? S550 is executed, and if it is determined that there is an abnormality in the transport system (YES), zero speed setting S110 is executed and abnormal stop S820 is executed. Conveying system abnormality? S540 is executed, and if it is determined that there is no abnormality in the conveying system (NO), T2>X2? S550 is executed, and if it is determined that there is an abnormality in the conveying system (YES), zero speed setting S110 and abnormal stop S820 are executed. T2>X2?S550 is a process of waiting for timer T2 to time out. T2>X2? S550 is executed, and when it is confirmed that the timer T2 has timed out, the process returns to point Y and the standby speed setting S110 is executed. By executing the standby speed setting S110, the speed of the carrier gas is transitioned from a state in which the speed of the carrier gas is the set speed to a state in which the speed of the carrier gas is the standby speed.

[0063] The intermittent transport standby routine E may be a routine for transitioning from a state in which the velocity of the transport gas is a set velocity to a state in which the velocity of the transport gas is zero velocity. The above-described intermittent transport standby routine E is the same as the above-described intermittent transport standby routine E, except that the "state in which the velocity of the transport gas is the standby velocity" is replaced with the "state in which the velocity of the transport gas is zero velocity".

[0064] The continuous transport standby routine F is a routine for transitioning from a state in which the velocity of the transport gas is at the cleaning speed to a state in which the velocity of the transport gas is at the standby speed. When the velocity of the carrier gas is at the cleaning speed, and a certain time T1 has elapsed since the velocity of the carrier gas has changed from the set speed to the cleaning speed, the velocity of the carrier gas is changed from the cleaning speed to the standby speed. When the speed of the conveying gas is at the cleaning speed, when a certain time T1 has elapsed since the speed of the conveying gas changed from the set speed to the cleaning speed, if the press operation preparation signal indicates that press operation is ready and the conveying system preparation signal indicates that the conveying system is ready, the speed of the conveying gas may be changed from the cleaning speed to the standby speed. For example, the continuous transfer standby routine F is made up of a timer T1ONS410, T1>X1?S420, a transfer system preparation signal?S430, and a press operation preparation signal?S440. Timer T1ONS 410 is a process for setting timer T1. For example, timer T1 is set to X1. T1>X1?S420 is a process of waiting for timer T1 to time out. T1>X1? S420 is executed, and when it is confirmed that the timer T1 has timed out, a transport system preparation signal? S430 is executed. The transport system preparation signal S430 is a process for confirming whether the transport system preparation signal indicates that the transport system is ready or not. The transfer system preparation signal S430 is executed, and if it is confirmed that the transfer system preparation signal indicates that the transfer system is ready, the press operation preparation signal D440 is executed, and if it is confirmed that the transfer system preparation signal indicates that the transfer system is not ready, the process moves to point X. The press operation preparation signal? S440 is a process for checking whether the press operation preparation signal indicates that the press operation is ready or not. Press operation preparation signal? S440 is executed, and when it is confirmed that the press operation preparation signal indicates that press operation is ready, the process moves to point Y and standby speed setting S140 is executed. By executing the standby speed setting S140, the speed of the carrier gas is transitioned from the cleaning speed to the standby speed.

[0065] The cleaning end routine G is a routine for transitioning from a state in which the velocity of the carrier gas is the cleaning speed to a state in which the velocity of the carrier gas is zero speed. When the velocity of the carrier gas is at the cleaning speed, and a certain time T1 has elapsed since the velocity of the carrier gas changed from the set velocity to the cleaning speed, the velocity of the carrier gas is changed from the cleaning speed to zero velocity. When the speed of the conveying gas is at the cleaning speed, the speed of the conveying gas may be changed from the cleaning speed to zero speed when a certain time T1 has elapsed since the speed of the conveying gas changed from the set speed to the cleaning speed and the press operation preparation signal indicates that the press operation is not ready, or when the conveying system preparation signal indicates that the conveying system is not ready. For example, the cleaning end routine G is made up of a timer T1ONS410, T1>X1?S420, a transfer system preparation signal?S430, and a press operation preparation signal?S440. The timer T1ONS410, T1>X1?S420, the transfer system preparation signal?S430, and the press operation preparation signal?S440 are the same as those explained in the continuous transfer standby routine F, so the explanation will be omitted. The transport system preparation signal S430 is executed, and if it is confirmed that the transport system preparation signal indicates that the transport system is not ready, the process proceeds to point X. Press operation preparation signal? S440 is executed, and if it is confirmed that the press operation preparation signal indicates that press operation is not ready, the process moves to point X. Moving to point X causes a transition from a state in which the carrier gas velocity is at the cleaning velocity to a state in which the carrier gas velocity is at zero velocity.

[0066] The intermittent transport stop routine H1 is a routine for transitioning the state in which the velocity of the transport gas is a set velocity to a state in which the velocity of the transport gas is zero velocity. When the speed of the carrier gas is at a set speed, the operation mode signal is in intermittent operation mode, and the operation start signal is OFF, the speed of the carrier gas is changed from the set speed to zero speed when a certain time T3 has elapsed since the speed of the carrier gas was set to the set speed. When the velocity of the conveying gas is at the set speed, the operation mode signal is in the intermittent operation mode, the press operation preparation signal indicates press operation preparation NG, or the operation start signal is OFF, the velocity of the conveying gas may be changed from the set speed to zero speed when a certain time T3 has elapsed since the velocity of the conveying gas was changed from the standby speed to the set speed. For example, the intermittent transport stop routine H1 is made up of a timer T2ONS510, a press operation preparation signal D520, an operation start signal D530, and timers T3ONS610 and T3>X3D620. The timer T2ONS 510, the press operation preparation signal ?S 520 and the operation start signal D 530 have been described above and the rest are the same as above, so the description will be omitted. The press operation preparation signal ? S520 is executed and it is confirmed that the press operation preparation signal is not ready for press operation, or the operation start signal ? S530 is executed and when it is confirmed that the operation start signal is OFF, the timer T3ONS 610 is executed. Timer T3ONS 610 is a process for setting timer T3. Timer T3 is set to X3 seconds. Timer T3-S630 is executed, and when timer T3 times out, the process moves to point X. When the system moves to point X, the zero speed setting S110 is executed. When the zero speed setting S110 is executed, the speed of the carrier gas is changed from a state in which the speed of the carrier gas is the set speed to a state in which the speed of the carrier gas is zero speed.

[0067] The abnormality stop routine H2 is a routine for transitioning the velocity of the carrier gas from a state in which the velocity of the carrier gas is a set velocity to a state in which the velocity of the carrier gas is zero velocity. When the speed of the carrier gas is at a set speed, the operation mode signal is in continuous operation mode, and an abnormality in the gas carrier system is detected, the speed of the carrier gas is changed from the set speed to zero speed, abnormality stop processing is performed, and then control is stopped. With the velocity of the carrier gas at a set velocity, the operation mode signal may be in a continuous operation mode, and when an abnormality in the gas transport system is detected, the velocity of the carrier gas may be changed from the set velocity to zero velocity. When the speed of the conveying gas is at the set speed, the operation mode signal is in continuous operation mode, the operation start signal is ON, and an abnormality in the gas conveying system is detected, the speed of the conveying gas is changed from the set speed to zero speed, abnormality stop processing is performed, and control is stopped. For example, when the inverter outputs an abnormality signal or the conveying system detects a blockage, an abnormality in the pneumatic conveying system is detected. The abnormality stop routine H2 is composed of a conveying system abnormality check S310, a zero speed setting S110, and an abnormality stop S810. Transport system abnormality? S310 is the same as that described above, so the explanation will be omitted. Conveying system abnormality? S310 is executed, and if an abnormality in the gas conveying system is detected, zero speed setting S110 and abnormality stop S810 are executed. Zero speed setting S110 is executed, and abnormal stop S810 is executed. In the abnormal stop S810, the pneumatic conveying system is abnormally stopped, for example, by stopping the inverter that controls the blower. When the zero speed setting S110 is executed, the speed of the carrier gas is changed from a state in which the speed of the carrier gas is the set speed to a zero speed.

[0068] The abnormality stop routine H3 is a routine for transitioning the velocity of the carrier gas from a state in which the velocity of the carrier gas is a set velocity to a state in which the velocity of the carrier gas is zero velocity. When the speed of the carrier gas is at a set speed and the operation mode signal indicates an intermittent operation mode, if an abnormality in the gas conveying system is detected, the speed of the carrier gas is changed from the set speed to zero speed. When the speed of the conveying gas is at the set speed, the operation mode signal is in intermittent operation mode, the operation start signal is ON, and an abnormality in the gas conveying system is detected, the speed of the conveying gas is changed from the set speed to zero speed, abnormality stop processing is performed, and then control is stopped. When the speed of the conveying gas is at a set speed, the operation mode signal is in the intermittent operation mode, the press operation preparation signal indicates that press operation is ready, the operation start signal is ON, and an abnormality in the gas conveying system is detected, the speed of the conveying gas may be changed from the set speed to zero speed. For example, when the inverter outputs an abnormality signal or the conveying system detects a blockage, an abnormality in the pneumatic conveying system is detected. For example, the abnormality stop routine H3 is composed of a timer T2ONS510, a press operation preparation signal ?S520, an operation start signal ?S530, a conveying system abnormality ?S540, a zero speed setting S110, and an abnormality stop S810. The timer T2ONS510, the press operation preparation signal S520, the operation start signal S530, and the transport system abnormality S540 are the same as those described above, so their explanation will be omitted. Conveying system abnormality? S5400 is executed, and if an abnormality in the gas conveying system is detected, zero speed setting S110 and abnormality stop S820 are executed. Zero speed setting S110 is executed, and abnormal stop S810 is executed. In the abnormal stop S820, the gas conveying system is abnormally stopped, for example, by stopping the inverter that controls the blower. When the zero speed setting S110 is executed, the speed of the carrier gas is changed from a state in which the speed of the carrier gas is the set speed to a zero speed.

[0069] As described above, the use of the method for operating the gas conveying system according to the embodiment of the present invention has the following advantages. The speed of the conveying gas is set to one of zero speed, standby speed, set speed, and cleaning speed according to the combination of ON / OFF of the operation start signal and the continuous operation mode / intermittent operation mode of the operation mode signal, so that the gas conveying system can be optimally controlled according to the state of the press machine. The speed of the conveyed gas is set to one of zero speed, standby speed, set speed, and cleaning speed in response to the combination of the operation start signal (ON / OFF), the operation mode signal (continuous operation mode / intermittent operation mode), the press operation preparation signal (press operation ready OK / press operation not ready), and the gas conveying system standby signal (gas conveying system standby ready OK / gas conveying system standby not ready), so that the gas conveying system can be optimally controlled according to the state of the press machine and the state of the gas conveying system. When the press operation ready signal indicates that the press is ready for operation and the gas conveying system standby signal indicates that the gas conveying system is ready for standby, the speed of the conveyed gas is changed from zero speed to the standby speed, so that the gas conveying system can be optimally controlled according to the state of the press machine and the state of the gas conveying system. When the operation start signal is ON while the speed of the conveying gas is at the standby speed, the speed of the conveying gas is changed from the standby speed to the set speed, and at other times the speed of the conveying gas is set to one of zero speed, standby speed, or cleaning speed depending on the situation, so that the gas conveying system can be optimally controlled according to the state of the press processing machine. When the speed of the conveying gas is at the set speed, the operation mode signal is in the continuous operation mode, and the operation start signal is OFF, the speed of the conveying gas is changed from the set speed to the cleaning speed, so that the gas conveying system can be optimally controlled according to the state of the press processing machine. When the speed of the conveying gas is at the set speed, the operation mode signal is in the continuous operation mode, the press operation preparation signal indicates that press operation is ready and the operation start signal is OFF, or the press operation preparation signal indicates that press operation is not ready, the speed of the conveying gas is changed from the set speed to the cleaning speed, so that the gas conveying system can be optimally controlled according to the state of the press processing machine. When the speed of the carrier gas is at the cleaning speed, and a certain time T1 has elapsed since the speed of the carrier gas changes from the set speed to the cleaning speed, the speed of the carrier gas is changed from the cleaning speed to one of the standby speed or zero speed, so that the gas carrier system can be optimally controlled according to the state of the press machine. When the speed of the conveying gas is at the cleaning speed, when a certain time T1 has elapsed since the speed of the conveying gas changed from the set speed to the cleaning speed, if the press operation preparation signal indicates that press operation is ready and the gas conveying system standby signal indicates that the gas conveying system is ready to standby, the speed of the conveying gas is changed from the cleaning speed to one of the standby speed or zero speed, so that the gas conveying system can be optimally controlled according to the state of the press machine. When the speed of the carrier gas is at the cleaning speed and a certain time T1 has elapsed since the speed of the carrier gas changes from the set speed to the cleaning speed, the speed of the carrier gas is changed from the cleaning speed to the standby speed, so that the gas carrier system can be optimally controlled according to the state of the press machine. When the speed of the conveying gas is at the cleaning speed, when a certain time T1 has elapsed since the speed of the conveying gas changed from the set speed to the cleaning speed, if the press operation preparation signal indicates that press operation is ready and the gas conveying system standby signal indicates that the gas conveying system is ready to standby, the speed of the conveying gas is changed from the cleaning speed to the standby speed, so that the gas conveying system can be optimally controlled according to the state of the press processing machine. When the speed of the carrier gas is at the cleaning speed, and a certain time T1 has elapsed since the speed of the carrier gas changes from the set speed to the cleaning speed, the speed of the carrier gas is changed from the cleaning speed to zero speed, so that the gas carrier system can be optimally controlled according to the state of the press machine. When the speed of the conveying gas is at the cleaning speed, if a certain time T1 has elapsed since the speed of the conveying gas changed from the set speed to the cleaning speed and the press operation preparation signal indicates that the press operation is not ready, or if the gas conveying system standby signal indicates that the gas conveying system is not ready to wait, the speed of the conveying gas is changed from the cleaning speed to zero speed, so that the gas conveying system can be optimally controlled according to the state of the press machine. When the speed of the conveying gas is at the set speed, the operation mode signal is in the intermittent operation mode, and the operation start signal is ON, the speed of the conveying gas is changed from the set speed to the standby speed when a certain time T2 has elapsed since the speed of the conveying gas was changed from the standby speed to the set speed, so that the gas conveying system can be optimally controlled according to the state of the press machine. When the speed of the conveying gas is at the set speed, the operation mode signal is in the intermittent operation mode, the press operation preparation signal indicates that press operation is ready, and the operation start signal is ON, the speed of the conveying gas is changed from the set speed to the standby speed when a certain time T2 has elapsed since the speed of the conveying gas was changed from the standby speed to the set speed, so that the gas conveying system can be optimally controlled according to the state of the press machine. When the speed of the conveying gas is at the set speed, the operation mode signal is in the intermittent operation mode, and the operation start signal is OFF, the speed of the conveying gas is changed from the set speed to zero speed when a certain time T3 has elapsed since the speed of the conveying gas was set to the set speed, so that the gas conveying system can be optimally controlled according to the state of the press machine. When the speed of the conveying gas is at the set speed, the operation mode signal is in the intermittent operation mode, the press operation preparation signal indicates that press operation is not ready, or the operation start signal is OFF, the speed of the conveying gas is changed from the set speed to zero speed after a certain time T3 has elapsed since the speed of the conveying gas was set to the set speed, so that the gas conveying system can be optimally controlled according to the state of the press machine. When the speed of the conveying gas is at the set speed, the operation mode signal is in continuous operation mode, the operation start signal is ON, and an abnormality in the gas conveying system is detected, the speed of the conveying gas is changed from the set speed to zero speed, and control is stopped after the abnormality stop processing is performed, so that the gas conveying system can be optimally controlled according to the condition of the press processing machine. When the speed of the conveying gas is at the set speed, the operation mode signal is in the intermittent operation mode, the operation start signal is ON, and an abnormality in the gas conveying system is detected, the speed of the conveying gas is changed from the set speed to zero speed, and control is stopped after the abnormality stop processing is performed, so that the gas conveying system can be optimally controlled according to the condition of the press processing machine. When the speed of the conveying gas is at the set speed, the operation mode signal is in the intermittent operation mode, the press operation preparation signal indicates that press operation is ready, the operation start signal is ON, and an abnormality in the gas conveying system is detected, the speed of the conveying gas is changed from the set speed to zero speed, so that the gas conveying system can be optimally controlled according to the state of the press machine. When the speed of the conveying gas is at standby speed, the operation mode signal is in continuous operation mode or intermittent operation mode, the operation start signal is OFF, the press operation preparation signal indicates press operation preparation NG, or the gas conveying system standby signal indicates gas conveying system standby preparation NG, the speed of the conveying gas is changed from the standby speed to zero speed, so that the gas conveying system can be optimally controlled according to the state of the press machine. When the speed of the conveying gas is at the standby speed, the operation mode signal is in the continuous operation mode or the intermittent operation mode, the operation start signal is OFF, the press operation preparation signal indicates that press operation is ready, and the gas conveying system standby signal indicates that the gas conveying system is ready for standby, the speed of the conveying gas is maintained at the standby speed, so that the gas conveying system can be optimally controlled according to the state of the press machine.

[0070] The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the gist of the invention. [Explanation of symbols]

[0071] 100 Press Machine 110 Press motor 120 Clutch 130 Crankshaft 140 Brake 150 crowns 160 Press Frame 170 Beds 180 Slides 190 Bolster 200 Material supply device 210 Material 220 Material Sensor 230 Uncoiler 240 Coil material 250 Winding 300 Pneumatic conveying system 310 Blower 320 Ejector 330 Conveying piping 340 Terminals 350 Scrap recovery equipment 400 scrap metal 500 Control device 600 Molds 610 Upper mold 620 Lower mold A Wait Routine B Continuous / intermittent transport routine C Wait End Routine D. Cleaning Routine E Intermittent Transport Wait Routine F Continuous transport standby routine G Cleaning end routine H1 Intermittent transport stop routine H2 Abnormal stop routine H3 Abnormal stop routine I Wait and continue routine S110 Zero speed setting S120 Transport system preparation signal? S130 Press operation preparation signal? S140 Standby speed setting S210 Rise time N seconds S220 Driving mode signal? S231 Operation start signal? S232 Operation start signal? S241 Setting speed setting S242 Speed ​​setting S310 Transport system abnormality? S320 Press operation preparation signal? S330 Operation start signal? S340 cleaning speed setting S410 Timer T1ON S420 T1>X1? S440 Press operation preparation signal? S510 Timer T2ON S520 Press operation preparation signal? S540 Transport system abnormality? S550 T2>X2? S610 Timer T3ON S620 T3>X3? S710 Transport system preparation signal? S720 Press operation preparation signal? S810 Abnormal stop S820 Abnormal stop [Prior art documents] [Patent documents]

[0072] [Patent Document 1] Patent Publication 2004-002000 [Patent Document 2] Patent Publication No. 2011-213088

Claims

1. A method for operating a pneumatic conveying system in which scrap discharged from a press machine that presses a material is conveyed on a conveying gas discharged by a blower, comprising the steps of: a receiving step of receiving, from the press machine, an operation start signal that changes between ON and OFF and an operation mode signal that changes between a continuous operation mode and an intermittent operation mode; A control process for controlling the speed of the carrier gas to one of zero speed, standby speed, set speed, and cleaning speed in response to a combination of ON / OFF of the operation start signal and the continuous operation mode / intermittent operation mode of the operation mode signal. Preparation, Where: This means that the press machine will operate when the operation start signal is ON. This means that the press machine will not operate when the operation start signal is OFF. When the operation mode signal is in the continuous operation mode, it means that the press machine is in the state of operating while continuously discharging scrap, When the operation mode signal is in the intermittent operation mode, it means that the press machine is operating without discharging scrap or while discharging scrap intermittently, The velocity of the carrier gas varies between zero speed, standby speed, set speed and cleaning speed. Zero speed is a wind speed at or near zero, The standby speed is zero or slight wind speed, The set speed is the wind speed that can transport the scrap efficiently according to the bulk density and amount of scrap generated. The cleaning velocity is a velocity sufficient to transport the scrap accumulated in the pneumatic conveying system, The standby speed is slower than the set speed. The set speed is slower than the cleaning speed. A method for operating a pneumatic conveying system comprising:

2. a system check step of generating a transport system preparation signal that changes between a transport system preparation OK and a transport system preparation NG; Equipped with The receiving step receives an operation start signal, an operation mode signal, and a press operation preparation signal that changes between press operation preparation OK and press operation preparation NG from the press processing machine, the control step, when the speed of the conveying gas is zero speed, the press operation preparation signal indicates that the press operation is ready, and the conveying system preparation signal indicates that the conveying system is ready, changing the speed of the conveying gas from zero speed to a standby speed; Where: When the press operation ready signal indicates that the press operation is ready, it means that the system check has confirmed that the pneumatic conveying system is functioning normally. When the press operation preparation signal indicates that the press operation preparation is not ready, it means that the function of the gas conveying system has not been confirmed to be normal. When the transport system ready signal is in the transport system ready state, it means that the system check has confirmed that the transport system ready signal is functioning normally. When the transport system preparation signal is in the transport system preparation NG state, it means that the function of the transport system preparation signal has not been confirmed to be normal by the system check.

2. A method for operating a pneumatic conveying system according to claim 1.

3. The control step changes the speed of the carrier gas from the standby speed to a set speed when the operation start signal is ON while the speed of the carrier gas is at the standby speed, and changes the speed of the carrier gas to one of zero speed, standby speed, and cleaning speed depending on the situation in other cases.

3. A method for operating a pneumatic conveying system according to claim 2.

4. the control step changes the speed of the carrier gas from the set speed to a cleaning speed when the speed of the carrier gas is at the set speed, the operation mode signal is the continuous operation mode, the press operation preparation signal indicates that the press operation is ready and the operation start signal is OFF, or when the press operation preparation signal indicates that the press operation is not ready, 4. A method for operating a pneumatic conveying system according to claim 3.

5. the control step changes the speed of the carrier gas from the cleaning speed to one of the standby speed or zero speed when the press operation preparation signal indicates "press operation preparation OK" and the conveying system preparation signal indicates "conveying system preparation OK" when a certain time T1 has elapsed since the speed of the carrier gas has changed from the set speed to the cleaning speed while the speed of the carrier gas is at the cleaning speed; 5. A method for operating a pneumatic conveying system according to claim 4.

6. the control step is to change the speed of the carrier gas from the cleaning speed to the standby speed when the press operation preparation signal indicates that the press operation is ready and the conveying system preparation signal indicates that the conveying system is ready, when a certain time T1 has elapsed since the speed of the carrier gas is changed from the set speed to the cleaning speed while the speed of the carrier gas is at the cleaning speed; 6. A method for operating a pneumatic conveying system according to claim 5.

7. the control step changes the speed of the carrier gas from the cleaning speed to zero speed when the press operation preparation signal indicates "press operation preparation NG" or when the conveying system preparation signal indicates "conveying system preparation NG" when a certain time T1 has elapsed since the speed of the carrier gas has changed from the set speed to the cleaning speed while the speed of the carrier gas is at the cleaning speed; 7. A method for operating a pneumatic conveying system according to claim 6.

8. the control step, when the velocity of the carrier gas is at the set velocity, the operation mode signal is in the intermittent operation mode, the press operation preparation signal indicates "press operation preparation OK", and the operation start signal is ON, changing the velocity of the carrier gas from the set velocity to the standby velocity when a certain time T2 has elapsed since the velocity of the carrier gas was changed from the standby velocity to the set velocity; 8. A method for operating a pneumatic conveying system according to claim 7.

9. the control step changes the speed of the carrier gas from the set speed to zero speed when a certain time T3 has elapsed since the speed of the carrier gas was changed from the standby speed to the set speed while the speed of the carrier gas is at the set speed, the operation mode signal is in the intermittent operation mode, the press operation preparation signal is in a state of press operation preparation NG, or the operation start signal is OFF; 9. A method for operating a pneumatic conveying system according to claim 8.

10. The system check step can detect an abnormality in the gas conveying system, the control step being, when the operation mode signal is in a continuous operation mode and an abnormality in the gas conveying system is detected while the speed of the carrier gas is at a set speed, to change the speed of the carrier gas from the set speed to zero speed and to stop the control; 10. A method for operating a pneumatic conveying system according to claim 9.

11. The system check step can detect an abnormality in the gas conveying system, the control step, when the speed of the carrier gas is at a set speed, the operation mode signal is in an intermittent operation mode, the press operation preparation signal is in a press operation preparation OK state, and an abnormality in the gas carrier system is detected, changing the speed of the carrier gas from the set speed to zero speed and stopping the control; 11. A method for operating a pneumatic conveying system according to claim 10.

12. the control step changes the speed of the conveying gas from the standby speed to zero speed when the speed of the conveying gas is at the standby speed, the operation mode signal is in the continuous operation mode or the intermittent operation mode, the operation start signal is OFF, the press operation preparation signal is in a state where press operation preparation is not possible, or the conveying system preparation signal is in a state where conveying system preparation is not possible; 12. A method for operating a pneumatic conveying system according to claim 11.

13. Maintain standby speed (I) the control step, when the velocity of the conveying gas is at the standby velocity, the operation mode signal is in the continuous operation mode or the intermittent operation mode, the operation start signal is OFF, the press operation preparation signal is in the press operation preparation OK state, and the conveying system preparation signal is in the conveying system preparation OK state, maintaining the velocity of the conveying gas at the standby velocity; 13. A method of operating a pneumatic conveying system according to claim 12.

14. The control step changes the speed of the carrier gas from the standby speed to a set speed when the operation start signal is ON while the speed of the carrier gas is at the standby speed, and changes the speed of the carrier gas to one of zero speed, standby speed, and cleaning speed depending on the situation in other cases.

2. A method for operating a pneumatic conveying system according to claim 1.

15. the control step, when the speed of the carrier gas is at the set speed, the operation mode signal is in the continuous operation mode, and the operation start signal is OFF, changing the speed of the carrier gas from the set speed to a cleaning speed; 2. A method for operating a pneumatic conveying system according to claim 1.

16. the control step, when a certain time T1 has elapsed since the velocity of the carrier gas has changed from the set velocity to the cleaning velocity while the velocity of the carrier gas is at the cleaning velocity, changes the velocity of the carrier gas from the cleaning velocity to one of the standby velocity or zero velocity; 2. A method for operating a pneumatic conveying system according to claim 1.

17. the control step, when a certain time T1 has elapsed since the velocity of the carrier gas has changed from the set velocity to the cleaning velocity while the velocity of the carrier gas is at the cleaning velocity, changing the velocity of the carrier gas from the cleaning velocity to a standby velocity; 2. A method for operating a pneumatic conveying system according to claim 1.

18. the control step, when a certain time T1 has elapsed since the velocity of the carrier gas has changed from the set velocity to the cleaning velocity while the velocity of the carrier gas is at the cleaning velocity, changes the velocity of the carrier gas from the cleaning velocity to zero velocity; 2. A method for operating a pneumatic conveying system according to claim 1.

19. the control step, when the speed of the carrier gas is at the set speed, the operation mode signal is in the intermittent operation mode, and the operation start signal is ON, changing the speed of the carrier gas from the set speed to the standby speed when a certain time T2 has elapsed since the speed of the carrier gas was changed from the standby speed to the set speed; 2. A method for operating a pneumatic conveying system according to claim 1.

20. the control step, when the speed of the carrier gas is at the set speed, the operation mode signal is in the intermittent operation mode, and the operation start signal is OFF, changing the speed of the carrier gas from the set speed to zero speed when a certain time T3 has elapsed since the speed of the carrier gas was changed from the standby speed to the set speed; 2. A method for operating a pneumatic conveying system according to claim 1.

21. The system check step can detect an abnormality in the gas conveying system, The control step includes changing the speed of the carrier gas from the set speed to zero speed when the operation mode signal indicates a continuous operation mode and an abnormality in the gas conveying system is detected while the speed of the carrier gas is at the set speed.

2. A method for operating a pneumatic conveying system according to claim 1.

22. The system check step can detect an abnormality in the gas conveying system, The control step includes changing the speed of the carrier gas from the set speed to zero speed when the operation mode signal indicates an intermittent operation mode and an abnormality in the gas conveying system is detected while the speed of the carrier gas is at the set speed.

2. A method for operating a pneumatic conveying system according to claim 1.

23. The control step changes the speed of the carrier gas from the standby speed to zero speed when the operation mode signal is in the continuous operation mode or the intermittent operation mode and the operation start signal is OFF while the speed of the carrier gas is at the standby speed.

2. A method for operating a pneumatic conveying system according to claim 1.

24. The control step includes, when the speed of the carrier gas is at the standby speed, the operation mode signal is in the continuous operation mode or the intermittent operation mode, and the operation start signal is OFF, maintaining the speed of the carrier gas at the standby speed.

2. A method for operating a pneumatic conveying system according to claim 1.

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