Device, control system and control method for improving titanium alloy smelting cooling effect

Abstract

The invention discloses a control method for improving a titanium alloy smelting cooling effect, which comprises the following steps: an arc starting stage: a PLC (Programmable Logic Controller) adopts a water inlet flow control mode, so that an actual value of the water inlet flow of a smelting station is consistent with a set value of the water inlet flow of the smelting station; in the stable smelting stage, the PLC adopts an outlet water temperature control mode, so that the actual value of the outlet water temperature of the smelting station is consistent with the set value of the outlet water temperature of the smelting station; in the final melting stage, the PLC adopts a water inlet flow control mode, so that the actual value of the water inlet flow of the smelting station is consistent with the set value of the water inlet flow of the smelting station; and in the cooling stage, the PLC adopts a water outlet flow control mode, so that the actual value of the water outlet flow of the smelting station is consistent with the set value of the water outlet flow of the smelting station. According to the method, segregation is relieved or eliminated, and the uniformity of cast ingot components is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of nonferrous metal processing equipment and devices, and in particular relates to a device, a control system and a control method for improving the cooling effect of titanium alloy smelting. Background Art

[0002] Titanium alloys have been widely used in aerospace, shipbuilding, smelting, biomedicine and other fields due to their low density, high strength, good corrosion resistance and excellent biocompatibility. At present, titanium alloy ingots are generally produced by vacuum consumable arc melting technology, and the ingot crystallization is cooled by circulating water outside the crystallizer for heat exchange. As the melting ingot types increase, the existing cooling water simple temperature control or simple flow rate measures can no longer meet the requirements of rapid solidification, which is easy to cause metallurgical defects such as component segregation. Summary of the invention

[0003] The object of the present invention is to provide a device, a control system and a control method for improving the cooling effect of titanium alloy smelting. The present invention reduces or eliminates segregation and improves the uniformity of ingot composition.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A device for improving the cooling effect of titanium alloy smelting, comprising a smelting station, wherein a water-cooled crystallizer body is placed inside the smelting station, a smelting station circulating water mechanism is connected to the bottom of the smelting station, a smelting station water inlet mechanism is connected to the bottom of the smelting station circulating water mechanism, a smelting station water outlet mechanism is connected to the upper side of the smelting station, a cooling water tank is arranged between the smelting station water inlet mechanism and the smelting station water outlet mechanism, the smelting station circulating water mechanism is provided with a flow detection device and a pressure detection device, the smelting station circulating water mechanism, the smelting station water inlet mechanism and the smelting station water outlet mechanism are multi-controlled by a PLC controller in stages to adjust the water inlet flow control mode, the water outlet temperature control mode and the water outlet flow control mode, so as to improve the cooling effect of titanium alloy smelting.

[0006] Preferably, the smelting station circulating water mechanism comprises a first water inlet pipe of the smelting station and a circulating water pump of the smelting station, the first water inlet pipe of the smelting station is arranged at the bottom of the smelting station, the first water inlet pipe of the smelting station is connected to a smelting station water inlet flow detector and a second pressure detector in sequence from top to bottom, the water inlet of the smelting station circulating water pump is connected to the bottom of the first circulating water pipe of the smelting station, the top of the first circulating water pipe of the smelting station is connected to the bottom of the other side of the smelting station, the water outlet of the circulating water pump of the smelting station is connected to the second circulating water pipe of the smelting station, a pipeline check valve is installed on the second circulating water pipe of the smelting station, and a first pressure detector is installed on the second circulating water pipe of the smelting station between the circulating water pump of the smelting station and the pipeline check valve.

[0007] Preferably, the smelting station water inlet mechanism includes a smelting station water inlet electric regulating valve, which is arranged at the bottom of the first water inlet pipe, and the bottom of the smelting station water inlet electric regulating valve is connected to the second water inlet pipe of the smelting station, the second water inlet pipe of the smelting station is connected to the smelting station water make-up pump, and the smelting station water make-up pump is connected to the cooling water tank, and the smelting station water inlet plate heat exchanger and the smelting station water inlet temperature detector are sequentially arranged on the second water inlet pipe of the smelting station along the water flow direction.

[0008] Preferably, the smelting station water outlet mechanism includes a smelting station return water pipe, which is arranged on the upper side of the smelting station, and the smelting station return water pipe is connected to a smelting station outlet water temperature detector and a smelting station outlet water flow detector in sequence along the water flow direction.

[0009] A control system for improving the cooling effect of titanium alloy smelting, comprising a smelting station water inlet flow detector, a smelting station water inlet temperature detector, a second pressure detector, a first pressure detector, a smelting station water outlet flow detector, a smelting station water outlet temperature detector, a smelting station water inlet electric regulating valve, a smelting station circulating water pump, a PLC controller, and a human-machine interface, wherein:

[0010] The circulating water pump of the smelting station is used for frequency conversion control. The smelting station water inlet flow detector, smelting station water inlet temperature detector, second pressure detector, first pressure detector, smelting station water outlet flow detector, smelting station water outlet temperature detector, smelting station water inlet electric regulating valve and smelting station circulating water pump all use distributed I / O and industrial network. The control program is located in the PLC controller. Through the PLC controller, the water inlet flow control mode, water outlet temperature control mode and water outlet flow control mode can be adjusted in stages to improve the cooling effect of titanium alloy smelting.

[0011] A control method for improving the cooling effect of titanium alloy smelting is implemented according to a control system for improving the cooling effect of titanium alloy smelting, comprising the following steps:

[0012] S1, arc starting stage: the PLC controller adopts the water inlet flow control mode to dynamically adjust the actual opening value of the smelting station water inlet electric regulating valve and the actual speed value of the smelting station circulating water pump, so that the actual value of the smelting station water inlet flow is consistent with the set value of the smelting station water inlet flow;

[0013] S2, stable smelting stage: the PLC controller adopts the outlet water temperature control mode to dynamically adjust the actual opening value of the smelting station water inlet electric regulating valve to make the actual value of the smelting station outlet water temperature consistent with the smelting station outlet water temperature set value;

[0014] S3, final melting stage: The PLC controller adopts the water inlet flow control mode to dynamically adjust the actual opening value of the smelting station water inlet electric regulating valve and the actual speed value of the smelting station circulating water pump, so that the actual value of the smelting station water inlet flow is consistent with the set value of the smelting station water inlet flow;

[0015] S4, cooling stage: The PLC controller adopts the water outlet flow control mode to dynamically adjust the actual opening value of the smelting station water inlet electric regulating valve and the actual speed value of the smelting station circulating water pump, so that the actual value of the smelting station water outlet flow is consistent with the smelting station water outlet flow set value.

[0016] Preferably, the specific steps of S1 are:

[0017] S101, the human-machine interface executes the arc starting stage process program block, and the PLC controller executes the water inlet flow control mode;

[0018] S102, after the PLC controller obtains the set value of the water inlet flow rate of the smelting station in the human-machine interface process program block, it calculates the opening set value of the smelting station water inlet electric regulating valve and the speed set value of the smelting station circulating water pump through closed-loop calculation;

[0019] S103, according to the result of S102, dynamically adjust the actual opening value of the smelting station water inlet electric regulating valve and the actual speed value of the smelting station circulating water pump, so that the actual value of the smelting station water inlet flow rate is consistent with the smelting station water inlet flow rate set value.

[0020] Preferably, the specific steps in S2 are:

[0021] S201, the human-machine interface executes the stable smelting stage process program block, and the PLC controller switches from the outlet water flow control mode to the outlet water temperature control mode;

[0022] S202, after the PLC controller obtains the set value of the outlet water temperature of the smelting station in the human-machine interface process program block, it calculates the opening setting value of the smelting station inlet water electric regulating valve through closed-loop calculation;

[0023] S203, according to the result of S202, dynamically adjust the actual opening value of the smelting station water inlet electric regulating valve to make the actual value of the smelting station water outlet temperature consistent with the smelting station water outlet temperature set value.

[0024] Preferably, in S201, the outlet water temperature control mode is cascade control, which is temperature, flow rate, and valve opening in sequence.

[0025] Preferably, the specific steps in S4 are:

[0026] S401, the cooling stage human-machine interface executes the cooling stage process program block, and the PLC controller switches from the water inlet flow control mode to the water outlet flow control mode;

[0027] S402, after the PLC controller obtains the set value of the smelting station water outlet flow rate in the human-machine interface process program block, it calculates the opening setting value of the smelting station water inlet electric regulating valve through closed-loop calculation;

[0028] S403, according to the result of S402, dynamically adjust the actual opening value of the smelting station water inlet electric regulating valve to make the actual value of the smelting station water outlet flow consistent with the smelting station water outlet flow set value.

[0029] The present invention has the following beneficial effects:

[0030] By adding and modifying relevant detection devices during the preparation process of titanium alloy ingots, converting the circulating pump into frequency conversion control, and adding flow detection devices and pressure detection devices at the water inlet of the smelting station, assisted by appropriate process parameters, the titanium alloy preparation is transformed from the original fixed temperature control or water outlet flow control to a stage-by-stage adjustable water inlet flow control mode, water outlet temperature control mode, and water outlet flow control mode. At the same time, a cascade control mode is added to the temperature control to enhance the system's anti-disturbance ability and improve the cooling effect, thereby reducing or eliminating segregation and improving the uniformity of the ingot composition. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The present invention is a schematic diagram of the structure of a device for improving the cooling effect of titanium alloy smelting.

[0032] Figure 2 The present invention is a flow chart of a control method for improving the cooling effect of titanium alloy smelting.

[0033] Figure 3 The present invention is a schematic diagram of the water outlet temperature control method for improving the cooling effect of titanium alloy smelting.

[0034] Figure 4 The present invention is a schematic diagram of the water inlet flow control method for improving the cooling effect of titanium alloy smelting.

[0035] Figure 5 The system schematic diagram of a control method for improving the cooling effect of titanium alloy smelting according to the present invention.

[0036] Among them: 1. Water-cooled crystallizer flange; 2. Exhaust manual valve; 3. Water-cooled crystallizer water guide jacket; 4. Melting station water guide jacket; 5. Water guide jacket seal; 6. Filling air; 7. Melting station shell; 8. Melting station return water pipeline; 9. Melting station outlet water temperature detector; 10. Melting station outlet water flow detector; 11. Melting station first circulating water pipeline; 12. Melting station circulating water pump; 13. Melting station inlet water flow detector; 14. Melting station first inlet water pipeline; 15. Second pressure detector; 16. First pressure detector; 17. Pipeline one-way valve; 18. Melting station inlet water electric regulating valve; 19. Melting station second inlet water pipeline; 20. Melting station inlet water temperature detector; 21. Melting station inlet plate heat exchanger; 22. Melting station make-up water pump; 23. Cooling water tank; 24. Water-cooled crystallizer body; 25. Melting station second circulating water pipeline. DETAILED DESCRIPTION

[0037] In order to make the purpose and technical solution of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention.

[0038] like Figure 1 A device for improving the cooling effect of titanium alloy smelting includes a smelting station 7, a water-cooled crystallizer body 24, a smelting station circulating water mechanism, a smelting station water inlet mechanism, a smelting station water outlet mechanism, and a cooling water tank 23.

[0039] The water-cooled crystallizer body 24 is placed inside the smelting station 7. The bottom of the smelting station 7 is connected to the smelting station circulating water mechanism, the bottom of the smelting station circulating water mechanism is connected to the smelting station water inlet mechanism, the upper side of the smelting station 7 is connected to the smelting station water outlet mechanism, a cooling water tank 23 is arranged between the smelting station water inlet mechanism and the smelting station water outlet mechanism, the smelting station circulating water mechanism is provided with a flow detection device and a pressure detection device, the smelting station circulating water mechanism, the smelting station water inlet mechanism and the smelting station water outlet mechanism are controlled by the PLC controller in stages with adjustable water inlet flow control mode, water outlet temperature control mode, and water outlet flow control mode, so as to improve the smelting cooling effect of titanium alloy.

[0040] A smelting station water guide jacket 4 is placed inside the smelting station 7, and there is a gap between the smelting station water guide jacket 4 and the smelting station 7, and the height of the smelting station water guide jacket 4 is lower than the smelting station 7. The outside of the water-cooled crystallizer body 24 is a water-cooled crystallizer water guide jacket 3 made of stainless steel. The flange of the water-cooled crystallizer water guide jacket 3 is attached to the smelting station water guide jacket 4, and is sealed by the smelting station water guide jacket sealing ring 5 to prevent the water flow inside and outside the smelting station water guide jacket 4 from being conducted. The water-cooled crystallizer body 24 is attached to the smelting station 7 through the water-cooled crystallizer flange 1, and both sides are sealed by O-rings to prevent water leakage.

[0041] The sealing ring 5 of the smelting station water guide jacket is a cylindrical special high-elasticity water-resistant material, which can be adapted to water-cooled crystallizer water guide jackets 3 of different specifications. At the same time, it can ensure that the cooling water entering from the bottom of the smelting station 7 flows along the gap between the water-cooled crystallizer body 24 and the water-cooled crystallizer flange 1 and the water-cooled crystallizer water guide jacket 3, forming a high-speed water flow to take away the heat, and flows out along the gap between the outside of the smelting station water guide jacket 4 and the smelting station 7, avoiding the cold water from the bottom of the smelting station 7 directly from the outside of the water-cooled crystallizer water jacket 3 to the outside of the smelting station water guide jacket 4 due to poor sealing, thereby reducing the cooling effect.

[0042] The smelting station circulating water mechanism includes a first circulating water pipeline 11, a smelting station circulating water pump 12, a water inlet flow detector 13, a smelting station first water inlet pipeline 14, a second pressure detector 15, a first pressure detector 16, a pipeline one-way valve 17, and a second circulating water pipeline 25.

[0043] The bottom of the smelting station 7 is connected to a first water inlet pipe 14 of the smelting station, and the first water inlet pipe 14 of the smelting station is connected to a smelting station water inlet flow detector 13 and a second pressure detector 15 from top to bottom in sequence; the water inlet of the smelting station circulating water pump 12 is connected to the bottom of the first circulating water pipe 11 of the smelting station, the top of the first circulating water pipe 11 of the smelting station is connected to the bottom of the other side of the smelting station 7, the water outlet of the circulating water pump 12 of the smelting station is connected to the second circulating water pipe 25 of the smelting station, a pipeline check valve 17 is installed on the second circulating water pipe 25 of the smelting station, and a first pressure detector 16 is installed in the second circulating water pipe 25 of the smelting station between the circulating water pump 12 of the smelting station and the pipeline check valve 17.

[0044] The smelting station water inlet mechanism includes a smelting station water inlet electric regulating valve 18, a smelting station second water inlet pipeline 19, a smelting station water inlet temperature detector 20, a smelting station water inlet plate heat exchanger 21, and a smelting station water supply pump 22.

[0045] The bottom of the first water inlet pipeline 14 is connected to a smelting station water inlet electric regulating valve 18, the bottom of the smelting station water inlet electric regulating valve 18 is connected to a smelting station second water inlet pipeline 19, the smelting station second water inlet pipeline 19 is connected to a smelting station water make-up pump 22, the smelting station water make-up pump 22 is connected to a cooling water tank 23, and a smelting station water inlet plate heat exchanger 21 and a smelting station water inlet temperature detector 20 are sequentially arranged on the smelting station second water inlet pipeline 19 along the water flow direction.

[0046] The smelting station water outlet mechanism includes a smelting station return water pipeline 8, a smelting station water outlet temperature detector 9, and a smelting station water outlet flow detector 10.

[0047] A smelting station return water pipe 8 is connected to the upper side of the smelting station 7, and a smelting station outlet water temperature detector 9 and a smelting station outlet water flow detector 10 are sequentially connected to the smelting station return water pipe 8 along the water flow direction.

[0048] There is filling air 6 in the space between the smelting station water guide jacket 4 and the smelting station 7 and the water-cooled crystallizer flange 1 , and an exhaust manual valve 2 is provided at one end of the smelting station 7 facing the water-cooled crystallizer flange 1 .

[0049] The filling air 6 will affect the heat exchange effect and must be discharged through the exhaust manual valve 2. The sign of completion of the discharge is that the cooling water overflows from the exhaust manual valve 2.

[0050] The smelting station circulating water pump 12 is frequency-controlled, and cooperates with the smelting station inlet water temperature detector 20 and the smelting station outlet water temperature detector 9, the smelting station inlet water flow detector 13, the smelting station outlet water flow detector 10, the smelting station inlet water electric regulating valve 18, and the control program running in the PLC controller to accurately control the amount of water entering the smelting station 7, thereby improving the cooling effect of the ingot.

[0051] A control system for improving the cooling effect of titanium alloy smelting, comprising a smelting station water inlet flow detector 13, a smelting station water inlet temperature detector 20, a second pressure detector 15, a first pressure detector 16, a smelting station water outlet flow detector 10, a smelting station water outlet temperature detector 9, a smelting station water inlet electric regulating valve 18, a smelting station circulating water pump 12, a PLC controller, and a human-machine interface, wherein:

[0052] The smelting station water inlet electric regulating valve 18 and the smelting station circulating water pump 12 are both used for frequency conversion control, and the smelting station water inlet flow detector 13, the smelting station water inlet temperature detector 20, the second pressure detector 15, the first pressure detector 16, the smelting station water outlet flow detector 10, the smelting station water outlet temperature detector 9, the smelting station water inlet electric regulating valve 18, and the smelting station circulating water pump 12 all use distributed I / O and industrial networks, and form a redundant ring network, which can reduce wiring and improve system reliability. Its control program is located in the PLC controller, and its status display is installed on the human-machine interface of the industrial computer.

[0053] The smelting station water inlet flow detector 13 is used to detect the actual flow value of the smelting station water inlet flow.

[0054] The smelting station inlet water temperature detector 20 is used to detect the actual water temperature value of the smelting station inlet water temperature.

[0055] The second pressure detector 15 and the first pressure detector 16 are used to detect the actual pressure value of the smelting station pressure and calculate the outlet water pressure of the circulating water pump 12 of the smelting station.

[0056] The smelting station outlet water flow detector 10 is used to detect the actual flow value of the smelting station outlet water flow.

[0057] The smelting station outlet water temperature detector 9 is used to detect the actual water temperature value of the smelting station outlet water temperature.

[0058] The smelting station water inlet electric regulating valve 18 is used to dynamically adjust the actual opening value of the smelting station water inlet electric regulating valve.

[0059] The smelting station circulating water pump 12 is used to dynamically adjust the actual speed value of the smelting station circulating water pump.

[0060] The PLC controller includes water inlet flow control mode, water outlet temperature control mode and water outlet flow control mode.

[0061] The human-machine interface includes an arc starting stage process program block, a stable melting stage process program block, a melting end stage process program block, and a cooling stage process program block.

[0062] like Figure 2-Figure 5 As shown, a control method for improving the cooling effect of titanium alloy smelting includes the following steps:

[0063] Before executing S1, it is necessary to place the water-cooled crystallizer body 24 in the smelting station 7, open the smelting station water supply pump 22, the smelting station water inlet regulating valve 18, and confirm that the water level of the cooling water tank 23 and the smelting station water inlet plate heat exchanger 21 are normal. The water temperature detected by the smelting station water inlet temperature is normal. At this time, there is filled air 6 in the space between the smelting station water guide jacket 4 and the smelting station 7 and the water-cooled crystallizer flange 1. The filled air 6 will affect the heat exchange effect and must be discharged through the exhaust manual valve 2. The sign of the completion of the discharge is that the cooling water overflows from the exhaust manual valve 2.

[0064] S1, arc starting stage: the PLC controller adopts the water inlet flow control mode to dynamically adjust the actual opening value of the smelting station water inlet electric regulating valve 18 and the actual speed value of the smelting station circulating water pump 12, so that the actual value of the smelting station water inlet flow is consistent with the smelting station water inlet flow set value.

[0065] S101, the human-machine interface executes the arc starting stage process program block, and the PLC controller executes the water inlet flow control mode.

[0066] First, select the required process number through the process call interface of the human-machine interface, and check the selected process parameters. If they are different from the requirements, they can be adjusted. After confirmation, turn on the smelting station water inlet electric regulating valve 18 and the smelting station circulating water pump 12. At this time, the electrical signals of the first pressure detector 16, the second pressure detector 15, the smelting station water inlet temperature detector 20, the smelting station water outlet temperature detector 9, the smelting station water inlet flow detector 13, the smelting station water outlet flow detector 10, the smelting station water inlet electric regulating valve 18, etc. are converted into digital signals through the analog input channel of the distributed IO and sent to the PLC controller for processing and displayed on the human-machine interface. The overall control principle is as follows Figure 5 .

[0067] When all parameters are normal and there is no alarm, arc smelting is carried out, the human-machine interface starts to run the arc starting stage process program block, and the PLC controller executes the water inlet flow control mode.

[0068] S102, after the PLC controller obtains the set value of the smelting station water inlet flow rate of the human-machine interface process program block, it calculates the opening set value of the smelting station water inlet electric regulating valve 18 and the speed set value of the smelting station circulating water pump 12 through closed-loop calculation.

[0069] In the water inlet flow control mode, the water inlet flow of the smelting station is taken as the controlled quantity, and its data is obtained by the water inlet flow detector 13 of the smelting station. The water inlet flow control principle diagram is as follows: Figure 4 shown.

[0070] After the PLC controller obtains the set value of the smelting station water inlet flow rate of the human-machine interface process program block, it reads the actual flow value of the smelting station water inlet flow rate detector 13, compares the set value of the smelting station water inlet flow rate with the actual flow value of the smelting station water inlet flow rate detector 13, and the deviation is calculated by the water inlet flow controller to output results 1 and 2.

[0071] Result 1 is used as the set value of the outlet water flow of the smelting station 7. After being transmitted together with the actual value data collected by the outlet water flow detection 10 of the smelting station, it is processed by the outlet water flow PI controller, and the result is the opening setting value of the smelting station water inlet electric regulating valve 18.

[0072] The calculation result 2 of the water inlet flow controller is used as the set value of the circulating pump outlet flow. At this time, the difference between the smelting station water inlet flow 13 and the smelting station outlet flow detection 10 is used as the actual value of the circulating pump outlet flow. The first pressure detector 16 and the second pressure detector 15 calculate the outlet pressure of the smelting station circulating water pump 12. The actual value of the circulating pump outlet flow and the smelting station circulating water pump outlet pressure are jointly calculated to obtain the actual value of the circulating pump speed. The circulating pump outlet flow PI controller is used for calculation and processing, and the result is the speed setting value of the smelting station circulating water pump 12.

[0073] S103, according to the result of S102, dynamically adjust the actual opening value of the smelting station water inlet electric regulating valve 18 and the actual speed value of the smelting station circulating water pump 12, so that the actual value of the smelting station water inlet flow rate is consistent with the smelting station water inlet flow rate set value.

[0074] The set value of the smelting station water inlet electric regulating valve converts the analog output channel of the distributed I / O into a current signal through the Profinet bus to control the valve opening adjustment. The speed setting value of the smelting station circulating water pump 12 is directly given to the smelting station circulating water pump inverter through the Profinet bus to control the inverter speed. The overall control principle is as follows: Figure 5 .

[0075] The analog input channel of the distributed I / O reads the actual opening of the valve in real time, feeds it back to the PLC controller and then displays it on the human-machine interface.

[0076] The valve of the smelting station water inlet electric regulating valve 18 is dynamically adjusted to realize the opening control, so that the actual opening value of the smelting station water inlet electric regulating valve 18 is equal to the opening setting value of the smelting station water inlet electric regulating valve 18, thereby making the actual value of the smelting station water outlet flow consistent with the smelting station water outlet flow setting value.

[0077] Dynamically adjust the frequency converter of the smelting station circulating water pump 12 to achieve speed control, so that the actual speed value of the smelting station circulating water pump 12 is equal to the speed setting value of the smelting station circulating water pump 12, so that the actual value of the circulating pump outlet flow rate is consistent with the circulating pump outlet flow rate setting value.

[0078] Dynamically adjust the actual opening value of the smelting station water inlet electric regulating valve 18 and the actual speed value of the smelting station circulating water pump 12 to make the actual value of the smelting station water inlet flow consistent with the smelting station water inlet flow set value. During the adjustment process, in order to ensure the safety of the melting process, the temperature and the minimum flow are used as disturbances to affect the adjustment process.

[0079] S2, stable smelting stage: the PLC controller adopts the outlet water temperature control mode to dynamically adjust the actual opening value of the smelting station water inlet electric regulating valve 18, so that the actual value of the smelting station outlet water temperature is consistent with the smelting station outlet water temperature set value.

[0080] S201, the human-machine interface executes the stable smelting stage process program block, and the PLC controller switches from the outlet water flow control mode to the outlet water temperature control mode.

[0081] After entering the stable smelting period, due to the increase in heat, the human-machine interface executes the stable smelting stage process program block, and the PLC controller switches from the water inlet flow control mode to the water outlet temperature control mode.

[0082] The outlet water temperature control mode is cascade control, which is temperature, flow rate and valve opening in sequence.

[0083] S202, after the PLC controller obtains the set value of the outlet water temperature of the smelting station in the human-machine interface process program block, it calculates the opening setting value of the smelting station inlet water electric regulating valve 18 through closed-loop calculation.

[0084] In the outlet water temperature control mode, the outlet water temperature of the melting station is taken as the controlled variable, and its data is obtained by the outlet water temperature detector 9 of the melting station. The outlet water temperature control principle diagram is as follows: Figure 3 shown.

[0085] The corresponding program block in the PLC controller obtains the set value of the outlet water temperature of the smelting station from the human-machine interface process program block, reads the actual water temperature value of the outlet water temperature detector 9 of the smelting station, compares the set value of the outlet water temperature of the smelting station with the actual water temperature value of the outlet water temperature detector 9 of the smelting station, and the deviation is calculated by the temperature PI controller to obtain the set value of the outlet water flow rate of the smelting station.

[0086] The smelting station outlet water flow set value is compared with the actual flow value obtained by the smelting station outlet water flow detector 10, and the opening set value of the smelting station water inlet electric regulating valve 18 is calculated by the outlet water flow PI controller.

[0087] When the deviation between the smelting station water inlet flow set value on the human-machine interface and the actual value of the smelting station water inlet flow exceeds the smelting station water inlet flow deviation set value, an alarm record will be generated and stored.

[0088] S203, according to the result of S202, dynamically adjust the actual opening value of the smelting station water inlet electric regulating valve 18 to make the actual value of the smelting station water outlet temperature consistent with the smelting station water outlet temperature set value.

[0089] The potentiometer installed inside the smelting station water inlet electric regulating valve 18 can obtain the actual opening value, and after PI operation with the opening setting value of the smelting station water inlet electric regulating valve 18, the actual opening of the smelting station water inlet electric regulating valve 18 is controlled, thereby adjusting the water inlet flow rate, and then making the actual value of the melting station outlet water temperature consistent with the melting station outlet water temperature setting value. Through the adjustment of the three-stage cascade controller, external disturbances such as changes in the inlet water temperature and overshoot and fluctuations caused by changes in the cooled object can be effectively avoided.

[0090] At this time, to ensure the cooling capacity, the actual speed value of the smelting station circulating water pump 12 is the maximum set value. The data measured by the smelting station water flow detection 13, the second pressure detector 15, and the first pressure detector 16 are used as references and do not participate in the control.

[0091] S3, final melting stage: The PLC controller adopts the water inlet flow control mode to dynamically adjust the actual opening value of the smelting station water inlet electric regulating valve and the actual speed value of the smelting station circulating water pump, so that the actual value of the smelting station water inlet flow is consistent with the smelting station water inlet flow set value.

[0092] The human-machine interface at the final melting stage executes the final melting stage process program block, and the PLC controller switches from the outlet water temperature control mode to the inlet water flow control mode. The control block diagram is as follows: Figure 3 , the control mode is the same as S1 until the smelting is completed.

[0093] S4, cooling stage: The PLC controller adopts the water outlet flow control mode to dynamically adjust the actual opening value of the smelting station water inlet electric regulating valve and the actual speed value of the smelting station circulating water pump, so that the actual value of the smelting station water outlet flow is consistent with the set value of the smelting station water outlet flow.

[0094] When the weight of the consumable electrode reaches the limit value, the system automatically cuts off the power supply, smelting stops and enters the cooling stage.

[0095] S401, the cooling stage human-machine interface executes the cooling stage process program block, and the PLC controller switches from the water inlet flow control mode to the water outlet flow control mode.

[0096] S402, after the PLC controller obtains the set value of the smelting station water outlet flow rate in the human-machine interface process program block, it calculates the opening setting value of the smelting station water inlet electric regulating valve 18 through closed-loop calculation.

[0097] In order to save energy, the smelting station circulating water pump 12 is turned off, and only the smelting station outlet water flow control is retained. The outlet water flow control is achieved through the smelting station water inlet electric regulating valve 18. The outlet water flow setting has a minimum limit to ensure that the pipeline one-way valve 17 can be opened normally until the cooling is completed.

[0098] At this time, the smelting station outlet water flow rate and cooling time control are set according to the human-machine interface. In the human-machine interface, when the actual time reaches the set cooling time, the smelting station water inlet electric regulating valve 18 is closed to end the work.

[0099] After the PLC controller obtains the set value of the smelting station outlet water flow rate of the human-machine interface process program block, it is transmitted together with the actual value data collected by the smelting station outlet water flow rate detection 10 and then processed by the outlet water flow rate PI controller, and the result is the opening setting value of the smelting station water inlet electric regulating valve 18.

[0100] S403, according to the result of S402, dynamically adjust the actual opening value of the smelting station water inlet electric regulating valve 18 to make the actual value of the smelting station water outlet flow consistent with the smelting station water outlet flow set value.

[0101] The set value of the smelting station water inlet electric regulating valve converts the analog output channel of the distributed I / O into a current signal through the Profinet bus to control the valve opening adjustment.

[0102] The valve of the smelting station water inlet electric regulating valve 18 is dynamically adjusted to realize the opening control, so that the actual opening value of the smelting station water inlet electric regulating valve 18 is equal to the opening setting value of the smelting station water inlet electric regulating valve 18, thereby making the actual value of the smelting station water outlet flow consistent with the smelting station water outlet flow setting value.

Claims

1. A device for improving the cooling effect of titanium alloy smelting, characterized in that: The invention comprises a smelting station, wherein a water-cooled crystallizer body is placed inside the smelting station, a smelting station circulating water mechanism is connected to the bottom of the smelting station, a smelting station water inlet mechanism is connected to the bottom of the smelting station circulating water mechanism, a smelting station water outlet mechanism is connected to the upper side of the smelting station, a cooling water tank is arranged between the smelting station water inlet mechanism and the smelting station water outlet mechanism, the smelting station circulating water mechanism is provided with a flow detection device and a pressure detection device, the smelting station circulating water mechanism, the smelting station water inlet mechanism and the smelting station water outlet mechanism are controlled by a PLC controller in stages through a water inlet flow control mode, a water outlet temperature control mode and a water outlet flow control mode, so as to improve the smelting cooling effect of titanium alloy.

2. The device for improving the cooling effect of titanium alloy smelting according to claim 1 is characterized in that: The circulating water mechanism of the smelting station comprises a first water inlet pipe of the smelting station and a circulating water pump of the smelting station. The first water inlet pipe of the smelting station is arranged at the bottom of the smelting station. The first water inlet pipe of the smelting station is connected to a smelting station water inlet flow detector and a second pressure detector in sequence from top to bottom. The water inlet of the circulating water pump of the smelting station is connected to the bottom of the first circulating water pipe of the smelting station. The top of the first circulating water pipe of the smelting station is connected to the bottom of the other side of the smelting station. The water outlet of the circulating water pump of the smelting station is connected to the second circulating water pipe of the smelting station. A pipeline check valve is installed on the second circulating water pipe of the smelting station. A first pressure detector is installed on the second circulating water pipe of the smelting station between the circulating water pump of the smelting station and the pipeline check valve.

3. The device for improving the cooling effect of titanium alloy smelting according to claim 2 is characterized in that: The smelting station water inlet mechanism includes a smelting station water inlet electric regulating valve, which is arranged at the bottom of the first water inlet pipeline, and the bottom of the smelting station water inlet electric regulating valve is connected to the smelting station second water inlet pipeline, the smelting station second water inlet pipeline is connected to the smelting station water make-up pump, and the smelting station water make-up pump is connected to the cooling water tank, and the smelting station water inlet plate heat exchanger and the smelting station water inlet temperature detector are sequentially arranged on the second water inlet pipeline of the smelting station along the water flow direction.

4. The device for improving the cooling effect of titanium alloy smelting according to claim 1 is characterized in that: The smelting station water outlet mechanism includes a smelting station return water pipeline, which is arranged on the upper side of the smelting station. The smelting station return water pipeline is sequentially connected with a smelting station water outlet temperature detector and a smelting station water outlet flow detector along the water flow direction.

5. A control system for improving the cooling effect of titanium alloy smelting, characterized in that: It includes a smelting station water inlet flow detector, a smelting station water inlet temperature detector, a second pressure detector, a first pressure detector, a smelting station water outlet flow detector, a smelting station water outlet temperature detector, a smelting station water inlet electric regulating valve, a smelting station circulating water pump, a PLC controller, and a human-machine interface, wherein: The circulating water pump of the smelting station is used for frequency conversion control. The smelting station water inlet flow detector, smelting station water inlet temperature detector, second pressure detector, first pressure detector, smelting station water outlet flow detector, smelting station water outlet temperature detector, smelting station water inlet electric regulating valve and smelting station circulating water pump all use distributed I / O and industrial network. The control program is located in the PLC controller. Through the PLC controller, the water inlet flow control mode, water outlet temperature control mode and water outlet flow control mode can be adjusted in stages to improve the cooling effect of titanium alloy smelting.

6. A control method for improving the cooling effect of titanium alloy smelting, characterized in that: The control system for improving the cooling effect of titanium alloy smelting according to claim 5 comprises the following steps: S1, arc starting stage: the PLC controller adopts the water inlet flow control mode to dynamically adjust the actual opening value of the smelting station water inlet electric regulating valve and the actual speed value of the smelting station circulating water pump, so that the actual value of the smelting station water inlet flow is consistent with the set value of the smelting station water inlet flow; S2, stable smelting stage: the PLC controller adopts the outlet water temperature control mode to dynamically adjust the actual opening value of the smelting station water inlet electric regulating valve to make the actual value of the smelting station outlet water temperature consistent with the smelting station outlet water temperature set value; S3, final melting stage: The PLC controller adopts the water inlet flow control mode to dynamically adjust the actual opening value of the smelting station water inlet electric regulating valve and the actual speed value of the smelting station circulating water pump, so that the actual value of the smelting station water inlet flow is consistent with the set value of the smelting station water inlet flow; S4, cooling stage: The PLC controller adopts the water outlet flow control mode to dynamically adjust the actual opening value of the smelting station water inlet electric regulating valve and the actual speed value of the smelting station circulating water pump, so that the actual value of the smelting station water outlet flow is consistent with the smelting station water outlet flow set value.

7. The control method for improving the cooling effect of titanium alloy smelting according to claim 6 is characterized in that: The specific steps of S1 are: S101, the human-machine interface executes the arc starting stage process program block, and the PLC controller executes the water inlet flow control mode; S102, after the PLC controller obtains the set value of the water inlet flow rate of the smelting station in the human-machine interface process program block, it calculates the opening set value of the smelting station water inlet electric regulating valve and the speed set value of the smelting station circulating water pump through closed-loop calculation; S103, according to the result of S102, dynamically adjust the actual opening value of the smelting station water inlet electric regulating valve and the actual speed value of the smelting station circulating water pump, so that the actual value of the smelting station water inlet flow rate is consistent with the smelting station water inlet flow rate set value.

8. The control method for improving the cooling effect of titanium alloy smelting according to claim 6, characterized in that: The specific steps in S2 are: S201, the human-machine interface executes the stable smelting stage process program block, and the PLC controller switches from the outlet water flow control mode to the outlet water temperature control mode; S202, after the PLC controller obtains the set value of the outlet water temperature of the smelting station in the human-machine interface process program block, it calculates the opening setting value of the smelting station inlet water electric regulating valve through closed-loop calculation; S203, according to the result of S202, dynamically adjust the actual opening value of the smelting station water inlet electric regulating valve to make the actual value of the smelting station water outlet temperature consistent with the smelting station water outlet temperature set value.

9. The control method for improving the cooling effect of titanium alloy smelting according to claim 8, characterized in that: In S201, the outlet water temperature control mode is cascade control, which is temperature, flow rate, and valve opening in sequence.

10. The control method for improving the cooling effect of titanium alloy smelting according to claim 1, characterized in that: The specific steps in S4 are: S401, the cooling stage human-machine interface executes the cooling stage process program block, and the PLC controller switches from the water inlet flow control mode to the water outlet flow control mode; S402, after the PLC controller obtains the set value of the smelting station water outlet flow rate in the human-machine interface process program block, it calculates the opening setting value of the smelting station water inlet electric regulating valve through closed-loop calculation; S403, according to the result of S402, dynamically adjust the actual opening value of the smelting station water inlet electric regulating valve to make the actual value of the smelting station water outlet flow consistent with the smelting station water outlet flow set value.

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