Semi-continuous constant-temperature casting control device for copper and copper alloy

Abstract

The utility model discloses a copper and copper alloy semi-continuous constant temperature casting control device, which belongs to the technical field of copper ingot casting processing, and comprises a cubic water tank, a plate exchanger, a crystallizer and a bypass, the crystallizer is communicated with the cubic water tank through a water return pipe, the crystallizer is communicated with the plate exchanger through a water inlet pipe, and the bypass is communicated with the plate exchanger through a water outlet pipe. A variable frequency pump is installed on a pipeline between the cubic water tank and the plate exchanger, a heating type thermocouple is fixedly installed in an inner cavity of the cubic water tank, and a bypass is communicated between the water return pipe and the water inlet pipe. Through cooperation of the cubic water tank, the variable frequency pump, the plate type exchanger, the electric valve, the bypass and the heating type thermocouple, constant-temperature casting control over the water temperature of the inlet of the crystallizer is achieved, stable casting of copper and copper alloy ingots is guaranteed, and a foundation is laid for subsequent obtaining of copper and copper alloy strip finished products with stable structures and performance.

Description

Technical Field

[0001] The utility model relates to the technical field of copper ingot processing, and specifically relates to a semi - continuous constant - temperature casting control device for copper and copper alloys. Background Technique

[0002] When copper and copper alloys are semi - continuously cast, in order to cool the copper liquid into copper ingots in time, cooling the ingots with circulating water is an essential link in the casting process of copper and copper alloys. Constant - temperature circulating water is the key factor for controlling the internal structure, external quality and casting cracking of copper ingots. The current cooling towers for cooling ingots mainly have the following defects: The hot water after casting copper and copper alloys flows into the hot water pool through the casting well, and then is pumped into the cooling tower by a centrifugal pump for cooling and then flows into the cold water pool. When casting copper and copper alloys, it is transported into the mold through a centrifugal pump for casting. Due to seasonal changes and poor temperature control, there are often problems such as large temperature differences and frequent changes in casting processes during the casting of copper and copper alloys, resulting in fluctuations in the quality of casting products and a reduction in the product yield. Based on this, in order to achieve constant - temperature casting and maintain the stability of the copper and copper alloy casting process, the utility model has developed a semi - continuous constant - temperature casting control device for copper and copper alloys, so as to achieve the stable casting of semi - continuous ingots of copper and copper alloys. Content of the Utility Model

[0003] The purpose of the utility model is to provide a semi - continuous constant - temperature casting control device for copper and copper alloys, so as to solve the problems of large temperature differences in the casting water temperature and frequent changes in casting processes during the casting of copper and copper alloys in the prior art, resulting in low casting quality, and thus obtain high - quality copper and copper alloy ingots through constant - temperature casting control.

[0004] To achieve the above purpose, the utility model provides a semi - continuous constant - temperature casting control device for copper and copper alloys, including a cubic water tank, a variable - frequency pump is installed on the pipeline between the cubic water tank and the plate heat exchanger, and a heating thermocouple is fixedly installed in the inner cavity of the cubic water tank; a mold, the mold is communicated with the cubic water tank through a return pipe; a plate heat exchanger, the plate heat exchanger is communicated with the mold through a water inlet pipe; and a bypass, the bypass is communicated between the water inlet pipe and the return pipe.

[0005] Preferably, an electric valve is installed at the pipeline outlet of the plate heat exchanger.

[0006] Preferably, the flow rate of the variable - frequency pump is: 70 - 80m 3 / h, and the pressure is 0.05 - 0.06 MPa.

[0007] Preferably, the size of the plate heat exchanger is 161m 2 .

[0008] Preferably, the bypass pipe diameter is DN100.

[0009] Preferably, the power of the heating thermocouple is 25 - 30 kW.

[0010] Preferably, the constant temperature of the water entering the crystallizer is 25 - 28 °C;

[0011] Preferably, a thermometer is fixedly installed in the inner cavity of the cubic water tank.

[0012] Preferably, it further includes a water replenishing pipe provided between the cubic water tank and the plate heat exchanger. The water replenishing pipe is connected to the plate heat exchanger through a maintenance pipe, and the water replenishing pipe is connected to the cubic water tank through a standby pipe.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] Through the coordinated cooperation of the cubic water tank, variable frequency pump, plate heat exchanger, electric valve, bypass and heating thermocouple, the present utility model realizes the constant temperature casting control of the water temperature at the inlet of the crystallizer, ensures the stable casting of copper and copper alloy ingots, and lays a foundation for obtaining copper and copper alloy strip products with stable structure and performance subsequently. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a structural schematic diagram of the present utility model;

[0016] Figure 2 is a structural schematic diagram of the connection between the water replenishing pipe of the present utility model and the cubic water tank and the plate heat exchanger;

[0017] Figure 3 is a structural schematic diagram of the connection between the cubic water tank and the plate heat exchanger of the present utility model.

[0018] In the figure: 1. Cubic water tank; 2. Variable frequency pump; 3. Plate heat exchanger; 4. Electric valve; 5. Bypass; 6. Heating thermocouple; 7. Crystallizer; 8. Water inlet pipe; 9. Return pipe; 10. Maintenance pipe; 11. Standby pipe; 12. Water replenishing pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0020] Please refer to Figures 1 - 3, the present utility model provides a semi - continuous constant - temperature casting control device for copper and copper alloys, which includes a cubic water tank 1, a plate heat exchanger 3, a crystallizer 7 and a bypass 5. The crystallizer 7 is connected to the cubic water tank 1 through a return water pipe 9, and the crystallizer 7 is connected to the plate heat exchanger 3 through a water inlet pipe 8. A variable - frequency pump 2 is installed on the pipeline between the cubic water tank 1 and the plate heat exchanger 3. A heating - type thermocouple 6 is fixedly installed in the inner cavity of the cubic water tank 1. A bypass 5 is connected between the return water pipe 9 and the water inlet pipe 8. An electric valve 4 is installed at the pipeline outlet of the plate heat exchanger 3.

[0021] It should be noted that when the circulating cooling signal is received between the plate heat exchanger 3 and the cubic water tank 1, the bypass opens, the bypass 5 receives a closing signal, the rotational speed of the variable - frequency pump 2 decreases. An electric valve 4 is installed at the outlet of the plate heat exchanger 3. The water temperature at the inlet of the crystallizer 7 is adjusted through the electric valve. When the temperature of the cubic water tank 1 is lower than the set inlet temperature of the crystallizer 7, the heating - type thermocouple 6 heats. When the temperature of the cubic water tank 1 is higher than the set inlet temperature of the crystallizer 7, the plate heat exchanger 3 cools down.

[0022] In this embodiment, the constant - temperature needs to be maintained between 25°C and 28°C. During use, the return water pipe 9 of the crystallizer 7 is connected to the 1m 3 cubic water tank 1. When the return water temperature is higher than the inlet water temperature of the crystallizer 7 by 28°C, the return water in the cubic water tank 1 is sent into the plate heat exchanger 3 through the variable - frequency pump 2. At this time, the water temperature is higher than the inlet water temperature of the crystallizer 7, and the circulating cooling water of the bypass 5 opens for cooling circulation. The water temperature at the inlet of the crystallizer 7 is adjusted through the plate heat exchanger 3 and the electric valve 4 to make the water temperature at the inlet of the crystallizer 7 reach between 25°C and 28°C, and then the constant - temperature casting of copper and copper alloys starts.

[0023] Among them, a thermometer is fixedly installed in the inner cavity of the cubic water tank 1. When the temperature of the cubic water tank 1 is lower than the set inlet temperature of the crystallizer 7, the heating - type thermocouple 6 heats. When the temperature of the cubic water tank 1 is higher than the set inlet temperature of the crystallizer 7, the plate cooler 3 cools down.

[0024] It should be noted that in this embodiment, the semi - continuous constant - temperature casting control device for copper and copper alloys further includes a water replenishing pipeline 12 provided between the cubic water tank 1 and the plate heat exchanger 3. The water replenishing pipeline 12 is connected to the plate heat exchanger 3 through a maintenance pipeline 10, and the water replenishing pipeline 12 is connected to the cubic water tank 1 through a standby pipeline 11. Through the setting of the water replenishing pipeline 12, it can be used to replenish water into the cubic water tank 1 or the plate heat exchanger 3.

[0025] Specifically, when the casting water temperature at the inlet of the mold 7 is too high, the plate heat exchanger 3 is turned on for cooling, and the circulating cooling of the bypass 5 is increased when there is no casting, and the set casting water temperature is obtained through the electric valve 4; when the casting water temperature at the inlet of the mold 7 is too low, the heating thermocouple 6 in the cubic water tank 1 works to increase the temperature in the cubic water tank 1, the circulating cooling of the bypass 5 is increased when there is no casting, the plate cooler works, and the set casting water temperature is obtained through the electric valve 4, so as to achieve the constancy of the casting water temperature in any environment.

[0026] In addition, in this embodiment, the flow rate of the variable-frequency pump 2 is 70 - 80 m 3 / h, and the pressure is 0.05 - 0.06 MPa. The specific model of this variable-frequency pump 2 is BYQDL8 - 80, which can meet the requirements of a flow rate of 80 m 3 / h and a pressure of 0.06 MPa, and has good performance and energy-saving effects. The specific working principle of this variable-frequency pump 2 is mainly based on the frequency converter adjusting the motor speed, thereby changing the flow rate and pressure of the water pump. When an external control signal is input into the frequency converter, the frequency converter will adjust the frequency and voltage of the output power supply according to the set parameters. By changing the supply frequency of the asynchronous motor, the speed of the motor rotor can be smoothly changed. The frequency converter first converts alternating current into direct current, then converts the direct current into the required frequency and voltage, and then supplies it to the motor. The frequency converter controls the frequency and voltage between the power supply and the motor by sensing the rotor position and current magnitude of the induction motor and adjusts them. The current output by the frequency converter passes through the motor winding to generate a rotating magnetic field. Under the action of the rotating magnetic field, the motor rotor starts to rotate and transmits the power to the pump impeller connected to the motor shaft. The rotation of the pump impeller sucks and discharges the liquid, realizing the work of the pump.

[0027] Furthermore, the size of the plate heat exchanger 3 is 161 m 2 . The specific model of this plate heat exchanger 3 is the A3 series of Alfa Laval. The working principle of this plate heat exchanger 3 is that through the corrugations and concave-convex ridges on the plate, strong turbulence is generated when the cold and hot fluids pass through, so as to efficiently conduct heat exchange. Its wide applications include refrigeration, heating, ventilation and air conditioning, oil cooling and other fields, and it is especially suitable for situations that require high heat exchange efficiency and compact space. The design features of this plate heat exchanger 3 lie in its structure and material. Usually, stainless steel (such as grades 304 and 316) or titanium alloy materials are used. These materials not only have good corrosion resistance, but also can withstand high temperature and high pressure environments. Due to its compact structure and small floor area, in the case of the same heat exchange capacity, its floor area is only a small part of that of the traditional shell-and-tube heat exchanger. In addition, the seal gasket design of this plate heat exchanger 3 ensures the tightness of the fluid channel, effectively preventing cross-contamination. And this design is also convenient for disassembly and cleaning, and is relatively easy to maintain.

[0028] Preferably, the diameter of the bypass 5 is DN100. A bypass 5 valve is installed on the bypass 5 pipeline, and the specific model of this valve is H74H-16C. Most of the design materials of this type of valve are heat-resistant alloy steel or stainless steel to ensure good performance under high-temperature working conditions. The H74H-16C type valve has the characteristics of simple structure, flexible operation and reliable sealing performance, and is widely used in industrial fields such as petroleum, chemical industry and metallurgy.

[0029] It is worth noting that the power of the heating thermocouple 6 is 25 - 30kW. The specific model of this heating thermocouple 6 is kW-602. This type of thermocouple has the characteristic of fast response, and the measurement time only takes 4 - 6 seconds. It is suitable for high-temperature environments of 1500 - 1700°C, and the upper limit temperature can reach 1800°C. Its structure is mainly composed of a temperature-measuring thermocouple head and a large paper tube. The thermocouple head includes positive and negative thermocouple wires welded to the compensating wire, and is protected by quartz support and slag-proof cap.

[0030] Through the coordinated cooperation of the cubic water tank 1, the variable-frequency pump 2, the plate heat exchanger 3, the electric valve 4, the bypass 5 and the heating thermocouple 6, the present utility model realizes the constant-temperature casting control of the water temperature at the inlet of the mold, ensures the stable casting of copper and copper alloy ingots, and lays a foundation for obtaining copper and copper alloy strip products with stable structure and performance subsequently.

[0031] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A semi-continuous constant temperature casting control device for copper and copper alloys, characterized in that: include: A cubic water tank (1), wherein a variable frequency pump (2) is installed on the pipeline between the cubic water tank (1) and the plate exchanger (3), and a heating thermocouple (6) is fixedly installed in the inner cavity of the cubic water tank (1); A crystallizer (7), wherein the crystallizer (7) is connected to the cubic water tank (1) via a return pipe (9); a plate exchanger (3), the plate exchanger (3) being connected to the crystallizer (7) via a water inlet pipe (8); and A bypass (5), wherein the bypass (5) is connected between the water inlet pipe (8) and the water return pipe (9).

2. A semi-continuous constant temperature casting control device for copper and copper alloys according to claim 1, characterized in that: An electric valve (4) is installed at the pipeline outlet of the plate exchanger (3).

3. A semi-continuous constant temperature casting control device for copper and copper alloys according to claim 1, characterized in that: The flow rate of the variable frequency pump (2) is 70-80m 3 / h, the pressure is 0.05-0.06MPa.

4. A semi-continuous constant temperature casting control device for copper and copper alloys according to claim 1, characterized in that: The size of the plate exchanger (3) is 161m 2 .

5. A semi-continuous constant temperature casting control device for copper and copper alloys according to claim 1, characterized in that: The bypass pipe (5) has a diameter of DN100.

6. A semi-continuous constant temperature casting control device for copper and copper alloys according to claim 1, characterized in that: The power of the heating thermocouple (6) is 25-30 kW.

7. A semi-continuous constant temperature casting control device for copper and copper alloys according to claim 1, characterized in that: The constant temperature of water entering the crystallizer (7) is 25-28°C.

8. A semi-continuous constant temperature casting control device for copper and copper alloys according to claim 1, characterized in that: A thermometer is fixedly installed in the inner cavity of the cubic water tank (1).

9. A semi-continuous constant temperature casting control device for copper and copper alloys according to claim 1, characterized in that: It also includes a water supply pipe (12) arranged between the cubic water tank (1) and the plate exchanger (3), wherein the water supply pipe (12) is connected to the plate exchanger (3) via a maintenance pipe (10), and the water supply pipe (12) is connected to the cubic water tank (1) via a spare pipe (11).

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