Automatic constant temperature device of horizontal continuous casting holding furnace

Abstract

The utility model relates to the technical field of horizontal continuous casting holding furnaces, and discloses an automatic constant temperature device of a horizontal continuous casting holding furnace, which comprises a base, the upper surface of the base is fixedly connected with a holding furnace, and the right side of the upper surface of the base is fixedly connected with a control box. According to the automatic constant temperature device of the horizontal continuous casting holding furnace, the real-time temperature and the set temperature of the temperature control meter are read through the PLC, the real-time voltage of the voltmeter is read, the real-time environment temperature, the furnace shell temperature and other data are collected, and the temperature of the furnace shell is controlled according to the reference voltage parameter set by the touch display screen, the upper and lower limit parameters of temperature difference compensation and the upper and lower limit parameters of the environment temperature. Target voltage is obtained through calculation of furnace shell temperature upper and lower limit parameters and holding furnace molten copper liquid level parameters, the PLC compares the real-time voltage with the target voltage, the frequency converter drives the voltage regulating motor to rotate forwards and backwards to adjust rising and falling of output voltage of the induction transformer, the heating power of the holding furnace is adjusted, and the purpose of keeping the temperature of the holding furnace constant is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to horizontal continuous casting heat preservation furnace technical field, concretely is a kind of horizontal continuous casting heat preservation furnace automatic thermostat. BACKGROUND

[0002] H65 cold-rolled copper billet casted in the smelting area of copper material workshop of Guangzhou Copper Material Factory Co. Long-term quality problems such as perforation, edge crack, large tolerance, uneven and irregular casting lines affect the yield rate, especially in 2019, there are a large number of perforation problems, the yield rate is always low, the production cost is high, and frequent returns occur, the company solves these problems through efforts, and the thermostat control system is one of them.

[0003] Since the horizontal continuous casting heat preservation furnace is originally controlled by the on-off mode of the temperature control meter to control the contactor to realize the constant temperature of the copper water in the heat preservation furnace, there is a thermocouple sleeve between the temperature measuring point and the copper water, which causes a long response lag time, and the deviation between the real-time temperature and the actual temperature of the copper water is 50-150 DEG C. Due to the lag and deviation of the measured real-time temperature, the actual temperature of the copper water often fluctuates more than ±20 DEG C, and it is difficult to meet the casting temperature fluctuation requirement of ±10 DEG C within the casting process. According to the manual temperature control method of manual pressure regulation, an automatic pressure regulation mode is designed to realize the automatic pressure regulation and constant temperature control system of the copper water temperature in the heat preservation furnace. CONTENT OF THE UTILITY MODEL

[0004] (I) Technical problem solved

[0005] In view of the deficiencies of the prior art, the utility model provides a kind of horizontal continuous casting heat preservation furnace automatic thermostat, solve the problems raised in the above background art.

[0006] (II) Technical scheme

[0007] To achieve the above object, the utility model provides the following technical scheme: a kind of horizontal continuous casting heat preservation furnace automatic thermostat, including base, the upper surface of the base is fixedly connected with heat preservation furnace, the right side of the upper surface of the base is fixedly connected with control box, the right side surface of the control box is provided with rotatable door panel, the right side of the front of the door panel is provided with lock body, the front of the door panel is provided with touch display screen, temperature control meter and voltmeter, the inner wall of the control box is fixedly connected with mounting bracket, the front of the mounting bracket is fixedly connected with PLC and frequency converter, the inner wall of the bottom of the control box is fixedly connected with pressure regulating motor and inductive transformer.

[0008] Preferably, the upper surface of the control box is provided with an up-and-down through hole.

[0009] Preferably, the top of the outer side surface of the control box is provided with a left-and-right through heat dissipation groove, and the number of heat dissipation grooves is set to several groups.

[0010] Preferably, the bottom of the outer side of the holding furnace is fixed with a reinforcing member, and the lower surface of the reinforcing member is fixed with the upper surface of the base.

[0011] Preferably, the lower surface of the base is fixed with a buffer pad, and the material of the buffer pad is rubber.

[0012] Preferably, the material of the control box, the door plate, the mounting frame and the reinforcing member is stainless steel.

[0013] (Three) beneficial effects

[0014] Compared with the prior art, the utility model provides a horizontal continuous casting holding furnace automatic constant temperature device, has the following beneficial effects:

[0015] 1、 the horizontal continuous casting holding furnace automatic constant temperature device, through PLC reads temperature control table real time temperature and set temperature, reads voltmeter real time voltage, gathers real time environmental temperature, furnace shell temperature etc. Data, according to the reference voltage parameter set by touch display screen, the upper and lower limit parameters of temperature difference compensation, the upper and lower limit parameters of environmental temperature, the upper and lower limit parameters of furnace shell temperature and holding furnace copper water liquid level parameter calculation obtains target voltage, and PLC compares real time voltage and target voltage size, and after frequency converter drive voltage regulating motor positive and negative rotation adjustment inductive transformer output voltage rise, drop mode to realize the heating power of holding furnace adjustment, realizes holding furnace constant temperature purpose. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the whole structure schematic diagram of the utility model;

[0017] Figure 2 It is the local structure schematic diagram of the utility model;

[0018] Figure 3 It is the control box internal structure schematic diagram of the utility model;

[0019] Figure 4 It is the temperature difference compensation schematic diagram of the utility model;

[0020] Figure 5 It is the environmental temperature compensation schematic diagram of the utility model;

[0021] Figure 6 It is the furnace shell temperature compensation schematic diagram of the utility model;

[0022] Figure 7 It is the copper water liquid level compensation schematic diagram of the utility model.

[0023] In the figure: 1, base; 2, heat preservation furnace; 3, control box; 4, door plate; 5, lock body; 6, touch display screen; 7, temperature control meter; 8, voltage meter; 9, mounting bracket; 10, PLC; 11, frequency converter; 12, voltage regulating motor; 13, induction transformer; 14, wiring hole; 15, heat dissipation groove; 16, reinforcing part; 17, buffer pad. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0025] Please refer to Figures 1-7 The utility model provides a kind of technical scheme: a kind of horizontal continuous casting heat preservation furnace automatic constant temperature device, including base 1, the upper surface of base 1 is fixedly connected with heat preservation furnace 2, heat preservation furnace 2 is existing equipment, therefore, not too much description is made here, induction coil is originally provided in the inside of heat preservation furnace 2, voltage meter 8 is electrically connected with the induction coil originally provided in the inside of heat preservation furnace 2 by power line, the right side of the upper surface of base 1 is fixedly connected with control box 3, the right side surface of control box 3 is provided with rotatable door plate 4, the right side of the front of door plate 4 is provided with lock body 5, lock body 5 is existing product, therefore, not too much description is made here, the front of door plate 4 is provided with touch display screen 6, temperature control meter 7 and voltage meter 8, the inner wall of control box 3 is fixedly connected with mounting bracket 9, the front of mounting bracket 9 is fixedly connected with PLC 10 and frequency converter 11, the inner wall of the bottom of control box 3 is fixedly connected with voltage regulating motor 12 and induction transformer 13.

[0026] read temperature and set temperature of temperature control meter 7 by PLC 10, read real-time voltage of voltage meter 8, collect real-time environmental temperature, furnace shell temperature and other data, calculate target voltage according to reference voltage parameter set by touch display screen 6, upper and lower limit parameters of temperature difference compensation, upper and lower limit parameters of environmental temperature, upper and lower limit parameters of furnace shell temperature and copper water liquid level parameter of heat preservation furnace 2, compare real-time voltage and target voltage by PLC 10, drive voltage regulating motor 12 forward and reverse rotation by frequency converter 11 to adjust the output voltage of induction transformer 13 (i.e. the voltage of heat preservation furnace 2 induction coil) to increase and decrease, so as to realize the adjustment of heating power of heat preservation furnace 2, and realize the constant temperature purpose of heat preservation furnace 2.

[0027] According to power calculation formula: P=UIcos φ=U 2 / Zcos φ, since power frequency is constant at 50Hz, so impedance Z=R+XL+XC is constant;

[0028] The only control variable for adjusting the power of the holding furnace 2 is the output voltage U of the induction transformer 13, but in the constant temperature system, in order to realize the automatic voltage regulating constant temperature control, the target voltage is divided into five variables, i.e. the reference voltage U1, the temperature difference compensation voltage U2, the ambient temperature compensation voltage U3, the furnace shell temperature compensation voltage U4 and the liquid level compensation voltage U5, that is, U=U1+U2+U3+U4+U5.

[0029] U is the target voltage, i.e. the output voltage of the induction transformer 13;

[0030] U1 is the reference voltage, i.e. when the ambient temperature is 20 DEG C, the temperature setting of the temperature controller 7 is the same as the measured real-time copper water temperature, the furnace shell temperature is 200 DEG C, and the holding furnace 2 is filled with copper water for more than 3 hours, the voltage that can make the copper water temperature of the holding furnace 2 constant, and the voltage is adjusted according to the casting temperature of the copper blank and the temperature control effect.

[0031] U2 is the temperature difference compensation voltage, i.e. the voltage calculated according to the difference between the target temperature setting of the temperature controller 7 and the measured real-time copper water temperature, and when the copper water temperature is lower than the set temperature, U2 is positive, and vice versa, as shown in the formula (2). Figure 4

[0032] U3 is the ambient temperature compensation voltage, i.e. when the ambient temperature is 20 DEG C, U3 is not compensated, and when the ambient temperature is lower than 20 DEG C, U3 is positive, and vice versa, which is used for compensating the power dissipation caused by the change of the external ambient temperature, as shown in the formula (3). Figure 5

[0033] U4 is the furnace shell temperature compensation voltage, i.e. when the holding furnace 2 shell temperature is 200 DEG C, U4 is not compensated, and when the furnace shell temperature is higher than 200 DEG C, U4 is positive, and vice versa, which is used for compensating the power dissipation caused by the furnace shell, as shown in the formula (4). Figure 6

[0034] U5 is the copper water liquid level compensation voltage, i.e. when the holding furnace 2 is just filled with copper water, U5 is positive when the copper water liquid level is high, and U5 is 0 after 3 hours, which is used for compensating the power dissipation caused by the convection of copper water and air when the copper water liquid level is high or low, as shown in the formula (5). Figure 7

[0035] The size and shape of all components in the structure are not specifically limited here, and need to be produced according to the actual situation.

[0036] The utility model discloses in order to facilitate staff to connect the power cord in control box 3 with the power cord of holding furnace 2 electrically, therefore sets up the wire hole 14 that passes through up and down on the upper surface of control box 3, makes staff can pass through the inside of wire hole 14 with the power cord in control box 3, subsequently connects the power cord of holding furnace 2 electrically, has facilitated staff to connect the power cord in control box 3 with the power cord of holding furnace 2 electrically.​​​​

[0037] The utility model discloses to prevent the phenomenon of the electrical component in the control box 3 from being burnt out caused by the temperature in the control box 3 being higher and higher, therefore the left and right through heat dissipation groove 15 is set up at the top of the outer side of control box 3, the quantity of heat dissipation groove 15 is set to several groups, because the setting of heat dissipation groove 15, the heat generated by the electrical component in the control box 3 when working will be discharged from the inside of control box 3 through heat dissipation groove 15, realizes the function of heat dissipation, prevents the phenomenon of the electrical component in the control box 3 from being burnt out caused by the temperature in the control box 3 being higher and higher.

[0038] The utility model discloses to improve the stability of the connection between the heat preservation furnace 2 and base 1, therefore the reinforcing piece 16 is fixedly connected at the bottom of the outer side of heat preservation furnace 2, the lower surface of reinforcing piece 16 is fixedly connected with the upper surface of base 1, and reinforcing piece 16 increases the connecting area between heat preservation furnace 2 and base 1, improves the stability of the connection between heat preservation furnace 2 and base 1.

[0039] The utility model discloses to realize the function of buffering base 1, therefore the buffer pad 17 is fixedly connected at the lower surface of base 1, and the manufacturing material of buffer pad 17 is set to rubber, and the buffer pad 17 made of rubber material has good buffering effect, can prevent the vibration generated by heat preservation furnace 2 when working, causes the hard collision between base 1 and ground, realizes the function of buffering base 1.

[0040] The utility model discloses to prolong the service life of control box 3, door plate 4, mounting bracket 9 and reinforcing piece 16, therefore the manufacturing material of control box 3, door plate 4, mounting bracket 9 and reinforcing piece 16 is set to stainless steel, and the hardness of control box 3, door plate 4, mounting bracket 9 and reinforcing piece 16 made of stainless steel is stronger, and is not easy to deform, prolongs the service life of control box 3, door plate 4, mounting bracket 9 and reinforcing piece 16.

[0041] The electrical components in the text are all connected with the main controller and 220V mains electricity, and the main controller can be a conventional known device such as a computer.

[0042] In use, the buffer pad 17 is located above the ground, which can provide a buffer function for the base 1, then the touch display screen 6 displays real-time data and setting parameters, the PLC 10 reads the real-time temperature and setting temperature of the temperature controller 7 through RS485 MODBUS-RTU communication protocol, reads the real-time voltage of the induction coil voltmeter 8 of the holding furnace 2, obtains the target voltage through the calculation of the PLC 10, drives the induction transformer 13 through the communication control frequency converter 11, and drives the voltage regulating motor 12 to realize the voltage regulating purpose. The device retains the original system manual control and on-off control function of the temperature controller, only the communication function is added on the original system temperature controller 7 and voltage table 8, the operator does not feel the change of the system, and it is easy to adapt to the new system. The communication control mode makes the line simple and reliable, and the old system can be transformed into a new system in a very short time. Compared with the automatic voltage regulating constant temperature system and the original system temperature controller 7 on-off control horizontal continuous casting line, the transformed horizontal continuous casting line with automatic constant temperature system control has stable casting blank quality, the position of the perforation is stable and close to the edge, and the yield is improved.

[0043] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A horizontal continuous casting holding furnace automatic constant temperature device comprising a base (1), characterized in that: The upper surface of the base (1) is fixedly connected with a heat preservation furnace (2), the right side of the upper surface of the base (1) is fixedly connected with a control box (3), the right side surface of the control box (3) is provided with a rotatable door plate (4), the right side of the front surface of the door plate (4) is provided with a lock body (5), the front surface of the door plate (4) is provided with a touch display screen (6), a temperature control meter (7) and a voltage meter (8), the inner wall of the control box (3) is fixedly connected with a mounting frame (9), the front surface of the mounting frame (9) is fixedly connected with a PLC (10) and a frequency converter (11), the inner wall of the bottom of the control box (3) is fixedly connected with a pressure regulating motor (12) and an induction transformer (13).

2. The automatic constant temperature device of a horizontal continuous casting holding furnace according to claim 1, characterized in that: The upper surface of the control box (3) is provided with an up-down through wiring hole (14).

3. The automatic constant temperature device of a horizontal continuous casting holding furnace according to claim 1, characterized in that: The top of the outer side surface of the control box (3) is provided with left-right through heat dissipation grooves (15), and the number of the heat dissipation grooves (15) is set to be several groups.

4. The automatic constant temperature device of a horizontal continuous casting holding furnace according to claim 1, characterized in that: The bottom of the outer side surface of the heat preservation furnace (2) is fixedly connected with a reinforcing part (16), and the lower surface of the reinforcing part (16) is fixedly connected with the upper surface of the base (1).

5. The automatic constant temperature device of a horizontal continuous casting holding furnace according to claim 1, characterized in that: The lower surface of the base (1) is fixedly connected with a buffer pad (17), and the material of the buffer pad (17) is set to be rubber.

6. The automatic constant temperature device of a horizontal continuous casting holding furnace according to claim 1, characterized in that: The materials of the control box (3), the door plate (4), the mounting frame (9) and the reinforcing part (16) are all set to be stainless steel.

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