CN210287475U - Variable frequency speed regulation device for vacuum carburization process - Google Patents
Variable frequency speed regulation device for vacuum carburization process Download PDFInfo
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- CN210287475U CN210287475U CN201920893293.9U CN201920893293U CN210287475U CN 210287475 U CN210287475 U CN 210287475U CN 201920893293 U CN201920893293 U CN 201920893293U CN 210287475 U CN210287475 U CN 210287475U
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Abstract
The utility model discloses a variable frequency speed adjusting device for vacuum carburization process, including vacuum carburizing furnace and a plurality of radiant tube, still include: a variable frequency speed-regulating fan; the first thermocouple, the second thermocouple and the third thermocouple are arranged at the central positions above, on the side and below the working area; the first heat conduction probe, the second heat conduction probe and the third heat conduction probe are arranged at the center positions of the upper surface, the side surface and the lower surface of the working area; and the fourth thermocouple, the fifth thermocouple and the sixth thermocouple are arranged at the center positions of the upper surface, the side surface and the lower surface of the workpiece in the working area, and each thermocouple and the heat conduction probe are connected with a computer control system. The utility model discloses a variable frequency speed device for vacuum carburization process adjusts the gaseous flow and the pressure of carburizing in the vacuum carburization stove and adjusts the rotational speed of variable frequency speed control fan through computer control system to control the work piece in the intensification of cryrogenic in-process, diffusion and/or refrigerated speed.
Description
Technical Field
The utility model relates to a vacuum carburization technical field especially relates to a variable frequency speed adjusting device for vacuum carburization process.
Background
The vacuum carburization process is a pulse process, i.e., a process in which a strong carburization pulse stage and a diffusion stage are alternately performed. And (3) charging a carburizing agent into the quenching furnace in the strong carburizing stage, stopping charging the carburizing agent in the diffusion stage, pumping out residual gas with low carbon atom content in the quenching furnace through a vacuum pump system to ensure that the furnace reaches a working vacuum degree, and charging new carburizing agent when the next pulse comes so as to uniformly carburize.
The existing vacuum carburizing quenching furnace is generally provided with a stirring fan in the furnace, and the aim is to generate convection in a hearth and to homogenize the atmosphere and temperature in the furnace. However, the existing fan installed in the furnace does not have the speed regulation function, the temperature control mode of the workpiece is controlled by the temperature signal measured by the thermocouple in the working area, and the temperature control mode has the problems that the insertion position of the thermocouple and the flowing change of gas in the furnace have great influence on the measured temperature signal and atmosphere composition, the fluctuation, inaccuracy, lag and the like of the surface temperature and atmosphere of the workpiece are caused, and the uniformity of carburization (nitriding) on the surface of the workpiece and the depth of a carburized layer are seriously influenced. In addition, the control mode is limited due to the adjustment of the rotating speed of the fan, so that the temperature of each part in the furnace and the nonuniformity of the flowing atmosphere cannot be accurately controlled by the rotating speed of the fan, and the nonuniformity of surface carbon, the uniformity of a carburized layer, carbon black carburized and the like of a workpiece in the carburizing or carbonitriding process are caused.
Therefore, it is necessary to develop a variable frequency speed control device of a vacuum carburizing furnace with fast temperature and atmosphere distribution control response and high control precision.
SUMMERY OF THE UTILITY MODEL
The utility model provides a solve the above-mentioned problem among the prior art, provide a variable frequency speed device for vacuum carburization process.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a variable frequency speed device for vacuum carburization process, stretch into the stove and equipartition radiant tube all around at the stove working area in the stove from the stove outside vacuum carburization stove and a plurality of, still include:
a variable frequency speed regulating fan arranged at the top of the vacuum carburizing furnace;
the first thermocouple, the second thermocouple and the third thermocouple are arranged above, beside and below the working area in the central positions and used for detecting the temperatures of the corresponding positions of the working area;
the first heat conduction probe, the second heat conduction probe and the third heat conduction probe are arranged at the center positions of the upper surface, the side surface and the lower surface of the working area one by one and are used for detecting the furnace gas atmosphere at the corresponding positions of the working area; and
the fourth thermocouple, the fifth thermocouple and the sixth thermocouple are arranged at the center positions of the upper surface, the side surface and the lower surface of the workpiece in the working area one by one and are used for detecting the surface temperature of the corresponding position of the workpiece;
the computer control system adjusts the flow and pressure of carburizing gas in the vacuum carburizing furnace and adjusts the rotating speed of the variable-frequency speed-regulating fan according to the temperature and the temperature difference of different parts of each thermocouple measured by the thermocouple and the atmosphere composition and the atmosphere concentration difference of different parts of each heat conduction probe measured by the heat conduction probe, so as to control the heating, diffusion and/or cooling speed of the workpiece in the deep cooling process.
Further, on the variable frequency speed regulation device for the vacuum carburization process, a motor of the variable frequency speed regulation fan is connected with a frequency converter, and the motor is subjected to stepless speed regulation through the frequency converter.
Furthermore, on the variable frequency speed regulation device for the vacuum carburization process, the radiant tube is respectively connected with the nitrogen pipeline and the carburization medium pipeline through a main conveying pipe.
Furthermore, on the variable frequency speed regulating device for the vacuum carburization process, the radiant tube is a hollow electrothermal alloy tube and is vertically distributed in the vacuum carburization furnace.
Further preferably, on the variable frequency speed regulation device for the vacuum carburization process, a plurality of jet holes are formed in the radiant tube, and the plurality of jet holes are distributed at equal intervals.
Furthermore, on the variable frequency speed regulating device for the vacuum carburizing process, a cooling gas pipeline is arranged at the top of the vacuum carburizing furnace.
Furthermore, on the variable frequency speed regulation device for the vacuum carburization process, the bottom of the vacuum carburization furnace is communicated with a vacuum pump through an air exhaust pipeline, an electromagnetic valve is arranged on the air exhaust pipeline, and the electromagnetic valve and the vacuum pump are connected with the computer control system.
Furthermore, on the variable frequency speed regulating device for the vacuum carburizing process, the side wall and the bottom of the vacuum carburizing furnace are respectively hinged with a plurality of adjustable baffles, and the adjustable baffles are connected with a telescopic motor arranged on the outer wall of the vacuum carburizing furnace.
Further preferably, on the variable frequency speed regulating device for the vacuum carburizing process, the adjustable baffle is connected with a telescopic motor arranged on the outer wall of the vacuum carburizing furnace.
Further preferably, on the variable frequency speed regulating device for the vacuum carburization process, the adjusting angle of the adjustable baffle is 0-180 degrees.
Furthermore, on the variable frequency speed regulation device for the vacuum carburization process, the installation position and the angle of the adjustable baffle can be changed according to the requirement of fluid movement, and the uniformity of the surface carburization of the workpiece is ensured by combining the variable frequency speed regulation of the variable frequency speed regulation fan.
Further, on the variable-frequency speed regulation device for the vacuum carburization process, the rotating speed of the variable-frequency speed regulation fan can be regulated in a stepless manner from zero to the maximum rotating speed.
The above technical scheme is adopted in the utility model, compared with the prior art, following technological effect has:
(1) the variable-frequency speed regulating motor is adopted to realize the stepless speed regulation of the fan, so that the atmosphere and the temperature on the surface of the workpiece are more uniform, the deformation of the workpiece caused by nonuniform heating is reduced, and the carburization (nitriding) is more uniform;
(2) adopting a new variable-frequency speed-regulating control mode, respectively arranging a thermocouple and a heat conduction probe at the upper, middle and lower three positions of a working area of the carburizing and quenching furnace, and adopting different speed-controlling modes at different stages;
(3) the computer control system is used for outputting control quantity according to the deviation of the real-time temperature and the set temperature and the deviation of the real-time atmosphere composition and the set atmosphere composition, so that the temperature and the atmosphere of a working area of the carburizing furnace are accurately controlled, the surface of a workpiece is uniformly and stably carburized, and the carburizing quality is improved;
(4) when the gas is cooled, the rotating speed of the variable-frequency speed-regulating fan is regulated by the computer control system according to the error value between the ideal cooling defect and the surface temperature value of the workpiece detected on line so as to regulate the cooling speed of the workpiece, so that the error between a cooling curve and the actual cooling defect is reduced as much as possible, and the controllable cooling of the workpiece is realized;
(5) in the furnace, the uniformity of the surface carburization of the workpiece is ensured by combining the variable frequency speed regulation of the variable frequency speed regulation fan.
Drawings
FIG. 1 is a schematic view of the whole structure of the variable frequency speed control device for vacuum carburization of the present invention;
FIG. 2 is a schematic view of the cross-sectional structure of a radiant tube in the variable frequency speed control device for vacuum carburization of the present invention;
FIG. 3 is a schematic view of the whole structure of the variable frequency speed control device with an adjustable baffle for vacuum carburization of the present invention;
FIG. 4 is a schematic diagram of the control principle of the variable frequency speed control method for the vacuum carburization process according to the present invention;
wherein the reference symbols are:
1-variable frequency speed regulation fan, 2-working area, 3-radiant tube, 4-first thermocouple, 5-second thermocouple, 6-third thermocouple, 7-first heat conduction probe, 8-second heat conduction probe, 9-third heat conduction probe, 10-fourth thermocouple, 11-fifth thermocouple, 12-sixth thermocouple, 13-total conveying pipe, 14-nitrogen pipeline, 15-carburizing medium pipeline, 16-cooling gas pipeline, 17-electromagnetic valve, 18-vacuum pump, 19-jet hole, 20-adjustable baffle plate and 21-telescopic cylinder.
Detailed Description
The present invention will be described in detail and specifically with reference to specific embodiments so as to provide a better understanding of the present invention, but the following embodiments do not limit the scope of the present invention.
Example 1
Referring to fig. 1, a variable frequency speed regulator for vacuum carburizing process is provided, which comprises a vacuum carburizing furnace and a plurality of radiant tubes 3 extending into the furnace from the outside of the furnace and uniformly distributed around a working area 2 in the furnace, and further comprises: a variable frequency speed regulating fan 1 arranged at the top of the vacuum carburizing furnace; the first thermocouple 4, the second thermocouple 5 and the third thermocouple 6 are arranged above, beside and below the working area 2 in the central positions and used for detecting the temperature of the corresponding positions of the working area 2; the first heat conduction probe 7, the second heat conduction probe 8 and the third heat conduction probe 9 are arranged at the center positions of the upper surface, the side surface and the lower surface of the working area 2 one by one and are used for detecting the furnace gas atmosphere at the corresponding positions of the working area 2; and a fourth thermocouple 10, a fifth thermocouple 11 and a sixth thermocouple 12 which are respectively arranged at the center positions of the upper surface, the side surface and the lower surface of the workpiece in the working area 2 and are used for detecting the surface temperature of the corresponding position of the workpiece.
In this embodiment, the first thermocouple 4, the second thermocouple 5, the third thermocouple 6, the fourth thermocouple 10, the fifth thermocouple 11, and the sixth thermocouple 12 in the working area of the vacuum carburizing and quenching furnace are used for the temperature raising stage, the carburizing and the diffusion, and the control of the uniform temperature of the workpiece surface in the cooling stage. The first thermocouple 4, the second thermocouple 5 and the third thermocouple 6 are used for measuring temperature errors of different positions of a working area in real time and are mainly used for controlling the temperature uniformity of the heat treatment furnace in the temperature rising and carburizing stages. The fourth thermocouple 10, the fifth thermocouple 11 and the sixth thermocouple 12 are used for testing the surface temperature of the workpiece, and are mainly used for measuring the change of the surface temperature of the workpiece in the cooling stage, and the standard rotating speed of the fan is adjusted by calculating the error between the change curve of the surface temperature of the workpiece and the ideal cooling curve of the workpiece, so that the error value tends to be minimum, and the controllable cooling of the workpiece is realized. The first heat conduction probe 7, the second heat conduction probe 8 and the third heat conduction probe 9 of the working area of the vacuum carburizing quenching furnace are used for controlling the uniform atmosphere of the surface of the workpiece in the carburizing and nitriding stage. Circulating cooling gas with certain pressure is introduced, and the rotating speed of the fan is adjusted to realize controllable cooling of the workpiece.
In the variable-frequency speed regulation device for the vacuum carburizing process, each thermocouple and each heat conduction probe are connected with a computer control system, and the computer control system adjusts the flow and pressure of carburizing gas in the vacuum carburizing furnace and adjusts the rotating speed of the variable-frequency speed regulation fan 1 according to the temperature of each part and the temperature difference of different parts actually measured by each thermocouple, the atmosphere composition of each part and the atmosphere concentration difference of different parts actually measured by each heat conduction probe, so as to control the heating, diffusion and/or cooling speed of a workpiece in the deep cooling process.
Referring to fig. 1, in the embodiment, the variable-frequency speed control device for the vacuum carburizing process implements a new variable-frequency speed control mode, the thermocouple and the heat conduction probe are respectively arranged at the upper, middle and lower three positions of the working area of the carburizing and quenching furnace, and different speed control modes are adopted at different stages; in the temperature rise stage, speed regulation is carried out according to temperature signals of all parts of the working area and the temperature of the radiant tube; after entering the carburizing stage, carrying out speed regulation and control according to the temperature difference of each part of the working area in the furnace and the atmosphere concentration difference of each part of the working area so as to realize uniform carburization of each part; entering a diffusion stage, and carrying out speed regulation and control according to the temperature difference of each part of a working area in the furnace and referring to the atmosphere concentration difference of each part of the working area to realize uniform diffusion of each part; after the repeated carburization-diffusion stage, the workpiece enters a cooling stage, and the error between the ideal cooling curve and the actual cooling curve is reduced as much as possible by adjusting the rotating speed of the fan according to the error between the ideal cooling curve of the workpiece and the temperature change curve actually measured by the thermocouple, so that the workpiece is cooled controllably.
Referring to fig. 1, in this embodiment, a motor of the variable-frequency speed-regulating fan 1 is connected to a frequency converter, the motor is subjected to stepless speed regulation through the frequency converter, the motor is connected to a variable-frequency power supply, and the motor is located outside a furnace body and connected to a fan inside the furnace. The speed of the motor can be adjusted steplessly from zero to the maximum speed. The stepless speed regulation of the motor of the variable-frequency speed regulation fan 1 is controlled by a frequency converter, when the motor drives the fan to rotate, the frequency and the amplitude of the working voltage of the alternating current motor are changed by the frequency converter, and then the stepless speed regulation of the fan is controlled, so that the temperature and the atmosphere of a working area in a furnace are more uniform and accurate.
In this embodiment, the variable frequency speed control device for the vacuum carburization process adopts a stepless speed control mode, which is different from the traditional speed control device, the motor of the variable frequency speed control fan 1 is externally connected with a variable frequency power supply, and the motor of the variable frequency speed control fan 1 is positioned outside the furnace body and connected with the fan in the furnace. The workpieces are sequentially placed in a working area of a vacuum furnace, a furnace door is closed, vacuumizing is started, the pressure index reaches below 10Pa, nitrogen is introduced to reach a certain pressure, and control parameters are input. And starting heating, properly adjusting the rotating speed of the variable-frequency speed-regulating fan 1 and accelerating the heating rate. When the temperature reaches the carburizing temperature, the temperature-raising gas is extracted. Adopting a pulse carburizing mode, introducing carburizing gas and keeping the carburizing pressure between 1000Pa and 2000 Pa. According to the comparison of actual temperature measured by each thermocouple and control temperature, the rotating speed of the fan is properly adjusted, and the gas circulation rate is changed, so that the temperature difference of each surface of the workpiece is within a reasonable range, and the uniform and accurate carburization is ensured. The actual atmosphere composition at each position is measured by the heat conduction probes at each position to assist in adjusting the rotating speed of the fan. The thermocouple and the heat conduction probe are respectively arranged at the upper part, the side surface and the lower part of the working area. The measured data is transmitted to a computer control system in real time for monitoring.
Referring to fig. 1 and 2, in the present embodiment, the radiant tube 3 is connected to the nitrogen pipe 14 and the carburizing medium pipe 15 through a main delivery pipe 13, the nitrogen pipe 14, and the carburizing medium pipe 15 are all provided with flow meters, and nitrogen is provided as a cold source through the nitrogen pipe 14; the carburizing medium is supplied through a carburizing medium conduit 15.
Referring to fig. 1 and 2, in the present embodiment, the radiant tube 3 is a hollow electrothermal alloy tube and is vertically distributed in the vacuum carburizing furnace; a plurality of jet holes 19 are formed in the radiant tube 3, the jet holes 19 are distributed at equal intervals, and the radiant tubes 3 of different sizes and models can be replaced according to the requirement of workpiece treatment.
Referring to fig. 1 and 2, in the present embodiment, a cooling gas duct 16 is disposed at the top of the vacuum carburizing furnace, and when a workpiece is cooled, cooling gas is introduced from the cooling gas duct 16 at the top of the carburizing furnace, and is accelerated by a variable frequency speed regulation fan 1 to cool the workpiece. In the gas quenching process, the heat of the workpiece is mainly taken away by the forced convection of cooling gas.
In this embodiment, in step S4, in the cooling stage, a cooling gas with a certain pressure and temperature is introduced, and the cooling rate of the workpiece is adjusted by controlling the rotation speed of the variable-frequency adjustable-speed fan 1, so as to realize controllable cooling of the workpiece. Specifically, in this embodiment, by introducing cooling gas with a certain pressure and temperature, the cooling air flows along the designed air channel under the action of the fan, and generates convection heat exchange with the workpiece when flowing through the surface of the workpiece, so as to reduce the temperature of the workpiece. When the cooling gas absorbs the heat of the workpiece and the temperature of the cooling gas rises to a certain temperature, the cooling gas is discharged out of the furnace to be cooled, and meanwhile, the cooling gas is supplemented from a cooling gas pipeline 16 at the top of the furnace.
Referring to fig. 1 and 2, in the present embodiment, the bottom of the vacuum carburizing furnace is communicated with a vacuum pump 18 through an air exhaust pipeline, an electromagnetic valve 17 is installed on the air exhaust pipeline, the electromagnetic valve 17 and the vacuum pump 18 are connected with the computer control system, and the vacuum carburizing furnace is evacuated through the vacuum pump 18 to control the atmosphere and pressure in the furnace.
Example 2
Different from the embodiment 1, referring to fig. 3, in this embodiment, a plurality of adjustable baffles 20 are respectively hinged on the side wall and the bottom of the vacuum carburizing furnace, and the adjustable baffles 20 are connected with a telescopic motor 21 arranged on the outer wall of the vacuum carburizing furnace. The adjustable baffle 20 is arranged in a certain direction in the furnace, and the atmosphere in the furnace can flow according to a set channel when flowing through the adjustable baffle 20, so that the atmosphere in the furnace is uniform, and dead angles are avoided. The installation position and the angle of the adjustable baffle 20 can be changed according to the requirement of fluid movement, and the uniformity of the surface carburization of the workpiece is ensured by combining the variable frequency speed regulation of the variable frequency speed regulation fan 1.
In this example, the inclination angle of the adjustable baffle 20 is adjusted by a telescopic motor 21 on the outer wall of the vacuum carburizing furnace, and the adjustment angle of the adjustable baffle 20 is 0-180 °.
Example 3
Referring to fig. 4, based on the variable frequency speed control device for vacuum carburizing process provided in embodiment 1 or embodiment 2, this embodiment provides a variable frequency speed control method for vacuum carburizing process, including the following steps:
s1, in the temperature rising stage, carrying out speed regulation and control on the carburizing process according to the temperature signals of all parts of the working area and the temperature of the radiant tube;
s2, after entering the carburizing stage, carrying out speed regulation and control according to the temperature difference of each part in the working area in the furnace and the atmosphere concentration difference of each part in the working area, and realizing uniform carburizing of each part;
s3, entering a diffusion stage, and performing speed regulation and control according to the temperature difference of each part of the working area in the furnace and by referring to the atmosphere concentration difference of each part of the working area to realize uniform diffusion of each part;
and S4, after the repeated carburization-diffusion stage, entering a cooling stage, and according to the error between the ideal cooling curve of the workpiece and the temperature change curve actually measured by the thermocouple, reducing the error between the ideal cooling curve and the actual cooling curve by adjusting the rotating speed of the variable-frequency speed-regulating fan 1, thereby realizing the controllable cooling of the workpiece.
In the embodiment, in step S4, in the cooling stage, a circulating cooling gas with a certain pressure is introduced, and the cooling rate of the workpiece is adjusted by controlling the rotation speed of the variable-frequency adjustable-speed fan (1), so as to realize the controllable cooling of the workpiece.
In this embodiment, in steps S1-S4, the installation position and angle of the adjustable baffle 20 can be changed according to the requirement of fluid movement, and the uniformity of workpiece surface carburization is ensured in combination with the variable frequency speed control of the variable frequency speed control fan 1.
In this embodiment, in step S4, the rotation speed of the vffan 1 may be adjusted in a stepless manner from zero to the maximum rotation speed.
Therefore, the variable-frequency speed regulation fan 1 is used for stepless speed regulation, the rotating speed of the fan is properly regulated, the atmosphere and the temperature on the surface of the workpiece are more uniform, the deformation of the workpiece caused by nonuniform heating is reduced, and the carburization (nitriding) is more uniform and accurate. When the gas is cooled, the rotating speed of the fan is adjusted to accelerate the cooling speed of the workpiece to inhibit carbide precipitation, so that the carburizing quality of the workpiece is improved.
Meanwhile, in the new variable-frequency speed-regulating control mode provided by the embodiment, the thermocouple and the heat conduction probe are respectively arranged at the upper, middle and lower three positions of the working area of the carburizing and quenching furnace, different speed control modes are adopted at different stages, and the speed control is carried out at the temperature rise stage according to the temperature signals of all parts of the working area and the temperature of the heating pipe. And after entering a constant temperature stage, controlling the speed according to temperature signals of all parts of a working area in the furnace, and carrying out speed control by referring to the atmosphere concentration difference of all parts of the working area.
Because the positions of the thermocouple and the heat conduction probe are fixed, the deviation between the real-time temperature and the set temperature and the real-time atmosphere composition and the set atmosphere composition are calculated by using a computer algorithm according to the temperature and the atmosphere composition of each part to output a control quantity, so that the temperature and the atmosphere of a working area of the carburizing furnace are accurately controlled. The carburization of the surface of the workpiece can be ensured to be uniform and stable, and the carburization quality is improved.
In addition, please refer to fig. 4, which is a schematic diagram of a control system of a variable frequency speed control device of a vacuum carburizing furnace, wherein the main control parameters include a working area temperature, a working area pressure, a working area atmosphere, a carburizing source gas, a cooling gas, a fan rotation speed, and the like, wherein the working area temperature, the working area pressure, and the working area atmosphere are set according to the requirements of the vacuum carburizing process. The carburizing source gas flow, the cooling gas flow and the fan rotating speed are adjusted in real time according to the actually measured working area temperature, the actually measured working area pressure and the errors between the working area atmosphere and the set target value, so that the error values are within the error set by the computer control system. As shown in fig. 4, the pressure of the working area is detected by a pressure detecting unit provided to the working area; the temperature of the working area is detected by a temperature detection unit consisting of corresponding thermocouples; and the atmosphere of the working area is detected by each heat conduction probe.
The technological parameters controlled in different stages of vacuum carburization are different, and in the temperature rise stage, the heating power of each radiant tube is mainly controlled by a temperature control unit to control the uniform temperature rise of each part of a working area, so that the temperature rise rate of the quenching furnace is controlled; the temperature rising rate of the working area in the computer control system has a set value and a fluctuation range, an error delta si between the actually measured temperature rising rate of the working area and the set temperature rising rate is IRs-RiI, wherein Rs and Ri are the temperature rising rate set by the system and the actually measured temperature rising rate respectively, and I is an operation sign for taking an absolute value of an error value. In addition, the temperature rise rates of different positions of the working area are different, fluctuation errors δ i 12-IRi 1-Ri2I, δ i 13-IRi 1-Ri3I and δ i 23-IRi 2-Ri3I also exist, wherein Ri1, Ri2 and Ri3 are the temperature rise rates of different positions of the working area measured by the first thermocouple 4, the second thermocouple 5 and the third thermocouple 6 respectively. The error between the temperature rising rate actually measured by the computer control system and the temperature rising rate set by the system is controlled by adjusting the input power and the fan rotating speed of the vacuum furnace in real time to control delta si, delta i12, delta i13 and delta i23 within the error range set by the system through a control algorithm in the system, so that the temperature of the vacuum furnace is controlled in the temperature rising stage.
In other control phases, the control principle of the computer control system is the same, except that the parameters of the control are different. For example, in the carburizing stage and the diffusion stage, three parameters of working area temperature, working area pressure and working area atmosphere are mainly controlled, and the three parameters are mainly controlled by adjusting the rotating speed of a fan, the flow rate of carburizing gas and the input power of a vacuum furnace, or the inclination of an adjustable baffle is also controlled by a baffle driving unit; for another example, in the cooling stage, the cooling rate of the workpiece surface is controlled, corresponding to the temperature rise process, a set cooling rate of the workpiece surface is provided inside the system, the temperatures of the workpiece surfaces at different positions are measured in real time by the fourth thermocouple 10, the fifth thermocouple 11 and the sixth thermocouple 12, and the three thermocouples are fixed on the surfaces of the workpieces at three different positions. Similarly, the measured cooling rate has an error δ csi ═ IRcs-Rci from the set cooling rate, where Rcs and Rci are the system set cooling rate and the measured cooling rate, respectively. In addition, the cooling rates of different positions of the working area are different, and fluctuation errors δ ci 12-IRci 1-Rci2I, δ ci 13-IRci 1-Rci3I and δ ci 23-IRci 2-Rci3I also exist, wherein Rci1, Rci2 and Rci3 are the cooling rates of different positions of the working area measured by the fourth thermocouple 10, the fifth thermocouple 11 and the sixth thermocouple 12 respectively.
The above detailed description of the embodiments of the present invention is only for exemplary purposes, and the present invention is not limited to the above described embodiments. Any equivalent modifications and substitutions to those skilled in the art are also within the scope of the present invention. Accordingly, variations and modifications in equivalents may be made without departing from the spirit and scope of the invention, which is intended to be covered by the following claims.
Claims (10)
1. The utility model provides a variable frequency speed adjusting device for vacuum carburization process, includes vacuum carburizing furnace and a plurality of stretches into the stove and the equipartition is in stove workspace (2) radiant tube (3) all around from the stove outside, its characterized in that still includes:
a variable frequency speed regulating fan (1) arranged at the top of the vacuum carburizing furnace;
the first thermocouple (4), the second thermocouple (5) and the third thermocouple (6) are arranged above, on the side of and at the center of the lower part of the working area (2) one by one and used for detecting the temperature of the corresponding position of the working area (2);
the first heat conduction probe (7), the second heat conduction probe (8) and the third heat conduction probe (9) are arranged at the center positions of the upper surface, the side surface and the lower surface of the working area (2) one by one and are used for detecting the furnace gas atmosphere at the corresponding positions of the working area (2); and
the fourth thermocouple (10), the fifth thermocouple (11) and the sixth thermocouple (12) are arranged at the center positions of the upper surface, the side surface and the lower surface of the workpiece in the working area (2) one by one and are used for detecting the surface temperature of the corresponding position of the workpiece;
the computer control system adjusts the flow and pressure of carburizing gas in the vacuum carburizing furnace and adjusts the rotating speed of the variable-frequency speed-regulating fan (1) according to the temperature and the temperature difference of different parts of each thermocouple measured by the thermocouple and the atmosphere composition and the atmosphere concentration difference of different parts of each heat conduction probe measured by the heat conduction probe, so as to control the heating, diffusion and/or cooling speed of the workpiece in the deep cooling process.
2. The variable-frequency speed regulation device for the vacuum carburization process according to claim 1, characterized in that a motor of the variable-frequency speed regulation fan (1) is connected with a frequency converter, and the motor is subjected to stepless speed regulation through the frequency converter.
3. Variable frequency speed device for vacuum carburization process according to claim 1, characterized in that the radiant tubes (3) are connected with nitrogen gas pipe (14) and carburization medium pipe (15) through a main feed pipe (13), respectively.
4. The variable frequency speed control device for the vacuum carburization process according to claim 1, characterized in that the radiant tube (3) is a hollow electrothermal alloy tube and is vertically arranged in the vacuum carburization furnace.
5. The variable frequency speed regulating device for the vacuum carburization process according to claim 1, characterized in that a plurality of jet holes (19) are formed in the radiant tube (3), and the plurality of jet holes (19) are equidistantly distributed.
6. The variable frequency speed control device for vacuum carburizing process according to claim 1, characterized in that a cooling gas pipe (16) is provided at the top of the vacuum carburizing furnace.
7. The variable-frequency speed regulation device for the vacuum carburization process according to claim 1, characterized in that the bottom of the vacuum carburization furnace is communicated with a vacuum pump (18) through an air exhaust pipeline, an electromagnetic valve (17) is arranged on the air exhaust pipeline, and the electromagnetic valve (17) and the vacuum pump (18) are connected with the computer control system.
8. The variable frequency speed control device for the vacuum carburization process according to claim 1, characterized in that a plurality of adjustable baffles (20) are respectively hinged on the side wall and the bottom of the vacuum carburization furnace.
9. The variable frequency speed control device for vacuum carburizing process according to claim 8, wherein the adjustable baffle (20) is connected with a telescopic motor (21) arranged on the outer wall of the vacuum carburizing furnace.
10. The variable frequency speed device for vacuum carburization process according to claim 9, characterized in that the adjustment angle of said adjustable baffle (20) is 0-180 °.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110144545A (en) * | 2019-06-14 | 2019-08-20 | 上海颐柏科技股份有限公司 | A kind of frequency converter and its speed regulating method for vacuum carburization process |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110144545A (en) * | 2019-06-14 | 2019-08-20 | 上海颐柏科技股份有限公司 | A kind of frequency converter and its speed regulating method for vacuum carburization process |
| WO2020248850A1 (en) * | 2019-06-14 | 2020-12-17 | 上海颐柏科技股份有限公司 | Frequency variable speed regulating device for vacuum carburizing process and speed regulating method therefor |
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