CN211924865U

CN211924865U - Dry oil lubrication constant-temperature electrical control system of heavy-load transmission equipment

Info

Publication number: CN211924865U
Application number: CN202020562741.XU
Authority: CN
Inventors: 张炜; 昝卫华; 黄国强; 陆学龙; 高映
Original assignee: Anhui Magang Equipment Maintenance Co ltd
Current assignee: Anhui Magang Equipment Maintenance Co ltd
Priority date: 2020-04-15
Filing date: 2020-04-15
Publication date: 2020-11-13
Anticipated expiration: 2030-04-15

Abstract

The utility model discloses a dry oil lubrication constant temperature electrical control system of heavy load transmission equipment, which belongs to the technical field of electric control equipment of a sintering heavy load transmission equipment lubricating oil station, is suitable for the application of a PID control technology of a frequency converter of temperature control equipment, replaces the traditional relay control mode with the frequency conversion control technology, and drives a heater with the frequency converter; the programmable controller is used for replacing a relay, related protection and monitoring programs are added, the conversion of normal starting of a frequency converter of a lubricating oil heating system and fault self-starting of the frequency converter is realized before and during operation of heavy-duty transmission equipment in winter or in a region with lower temperature, the real-time monitoring and control of the temperature of an oil way are realized, the PID closed-loop control is realized, the uninterrupted constant-temperature work of the whole system is ensured, the operation cost is greatly reduced, the control is reliable, and the maintenance is more convenient.

Description

Dry oil lubrication constant-temperature electrical control system of heavy-load transmission equipment

Technical Field

The utility model belongs to the technical field of sintering heavy load transmission equipment lubricating oil station electrical equipment, a lubricated constant temperature electrical control system of heavy load transmission equipment drier oil is related to, is applicable to temperature control equipment converter PID control technology and uses.

Background

Traditional heavy load transmission equipment often need provide the drier oil circulation lubrication to rotating part in service, can effectively ensure heavy load transmission equipment's normal operating like this, reduce the occurence of failure to effectively improve heavy load transmission equipment's life, but when shutting down, these lubricating oil just are detained in heavy load transmission equipment, if: motor bearing bushes, reduction boxes and the like. In areas with higher temperature, the lubricating oil retained in the heavy-duty transmission equipment can be reused after the heavy-duty transmission equipment is restarted, but in areas with lower temperature or in areas with higher temperature, the circulating lubricating oil retained in the heavy-duty transmission equipment is easy to freeze, and the damage to the transmission part of the equipment is easily caused when the heavy-duty transmission equipment is restarted. At present, the conventional solution to the problem is to provide a start-stop circulating oil heating and supplying system for heavy-duty transmission equipment, but after the area with lower temperature or other areas enters winter, a specially-assigned person needs to be sent to watch the start-stop circulating oil heating and supplying system for 24 hours, so that not only is human resources wasted, but also the heating time control human factor of start-stop circulating lubricating oil is large, and the possibility of overload damage of the equipment is increased.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the background technology, the utility model provides a constant temperature electric control system for the dry oil lubrication of heavy-duty transmission equipment, which replaces the traditional relay control mode with the frequency conversion control technology and drives a heater with a frequency converter; the programmable controller is used for replacing a relay, related protection and monitoring programs are added, the conversion of normal starting of a frequency converter of a lubricating oil heating system and fault self-starting of the frequency converter is realized before and during operation of heavy-duty transmission equipment in winter or in a region with lower temperature, the real-time monitoring and control of the temperature of an oil way are realized, the PID closed-loop control is realized, the uninterrupted constant-temperature work of the whole system is ensured, the operation cost is greatly reduced, the control is reliable, and the maintenance is more convenient.

The utility model provides a technical problem's technical scheme as follows:

the utility model relates to a heavy load transmission equipment grease lubrication constant temperature electrical control system, including the oil conservator, characterized by, still include first power, second power, PLC controller, power frequency heating contactor, converter, temperature control relay, signal isolation distributor, oil conservator and external control unit; a heater and a thermocouple are arranged in the oil storage cabinet; the power frequency heating contactor and the frequency converter are respectively connected with the heater through a circuit, and a variable frequency heating contactor is arranged on the circuit between the frequency converter and the heater; the first power supply is respectively connected with the PLC, the power frequency heating contactor, the frequency converter, the temperature control relay and the external control unit through circuits; the second power supply is connected with the signal isolation distributor through a line; the power frequency heating contactor, the frequency converter, the variable frequency heating contactor, the temperature control relay, the signal isolation distributor and the external control unit are respectively connected into the PLC through circuits; the thermocouple and the signal isolation distributor are respectively connected with the temperature control relay through a circuit, and the signal isolation distributor is also connected with the frequency converter through a circuit.

As the utility model discloses technical scheme's further improvement, power frequency heating contactor, variable frequency heating contactor and heater connection's circuit on still be provided with overload relay, this overload relay passes through the circuit and inserts the PLC controller.

As the further improvement of the technical scheme of the utility model, first power and second power are three-phase 220V alternating current power supply and 24V DC power supply respectively.

As the utility model discloses technical scheme's further improvement, the outer accuse unit includes auxiliary contact on selector switch, starting switch, stop switch and the overload relay.

As the utility model discloses technical scheme's further improvement, still be provided with heating pilot lamp and alarm indicator through the line connection on the PLC controller.

As a further improvement of the technical solution of the present invention, the PLC controller is selected from a mitsubishi FX2N system small-sized machine, the frequency converter is selected from a mitsubishi FR-E700 series frequency converter, the temperature control relay is selected from a schneider RGE48 series temperature control relay, the signal isolation distributor is KYP-a420-2a420-D, and the start switch and the stop switch are respectively a normally open switch and a normally closed switch; the three phase lines of the first power supply are respectively L1, L2 and L3; r, S and T terminals of the frequency converter are respectively connected with three phase lines of L1, L2 and L3 of a first power supply, U, V and W output terminals of the frequency converter are respectively connected with the heater through three lines, the three lines are respectively connected with three groups of normally open contacts of the frequency conversion heating contactor and three groups of main contacts of the overload relay, STF terminals, RH terminals and SD terminals of the frequency conversion heating contactor are respectively connected with Y000, Y001 and COM1 output terminals of the PLC, and A, B and C fault output terminals of the frequency converter are connected with the PLC; three lines are correspondingly connected between the R, S three-phase line connected with the T terminal of the frequency converter and three lines between the variable-frequency heating contactor and the overload relay of the frequency converter respectively, and the three lines are respectively connected with three groups of normally open contacts of the power-frequency heating contactor; the L terminal of the PLC controller is connected with a phase line of a first power supply, the N terminal of the PLC controller is connected with a zero line, the X000 input terminal and the X001 input terminal of the PLC controller are respectively connected with two immovable ends of a selector switch SA, the X002, X003, X004, X005 and X006 input terminals of the PLC controller are respectively connected with a starting switch, a stopping switch, an overload protection switch of an overload relay, a high-temperature normally closed contact and a low-temperature normally open contact which are arranged in a temperature control relay, a 220V alternating current power supply is connected between the other ends of the selector switch, the starting switch, the stopping switch, an auxiliary contact of the overload relay, the high-temperature normally closed contact and the low-temperature normally open contact and a COM terminal of the selector switch, the starting switch, the stopping switch, the overload relay, and the auxiliary contact, the high-temperature normally closed contact and the low-temperature normally open contact of the selector switch, the auxiliary contact, the high, A 220V alternating current power supply is connected between the other ends of the heating indicator lamp and the alarm indicator lamp and the COM2 terminal; the input terminal of the signal isolation distributor is connected with the output terminal of the temperature control relay through a line, one path of the output terminal of the signal isolation distributor is connected to an A/D input module of the PLC controller through the line, and the other path of the output terminal of the signal isolation distributor is connected to a terminal and a terminal of the frequency converter; the thermocouple is connected with an input terminal of the temperature control relay through a circuit; the temperature control relay is connected with a 220V alternating current power supply through a line.

As the utility model discloses technical scheme's further improvement, the initiating terminal of the L1, L2 and the L3 three-phase line of first power still is provided with automatic switch.

As a technical scheme the utility model further improves, be provided with the fuse on the circuit between the L terminal of PLC controller and a certain phase line of first power.

As the technical scheme of the utility model further improve, 220V alternating current power supply comprises a certain phase line and a zero line of first power.

Compared with the prior art, a lubricated constant temperature electrical control system of heavy load transmission equipment drier oil possess following advantage:

(1) the dry oil lubrication constant-temperature electrical control system for the heavy-duty transmission equipment has the advantages of novel and reasonable structural design, simple and rapid arrangement, low manufacturing, operation and maintenance cost, reliable control and good effect, and all components are common products in the electrical field;

(2) the utility model controls the heater in the oil conservator by adding the PLC controller and the frequency converter, effectively realizes the constant temperature uninterrupted working mode of the dry oil circulating lubrication, meanwhile, the working temperature of the heater is fed back to the frequency converter and the PLC in real time by utilizing the thermocouple, the PID function of the frequency converter is set to realize the closed-loop control of the real-time temperature of the lubricating oil in the oil conservator and the heater, when the temperature of the working oil exceeds a set value, the frequency converter drives the output voltage (frequency) of the heater to gradually decrease so as to ensure enough oil supply temperature, when the temperature of the working oil gradually drops, the frequency converter drives the output voltage (frequency) of the heater to gradually increase to the normal heating temperature, the heater always works during the period, the constant temperature system is continuously produced, special personnel does not need to be arranged for watching, the labor cost is reduced, and the possibility that the heavy-load transmission equipment is damaged due to human factors is avoided;

(3) the utility model discloses a heavy load transmission equipment drier oil lubrication constant temperature electrical control system has added power frequency operation switching control circuit for when the converter trouble, automatic switch-over to power frequency operation mode;

(4) heavy load transmission equipment grease lubrication constant temperature electrical control system added the on-the-spot start unit for pass through PLC controller and power frequency heating contactor control grease lubrication constant temperature electrical control system power frequency operation when converter is maintained or is out of order, in order to ensure the temperature of grease.

Drawings

The invention will be further explained with reference to the drawings and the detailed description below:

fig. 1 is a schematic view of the process control of the dry oil lubrication constant temperature electrical control system of the heavy load transmission equipment according to the present invention;

fig. 2 is a schematic connection diagram of a dry oil lubrication constant temperature electrical control system of heavy-duty transmission equipment according to the present invention;

fig. 3 is a secondary wiring diagram of the dry oil lubrication constant temperature electrical control system of the heavy load transmission equipment of the present invention;

in the figure: 1. the system comprises a first power supply, a second power supply, a PLC (programmable logic controller), a frequency converter, a temperature control relay, a signal isolation distributor, a fuel storage cabinet, an external control unit, a heater, a thermocouple, an 11.220V alternating current power supply, an SA (selective switch), an SB1 starting switch, an SB2 stopping switch, a KH. overload relay, a KM1 power frequency heating contactor, a KM2 frequency conversion heating contactor, an LD1 heating indicator lamp, an LD2 alarm indicator lamp, a QA1 automatic switch and a FU. fuse.

Detailed Description

Example 1:

as shown in fig. 1 to 3, the utility model relates to a lubricated constant temperature electrical control system of heavy load transmission equipment drier oil, including being used for depositing the oil conservator 7 of drier oil, its innovation point is, still include first power 1, second power 2, PLC controller 3, power frequency heating contactor KM1, converter 4, temperature control relay 5, signal isolation distributor 6, oil conservator 7 and external control unit 8; a heater 9 and a thermocouple 10 are arranged in the oil conservator 7; the power frequency heating contactor KM1 and the frequency converter 4 are respectively connected with the heater 9 through lines, and a variable frequency heating contactor KM2 is arranged on the line between the frequency converter 4 and the heater 9; the first power supply 1 is respectively connected with the PLC 3, the power frequency heating contactor KM1, the frequency converter 4, the temperature control relay 5 and the external control unit 8 through circuits and is used for providing required power supplies for the components; the second power supply 2 is connected with the signal isolation distributor 6 through a line and is used for providing required power supply for the signal isolation distributor 6; the power frequency heating contactor KM1, the frequency converter 4, the frequency conversion heating contactor KM2, the temperature control relay 5, the signal isolation distributor 6 and the external control unit 8 are respectively connected to the PLC controller 3 through circuits; the thermocouple 10 and the signal isolation distributor 6 are respectively connected with the temperature control relay 5 through lines, and the signal isolation distributor 6 is also connected with the frequency converter 4 through lines. In this embodiment, the heater 9 is used for heating the dry oil in the oil conservator 7 to avoid the dry oil freezing phenomenon; the thermocouple 10 is used for transmitting the oil temperature collected in real time to the temperature control relay 5; the PLC is used for controlling the whole dry oil lubrication constant-temperature electric control system of the heavy-duty transmission equipment; the power frequency heating contactor KM1 and the variable frequency heating contactor KM2 are respectively used for controlling the constant temperature electrical control system to operate in a power frequency mode or in a variable frequency mode; the temperature control relay 5 is used for receiving an oil temperature signal transmitted by the thermocouple 10 and transmitting the oil temperature signal to the signal isolation distributor 6, meanwhile, the temperature control relay 5 can set an upper limit value and a lower limit value of the temperature and compare a temperature value transmitted by the thermocouple 10 with the upper limit value and the lower limit value, and if the temperature value is higher than the upper limit value or lower than the lower limit value, the two signals are transmitted to the PLC 3; the signal isolation distributor 6 is used for receiving the oil temperature signal transmitted by the temperature control relay 5 and dividing the oil temperature signal into two paths to be respectively transmitted to the PLC controller 3 and the frequency converter 4; the frequency converter 4 is used for adjusting an output signal to the heater 9 according to a received oil temperature signal so as to realize that the heater 9 can adjust output voltage (frequency) in real time according to the oil temperature, and further control the oil temperature in the oil storage cabinet 7 to be in a normal heating range, and related parameters can be set in a self-contained PID function of the frequency converter 4 in advance before the frequency converter is applied so as to realize PID closed-loop control of dry oil constant temperature; the external control unit 8 is used for inputting instructions to the PLC 3 so as to enable the constant-temperature electric control system to complete corresponding functions; when the device is applied, the PLC 3 controls the power frequency heating contactor KM1 to be disconnected and the variable frequency heating contactor KM2 to be closed, the constant temperature electric control system is controlled to be in a variable frequency working mode, the thermocouple 10 transmits an oil temperature signal acquired in real time to the temperature control relay 5, the temperature control relay 5 transmits the oil temperature signal to the signal isolation distributor 6, the signal isolation distributor 6 divides the oil temperature signal into two paths, one path is transmitted to the PLC 3 for real-time monitoring of the oil temperature, the other path is transmitted to the frequency converter 4 for realizing constant temperature PID closed loop control of uninterrupted operation of the heater 9 through the frequency converter 4, when the frequency converter 4 is in a normal working state, the frequency converter 4 carries out variable frequency regulation according to the height of the oil temperature through the self-provided PID function, and controls the heater 9 to gradually reduce or gradually increase the output voltage (frequency), so that the dry oil in the oil conservator 7 is restored to the normal heating temperature; when the frequency converter 4 has a fault, the fault information is transmitted to the PLC controller 3, the PLC controller 3 controls a power frequency heating contactor KM1 and a frequency conversion heating contactor KM2 to be respectively attracted and disconnected, the constant temperature electrical control system is controlled to be in a power frequency working mode, the working mode is an automatic operation mode of a low-temperature starting heater 9 and a high-temperature stopping heater 9, specifically, a thermocouple 10 transmits an oil temperature signal acquired in real time to a temperature control relay 5, the temperature control relay 5 compares the transmitted temperature value with the upper limit value and the lower limit value of the preset oil temperature, if the temperature value is higher than the upper limit value, the signal is transmitted to the PLC controller 3, the PLC controller 3 controls a power frequency heating contactor KM1 to be disconnected, the heater 9 is powered off and stops working, and after the oil temperature is lower than the lower limit value of the temperature control relay 5, the signal is transmitted to the PLC controller 3, and the PLC controller 3 controls the power frequency heating, the heater 9 is powered up again to start the operation, thereby circulating.

In this embodiment, for guaranteeing heater 9's normal work, power frequency heating contactor KM1, frequency conversion heating contactor KM2 still be provided with overload relay KH on the circuit of being connected with heater 9, this overload relay KH passes through circuit access PLC controller 3, when the circuit of being connected with heater 9 transships, overload relay KH disconnection, transmit overload signal for PLC controller 3 simultaneously, PLC controller 3 controls power frequency heating contactor KM1 and frequency conversion heating contactor KM2 disconnection to protect entire system.

In this embodiment, the first power supply 1 and the second power supply 2 are a three-phase 380V ac power supply and a 24V dc power supply, respectively.

In this embodiment, the external control unit 8 includes an auxiliary contact on a selection switch SA, a start switch SB1, a stop switch SB2, and an overload relay KH; the selection switch SA is used for switching a frequency conversion working mode and a power frequency working mode of the constant-temperature electrical control system, and is in the frequency conversion working mode during normal use, and can be switched to the power frequency working mode during maintenance or failure of a frequency converter; the starting switch SB1 and the stopping switch SB2 are used for starting and stopping the operation of the constant-temperature electric control system in a power frequency working mode; the auxiliary contact on overload relay KH is connected in series to enter a PLC controller, when the overload relay KH can be used in a power frequency or frequency conversion working mode, an overload signal is transmitted to the PLC controller when an overload condition occurs, and the PLC controller switches off the power frequency heating contactor KM1 or the frequency conversion heating contactor KM2 to stop the constant-temperature electrical control system.

In this embodiment, a heating indicator light LD1 and an alarm indicator light LD2 are further arranged on the PLC controller 3 through line connection, the alarm indicator light LD2 is used for being turned on when the frequency converter 4 is in a fault, and the heating indicator light LD1 is used for being turned on when the heater 9 works.

Example 2:

basically, as shown in fig. 1 to 3, in embodiment 1, the present embodiment mainly performs model selection and wiring on each component in embodiment 1. Because the electrical control of the dry oil lubrication constant-temperature electrical control system of the heavy-duty transmission equipment is simpler, and the number of I/O points required for modification is small, the PLC 3 adopts a Mitsubishi FX2N system small machine; the oil station load of the heavy-duty equipment is small, the starting performance requirement is not very high, the frequency converter 4 is a Mitsubishi FR-E700 series frequency converter, the power is 5.5KW, and the frequency converter is provided with a PID function; the temperature control relay 5 is a Schneider RGE48 series temperature control relay, the upper and lower limit values of the temperature can be set, the temperature can be adjusted at 0-99 ℃, and signals of the upper and lower limit values are transmitted to the PLC 3 through a built-in high-temperature normally closed contact T1 and a built-in low-temperature normally open contact T2; the signal isolation distributor 6 is KYP-A420-2A420-D in model and is used for outputting two paths of 4-20 mA analog signals, one path of analog signals is input into an A/D input module of the PLC 3 and is used for monitoring the oil temperature of heavy-duty transmission equipment in real time, and the other path of analog signals is input into the frequency converter 4, so that the constant-temperature PID closed-loop control of the frequency converter 4 on the uninterrupted operation of the heater 9 is realized; the selection switch SA is a single-pole double-throw switch; the starting switch SB1 and the stopping switch SB2 are respectively a normally open switch and a normally closed switch; the first power supply 1 is an AC380V power supply, and three phase lines of the first power supply are L1, L2 and L3 respectively; r, S and T terminals of the frequency converter 4 are respectively connected with three phase lines of L1, L2 and L3 of the first power supply 1, U, V and W output terminals are respectively connected with the heater 9 through three lines, the three lines are respectively connected with three groups of normally open contacts of the variable frequency heating contactor KM2 and three groups of main contacts of the overload relay KH, STF terminals, RH terminals and SD terminals are respectively connected with Y000, Y001 and COM1 output terminals of the PLC controller 3 for receiving a frequency converter operation instruction and a PID control instruction output by the PLC controller 3, A, B and C fault output terminals are connected with the PLC controller 3 for transmitting a fault signal to the PLC controller 3 when the frequency converter 4 is in fault so that the PLC controller 3 controls the constant temperature electric control system to be operated from a frequency conversion mode to a power frequency mode, thereby ensuring the normal operation safety of the heavy-load transmission equipment, the A, B and C terminal connection mode is connected with the input terminal of the PLC controller according to the function requirement, generally, the A terminal is a normally open contact, the B terminal is a normally closed contact, the C terminal is a public end and is mainly connected with the input terminal and the public terminal of the PLC controller, if the A terminal can be connected with X001, when the frequency converter has a fault, the X001 is directly connected, so that the constant-temperature electric control system is converted into a power frequency working mode from a frequency conversion working mode; three lines are correspondingly connected between the R, S three-phase line connected with the T terminal of the frequency converter 4 and three lines between the variable-frequency heating contactor KM2 and the overload relay KH respectively, and the three lines are connected with three groups of normally open contacts of the power-frequency heating contactor KM1 respectively; the L terminal of the PLC 3 is connected with a phase line of a first power supply 1, the N terminal of the PLC is connected with a zero line and is used for obtaining a 220V alternating current power supply required by operation, the X000 input terminal and the X001 input terminal of the PLC are respectively connected with two fixed ends of a selector switch SA, when the selector switch SA is switched on with the X000 input terminal, the whole constant-temperature electric control system is in a normal operation mode of a frequency converter 4, when the selector switch is switched on with the X001 input terminal, the whole constant-temperature electric control system is in a fault or maintenance operation mode of the frequency converter 4, the X002, X003, X004, X005 and X006 input terminals of the PLC are respectively connected with a starting switch SB1, a stopping switch SB2, an auxiliary contact of an overload relay KH, a high-temperature normally closed contact T1 and a low-temperature normally open contact T2 which are arranged in the temperature control relay 5, and a 220V alternating current power supply COM 11 is connected between the other end of the starting switch SB1, the stopping switch SB2, the auxiliary contact of the overload relay KH, the high-temperature, the output terminals of Y010, Y011, Y012 and Y013 are respectively connected with the coil of a power frequency heating contactor KM1, the coil of a variable frequency heating contactor KM2, a heating indicator lamp LD1 and an alarm indicator lamp LD2, and a 220V alternating current power supply 11 is connected between the other ends of the coil of the power frequency heating contactor KM1, the coil of the variable frequency heating contactor KM2, the heating indicator lamp LD1 and the alarm indicator lamp LD2 and the COM2 terminal; the input terminal of the signal isolation distributor 6 is connected with the output terminal of the temperature control relay 5 through a line, one path of the output terminal is connected with an A/D input module of the PLC 3 through the line, and the other path is connected with the 4 terminal and the 5 terminal of the frequency converter 4; the thermocouple 10 is connected with an input terminal of the temperature control relay 5 through a circuit; the temperature control relay 5 is connected with a 220V alternating current power supply 11 through a line so as to obtain normal working voltage.

The present embodiment operates as follows:

1) when the selection switch SA selects 45 degrees at the left, namely the selection switch SA is connected with an X000 input terminal of the PLC controller 3, the constant-temperature electrical control system is in a normal operation mode of the frequency converter, a frequency converter operation instruction and a PID control instruction are output to the frequency converter 4 through the PLC controller 3, and an operation instruction is output to the frequency conversion heating contactor KM2, a coil of the frequency converter heating contactor KM2 is electrified, three groups of normally open contacts of the frequency converter heating contactor KM2 are attracted, frequency conversion voltage is output from a U, V terminal and a W output terminal of the frequency converter 4 to be supplied to the heater 9 for working, and the heating indicator lamp LD1 is lightened at the moment; meanwhile, a thermocouple 10 serving as a temperature sensor in an oil storage cabinet 7 collects a temperature rise analog quantity signal in real time and inputs the temperature rise analog quantity signal to a temperature control relay 5, the temperature control relay 5 outputs a 4-20 mA signal and inputs the signal to a signal isolation distributor 6, the isolation distributor 6 outputs a double-path 4-20 mA analog signal, one path is used for inputting an A \ D input module of a PLC 3, real-time monitoring of the temperature of the working oil is realized, the other path is input to a frequency converter 4, and constant-temperature PID closed-loop control of uninterrupted operation of a heater 9 is realized; when the frequency converter 4 is in fault shutdown, a fault signal is sent to the PLC controller 3 through A, B and a C fault output terminal of the frequency converter 4, the PLC controller 3 is directly connected with an X001 input terminal thereof in a program mode and outputs an automatic frequency converter cut-off operation instruction, a PID control instruction, a frequency conversion heating contactor KM2 stop operation instruction and the like, a coil of the frequency converter heating contactor KM2 is powered off, three groups of connected normally open contacts of the frequency converter heating contactor KM2 are disconnected and released, an alarm indicator LD2 is lightened, the PLC controller 3 outputs a power frequency heating operation instruction to the power frequency heating contactor KM1, the coil of the power frequency heating contactor KM1 is powered on, three groups of normally open contacts of the power frequency heating contactor KM1 are actuated, power frequency voltage is transmitted through a first power supply to the heater 9 to work, the heating indicator LD1 is lightened, and meanwhile, a temperature rise analog quantity signal is collected by a temperature sensor thermocouple 10 in the oil storage cabinet 7 in real time and is input to, when a temperature high signal normally-closed contact T1 arranged in the temperature control relay 5 reaches a set upper limit value, the temperature high signal normally-closed contact is disconnected and signals are transmitted to the PLC 3, the PLC 3 outputs a power frequency heating stop operation instruction, the coil of the power frequency heating frequency converter KM1 is controlled to lose power, then three groups of connected normally-open contacts of the power frequency heating contactor KM1 are disconnected and released, power frequency voltage is disconnected, and the heater 9 stops working; the temperature control relay 5 is connected when a built-in low-temperature signal normally-open contact T2 reaches a set lower limit value, the signal is transmitted to the PLC 3, the PLC 3 outputs a power frequency heating operation instruction again to control the power frequency heating contactor KM1 to suck again, and power frequency voltage is supplied to the heater 9 to work, so that the automatic cycle work is realized, and the uninterrupted control of the oil temperature is realized; when the fault of the frequency converter 4 is eliminated, the PLC controller is reconnected to the X000 input terminal and returns to the original frequency conversion heating mode.

2) When the selection switch SA selects 45 degrees at the right, namely the selection switch SA is connected with an X001 input terminal of the PLC controller 3, the system is in a frequency converter fault maintenance operation mode, when the start switch SB1 is pressed down during field operation, the PLC controller 3 outputs a power frequency heating operation instruction to a power frequency heating contactor KM1, a coil of the power frequency heating contactor KM1 is electrified, three groups of normally open contacts of the power frequency heating contactor KM1 are attracted, power frequency voltage is transmitted by a first power supply to supply the heater 9 to work, a heating indicator lamp LD1 is lightened, meanwhile, a temperature sensor thermocouple 10 in an oil storage cabinet 7 collects a temperature rise analog quantity signal in real time and inputs the temperature rise analog quantity signal to a temperature control relay 5, the temperature rise analog quantity signal is disconnected and transmitted to the PLC controller 3 when a temperature high signal normally closed contact T1 arranged in the temperature control relay 5 reaches a set upper limit value, the PLC controller 3 outputs a power frequency, controlling the coil of the power frequency heating frequency converter KM1 to lose power, and further disconnecting and releasing three groups of connected normally open contacts of the power frequency heating contactor KM1, disconnecting power frequency voltage and stopping the heater 9; the temperature control relay 5 is connected when a built-in low-temperature signal normally-open contact T2 reaches a set lower limit value, the signal is transmitted to the PLC 3, the PLC 3 outputs a power frequency heating operation instruction again to control the power frequency heating contactor KM1 to suck again, and power frequency voltage is supplied to the heater 9 to work, so that the automatic cycle work is realized, and the uninterrupted control of the oil temperature is realized; when the stop switch SB2 or the overload protection switch of the overload relay KH is pressed, the system stops operating.

In this embodiment, the starting end of the three phase lines L1, L2 and L3 of the first power supply 1 is further provided with an automatic switch QA1.

In this embodiment, a fuse FU is disposed on a line between the L terminal of the PLC controller 3 and a phase line of the first power supply 1.

In this embodiment, the 220V ac power supply 11 is composed of a phase line and a neutral line of the first power supply 1.

The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.

Claims

1. A constant-temperature electrical control system for dry oil lubrication of heavy-duty transmission equipment comprises an oil conservator (7), and is characterized by further comprising a first power supply (1), a second power supply (2), a PLC (programmable logic controller) controller (3), a power frequency heating contactor (KM1), a frequency converter (4), a temperature control relay (5), a signal isolation distributor (6), the oil conservator (7) and an external control unit (8); a heater (9) and a thermocouple (10) are arranged in the oil conservator (7); the power frequency heating contactor (KM1) and the frequency converter (4) are respectively connected with the heater (9) through a line, and the line between the frequency converter (4) and the heater (9) is provided with a frequency conversion heating contactor (KM 2); the first power supply (1) is respectively connected with the PLC (3), the power frequency heating contactor (KM1), the frequency converter (4), the temperature control relay (5) and the external control unit (8) through circuits; the second power supply (2) is connected with a signal isolation distributor (6) through a line; the power frequency heating contactor (KM1), the frequency converter (4), the frequency conversion heating contactor (KM2), the temperature control relay (5), the signal isolation distributor (6) and the external control unit (8) are respectively connected to the PLC controller (3) through circuits; the thermocouple (10) and the signal isolation distributor (6) are respectively connected with the temperature control relay (5) through a line, and the signal isolation distributor (6) is also connected with the frequency converter (4) through a line.

2. The dry oil lubrication constant temperature electric control system of the heavy-duty transmission equipment as claimed in claim 1, wherein the line connecting the line heating contactor (KM1) and the line heating contactor (KM2) with the heater (9) is further provided with an overload relay (KH), and the overload relay (KH) is connected to the PLC controller (3) through a line.

3. The dry oil lubrication constant temperature electric control system of the heavy-duty transmission equipment according to claim 1 or 2, characterized in that the first power supply (1) and the second power supply (2) are a three-phase 380V alternating current power supply and a 24V direct current power supply respectively.

4. A heavy duty transmission dry oil lubricated thermostatted electrical control system as claimed in claim 3, characterized in that said external control unit (8) comprises auxiliary contacts on the selector Switch (SA), the start switch (SB1), the stop switch (SB2) and the overload relay (KH).

5. The dry oil lubrication constant-temperature electric control system of the heavy-duty transmission equipment as claimed in claim 4, wherein the PLC controller (3) is further provided with a heating indicator lamp (LD1) and an alarm indicator lamp (LD2) through line connection.

6. The dry oil lubrication constant-temperature electric control system of the heavy-duty transmission equipment as claimed in claim 5, wherein the PLC controller (3) is a Mitsubishi FX2N system small-sized machine, the frequency converter (4) is a Mitsubishi FR-E700 series frequency converter, the temperature control relay (5) is a Schneider RGE48 series temperature control relay, the signal isolation distributor (6) is KYP-A420-2A420-D, and the start switch (SB1) and the stop switch (SB2) are respectively a normally open switch and a normally closed switch; the three phase lines of the first power supply (1) are respectively L1, L2 and L3; r, S and T terminals of the frequency converter (4) are respectively connected with three phase lines of L1, L2 and L3 of a first power supply (1), U, V and W output terminals of the frequency converter are respectively connected with the heater (9) through three lines, the three lines are respectively connected with three groups of normally open contacts of a variable frequency heating contactor (KM2) and three groups of main contacts of an overload relay (KH), an STF terminal, an RH terminal and an SD terminal of the frequency converter are respectively connected with Y000, Y001 and COM1 output terminals of the PLC (3), and a A, B and a C fault output terminal of the frequency converter are connected into the PLC (3); three lines are correspondingly connected between the R, S three-phase line connected with the T terminal of the frequency converter (4) and three lines between the variable-frequency heating contactor (KM2) and the overload relay (KH), and the three lines are respectively connected with three groups of normally open contacts of the power-frequency heating contactor (KM 1); the PLC controller (3) is characterized in that an L terminal is connected with a phase line of a first power supply (1), an N terminal is connected with a zero line, an X000 input terminal and an X001 input terminal are respectively connected with two immobile ends of a selector Switch (SA), X002, X003, X004, X005 and X006 input terminals are respectively connected with a starting switch (SB1), a stopping switch (SB2), an auxiliary contact of an overload relay (KH), a high-temperature normally closed contact (T1) and a low-temperature normally open contact (T2) which are arranged in a temperature control relay (5), a 220V alternating current power supply (11) is connected between the other ends of the selector Switch (SA), the starting switch (SB1), the stopping switch (SB2), the auxiliary contact of the overload relay (KH), the high-temperature normally closed contact (T1) and the low-temperature normally open contact (T2) and the COM terminal thereof, and Y010, Y011, Y012 and Y013 output terminals are respectively connected with a power frequency heating contactor (KM) 1) of a power supply (KM 29), A coil of the variable-frequency heating contactor (KM2), a heating indicator lamp (LD1) and an alarm indicator lamp (LD2) are connected, and a 220V alternating current power supply (11) is connected between the other ends of the coil of the power-frequency heating contactor (KM1), the coil of the variable-frequency heating contactor (KM2), the heating indicator lamp (LD1) and the alarm indicator lamp (LD2) and a COM2 terminal; an input terminal of the signal isolation distributor (6) is connected with an output terminal of the temperature control relay (5) through a line, one path of the output terminal of the signal isolation distributor is connected to an A/D input module of the PLC (3) through the line, and the other path of the output terminal of the signal isolation distributor is connected to a terminal 4 and a terminal 5 of the frequency converter (4); the thermocouple (10) is connected with an input terminal of the temperature control relay (5) through a circuit; the temperature control relay (5) is connected with a 220V alternating current power supply (11) through a line.

7. The dry oil lubrication thermostatic electric control system for heavy-duty transmission equipment according to claim 6, wherein the starting end of the three phase lines L1, L2 and L3 of the first power source (1) is further provided with an automatic switch (QA 1).

8. The dry oil lubrication thermostatic electric control system for heavy-duty transmission equipment according to claim 6, wherein a Fuse (FU) is provided on a line between the L terminal of the PLC controller (3) and a phase line of the first power supply (1).

9. The dry oil lubrication thermostatic electrical control system for heavy-duty transmission equipment according to claim 6, wherein said 220V AC power source (11) is composed of a phase line and a neutral line of the first power source (1).