CN112645218A - Electrical control loop of crane brake and control method thereof - Google Patents
Electrical control loop of crane brake and control method thereof Download PDFInfo
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- CN112645218A CN112645218A CN202011484233.5A CN202011484233A CN112645218A CN 112645218 A CN112645218 A CN 112645218A CN 202011484233 A CN202011484233 A CN 202011484233A CN 112645218 A CN112645218 A CN 112645218A
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000007246 mechanism Effects 0.000 claims abstract description 31
- 230000000630 rising effect Effects 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 4
- 230000001174 ascending effect Effects 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/18—Control systems or devices
- B66C13/22—Control systems or devices for electric drives
- B66C13/30—Circuits for braking, traversing, or slewing motors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/18—Control systems or devices
- B66C13/48—Automatic control of crane drives for producing a single or repeated working cycle; Programme control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C15/00—Safety gear
Abstract
The invention discloses an electrical control circuit of a crane brake and a control method thereof.A three-phase power in the control circuit is connected with a three-phase circuit breaker and then sequentially connected with a first contactor, a second contactor and two driving motors on two sets of parallel electric hydraulic brakes in series; the intermediate relay receives a control signal output by the PLC controller and then controls whether a coil of the contactor is electrified or not; the signal of the operating handle is transmitted to the PLC controller; the three-phase circuit breaker sends the state signal to the PLC; the first and second contactors transmit a signal indicating whether the contact is closed or not to the PLC controller; the opening limit signal on the electric hydraulic brake is transmitted to the PLC; the output end of the PLC controller outputs a control instruction to the intermediate relay to control whether the coil of the first contactor and the coil of the second contactor are electrified or not, so that whether a driving motor on the electric hydraulic brake is electrified or not is controlled, and the brake releasing or contracting of a motor of the hoisting mechanism or a motor of the amplitude transformer is realized. The invention has simple design, strong practicability and low cost.
Description
Technical Field
The invention relates to the field of crane safety electrical design, in particular to an electrical control loop of a crane brake and a control method thereof.
Background
The brake is an essential important component on crane equipment, and whether the brake can work normally directly influences the running accuracy and the working safety of each mechanism. The crane brake is mounted on the shaft of the motor for braking the operation of the motor so that its operation or the hoisting mechanism can be prepared for reliable stopping at a predetermined position. In particular, the brakes of the hoisting mechanism and the luffing mechanism must be absolutely reliable in braking performance, and the brakes of the hoisting mechanism and the luffing mechanism must be normally closed. At present, the electric design of a brake generally controls a driving motor on the brake to start or stop by the actuation or disconnection of a contactor contact, namely, the brake is powered on and switched off, and a brake is powered off. Because multiple protection designs are not adopted, once one contactor is damaged, the brake cannot work normally, and dangerous conditions occur.
In the prior art, a three-phase circuit breaker is generally arranged on a 380V power circuit of a crane brake, as shown in fig. 1, a three-phase contactor is arranged below the circuit breaker, a circuit at the lower end of the contactor is connected with a driving motor on the brake, and the contactor is controlled to be closed or opened through an intermediate relay so as to control the on-off of contacts of the contactor and further control the brake to work.
Disclosure of Invention
1. The technical problem to be solved is as follows:
aiming at the technical problem, the invention provides a safety control method for a crane brake, which adopts a multiple protection design and can improve the brake safety of the crane.
2. The technical scheme is as follows:
a hoist stopper electrical control circuit which characterized in that: the device comprises an operating handle, a handle data acquisition circuit, a three-phase circuit breaker, a contactor, a PLC (programmable logic controller), a first intermediate relay, a second intermediate relay, and driving motors and opening limiting devices on two sets of electric hydraulic brakes; the three-phase circuit breaker is connected with three-phase power and then sequentially connected with a first contactor, a second contactor and two driving motors on two sets of electric hydraulic brakes which are connected in parallel; the intermediate relay receives a control signal output by the PLC and issues a corresponding control signal to the contactor to control whether a coil of the contactor is electrified or not, specifically, the first intermediate relay controls whether the coil of the first contactor is electrified or not, and the second intermediate relay controls whether the coil of the second contactor is electrified or not; the signal acquisition circuit of the operating handle converts a state signal of the handle into an electric signal and transmits the electric signal to the input end of the PLC, and the state signal of the handle comprises an ascending signal or a descending signal or no signal; the three-phase circuit breaker converts a state signal indicating whether the circuit breaker is switched on into an electric signal and then sends the electric signal to the input end of the PLC; the first and second contactors convert the state signal of whether the contact of the contactor is closed or not into an electric signal and transmit the electric signal to the input end of the PLC; the opening limit on the electro-hydraulic brake is used for detecting whether the brake is in an opening state or not and transmitting an acquired opening limit signal to the input end of the PLC; the PLC controller comprises a PLC input end, a CPU and a PLC controller output end; the CPU receives the signals collected by the PLC input end, calculates and processes the received signals according to a preset program and sends control signals to the PLC output end; the output end of the PLC outputs a control instruction to a first intermediate relay and a second intermediate relay; the first intermediate relay and the second intermediate relay receive the control signal and correspondingly control whether the coil of the first contactor and the second contactor are electrified or not, so that whether a driving motor on the electric hydraulic brake is electrified or not is controlled, and brake release or brake holding of a motor of the hoisting mechanism or a motor of the amplitude transformer is realized.
Furthermore, the electro-hydraulic brake also comprises an electro-hydraulic pusher, a brake shoe, a brake spring assembly and a brake pull rod; and the electric hydraulic thruster pushes the brake shoe to brake the motor of the hoisting mechanism or the luffing mechanism by pushing the hydraulic motor.
A control method of an electric control loop of a crane brake is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: the operating handle signal acquisition circuit transmits a rising or falling signal or a no-action signal corresponding to the operating handle to the PLC; if the input end of the PLC detects that a rising or falling signal exists, the CPU issues a starting command to the frequency converter; the frequency converter controls a lifting motor or a variable amplitude motor to execute a corresponding command, and the motor rotates forwards or reversely; the frequency converter detects the running state of the motor and sends a running state signal to a CPU of the PLC; the running state of the motor comprises motor speed, current and torque; when the CPU receives a feedback signal of a starting command of a motor controlled by a frequency converter, immediately issuing a command to a first intermediate relay and a second intermediate relay; if the first and second intermediate relays receive a signal '1' representing the brake release of the PLC output module; the first intermediate relay and the second intermediate relay control a driving motor on the electric hydraulic brake to start, and the electric hydraulic brake is in an electrified brake release state; if the intermediate relay receives a signal '0' representing the band-type brake by the PLC output module, the first intermediate relay and the second intermediate relay control a driving motor on the electric hydraulic brake to stop acting, and the electric hydraulic brake is in a power-off band-type brake state.
Step two: if the first and second intermediate relays receive a signal '1' representing brake release by the PLC output module, namely the output end of the PLC controller issues a command for controlling the coils of the first and second contactors to be electrified, the contacts of the first and second contactors are closed, the electro-hydraulic brake is electrified and released, and the PLC controller detects a brake-opening limiting signal of the brake according to preset delay time; if the brake-opening limit signal of the brake is changed from a brake-holding state representing the brake to a brake-releasing state representing the brake to be 1, the PLC judges that the electric hydraulic brake is released at the moment and the brake is normally limited; if the brake-opening limit signal of the brake is still kept unchanged, which represents the state of brake band-type brake '0', the brake limit is indicated to be in fault, the PLC controller makes a fault alarm prompt through a cab fault display screen, simultaneously, the PLC controller automatically carries out safety protection, sends a stop signal to the frequency converter, and the brake band-type brake is used when the hoisting motor or the amplitude-varying motor is decelerated and stopped at zero speed, so that the hoisting mechanism or the amplitude-varying motor can not act until the fault is solved.
Step three: if the first and second intermediate relays receive the signal of the PLC output module and change the signal from representing brake release '1' to representing brake band-type brake '0', namely the output end of the PLC controller issues an instruction for controlling the automatic band-type brake of the first and second contactor coils to lose power, the first and second contactor contacts to be disconnected and the electric hydraulic brake to lose power; the PLC detects the brake-off limiting signal of the brake according to the preset delay time, and if the brake-off limiting signal of the brake changes from representing brake-off '1' to representing brake-in '0', the PLC judges that the electric hydraulic brake is in brake-in and the brake is normally limited; if the brake opening limit signal of the brake is still kept unchanged, which represents the brake release state of '1', the brake limit is in fault, the PLC controller makes a fault alarm prompt through a cab fault display screen, simultaneously, the PLC controller automatically performs safety protection, sends a stop signal to the frequency converter, and the brake is released when the hoisting motor or the amplitude transformer is decelerated and stopped at zero speed, so that the hoisting mechanism or the amplitude transformer cannot act until the fault is solved.
Step four: if the first and second intermediate relays receive a signal '1' representing brake release of the PLC output module, namely the output end of the PLC controller issues a command for controlling the coils of the first and second contactors to be electrified and the contacts of the first and second contactors to be closed; the PLC detects a state signal of the first contactor and the second contactor according to preset delay time; if the contactor state signals of the electric hydraulic brake are changed from representing that the contactor contacts are disconnected from '0' to representing that the contactor contacts are attracted by '1', the PLC judges that the two contactor contacts are attracted at the moment and the two contactors are in normal states; if the contactor state signal of only one brake is still kept unchanged, which represents that the contactor contact is disconnected from 0, the contactor is not attracted, the contactor has a fault, the PLC makes a fault alarm prompt through the cab fault display screen, and the PLC prompts that the contactor has a fault and the electro-hydraulic brake cannot be released.
Step five: if the first and second intermediate relays receive the signal of the output end of the PLC controller, the signal is changed from representing brake release '1' to representing brake internal contracting brake '0', namely the output end of the PLC controller issues the fingers for controlling the automatic internal contracting brake of the first and second contactor coils to lose power, the first and second contactor contacts to be disconnected and the electric hydraulic brake to lose power; the PLC detects the state signals of the first contactor and the second contactor according to the time preset by time delay, and if the state signals of the contactors of the electric hydraulic brake are changed from representing the pull-in of the contactor contact to '1' to representing the disconnection of the contactor contact to '0', the PLC judges that the two contactor contacts are disconnected at the moment and the two contactors are in normal states; if the contactor state signal of only one brake is kept unchanged, which represents the original state of contactor contact actuation '1', the contactor is not disconnected, the contactor breaks down, the PLC controller gives a fault alarm prompt through a cab fault display screen, meanwhile, the PLC controller automatically carries out safety protection, a stop signal is sent to the frequency converter, the lifting motor or the amplitude-variable motor is decelerated and stopped, the other normal contactor can be disconnected to control the safety brake of the electric hydraulic brake at zero speed, and the lifting mechanism or the amplitude-variable mechanism cannot act until the fault is solved.
3. Has the advantages that:
(1) according to the invention, the design of double contactors is adopted in the electric control loop of the brake, when one contactor fails, the hoisting mechanism or the amplitude transformer connected with the contactor can continue to work, so that the stability of the whole machine is greatly improved; and the signals of the two contactors can be detected in the using process, so that the safety of the contactor is greatly improved.
(2) The invention collects various state signals of the electric control loop of the brake through the PLC, participates in PLC programming control, and realizes multiple protection of the safe work of the brake.
In conclusion, the invention has simple design, strong practicability and low cost; the redundant design concept has wide applicability in other aspects with high requirements on safety; meanwhile, the safety and the stability of the brake on the crane are greatly improved.
Drawings
FIG. 1 is an electrical diagram of a prior art crane brake electrical control circuit;
FIG. 2 is an electrical diagram of the crane brake electrical control circuit of the present invention;
fig. 3 is a schematic structural diagram of the crane brake of the invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The electrical control circuit of the crane brake is characterized in that as shown in the attached drawings 2-3: the device comprises an operating handle, a handle data acquisition circuit, a three-phase circuit breaker, a contactor, a PLC (programmable logic controller), a first intermediate relay, a second intermediate relay, and driving motors and opening limiting devices on two sets of electric hydraulic brakes; the three-phase circuit breaker is connected with three-phase power and then sequentially connected with a first contactor, a second contactor and two driving motors on two sets of electric hydraulic brakes which are connected in parallel; the intermediate relay receives a control signal output by the PLC and issues a corresponding control signal to the contactor to control whether a coil of the contactor is electrified or not, specifically, the first intermediate relay controls whether the coil of the first contactor is electrified or not, and the second intermediate relay controls whether the coil of the second contactor is electrified or not; the signal acquisition circuit of the operating handle converts a state signal of the handle into an electric signal and transmits the electric signal to the input end of the PLC, and the state signal of the handle comprises an ascending signal or a descending signal or no signal; the three-phase circuit breaker converts a state signal indicating whether the circuit breaker is switched on into an electric signal and then sends the electric signal to the input end of the PLC; the first and second contactors convert the state signal of whether the contact of the contactor is closed or not into an electric signal and transmit the electric signal to the input end of the PLC; the opening limit on the electro-hydraulic brake is used for detecting whether the brake is in an opening state or not and transmitting an acquired opening limit signal to the input end of the PLC; the PLC controller comprises a PLC input end, a CPU and a PLC controller output end; the CPU receives the signals collected by the PLC input end, calculates and processes the received signals according to a preset program and sends control signals to the PLC output end; the output end of the PLC outputs a control instruction to a first intermediate relay and a second intermediate relay; the first intermediate relay and the second intermediate relay receive the control signal and correspondingly control whether the coil of the first contactor and the second contactor are electrified or not, so that whether a driving motor on the electric hydraulic brake is electrified or not is controlled, and brake release or brake holding of a motor of the hoisting mechanism or a motor of the amplitude transformer is realized.
Furthermore, the electro-hydraulic brake also comprises an electro-hydraulic pusher, a brake shoe, a brake spring assembly and a brake pull rod; and the electric hydraulic thruster pushes the brake shoe to brake the motor of the hoisting mechanism or the luffing mechanism by pushing the hydraulic motor.
A control method of an electric control loop of a crane brake is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: the operating handle signal acquisition circuit transmits a rising or falling signal or a no-action signal corresponding to the operating handle to the PLC; if the input end of the PLC detects that a rising or falling signal exists, the CPU issues a starting command to the frequency converter; the frequency converter controls a lifting motor or a variable amplitude motor to execute a corresponding command, and the motor rotates forwards or reversely; the frequency converter detects the running state of the motor and sends a running state signal to a CPU of the PLC; the running state of the motor comprises motor speed, current and torque; when the CPU receives a feedback signal of a starting command of a motor controlled by a frequency converter, immediately issuing a command to a first intermediate relay and a second intermediate relay; if the first and second intermediate relays receive a signal '1' representing the brake release of the PLC output module; the first intermediate relay and the second intermediate relay control a driving motor on the electric hydraulic brake to start, and the electric hydraulic brake is in an electrified brake release state; if the intermediate relay receives a signal '0' representing the band-type brake by the PLC output module, the first intermediate relay and the second intermediate relay control a driving motor on the electric hydraulic brake to stop acting, and the electric hydraulic brake is in a power-off band-type brake state.
Step two: if the first and second intermediate relays receive a signal '1' representing brake release by the PLC output module, namely the output end of the PLC controller issues a command for controlling the coils of the first and second contactors to be electrified, the contacts of the first and second contactors are closed, the electro-hydraulic brake is electrified and released, and the PLC controller detects a brake-opening limiting signal of the brake according to preset delay time; if the brake-opening limit signal of the brake is changed from a brake-holding state representing the brake to a brake-releasing state representing the brake to be 1, the PLC judges that the electric hydraulic brake is released at the moment and the brake is normally limited; if the brake-opening limit signal of the brake is still kept unchanged, which represents the state of brake band-type brake '0', the brake limit is indicated to be in fault, the PLC controller makes a fault alarm prompt through a cab fault display screen, simultaneously, the PLC controller automatically carries out safety protection, sends a stop signal to the frequency converter, and the brake band-type brake is used when the hoisting motor or the amplitude-varying motor is decelerated and stopped at zero speed, so that the hoisting mechanism or the amplitude-varying motor can not act until the fault is solved.
Step three: if the first and second intermediate relays receive the signal of the PLC output module and change the signal from representing brake release '1' to representing brake band-type brake '0', namely the output end of the PLC controller issues an instruction for controlling the automatic band-type brake of the first and second contactor coils to lose power, the first and second contactor contacts to be disconnected and the electric hydraulic brake to lose power; the PLC detects the brake-off limiting signal of the brake according to the preset delay time, and if the brake-off limiting signal of the brake changes from representing brake-off '1' to representing brake-in '0', the PLC judges that the electric hydraulic brake is in brake-in and the brake is normally limited; if the brake opening limit signal of the brake is still kept unchanged, which represents the brake release state of '1', the brake limit is in fault, the PLC controller makes a fault alarm prompt through a cab fault display screen, simultaneously, the PLC controller automatically performs safety protection, sends a stop signal to the frequency converter, and the brake is released when the hoisting motor or the amplitude transformer is decelerated and stopped at zero speed, so that the hoisting mechanism or the amplitude transformer cannot act until the fault is solved.
Step four: if the first and second intermediate relays receive a signal '1' representing brake release of the PLC output module, namely the output end of the PLC controller issues a command for controlling the coils of the first and second contactors to be electrified and the contacts of the first and second contactors to be closed; the PLC detects a state signal of the first contactor and the second contactor according to preset delay time; if the contactor state signals of the electric hydraulic brake are changed from representing that the contactor contacts are disconnected from '0' to representing that the contactor contacts are attracted by '1', the PLC judges that the two contactor contacts are attracted at the moment and the two contactors are in normal states; if the contactor state signal of only one brake is still kept unchanged, which represents that the contactor contact is disconnected from 0, the contactor is not attracted, the contactor has a fault, the PLC makes a fault alarm prompt through the cab fault display screen, and the PLC prompts that the contactor has a fault and the electro-hydraulic brake cannot be released.
Step five: if the first and second intermediate relays receive the signal of the output end of the PLC controller, the signal is changed from representing brake release '1' to representing brake internal contracting brake '0', namely the output end of the PLC controller issues the fingers for controlling the automatic internal contracting brake of the first and second contactor coils to lose power, the first and second contactor contacts to be disconnected and the electric hydraulic brake to lose power; the PLC detects the state signals of the first contactor and the second contactor according to the time preset by time delay, and if the state signals of the contactors of the electric hydraulic brake are changed from representing the pull-in of the contactor contact to '1' to representing the disconnection of the contactor contact to '0', the PLC judges that the two contactor contacts are disconnected at the moment and the two contactors are in normal states; if the contactor state signal of only one brake is kept unchanged, which represents the original state of contactor contact actuation '1', the contactor is not disconnected, the contactor breaks down, the PLC controller gives a fault alarm prompt through a cab fault display screen, meanwhile, the PLC controller automatically carries out safety protection, a stop signal is sent to the frequency converter, the lifting motor or the amplitude-variable motor is decelerated and stopped, the other normal contactor can be disconnected to control the safety brake of the electric hydraulic brake at zero speed, and the lifting mechanism or the amplitude-variable mechanism cannot act until the fault is solved.
The specific embodiment is as follows:
the invention realizes the multiple protection of the electrical control of the brake by the way of the electrical control loop on hardware and the PLC signal acquisition programming on software, connects a contactor in series in the electrical control loop of the original hardware brake, and outputs instructions to two intermediate relays through two output ends of the PLC controller to control the attraction or disconnection of two contactor contacts connected in series so as to control the work of a hydraulic push rod motor of the brake, thereby realizing the brake reporting or brake release of the brake of a hoisting mechanism or a luffing mechanism. Once one of the contactors or the PLC output intermediate relay is found to be out of order, an operator can be prompted on the cab fault display, meanwhile, the other contactor can guarantee the normal work of the brake, the control failure of the brake cannot be caused, and the working stability and the safety of the brake are greatly guaranteed.
As shown in fig. 2, in the power circuit of the AC380V three-phase power supply lifting brake, Q1 is a three-phase circuit breaker, which protects the driving motor of the electro-hydraulic brake and can automatically cut off the circuit when serious overload or short circuit or undervoltage occurs. Two contactors H1KMY1 and HIKMY2 are connected in series in a lower end power circuit of the circuit breaker, and the contact of the two contactors H1KMY1 and H1KMY2 are controlled to be attracted or disconnected through intermediate relays C12K4 and C12K5, so that the driving motor of the electro-hydraulic brake is controlled to be electrified or powered off.
As shown in the attached figure 3, an opening detection state limiting signal and a contactor state signal on the electric hydraulic brake enter a PLC input module, and multiple protection is implemented on the electric control of the brake through PLC programming.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (3)
1. A hoist stopper electrical control circuit which characterized in that: the device comprises an operating handle, a handle data acquisition circuit, a three-phase circuit breaker, a contactor, a PLC (programmable logic controller), a first intermediate relay, a second intermediate relay, and driving motors and opening limiting devices on two sets of electric hydraulic brakes; the three-phase circuit breaker is connected with three-phase power and then sequentially connected with a first contactor, a second contactor and two driving motors on two sets of electric hydraulic brakes which are connected in parallel; the intermediate relay receives a control signal output by the PLC and issues a corresponding control signal to the contactor to control whether a coil of the contactor is electrified or not, specifically, the first intermediate relay controls whether the coil of the first contactor is electrified or not, and the second intermediate relay controls whether the coil of the second contactor is electrified or not; the signal acquisition circuit of the operating handle converts a state signal of the handle into an electric signal and transmits the electric signal to the input end of the PLC, and the state signal of the handle comprises an ascending signal or a descending signal or no signal; the three-phase circuit breaker converts a state signal indicating whether the circuit breaker is switched on into an electric signal and then sends the electric signal to the input end of the PLC; the first and second contactors convert the state signal of whether the contact of the contactor is closed or not into an electric signal and transmit the electric signal to the input end of the PLC; the opening limit on the electro-hydraulic brake is used for detecting whether the brake is in an opening state or not and transmitting an acquired opening limit signal to the input end of the PLC; the PLC controller comprises a PLC input end, a CPU and a PLC controller output end; the CPU receives the signals collected by the PLC input end, calculates and processes the received signals according to a preset program and sends control signals to the PLC output end; the output end of the PLC outputs a control instruction to a first intermediate relay and a second intermediate relay; the first intermediate relay and the second intermediate relay receive the control signal and correspondingly control whether the coil of the first contactor and the second contactor are electrified or not, so that whether a driving motor on the electric hydraulic brake is electrified or not is controlled, and brake release or brake holding of a motor of the hoisting mechanism or a motor of the amplitude transformer is realized.
2. A crane brake electrical control circuit as claimed in claim 1, wherein: the electro-hydraulic brake also comprises an electro-hydraulic pusher, a brake shoe, a brake spring assembly and a brake pull rod; and the electric hydraulic thruster pushes the brake shoe to brake the motor of the hoisting mechanism or the luffing mechanism by pushing the hydraulic motor.
3. A control method of an electric control circuit of a crane brake for controlling a crane brake electric control circuit as claimed in any one of claims 1 to 2, characterized in that: the method comprises the following steps:
the method comprises the following steps: the operating handle signal acquisition circuit transmits a rising or falling signal or a no-action signal corresponding to the operating handle to the PLC; if the input end of the PLC detects that a rising or falling signal exists, the CPU issues a starting command to the frequency converter; the frequency converter controls a lifting motor or a variable amplitude motor to execute a corresponding command, and the motor rotates forwards or reversely; the frequency converter detects the running state of the motor and sends a running state signal to a CPU of the PLC; the running state of the motor comprises motor speed, current and torque; when the CPU receives a feedback signal of a starting command of a motor controlled by a frequency converter, immediately issuing a command to a first intermediate relay and a second intermediate relay; if the first and second intermediate relays receive a signal '1' representing the brake release of the PLC output module; the first intermediate relay and the second intermediate relay control a driving motor on the electric hydraulic brake to start, and the electric hydraulic brake is in an electrified brake release state; if the intermediate relay receives a signal '0' representing the band-type brake by the PLC output module, the first intermediate relay and the second intermediate relay control a driving motor on the electric hydraulic brake to stop acting, and the electric hydraulic brake is in a power-off band-type brake state;
step two: if the first and second intermediate relays receive a signal '1' representing brake release by the PLC output module, namely the output end of the PLC controller issues a command for controlling the coils of the first and second contactors to be electrified, the contacts of the first and second contactors are closed, the electro-hydraulic brake is electrified and released, and the PLC controller detects a brake-opening limiting signal of the brake according to preset delay time; if the brake-opening limit signal of the brake is changed from a brake-holding state representing the brake to a brake-releasing state representing the brake to be 1, the PLC judges that the electric hydraulic brake is released at the moment and the brake is normally limited; if the brake-opening limit signal of the brake is still kept unchanged, which represents the state of brake band-type brake 0, the brake limit is failed, the PLC controller gives a fault alarm prompt through a cab fault display screen, and simultaneously, the PLC controller automatically carries out safety protection, sends a stop signal to the frequency converter, and the brake band-type brake is stopped when a lifting motor or a variable-amplitude motor is decelerated and stopped at zero speed, so that the lifting mechanism or the variable-amplitude motor cannot act until the fault is solved;
step three: if the first and second intermediate relays receive the signal of the PLC output module and change the signal from representing brake release '1' to representing brake band-type brake '0', namely the output end of the PLC controller issues an instruction for controlling the automatic band-type brake of the first and second contactor coils to lose power, the first and second contactor contacts to be disconnected and the electric hydraulic brake to lose power; the PLC detects the brake-off limiting signal of the brake according to the preset delay time, and if the brake-off limiting signal of the brake changes from representing brake-off '1' to representing brake-in '0', the PLC judges that the electric hydraulic brake is in brake-in and the brake is normally limited; if the brake opening limit signal of the brake is still kept unchanged, which represents the brake release '1' state, the brake limit is in failure, the PLC controller gives a failure alarm prompt through a cab failure display screen, simultaneously, the PLC controller automatically carries out safety protection, sends a stop signal to the frequency converter, and the brake is released when the hoisting motor or the amplitude transformer is decelerated and stopped at zero speed, so that the hoisting mechanism or the amplitude transformer cannot act until the failure is solved;
step four: if the first and second intermediate relays receive a signal '1' representing brake release of the PLC output module, namely the output end of the PLC controller issues a command for controlling the coils of the first and second contactors to be electrified and the contacts of the first and second contactors to be closed; the PLC detects a state signal of the first contactor and the second contactor according to preset delay time; if the contactor state signals of the electric hydraulic brake are changed from representing that the contactor contacts are disconnected from '0' to representing that the contactor contacts are attracted by '1', the PLC judges that the two contactor contacts are attracted at the moment and the two contactors are in normal states; if the contactor state signal of only one brake is still kept unchanged, which represents that the contactor contact is disconnected by 0, the contactor is not attracted, the contactor has a fault, the PLC makes a fault alarm prompt through a cab fault display screen to prompt that the contactor has a fault and the electro-hydraulic brake cannot be released;
step five: if the first and second intermediate relays receive the signal of the output end of the PLC controller, the signal represents that the brake is released from '1' to '0' of the brake, namely the output end of the PLC controller issues the instructions for controlling the automatic brake-releasing of the first and second contactor coils, the disconnection of the first and second contactor contacts and the power-off of the electro-hydraulic brake; the PLC detects the state signals of the first contactor and the second contactor according to the time preset by time delay, and if the state signals of the contactors of the electric hydraulic brake are changed from representing the pull-in of the contactor contact to '1' to representing the disconnection of the contactor contact to '0', the PLC judges that the two contactor contacts are disconnected at the moment and the two contactors are in normal states; if the contactor state signal of only one brake is kept unchanged, which represents the original state of contactor contact actuation '1', the contactor is not disconnected, the contactor breaks down, the PLC controller gives a fault alarm prompt through a cab fault display screen, meanwhile, the PLC controller automatically carries out safety protection, a stop signal is sent to the frequency converter, the lifting motor or the amplitude-variable motor is decelerated and stopped, the other normal contactor can be disconnected to control the safety brake of the electric hydraulic brake at zero speed, and the lifting mechanism or the amplitude-variable mechanism cannot act until the fault is solved.
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| CN114460896A (en) * | 2022-01-11 | 2022-05-10 | 首钢京唐钢铁联合有限责任公司 | Lifting control device and method for steelmaking desulfurization stirring head |
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| CN112645218B (en) | 2024-02-06 |
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