CN114625042B - Bridge crane direct control system - Google Patents
Bridge crane direct control system Download PDFInfo
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- CN114625042B CN114625042B CN202210178280.XA CN202210178280A CN114625042B CN 114625042 B CN114625042 B CN 114625042B CN 202210178280 A CN202210178280 A CN 202210178280A CN 114625042 B CN114625042 B CN 114625042B
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- 238000001514 detection method Methods 0.000 claims abstract description 36
- 230000001012 protector Effects 0.000 claims abstract description 25
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- 239000003990 capacitor Substances 0.000 claims description 63
- 230000003321 amplification Effects 0.000 abstract description 12
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 12
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- 238000000034 method Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000012163 sequencing technique Methods 0.000 description 2
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/21—Pc I-O input output
- G05B2219/21014—Interface, module with relays
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Abstract
The invention discloses a bridge crane direct control system which comprises a single chip microcomputer, a protector, a main stop relay, a phase sequence detection module and a limiting module, wherein the single chip microcomputer is respectively connected with the protector, the main stop relay, the phase sequence detection module and the limiting module. The technical scheme utilizes the integrated circuit technology, combines the signal receiving module with the control equipment through a circuit structure to optimize the structural design of the existing transmitter-receiver-control equipment, forms the structure of the transmitter-control equipment, improves the safety guarantee function, and forms a protection system by the signal acquisition circuit, the signal amplification rectifying and filtering comparison circuit and the singlechip processing unit, so that the fault detection and overload detection of the crane are realized, and the operation safety of the crane is ensured.
Description
Technical Field
The invention relates to the technical field of cranes, in particular to a bridge crane direct control system.
Background
In large-scale industrial production, travelling crane is a large-scale device essential to the production process. The existing travelling crane mainly comprises a control box, a vehicle body, guide rails and a lifting appliance, the operation process is realized by an operation handle connected with the vehicle body, a control instruction is sent out through the operation handle, and the control box is used for controlling the closing of all electric appliances, so that the travelling crane is ensured to complete various actions under the control of effective instructions. The travelling crane is used for carrying, moving and hoisting various workpieces, and the travelling crane belongs to a high-risk process, so that the safety and stability requirements in the use of the travelling crane are high. However, the existing center of the travelling crane, namely the control box, is only provided with a set of control circuit and control device, all control processes of the control circuit and the control device are completed independently, and in the long-time use process, various contactors in the control box frequently act, and the surfaces of the contactors are aged and damaged, so that the contactors can be insensitive to contact, the operation is easy to be unsmooth in the use process, and even the contactors can not be separated, so that the accident danger is caused.
The prior proposal mainly adopts a manual wiring technology to manufacture the control equipment, and adopts a mode of matching a transmitter and a receiver equipment to form a signal transmission structure of 'transmitter-receiver-terminal equipment', so that the transmitter equipment can transmit signals to the terminal equipment through the receiver to achieve the effect of controlling the terminal equipment by the transmitter equipment.
Chinese patent document CN201525700U discloses a "driving control box". The control device comprises a box body, a set of control components and a set of auxiliary control components, a distributor and a control switch, wherein the set of control components and the auxiliary control components are arranged in the box body, are mutually connected in parallel through the distributor, and are communicated with an external circuit through the control switch. The technical scheme lacks protection to the crane of the crane, and is difficult to ensure safe operation of the crane.
Disclosure of Invention
The invention mainly solves the technical problems of complex circuit and lack of safety protection in the prior technical scheme, and provides a bridge crane direct control system.
The technical problems of the invention are mainly solved by the following technical proposal: the invention comprises a singlechip, a protector, a relay, a phase sequence detection module and a limit module, wherein the singlechip is respectively connected with the protector, the main stop relay, the phase sequence detection module and the limit module. The single chip microcomputer realizes crane control and signal acquisition processing, the protection system of the protector consists of a signal acquisition circuit, a signal amplification rectifying and filtering comparison circuit and a single chip microcomputer processing unit, monitoring of the crane overload process is realized through phase failure detection and overload detection, the relay is used for starting and functional control of the crane, and the phase sequence detection module is mainly used for preventing the crane overrun caused by operation delay by detecting whether a line connected to the phase has sequencing errors or not.
Preferably, the singlechip comprises a chip U2, a pin 2 of the chip U2 is connected with a power end through a resistor R6, a pin 5 is grounded through a diode and the resistor R7 in sequence, a pin 6 is grounded, a pin 7 and a pin 8 are connected with the power end and are grounded through a capacitor C15, a pin 10 is connected with the power end, a pin 12 is grounded, a pin 13 is connected with a pin 7 of JP1, a pin 1 of JP1 is grounded, a pin 8 is connected with the power end, a pin 6 is connected with a pin 14 of the chip U2, a pin 15 of the chip U2 is grounded through a resistor NC2, a pin 16 is grounded through a resistor NC1, a pin 17 is connected with a pin 12 of the chip U1 through a resistor R8, a pin 18 of the chip U2 is connected with a pin 11 of the chip U1 through a resistor R9, a pin 19 of the chip U2 is connected with a pin 10 of the chip U1 through a resistor R10, a pin 20 of the chip U2 is connected with a pin 9 of the chip U1 through a resistor R11, pin 21 of chip U2 links to each other with chip U1's pin 8 through resistance R12, chip U1's pin R8 is grounded through electric capacity C5, chip U1's pin 1 is grounded through electric capacity C2 in proper order through inductance L5, inductance L2, electric capacity C1 is grounded through inductance L4 in proper order, electric capacity C31 is grounded through inductance L2, inductance L3 in proper order through electric capacity C31 is grounded through inductance L2, inductance L1 links to each other with the TY end, inductance L2 is connected through diode TVS1 with TY end when electric capacity C1 is grounded, pin 4 is connected with the power end when electric capacity C4 is grounded, pin 5 is connected with pin 6 in parallel, pin 7 is connected with the power end through diode TVS2 when electric capacity C6 and electric capacity C7 are connected in parallel, pin 13 is grounded through electric capacity C10, pin 14 is grounded through electric capacity C9. The singlechip is used for realizing signal conversion and processing, and timely sending out corresponding instructions to realize the protection of the crane system when the acquired signals are in a problem.
Preferably, the protector comprises a chip U1, wherein a pin 1, a pin 3, a pin 5 and a pin 6 of the U1 are connected with the singlechip, a pin 2 is connected with a power supply end, a pin 4 is grounded and is connected with the power supply end through a capacitor C1, and a pin 7 is connected with an output pin of an operational amplifier U4A; the output pin of the operational amplifier U4A is connected with the power end through a resistor R43 and is grounded through a capacitor C20, the negative input pin is grounded through a resistor R41 and a capacitor C17 which are connected in parallel, the positive input pin is connected with the output pin of the operational amplifier U4B through a diode D5 cathode and a resistor R39 in sequence, the positive input pin of the operational amplifier U4A is grounded through a capacitor C13 and a resistor R40 which are connected in parallel, the positive power pin is connected with the power end and is grounded through a capacitor C31, and is connected with the positive input pin through a resistor R42, and the negative power pin is grounded; the negative input pin of the operational amplifier U4B is connected with the resistor R37 and is connected with the output pin through the capacitor C27 and the resistor R38 which are connected in parallel, and the positive input pin is connected with the resistor R35; the negative input pin of the operational amplifier U4C is connected with the resistor R33 and is connected with the output pin through the capacitor C26 and the resistor R34 which are connected in parallel, the positive input pin is connected with the resistor R32, and the output pin is connected with the positive input pin of the operational amplifier U4A through the resistor R39 and the diode D5 in sequence; the negative input pin of the operational amplifier U4D is connected with the resistor R28 and is connected with the output pin through the capacitor C25 and the resistor R29 which are connected in parallel, the positive input pin is connected with the resistor R27, and the output pin is connected with the positive input pin of the operational amplifier U4A through the resistor R30 and the diode D4 in sequence.
The protection system consists of a signal acquisition circuit, a signal amplification rectifying and filtering comparison circuit and a singlechip processing unit. The three-phase signal of each phase is obtained by a current transformer, the current signal of the current transformer is converted into a small voltage signal through a small resistance resistor, and the voltage
The signal is sent to an inverting amplifying circuit formed by an operational amplifier for amplification. Each phase has 2 inverting amplifier circuits for the open-phase detection and overload detection circuits, respectively.
And (3) phase failure detection: after the signals of each phase amplified by the phase inversion are rectified and filtered by the diode, the power voltage comparator circuit compares the signals with the set reference voltage, if the signals are lower than the reference voltage, the comparator outputs low level, and if the load current is normal
A high level is output. The three-phase comparison voltage output signals are respectively sent to the single chip microcomputer, the single chip microcomputer detects three-phase open-phase signals at all times, and once the single chip microcomputer finds any phase open-phase, a shutdown signal and an open-phase alarm indication signal are sent out.
Overload detection: the signals of each phase after inverting amplification are rectified by a diode and then are overlapped together and filtered to obtain the total load voltage value, the voltage value is sent to a voltage comparator composed of operational amplifiers and is compared with the reference voltage set by the operational amplifiers, if
If the reference value is exceeded, the comparator sends out high level to indicate overload, otherwise, low level is sent out to indicate normal load, the three-phase total load comparison voltage output signal is sent to the single chip microcomputer, the single chip microcomputer detects the overload signal at all times, and once the single chip microcomputer finds that overload exists
Any overload signal, a stop signal and an overload alarm indication signal are sent out.
All operational amplifiers as signal amplification operate at 12V power supply with their quiescent operating point set to a 6V midpoint voltage provided by a voltage follower circuit consisting of 1 operational amplifier to the non-inverting terminal of the operational amplifier.
Preferably, the protector further comprises an operational amplifier U2B, wherein the negative input pin of the operational amplifier U2B is connected with the resistor R4 and is connected with the output pin through the capacitor C4 and the resistor R3 which are connected in parallel, the positive input pin is connected with the resistor R5, the output pin is sequentially connected with the positive input pin of the operational amplifier U3B through the resistor R6 and the diode D7, the positive input pin of the operational amplifier U3B is grounded through the diode C7 and the resistor R23 which are connected in parallel, the negative input pin is connected with the power end through the resistor R25 while being grounded through the diode C10 and the resistor R24 which are connected in parallel, and the output end is connected with the power end through the resistor R26 while being grounded through the capacitor C21.
Preferably, the protector further comprises an operational amplifier U2C, wherein the negative input pin of the operational amplifier U2C is connected with the resistor R8 and is connected with the output pin through the capacitor C5 and the resistor R7 which are connected in parallel, the positive input pin is connected with the resistor R9, the output pin is sequentially connected with the positive input pin of the operational amplifier U3C through the resistor R10 and the diode D8, the positive input pin of the operational amplifier U3C is grounded through the diode C8 and the resistor R22 which are connected in parallel, the negative input pin is connected with the power end through the resistor R20 while being grounded through the diode C11 and the resistor R21 which are connected in parallel, and the output end is connected with the power end through the resistor R19 while being grounded through the capacitor C22.
Preferably, the protector further comprises an operational amplifier U2D, wherein a negative input pin of the operational amplifier U2D is connected with the resistor R12 and is connected with an output pin through a capacitor C6 and a resistor R11 which are connected in parallel, a positive input pin is connected with the resistor R13, the output pin is sequentially connected with a positive input pin of the operational amplifier U3D through a resistor R14 and a diode D9, the positive input pin of the operational amplifier U3D is grounded through the diode C9 and the resistor R15 which are connected in parallel, a negative input pin is connected with a power end through a resistor R17 while being grounded through the diode C12 and the resistor R16 which are connected in parallel, and an output end is connected with the power end through a resistor R18 while being grounded through a capacitor C23.
Preferably, the relays include a total stop relay and a function control relay, the total stop relay includes K1, K2 and K3, the three phases are conducted to A, B, C three phases through triodes, the three phases are electrified along with a total stop relay switch, the function control relay includes K4, K5, K6 and K7, the function control is completed by the K4, K5, K6 and K7 relays controlled by A, B two phases, and the positive rotation and the negative rotation of the K4, K5, K6 and K7 control motors are respectively defined. Generally, the numbers of K4 and K5 are defined to control the forward rotation of the motor, and the numbers of K6 and K7 are defined to control the reverse rotation. When the K4-K7 relay with the control function has a problem, the master stop relay can be powered off for investigation. When the transmitter button is pressed, the receiver converts the electric signal into a machine signal which can be identified by the receiver circuit through the singlechip circuit structure, and then the functional structure is driven to operate.
Preferably, the phase sequence detection module circuit comprises a chip U5A and a chip U5B, a pin 1 of the chip U5A is connected with a pin 9 of the chip U5B, a pin 3 of the chip U5A is connected with an output end of a resistor R20 while a pin 4 of the chip U5A is connected with a pin 10 of the chip U5B, a pin 5 of the chip U5A is connected with a power end, a pin 6 of the chip U5A is grounded, a pin 8 of the chip U5B is grounded, a pin 11 of the chip U5B is connected with an output end of the U6A, a pin 13 of the chip U5B is respectively connected with an anode end of a diode D5 and a cathode end of the diode D6 through a capacitor C38, the cathode end of the diode D5 is connected with an input end of the U6F while the diode D5 is grounded through a capacitor C19 and a resistor R21 which are connected in parallel, the output end of the U6F is sequentially connected with the input end of the U6E, the resistor R22 and the diode ground, U6C input links to each other with the pin 4 of GO1 through resistance R18 in proper order, resistance R17 links to each other with the pin 4 of GO2, simultaneously resistance R18 in proper order, resistance R16 links to each other with the pin 4 of GO3, the pin 1 of GO1 links to each other with resistance R13, pin 2 links to each other with pin 1 through diode D11, pin 3 links to each other with the pin 3 of GO2, the pin 3 of GO3 links to each other and ground, the input of U6B links to each other with the pin 4 of GO2, the pin 1 of GO2 links to each other with resistance R14, the pin 2 of GO2 links to each other with the pin 1 of GO2 through diode D10, the output of U6A links to each other with the power supply through resistance R16 when linking to each other with the pin 4 of GO3, and through series capacitor C35, capacitor C36 ground, the pin 1 of GO3 links to each other with resistance R15, pin 2 links to each other with pin 1 through diode D9. The phase sequence detection module mainly detects whether the lines connected to the phases have errors in sequence, if yes, the phase sequence detection module releases the signals, and if yes, the emergency power-off processing is carried out; the open-phase protection system detects whether the equipment runs in a phase-missing mode in the running process of the equipment under the condition of detecting the phase sequence without error, if so, the power supply is disconnected within the minimum delay of the phase-missing mode, and the equipment is protected; if not, starting the next round of detection until the fault is detected, wherein the fault has no obvious influence on the normal operation of the equipment. The above power down situation can be restarted after the fault is removed.
The beneficial effects of the invention are as follows: the integrated circuit technology is utilized, the signal receiving module is combined with the control equipment through a circuit structure, so that the structural design of the existing transmitter-receiver-control equipment is optimized, the transmitter-control equipment structure is formed, the safety guarantee function is improved, a protection system is formed by the signal acquisition circuit, the signal amplification rectifying and filtering comparison circuit and the singlechip processing unit, the fault detection and overload detection of the crane are realized, and the operation safety of the crane is ensured.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Fig. 2 is a circuit diagram of a single chip microcomputer according to the present invention.
Fig. 3 is a circuit diagram of a protector of the present invention.
Fig. 4 is a circuit diagram of a total stop relay of the present invention.
Fig. 5 is a circuit diagram of a phase sequence checking module according to the present invention.
Fig. 6 is a circuit diagram of a limit module according to the present invention.
Detailed Description
The technical scheme of the invention is further specifically described below through examples and with reference to the accompanying drawings.
Examples: the bridge crane direct control system of the embodiment, as shown in fig. 1, comprises a single chip microcomputer, a protector, a relay, a phase sequence detection module and a limiting module, wherein the single chip microcomputer is respectively connected with the protector, the main stop relay, the phase sequence detection module and the limiting module. The single chip microcomputer realizes crane control and signal acquisition processing, the protection system of the protector consists of a signal acquisition circuit, a signal amplification rectifying and filtering comparison circuit and a single chip microcomputer processing unit, monitoring of the crane overload process is realized through phase failure detection and overload detection, the relay is used for starting and functional control of the crane, and the phase sequence detection module is mainly used for preventing the crane overrun caused by operation delay by detecting whether a line connected to the phase has sequencing errors or not.
As shown in FIG. 2, the singlechip comprises a chip U2, a pin 2 of the chip U2 is connected with a power end through a resistor R6, a pin 5 is grounded through a diode and the resistor R7 in sequence, a pin 6 is grounded, a pin 7 and a pin 8 are connected with the power end and are grounded through a capacitor C15, a pin 10 is connected with the power end, a pin 12 is grounded, a pin 13 is connected with a pin 7 of JP1, a pin 1 of JP1 is grounded, a pin 8 is connected with the power end, a pin 6 is connected with a pin 14 of the chip U2, a pin 15 of the chip U2 is grounded through a resistor NC2, a pin 16 is grounded through a resistor NC1, a pin 17 is connected with a pin 12 of the chip U1 through a resistor R8, a pin 18 of the chip U2 is connected with a pin 11 of the chip U1 through a resistor R9, a pin 19 of the chip U2 is connected with a pin 10 of the chip U1 through a resistor R11, a pin 20 of the chip U2 is connected with a pin 9 of the chip U1 through a resistor R11, pin 21 of chip U2 links to each other with chip U1's pin 8 through resistance R12, chip U1's pin R8 is grounded through electric capacity C5, chip U1's pin 1 is grounded through electric capacity C2 in proper order through inductance L5, inductance L2, electric capacity C1 is grounded through inductance L4 in proper order, electric capacity C31 is grounded through inductance L2, inductance L3 in proper order through electric capacity C31 is grounded through inductance L2, inductance L1 links to each other with the TY end, inductance L2 is connected through diode TVS1 with TY end when electric capacity C1 is grounded, pin 4 is connected with the power end when electric capacity C4 is grounded, pin 5 is connected with pin 6 in parallel, pin 7 is connected with the power end through diode TVS2 when electric capacity C6 and electric capacity C7 are connected in parallel, pin 13 is grounded through electric capacity C10, pin 14 is grounded through electric capacity C9. The singlechip is used for realizing signal conversion and processing, and timely sending out corresponding instructions to realize the protection of the crane system when the acquired signals are in a problem.
As shown in fig. 3, the protector comprises a chip U1, wherein a pin 1, a pin 3, a pin 5 and a pin 6 of the U1 are connected with the singlechip, a pin 2 is connected with a power supply end, a pin 4 is grounded and is connected with the power supply end through a capacitor C1, and a pin 7 is connected with an output pin of an operational amplifier U4A; the output pin of the operational amplifier U4A is connected with the power end through a resistor R43 and is grounded through a capacitor C20, the negative input pin is grounded through a resistor R41 and a capacitor C17 which are connected in parallel, the positive input pin is connected with the output pin of the operational amplifier U4B through a diode D5 cathode and a resistor R39 in sequence, the positive input pin of the operational amplifier U4A is grounded through a capacitor C13 and a resistor R40 which are connected in parallel, the positive power pin is connected with the power end and is grounded through a capacitor C31, and is connected with the positive input pin through a resistor R42, and the negative power pin is grounded; the negative input pin of the operational amplifier U4B is connected with the resistor R37 and is connected with the output pin through the capacitor C27 and the resistor R38 which are connected in parallel, and the positive input pin is connected with the resistor R35; the negative input pin of the operational amplifier U4C is connected with the resistor R33 and is connected with the output pin through the capacitor C26 and the resistor R34 which are connected in parallel, the positive input pin is connected with the resistor R32, and the output pin is connected with the positive input pin of the operational amplifier U4A through the resistor R39 and the diode D5 in sequence; the negative input pin of the operational amplifier U4D is connected with the resistor R28 and is connected with the output pin through the capacitor C25 and the resistor R29 which are connected in parallel, the positive input pin is connected with the resistor R27, and the output pin is connected with the positive input pin of the operational amplifier U4A through the resistor R30 and the diode D4 in sequence.
The protector further comprises an operational amplifier U2B, wherein the negative input pin of the operational amplifier U2B is connected with the resistor R4 and is connected with the output pin through the capacitor C4 and the resistor R3 which are connected in parallel, the positive input pin is connected with the resistor R5, the output pin is sequentially connected with the positive input pin of the operational amplifier U3B through the resistor R6 and the diode D7, the positive input pin of the operational amplifier U3B is grounded through the diode C7 and the resistor R23 which are connected in parallel, the negative input pin is connected with the power end through the resistor R25 while being grounded through the diode C10 and the resistor R24 which are connected in parallel, and the output end is connected with the power end through the resistor R26 while being grounded through the capacitor C21.
The protector further comprises an operational amplifier U2C, wherein the negative input pin of the operational amplifier U2C is connected with the resistor R8 and is connected with the output pin through the capacitor C5 and the resistor R7 which are connected in parallel, the positive input pin is connected with the resistor R9, the output pin is sequentially connected with the positive input pin of the operational amplifier U3C through the resistor R10 and the diode D8, the positive input pin of the operational amplifier U3C is grounded through the diode C8 and the resistor R22 which are connected in parallel, the negative input pin is connected with the power end through the resistor R20 while being grounded through the diode C11 and the resistor R21 which are connected in parallel, and the output end is connected with the power end through the resistor R19 while being grounded through the capacitor C22.
The protector further comprises an operational amplifier U2D, wherein the negative input pin of the operational amplifier U2D is connected with the resistor R12 and is connected with the output pin through the capacitor C6 and the resistor R11 which are connected in parallel, the positive input pin is connected with the resistor R13, the output pin is sequentially connected with the positive input pin of the operational amplifier U3D through the resistor R14 and the diode D9, the positive input pin of the operational amplifier U3D is grounded through the diode C9 and the resistor R15 which are connected in parallel, the negative input pin is connected with the power end through the resistor R17 while being grounded through the diode C12 and the resistor R16 which are connected in parallel, and the output end is connected with the power end through the resistor R18 while being grounded through the capacitor C23.
As shown in fig. 4, the relays include a total stop relay including K1, K2, K3, which is conducted to A, B, C three phases via triodes, which are all energized with the total stop relay switch, and a function control relay including K4, K5, K6, K7, the function control being completed by A, B two-phase controlled K4, K5, K6, K7 relays, respectively defining positive and negative rotations of the K4, K5, K6, K7 control motors.
The working principle diagrams of the total stop relays (K1, K2 and K3) and the function control relays (K4, K5, K6 and K7) are that the power is supplied from the upper left part of the diagram, three phases are conducted to A, B, C through triodes, the three phases are all supplied with power along with a switch of the total stop relay, the function control is mainly completed by the K4, K5, K6 and K7 relays controlled by A, B two phases, the positive rotation of a motor is controlled by the number of the K4 and K5, and the reverse rotation is controlled by the K6 and K7. When the K4-K7 relay with the control function has a problem, the master stop relay can be powered off for investigation. When the transmitter button is pressed, the receiver converts the electric signal into a machine signal which can be identified by the receiver circuit through the singlechip circuit structure shown in fig. 1, and then drives the functional structure to operate.
As shown in fig. 5, the phase-sequence detection module circuit includes chip U5A and chip U5B, chip U5A's pin 1 links to each other with chip U5B pin 9, chip U5A's pin 3 links to each other with the output of U6C, chip U5A's pin 4 links to each other with chip U5B pin 10 through resistance R20 ground while, chip U5A's pin 5 links to each other with the power supply end, chip U5A's pin 6 ground, chip U5B pin 8 ground, chip U5B pin 11 links to each other with U6A's output, chip U5B pin 13 links to each other with diode D5 anode terminal and diode D6 cathode terminal respectively through capacitor C38, diode D5 cathode terminal links to each other with U6F input through parallel capacitor C19 and resistor R21 ground while, U6F input terminal is grounded, U6C input terminal is through resistor R22 and diode ground, while pin 4 of U6C input terminal and 1 links to each other with resistor R18, R2 and R3 are connected with the output terminal 3 through resistor R3, the same pin 3 through resistor R3 and the 3 through resistor R3, the same pin 3 is connected with the output terminal of 3 through resistor 3 and the resistor 2 through the resistor 3, the GO2 is connected with the output of 3 through resistor 3 and the 3 through the resistor 3, the GO2 is connected with the 3 through resistor 3 and the 3 through the 3 of the 3 and the 3 is connected with the 3 through the 3 and the 3 through resistor 3, the 3 is connected with the 3 through the 3 and the 3 through the 3. As shown in fig. 6, the limit module is used for preventing the operation lag from causing the overrun of the crane.
The phase sequence detection module mainly detects whether the lines connected to the phases have errors in sequence, if yes, the phase sequence detection module releases the signals, and if yes, the emergency power-off processing is carried out; the open-phase protection system detects whether the equipment runs in a phase-missing mode in the running process of the equipment under the condition of detecting the phase sequence without error, if so, the power supply is disconnected within the minimum delay of the phase-missing mode, and the equipment is protected; if not, starting the next round of detection until the fault is detected, wherein the fault has no obvious influence on the normal operation of the equipment. The above power down situation can be restarted after the fault is removed.
The protection system formed by the protector consists of a signal acquisition circuit, a signal amplification rectifying and filtering comparison circuit and a singlechip processing unit. The three-phase signal of each phase is obtained by a current transformer, the current signal of the current transformer is converted into a small voltage signal through a small resistance resistor, and the voltage
The signal is sent to an inverting amplifying circuit formed by an operational amplifier for amplification. Each phase has 2 inverting amplifier circuits for the open-phase detection and overload detection circuits, respectively.
And (3) phase failure detection: after the signals of each phase amplified by the phase inversion are rectified and filtered by the diode, the power voltage comparator circuit compares the signals with the set reference voltage, if the signals are lower than the reference voltage, the comparator outputs low level, and if the load current is normal
A high level is output. The three-phase comparison voltage output signals are respectively sent to the single chip microcomputer, the single chip microcomputer detects three-phase open-phase signals at all times, and once the single chip microcomputer finds any phase open-phase, a shutdown signal and an open-phase alarm indication signal are sent out.
Overload detection: the signals of each phase after inverting amplification are rectified by a diode and then are overlapped together and filtered to obtain the total load voltage value, the voltage value is sent to a voltage comparator composed of operational amplifiers and is compared with the reference voltage set by the operational amplifiers, if
If the reference value is exceeded, the comparator sends out high level to indicate overload, otherwise, low level to indicate normal load, the three-phase total load comparison voltage output signal is sent to the single-chip microcomputer, the single-chip microcomputer detects the overload signal at all times, and once the single-chip microcomputer finds any overload signal, a stop signal and an overload alarm indication signal are sent out.
All operational amplifiers as signal amplification operate at 12V power supply with their quiescent operating point set to a 6V midpoint voltage provided by a voltage follower circuit consisting of 1 operational amplifier to the non-inverting terminal of the operational amplifier.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Although terms of protector, relay, phase sequence detection module, etc. are used more herein, the possibility of using other terms is not precluded. These terms are used merely for convenience in describing and explaining the nature of the invention; they are to be interpreted as any additional limitation that is not inconsistent with the spirit of the present invention.
Claims (5)
1. A bridge crane direct control system is characterized by comprising a single chip microcomputer, a protector, a relay, a phase sequence detection module and a limit module, wherein the single chip microcomputer is respectively connected with the protector, a total stop relay, the phase sequence detection module and the limit module, the single chip microcomputer comprises a chip U2, a pin 2 of the chip U2 is connected with a power end through a resistor R6, a pin 5 is grounded through a diode and a resistor R7 in sequence, the pin 6 is grounded, the pin 7 and the pin 8 are connected with the power end and are grounded through a capacitor C15, a pin 10 is connected with the power end, a pin 12 is grounded, a pin 13 is connected with a pin 7 of JP1, a pin 1 of JP1 is grounded, a pin 8 is connected with the power end, a pin 6 is connected with a pin 14 of the chip U2, a pin 15 of the chip U2 is grounded through a resistor NC2, a pin 16 is grounded through a resistor NC1, a pin 17 is connected with a pin 12 of the chip U1 through a resistor R8, pin 18 of chip U2 is connected with pin 11 of chip U1 through resistor R9, pin 19 of chip U2 is connected with pin 10 of chip U1 through resistor R10, pin 20 of chip U2 is connected with pin 9 of chip U1 through resistor R11, pin 21 of chip U2 is connected with pin 8 of chip U1 through resistor R12, pin R8 of chip U1 is grounded through capacitor C5, pin 1 of chip U1 is grounded through inductor L5 while sequentially through capacitor C2, inductor L2 and capacitor C1, inductor L5 is sequentially grounded through inductor L4 and capacitor C31, pin 2 is sequentially grounded through inductor L3, inductor L2 and TY while being grounded through capacitor C31, inductor L2 is connected with TVS1 while being grounded through diode while being grounded through capacitor C4 is connected with power supply terminal, pin 5 is connected with pin 6 in parallel, the pin 7 is connected with a power end through a diode TVS2 while being grounded through a capacitor C6 and a capacitor C7 which are connected in parallel, the pin 13 is grounded through a capacitor C10, and the pin 14 is grounded through a capacitor C9, the protector comprises a chip U1, the pin 3, the pin 5 and the pin 6 of the U1 are connected with a singlechip, the pin 2 is connected with the power end, the pin 4 is connected with the power end through the capacitor C1 while being grounded, and the pin 7 is connected with an output pin of an operational amplifier U4A; the output pin of the operational amplifier U4A is connected with the power end through a resistor R43 and is grounded through a capacitor C20, the negative input pin is grounded through a resistor R41 and a capacitor C17 which are connected in parallel, the positive input pin is connected with the output pin of the operational amplifier U4B through a diode D5 cathode and a resistor R39 in sequence, the positive input pin of the operational amplifier U4A is grounded through a capacitor C13 and a resistor R40 which are connected in parallel, the positive power pin is connected with the power end and is grounded through a capacitor C31, and is connected with the positive input pin through a resistor R42, and the negative power pin is grounded; the negative input pin of the operational amplifier U4B is connected with the resistor R37 and is connected with the output pin through the capacitor C27 and the resistor R38 which are connected in parallel, and the positive input pin is connected with the resistor R35; the negative input pin of the operational amplifier U4C is connected with the resistor R33 and is connected with the output pin through the capacitor C26 and the resistor R34 which are connected in parallel, the positive input pin is connected with the resistor R32, and the output pin is connected with the positive input pin of the operational amplifier U4A through the resistor R39 and the diode D5 in sequence; the cathode input pin of the operational amplifier U4D is connected with the resistor R28 through a capacitor C25 and a resistor R29 which are connected in parallel, the anode input pin of the chip U5A is connected with the resistor R27, the output pin is connected with the positive input pin of the operational amplifier U4A through a resistor R30 and a diode D4 in sequence, the phase-sequence detection module circuit comprises a chip U5A and a chip U5B, the pin 1 of the chip U5A is connected with the pin 9 of the chip U5B, the pin 3 of the chip U5A is connected with the output end of the U6C through a resistor R20 while the pin 4 of the chip U5A is connected with the input pin 10 of the chip U5B, the pin 5 of the chip U5A is connected with the power end through a resistor R20, the pin 6 of the chip U5B is connected with the ground, the pin 11 of the chip U5B is connected with the output end of the chip U6A through a capacitor C38, the diode D6 is connected with the cathode end of the diode D6, the cathode end of the diode D5B is connected with the capacitor C19 and the resistor R21 while the cathode end of the chip U5A is connected with the resistor R6C 6, the GO2 is connected with the input pin 2 through the resistor R2 and the resistor R3, the GO2 is connected with the GO2 through the resistor R2, the GO2 is connected with the GO2 and the GO2, the GO2 is connected with the GO2 end of the GO2, the GO2 and the GO2 is connected with the GO2 through the input pin of the resistor R2, the GO2 and the GO2 is connected with the GO2, the GO2 and the GO2 through the GO2, the GO2 and the GO 2. Pin 1 of GO3 is connected to resistor R15 and pin 2 is connected to pin 1 through diode D9.
2. The bridge crane direct control system according to claim 1, wherein the protector further comprises an operational amplifier U2B, wherein a negative input pin of the operational amplifier U2B is connected with the resistor R4 and connected with an output pin through a capacitor C4 and a resistor R3 which are connected in parallel, a positive input pin is connected with the resistor R5, an output pin is connected with a positive input pin of the operational amplifier U3B through a resistor R6 and a diode D7 in sequence, the positive input pin of the operational amplifier U3B is grounded through a diode C7 and a resistor R23 which are connected in parallel, a negative input pin is connected with a power supply terminal through a resistor R25 while connected with a ground through a diode C10 and a resistor R24 which are connected in parallel, and an output terminal is connected with the power supply terminal through a resistor R26 while connected with a ground through a capacitor C21.
3. The bridge crane direct control system according to claim 1, wherein the protector further comprises an operational amplifier U2C, wherein a negative input pin of the operational amplifier U2C is connected with the resistor R8 and connected with an output pin through a capacitor C5 and a resistor R7 which are connected in parallel, a positive input pin is connected with the resistor R9, an output pin is connected with a positive input pin of the operational amplifier U3C through a resistor R10 and a diode D8 in sequence, the positive input pin of the operational amplifier U3C is grounded through a diode C8 and a resistor R22 which are connected in parallel, a negative input pin is connected with a power supply terminal through a resistor R20 while connected with a ground through a diode C11 and a resistor R21 which are connected in parallel, and an output terminal is connected with the power supply terminal through a resistor R19 while connected with the ground through a capacitor C22.
4. The bridge crane direct control system according to claim 1, wherein the protector further comprises an operational amplifier U2D, wherein a negative input pin of the operational amplifier U2D is connected with the resistor R12 and is connected with the output pin through the capacitor C6 and the resistor R11 which are connected in parallel, a positive input pin is connected with the resistor R13, the output pin is connected with a positive input pin of the operational amplifier U3D through the resistor R14 and the diode D9 in sequence, the positive input pin of the operational amplifier U3D is grounded through the diode C9 and the resistor R15 which are connected in parallel, a negative input pin is connected with the power end through the resistor R17 while being grounded through the diode C12 and the resistor R16 which are connected in parallel, and the output end is connected with the power end through the resistor R18 while being grounded through the capacitor C23.
5. The bridge crane direct control system according to claim 1, wherein the relays comprise a total stop relay and a function control relay, the total stop relay comprises K1, K2 and K3, three phases are conducted to A, B, C through triodes, the three phases are electrified along with a total stop relay switch, the function control relay comprises K4, K5, K6 and K7, the function control is completed by the K4, K5, K6 and K7 relays controlled by A, B two phases, and positive rotation and reverse rotation of the K4, K5, K6 and K7 control motors are respectively defined.
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