CN109205450B - Electric control permanent magnet lifting appliance for Shan Zhangfang plate and single plate release control method - Google Patents
Electric control permanent magnet lifting appliance for Shan Zhangfang plate and single plate release control method Download PDFInfo
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- CN109205450B CN109205450B CN201811148759.9A CN201811148759A CN109205450B CN 109205450 B CN109205450 B CN 109205450B CN 201811148759 A CN201811148759 A CN 201811148759A CN 109205450 B CN109205450 B CN 109205450B
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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
- B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
- B66C1/04—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by magnetic means
- B66C1/06—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by magnetic means electromagnetic
- B66C1/08—Circuits therefor
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- Load-Engaging Elements For Cranes (AREA)
Abstract
The invention discloses an electric control permanent magnet lifting appliance for a single plate, which comprises an electric control permanent magnet assembly, a main controller, a rectifying circuit and a detection assembly, wherein the main controller is connected with the electric control permanent magnet assembly; when the main controller controls the rectifying circuit to supply forward exciting current to the exciting coil of the electric control permanent magnet assembly, the electric control permanent magnet assembly generates magnetic field force for adsorbing the plurality of metal plates and lifts the plurality of metal plates to a preset position; then reverse exciting current is introduced into the exciting coil, so that the magnetic field force of the adsorption metal plate is gradually reduced; when the detection assembly detects that the single metal plate falls, the reduction of the magnetic field force of the electric control permanent magnet assembly is stopped, and the falling of the single metal plate at the lowest end is completed. The electric control permanent magnet lifting appliance for the Shan Zhangfang plate automatically controls the single metal plate to be placed without observation and control of staff, reduces the operation difficulty of the staff to a great extent, and improves the precision of the single metal plate. The invention also provides a control method of the electric control permanent magnet lifting tool Shan Zhangfang plate, which has the beneficial effects.
Description
Technical Field
The invention relates to the field of industrial lifting appliances, in particular to an electric control permanent magnet lifting appliance for a single plate and a control method of an electric control permanent magnet lifting appliance Shan Zhangfang plate.
Background
The electric permanent magnet lifting appliance is used as safe, economical and environment-friendly magnetic conduction material lifting appliance equipment, and has been widely applied to industries such as steel, logistics, transportation, mechanical manufacturing and the like. When the electro-permanent magnet is used as a steel plate lifting tool, in order to improve the conveying benefit, customers often do not meet the requirement of lifting and dropping a single steel plate, sometimes a plurality of steel plates need to be lifted at the same time, and Shan Zhangshan steel plates are dropped when dropped.
In the process of carrying out single plate placing on the steel plates by the electric permanent magnet crane in the current market, a worker is required to manually reduce or cut off exciting current passing through an exciting coil, and carefully observe whether the steel plates at the lowest end are placed, and once the steel plates are placed, the reduction or the switching-on of the exciting current is stopped immediately so as to prevent more steel plates from being placed. In the whole operation process, the operation difficulty of the staff is high, the staff is required to react rapidly, and otherwise, the problem of failure in placing a single steel plate occurs.
Disclosure of Invention
The invention aims to provide an electric control permanent magnet lifting appliance for a single plate and a single plate control method, which solve the problem that Shan Zhangfang plates are difficult to operate when a plurality of metal plates are lifted.
In order to solve the technical problems, the invention provides an electric control permanent magnet lifting appliance for a single plate, which comprises the following components:
the device comprises an electric control permanent magnet assembly, a main controller, a rectifying circuit and a detection assembly;
the main controller is used for controlling the rectifying circuit to supply forward exciting current or reverse exciting current to the exciting coil in the electric control permanent magnet assembly;
the electric control permanent magnet assembly is used for generating magnetic field force for adsorbing a plurality of metal plates when forward exciting current is introduced into the exciting coil, and lifting the metal plates to a preset position; when reverse exciting current is introduced into the exciting coil, reducing magnetic field force for adsorbing the metal plates, so that a single metal plate positioned at the lowest end of a plurality of metal plates falls;
the detection assembly is used for detecting that a single metal plate positioned at the lowest end falls, and sending a trigger signal for stopping supplying reverse exciting current to the exciting coil to the main controller when detecting that the single metal plate falls.
The detection assembly comprises a gravity detection device and is used for detecting the gravity of the metal plate adsorbed by the electric control permanent magnet assembly; and when the gravity generates abrupt change, sending the trigger signal to the main controller.
The gravity detection device is a tension sensor arranged above the electric control permanent magnet assembly.
The detection assembly comprises a magnetic flux detection device and is used for detecting magnetic flux of the magnetic conductive magnetic poles of the electric control permanent magnet assembly, wherein the magnetic flux is absorbed by the metal plates, and when mutation occurs in the magnetic flux, the trigger signal is sent to the main controller.
The magnetic flux detection device comprises an induction coil wound on the magnetic conduction magnetic pole and is used for detecting and obtaining an induction current value of the induction coil and determining a change value of magnetic flux of the magnetic conduction magnetic pole.
The invention also provides a Shan Zhangfang plate control method of the electric control permanent magnet lifting appliance, which adopts the electric control permanent magnet lifting appliance for Shan Zhangfang plates, and comprises the following steps:
the method comprises the steps that a rectifying circuit is controlled to supply forward exciting current to an exciting coil of an electric control permanent magnet assembly, so that the electric control permanent magnet assembly generates magnetic field force for adsorbing a plurality of metal plates;
lifting the plurality of adsorbed metal plates to a preset position;
controlling the rectifying circuit to feed reverse exciting current to the exciting coil;
receiving a trigger signal sent by a detection device, wherein the trigger signal is a signal sent by the detection device when the detection device detects that a single metal plate positioned at the lowest end of a plurality of metal plates is dropped;
and controlling the rectifying circuit to interrupt the reverse exciting current to the exciting coil.
The control rectifying circuit is used for supplying forward exciting current to the exciting coil of the electric control permanent magnet assembly, and the control rectifying circuit comprises the following components:
setting a preset voltage value and a preset magnetizing time according to the weight of the plurality of metal plates;
and introducing forward exciting current to the exciting coil according to the preset voltage value, wherein the duration of introducing the exciting current is the preset magnetizing duration.
Wherein the controlling the rectifier circuit to supply the reverse exciting current to the exciting coil includes:
and controlling the voltage value of the reverse exciting current which is fed into the exciting coil to gradually increase from a preset starting value, wherein the maximum value of the reverse exciting current is not greater than the preset voltage value.
The trigger signal sent by the receiving and detecting device comprises:
detecting the gravity values of a plurality of metal plates adsorbed by the electric control permanent magnet assembly in real time;
and when the gravity value is suddenly changed, sending the trigger signal.
The trigger signal sent by the receiving and detecting device comprises:
detecting the magnetic flux of the magnetic conductive magnetic pole of the electric control permanent magnet assembly in real time;
when the magnetic flux is suddenly changed, a trigger signal is sent.
The electric control permanent magnet lifting appliance for the Shan Zhangfang plate comprises an electric control permanent magnet assembly, wherein exciting current of the electric control permanent magnet assembly is controlled by a main controller and a rectifying circuit, and when forward exciting current is input into an exciting coil of the electric control permanent magnet assembly, the electric control permanent magnet assembly is in a magnetizing state and can generate magnetic field force for adsorbing a plurality of metal plates; when the plurality of metal plates are lifted to a preset position together, reverse exciting current is introduced into the electric control permanent magnet assembly so as to gradually reduce the magnetic field force generated by the electric control permanent magnet assembly; in addition, a detection device is further arranged, whether one metal plate positioned at the lowest end of the plurality of metal plates is placed or not can be detected, and once the metal plates are placed, the main controller is triggered to stop reducing the magnetic field force generated by the electric control permanent magnet assembly, and finally the metal plates can be adsorbed and Shan Zhangfang are placed. According to the electric control permanent magnet lifting appliance for the Shan Zhangfang plate, whether the single metal plate is placed or not is monitored directly through the detection device, a trigger signal can be automatically generated once the single metal plate is placed, the magnetic field force for placing and adsorbing the metal plate is further reduced, staff does not need to observe and control in the whole operation process, the operation difficulty of the staff is reduced to a great extent, and the accuracy of the single metal plate is improved.
The invention also provides a Shan Zhangfang plate control method of the electric control permanent magnet lifting appliance, which has the beneficial effects.
Drawings
For a clearer description of embodiments of the invention or of the prior art, the drawings that are used in the description of the embodiments or of the prior art will be briefly described, it being apparent that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from them without inventive effort for a person skilled in the art.
Fig. 1 is a block diagram of an electric control permanent magnet lifting appliance for a Shan Zhangfang plate according to an embodiment of the present invention;
fig. 2a is a schematic structural diagram of an electric control permanent magnet assembly according to an embodiment of the present invention for supplying a forward exciting current;
fig. 2b is a schematic structural diagram of an electric control permanent magnet assembly according to an embodiment of the present invention for supplying reverse exciting current;
fig. 3 is a schematic circuit diagram of a rectifying circuit according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a main controller according to an embodiment of the present invention;
fig. 5 is a flow chart of a lifting control method of an electric control permanent magnet lifting appliance provided by the embodiment of the invention.
Detailed Description
In order to better understand the aspects of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, fig. 1 is a block diagram of an electrically controlled permanent magnet lifting appliance for Shan Zhangfang boards according to an embodiment of the present invention, where the electrically controlled permanent magnet lifting appliance for single boards may specifically include:
an electric control permanent magnet assembly 1, a main controller 2, a rectifying circuit 3 and a detection assembly 4;
the main controller 2 is used for controlling the rectifying circuit 3 to supply forward exciting current or reverse exciting current to the exciting coil in the electric control permanent magnet assembly 1;
the electric control permanent magnet assembly 1 is used for generating magnetic field force for adsorbing a plurality of metal plates when forward exciting current is introduced into the exciting coil, and lifting the plurality of metal plates to a preset position; when reverse exciting current is introduced into the exciting coil, the magnetic field force of the adsorption metal plates is gradually reduced until a single metal plate positioned at the lowest end of the plurality of metal plates falls down;
the detection component 4 is used for detecting that the single metal plate positioned at the lowest end falls down, and sending a trigger signal for stopping reducing the magnetic field force of the electric control permanent magnet component to the main controller when the falling down of the single metal plate is detected.
In order to facilitate further understanding of the technical solution of the present invention, the following describes in detail the various components of the electrically controlled permanent magnet lifting appliance for Shan Zhangfang panels.
Specifically, as shown in fig. 2a and fig. 2b, fig. 2a is a schematic structural diagram of the electric control permanent magnet assembly provided by the embodiment of the present invention for supplying forward exciting current, and fig. 2b is a schematic structural diagram of the electric control permanent magnet assembly provided by the embodiment of the present invention for supplying reverse exciting current; the electronic control permanent magnet assembly comprises:
a neutral body 10 of crown structure, a reversible permanent magnet 11, a magnetically permeable pole 13 and an irreversible permanent magnet 12 disposed inside the neutral body 10.
The irreversible permanent magnets 12 and the magnetic poles 13 are alternately arranged; the reversible permanent magnet 11 is arranged at one end of the magnetic conductive magnetic pole 13, and an exciting coil 14 is wound on the reversible permanent magnet 11; the end of the magnetically permeable pole 13 facing away from the reversible permanent magnet 11 extends outwardly from the open end of the neutral body 10.
When the exciting coil 14 is charged with a forward exciting current, as shown in fig. 2a, the magnetic field lines generated by the reversible permanent magnet 11 and the irreversible permanent magnet 12 have the same direction and repel each other, so that the position of the magnetic conductive magnetic pole 13 close to the opening end of the neutral body 10 generates magnetic leakage, and a magnetic leakage magnetic field is formed, and the magnetic leakage magnetic field can generate magnetic field force for adsorbing the steel plate 15.
When reverse exciting current is introduced into the exciting coil 14, as shown in fig. 2b, the directions of magnetic field lines generated by the reversible permanent magnet 11 and the irreversible permanent magnet 12 are opposite to form a closed magnetic field loop together, so that the magnetic leakage magnetic field does not exist at the open end of the neutral body 10 of the magnetic conductive magnetic pole 13, and magnetic field force cannot be generated.
However, in the present invention, the forward exciting current is first applied to the exciting coil 14 for a certain period of time, after the reversible permanent magnet 11 is magnetized, the reversible permanent magnet 11 can be magnetized generally only by applying the exciting current for a few seconds, and after the reversible permanent magnet 11 has a magnetic field with a certain strength; when reverse exciting current is fed into the exciting coil 14, the magnetic field direction of the reversible permanent magnet 11 is not weakened immediately, but the original magnetic field strength is weakened gradually along with the feeding of the reverse exciting current until the time of feeding the reverse exciting current reaches a certain time, the magnetic field strength of the reversible permanent magnet 11 is reduced to zero, and if the feeding of the reverse exciting current is continued, the magnetic field strength of the reversible permanent magnet 11 is increased reversely, and the magnetic field line distribution generated by the reversible permanent magnet 11 and the irreversible permanent magnet 12 shows the magnetic field line shown in fig. 2 b.
Therefore, in the present invention, the forward exciting current is first introduced into the exciting coil 14, after the reversible permanent magnet 11 is magnetized, the magnetic conductive magnetic pole 13 can absorb the plurality of metal plates, when the plurality of metal plates Shan Zhangfang need to fall, the reverse exciting current is introduced into the exciting coil 14, so that the magnetic field force of the magnetic conductive magnetic pole 13 absorbing the metal plates is reduced, until the detecting device detects that a single metal plate falls, the reverse exciting current is stopped being introduced into the exciting coil 14, and the magnetic field force of the magnetic conductive magnetic pole 13 absorbing the metal plates is not reduced any more, thus the remaining unrelieved metal plates can be absorbed.
In addition, the reversible permanent magnet can be a magnet prepared from materials such as neodymium iron boron permanent magnet materials.
The rectifying circuit provided by the invention is shown in fig. 3, and fig. 3 is a circuit schematic diagram of the rectifying circuit provided by the embodiment of the invention, the rectifying circuit is communicated with the exciting coil, and through the working state of the rectifying circuit, the exciting coil can be supplied with forward exciting current and reverse exciting current with opposite directions.
For whether the rectifying circuit is used for supplying forward exciting current or reverse exciting current to the exciting coil, the voltage value of the supplied current and the duration of the supplied current are controlled by the main controller, the main controller can be an MCU main control circuit board, and the main controller is a singlechip chip, and the specific circuit structure can be referred to fig. 4, and fig. 4 is a circuit structure schematic diagram of the main controller provided by the embodiment of the invention.
The electric control permanent magnet lifting appliance for the Shan Zhangfang plate can input an instruction for lifting a plurality of metal plates through the main controller, and the main controller controls the rectifying circuit to introduce forward exciting current to the electric control permanent magnet assembly, so that the electric control permanent magnet assembly generates magnetic field force capable of adsorbing the plurality of metal plates, and one-time lifting of the plurality of metal plates is realized; when a plurality of metal plates are lifted to a preset position, a worker can input a command of a single plate to be lifted, at the moment, the main controller controls the rectifying circuit to supply reverse exciting current to the electric control permanent magnet assembly, so that the magnetic field force of the electric control permanent magnet assembly is gradually reduced, the adsorbed acting force of each metal plate is gradually reduced, the acting force of the metal plate at the lowest end of each metal plate is minimum, once the acting force is smaller than the gravity of the metal plate, the metal plate can be lifted, meanwhile, the detecting device detects whether the single metal plate at the lowest end is lifted or not in real time, if the single metal plate at the lowest end is lifted, a trigger signal is sent to the main controller, after the main controller receives the trigger signal, the rectifying circuit is controlled to cut off the exciting coil, the magnetic field force of the electric control permanent magnet assembly is not continuously reduced, and other metal plates can be adsorbed. In the whole control process, the staff only needs to input instructions.
Compared with the prior art, in the operation process of lifting a plurality of metal plates and Shan Zhangfang plates, a worker is required to visually observe whether Shan Zhangfang plates are completed or not, once the completion of a single plate is observed, the worker is required to manually execute the instruction of stopping reducing the magnetic field force, and the operation requirement on the worker is very high.
According to the invention, whether the operation of the single plate is finished or not is detected by the detection device, and once the automatic generation and transmission of the trigger signal are finished, manual detection is not needed, so that the operation of the single plate is more automatic, the operation difficulty of staff is reduced, the possibility of failure of the single plate caused by misoperation is reduced, and the operation precision of a plurality of electric control permanent magnet lifting appliances for Shan Zhangfang plates for lifting Shan Zhangfang plates is higher.
Based on the above embodiments, the detection device in the present invention may be various, and in a specific embodiment of the present invention, the detection device may include:
the gravity detection device is used for detecting the gravity of the metal plate adsorbed by the electric control permanent magnet assembly; when the gravity generates abrupt change, a trigger signal is sent to the main controller.
Alternatively, the gravity sensing device may be a tension sensor disposed above the electronically controlled permanent magnet assembly.
Specifically, after the metal plate is adsorbed by the electrically controlled permanent magnet assembly, the metal plate is also required to be lifted and conveyed to a corresponding position by lifting equipment such as a crane, a crane and the like. Therefore, a tension sensor can be arranged between the lifting equipment and the electric control permanent magnet assembly, the gravity of the object lifted below the lifting equipment is detected, and when the detected gravity suddenly changes and decreases, the lowest metal plate is completely placed.
Optionally, in another specific embodiment of the present invention, the detection device may specifically be:
the detection assembly comprises a magnetic flux detection device and is used for detecting the magnetic flux of the magnetic conductive magnetic pole of the adsorption metal plate in the electric control permanent magnet assembly, and when the magnetic flux is suddenly changed, a trigger signal is sent to the main controller.
Because the magnetic field lines below the magnetic conduction magnetic poles pass through the metal plates adsorbed by the back, when the metal plate at the lowest part is dropped, the magnetic field lines of the magnetic conduction magnetic poles are changed, and then the magnetic flux of the magnetic conduction magnetic poles is suddenly changed, so that whether the metal plate at the lowest part is dropped can be determined by detecting the magnetic flux change of the magnetic conduction magnetic poles.
Optionally, the magnetic flux detection device may specifically include an induction coil wound on the magnetic conductive pole, and is configured to detect an induction current value obtained from the induction coil, and determine a variation value of the magnetic flux of the magnetic conductive pole.
When the magnetic flux of the magnetic conductive magnetic pole changes, the induction coil correspondingly generates induction current. When the magnetic field force in the magnetic conductive magnetic pole gradually changes along with the reverse exciting current, the magnitude of the induction current in the induction coil is relatively stable; when the lowest metal plate is dropped, the magnetic flux of the magnetic conductive magnetic pole is suddenly changed, and the magnitude of the induction current value is suddenly increased, so that the method can be used as a standard for judging whether the single metal plate is dropped.
It should be noted that, only two specific examples of determining that a single metal plate falls through detecting abrupt changes of gravity and magnetic flux are given in the present invention, and other specific embodiments of detecting Shan Zhangfang plates according to the two similar principles shall fall within the scope of the present invention. In the actual operation process, other detection modes, such as detecting the induced current of the exciting coil, etc., are also adopted, and the invention is not specifically described.
The invention also provides an embodiment of a Shan Zhangfang plate control method of the electric control permanent magnet lifting appliance, which is used for controlling the Shan Zhangfang plate of the electric control permanent magnet lifting appliance for the Shan Zhangfang plate according to any embodiment, as shown in fig. 5, and fig. 5 is a flow diagram of a Shan Zhangfang plate control method of the electric control permanent magnet lifting appliance provided by the embodiment of the invention. The method may include:
step S1: the main controller controls the rectifying circuit to introduce forward exciting current into the exciting coil of the electric control permanent magnet assembly, so that the electric control permanent magnet assembly generates magnetic field force for adsorbing a plurality of metal plates.
Step S2: and driving the electric control permanent magnet assembly to hoist the plurality of adsorbed metal plates to a preset position through hoisting equipment.
Step S3: the main controller controls the rectifying circuit to supply reverse exciting current to the exciting coil.
Step S4: and detecting whether the single metal plate positioned at the lowest end of the plurality of metal plates is dropped or not in real time by a detection device, if so, entering a step S6, and if not, continuously executing the step S5.
Step S5: the main controller controls the rectifying circuit to continuously feed the gradually increased reverse exciting current to the exciting coil, and then the step S4 is performed.
It should be noted that, there is no obvious sequence of steps S3, S4 and S5. When the exciting current is started to be fed into the exciting coil, whether the single metal plate at the lowest end is dropped or not should be immediately detected in real time, if not, the step S5 is executed, the magnitude of the reverse exciting current is increased, and meanwhile, whether the Shan Zhangfang plate is finished or not still needs to be judged in real time.
Step S6: the detection device sends a trigger signal to the main controller.
Step S7: the main controller controls the rectifying circuit to interrupt the reverse exciting current to the exciting coil.
In this embodiment, when carrying out the amplifier to many metal sheets, can the automated inspection single metal sheet whether put and fall and accomplish, need not artifical naked eye and survey to accomplish the single metal sheet's of falling automatically, need not manual operation, improved the operation degree of difficulty and the operation accuracy that single metal sheet of many metal sheets handling put.
Alternatively, in another embodiment of the present invention, the step S1 may specifically include:
setting a preset voltage value and a preset magnetizing time according to the weight of the plurality of metal plates;
and introducing forward exciting current to the exciting coil according to a preset voltage value, wherein the duration of introducing the exciting current is the preset magnetizing duration.
It should be noted that, as described above, the magnitude of the magnetic force of the electric control permanent magnet assembly that adsorbs the metal plate is obtained by superposing the magnetic force generated by the reversible permanent magnet and the non-reversible permanent magnet, and the magnitude of the magnetic force of the non-reversible permanent magnet is constant, so that the magnitude of the magnetic force of the electric control permanent magnet assembly is determined by the magnitude and the direction of the magnetic force of the reversible permanent magnet.
The magnitude of the magnetic field force of the reversible permanent magnet is influenced by the voltage value and the magnetizing time of the exciting current of the exciting coil, so that the voltage value and the magnetizing time of the reversible permanent magnet can be set according to the weight of the metal plate.
In consideration of the fact that the reversible permanent magnet is required to be demagnetized in the subsequent plate releasing process, when the reversible permanent magnet is magnetized, the magnetic field force generated by the electric control permanent magnet assembly is ensured to be slightly larger than the total weight of the metal plate.
Optionally, in another specific embodiment of the present invention, the method may further include:
the voltage value of the reverse exciting current which is fed into the exciting coil is controlled to be gradually increased from a preset starting value, wherein the maximum value of the reverse exciting current is not larger than the preset voltage value.
Reverse exciting current is supplied to the exciting coil to demagnetize the reversible permanent magnet in a magnetized state.
Because the weight of the single metal plate is known, the minimum magnetic field force required to be reduced by the electric control permanent magnet assembly is known, namely, the preset starting value of the voltage value of the reverse excitation current is set according to the known minimum magnetic field force, the voltage of the reverse excitation current is prevented from increasing from 0, and the reverse excitation time of the reverse excitation current is prolonged.
Optionally, in another embodiment of the present invention, the step S5 may further include:
detecting the gravity values of a plurality of metal plates adsorbed by the electric control permanent magnet assembly in real time through a gravity detection device;
when the gravity value is suddenly changed, the gravity detection device sends a trigger signal to the main controller.
Specifically, the total weight of the metal plates adsorbed by the electric control permanent magnet assembly can be detected, and when the metal plate at the lowest end is dropped, the total weight of the metal plates adsorbed by the electric control permanent magnet assembly is suddenly reduced by about the mass of one metal plate, namely, the fact that the metal plate at the lowest end is dropped is determined according to the total weight.
Alternatively, in another embodiment of the present invention, the step S5 may specifically include:
detecting the magnetic flux of the magnetic conductive magnetic pole of the electric control permanent magnet assembly in real time through a magnetic flux detection device;
when the magnetic flux is suddenly changed, the magnetic flux detection device sends a trigger signal to the main controller.
According to the invention, the main controller controls the rectifying circuit to magnetize and demagnetize the electric control permanent magnet assembly, the detecting device is matched to detect the falling condition of the metal plate, the falling condition of the metal plate is fed back to the main controller, and the main controller controls the exciting current which is introduced into the electric control permanent magnet assembly based on the falling condition of the metal plate, so that the electric control permanent magnet lifting appliance can automatically realize the operational amplification of a single metal plate.
When the electric control permanent magnet assembly magnetizes, the main controller automatically calculates the voltage value of forward exciting current required by forward direction according to the inputted magnetic penetration depth, the rectifying circuit is triggered according to the time of the forward exciting current set in the main controller, the forward exciting current carries out forward exciting on the reversible permanent magnet, the forward exciting current can automatically collect the exciting current through the collecting circuit, when the forward exciting current reaches the required set value in the set time, the magnetic flux detecting device detects the magnetic flux of the magnetic conducting magnetic pole again, if the magnetic flux also reaches the set value, a magnetizing success signal is reported, and a plurality of metal plates are adsorbed and can be lifted. Otherwise, reporting fault signals.
When the electric control permanent magnet assembly demagnetizes, the main controller triggers the rectifying circuit according to the set reverse exciting voltage value, and triggers the rectifying circuit according to the time of the set reverse exciting current in the main controller, the reverse exciting current carries out reverse excitation on the reversible permanent magnet, and the magnitude of the reverse exciting current can be automatically acquired through the acquisition circuit.
When the reverse exciting current reaches a required set value within a set time, the magnetic flux detection device detects the magnetic flux of the magnetic conductive magnetic pole, if the magnetic flux is reduced to zero, a demagnetizing success signal is sent, and the metal plates are all released, otherwise, a fault signal is sent.
When the metal plate Shan Zhangfang is operated, the main controller triggers the rectifying circuit according to the set voltage starting value of the reverse exciting current, the reverse exciting current is gradually increased, the increasing amplitude, increasing time, starting value and upper limit value of the reverse exciting current can be set through parameters in the main controller, and the voltage maximum value of the reverse exciting current cannot exceed the upper limit value.
The starting value is the maximum trigger angle of the reverse exciting current, and the trigger angle of the 3-phase full-wave rectifying circuit of the rectifying circuit is the conduction angle of the trigger silicon controlled rectifier. The upper limit value is set according to the thinnest plate thickness of the lifting machine, namely, the minimum triggering angle for ensuring that the last metal plate does not fall off is ensured, and the maximum reverse exciting current for ensuring that the last metal plate does not fall off is correspondingly ensured.
With the continuous increase of reverse exciting current, the magnetic field intensity of the reversible permanent magnet is reduced, but the magnetic field direction of the reversible permanent magnet is not changed sufficiently, and the magnetic field intensity generated by the electric control permanent magnet assembly to the outside is gradually reduced, so that the lowest metal plate falls. After the detection device detects that the metal plate falls, a trigger signal is sent to the main controller, and the main controller stops triggering the reverse exciting current by the rectifying circuit in time.
In order to ensure that the rest metal plates cannot accidentally fall, one-time magnetizing operation can be performed according to the set strength of charging and discharging, the magnetizing operation generally takes 0.3-0.5 seconds, and the metal plates which do not fall are firmly adsorbed, so that the action of the Shan Zhangfang plates is completed.
Meanwhile, the main controller temporarily stores the reverse trigger current value and the trigger angle, and takes the temporary storage value as a starting value when the single metal plate is put next time, so that the time for gradually increasing the reverse exciting current when the reverse exciting current is triggered again is shortened, and the time for putting the second metal plate is shortened.
In the process, the feedback signal of the magnetic flux detection device is not adopted, the signal of the gravity detection device is adopted, the gravity detection device is positioned at the top end of the lifting appliance, after the lifting appliance lifts off the ground, the gravity detection device monitors the total weight of the lifting appliance and the sucked steel plate at all times, when the total weight is reduced and exceeds a set minimum amplitude, the metal plate falls, the gravity detection device immediately feeds back the signal to the main controller, and the main controller adopts the same coping action, so that the metal plates are ensured to be singly placed one by one.
The specific detection mode of the magnetic flux detection device can adopt two principles:
firstly, when the magnetic flux in the magnetic conductive magnetic pole changes, a corresponding induced voltage is generated in the induction coil, and the induced voltage is subjected to integral operation by utilizing an integral circuit, so that the change of the magnetic flux is tracked, and when the magnetic flux is instantaneously reduced, the lowest steel plate can be judged to be dropped.
Secondly, the induction voltage in the induction coil is amplified, when the magnetic flux in the magnetic conductive magnetic pole suddenly changes, the induction coil can generate instant induction voltage, and when the amplitude of the induction voltage exceeds a set value, the lowest steel plate can be judged to be dropped.
In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, so that the same or similar parts between the embodiments are referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
Claims (10)
1. The electric control permanent magnet lifting appliance for the single plate is characterized by comprising an electric control permanent magnet assembly, a main controller, a rectifying circuit and a detection assembly;
the main controller is used for controlling the rectifying circuit to supply forward exciting current or reverse exciting current to the exciting coil in the electric control permanent magnet assembly;
the electric control permanent magnet assembly is used for generating magnetic field force for adsorbing a plurality of metal plates when forward exciting current is introduced into the exciting coil, and lifting the metal plates to a preset position; when reverse exciting current is introduced into the exciting coil, the magnetic field force for adsorbing the metal plates is gradually reduced until a single metal plate positioned at the lowest end of the plurality of metal plates falls down;
the detection component is used for detecting that a single metal plate positioned at the lowest end falls, and sending a trigger signal for stopping reducing the magnetic field force of the electric control permanent magnet component to the main controller when detecting that the single metal plate falls.
2. The electrically controlled permanent magnet hanger for Shan Zhangfang boards of claim 1, wherein the detecting assembly comprises a gravity detecting device for detecting the magnitude of gravity of the metal board absorbed by the electrically controlled permanent magnet assembly; and when the gravity generates abrupt change, sending the trigger signal to the main controller.
3. The electrically controlled permanent magnet hanger for Shan Zhangfang panels of claim 2, wherein the gravity sensing device is a tension sensor disposed above the electrically controlled permanent magnet assembly.
4. The electrically controlled permanent magnet hanger for Shan Zhangfang boards of claim 1, wherein said detecting assembly comprises a magnetic flux detecting means for detecting the magnetic flux of the magnetically permeable poles of said electrically controlled permanent magnet assembly attracting said metal boards, and when said magnetic flux is abrupt, transmitting said trigger signal to said main controller.
5. The electrically controlled permanent magnet hanger for Shan Zhangfang boards of claim 4, wherein said magnetic flux detecting means comprises an induction coil wound around said magnetically permeable poles for detecting the value of the induction current obtained from said induction coil and determining the variation of the magnetic flux of said magnetically permeable poles.
6. An electrically controlled permanent magnet lifting appliance Shan Zhangfang board control method employing an electrically controlled permanent magnet lifting appliance as claimed in any one of claims 1 to 5 for Shan Zhangfang boards, comprising:
the method comprises the steps that a rectifying circuit is controlled to supply forward exciting current to an exciting coil of an electric control permanent magnet assembly, so that the electric control permanent magnet assembly generates magnetic field force for adsorbing a plurality of metal plates;
lifting the plurality of adsorbed metal plates to a preset position;
controlling the rectifying circuit to feed reverse exciting current to the exciting coil;
receiving a trigger signal sent by a detection device, wherein the trigger signal is a signal sent by the detection device when the detection device detects that a single metal plate positioned at the lowest end of a plurality of metal plates is dropped;
and controlling the rectifying circuit to interrupt the reverse exciting current to the exciting coil.
7. The method of claim 6, wherein the controlling the rectifier circuit to apply a forward exciting current to the exciting coil of the electronically controlled permanent magnet assembly comprises:
setting a preset voltage value and a preset magnetizing time according to the weight of the plurality of metal plates;
and introducing forward exciting current to the exciting coil according to the preset voltage value, wherein the duration of introducing the forward exciting current is the preset magnetizing duration.
8. The method of controlling a Shan Zhangfang panel of claim 7, wherein said controlling said rectifier circuit to apply a reverse excitation current to said excitation coil comprises:
and controlling the voltage value of the reverse exciting current which is fed into the exciting coil to gradually increase from a preset starting value, wherein the maximum voltage value of the reverse exciting current is not larger than the preset voltage value.
9. A Shan Zhangfang panel control method according to any one of claims 6 to 8, wherein the receiving the trigger signal transmitted by the detecting means comprises:
detecting the gravity values of a plurality of metal plates adsorbed by the electric control permanent magnet assembly in real time;
and when the gravity value is suddenly changed, sending the trigger signal.
10. A Shan Zhangfang panel control method according to any one of claims 6 to 8, wherein the receiving the trigger signal transmitted by the detecting means comprises:
detecting the magnetic flux of the magnetic conductive magnetic pole of the electric control permanent magnet assembly in real time;
when the magnetic flux is suddenly changed, a trigger signal is sent.
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| CN201811148759.9A CN109205450B (en) | 2018-09-29 | 2018-09-29 | Electric control permanent magnet lifting appliance for Shan Zhangfang plate and single plate release control method |
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| CN201811148759.9A CN109205450B (en) | 2018-09-29 | 2018-09-29 | Electric control permanent magnet lifting appliance for Shan Zhangfang plate and single plate release control method |
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| JP2545609B2 (en) * | 1989-07-07 | 1996-10-23 | 新日本製鐵株式会社 | Device for controlling the number of steel plates suspended by a lifting electromagnet |
| JPH0759468B2 (en) * | 1989-10-16 | 1995-06-28 | 新日本製鐵株式会社 | Steel plate hanging number selection control method |
| US5998944A (en) * | 1997-03-07 | 1999-12-07 | Caterpillar Inc. | Method and apparatus for controlling a lifting magnet of a materials handling machine |
| CN101891105B (en) * | 2010-06-17 | 2014-01-15 | 武汉港迪电气有限公司 | Electric permanent-magnetic lifting appliance for lifting multilayer steel plates |
| CN202704790U (en) * | 2012-07-23 | 2013-01-30 | 株洲悍威磁电科技有限公司 | Electric permanent magnet lifting tool for lifting a plurality of steel plates |
| CN104876108A (en) * | 2014-02-28 | 2015-09-02 | 大连星航机电设备有限公司 | Lifting electromagnet control apparatus for accurately sucking and lifting single steel plate |
| CN208883273U (en) * | 2018-09-29 | 2019-05-21 | 株洲悍威磁电科技有限公司 | A kind of electric control permanent magnet hanger for putting plate for individual |
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