NL2032477B1

NL2032477B1 - Intelligent electromagnetic hoist

Info

Publication number: NL2032477B1
Application number: NL2032477A
Authority: NL
Inventors: Chen Jingfeng; Chen Jingsheng; Lu Wuhai; Zhang Jianhua
Original assignee: Shandong Luci Industrial Tech Co Ltd
Priority date: 2021-07-13
Filing date: 2022-07-13
Publication date: 2023-06-21
Also published as: NL2032477A; CN113353775A

Abstract

Provided is an intelligent electromagnetic hoist. An electromagnetic hanging beam can be mounted on a floor type 40T double—beam gantry crane with a span of 30 m. The electromagnetic hoist can hoist H—shaped, steel in bulk and attract and hoist deformed steel bars, H—shaped steel, and steel sheets, and ensures effective attractive transport and smooth running. A control system of the electromagnetic hoist features no contact and high reliability, with a silicon controlled rectifier technology employed. The electromagnetic hoist employs a power inversion technology. The electromagnetic hoist has the fourth generation automatic charge control panel as a charge part, where the automatic charge panel is composed of a step—down rectifier transformer, a synchronous transformer TR2, a three—phase rectifier module, and a set of automatic control circuits. A GTBM— UPS—l5KW—series inverter control apparatus is selected as the control system of the electromagnetic hoist

Description

INTELLIGENT ELECTROMAGNETIC HOIST

TECHNICAL FIELD

The present invention belongs to the technical field of ma- chining processes, relates to a forming process, and in particular to an intelligent electromagnetic hoist.

BACKGROUND ART

Upon entering the mature development stage, the magnetic ap- paratus industry in China is large but not strong. It is learn that the magnetic apparatus industry has great differences from other countries in 1, precision, stability, reliability, etc; 2, composite performance of magnetic apparatuses; and 3, numerical control systems. Siemens and Liebherr in German, Tecnomagnete in

Italy, and Mazak and Fanuc in Japan master the most advanced nu- merical control system that is the core of the numerical control magnetic apparatus. The cost of 16 software packages of the

Liebherr numerical control system approaches that of the machine tool. The software and the machine tool are bundled together for sale, not sold separately, so as to obtain the considerable profit of the software.

SUMMARY

In order to solve the technical problems described above, an objective of the present invention is to provide an intelligent electromagnetic hoist. The product breaks through a technical bot- tleneck encountered in a hoisting industry, and has a wide range of applications of transporting materials in bulk and in bundle, and hoisting goods and containers. Moreover, with high safety per- formance, the product may ensure safety of a transported material as well as people and an apparatus, has perfect monitoring and protection measures, and is used in a variety of environments. In addition, the product features precise control, a high efficiency, flexibility, controllability, high reliability, high control pre- cision, strong interference resistance, high intelligence, auto-

matic charge, automatic tracking, automatic adjustment, and auto- matic switching. The product has various performance indexes over national standard requirements. Owing to the development of domes- tic and foreign port trade, the launch of the product improves a transport efficiency significantly, saves on manpower, and materi- al and financial resources, and promotes improvements in port, wharf hoisting industry technically.

In order to realize the objective described above, the pre- sent invention employs the technical solution as follows: an in- telligent electromagnetic hoist includes electromagnets, where the electromagnet is connected to an electromagnetic hanging beam through a chain, the electromagnetic hanging beam is connected to a double-beam gantry crane, a control system controls rising and falling of an entire electromagnetic hoist, and four or eight electromagnets are jointly hung on the electromagnetic hanging beam through chains, an electromagnetic chuck has a size<1600 mm*800 mm, and the electromagnetic hoist has a magnetization and demagnetization time<4 s, and a demagnetization time<3 s.

Preferably, the electromagnetic hanging beam of the electro- magnetic hoist may be mounted on a floor type 40T double-beam gan- try crane with a span of 30 m, and has functions of magnetic latching in power off, and lowering a main hook when an apparatus fails and power is cut off.

Preferably, the electromagnetic hoist divides the electromag- net into two parts, employs a double-wire packet sub-control mode, and uses electrical pure iron as a main magnetism conduction mate- rial.

Preferably, the electromagnetic hoist may hoist H-shaped steel in bulk, and attract and hoist deformed steel bars, H-shaped steel, and steel sheets with a length of 12 m in bundle technical- ly, and ensures effective attractive transport and smooth running.

Preferably, the control system of the electromagnetic hoist features no contact and high reliability, with a silicon con- trolled rectifier (SCR) technology employed.

Preferably, the electromagnetic hoist employs a power inver- sion technology.

Preferably, the electromagnetic hoist has the fourth genera-

tion automatic charge control panel as a charge part, where the automatic charge panel is composed of a step-down rectifier trans- former, a synchronous transformer TR2, a three-phase rectifier module, and a set of automatic control circuits.

Preferably, a GTBM-UPS-15KW-series inverter control apparatus is selected as the control system of the electromagnetic hoist.

A welding procedure: in a general assembly process of the electromagnet, an air tightness test is carried out strictly under pressure of 1 Mpa after welding, and all welding seams are coated with soapy water, until no bubble is generated.

A coil winding procedure: after a coil is wound, a turn-to- turn insulation test and a withstand voltage test to ground must be conducted. The turn-to-turn insulation test: A power frequency voltage of 550 V is applied by one minute, no short circuit and flashover phenomena are generated. The withstand voltage test: a power frequency voltage of 2500 V is applied by one minute, no short circuit and flashover phenomena are generated.

The electromagnet is divided into two parts, the double-wire packet sub-control mode is employed, and the electrical pure iron is used as the main magnetism conduction material. The magnetiza- tion and demagnetization time is short, magnetic field intensity is high, uniform, and stable, and magnetism adjustment is facili- tated. The soft electrical pure iron does not tend to damage a surface of the steel sheet.

When being used for hoisting the steel, the electromagnet is symmetrically distributed on the steel. In this way, main magnetic flux generated when the electromagnet works forms a closed magnet- ic loop in the following order: a coil core, an inner magnetic pole, the steel sheet, an outer magnetic pole, a bell cover, and returning to an original coil core. A main magnetic field generat- ed by the electromagnet fully magnetizes the steel sheet, to gen- erate a strong electromagnetic attractive force, so as to ensure safe hoisting of the steel. When the sheets are required to be separated, one coil is employed, to attract a few sheets, and then magnetism is adjusted for separation.

An electromagnetic hoist form: the electromagnetic hoist with four electromagnets used in combination is employed, and the elec-

tromagnets are connected to the electromagnetic hanging beam through the chains.

The electromagnetic hoist has the magnetization and demagnet- ization time<4 s, and the demagnetization time<3 s.

When the electromagnetic hoist works normally, work perfor- mance of an original apparatus is not influenced.

A demagnetized steel sheet has no residual magnetism (no in- fluence on performance of the steel sheet).

The electromagnetic field is configured with an advanced sub- control technology, so that an attractive force in an effective space of the magnetic field is maximized.

The electromagnet features deep magnetic permeability and a large attractive force, thereby ensuring hoisting safety.

An advanced heat dissipation technology reduces a temperature rise and heat of the coil.

An insulation material has a heat-resistant grade up to C.

A cable connection is firm, a quick connector is provided with an anti-falling device (including a drum cable connector), a cable connector is additionally provided, and an external power line is protected by a protective housing, so as to realize a pro- tection effect.

A surface of a housing of the electromagnet is subjected to shot blasting treatment, and polished smooth without burr. A sur- face of a housing with sharp edges is coated with two layers of primer and two layers of finish paint. A surface of an electromag- netic chuck is coated with a safety sign.

A terminal box on the electromagnet is provided with a termi- nal (well sealed) facilitating cable replacement and subjected to insulation protection.

The control system of the electromagnet employs the silicon controlled rectifier technology combined with a programmable logic controller (PLC), of which a main circuit is a system similar to a logic non-loop reversible system. Forward and reverse silicon con- trolled rectifiers of the system are both interlocked through PLC program control. During material attraction, the forward silicon controlled rectifier is connected, and the reverse silicon con- trolled rectifier is locked. During material releasing, the for-

ward silicon controlled rectifier is first controlled to shift a phase to an inversion state, and energy of the electromagnet is fed back to a power grid. In addition, some energy is absorbed by de-excitation resistors FDR3 and V2. After a forward current be- 5 comes 0, the forward silicon controlled rectifier is disconnected, and after a delay of 1.5 s, the reverse silicon controlled recti- fier is triggered to be connected, and a reverse demagnetization voltage is applied to the electromagnet. A time for applying the reverse demagnetization voltage is adjusted through a time relay in a central processing unit CPU of 37-200. After the reverse voltage stops demagnetizing, reverse demagnetization energy is rapidly consumed in the resistors FDR3 and V2, and disconnection of the reverse SCR is accelerated, so that an operation frequency is increased, and an entire electrical control system is advanced technically, precise, and reliable. According to the present sys- tem, the control mode features good softness, expansibility, and flexibility, and an entire device features good interference re- sistance, a wide phase shift range, a few external elements, sim- ple and convenient mounting and adjustment, and reliable use.

Perfect monitoring and protection measures:

The electrical control system has the perfect monitoring and protection measures. The system is protected against short cir- cuit, phase loss, an undervoltage, voltage loss, an overvoltage, etc. The system further has incoming power monitoring, module fast fuse protection, alternating current side varistor overvoltage protection, direct current side resistance-capacitance absorption, etc. A voltage and a current of the system enter the PLC for fault diagnosis through a transmitter, to ensure a reliable input of a magnetic latching system when the system fails, thereby avoiding major personal and apparatus accidents such as material falling, and the perfect system monitoring and protection measures ensure reliable running of the system reliably. When the control system is designed, fault signals, electromagnet selection signals, etc. are all sent into the PLC, which is conducive to flexible control.

Employing the power inversion technology to ensure running safety:

When the power is cut off in a running process of attracting a material by the electromagnet, the magnetic latching system car- ries out magnetic latching automatically. When an overhead crane runs to a safe and open position, the system employs the power in- version technology, to invert power of a battery, and supplies in- verted power to a hoisting band-type brake electric motor of the crane, an alternating current electric motor is turned on to lower the attracted material slowly, and a trolley travels left and right, to ensure the safety of people and the apparatus.

Employing special interference resistance measures for power

Generally, power of an excitation and magnetic latching sys- tem is sourced from an isclated conductor rail of the crane. The power features numerous harmonic components and a large waveform distortion. The system tends to generate heat, and the control system tends to be interfered, resulting in failure or misopera- tion. In order to ensure system stability and a reliable magnetic latching action without material falling in a failure, the product of the present invention employs a plurality of special interfer- ence resistance measures. An incoming power line is added with a rectifier transformer in delta connection, a main loop is added with a resistance-capacitance absorber and a three-phase power filter, independent DC 24 V switch power is employed to ensure that in an environment of the overhead crane, the system has high- ly-reliable interference resistance and running reliability.

Upgrading and updating the charge part:

The automatic charge panel has been upgraded to the fourth generation automatic charge control panel so far, where the auto- matic charge panel is composed of the step-down rectifier trans- former, the synchronous transformer TR2, the three-phase rectifier module, and one set of automatic control circuits. Constant charge, floating charge, automatic tracking, automatic adjustment, and automatic switching are realized. YC-ACCB is a trigger pulse forming circuit board, which controls rectification of a three- phase half-controlled rectifier module. JI-1 and J1-2 are current feedback signals, and J1-2 and J1-3 are voltage feedback signals, to ensure that output direct current power is constant voltage current limiting power, so as to satisfy requirements of charging the battery. Overvoltage detection is realized through a Hall ele-

ment sensor, and a pointer voltmeter and an ammeter are arranged in a meter box of a cab, to display a voltage of the battery and a charge current.

An electrical control device: input power: AC 380 V 50 Hz, three-phase; output voltage: DC 220 V; output current: 200 A; and protection grade: IP54 sub-control mode: the electromagnetic chuck is required to have a sub-control capacity, and an excitation and demagnetization time<3 s. It is required to have functions of un- dervoltage protection, short-circuit protection, overvoltage pro- tection, misoperation protection, protection and alarm in the case of open circuit of an excitation switch of the electromagnetic chuck, etc., and to describe the functions in detail. It is also required to have a function of inversion; the main loop is re- quired to have no contact; and an excitation circuit is controlled by Siemens S7-226 or S7-224. A contactless module employs a sili- con controlled rectifier, and an energy feedback module employs an insulated gate bipolar transistor (IGBT).

The GTBM-UPS-15KW-series inverter control apparatus:

When direct current power is required to be inverted into al- ternating current power after the power is cut off, the GTBM-UPS- 15KW is mainly used for lowering the main hook, and another GTBM-

UPS-15KW-series inverter control apparatus is additionally config- ured for the trolley to travel left and right. Currently, direct current power of a storage battery is inverted into 39 50 Hz 380 V alternating current power through an inverter. When power of an external line of the power grid is cut off suddenly in a process of attracting the material by the electromagnet, an alternating current band-type brake of a winch may be energized by operating a “main hook lowering” button, to ensure that the transported mate- rial is lowered to the ground safely, and the electromagnet may continue being used after the external line of the power grid is energized.

Wiring:

External wiring of the control apparatus shall use wires or cables with a withstand voltage over 500 V. According to a laying environment of the wires or cables and corresponding to an exter- nal wiring diagram, wires with an appropriate area are selected in consideration of a certain allowance, thereby avoiding misconnec- tion. Wires led into the control apparatus should be fastened to wiring terminals.

A control panel: the control panel of the electromagnetic chuck is mounted in the cab of the overhead crane.

A development test: a test process and a test solution are organized first to show how to test, and then test steps and re- quirements, tests in different environments at different time, test intensity, and test times shall be subdivided, to generate a test report, so as to show rigor of development. Gantry crane as- sembly: the floor type 40T double-beam gantry crane with the span of 30 m, an effective cantilever length of 7.5 m on each of two sides, and a hoisting height of 12.66 m is assembled. Power of a hoisting brake: 2*main hook/400 W; and power of a travelling elec- tric motor of the trolley is 2*7.5 KW.

Category of goods to be attracted and hoisted and relevant test requirements: (1) The deformed steel bar has a bundle diameter ¢ of 300 mm, and a length of 9 m-12 m; and a dead weight is no more than 3 t/bundle, and 5 bundles of deformed steel bars are hoisted each time, running in parallel. (2) The H-shaped steel: a bundled profile has a width of 600 mm and a height of 400 mm; and one bundle of H-shaped steel has a weight of about 6 t, and a length of 12 m, and 3 bundles of H- shaped steel are hoisted each time, running in parallel. (3) A coiled rebar has a diameter of 1.2 m-1.3 m, a length of 1.3 m-1.6 m, and a weight of 2.2 t-2.5 t.

Sizes of a train compartment: a big train has a height of 3.5 m, and a compartment of the big train has a width of 2.7 m. (5) The chuck electromagnetic hanging beam may be mounted on the floor type 40T double-beam gantry crane with the span of 30 m, and has functions of magnetic latching in power off, and lowering the main hook when the apparatus fails and the power is cut off, and making the travelling trolley move left and right through in- version. (6) When working normally, the electromagnetic hoist may at- tract and transport a workpiece of a demander effectively, and run smoothly, without influencing steel and related apparatuses adja- cent thereto. (7) The electromagnetic hoist designed according to a field survey may hoist the H-shaped steel in bulk technically, and at- tract and hoist the deformed steel bars, H-shaped steel, steel sheet, etc. having a length of 12 m in bundle, and ensures smooth running. (8) The configured intelligent electromagnetic hoist has uni- form magnetic force distribution on a magnetic pole face. (9) Power-off protection: power-off protection for over 30 min during operation is satisfied. (10) Use environment: the intelligent electromagnetic hoist employs an advanced domestic structural design, and may be used in various environments, and operate outdoors at the minimum tempera- ture of -20° and the maximum temperature of 50°. (11) The external power line is protected by a protective housing, so as to achieve a protection effect.

The present invention has the beneficial effects as follows: 1. The electromagnetic hanging beam of the electromagnetic hoist is mounted on the floor type 40T double-beam gantry crane with the span of 30 m, and has the functions of magnetic latching in power off, and lowering the main hook when the apparatus fails and the power is cut off, and making the travelling trolley move left and right through the inversion, thereby ensuring that the transported material is lowered to the ground safely. 2. The electromagnetic hoist employs the advanced domestic structural design, divides the electromagnet into two parts, em- ploys the double-wire packet sub-control mode, uses the electrical pure iron as the main magnetism conduction material, features the short magnetization and demagnetization time, and the high, uni- form, and stable magnetic field intensity, and facilitates the magnetism adjustment. The soft electrical pure iron does not tend to damage the surface of the steel sheet. The electromagnet has the uniform magnetic force distribution on the magnetic pole face.

The electromagnetic hoist may be used in various environments. 3. The electromagnetic hoist may hoist the H-shaped steel in bulk, and attract and hoist the deformed steel bars, H-shaped steel, and steel sheets, etc. having the length of 12 m in bundle technically, and ensure the effective attractive transport and smooth running. 4. The control system of the electromagnetic hoist features no contact and the high reliability. Currently, silicon controlled rectifier elements have been widely used in various industrial en- vironments. The present electrical control system employs the sil- icon controlled rectifier technology combined with the highly- reliable Siemens PLC, of which the main circuit is the system sim- ilar to the logic non-lcop reversible system. The forward and re- verse silicon controlled rectifiers of the system are both inter- locked through the PLC program control. The system features the high reliability and the high control precision. The electrical control system has the perfect monitoring and protection measures.

The fault signals, the electromagnet selection signals, etc. are all sent into the PLC for the flexible control. 5. The electromagnetic hoist employs the power inversion technology, to ensure the running safety. The special interference resistance measures of the power ensure that the system has the highly-reliable interference resistance and running reliability in the environment of the overhead crane. 6. The charge part of the electromagnetic hoist is upgraded and updated. The automatic charge panel has been upgraded to the fourth generation automatic charge control panel so far, where the automatic charge panel is composed of the step-down rectifier transformer (integrated with the rectifier transformer), the syn- chronous transformer TR2, the three-phase rectifier module, and one set of automatic contrel circuits. The constant charge, float- ing charge, automatic tracking, automatic adjustment, and automat- ic switching are realized. 7. The electromagnetic hoist employs the GTBM-UPS-15KW-series inverter control apparatus. When the direct current power is re- quired to be inverted into the alternating current power after the power is cut off, the GTBM-UPS-15KW inverter control apparatus is mainly used for lowering the main hook, and another GTBM-UPS-15KW inverter control apparatus is configured for the trolley to travel left and right, so as to ensure the safety of the transported ma-

terial, people and apparatus. 8. The electromagnetic hoist of the present invention fea- tures strong and uniform attractive force of the chuck, safety, energy conservation, simple operation, good shock resistance, and high precision. The strong attractive force up to 16 kg/cm” that is not attenuated over time may be generated. Magnetic force lines are uniformly distributed in an entire area where a mold makes contact with the chuck, an action depth of the magnetic force is within 16 mm, and the magnetic force lines will not penetrate a surface of the workpiece to be machined, or magnetize a tool and spindle of a machine tool, not influencing machining precision and chip removal. In addition, the power is only used within 0.6 s-3 s by which the workpiece is clamped or released, the workpiece is attracted by means of a permanent magnetic force in a clamping state, and a magnetic disk is in a completely-uncharged running state, so that the danger of workpiece movement and falling in the case of sudden power off or damage of a connection cable is avoid- ed. Compared with a common electromagnetic hoist, over 95% energy is saved on, and almost no operating cost is caused. In view of mechanical structures, all contact points between the workpiece and the chuck or a magnetic conduction block of the electromagnet- ic hoist are all supporting points and clamping points, so that clamping is more stable, rigidity and the shock resistance are better, and service life may be prolonged by over 303. Under the action of automatic leveling, the clamped material will not gener- ate internal stress or clamping deformation, and after transport, the material will not rebound or deform, so that the precision is higher. A clamping force of Italian “Tecnomagnete”of only 15 kg/cm? is applied to the entire contact surface. The product produced by the present invention gradually replaces an Italian “Tecnomag- nete”product, and is more competitive than an imported product in cost.

BRIEF DESCRIPTION OF THE DRAWINGS

Other features, objectives, and advantages of the present ap- plication will become more apparent by reading the detailed de- scription on non-limiting embodiments made with reference to the following accompanying drawings:

FIG. 1 is a front view of eight jointly-hung electromagnets;

FIG. 2 is a side view of eight jointly-hung electromagnets;

FIG. 3 is a front view of four jointly-hung electromagnets; and

FIG. 4 is a side view of four jointly-hung electromagnets.

DETAILED DESCRIPTION OF THE EMBODIMENTS

The present application will be further described in detail below with reference to the accompanying drawings and the embodi- ments. It may be understood that the specific embodiments de- scribed herein are merely used to explain the related invention, rather than limit the present invention. In addition, it should also be noted that only parts related to the invention are shown in the accompanying drawings for ease of description.

It should be noted that the embodiments in the present appli- cation and features in the embodiments may be combined with one another without conflict. The present application will be de- scribed in detail below with reference to the accompanying draw- ings and the embodiments.

Embodiment 1: An intelligent electromagnetic hoist includes electromagnets 4, where the electromagnet 4 is connected to an electromagnetic hanging beam 2 through a chain 3, the electromag- netic hanging beam 2 is connected to a double-beam gantry crane 1, a control system controls rising and falling of an entire electro- magnetic hoist, four or eight electromagnets are jointly hung on the electromagnetic hanging beam through chains, an electromagnet- ic chuck has a size<1600 mm*800 mm, and the electromagnetic hoist has a magnetization and demagnetization time<4 s, and a demagneti- zation timeS3 s.

In the present embodiment, the electromagnetic hanging beam of the electromagnetic hoist may be mounted on a floor type 40T double-beam gantry crane with a span of 30 m, and has functions of magnetic latching in power off, and lowering a main hook when an apparatus fails and power is cut off.

In the present embodiment, the electromagnetic hoist divides the electromagnet into two parts, employs a double-wire packet sub-control mode, and uses electrical pure iron as a main mag- netism conduction material.

In the present embodiment, the electromagnetic hoist may hoist H-shaped steel in bulk, and attract and hoist deformed steel bars, H-shaped steel, and steel sheets with a length of 12 m in bundle, and ensures effective attractive transport and smooth run- ning.

In the present embodiment, the control system of the electro- magnetic hoist features no contact and high reliability, with a silicon controlled rectifier (SCR) technology employed.

In the present embodiment, the electromagnetic hoist employs a power inversion technology.

In the present embodiment, the electromagnetic hoist has the fourth generation automatic charge control panel as a charge part, where an automatic charge panel is composed of a step-down recti- fier transformer, a synchronous transformer TR2, a three-phase rectifier module, and a set of automatic control circuits.

In the present embodiment, a GTBM-UPS-15KW-series inverter control apparatus is selected as the control system of the elec- tromagnetic hoist.

An electromagnetic hoist form: the electromagnetic hoist with four electromagnets used in combination is employed, and the elec- tromagnets are connected to the electromagnetic hanging beam through the chains.

The electromagnetic hoist has the magnetization and demagnet- ization time<£4 s, and the demagnetization time<3 s.

An insulation material has a heat-resistant grade up to C.

A surface of a housing of the electromagnet is subjected to shot blasting treatment, and polished smooth without burr. A sur-

face of a housing with sharp edges is coated with two layers of primer and two layers of finish paint. A surface of an electromag- netic chuck is coated with a safety sign.

The control system of the electromagnet employs the silicon controlled rectifier technology combined with a programmable logic controller (PLC), of which a main circuit is a system similar to a logic non-loop reversible system. Forward and reverse silicon con- trolled rectifiers of the system are both interlocked through PLC program control. During material attraction, the forward silicon controlled rectifier is connected, and the reverse silicon con- trolled rectifier is locked. During material releasing, the for- ward silicon controlled rectifier is first controlled to shift a phase to an inversion state, and energy of the electromagnet is fed back to a power grid. In addition, some energy is absorbed by de-excitation resistors FDR3 and V2. After a forward current be- comes 0, the forward silicon controlled rectifier is disconnected, and after a delay of 1.5 s, the reverse silicon controlled recti- fier is triggered to be connected, and a reverse demagnetization voltage is applied to the electromagnet. A time for applying the reverse demagnetization voltage is adjusted through a time relay in a central processing unit CPU of 87-200. After the reverse voltage stops demagnetizing, reverse demagnetization energy is rapidly consumed in the resistors FDR3 and V2, and disconnection of the reverse SCR is accelerated, so that an operation frequency is increased, and an entire electrical control system is advanced technically, precise, and reliable. According to the present sys- tem, the control mode features good softness, expansibility, and flexibility, and an entire device features good interference re- sistance, a wide phase shift range, a few external elements, sim- ple and convenient mounting and adjustment, and reliable use.

Perfect monitoring and protection measures:

The electrical control system has the perfect monitoring and protection measures. The system is protected against short cir- cuit, phase loss, an undervoltage, voltage loss, an overvoltage,

etc. The system further has incoming power monitoring, module fast fuse protection, alternating current side varistor overvoltage protection, direct current side resistance-capacitance absorption, etc. A voltage and a current of the system enter the PLC for fault diagnosis through a transmitter, to ensure a reliable input of a magnetic latching system when the system fails, thereby avoiding major personal and apparatus accidents such as material falling, and the perfect system monitoring and protection measures ensure reliable running of the system reliably. When the control system is designed, fault signals, electromagnet selection signals, etc. are all sent into the PLC, which is conducive to flexible control.

Employing the power inversion technology to ensure running safety:

When the power is cut off in a running process of attracting a material by the electromagnet, the magnetic latching system car- ries out magnetic latching automatically. When an overhead crane runs to a safe and open position, the system employs the power in- version technology, to invert power of a battery, and supplies in- verted power to a hoisting band-type brake electric motor of the crane, an alternating current electric motor is turned on to lower the attracted material slowly, and a trolley travels left and right, to ensure safety of people and the apparatus.

Employing special interference resistance measures for power

Generally, power of an excitation and magnetic latching sys- tem is sourced from an isolated conductor rail of the crane. The power features numerous harmonic components and a large waveform distortion. The system tends to generate heat, and the control system tends to be interfered, resulting in failure or misopera- tion. In order to ensure system stability and a reliable magnetic latching action without material falling in a failure, the product of the present invention employs a plurality of special interfer- ence resistance measures. An incoming power line is added with a rectifier transformer in delta connection, a main loop is added with a resistance-capacitance absorber and a three-phase power filter, independent DC 24 V switch power is employed to ensure that in an environment of the overhead crane, the system has high- ly-reliable interference resistance and running reliability.

Upgrading and updating the charge part:

The automatic charge panel has been upgraded to the fourth generation automatic charge control panel so far, where the auto- matic charge panel is composed of the step-down rectifier trans- former, the synchronous transformer TR2, the three-phase rectifier module, and one set of automatic control circuits. Constant charge, floating charge, automatic tracking, automatic adjustment, and automatic switching are realized. YC-ACCB is a trigger pulse forming circuit board, which controls rectification of a three- phase half-controlled rectifier module. JI-1 and J1-2 are current feedback signals, and J1-2 and J1-3 are voltage feedback signals, to ensure that output direct current power is constant voltage current limiting power, so as to satisfy requirements of charging the battery. Overvoltage detection is realized through a Hall ele- ment sensor, and a pointer voltmeter and an ammeter are arranged in a meter box of a cab, to display a voltage of the battery and a charge current.

An electrical control device: input power: AC 380 V 50 Hz, three-phase; output voltage: DC 220 V; output current: 200 A; pro- tection grade: IP54 sub-control mode: the electromagnetic chuck is required to have a sub-control capacity, and an excitation and de- magnetization time<3 s. It is required to have functions of un- dervoltage protection, short-circuit protection, overvoltage pro- tection, misoperation protection, protection and alarm in the case of open circuit of an excitation switch of the electromagnetic chuck, etc., and to describe the functions in detail. It is also required to have a function of inversion; the main loop is re- quired to have no contact; and an excitation circuit is controlled by Siemens 37-226 or S7-224. A contactless module employs a sili- con controlled rectifier, and an energy feedback module employs an insulated gate bipolar transistor (IGBT).

The GTBM-UPS-15KW-series inverter control apparatus:

UPS-15KW-series inverter control apparatus is additionally config- ured for the trolley to travel left and right. Currently, direct current power of a storage battery is inverted into 3¢ 50 Hz 380 V alternating current power through an inverter. When power of an external line of the power grid is cut off suddenly in a process of attracting the material by the electromagnet, an alternating current band-type brake of a winch may be energized by operating a “main hook lowering” button, to ensure that the transported mate- rial is lowered to the ground safely, and the electromagnet may continue being used after the external line of the power grid is energized.

Wiring:

A development test: a test process and a test solution are organized first to show how to test, and then test steps and re- quirements, tests in different environments at different time, test intensity, and test times shall be subdivided, to generate a test report, so as to show rigor of development.

Gantry crane assembly: the floor type 40T double-beam gantry crane with the span of 30 m, an effective cantilever length of 7.5 m on each of two sides, and a hoisting height of 12.66 m is assem- bled. Power of a hoisting brake: 2*main hook/400 W; and power of a travelling electric motor of the trolley is 2*7.5 KW.

Category of goods to be attracted and hoisted and relevant test requirements: {1) The deformed steel bar has a bundle diameter ¢ of 300 mm, and a length of 9 m-12 m; and a dead weight is no more than 3 t/bundle, and 5 bundles of deformed steel bars are hoisted each time, running in parallel. (2) The H-shaped steel: a bundled profile has a width of 600 mm and a height of 400 mm; and one bundle of H-shaped steel has a weight of about 6 t, and a length of 12 m, and 3 bundles of H- shaped steel are hoisted each time, running in parallel. (3) A coiled rebar has a diameter of 1.2 m-1.3 m, a length of 1.3 m-1.6 m, and a weight of 2.2 t-2.5 t.

Sizes of a train compartment: a big train has a height of 3.5 m, and a compartment of the big train has a width of 2.7 m. (5) The chuck electromagnetic hanging beam may be mounted on the floor type 40T double-beam gantry crane with the span of 30 m, and has the functions of magnetic latching in power off, and low- ering the main hook when the apparatus fails and the power is cut off, and making the travelling trolley move left and right through inversion. {6) When working normally, the electromagnetic hoist may at- tract and transport a workpiece of a demander effectively, and run smoothly, without influencing steel and related apparatuses adja- cent thereto. {7) The electromagnetic hoist designed according to a field survey may hoist the H-shaped steel in bulk technically, and at- tract and hoist the deformed steel bars, H-shaped steel, steel sheet, etc. having a length of 12 m in bundle, and ensures smooth running. (8) The configured intelligent electromagnetic hoist has uni- form magnetic force distribution on a magnetic pole face. (9) Power-off protection: power-off protection for over 30 min during operation is satisfied. (10) Use environment: the intelligent electromagnetic hoist employs an advanced domestic structural design, and may be used in various environments, and operate outdoors at the minimum tempera- ture of -20° and the maximum temperature of 50°. (11) The external power line is protected by a protective housing, so as to achieve a protection effect.

Significant indicators © Model of electromagnetic hoist:MW38-16080L/1 2) Size of electromagnetic hoist:1600*800 mm 3 dead weight of electromagnetic hoist:2300 KG (approximate) (2) Power conditions: input 380 V+10%, output 220 V+10%, 50

HZ+1% (5) Power-off magnetic latching time:230 min (6) Size of balance beam:<9 m 2) Cold state power: output 12 KW

Cold state current: output 54 A 3) Rated voltage: DC 220 V

Energization duration rate: E.D.=75% an Attractive force safety factor:kf22.5 2) Protection grade:IP65, insulation grade: H 13 A power inverter is configured. In the case that main pow- er of the gantry crane is cut off, the inverter inverts the direct current power into 380 V alternating current power for lowering the main hook of the gantry crane.

The four or eight electromagnets are jointly hung, and the electromagnetic chuck has the size S1600mm*800mm.

Capable of transporting high-speed wire rods and the deformed steel bars and section steel in bundle, hoisting several Capable of transporting 2 Material transport flat slabs and the container, integrating a | separately, and non- plurality of functions, and realizing intel- | intelligent ligent hoisting of a plurality of materials with the same electromagnet

Safety, high efficiency, flexibility, and controllability, and capable of ensuring Safety, controllability, low 3 Safety the safety of the transported material as | efficiency, and inflexibility

High reliability and control

High reliability, control precision, and precision, no interference interference resistance, and capable of resistance, and incapable

Reliability and intelli- 4 automatic charge, automatic tracking, of automatic charge, au- gent control automatic adjustment, and automatic tomatic tracking, automat- switching ic adjustment, and auto- matic switching nance tection measures, and suitable for vari- ing and protection ous environments measures, and not suitable for various environments

What is described above is merely illustrative of the pre- ferred embodiments of the present application and the technical principles applied. It should be understood by those skilled in the art that the scope of the invention referred to in the present application is not limited to the technical solutions that are formed by combining the technical features described above with one another specifically, and should also encompass other tech- nical solutions that are formed by combining the technical fea- tures described above or equivalents thereof with one another ran- domly without departing from the inventive concept. For example, the technical solutions formed by interchanging the features de- scribed above and the technical features, having similar func- tions, disclosed in the present application (but not limited thereto).

Except for the technical features described in the descrip- tion, other technical features that are known to those skilled in the art are not described in detail herein, so as to highlight the inventive features of the present invention.

Claims

CONCLUSIESCONCLUSIONS

1. Intelligente elektromagnetische takel, omvattende elektromagne- ten, waarbij de elektromagneet via een ketting is verbonden met een elektromagnetische ophangbalk, de elektromagnetische ophang- balk is verbonden met een dubbelligger portaalkraan, een bestu- ringssysteem het stijgen en dalen regelt van een volledige elek- tromagnetische takel, waarbij vier of acht elektromagneten geza- menlijk door middel van kettingen aan de elektromagnetische op- hangbalk worden opgehangen, waarbij een elektromagnetische klauw- plaat heeft een afmeting van S1600 mm * 800 mm, en de elektromag- netische takel heeft een magnetisatie- en demagnetisatietijd <4 s en een demagnetisatietijd £3 s.1. Intelligent electromagnetic hoist, comprising electromagnets, in which the electromagnet is connected to an electromagnetic suspension beam through a chain, the electromagnetic suspension beam is connected to a double girder gantry crane, a control system controls the rise and fall of a full electric electromagnetic hoist, in which four or eight electromagnets are jointly suspended from the electromagnetic suspension beam by chains, in which an electromagnetic chuck has a size of S1600mm * 800mm, and the electromagnetic hoist has a magnetization and a demagnetization time <4 s and a demagnetization time £3 s.

2. Intelligente elektromagnetische takel volgens conclusie 1, waarbij de elektromagnetische ophangbalk van de elektromagnetische takel kan worden gemonteerd op een 40T dubbelligger portaalkraan van het vloertype met een spanwijdte van 30 m, en functies heeft van magnetische vergrendeling bij uitschakelen, en het neerlaten van een hoofdhaak wanneer een apparaat uitvalt en de stroom uit- valt.The intelligent electromagnetic hoist according to claim 1, wherein the electromagnetic suspension beam of the electromagnetic hoist can be mounted on a 40T double girder floor type gantry crane with a span of 30m, and has functions of magnetic locking when power off, and main hook lowering when a device fails and the power goes out.

3. Intelligente elektromagnetische takel volgens conclusie 1, waarbij de elektromagneet in twee delen is verdeeld, waarbij ge- bruik wordt gemaakt van een dubbeldraads pakket- subbesturingsmodus, en elektrisch zuiver ijzer wordt gebruikt als een hoofd magnetisme geleidend materiaal.The intelligent electromagnetic hoist according to claim 1, wherein the electromagnet is divided into two parts, using a double-wire packet sub-control mode, and electrically pure iron is used as a main magnetism conductive material.

4. Intelligente elektromagnetische takel volgens conclusie 1, die in staat is om H-vormig staal in bulk te hijsen, en om vervormde stalen staven, H-vormig staal en staalplaten met een lengte van 12 m in een bundel technisch aan te trekken en te hijsen, en om er- voor te zorgen dat een effectieve aantrekkelijk transport en een vlotte werking wordt verkregen.The intelligent electromagnetic hoist according to claim 1, which is able to lift H-shaped steel in bulk, and to technically attract and pull deformed steel bars, H-shaped steel and steel plates with a length of 12 m in a bundle. lifting, and to ensure that effective attractive transport and smooth operation is obtained.

5. Intelligente elektromagnetische takel volgens conclusie 1,The intelligent electromagnetic hoist according to claim 1,

waarbij het besturingssysteem van de elektromagnetische takel geen contact heeft en een hoge betrouwbaarheid heeft, onder toepassing van een siliciumgestuurde gelijkrichtertechnologie.wherein the control system of the electromagnetic hoist has no contact and high reliability, adopting silicon controlled rectifier technology.

6. Intelligente elektromagnetische takel volgens conclusie 1, waarbij gebruik wordt gemaakt van een vermogensinversietechnolo-The intelligent electromagnetic hoist according to claim 1, using a power inversion technology

gie.gie.

7. Intelligente elektromagnetische takel volgens conclusie 1, met het automatische laadcontrolepaneel van de vierde generatie als laadgedeelte, waarbij het automatische laadpaneel is samengesteld uit een step-down gelijkrichtertransformator, een synchrone trans- formator TR2, een driefasige gelijkrichtermodule, en een set van automatische regelcircuits.The intelligent electromagnetic hoist according to claim 1, having the fourth generation automatic loading control panel as the loading part, wherein the automatic loading panel is composed of a step-down rectifier transformer, a synchronous transformer TR2, a three-phase rectifier module, and a set of automatic control circuits .

8. Intelligente elektromagnetische takel volgens conclusie 1, waarbij een GTBM-UPS-15KW-serie gelijkrichterbesturingsapparaat is geselecteerd als het besturingssysteem van de elektromagnetische takel.The intelligent electromagnetic hoist according to claim 1, wherein a GTBM-UPS-15KW series rectifier control device is selected as the control system of the electromagnetic hoist.