CN203237963U - Electric hoist adopting frequency conversion technology and capable of being used in single-phase power source - Google Patents
Electric hoist adopting frequency conversion technology and capable of being used in single-phase power source Download PDFInfo
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- CN203237963U CN203237963U CN 201320237706 CN201320237706U CN203237963U CN 203237963 U CN203237963 U CN 203237963U CN 201320237706 CN201320237706 CN 201320237706 CN 201320237706 U CN201320237706 U CN 201320237706U CN 203237963 U CN203237963 U CN 203237963U
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Abstract
The utility model discloses an electric hoist adopting a frequency conversion technology and capable of being used in a single-phase power source. The electric hoist comprises a main machine, a control handle is arranged on one side of the main machine, a lifting special frequency converter control cabinet is arranged on the other side of the main machine, and a frequency converter is arranged in the lifting special frequency converter control cabinet. A major loop of the frequency converter comprises a rectifying circuit, a capacitor circuit and an inverter circuit. By means of the frequency conversion technology, the power source processed by the frequency converter is output to a main circuit of the electric hoist in a three-phase electricity mode so as to control ascending and descending of the electric hoist, a brake resistor specially coordinated with the frequency converter is internally arranged in an electric hoist control cabinet, heat is dissipated through a shell of the electric hoist, in addition, voltage remains constant in the process, and therefore the electric hoist can be conveniently used in various specifications of electric chain hoists and various occasions without three-phase power sources and can also be used in other hoisting devices with similar functions. The electric hoist has the advantages of being excellent in practicality, novel in design and great in marketing popularization prospect, and is a good novelty scheme.
Description
Technical field
The utility model relates to small-sized weight-lifting equipment field, particularly relates to a kind of employing converter technique, can be used for the electric block of single phase poaer supply occasion.
Background technology
As small-sized weight-lifting equipment, electric block is divided into steel-wire rope type electric block and Electric Chain Blocks, wherein Electric Chain Blocks is attractive in appearance with fuselage appearance, volume is little, the lifting downslide amount is little, the characteristics such as control is accurate, degree of protection is high, noise is little, safe and reliable that descend that hoist, and the industries such as transportation, chemical industry, shipbuilding, Mould Machining, metal surface treatment are widely used in storing in a warehouse.In China's all trades and professions, Electric Chain Blocks uses the field more and more extensive, but, also only limit to use at present the occasion of industrial three phase mains at Electric Chain Blocks, in the situation that a lot of reality more particularly do not possess the next three phase mains electric block that can't use of three phase mains environment for use such as storage, market, hospital, family etc.
The industrial power supply major part is three-phase electricity, can drive very easily various threephase asynchronous machines, some midget plants then wish to adopt single phase power supply, this moment, electric motor starting and speed governing meeting were cumbersome, two kinds of common solutions are that monophase machine adds the electric capacity startup and single-phase frequency converter adds three phase electric machine, the below does simple an introduction and contrast with regard to two kinds of methods, single-phase AC motor only has a winding, rotor is squirrel-cage, when single-phase sinusoidal current passes through stator winding, electrical motor will produce an alternating magnetic field, the power in this magnetic field and direction at any time intercropping sine gauge rule change, but fix at dimensional orientation, so claim that again this magnetic field is the alternation pulsating magnetic field, this alternation pulsating magnetic field can be decomposed into two with same rotational speed, hand of rotation is opposite rotating field each other, these two rotating fields produce two equal and opposite in directions in rotor when stationary rotor, the torque of opposite direction, so that synthetic torque is zero, so electrical motor can't rotate, when we make electrical motor rotate to a direction with external force, rotate such as clockwise direction, at this moment the cutting magnetic line movement between the rotating field of rotor and dextrorotation veer diminishes, it is large that cutting magnetic line movement between the rotating field of rotor and left-hand revolution direction becomes, balance has just been broken like this, total electromagnetic torque that rotor produces will no longer be zero, rotor will rotate along pushing direction, make single-phase electric function automatic rotation, we can add a starting winding in stator, starting winding and main winding spatially differ 90 degree, the starting winding will be connected in series a suitable electric capacity, so that with the electric current of main winding at approximate 90 degree that differ of phase place, be so-called minute facies principle, such two electric currents that differ in time 90 degree pass into two windings that spatially differ 90 degree, will spatially produce the two-phase rotating field, under this rotating field effect, rotor just can start automatically, when treating after the starting that rotating speed is raised to a certain degree, be installed in epitrochanterian centrifugal switch or other automatic control devices by means of one and will start winding and disconnect, only have main winding work during normal operation.
But, many times starting winding does not disconnect, we claim that this electrical motor is capacitor motor, change turning to of this electrical motor, can be realized by the position that changes capacitor series, than industrial three phase electric machine commonly used, use monophase machine that following shortcoming is arranged, first, with the comparison of power motor, monophase machine is higher than three phase electric machine price, the volume ratio three phase electric machine is large, and second, lifting belongs to potential energy loading high, larger detent torque need to be arranged, do not slip hook aloft when guarantee promotes, and the monophase machine detent torque is little, being not suitable as bridge motor uses, do not meet the demands, the 3rd, three phase electric machine is easy to realize the control of rotating, stop first fixed could the conversion and single-phase electricity is confidential, the 4th, monophase machine relies on electric capacity to realize the control of rotating, is easily starting or the operation phase forms the impact of large electric current, easily burn out motor, damage electric capacity and cable.Therefore, monophase machine can not satisfy the torque characteristics demand when starting, and can not satisfy the process requirements of frequent rotating, is not suitable for doing and reuses, and Practical Performance is not good, so exist deficiency.
In sum, for the defective of prior art, need especially a kind of electric block that adopts converter technique can be used in single phase poaer supply, to solve the deficiencies in the prior art.
The utility model content
For in the prior art there is limitation in single phase poaer supply in electric block uses, and in the use procedure of reality, make a big impact, the utility model proposes a kind of electric block that adopts converter technique can be used in single phase poaer supply, rectifier bridge by frequency converter, electric current is become direct current, the frequency and the adjustable sinusoidal waveform of voltage that need by Converting Unit input motor again, by Winding Single Phase Capacitance to frequency converter, drive a common threephase asynchronous machine, thereby realize the control to asynchronous motor, address the deficiencies of the prior art.
To achieve these goals, the technical solution of the utility model is as follows:
A kind of electric block that adopts converter technique can be used in single phase poaer supply, comprise main frame, one side of main frame is equipped with control handle, the opposite side of main frame is provided with lifting special converter control box, lifting special converter control box inside is provided with frequency converter, and the major loop of frequency converter includes rectifying circuit, condenser network, inverter circuit; Single-phase voltage carries out rectification by diode VD1, diode VD2, diode VD3, diode VD4 to simple phase current by the single phase poaer supply interface and forms rectifying circuit, the current delivery that rectifying circuit will be processed is given the condenser network that is carried out the electric charge storage by electric capacity Ec, condenser network forms inverter circuit by three groups of one-way electric powers that insulated gate bipolar transistor IGBT distributes above, three groups of one-way electric powers above the inverter circuit form the three phase mains interface, and the three phase mains interface connects motor.
Dispose accordingly braking resistor according to power of motor in the utility model electric block electric cabinet, surface one end of control handle is provided with operation push-button, and the other end of control handle is provided with scram button.
Further, described main frame connects the chain bag, and chain bag inside is equipped with load chain, and the below of load chain is provided with limit spring.
Upper end at load chain described in the utility model is equipped with hook, and the lower end of load chain is equipped with lower suspension hook, hook and the lower safety tongue that is provided with above the suspension hook.
The beneficial effects of the utility model are: this product structure is simple, easy to make, by adopting converter technique, the power supply that to process through frequency converter is with the formal output of the three-phase electricity power circuit to electric block, control hoisting and descending of electric block, the braking resistor of the special adapted of frequency converter is built in the electric block control box, by electric block shell distribute heat, and voltage remains unchanged in this process, can be used in easily the Electric Chain Blocks product of various models and various without in the three phase mains occasion, also can be used on the weight-lifting equipment of other similar functions, Practical Performance is excellent, uses flexibly modern design, be a kind of good innovation scheme, the marketing prospect is arranged very much.
Description of drawings
Describe the utility model in detail below in conjunction with the drawings and specific embodiments:
Fig. 1 is the electrical block diagram of frequency converter in the utility model.
Fig. 2 is the topological diagram that the utility model frequency converter connects.
Fig. 3 is Facad structure schematic diagram of the present utility model.
Fig. 4 is construction profile schematic diagram of the present utility model.
100-main frame among the figure, 110-chain bag, 120-control handle, 130-limit spring, 140-hook, suspension hook under the 150-, the 160-load chain, the 170-safety tongue, 180-braking resistor, 190-lifting special converter control box, 111-single phase poaer supply interface, the 300-frequency converter, 112-three phase mains interface, 310-motor.
The specific embodiment
For technological means, creation characteristic that the utility model is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the utility model.
Referring to Fig. 1, Fig. 2, a kind of electric block that adopts converter technique can be used in single phase poaer supply of Fig. 3, Fig. 4, comprise main frame 100, one side of main frame 100 is equipped with control handle 120, the opposite side of main frame 100 is provided with lifting special converter control box 190, lifting special converter control box 190 inside are provided with frequency converter 300, and the major loop of frequency converter 300 includes rectifying circuit, condenser network, inverter circuit; Single-phase voltage passes through single phase poaer supply interface 111 by diode VD1, diode VD2, diode VD3, diode VD4 carries out rectification and forms rectifying circuit simple phase current, the current delivery that rectifying circuit will be processed is given the condenser network that is carried out the electric charge storage by electric capacity Ec, condenser network forms inverter circuit by three groups of one-way electric powers that insulated gate bipolar transistor IGBT distributes above, three groups of one-way electric powers above the inverter circuit form three phase mains interface 112, three phase mains interface 112 connects motor 310, be used for Motor Driven Elevating Calabash load-carrying load, the electric block of single phase poaer supply is when disposing motor-driven carrier, the power supply principle is same such as the electric block that the employing converter technique can be used in single phase poaer supply, also corresponding in addition arrangement brake resistance.
In addition, control handle 120 1 ends are equipped with braking resistor 180, and surface one end of control handle 120 is provided with operation push-button, and the other end of control handle is provided with scram button.Main frame 100 connects chain bag 110, and chain bag 110 inside are equipped with load chain 160, and the below of load chain 160 is provided with limit spring 130.The upper end of load chain 160 is equipped with hook 140, and the lower end of load chain 160 is equipped with lower suspension hook 150, hook 140 and be provided with safety tongue 170 above the lower suspension hook 150.The shape of limit spring 130 twist.
Single phase poaer supply is connected and installed in L end and the R end of the frequency converter 300 in the control box for frequency converter 190 by electric power incoming line one end of electric block, the power supply of processing through frequency converter 300 is with the formal output of the three-phase electricity power circuit to electric block main frame 100, hoisting and descend by electric block control circuit control electric block, voltage remains unchanged in this process, the braking resistor 180 of the special adapted of its frequency converter is built in the electric block control box, by electric block shell distribute heat.
Principle of work of the present utility model is: the principle of work of frequency converter is rectification, inversion, no matter be single phase poaer supply or three phase mains, the capital is by the rectifier bridge of frequency converter, become direct current, be input as frequency and the adjustable sinusoidal waveform of voltage that motor needs by Converting Unit again, namely by single phase power supply to frequency converter, drive a common threephase asynchronous machine.At first, frequency converter can be transformed to direct current (DC) (DC) to single phase alternating current, and then direct current (DC) (DC) is transformed to three-phase or alternating current (AC), and then drives a threephase asynchronous machine.Secondly, frequency converter can realize that vector controlled is with the stator current Ia of asynchronous motor under three phase coordinate systems, Ib, Ic, by three-phase-two phase inversion, equivalence becomes the alternating current Ia1 under the two-phase rest frame, Ib1, again by pressing rotor field-oriented rotation transformation, equivalence becomes the DC current Im1 under the synchronous rotating frame, It1, Im1 is equivalent to the exciting current of DC motor, It1 is equivalent to the armature current that is directly proportional with torque, then imitate the control method of DC motor, try to achieve the controlling quantity of DC motor, through corresponding coordinate inverse transform, realize the control to asynchronous motor.Its essence is the alternating-current motor/AC motor equivalence is DC motor, respectively speed, two components in magnetic field are carried out independent control, open loop control in closed loop control, can reach the full torque of zero-speed, in the situation that also can be issued in the situation of 0.5Hz 150% torque.Therefore, be particularly suitable for being applied on the weight-lifting equipment.The lifting special converter is vector controlled, is widely used on the various weight-lifting equipments, and principal feature and performance figure are:
1, speed-regulating range width can be realized the operation of accurate control positioning requirements, and the speed governing open loop is than being 1:100, and closed loop can reach 1:1000.
2, detent torque is large, and for the large detent torque demand of weight-lifting equipment, frequency converter can reach 150% rated current 60s; 180% rated current 10s easily satisfies the working condition requirement that hoists, and with the drg no-float, braking glide quantity is controlled in the scope of national Specification.
Not only can realize permanent torque speed downward modulation, convenient at a slow speed contraposition, but also can realize that permanent power speed raises, the realization underloading is moved fast, and is favourable for enhancing productivity.The output voltage self adaptation; applicable area is wide; during input voltage fluctuation, the auto-compensation output voltage also has enough staring torques when voltage is low; low especially or when cutting off the power supply suddenly at voltage; by reducing output frequency, the energy that produces when using mechanism's braking is kept the enough moment of a short time; after the drg braking, shut down again, guarantee that braking glide quantity is controlled in the scope of national Specification.The lifting mechanism of electric block leaves or the kiss the earth momentary load changes violent at hoisting heavy, the frequency converter moment responses is fast, when load weight changes, can in time adjust the output torque, this impact load is smoothly controlled, all the time guarantee given speed, process is accurately controlled, and dynamic characteristics is good.The input/output terminals free function is set, and parameter arranges rationally, and field adjustable is simple, and trouble diagnosing and maintenance are convenient in the safety when control loop power supply and main circuit power can be controlled respectively the raising user and debug.Dangerous speed monitors, stops fast and the running velocity of overspeed protection frequency converter Real-Time Monitoring motor; when motor speed during greater than the highest permissible velocity of setting or velocity deviation value; frequency converter sends fault alarm and stops immediately output; the mechanical brake action is used electric block and is in a safe condition.
Monophase machine mainly is applicable to some to the less demanding blower fan of detent torque, pump-type load, and motor cost is high, volume is large and startup, rotating control are dumb, and lifting occasion fault rate is high and dangerous.And the AC-DC of frequency converter uniqueness-exchange conversion characteristic has determined frequency converter applicable to more wide in range power supply occasion, drives threephase asynchronous machine, also more can satisfy the process requirements of lifting occasion, and have following advantage concurrently, efficient is high, staring torque is large, and be speed control by constant torque, commutation, speed governing are convenient, can many grades of speed of Set arbitrarily, stepless time adjustment, wiring is simple, and failure rate is low etc. are easy to use.
Based on above-mentioned, the beneficial effects of the utility model are: simple in structure, easy to make, by adopting converter technique, the power supply that to process through frequency converter is with the formal output of the three-phase electricity power circuit to electric block, control hoisting and descending of electric block, the braking resistor of the special adapted of frequency converter is built in the electric block control box, by electric block shell distribute heat, and voltage remains unchanged in this process, can be used in easily the Electric Chain Blocks product of various models and variously also can be used on the weight-lifting equipment of other similar functions without in the three phase mains occasion, Practical Performance is excellent, use flexibly, modern design is a kind of good innovation scheme, and the marketing prospect is arranged very much.
The technical personnel of the industry should be understood; the utility model is not restricted to the described embodiments; that describes in above-described embodiment and the specification sheets just illustrates principle of the present utility model; the utility model also has various changes and modifications under the prerequisite that does not break away from the utility model spirit and scope, and these changes and improvements all fall in claimed the utility model scope.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (5)
1. electric block that adopts converter technique can be used in single phase poaer supply, comprise main frame, one side of main frame is equipped with control handle, the opposite side of main frame is provided with lifting special converter control box, it is characterized in that: lifting special converter control box inside is provided with frequency converter, and the major loop of frequency converter includes rectifying circuit, condenser network, inverter circuit; Single-phase voltage carries out rectification by diode VD1, diode VD2, diode VD3, diode VD4 to simple phase current by the single phase poaer supply interface and forms rectifying circuit, the current delivery that rectifying circuit will be processed is given the condenser network that is carried out the electric charge storage by electric capacity Ec, condenser network forms inverter circuit by three groups of one-way electric powers that insulated gate bipolar transistor IGBT distributes above, three groups of one-way electric powers above the inverter circuit form the three phase mains interface, and the three phase mains interface connects motor.
2. described a kind of electric block that adopts converter technique can be used in single phase poaer supply according to claim 1 is characterized in that: disposes accordingly braking resistor according to power of motor in the electric block electric cabinet.
3. described a kind of electric block that adopts converter technique can be used in single phase poaer supply according to claim 1, it is characterized in that: surface one end of control handle is provided with operation push-button, and the other end of control handle is provided with scram button.
4. described a kind of electric block that adopts converter technique can be used in single phase poaer supply according to claim 1, it is characterized in that: described host configuration has the chain bag, and chain bag inside is equipped with load chain, and the below of load chain is provided with limit spring.
5. described a kind of electric block that adopts converter technique can be used in single phase poaer supply according to claim 4, it is characterized in that: the upper end of described load chain is equipped with hook, the lower end of load chain is equipped with lower suspension hook, hook and the lower safety tongue that is provided with above the suspension hook.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320237706 CN203237963U (en) | 2013-05-03 | 2013-05-03 | Electric hoist adopting frequency conversion technology and capable of being used in single-phase power source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320237706 CN203237963U (en) | 2013-05-03 | 2013-05-03 | Electric hoist adopting frequency conversion technology and capable of being used in single-phase power source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203237963U true CN203237963U (en) | 2013-10-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320237706 Expired - Fee Related CN203237963U (en) | 2013-05-03 | 2013-05-03 | Electric hoist adopting frequency conversion technology and capable of being used in single-phase power source |
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| CN (1) | CN203237963U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105060153A (en) * | 2015-08-15 | 2015-11-18 | 河南正大起重设备有限公司 | Novel energy-saving electric hoist |
| CN108657951A (en) * | 2018-07-03 | 2018-10-16 | 信华智能装备(江苏)有限公司 | A kind of electric block structure of lifting equipment |
| CN109560724A (en) * | 2018-12-21 | 2019-04-02 | 珠海格力智能装备有限公司 | Control method and device, the control system of servo motor of servo motor |
-
2013
- 2013-05-03 CN CN 201320237706 patent/CN203237963U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105060153A (en) * | 2015-08-15 | 2015-11-18 | 河南正大起重设备有限公司 | Novel energy-saving electric hoist |
| CN108657951A (en) * | 2018-07-03 | 2018-10-16 | 信华智能装备(江苏)有限公司 | A kind of electric block structure of lifting equipment |
| CN109560724A (en) * | 2018-12-21 | 2019-04-02 | 珠海格力智能装备有限公司 | Control method and device, the control system of servo motor of servo motor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131016 Termination date: 20170503 |