CN102457060A - Injection molding machine with energy-saving device and inverter - Google Patents
Injection molding machine with energy-saving device and inverter Download PDFInfo
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- CN102457060A CN102457060A CN2010105197427A CN201010519742A CN102457060A CN 102457060 A CN102457060 A CN 102457060A CN 2010105197427 A CN2010105197427 A CN 2010105197427A CN 201010519742 A CN201010519742 A CN 201010519742A CN 102457060 A CN102457060 A CN 102457060A
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- 238000001746 injection moulding Methods 0.000 title claims abstract description 41
- 239000003990 capacitor Substances 0.000 claims abstract description 39
- 238000004146 energy storage Methods 0.000 claims abstract description 31
- 230000005611 electricity Effects 0.000 claims description 10
- 238000004134 energy conservation Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000005662 electromechanics Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
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Abstract
The invention relates to an injection molding machine with an energy-saving device, which comprises an inverter, wherein the inverter comprises a rectifying unit, an inverting unit, a direct current bus, an energy storage unit and an energy-saving unit, two ends of the direct current bus are respectively connected to a direct current output terminal of the rectifying unit and a direct current input terminal of the inverting unit, two ends of the energy storage unit and two ends of the energy-saving unit are respectively connected to a positive bus bar and a negative bus bar of the direct current bus, and the energy-saving unit comprises an energy storage capacitor. The invention also relates to an inverter. The energy-saving unit is added on the injection molding machine based on the inverter control, so that the voltage rise of the inverter bus can be effectively inhibited, and the redundant energy is stored, so that the braking unit is omitted, and the energy is effectively saved.
Description
Technical field
The present invention relates to injection molding machine field, field, more particularly, relate to a kind of injection molding machine and inverter with energy saver.
Background technology
Injection molding machine is to utilize mould for plastics to process the main former of the plastic products of different shape thermoplastics or thermosetting material.
In the course of work of injection molding machine, colloidal sol for example, injection, pressurize, the folding mould, thimbles etc. all need motor to brake.When the inverter translator load braking of injection molding machine, because machinery inertial, this moment, motor was in generating state, and unnecessary energy turns back in the electric capacity of dc bus through inverter, thereby causes busbar voltage to rise.And the device on the bus has certain withstand voltage limit, surpasses this certain limit and can cause device failure, and inverter is damaged.
Usually reduce the inverter dc bus two kinds of methods are arranged: (1) parallel resistance on dc bus, fall the energy consumption that unnecessary mechanical device feeds back to through resistance.Yet in this scheme, energy consumes in vain on resistance greatly, causes the use cost of injection molding machine to rise (for a product of producing with injection molding machine, its prime cost is exactly the electricity charge).
(2) on bus, increase energy feedback unit, feed back to electrical network to excess energy.In this scheme, though can also can only have portion of energy to feed back to electrical network on the energy back net of wiring back, self also will consume portion of energy.Because energy feedback unit itself is made up of switching device, in feedback energy, power grid quality is also had certain influence simultaneously.
In addition; In the method for above-mentioned two kinds of reduction inverter DC bus-bar voltages; Owing to need specific circuit confirm the time started of reduced pressure operation, so the problem of a response time is all arranged, also be difficult to accomplish the effect of fast braking in the occasion that needs fast braking such as injection molding machine etc.And also there is the problem of dependability in above-mentioned step-down method owing to there is the circuit of more complicated.
Summary of the invention
The technical problem that the present invention will solve is, energy dissipation and slower problem of corresponding time provide a kind of injection molding machine and inverter with energy saver during to above-mentioned reduction injection molding machine inverter DC bus-bar voltage.
The technical scheme that the present invention solves the problems of the technologies described above is; A kind of injection molding machine with energy saver is provided; Comprise inverter; Said inverter comprises rectification unit, inversion unit, dc bus, energy-storage units and power saving unit; The two ends of wherein said dc bus are connected respectively to dc output end of rectification unit and direct-flow input end of inversion unit, and the two ends of said energy-storage units and power saving unit are connected respectively to the positive busbar and the negative busbar of said dc bus, and said power saving unit comprises storage capacitor.
In the injection molding machine with energy saver of the present invention, said power saving unit comprises the buffer circuit that powers on, and said buffer circuit and the energy storage capacitor in series of powering on is connected between the positive busbar and negative busbar of said dc bus.
In the injection molding machine with energy saver of the present invention, the said buffer circuit that powers on comprises first resistance that is connected with energy storage capacitor in series and the switch that is parallel-connected to the said first resistance two ends, and it is closed that said switch is full of the electricity back at storage capacitor.
In the injection molding machine with energy saver of the present invention, said energy-conservation electric capacity comprises first electric capacity that is connected in series and second electric capacity and second resistance and the 3rd resistance that are connected in parallel with said first electric capacity and second electric capacity respectively.
In the injection molding machine with energy saver of the present invention, the capacitance of said storage capacitor is directly proportional with the power of injection molding machine.
The present invention also provides a kind of inverter; Comprise rectification unit, inversion unit, dc bus, energy-storage units and power saving unit; The two ends of wherein said dc bus are connected respectively to dc output end of rectification unit and direct-flow input end of inversion unit; The two ends of said energy-storage units and power saving unit are connected respectively to the positive busbar and the negative busbar of said dc bus, and said power saving unit comprises storage capacitor.
In inverter of the present invention, said power saving unit comprises the buffer circuit that powers on, and said buffer circuit and the energy storage capacitor in series of powering on is connected between the positive busbar and negative busbar of said dc bus.
In inverter of the present invention, the said buffer circuit that powers on comprises first resistance that is connected with energy storage capacitor in series and the switch that is parallel-connected to the said first resistance two ends, and it is closed that said switch is full of the electricity back at storage capacitor.
In inverter of the present invention, said energy-conservation electric capacity comprises first electric capacity that is connected in series and second electric capacity and second resistance and the 3rd resistance that are connected in parallel with said first electric capacity and second electric capacity respectively.
In inverter of the present invention, said storage capacitor be dc bus the energy-storage units capacitance 4/5ths.
The present invention has the injection molding machine and the inverter of energy saver; Through comprise the power saving unit of storage capacitor in the dc bus increase, can effectively suppress the inverter busbar voltage and rise, get up unnecessary energy storage simultaneously; Not only save brake unit, and effectively practiced thrift the energy.The present invention is simple in structure, does not have complicated circuitry, and whole device is very reliable.
Description of drawings
Fig. 1 is the sketch map of embodiment of the injection molding machine of tool energy saver of the present invention.
Fig. 2 is the sketch map of the embodiment of power saving unit among Fig. 1.
Embodiment
Through investigation, the operation cost of injection molding machine is mainly decided by the electricity charge of producing product and production desired time of product.In order to enhance productivity, need be each production link of injection molding machine like colloidal sol, injection, pressurize, folding mould, thimble all need the motor fast braking.In addition, the braking of injection molding machine is characterized in different such as the braking of crane, elevator, blower fan: braking is frequent, but braking inertia is little.
Based on the problems referred to above, the present invention proposes a kind of mode of braking of novelty, can effectively avoid the energy dissipation and the quick response that improves braking of braking procedure.The present invention replaces brake unit through increase energy saver at dc bus, and the feedback energy of the mechanical inertia of injection molding machine is stored, and not only can satisfy the braking requirement of injection molding machine, and can save the power consumption of whole injection molding machine.
As shown in Figure 1, be the sketch map of embodiment of the injection molding machine of tool energy saver of the present invention.In the present embodiment; Injection molding machine comprises inverter; This inverter comprises rectification unit 21, inversion unit 22, dc bus 24, energy-storage units 23 and power saving unit 25; Wherein the two ends of dc bus 24 are connected respectively to dc output end of rectification unit 21 and direct-flow input end of inversion unit 23, and energy-storage units 22 and power saving unit 25 are connected in respectively between the positive and negative busbar of dc bus 24, and power saving unit 25 includes storage capacitor.
When motor ran well, rectification unit 21 converted the power frequency electricity into direct current, and inversion unit 23 converts direct current into alternating current and outputs to motor, made motor rotation work; When motor braking; Machine shaft remains in operation under effect of inertia; And the generation alternating current, the alternating current that inversion this moment part 23 produces above-mentioned motor rotation converts direct current into and outputs to dc bus 24, and energy-storage units 22 and power saving unit 25 store above-mentioned electric energy.The electric energy that energy-storage units 22 and power saving unit 25 store is discharged into dc bus 24 when motor rotation is worked, thereby is motor operation power supply.
In the present embodiment, the rectification unit in the motor control module 21, energy-storage units 22 and inversion unit 23 are identical with the structure that is common inverter.
The relation that mechanical inertia when formula (1) is braking and voltage rise.
G?∝?C*U*U （1）
Wherein G is an electromechanics moment of inertia value, and C is the capacitance on the dc bus, and U is a d-c bus voltage value.
Can know by formula (1), under the certain situation of mechanical inertia (also equivalence is for feeding back to the power of dc bus), increase the dc-link capacitance of inverter, can suppress the rising of busbar voltage.
For example; At the injection molding machine dedicated servo driver (driver of sampling 20A; The bus capacitor of this servo-driver is about 2500uF) in; When the electric capacity of power saving unit is got the 2000uF left and right sides, also promptly about 4/5 dc-link capacitance, the busbar voltage maximum limit is below 700V during the injection molding machine operate as normal; And when not having power saving unit, DC bus-bar voltage is up to about 850V during the injection molding machine operate as normal, causes driver overvoltage protection to occur.Can reflect that from above-mentioned experimental data behind the increase power saving unit, driver can be installed extra brake unit.
Therefore above-mentioned injection molding machine with energy saver can save 5% electric weight owing to do not have energy loss during braking.The different working conditions energy-saving effect is different.Usually, the value of storage capacitor is directly proportional with the power of injection molding machine motor in the power saving unit.
As shown in Figure 2; When using at the scene; If power saving unit is not and bus capacitor (being energy-storage units) powers on simultaneously, also to increase the buffer circuit that powers on, be connected to after promptly power on buffer circuit and the energy storage capacitor in series between the positive busbar (P) and negative busbar (N) of dc bus.
The buffer circuit that powers on comprises first resistance R 1 that is connected with energy storage capacitor in series and the K switch 1 that is parallel-connected to first resistance R, 1 two ends, and this K switch 1 is connected to control logic and is full of the electricity back at storage capacitor closed through port PR1-PR2.In the present embodiment, K switch 1 adopts contactor.
Energy-conservation electric capacity comprises first capacitor C 1 that is connected in series and second capacitor C 2 and second resistance R 2 and the 3rd resistance R 3 that are connected in parallel with first capacitor C 1 and second capacitor C 2 respectively; Wherein the resistance of second resistance R 2 and the 3rd resistance R 3 is relevant with the value of first capacitor C 1 and second capacitor C 2, is used for the voltage at balanced first capacitor C 1 and second capacitor C, 2 two ends.Above-mentioned second resistance R 2 and the 3rd resistance R 3 also can be omitted.
In the inverter back (also can be full of electricity back) that powers at energy-storage units, power saving unit through first resistance R 1 to the storage capacitor charging, after storage capacitor is full of electricity, through RR1-RR2 adhesive contactor, power saving unit completions that power on since then, entering operating state.
Certainly, in practical application, the above-mentioned buffer circuit that powers on also can be replaced by other existing circuit with identical function.
Inverter in the foregoing description also can be applicable to other and brakes frequent, the little occasion of braking inertia, carries out corresponding Electric Machine Control.
The above; Be merely the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technical staff who is familiar with the present technique field is in the technical scope that the present invention discloses; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (10)
1. injection molding machine with energy saver; Comprise inverter; It is characterized in that said inverter comprises rectification unit, inversion unit, dc bus, energy-storage units and power saving unit, the two ends of wherein said dc bus are connected respectively to dc output end of rectification unit and direct-flow input end of inversion unit; The two ends of said energy-storage units and power saving unit are connected respectively to the positive busbar and the negative busbar of said dc bus, and said power saving unit comprises storage capacitor.
2. the injection molding machine with energy saver according to claim 1 is characterized in that said power saving unit comprises the buffer circuit that powers on, and said buffer circuit and the energy storage capacitor in series of powering on is connected between the positive busbar and negative busbar of said dc bus.
3. the injection molding machine with energy saver according to claim 2; It is characterized in that; The said buffer circuit that powers on comprises first resistance that is connected with energy storage capacitor in series and the switch that is parallel-connected to the said first resistance two ends, and it is closed that said switch is full of the electricity back at storage capacitor.
4. the injection molding machine with energy saver according to claim 3; It is characterized in that said energy-conservation electric capacity comprises first electric capacity that is connected in series and second electric capacity and second resistance and the 3rd resistance that are connected in parallel with said first electric capacity and second electric capacity respectively.
5. according to each described injection molding machine among the claim 1-4, it is characterized in that the capacitance of said storage capacitor is directly proportional with the power of injection molding machine with energy saver.
6. inverter; It is characterized in that; Comprise rectification unit, inversion unit, dc bus, energy-storage units and power saving unit; The two ends of wherein said dc bus are connected respectively to dc output end of rectification unit and direct-flow input end of inversion unit, and the two ends of said energy-storage units and power saving unit are connected respectively to the positive busbar and the negative busbar of said dc bus, and said power saving unit comprises storage capacitor.
7. inverter according to claim 6 is characterized in that said power saving unit comprises the buffer circuit that powers on, and said buffer circuit and the energy storage capacitor in series of powering on is connected between the positive busbar and negative busbar of said dc bus.
8. inverter according to claim 7 is characterized in that, the said buffer circuit that powers on comprises first resistance that is connected with energy storage capacitor in series and the switch that is parallel-connected to the said first resistance two ends, and it is closed that said switch is full of the electricity back at storage capacitor.
9. inverter according to claim 8 is characterized in that, said energy-conservation electric capacity comprises first electric capacity that is connected in series and second electric capacity and second resistance and the 3rd resistance that are connected in parallel with said first electric capacity and second electric capacity respectively.
10. inverter according to claim 6 is characterized in that, said storage capacitor be dc bus the energy-storage units capacitance 4/5ths.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105197427A CN102457060A (en) | 2010-10-26 | 2010-10-26 | Injection molding machine with energy-saving device and inverter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105197427A CN102457060A (en) | 2010-10-26 | 2010-10-26 | Injection molding machine with energy-saving device and inverter |
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| CN102457060A true CN102457060A (en) | 2012-05-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109039095A (en) * | 2018-07-17 | 2018-12-18 | 上海广为焊接设备有限公司 | Single phase ac regulated power supply |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11289793A (en) * | 1998-03-31 | 1999-10-19 | Sumitomo Heavy Ind Ltd | Motor injection molding machine equipped with higher harmonic control type power supply generating converter |
| CN101521470A (en) * | 2009-03-26 | 2009-09-02 | 严兆基 | Power supply method and power supply system for rubber-tyred container gantry crane |
| CN101800479A (en) * | 2010-03-24 | 2010-08-11 | 深圳市正弦电气有限公司 | Intelligently-annealing power source control device |
-
2010
- 2010-10-26 CN CN2010105197427A patent/CN102457060A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11289793A (en) * | 1998-03-31 | 1999-10-19 | Sumitomo Heavy Ind Ltd | Motor injection molding machine equipped with higher harmonic control type power supply generating converter |
| CN101521470A (en) * | 2009-03-26 | 2009-09-02 | 严兆基 | Power supply method and power supply system for rubber-tyred container gantry crane |
| CN101800479A (en) * | 2010-03-24 | 2010-08-11 | 深圳市正弦电气有限公司 | Intelligently-annealing power source control device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109039095A (en) * | 2018-07-17 | 2018-12-18 | 上海广为焊接设备有限公司 | Single phase ac regulated power supply |
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Application publication date: 20120516 |