CN102744846A - Injection molding machine - Google Patents
Injection molding machine Download PDFInfo
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- CN102744846A CN102744846A CN2011101071091A CN201110107109A CN102744846A CN 102744846 A CN102744846 A CN 102744846A CN 2011101071091 A CN2011101071091 A CN 2011101071091A CN 201110107109 A CN201110107109 A CN 201110107109A CN 102744846 A CN102744846 A CN 102744846A
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Abstract
The invention discloses an injection molding machine, comprising a servo-controlled system, wherein the servo-controlled system comprises a control valve, an oil tank, an oil outlet pipe, an oil return pipe, a fixed displacement pump and a hydraulic cylinder as the power of the injection molding machine, the oil outlet pipe and the oil return pipe are connected with the control valve and the oil tank and are arranged between the control valve and the oil tank, front and rear cavities separated by a piston are arranged in the hydraulic cylinder, the two cavities are respectively connected with the control valve, the fixed displacement pump is arranged on the oil outlet pipe, the servo-controlled system further comprises a servo motor, a rotary encoder, a servo drive controller and a pressure sensor, the servo motor is connected with the fixed displacement pump in a transmission way; the rotary encoder is arranged on the servo motor, and the output signals are input to the servo drive controller; the pressure sensor is arranged on the oil outlet pipe, and the output signals are input to the servo drive controller, and the servo drive controller is electrically connected with the servo motor. The injection molding machine has the following advantages: 1, good energy-saving performance; 2, quick respond speed; 3, high repeat precision; and 4, prolonged service life of the hydraulic system.
Description
Technical field
The present invention relates to a kind of injection machine.
Background technology
Along with the development of society, injection machine is more and more widely used.Existing injection machine servo-control system, it comprises control valve, fuel tank, flowline, oil return pipe, constant displacement pump and hydraulic jack, flowline and oil return pipe are connected between control valve and the fuel tank; Hydraulic jack is then as the injection machine power source; Control valve is then controlled the break-make of two chamber oil circuits of hydraulic jack, and constant displacement pump is arranged on the flowline and for whole hydraulic system pressure is provided, and the existing quantitative pump is usually by Induction Motor-Driven; The asynchronous machine control accuracy is poor; In use in order to ensure the operate as normal of injection machine, for each action of injection machine, asynchronous machine all is that total power starts; Hydraulic state when whole hydraulic system also is in the startup of asynchronous machine total power all the time, bring following problem with regard to the use of giving injection machine like this:
1, asynchronous machine is in the increase that the total power running will cause energy consumption all the time; Caloric value also can correspondingly increase simultaneously; Not only asynchronous machine damages because of heat is too high easily, and will cause that the temperature in whole workshop raises, and is that the personnel health will exert an influence to other equipment in the workshop;
2, the asynchronous machine starting current is big, and is having in the workshop of many injection machines, big to the capacity requirement of whole electrical network;
Hydraulic state when 3, hydraulic system is in the startup of asynchronous machine total power all the time, the Hydraulic Elements in the whole system are impaired easily, influence the service life of hydraulic system, thereby cause the increase of operation cost;
4, asynchronous machine motor response speed is slow, is unfavorable for the accurate control in the injection moulding process, and repeatable accuracy is low.
Because above-mentioned shortcoming, existing injection machine can not satisfy people's instructions for use effectively, therefore is necessary to improve.
Summary of the invention
The objective of the invention is the injection machine that a kind of energy-efficient performance is good, response speed is fast, the high while of repeatable accuracy can effectively prolong the hydraulic injection molding machine lifetime of system that designs for the deficiency that solves above-mentioned technology.
The injection machine that the present invention designed; It comprises servo-control system; Described servo-control system comprises control valve, fuel tank, flowline, oil return pipe, constant displacement pump and as the hydraulic jack of injection machine power, said flowline and oil return pipe are connected between control valve and the fuel tank, are provided with former and later two chambers that separated by piston in the said hydraulic jack; These two chambers link to each other with control valve respectively; Said constant displacement pump is arranged on the flowline, it is characterized in that described servo-control system also comprises servomotor, rotary encoder, servo-drive controller and pressure sensor, and said servomotor and constant displacement pump are in transmission connection; Said rotary encoder is arranged on the servomotor, and its output signal inputs to the servo-drive controller; Said pressure sensor is arranged on the flowline; Its output signal also inputs to the servo-drive controller; Said servo-drive controller is electrically connected with servomotor. in this injection machine; Servomotor, rotary encoder, servo-drive controller have formed a close loop control circuit, and the servo-drive controller can accurately be controlled the rotation of servomotor; Pressure sensor, servomotor, servo-drive controller and constant displacement pump have formed the another one close loop control circuit again; Pressure sensor can effectively be measured the pressure condition on the oil pipe; And with signal feedback to servo-drive controller; The servo-drive controller is effectively controlled servomotor according to setting, and then regulates constant displacement pump, because closely related at flowline upward pressure and flow; This servo-control system can have two kinds of duties: flow-control state and pressure state of a control are equivalent to the work of analogue flow rate proportioning valve and pressure proportioning valve.Under the flow-control state, the detected pressure of pressure sensor is less than the pressure of setting, and servomotor is promptly controlled the rotating speed of servomotor by the work of flow-control state, makes the output flow of constant displacement pump keep reaching setting value; Under the pressure state of a control, pressure sensor monitoring to pressure will reach or when reaching setting value, the torque of servomotor is promptly controlled in the work of servomotor pressing force state of a control, makes the output pressure of constant displacement pump and flow remain on setting value.
As preferably, described servomotor is a permanent magnet synchronous servo motor, and permanent magnet synchronous servo motor can reach higher control accuracy.
The injection machine of gained of the present invention; Owing to adopt the servo-drive controller and wait for an opportunity the combination of motor and replace existing asynchronous machine to drive constant displacement pump; Waiting for an opportunity motor can be converted into torque and rotating speed with the drive controlling object with voltage signal; The servo-drive controller can accurately be controlled and wait for an opportunity the angle that motor turns over, and can treat with a certain discrimination for each step action of injection machine, through accurate control constant displacement pump required oil pressure of each step is provided; Can guarantee the normal use of injection machine; Can avoid again being in the total power motion state all the time, can make simultaneously to be in the whole hydraulic system comparatively reasonably in the pressure limit that therefore compared with prior art native system has following advantage: 1, energy-efficient performance is good as asynchronous machine; 2, response speed is fast; 3, repeatable accuracy is high; 4, prolong the hydraulic injection molding machine lifetime of system; 5, this servo-control system is first Application on injection machine, therefore can make injection machine have novel features.
Description of drawings
Fig. 1 is embodiment 1 structural representation;
Among the figure: control valve 1, fuel tank 2, flowline 3, oil return pipe 4, constant displacement pump 5, hydraulic jack 6, servomotor 7, rotary encoder 8, servo-drive controller 9, pressure sensor 10.
The specific embodiment
Combine accompanying drawing that the present invention is done further description through embodiment below.
Embodiment 1:
As shown in Figure 1; The described injection machine of present embodiment, it comprises servo-control system, described servo-control system comprises control valve 1, fuel tank 2, flowline 3, oil return pipe 4, constant displacement pump 5 and as the hydraulic jack 6 of injection machine power; Said flowline 3 and oil return pipe 4 are connected between control valve 1 and the fuel tank 2; Be provided with former and later two chambers that separated by piston in the said hydraulic jack 6, these two chambers link to each other with control valve 1 respectively, and said constant displacement pump 5 is arranged on the flowline 3; Described servo-control system also comprises servomotor 7, rotary encoder 8, servo-drive controller 9 and pressure sensor 10, and said servomotor 7 is in transmission connection with constant displacement pump 5; Said rotary encoder 8 is arranged on the servomotor 7, and its output signal inputs to servo-drive controller 9; Said pressure sensor 10 is arranged on flowline 3 roads; Its output signal also inputs to servo-drive controller 9, and said servo-drive controller 9 is electrically connected with servomotor 7, and wherein the described servomotor 7 of present embodiment is a permanent magnet synchronous servo motor 7; Certainly also can adopt other servomotor 7; Only permanent magnet synchronous servo motor 7 can reach higher control accuracy, and through turning over test, result of use is better more.
The described injection machine of present embodiment; Each step action for injection machine can be treated with a certain discrimination; Through accurate control constant displacement pump 5 required oil pressure of each step is provided; Can guarantee the normal use of injection machine, can avoid being in the total power motion state all the time, can make simultaneously to be in the whole hydraulic system comparatively reasonably in the pressure limit as asynchronous machine.In addition, this servo-control system has two kinds of duties: flow-control state and pressure state of a control are equivalent to the work of analogue flow rate proportioning valve and pressure proportioning valve.Under the flow-control state, pressure sensor 10 detected pressure are less than the pressure of setting, and servomotor 7 is promptly controlled the rotating speed of servomotor 7 by the work of flow-control state, makes the output flow of constant displacement pump 5 keep reaching setting value; Under the pressure state of a control; The pressure that pressure sensor 10 monitors will reach or when reaching setting value, the torque of servomotor 7 is promptly controlled in the work of servomotor 7 pressing force state of a controls; Make the output pressure and the flow of constant displacement pump 5 remain on setting value, therefore control better effects if.
The described injection machine of present embodiment compared with prior art has following advantage:
1, energy-efficient performance is good: the injection machine than traditional can save energy 45%～85%, and is particularly evident at the pressurize cooling stage especially;
2, response speed is fast: flow output only needs 30ms from static the commentaries on classics to 1500, reduces to move switching time, adds the fast motion beat, can enhance productivity 10%～15%;
3, repeatable accuracy is high: injection pressure and flow closed loop can realize closed-loop control, and the repeatable accuracy error can be controlled in 3%, the rate of effectively reducing the number of rejects and seconds;
4, prolong the hydraulic injection molding machine lifetime of system, reduce equipment failure rate;
5, this servo-control system is first Application on injection machine, therefore can make injection machine have novel features.
The protection domain that need to prove this patent is not limited to the foregoing description, and those of ordinary skills do conventional change according to above-mentioned teachings, should all fall into the protection domain of this patent.
Claims (2)
1. injection machine; It comprises servo-control system; Described servo-control system comprises control valve, fuel tank, flowline, oil return pipe, constant displacement pump and as the hydraulic jack of injection machine power, said flowline and oil return pipe are connected between control valve and the fuel tank, are provided with former and later two chambers that separated by piston in the said hydraulic jack; These two chambers link to each other with control valve respectively; Said constant displacement pump is arranged on the flowline, it is characterized in that described servo-control system also comprises servomotor, rotary encoder, servo-drive controller and pressure sensor, and said servomotor and constant displacement pump are in transmission connection; Said rotary encoder is arranged on the servomotor, and its output signal inputs to the servo-drive controller; Said pressure sensor is arranged on the flowline, and its output signal also inputs to the servo-drive controller, and said servo-drive controller is electrically connected with servomotor.
2. injection machine according to claim 1 is characterized in that described servomotor is a permanent magnet synchronous servo motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101071091A CN102744846A (en) | 2011-04-20 | 2011-04-20 | Injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101071091A CN102744846A (en) | 2011-04-20 | 2011-04-20 | Injection molding machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102744846A true CN102744846A (en) | 2012-10-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011101071091A Pending CN102744846A (en) | 2011-04-20 | 2011-04-20 | Injection molding machine |
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| CN (1) | CN102744846A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103727100A (en) * | 2014-01-16 | 2014-04-16 | 焦作市华科液压机械制造有限公司 | Digital type hydraulic cylinder |
| CN103920862A (en) * | 2014-04-30 | 2014-07-16 | 重庆立致和节能科技有限公司 | Die-casting machine asynchronous servo energy-saving control method and system |
| CN106217797A (en) * | 2016-08-31 | 2016-12-14 | 罗海灵 | A kind of pressure-retaining system, the injection machine applying this system and Shooting Technique |
| CN106738602A (en) * | 2016-12-26 | 2017-05-31 | 海宁王骏橡塑制品有限公司 | A kind of injection machine for producing socks hook |
| CN110219839A (en) * | 2019-07-10 | 2019-09-10 | 济南东测试验机技术有限公司 | A kind of mute oil sources of testing machine electro-hydraulic servo dynamic test energy-saving servo |
-
2011
- 2011-04-20 CN CN2011101071091A patent/CN102744846A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103727100A (en) * | 2014-01-16 | 2014-04-16 | 焦作市华科液压机械制造有限公司 | Digital type hydraulic cylinder |
| CN103920862A (en) * | 2014-04-30 | 2014-07-16 | 重庆立致和节能科技有限公司 | Die-casting machine asynchronous servo energy-saving control method and system |
| CN103920862B (en) * | 2014-04-30 | 2016-03-09 | 重庆立致和节能科技有限公司 | The asynchronous energy-saving servo control method of die casting machine and control system thereof |
| CN106217797A (en) * | 2016-08-31 | 2016-12-14 | 罗海灵 | A kind of pressure-retaining system, the injection machine applying this system and Shooting Technique |
| CN106738602A (en) * | 2016-12-26 | 2017-05-31 | 海宁王骏橡塑制品有限公司 | A kind of injection machine for producing socks hook |
| CN110219839A (en) * | 2019-07-10 | 2019-09-10 | 济南东测试验机技术有限公司 | A kind of mute oil sources of testing machine electro-hydraulic servo dynamic test energy-saving servo |
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Application publication date: 20121024 |