CN202129950U - Thread core pulling mechanism of injection mould - Google Patents
Thread core pulling mechanism of injection mould Download PDFInfo
- Publication number
- CN202129950U CN202129950U CN201120270224U CN201120270224U CN202129950U CN 202129950 U CN202129950 U CN 202129950U CN 201120270224 U CN201120270224 U CN 201120270224U CN 201120270224 U CN201120270224 U CN 201120270224U CN 202129950 U CN202129950 U CN 202129950U
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- thread core
- push pedal
- pulling mechanism
- core
- injection mould
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Abstract
The utility model provides a thread core pulling mechanism of an injection mould, which comprises a mould cavity, an injection moulding part, a thread core in the injection moulding part, a push plate below the injection moulding part; the thread core is connected with a rotary core pulling mechanism; the push plate is connected with an ejection mechanism; the thread core puling mechanism further comprises a PLC (Programmable Logic Control) synchronous control system capable of synchronizing the core pulling stroke of the thread core and the ejection stroke of the push plate; the ejection mechanism comprises a servo motor, a chain wheel pair and a screw nut pair; the servo motor is connected with the chain wheel pair which is connected with the screw nut pair; and the screw nut pair is connected with the push plate. The thread core pulling mechanism of the injection mould is simple and reasonable in structure, a screw and a nut are used to convert the rotary motion into linear motion, the ejection mechanism is further changed into a labor saving mechanism, the torque of the servo motor can be reduced, the mechanism can be installed more conveniently, and the thread core pulling mechanism of the injection mould shows obvious technical advancement.
Description
Technical field
The utility model relates to a kind of injection mould core-pulling mechanism, relates in particular to servo synchronous injection mould screw thread core-pulling mechanism.
Background technology
In injection mould,, just can not directly extract thread core out and take off by force if screw thread is arranged in the working of plastics; Otherwise destroy the female thread structure of working of plastics easily; Stripping means commonly used at present is configuration one oil motor on thread core, and oil motor drives thread core to be deviate from from injection mold, and deviating from by two actions of screw thread realizes; The rotation of core is driven by oil motor; The action of part spline push pedal is driven by spring, but this mechanism because spring when releasing push pedal spring force change with stroke, it is inconsistent to cause push pedal action and screw thread to deviate from axial displacement.This reliability deficiency of taking off thread mechanism automatically; Especially under the situation that reach is long; The difficulty of this mechanism is bigger, and push pedal ejects the initial stage spring force and crosses conference and cause screw thread to drag flower, ejects later stage ejecting force deficiency and causes the push pedal can not spline with separating of part; So be difficult to make qualified products, aborning also influence production because it is unstable.
For this reason; The utility model people had once designed the servo lazy-tongs of a kind of internal thread automatic demoulding; Thread core and push pedal are in transmission connection with rotating mechanism and elevating mechanism respectively; The stroke of two mechanisms realizes that through the control of control system the axial velocity of rotating mechanism back-out screw thread is consistent with the speed of elevating mechanism release push pedal.Thread core is connected with rotating shaft, and is in transmission connection through rotating shaft and rotating mechanism, and the structure of rotating mechanism comprises stepper motor and power transmission shaft, and power transmission shaft is connected through sprocket wheel with motor shaft.The rotating shaft lower end is fixedly connected with driven gear, and with the driving gear engagement of power transmission shaft upper end, the power transmission shaft lower end is provided with drive sprocket, and is connected with chain gear transmission on being connected motor shaft through chain.The concrete structure that elevating mechanism is released push pedal is such: referring to Fig. 1; Servomotor 9 ' drives worm and gear (worm screw 12 ' worm gear 11 '); Turbine 11 ' is driven gear 8 ' again; Gear 8 ' drives tooth bar 7 ', drives ejector retainner plate base plate 5 ' and ejector retainner plate 4 ' by tooth bar 7 ', drives push pedal 2 ' by ejector retainner plate 4 ' through four push rod 3 ' roofbolts.
This mechanism can make the rotation of push pedal and thread core take out and take off synchronously and carry out, and breaks through the restriction that the traditional mechanical formula is taken off helicitic texture, and still, there are three major defects in this system, and the one, ejecting mechanism is complicated.The action of push pedal need be passed through the transmission of ejector retainner plate, and the action of ejector retainner plate is through the driving of tooth bar, and the action of tooth bar is through the driving of turbine and worm, and so, the ratio of precision of manufacturing is difficult to guarantee; Especially being connected of ejector retainner plate and tooth bar,, can cause thrust to increase,, also can produce bigger frictional force at ejector retainner plate guide pillar place even because ejector retainner plate has slight inclination because tooth bar is not eccentric promotion at the center of ejector retainner plate; The 2nd, though the turbine and worm reducing gear helps reducing the driving force requirement of servomotor, speed reducing ratio is as being 1: 20, and then driving force is 1/20 of a tooth bar place thrust, but servomotor power and the volume selected like this are still bigger; The 3rd, turbine and worm mechanism places the gripper shoe outside of mould, has increased mould and has taken volume, waits for lifting and makes troubles.
The utility model content
The main purpose of the utility model be to provide a kind of compact conformation reasonable, easy to use, effectively guarantee the injection mould automatic core-pulling mechanism that screw thread is intact, improve yield rate, to overcome the deficiency of prior art.
The technical scheme of the utility model is: injection mould screw thread core-pulling mechanism; Comprise die cavity, moulding, the thread core in moulding, the push pedal below the moulding; Said thread core connects the rotation core-pulling mechanism, and said push pedal connects ejecting mechanism, also comprises thread core is loosed core and the synchronous PLC synchronous control system of push pedal ejection stroke; Said ejecting mechanism comprises servomotor, chain wheel pair, feed screw nut pair; Said servomotor connection chain wheel set, chain wheel pair connects feed screw nut pair, and feed screw nut pair connects said push pedal.
Preferably, said feed screw nut is provided with connecting rod, and the other end of said connecting rod is fixed in the push pedal.
Preferably, moving platen is located at the below of push pedal, on moving platen, is provided with through hole, and through-hole wall is provided with the connecting rod guide pin bushing, and said connecting rod passes the connecting rod guide pin bushing and is fixedly connected with push pedal.
Preferably, in push pedal, be provided with guide hole, built-in ball guide pillar, an end of said ball guide pillar are fixed on the moving platen bottom.
Preferably, the bearings at both ends of said screw mandrel is fixed on the base and moving platen of core-pulling mechanism.
Preferably; Said rotation core-pulling mechanism comprises motor and power transmission shaft; One end of said motor and power transmission shaft is connected through sprocket wheel, the driving gear of the other end constant mesh gear group of said power transmission shaft, and the driven gear of engaging tooth wheels is installed in the rotating shaft of thread core.
Preferably, said motor is a stepper motor.
Preferably, said moulding is provided with the part detent mechanism that can make moulding and push pedal static relatively.
Preferably, said moulding bottom surface is provided with locating slot, and the corresponding moulding of said push pedal end face bottom surface is provided with positioning convex point.
Preferably, said guide hole is embedded with and the suitable guide pin bushing of said ball guide pillar.
The utility model compared with prior art has the following advantages:
The apparatus structure compact and reasonable utilizes the feed screw nut directly to convert gyration into rectilinear motion, has reduced the ejector retainner plate of prior art worm and gear elevating mechanism, the space under the mould pin thereby abundant, and mechanism's easy installation and removal, the accuracy of manufacture also guarantees easily.
The push pedal synchronizing control further makes ejecting mechanism become effort-saving mechanism after adopting leading screw to add nut structure, can reduce the servomotor moment of torsion, and the installation of mechanism is also more convenient.
The ball guide pillar has been adopted in push pedal, and the anti-eccentric ability of push pedal improves, and the resistance stable and uniform is released in push pedal.And, on feed screw nut, use two connecting rods to stop feed screw nut to rotate in the mechanism, transmit the release power that feed screw nut is given push pedal simultaneously, mechanism is greatly simplified.Through verification experimental verification; The injection mould automatic core-pulling mechanism design of the utility model is reasonable, and the synchronous ejecting mechanism of push pedal is light and handy, with manually moving the action that sprocket wheel can be realized push pedal; The release force rate existing structure of mechanism reduces much have tangible technical advance really.
Description of drawings
Fig. 1 takes off the structural representation of thread mechanism automatically for prior art;
Fig. 2 is the injection mould screw thread core-pulling mechanism structural representation of the utility model;
Fig. 3 is a core-pulling mechanism structural representation shown in Figure 2;
Fig. 4 is the synchronous ejecting mechanism structure of a push pedal A-A cut-away view shown in Figure 2;
Fig. 5 is the control flow chart of the utility model.
Among Fig. 2-4,1. stepper motor 2. mouldings 3. part detent mechanisms 4. feed screw nuts 41. nut backing plates 5. servomotors 6. thread cores 7. connecting rods 71. connecting rod guide pin bushings 72. connecting rod screws 8. leading screws 11. push pedals 12. ball guide pillars 13. planet-gear speed reducers 14. sprocket wheels 15. chains 81 travel switches 82 switch contacts
The specific embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is further described, should be appreciated that the specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
Referring to Fig. 2 one Fig. 4; This injection mould screw thread core-pulling mechanism; Comprise solid plate, moving platen, the moulding in die cavity 2 and thread core 6, also comprise thread core 6 core-pulling mechanism, be located at plastic injection piece 2 bottoms and push pedal 11 that when screw thread is loosed core, ejects synchronously and the synchronous ejecting mechanism of push pedal, thread core 6 is connected with core-pulling mechanism, push pedal 11 is connected with synchronous ejecting mechanism; The control system controls the motor speed of two mechanisms, and the stroke that screw thread is loosed core equates with the stroke that push pedal ejects.Form the die cavity of moulding 2 behind solid plate and the moving platen matched moulds, in moulding 2 is arranged, moving platen is below push pedal 11; The upper surface of push pedal 11 is close to the bottom surface of moulding, and solid plate does not illustrate in the accompanying drawing in the top position of moulding 2; At this moment, injection mold is shown in an open position.See Fig. 3; The push pedal upper surface be to be provided with rotating thread core 6 in two 2, two mouldings of two mouldings that go out in a chamber, thread core 6 is fixedly connected with the upper end of a rotating shaft; The lower end of rotating shaft is driven pulley fixedly; The driving wheel of driven pulley and transmission axle head is in transmission connection, and the other end of power transmission shaft is in transmission connection through the motor shaft of chain sprocket structure and stepper motor 1, has constituted screw thread core-pulling mechanism driven by stepper motors.
When core-pulling mechanism moves, require push pedal to eject synchronously, otherwise moulding will rotate with thread core, core-pulling mechanism can't be extracted core out.See Fig. 4; The synchronous ejecting mechanism of push pedal comprises: servomotor 5, chain gear transmission pair and feed screw nut's transmission; Servomotor 5 is fixed on the support of mould; Its motor shaft drives 13, two sprocket wheels 14 of planet-gear speed reducer and connects planet-gear speed reducer 13 and screw mandrel 8 respectively, transmits the moment of servomotor.Two sprocket wheels 14 connect through chain 15.On base and moving platen, push pedal 11 is placed on the moving platen screw mandrel 8 with bearing fixing, and moving platen and push pedal are provided with the ball guide pillar 12 that goes up and down in vertical direction in order to guiding push pedal 11.Assembling feed screw nut 4 on the screw mandrel 8, when chain gear transmission pair during to the screw mandrel carry-over moment, screw mandrel 8 rotations, feed screw nut 4 rises thereupon or descends.Feed screw nut 4 is connected with push pedal 11 through two connecting rods 7; The below of feed screw nut 4 is screwed nut backing plate 41; One end of connecting rod 7 passes feed screw nut and is installed on the nut backing plate 41, and the other end passes moving platen and is fixed in the push pedal 11 with connecting rod screw 72.When feed screw nut 4 moves up and down, make push pedal 11 make lifting moving in vertical direction through connecting rod 7.The guiding of push pedal 11 need not common guide pillar but has been adopted ball guide pillar 12, makes guiding smooth and easy.During leading screw 8 rotations, feed screw nut 4 can only be by the motion up and down that is used as of screw thread because 2 connecting rods 7 can not rotate with the restriction of the mating reaction of moving platen, and the guiding of 2 connecting rods 7 is realized by the guide pin bushing on the moving platen 71.
When stepper motor 1 rotation drives thread core 6 rotations; Push pedal 11 is static relatively for moulding 2; The part detent mechanism 3 (referring to Fig. 2) that the location spline must be arranged between part and the push pedal for this reason; In the injection moulding process of reality, the location of moulding is solved by part self geometry, and pit groove etc. for example is set.Can not separate the occasion of decision bit with part self geometry for some; Moulding like pure cylindrical shape; Or in test mechanism; Consider the problem of part and the location spline of push pedal so with regard to needs, usually, can be provided with two positioning convex points in the corresponding moulding of end face 2 bottom surfaces of push pedal 11, the position of correspondence positioning convex point is provided with size and the suitable locating slot of positioning convex point in the bottom of moulding; Make when the base abuts of moulding 2 in 11 last times of push pedal, moulding 2 relative push pedals 11 are static.
Accomplish a screw thread loose core take off action, thread automatically after, push pedal need be returned initial 0 position, i.e. push pedal lower plane and moving platen upper surface applying.This backhaul action is accomplished by the servomotor counter-rotating.Because there is null offset in servomotor, so can get back to 0 initial position during backhaul and need ensuring method.When behind the injection machine matched moulds locked mode time; If because the null offset of servomotor cause reset improper; Make and also have the gap between push pedal and the template; When this gap was extruded under the clamp force effect, huge clamp force will be born by screw mandrel and feed screw nut system, will cause the damage of screw mandrel.If resetting of push pedal accomplished by the counter-rotating revolution of control servomotor merely, then, will produce accumulated error when resetting because there is error in the rotation of servomotor at every turn; It is inaccurate that long-term work also can cause push pedal to reset, and therefore, the utility model increases in push pedal 11 and is used for the travel switch 81 that push pedal resets zero point; The definite of counter-rotating reset position accomplished by travel switch, and referring to Fig. 4, travel switch 81 is contained on the moving platen; Switch contact 82 is contained in the push pedal, and after each thread core was loosed core completion, servomotor need be inverted to the reset position at zero point of push pedal 11; When push pedal dropped to switch contact 82 correspondence course switches 81, travel switch 81 sent signal, and this signal is promptly confirmed the position signalling at zero point as servomotor; During each run; All, can eliminate the accumulated error that servomotor 0 point drift shipper pole comes, guarantee that the push pedal backhaul accurately gets back to initial 0 point with the generation of this signal 0 position as servomotor.
The servo Synchronization Control of the screw thread core-pulling mechanism of the utility model is calculated as follows: establishing injection-moulded plastic part pitch is P, and the stepper motor rotating speed is Nb, and the servomotor rotating speed is Ns, and leading screw pitch is Ps, and the speed reducing ratio of reductor is R.According to Fig. 3 stepper motor transmission mechanism, known stepper motor sprocket wheel and gear shaft sprocket ratio are 1, and the gearratio of gear shaft gear and rotatable core gear also is 1; When therefore stepper motor rotated the Nb circle in the unit interval, part took off screw thread Nb circle, and part is deviate from the distance of a pitch Nb * P; Push pedal simultaneously must also be accomplished and release distance P t; When push pedal is released distance P t=Nb * P and is realized releasing synchronously; Transmission according to the synchronous push pedal of Fig. 2 servomotor system; The leading screw rotation this moment number of turns is Nb * P/ (Ps), and feed screw nut moves axially and is [Nb * P/ (Ps)] * Ps, so the corresponding release distance of push pedal is Pt=[Nb * P/ (Ps)] * Ps; The gearratio of leading screw sprocket wheel and servomotor sprocket wheel is 1, and at this moment the planetary reducer output rotates [Nb * P/ (Ps)] circle, and the rotation number of turns of servomotor is R * [Nb * P/ (Ps)]; Just obtain: Ns=R * [Nb * P/ (Ps)] obtains N thus
s=N
bRP/P
sPart pitch P wherein shows as two numerical value in the reality adjustment: part theoreticalpiston value and part pitch correction value.Synchronous adjustment in actual injection moulding process will mainly depend on part pitch correction value convergence will be adjusted.
Referring to Fig. 5, the job step of the injection mould screw thread core-pulling mechanism of the utility model is following, after system's energising; Detect servomotor and stepper motor and whether can get into duty, be, then data such as input data moulding thread pitch, stepper motor rotating speed, system's gearratio on touch-screen; And select manually or automatic mode, control the system handles data this moment and prepare to receive working signal, when system is received when ejecting signal; PLC control system sends working signal to servomotor, stepper motor simultaneously; Two motors rotate simultaneously, and sync detection device also is set in the system, when the screw thread that detects stepper motor is loosed core the push pedal ejection stroke of stroke and servomotor when asynchronous; System will readjust, and send the rotating speed of pulse command control servomotor.When the screw thread stroke of loosing core finishes, loose core accomplish after, servomotor sends the signal that accomplish the location, PLC control system makes the servomotor counter-rotating, accomplish with positive phase inversion with the pulse number of turns after stopping.If appearance is urgent by the situation of stopping halfway, then stepper motor, servomotor stop operating simultaneously, until pressing SR; Then system control continues to accomplish that set and also uncompleted remaining program, for example, in the process of ejecting promptly by resetting after stopping; Then servomotor continues just going to the work that the core-pulling mechanism completion is loosed core, and counter-rotating resets then, as anxious stopping in push pedal reseting procedure at zero point, occurring; After pressing reset key once more, system continues to cover remaining counter-rotating return stroke.
The utility model is not limited to above embodiment, under the disclosed technology contents of above-mentioned embodiment, can also carry out various variations.Every equivalent structure transformation that utilizes the utility model specification and accompanying drawing content to be done, or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the utility model.
Claims (10)
1. injection mould screw thread core-pulling mechanism; Comprise die cavity, moulding, the thread core in moulding, the push pedal below the moulding; Said thread core connects the rotation core-pulling mechanism, and said push pedal connects ejecting mechanism, also comprises thread core is loosed core and the synchronous PLC synchronous control system of push pedal ejection stroke; It is characterized in that: said ejecting mechanism comprises servomotor, chain wheel pair, feed screw nut pair; Said servomotor connection chain wheel set, chain wheel pair connects feed screw nut pair, and feed screw nut pair connects said push pedal.
2. injection mould screw thread core-pulling mechanism according to claim 1, it is characterized in that: said feed screw nut is provided with connecting rod, and the other end of said connecting rod is fixed in the push pedal.
3. injection mould screw thread core-pulling mechanism according to claim 1, it is characterized in that: moving platen is located at the below of push pedal, on moving platen, is provided with through hole, and through-hole wall is provided with the connecting rod guide pin bushing, and said connecting rod passes the connecting rod guide pin bushing and is fixedly connected with push pedal.
4. injection mould screw thread core-pulling mechanism according to claim 3 is characterized in that: in push pedal, be provided with guide hole, built-in ball guide pillar, an end of said ball guide pillar are fixed on the moving platen bottom.
5. injection mould screw thread core-pulling mechanism according to claim 4 is characterized in that: the bearings at both ends of said screw mandrel is fixed on the base and moving platen of core-pulling mechanism.
6. according to the arbitrary described injection mould screw thread core-pulling mechanism of claim 1 to 5; It is characterized in that: said rotation core-pulling mechanism comprises motor and power transmission shaft; One end of said motor and power transmission shaft is connected through sprocket wheel; The driving gear of the other end constant mesh gear group of said power transmission shaft, the driven gear of engaging tooth wheels is installed in the rotating shaft of thread core.
7. injection mould screw thread core-pulling mechanism according to claim 6, it is characterized in that: said motor is a stepper motor.
8. injection mould screw thread core-pulling mechanism according to claim 6 is characterized in that: said moulding is provided with the part detent mechanism that can make moulding and push pedal static relatively.
9. injection mould screw thread core-pulling mechanism according to claim 8 is characterized in that: said moulding bottom surface is provided with locating slot, and the corresponding moulding of said push pedal end face bottom surface is provided with positioning convex point.
10. injection mould screw thread core-pulling mechanism according to claim 4 is characterized in that: said guide hole is embedded with and the suitable guide pin bushing of said ball guide pillar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120270224U CN202129950U (en) | 2011-07-28 | 2011-07-28 | Thread core pulling mechanism of injection mould |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120270224U CN202129950U (en) | 2011-07-28 | 2011-07-28 | Thread core pulling mechanism of injection mould |
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| Publication Number | Publication Date |
|---|---|
| CN202129950U true CN202129950U (en) | 2012-02-01 |
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ID=45518733
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120270224U Expired - Fee Related CN202129950U (en) | 2011-07-28 | 2011-07-28 | Thread core pulling mechanism of injection mould |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202129950U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102358009A (en) * | 2011-07-28 | 2012-02-22 | 顺德职业技术学院 | Injection mold screw thread core pulling mechanism |
| CN103496113A (en) * | 2013-09-03 | 2014-01-08 | 苏州经贸职业技术学院 | Gear worm plastic mold multi-cavity inner thread core-pulling mechanism |
| CN105965796A (en) * | 2016-05-31 | 2016-09-28 | 永高股份有限公司 | Injection mold bevel gear engaging type eight-head inner thread core pulling mechanism |
-
2011
- 2011-07-28 CN CN201120270224U patent/CN202129950U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102358009A (en) * | 2011-07-28 | 2012-02-22 | 顺德职业技术学院 | Injection mold screw thread core pulling mechanism |
| CN103496113A (en) * | 2013-09-03 | 2014-01-08 | 苏州经贸职业技术学院 | Gear worm plastic mold multi-cavity inner thread core-pulling mechanism |
| CN105965796A (en) * | 2016-05-31 | 2016-09-28 | 永高股份有限公司 | Injection mold bevel gear engaging type eight-head inner thread core pulling mechanism |
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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 |
Granted publication date: 20120201 Termination date: 20160728 |
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| CF01 | Termination of patent right due to non-payment of annual fee |