CN201824541U - Automatic adjusting system for mould clamping force of electric injection molding machine - Google Patents
Automatic adjusting system for mould clamping force of electric injection molding machine Download PDFInfo
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- CN201824541U CN201824541U CN2010205903863U CN201020590386U CN201824541U CN 201824541 U CN201824541 U CN 201824541U CN 2010205903863 U CN2010205903863 U CN 2010205903863U CN 201020590386 U CN201020590386 U CN 201020590386U CN 201824541 U CN201824541 U CN 201824541U
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Abstract
本实用新型公开了一种电动注塑机锁模力的自动调节系统，四根拉杆穿过静模板、动模板、后模板，静模板固定在拉杆上，五点式曲肘机构连接在动模板和后模板之间，五点式曲肘机构的十字头穿过后模板并套在滚珠丝杆外面，滚珠丝杆由合模电机驱动，后模板通过四个调节螺母与四根拉杆连接，调节螺母与后模板之间装有轴承，调节螺母外周设有齿轮齿，四个调节螺母的中间位置设有一个大齿轮，大齿轮与四个调节螺母的齿轮齿啮合，五点式曲肘机构的十字头、滚珠丝杆穿过大齿轮的中心，调模电机的输出齿轮与大齿轮啮合，调模电机连接注塑机控制系统。本实用新型调模精度高。
The utility model discloses an automatic adjustment system for the clamping force of an electric injection molding machine. Four pull rods pass through a static template, a movable template and a rear template, the static template is fixed on the pull rods, and a five-point toggle mechanism is connected between the movable template and the rear template. Between the rear templates, the cross head of the five-point toggle mechanism passes through the rear template and is set outside the ball screw. The ball screw is driven by the clamping motor. The rear template is connected to four pull rods through four adjusting nuts. Bearings are installed between the rear templates, gear teeth are arranged on the outer periphery of the adjustment nuts, and a large gear is provided in the middle of the four adjustment nuts. The large gear meshes with the gear teeth of the four adjustment nuts. The crosshead of the five-point toggle mechanism 1. The ball screw passes through the center of the large gear, the output gear of the mold adjustment motor meshes with the large gear, and the mold adjustment motor is connected to the control system of the injection molding machine. The utility model has high mold adjusting precision.
Description
Technical field
The utility model relates to the electric injection molding machine field, particularly a kind of automatic regulating system of electric injection molding machine clamp force.
Background technology
Electric injection molding machine folding mould is to adopt servomotor to drive the crosshead motion by ball-screw, and crosshead cooperates with toggle mechanism to rotatablely move and is converted into the linear movement of folding mould direction.At injection and packing stage, the pressure that material is produced in the die cavity is called the mould power that expands, and for making mould not by bloated mould power not separately, machine must apply enough clamp forces to mould.If the clamp force deficiency can cause the mould gap, flash takes place, but can make die deformation too greatly again, cause shorten service life, and make plastic products produce internal stress and unnecessary energy consumption.
Therefore, the clamp force after the matched moulds is a very important parameter, should set accurately, guarantees that again mould adjusting mechanism can realize clamp force accurately.The purpose of mode transfer is that matched moulds produces appropriate clamp force afterwards, and in the mode transfer process, the displacement of moving platen is most important to the accurate control of clamp force size, and it directly influences the size of clamp force.
The mould adjusting mechanism of present hydraulic injection molding machine, hydraulic electric motor control mode transfer is sensitive low poor, the method for adjusting mould complexity, the mode transfer precision is low, can't guarantee to realize clamp force accurately after the mode transfer.In addition, the noise height of generation, the ball-screw life-span is short.
The utility model content
The utility model provides the automatic regulating system of the high electric injection molding machine clamp force of a kind of mode transfer precision in order to overcome the deficiency that above prior art exists.
The purpose of this utility model realizes by following technical scheme: the automatic regulating system of this electric injection molding machine clamp force, it is characterized in that: comprise quiet template, master mold, four pull bars, moving platen, male model, five-point type toggle mechanism, rear pattern plate, ball screw, matched moulds motor and mode transfer motor, described four pull bars pass quiet template, moving platen, rear pattern plate, quiet template is fixed on the pull bar, master mold is fixed on the quiet template, male model is fixed on the moving platen, five-point type toggle mechanism is connected between moving platen and the rear pattern plate, the crosshead of five-point type toggle mechanism is passed rear pattern plate and is enclosed within the ball screw outside, ball screw is by the matched moulds motor-driven, rear pattern plate is connected with four pull bars by four adjusting nuts, between adjusting nut and the rear pattern plate bearing is housed, the adjusting nut periphery is provided with gear teeth, the centre position of four adjusting nuts is provided with a gear wheel, the gear teeth engagement of gear wheel and four adjusting nuts, the crosshead of five-point type toggle mechanism, ball screw passes the center of gear wheel, the output gear of mode transfer motor and gear wheel engagement, the mode transfer motor connects control system for shot machine, the rotating and the duration of runs of control system control mode transfer motor.
More concrete, described five-point type toggle mechanism comprises crosshead and is two first push pieces of symmetry axis, two second push pieces, two the 3rd push pieces, two the 4th push pieces and two the 5th push pieces with the crosshead, crosshead connects first push piece, first push piece connects the centre of second push piece, the two ends of second push piece connect the 3rd push piece and the 4th push piece, the 3rd push piece connects rear pattern plate, and the 4th push piece connects the 5th push piece, and the 5th push piece connects moving platen.
More concrete, described control system comprises computer controller and PLC controller, computer controller connects panel and keyboard, computer controller connects the driver of matched moulds motor by the CAN network, computer controller connects the PLC controller by the CAN network, and the PLC controller connects driver, position sensor, four microstrain pressure sensors of mode transfer motor; Position sensor is installed on the gear wheel, and four microstrain pressure sensors are installed in respectively on four pull bars, and apply 4X10 at the back terminal screw of microstrain pressure sensor
-8Coulombian charge.
The control method of the automatic regulating system of above-mentioned electric injection molding machine clamp force may further comprise the steps:
(1), sets a clamp force F according to different needs at the injection machine panel;
(2), control circuit control mode transfer motor rotation, gear wheel rotates, and adjusts nuts for four and rotates in the same way, rear pattern plate retreats along pull bar, five-point type toggle mechanism, moving platen also move backward along pull bar;
(3), rear pattern plate retreats to run into and stops travel switch, stops travel switch and sends signal for the PLC controller, the mode transfer motor stops, rear pattern plate, five-point type toggle mechanism, moving platen all stop to retreat;
(4), matched moulds motor-driven ball screw rotates, the crosshead that drives five-point type toggle mechanism pushes away forward, five-point type toggle mechanism stretches to the moving platen direction, and is gapped between this moment moving platen and the solid plate;
(5), the matched moulds motor stops;
(6), control circuit control mode transfer motor antiport, gear wheel rotates, and adjusts nuts for four and rotates in the same way, rear pattern plate, five-point type toggle mechanism, moving platen all move forward along pull bar;
(7), the male model of moving platen and the master mold matched moulds of quiet template, make pull bar produce microstrain development length Δ L1, Δ L2, Δ L3, Δ L4, distortion produces static pulling force T1, T2, T3, T4, all can read on the reading table of microstrain pressure sensor;
(8), the PLC controller is by the rotation number of teeth of position sensor monitoring gear wheel, PLC controller fine setting mode transfer motor, thereby the displacement of fine setting moving platen, static pulling force T1, T2, T3, T4 sum that microstrain pressure sensor on four pull bars records equal clamp force F, the PLC controller stops the mode transfer motor, and mode transfer finishes.
The pass that described step (8) clamp force F and gear wheel turn over the number of teeth is F=Kx+C, K is the slope of the function straight line of microstrain development length Δ L and clamp force F, it is a definite value parameter of injection machine, x is the number of teeth that gear wheel turns over, C is the right side-play amount of function straight line, is a definite value parameter of injection machine.
The method that described step (1) is set clamp force F is:
1., the size of clamp force F need determine according to cavity pressure and projected area, must satisfy:
Wherein, P
CPDie cavity average pressure in the-injection moulding process, A
T-injection-molded item projected area;
2., in order to guarantee reliable matched moulds, clamp force F must satisfy, F≤(0.8～0.9) P
H, wherein, P
HThe specified clamp force of-injection machine; (formula 2)
3., clamp force
In the formula, A---pull bar sectional area, Cm
2
E---rod material springform variable, KN/Cm
2
The drawing coefficient of ε---pull bar;
I---four pull bar sequence numbers;
L in the formula---pull bar raw footage;
Δ L---microstrain development length;
If
σ-stress,
(formula 3) tries to achieve clamp force.
After described step (8) mode transfer finished, injection moulding need not mode transfer again with a kind of injection-molded item, and rear pattern plate maintains static, and drove moving platen by five-point type toggle mechanism and carried out die sinking and matched moulds.
The principle of matched moulds process is: when matched moulds motor forward rotation, ball screw drives five-point type toggle mechanism urges moving platen and travels forward.When the die joint of mould contacted, toggle mechanism is not shape being aligned arrangement as yet, and moving platen is subjected to the effect of deformation drag.Matched moulds rotating speed of motor reduction this moment, moment of torsion increase, and the active force that acts on the ball screw is constantly increased, and until being enough to overcome deformation drag, making toggle link become a line and arrange.The strain that moving platen takes place has realized locking to mould.When die sinking, the counter-rotating of matched moulds motor, a line of toggle link is arranged destroyed, and moving platen separates with quiet template and returns initial position, thereby realizes die sinking.
The operating position of toggle mechanism determined by the push rod of fixed dimension, and mould closes each push rod invariant position when tight.Therefore,, the mode transfer device of adjusting distance between moving platen and the quiet template must be arranged, regulate the size of clamp force in order to adapt to the mould of different-thickness.The clamp force of toggle mechanism size is relevant with the predeformation amount size of clamping, and the required clamp force of moulded products is that the meticulous adjustment by the mode transfer device realizes.Mould adjusting mechanism is installed on moving platen or the quiet template, by the adjusting nut position on the adjusting yoke rear pattern plate is moved vertically to regulate the mould clamp force.
As shown in Figure 8, in the matched moulds process, require of the rule variation of the speed of moving platen according to " slow-fast-slow ".At initial period, shifting formwork speed is slow as far as possible, to reduce system shock, to prevent mold damage; In running, require shifting formwork speed high as far as possible, thereby reduce net cycle time, increase work efficiency; Near the stroke end time, the translational speed of moving platen can be impacted thereby avoid mould to be subjected to locked mode infinitely near 0, avoids machine to be subjected to judder and generation impact noise, prolongs its service life.When the toggle mechanism kinematic before terminal point during a certain position, mould is just run into, and toggle mechanism continues motion, forces whole parts generation strain, thereby mould is produced thrust (being clamp force), prevent that the die cavity of mould mould when injecting pressurized melt from opening.
Before close certain the position B of quiet template of moving platen was at a high speed, after the B of position, switch to the torque control model, promoting template with low torque earlier advances, (to position C) is again with low speed high torque locking mould after touching solid plate, after pressure between mould arrives certain value (to position D), speed is limited in null value, and torque remains unchanged substantially.
Mould protection under the matched moulds motor-driven:
Protection to mould in injection molding process is a major issue.Usually the mould precision and the complex structure of injection are expensive.If leave goods or residue in the mould, perhaps the position of inserts is incorrect when using inserts places, and mould carries out locked mode by setting, and mould is sustained damage.
In electric injection molding machine, the matched moulds motor can promote two plates with little moment and carry out trial closing under low speed.Divide three to detect actual moment intervally and do not have and transfinite in the position is protected in low pressure molding, each interval has the different moment higher limit that transfinites, as shown in Figure 7.If detected actual moment exceeds the moment upper limit that sets in advance, just show that trial closing runs into obstacle.Here the moment upper limit of She Zhiing is sent to driver by bus.
Utilize the torque limit function of driver torque mode of operation, protect mould by setting a rational torque limit curve.When the low speed high torque locked mode, surpass limits value as load current, then thinking has foreign matter to hinder locking between the template, and at this moment control system is closed torque output at once, thereby reaches the effect of protection mould.By setting the moment monitoring level of multistage mould protective position, control system can realize the function of mould protection.
In this process; need to consider the mould safeguard measure; as shown in Figure 7; by setting between a detection zone at the position B that closes on quiet template; motor promotes template near quiet template with the low speed low torque, and whether the variation that detects matched moulds motor actual measurement loading moment simultaneously surpasses the setting loading moment defines clear.
The utility model has following advantage with respect to prior art:
The automatic regulating system of this electric injection molding machine clamp force, adopt computer controller, PLC controller that injection machine is carried out accurate mode transfer, matched moulds servomotor and mode transfer servomotor are sensitive low high, guarantee to realize clamp force accurately after the mode transfer, and noise is little, and the ball-screw life-span is long.
Especially large size plastic jetting-moulding device is equipped with this automatic regulating system, once just can finish mode transfer, increases work efficiency, and saves plastic rubber material.
In addition, the utility model also provides formula 1, formula 2, formula 3, helps the technical staff to determine appropriate clamp force.
Description of drawings
Fig. 1 is the automatic regulating system figure of electric injection molding machine clamp force of the present utility model.
Fig. 2 is the left view of rear pattern plate.
Fig. 3 is the control system block diagram.
Fig. 4 is the Automatic adjustment method block diagram.
Fig. 5 is the dynamic pressure profile and the static pressure curve of microstrain pressure sensor, and wherein, the curve of parabolic shape is a dynamic pressure profile.
Fig. 6 is the linear relationship chart of four pull bar Δ L and clamp force F.
Fig. 7 is a matched moulds locking process matched moulds motor torque control curve map.
Fig. 8 is matched moulds locking process speed control curve figure.
The specific embodiment
The utility model is described in further detail below in conjunction with drawings and Examples.
The automatic regulating system of electric injection molding machine clamp force as depicted in figs. 1 and 2, comprise quiet template 1, master mold 2, four pull bars 3, moving platen 4, male model 5, five-point type toggle mechanism 6, rear pattern plate 7, ball screw 8, matched moulds motor 9 and mode transfer motor, four pull bars pass quiet template, moving platen, rear pattern plate, quiet template is fixed on the pull bar, master mold is fixed on the quiet template, male model is fixed on the moving platen, five-point type toggle mechanism is connected between moving platen and the rear pattern plate, the crosshead 10 of five-point type toggle mechanism is passed rear pattern plate and is enclosed within the ball screw outside, ball screw is by the matched moulds motor-driven, rear pattern plate is connected with four pull bars by four adjusting nuts 11, between adjusting nut and the rear pattern plate bearing is housed, the adjusting nut periphery is provided with gear teeth, the centre position of four adjusting nuts is provided with a gear wheel 12, the gear teeth engagement of gear wheel and four adjusting nuts, the crosshead of five-point type toggle mechanism, ball screw passes the center of gear wheel, the output gear 13 of mode transfer motor and gear wheel engagement, the mode transfer motor connects control system for shot machine, the rotating and the duration of runs of control system control mode transfer motor.
Five-point type toggle mechanism comprises crosshead and is two first push pieces of symmetry axis, two second push pieces, two the 3rd push pieces, two the 4th push pieces and two the 5th push pieces with the crosshead, crosshead connects first push piece, first push piece connects the centre of second push piece, the two ends of second push piece connect the 3rd push piece and the 4th push piece, the 3rd push piece connects rear pattern plate, the 4th push piece connects the 5th push piece, and the 5th push piece connects moving platen.
As shown in Figure 3, control system comprises computer controller and PLC controller, computer controller connects panel and keyboard, computer controller connects the driver of matched moulds motor by the CAN network, computer controller connects the PLC controller by the CAN network, and the PLC controller connects driver, position sensor, four microstrain pressure sensors of mode transfer motor; Position sensor is installed on the gear wheel, and four microstrain pressure sensors are installed in respectively on four pull bars, and apply 4X10 at the back terminal screw of microstrain pressure sensor
-8Coulombian charge.
The electric injection molding machine computer controller: adopt agile SV1 F2716 mainboard, computer chip group Intel945GSE+ICH7M uses Windows XP operating system as host computer platform.Panel is 12 cun LCD displays of band touch-screen, and other adds keyboard input, USB interface and standby Ethernet interface.
CAN network: with isolating RS-485 serial ports CAN bus communication interface.
The microstrain pressure sensor is the product of Kistler company.
The control method of the automatic regulating system of above-mentioned electric injection molding machine clamp force may further comprise the steps: as shown in Figure 4,
(1), sets a clamp force F according to different needs at the injection machine panel;
(2), control circuit control mode transfer motor rotation, gear wheel rotates, and adjusts nuts for four and rotates in the same way, rear pattern plate retreats along pull bar, five-point type toggle mechanism, moving platen also move backward along pull bar;
(3), rear pattern plate retreats to run into and stops travel switch, stops travel switch and sends signal for the PLC controller, the mode transfer motor stops, rear pattern plate, five-point type toggle mechanism, moving platen all stop to retreat;
(4), matched moulds motor-driven ball screw rotates, the crosshead that drives five-point type toggle mechanism pushes away forward, five-point type toggle mechanism stretches to the moving platen direction, and is gapped between this moment moving platen and the solid plate;
(5), the matched moulds motor stops;
(6), control circuit control mode transfer motor antiport, gear wheel rotates, and adjusts nuts for four and rotates in the same way, rear pattern plate, five-point type toggle mechanism, moving platen all move forward along pull bar;
(7), the male model of moving platen and the master mold matched moulds of quiet template, make pull bar produce microstrain development length Δ L1, Δ L2, Δ L3, Δ L4, distortion produces static pulling force T1, T2, T3, T4, all can read on the reading table of microstrain pressure sensor;
(8), the PLC controller is by the rotation number of teeth of position sensor monitoring gear wheel, PLC controller fine setting mode transfer motor, thereby the displacement of fine setting moving platen, static pulling force T1, T2, T3, T4 sum that microstrain pressure sensor on four pull bars records equal clamp force F, the PLC controller stops the mode transfer motor, and mode transfer finishes.
The pass that described step (8) clamp force F and gear wheel turn over the number of teeth is F=Kx+C, K is the slope of the function straight line of microstrain development length Δ L and clamp force F, it is a definite value parameter of injection machine, x is the number of teeth that gear wheel turns over, C is the right side-play amount of function straight line, is a definite value parameter of injection machine.
The method that described step (1) is set clamp force F is:
1., the size of clamp force F need determine according to cavity pressure and projected area, must satisfy:
Wherein, P
CPDie cavity average pressure in the-injection moulding process, A
T-injection-molded item projected area;
2., in order to guarantee reliable matched moulds, clamp force F must satisfy, F≤(0.8～0.9) P
H, wherein, P
HThe specified clamp force of-injection machine; (formula 2)
3., clamp force
In the formula, A---pull bar sectional area, Cm
2
E---rod material springform variable, KN/Cm
2
The drawing coefficient of ε---pull bar;
I---four pull bar sequence numbers;
L in the formula---pull bar raw footage;
Δ L---microstrain development length;
If
σ-stress,
After described step (8) mode transfer finished, injection moulding need not mode transfer again with a kind of injection-molded item, and rear pattern plate maintains static, and drove moving platen by five-point type toggle mechanism and carried out die sinking and matched moulds.
Fig. 5 is the pressure performance graph and the pressure static curve of one group of microstrain pressure sensor pull bar when recording locked mode, the stationary value that the static pulling force T of pull bar is the pressure static curve.Draw this method of measuring curve is to adjust a locked mode value of moving platen and quiet template distance at every turn.
Following table 1 is actual four pull bar drawing coefficients, deformation values and values of thrust that record:
When the number of teeth changes, also be that Δ L changes, this will obtain the respective value of technology clamp force F, and the moment of the corresponding mode transfer motor of number of teeth x has different locked mode stress microstrain development length Δ L in different number of teeth distortion.The corresponding locked mode stress of Fig. 6 clamp force F microstrain development length Δ L, the long-pending clamp force F of mould contact surface is directly proportional with automatic mold-adjustment number of teeth x.
Among Fig. 6, the highest straight line is the power output of mode transfer motor, and the second straight line is clamp force F, and the slope of second straight line is exactly K, below four static pulling force T1, T2, T3, T4 that straight line is respectively four pull bars.Point among Fig. 6 is corresponding with the measured data of table 1.Clamp force F=T1+T2+T3+T4.
The above-mentioned specific embodiment is a preferred embodiment of the present utility model; can not limit the utility model; other any change that does not deviate from the technical solution of the utility model and made or other equivalent substitute mode are included within the protection domain of the present utility model.
Claims (3)
1. the automatic regulating system of electric injection molding machine clamp force, it is characterized in that: comprise quiet template, master mold, four pull bars, moving platen, male model, five-point type toggle mechanism, rear pattern plate, ball screw, matched moulds motor and mode transfer motor, described four pull bars pass quiet template, moving platen, rear pattern plate, quiet template is fixed on the pull bar, master mold is fixed on the quiet template, male model is fixed on the moving platen, five-point type toggle mechanism is connected between moving platen and the rear pattern plate, the crosshead of five-point type toggle mechanism is passed rear pattern plate and is enclosed within the ball screw outside, ball screw is by the matched moulds motor-driven, rear pattern plate is connected with four pull bars by four adjusting nuts, between adjusting nut and the rear pattern plate bearing is housed, the adjusting nut periphery is provided with gear teeth, the centre position of four adjusting nuts is provided with a gear wheel, the gear teeth engagement of gear wheel and four adjusting nuts, the crosshead of five-point type toggle mechanism, ball screw passes the center of gear wheel, the output gear of mode transfer motor and gear wheel engagement, the mode transfer motor connects control system for shot machine, the rotating and the duration of runs of control system control mode transfer motor.
2. the automatic regulating system of electric injection molding machine clamp force according to claim 1, it is characterized in that: described five-point type toggle mechanism comprises crosshead and is two first push pieces of symmetry axis, two second push pieces, two the 3rd push pieces, two the 4th push pieces and two the 5th push pieces with the crosshead, crosshead connects first push piece, first push piece connects the centre of second push piece, the two ends of second push piece connect the 3rd push piece and the 4th push piece, the 3rd push piece connects rear pattern plate, the 4th push piece connects the 5th push piece, and the 5th push piece connects moving platen.
3. the automatic regulating system of electric injection molding machine clamp force according to claim 1, it is characterized in that: described control system comprises computer controller and PLC controller, computer controller connects panel and keyboard, computer controller connects the driver of matched moulds motor by the CAN network, computer controller connects the PLC controller by the CAN network, and the PLC controller connects driver, position sensor, four microstrain pressure sensors of mode transfer motor; Position sensor is installed on the gear wheel, and four microstrain pressure sensors are installed in respectively on four pull bars, and apply 4X10 at the back terminal screw of microstrain pressure sensor
-8Coulombian charge.
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| CN2010205903863U CN201824541U (en) | 2010-10-29 | 2010-10-29 | Automatic adjusting system for mould clamping force of electric injection molding machine |
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|---|---|---|---|
| CN2010205903863U CN201824541U (en) | 2010-10-29 | 2010-10-29 | Automatic adjusting system for mould clamping force of electric injection molding machine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102555176A (en) * | 2011-12-12 | 2012-07-11 | 海天塑机集团有限公司 | Method for quickly adjusting mould locking force of bent-elbow-type injection molding machine |
| CN104669566A (en) * | 2013-11-29 | 2015-06-03 | 佛山市顺德区震德塑料机械有限公司 | Two-plate injection molding machine and die assembly structure thereof |
-
2010
- 2010-10-29 CN CN2010205903863U patent/CN201824541U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102555176A (en) * | 2011-12-12 | 2012-07-11 | 海天塑机集团有限公司 | Method for quickly adjusting mould locking force of bent-elbow-type injection molding machine |
| CN102555176B (en) * | 2011-12-12 | 2015-04-22 | 海天塑机集团有限公司 | Method for quickly adjusting mould locking force of bent-elbow-type injection molding machine |
| CN104669566A (en) * | 2013-11-29 | 2015-06-03 | 佛山市顺德区震德塑料机械有限公司 | Two-plate injection molding machine and die assembly structure thereof |
| CN104669566B (en) * | 2013-11-29 | 2017-03-08 | 佛山市顺德区震德塑料机械有限公司 | Two-plate injection machine and its mould-matching structure |
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Legal Events
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|---|---|---|---|
| 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: 20110511 Termination date: 20141029 |
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| EXPY | Termination of patent right or utility model |