CN2063873U - Bent axle matched moulds attachment injection machine - Google Patents

Abstract

The utility model relates to a negative relief toggle type injection molding machine for clamping systems. The triangular back pole of the matched moulds attachment of the existing injection machine is reversed by 180 DEG to cause the hinge point of a middle pole and the back pole to be positioned at the outer side of the maximum edge of the back pole; so not only the force amplification ratio of the clamping system is greatly improved, but also the motion characteristic of the clamping system is greatly improved simultaneously; thus, the reduced cylinder diameter or the low oil pressure is utilized to obtain large mold clamping force. The utility model is a negative relief toggle type injection molding machine for clamping systems which has the advantages that the high speed and the stable effect are realized, and the energy can be saved by more than 30%.

Description

Bent axle matched moulds attachment injection machine

The utility model relates to a kind of toggle formula mold closing mechanism injector, particularly a kind of negative relief angle hyperbolic elbow formula mold closing mechanism injector, and it belongs to the rubber-like process equipment.

Ordinary rubber class injection (mo(u)lding) machine is by toggle formula mold closing mechanism 1 base 2, and the injector 3 that can advance or retreat constitutes.The main effect of (see figure 1) toggle formula mold closing mechanism 1 is to open and close and clamping mold, and its structural principle as shown in Figure 2.When the needs matched moulds, at first in mould shifting oil cylinder 10, feed pressure oil, making piston rod 8 drive crosshead 7 advances from left to right, and then the back bar 12 that intermediate bar 13 is driven by 3 rigid triangle that constitute of DBE rotates counterclockwise around pin joint D, outwards expand until the preceding bar 14 that makes and back bar 12E is point articulated, and the hinged moving platen 6 of promotion and preceding bar 14 is along parallel from left to right the moving of four pull bars 15 that is sleeved on 6 four jiaos of the moving platens, until mould 5 clampings the most at last, close when tight at mould 5, back bar 12 is arranged in a linear with preceding bar 14.Four jiaos of two ends by locknut 11 and four pull bars 15 of preceding fixed form 4 and back fixed bar template 9 are fixed, bar 12 moves to matched moulds final position II by matched moulds initial position I after the rigid triangle, the die sinking process is just in time opposite with the matched moulds process, and promptly bar 12 goes to the I position clockwise by the II position after the rigid triangle.(see figure 2).

Each angle and label implication and scope are as follows among Fig. 2:

α-pivot angle 0≤α≤120 °

θ-tiltedly arrange angle θ is 3-5 °

α _Max-maximum pendulum angle.

The e-D point is to A point axis of movement distance.

φ-intermediate bar the AB and the horizontal line angle of cut claim the thrust angle.

φ ₀Thrust angle during-mold closing initial point.

φ _MaxThrust angle during-mold closing terminal point, φ _MaxBe 80-90 °.

150 ° of ψ-matched moulds first motion angle ψ ∠

The So-oil cylinder stroke.

Sm-template stroke.

In the design of injector mold closing mechanism, always wish that it has more energetically amplification, obtain bigger mold clamping force with less cylinder thrust with realization, so not only make the mold closing mechanism compact conformation, size is little and in light weight, can also make lower oil pressure and obtain bigger cylinder thrust, make oil hydraulic system more economical more energy-conservation.Secondly also wish to obtain bigger template stroke Sm with identical oil cylinder stroke So.The 3rd wishes that moving platen 6 has kinetic characteristic preferably at the volley, promptly realizes slow, fast, slow natural speed change die opening and closing process, to reduce die opening and closing shock and vibration at the end.The 4th wishes that short axial dimension is arranged, to reduce machine weight and floor space.But existing hyperbolic elbow formula mold closing mechanism shown in Figure 2 is difficult to obtain unified preferably on above 4.Particularly the amplification characteristic of Zhuan Zhi power and kinetic characteristic are more difficult to get effect preferably.This can and promote from the formula (2) of the formula (1) of the theoretical amplification ratio M of mold closing mechanism power and stroke ratio W obviously to find out the calculating formula (3) of angle φ, (because (2) formula of W is too numerous, so only provide the bigger first half of this formula influence factor, more than various compiling in collaboration with in state-compiled textbook " plastics machinery design " book by South China Science ﹠ Engineering University and Beijing Chemical Engineering College find).

M＝ (DB)/(DE) (Sin（α＋γ＋θ＋φ）)/(Sin（α－θ－β）) (Cosβ)/(Cosφ) （1）

W＝ (Sm)/(So) ＝ (（DE－EC）Cosθ－DECos（αmax＋θ）)/(DBCos（γ＋θ）－Cos（αmax＋γ＋θ）) （2）

φ＝Sin (e－DBSin（α＋γ＋θ）)/(AB) （3）

Since above various in each angle value generally all be given, each section bar length and each edge lengths then become the primary variables of design, consider that the machine length overall can not be long and the restriction of template size, therefore DE and EC length are restricted, so DB edge lengths problem of only remaining back bar 12, from formula (1) as can be seen, behind the DB lengthening, the M value increases, and this is good, but finds out again after DB length increases from formula (2), it is big that the So value becomes, stroke ratio W descends not only and causes the variation of kinetic characteristic but also be bad, and therefore (1) formula and (2) formula are conflicting, difficultly reaches all good effect.Find out from formula (3) in addition, because the γ angle is with on the occasion of substitution (3) formula, φ angle when making the oil cylinder maximum thrust reduces, again as can be known by formula (1), because the φ angle diminishes, denominator term Cos φ becomes big in the formula, and branch subitem Sin(α-γ-θ+φ) diminish, be bad so M is reduced.

We are to be the axle center with pin joint D point in Fig. 2, with the DE limit is abscissa X, and quadrant is a first quartile when setting with pivot angle α die sinking campaign, therefore the relief angle γ that is in inboard, DE limit on the occasion of, then be negative relief angle-γ if relief angle γ is positioned at the outside on DE limit, therefore mold closing mechanism shown in Figure 2 is also referred to as positive relief angle hyperbolic elbow mold closing mechanism.

The purpose of this utility model just is to overcome the above-mentioned shortcoming and defect of existing in prior technology, and provides a kind of amplification ratio M of power and stroke ratio W all than the big and good negative relief angle hyperbolic elbow mold closing mechanism injector of speed characteristics.

Basic principle of the present utility model is reverse 180 ° of bar behind the triangle, and make the pin joint B of bar behind the intermediate bar AB of prolongation and the triangle be positioned at the outside of bar longest edge DE behind the triangle, make the former inboard positive relief angle of relief angle γ change into negative relief angle in the outside, DE limit on the DE limit.

Fig. 1 is positive relief angle toggle mold closing mechanism injector structure principle chart

Fig. 2 is the schematic diagram after Fig. 1 mold closing mechanism is partly simplified

Fig. 3 is the schematic diagram of the simplification of this novel negative relief angle toggle formula mold closing mechanism part

Fig. 4 is injector mold closing mechanism oil cylinder work done figure shown in Figure 1

Fig. 5 is injector mold closing mechanism oil cylinder work done figure shown in Figure 3

Fig. 6 is an injector mold closing mechanism speed characteristic curve shown in Figure 1

Fig. 7 is an injector mold closing mechanism speed characteristic curve shown in Figure 3

Be described below in conjunction with 3 to 7 pairs of the utility model of accompanying drawing:

Main feature of the present utility model is bar 16 behind the different new triangle of the reverse 180 degree formation performances of bar behind the former triangle, see Fig. 3, since behind the triangle bar 16 with prolong after the pin joint B of intermediate bar 17 be positioned at the outside of bar 16 longest edge DE behind the triangle, so with hinged D is the axle center, the DE limit is that the outside relief angle γ of the coordinate system of abscissa is a negative value, promptly-and the length of γ, intermediate bar 17 should make that angle γ guarantees in-5 to-20 degree scopes between the longest edge DE of leg-of-mutton back bar 16 and its hypotenuse DB.(see figure 3)

It is the mould reference axis that the outside, the relief angle γ that the pin joint B of bar 16 and intermediate bar 17 is in the direction of motion on DE limit behind the triangle is positioned at DE, be the four-quadrant of starting point with pivot angle α, the γ value is preferably in-5 to-10 degree scopes and chooses.

The amplification ratio M that a kind of new design is so not only exerted all one's strength theoretically increases, and make mold closing mechanism keep big stroke ratio W and better kinetic characteristic, promptly use than small oil tank or than low oil pressure and obtain bigger mold clamping force, this result can be that formula (1) is found out to formula (3) by analysis in front, because the γ angle with negative value substitution (3) formula after, (3) formula divide in the subitem Sin(α+γ+θ) value diminishes, so molecular change is big, though elongated in intermediate bar 18 length in the denominator, make that denominator also becomes big in the formula, become many greatly in a large number but divide subitem to become in a large number than AB, thereby end product is to make the φ angle become big.Again as can be known, as φ angle value that will be bigger with bear relief angle (γ) value substitution (1) formula then can make its minute subitem increase, and denominator term reduces simultaneously, so can obtain the amplification ratio of the power of maximum by formula (1).In addition as can be known with (2) formula, because each parameter relation is little among each variable quantity of new construction and the W, because (2) the branch subitem of formula and intermediate bar length A B, φ, (γ) irrelevant, and though γ angle influence arranged in the denominator term, but influence very little, therefore, stroke ratio is remained unchanged substantially, still keep original bigger template stroke Sm.In addition as can be seen from Figure 3, all identical as separately first motion condition, be that first motion angle ψ is identical, the mold closing mechanism that should bear relief angle then can be by increasing α max value, making among Fig. 3 a point move to a ' left locates, thereby can make template C point also move left to C ' to locate, and template stroke Sm is increased to some extent, make mould have and bigger open distance and the space that changes the outfit.We also can find out that obviously the utility model has bigger superiority than prior art by Fig. 6 and two kinetic characteristic curves of Fig. 7, ordinate among Fig. 6 Fig. 7 is represented speed v, abscissa is represented the stroke of template 6, Fig. 6 is existing positive relief angle hyperbolic elbow mold closing mechanism kinetic characteristic figure, the speed in the stage casing of its stroke is slower than the originally negative relief angle hyperbolic of Fig. 7 elbow mold closing mechanism speed as seen from Figure 6, thereby this novel existing mold closing mechanism injector has higher movement velocity and higher production efficiency.Rate curve is in ascendant trend and Fig. 6 moves at the end, inertia impact and vibration are arranged during this explanation mold closing, and the approaching more motion of Fig. 7 at the end speed is slow more, thereby more meet slow, fast, slow kinetic characteristic, this is because under identical stroke ratio condition, negative relief angle mold closing mechanism first motion angle ψ is less, and the bigger reason of initial thrust.(see figure 3).

We know by after becoming negative relief angle mold closing mechanism from above-mentioned analysis result, device has the amplification ratio M of maximum, force, this conclusion can from the oil cylinder work done curve map 4 of actual measurement and Fig. 5 be more obvious finds out, the abscissa of Fig. 4 and Fig. 5 represents that oil cylinder stroke So ordinate represents required cylinder thrust, and it encloses area under the curve is exactly its work done figure.Compare more laborsavingly with the existing positive and negative relief angle mold closing mechanism work done figure of Fig. 4 from this negative relief angle mold closing mechanism of Fig. 5, and more energy-conservation, promptly available less cylinder diameter or lower oil pressure obtain bigger cylinder thrust.Can make like this that cylinder sizes reduces, oil hydraulic system simplifies, and makes energy consumption minimum and effect is remarkable.

These results can respectively survey with existing positive relief angle mold closing mechanism from this negative relief angle mold closing mechanism and obtain more abundant checking the correction data.See the following form:

The contrast project

Mold clamping force

The template stroke

Amplification ratio

Initial force

Cylinder thrust

ψ

The final V of die sinking

Existing injector

1000KN

350mm

23.7

9.22KW

65KW

123.2

1.085

The utility model

1000KN

350mm

29

11.4KN

42.5

90.25

0.895

From table, can find out under the prerequisite of identical injection volume, mold clamping force and template stroke, the existing same specification board of the amplification ratio M of this negative relief angle mold closing mechanism injector power is many greatly, thereby reaching that the oil cylinder gross thrust can reduce about 1/3 under the identical mold clamping force 1000KN situation, this means also that cylinder sizes, oil pressure can have and bigger reduce and reduce.And this novel initial force can make greatly die sinking easily and after the die sinking speed increase.The die sinking final speed is little then can be made mold closing noninertia impact at the end and move more steady.Measured data, curve and former theoretical analysis fit like a glove thus, this has illustrated that the existing positive relief angle mold closing mechanism injector of this negative relief angle hyperbolic elbow mold closing mechanism injector all has more in every respect and has improved, and is a kind of high speed more than 30%, novel injector efficiently of can save energy.

Claims (2)

1, a kind of hyperbolic elbow mold closing mechanism injector, it is by base, the toggle formula mold closing mechanism and the injection mechanism that are installed on the base are formed, toggle formula mold closing mechanism again by oil cylinder and with the hinged crosshead of piston rod be connected with crosshead and with the hinged rigid triangle of preceding bar after bar form, fixing with leaning on pull bar and the locknut respectively again back fixed form of bar and preceding bar is connected with preceding fixed form behind the triangle, moving platen is set on 4 pull bars, it is characterized in that leg-of-mutton back bar reverse 180 ° with prolongation after intermediate bar hinged, its pin joint B is positioned at the outside of bar longest edge DE behind the triangle, behind the triangle between bar longest edge DE and its hypotenuse DB angle γ to be in pin joint D be the axle center, be negative angle in the outside four-quadrant that the long limit of DE is an abscissa.

2, according to the described hyperbolic elbow of claim 1 mold closing mechanism injector, it is characterized in that angle γ is between the hinged hypotenuse DB of bar longest edge DE and back fixed form behind the triangle that length should make and intermediate bar is hinged of intermediate bar-(5-20) ° between, preferably γ-choose between (5-20) °.

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