CA1175621A - Die closure unit of an injection moulding machine - Google Patents
Die closure unit of an injection moulding machineInfo
- Publication number
- CA1175621A CA1175621A CA000393758A CA393758A CA1175621A CA 1175621 A CA1175621 A CA 1175621A CA 000393758 A CA000393758 A CA 000393758A CA 393758 A CA393758 A CA 393758A CA 1175621 A CA1175621 A CA 1175621A
- Authority
- CA
- Canada
- Prior art keywords
- coupling
- die
- injection moulding
- piston rod
- machine according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/1742—Mounting of moulds; Mould supports
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/1775—Connecting parts, e.g. injection screws, ejectors, to drive means
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
ABSTRACT
DIE CLOSURE UNIT OF AN INJECTION
MOULDING MACHINE
A coupling means (20), which is disposed within the moulding die (25), connects the ejector plate (27) to the piston rod (21) of the ejector means. The coupling is releasable by means of a member which is guided perpendicular to the coupling axis in a bore (48) formed in the mounting plate (25b). The mounting plate (25b) is guided on guide elements of the die carrier for a replacement movement parallel to the bore (48).
With such a construction, it is possible to replace the hydraulically tightly-clampable moulding die (25) with fewer operational steps amd with a smaller potential opening width for the die closure unit (Figs. 2, 3).
DIE CLOSURE UNIT OF AN INJECTION
MOULDING MACHINE
A coupling means (20), which is disposed within the moulding die (25), connects the ejector plate (27) to the piston rod (21) of the ejector means. The coupling is releasable by means of a member which is guided perpendicular to the coupling axis in a bore (48) formed in the mounting plate (25b). The mounting plate (25b) is guided on guide elements of the die carrier for a replacement movement parallel to the bore (48).
With such a construction, it is possible to replace the hydraulically tightly-clampable moulding die (25) with fewer operational steps amd with a smaller potential opening width for the die closure unit (Figs. 2, 3).
Description
~5~
"DIE CLOSURE UNIT OF AN INJECTION MOULDING
_ MA~INE"
The present invention relates to the die closure unit of a plastics injection moulding machine including a device for ejecting the finished moulding, which device includes a hydraulic piston-and-cylinder unit (hydraulic cylinder), mounted on the movable die carrier, and a coupling mean~ which is mounted on the ejector plate of the injection moulding die and by mean~ of which the piston rod of the hydraulic cylinder is connectable to the ejector plate, whereby at least one coupling element, guided radially relative to the piston rod, is engageable behind a coupling head of the piston rod by the loading of a spring, which coupling element is displaceable from itæ
coupling position by means of an unlooking element in oppoRition to the action of the spring.
In a known device of this type (AT PS 320 192), the coupling between the piston rod and the ejector plate is automatically released by the rearward movement of the piston rod as soon as the e~ector plate has reached its basic rearward position. In such a case, the coupling elements which arè jointly guided by the piston rod run on inclined faces of a sleeve which surrounds the coupling head. This operating principle necessitates a large axial dimension for the coupling means which protrudes beyond the mounting plate in the coupling direction.
It i~ al80 known to provide a die closure unit with a mounting device for alternate mounting or releasing of the injection moulding die on the die carriers (German PS 2 724 020~. When the injection moulding die is changed the clamping pins of the mounting device, acting as the components of the moulding die halve~, are necessarily inserted with the moulding die into the clamping space of the die closure unit~ The moulding die halves are then placed, in a centering manner9 against the clampin~ faces of the die carriers in a movement which is parallel to the closure movem~nt of the injection moulding die. A change of moulding dies of this type presupposes that ths ma~imum opening width of the die carriers is greater, by the length of the clamping pins, than is required for the maximum installation depth of the injection moulding die.
On the basis of the prior art mentionedg the invention seek~
to develop a die closure unit of the above-mentioned type such that the injection ~oulding die may be replaced substantially more quickly and with fewer operational æteps.
According to the invention, this object is achieved in that the unlocking element of the coupling means di~posed within the mounting plate of the in~ection moulding die is actuable by means of a member which is displaceably mounted in a bore which is formed in the mounting plate and extends perpendicular to the coùpling axis~
and in that the lateral edges of the mounting plate abut against guide elements of the die carrier for a ~ubstitution or replacement movement of the injection moulding die parallel to the clamping fa¢e of the die carrier.
.This sclution substantially contains a full integration of th0 coupling means in fa~our of a replacement movement of the inje¢tion moulding die which runs transversely to the coupling axis.
This concept presuppose3 that the unlocking element is actuable in the injection moulding die via a bore which extends transversely to th0 coupling axis.
~7S6;~
In this solution for achieving the object, the die carriers are set at a reciprocal distance which is slightly greater, e.g.
approximately 1 mm greater, than the dimension for the depth of the injection moulding die for the replacement operation of the injeotion 5 moulding die. The injection moulding die is then inserted between the die carrlers as far as a stop in a movement which extends exclusively perpendicular to the coupling axis. In such a case, the injection moulding die is guided on the guide elementæ of the die carriers and on their clamping faces. The coupling rod of the e~ector device is then inserted into the coupling means, incorporated into the injection moulding die, for automatic coupling. If it is necessary to change the moulding die again, the unlo¢king element of the coupling means is first actuated via tne bore formed in the injection moulding die wholly independent of an axial movement of the piston rod of the e~ector device. me uncoupled ooupling rod is then extracted from the injection moulding die. me die carriers are then set at a reciprocal distance which is only slightly greater than the dimension for the depth of the injection moulding die.
~hen, by being guided on the guide elements of the die carriers and by being euided on the clamping faces of these die carriers, the injection moulding die is in turn removed from the clamping space in a direction o~ movement which is perpendicular to the coupling axis, A replacement opexation of this type iB not only easier, it can also be carried out by less technical staff and with fewer operational steps than iB possible with known systems. In addition, there i8 a saving in the dimensions for the hydraulic drive means for the die carriers because an opening width which corresponds to the maximum installation depth of the injection moulding die is only in fact required for the die cloaure unit.
~562~
In many cases, it is advantageous to free, at least for a short tiine, the interior space within the box-like die carrier for the additional incorporation of special units -the coupling rod of the ejector means spanning the interior space. For this purpose, a piston rod portion, serving as a coupling rod, is provided with identical coupling heads on both ends and is connectable, by means of its coupling head remote from the injection moulding die, to a further coupling means which is mounted on another piston rod portion of the ejector means and is identical to the coupling means mounted on the ejector plate.
The method of attaching such a special unit, e.g. in the form of a device for un-screwing threaded cores from the moulding, is described, for example~ in German PS 2 806, 060.
The invention will be described further, by way of example, with reference to the accompanying drawings in which:~
Fig. 1 is a slde elevation of a die closure un1t partly in section;
Figs. 2 and 3 are side and front elevations of the injection moulding die of the die closure unit including a coupling means and de~ice for ejecting the moulding;
Fig. 4 is an enlarged sectional view through the coupling means taken along the line IV-IV in Fig~ 3;
Figs. 5 and 5a illustrate the diametrical coupling elements of the coupling means in co-operation with an unlocking element or eccentric both in and out of the coupling position;
sd/G~ ~4-5~6;~
Figs. 6 and 7 are sectional views through the coupling means, taken along the line VII-VII of Fig. 9, both in and out of the coupling position;
Fie. a is an e~ploded view partly in section of the coupling - 5 means ~sectional view through disc 20a taken along the line YIII-VIII
in Fi~.7);
Fig. g showæ a portion of the piston rod (1~,21) in the region of the second coupling mean6 dispo~ed within the box-like die carrier;
Fig.10 is a view coxrespondin~ to Figs. 6 and 7, but on an enlarged scale, of an alternative arrangement of the coupling means;
Fig~ 11 is an 0nlarged~ partially sectional,view through a portion of the in~ection moulding die, taken along the line XI-XI of Fig. 3 and including the driving device for the unlocking element; and Fig. 12 is a part section through an alternative embodiment of the arrangement of Fig. 11.
Fig. 1 shows the right-hand part of the die cloæure unit - without the piston-and~cylinder unit for the drive of movable die carrier 13 and without the mounting plate which carries this piston-and-cylinder unit and which is supported on machine base 10. A
mounting plate and stationary die carrier 12 are mounted on slide rails 11 of the machine base lOo me piston rod 16 of the piston-and-cylinder unit, mounted on the back of the mountine plate, extendæ
throu~h this mounting plate and abut~ against the pressure absorbing plate 13b of the displaceable die carrier 13 via a pressure transmitting plate 15. me end of the piston rod 16 which strikes against the pressure transmitting plate 15 has a bore 19 formed therein whioh forms the oylinder spa¢es for the piston-and-cylinder unit (hydraulic cylinder) of the device for ejecting the moulding.
7t~
~ 6 A piston rod 18, 21 of this hydraulic cylinder i8 connected to an ejector plate 27 of injection moulding dia 25 via a coupling means 20. The box-lika die carrier 13 is displaceably mounted on tie-rods 14 which are accommodated, at one end, by the mounting plate and, at the other end, by the stationary die carrier 12.
The pressure absorbing plate 13b of the die carrier 13 i8 connected to the clamping plate 13a Or this die carrier 13 ~ia supporting rib~
13c. me injection moulding die 25 comprises a mounting plate 25b on the coupling side, a mounting plate 46 on the mouldine side, a contour plate 25 r~hich is adjacent to the separating plane a-a, a contour support plate 40, two spacers 25a which are disposed symmetricall~ to the coupling axis h-h and define a free space 26 for the ejector plate 27 guided on guide pins 41, an ejector cover plate 28 for anchoring the ejector pins 42, and a shaping plate 44 on the moulding side. The moulding is denoted by the reference numeral 430 In the embodiment shown in the drawings, the piston rod 18, 21 of the device for e~ecting the moulding connects the piston of the hydraulic cylinder of this de~ice to the ejector plate 27 and compris0s two piston rod portion~ 18 and 21.
The piston rod 21 on the moulding die side ha identical coupl~ng heads lb on both ends. With its coupling head 21b remote fxom the in~ection moulding die 25, the piston rod is connectable to a further coupling means mounted on the other piston rod portion 18.
This coupling means i5 identical to the coupling means 20 mounted on the e~ector plate 27. The further coupling means 20 is mounted, with a flange member 18f, on the piston rod portion 18 at the front end by means of securing screw 18h. It is in a mirror-image ~7 disposition relative to the coupling means 20 on the moulding die side. The coupling buttons 21b are each offset from the remaining piston rod portion by means of a respective neck 21a. Each coupling button 21b extends into a truncated cone 21c. When the piston rod 18, 21 is inserted into the coupling means 20, the casing surface cover of this truncated cone 21c abuts against sliding faces 23a of the coupling elements 23, which sliding faces are inclined relative to the coupling axis h-h. ~he diametrically disposed coupling elements 23 of the coupling meana are guided radially rela-tive to 1~ the piston rod 18, 21, and are thereby first pushed radially outwardly by the in-going coupllng head 21b in opposition to the action of ~prings 24. In the coupling positlon, the coupling elements are affected by the loading of the initially tensioned springs 24 and engage behind the coupling head 21b. In such a ca3e, the~e ooupling element~ 23 abut against the neck 21a of the coupllng rod 21. me guide paths 51 for the coupling elements 23 are formed by reces~es in a disc 20a of the coupling mean~ 20, whlch disc is provided with opening 20~ ~Figs.8, 10). The disc 20a is partially sur~ounded by a sleeYe 20a'. The ooil springs 24 whioh load the coupling element~ 23, are each sccommodated in a respective bore 23¢ formed ~n ea¢h coupling ele~ent 23. They abut against the sleeve 20a'. The plate-lik~ coupling elements 23 abut, with one broad side9 against the ejector plate 27 or, respectively~
against the front face of the flange member 18fl A~ can be seen particularly from Figs.69 7 and 10, the guide paths 51 are dzfined by ~egmental remaining regions 20e of the disc 20a which form guide faces 25 for the coupling element~ 23 which are also guided on tbe base face 20h of the disc 20a (Fig.8).
62~
In the case of the coupling means 20 on the moulding die side9 the sleeve 20a' i~ centred in an annular groove formed in the ejector plate 27y as can be seen particularly from Fig~ 4. In the ooupling position9 the coupling head 21b plunges into a central recess 54 formed in the ejector plate 27. The disc 20a is mounted on the ejector plate 27 by means of securing screws 38. The coupling elements 23 are displaceable from their coupling position by means of an unlocking element in opposition to the action of the springs 24.
An eccentrlc 33 may be used as an ~mlocking element (example Ehown in Fig80 1~9 and the left-hand half of the coupling means in the example shown in FigsO 10,11). ~t the rotational axis b-b (Fig.6) which extend~ radially relative to the coupling axis _-h, the eccentric 33 i8 rotationally mounted with one bearing portion 31a in the disc 20aO
As can be seen from Fig.8 (top), the eccentric iB symmetrical on both sides, i.e. has two planes of symmetry o-c and d-d. The eccentric member 33c protrudes between the couplirlg elements 23 into the guide paths 51. By rotating the eccentric 33 about 90 , the eccentric 33 arrives at an unlocked position or a locked position, which positions are shown at the top of Fig~8 and oorre~pond to a ~oupling position or a non-coupling position of the coupling elements 23, a~ shown in Figs. 4 and 5 teach simNlt~neously), in Figs. 6 and 7 and in Fie.10 (again simultaneously). me eccentric member 33b, with its working faces 33c, Is parallepiped-shaped and abuts against the ooupling elements 23 alternately with it~ narrower or wider working faces 33c.
me eccentric 33 is actuable by means of a tool which is inEertable axially in the bearing portion 33a via a bore 48 formed in the mounting plate 25b (Figs. 10, 11, on the left). In such a case, the tool engages with a multi edged profile into an internal edge 33d S~6;2~1L
g of the bearin~ portion 33a. The tool 79 thereby extends through the sleeve 20a' via holes 37. As can be seen from Figs. 6 and 7, two diametrically disposed eccentrics 33 are provided in the coupling means 20. In the example shown in Figs. 10 and 11, the eccentric 33 is installed as an additional unlocking element because the coupling elements 23 there are co~trolled by a differen~ type o meAnsO In the embodiment shown in Figs. 10 and 11, the unlocking element iQ a key 56 mounted in the disc 20a. This key is guided in the segmental remaining regio~ 2Ge of the disc 20a by means of a cylindrical shaft. The key is insertable by means of a driving means between the coupling elements 23 for unlocking purposes in opposition to the action of a coil spring 57, which surrounds the shaft. AR
can be seen from Fig~ll, the dri7inB means 76 is a hydraulic or pneumatic piston-and-cylinder unit whose piston rod, as member 58, is guided iD the bore 48 formed in the mounting plate 25b. ~ pin 59, anchored i~ the disc 20a, extends through a slot 77 formed in the shaft of the key 56 (Fig.10). The portion of the shaft of the key 56 which i5 surrounded by the coil spring 57 protrudes into the free space 55 of the mounting plate 2~ (Figs. 10-12). The cylinder o~
the driving means 76 is formed by a die-piece 62 which is mounted on the clamping plate 13a of the die carrier 13 by means of securing screws 63. The hydraulio or pneumatic cylinder is sealed by a cover 66 which haQ an inlet bore 65 formed therein for the hydraulio or pneumatic medium. After every unlocking stroke, the piston is reset into the basic po~ition by means of a resetting spring 64 which abuts, ~t one end, against a shoulder of the moulded-piece 62 and, at the other end5 against the piston 58a. In the embodiment shown in Figol2~ the driving means 76 comprises a coil 72, which i8 acoommodated in a moulded-piece 70, and an armature 71 which is disposed within the coil 72 and is axially dri~able by me~n~q of 5 induction. The moulded-piece 70 is mounted on the clamping plate 13a of the die carrier by means of mounting screw 63. I~e armature 71 i8 connected to a pln-like member 68, which is resettable by means of spring 67, ~ia a connecting rod 69. The spring is supported on a ring of the member 68 and abuts against an annular shoulder Or the ejector plate.
Gripper projections 78a of hydraulically actuable clamping pins 78 engage behind the mounting plate 25b of the injection moulding die 25 (Fig l). The clamping pins 78 extend through rail-like guide elemente 75 which are detachably mounted on the clamping face of the die carrier 13. The half of the injection moulding die which 18 hydraulically clamped tightly on the die carrier by means of the clamping pins is released in that the hydraulio clamping i8 reduced and the clamping pins 78 are guided by qpring force slightly in the direction of the moulding die 25. By being guided on the guide elements 75 and on the clamping faces of the die carriers 12~ 13, the inJectlon moulding die 25 can then be guided out o~ the clamping space of the die olosure unit in a replacement mo~ement extending perpendlcular to the coupling axis h-h or, i~ the operational steps are reversed, another moulding die may be inserted.
The eccentric 33 is axially secured by means of a radial flange which is held between an annular shoulder 61 (Fig.lO) and the sleeve 20a'.
"DIE CLOSURE UNIT OF AN INJECTION MOULDING
_ MA~INE"
The present invention relates to the die closure unit of a plastics injection moulding machine including a device for ejecting the finished moulding, which device includes a hydraulic piston-and-cylinder unit (hydraulic cylinder), mounted on the movable die carrier, and a coupling mean~ which is mounted on the ejector plate of the injection moulding die and by mean~ of which the piston rod of the hydraulic cylinder is connectable to the ejector plate, whereby at least one coupling element, guided radially relative to the piston rod, is engageable behind a coupling head of the piston rod by the loading of a spring, which coupling element is displaceable from itæ
coupling position by means of an unlooking element in oppoRition to the action of the spring.
In a known device of this type (AT PS 320 192), the coupling between the piston rod and the ejector plate is automatically released by the rearward movement of the piston rod as soon as the e~ector plate has reached its basic rearward position. In such a case, the coupling elements which arè jointly guided by the piston rod run on inclined faces of a sleeve which surrounds the coupling head. This operating principle necessitates a large axial dimension for the coupling means which protrudes beyond the mounting plate in the coupling direction.
It i~ al80 known to provide a die closure unit with a mounting device for alternate mounting or releasing of the injection moulding die on the die carriers (German PS 2 724 020~. When the injection moulding die is changed the clamping pins of the mounting device, acting as the components of the moulding die halve~, are necessarily inserted with the moulding die into the clamping space of the die closure unit~ The moulding die halves are then placed, in a centering manner9 against the clampin~ faces of the die carriers in a movement which is parallel to the closure movem~nt of the injection moulding die. A change of moulding dies of this type presupposes that ths ma~imum opening width of the die carriers is greater, by the length of the clamping pins, than is required for the maximum installation depth of the injection moulding die.
On the basis of the prior art mentionedg the invention seek~
to develop a die closure unit of the above-mentioned type such that the injection ~oulding die may be replaced substantially more quickly and with fewer operational æteps.
According to the invention, this object is achieved in that the unlocking element of the coupling means di~posed within the mounting plate of the in~ection moulding die is actuable by means of a member which is displaceably mounted in a bore which is formed in the mounting plate and extends perpendicular to the coùpling axis~
and in that the lateral edges of the mounting plate abut against guide elements of the die carrier for a ~ubstitution or replacement movement of the injection moulding die parallel to the clamping fa¢e of the die carrier.
.This sclution substantially contains a full integration of th0 coupling means in fa~our of a replacement movement of the inje¢tion moulding die which runs transversely to the coupling axis.
This concept presuppose3 that the unlocking element is actuable in the injection moulding die via a bore which extends transversely to th0 coupling axis.
~7S6;~
In this solution for achieving the object, the die carriers are set at a reciprocal distance which is slightly greater, e.g.
approximately 1 mm greater, than the dimension for the depth of the injection moulding die for the replacement operation of the injeotion 5 moulding die. The injection moulding die is then inserted between the die carrlers as far as a stop in a movement which extends exclusively perpendicular to the coupling axis. In such a case, the injection moulding die is guided on the guide elementæ of the die carriers and on their clamping faces. The coupling rod of the e~ector device is then inserted into the coupling means, incorporated into the injection moulding die, for automatic coupling. If it is necessary to change the moulding die again, the unlo¢king element of the coupling means is first actuated via tne bore formed in the injection moulding die wholly independent of an axial movement of the piston rod of the e~ector device. me uncoupled ooupling rod is then extracted from the injection moulding die. me die carriers are then set at a reciprocal distance which is only slightly greater than the dimension for the depth of the injection moulding die.
~hen, by being guided on the guide elements of the die carriers and by being euided on the clamping faces of these die carriers, the injection moulding die is in turn removed from the clamping space in a direction o~ movement which is perpendicular to the coupling axis, A replacement opexation of this type iB not only easier, it can also be carried out by less technical staff and with fewer operational steps than iB possible with known systems. In addition, there i8 a saving in the dimensions for the hydraulic drive means for the die carriers because an opening width which corresponds to the maximum installation depth of the injection moulding die is only in fact required for the die cloaure unit.
~562~
In many cases, it is advantageous to free, at least for a short tiine, the interior space within the box-like die carrier for the additional incorporation of special units -the coupling rod of the ejector means spanning the interior space. For this purpose, a piston rod portion, serving as a coupling rod, is provided with identical coupling heads on both ends and is connectable, by means of its coupling head remote from the injection moulding die, to a further coupling means which is mounted on another piston rod portion of the ejector means and is identical to the coupling means mounted on the ejector plate.
The method of attaching such a special unit, e.g. in the form of a device for un-screwing threaded cores from the moulding, is described, for example~ in German PS 2 806, 060.
The invention will be described further, by way of example, with reference to the accompanying drawings in which:~
Fig. 1 is a slde elevation of a die closure un1t partly in section;
Figs. 2 and 3 are side and front elevations of the injection moulding die of the die closure unit including a coupling means and de~ice for ejecting the moulding;
Fig. 4 is an enlarged sectional view through the coupling means taken along the line IV-IV in Fig~ 3;
Figs. 5 and 5a illustrate the diametrical coupling elements of the coupling means in co-operation with an unlocking element or eccentric both in and out of the coupling position;
sd/G~ ~4-5~6;~
Figs. 6 and 7 are sectional views through the coupling means, taken along the line VII-VII of Fig. 9, both in and out of the coupling position;
Fie. a is an e~ploded view partly in section of the coupling - 5 means ~sectional view through disc 20a taken along the line YIII-VIII
in Fi~.7);
Fig. g showæ a portion of the piston rod (1~,21) in the region of the second coupling mean6 dispo~ed within the box-like die carrier;
Fig.10 is a view coxrespondin~ to Figs. 6 and 7, but on an enlarged scale, of an alternative arrangement of the coupling means;
Fig~ 11 is an 0nlarged~ partially sectional,view through a portion of the in~ection moulding die, taken along the line XI-XI of Fig. 3 and including the driving device for the unlocking element; and Fig. 12 is a part section through an alternative embodiment of the arrangement of Fig. 11.
Fig. 1 shows the right-hand part of the die cloæure unit - without the piston-and~cylinder unit for the drive of movable die carrier 13 and without the mounting plate which carries this piston-and-cylinder unit and which is supported on machine base 10. A
mounting plate and stationary die carrier 12 are mounted on slide rails 11 of the machine base lOo me piston rod 16 of the piston-and-cylinder unit, mounted on the back of the mountine plate, extendæ
throu~h this mounting plate and abut~ against the pressure absorbing plate 13b of the displaceable die carrier 13 via a pressure transmitting plate 15. me end of the piston rod 16 which strikes against the pressure transmitting plate 15 has a bore 19 formed therein whioh forms the oylinder spa¢es for the piston-and-cylinder unit (hydraulic cylinder) of the device for ejecting the moulding.
7t~
~ 6 A piston rod 18, 21 of this hydraulic cylinder i8 connected to an ejector plate 27 of injection moulding dia 25 via a coupling means 20. The box-lika die carrier 13 is displaceably mounted on tie-rods 14 which are accommodated, at one end, by the mounting plate and, at the other end, by the stationary die carrier 12.
The pressure absorbing plate 13b of the die carrier 13 i8 connected to the clamping plate 13a Or this die carrier 13 ~ia supporting rib~
13c. me injection moulding die 25 comprises a mounting plate 25b on the coupling side, a mounting plate 46 on the mouldine side, a contour plate 25 r~hich is adjacent to the separating plane a-a, a contour support plate 40, two spacers 25a which are disposed symmetricall~ to the coupling axis h-h and define a free space 26 for the ejector plate 27 guided on guide pins 41, an ejector cover plate 28 for anchoring the ejector pins 42, and a shaping plate 44 on the moulding side. The moulding is denoted by the reference numeral 430 In the embodiment shown in the drawings, the piston rod 18, 21 of the device for e~ecting the moulding connects the piston of the hydraulic cylinder of this de~ice to the ejector plate 27 and compris0s two piston rod portion~ 18 and 21.
The piston rod 21 on the moulding die side ha identical coupl~ng heads lb on both ends. With its coupling head 21b remote fxom the in~ection moulding die 25, the piston rod is connectable to a further coupling means mounted on the other piston rod portion 18.
This coupling means i5 identical to the coupling means 20 mounted on the e~ector plate 27. The further coupling means 20 is mounted, with a flange member 18f, on the piston rod portion 18 at the front end by means of securing screw 18h. It is in a mirror-image ~7 disposition relative to the coupling means 20 on the moulding die side. The coupling buttons 21b are each offset from the remaining piston rod portion by means of a respective neck 21a. Each coupling button 21b extends into a truncated cone 21c. When the piston rod 18, 21 is inserted into the coupling means 20, the casing surface cover of this truncated cone 21c abuts against sliding faces 23a of the coupling elements 23, which sliding faces are inclined relative to the coupling axis h-h. ~he diametrically disposed coupling elements 23 of the coupling meana are guided radially rela-tive to 1~ the piston rod 18, 21, and are thereby first pushed radially outwardly by the in-going coupllng head 21b in opposition to the action of ~prings 24. In the coupling positlon, the coupling elements are affected by the loading of the initially tensioned springs 24 and engage behind the coupling head 21b. In such a ca3e, the~e ooupling element~ 23 abut against the neck 21a of the coupllng rod 21. me guide paths 51 for the coupling elements 23 are formed by reces~es in a disc 20a of the coupling mean~ 20, whlch disc is provided with opening 20~ ~Figs.8, 10). The disc 20a is partially sur~ounded by a sleeYe 20a'. The ooil springs 24 whioh load the coupling element~ 23, are each sccommodated in a respective bore 23¢ formed ~n ea¢h coupling ele~ent 23. They abut against the sleeve 20a'. The plate-lik~ coupling elements 23 abut, with one broad side9 against the ejector plate 27 or, respectively~
against the front face of the flange member 18fl A~ can be seen particularly from Figs.69 7 and 10, the guide paths 51 are dzfined by ~egmental remaining regions 20e of the disc 20a which form guide faces 25 for the coupling element~ 23 which are also guided on tbe base face 20h of the disc 20a (Fig.8).
62~
In the case of the coupling means 20 on the moulding die side9 the sleeve 20a' i~ centred in an annular groove formed in the ejector plate 27y as can be seen particularly from Fig~ 4. In the ooupling position9 the coupling head 21b plunges into a central recess 54 formed in the ejector plate 27. The disc 20a is mounted on the ejector plate 27 by means of securing screws 38. The coupling elements 23 are displaceable from their coupling position by means of an unlocking element in opposition to the action of the springs 24.
An eccentrlc 33 may be used as an ~mlocking element (example Ehown in Fig80 1~9 and the left-hand half of the coupling means in the example shown in FigsO 10,11). ~t the rotational axis b-b (Fig.6) which extend~ radially relative to the coupling axis _-h, the eccentric 33 i8 rotationally mounted with one bearing portion 31a in the disc 20aO
As can be seen from Fig.8 (top), the eccentric iB symmetrical on both sides, i.e. has two planes of symmetry o-c and d-d. The eccentric member 33c protrudes between the couplirlg elements 23 into the guide paths 51. By rotating the eccentric 33 about 90 , the eccentric 33 arrives at an unlocked position or a locked position, which positions are shown at the top of Fig~8 and oorre~pond to a ~oupling position or a non-coupling position of the coupling elements 23, a~ shown in Figs. 4 and 5 teach simNlt~neously), in Figs. 6 and 7 and in Fie.10 (again simultaneously). me eccentric member 33b, with its working faces 33c, Is parallepiped-shaped and abuts against the ooupling elements 23 alternately with it~ narrower or wider working faces 33c.
me eccentric 33 is actuable by means of a tool which is inEertable axially in the bearing portion 33a via a bore 48 formed in the mounting plate 25b (Figs. 10, 11, on the left). In such a case, the tool engages with a multi edged profile into an internal edge 33d S~6;2~1L
g of the bearin~ portion 33a. The tool 79 thereby extends through the sleeve 20a' via holes 37. As can be seen from Figs. 6 and 7, two diametrically disposed eccentrics 33 are provided in the coupling means 20. In the example shown in Figs. 10 and 11, the eccentric 33 is installed as an additional unlocking element because the coupling elements 23 there are co~trolled by a differen~ type o meAnsO In the embodiment shown in Figs. 10 and 11, the unlocking element iQ a key 56 mounted in the disc 20a. This key is guided in the segmental remaining regio~ 2Ge of the disc 20a by means of a cylindrical shaft. The key is insertable by means of a driving means between the coupling elements 23 for unlocking purposes in opposition to the action of a coil spring 57, which surrounds the shaft. AR
can be seen from Fig~ll, the dri7inB means 76 is a hydraulic or pneumatic piston-and-cylinder unit whose piston rod, as member 58, is guided iD the bore 48 formed in the mounting plate 25b. ~ pin 59, anchored i~ the disc 20a, extends through a slot 77 formed in the shaft of the key 56 (Fig.10). The portion of the shaft of the key 56 which i5 surrounded by the coil spring 57 protrudes into the free space 55 of the mounting plate 2~ (Figs. 10-12). The cylinder o~
the driving means 76 is formed by a die-piece 62 which is mounted on the clamping plate 13a of the die carrier 13 by means of securing screws 63. The hydraulio or pneumatic cylinder is sealed by a cover 66 which haQ an inlet bore 65 formed therein for the hydraulio or pneumatic medium. After every unlocking stroke, the piston is reset into the basic po~ition by means of a resetting spring 64 which abuts, ~t one end, against a shoulder of the moulded-piece 62 and, at the other end5 against the piston 58a. In the embodiment shown in Figol2~ the driving means 76 comprises a coil 72, which i8 acoommodated in a moulded-piece 70, and an armature 71 which is disposed within the coil 72 and is axially dri~able by me~n~q of 5 induction. The moulded-piece 70 is mounted on the clamping plate 13a of the die carrier by means of mounting screw 63. I~e armature 71 i8 connected to a pln-like member 68, which is resettable by means of spring 67, ~ia a connecting rod 69. The spring is supported on a ring of the member 68 and abuts against an annular shoulder Or the ejector plate.
Gripper projections 78a of hydraulically actuable clamping pins 78 engage behind the mounting plate 25b of the injection moulding die 25 (Fig l). The clamping pins 78 extend through rail-like guide elemente 75 which are detachably mounted on the clamping face of the die carrier 13. The half of the injection moulding die which 18 hydraulically clamped tightly on the die carrier by means of the clamping pins is released in that the hydraulio clamping i8 reduced and the clamping pins 78 are guided by qpring force slightly in the direction of the moulding die 25. By being guided on the guide elements 75 and on the clamping faces of the die carriers 12~ 13, the inJectlon moulding die 25 can then be guided out o~ the clamping space of the die olosure unit in a replacement mo~ement extending perpendlcular to the coupling axis h-h or, i~ the operational steps are reversed, another moulding die may be inserted.
The eccentric 33 is axially secured by means of a radial flange which is held between an annular shoulder 61 (Fig.lO) and the sleeve 20a'.
Claims (10)
1. In a plastics injection moulding machine a die closure unit including a device for ejecting the finished moulding, which device includes a hydraulic piston-and-cylinder unit (hydraulic cylinder) mounted on a movable die carrier, and a coupling means which is mounted on an ejector plate of the injection moulding die and by means of which the piston rod of the hydraulic cylinder is connectable to the ejector plate, whereby at least one coupling element, guided radially relative to the piston rod, is engageable behind a coupling head of the piston rod by the loading of a spring, which coupling element is displaceable from its coupling position by means of an unlocking element in opposition to the action of the spring, characterised in that the unlocking element of the coupling means, which is disposed within a mounting plate of the injection moulding die, is actuable by means of a member which is displaceably mounted in a bore which is formed in the mounting plate and extends perpendicular to the coupling axis, and in that lateral edges of the mounting plate abut against guide elements of the die carrier for a return movement of the injection moulding die parallel to the clamping face of the die carrier.
2. A machine according to claim 1, wherein the unlocking element is a key which is mounted in a disc of the coupling means and is insertable between two diametrically disposed coupling elements by means of a drive means, mounted on the die carrier, in opposition to the action of a spring.
3. A machine according to claim 2, wherein the drive means is a hydraulic or pneumatic piston-and-cylinder unit whose piston rod is guided in the bore formed in the mounting plate.
4. A machine according to claim 2, wherein the drive means includes an armature which is surrounded by a coil, said armature being axially drivable by means of induction forces and being connected, via a connecting rod, to the member which is resettable by means of a spring.
5. A machine according to one of claims 2 to 4, wherein a stationary pin extends through a slot formed in the key, and wherein the shaft of the key, which is surrounded by a coil spring, protrudes into a free space in the injection moulding die.
6. A machine according to claim 1, wherein the unlocking element is an eccentric which is rotatably mounted in a disc of the coupling means and is actuable by means of a tool which is axially insertable into its bearing portion via said bore.
7. A machine according to claim 2, wherein the guide paths for the coupling elements are formed by recesses in a disc of the coupling means, which disc is provided with an opening and is partially surrounded by a sleeve against which the springs of the coupling elements abut.
8. A machine as claimed according to claim 1, wherein the plate-like coupling elements abut against the ejector plate with one broadside, and the coupling head of the coupling rod plunges, in the coupling position, into a central recess formed in the ejector plate.
9. A machine according to claim 1, wherein gripper projections of hydraulically actuable clamping pins reach behind the mounting plate of the injection moulding die, and the clamping pins reach behind the rail-like guide elements mounted on the die carrier,
10. A machine according to claim 1, wherein a coupling rod of the piston rod has identical coupling heads on both ends and is connectable, by means of its coupling head remote from the injection moulding die, to a further coupling means which is mounted on the piston rod portion and is identical to the coupling means mounted on the ejector plate.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3100659 | 1981-01-12 | ||
| DEP3100659.0 | 1981-01-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1175621A true CA1175621A (en) | 1984-10-09 |
Family
ID=6122460
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000393758A Expired CA1175621A (en) | 1981-01-12 | 1982-01-08 | Die closure unit of an injection moulding machine |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS57142338A (en) |
| AT (1) | AT382110B (en) |
| CA (1) | CA1175621A (en) |
| CH (1) | CH655274A5 (en) |
| FR (1) | FR2497721A1 (en) |
| GB (1) | GB2094219B (en) |
| IT (1) | IT1149432B (en) |
| NL (1) | NL8200010A (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3213209C2 (en) * | 1981-12-11 | 1984-04-12 | Karl 7298 Loßburg Hehl | Mold clamping device on a mold clamping unit |
| DE3243991C2 (en) * | 1982-11-27 | 1985-01-10 | Karl 7298 Loßburg Hehl | Mold clamping unit with an ejector drive device |
| US4472128A (en) * | 1983-06-02 | 1984-09-18 | Sharp Die And Mold Co. | Quick change locator clamp assembly for plastic molding machine |
| FR2569605B1 (en) * | 1984-08-31 | 1987-01-30 | Allibert Sa | AUTOMATICALLY RELEASABLE AND CLUTCHABLE COUPLING DEVICE BETWEEN THE MOBILE PLATE AND THE PRESS TOOL EJECTION BATTERY |
| FR2570640B1 (en) * | 1984-09-26 | 1987-03-20 | Vallet Marc | EJECTION HITCH FOR INJECTION PRESS |
| GB2237767A (en) * | 1989-11-09 | 1991-05-15 | Cosgrove Tools Ltd | Moulding machine ejector devices |
| GB2263249B (en) * | 1990-06-29 | 1996-05-29 | Seikosha Kk | Injection molding machines |
| IT248150Y1 (en) * | 1999-11-03 | 2002-12-10 | Sipa Spa | COMMAND BAR FOR MOLD HOLDER PLATE |
| DE102010026832A1 (en) * | 2010-07-12 | 2012-01-12 | Röders Gmbh | Multi-part blow mold, in particular for the production of plastic bottles |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE7240451U (en) * | 1973-03-29 | Crummenerl E Kg | Ejector retraction device for injection molding tools and the like | |
| DE2314243A1 (en) * | 1972-10-03 | 1974-04-18 | Guenter Huetter | DEVICE FOR PREVIEW AND RETRIEVAL OF AN EJECTOR PLATE ON MOLDING TOOLS FOR INJECTION MOLDING MACHINES |
| SE422428B (en) * | 1978-04-27 | 1982-03-08 | Mueller Hans | DEVICE FOR IN CONNECTION WITH THE INSTALLATION OF A MOLDING TOOL E D IN A CORRESPONDING MACHINE, CONNECT AN EMISSION TAP ON THE TOOL WITH AN EXHAUST DEVICE ON THE MACHINE |
| SE426038B (en) * | 1978-11-14 | 1982-12-06 | Hans K Muller | DOUBLE STEP EXTENSORS FOR FORM EXPRESSION TOOLS AND SIMILAR |
| DE2938665C2 (en) * | 1979-09-25 | 1984-05-17 | Krauss-Maffei AG, 8000 München | Clamping device for clamping molded parts of an injection mold on mold mounting plates of a mold clamping device |
| DE3000798C2 (en) * | 1980-01-11 | 1982-09-09 | HASCO-Normalien Hasenclever & Co, 5880 Lüdenscheid | Device for a temporary fixed coupling of mold plates which can be moved relative to one another to at least two parting planes |
| DE3004920A1 (en) * | 1980-02-09 | 1981-08-20 | Theo 7157 Sulzbach Heitkämper | Ejector for injection moulding or pressure die casting dies - where ejector plate is driven by work cylinder via connecting rod |
-
1982
- 1982-01-04 CH CH7/82A patent/CH655274A5/en not_active IP Right Cessation
- 1982-01-04 GB GB8200082A patent/GB2094219B/en not_active Expired
- 1982-01-05 NL NL8200010A patent/NL8200010A/en not_active Application Discontinuation
- 1982-01-07 AT AT0003082A patent/AT382110B/en not_active IP Right Cessation
- 1982-01-08 CA CA000393758A patent/CA1175621A/en not_active Expired
- 1982-01-11 FR FR8200308A patent/FR2497721A1/en active Granted
- 1982-01-11 IT IT19053/82A patent/IT1149432B/en active
- 1982-01-12 JP JP57002350A patent/JPS57142338A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| CH655274A5 (en) | 1986-04-15 |
| IT1149432B (en) | 1986-12-03 |
| JPS57142338A (en) | 1982-09-03 |
| FR2497721B1 (en) | 1985-04-05 |
| IT8219053A0 (en) | 1982-01-11 |
| NL8200010A (en) | 1982-08-02 |
| ATA3082A (en) | 1986-06-15 |
| FR2497721A1 (en) | 1982-07-16 |
| GB2094219A (en) | 1982-09-15 |
| AT382110B (en) | 1987-01-12 |
| GB2094219B (en) | 1985-01-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA1175621A (en) | Die closure unit of an injection moulding machine | |
| CA1184720A (en) | Mechanism for the attachment of interchangeable molds in an injection molding machine | |
| RU2070111C1 (en) | Method and device for moulding lenses | |
| US5908597A (en) | Ejection methods and linkage apparatus for stack molds | |
| NL8502626A (en) | Injection molding for plastic injection molding machine with locking device. | |
| GB2064415A (en) | Mould Closing and Locking Arrangement | |
| US6093361A (en) | Clamp system and method | |
| JPH01130924A (en) | Synthetic-resin injection molding unit having plasticizing cylinder and coupling device for transfer screw | |
| US4819319A (en) | Power chuck retainer for rotating spindle | |
| US6530568B2 (en) | Flush-mount clamping device | |
| US4192616A (en) | Injection unit for injection molding apparatus | |
| US4704078A (en) | Coupling device for an exchangeable working unit in an injection molding machine | |
| CA1253308A (en) | Injection molding unit for an injection molding machine | |
| EP0942821B1 (en) | High speed locking clamp | |
| US4439133A (en) | Turret-type injection-molding machine | |
| US20040052894A1 (en) | Single-component and multi-component injection-molding machine | |
| KR100304237B1 (en) | Tire Structure of Injection Molding Machine | |
| US6132201A (en) | Frameless electric drive for a molding machine | |
| US6129883A (en) | Vertical clamp index machine | |
| CA2026683A1 (en) | Mould closing apparatus for an injection moulding machine | |
| US3736844A (en) | Linear actuator with locking means | |
| EP2216158B1 (en) | Mould with a core assembly, injection moulding-machine comprising the mould and method of manufacturing moulding products by using the machine | |
| JPH0351206B2 (en) | ||
| CN215282960U (en) | Mould for forming anti-counterfeiting air-conditioning packaging box | |
| WO2001047683A1 (en) | Injection mold key lock |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEC | Expiry (correction) | ||
| MKEX | Expiry |