JPH0355287B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an injection molding machine for the preamble of claim 1. That is, the present invention comprises an injection molding unit which is connected to and separated from an injection mold received in a mold opening/closing unit by a hydraulically actuated traveling cylinder, and a rotary drive device which moves the injection molding unit into a plasticizing cylinder of the injection molding unit. a hydraulically actuated injection cylinder for axially driving a transfer screw capable of sliding in the axial direction; a support block having a synthetic resin material feeder and receiving the rear end of the plasticizing cylinder in a form-fitting manner in the bore; The present invention relates to an injection molding machine for synthetic resins, comprising: a fixing means for fixing a plasticizing cylinder in the axial direction within a support block;

[Conventional technology]

In a known injection molding machine of this type (DE 155 4 768), the plasticizing cylinder, together with its supporting block and the part of the machine bed which carries said supporting block, is pivoted so as to be pivotable about a vertical axis. It has been done. During the pivoting operation and also at the end of the pivot, the plasticizing cylinder is supported by rollers on the mold side. No provision is made to release the plasticizing cylinder from the centering abutment of the support block within the framework of automatic exchange of the mold, and such release is not possible. To separate the plasticizing cylinder from the support block, a corresponding disassembly must be carried out.

In the case of another known injection molding machine of this type (JP-A-Sho
55-16719), the support mechanism consists of two clamp-like members interconnected by a removable fastening device. The support ring is slidably mounted on the immovable column of the first support member by sliding bushings via horizontal fixing extensions on both sides of the clamp-like member.

Furthermore, it is known in an injection molding machine for plastics to carry out automatic exchange of a plasticizing unit consisting of a plasticizing cylinder and a transfer screw by means of computer-controlled couplings of the plasticizing cylinder and of the transfer screw (see German Patent Publication No. No. 3229223). In this case, however, the plasticized cylinder together with the support block forms a structural unit which is suitable for replacement as a whole. Therefore, when replacing the plasticizing unit, first the plastic supply device is removed from the support block, and then the structural unit consisting of the plasticizing cylinder and support block is separated from the rest of the injection molding unit and transported. There is a need.

Furthermore, it is known (US Pat. No. 3,068,521) to completely surround the plasticizing cylinder of an injection molding machine for plastics with a cover, in which case the plasticizing cylinder is
It cannot be removed from the support block without being dismantled.

Furthermore, it is known that the rear end of the plasticizing cylinder of an injection molding machine for synthetic resins is provided with an annular ring for engaging the coupling means, but the coupling member is intended for fixed assembly and therefore It cannot be removed depending on the computer program.

[Problem that the invention seeks to solve]

The object of the invention is to be able to improve the support of the plasticizing cylinder with little technical outlay and to remove the plasticizing unit consisting of the plasticizing cylinder and the transfer screw from the injection mold for program-based and computer-controlled exchange. After being separated and released from the support block, it is stably supported on a support member, and then
The object of the present invention is to improve an injection molding machine for synthetic resins of the type mentioned at the outset in such a way that it can be separated from the supporting member without requiring manual separation operations.

[Means for Solving the Problems] The above object is achieved by the features disclosed in the feature description section of claim 1. That is, in the injection molding machine for synthetic resin of the present invention, the fixing means is capable of engaging with the engagement recess 10' of the plasticizing cylinder 10 by being driven in the radial direction via a control device. It is configured as an automatic joint K consisting of a slider 72 and, furthermore, as an auxiliary device for manipulating the plasticizing cylinder during the joining and uncoupling operations to the injection mold, through the retraction movement of the injection molding unit. a stationary first support member G that vertically supports the front part of the plasticizing cylinder separated from the plasticizing cylinder in an axially movable manner; locking means 36f, 36h that locks the rear part of the plasticizing cylinder in the axial direction; When the locking cylinder is axially locked by the locking device and disengaged from the support block 15 by the automatic coupling K, and is released from the support block 15 by a backward release movement of the support block. , and a stationary second support member G' vertically supporting the rear part of the plasticizing cylinder, and the plasticizing cylinder 10 is provided with both support members G,
It is characterized by being configured such that it can be pulled away at least upwardly from G'. Note that the drawing reference numerals appended to the claims are for aiding understanding, and do not mean that the present invention is limited to the illustrated embodiments.

[Effect]

A further advantage of this type of construction is that, if necessary, the plasticizing cylinder released from the support block at the rear can be transported tilted about an axis perpendicular to the injection axis.

Embodiments of the invention are described in the dependent claims.

〔Example〕

The invention will be explained in detail below with reference to the drawings which show examples.

In all embodiments, the mold opening/closing unit F and the injection molding unit are mounted on a machine bed 34 equipped with a tank cover 35 so that the injection axis s-s is horizontal. The injection molding unit is
The injection mold 18 fastened to the mold opening/closing unit F can be joined and separated in the axial direction.
In this case, it is supported by a horizontal support rod 33 so as to be slidable in the axial direction. The support rod 33 is
It is fixed and supported in the axial direction by the immovable mold holder 27 of the mold opening/closing unit F. At a considerable distance from the mold holder, a support yoke 36 is provided which surrounds the support rod 33 in a supported manner by a clamping sleeve 36a. The above-mentioned tightening sleeve is connected to the support yoke 36
is provided at the free end of the vertical leg 36d of the leg 3.
6d are interconnected via horizontal webs 36c. The support yoke is mounted on the support plate 31 of the machine bed 34. Fixed element 36
b, the support yoke 36 is fixed and aligned to the support plate 31. A shaped rail 13 consisting of a U-shaped cross section extends over the axially central part of the plasticizing cylinder 10 . The shaped rail 13 is
It is supplemented by the upper cover plate 13c, forming a square pipe shape together with the upper cover plate 13c, and has an annular groove 1 at the rear.
0' surrounding the entire surface of the plasticizing cylinder 10 at intervals. The plasticizing cylinder 10 is shaped like a rail 1
It is held within the square pipe by a horizontal support web 14 supported on three vertical legs 13b. A horizontal support web rests tangentially on the plasticizing cylinder 10, and the free end of the retaining shaft 14a passes through the support web. The shackle is wrapped around the plasticizing cylinder 10 and secured to the associated support web by screw nuts 14b (FIGS. 10 and 11). Plasticizing unit P consisting of a plasticizing cylinder 10 and a transfer screw 28
is supported on the first support member G via friction reducing means also during the injection operation, ie during axial movement during joining and uncoupling with respect to the injection mold 18. The rear end of the plasticizing cylinder 10 is received in a form-fitting manner in the central bore of a support block 15 with a plastic material supply device (storage tank 29). The plasticizing cylinder 10 can be fixed axially in the support block by means of an automatic coupling k that engages under computer control (FIG. 22).

The automatic coupling k is arranged in the support block diametrically opposite the engagement recess 10' of the plasticizing cylinder 10, and is driven in the radial direction via the computer control device. It is comprised of a pair of sliders (lock bars) 72 that engage with the engagement recess 10' of the plasticizing cylinder 10. The plasticizing cylinder 10, which can be locked axially by means of a locking device, is secured to the support block 15 by a retraction movement (release movement) of the injection molding unit.
can be freed from. The plasticizing cylinder 10, which is supported by the first support member G on the mold side and released from the support block 15, can be supported at the rear so as not to be axially movable by the second support member G'.
This second support member G' essentially consists of the support web 36c of the support yoke 36, and the released plasticizing cylinder is formed by the horizontal web 13 of the form rail 13.
It is placed on the web 36c via a. in this case,
The vertical leg 13b of the above-mentioned rail is connected to the support yoke 36.
It is centered between the support ribs 36e of. The remaining part of the injection molding unit surrounds the support block 15 containing the synthetic resin material feeder and can be moved over the pallet 31 of the machine bed 34 by means of two supports 46 with rollers 38 during the release movement. . In the remaining part, the running cylinder and the injection cylinder are surrounded by a cover 30. During the release movement, the plasticizing unit separated from the rest of the piston 3 is inserted into the locking hole of the shaped rail 13.
It is locked in the axial direction by an immovable hydraulic cylinder 36f that engages with the locking neck shaft of 6h (7th,
Figure 10). Lock cylinder 36f is formed by a bore in web 36c of support yoke 36.
The cylinder is supplied with high-pressure medium via hydraulic line 59 at the correct time, ie at the beginning of replacement of the plasticizing unit P. The locked condition can be released by a return spring which returns the locking piston to its starting position.

The details of the first embodiment shown in FIGS. 1 to 7 will be explained below.

The plasticizing cylinder 10 includes a heating belt 19b,
It includes a nozzle body 19d and a nozzle tip 19n. As a support mechanism for the plasticizing unit P,
A support ring 19h is provided. This support ring is fixed to the plasticizing cylinder 10, i.e.
As for the rear part, it is secured by the annular shoulder of the plasticizing cylinder, and for the front part:
It is secured by a retaining ring 19r. The nozzle body 19d of the plasticizing cylinder is the nozzle body 1
It is concentrically surrounded by a trapezoidal conical cover 19e that covers the end face of the portion 9d. The cover is fixed to the nozzle tip 19n by a retaining ring 19p. The cover 19e is centered at the rear in a support ring 19h for axially drawing out the electrical conductors 19i, 19k (FIG. 5). The first support member G on the mold side includes two support pins 17b extending in the direction of the injection axis s-s. The support pin is arranged essentially symmetrically with respect to the vertical plane of symmetry y-y (FIG. 4) in the through hole 17c of the mounting plate 17 of the injection mold 18 below the injection axis s-s. There is. In this case, the support pin 17b is fixed to a projection 17a of a cast member forming the mounting plate 17 of the injection mold 18. The above protrusion is
It protrudes from the vertical boundary surface of the through hole 17c. Approximately 2/3 of the length of the support pin 17b is received in the projection 17a, and the pin end face is chamfered.
There is a gap between the circumferential surface of the support ring 19h and the edge perpendicular to the injection axis s-s, which is approximately
A sliding surface 19h' forming an angle of 30° is provided.
Thus, the plasticizing cylinder can easily slide onto the chamfered portion of the support pin 17b.

In the position of the injection molding unit corresponding to FIG. 1, the lock piston 36h of the hydraulic cylinder 36f is
is concentric with the lock hole in the web 13a of the shaped rail 13. When replacing the plasticizing unit P, first insert the lock piston 36h into the lock hole of the shaped rail 13 (FIGS. 1, 2, and 7). At the same time, based on the computer program, the plasticizing cylinder 1 is
0 and transfer screw 28 from the rest of the injection molding unit. When separating the plasticizing cylinder 10, a slide (72 in FIG. 24) guided radially in the support block 15 is pushed out of the annular groove 10' of the plasticizing cylinder 10 by hydraulic means. The backward stroke of the running cylinders (70, 71 in FIG. 22) pulls the support block 15 away from the axially locked plasticizing cylinder 10, thus releasing the plasticizing unit from the support block. During the backward stroke of the traveling cylinders 70, 71, the remaining injection molding units are moved rearward by the rolling of the traveling rollers 38 of the support member 46 of the support pallet 31. When released, the plasticizing unit P descends approximately 0.5 mm and rests on the web 36c of the support yoke 36, and is therefore supported by the second support member G'. The descent is such that the plasticizing unit P moves along the axis z-
It is equivalent to a slight tilting movement around z (FIG. 6). When transporting the plasticizing unit P, it is expedient for the gripping mechanism of the carrier to engage the transporting joint 60 of the plasticizing unit P so that the reduced angle position according to FIG. 3 occurs. The plasticizing unit P is
If the injection mold 18 has already been completely pulled out in the axial direction from the through hole 17c by the separation stroke, the above-mentioned tilting operation is not necessary. In this case, the plasticizing unit P can be carried out without being tilted, that is, in a horizontal position.

The second embodiment shown in FIGS. 8 to 20 will be described below.

In the embodiment according to FIGS. 8 to 12, the plasticizing unit P is supported on a first support member G consisting of a shaped plate 39 via running rollers. shape plate 3
9 has a U-shaped cross section and therefore the horizontal web 3
9a and vertical legs 39b. Running roller 3
8 is provided on the inner surface of the vertical leg 39b. In the area of the running rollers 38, the vertical legs 13b are reinforced with reinforcing plates 41. The legs 39b of the shaped plate 39 are covered with a gap by a vertical edge 41a obtained by bending and shifting the reinforcing plate 41 twice. The web 13a of the shaped plate 13 is
It is spaced apart from the lower peripheral surface of the plasticizing cylinder 10 by a distance greater than the diameter of the plasticizing cylinder. A space is thus obtained for the end 11e of the heating coil 11a, the supply conductor 12 and its connection plug 23, which is shielded by the shaped rail 13. 10th
As is clear from the figure, the heating coil 11a is surrounded by a fixing clamp 11c which can be clamped together by a fixing device S. The cover plate 13c of the shaped rail 13 is spaced from the plasticizing cylinder 10 by a distance that approximately corresponds to the distance between the vertical leg 13b and the plasticizing cylinder 10.
The supply port 10'' of the plasticizing cylinder 10 consists of a shaped rail 13 and a cover plate 13c (Fig. 10).
The square pipe ending in is covered on the front side by a support plate 22 and on the rear side by a plug plate 16 carrying a plug 23 of the supply conductor 12 of the resistance heater. The plasticizing unit, which is open at the rear for replacement, is attached to the second support member via the web 13a of the shaped rail 13.
Horizontal web 36 of support yoke 36 forming G'
It is supported by c. The traveling rollers 38 are each
It consists of an immovable support neck shaft 38a and a running ring 38b having a cylindrical running surface. Support cervical shaft 38a
is fixed to the adjacent leg 13d and the reinforcing plate 41 by a coaxial fixed neck shaft. The running ring 38b slightly protrudes downward from the web 13a and rests on the web 39a of the shape plate 39 (first
Figure 1). After carrying out the plasticizing unit P, when a new plasticizing unit taken out from the warehouse is placed on both support members G and G' of the injection molding machine from above, the protruding edge 41a of the reinforcing plate 41 is on the mold side. This new plasticizing unit P is centered on the first support member G. Regarding the rear part, i.e. the second support member
On G', the new plasticizing unit P is centered between the centering ribs 36e (FIG. 7). That is, the first
The projecting edges 41a in the area of the support member G and the centering ribs 36e of the support yoke 36 of the second support member are such that the newly introduced and still free plasticizing unit P can be prevented from moving laterally, for example by improper operation. Prevent it from slipping. The form plate 39 forming the first support member G is connected to the form holder 27 by a fastening element 40 via a plate 39d welded to the leg 39b and the web 39a.

The modified example shown in FIGS. 13 and 14 differs from the second embodiment shown in FIGS. 8-12 with respect to the structure of the reinforcing plate and the shaping plate. The disc 41', which rests on the outer surface of the associated leg 13b of the shaped rail 13, thus serves as a reinforcing plate. The vertical leg 39b' of the substantially triangular support member 39' is covered by the disc 41' for coarse centering.

Another modification example of FIGS. 15 and 16 is that the running roller 3
8 is pivotally supported by the leg 39b' of the support member 39', which is different from the modification shown in FIGS. The running rollers protrude downward from the web 39a', and each
The running surface of the running ring 38b forms the rail 1.
The plasticizing unit P is supported through the web 13a of No. 3. In this case, the disc 41' covers the leg 13b of the shaped rail 13 for coarse centering.

In the case of the modified example shown in FIGS. 17 and 18, both running rollers 38 pivotally supported by legs 39b' are
They are mutually coupled via 4. The plasticizing unit P is supported on the end 44a of the running roll 44 which transitions into the centering flange 44b. For alignment,
The alignment flange 44b is attached to the vertical leg 1 of the shaped rail 13.
Slightly covers 3b.

The modified example in Figs. 19 and 20 is the plasticizing unit P.
This is essentially different from the modified example shown in FIGS. 15 and 16 in that coarse alignment during installation is performed using an alignment edge 39e. The centering edge is bent 90° upwardly from the web 39a'' of the profile plate 39''. Thus, a first portion of the shaped plate is created in which the vertical legs 39b'' are bent downwards from the horizontal webs 39a''. At the other rear of the web 39a'', the centering edge 39e is bent downwards.

21 and 22 show still another embodiment, and FIG. 21 is a side view of an injection molding machine for synthetic resin;
FIG. 22 is a view taken along arrows XX-XX in FIG. 21.

Stationary piston 70 (second
2) is fixed to a support rod 33. Non-rotatable pistons 73 of injection cylinders 73, 74
performs only an axial injection stroke, so
It is connected to a transfer screw 28 (FIG. 22).

The computer-controlled coupling K for axially fixing the plasticizing cylinder 10 to the support block 15 is in accordance with the applicant's West German patent applications P3513411.9 and P3526710.0 in the embodiment shown (for example in FIG. 22). It is configured in the same way as in the case. An injection molding unit as such corresponds to the injection molding unit disclosed in patent application P3447707.1.

[Brief explanation of drawings]

Figures 1 and 2 are partial views of an injection molding machine for synthetic resins with the rear part of the plasticizing cylinder released from the support block and the injection molding unit disassembled from the injection mold, and Figure 3 is a partial view of the plasticizing unit. Figure 4 is a perspective view of the immovable mold holder and the first support member of the injection molding machine for synthetic resin, and Figure 5 is a drawing similar to Figures 1 and 2 at the time of transport, and Figure 5 is a mold of the plasticizing cylinder. An enlarged vertical sectional view of the side end, FIG. 6, taken along the line -
7 is a sectional view taken along the line - in FIG. 2, FIG. 8 is a side view of the second embodiment of the injection molding machine for synthetic resin, and FIG. 9 is a side view of the second embodiment of the injection molding machine for synthetic resin. A drawing similar to FIG. 1 when replacing the plasticizing unit of
10 is an enlarged partial vertical sectional view of the plasticizing cylinder of the second embodiment; FIG. 11 is an enlarged rear view of the plasticizing cylinder of FIG. 10, the associated stationary mold holder and the first support member; 12 is a side view of the front of the device of FIG. 11, and FIGS. 13 to 20 are respectively
Drawings corresponding to FIGS. 11 and 12 of the modified example of the apparatus shown in FIGS. 11 and 12, and FIGS. Figure 22 is XX-XX of Figure 21.
). 10...Plasticizing cylinder, 10'...Annular groove,
15...Support block, 18...Injection mold, 2
8... Transfer screw, 29... Raw material storage tank,
38... Traveling roller (friction reducing means), 70,7
1... Traveling cylinder, 73, 74... Injection cylinder, F... Mold opening/closing unit, G, G'... Supporting member, K... Computer-controlled joint, P... Plasticizing unit, S... Fixing device .

Claims (1)

[Scope of Claims] 1. An injection molding unit that is joined and separated by a hydraulically operated travel cylinder to an injection mold received in a mold opening/closing unit, and a rotary drive device for plasticizing the injection molding unit. A hydraulically actuated injection cylinder for axially driving a transfer screw that can slide in the cylinder in the axial direction, and a support that receives the rear end of the plasticizing cylinder in a form-fitting manner in the bore, which is equipped with a synthetic resin material supply device. A synthetic resin injection molding machine comprising: a block; and a fixing means for fixing the plasticizing cylinder in the axial direction within the support block, wherein the fixing means is connected to the engagement recess 10' of the plasticizing cylinder 10 and the control device. and a slider 72 that can be driven in the radial direction through the slider 72 to engage the engagement recess, and further operates the plasticizing cylinder during joining and separation operations with respect to the injection molding mold. as an auxiliary device for the plasticizing cylinder; locking means 36f, 36h for locking the rear part of the plasticizing cylinder in the axial direction; the plasticizing cylinder is locked in the axial direction by the locking device and disengaged from the support block 15 by the automatic coupling K; Due to the release movement of the support block in the backward direction, the support block 15
a stationary second support member G' which vertically supports the rear part of the plasticizing cylinder when released from said plasticizing cylinder 10;
An injection molding machine characterized in that it is configured to be able to be pulled away from G′ at least upwardly. 2 The second support member G' is a stationary support yoke 36
The first support member G is arranged below the injection axis s-s and symmetrically with respect to the vertical plane of symmetry y-y of the mold holder 17, and extends in the direction of the injection axis s-s. The injection molding machine according to claim 1, characterized in that the injection molding machine comprises a support pin 17b, and a support ring 19h for aligning the plasticizing cylinder 10 rests on the support pin 17b. 3 The first support member G is a U-shaped plate 39;
9';39'' and is fixed to the immovable mold holder 27 of the mold opening/closing unit F, and the plasticizing cylinder 10 is supported by the U-shaped plate 39; 39'; An injection molding machine according to claim 1 or 2, characterized in that: 4. A patent claim further comprising a cylindrical member consisting of a shaped rail 13 and a cover plate 13c forming a lid of the shaped rail, and the cylindrical member surrounds the circumferential surface of the plasticizing cylinder 10 at intervals. The injection molding machine according to any one of the ranges 1 to 3. 5. The first support member G consists of a vertical column 39 supported on the vertical column, with running rollers 38 pivotally supported on the parallel walls of said vertical column, of which one
5. An injection molding machine according to claim 4, characterized in that two walls (39a) cover the shaping rail (13) at a small distance.