FR2536009A1 - MOLD CLOSING UNIT OF A PLASTIC INJECTION MACHINE - Google Patents

Abstract

A PROTECTIVE BOX FOR THE MOLD CLOSURE UNIT ENCLOSES A TRANSPORT TABLE 29 SERVING THE TRANSPORT OF AN INJECTION MOLD 21, 21 AND MOVING IN ONE DIRECTION AND IN THE OTHER OF A MOLD LENGTH DURING THE MOLD EXCHANGE. THE INSERTION LOCATION M LOCATED IN FRONT OF THE MOLD TIGHTENING SPACE IS COVERED BY A MIDDLE PART OF A STATIONARY BOX 95, AND THE EMPTY SPACE F LOCATED ALTERNATIVELY TO THE RIGHT AND LEFT OF THE INSERTION LOCATION N BY A SLIDING DOOR OF THE PROTECTION BOX, WHILE A SECOND SLIDING DOOR IS ARRANGED IN COINCIDENCE WITH THE MIDDLE PART OF THE BOX 95.

Description

t 53 XOO 9 Mold closing unit of an injection machine

plastic material.

  The invention relates to a mold closing unit of a plastic injection machine, comprising a transport table which can move horizontally, on a guide support fixed to the mold closing unit, over about half its length on either side of a lateral extension of the mold clamping space, and

  with two places in the direction of travel

  spare parts located one behind the other for parts of an injection mold, which can move, when the transport table is in position in the extension of the mold clamping space, of the table transport in the mold clamping space and vice versa, and comprising

  a protective case fixed to the guide support, covered

  covering the entire travel path of the transport table, including the mold parts, on which

  arranged at least one horizontal movable sliding door-

  and fitted with a covering surface on the loading side.

  In a mold closing unit known to this type (Prospectus by Arburg Maschinenfabrik Hehl & S Chne Gmb H & Co KGD 7298 Lossburg "Erhdhte Wirtschaftlickkeit mit Arburg-Schiebetisch"), the protective boot has a sliding door extending over the whole its length and which,

  in the open position, protrudes from the horizontal projection area

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  zontale of the protective boot to the right or to the left It is therefore necessary to maintain

  relatively large distances between injection machines

  tion which are installed next to each other in a manufacturing workshop.

  This is all the more true as passa-

  Sufficient ges are generally required between machines.

  In addition, a person passing between machines cannot simply predict whether, when and to what extent, a sliding door will exit to the right or to the left of the horizontal projection area of a machine. injection machines are too close together, injuries can even be caused if someone is hit by the edges of a sliding door or even two sliding doors moving in opposite directions, without

be able to depart in time.

  If the transport device of the closing unit

  mold should be used to transfer a pre-injection mold

  duly prepared (adapted) in the standby position, in particular thermally, under these operating conditions, it is preferable to transfer this injection mold from its position

  waiting in the clamping space with the electric lines

  triques and hydraulics already connected for adaptation (see on this subject the patent application No 83 09 991) It is then necessary that the lines extending from a device

  of injection mold temperature can accompany

  gain it from the standby position to the clamping space or vice versa without obstacle, This is not possible with an acceptable size and in a significant way, because of the sliding door which exits alternately towards

  left and right of the vertical projection area

  protective housing shim The area of use of the transport device for the mold closing unit

known is therefore limited.

  The object of the invention is to improve an iron unit

  mold form of the type defined above so as to exclude discomfort and even injuries caused in particular by the exit of the sliding doors, with a reduced bulk

  and expanded possibilities for using the transfer system

  Harbor. This object is achieved thanks to a mold closing unit characterized in that, for each position of the transport table, the reserve location, with its mold part, which is at the location of insertion into the lateral extension of the clamping space, is covered by a central housing part with vertical covering surface constituting a part of the protective housing, that two sliding doors are movable parallel to the vertical covering surface of the central housing part and are adjacent on both sides in the covering position to the vertical covering surface of the middle housing part and that the empty space situated alternately to the right and to the left of the insertion location in the housing

  protection can be covered by one of the two covered doors

  smoothing, the other sliding door being able to be simultaneously transferred to a position coinciding with the middle part of the housing, With such a configuration, the mold closing unit is also suitable for operation in accordance with the request of

  German patent P 3222 828 7, because the introduction of the

  hydraulic and electrical in the protective box, both when the injection mold: it is used in the clamping space and when it is for adaptation on the transport table, is no longer hampered by doors

  sliding out right and left of the pro-

  vertical junction of the protective housing.

  This is particularly valid when, according to another characteristic of the invention, the pipes coming from a temperature setting device are introduced into the protective third bowl at both ends by the profiled rails serving as frame elements for the housing. protection,

  are brought in these profiled rails to the plane of symmetry

  sorts the protective housing and are led from there to the injection molds by freely moving end sections, which can be transferred during the mold exchange without separating the lines from a standby position (adaptation position ) on the transport table in their

  injection position in the clamping space and vice versa.

  The invention will be described in more detail with reference to an exemplary embodiment and to the accompanying drawings, in which: FIG. 1 is a view of the mold closing unit according to arrow A in FIGS. 3 and 4, in section partial (section along the joint plane of the injection mold; protective case open at the end), FIG. 2 is a view of the protective case of the transport table of the mold closing unit, according to the arrow B of FIG. 1, FIG. 3 is a sectional view of the mold closing unit in the region of the transport table, according to arrow B of FIG. 1, the protective housing being cut longitudinally, the FIG. 4 is a top view in section of the mold closing unit according to FIG. 3 without the protective cover of the mold closing unit and without the protective casing covering the transport table, FIG. 5 is an enlarged view of part of Figure 1, partially cut away, Figure 6 is u do not cut along line VI-VI of Figure 5, Figures 7 and 8 are partial views along arrow C of Figure 5, the sliding door on the left (in Figure 2) being in Figure 7 in the first phase of its opening movement and the right sliding door being in FIG. 8 in the covering position, FIGS. 9 and 10 are views similar to FIGS. 7 and 8, in which the sliding doors are in the covering position, Figure 11 is an enlarged perspective view of a rail

  sliding door profile used for control.

  The mold closing unit placed on a base 10 of a ma-

  plastic injection china includes a holder

  stationary mold 17, and a stationary support plate

  (A not shown) The mobile mold holder 18 is mounted

  smoothing on side members 19, 20, which form a frame with the mold holder 17 and the support plate The mold holder 17 and the support plate are centered on slides 12 of the machine base 10 The movable mold holder 18 includes a clamping wall 18 a, a rear wall 18 c and several

  support ribs 18 b transmitting the closing pressure.

  The injection mold 21 or 21 'includes support plates

  extremes 21 a, 21 b, 21 a ', 21 bl, which slightly exceed the

  rest of the mold on two opposite sides The injection mold

  21 or 21 'is fixed in the clamping space by means of bolts

  clamping bolts 25, which can be clamped using cy-

  hydraulic linders The clamping bolts 25 bear behind the support plates 21 a and 21 b of the injection mold 21 An injection unit connected by longitudinal members 43 to sleeves 42 of the stationary mold holder 17, comprising -a laminating cylinder 44, works transversely to the joint plane of the injection mold 21 In the illustrated embodiment, the transport device for the mold closing unit is intended and adapted to transfer an injection mold 21 , 21 'in or outside the clamping space S by two perpendicular path sections, one

  to the other a-a, b-b as part of an information mold exchange

  jection The transport table 29 of the: transport device

  is movable in the closing direction of the iron unit

  mold position on each side of at least the maximum depth of a mold For this purpose, the transport table 29 is mounted mobile by means of a pair of side members 30 in a guide support 31 supported at the machine base 10 and can be driven by a hydraulic cylinder 32 fixed to the guide support 31, the piston rod of which is fixed to the transport table 29 The guide support 31 is fixed to the adjacent slide 12 by a fixing flange 31 a by means of fixing screws 38 and is supported by adjustment devices 13 on a support plate 11 of the machine base 10 As shown in Figure 1 in conjunction with Figure 3, the support plate 11 forms a console, the front wall 11a of which forms an acute angle with the vertical longitudinal wall a of the machine base 10 As can be seen in particular in FIG. 1, the drive cylinder 32 is located between guide rails 30 received in rings 29 a from the transport table In the example embodiment illustrated,

  the transport table 29 has two storage locations

  ve N and M each provided for an entire injection mold 21 or 21 'The injection mold is placed there so that the joint plane is in a vertical plane; it can therefore be transported on the transport table with its

  vertical parting line On the path section b-b, the

  the injection is driven by a chain 55.

  To suit the need in the manufacture of molded parts with inserts, the transport table 29 may however also have two reserve locations M and N each provided for a mold half fitted with inserts In this case, the mold half is arranged so that the joint planes are horizontal and, as a result, the mold halves can be transported on the transport table 29 with their horizontal joint plane When the transport table 29 is moving, its guide rails 30

  slide in holes in the transverse wall 31 b (fi-

gure 3) of the guide support 31.

  The transport table 29 is movable in one direction and in

  the other half of its length in a pro-

  tection, so that the two reserve locations are alternately in front of the clamping space S. The indication "in front of the clamping space S" means that the parting line of the injection mold 21 or 21 ' is approximately at the point of intersection k of the sections of

  paths perpendicular to each other a-a and b-b (Figure 4).

  At all times, the reserve location located in front of the clamping space S, hereinafter referred to as insertion location M, is covered, with the object placed in reserve (injection mold 21 ′ or half of mold d injection fitted with inserts), through a middle part of the stationary housing 95, The empty space

  F (figure 4) in the protective box, located alternately

  to the right and left of the insertion location M, -is covered by a sliding door 96 or 96 'Another identical sliding door 96' or 96 coincides during the exchange of mold with the middle part of the housing 95

  when the other sliding door 96 or 96 'is in posi-

  closing The two sliding doors 96, 965 can

  wind move in the same direction for about a width

  sliding door The sliding doors 96, 961, adja-

  centes in the middle part of housing 95 in the closed position

  can slide on common guide bars 98 fixed by bolts 103 21031 to the extreme parts of the protective housing 95 d, 95 d 'The sliding doors 96 and 96', as well as their command and control devices, being of similar construction and arranged symmetrically to each other with respect to a plane in the halves

  left and right of the protective case, description

  below is essentially limited to the left half of the

  protective case (analogous references with apostro-

  the right half are therefore frequently overlooked) The sliding door 96 is guided on the guide bars 98 by means of ball sliding boots 100, 101, the ball sliding box 100 being provided with a longitudinal slot to pass the support element 99 disposed in the plane of symmetry of the protective boot. All the sliding boxes 100, 101 are fixed on folded edges 96 r of the sliding doors 96 (FIG. 5) The middle part of the boot 95 and the sliding doors 96, 96 ′ provided with windows 96 a and handles 97 are square and include a covering surface 95 a and a

  horizontal section 95 b or 96 b (Figure 1).

  The protective casing comprises as building elements

  two two-section U-shaped rails 93, 94 fixed to the

  mold closing tee The horizontal section 95 b of the

  middle part of housing 95 is fixed to the upper arm

  upper 93 a of the U of the upper profile rail 93 The end parts of the protective boot 95 d, 95 d are supported on the profile rails 93, 94 The parts of the protective boot

  95 d, 95 d 'are connected to the guide support 31 via the

  middle of parts of the protective boot 95 c, 95 c of angled shape, fixed to projections 31 c of the guide support 31 The lower profiled rail 94 is fixed by its back 94 b (Figures 1 and 3) to the mold holder stationary 17 of the mold closing unit The upper profile rail 93 rests

  by its lower U branch 93 b on the upper U branch

  94 has lower profile rail 94 The upper branch

  rieure de U 93 a flush with the surface of the protective housing As seen in particular in FIGS. 1,

  5 and 7 to 10, the switching members 109, 110 for switching

  stationary sensors 111, 112 can be actuated in function

  tion of the movement of the sliding doors 96, 96 'The switching members 109, 110 in the form of switching rollers are mounted on switching arms 109 a, 110 Oa, which, for the switching process, can turn 90 in the switches 111, 112 These switches are arranged behind the central part of the housing 95 Each 2530 o 09 sliding door 96, 96 ′ is provided at its lower edge with a profiled rail 113 folded several times at right angles and thus having a shape approximately in S The switches 111 can be actuated by switching elements 108 each formed by a folded sheet metal strip. Each switching element 108 comprises a switching section 108 a inclined relative to the sliding direction, a middle section 108 b and a

  108 c vertical leg (figure 11) The 108 c legs are already

  centes at the extreme edges of the profile rail 113 and the extreme edges 108 a 'of the switching section 108 a at the intermediate stage 113 c, which is connected to the upper stages 113 a and lower 113 e by vertical bars 113 b and 113 d The switches 112, 112 'can be switched by the lower stage 113 e of the profile rail 113, as shown in particular in FIGS. 7 to 10 The switches 111, 111' and 112, 112 'arranged at different levels are switched in opposite directions when moving the door in the same direction

sliding 96 or 96 '.

  It can be seen from FIGS. 8 to 10 in connection with FIGS. 2 and 5 that the profiled rail 113 extends over almost the entire width of the corresponding sliding door 96, 96 ′ and that its upper stage, adjacent at the edge 96 r, is locked by fixing screws 114 between the edge 96 r

  and the body 100 a of the sliding box 100 (FIG. 5).

  All switches are arranged in a sheet metal cover

  form of tunnel 105, which extends between the two sliding doors

  smoothing 96, 96 'in the closed position and symmetrically with respect to the plane of symmetry s-s of the protective housing

  (Figures 2 and 3 in conjunction with Figures 8 to 10) Y The over-

  flat face of the cover 105 lies in the plane of the edges 96 r, 96 r ′ of the sliding doors 96, 96 ′, as shown in particular in FIGS. 8 to 10 The switches 111, 111; 112,112 ′ are fixed to the longitudinal wall of the cover 105 facing the sliding doors 96, 961 The switches 112, 112 V located on a lower stage are slightly

  shifted towards the plane of symmetry s-s with respect to the commu-

  tators -11, 111 'arranged in an upper stage, the

  mite of the switch 111 or 111 'facing the switching member 109 or 109' ;; flush with the vertical wall 105 a or 105 a 'of the cover 105 The longitudinal wall of the cover 105 facing the sliding doors is crossed by the axes switches, on which are mounted the switching arms 109 a :, 109 a ', 110 a, 110 a' carrying the members

  switch 109, 109 ', 110, 110' When the door

  smoothing 96 or 96 'is closed, the switching member 109 is pressed down by the middle section 108 b or 108 b' of the switching element 108 or 108 ', while the switching member 110 or 110 'is still free outside the profile rail 113 (Figures 8 to 10) In the first phase of the opening movement, the switching element 108 releases the switching member 109 or 109', while the lower stage 113 e of the profiled rail 113 passes over the switching member 110 or 110 ′ and thus presses it down, as

  shows the comparison of Figures 7 and 9.

  In the cover 105 is further provided a device for ver-

  rusting which allows the sliding doors 96, 96 'to be locked in their closed position The locking device comprises locking bars 106, 106'

  can be controlled by cam 29 N of the table

  smoothing 29 For this purpose, the locking bars 106,

  106 'are pivotally mounted on an axis 107 extending parallel

  in conjunction with the direction of the transport table 29 The axle is mounted in parts of the hood wall 105 The locking bar 106 is locked by hooking behind the vertical tab 108 c of the switching element 108 fixed to the profile rail 113 For unlocking, the

  bar 106 or 106 'of cam 29 a by rotating it briefly

  thereby releasing the sliding door 96 or 96 u for the

opening movement.

  A space-saving construction of the shoemaker is ensured by 1 1 the fact that the sliding doors 96, 96 'and the middle part of the shoemaker 95 each have a width corresponding approximately to one third of the length of the protective bootmaker and that the lower edge of the sliding doors 96, 96 'is approximately at the height of the reserve surfaces of the reserve locations N, Mo Besides, FIG. 1 clearly shows that the protective boot is essentially open towards the mold-closing unit and forms with the covers protection 117, 118 of

  the mold closing unit a protective assembly in

  closing the mold closing unit and the transfer table

  port 29 with its injection molds 21, 21 '.

  When the transport table 29 of the mold closing unit is used for the production of parts to be injected with inserts (German patent application 2,421,811) or in connection with

  the injection mold exchange, one of the two doors

  sliders 96 and 96 'cover the empty space F located in the protective housing alternately to the right or left next to the insertion location M, while the other sliding door 96' or 96 coincides with the middle part

  95 before and after the mold exchange, i.e.

  say during normal injection, the two sliding doors

  your 96, 96 'are in the covering position according to the

figure 2.

  Each of the switches 111, 1111, 112, 112 'supplies the electronic control counter with a control signal when the corresponding sliding door 96 or 96' arrives in the covering position, or when it even deviates slightly from the covering position. In this way, a sure control of the systematic actuation of the sliding doors 96, 96 ′ is obtained by control means.

  which, in the event of a fault, completely interrupt

  rement the operation of the mold closing unit.

  Two mechanical control systems are also

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  provided: one of the control systems consists of the fact that, thanks to the arrangement of the two sliding doors in the same plane, only one of the sliding doors 96 and 96 ′ can coincide with the middle part of the boot 95, and the other sliding door 96 ′ or 96 must be in the covering position. The other control system consists in that the cam 29 has, in the right position of the transport table 29 (drawn in solid line at Figure 4) unlocks only the locking bar 106 '(according to the broken line in Figure 5) for the sliding door 96', while for the sliding door

  left 96 no release cam is available.

  This left sliding door 96 cannot be unlocked.

  lée by the cam 29 a only when the transport table 29 has reached its final position on the left, according to the dashed line in Figure 4 and that the cam 29 a has therefore arrived in the region of the locking bar 106 for

the left sliding door 96.

  It is exclusively for technological reasons that the S 113 profile rail according to Figure 11 is provided with both

  ends of switching elements 108 It would function-

  nally sufficient to have a switching element 108

  at the end of the profile rail facing the plane of symmetry

sort s-s.

  The supply of two control signals, by two switches

  counter actuated 111, 112 or 111 ', 112', each time a sliding door 96 or 961 reaches or leaves the covering position, increases safety

  of the counter control function.

  The opening of the sliding door covering the empty space

  F (Figure 4) is thus made impossible in several respects.

  This is of great importance, because experience shows that in the event of an accident, the manufacturer of the mold closing unit is readily asked to give accounts, without him having

2,536,000

  influence on proper operation by the person

  staff of the owner of the mold closing unit.

  Experience shows that in the event of disturbances, the conduc-

  Machine operators always seek unauthorized access to critical areas of the machine's locking unit.

  mold and, to this end, show an extraordinary fantasy

  dinary to find new possibilities of opening the protective boot, When the two injection molds 21, 211 are those which, according to the teaching of the German patent application P 32 22 828, remain connected without interruption by their electrical and hydraulic supply lines with

  their power sources, the profiled rails 93, 94 serve

  wind in the passage of these pipes Thus, the electric pipes

  trques coming from the right (in FIG. 2) and going to the mold 21 ′ and those coming from the left and going to the mold 21 pass in the upper profile rail 93, and the corresponding hydraulic lines pass in the lower profile rail 94, and this up to the region of the plane of symmetry ss From there, the pipes join the injection molds 21-21 'by free terminal sections which, thanks to an appropriate length starting from the point where they leave the rails 93, 94, can accompany molds transported on the path sections to the fittings

a-a and b-b.

  Furthermore, the specific location of cam 29 a in the region of the reserve location N (FIG. 4) ensures that the sliding door is free at this location for movement.

  opening, because the injection mold 21 'being prepared

  ration (adaptation) is put there in reserve This is true, whether this reserve location N is at a given instant to the right or to the left of the insertion location M. The switching arms 110 a, 11 ia 'of the switches 112, 112 'are biased by a torsion spring In a position corresponding to Figures 9 and 10, the switching members

  , 110 ′ are adjacent to the extreme edges of the rails

  strips in S 113 and therefore maintain, thanks to the springs, the

  sliding doors 96, 96 'in cover position.

  The adjustment devices 13 each comprise an adjustment bolt 80 forming a stand and a locking nut 88 a

(figure 1).

  Terminal switches 121 provided with switching pins control the transport movement of the injection mold

  21 or 21 'in the path section b-b.

Claims (10)

Claims.   1 mold closing unit of an injection machine   plastic materials, including a transport table for   before moving horizontally, on a guide support fixed to the mold closing unit, over approximately half of its length on either side of a lateral extension of the mold clamping space, and having, in the direction of movement, two spare locations located one behind the other for parts of an injection mold, which can move, when the transport table is in position in the extension of the space of clamping of the mold, of the transport table in the clamping space of -mold and vice versa, and comprising a protective housing fixed to the guide support, covering the entire path of movement of the transport table, including the parts   mold, on which is disposed at least one sliding door   smoothing device movable horizontally and provided with a covering surface on the loading side, characterized in that, for each position of the transport table, the location   reserve, with its mold part, which is located in the   insertion cement (M) in the lateral extension of the   tightening space (S) is covered by a middle part of   housing (95) with vertical covering surface (95 a)   as part of the protective housing, only two doors-   sliding (96, 96 ') -are movable parallel to the over-   vertical covering face (95 a) of the central housing part (95) and are adjacent on both sides in the covering position to the vertical covering surface (95 a) of the central housing part (95) and that the empty space   (F) located alternately to the right and left of the site-   Insertion ment (M) in the protective box can be covered by one of the two sliding doors (96, 96 '),   the other sliding door can be trans-   fairy in a position coinciding with the middle part housing (95).   2 mold closing unit according to claim 1, characterized in that the sliding doors can move on common guide bars (98), supported on the front parts of the protective boot (95 d, 95 d '), by means of ball sliding boxes (100, 101, 100 ', 101') fixed on edges (96 r) folded at right angles to the sliding doors.   3 mold closing unit according to one of claims   1 and 2, characterized in that the central housing part (95) and the sliding doors (96, 96 ') each provided with a window (96 a, 96 a') are square and have a vertical section (95 a, 96 a, 96 a ') and a horizontal section (95 b, 96 b, 96 b') and that two profiled rails (93, 94) with U-shaped cross section are fixed on the mold closing unit, on which the middle housing part (95) and the protective boot parts (95 d, 95 d ') are supported   connected via parts of the protective boot   tion (95 c, 95 c ') to the guide support (31) of the table transport.   4 mold closing unit according to claim 3, characterized in that a lower profiled rail (94) is fixed by its back (94 b) to the stationary mold holder (17) of the mold closing unit and that the upper profile rail (93)   rests by its lower branch (93 b) on the upper branch   lower (94 a) of the profiled rail (94), the upper branch (93 a) of the upper drofiled rail (93) flush with the surface of the protective housing.   Mold closing unit according to one of the claims   previous, characterized in that switching devices   (109, 109 ', 110, 110') can be operated by commu-   stationary supports (111, 112, 111 ', 112') depending on the movement of the sliding doors (96, 96 '), the sliding doors (96, 96') being each provided on its lower edge with an S-shaped rail (113) and stationary switches (111, 1111) being switchable by switching elements (108) fixed to the profile rail (113) and other stationary switches (112, 112 ') being switchable by a horizontal stage (113 e) of the profiled rail (113) o 6 mold closing unit according to claim 5, characterized in that the switching members (109, 109 ') of some of the stationary switches (111, 111') are switchable in opposite directions switching members (110, 111 ') of the other stationary switches (112, 112') of   so as to generate signals for the command.   7 mold closing unit according to one of claims   and 6, characterized in that the S-shaped rail (113) is adjacent by a horizontal upper stage (113 a) to the horizontal edge (96 r) of the corresponding sliding door (96 or 96 '), on which stage (113 a) rest the bodies (100 a) of   ball slip boots (100, 101, 100 ', 1011).   8 mold closing unit according to one of claims   previous, characterized in that locking bars   ge (106, 106 '), through which the sliding doors (96,   96 ') can be locked in the closed position,   can be controlled by a cam (29 n) from the transfer table   port (29), and that the locking bars (106, 106 ') are pivotally mounted about an axis (107) extending parallel to the direction of movement of the table transport (29).   9 mold closing unit according to one of claims   previous, characterized in that the protective case is open with respect to the mold closing unit and forms with the covers (117, 118) of the closing unit   mold a protective assembly enclosing the iron unit   mold form and the transport table (29) with its mold parts. 18 -   Mold closing unit according to one of the claims   above, characterized in that each of the switching members (110, 1110 ') of the stationary switches (112,   112 ') loaded by springs is adjacent to the rail   spun (113) from a sliding door (96, 96 ') lying in overlapping position.