Clamping unit and molding machine having such a clamping unit

Abstract

The present invention relates to a clamping unit for a molding machine (2), comprising: a mold clamping plate (4) movable relative to a fixed mold clamping plate (3); at least one first crossbeam (5) extending through the movable mold clamping plate (4) and the fixed mold clamping plate (3); a first clamping force mechanism (7) connecting the first crossbeam (5) to the fixed mold clamping plate (3); and a first locking device (9), wherein the first crossbeam (5) can be locked relative to the movable mold clamping plate (4) by means of the first locking device (9), wherein at least one second crossbeam (6) extending through the movable mold clamping plate (4) and the fixed mold clamping plate (3) is provided, wherein the at least one second crossbeam (6) is preferably connected to the movable mold clamping plate (4) by means of a second clamping force mechanism (8) and can be locked relative to the fixed mold clamping plate (3) by means of at least one second locking device (10).

Description

Technical Field

[0001] The invention relates to a clamping unit for a molding machine, and to a molding machine, in particular an injection molding machine, having such a clamping unit, and to the arrangement of a clamping unit or a molding machine having a provision device. Background Art

[0002] A molding machine can be understood as an injection molding machine, a die-casting machine, a press or the like. It is also possible to imagine a molding machine in which the plasticized molding material is transported to an open molding die.

[0003] Next, the prior art will be summarized with respect to injection molding machines. Similar content also applies to molding machines in general.

[0004] The same type of clamping units for molding machines include:

[0005] - a mold clamping plate movable relative to a fixed mold clamping plate;

[0006] - at least one first crossbeam extending through the movable mold clamping plate and the fixed mold clamping plate;

[0007] - a clamping force mechanism connecting the at least one first cross member to the fixed mold clamping plate; and

[0008] A first locking device, wherein the at least one first transverse member can be locked relative to the movable mold platen by means of the first locking device.

[0009] A corresponding clamping unit is known, for example, from AT 525237 A1.

[0010] In the corresponding clamping units of the prior art, it is known that in order to establish the clamping force, the movable mold clamping plate is mostly connected to the fixed mold clamping plate via four crossbeams, wherein the crossbeams are released from the movable mold clamping plate when the movable mold clamping plate moves and are supported on the fixed mold clamping plate.

[0011] This solution has proven to be advantageous in the prior art, since the inertial masses to be moved with the movable mold platen can be kept as low as possible and the crossbeam does not necessarily have to be moved together with the movable mold platen.

[0012] However, disadvantages of the prior art have shown that, due to the crossbars supported on the fixed mold clamping plate by the clamping mechanism, the accessibility of the clamping region of the fixed mold clamping plate is not optimal.

[0013] Therefore, for example, positioning an insert in a forming mold supported between the mold clamping plates is often a challenge, since accessibility to the forming mold for automated equipment, such as a robot arm, is limited by the crossbars.

[0014] It is also known from the prior art to support the crossbeam on a movable mold clamping plate, so that when the movable mold clamping plate is fully opened, the crossbeam can be lifted from the fixed mold clamping plate, thereby making the forming mold more accessible on the fixed mold clamping plate. Such designs are known, for example, from DE 2812301 A1, DE 10 2010 034 669 A1, EP 3 710 222 B1, or EP 3 655 225 B1.

[0015] However, a disadvantage of this design is the high energy consumption of the molding machine during the injection cycle, since the crossbeam connected to the movable mold clamping plate moves along with the movement of the movable mold clamping plate, which leads to a much higher energy consumption for acceleration and braking during the opening and closing movement due to the greatly increased movable mass. Summary of the Invention

[0016] The object of the present invention is to create a clamping unit for a molding machine, by which the aforementioned disadvantages of the prior art can be at least partially improved and / or the ecological and economic aspects can be improved by ensuring a more energy-efficient operation of the clamping unit and / or by increasing the accessibility of the clamping area of the mold clamping plate of the clamping unit.

[0017] This object is achieved by a clamping unit for a molding machine and a molding machine, in particular an injection molding machine, having such a clamping unit and an arrangement of a clamping unit or a molding machine having a provision device.

[0018] According to the present invention, the clamping unit comprises:

[0019] - a mold clamping plate movable relative to a fixed mold clamping plate;

[0020] - at least one first crossbeam extending through the movable mold clamping plate and the fixed mold clamping plate;

[0021] - a first clamping force mechanism connecting the at least one first cross member to the fixed mold clamping plate; and

[0022] a first locking device, wherein the at least one first transverse beam can be locked relative to the movable mold clamping plate by means of the first locking device;

[0023] In which, at least one second crossbeam is provided passing through the movable mold clamping plate and the fixed mold clamping plate, and the at least one second crossbeam is preferably connected to the movable mold clamping plate by means of a second clamping force mechanism so that it can be locked relative to the fixed mold clamping plate by means of at least one second locking device.

[0024] For the purposes of the present invention, a crossbeam connected to a clamping plate is understood to mean that the respective crossbeam is kinematically coupled to the respective clamping plate such that the respective crossbeam moves with the respective clamping plate or, in the case of a fixed mold clamping plate, remains essentially stationary with the clamping plate. It should be noted, however, that a small relative movement can nevertheless be provided between the respective crossbeam and the thus assigned mold clamping plate, which relative movement, for example, allows the clamping force mechanism to perform a small relative stroke in order to generate the clamping force.

[0025] Since the at least one first crossbeam is connected to the fixed mold clamping plate and the at least one second crossbeam is connected to the movable mold clamping plate, on the one hand, the accessibility to the clamping area of the fixed mold clamping plate in the open position of the clamping unit can be increased in that the fixed mold clamping plate is released by the at least one second crossbeam, thereby forming an area or access to the mold clamping area of the fixed mold clamping plate in a targeted manner.

[0026] On the other hand, the moving mass moving together with the movable mold clamping plate is kept as small as possible by only guiding the at least one second crossbeam together and the at least one first crossbeam being able to remain stationary on the fixed mold clamping plate during the opening movement, whereby the energy requirement for the opening and / or closing movement of the movable mold clamping plate can be reduced and thus the economic and ecological aspects of the clamping unit can be improved.

[0027] It is preferably provided that the side of the fixed mold clamping plate facing the movable mold clamping plate and / or the side of the movable mold clamping plate facing the fixed mold clamping plate is designed as a clamping region for the forming mold.

[0028] By specifically positioning the at least one second cross member, a joint region can be defined between the fixed mold clamping plate and the movable mold clamping plate. Within this joint region, the clamping unit between the movable mold clamping plate and the fixed mold clamping plate can be joined, for example, by a robot arm, into the region released by the at least one second cross member when the clamping unit is opened. This significantly simplifies accessibility in the molding machine, for example, for inserting inserts into the forming mold between injection cycles. Accessibility for larger inserts, which previously were difficult to achieve due to the spacing between the cross members, is also significantly improved.

[0029] The clamping unit according to the invention can find its application and be subsequently installed or implemented by using it in already known embodiments of the prior art, such as those described in the introduction to the description.

[0030] In other words, features described with reference to the prior art can of course also be used in combination with the present invention.

[0031] A molding machine can be understood to be an injection molding machine, a die-casting machine, a press, etc. It is also entirely conceivable that a molding machine in which the plasticized molding material is transported to an open molding die is also conceivable.

[0032] In this document, when referring to plates, this does not necessarily mean flat, planar plates. The plates can also have recesses, elevations, and concave processing of the clamping surfaces for optimized clamping force distribution in the closed state. Designs with stabilizing ribs are also entirely conceivable.

[0033] It can be provided that the clamping force mechanism exerts a force (clamping force) on the crossbeam and thereby supports it on the mold clamping plate.

[0034] It can preferably be provided that the first clamping force mechanism and / or the second clamping force mechanism have at least one, preferably hydraulically operated, pressure pad, which is connected to the at least one first crossbeam and / or to the at least one second crossbeam and rests on the fixed mold clamping plate and / or the movable mold clamping plate for establishing the clamping force.

[0035] It can be provided here that the at least one pressure pad is fixed to the fixed mold clamping plate and / or the movable mold clamping plate in a non-positive, positive or material-locking manner or is pressed or abutted against the fixed mold clamping plate and / or the movable mold clamping plate only by building up the clamping force.

[0036] It can preferably be provided that the at least one pressure pad can be a hydraulic, electrical and / or electrohydraulic pressure pad, which preferably exerts a tensile force on the at least one first crossbeam and / or the at least one second crossbeam in order to apply the clamping force.

[0037] It can preferably be provided that the clamping unit is designed as a two-platen clamping unit.

[0038] It can be provided that the first locking device and / or the second locking device has a preferably split locking nut.

[0039] Preferably, it can be provided that the locking nut has a locking nut part for locking the clamping unit to the at least one first crossbeam and / or the at least one second crossbeam, wherein the locking nut is supported in such a way that the opening and / or closing movement of the locking nut part for locking the clamping unit to the at least one first crossbeam and / or the at least one second crossbeam occurs only in a translational manner.

[0040] It may be provided that at least two first transverse beams and / or at least two second transverse beams are provided.

[0041] Preferably, it is provided that the sum of the first and second crossbeams is four crossbeams. Designs of the clamping unit are also entirely conceivable in which the sum of the first and second crossbeams is two, six or eight crossbeams.

[0042] It may be provided that the at least two first locking devices of the at least two first transverse beams and / or the at least two second locking devices of the at least two second transverse beams comprise a common actuator for actuating the locking devices.

[0043] It can preferably be provided that a synchronization device is provided for connecting the two locking nuts, particularly preferably having a synchronization rod, which synchronization device is constructed to synchronize the movement of the locking nuts of the at least two first locking devices of the at least two first crossbeams and / or the locking nuts of the at least two second locking devices of the at least two second crossbeams.

[0044] It can be provided that the at least one first crossbeam is anchored to the fixed mold platen in a releasable manner by means of a releasable holding device and / or that the at least one second crossbeam is anchored to the movable mold platen in a releasable manner by means of a releasable holding device.

[0045] Preferably, it can be provided that the at least one first crossbeam is supported so as to be pullable toward the side facing away from the movable mold clamping plate by means of a crossbeam pulling device on the fixed mold clamping plate and / or the at least one second crossbeam is supported so as to be pullable toward the side facing away from the fixed mold clamping plate by means of a crossbeam pulling device on the movable mold clamping plate.

[0046] It can be provided that the crossbeam tensioning device has at least one hydraulic piston-cylinder unit.

[0047] By providing a crossbeam pulling device, it can be additionally provided that during the opening movement and / or the open position, the at least one first crossbeam and / or the at least one second crossbeam are pulled out of the area between the fixed mold clamping plate and the movable mold clamping plate through the fixed mold clamping plate and / or the movable mold clamping plate in order to additionally release the area between the respective mold clamping plates.

[0048] By pulling the at least one crossbar out of the joining region between the fixed mold clamping plate and the movable mold clamping plate by means of a crossbar pulling device, into which region the clamping unit between the movable mold clamping plate and the fixed mold clamping plate can be engaged, for example, by a robot arm, accessibility can be significantly facilitated, for example, for inserting inserts into the forming mold between injection cycles in an injection molding machine. Accessibility for larger inserts, which previously were difficult to achieve due to the spacing between the crossbars, is also significantly improved.

[0049] Furthermore, protection is claimed for a molding machine, in particular an injection molding machine, having a clamping unit according to the invention.

[0050] Separately from the first clamping force device and / or the second clamping force device, a rapid stroke device can be provided in order to enable a rapid opening and / or closing movement of the clamping unit compared to the application of the clamping force.

[0051] The rapid stroke device can be actuated, for example, in parallel and / or simultaneously with the crossbar pulling device, wherein, for example, at least one crossbar can be pulled out simultaneously during the opening movement of the clamping unit.

[0052] Furthermore, protection is claimed for an arrangement consisting of a molding machine according to the invention or a clamping unit according to the invention, the clamping unit having at least one providing device Preference is given to handling devices, heating devices and / or conveying devices.

[0053] The supply device can be designed, for example, as a handling device (in particular a robot), a film preparation device (for example, for cutting and / or shaping the inserts), and / or a heating device (for example, an oven for preheating the inserts), and / or a conveying device (for example, a conveyor belt). Other designs of the supply device are also conceivable, for example, for supplying and / or conveying the inserts to the clamping unit, or also for removing and / or further processing (deburring, packaging, etc.) the molded parts produced in the clamping unit.

[0054] The providing device can preferably interact, i.e., can interact functionally, with the forming mold and / or the clamping unit and / or the forming machine installed in the clamping unit. For example, the handling device can interact with the forming mold by removing a finished molded part from the forming mold or inserting an insert into the forming mold. In this way, the exceptional accessibility to the interior of the clamping unit can be particularly effectively utilized.

[0055] Preferably, it can be provided that the at least one providing device is positioned on the side of the clamping unit on which the at least one second crossbeam is positioned. In other words, the at least one providing device can be arranged next to the clamping unit.

[0056] By means of appropriate positioning, it can be provided that the area between the provision device and the fixed mold clamping plate (and the mold part positioned thereon) is released in the open position of the clamping unit by at least one second crossbar, which moves together with the movable mold clamping plate and is spaced apart from the fixed mold clamping plate, thereby significantly facilitating accessibility, for example, for inserting inserts into the mold between injection cycles in an injection molding machine. For example, it can also be provided that a crossbar tensioning device is provided, by which accessibility (for example, for inserting inserts into the mold between injection cycles in an injection molding machine) can be further simplified.

[0057] Particularly in the application areas of clamping units with a limited structural space in terms of height (for example when using corresponding clamping units in low workshops), this results in the major advantage of better lateral access to the area between the fixed mold clamping plate and the movable mold clamping plate.

[0058] It can also be provided that the at least one providing device is positioned above the clamping unit, in particular above the fixed mold clamping plate, preferably the at least one second crossbeam is positioned on the side of the clamping unit facing the at least one providing device. In other words, the at least one providing device can be arranged on the clamping unit (see for example Figure 18 and Figure 19 ). By means of a corresponding design, for example, in combination with the provision device, a particularly narrow construction of the clamping unit can be achieved, which has a favorable effect on the installation space with respect to the required placement surface.

[0059] At least one intermediate plate may be provided. This at least one intermediate plate may, for example, be positioned between a fixed mold clamping plate and a movable clamping plate and may be configured to be movable relative to the fixed mold clamping plate. In particular, the intermediate plate is not configured or understood as a fixed mold clamping plate or a movable mold clamping plate. Provision may be made for at least a portion of the forming mold to be arranged or to be arranged on the at least one intermediate plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Further details and advantages of the present invention will be explained in detail below with reference to the exemplary embodiments shown in the drawings using the description of the drawings.

[0061] Figure 1 An embodiment of a forming machine is shown;

[0062] Figures 2 to 5 A first embodiment of a clamping unit according to the invention is shown;

[0063] Figures 6 to 9 A second embodiment of the clamping unit according to the invention is shown;

[0064] Figures 10 to 13 A third embodiment of a clamping unit according to the invention is shown;

[0065] Figure 14 and Figure 15 A fourth embodiment of a clamping unit according to the invention is shown;

[0066] Figure 16 and Figure 17 A fifth embodiment of a clamping unit according to the invention is shown;

[0067] Figure 18 and Figure 19 A sixth exemplary embodiment of a clamping unit according to the invention is shown. DETAILED DESCRIPTION

[0068] exist Figure 1 The molding machine 2 shown by way of example in FIG has an injection unit 21 and a clamping unit 1, which are arranged together on a machine frame 15. Alternatively, the machine frame 15 can also be constructed in multiple parts.

[0069] The shown clamping unit 1 is a clamping unit 1 for a molding machine 2 known from the prior art according to one exemplary embodiment. Figure 1 This embodiment variant is implemented as a two-platen clamping unit 1 .

[0070] In this case, the fixed mold platen 3 is arranged stationary on the machine frame 15 , while the movable mold platen 4 is supported on the machine frame 15 by means of guides 16 so as to slide relative to the fixed mold platen 3 .

[0071] The guide 16 can be designed, for example, as a sliding guide and / or as a rail guide.

[0072] The movable mold platen 4 can be moved for the opening and closing movement by means of a piston-cylinder unit 22 which serves as a rapid-travel device.

[0073] In order to apply the clamping force between the fixed mold clamping plate 3 and the movable mold clamping plate 4 , the movable mold clamping plate 4 is locked relative to the fixed mold clamping plate 3 by means of a locking device 9 having a crossbar 5 and a locking nut 12 .

[0074] In this exemplary embodiment, the locking nut 4 is arranged on the fixed side of the movable mold platen 4 .

[0075] The cross member 5 of this exemplary embodiment is connected to the fixed mold platen 3 via a clamping force mechanism 7 having a pressure pad 11 .

[0076] After the movable mold clamping plate 4 is locked relative to the fixed mold clamping plate 3, the tensile force can be transmitted to the crossbeam 5 via the pressure pad 11 on the fixed mold clamping plate 3, which pulls the movable mold clamping plate 4 relative to the fixed mold clamping plate 3 via the locking nut 12 and thus applies the clamping force and / or pressure to the forming mold 17 (not shown in this embodiment for reasons of clarity), which can be arranged between the mold clamping plates 3 and 4.

[0077] The mold halves of the forming mold 17 can be clamped or mounted on a fixed mold clamping plate 3 and a movable mold clamping plate 4 (shown in dashed lines).

[0078] exist Figure 1 The shaping mold 17 shown closed in FIG. 1 has at least one cavity. An injection channel opens into the cavity, through which the plasticized material of the plasticizing unit 23 can be supplied.

[0079] The injection unit 21 of this embodiment has a material cylinder 24 and an injection screw arranged in the material cylinder 24. The injection screw is rotatable about its longitudinal axis and is movable axially along the longitudinal axis in the conveying direction.

[0080] These movements are driven by a schematically shown drive device 25. Preferably, the drive device 25 comprises a rotary drive device for the rotary movement and a linear drive device for the axial injection movement.

[0081] Figure 1 A molding machine 2 is shown having an injection unit 21 , wherein the injection unit 21 shown in this exemplary embodiment has an injection screw which also serves to plasticize the material to be plasticized (and therefore also forms the plasticizing unit 23 of the molding machine 2 ).

[0082] The plasticizing unit 23 (and therefore the injection unit 21 ) is connected in terms of signaling to a control or regulating unit 26 . The control or regulating unit 26 outputs control commands to the plasticizing unit 23 .

[0083] The control or regulating unit 26 can be connected to an operating unit and / or a display device 27 or can be an integrated component of such an operating unit.

[0084] Figures 2 to 5 A first embodiment of a clamping unit 1 for a molding machine 2 according to the invention is shown, wherein Figure 2 and Figure 3 shows a perspective view of the clamping unit 1 in the closed state, and Figure 4 and Figure 5 A perspective view shows the clamping unit in the open state.

[0085] In the closed state of the clamping unit 1 (e.g. Figure 2 and Figure 3 ), the movable mold clamping plate 4 is brought so close to the fixed mold clamping plate 3 that the forming mold 17 (not shown in these figures for reasons of clarity) arranged between the mold clamping plates 3, 4 is closed and / or the forming mold halves lie against each other.

[0086] In the closed state of the movable mold clamping plate 4 relative to the fixed mold clamping plate 3 , the mold clamping plates 3 , 4 are connected to each other via crossbars 5 , 6 in that the crossbars 5 , 6 are locked to the mold clamping plates 3 , 4 via locking devices 9 , 10 .

[0087] Subsequently, a tensile force is generated on the crossbars 5 , 6 by the clamping force means 7 , 8 , more precisely by the pressure pads 11 of the clamping force means 7 , 8 , which leads to a pressure on the forming tool 17 arranged between the tool clamping plates 3 , 4 .

[0088] Here, the fixed mold clamping plate 3 is fixedly connected to the machine frame 15 , while the movable mold clamping plate 4 is arranged on the machine frame 15 via guides 16 so as to be linearly displaceable relative to the fixed mold clamping plate 3 .

[0089] In this exemplary embodiment, the clamping unit has two first transverse beams 5 which extend through the movable mold clamping plate 4 and the fixed mold clamping plate 3 .

[0090] The two first transverse beams 5 are connected to the stationary mold clamping plate 3 via a clamping force mechanism 7 and are held substantially immovably thereon by the clamping force mechanism 7 during the opening and closing movement of the movable mold clamping plate 4 .

[0091] The two first transverse beams 5 can be locked relative to the movable mold platen 4 by means of locking devices 9 and can thus be connected to the movable mold platen 4 by closing the locking devices 9 .

[0092] The locking device 9 has a split locking nut 12 for each of the two first transverse beams 5. The split locking nut 12 has two locking nut parts, which can preferably be driven translationally relative to the first transverse beam 5 for the opening and / or closing movement.

[0093] In order to synchronize the opening and / or closing movement of the locking nut 12 of the first locking device 9 , a synchronization device 14 is provided which synchronizes the movement of the locking nut parts via a synchronization link 13 .

[0094] A corresponding design of the locking device 9 with the synchronization device 14 makes it possible to synchronize the movement of a plurality of locking nuts 12 .

[0095] also, Figures 2 to 5 The clamping unit 1 of the exemplary embodiment of FIG. 5 has two second transverse beams 6 , which likewise extend through the movable mold clamping plate 4 and the fixed mold clamping plate 3 .

[0096] However, the two second transverse beams 6 are connected to the movable mold clamping plate 4 by means of two second clamping force devices 8 and are held by the movable mold clamping plate 4 during the opening movement of the movable mold clamping plate 4 and thus move therewith.

[0097] This leads to the main advantage (as in Figure 4 and Figure 5 ), i.e. in the open position of the clamping unit 1, the fixed mold clamping plates can be moved laterally (in Figure 4 and Figure 5 From the rear side in the view of FIG, wherein, for example, a larger component serving as an insert for the forming mold 17 can be moved through the opening between the movable mold clamping plate 4 and the fixed mold clamping plate 3.

[0098] The two second cross members 6 can be locked with the fixed mold clamping plate by means of a second locking device 10 .

[0099] The two second locking devices 10 of the two second transverse beams 6 are constructed essentially similarly to the two first locking devices 9 of the two first transverse beams 5 on the movable mold clamping plate 4 and each have a locking nut 12 for each of the two second transverse beams 6, which are preferably synchronized with each other in their movement via a synchronization device 14.

[0100] In this exemplary embodiment, the first clamping force device 7 and the second clamping force device 8 are designed as pressure pads 11 which are hydraulically actuated in order to build up the clamping force.

[0101] In other words, it can also be said that the two second transverse beams 6 with the associated locking devices 10 and second clamping force means 8 are a rotational embodiment of the two first transverse beams 5 with their first locking devices 9 and first clamping force means 7 .

[0102] pass Figures 6 to 9 A second embodiment of the clamping unit according to the invention is shown, in which: Figure 6 and Figure 7 The clamping unit 1 is shown again in the closed state, and Figure 8 and Figure 9 The clamping unit 1 is shown in the open position.

[0103] Figures 6 to 9 The clamping unit 1 of the embodiment is basically the same as Figures 2 to 5The same clamping unit as in the embodiment, however, Figures 6 to 9 In the second exemplary embodiment of the clamping unit 1 according to the invention, further components of the clamping unit are additionally arranged.

[0104] For example, a handling device 19 is provided, which is designed to supply an insert to the forming tool 17 , more precisely to a forming tool half arranged on the fixed tool plate 3 , and to insert it into the forming tool 17 .

[0105] The insert supplied to the forming die 17 via the operating device 19 is first preheated by a heating device 18 (e.g., a heating furnace), whereby the preheated or heated insert can be taken out directly from the heating furnace 18 and can be supplied to the forming die 17 in the fastest possible way and without significant heat and energy losses via a direct path achieved by the operating device 19.

[0106] This can be achieved by opening the Figure 8 and Figure 9 ) The two second transverse beams 6 enable lateral access to the forming mold 17 via the operating device 19.

[0107] Figures 10 to 13 A third embodiment of a clamping unit 1 according to the invention is shown, wherein Figures 6 to 9 Compared with the embodiment, Figures 10 to 13 The third exemplary embodiment of the clamping unit 1 additionally comprises a crossbeam pulling device 20 for the crossbeam 6 .

[0108] Therefore, in Figure 10 and Figure 11 1 shows the open position of the clamping unit 1 , in which the movable mold clamping plate 4 is moved relative to the fixed mold clamping plate 3 into the open position in which the mold halves of the forming mold 17 are released.

[0109] Now, as in Figure 10 and Figure 11 As can be seen, for example, due to the installation space, it may be the case that in such a position of the movable mold platen 4 the two second transverse beams 6 do not yet allow lateral access for the operating device 19 because the fixed mold platen 3 is not yet sufficiently released.

[0110] By additionally using the crossbar pulling device 20, the two second crossbars 6 can be lifted from the movable mold clamping plate 4 by means of the associated two second clamping force devices 8 (more precisely by means of the pressure pads 11), whereby the second crossbars are pulled out of the movable mold clamping plate 4 and thus additionally kept at a distance from the fixed mold clamping plate 3, e.g., by Figure 12 and Figure 13 As can be seen.

[0111] It can be provided that the opening and / or closing movement of the movable mold platen 4 relative to the fixed mold platen 3 is carried out parallel to, synchronously with, or simultaneously with the movement of the crossbar pulling device 20 .

[0112] The crossbar pulling device 20 can have, for example, a hydraulic piston-cylinder unit which is designed to move the two second clamping force means 8 relative to the movable mold platen 4 .

[0113] Figure 14 and Figure 15 The fourth embodiment of the clamping unit 1 according to the invention shows a clamping unit 1 in which the two second crossbeams 6 can in turn be moved with their two second clamping elements 8 relative to the movable mold clamping plate 4 via a crossbeam pulling device 20 , as already explained in the preceding figures.

[0114] However, for more intuitiveness, Figure 14 and Figure 15 The embodiment of FIG. 1 shows a clamping unit 1 without a manipulation device 19 , a heating device 18 or a forming mold 17 .

[0115] However, Figure 14 and Figure 15 The remaining features of the embodiment of Figures 10 to 13 Those features of the embodiments.

[0116] Figure 16 and Figure 17 A fifth embodiment of a clamping unit 1 according to the invention is shown, but in contrast to the preceding embodiments, the two second crossbeams 6 now represent upper crossbeams 6 of the clamping unit 1 and the two first crossbeams 5 represent crossbeams of the clamping unit 1 near the ground.

[0117] Here again it can be seen how, in the open position of the clamping unit 1, the forming mold part 17 arranged on the fixed mold clamping plate 3 is released upward by the movement of the two second crossbeams 6 together with the movable mold clamping plate 4, which enables a simple and uncomplicated engagement of the operating device 19 and also facilitates the transport of the insert from the heating device 18 to the forming mold 17, without having to bypass the crossbeams 6, 7 by correspondingly actuating the operating device 19.

[0118] The remaining features correspond essentially—matchingly—to the features of the preceding exemplary embodiment, wherein only the positioning of the two second transverse beams 6 and the two first transverse beams 5 is changed.

[0119] Figure 18 and Figure 19 A sixth exemplary embodiment of the clamping unit according to the invention is shown in the open state.

[0120] exist Figure 18 and Figure 19 In this embodiment, Figure 16 and 17 Compared to the embodiment of the present invention, the positioning of the heating device 18 and the operating device 19 relative to the mold clamping plates 3, 4 and the forming mold 17 is changed, wherein Figure 18 and Figure 19 In the embodiment of FIG. 1 , the heating device 18 and the operating device 19 are arranged above the fixed mold clamping plate 3 .

[0121] It can thus be seen that the clamping area of the fixed mold clamping plate 3 is released upward in the open position of the clamping unit 1 by the two second crossbeams 6 and that the forming mold 17 arranged on the fixed mold clamping plate 3 can therefore also be operated well, simply and uncomplicatedly by the operating device 19, whereby larger inserts can also be supplied directly to the forming mold 17 from the heating device 18.

[0122] The remaining features correspond essentially to those of the preceding embodiment.

[0123] Reference Signs List

[0124] 1 Clamping unit

[0125] 2 Molding Machine

[0126] 3 Fixed mold clamping plate

[0127] 4 Movable mold clamping plates

[0128] 5 First crossbar

[0129] 6 Second crossbar

[0130] 7. First clamping force mechanism

[0131] 8 Second clamping force mechanism

[0132] 9 First locking device

[0133] 10 Second locking device

[0134] 11 Pressure Pads

[0135] 12 Lock nut

[0136] 13 Synchronizing rod

[0137] 14 Synchronizer

[0138] 15 racks

[0139] 16 Guide device

[0140] 17 Forming die

[0141] 18 Heating device

[0142] 19 Operating device

[0143] 20 Beam pulling device

[0144] 21 Injection unit

[0145] 22 Piston-cylinder unit

[0146] 23 Plasticizing Unit

[0147] 24 material cylinders

[0148] 25 drive unit

[0149] 26 Control or regulating devices

[0150] 27 Operating unit and / or display device

Claims

1. A clamping unit for a molding machine (2), comprising: - a mold clamping plate (4) movable relative to the fixed mold clamping plate (3); - at least one first crossbeam (5) extending through the movable mold clamping plate (4) and the fixed mold clamping plate (3); - a first clamping force mechanism (7) connecting the at least one first crossbeam (5) to the fixed mold clamping plate (3); and a first locking device (9), wherein the at least one first transverse member (5) can be locked relative to the movable mold clamping plate (4) by means of the first locking device (9), It is characterized in that at least one second crossbeam (6) is provided which passes through the movable mold clamping plate (4) and the fixed mold clamping plate (3), and the at least one second crossbeam (6) is connected to the movable mold clamping plate (4) and can be locked relative to the fixed mold clamping plate (3) by means of at least one second locking device (10).

2. The mold clamping unit according to claim 1, wherein: The at least one second crossbeam (6) is connected to the movable mold clamping plate (4) by means of a second clamping force mechanism (8).

3. The mold clamping unit according to claim 1, wherein: The first clamping force device (7) has at least one pressure pad (11), which is connected to the at least one first crossbeam (5) and rests on the fixed mold clamping plate (3) for building up the clamping force.

4. The mold clamping unit according to claim 2, wherein: The second clamping force device (8) has at least one pressure pad (11), which is connected to the at least one second crossbeam (6) and rests on the movable mold clamping plate (4) for building up the clamping force.

5. The mold clamping unit according to claim 3 or 4, wherein: The pressure pad (11) is a hydraulically actuated pressure pad (11).

6. The clamping unit according to any one of claims 1 to 4, wherein: The first locking device (9) and / or the second locking device (10) has a locking nut (12).

7. The clamping unit according to any one of claims 1 to 4, wherein: The first locking device (9) and / or the second locking device (10) has a split locking nut (12).

8. The clamping unit according to any one of claims 1 to 4, wherein: At least two first cross beams (5) and / or at least two second cross beams (6) are provided.

9. The mold clamping unit according to claim 8, wherein: The at least two first locking devices (9) of the at least two first transverse beams (5) and / or the at least two second locking devices (10) of the at least two second transverse beams (6) comprise a common actuator for operating the locking devices.

10. The mold clamping unit according to claim 8, wherein: The first locking device (9) and / or the second locking device (10) has a locking nut (12), and a synchronization device (14) is provided for connecting the two locking nuts (12). The synchronization device is constructed to synchronize the movement of the locking nuts (12) of the at least two first locking devices (9) of the at least two first crossbeams (5) and / or synchronize the movement of the locking nuts (12) of the at least two second locking devices (10) of the at least two second crossbeams (6).

11. The mold clamping unit according to claim 10, wherein: The synchronization device (14) has a synchronization rod (13).

12. The clamping unit according to any one of claims 1 to 4, wherein: The at least one first crossbeam (5) is anchored to the fixed mold clamping plate (3) in a removable manner by means of a releasable holding device and / or the at least one second crossbeam (6) is anchored to the movable mold clamping plate (4) in a releasable manner by means of a releasable holding device.

13. The mold clamping unit according to claim 12, wherein: The at least one first crossbeam (5) is supported so as to be extendable toward a side facing away from the movable mold clamping plate (4) by means of a crossbeam pulling device (20) on the fixed mold clamping plate (3) and / or the at least one second crossbeam (6) is supported so as to be extendable toward a side facing away from the fixed mold clamping plate (3) by means of a crossbeam pulling device (20) on the movable mold clamping plate (4).

14. The mold clamping unit according to claim 13, wherein: The crossbeam pulling device (20) has at least one hydraulic piston-cylinder unit.

15. The clamping unit according to any one of claims 1 to 4, wherein: A total of four first cross beams (5) and four second cross beams (6) are provided.

16. The clamping unit according to any one of claims 1 to 4, wherein: The clamping unit (1) is constructed as a double-plate clamping unit.

17. A molding machine comprising a clamping unit (1) according to any one of claims 1 to 16.

18. The molding machine according to claim 17, wherein: The molding machine is an injection molding machine.

19. The arrangement of a clamping unit (1) according to any one of claims 1 to 16 or a molding machine (2) according to claim 17 or 18, comprising at least one providing device.

20. The arrangement of claim 19, wherein: The providing device is an operating device (19), a heating device (18) and / or a conveying device.

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