Locking device, clamping unit and molding machine

Abstract

This invention relates to a locking device comprising: at least two locking nuts, each disposed on a crossbeam and each having at least first and second nut components, wherein an imaginary plane extends perpendicularly to the longitudinal axis of the locking nuts at least approximately half their height; a synchronizing element; at least two rods, wherein the first nut component of one locking nut and the second nut component of the other locking nut are hingedly connected to the synchronizing element via a rod; at least two synchronizing rods, wherein the second nut component of one locking nut and the first nut component of the other locking nut are interconnected via a synchronizing rod; and a linear drive device eccentrically connected to the synchronizing element via a rotary hinge for rotating the synchronizing element. The force applied to the nut components via the synchronizing element by the linear drive device is loaded in the imaginary plane or symmetrically about the imaginary plane. The invention also relates to a mold clamping unit and a molding machine.

Description

Technical Field

[0001] The present invention relates to a locking device for locking a mold clamping plate onto at least two differently positioned crossbeams of a mold clamping unit of a molding machine; a mold clamping unit for a molding machine including such a locking device; and a molding machine including such a mold clamping unit. Background Technology

[0002] DE102012000741B4 and DE102012025759B3 respectively demonstrate such a locking device, such a mold clamping unit, and such a molding machine, including:

[0003] - Four locking nuts with height, each locking nut being correspondingly provided to one of four differently positioned crossbeams and having a first and a second nut component respectively;

[0004] - A rotatably set synchronization element for every two locking nuts;

[0005] - At least two rods for each synchronizing element, a first nut component of one of the locking nuts and a second nut component of the other locking nut are hingedly connected to one of the synchronizing elements via one of the at least two rods;

[0006] - Four synchronizing rods for every two locking nuts, wherein the second nut component of one locking nut and the first nut component of the other locking nut are interconnected via every two of the four synchronizing rods;

[0007] - A rotary drive device oriented parallel to the height of each locking nut, for each of the two synchronizing elements.

[0008] Another type of locking device is in DE20006618U1. Figures 8 to 10 As shown in the figure. Here, a linear drive device in the form of a hydraulic piston-cylinder unit is provided for the rotation of each synchronization element. Each synchronization rod, each synchronization element, and the linear drive device are arranged in different imaginary planes (these imaginary planes extend perpendicularly to the longitudinal axis of each locking nut in height).

[0009] The existing technology has a problem known as "nut tilting". Here, the ends of each locking nut that are away from the plate tilt in the direction of the corresponding crossbeam, which causes excessive wear. Summary of the Invention

[0010] The object of the present invention is to provide a locking device for locking a mold clamping plate onto at least two differently positioned crossbeams of a mold clamping unit of a molding machine, wherein, compared with the prior art, at least the problem of nut tilting is reduced, and preferably eliminated; to provide a mold clamping unit for a molding machine including such a locking device, and a molding machine including such a mold clamping unit.

[0011] The objective is achieved by a locking device according to the invention, a mold closing unit for a molding machine including such a locking device, and a molding machine including such a mold closing unit.

[0012] This invention provides a locking device for locking a mold clamping plate onto at least two differently positioned crossbeams of the mold closing unit of a molding machine. The locking device includes:

[0013] - At least two locking nuts of height, the locking nuts being correspondingly disposed on one of the crossbeams positioned differently and having at least first and second nut components respectively, wherein, at least approximately at half the height of the locking nuts, an imaginary plane extends perpendicularly to the longitudinal axis of each locking nut extending at said height;

[0014] - A rotatable synchronization element;

[0015] - At least two rods, wherein a first nut component of one of the at least two locking nuts and a second nut component of the other of the at least two locking nuts are hingedly connected to the synchronization element via one of the at least two rods;

[0016] - At least two synchronizing rods, wherein the second nut component of one of the at least two locking nuts and the first nut component of the other of the at least two locking nuts are interconnected via one of the at least two synchronizing rods; - a linear drive device that is eccentrically connected to the synchronizing element via a rotary joint in order to rotate the synchronizing element;

[0017] The linear drive, the synchronization element, and the at least two rods are oriented relative to an imaginary plane such that the force applied by the linear drive via the synchronization element to the nut component connected to the at least two rods is applied in the imaginary plane or symmetrically about the imaginary plane.

[0018] Because it is specified that the linear drive, synchronizing element, and at least two rods are oriented relative to an imaginary plane, the force applied by the linear drive via the synchronizing element to the nut component connected to the at least two rods is either applied in the imaginary plane or symmetrically about the imaginary plane. The closer the imaginary plane is to half the height of the locking nut, the less nut tilting occurs. If the imaginary plane is exactly half the height of the locking nut, then no nut tilting will occur at all.

[0019] By applying a linear drive, a smaller structural size is achieved compared to using a rotary drive with the axis set on the synchronizing element.

[0020] Locking in the locked state can be achieved in a known manner, such that the grooves, recesses, or teeth provided on the nut component are pressed against the complementary section formed by the crossbeam.

[0021] It can be stipulated that when the synchronizing element is rotated in the first rotation direction by the linear drive device, the first nut component of one of the at least two locking nuts and the second nut component of the other of the at least two locking nuts can move toward each other;

[0022] And at the same time,

[0023] - The second nut component of one of the at least two locking nuts and the first nut component of the other of the at least two locking nuts can move in opposite directions;

[0024] And when the synchronizing element is rotated in the second rotational direction by the linear drive device,

[0025] - The second nut component of one of the at least two locking nuts and the first nut component of the other of the at least two locking nuts can move toward each other;

[0026] And at the same time,

[0027] - The first nut component of one of the at least two locking nuts and the second nut component of the other of the at least two locking nuts can move in opposite directions.

[0028] Rotation in one of the two rotational directions causes each nut component to switch to the locked state, while rotation in the other of the two rotational directions causes each nut component to switch to the open state.

[0029] Preferably, it is specified that:

[0030] One of the rods, along with the linear drive unit, is supported on a nut connector.

[0031] And together with the linear drive and the synchronization element, they form an imaginary triangle, at least in the locked state, said imaginary triangle being located in an imaginary plane; or

[0032] - One of the rods is connected to the linear drive via a drive connector and together with the linear drive and the synchronization element, at least in the locked state, forms an imaginary polygon (e.g., a quadrilateral or pentagon) with a number of sides greater than or equal to 4, said imaginary polygon being in an imaginary plane.

[0033] Two measures ensure that the rods do not straighten even when the locking device is in the locked state, and therefore retain a reverse motion for the locking movement under any circumstances. Furthermore, advantageous kinematics are achieved because the movement of the nut components is slowed near the locked state, and therefore, the installation of a buffer device can preferably be omitted, which will not lead to: undesirable noise development or even damage to the nut components due to excessively rapid collisions. The linear drive can be designed with lower power consumption.

[0034] Linear drives can be configured as hydraulic piston-cylinder units, electrical linear drives, or the like.

[0035] If it is ensured that there is no straightening of the rods in the locked state, in the case of a hydraulic piston-cylinder unit, the flow of hydraulic oil in the locked state can be prevented by a shut-off valve, so that the hydraulic pump supplying the hydraulic piston-cylinder unit does not need to continuously generate pressure in the locked state.

[0036] Preferably, the at least two synchronizing rods are arranged symmetrically with respect to the height of the locking nut, and are preferably located in the edge region of the nut component.

[0037] In one embodiment of the invention, one of the rods (at least two rods for each synchronizing element, a first nut component of one of the locking nuts and a second nut component of the other locking nut are hingedly connected to one of the synchronizing elements via one of the at least two rods) is constituted by the linear drive device itself.

[0038] Preferably, the locking device according to the invention is used in a double-plate mold closing unit.

[0039] Preferably, in the mold clamping unit according to the invention, a designated energy source or a designated energy accumulator is provided to drive the locking device, such that the movement of one of the mold clamping plates and the driving of the locking device can be performed independently of each other.

[0040] It can be specified here that an accumulator for supplying power to the linear drive unit of the locking device is provided on the clamping plate of the mold where the locking device is located. In the case where the linear drive unit is a hydraulic piston-cylinder unit, the accumulator may be, for example, a hydraulic accumulator; in the case where the linear drive unit is an electric servo drive, the accumulator may be, for example, an energy storage device.

[0041] In the mold clamping unit according to the present invention, it can be specified that the support part of the linear drive device is formed on the mold clamping plate in the form of a separate drive device connector.

[0042] Preferably, in the mold clamping unit according to the invention, a locking device with four locking nuts is provided on a mold clamping plate, wherein a common synchronization element is provided for every two locking nuts.

[0043] It can be stipulated here that,

[0044] - Alternatively, each of the two synchronizing elements can be equipped with its own linear drive.

[0045] - Alternatively, a common linear drive can be provided for the two synchronizing elements, through which the operating lever connecting the two synchronizing elements can be driven.

[0046] Examples of molding machines include injection molding machines, especially injection molding machines, die casting machines, and injection compression molding machines. Attached Figure Description

[0047] Embodiments of the present invention are illustrated with reference to the accompanying drawings. Wherein:

[0048] Figure 1 Showing a top view of the molding machine according to the invention along its longitudinal axis;

[0049] Figure 2 Displayed Figure 1 The side view of the molding machine shown in the image;

[0050] Figure 3 Displayed Figure 1 and Figure 2 A separate perspective view of the mold clamping plate visible in the image;

[0051] Figure 4 An embodiment of the locking device according to the present invention in the locked position is shown;

[0052] Figure 5 Displayed Figure 4 The embodiment described in the figure is in the unlocked position;

[0053] Figure 6 show Figure 4Side view;

[0054] Figures 7-9 Another embodiment of the locking device is shown. Figures 4-6 Similar views;

[0055] Figure 10 Showing a top view of a portion of the molding machine according to the present invention.

[0056] Figures 11-13 and Figure 10 Other embodiments are shown similarly;

[0057] Figure 14 Showing a top view of a portion of the molding machine according to the invention according to another embodiment;

[0058] Figure 15 Showing a top view of a portion of the molding machine according to the invention according to another embodiment;

[0059] Figure 16 show Figure 15 Side view;

[0060] Figure 17 Showing a top view of a portion of the molding machine according to the invention according to another embodiment. Detailed Implementation

[0061] Figures 1-3 The mold clamping unit of the molding machine (in this form, an injection molding machine, wherein the injection unit is not described because it corresponds to the prior art) according to the invention is shown. This mold clamping unit is configured as a double-plate mold clamping unit, including a mold clamping plate 8 fixedly connected to the machine bed 7. Figure 2 The middle is located on the right side) and the mold clamping plate (in) is movably supported relative to the machine bed 7. Figure 2 (The middle is located on the left). For a rapid stroke process, a quick-closing cylinder 11 is set. The closing force is established through the pressure pad 10.

[0062] In order to supply the linear drive device 4, which is configured as a hydraulic piston-cylinder unit, a hydraulic accumulator 9 is provided on the mold clamping plate 8, which can be filled by the hydraulic system of the mold closing unit (not described).

[0063] Two locking devices are provided to lock the mold clamping plate 8 on four differently positioned crossbeams 6 of the molding machine. Each locking device has:

[0064] - Two locking nuts with height H are respectively fitted to one of the crossbeams 6 which are positioned differently and have first and second nut parts 5 and 5' respectively. At half the height H / 2 of the locking nuts, the imaginary plane E is aligned with the longitudinal axis of the locking nuts extending at height H.

[0065] Extending vertically;

[0066] - Synchronization element 2 is rotatably mounted on mold clamping plate 8 via bolt 17;

[0067] - Two rods 1 and 3, the first nut component 5 of one of the locking nuts and the second nut component 5' of the other locking nut are connected via the two rods 1 and 3.

[0068] One of the rods is hinged to ground with the synchronization element 2;

[0069] - Four synchronizing rods 12, the second nut component 5' of one locking nut and the first nut component 5 of another locking nut are interconnected via two synchronizing rods 12;

[0070] - Linear drive 4, which is eccentrically connected to the synchronization element 2 via a rotary joint in order to rotate the synchronization element 2.

[0071] For example, especially from Figure 4 and Figure 5 The descriptions (which are mirror images of each other, and described in an open manner in one diagram and in a closed manner in another) show that when the synchronizing element 2 is rotated in the first rotational direction by the linear drive device,

[0072] - The first nut component 5 of one of the at least two locking nuts and the second nut component 5' of the other of the at least two locking nuts.

[0073] They can move towards each other;

[0074] And at the same time,

[0075] - The second nut component 5' of one of the at least two locking nuts and the first nut component 5 of the other of the at least two locking nuts can move in opposite directions;

[0076] And when the synchronizing element 2 is rotated in the second rotation direction by the linear drive device, the second nut component 5' of one of the at least two locking nuts and the first nut component 5 of the other of the at least two locking nuts can move toward each other;

[0077] And at the same time,

[0078] - The first nut component 5 of one of the at least two locking nuts and the second nut component 5' of the other of the at least two locking nuts.

[0079] They can move in opposite directions.

[0080] The movement of the nut components 5 and 5', which are positioned closer together than the different locking nuts, is achieved via rods 1 and 3. The movement of the nut components 5 and 5', which are positioned further apart than the different locking nuts, is achieved via synchronizing rods 12. Two synchronizing rods 12 connect the nut components 5 of the different locking nuts that always move in the same direction, and two synchronizing rods 12 also connect the nut components 5' of the different locking nuts that always move in the same direction (in...). Figure 4 and Figure 5 Only one synchronizing rod 12 is visible in each case, but see [link / reference] Figure 6 ).

[0081] exist Figure 4 The document describes the tightening state of the lock nut. Figure 5 The description refers to the open state of the lock nut.

[0082] To guide the nut components 5 and 5' in translation, guide members 16 are provided.

[0083] The drive rod 15 of the linear drive unit 4 (which is configured herein as a hydraulic piston-cylinder unit) is connected to a hinge that connects the synchronizing element 2 to one of the rods 3. In this embodiment, the piston housing the drive rod 15 is supported on a drive unit connector 19 formed on another rod 1, allowing the linear drive unit 4 to move together with the rods 1 and 3. The linear drive unit 4, the synchronizing element 2, and the rods 1, together with the drive unit connector 19, are arranged in the form of an imaginary quadrilateral in an imaginary plane E.

[0084] exist Figures 7-9 The embodiment described in the previous section differs in that, here, the piston is not hingedly supported on another rod 1, but rather directly hingedly supported on one of the nut connectors 14. The linear drive 4, the synchronizing element 2, and the rod 1 are arranged in the form of an imaginary triangle, which lies in an imaginary plane E.

[0085] exist Figure 10 In the embodiments, with Figures 4-6 The difference in the embodiment is that the drive rod 15 of the linear drive device 4 is not hinged to the rod 3, but is hinged to the cam component of the synchronization element 2.

[0086] Such measures are also Figure 11 In the embodiment, however, additionally, rod 1 is configured to be shorter and, with Figure 10The missing length is compensated by the lever component of the synchronizing element 2. Here, the linear drive 4, the synchronizing element 2, and the rod 1, together with the drive connector 19, form an imaginary pentagon that lies in an imaginary plane E.

[0087] The linear drive 4, the synchronization element 2, and the two rods 1 and 3 are oriented relative to an imaginary plane E (which is set at half the height H / 2), such that the force applied by the linear drive 4 via the synchronization element 2 to the nut components 5 and 5' connected to the rods 1 and 3 is symmetrically achieved about the imaginary plane E (see [link to documentation]). Figure 6 (as described in the figure), using the nut connector 14 with corresponding nut parts 5, 5' symmetrically arranged with tabs about an imaginary plane E (the hinge pin of the nut connector 14 is located on rods 1, 3). Unlike the figure shown, the tabs of the nut connector 14 can be provided on rods 1, 3, and the hinge pin can be provided on the corresponding nut parts 5, 5'.

[0088] exist Figures 10-13 The difference in the embodiment lies in the construction of the synchronization element 2, which creates another connection point for the linear drive 4 and thus a different stroke for the linear drive 4. Therefore, the velocity profile of the entire kinematic system, as well as the starting and ending positions (open and closed states) of the different levers, change.

[0089] exist Figure 14 In the embodiment, only one common linear drive device 4 is provided for the two locking devices, and the driving of each synchronization element 2 is achieved through a control lever 18.

[0090] exist Figure 15 and Figure 16 In one embodiment, the linear drive 4 is connected to the synchronization element 2 at one end and supported separately on the mold clamping plate 8 via the drive connector 19 at the other end.

[0091] exist Figure 17 In one embodiment, one of the rods 1 and 3 is constituted by the linear drive device 4 itself.

[0092] All embodiments show a particularly preferred arrangement of the synchronizing rods 12, wherein each synchronizing rod 12 is arranged symmetrically with respect to the height H of the locking nut, and is preferably located in the edge region of the nut parts 5, 5'.

[0093] By using different configurations of the geometry of rods 1 and 3, synchronization element 2, and linear drive device 4 as described in the attached figures, different desired kinematic processes for the movement of nut components 5 and 5' can be achieved.

[0094] List of reference numerals

[0095] 1 stroke

[0096] 2 Synchronization Components

[0097] 3 strokes

[0098] 4 Linear Drive Unit

[0099] 5 First Nut Component

[0100] 5' Second nut component

[0101] 6 crossbeams

[0102] 7 Machine bed

[0103] 8 Mold clamping plates

[0104] 9. Hydraulic accumulator

[0105] 10 pressure pads

[0106] 11 Quick cylinder shut-off

[0107] 12 Synchronous Rods

[0108] 13 living festivals

[0109] 14 Nut Connector

[0110] 15 drive levers

[0111] 16 guides

[0112] 17 bolts

[0113] 18. Manipulating the lever

[0114] 19 Drive unit connector

[0115] Height of H lock nut

[0116] E passes through the imaginary plane of the lock nut.

Claims

1. A locking device for locking a mold clamping plate (8) onto at least two differently positioned crossbeams (6) of a molding machine's mold clamping unit, said locking device comprising: - At least two locking nuts having a height (H), the locking nuts being correspondingly disposed on one of the crossbeams (6) positioned differently and having at least first and second nut parts (5, 5'), wherein, at least approximately at half the height (H) of the locking nuts, an imaginary plane (E) extends perpendicularly to the longitudinal axis of each locking nut extending at the height (H). - A rotatable synchronization element (2); - At least two rods (1, 3), the first nut part (5) of one of the at least two locking nuts and the second nut part (5') of the other of the at least two locking nuts are hingedly connected to the synchronization element (2) via one of the at least two rods (1, 3); - At least two synchronizing rods (12), the second nut part (5') of one of the at least two locking nuts and the first nut part (5) of the other of the at least two locking nuts are interconnected via one of the at least two synchronizing rods (12); - Linear drive device (4), which is eccentrically connected to the synchronizing element (2) via a rotary joint in order to rotate the synchronizing element (2); The linear drive (4), the synchronization element (2), and the at least two rods (1, 3) are oriented relative to the imaginary plane (E) such that the force exerted by the linear drive (4) on the nut components (5, 5') connected to the at least two rods (1, 3) via the synchronization element (2) is applied in the imaginary plane (E) or symmetrically about the imaginary plane.

2. The locking device according to claim 1, wherein, One of the rods (1, 3) is supported together with the linear drive (4) on a nut connector (14), and together with the linear drive (4) and the synchronization element (2) forms an imaginary triangle at least in the locked state, the imaginary triangle being in an imaginary plane (E).

3. The locking device according to claim 1, wherein, One of the rods (1, 3) is connected to the linear drive (4) via a drive connector (19) formed on the synchronization element (2), and together with the linear drive and the synchronization element (2), forms an imaginary polygon with a number of sides greater than or equal to 4, at least in the locked state, the imaginary polygon being in an imaginary plane (E).

4. The locking device according to any one of claims 1 to 3, wherein, The at least two synchronizing rods (12) are arranged symmetrically with respect to the height of the locking nut.

5. The locking device according to claim 4, wherein, The at least two synchronizing rods (12) are located in the edge region of each nut component (5, 5').

6. The locking device according to any one of claims 1 to 3, wherein, One of the rods (1, 3) is formed by the linear drive device (4) itself.

7. A mold closing unit comprising a locking device according to any one of claims 1 to 6.

8. The mold closing unit according to claim 7, wherein, It has its own energy source or an energy storage device to drive the locking device, so that the movement of one of the mold clamping plates (8) and the driving of the locking device can be carried out independently of each other.

9. The mold clamping unit according to claim 8, wherein, An accumulator for supplying energy to the linear drive device (4) of the locking device is provided on the mold clamping plate (8) where the locking device is provided.

10. The mold clamping unit according to any one of claims 7 to 9, wherein, The support portion of the linear drive device (4) is formed on the mold clamping plate (8) in the form of a separate drive device connector (19).

11. The mold clamping unit according to any one of claims 7 to 9, wherein, A locking device with four locking nuts is provided on a mold clamping plate (8), wherein a common synchronization element (2) is provided for every two locking nuts.

12. The mold clamping unit according to claim 11, wherein, - Alternatively, each of the two synchronizing elements (2) can be provided with its own linear drive (4). - Alternatively, a common linear drive (4) can be provided for the two synchronization elements (2), through which the operating lever (18) connecting the two synchronization elements (2) can be driven.

13. The mold clamping unit according to any one of claims 7 to 9, wherein, The mold-closing unit is a double-plate mold-closing unit.

14. A molding machine comprising a mold clamping unit according to any one of claims 7 to 13.

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