Drive unit and molding machine

Abstract

This invention relates to a drive unit for driving at least one component of a molding machine, comprising: a first carrier (1); a lead screw (2) rotatably supported at one end in or on the first carrier and extending from one side of the first carrier; a drive device (3) for rotating the lead screw; a second carrier; a nut non-rotatably disposed in or on the second carrier and movable along the lead screw with the second carrier by rotation of the lead screw; at least one rod disposed on the second carrier, the rod being connectable to or constituting part of the at least one component of the molding machine to be driven; an oil-sealed seal disposed on the side of the first carrier from which the lead screw extends, thereby forming an oil-sealed space with the first carrier, and the lead screw, the second carrier, and the nut being disposed within the oil-sealed space at each movement position of the second carrier and the nut along the lead screw. The invention also relates to a molding machine.

Description

Technical Field

[0001] The present invention relates to a drive unit for a molding machine and a molding machine having such a drive unit. Background Technology

[0002] Ball screw mechanisms have long been used to drive components in molding machines. Broadly speaking, two different implementations of ball screw mechanisms can be distinguished:

[0003] —A ball screw mechanism having a nut that is not rotatably mounted and a lead screw that is rotatably mounted, so that the nut moves along the lead screw when the lead screw rotates; and

[0004] —A ball screw mechanism having a lead screw that is not rotatably mounted and a nut that is rotatably mounted, so that the lead screw moves through the nut when the nut rotates. Summary of the Invention

[0005] This invention relates to a ball screw mechanism according to a first embodiment.

[0006] The purpose of this invention is to provide a drive unit and a molding machine, wherein the drive unit has higher power and higher load capacity.

[0007] This objective is achieved by a drive unit having the features described below and a molding machine having such a drive unit.

[0008] The driving unit according to the present invention includes at least:

[0009] —The first carrier,

[0010] —A lead screw with one end rotatably supported in or on a first carrier and extending from the first carrier.

[0011] —A drive mechanism for rotating the lead screw.

[0012] —Second carrier,

[0013] —A nut that is non-rotatably disposed in or on a second carrier and can rotate along the lead screw with the second carrier (the nut together with the lead screw forms a ball screw mechanism).

[0014] —At least one rod disposed in or on the second carrier, the rod being connectable to or forming part of the at least one component of the molding machine to be driven.

[0015] — An oil-sealed seal is disposed on the side of the first carrier from which the screw extends, thereby forming an oil-sealed space together with the first carrier, and the screw, the second carrier, and the nut are disposed within the oil-sealed space in each movement position of the second carrier and the nut along the screw.

[0016] Because the ball screw is rotatably mounted, a key advantage of the drive unit according to the invention is its low inertia. This results in higher power output with the same drive power. The oil-sealed seals allow for adequate lubrication of the ball screw mechanism without the risk of environmental contamination.

[0017] The seals are preferably constructed in an unchangeable geometry, such as in the form of a can-shaped casting or a single-sided open cylinder, and are therefore designed in terms of their dimensions to meet the maximum space requirements of the lead screw, nut, and second carrier. Therefore, they do not need to be constructed as thrust sleeves.

[0018] The closed and independent configuration of the drive unit makes it possible to add equipment within the molding machine.

[0019] The drive mechanism for the lead screw can be implemented by a transmission device, such as a gear transmission device with a motor, which can be supported on a first carrier, for example.

[0020] It can be specified that the drive unit is located outside the oil-sealed space, preferably on the side of the first carrier opposite to the side from which the lead screw extends (dry structure). This can advantageously be a toothed belt drive or a direct drive unit in the lead screw extension line.

[0021] Alternatively, the drive unit may be specified to be located in an oil-sealed space and preferably at least partially disposed in an oil trough within the oil-sealed space (wet configuration).

[0022] Preferably, the first carrier is constructed in the form of a plate and is preferably passed through by the at least one rod.

[0023] It can be specified that the at least one rod has a circular cross-section, passes through the first carrier, and is sealed by an oil-sealed rod seal.

[0024] It can be specified that the lead screw is sealed toward the first carrier via an oil-sealed radial shaft sealing ring or an oil-sealed cover.

[0025] Preferably, the second carrier is constructed in the form of a yoke.

[0026] Preferably, an oil groove is provided within the oil-sealed space, and the lead screw is at least partially located within this oil groove. This allows for adequate lubrication of the ball screw mechanism, as well as cooling through the oil groove. Similarly, the gearbox and / or the support structure for the lead screw can also be cooled and lubricated as a result.

[0027] It can be specified that, for the second carrier, in addition to the at least one rod, a linear guide is also provided within the oil-sealed space. This provides improved support for the driving torque of the nut.

[0028] It can be specified that the transmission device driving the drive unit is configured with parallel or arbitrary shafts.

[0029] Preferably, in the molding machine according to the invention, the first carrier is formed by the ejector carrier, end plate or mold clamping plate of the molding machine.

[0030] Preferably, in the molding machine according to the invention, the at least one rod is connected to the crosshead of the toggle closing mechanism of the molding machine.

[0031] Preferably, in the molding machine according to the invention, the at least one rod is connected, in particular, to the closing cylinder of the mold closing unit of the molding machine via an ejector carrier.

[0032] Preferably, in the molding machine according to the invention, the at least one rod is connected to the plasticizing drive device of the plasticizing unit of the molding machine.

[0033] The molding machine according to the present invention is preferably an injection molding machine, and more preferably a plastic injection molding machine or an injection pressure machine. Attached Figure Description

[0034] Advantageous embodiments of the invention are discussed with reference to the accompanying drawings. In the drawings:

[0035] Figure 1 An independent view of the drive unit according to the present invention is shown.

[0036] Figure 2 Showing according to Figure 1 Application of drive units in molding machines

[0037] Figure 3 Showing according to Figure 1 Application of drive units in molding machines

[0038] Figure 4 Showing according to Figure 1 Application of drive units in molding machines. Detailed Implementation

[0039] Figure 1 An embodiment of a drive unit according to the present invention is illustrated schematically, comprising:

[0040] ——First carrier 1,

[0041] —A lead screw 2, one end of which is rotatably supported in or on the first carrier 1 and extends from the first carrier 1.

[0042] —Drive device 3 for rotating lead screw 2,

[0043] —Second carrier 4,

[0044] —A nut 5 that is non-rotatably mounted in or on the second carrier 4 and can rotate via the lead screw 2 to move along the lead screw 2 with the second carrier 4.

[0045] —At least one rod 6 disposed in or on the second carrier 4, the rod being connectable to or forming part of the at least one component of the molding machine to be driven.

[0046] — An oil-sealed sealing element 7 is disposed on the side of the first carrier 1 from which the lead screw 2 extends, thereby forming an oil-sealed space together with the first carrier 1, and the lead screw 2, the second carrier 4 and the nut 5 are disposed within the oil-sealed space at each movement position of the second carrier 4 and the nut 5 along the lead screw 2.

[0047] In the illustrated embodiment, the first carrier 1 is constructed in the form of a plate. The lead screw 2 is immovably supported in the first carrier 1 via an oil-sealed rotary bearing. The drive device 3 for rotating the lead screw 2 can be... Figure 1 The motor (not shown) is driven by a transmission device. The two rods 6 are sealed relative to the first carrier 1 via rod seals 8. The support structure of the lead screw 2 is sealed relative to the first carrier 1 via a radial shaft seal ring.

[0048] The second carrier 4 is constructed in the form of a yoke, through which a lead screw 2 passes and a nut 5 is fixedly mounted on the yoke in a non-rotatable manner. Two rods 6 are supported on the second carrier, which pass through the first carrier and can be connected to a component of the molding machine to drive that component, or can be configured as part of such a component.

[0049] exist Figure 2 The figure shows a molding machine according to the invention in the form of a three-platen injection molding machine, wherein two rods 6 are operatively connected to the crosshead 10 of the toggle lever closing mechanism.

[0050] exist Figure 3 In this invention, the drive unit is used to drive the plasticizing drive device 11 of the injection unit of the molding machine configured as an injection molding machine.

[0051] exist Figure 4 The image shows a beamless injection molding machine, in which a rod 6 is connected to an ejector carrier 12 and drives the mold to close.

[0052] The driving unit according to the present invention Figures 2 to 4The application possibilities shown are exemplary and can be understood in particular separately from the specific types of molding machines shown.

[0053] Figure label:

[0054] 1. First Carrier

[0055] 2 lead screws

[0056] 3 drive units

[0057] 4. Second carrier

[0058] 5 nuts

[0059] 6 strokes

[0060] 7 seals

[0061] 8-bar seal

[0062] 9 Radial shaft seals

[0063] 10 crossheads

[0064] 11 Plasticizing Drive Unit

[0065] 12 Ejector Carrier

Claims

1. A drive unit for driving at least one component of a molding machine, comprising: ——First carrier (1), —A lead screw (2) that is rotatably supported in or on a first carrier (1) at one end and extends from one side of the first carrier (1). —Drive device (3) for rotating lead screw (2) —Second carrier (4), —A nut (5) that is not rotatably disposed in or on the second carrier (4) and can rotate along the screw (2) with the second carrier (4). —At least one rod (6) disposed on the second carrier (4), the rod being connectable to or forming part of the at least one component of the molding machine to be driven. — An oil seal (7) is provided on the side of the first carrier (1) from which the screw (2) extends, thereby forming an oil-sealed space together with the first carrier (1) and the screw (2), the second carrier (4) and the nut (5) are provided within the oil-sealed space at each movement position of the second carrier (4) and the nut (5) along the screw (2).

2. The driving unit according to claim 1, wherein, The first carrier (1) is formed in the form of a plate.

3. The driving unit according to claim 2, wherein, The first carrier (1) is passed through by the at least one rod (6).

4. The drive unit according to any one of claims 1 to 3, wherein, The second carrier (4) is constructed in the form of a yoke.

5. The drive unit according to any one of claims 1 to 3, wherein, An oil groove is provided in the space of the oil seal, and the lead screw (2) is located at least partially in the oil groove.

6. The driving unit according to any one of claims 1 to 3, characterized in that, The at least one rod (6) has a circular cross-section, passes through the first carrier (1) and is sealed by an oil-sealed rod seal (8).

7. The drive unit according to any one of claims 1 to 3, wherein, The lead screw (2) is sealed toward the first carrier (1) by an oil-sealed radial shaft sealing ring (9) or by an oil-sealed cap.

8. The drive unit according to any one of claims 1 to 3, wherein, The drive unit (3) is located in the space of the oil seal.

9. The driving unit according to claim 8, wherein, The drive unit (3) is at least partially disposed in the oil trough of the oil seal space.

10. The drive unit according to any one of claims 1 to 3, wherein, The drive unit (3) is located outside the space of the oil seal.

11. The drive unit according to claim 10, wherein, The drive device (3) is located on the side of the first carrier (1) opposite to the side from which the lead screw (2) extends.

12. The drive unit according to any one of claims 1 to 3, wherein, In addition to the at least one rod (6), a linear guide is provided for the second carrier (4) within the space of the oil seal.

13. A molding machine having a drive unit according to any one of claims 1 to 12.

14. The molding machine according to claim 13, wherein, The first carrier (1) is formed by the ejector carrier (12) of the molding machine, the end plate or the mold clamping plate.

15. The molding machine according to claim 13 or 14, wherein, The at least one rod (6) is connected to the crosshead (10) of the elbow closing mechanism of the molding machine.

16. The molding machine according to claim 13 or 14, wherein, The at least one rod (6) is connected to the high-speed cylinder of the molding machine.

17. The molding machine according to claim 13 or 14, wherein, The at least one rod (6) is connected to the plasticizing drive device (11) of the plasticizing unit of the molding machine.

18. The molding machine according to claim 13 or 14, wherein, The molding machine is an injection molding machine or an injection pressure machine.

Images