• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Drive device (1), in particular a closing drive, for an injection molding machine (2), comprising an electric drive motor (3), a lifting element (4) movable by the drive motor (3) along a stroke (H), an electric stroke limiting device (5) the movement of the lifting element (4) upon reaching a certain stroke position (E) is haltable, and a mechanical stroke limiting device (6), by the movement of the lifting element (4) in case of malfunction of the electric stroke limiting device (5) via a mechanical stop (7) at a stop position (M) is haltable, wherein upon change of the specific stroke position (E), the stop position (M) of the mechanical stop (7) is automatically adapted to the changed stroke position (E).
    公开号:AT514629A1
    申请号:T4442013
    申请日:2013-05-31
    公开日:2015-02-15
    发明作者:Stephan Eppich
    申请人:Engel Austria Gmbh；
    IPC主号:
    专利说明:

    The invention relates to a drive device, in particular a closing drive, for an injection molding machine, with an electric drive motor, a lifting element movable by the drive motor along a stroke, an electric stroke limiting device, by which the movement of the lifting element upon reaching a certain stroke position is haltbar, and a mechanical stroke limiting device , by the movement of the lifting element in case of malfunction of the electric stroke limiting device via a mechanical stop at a stop position is haltbar. In addition, the invention relates to an injection molding machine with such a drive device.
    In injection molding machines, various electric drive devices are used to move certain lifting elements (for example, a movable platen, a crosshead, an ejector, etc.). The lifting element moves along a defined stroke. The usual requirements in such drive devices are a working stroke (stroke), a maximum mechanical stroke, where the tool still suffers no damage, and a machine stroke to assemble or disassemble the tool can. When moving movable platens, this stroke depends on the size of the tool used and can therefore vary. Since very high forces often occur in injection molding machines, malfunctions in the movement of the lifting elements or other parts very large damage z. B. in the tools. In order to avoid such damage, electrical stroke limiting devices are already known by which the movement of the lifting element is stopped when reaching a certain stroke position. For this purpose, usually Wegmesssysteme be used.
    The problem, however, is that upon reaching this particular stroke position, the motor is switched off immediately, yet still a coasting or other movement can continue, which can lead to damage despite shut down drive. Especially when the maximum mechanical stroke is exceeded by such electric axes, very high damage costs can arise on the tool (eg stacking tool).
    In order to avoid this, mechanical stroke limiting devices are already known from the prior art by which not only the electric drive is interrupted in the case of such malfunctions, but also the movement of the lifting element is actively stopped mechanically. Such known stroke limits are usually threaded rods, which are adjusted by hand to a certain opening stroke. Other injection molding machines with double safety devices are known from the prior art, reference being made to DE 102 19 315 A1.
    Basically, in the known drive devices, which have both an electrical stroke limiting device and a mechanical stroke limiting device, the damage prevention is already quite good. It is cumbersome, however, that when changing a tool or other changes that affect the stroke, also a complex, time-consuming and labor-intensive manual adjustment of the mechanical stop must be made. In addition, the position of the mechanical stop is not monitored.
    The object of the present invention is therefore to provide a comparison with the prior art improved drive device. In particular, the drive device should be used variably and easily adapted to changed tool sizes.
    This is achieved by a drive device having the features of claim 1. Accordingly, it is provided that when changing the specific stroke position, the stop position of the mechanical stop is automatically adapted to the changed stroke position. Thus, the mechanical stop adapts automatically to the new stroke distance or to the new, specific stroke position, without having to dismantle a fixed stop or turn away.
    In principle, it is provided that the specific stroke position is dependent on the stroke distance. It is preferably provided that the specific stroke position can be set or determined via the electrical stroke limitation. For this purpose, for example, a displacement measuring system can be used and a test stroke be driven to determine the desired stroke distance and the dependent stroke position. Particularly preferably, these data are detected and stored via a control unit.
    According to a preferred embodiment, it is then provided that the stop position of the mechanical stop can be fixed as a function of the specific stroke position which can be set or determined via the electrical stroke limiting device. Thus, the mechanical stop is not manually set, but is automatically adjusted via the control unit. The stop position corresponds to the end of the maximum mechanical stroke of the lifting element. For setting the mechanical stop position, it is preferably provided that the mechanical stroke limiting device has an adjusting device for setting the maximum mechanical stroke. According to a first variant of this adjusting device it is provided that the adjusting device has a holding element with a plurality, preferably arranged at regular intervals, Einrastbereichen and a movable in one of the latching latch. According to a second, alternative variant, it can also be provided that the maximum mechanical stroke is infinitely adjustable via the adjusting device, wherein the adjusting device has a holding element with at least one clamping surface and at least one clamping jaw which can be fixed on the clamping surface of the holding element.
    In order not to generate excessive noise when reaching the mechanical stop or to cause damage due to the large forces in a mechanical stop, it is preferably provided that the mechanical stop via a damping device, preferably in the form of disc springs, is damped.
    Furthermore, it is preferably provided that the electrical stroke limiting device and / or the mechanical stroke limiting device have a displacement measuring system. In order to guarantee particularly good and double security, the displacement measuring systems of the electric stroke limiting device and the mechanical stroke limiting device are designed separately and independently of one another, so that the second displacement measuring system still functions in the event of damage to a displacement measuring system. In principle, the additional displacement measuring system assigned to the mechanical stroke limiting device serves to check the main path measuring system. If a difference in the paths is detected or one of the systems fails, an emergency stop is immediately triggered in the operation. In addition, the latch or jaw is activated via the adjusting device, since possibly because of a fault in the drive, the entire drive stops responding to an emergency stop.
    Protection is also desired for an injection molding machine with a drive device according to the invention.
    Further details and advantages of the present invention will be explained in more detail below with reference to the description of the figures with reference to the exemplary embodiments shown in the drawings, in which:
    1 shows an injection molding machine with an automatically adjustable mechanical stroke limiting device,
    2 shows details of the inactive mechanical stroke limiting device,
    3 shows details of the active mechanical stroke limiting device,
    Fig. 4 shows an alternative embodiment of a mechanical
    Hubbegrenzungsvorrichtung and
    Fig. 5 and 6 schematically a comparison of the variable mechanical stop at different lengths of stroke.
    In Fig. 1, an injection molding machine 2 is shown, which has as essential components the fixed platen 16, the guided on the bars 17 movable platen 15, the toggle mechanism 24 and the drive device 1 for moving the lifting element 4. The movable mold clamping plate 15 is movable along a guide rail 19 on the frame 18. In this
    Case when the drive device 1 is a closing drive, the drive spindle 22 forms together with the crosshead 23, the lifting element 4, which is driven to be translationally movable by the electric drive motor 3. From the drive motor 3, the drive spindle 22 and with this the crosshead 23 is moved via the spindle nut 25. With the crosshead 23, the toggle lever of the toggle mechanism 24, which connects the front plate 20 and the movable platen 15, movably connected. In the position shown in FIG. 1, the lifting element 4 is shown at one end of the stroke H, in which the mold halves forming the mold 31 are closed. In order to prevent damage when opening the tool damage throughout the drive train or in the area of the tool, on the one hand, the electric stroke limiting device 5 is provided, which determines by means of a displacement measuring system 21 and based on the rotational speed of the drive motor 3, if the driven stroke distance H with that of the electrical Drive motor 3 triggered movement path of the lifting element 4 matches. If there is a deviation or if the specific stroke position E is reached, the drive device 1 is switched off.
    Despite this shutdown but it can still cause damage, for which a mechanical stroke limiting device 6 is provided as the second security system. This mechanical stroke limiting device 6, in addition to the shutdown of the drive device 1 on reaching the specific stroke position E and a mechanical stop position M, at which the movement of the lifting element 4 is stopped. For this purpose, the mechanical stroke-limiting device 6 has a holding element 12 fastened to the lifting element 4 with a mechanical stop 7, which abuts against a retractable latch 11. In order to enable a variable adjustment of this stop position M, the adjusting device 9 is provided. This adjusting device 9 comprises a plurality of locking elements 10 formed on the holding element 12 and the movable latch 11.
    In detail, it can be seen from Fig. 2 that the latch 11 is in an inactive position in which it is still held by the drive mechanism 28 in a retracted position and is not retracted into one of the Einrastbereiche 10. Furthermore, it can be seen in FIG. 2 that the retaining element 12 overlies one another
    Bolt 26 is attached to the crosshead 23. In addition, a damping device 14 in the form of disc springs is formed between the crosshead 23 and the holding member 12, so that the holding member 12 is mounted movable relative to the crosshead 23 limited. In Fig. 2, the displacement measuring system 27 for the mechanical stroke limiting device 6 is additionally apparent, wherein a detection element of the displacement measuring system 27 abuts the crosshead 23.
    As soon as the mechanical stroke limiting device 6 is activated, the latch 11 is moved by the drive mechanism 28 according to FIG. 3, so that the latch 11 enters a latching region 10 of the holding element 12. As a result, the crosshead 23 can no longer move to the left during an opening movement of the drive device 1, since the holding element 12 abuts the latch 11 via the mechanical stop 7 and thus stops the crosshead 23 or the lifting element 4, optionally damped by the damping device 14 , By the mechanical stroke limiting device 6 thus the lifting element 4 is held in the stop position M. In Fig. 3 it can also be seen that the spindle 22 is connected via a bolt 29 fixed to the crosshead 23.
    In order to design the stop position M independently of the size of the snap-in areas 10, a stepless mechanical drive is shown in FIG
    Hubbegrenzungsvorrichtung 6 shown. In this case, the holding element 12 is held by its clamping surface K of clamping jaws 13. The jaws 13 are activated only when the electric stroke limiting device 5 stops the movement of the drive motor 3 and / or when the electric stroke limiting device 5 fails.
    The invention is again schematically illustrated in FIGS. 5 and 6. Basically, the lifting element 4 can be moved along the entire machine stroke HM by the drive device 1 via the electric drive motor 3. Driving this machine Hm is but usually only necessary and desirable if a tool change or other major repairs must be performed. In the operating state, only the same stroke distance H is ideally traveled by the lifting element 4. However, this stroke H can vary due to a wider or narrower tool. For this purpose, in Fig. 6, the stroke H longer than shown in Fig. 5. Depending on this stroke length H, the electrical stop 30 which corresponds to a specific stroke position E - which is preferably monitored by a displacement measuring system 21 - corresponds. As soon as the actually driven stroke H of the lifting element 4 reaches the specific stroke position E, the electric drive motor 3 is switched off. This takes place in that the reaching of the specific stroke position E is detected by the electric stroke limiting device 5 and a corresponding stop signal is forwarded to the electric drive motor 3 via the control or regulating unit 8.
    In order to prevent damage despite the stopped drive motor 3, a mechanical stroke limiting device 6 is additionally provided, by which a maximum mechanical stroke Hm is set for the lifting element 4. In the prior art, this maximum mechanical stroke Hm has always had to be changed manually, if the stroke H has changed due to a tool change. In order to remedy these disadvantages, it is provided according to the invention that when the specific stroke position E (or when the stroke H is changed), the stop position M of the mechanical stop 7 is automatically adaptable to the changed stroke position E. For this purpose, the mechanical stroke limiting device 6 is in signal communication with the control or regulating unit 8 or with the electric stroke limiting device 5, whereby the mechanical stop 7 is adjusted according to the changed stroke H. Thus, the present invention has the advantage that the mechanical stroke limiting device 6 automatically adapts to changed circumstances.
    Innsbruck, on May 29, 2013
    权利要求:
    Claims (11)
    [1]
    1. Drive device (1), in particular closing drive, for an injection molding machine (2), - an electric drive motor (3), - one of the drive motor (3) along a stroke (H) movable lifting element (4), - an electric stroke limiting device (5), by means of which the movement of the lifting element (4) can be halted upon reaching a specific lifting position (E), and - a mechanical stroke limiting device (6), by which the movement of the lifting element (4) in case of malfunction of the electric stroke limiting device (5) can be stopped by a mechanical stop (7) at a stop position (M), characterized in that when the specific stroke position (E) changes, the stop position (M) of the mechanical stop (7) can be automatically adapted to the changed stroke position (E).
    [2]
    2. Drive device according to claim 1, characterized in that the specific stroke position (E) of the stroke distance (H) is dependent and via the electrical stroke limiting device (5), preferably via a with the electrical stroke limiting device (5) in a signal-related control or control unit (8), is adjustable.
    [3]
    3. Drive device according to claim 2, characterized in that the stop position (M) of the mechanical stop (7) in dependence on the electrical stroke limiting device (5) adjustable or determined, certain stroke position (E) can be fixed.
    [4]
    4. Drive device according to one of claims 1 to 3, characterized in that the stop position (M) corresponds to the end of a maximum mechanical stroke (Hm) of the lifting element (4).
    [5]
    5. Drive device according to one of claims 1 to 4, characterized in that the mechanical stroke limiting device (6) has an adjusting device (9) for adjusting the maximum mechanical stroke (Hm).
    [6]
    6. Drive device according to claim 5, characterized in that the adjusting device (9) has a holding element (12) with a plurality, preferably arranged at regular intervals, latching areas (10) and one, in one of the Einrastbereiche (10) movable latch (11) ,
    [7]
    7. Drive device according to claim 5, characterized in that via the adjusting device (9) of the maximum mechanical stroke (Hm) is infinitely adjustable.
    [8]
    8. Drive device according to claim 7, characterized in that the adjusting device (9) has a holding element (12) with at least one clamping surface (K) and at least one on the clamping surface (K) of the holding element (12) fixable clamping jaw (13).
    [9]
    9. Drive device according to one of claims 1 to 8, characterized in that the mechanical stop (7) via a damping device (14), preferably in the form of disc springs, is damped.
    [10]
    10. Drive device according to one of claims 1 to 9, characterized in that the electrical stroke-limiting device (5) and / or the mechanical stroke-limiting device (6) have a displacement measuring system (21, 27).
    [11]
    11. Injection molding machine (2) with a drive device (1) according to one of claims 1 to 10. Innsbruck, 29 May 2013
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    同族专利:
    公开号 | 公开日
    AT514629B1|2015-03-15|
    DE102014007513A1|2014-12-04|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US6530313B1|1999-10-29|2003-03-11|Aida Engeneering Co., Ltd.|Slide locking mechanism|
    DE10219315A1|2001-05-11|2002-11-14|Engel Gmbh Maschbau|Plastic processing machine, especially an injection molding machine, with vertically movable platen has safety catch to prevent unintentional motion of a under gravity|CN112976470A|2021-04-02|2021-06-18|无锡安森源通讯科技有限公司|Auxiliary supporting device for base station antenna injection molding machine and using method|
    JP6538763B2|2017-07-04|2019-07-03|ファナック株式会社|Injection molding machine|
    法律状态:
    2021-01-15| MM01| Lapse because of not paying annual fees|Effective date: 20200531 |
    优先权:
    申请号 | 申请日 | 专利标题
    AT4442013A|AT514629B1|2013-05-31|2013-05-31|Drive device for an injection molding machine|AT4442013A| AT514629B1|2013-05-31|2013-05-31|Drive device for an injection molding machine|
    DE201410007513| DE102014007513A1|2013-05-31|2014-05-21|Drive device for an injection molding machine|
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