CN210240149U - Forming machine - Google Patents

Abstract

The utility model relates to a forming machine, the hydraulic system of which is provided with an oil tank (2) and a reflux part (3). A centrifugal separator (4) is arranged in the return section before the inlet into the tank. The centrifugal separator has at least two outlet openings, a first outlet opening (5) for the volume fraction of the treated hydraulic oil having foreign bodies with a density lower than that of the hydraulic oil and a second outlet opening (6) for the volume fraction of the treated hydraulic oil having foreign bodies with a density higher than that of the hydraulic oil. The first outlet opening opens into a first region (7) of the tank and the second outlet opening opens into a second region (8) of the tank. Hydraulic oil can be delivered from the second region to the filter (10) by means of a pump (9). The tank has a chamber into which the first outlet opening and the second outlet opening open and which is arranged such that no significant mixing of the volume fractions flowing into the chamber via the first outlet opening and the second outlet opening takes place.

Description

Forming machine

Technical Field

The utility model relates to a forming machine.

Background

The embodiments of hydraulic systems today work with filters that are installed in different locations in the hydraulic system. They should filter contaminants such as solids, particulates, oil aging products and water.

A filter of this kind is known from US2004/0099595A 1.

By arranging the filter in the hydraulic system, the entire volume flow or only a part of the volume flow of the hydraulic oil is filtered, wherein the volume flow can be obtained from one or more pumps (main pump) or also only from smaller pumps (secondary pump, filter pump). In this case, depending on the arrangement of the filter, a suction filter, a line filter and a return filter are distinguished. The characteristic feature here is that the volume flow guided through the filter is dependent on the delivery volume of the pump and the switching position of the valve.

"Filter" in this disclosure means an element based on sieving action, such as filter block filtration or deep bed filtration.

The mentioned filters have the drawback that:

a suction filter: high power requirements due to cavitation tendency of filtration resistance;

a pipeline filter: expensive due to the high pressure construction required, filtration resistance varies significantly with time and temperature, high power requirements;

a reflux filter: filtration resistance varies significantly with time and temperature, high power requirements.

In addition to such filters, centrifugal force separators (in particular so-called hydrocyclones) are also known, by means of which solid particles contained in a liquid or a gas can be separated or classified. Emulsions, such as oil and water mixtures, may also be separated. The inflowing medium flows here tangentially into the centrifugal separator in the upper region, so that the mixture is forced onto a circular path. By the different densities of the materials, the heavier components are forced more outward than the lighter components. The lighter fraction then rises upwards and leaves the centrifugal separator through the first discharge opening, while the heavier fraction migrates downwards as a function of gravity and leaves the centrifugal separator through the second discharge opening.

SUMMERY OF THE UTILITY MODEL

It is an object of the present invention to provide a molding machine in which at least one of the problems discussed above is avoided.

The object is achieved by a molding machine having a hydraulic system with at least one oil tank for hydraulic oil and at least one return for hydraulic oil which is connected to the oil tank via an inlet opening; at least one centrifugal separator is arranged in the at least one return part before the inlet of the at least one oil tank for returning the hydraulic oil to the oil tank; the at least one centrifugal force separator has at least two outlet openings for the treated hydraulic oil, wherein a first outlet opening is used for the volume fraction of the treated hydraulic oil having foreign bodies with a density lower than that of the hydraulic oil, and a second outlet opening is used for the volume fraction of the treated hydraulic oil having foreign bodies with a density higher than that of the hydraulic oil; a first outlet opening opens into a first region of the at least one tank and a second outlet opening opens into a second region of the at least one tank; a pump is provided, by means of which hydraulic oil can be conveyed from the second region of the at least one oil tank to the filter; the at least one tank has a chamber into which a first outlet opening and a second outlet opening open, wherein the first outlet opening and the second outlet opening are arranged such that no significant mixing of the volume fractions flowing into the chamber via the first outlet opening and the second outlet opening takes place.

By suitable arrangement of the two outlet openings, it is ensured that no significant mixing of the inflowing volume fractions takes place.

In this context, "no significant mixing" means that unavoidable physical mixing processes in the form of diffusion on a microscopic level are possible.

The laminar flow into the tank is promoted by means for calming the flow, such as a diffuser. However, the hydraulic oil provides a sufficiently high viscosity in order to ensure laminar inflow into the tank and to prevent mixing of the adjusted volume fractions of the hydraulic oil, also without using special means for flow flattening.

In the present invention, the basic idea of innovation is as follows:

a volume fraction having foreign matter of a density less than that of the oil can be introduced near the liquid level of the oil tank, which, in addition, promotes the discharge of exhaust gas, such as air;

the volume fraction of foreign bodies having a greater density than the oil can be introduced in such a way that it can be completely or at least largely sucked up by a pump which leads to the filter.

The utility model has a series of advantages:

all particles accumulate only in a partial volume of the treated hydraulic oil and can therefore be filtered more effectively. This allows for a better and more efficient filtering and/or a smaller delivery volume of the pump delivering the treated hydraulic oil to the filter.

The system according to the invention is very effective in particular in the case of large particles which may cause increased wear in the components of the molding machine and may lead to direct machine shutdowns.

-the bubbles reach the surface of the at least one tank or the surface of the second tank more quickly.

Less pressure loss occurs than when using conventional filters.

Replacement of the filter (in the hydrocyclone) is not necessary.

The particles from the system are immediately separated.

As regards the centrifugal force separator, preferably a hydrocyclone, it can be constructed as described above for the prior art. Additionally, the electromagnetic field applied in the hydrocyclone may support separation or conditioning by centrifugal force. Hydrocyclones may have a stationary or rotating outer wall that is driven mechanically or by flow forces.

In one embodiment of the invention, it is provided that the at least one oil tank has at least a first chamber and a second chamber which are separated from one another in terms of flow, and that the first outlet opening opens into the first chamber and the second outlet opening opens into the second chamber, the separation in terms of flow being at least to the extent: the passage of foreign matter having a density greater than that of the hydraulic oil is prevented.

In an embodiment of the invention, at least two return lines for hydraulic oil are provided, wherein the at least two return lines open into a front chamber, from which a return line provided with a centrifugal separator opens into the at least one oil tank, preferably wherein the front chamber has a smaller volume than the at least one oil tank.

In one embodiment of the invention, it is provided that at least one diffuser is arranged at least one outlet opening of the at least two outlet openings or in the surroundings for reducing the flow velocity.

In one embodiment of the invention, it is provided that at least one perforated plate is arranged at least one outlet opening of the at least two outlet openings or in the surroundings for reducing the flow rate.

By using at least one diffuser at the outlet opening and/or at least one perforated plate at the outlet opening or in the surroundings, a reduction in the flow speed is ensured and a mixing of the adjusted volume fractions of the hydraulic oil is prevented to a high degree.

In one embodiment of the invention, it is provided that at least one guide plate is arranged at least one outlet opening of the at least two outlet openings or in the surroundings for reducing the flow speed and/or for guiding the flow.

By arranging at least one guide plate in the vicinity of both discharge openings, which guide the flow of the regulated hydraulic oil and/or reduce the flow speed, the prevention of mixing of the regulated volume fractions of the hydraulic oil is ensured to a higher degree.

In one embodiment of the invention, it is provided that at least one partial separating plate is arranged at least one outlet opening of the at least two outlet openings or in the surroundings.

By using a partial separating plate, the mixing of the adjusted volume fractions of the hydraulic oil is prevented to a high degree.

The mixing of the adjusted volume fractions of the hydraulic oil can be ensured, for example, by measures which prevent convection and/or turbulence and/or density differences and/or temperature differences.

The front chamber can be designed to be closed or open in the present invention. Here, closed or open means whether the front chamber is of closed or open design relative to the environment and therefore an overpressure can or cannot be present in the front chamber.

In the present invention, it can be provided that the volume fraction of the treated hydraulic oil, which has foreign bodies with a lower density than the hydraulic oil, can be conveyed by the pump via the inflow to the filter and/or the cooler. In this case, it can be provided that the filtered and/or cooled hydraulic oil can be supplied to the at least one oil tank or to a separate oil chamber. If the oil is supplied to the at least one tank, a flow-technical separation should be provided, by means of which at least the passage of foreign bodies having a greater density than the hydraulic oil is avoided.

In a preferred embodiment of the invention, in particular when only one tank or a separate chamber is provided, means for calming and deflecting the flow (for example a diffuser) are provided in the region of the opening. They ensure laminar inflow into the tank.

The filtered and possibly cooled hydraulic oil can be fed by at least one pump via at least one inlet to a component of the molding machine to be supplied, which is connected to a return of the hydraulic system.

Drawings

Embodiments of the invention are discussed with the aid of the figures. The attached drawings are as follows:

figure 1 is a diagrammatic view of a first embodiment of the invention;

FIG. 2 is a diagrammatic view of a second embodiment not in accordance with the invention;

fig. 3 is a diagrammatic view of a third embodiment of the invention;

FIG. 4 is a block diagram of a first hydraulic system according to the present disclosure;

fig. 5 is a block diagram of a second hydraulic system according to the present invention;

fig. 6a to 6d are schematic illustrations of technical realizations of different embodiments of measures for reducing the mixing of the adjusted volume fractions of the hydraulic oil to an increased extent.

Detailed Description

The components shown in a certain number in the figures can of course also be provided in other numbers.

Fig. 1 shows a detail of an embodiment of a hydraulic system 1 of a molding machine, in particular an injection molding machine, according to the invention.

A tank 2 for hydraulic oil is visible, which is connected via two inlet openings to a first outlet opening 5 and a second outlet opening 6 of a centrifugal separator 4 (see fig. 4). The first outlet opening 5 delivers a volume fraction of the treated hydraulic oil in which foreign bodies are present, which have a lower density than the hydraulic oil. The second outlet opening 6 conveys a volume fraction of the treated hydraulic oil in which foreign bodies are present, the density of which is higher than that of the hydraulic oil.

The first outlet opening 5 opens into a first region 7 of the tank 2. The second outlet opening 6 opens into a second region 8 of the tank 2. These regions 7, 8 are separated from one another by an obstacle in the two chambers 11, 12, wherein region 7 is formed by chamber 11 and region 8 by chamber 12. A discharge opening of the tank 2 leads to a further chamber 12', which is arranged here outside the tank 2, but can also be arranged inside the tank. The further chamber 12' serves for supplying hydraulic oil treated by the centrifugal separator 4 for the pump 9 (see fig. 4).

The two outlet openings 5, 6 are visible here in the form of the outlet openings 5, 6 arranged one above the other, the suitable arrangement of these two outlet openings ensuring that a mixing of the adjusted volume fractions of the hydraulic oil is prevented.

Two partial separating plates 21 are arranged partially between the chambers 11 and 12, which ensure to a high degree the prevention of the mixing of the adjusted volume fractions of the hydraulic oil.

Fig. 2 shows a detail of another embodiment of a hydraulic system 1 of a molding machine, in particular an injection molding machine. The difference to the exemplary embodiment of fig. 1 is that two separate oil tanks 2,2 'are provided, and the first outlet opening 5 of the centrifugal force separator 4 opens into the first oil tank 2, and the second outlet opening 6 of the centrifugal force separator 4 opens into the second oil tank 2'. A discharge opening of the tank 2 and a discharge opening of the tank 2 ' each open into a further chamber 12 ', which here is located outside the tank 2,2 '. The further chamber 12' serves for supplying hydraulic oil treated by the centrifugal separator 4 for the pump 9 (see fig. 4), but this is not necessarily required.

Fig. 3 shows a variant of fig. 1, in which a component 16 (for example a diffuser 18) for calming and deflecting the flow is additionally provided. Said means ensure that no significant mixing of the volume fractions flowing into the chamber of the tank 2 via the first discharge opening 6 and the second discharge opening 7 occurs, although no obstacles are arranged within the tank 2. The means 16 for calming and diverting the flow ensure a laminar inflow of the hydraulic oil into the oil tank 2 and prevent mixing of the hydraulic oil flowing into the oil tank 2 via the outlet openings 5, 6 of the centrifugal separator 4.

Fig. 4 shows a hydraulic system 1 of a molding machine, in particular an injection molding machine, according to the invention.

A plurality of return ducts 3 (in the figure, four are shown by way of example, but there may be any number), three of which 3 open into a front chamber 13 from which one provided with a centrifugal separator 4 opens into the oil tank 2. The front chamber 13 preferably has a smaller volume than the tank 2. The front chamber 13 collects the hydraulic oil of the return 3 and ensures a more uniform flow through the centrifugal separator 4.

The oil tank 2 has a plurality of chambers 11, 12' (for example four are depicted), as shown in fig. 1. Via the pump 9, hydraulic oil can be supplied from the second chamber 12 of the oil tank 2 to the filter 10 and subsequently to the cooler 15. The filtered and cooled hydraulic oil is supplied to a chamber 12', which is connected to the first chamber 11 in terms of flow. Hydraulic oil can be supplied from the other chamber 12' via a pump 9 (of course several pumps 9 can be provided) acting as a main pump via an inlet 14 (of course, different from what has been described, any number of inlets 14 can be provided) to the component 17 of the molding machine to be supplied, which is connected to the return 3.

In the variant of fig. 5, no front chamber 13 is provided. Only one return 3 is shown here by way of example, but a plurality of return 3 can of course be provided.

It can be noted with regard to fig. 1 to 3 that the connection to the pump 9 and subsequently to the filter 10 shown in fig. 4 and 5 can be realized in the region 8 or in a lower section of the chamber 12.

Fig. 6a shows a detail of an embodiment of a hydraulic system 1 of a molding machine, in particular an injection molding machine, wherein the first discharge opening 5 and the second discharge opening 6 are arranged such that the first discharge opening 5 is located above the second discharge opening 6.

The arrangement of the two outlet openings 5, 6 ensures, by virtue of the high viscosity of the hydraulic oil, that no significant mixing of the volume quantities (not depicted for general reasons) flowing into the chamber via the first outlet opening 5 and the second outlet opening 6 occurs.

Fig. 6b shows a detail of an embodiment of a hydraulic system 1 of a molding machine, in particular an injection molding machine, wherein the left side shows a side view and the right side shows a view from above.

An orifice 19 is arranged around the first outlet opening 5, which reduces the flow rate of the regulated hydraulic oil. The perforated plate 19 can also be arranged above further discharge openings, not depicted.

The perforated plate 19 can be arranged partially or completely around one of the at least two outlet openings 5, 6. The perforated plate 19 may extend over the entire extension of the fuel tank 2 or over a part of the fuel tank 2.

Fig. 6c shows a detail of an exemplary embodiment of a hydraulic system 1 of a molding machine, in particular an injection molding machine, from two perspectives, comprising an orifice plate 19, which orifice plate 19 is arranged in a plane differently from the orifice plate in the exemplary embodiment shown in fig. 6b, in order to avoid a mixing of the adjusted volume fractions of the hydraulic oil to a high degree.

Fig. 6d shows a detail of an embodiment of the hydraulic system 1 of a molding machine, in particular an injection molding machine, in two views, wherein a guide plate 20 is provided in the vicinity of the first discharge opening 5. The number of guide plates 20 is generally arbitrary. Particularly preferably, the number of guide plates 20 ensures a sufficient reduction of the flow speed and/or a diversion of the flow and/or a moderate hindrance of the flow of the adjusted volume fraction.

The guide plate 20 ensures a turning of the flow and/or a reduction of the flow speed, thus preventing the mixing of the adjusted volume fractions of the hydraulic oil to a high degree.

List of reference numerals

1 a hydraulic system for a hydraulic system, wherein,

2, 2' of the oil tank,

3 a return part for returning the liquid to the liquid tank,

4, a centrifugal force separator is arranged in the chamber,

5a first discharge opening of the centrifugal separator,

6a second discharge opening of the centrifugal separator,

7 the first region of the tank is,

8-a second region of the tank,

9 a pump is arranged on the upper portion of the shell,

10 a filter for the filtration of water, the filtration device,

11 the first chamber of the tank is,

12 the second chamber of the tank and,

12' the third chamber of the tank,

13 a front chamber, a rear chamber,

14 a flow-in part of the water tank,

15 a cooling device for the cooling device, wherein,

16 means for calming and diverting the flow,

17 of the parts to be supplied,

18 a diffuser (a) for diffusing the air,

a 19-hole plate is arranged on the upper surface of the shell,

20 a guide plate for guiding the flow of air,

21 partial separation plate.

Claims (12)

1. A molding machine has a hydraulic system (1) with at least one oil tank (2) for hydraulic oil and at least one return (3) for hydraulic oil which is connected to the oil tank (2) via an inlet opening;

at least one centrifugal separator (4) is arranged in the at least one return part (3) before the inlet into the at least one oil tank (2) for returning the hydraulic oil into the oil tank (2);

the at least one centrifugal separator (4) has at least two outlet openings (5, 6) for the treated hydraulic oil, wherein a first outlet opening (5) is used for the volume fraction of the treated hydraulic oil having foreign bodies with a density lower than the hydraulic oil, and a second outlet opening (6) is used for the volume fraction of the treated hydraulic oil having foreign bodies with a density higher than the hydraulic oil;

the first outlet opening (5) opens into a first region (7) of the at least one tank (2) and the second outlet opening (6) opens into a second region (8) of the at least one tank (2);

a pump (9) is provided, by means of which hydraulic oil can be conveyed from the second region (8) of the at least one oil tank (2) to the filter (10);

characterized in that the at least one tank (2) has a chamber into which a first outlet opening (5) and a second outlet opening (6) open, wherein the first outlet opening (5) and the second outlet opening (6) are arranged such that no significant mixing of the volume fractions flowing into the chamber via the first outlet opening (5) and the second outlet opening (6) occurs.

2. Moulding machine according to claim 1, characterized in that the at least one oil tank (2) has at least a first chamber (11) and a second chamber (12) which are separated from each other in terms of flow, and in that the first discharge opening (5) opens into the first chamber (11) and the second discharge opening (6) opens into the second chamber (12), at least to the extent that: the passage of foreign matter having a density greater than that of the hydraulic oil is prevented.

3. The molding machine according to claim 1 or 2, characterized in that at least two return ducts (3) for hydraulic oil are provided, wherein the at least two return ducts (3) open into a front chamber (13), from which the one return duct (3) provided with the centrifugal separator (4) opens into the at least one oil tank (2).

4. The molding machine according to claim 1 or 2, characterized in that the centrifugal separator (4) is constructed as a hydrocyclone.

5. Moulding machine according to claim 1 or 2, characterized in that at least one diffuser (18) is provided at least one of the at least two discharge openings (5, 6) or in the surroundings for reducing the flow speed.

6. Moulding machine according to claim 1 or 2, characterized in that at least one orifice plate (19) is provided at least one of the at least two outlet openings (5, 6) or in the surroundings for reducing the flow speed.

7. Moulding machine according to claim 1 or 2, characterized in that at least one guide plate (20) is provided at least one of the at least two outlet openings (5, 6) or in the surroundings for reducing the flow speed and/or for guiding the flow.

8. Moulding machine according to claim 1 or 2, characterized in that at least one partial separating plate (21) is arranged at least one of the at least two discharge openings (5, 6) or in the surroundings.

9. A machine according to claim 1 or 2, characterized in that the volume fraction of the treated hydraulic oil having foreign bodies of lower density than the hydraulic oil can be conveyed by the pump (9) via the inflow (14) to the filter (10) and/or the cooler (15).

10. The molding machine according to claim 9, characterized in that filtered and/or cooled hydraulic oil can be delivered to the at least one oil tank (2) or a separate oil chamber.

11. A molding machine according to claim 1 or 2, characterized in that the molding machine is an injection molding machine.

12. A machine according to claim 3, wherein said front chamber (13) has a smaller volume than said at least one tank (2).

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