System of injection-moulding machine closing units

Abstract

A system of injection-moulding machine closing units is provided. In addition to two closing units of a first kind and third kind in a standard program, the closing units having closing forces F1 and F2, a further closing unit of a second kind having a closing force F1 is provided. The closing unit of the second kind forms an intermediate variable and is formed from components of the closing units of the first and third kind provided. The platens and the support plate with the dimensions of the closing unit of the third kind (closing force F2) and the toggle lever mechanism of the closing unit of the first kind (closing force F1) and the drive thereof are combined with one another. The articulated levers of the toggle lever mechanism of the closing unit of the second kind are hinged to the support plate and movable platen at a greater distance from the axis of symmetry than the articulated levers of the toggle lever mechanism of the closing unit of the first kind. The articulated levers themselves are identical. At the same time, the crosshead of the closing unit of the second kind is larger in the direction of the articulated levers of the toggle lever mechanism than the crosshead of the closing unit of the first kind such that the toggle lever mechanisms of the two closing units have the same kinematics.

Claims

1. A system of injection-machine closing units comprising two closing units, wherein each of the two closing units is constructed as a toggle lever closing unit, wherein each of the two closing units has a fixed platen, a movable platen (2a, 2b), a support plate (3a, 3b), a crosshead (5a, 5b) movable by means of a drive along the axis of symmetry (M) of the closing unit, and at least one toggle lever mechanism (6a, 6b, 7a, 7b) able to be actuated by means of the crosshead (5a, 5b), arranged between support plate (3a, 3b) and movable platen (2a, 2b) and articulatedly connected with these plates, wherein each of the two closing units is constructed according to a first closing force F1, wherein one of the two closing units is configured with platens (2a) of a first size and constitutes a closing unit of the first kind, wherein the other of the two closing units is equipped with platens (2b) of a second size and constitutes a closing unit of the second kind, wherein the platens (2b) of the closing unit of the second kind are larger than the platens (2a) of the closing unit of the first kind, in particular with respect to the tool clamping area, wherein the articulated levers (8a, 9a, 10a) of the toggle lever mechanism (6a, 7a) of the closing unit of the first kind and the articulated levers (8b, 9b, 10b) of the toggle lever mechanism (6b, 7b) of the closing unit of the second kind are constructed identically at least with respect to the length between the respective articulation points (P1, P2, P3, P4, P5) with articulated levers corresponding to one another with respect to their spatial arrangement in the respective closing unit, wherein the articulated levers (8b, 9b, 10b) of the toggle lever mechanism (6b, 7b) of the closing unit of the second kind are articulated at a greater distance to the axis of symmetry (M) at support plate (3b) and movable platen (2b) than the articulated levers (8a, 9a, 10a) of the toggle lever mechanism (6a, 7a) of the closing unit of the first kind, and wherein the crosshead (5b) of the closing unit of the second kind is constructed larger in the direction of the articulated levers (8b, 9b, 10b) of the toggle lever mechanism (6b, 7b) than the crosshead (5a) of the closing unit of the first kind, such that the toggle lever mechanisms of the two closing units have the same kinematics.

2. The system according to claim 1, wherein the articulated levers (8a, 9a, 10a) of the toggle lever mechanism (6a, 7a) of the closing unit of the first kind are articulated in a first distance to the axis of symmetry (M) at support plate (3a) and at movable platen (2a), that the articulated levers (8b, 9b, 10b) of the toggle lever mechanism (6b, 7b) of the closing unit of the second kind are articulated in a second distance to the axis of symmetry (M) at support plate (3b) and at movable platen (2b), wherein a distance difference (A, C, E) results between the second and the first distance, and wherein the crosshead (5b) of the closing unit of the second kind is constructed larger in the direction of the articulated levers (8b, 9b, 10b) of the toggle lever mechanism (6b, 7b) as a function of the distance difference (A, C, E) than the crosshead (5a) of the closing unit of the first kind, by the amount of the distance difference (A, C, E).

3. The system according to claim 1, wherein the crosshead (5a) of the first closing unit and the crosshead (b) of the second closing unit respectively have two fastening arrangements (joint pins and/or joint plates), which are constructed for the articulated fastening of an articulated lever, wherein the fastening arrangements lie symmetrically to the axis of symmetry (M), and wherein the distance between the articulation points of the fastening arrangements at the crosshead of the second closing unit is greater by a length L than the distance between the articulation points of the fastening arrangements at the crosshead (5b) of the first closing unit.

4. The system according to claim 3, wherein an upper and a lower fastening arrangement are provided respectively at the crosshead (5a) of the closing unit of the first kind and at the crosshead (5b) of the closing unit of the second kind.

5. The system according to claim 1, wherein the columns (11a) of the closing unit of the first kind and the columns (11b) of the closing unit of the second kind have the same diameter (D1=D2).

6. The system according to claim 1, wherein the drive for moving the crosshead (5a) of the first closing unit is identical with regard to its construction and its drive power to the drive for moving the crosshead (5b) of the second closing unit, wherein in particular identical motors are provided, e.g. electric or hydraulic motors.

7. The system according to claim 1 and with a further closing unit, wherein the further closing unit is constructed according to a second closing force F2 and constitutes a closing unit of the third kind, wherein the second closing force F2 is greater than the first closing force F1 of the closing units of the first and second kind.

8. The system according to claim 7, wherein the platens of the closing unit of the second kind and the platens of the closing unit of the third kind have the same height and/or the same width and/or the same thickness.

9. The system according to claim 7, wherein the support plate of the closing unit of the second kind and the support plate of the closing unit of the third kind have the same height and/or the same width and/or the same thickness.

10. The system according to claim 7, wherein the platens of the closing unit of the second kind have a tool clamping area which corresponds to the tool clamping area of the platens of the closing unit of the third kind plus an area portion of tool clamping area which is calculated from the difference between the diameter of the columns of the closing unit of the third kind and the diameter of the columns of the closing unit of the second kind.

11. The system according to claim 7, wherein the axis distance of the columns in the closing unit of the second kind is of equal size to the axis distance of the columns in the closing unit of the third kind.

12. The system according to claim 1, wherein the platens of the closing unit of the second kind are designed for the same maximum tool weight as the platens of the closing unit of the third kind.

13. The system according to claim 1, wherein at each closing unit, two pairs of articulated levers (6a, 7a, 6b, 7b) are provided, wherein the two pairs are arranged symmetrically to the axis of symmetry (M), and wherein the one pair is arranged above the axis of symmetry (M) and the other pair is arranged below the axis of symmetry.

14. The system according to claim 1, wherein on the machine bed (1a, 1b) of the respective closing unit, guide rails (12a, 12b) are provided for the movable platen (2a, 2b), wherein the axis distance of the guide rails (12a) in the closing unit of the first kind is smaller than the axis distance of the guide rails (12b) in the closing unit of the second kind, wherein the axis distance of the guide rails (12b) in the closing unit of the second kind is precisely as great as the axis distance of the guide rails in the closing unit of the third kind and wherein the base area of the machine bed in the closing unit of the second kind is precisely as great as the base area of the machine bed in the closing unit of the third kind.

15. The system according to claim 1, wherein the toggle lever mechanism is constructed as a 4-point toggle lever or as a 5-point toggle lever.

Description

[0029] The invention is to be described further below by means of an example embodiment and with reference to FIGS. 1a to 2b. There are shown:

[0030] FIG. 1a partial side view of the closing unit PX50

[0031] FIG. 1b partial side view of the closing unit PX51

[0032] FIG. 2a top view in PX50 onto the crosshead from the direction of the movable platen

[0033] FIG. 2b top view in PX51 onto the crosshead from the direction of the movable platen

[0034] Selected technical data for the PX50 and the PX51 are indicated in Table 1.

[0035] For comparable components, reference numbers with the addition a are used below for components of the PX50 and reference numbers with the addition b are used for components of the PX51.

[0036] FIGS. 1a and 1b show respectively a machine bed 1a, 1b, on which the components of the closing unit are mounted. In addition to a fixed platen, which is not illustrated, respectively a movable platen 2a, 2b and a support plate 3a, 3b are provided. For better clarity, the columns are not illustrated in FIGS. 1a and 1b. The movable platens 2a and 2b are supported displaceably by means of indicated sliding shoes 4a, 4b or suchlike on or against guide rails 12a, 12b on the respective machine bed 1a, 1b. Each closing unit comprises a crosshead 5a, 5b, which can be moved respectively by means of a drive, not illustrated, known per se, along the longitudinal axis M of the machine. In PX50 (FIG. 1a) and in PX51 (FIG. 1b) respectively a toggle lever mechanism is arranged, wherein an upper toggle lever mechanism 6a, 6b and a lower toggle lever mechanism 7a, 7b are provided. The upper toggle lever mechanism 6a of the PX50 comprises a first articulated lever 8a articulated on the support plate and a second articulated lever 9a articulated on the movable platen 2a. At the first articulated lever 8a a further articulated lever 10a is articulated, which at its end facing away from the articulated lever 9a is articulatedly connected with the crosshead 5a. The lower toggle lever mechanism 7a of the PX50 is constructed in the same manner and comprises the same articulated levers 8a, 9a and 10a.

[0037] The toggle lever mechanisms 6b and 7b of the PX51 have, in the same manner, articulated levers 8b, 9b and 10b. The articulated levers 8a, 9a and 10a of the PX50 and the articulated levers 8a, 9b and 10b of the PX51 are constructed identically, i.e. of equal length, at least with respect to their length between the articulation points. With respect to the articulated levers 10a or respectively 10b articulated on the crosshead, this means Z1=Z2. The remaining measurements are of rather secondary importance, therefore e.g. the thickness of the articulated levers. In the sense of the modular construction, however, it is advantageous if the articulated levers 8a, 9a and 10a of the PX50 as a whole are identical to the articulated levers 8b, 9b and 10b of the PX51. One and the same articulated levers can therefore be installed both in the PX50 and also in the PX51. The crosshead 5b of the PX51 (corresponding to the closing unit of the second kind) is constructed to be larger in the direction of the articulated levers of the toggle lever mechanisms 6b and 7b than the crosshead 5a of the PX50 (corresponding to the closing unit of the first kind). The enlargement refers here to the distance H between upper and lower articulation point. As can be seen from FIGS. 1a and 1b, the distance H2 in the case of the crosshead 5b is greater than the distance H1 in the case of the crosshead 5a. The difference between H2 and H1 is provided by the displacement of the articulation mechanisms. Compared with FIG. 1a, the articulation points of the articulated levers 8b in FIG. 1b have been shifted by a length C, and the articulation points of the articulated levers 9b have been shifted by a length E away from the longitudinal axis M of the machine. Consequently, the articulation points for the articulated levers 10b at the crosshead have shifted by a length A. The measurement of the displacement is identical, i.e. E=C=A. Resulting from this also is the difference between H2 and H1, namely such that H2=H1+2A. The crosshead 5b of the PX51 is constructed to be larger in the direction of the articulated levers of the toggle lever mechanisms 6b and 7b therefore by twice the measurement of the displacement of the articulation mechanisms than the crosshead 5a of the PX50. Through the fact that the measurement of the displacement at the support plate 3b and at the movable platen 2b is of equal size (C=E), the angle remains unchanged, which encloses the connection line of the two outer articulation points P1 and P2 with the longitudinal axis M of the machine. For the sake of simplicity, the angle in FIG. 1 is illustrated with respect to a line lying parallel to the longitudinal axis M of the machine. As a whole, the result is therefore that the toggle lever mechanisms of the two closing units have the same kinematics.

[0038] In FIGS. 2a and 2b, the columns 11a and 11b are drawn and their diameters are indicated by D1 in the case of the PX50 and by D2 in the case of the PX51. The diameter of the columns is identical in PX50 and PX51, i.e. D1=D2. The enlargement of the crosshead in the direction of the articulated levers can also be seen from the illustration in FIGS. 2a and 2b, i.e. H2=H1+2A. The width B1 or respectively B2 of the respective crosshead is not relevant, i.e. B1 can be of equal size to B2, or different, as illustrated in the present case.

[0039] For the sake of completeness, it is to be noted that all the measurements in the context of the toggle lever mechanism(s) always go to the rotation axis at the respective articulation points P1 to P5. The reference numbers P1 to P5 therefore designate in FIGS. 1a and 1b the position of the rotation axis in the respective articulations.

TABLE-US-00001 TABLE 1 Commonalities A = common between PX50 and PX51 (Commonalities B) = common between PX51 and PX80 PX50 PX51 PX80 Note Closing force 500 500 800 .sub.[KN] Tool weight 450 (750) (750) [Kg] Columns axis 425 375 (490 440) (490 440) h v [mm] distance Columns inside 370 320 435 385 420 370 h v [mm] width Platens FWAP 620 560 (700 645) (700 645) h v [mm] BWAP 575 500 (655 588) (655 588) h v [mm] Support plate 800 590 (870 685) (870 685) h v [mm] Thickness FWAP, 155 (175) (175) [mm] BWAP and support plate Toggle lever mechanism Crosshead 251.2 321.2 288 Upper to lower joint pin distance at crosshead [mm] Drive Motor 1 Motor 1 Motor 2 Drive motor crosshead Articulation 1 295 295 340 Articulation eyes distance [mm] Articulation 2 197 197 227 Articulation eyes distance [mm] Articulation 3 118 118 136 Articulation eyes distance [mm] Machine bed 2000 650 (2300 700) (2300 700) Machine bed base area (closing unit) [mm] Guide rails axis 474 554 554 [mm] distance BWAP Columns 55 55 70 Column diameter [mm]

LIST OF REFERENCE NUMBERS

[0040] 1a, 1b machine bed [0041] 2a, 2b movable platen [0042] 3a, 3b support plate [0043] 4a, 4b sliding shoes [0044] 5a, 5b crosshead [0045] 6a, 6b upper toggle lever mechanism [0046] 7a, 7b lower toggle lever mechanism [0047] 8a, 8b articulated lever to the support plate [0048] 9a, 9b articulated lever to the movable platen [0049] 10a, 10b articulated lever to the crosshead [0050] 11a, 11b columns [0051] 12a, 12b guide rails