JPH0227967Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The present invention relates to a mold clamping position detection device for controlling mold clamping speed in a mold clamping mechanism of a die casting machine.

[Prior art]

As shown in FIG. 1, a conventional toggle plate 13 is attached to the tip of a piston rod 12 of a mold clamping cylinder 11 as a position detection device for a mold clamping cylinder.
A guide bar 14 that moves parallel to the mold clamping cylinder 11 is provided, and the guide bar 14 controls a plurality of limit switches, such as a mold opening limit switch 15, a high mold clamping speed switch switch 16, a low mold clamp speed switch switch 17, and a mold clamp switch. This was done by pressing the button 18 etc.
Note that 19 is a link housing, 20 is a movable die plate, 21 is a fixed die plate, 22 is a tie bar, and 23 is a toggle mechanism.

However, in this type of system, as the mold clamping stroke becomes longer, the guide bar 14 also becomes longer and bends, making it difficult to move smoothly, and it is impossible to arrange the limit switches at intervals narrower than the width of the limit switches. , it was impossible to detect distances shorter than the width of the limit switch.

[Purpose of invention]

The present invention eliminates these drawbacks, and its purpose is to provide a position detection device for a mold clamping mechanism of a die-casting machine that operates smoothly and can detect the position even at a short distance.

[Key points of the idea]

The position detection device of the mold clamping mechanism of a die casting machine according to the present invention includes a link rotated by a mold clamping cylinder to move a movable die plate, a pin fixed to a ring housing or a movable die plate to support the link, and a link. It is characterized by comprising an arm attached to the pin, and a rotary encoder attached to the center of the pin and whose rotor is rotated by the arm.

[Example of idea]

The present invention will be explained below with reference to FIGS. 2 and 3 showing one embodiment. FIG. 2 is a schematic diagram of a general die casting machine, in which a tie bar 34 is stretched between a fixed die plate 32 to which a fixed mold 31 is fixed and a ring housing 33 to which a mold clamping cylinder 11 is fixed. A movable die plate 36 to which a movable mold 35 is fixed is supported and guided by tie bars 34 and moves in the left-right direction in the figure.
The figure shows the mold opening limit. Movement of the movable die plate 36 is transmitted from the piston rod 12 of the mold clamping cylinder 11 to the movable die plate 36 via the toggle mechanism 37. The toggle mechanism 37 includes a toggle plate 3 fixed to the tip of the piston rod 12.
Link A39 pin-connected from 8 and link A3
9, and a link C41 which is pin-coupled to one end of the link B40 and the movable die plate 36. In the figure, 42 is an injection mechanism.

Details of the toggle mechanism will be explained with reference to FIG. One end of the link B40 is rotatably supported by a pin A51 fixed to the ring housing 33.
One end of the link C41 is rotatably supported by a pin B52 fixed to the movable die plate 36, and a link B is attached to the other end of the link C41 via a pin C53 fixed thereto.
The other end of 40 is rotatably supported. In the figure, link A39 extends vertically downward from the page.
Further, one end of the pin A51 is covered with a lid 54 fixed to the ring housing 33.
4, a rotary encoder 55 is attached to the center of pin A51. and rotary encoder 5
The rotor 5 (not shown) is connected to one end of the arm 56 attached to the link B40, so when the link B40 rotates, the rotor rotates via the arm 56 and transmits a signal. being done. In addition, arm 56 is link C41
Alternatively, the rotary encoder 55 may be attached to the center of the pin B52.

Next, the operation of the embodiment described above will be explained. When the mold clamping command is issued, the piston rod 12 of the mold clamping cylinder 11 moves forward (rightward in FIG. 2), so the link B40 rotates counterclockwise, and this rotation is transmitted to the rotary encoder 55 via the arm 56. The rotation angle is transmitted from the rotary encoder 55 every moment. That is, since the forward position of the movable die plate 36 is transmitted from the rotary encoder 55 every moment, the position can be read by receiving the signal.

[Effect of idea]

As mentioned above, the position detection device of the die-casting machine mold clamping mechanism in the present invention rotates the rotor of the rotary encoder via the arm attached to the link B that rotates to move the movable die plate forward and backward. Therefore, as the movable die plate moves, the rotary encoder emits signals from time to time, and when this signal is received, the position of the movable die plate can be accurately detected. Since detection is performed using a rotary encoder, even if the mold clamping stroke becomes long, there is no problem with deflection as in conventional methods, and any short distance can be detected, and the mechanism is simple and costs are low. have

[Brief explanation of drawings]

FIG. 1 is a side view of a conventional die-casting machine, FIG. 2 is a mechanical diagram of a general die-casting machine, and FIG. 3 is a sectional view showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 11...Mold clamping cylinder, 33...Ring housing, 36...Moving die plate, 40...Link A, 51...Pin A, 55...Rotary encoder, 56...Arm.

Claims (1)

[Scope of utility model registration request] A link rotated by a mold clamping cylinder to move the movable die plate, a pin fixed to the ring housing or the movable die plate to support the link, an arm attached to the link, and an arm attached to the center of the pin. and a rotary encoder whose rotor is rotated by the arm. A position detection device for a die-casting machine mold clamping mechanism.