JPH03210957A - Toggle type injection forming machine - Google Patents

Abstract

PURPOSE:To detect galling developed on a toggle pin by detecting an elastic wave generated at the time of developing the galling on the toggle pin with ultrasonic wave sensor and comparing this detected signal with the reference signal with a comparator. CONSTITUTION:In a toggle type injection forming machine, a second link group 11 is pushed with a cylinder device 9 and further, a first link group 10 is pushed with the second link group to execute die clamping of dies 6, 7. Then, in a toggle link 14 in the first link group 10, the ultrasonic wave sensor 20 is arranged and galling detecting circuit is set, e.g., at the P position in the second link group 11. The die clamping is executed in this constitution and at the time of developing the galling on the toggle pin 13, this elastic wave is detected with the ultrasonic wave sensor 20, and the detected signal is inputted to a pulse generator through a preamplifier, band filter and main amplifier. In here, the detected signal is made to pulse signal and counted with a pulse counter and at the time of being more than number of the set pulse, the galling detected signal is outputted. By this method, the galling on the toggle pin 13 can be easily detected and the recovery can be executed in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mold clamping device for a molding machine such as a die casting machine or an injection molding machine.

(Conventional technology) A conventional toggle injection molding machine is shown in FIG.

In FIG. 5, a fixed platen 2 and an end platen 3 are fixed on both ends of the machine base 1, both ends of a tie bar 4 are attached to both platens 2 and 3, and a movable platen 5 is slidable on the tie bar 4. The molds 6.7 are fitted to the movable platen 5 and the fixed platen 2, respectively, and a trouble device 8 for clamping the molds 6.7 is provided between the movable platen 5 and the end platen 3. The end platen 3 is provided with a cylinder device 9 for driving the trouble device 8 to clamp the mold.

The trouble device 8 includes a plurality of first link groups 10 that connect the end platen 3 and the movable platen 5, and a second link group 11 that connects the first link groups 10.
When the link group 11 is pushed by the cylinder device 9 and approaches the most extended state, the first link group 10 is pushed by the second link group 11 and approaches the most extended state, thereby generating a large mold clamping force.

The first link group 10 of the trouble device 8 is normally provided integrally with the end platen 3 and the movable platen 5, respectively, and is rotatable via a doggle pin 13 on the tosoggle link mounting section 12 and the tosoggle link mounting section 12, respectively. For example, as shown in FIG. 6, the toggle link attachment is provided with keyways 15 and 16 on the outer end surface of the portion 12 and the end surface of the doggle pin 13, respectively, and the toggle pink attachment is provided with keyways 15 and 16, respectively. Plate 1 fixed to the outer end surface of section 12 with screws 17
A protrusion 19 that fits into the keyway 15, 16 is provided integrally with the plate 18 on the inner surface of the plate 18.

[Problem to be solved by the invention]

The above-described mold clamping device can generate a large mold clamping force with a small input, and is therefore widely used in tosoggle molding machines such as die casting machines and injection molding machines. However, since the load on the tongle pin 13 is large, the lubricant runs out or overload occurs, and the tongle pin 13
There have been cases where "galling" has occurred between the trouble link 14 and the trouble link 14. If work is continued in a state where galling occurs, the mVt of the work may become impossible due to seizure, etc., and it may take a long time to recover.

The present invention has been made in view of these points, and its object is to provide a trouble-type injection molding machine that can detect galling that occurs in the tongle pins.

[Means to solve the problem]

To achieve this purpose, the present invention provides an ultrasonic sensor that detects elastic waves generated when a tongle pin is bitten, and a comparison device that outputs a signal when the detection signal of this ultrasonic sensor is larger than a reference signal. It is designed to have a container.

[Effect]

In the trouble-type injection molding machine according to the present invention, it is possible to detect galling that occurs in the doggle pin.

〔Example〕

FIG. 1 is a configuration diagram showing a trouble-type injection molding machine according to the present invention, and 20 is an ultrasonic sensor.

In FIG. 1, the same or equivalent parts as in FIG. 4 are given the same reference numerals. Also, Figure 2 shows trouble link 14.
FIG. 2 is an assembly diagram showing an ultrasonic sensor 20 in FIG.

Further, FIGS. 3 and 4 are system diagrams showing the galling detection circuit. This galling detection circuit is installed at a suitable position (for example, position P) in the apparatus shown in FIG.

Next, the operation of this embodiment will be explained using FIG. 3. In FIG. 3, 20 is an ultrasonic sensor, 21 is an amplifier, 22 is a comparator, 23 is a pulse generator, and 24 is a pulse counter. The sensor signal a output from the ultrasonic sensor is amplified by an amplifier 21 to become a signal. Comparator 22
compares the level of the signal with the reference level, and if the level of the signal is higher than the reference level, the signal C of the rHJ level
Output. The value of the reference level is set to be slightly smaller than the amplitude of the elastic wave generated when the tongle pin 13 bites. While the rHJ level signal C is being output, the pulse generator 23 generates pulses d at predetermined intervals, and the pulse counter 24 counts the number of pulses d, and when this count number exceeds the predetermined count number. At the same time, a galling detection signal e is output. However, it is assumed that the pulse counter 24 is reset to the timing of galling detection.

FIG. 4 is a system diagram showing another processing circuit for the sensor signal a, and the operation up to the comparator 22 is the same as that in FIG. 3. The pulse width comparator 25 outputs r output from the comparator 22.
When the continuous generation time of the HJ level signal C is longer than a predetermined time, a galling detection signal e is output.

In the above embodiment, the ultrasonic sensor 20 is installed at one location in the injection molding machine, but it may be installed at a plurality of locations as necessary, for example, at four locations between the doggle pins 130. Furthermore, a frequency filter may be provided before or after the amplifier to pass only signals of necessary frequencies. Furthermore, by outputting the galling detection signal e to an alarm device, the alarm device may sound when galling occurs.

〔Effect of the invention〕

As explained above, the present invention includes an ultrasonic sensor that detects elastic waves generated when a tongle pin is bitten, and a comparator that outputs a signal when the detection signal of this ultrasonic sensor is larger than a reference signal. This has the effect of eliminating the galling of doggle pins. As a result, work can be stopped when galling occurs, and it is no longer necessary to take a long time to recover, unlike in the past.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram showing an embodiment of a tosoggle injection molding machine according to the present invention, Fig. 2 is an assembly drawing showing the installation position of the ultrasonic sensor in detail, and Figs. 3 and 4 are the same as Fig. 1. FIG. 5 is a block diagram showing a conventional toggle type injection molding machine, and FIG. 6 is an assembly diagram showing details of the toggle pin in the conventional device. ■...Machine base, 2...Fixed platen, 3...
・End platen, 4... Tie bar, 5... Moving platen, 6.7... Mold, 8... Tongle device, 9.
...Cylinder device, 10...First link group, 11...
・Second link group, 12... Tongeru link installation part,
13...Tongle pin, 14...Tongle link,
15.16...Keyway, 17...Screw, 18...
Plate, 19...Protrusion, 20...Ultrasonic sensor,
21...Amplifier, 22...Comparator, 23...Pulse generator, 24...Pulse counter, 5...Pulse width comparator.

Claims (1)

[Claims] A toggle injection molding machine equipped with an ultrasonic sensor that detects elastic waves generated when a toggle pin is bitten, and a comparator that outputs a signal when the detection signal of the ultrasonic sensor is larger than a reference signal.