JPH0227960Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is an automatic lubrication method for plunger tips of die-casting machines that automatically supplies lubricant to the oil supply section of the plunger tips by electrically interlocking with the die-casting machine. It is related to the device.

[Conventional technology]

In the die casting method, molten metal is poured into the injection sleeve of a cold chamber (cold pressure) type die casting machine, and the molten metal is pressed into the mold with a plunger tip to form the product.
To prevent galling between the injection sleeve and the plunger tip, lubricant is normally dripped into the plunger tip after each injection cycle, and an automatic lubrication device that is electrically linked to the die-casting machine is used as a means for this purpose. is used.

[The problem that the idea attempts to solve]

However, if lubricant is not properly supplied to the lubrication system due to clogging of the oil line, failure of the lubrication pump or equipment, etc., the mechanical performance (injection function) of the die-casting machine will be impaired, and expensive This will damage the injection sleeve, plunger tip, etc., but since conventional automatic lubrication devices do not have a means to check whether lubricant is being supplied properly, it is necessary to prevent such troubles. was impossible.

[Means to solve the problem]

In order to solve the above-mentioned problem, this invention supplies lubricant O to the plunger tip 4 by pump operation.
A discharge detector 20 for detecting whether lubricant O is normally discharged from the lubricant pump 13 is installed in the middle of the oil supply pipe 14 that sends the oil to the oil supply section 4a, and a limit switch 21 of this discharge detector 20 is installed.
An electric circuit El is connected to the discharge detector 20, which issues an electrical abnormality signal when the discharge detector 20 detects an abnormal discharge state of the lubricant O, and takes measures such as an alarm or an emergency stop of the machine.

[Effect]

The lubricating device 10 supplies lubricant O to the plunger tip 4 by using a lubricating pump 13 that automatically operates in conjunction with the die-casting machine 1. The discharge detector 20 operates to electrically detect whether or not the lubricant O is being normally discharged from the lubricant pump 13. When the discharge detector 20 detects an abnormal discharge state of the lubricant O (a state in which the lubricant O is not normally supplied due to clogging of the oil line 17a, failure of the lubrication pump 13 or equipment, etc.), An electrical abnormality signal is generated by the electric circuit El connected to the limit switch 21 of the discharge detector 20, and measures such as an alarm or an emergency stop of the machine are taken.

〔Example〕

Embodiments of this invention will be described below with reference to the drawings. Fig. 1 is a front view showing the automatic lubricating device of the present invention in relation to a die-casting machine, and Fig. 2 is an air system diagram of this lubricating device. This is a cold chamber (cold press) type die casting machine that pours molten metal (molten metal) from the machine and presses the molten metal into the cavities of molds 5 and 6 using a plunger tip 4 to form a product.

10 is for preventing galling between the injection sleeve 2 and the plunger tip 4 of the die-casting machine 1,
An automatic lubrication device is shown that electrically interlocks with the die-casting machine 1 and drips lubricant O into the plunger tip 4 for each cycle of injection operation. At the same time, the solenoid valve 15 is energized to introduce the primary air sent from the air inlet 11 through the lube unit 12 to the A side of the double-acting lubrication pump 13. By moving the pump piston 13a forward, the lubricant O sucked into the pump 13 is discharged (pushed out) into the oil pipe 14.
It is configured to be supplied dropwise to the oil supply section 4a of the plunger tip 4.

In addition, the reference numeral 16 shown in FIGS. 1 and 2 is a lubricant storage container, 17 is a suction pipe that sucks up the lubricant O in the container 16, and 17a is a connection between the suction pipe 17 and the pump suction port 13b. oil line,
18 is a container holder, and 19 is an apparatus stand.

Therefore, in the automatic lubricating device (conventionally known) having the above-mentioned configuration, this invention provides a lubricant in the middle of the oil supply pipe 14 that sends the lubricant O to the tip oil supply section 4a by pump operation. A discharge detector 20 that detects whether or not lubricant O is being discharged normally from the lubricant pump 13 is incorporated, and an electric signal is activated when the discharge detector 20 detects an abnormality in the discharge of lubricant to the limit switch 21 of this discharge detector 20. An electric circuit El is connected as shown in Fig. 4 to issue an abnormal signal and take measures such as an alarm or an emergency stop of the machine.

The discharge detector 20 has a pipe inlet connection port 23 and a pipe outlet connection port 24 that communicate with the piston chamber 22.
A detector main body 25 having a
a piston valve 27 that opens and closes a port communication portion that is slidably fitted into the piston chamber 22 and is biased by a spring 26 so as to close the communication portion of the inlet side connection port 23 and the outlet side connection port 24; A normally closed limit switch 21 is attached to the main body 25 so that a switch actuator 21a comes into contact with the piston rod end of the piston rod. When moved in the valve opening direction against the elasticity of the spring 26, the switch actuator 21a is pushed up and the limit switch 21 is opened.

The electric circuit El of the detector 20 receives a signal from a limit switch (not shown) for detecting the backward limit of the plunger tip 4 as an input signal (using a timer from the time of mold clamping or mold opening of the die casting machine 1). An external relay EXR that is closed at the same time as the solenoid valve 11 is energized (the lubricant drop supply timing can be measured and used as an input signal);
Relay R that is energized when this external relay EXR is closed, relay contacts r1 and r2 that are closed by energization of this relay R, and energized and energized when these relay contacts r1 and r2 are closed. The count of this timer T is started by energizing the relay R and relay contacts r1 and r2, and the limit switch 21 of the discharge detector 20 is activated within the set time of the timer T. is opened due to the normal discharge and refueling state of lubricant O, the lubricating device 10 is normal.
When the lubricant O is opened, the lubricant O is shut off and the next cycle is started without sending an external abnormality signal. However, if the limit switch 21 of the discharge detector 20 is not opened within the set time of the timer T, that is, the lubricant O When the discharge detector 20 is in the closed state as shown in FIG. 3 due to discharge abnormality and the limit switch 21 is in the closed state, the timer contact t1 is closed due to the expiration of the timer T (exceeding the timer setting time).
is closed, an electrical abnormality signal is sent from the signal line e to an alarm or machine control device (not shown),
It is possible to emit an alarm sound or to make an emergency stop of the die casting machine 1. Incidentally, the reference numeral PB shown in FIG. 4 is a push-type reset lead for restoring the electric circuit El that has generated the above-mentioned abnormal signal to its original state.

[Effect of idea]

The automatic lubrication device for plunger tips of die casting machines of this invention is equipped with the discharge detector 20 and the electric circuit El as described above, so that the lubricant O is properly supplied to the oil supply portion 4a of the plunger tip 4. If the die-casting machine 1 is not refueled, take measures such as issuing an alarm or stopping the machine in an emergency.
It is possible to avoid unforeseen situations such as work in a state where the functions of the injection molding are deteriorated or damage to the expensive injection sleeve or plunger tip.

[Brief explanation of the drawing]

Fig. 1 is a front view showing the automatic lubrication system of the present invention in relation to a die-casting machine, Fig. 2 is an air system diagram of this lubrication system, and Fig. 3 is a discharge detector installed in the middle of the oil pipe. A cross-sectional view of the device, and FIG. 4 is an electrical circuit diagram of this discharge detector. DESCRIPTION OF SYMBOLS 1... Die casting machine, 2... Injection sleeve, 4... Plunger chip, 4a... Chip oil supply part, 5, 6... Mold, 10... Lubricating device, 1
3... Lubricating pump, 14... Oil feed pipe, 15...
...Solenoid valve, 16...Lubricant storage container, O...Lubricant, 17...Lubricant suction pipe, 17a...Oil line, 20...Discharge detector, 21...Discharge detector limit switch, El ...Discharge detector electrical circuit, EXR...External relay, R...Relay,
r1, r2...Relay contact, T...Timer, t
1...Timer contact, e...Signal line that outputs an abnormal signal.

Claims (1)

[Scope of utility model registration request] In an automatic lubricating device for plunger chips of a die-casting machine that is electrically linked with the die-casting machine and automatically supplies lubricant to the oil supply part of the plunger chip, lubricant is sent to the chip oil supply part by pump operation. A discharge detector is installed in the middle of the oil pipe to detect whether or not lubricant is being discharged normally from the lubricant pump. An automatic lubrication device for a plunger tip of a die-casting machine, characterized in that an electric circuit is connected to issue an electrical abnormality signal to take measures such as an alarm or an emergency stop of the machine when an abnormality is detected.