JP2002361707A - Automatic lubrication method for electric injection molding machine - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To supply lubricating oil to an injection mechanism and a mold-clamping mechanism with lubrication required with a single pump, to reduce equipment cost and to facilitate maintenance. . An electromagnetic switching valve (2) is interposed between an injection mechanism-side greasing path (11) and a mold clamping mechanism-side greasing path (51), and a discharge pipe (1a) of one pump (1). By controlling the electromagnetic switching valve 2 by the control unit 3, lubricating oil is periodically replenished at different cycles to the injection mechanism-side greasing required section 10 and the mold clamping mechanism-side greasing required section 50. For example, every time the injection counter 5 counts 1000 shots,
The solenoid a is excited to switch to the position A, and the pump 1 is started to supply oil to the injection mechanism-side greasing required portion 10, while the solenoid b is excited every time the mold clamping counter 6 counts 2,000 shots. Then, the pump 1 is switched to the position B and the pump 1 is started to supply the lubricant to the mold clamping mechanism-side greasing required portion 50.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic injection molding machine for an electric injection molding machine which periodically replenishes lubricating oil to a portion to be supplied with lubricating oil in a mold clamping mechanism and an injection mechanism of the electric injection molding machine. It relates to a lubrication method.

[0002]

2. Description of the Related Art A toggle type opening / closing mechanism 2 as shown in FIG.
For electric injection molding machine equipped with a 01, the mold clamping mechanism E _2, in addition to the mold opening and closing ball screw nut 227 and the ejector ball screw nut 228, the mold thickness adjusting nut 22
Numerous greasing to be part of such 9 and Togurubushu 230 (hereinafter, referred to as. "Main greasing unit") is present, while in the injection mechanism portion E _1, the injection ball screw nut (not shown) and injection unit back and forth In addition to the ball screw and nut for advancement, there are also parts to be greased (hereinafter referred to as “grease required”) such as a linear guide and an intermediate plate that support the injection unit. Lubricating oil must be replenished.

In particular, during high cycle molding, the injection
Discharge mechanism E₁Of the mold clamping mechanism E _TwoSignificantly higher than
Supply of lubricating oil to the greasing required part 100 on the injection mechanism side.
The grease interval is set to about 1/2 of the grease required part 200 of the mold clamping mechanism.
There is a need to.

A conventional automatic lubrication method for an electric injection molding machine employs an injection mechanism side pump 120 as shown in FIG.
And two pumps, a mold-clamping mechanism-side pump 220, and the injection mechanism-side pump 120 is activated every time the injection counter 301 attached to the controller 300 counts a predetermined number of shots (for example, 1000 shots). To periodically lubricate the injection mechanism side lubrication unit 100 with lubricating oil.
Mold clamping counter 302 attached to controller 300
Is configured to start the mold-clamping mechanism-side pump 220 and periodically supply lubricating oil to the mold-clamping-mechanism-required greasing unit 200 every time a predetermined number of shots (for example, 2000 shots) are counted. I have.

[0005] Incidentally, the injection mechanism-side greasing required portion 100 includes a first distribution valve 121 and a second distribution valve 122 connected to a discharge side of the injection mechanism-side pump 120 via a pipe 130,
Injection unit forward / backward moving ball screw / nut 123 and linear guide 124 connected to first distribution valve 121 via hose 131 and the like, and hose 13 for second distribution valve 122
Injection ball screw / nut 12 connected via 1 or the like
5 and an intermediate plate 126.

On the other hand, the mold-clamping mechanism-side greasing-requiring section 200 is connected to a discharge side of the mold-clamping-mechanism-side pump 220 via a pipe 230, and includes a third distribution valve 221, a fourth distribution valve 222, and a fifth distribution valve. There are a valve 223, a sixth distribution valve 224, a seventh distribution valve 225, an eighth distribution valve 226, and each part of a mold clamping mechanism connected to the third distribution valve 221 to the eighth distribution valve 226 via a hose 231 or the like. . For example, a ball screw / nut 227 for opening and closing the mold is connected to the sixth distribution valve 224 via a hose 231 or the like.
Are connected to the seventh distribution valve 225.
An ejector ball screw / nut 228 and the like connected via the first and the like are connected.

[0007]

The above prior art uses two pumps, the injection mechanism side pump and the mold clamping mechanism side pump, so that the cost is increased and the two pumps are individually provided. There is a problem that the maintenance is complicated because it is necessary to replenish the lubricating oil.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and a single pump can supply lubricating oil to an injection mechanism section and a greasing required section of a mold clamping mechanism section. It is an object of the present invention to realize an automatic lubrication method for an electric injection molding machine which can be performed at a low cost and can be easily maintained.

[0009]

In order to achieve the above object, an automatic lubrication method for an electric injection molding machine according to the present invention is provided. An injection mechanism-side greasing path for lubricating the injection mechanism-side greasing-required portion and a mold-clamping mechanism for greasing the mold-clamping mechanism-side greasing-required portion. Between the side greasing path and the discharge path of one pump, the discharge path, the injection mechanism-side greasing path and the mold clamping mechanism-side greasing path are selectively connected and shut off. Flow path switching means capable of switching the flow path, and selectively connects the injection mechanism-side greasing path and the mold clamping mechanism-side greasing path with the discharge path of the pump at a different cycle. Switching the flow path by the flow path switching means and activating the pump, the injection mechanism In different periods in the mold clamping mechanism side main greasing section and main greasing unit is characterized in that supply regular lubricant.

[0010]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a flowchart showing an embodiment. In the present embodiment, an electric injection molding machine (not shown) is similar to the above-described conventional electric injection molding machine. And a side greasing unit 50.

A first distribution valve 13 and a second distribution valve 14, which are connected to one end of an injection mechanism-side greasing passage 11 through a pipe 12, are described below.
Injection unit forward / backward movement ball screw / nut 16 and linear guide 17 connected to first distribution valve 13 via hose 15 and the like, and injection ball screw / nut connected to second distribution valve 14 via hose 15 and the like. 18 and an intermediate plate 19 and the like.

[0013] The mold-clamping mechanism-side greasing-requiring section 50 includes third to eighth distribution valves 53 to 58 connected to one end of a mold-clamping mechanism-side greasing passage 51 to be described later via a pipe 52. , 3rd to 8th
There are various parts to be supplied with lubricating oil connected to the distribution valves 53 to 58 via hoses 59 and the like. For example, a ball screw / nut 60 for opening and closing the mold is connected to the sixth distribution valve 56 via a hose 59 and the like.
7 is connected to a ball screw / nut 61 for an ejector via a hose 59 and the like.

It goes without saying that the number of distribution valves and the number of greasing parts connected to each distribution valve via a hose or the like can be increased or decreased according to the type of electric injection molding machine.

In the present embodiment, the other end of the injection mechanism-side greasing passage 11 and the other end of the mold clamping mechanism-side greasing passage 51,
Between the discharge path 1a of one pump 1, the discharge path 1a, the injection mechanism-side greasing path 11 and the mold clamping mechanism-side greasing path 51 are selectively connected and the flow paths are switched so as to be shut off. An electromagnetic switching valve 2 is interposed between the pump 1 and the electromagnetic switching valve 2. The control unit 3 controls the pump 1 and the electromagnetic switching valve 2 as follows.

An injection counter 5 attached to the controller 4 sets a predetermined number of molding shots (for example, 100 shots).
Every time (0 shot) is counted, a signal is output from the first output section 7 for a time necessary for replenishing the lubricating oil, and the solenoid a of the electromagnetic switching valve 2 is excited to switch from the neutral position T to the A position to switch the pump. 1 discharge path 1a to the injection mechanism side greasing path 1
1 and start the pump 1 to replenish the required amount of lubricating oil, and after the replenishment is completed, the electromagnetic switching valve 2 returns to the neutral position.

On the other hand, the mold clamping counter 6 attached to the controller 4 sets a predetermined number of molding shots (for example,
2000 output), the second output unit 8
A signal is output only for a time necessary for replenishing the lubricating oil, and the solenoid b of the electromagnetic switching valve 2 is excited so that B is shifted from the neutral position T to B
By switching to the position, the discharge path 1a of the pump 1 is connected to the greasing path 51 on the mold-clamping mechanism side and the pump 1 is started to supply a necessary amount of lubricating oil. Return to position.

It should be noted that the injection counter 5 and the mold clamping counter 6 coincide with each other at the completion of counting the number of molding shots.
In some cases, both output signals may overlap. In this case,
The output signal of the injection counter 5 is prioritized over the output signal of the mold clamping counter 6, and after the greasing is performed to the injection mechanism-side greasing path 11, the greasing is performed to the mold clamping mechanism-side greasing path 51. It is good to do.

In the present invention, the flow path switching means includes the electromagnetic switching valve 2 shown in the above-mentioned embodiment, the discharge path 1a of the pump 1, the injection mechanism side greasing path 11 and the mold clamping mechanism side greasing path 51. For example, an opening / closing valve which is always closed with respect to the injection mechanism-side greasing path and the mold clamping mechanism-side greasing path branched from the discharge path 1a of the pump 1 is not limited thereto. It can be configured such that both on-off valves are opened at different periods.

[0020]

Since the present invention is configured as described above, it has the following effects.

Since only one lubricating oil supply pump is required,
The equipment cost can be reduced, and the labor required for maintenance such as replenishment of lubricating oil to the pump can be reduced.

[Brief description of the drawings]

FIG. 1 is a flowchart showing one embodiment of an automatic lubrication method for an electric injection molding machine according to the present invention.

FIG. 2 is an explanatory view showing a conventional electric injection molding machine with a part omitted.

FIG. 3 is a flowchart showing an automatic lubrication method in the electric injection molding machine shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pump 2 Solenoid switching valve 3 Control part 4 Controller 5 Injection counter 6 Mold clamping counter 7 1st output part 8 2nd output part 10 Injection mechanism side greasing required part 11 Injection mechanism side greasing path 12 Pipe 13 First Distributing valve 14 Second distributing valve 15, 59 Hose 16 Injection unit forward / backward movement ball screw / nut 17 Linear guide 18 Injection ball screw / nut 50 Mold clamping mechanism-side greasing required part 51 Mold clamping mechanism-side greasing passage 53-58 3rd to 8th distribution valves 60 Ball screw / nut for opening / closing 61 Ball screw / nut for ejector

Claims (1)

[Claims] 1. An electric injection molding machine having an injection mechanism-side greasing required section (10) and a mold-clamping mechanism-side greasing required section (50) for supplying lubricating oil at different cycles, wherein the injection mechanism side An injection mechanism-side greasing path (11) for lubricating the greasing-requiring section, a mold-clamping- mechanism-side greasing path (51) for greasing the mold-clamping-section-greasing section, and one pump (1) Between the discharge path (1a) and the discharge path, the injection mechanism-side greasing path and the mold clamping mechanism-side greasing path, and the flow path can be switched so as to be cut off. The flow passage switching means (2) is interposed to selectively connect the injection mechanism-side greasing passage and the mold clamping mechanism-side greasing passage to the pump discharge passage at different periods. The flow path is switched by means and the pump is started, and the greasing required on the injection mechanism side and the mold clamping mechanism side Automatic greasing process of electric injection molding machine, characterized in that replenishing periodically lubricating oil at different periods greasing section.