JP2000141436A - Lubrication device for toggle link mechanism of injection molding machine or the like and lubrication method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate shortcomings such as the breaking-off of a lubricant supply, the easy deterioration of a lubricant due to foreign materials such as dust caught between a link pin and a bush from the outside, moisture inclusion or contact with air or the further promotion of wear in addition to the deterioration of a die clamping force and moderate the wear of the link pin and the bush. SOLUTION: In a lubrication device for the toggle link mechanism, of an injection molding machine or the like, to which a plurality of toggle links 20, 23 are connected, in a freely rotating manner, with a toggle pin 21 through a bush 22, seal grooves 24 formed on both end parts of the inside diametral face of the bush 22 or either of the sides of the outer peripheral face of the pin 21 opposite to both end parts of the inside diametral face of the bush 22 and a seal material 25 fitted into the seal grooves 24, are provided to serve as a seal structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a lubricating device and a lubricating method for a toggle link mechanism of an injection molding machine, a die casting machine or the like.

[0002]

2. Description of the Related Art Conventionally, as one form of an injection molding machine or a die casting machine (hereinafter simply referred to as an injection molding machine), a toggle type injection molding machine using a toggle mechanism as a mold clamping device has been known.

A mold clamping device of a toggle injection molding machine will be described with reference to FIGS. 6 and 7. The mold clamping device 1 moves with respect to a fixed platen 4 on which a fixed mold 3 fixed to a molding machine main body frame 2 is mounted. The moving plate 6 to which the mold 5 is attached is a tie bar 7
The link housing 8 is disposed via a tie bar 7 so as to face the anti-mold mounting surface A of the moving plate 6, and a toggle mechanism 9 is provided between the moving plate 6 and the link housing 8. The cross head 11 in the toggle mechanism 9 is advanced and retracted by the hydraulic cylinder 10 fixed to the link housing 8, and the moving platen 6 moves from the mold opening position shown in FIG. 6 to the mold closing position shown in FIG. It is supposed to.

That is, in order for the mold clamping device 1 to change from the mold open state to the mold closed state, the hydraulic cylinder 10 moves the crosshead 11 forward (rightward in the drawing) from the position 11a indicated by the dashed line. As a result of the toggle link 12 pushing the toggle link 13 rightward in the figure as shown in FIG. 7 from the state of FIG. 6, the movable platen 6 moves forward, bringing the two molds 3 and 5 into contact with each other. The toggle link 12 extends to the right and expands the gap L between the link housing 8 and the fixed board 4 as a result. As a result, the tie bar 7 provided between the link housing 8 and the fixed board 4 is stretched, and the tie-bars 7 An elastic recovery force is generated as a force, and the elastic recovery force is used as a mold clamping force to firmly tighten the two dies 3 and 5.

[0005]

As a result, the mold clamping force is imposed not only on the tie bar but also on each link and on the link pin and its bush which are rotatably connecting each link. The wear of the bush has the disadvantage that the balance of the toggle mechanism is lost, the tie bar cannot be evenly extended, and the mold clamping force becomes uneven, so that a high-precision molded product cannot be obtained. As shown in FIGS. 8 and 9, in the related art, the wear of the link pin 14 and the bush 15 is only occasional injection of lubricating oil such as grease from the lubricating oil supply port 16 at the end of the toggle links 12 and 13. As a result, the lubricating oil is interrupted by a long-time operation, foreign matter such as dust enters between the link pin 13 and the bush 14 from outside, and furthermore, mixing of the lubricating oil with water or contact with air deteriorates the lubricating oil. As a result, wear was further promoted in addition to the mold clamping force.

An object of the present invention is to provide a seal structure between a link pin and a bush so that the above-mentioned lubricating oil is interrupted or that foreign matter such as dust or lubricating oil is mixed between the link pin and the bush from the outside due to mixing of moisture and air. It is an object of the present invention to provide a lubricating device and a lubricating method for a toggle link mechanism such as an injection molding machine for reducing the wear of a link pin and a bush while eliminating the disadvantage that the contact pin is easily deteriorated and the wear is accelerated.

[0007]

According to the present invention, there is provided a lubricating device for a toggle link mechanism, such as an injection molding machine, in which a plurality of toggle links are rotatably connected by toggle pins via bushes. A seal groove provided on either end of the inner diameter surface of the bush or on an outer peripheral surface of a pin opposed to both end portions of the inner diameter surface of the bush; and a seal material fitted in the seal groove. A lubricating device for a toggle link mechanism such as an injection molding machine characterized by having a seal structure.

In a lubrication method for a toggle link mechanism of an injection molding machine or the like in which a plurality of toggle links are rotatably connected by link pins via bushes, injection is performed through an oil supply pipe from a pump outside the toggle link. After introducing the lubricating oil between the inner peripheral surface of the bush surrounded by the sealing material and the outer peripheral surface of the link pin, an oil reservoir provided between an adjacent member that covers the end surface of the bush and another adjacent toggle link. And a guide from the oil reservoir to a recovery device via a discharge pipe outside the link via an adjacent member, thereby providing a lubrication method for a toggle link mechanism of an injection molding machine or the like.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Toggle links 20 and 23
Are rotatably connected via a link pin 21 and a bush 22, respectively. As shown in FIG. 2, at both ends of the inner diameter surface of the bush 22, a seal groove 24 and a seal fitted in the groove 24 are provided. A material 25 is provided so that lubricating oil such as grease supplied between the bush 22 and the link pin 21 from the oil supply port 26 does not flow out from between the bush 22 and the link pin 21, and the gap between the outside and the outside is prevented. Foreign substances such as water and dust are prevented from entering inside.

Here, in the above-described embodiment, an example in which the seal groove 24 is provided on the bush 22 side has been described. On the contrary, a seal groove 27 is provided on the link pin 28 side as shown in FIG. The effect is the same even if the sealing material 29 is fitted in the inside 27.

Next, another embodiment of the present invention will be described with reference to FIGS. In this embodiment, the lubricating oil is not interrupted during operation, and is prevented from flowing out between the bush and the link pin, and foreign matter such as water and dust is prevented from entering the space from outside. It is a lubrication method.

Lubricating oil such as grease is provided by the toggle link mechanism 3
From the pump 32 housed in the lower frame 31 of the cylinder 0, the oil is introduced from the oil supply port 38 to the link pin 37 which rotatably connects the toggle links 34 and 35 via the bush 36 via the oil supply pipe 33. The lubricating oil introduced from the oil supply port 38 passes between the bush 36 and the link pin 37 as shown by the arrow, and the toggle link 35 adjacent to the end face of the bush 36.
It is guided to an oil reservoir 39 provided therebetween, and returns from the oil reservoir 39 through a discharge port 40 and a discharge pipe 41 to a collection bottle 42 which is a collection device housed in the frame 31.

The lubricating oil introduced between the bush 36 and the link pin 37 and between the end face of the bush 36 and the adjacent member is used for the seal groove 43, the seal member 44 and the seal groove 45 fitted in the seal groove 43. The seal is sealed by a seal member 46 inserted into the seal groove 45, so that lubricating oil does not leak from the inside, and water, air, dust and the like from the outside do not enter.

In the above-described embodiment, an example in which the end face of the bush and the toggle link are adjacent to each other is described. However, the present invention is not limited to this. Is also good.

[0015]

As described above, in the present invention, the lubricating oil is cut off or foreign matter such as dust enters between the link pin and the bush from the outside. A lubricating device and a lubricating method for a toggle link mechanism such as an injection molding machine for reducing the abrasion of the link pin and the bush by removing the disadvantage that the contact pin is easily deteriorated by the contact and accelerates abrasion.

[Brief description of the drawings]

FIG. 1 is a diagram showing a lubricating device of a toggle link mechanism of an injection molding machine or the like showing an embodiment of the present invention.

FIG. 2 is a diagram of a lubricating device for a toggle link mechanism of an injection molding machine or the like showing an embodiment of the present invention, and is a cross-sectional view taken along the line DD of FIG. 1;

3 is a diagram of a lubricating device of a toggle link mechanism of an injection molding machine or the like showing an embodiment of the present invention, and is a diagram showing another embodiment of a cross section taken along line DD of FIG. 1;

FIG. 4 is an explanatory diagram of a lubrication method for a toggle link mechanism of an injection molding machine or the like according to an embodiment of the present invention.

5 is an explanatory view of a lubrication method for a toggle link mechanism of an injection molding machine or the like showing an embodiment of the present invention, and is a cross-sectional view taken along line EE of FIG. 4;

FIG. 6 is an explanatory view of a mold clamping device of a conventional toggle-type injection molding machine, showing a mold open state.

FIG. 7 is an explanatory view of a mold clamping device of a conventional toggle-type injection molding machine, showing a mold closed state.

FIG. 8 is an explanatory view of a mold clamping device of a conventional toggle-type injection molding machine, and is a detailed view of a part 'a' of FIG. 7;

FIG. 9 is an explanatory diagram of a mold clamping device of a conventional toggle-type injection molding machine, and is a cross-sectional view taken along the line CC of FIG.

[Explanation of symbols]

 20, 23, 34, 35 Toggle link 21, 29, 37 Link pin 22, 36 Bush 24, 27, 43, 45 Seal groove 25, 28, 44, 46 Seal member 26, 38 Oil filler 30 Toggle link mechanism 31 Frame 32 Pump 33 oil supply pipe 39 oil sump 40 discharge port 41 discharge pipe 42 collection bottle

Claims (3)

[Claims] 1. A lubricating device for a toggle link mechanism, such as an injection molding machine, in which a plurality of toggle links are rotatably connected by link pins via a bush, both ends of the bush inner diameter surface, or the bush inner diameter. An injection molding machine or the like having a seal structure including a seal groove provided on any one side of an outer peripheral surface of a link pin opposed to both ends of the surface, and a seal material fitted in the seal groove. Lubrication device for toggle link mechanism. 2. A lubrication method for a toggle link mechanism such as an injection molding machine in which a plurality of toggle links are rotatably connected by link pins via bushes. After guiding the lubricating oil between the inner peripheral surface of the bush surrounded by the sealing material and the outer peripheral surface of the link pin, the lubricating oil is guided to an oil reservoir provided between the bush end surface and an adjacent member covering the same end surface, and from the oil reservoir. A method of lubricating a toggle link mechanism of an injection molding machine or the like, wherein the lubrication is led out of a link via a discharge pipe to an outside of a link via an adjacent member. 3. The lubrication method for a toggle link mechanism of an injection molding machine or the like according to claim 2, wherein said adjacent member is another adjacent toggle link.