JPH07232811A - Sealing device for bucket chain - Google Patents

Abstract

PURPOSE:To prevent the damage of a closed seal part by dust, etc., entry of foreign matter into the seal part, and lubricating oil leakage from the seal part by providing a cover ring into the closed seal part between outer and inner link plates. CONSTITUTION:The end of the outer link plate 4 of a bucket chain is installed rotatably on a connecting shaft 6, a shield bush 10 is fitted closely around the connecting shaft 6, and the end of an inside link plate 5 is installed rotatably on the shield bush 10. Also a lubricating oil reserving hole 20 through the axis of the connecting shaft 6 is communicated between the connecting shaft 6 and the shield bush 10 through an oil hole 21, and the shaft end opening part of the lubricating oil reserving hole 20 is closed with a closing end plug 23. Then a thrust ring 24 and a closing seal part 26 are provided between the inner surface of an outside link plate and the end surface part of the shield bush 10, and also a cover ring 25 is installed on the inner surface of the outer ring plate 4 so that it is brought in contact with a rubber ring seal 28.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bucket chain sealing device used in a continuous excavator, an unloader or the like.

[0002]

2. Description of the Related Art A bucket chain used in a conventional unloader will be described with reference to FIG. The unloader has a continuous vertical carrier 1 attached to the tip of the boom on the traveling machine body. The continuous vertical carrier 1 usually has a bucket chain line that can circulate in the vertical direction (see arrow 2).

3 and 4 is a bucket chain of a bucket chain line which can be circulated in the vertical direction. The bucket chain 3 has outer links 4 and inner links 5 alternately connected by a connecting shaft 6. Endlessly connected, a roller 7 is fitted on the connecting shaft 6 between the links 4 and 5, and the roller 7 engages with the sprockets 8a and 8b in FIG. 1 to move in the vertical direction (see arrow 2). The bucket 9 is supported by the pair of left and right bucket chains 3 and 3 facing each other at regular intervals.

FIG. 5 shows details of the connecting shaft 6 portion. 10 is a shield bush fitted around the connecting shaft 6, 11 is a grease hole provided in the shaft core portion of the shield bush 10, 12 is a grease nipple for sealing the shaft end opening of the grease hole 11, and the grease hole 11 is The connecting shaft 6 and the shield bush 10 are connected through an oil hole 11 'provided in the connecting shaft 6.
I have been in contact with. Numerals 14 and 15 are double ring seals interposed between the outer link 4 and the inner link 5 around the shield bush 10.

Generally, in the bucket chain 3 of a large machine, the connecting shaft 6 has a length of 300 to 400 mm and a diameter of 60 to
Since the size is as large as 70 mm, the lubrication method having the above configuration is used.

[0006]

In the continuous circulating bucket chain 3 used in the conventional unloader shown in FIGS. 3 to 5, the bucket chain 3 itself together with the bucket 9 repeatedly and directly with bulk goods such as coal and ore. Because of the contact, the seals 14 and 15 are liable to be damaged by dust or the like, foreign matter is mixed, and grease leaks easily. Frequent inspections, grease injection and repairs are required at regular operating hours. There is a problem in that the grease holes are blocked by the mixing, making it impossible to supply grease.

The present invention has been proposed in view of the above problems, and its object is to prevent the damage of the hermetically sealed portion due to dust or the like, the inclusion of foreign matter, and the leakage of lubricating oil at regular intervals of operation time. The present invention intends to provide a bucket chain seal device that can prevent frequent lubrication, lubrication oil injection, and repairs, as well as prevent clogging of oil holes due to dust and foreign matter, and prevent unlubrication. In point.

[0008]

In order to achieve the above object, the present invention relates to a bucket chain used for an unloader or the like, in which an end portion of an outer link plate of the bucket chain is rotatably attached to a connecting shaft. A shield bush is fitted around the connecting shaft, the end portion of the inner link plate of the bucket chain is rotatably attached to the shield bush, and a lubricating oil reservoir hole and an oil hole are provided in the shaft core portion of the connecting shaft. The lubricating oil reservoir hole is connected between the connecting shaft and the shield bush via the same oil hole, and the shaft end opening of the lubricating oil reservoir hole is sealed with a sealing end plug, A hermetically sealed portion and a cover ring are interposed between the inner surface of the outer link plate and the outer surface of the inner link link plate.

In the above bucket chain, a thrust ring and a hermetic seal portion contacting the thrust ring are interposed between the inner surface of the outer link plate around the connecting shaft and the end surface of the shield bush, and the outer link plate is provided. A cover ring that comes into contact with the rubber seal ring of the hermetic seal portion may be interposed between the inner surface of and the outer surface of the inner link plate.

[0010]

The bucket chain sealing device of the present invention is constructed as described above, and the hermetically sealed end plug is removed to allow the lubricating oil to flow from the shaft end opening of the lubricating oil sump to the connecting shaft via the lubricating oil sump → oil hole. After injecting between the shield bush,
Seal the shaft end opening of the lubricating oil sump with a sealing end plug. In this state, one end side of the lubricating oil system is sealed by the sealed end plug, and the other end side is sealed by contact with the hermetically sealed portion (rubber seal ring) of the cover ring, so that the lubricating oil system is completely exposed to the outside. Be cut off. Therefore, damage to the hermetically sealed part due to dust, contamination of foreign matter,
Lubricant leakage does not occur, frequent inspection at regular operating hours,
It is not necessary to inject and repair lubricating oil, and the oil holes are not blocked due to the mixing of dust or foreign matter, which makes it impossible to lubricate, and the mobility of the bucket chain is significantly improved.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a bucket chain sealing device of the present invention will be described with reference to an embodiment shown in FIGS. The same reference numerals are used for the same parts as those in the conventional art among the parts in the drawing. Reference numerals 4 and 4 denote outer link plates of the bucket chain. The end portions of the outer link plates 4 are rotatably attached to the connecting shaft 6, and the shield bush 1 is provided around the connecting shaft 6.
No. 0 is fitted, the ends of the inner link plates 5 and 5 of the bucket chain are rotatably attached to the shield bush 10, and the lubricating oil sump hole 20 and the oil hole 21 are provided in the shaft core of the connecting shaft 6. The lubricating oil sump hole 20 is connected between the connecting shaft 6 and the shield bush 20 through the same oil hole 21, and the shaft end opening of the lubricating oil sump hole 20 is sealed by a sealing end plug 23 to form a connecting shaft. 6 between the inner surface of each outer link plate 4 and the end surface of the shield bush 10 and a sealing ring 24 (sealing seal including a wear-resistant rubber double lip seal 27 and a rubber ring seal 28). Part)
26, and the cover ring 25 is attached to the inner surface of the outer link plate 4 so as to contact the rubber ring seal 28. A roller 7 is fitted on the shield bush 10.

The thrust ring 24 is loosely interposed between the inner surface of the outer link plate 4 and the end surface of the shield bush 10. In addition, the above-mentioned lubricating oil reservoir hole 20
Has an end stopper fixed in its shaft end opening, and the closed end plug 23 is screwed into a screw hole provided in the end stopper 22. 29 is lubricating oil, and the lubricating oil 29 uses the closed end plug 23 for the end stopper 22.
And the lubricating oil sump hole 20, the oil hole 21, and the connecting shaft 6
And the lubricating oil filled between the shield bush 10 and the shield bush 10.

In the bucket chain sealing device shown in FIGS. 1 and 2, the connecting shaft 6 is connected to the outer link plate 4.
And when removed from the inner link plate 5, each outer link plate 4 and the thrust ring 24 hold the thrust ring 24 and the hermetic seal portion 26, and each inner link plate 5 holds the shield bush 10 and the roller 7. become. In this state, the outer link plates 4 and the cover ring 4 are separated from the inner link plates 5, and the thrust ring 24 and the hermetic seal portion 26 are replaced with new ones. Assemble the bucket chain seal device according to the procedure, remove the closed end plug 23, and transfer the lubricating oil from the shaft end opening of the lubricating oil sump 20 to the lubricating oil sump 20 → oil hole 21.
After injection through the space between the connecting shaft 6 and the shield bush 10, the shaft end opening of the lubricating oil sump 20 is closed.
Seal with 3. In this state, one end side of the lubricating oil system is hermetically sealed by the hermetically sealed end plug 23, and the other end side is hermetically sealed by contact with the hermetically sealing portion 26 (com seal ring 28) of the cover ring 5, so that the lubricating oil system is external. Completely shut off against. Therefore, the hermetically sealed portion 26
No damage due to dust etc., contamination by foreign matter, leakage of lubricating oil does not occur, frequent inspection every fixed operating time, lubrication oil injection, repair are unnecessary, and oil hole 21 is formed by contamination of dust and foreign matter. The bucket chain is not blocked, and the greasing is not impossible, and the bucket chain movability is significantly improved.

[0014]

As described above, in the bucket chain seal device of the present invention, the closed end plug is removed, and the lubricating oil is fed from the shaft end opening of the lubricating oil reservoir to the lubricating oil reservoir → oil hole through the connecting shaft and the shield bush. After pouring into the space, the shaft end opening of the lubricating oil sump is closed with a closed end plug. In this state, one end side of the lubricating oil system is sealed by the sealed end plug, and the other end side is sealed by contact with the hermetically sealed portion (rubber seal ring) of the cover ring, so that the lubricating oil system is completely exposed to the outside. Since it is shut off, it does not cause damage due to dust etc. of the hermetic seal part, contamination of foreign matter, leakage of lubricating oil, frequent inspection at regular operating hours, lubrication oil injection, repair is unnecessary, and dust and It is possible to prevent the oil hole from being blocked due to the entry of foreign matter, prevent the impossibility of greasing, and significantly improve the movability of the bucket chain.

[Brief description of drawings]

FIG. 1 is a cross-sectional plan view showing an embodiment of a bucket chain sealing device according to the present invention.

FIG. 2 is an enlarged cross-sectional plan view showing a hermetically sealing portion of the sealing device.

FIG. 3 is a side view of a bucket chain used in a conventional unloader.

FIG. 4 is an enlarged plan view of the bucket chain.

FIG. 5 is an enlarged cross-sectional plan view showing a hermetically sealed portion of the bucket chain.

[Explanation of symbols]

 4 Outer link plate 5 Inner link plate 6 Connecting shaft 7 Roller 10 Shield bush 20 Lubricating oil sump 21 Oil hole 22 End stopper 23 Sealed end plug 24 Thrust ring 25 Cover ring 26 Sealed seal part 27 Double lip seal 28 Rubber ring seal 29 Lubrication oil

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobuto Iwamoto 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Mitsubishi Heavy Industries Hiroshima Works

Claims (2)

[Claims] 1. In a bucket chain used for an unloader or the like, an end portion of an outer link plate of the bucket chain is rotatably attached to a connecting shaft, a shield bush is fitted around the connecting shaft, and the inside of the bucket chain is The end portion of the link plate is rotatably attached to the shield bush, a lubricating oil reservoir hole and an oil hole are provided in the shaft core portion of the connecting shaft, and the lubricating oil reservoir hole is inserted through the oil hole to form the connecting shaft. And the shield bush, the shaft end opening of the lubricating oil reservoir hole is sealed by a sealing end plug, and the inner surface of the outer link plate around the connecting shaft and the outer surface of the inner link link plate. A sealing device for a bucket chain, wherein a hermetically sealing part and a cover ring are interposed between the two. 2. In the bucket chain, a thrust ring and a hermetic seal portion contacting the thrust ring are provided between the inner surface of the outer link plate around the connecting shaft and the end surface of the shield bush, and 2. The bucket chain sealing device according to claim 1, further comprising a cover ring interposed between the inner surface of the link plate and the outer surface of the inner link plate, the cover ring being in contact with the rubber seal ring of the hermetic seal portion.