JP2010255673A - Solid lubricating seal chain - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solid lubricating seal chain capable of suppressing slide-contact wear between the outer peripheral surface of a connection pin and the inner peripheral surface of a bush by preventing the leakage of lubricating graphite and the entry of external dust during the operation of the chain, maintaining excellent sealing performance and the life of the seal on a long-term basis without giving surface finishing work to an outer plate, and moreover, suppressing damage to an elastic seal ring, and simply achieving the attachment of the chain. <P>SOLUTION: The solid lubricating seal chain 100 includes an inner plate 110, the bush 120, the connection pin 140, the outer plate 150, the lubricating graphite, and a seal mechanism 160. The seal mechanism 160 is composed of an annular seal receiving member 161, an inner peripheral side seal ring 162, an inner peripheral side elastic seal ring 163, an outer peripheral side seal ring 164, and an outer peripheral side elastic seal ring 165. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a solid lubricated seal chain used for conveyance (conveyor), power transmission (transmission), and the like, and more particularly to a solid lubricated seal used as a bucket conveyor chain used in a continuous unloader for unloading iron ore and coal. Concerning the chain.

  Conventionally, a pair of inner plates each fitted with both ends of a bush and a pair of outer plates each fitted with both ends of a pin rotatably fitted in the bush are alternately connected to each other. There is known a solid lubrication / oil-free chain provided with a sliding member formed of a graphite sheet between pins (for example, see Patent Document 1).

  In such a solid-lubricated oil-free chain, a seal mechanism that prevents external wear of graphite wear powder generated from the graphite sheet provided between the bush and the pin and prevents intrusion of external dust between the bush and the pin As an example, an O-ring disposed between the outer plate and the bush or between the outer plate and the inner plate is employed.

JP2007-170493 (Claims, FIG. 2)

  In the conventional solid-lubricated oil-free chain as described above, a single O-ring disposed between the outer plate and the bushing or between the outer plate and the inner plate can prevent leakage of graphite wear powder and external dust. Therefore, when the O-ring is worn and the sealing performance of the O-ring is deteriorated, there is a problem that both of these functions are simultaneously reduced.

  In addition, the characteristics required of O-rings to prevent foreign particles such as iron ore, coal, and gravel with large particle size and weight, and external dust, and the O-rings to prevent leakage of graphite wear powder with small particle size and weight. However, in the conventional solid lubrication / oil-free chain, an O-ring is provided between the outer plate and the bush or between the outer plate and the inner plate. As a material, it is necessary to adopt a material that has the characteristics required for both the functions of preventing the entry of external dust and the leakage of graphite wear powder, and the function of preventing the entry of external dust and the prevention of leakage of graphite wear powder. There was a problem that it was difficult to improve both functions.

  In addition, the surface that reduces the surface roughness of the outer plate and the bushing or the inner plate to prevent the O-ring from being worn out due to the sliding contact between the outer plate and the bushing or the inner plate to deteriorate the sealing performance. There was a problem that it was necessary to perform finishing processing, and the processing burden of the surface finishing processing increased.

  When excessive sliding wear occurs between the outer plate having a large surface roughness and the bush or the inner plate, the amount of movement of the inner link composed of the bush and the inner plate in the chain width direction increases. Therefore, when the chain is operating, the inner link is shifted in the width direction of the chain and the gap between the inner plate and the outer plate becomes narrow. On the side where the gap is wide, there is a problem that the sealing state is incomplete and the sealing performance is deteriorated.

  Therefore, the present invention solves the conventional problem, that is, the object of the present invention is to prevent leakage of lubricating graphite and intrusion of external dust during chain operation, and to prevent the outer peripheral surface of the connecting pin and the bushing from entering. In addition to suppressing sliding contact with the inner peripheral surface of the outer surface, maintaining the excellent sealing performance and seal life for a long time without applying surface finishing to the outer plate, while also preventing damage to the elastic seal ring The present invention provides a solid lubricated seal chain that suppresses and easily achieves chain assembly.

  The present invention according to claim 1 includes a pair of left and right inner plates that are spaced apart, a pair of front and rear bushes that are press-fitted into the bushing press-fit holes of the inner plate, and a pair of front and rear that are loosely fitted to the bushes Between the pin, a pair of left and right outer plates that form pin press-fit holes for press-fitting the connecting pins and connect the inner plate in the chain longitudinal direction, and between the outer peripheral surface of the connecting pin and the inner peripheral surface of the bush In the solid lubrication seal chain, which is composed of interposed lubricating graphite and a sealing mechanism for preventing external leakage of the lubricating graphite provided between the inner surface of the outer plate and the outer surface of the inner plate, the sealing mechanism Is fitted and fixed to the connecting pin, abuts against the inner surface of the outer plate and partially protrudes from the outer surface of the inner plate and the inner surface of the outer plate. An annular seal receiving member provided with a disc-shaped seal receiving portion interposed between and a rim-shaped seal receiving portion that bulges toward the inner plate on the outer peripheral side of the disc-shaped seal receiving portion, and the annular seal receiving member An inner peripheral side seal ring that is disposed on the inner peripheral side of the rim-shaped seal receiving part and is in sliding contact with the inner side surface of the annular seal receiving member, an inner peripheral surface of the inner peripheral side seal ring, and an outer peripheral surface of the bushing protruding end part An inner peripheral elastic seal ring interposed between the outer peripheral side of the annular seal receiving member, a steel outer peripheral seal ring that is disposed on the outer peripheral side of the annular seal receiving member and slidably contacts the outer surface of the inner plate, and the outer peripheral side The above-described problem is solved by comprising an outer peripheral elastic seal ring interposed between and interposed between the inner peripheral surface of the seal ring and the outer peripheral surface of the annular seal receiving member.

  According to a second aspect of the present invention, in addition to the structure of the first aspect, the outer peripheral surface of the annular seal receiving member is reduced in diameter from the outer plate side toward the inner plate side, and the outer peripheral side seal The inner peripheral surface of the ring is reduced in diameter from the outer plate side toward the inner plate side, thereby solving the aforementioned problems.

  In addition to the configuration of claim 1 or claim 2, the present invention according to claim 3 is such that the outer peripheral surface of the bushing protruding end portion is reduced in diameter from the inner plate side toward the outer plate side, The above-described problem is further solved by reducing the diameter of the inner peripheral surface of the inner peripheral side seal ring from the inner plate side toward the outer plate side.

  According to a fourth aspect of the present invention, in addition to the configuration according to the third aspect, the inclination angle of the outer peripheral surface of the annular seal receiving member and the inner peripheral surface of the outer peripheral seal ring with respect to the chain width direction is such that the bush protruding end By setting the inclination angle of the outer peripheral surface of the portion and the inner peripheral surface of the inner peripheral side seal ring to be smaller than the inclination angle with respect to the chain width direction, the above-described problems are further solved.

  According to a fifth aspect of the present invention, in addition to the configuration according to any one of the first to fourth aspects, the inner peripheral side seal ring is made of a fluororesin, thereby further solving the above-described problem. is there.

  The present invention according to claim 6 further solves the above-described problem by being used as a bucket conveyor chain in addition to the configuration according to any one of claims 1 to 5.

  Therefore, the present invention comprises a pair of left and right inner plates that are spaced apart, a pair of front and rear bushes that are press-fitted into the bushing press-fit holes of the inner plate, a pair of front and rear connection pins that are loosely fitted to the bushes, and a connection pin. A pair of left and right outer plates each forming a pin press-fitting hole for press-fitting and connecting the inner plate in the longitudinal direction of the chain, and lubricating graphite interposed between the outer peripheral surface of the connecting pin and the inner peripheral surface of the bush, Occurs when lubricating oil or grease is used as a lubricant because it is composed of a sealing mechanism that prevents external leakage of lubricating graphite provided between the inner surface of the outer plate and the outer surface of the inner plate. Lubricating graphite exhibits excellent lubrication performance over a long period of time without inhaling dust in a dusty atmosphere or causing deterioration of the lubricant due to chain drive over a long period of time In addition, it exhibits excellent heat resistance in a high-temperature atmosphere, and the sealing mechanism suppresses leakage of lubricating graphite due to centrifugal force generated by circular running during chain operation, etc. for a long time without external lubrication In addition to being able to drive the chain smoothly, the following unique effects can be achieved.

  According to the solid lubricated seal chain of the present invention according to claim 1, two elastic seal rings of the inner peripheral side seal ring and the outer peripheral side elastic seal ring are provided between the inner side surface of the outer plate and the outer side surface of the inner plate. As a result, the inner side elastic seal ring and the outer side elastic seal ring seal double between the inner side surface of the outer plate and the outer side surface of the inner plate, and the outer peripheral surface of the connecting pin and the bush In order to prevent external leakage of graphite wear powder generated from lubricated graphite interposed between the inner peripheral surface and the outer dust from entering between the inner surface of the outer plate and the outer surface of the inner plate. The chain wear and elongation can be prevented over a long period of time without lubrication from the outside.

  Also, when either the inner peripheral side elastic seal ring or the outer peripheral side elastic seal ring is damaged by wear, the other inner peripheral side elastic seal ring or outer peripheral side elastic seal ring that is not damaged by wear is sealed. Since the performance is exhibited, the certainty of the sealing performance by the sealing mechanism can be improved.

  Further, as described above, the inner peripheral side elastic seal ring and the outer peripheral side elastic seal ring are respectively provided between the inner side surface of the outer plate and the outer side surface of the inner plate, so that graphite having a small particle size and weight is provided. It is possible to adopt a material suitable for wear powder leakage prevention function as the material of the inner circumference side elastic seal ring, and to prevent the intrusion of foreign matters such as iron ore, coal, gravel and external dust with large particle size and weight Since a material suitable for the function can be adopted as the material of the outer peripheral side elastic seal ring, both the functions of preventing leakage of graphite wear powder and preventing entry of external dust can be maximized.

  Further, the inner circumferential elastic seal ring is held between the bushing protruding end portion and the inner circumferential seal ring, and the outer circumferential elastic seal ring is formed on the annular seal receiving member. By holding in a state of being sandwiched between the portion and the outer peripheral seal ring, the inner link made up of the inner plate and the bush is driven in the chain width direction and the chain with respect to the outer link made up of the outer plate and the connecting pin when the chain is driven. Even when unevenly distributed in the longitudinal direction, the pinching force between the outer link and the inner link is distributed and received by the two elastic seal rings of the inner peripheral side elastic seal ring and the outer peripheral side elastic seal ring. And damage to the outer peripheral elastic seal ring can be suppressed.

  In addition, the outer peripheral side seal ring is disposed so as to be in sliding contact with the outer surface of the inner plate, and the inner peripheral side seal ring is in sliding contact with the inner side surface of the disc-shaped seal receiving portion formed on the annular seal receiving member. As a result, when the inner link is unevenly distributed in the longitudinal direction of the chain with respect to the outer link when the chain is pulled, the outer peripheral side seal ring and the outer peripheral side elastic seal ring move the annular seal receiving member in the longitudinal direction of the chain. Since the inner peripheral side seal ring and the inner peripheral side elastic seal ring move following the movement of the bush protruding end portion in the chain longitudinal direction, the outer peripheral side seal ring and the annular seal receiving member From the inner peripheral side seal ring and the bushing protruding end portion. Luling is possible to reduce the clamping pressure to undergo.

  Also, when a graphite wear powder leakage path occurs between the inner surface of the outer plate and the outer surface of the inner plate due to wear damage of the inner peripheral elastic seal ring or the outer peripheral elastic seal ring, In order to suppress external leakage of graphite wear powder due to centrifugal force etc. caused by circular running during chain operation, and to suppress the intrusion of external dust, the leakage path of graphite wear powder is complicatedly bent and exhibits a labyrinth structure. The sealing performance by the sealing mechanism can be maintained for a long time.

  The disk-shaped seal receiving portion of the annular seal receiving member made of steel is interposed between the end surface of the bush protruding end portion and the inner surface of the outer plate, so that the inner surface of the outer plate and the bush protruding end portion are Since sliding contact with the end face is completely avoided, if only the disc-shaped seal receiving part has a small surface roughness, there is no need to finish the inner surface of the outer plate as before. In addition, since the displacement of the inner link in the chain width direction with respect to the outer link, which tends to occur due to sliding contact wear between the inner surface of the outer plate and the end surface of the bushing protruding end portion, is suppressed, The inner and outer elastic seal rings and the outer elastic seal ring, which tend to occur on the side where the inner link is offset in the width direction of the chain and the gap between the inner and outer plates is narrowed, are suppressed. It is possible to prevent deterioration of the seal life, also, it is possible to prevent deterioration of the sealing performance due to the conventional inner plate and the gap widened often incomplete sealing state occurs on the side of the outer plate like.

  In addition, because the steel outer seal ring is arranged on the outermost periphery of the seal mechanism, foreign matters such as iron ore, coal, and gravel enter between the inner surface of the outer plate and the outer surface of the inner plate. Therefore, damage to the annular seal receiving member, the inner peripheral side elastic seal ring, the inner peripheral side seal ring, and the outer peripheral side elastic seal ring can be prevented.

  Further, since the annular seal receiving member is fitted and fixed to the connecting pin and is in contact with the inner surface of the outer plate, there is no relative movement between the annular seal receiving member and the outer plate, and the annular seal receiving member and the outer plate Since sliding contact with the plate can be completely avoided, it is possible to prevent deterioration of the sealing performance due to wear damage of the annular seal receiving member.

  According to the solid lubricated seal chain of the present invention according to claim 2, in addition to the effect exhibited by the solid lubricated seal chain according to claim 1, the outer peripheral surface of the rim-shaped seal receiving portion formed in the annular seal receiving member is The diameter is reduced from the outer plate side to the inner plate side, and the inner peripheral surface of the outer peripheral side seal ring is reduced from the outer plate side to the inner plate side. The amount of cross-sectional deformation of the outer peripheral elastic seal ring interposed between the rim-shaped seal receiving portion formed on the annular seal receiving member and the outer peripheral seal ring is smaller than the amount of movement approaching the outer plate. Therefore, the durability of the outer peripheral side elastic seal ring can be improved, and the seal life of the outer peripheral side elastic seal ring can be suppressed over a long period of time.

  Also, when the chain is assembled, after the outer peripheral surface of the connecting pin is fitted and fixed, the annular seal receiving member is assembled to the inner surface side of the outer plate, and then the outer peripheral elastic seal ring is arranged on the outer peripheral surface side of the annular seal receiving member. By disposing the outer peripheral side seal ring on the outer peripheral surface side of the outer peripheral side elastic seal ring, the assembly of the annular seal receiving member, the outer peripheral side elastic seal ring, and the outer peripheral side seal ring is achieved. Chain assembly can be easily achieved without the need, and the outer peripheral elastic seal ring presses the outer seal ring toward the outer surface of the inner plate after the chain is assembled. Can be held in sliding contact with the side.

  According to the solid lubricated seal chain of the present invention according to claim 3, in addition to the effect exerted by the solid lubricated seal chain according to claim 1 or 2, the outer peripheral surface of the bushing protruding end portion is exposed from the inner plate side. The diameter is reduced toward the plate side and the inner peripheral surface of the inner peripheral side seal ring is reduced from the inner plate side toward the outer plate side. Since the amount of cross-sectional deformation of the inner elastic seal ring interposed between the bushing protruding end portion and the inner peripheral seal ring is smaller than the approaching movement amount, the durability of the inner peripheral elastic seal ring is reduced. And the seal life of the inner circumferential elastic seal ring can be suppressed over a long period of time.

  Further, when the chain is assembled, the inner peripheral side seal ring is disposed on the outer peripheral surface side of the inner peripheral side elastic seal ring after the inner peripheral side elastic seal ring is disposed on the outer peripheral surface side of the bushing protruding end portion. To achieve the assembly of the elastic seal ring and the inner peripheral side seal ring, the chain assembly can be easily achieved without requiring excessive work load, and the inner peripheral side elastic seal ring is installed on the inner peripheral side after the chain is assembled. Since the seal ring is pressed toward the inner surface of the disk-shaped seal receiving portion formed on the annular seal receiving member, the inner peripheral seal ring can be held in a state of sliding contact with the inner surface of the disk-shaped seal receiving portion.

  According to the solid lubricating seal chain of the present invention according to claim 4, in addition to the effect exhibited by the solid lubricating seal chain according to claim 3, the outer peripheral surface of the rim-shaped seal receiving portion formed on the annular seal receiving member and The inclination angle of the inner peripheral surface of the outer peripheral side seal ring with respect to the chain width direction is set smaller than the inclination angle of the outer peripheral surface of the bushing protruding end portion and the inner peripheral surface of the inner peripheral side seal ring with respect to the chain width direction. When the inner link is unevenly distributed in the chain width direction with respect to the outer link when the chain is driven, the outer peripheral elastic seal ring is deformed by being sandwiched between the rim-shaped seal receiving portion formed on the annular seal receiving member and the outer peripheral seal ring. Is less than the deformation amount of the inner peripheral elastic seal ring which is deformed by being pinched by the bushing protruding end portion and the inner peripheral seal ring. The outer side elastic seal ring can be designed to be harder and larger than the inner side seal ring without hindering smooth chain drive, and the outer side elastic seal against foreign matter such as iron ore, coal, gravel and external dust with large particle size and weight The ring intrusion prevention function can be improved and the durability of the outer peripheral elastic seal ring can be greatly improved.

  According to the solid lubricated seal chain of the present invention according to claim 5, in addition to the effect exhibited by the solid lubricated seal chain according to any one of claims 1 to 4, the inner peripheral seal ring is made of a fluororesin. The fluororesin itself exhibits its excellent sliding characteristics and reduces the sliding resistance between the inner circumference side seal ring and the disc-shaped seal receiving part formed on the annular seal receiving member when the chain is bent. In addition, since the fluororesin itself exhibits self-lubricating properties even when no lubricated graphite is supplied between the annular seal receiving member and the inner peripheral side seal ring, a smooth chain bending motion is achieved and the inner peripheral Sliding wear between the side seal ring and the disc-shaped seal receiving portion can be reduced.

  According to the solid lubrication seal chain of the present invention concerning Claim 6, in addition to the effect which the solid lubrication seal chain according to any one of Claims 1 thru / or 5 shows, it is used as a bucket conveyor chain. Even when used in a dusty atmosphere, it is incorporated in a continuous unloader that unloads steel stone and coal, and exhibits excellent sealing performance, that is, external leakage of graphite wear powder intervening between the bushing and the connecting pin As well as suppressing the intrusion of steel stones, coal, and external dust, smooth chain drive over a long period in an oil-free state can be realized.

BRIEF DESCRIPTION OF THE DRAWINGS The whole schematic diagram which shows the solid lubrication seal chain which is one Example of this invention. The top view which looked at the solid lubrication seal chain from the side. The perspective view which notched some solid lubrication seal chains. Sectional drawing which shows a solid lubrication seal chain. Sectional drawing which shows the principal part of a solid lubrication seal chain.

  The present invention includes a pair of spaced apart left and right inner plates, a pair of front and rear bushes press-fitted into a bush press-fitting hole of the inner plate, a pair of front and rear connection pins loosely fitted into the bush, and a connection pin A pair of left and right outer plates in which a pin press-fitting hole to be fitted is formed to connect the inner plate in the chain longitudinal direction, lubricating graphite interposed between the outer peripheral surface of the connecting pin and the inner peripheral surface of the bush, and the outer plate The sealing mechanism is provided between the inner surface of the inner plate and the outer surface of the inner plate to prevent the leakage of the lubricating graphite, and the sealing mechanism is fitted and fixed to the connecting pin so as to contact the inner surface of the outer plate. In addition, a disc-shaped seal receiving portion and an outer peripheral side of the disc-shaped seal receiving portion interposed between the end surface of the bush protruding end portion that partially protrudes from the outer surface of the inner plate and the inner surface of the outer plate An annular seal receiving member having a rim-shaped seal receiving portion that bulges toward the inner plate, and an inner peripheral side of the rim-shaped seal receiving portion of the annular seal receiving member, and slides on the inner surface of the annular seal receiving member. An inner circumferential seal ring that is in contact, an inner circumferential elastic seal ring that is sandwiched between the inner circumferential surface of the inner circumferential seal ring and the outer circumferential surface of the bushing protruding end portion, and the outer circumferential side of the annular seal receiving member An outer peripheral seal ring made of steel that is disposed and slidably contacts the outer surface of the inner plate, and an outer peripheral elastic seal ring that is interposed between the inner peripheral surface of the outer peripheral seal ring and the outer peripheral surface of the annular seal receiving member. And prevents leakage of lubricating graphite and intrusion of external dust when the chain is in operation, and suppresses sliding wear between the outer peripheral surface of the connecting pin and the inner peripheral surface of the bush, and the outer plate Specific examples are those that can maintain excellent sealing performance and seal life over a long period of time without surface finishing, and that can prevent damage to the elastic seal ring and easily achieve chain assembly. Any embodiment may be used.

  For example, the solid lubricating seal chain of the present invention may be a roller chain or a bush chain.

  In addition, regarding the specific durability of the lubricating graphite incorporated in the solid lubricating seal chain of the present invention, if it has excellent lubricating performance and heat resistance, it is made of 100% natural graphite, artificial graphite 100 %, Or those formed with 100% of these mixed graphites may be used.

  In addition, as for specific materials of the outer peripheral side elastic seal ring and the inner peripheral side elastic seal ring incorporated in the solid lubricating seal chain of the present invention, nitrile rubber, nylon can be used as long as they have wear resistance and shape stability. In particular, when nitrile rubber is used, the nitrile rubber is excellent in elasticity, wear resistance, and shape stability, and is caused by sliding contact with other components. It is more preferable because it suppresses deterioration of the sealing performance and maintains a stable ring shape of, for example, an O-ring over a long period of time to realize a smooth bending operation of the chain.

  In addition, specific materials for the outer peripheral side seal ring and the inner peripheral side seal ring incorporated in the solid lubricating seal chain of the present invention are aluminum, steel, stainless steel as long as they have impact resistance and wear resistance. Any of chrome molybdenum steel and the like may be used. Particularly, when chrome molybdenum steel is used, it is more preferable because it exhibits excellent strength and suppresses sliding contact with other components. When these materials are subjected to nitriding treatment, the strength is improved and the coefficient of friction is decreased, so that sliding contact with other constituent members is suppressed and smooth chain bending is realized, which is more preferable.

  In addition, as for the specific material of the inner peripheral side seal ring incorporated in the solid lubricating seal chain of the present invention, as long as it has sliding characteristics, wear resistance, and shape stability, fluororesin, nylon resin, Any of polyurethane, etc., may be used. Especially when fluororesin is used, the fluororesin itself exhibits its excellent sliding characteristics, self-lubrication and durability, and the inner circumference side seal when the chain is bent The sliding resistance between the ring and the disc-shaped seal receiving portion formed on the annular seal receiving member is reduced, which is more preferable.

Hereinafter, a solid lubricating seal chain 100 according to an embodiment of the present invention will be described with reference to the drawings.
Here, FIG. 1 is a partial sectional view showing an overall outline of a solid lubricant seal chain according to an embodiment of the present invention, and FIG. 2 is a plan view showing the solid lubricant seal chain as viewed from the side, 3 is an enlarged perspective view showing a main part of the solid lubricant seal chain, FIG. 4 is a cross-sectional view showing the solid lubricant seal chain, and FIG. 5 shows a seal mechanism incorporated in the solid lubricant seal chain. It is sectional drawing shown as a center.

  First, a solid lubricating seal chain 100 according to an embodiment of the present invention is used as a bucket conveyor chain used in a continuous unloader for unloading iron ore, coal, and the like. As shown in the figure, a pair of left and right inner plates 110 spaced apart, a pair of front and rear bushes 120 press-fitted into the bushing press-fit holes of the inner plate 110, and a pair of front and rear rollers fitted on the bush 120 130, a pair of front and rear connection pins 140 loosely fitted to the bush 120, and a pair of left and right outer plates that connect the inner plate 110 in the longitudinal direction of the chain by forming pin press-fitting holes for press-fitting the connection pins 140 respectively. 150, lubricating graphite interposed between the outer peripheral surface of the connecting pin 140 and the inner peripheral surface of the bush 120, and the inner side of the outer plate 150 It is composed of a sealing mechanism 160 for preventing external leakage of the lubricating graphite provided between the outer surface of the inner plate 110 and.

Therefore, a specific form of the seal mechanism 160, which is the most characteristic feature of the solid lubricant seal chain 100 of this embodiment, will be described in detail with reference to FIGS.
First, as shown in FIGS. 3 to 5, the seal mechanism 160 is fitted and fixed to the connecting pin 140 so as to contact the inner surface of the outer plate 150 and partially protrude from the outer surface of the inner plate 110. A disc-shaped seal receiving portion 161a interposed between the end surface of the portion 121 and the inner surface of the outer plate 150; a rim-shaped seal receiving portion 161b bulging toward the inner plate 110 on the outer peripheral side of the disc-shaped seal receiving portion 161a; An annular seal receiving member 161 made of chrome molybdenum steel (SCM435, SCM440) or the like subjected to nitriding treatment, and an annular seal disposed on the inner peripheral side of the rim-shaped seal receiving portion 161b of the annular seal receiving member 161 An inner peripheral side seal ring 162 made of a fluororesin that is in sliding contact with the inner side surface of the receiving member 161, and the inner peripheral side seal The inner peripheral elastic seal ring 163 made of nitrile rubber (NBR) interposed between the inner peripheral surface of the ring 162 and the outer peripheral surface of the bush protruding end portion 121 and the outer peripheral side of the annular seal receiving member 161 The outer peripheral side seal ring 164 made of chrome molybdenum steel (SCM435, SCM440) and the like, which is slidably contacted with the outer surface of the inner plate 110, and the inner peripheral surface of the outer peripheral side seal ring 164 and the rim-shaped seal receiving portion It is comprised from the outer peripheral side elastic seal ring 165 which consists of nitrile rubber (NBR) pinched | interposed between the outer peripheral surfaces of 161b.

  As shown in FIGS. 3 to 5, the outer peripheral surface of the rim-shaped seal receiving portion 161b formed on the annular seal receiving member 161 is reduced in diameter from the outer plate 150 side toward the inner plate 110 side. The inner peripheral surface of the outer peripheral side seal ring 164 is reduced in diameter from the outer plate 150 side toward the inner plate 110 side.

  Further, as shown in FIGS. 3 to 5, the outer peripheral surface of the bushing protruding end portion 121 is reduced in diameter from the inner plate 110 side toward the outer plate 150 side, and the inner periphery of the inner peripheral side seal ring 162. The surface is reduced in diameter from the inner plate 110 side toward the outer plate 150 side.

  Further, as shown in FIG. 5, the inclination angle AO of the outer peripheral surface of the rim-shaped seal receiving portion 161b formed on the annular seal receiving member 161 and the inner peripheral surface of the outer peripheral seal ring 164 with respect to the chain width direction is the bush protruding end. The inclination angle AI of the outer peripheral surface of the portion 121 and the inner peripheral surface of the inner peripheral side seal ring 162 with respect to the chain width direction is set to be smaller.

  Further, as shown in FIG. 5, the outer peripheral side elastic seal ring 165 is set to be larger and harder than the inner peripheral side seal ring 162, and foreign particles such as iron ore, coal, gravel, etc. having a large particle size and a large weight, and external dust The outer peripheral side elastic seal ring 165 is designed to improve the function of preventing the intrusion of the outer peripheral side elastic seal ring 165 and to greatly improve the durability of the outer peripheral side elastic seal ring 165.

  Further, the inner peripheral surface of the inner peripheral side seal ring 162 that is in sliding contact with the inner peripheral side elastic seal ring 163 is machined and designed to have a low coefficient of friction. Is to be reduced.

  Further, as shown in FIG. 4, a positioning reduced diameter step portion 141 for positioning the press-fitting position of the outer plate 150 with respect to the connecting pin 140 is formed on the outer peripheral surface of the connecting pin 140, and the outer surface of the inner plate 110 It is designed so that the sealing performance by the sealing mechanism 160 can be reliably exhibited by accurately adjusting the mutual distance between the outer plate 150 and the inner surface.

The solid lubricated seal chain 100 of the present embodiment obtained in this manner has an inner peripheral seal ring 162 and an outer peripheral elastic seal ring 165 between the inner surface of the outer plate 150 and the outer surface of the inner plate 110. Two elastic seal rings are provided.
Therefore, the inner peripheral side elastic seal ring 163 and the outer peripheral side elastic seal ring 165 provide a double seal between the inner surface of the outer plate 150 and the outer surface of the inner plate 110, and the outer peripheral surface of the connecting pin 140 and the bushing. 120 prevents external wear of graphite wear powder generated from lubricated graphite interposed between the inner peripheral surface of 120 and reliably intrudes external dust from between the inner surface of outer plate 150 and the outer surface of inner plate 110. Therefore, the chain wear and elongation can be prevented over a long period of time without lubrication from the outside.

  Further, even when either one of the inner peripheral side elastic seal ring 163 or the outer peripheral side elastic seal ring 165 is damaged by wear, the other inner peripheral side elastic seal ring 163 or outer peripheral side elastic seal that is not damaged by wear is also generated. Since the ring 165 exhibits the sealing performance, the reliability of the sealing performance by the sealing mechanism 160 can be improved.

Further, an inner peripheral elastic seal ring 163 and an outer peripheral elastic seal ring 165 are provided between the inner surface of the outer plate 150 and the outer surface of the inner plate 110, respectively.
Therefore, it is possible to employ a material suitable for the leakage preventing function of graphite wear powder having a small particle size and weight as the material of the inner peripheral elastic seal ring 163, and iron ore having a large particle size and weight, coal, Since it is possible to adopt a material suitable for the intrusion prevention function of foreign matter such as gravel and external dust as the material of the outer peripheral side elastic seal ring 165, both functions of preventing the leakage of graphite wear powder and the intrusion prevention function of external dust Can be maximized respectively.

Further, the inner peripheral elastic seal ring 163 is held between the bush protruding end portion 121 and the inner peripheral seal ring 162 and the outer peripheral elastic seal ring 165 is attached to the annular seal receiving member 161. The rim-shaped seal receiving portion 161b formed and the outer peripheral side seal ring 164 are held in a sandwiched state.
Therefore, even when the inner link consisting of the inner plate 110 and the bush 120 is unevenly distributed in the chain width direction and the chain longitudinal direction with respect to the outer link consisting of the outer plate 150 and the connecting pin 140 when the chain is driven, Since the clamping force by the link is distributed and received by the two elastic seal rings of the inner peripheral elastic seal ring 163 and the outer peripheral elastic seal ring 165, the inner peripheral elastic seal ring 163 and the outer peripheral elastic seal ring 165 are damaged. Can be suppressed.

Further, the outer peripheral side seal ring 164 is disposed so as to be in sliding contact with the inner side surface of the inner plate 110, and the inner peripheral side seal ring 162 of the disc-shaped seal receiving portion 161 a formed on the annular seal receiving member 161. It arrange | positions so that an inner surface may be slidably contacted.
Therefore, when the inner link is unevenly distributed in the longitudinal direction of the chain with respect to the outer link when the chain is pulled, the outer peripheral side seal ring 164 and the outer peripheral side elastic seal ring 165 follow the movement of the annular seal receiving member 161 in the longitudinal direction of the chain. And the inner peripheral side seal ring 162 and the inner peripheral side elastic seal ring 163 follow the movement of the bush protruding end portion 121 in the longitudinal direction of the chain, so that the outer peripheral side seal ring 164 and the annular seal receiver The clamping pressure received by the outer peripheral side elastic seal ring 165 from the member 161 can be reduced, and the clamping pressure received by the inner peripheral side elastic seal ring 163 from the inner peripheral side seal ring 162 and the bush protruding end portion 121 can be reduced.

  Further, a leakage path of graphite wear powder was generated between the inner surface of the outer plate 150 and the outer surface of the inner plate 110 due to wear damage or the like of the inner peripheral elastic seal ring 163 or the outer peripheral elastic seal ring 165. Even in this case, the leakage path of graphite wear powder is bent in a complicated manner to form a labyrinth structure, which suppresses external leakage of graphite wear powder caused by centrifugal force generated by circular running during chain operation and prevents external dust from entering. Therefore, the sealing performance of the sealing mechanism 160 can be maintained over a long period of time.

Further, a disc-shaped seal receiving portion 161a of an annular seal receiving member 161 made of chrome molybdenum steel (SCM435, SCM440) or the like is interposed between the end surface of the bush protruding end portion 121 and the inner surface of the outer plate 150.
Therefore, sliding contact between the inner side surface of the outer plate 150 and the end surface of the bushing protruding end portion 121 is completely avoided. Therefore, if only the disk-shaped seal receiving portion 161a is made to have a small surface roughness, the conventional one is used. Thus, it is not necessary to finish the inner surface of the outer plate 150, and the outer link tends to be caused by sliding contact between the inner surface of the outer plate 150 and the end surface of the bushing protruding end portion 121. The inner link tends to occur on the side where the gap between the inner plate 110 and the outer plate 150 is narrowed because the inner link is offset in the chain width direction and the inner link is displaced in the chain width direction. The wear damage of the side elastic seal ring 163 and the outer peripheral side elastic seal ring 165 can be suppressed to prevent the seal life from being shortened. The decrease in sealing performance can be prevented by liable to occur imperfect sealing state clearance is wider side of the rate 110 and the outer plate 150.

Further, the outer peripheral side seal ring 164 made of stainless steel is disposed on the outermost peripheral side of the seal mechanism 160.
Therefore, foreign matters such as iron ore, coal, and gravel are prevented from entering between the inner side surface of the outer plate 150 and the outer side surface of the inner plate 110, so that the annular seal receiving member 161 and the inner peripheral side elastic seal ring 163 are provided. In addition, damage to the inner peripheral seal ring 162 and the outer peripheral elastic seal ring 165 can be prevented.

Further, the annular seal receiving member 161 is fitted and fixed to the connecting pin 140 and is in contact with the inner surface of the outer plate 150.
Therefore, there is no relative movement between the annular seal receiving member 161 and the outer plate 150, and the sliding contact between the annular seal receiving member 161 and the outer plate 150 can be completely avoided. It is possible to prevent the deterioration of the sealing performance due to.

The outer peripheral surface of the rim-shaped seal receiving portion 161b formed in the annular seal receiving member 161 is reduced in diameter from the outer plate 150 side toward the inner plate 110 side, and the inner peripheral surface of the outer peripheral side seal ring 164 is The diameter is reduced from the outer plate 150 side toward the inner plate 110 side.
Therefore, the inner plate 110 is interposed between the rim-shaped seal receiving portion 161b formed on the annular seal receiving member 161 and the outer peripheral side seal ring 164 rather than the amount of movement of the inner plate 110 approaching the outer plate 150 when the chain is driven. Since the amount of cross-sectional deformation of the outer peripheral elastic seal ring 165 is reduced, the durability of the outer peripheral elastic seal ring 165 can be improved, and the seal life of the outer peripheral elastic seal ring 165 can be suppressed over a long period of time.

  Further, when the chain is assembled, after the outer peripheral surface of the connecting pin 140 is fitted and fixed and the annular seal receiving member 161 is assembled on the inner surface side of the outer plate 150, the outer peripheral elastic side is formed on the outer peripheral surface side of the annular seal receiving member 161. By disposing the seal ring 165 and disposing the outer peripheral seal ring 164 on the outer peripheral surface side of the outer peripheral elastic seal ring 165, the annular seal receiving member 161, the outer peripheral elastic seal ring 165, and the outer peripheral seal ring 164 are assembled. Therefore, the chain can be easily assembled without requiring an excessive work load, and after the chain is assembled, the outer peripheral side elastic seal ring 165 points the outer peripheral side seal ring 164 toward the outer surface of the inner plate 110. The outer peripheral seal ring 164 is slid against the outer surface of the inner plate 110 to It can be held in a state that.

Further, the outer peripheral surface of the bush protruding end portion 121 is reduced in diameter from the inner plate 110 side toward the outer plate 150 side, and the inner peripheral surface of the inner peripheral side seal ring 162 is extended from the inner plate 110 side to the outer plate. The diameter is reduced toward the 150 side.
Therefore, the inner peripheral side elastic seal ring 163 interposed between the bushing protruding end portion 121 and the inner peripheral side seal ring 162 rather than the amount of movement of the inner plate 110 approaching the outer plate 150 when the chain is driven. Since the amount of cross-sectional deformation becomes small, the durability of the inner peripheral side elastic seal ring 163 can be improved, and the seal life of the inner peripheral side elastic seal ring 163 can be suppressed over a long period of time.

  Further, when the chain is assembled, the inner peripheral side seal ring 162 is disposed on the outer peripheral surface side of the inner peripheral elastic seal ring 163 after the inner peripheral elastic seal ring 163 is disposed on the outer peripheral surface side of the bushing protruding end portion 121. In order to achieve the assembly of the inner circumference side elastic seal ring 163 and the inner circumference side seal ring 162, the chain can be easily assembled without requiring an excessive work load, and the inner circumference side elasticity after the chain is assembled. Since the seal ring 163 presses the inner peripheral side seal ring 162 toward the inner surface of the disc-shaped seal receiving portion 161a formed on the annular seal receiving member 161, the inner peripheral side seal ring 162 is pressed inside the disc-shaped seal receiving portion 161a. Can be held in sliding contact with the side.

In addition, the inclination angle AO of the outer peripheral surface of the rim-shaped seal receiving portion 161b formed on the annular seal receiving member 161 and the inner peripheral surface of the outer peripheral side seal ring 164 with respect to the chain width direction is such that the outer peripheral surface and inner The inclination angle AI of the inner peripheral surface of the circumferential seal ring 162 with respect to the chain width direction is set to be smaller.
Therefore, when the inner link is unevenly distributed in the chain width direction with respect to the outer link when the chain is driven, the inner link is deformed by being pinched by the rim-shaped seal receiving portion 161b formed on the annular seal receiving member 161 and the outer peripheral side seal ring 164. Since the deformation amount of the outer peripheral side elastic seal ring 165 is smaller than the deformation amount of the inner peripheral side elastic seal ring 163 deformed by being pinched by the bushing protruding end portion 121 and the inner peripheral side seal ring 162, smooth chain driving The outer peripheral side elastic seal ring 165 can be designed to be harder and larger than the inner peripheral side seal ring 162 without obstructing the outer peripheral side, and the outer peripheral side elastic seal ring 165 against foreign matters such as iron ore, coal, gravel, etc., which are large in particle size and heavy, and external dust. Intrusion prevention function can be improved, and the durability of the outer peripheral side elastic seal ring 165 can be greatly improved.

Moreover, the inner peripheral side seal ring 162 is molded from a fluororesin.
Therefore, the fluororesin itself exhibits its excellent sliding characteristics, and the sliding resistance between the inner circumferential side seal ring 162 and the disc-shaped seal receiving portion 161a formed on the annular seal receiving member 161 when the chain is bent is reduced. In addition to the reduction, the fluororesin itself exhibits self-lubricating properties even when the lubricating graphite is not supplied between the annular seal receiving member 161 and the inner peripheral seal ring 162, thereby realizing a smooth chain bending motion. In addition, sliding wear between the inner peripheral side seal ring 162 and the disc-shaped seal receiving portion 161a can be reduced.

In the solid lubricating seal chain 100 of the present invention, lubricating graphite is used as a lubricant.
Therefore, the lubricating graphite can be used for a long time without inhaling dust in a dust atmosphere that tends to occur when lubricating oil or grease is used as the lubricant, and without causing deterioration of the lubricant due to long-term chain drive. In addition to exhibiting excellent lubrication performance, it can also exhibit excellent heat resistance performance in a high-temperature atmosphere.

DESCRIPTION OF SYMBOLS 100 ... Solid lubricating seal chain 110 ... Inner plate 120 ... Bush 121 ... Bush protrusion end part 130 ... Roller 140 ... Connecting pin 150 ... Outer plate 160 ... Seal mechanism 161 ... Annular seal receiving member 161a ... Disc-shaped seal receiving part 161b ... Rim-shaped seal receiving part 162 ... Inner peripheral side seal ring 163 ... Inner peripheral side elastic seal ring 164 ... Outer periphery Side seal ring 165 ・ ・ ・ Outer peripheral side elastic seal ring

Claims (6)

A pair of left and right inner plates that are spaced apart, a pair of front and rear bushes that are press-fitted into a bush press-fitting hole of the inner plate, a pair of front and rear connection pins that are loosely fitted to the bush, and a press-fit of the connection pins, respectively A pair of left and right outer plates that connect the inner plates in the longitudinal direction of the chain by forming pin press-fitting holes to be joined, lubricating graphite interposed between the outer peripheral surface of the connecting pin and the inner peripheral surface of the bush, and the outer In a solid lubricating seal chain configured with a sealing mechanism that prevents external leakage of lubricating graphite provided between the inner surface of the plate and the outer surface of the inner plate,
The seal mechanism is fitted and fixed to the connecting pin, contacts the inner surface of the outer plate, and partially protrudes from the outer surface of the inner plate between the end surface of the bushing protruding end portion and the inner surface of the outer plate. An annular seal receiving member having an intervening disc-shaped seal receiving portion and a rim-shaped seal receiving portion that bulges toward the inner plate on the outer peripheral side of the disc-shaped seal receiving portion, and a rim-shaped seal of the annular seal receiving member An inner peripheral seal ring disposed on the inner peripheral side of the receiving portion and slidably contacting the inner side surface of the annular seal receiving member, and an inner peripheral surface of the inner peripheral side seal ring and an outer peripheral surface of the bush protruding end portion An inner circumferential elastic seal ring that is sandwiched and interposed, an outer circumferential seal ring that is disposed on the outer circumferential side of the annular seal receiving member and that is in sliding contact with the outer surface of the inner plate, and the outer circumferential seal ring Solid lubricant seal chain, characterized in that it is composed of an outer peripheral side elastic sealing ring interposed is sandwiched between the inner and outer circumferential surfaces of the annular seal receiving member grayed. The outer peripheral surface of the annular seal receiving member is reduced in diameter from the outer plate side toward the inner plate side,
2. The solid lubricant seal chain according to claim 1, wherein an inner peripheral surface of the outer peripheral side seal ring is reduced in diameter from the outer plate side toward the inner plate side. The outer peripheral surface of the bush protruding end portion is reduced in diameter from the inner plate side toward the outer plate side,
3. The solid lubricant seal chain according to claim 1, wherein an inner peripheral surface of the inner peripheral side seal ring is reduced in diameter from the inner plate side toward the outer plate side. 4.   The inclination angle of the outer peripheral surface of the annular seal receiving member and the inner peripheral surface of the outer peripheral side seal ring with respect to the chain width direction is the inclination of the outer peripheral surface of the bushing projecting end portion and the inner peripheral surface of the inner peripheral side seal ring with respect to the chain width direction. The solid lubricant seal chain according to claim 3, wherein the solid lubricant seal chain is set to be smaller than an angle.   The solid lubricant seal chain according to any one of claims 1 to 4, wherein the inner peripheral side seal ring is made of a fluororesin. The solid lubricating seal chain according to any one of claims 1 to 5, which is used as a bucket conveyor chain.

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