JP2014012596A - Conveyor chain with traveling roller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a conveyor chain with a traveling roller, improved in sealing ability of a seal structure and lengthening the life thereof by constructing a grease seal part of the seal structure as a multi-layer seal part including a grease seal layer and a felt seal layer.SOLUTION: A conveyor chain with a traveling roller includes: a traveling roller 140 rotatably supported on a roller shaft 131 through a bearing 145; and a seal structure 150 for preventing foreign matter from entering the bearing 145. The seal structure 150 has a grease seal part 160 having grease G1 sealed in a grease reservoir 153 formed between an outside seal 151 and an inside seal 152. The grease G1 and a felt seal F form a grease seal layer Sg and a felt seal layer Sf, respectively, disposed in a stacking manner in the grease reservoir 153. The grease seal layer Sg and the felt seal layer Sf are axially stacked alternately one by one in three or more layers, each in total.

Description

The present invention relates to a conveyor chain that is provided in a conveying device and conveys a conveyed product, and particularly relates to a conveyor chain with a traveling roller that includes a traveling roller that rolls on a guide rail.
The conveyor chain is attached with a bucket, which is a transport body that accommodates and holds a bulk material (for example, coal) as a transported material. The transport device is, for example, a reclaimer.

  2. Description of the Related Art Conventionally, a conveyor chain with a traveling roller includes a traveling roller that is rotatably supported via a bearing on a roller shaft member that moves in a chain traveling direction together with a connecting pin that flexibly connects an outer link and an inner link. And a seal structure for preventing foreign matter from entering the bearing from the surrounding space. This seal structure includes an outer seal closer to the surrounding space, an inner seal closer to the bearing, and a grease seal portion having grease enclosed in a grease reservoir formed between the outer seal and the inner seal. (For example, see Patent Document 1)

JP 2009-173410 A (paragraphs 0016 to 0018, FIG. 1)

In a conveyor chain with a traveling roller, various dusts and water such as rainwater are present in the surrounding space around the traveling roller, including, for example, coal dust that is a conveyed product. In the seal structure arranged between the surrounding space and the bearing, when dust or water passes through the outer seal as a foreign substance and enters the grease seal portion, the intruding foreign substance that has entered is a grease seal. Stay in the grease.
However, if the amount of invading foreign matter staying in the grease increases with the passage of time of the conveyor chain, the deterioration rate of the grease increases and the sealing performance by the grease decreases. For this reason, there is a problem that the invading foreign matter passes through the grease seal portion and reaches the inner seal, and further passes through the inner seal and enters the bearing, so that the sealing performance of the seal structure having the grease seal portion is deteriorated. there were.
In addition, when the grease seal part is composed of a single grease seal layer, a decrease in sealability due to grease deterioration in the grease seal layer is directly linked to a decrease in the sealability of the entire grease seal part. As a result, there has been a problem that the life of the grease seal portion and thus the life of the seal structure is shortened.

The present invention solves the above-mentioned problems, and an object of the present invention is to make the grease seal portion formed in the grease reservoir of the seal structure a multilayer seal portion composed of a grease seal layer and a filter medium seal layer. Another object of the present invention is to provide a conveyor chain with a traveling roller that improves the sealing performance of the sealing structure and extends its life.
It is another object of the present invention to provide a conveyor chain with a traveling roller in which the energy consumption of the chain drive device is reduced by reducing the rotational resistance of the traveling roller due to the filter medium seal.

  First, the invention according to claim 1 is rotatable via a bearing on a connecting pin that flexibly connects an outer link and an inner link that are adjacent in the chain traveling direction, and a roller shaft member that moves in the chain traveling direction together with the connecting pin. A traveling roller that is supported on the guide rail and that rolls on the guide rail, and a seal structure that is disposed between the bearing and the surrounding space around the traveling roller and prevents foreign matter from entering the bearing from the surrounding space; And the seal structure includes an outer seal closer to the surrounding space, an inner seal closer to the bearing, and a grease sealed in a grease reservoir formed between the outer seal and the inner seal In the conveyor chain with a traveling roller having a portion, the grease seal portion is arranged in the grease reservoir. A grease seal layer and a filter medium seal layer, each of which is a seal layer that is disposed in the grease reservoir in the direction of arrangement of the outer seal and the inner seal. The above-described problems are solved by forming the grease seal layer and the filter medium seal layer alternately in three or more layers in the arrangement direction.

  In the invention according to claim 2, in addition to the configuration of the invention according to claim 1, the grease seal portion includes a plurality of the filter medium seal layers, and the specific filter medium seal layer that is at least one of the filter medium seal layers includes The above-described problem is solved by being disposed between the pair of grease seal layers in the arrangement direction.

  According to a third aspect of the present invention, in addition to the configuration of the first or second aspect of the invention, the seal structure is an outer grease formed by grease covering the entire outer space with respect to the surrounding space. By having the seal, the above-described problems are solved.

  According to a fourth aspect of the present invention, in addition to the configuration of the first aspect of the present invention, the filter media seal is fitted between the roller shaft member and the traveling roller by an interference fit. And the above-mentioned problems are solved by impregnating the filter medium seal with lubricating oil.

  The invention according to claim 5 is the felt seal in which the filter medium seal is formed of felt in addition to the configuration of the invention according to any one of claims 1 to 4, and the felt is made of polyester. And the above-mentioned problems are solved by being formed from polyurethane.

  Therefore, the conveyor chain with a traveling roller of the present invention rotates via a bearing on a coupling pin that connects the outer link and the inner link adjacent in the chain traveling direction so as to be bendable, and a roller shaft member that moves together with the coupling pin in the chain traveling direction. A traveling roller that is supported and rolls on the guide rail, and a seal structure that is disposed between the surrounding space around the traveling roller and the bearing and prevents foreign matter from entering the bearing from the surrounding space, The seal structure includes an outer seal closer to the surrounding space, an inner seal closer to the bearing, and a grease seal portion having grease sealed in a grease reservoir formed between the outer seal and the inner seal. When foreign matter in the space passes through the outer seal of the seal structure and enters the grease reservoir, it enters the grease reservoir. Since the foreign matter (hereinafter referred to as “intrusion foreign matter”) stays in the grease in the grease seal portion, not only can the intrusion of foreign matter into the bearing be suppressed, but also the following unique to the present invention. There is an effect.

That is, according to the conveyor chain with a traveling roller of the present invention according to claim 1, the grease seal portion has one or more filter media seals disposed in the grease reservoir, and the grease and the filter media seal are within the grease reservoir. In addition, a grease seal layer and a filter medium seal layer, which are seal layers stacked in the arrangement direction of the outer seal and the inner seal, are formed, respectively, and the grease seal layer and the filter medium seal layer are alternately arranged one by one in the arrangement direction. By being laminated as described above, the grease seal portion is a multilayer seal portion in which three or more grease seal layers and filter medium seal layers are alternately laminated. Therefore, solid intrusion foreign substances out of intrusion foreign substances are captured by the filter medium seal. Therefore, the grease seal layer closer to the bearing than the filter media seal layer in the arrangement direction (hereinafter referred to as “bearing side grease seal layer”). Solid entering foreign matter is reduced to reach), also a liquid entering the foreign matter is entering foreign matter which has passed through the filtrate material seal layer stays in the grease of the bearing-side grease seal layers. For this reason, since the invading foreign matter reaching the inner seal and the bearing is reduced, the sealability of the grease seal portion can be improved and the service life can be extended, thereby improving the sealability of the seal structure of the conveyor chain with traveling rollers. However, the lifetime can be extended.
Further, the grease sealed in the grease reservoir is held between the pair of filter medium seal layers, between the outer seal and the filter medium seal layer, or between the inner seal and the filter medium seal layer in units of grease seal layers. For this reason, since the outflow from the grease reservoir due to fluidization due to the temperature rise due to the rotation of the traveling roller is suppressed by the filter medium seal, the retention of the grease in the grease reservoir can be improved.

  According to the conveyor chain with a traveling roller of the present invention according to claim 2, in addition to the effect exhibited by the invention according to claim 1, the grease seal portion has a plurality of filter medium seal layers, and at least one filter medium seal layer. Is disposed between the pair of grease seal layers in the arrangement direction, the grease seal layer adjacent to the outer seal side of the specific filter medium seal layer (hereinafter referred to as “previous stage grease seal layer”). )) Is deteriorated by intruding foreign matter and its sealing performance is reduced, solid intruding foreign matter that has passed through the previous grease seal layer is captured by the specific filter media seal layer, and The liquid intruding foreign matter passes through the specific filter medium seal layer and is adjacent to the bearing closer to the bearing than the specific filter medium seal layer. Since residence Le layer "hereinafter. In), it is possible to improve the sealing property of the grease seal portion can be lengthened its life.

  According to the conveyor chain with a traveling roller of the present invention according to claim 3, in addition to the effect of the invention according to claim 1 or 2, the seal structure covers the entire outer seal with respect to the surrounding space. By having an outer grease seal formed of grease, the outer grease seal suppresses the intrusion of foreign matter into the outer seal, so that the sealability of the grease seal portion can be improved and its life can be extended. .

According to the conveyor chain with a traveling roller of the present invention according to claim 4, in addition to the effect exhibited by the invention according to any one of claims 1 to 3, the filter medium seal includes a roller shaft member, a traveling roller, Since the filter medium seal is impregnated with lubricating oil, the filter medium seal is held in the grease reservoir with a simple structure and without moving in the arrangement direction. As a result, the laminated state of the grease seal layer and the filter medium seal layer is reliably maintained, which can contribute to the improvement of the sealing performance of the grease seal portion.
In addition, since the frictional force at the sliding contact portion between the filter medium seal that rotates with the traveling roller and the traveling roller and the roller shaft member is reduced by the lubricating oil impregnated in the filter medium seal, the filter medium seal that is tightly fitted As a result, the rotational resistance of the traveling roller is reduced. For this reason, the friction loss in the traveling roller is reduced, and the energy consumption of the chain driving device that drives the conveyor chain with the traveling roller can be reduced.
Further, since the lubricating oil impregnated in the filter medium seal suppresses the passage of liquid foreign substances, the filter medium seal layer can improve the sealing performance against liquid intruding foreign substances and improve the seal performance of the grease seal portion.

  According to the conveyor chain with a traveling roller of the present invention according to claim 5, in addition to the effect exhibited by the invention according to any one of claims 1 to 4, the felt in which the filter medium seal is formed of felt. Since the felt is made of polyester and polyurethane, the felt made of felt polyester and polyurethane is excellent in strength, dimensional stability and solid foreign matter trapping. It is possible to reduce the thickness of the felt seal in the arrangement direction while ensuring the capturing property. For this reason, the grease seal part having the filter medium seal layer can be reduced in size in the arrangement direction, or the grease seal part can be obtained by increasing the number of filter medium seal layers in the grease reservoir having a predetermined arrangement direction length. The sealing performance can be improved, and the lifetime can be extended.

Sectional drawing in the plane which shows the Example of this invention and is orthogonal to a chain driving | running direction of the conveyor chain with a driving roller, and contains the central axis of a connection pin. The enlarged view of the II part of FIG.

  The conveyor chain with a running roller of the present invention is rotatable via a bearing on a connecting pin that flexibly connects an outer link and an inner link that are adjacent in the chain running direction, and a roller shaft member that moves in the chain running direction together with the connecting pin. The seal structure includes a running roller that is supported and rolls on the guide rail, and a seal structure that is disposed between the surrounding space around the running roller and the bearing and prevents foreign matter from entering the bearing from the surrounding space. Has an outer seal closer to the surrounding space, an inner seal closer to the bearing, and a grease seal portion having grease sealed in a grease reservoir formed between the outer seal and the inner seal, and the grease seal portion One or more filter media seals disposed within the grease reservoir, wherein the grease and filter media seals are disposed within the grease reservoir, A grease seal layer and a filter medium seal layer, which are seal layers arranged in the arrangement direction of the inner seal and the inner seal, are formed respectively, and the grease seal layer and the filter medium seal layer are alternately laminated in three or more layers one by one in the arrangement direction. As a result, the grease seal part formed in the grease reservoir of the seal structure is a multi-layer seal part composed of a grease seal layer and a filter medium seal layer, thereby improving the seal performance of the seal structure and extending its life. As long as it becomes, the specific aspect may be anything.

For example, in the conveyor chain with traveling rollers of the present invention, the traveling rollers may be disposed on both sides of the outer link in the chain width direction.
The conveyed product conveyed by the conveyor chain with a traveling roller of the present invention may be a loose product (for example, coal, iron ore, earth and sand, cereals, etc.) or a scrap product that can be counted.
A conveyance apparatus provided with the conveyor chain with a traveling roller of this invention is a thing other than a reclaimer or a reclaimer.

Embodiments of the present invention will be described below with reference to FIGS.
Referring to FIG. 1, in an embodiment of the present invention, a conveyor chain 100 with a traveling roller including a plurality of traveling rollers 140 (hereinafter referred to as “chain 100”) is a loose article (not shown, for example, (Coal) is provided in a transport device (not shown, for example, a reclaimer).

  In addition to a pair of endless chains 100 arranged in parallel (one chain 100 is shown in FIG. 1), this transport device is stretched over the pair of chains 100. In addition, a pair of sprocket groups that are driven to rotate by a chain drive device (for example, an electric motor) to run the chain 100, a plurality of buckets that are attached to the pair of chains 100 and carry loose objects from the pile, Each traveling roller 140 includes a pair of guide rails R (one guide rail R is indicated by a two-dot chain line in FIG. 1). The bucket is a transporter that accommodates and holds a rose.

  The chain 100 includes a plurality of outer links 110, a plurality of inner links 115, and a plurality of connecting pins 120 that connect the outer links 110 and the inner links 115 that are adjacent to each other in the chain traveling direction. A plurality of bushes 122 that are externally fitted to the pins 120, a plurality of rollers 123 that are rotatably fitted to the respective bushes 122, and a running roller 140 that rolls on the guide rail R when the chain 100 is running. A plurality of travel roller structures 102. Each outer link 110, each inner link 115, each connecting pin 120, each bushing 122, and each roller 123 constitutes a chain body 101.

  Each outer link 110 includes a pair of outer link plates 111 that are spaced apart in the chain width direction. Each traveling roller structure 102 is disposed adjacent to one outer link plate 111a in the chain width direction and outside thereof. The other outer link plate 111b is a transport body attachment link plate to which the bucket is attached via an attachment (not shown). The traveling roller 140 is a side roller that is disposed outside the outer link 110 in the chain width direction.

Each inner link 115 is composed of a pair of inner link plates 116 that are spaced apart between a pair of outer link plates 111 in the chain width direction.
Each connecting pin 120 passes through the pair of inner link plates 116 and is inserted into the pin holes 112 of the pair of outer link plates 111, so that the retaining means (in this embodiment, the large-diameter portion 113 of the connecting pin 120). And the connecting member 135) of the traveling roller structure 102 is prevented from coming off. Each bush 122 is press-fitted and fixed to the pair of inner link plates 116 in its insertion hole 117. The roller 123 is externally fitted to the bush 122 and is rotatably supported, and can mesh with the sprocket group.

  The traveling roller structure 102 supports the traveling roller 140 rotatably with respect to the roller shaft member 130, the roller shaft member 130 that moves in the chain traveling direction together with the connecting pin 120, the traveling roller 140 that is in rolling contact with the guide rail R, and the roller shaft member 130. A bearing 145, a seal body 147, and a seal structure 150 are provided.

The seal body 147 and the seal structure 150 prevent foreign matter from entering the bearing 145 from the surrounding space A that is a space surrounding the chain body 101 and the traveling roller structure 102.
The surrounding space A where the chain main body 101 and the traveling roller structure 102 are exposed is a space in which foreign matter that can enter the bearing 145 exists. The foreign matter includes a solid foreign matter including dust particles and dust other than the loose matter, and a liquid foreign matter including rainwater and a liquid other than rainwater.

The roller shaft member 130 includes a roller shaft 131 disposed coaxially with the connecting pin 120, a cylindrical sleeve 132 that is externally fitted to the roller shaft 131, and an external link plate 111a that is externally fitted to the roller shaft 131. An interval setting ring 133 that defines an axial interval between the traveling roller 140, a holding ring 134 that holds the sleeve 132 on the roller shaft 131 so as not to rotate relative to the roller shaft 131, and the sleeve 132 and both rings 133, 134 on the roller shaft 131. On the other hand, it has the coupling member 135 couple | bonded integrally so that an axial direction movement is impossible.
Here, the axial direction is a direction parallel to the central axis L of the connecting pin 120 and is the chain width direction. Further, the radial direction and the circumferential direction are a radial direction and a circumferential direction around the central axis L, respectively.

The roller shaft 131 extending in the axial direction from the outer link 110 is coupled to the connecting pin 120 by integral molding as a coupling means.
The traveling roller 140 is a cylindrical member that forms an accommodation space 142 in which the roller shaft 131, the bearing 145, the seal body 147, and the seal structure 150 are accommodated.
The coupling member 135 includes a disk-shaped stopper 136 that contacts the holding ring 134 and a bolt 137 as a coupling tool that couples the stopper 136 to the roller shaft 131. The stopper 136 presses the distance setting ring 133 against the outer link plate 111a via the holding ring 134 and the sleeve 132 by the tightening force of the bolt 137, and prevents the rings 133, 134 and the sleeve 132 from moving in the axial direction.

The bearing 145 is axially fixed to the roller shaft 131 and the sleeve 132 by a step 132a (see also FIG. 2) of the sleeve 132 and a holding ring 134 together with an inner seal 152 to be described later. A retaining ring 146 is fixed to the traveling roller 140 in the axial direction.
The seal body 147 includes a cap 148 that seals the accommodation space 142 formed by the inner peripheral surface 141 of the traveling roller 140 on the opposite side of the seal structure 150 across the bearing 145 in the axial direction, and a cap 148. And a retaining ring 149 fixed to the traveling roller 140. In order to enhance the sealing performance by the seal body 147, a liquid gasket may be applied to the cap 148 or the retaining ring 149.

Referring mainly to FIG. 2 and appropriately referring to FIG. 1, the seal structure 150 is disposed between the surrounding space A and the bearing 145 in the axial direction, and is disposed between the sleeve 132 and the traveling roller 140 in the radial direction. Is done.
The seal structure 150 disposed adjacent to the bearing 145 in the axial direction is formed between the outer seal 151 near the surrounding space A, the inner seal 152 near the bearing 145, and the outer seal 151 and the inner seal 152. A grease seal portion 160 having the grease G1 sealed in the grease reservoir 153 and an outer grease seal 155 are provided.
The outer seal 151 and the inner seal 152 are labyrinth seals as non-contact seals, and are detachably attached to the sleeve 132 and the traveling roller 140. The outer seal 151 is fixed to the sleeve 132 and the traveling roller 140 in the axial direction by the interval setting ring 133 and the stepped portion 140 b of the traveling roller 140.

The grease reservoir 153 is an annular space that surrounds the roller shaft 131 in the circumferential direction. The grease seal portion 160 has a grease G1 and one or more felt seals F disposed in the grease reservoir 153. The number of felt seals F included in the grease seal portion 160 is two as a predetermined number which is a plurality in the present embodiment.
The felt seal F is a filter medium seal formed from felt as a filter medium, and is an annular member.

The grease G1 and the felt seal F include a grease seal layer Sg that is a seal layer S that is stacked in the arrangement direction of the outer seal 151 and the inner seal 152 in the grease reservoir 153, and a felt seal layer Sf as a filter medium seal layer. Respectively.
In this embodiment, the arrangement direction is the axial direction, and is a stacking direction in which the grease seal layer Sg and the felt seal layer Sf are stacked between the outer seal 151 and the inner seal 152.
The grease seal portion 160 is a multilayer in which the grease seal layer Sg and the felt seal layer Sf are alternately formed one by one in the axial direction to form a total of three or more seal layers S, and in this embodiment, five seal layers S. It is a seal part. The number of grease seal layers Sg is one larger than the felt seal layer Sf.

The grease seal portion 160 includes an outer end seal layer 161 adjacent to the outer seal 151, an inner end seal layer 162 adjacent to the inner seal 152, and an outer end seal layer 161 and an inner end seal layer 162 in the axial direction. The first to third intermediate seal layers 163 to 165 constituting the three intermediate seal layers, here, are arranged as the seal layer S.
The outer end seal layer 161, the inner end seal layer 162, and the second intermediate seal layer 164 are grease seal layers Sg.
A first intermediate seal layer 163 disposed between the outer end seal layer 161 and the second intermediate seal layer 164 and a third intermediate seal layer 165 disposed between the inner end seal layer 162 and the second intermediate seal layer 164. Is a felt seal layer Sf which is a specific filter medium seal layer.

The felt seal F is an annular plate having a thickness T in the axial direction, and is fitted between the sleeve 132 and the traveling roller 140 by an interference fit. Therefore, in the felt seal F, the inner diameter at the inner peripheral portion Fi is smaller than the outer diameter of the sleeve 132 at the grease reservoir 153, and the outer diameter at the outer peripheral portion Fo is the travel roller 140 in the grease reservoir 153. It is larger than the inner diameter.
The felt seal F is held in contact with the sleeve 132 over the entire circumference at the inner peripheral portion Fi, and with the traveling roller 140 over the entire circumference at the outer peripheral portion Fo.

  The felt seal F is formed of synthetic resin fibers, here polyester fibers and polyurethane fibers, and preferably has a composition of 60% polyester and 40% polyurethane. The felt seal F is impregnated with lubricating oil.

  The outer grease seal 155 is an annular seal that is disposed closer to the surrounding space A than the outer seal 151 in the axial direction and is disposed radially outward with respect to the interval setting ring 133 in the radial direction. The outer grease seal 155 is formed by applying grease G2 so as to cover the entire outer seal 151 with respect to the surrounding space A. The consistency of the grease G2 is smaller than that of the grease G1 of the grease seal layer Sg.

Next, operations and effects of the embodiment configured as described above will be described.
The chain 100 is rotatably supported by a roller shaft 131 via a bearing 145 and rolls on a guide rail R, and a seal structure 150 that prevents foreign matter from entering the bearing 145 from the surrounding space A. The seal structure 150 includes a grease seal portion 160 having a grease G1 sealed in a grease reservoir 153 formed between the outer seal 151 and the inner seal 152.
With this configuration, when a foreign matter existing in the surrounding space A passes through the outer seal 151 and enters the grease reservoir 153, the intruding foreign matter (that is, the foreign matter that has entered the grease reservoir 153) becomes the grease of the grease seal portion 160. Since it stays in G1, the penetration | invasion of the foreign material to the bearing 145 can be suppressed.

In the grease seal portion 160, the grease G1 and the felt seal F form a grease seal layer Sg and a felt seal layer Sf, which are stacked in the axial direction as the arrangement direction in the grease reservoir 153, respectively. Sg and felt seal layers Sf are alternately stacked on five seal layers S one by one in the axial direction.
With this configuration, the grease seal portion 160 is a multilayer seal portion in which the grease seal layers Sg and the felt seal layers Sf are alternately stacked. Therefore, solid intrusion foreign matter out of the intrusion foreign matter is captured by the felt seal F. The solid intrusion foreign matter reaching the second intermediate seal layer 164 and the inner end seal layer 162 as the bearing-side grease seal layer from the first and third intermediate seal layers 163 and 165 as the felt seal layer Sf is reduced, and the felt The liquid intrusion foreign material that has entered the seal layer Sf stays in the grease G1 of the bearing-side grease seal layer (that is, the second intermediate seal layer 164 and the inner end seal layer 162). For this reason, since the invading foreign matter which reaches the inner seal 152 and the bearing 145 is reduced, it is possible to improve the sealability and extend the life of the grease seal portion 160, thereby improving the sealability of the seal structure 150. The lifetime can be extended.

  In addition, the grease G1 sealed in the grease reservoir 153 includes the outer seal 151 and the felt seal layer between the first and third intermediate seal layers 163 and 165 as a pair of felt seal layers Sf in units of the grease seal layer Sg. It is held between the first intermediate seal layer 163 that is Sf and between the inner seal 152 and the third intermediate seal layer 165 that is the felt seal layer Sf. For this reason, since the outflow from the grease reservoir 153 due to fluidization due to the temperature rise due to the rotation of the traveling roller 140 is suppressed by the felt seal F, the retainability of the grease G1 in the grease reservoir 153 can be improved. it can.

Each of the felt seal layers Sf of the grease seal portion 160 is disposed between the pair of grease seal layers Sg in the axial direction as a specific filter medium seal layer.
With this configuration, even if the grease G1 of the outer end seal layer 161 or the third intermediate seal layer 165, which is the pre-stage grease seal layer, is deteriorated by the invading foreign matter and its sealing performance is lowered, it passes through the pre-stage grease seal layer. The solid intrusion foreign matter among the intrusion foreign matter is captured by the first intermediate seal layer 163 or the third intermediate seal layer 165 which is the specific filter medium seal layer, and the liquid intrusion foreign substance among the intrusion foreign substances passes through the specific filter medium seal layer. In addition, since it stays in the second intermediate seal layer 164 or the inner end seal layer 162, which is the latter-stage grease seal layer, the sealability of the grease seal portion 160 can be improved, and its life can be extended.

  The seal structure 150 includes the outer grease seal 155 formed by the grease G2 that covers the entire outer seal 151 with respect to the surrounding space A, so that the outer grease seal 155 suppresses entry of foreign matter into the outer seal 151. Therefore, the sealing performance of the grease seal portion 160 can be improved, and the lifetime can be extended.

Since the felt seal F is fitted between the sleeve 132 and the traveling roller 140 by an interference fit, each felt seal F has a simple structure, and does not move in the axial direction, but in the grease reservoir 153. Thus, the laminated state of the grease seal layer Sg and the felt seal layer Sf is reliably maintained, and it is possible to contribute to the improvement of the sealing performance of the grease seal portion 160.
Further, since the felt seal F is impregnated with lubricating oil, the friction force at the sliding contact portion between the felt seal F rotating around the traveling roller 140 and the traveling roller 140 and the sleeve 132 is impregnated in the felt seal F. Therefore, the rotational resistance of the traveling roller 140 due to the felt seal F that is tightly fitted is reduced. For this reason, the friction loss in the traveling roller 140 is reduced, and the energy consumption of the chain driving device that drives the chain 100 can be reduced.
Furthermore, since the lubricating oil impregnated in the felt seal F suppresses the passage of liquid foreign matter, the sealing property against the liquid intruding foreign matter is improved in the felt seal layer Sf, and the sealing property of the grease seal portion 160 is improved. Can do.

  Further, since the outer end seal layer 161 and the inner end seal layer 162 are the grease seal layer Sg, the outer seal 151, the inner seal 152 and the felt seal are compared with the case where both the seal layers 161 and 162 are the felt seal layer Sf. Since the rotational resistance of the traveling roller 140 due to friction with F decreases, the friction loss in the traveling roller 140 decreases.

  The felt seal F is a felt seal F formed of a felt made of polyester and polyurethane, so that the felt made of felt polyester and polyurethane has strength (that is, deformation resistance), dimensional stability, and trapping of solid foreign matters. Therefore, it is possible to reduce the thickness T of the felt seal F while ensuring the required foreign matter capturing property by the felt seal F. Therefore, the grease seal portion 160 having the felt seal layer Sf can be reduced in size in the axial direction, or the number of the felt seal layers Sf can be increased in the grease reservoir 153 having a predetermined axial length. The sealing property of the grease seal portion 160 can be improved and the life thereof can be extended.

Hereinafter, an example in which a part of the configuration of the above-described embodiment is changed will be described with respect to the changed configuration.
Instead of the roller 123, a traveling roller structure having a traveling roller 140 may be provided. In this case, the connecting pin 120 and the bush 122 constitute a roller shaft member.
In the plurality of grease seal layers Sg or the plurality of felt seal layers Sf, the thicknesses of the grease seal layers Sg in the axial direction or the thicknesses of the felt seal layers Sf in the axial direction are the same. It may be different or different.
The number of grease seal layers Sg may be the same as the felt seal layers Sf or one smaller than the felt seal layers Sf.
At least one of the outer end seal layer 161 and the inner end seal layer 162 may be the felt seal layer Sf. Since the outer end seal layer 161 is the felt seal layer Sf, the intrusion of solid intrusion into the grease seal layer Sg closest to the outer seal 151 can be suppressed, so that deterioration of the grease seal layer Sg due to the intrusion of solid intrusion can be suppressed. can do. Further, since the outer end seal layer 161 and the inner end seal layer 162 are the felt seal layer Sf, the outflow of the grease G1 of the grease seal portion 160 to the outer seal 151 and the inner seal 152 can be suppressed.
The grease seal portion 160 only needs to have at least one felt seal layer Sf as the specific filter medium seal layer.
The filter medium may be a non-woven fabric or a porous member in addition to the felt.
The transport body may be a member other than the bucket as long as it is a member that holds the transported object.

DESCRIPTION OF SYMBOLS 100 ... Conveyor chain 110 with a running roller ... Outer link 115 ... Inner link 120 ... Connecting pin 130 ... Roller shaft member 140 ... Running roller 150 ... Sealing structure 151 ... Outer seal 152 ... Inner seal 153 ... Grease reservoir 155 ... Outer grease seal 160 ... Grease seal portion 161 ... Outer seal layer 162 ... Inner seal layers 163 to 165 ... Intermediate seal layer A ... Ambient space F ... Felt seals G1, G2 ... Grease S ... Seal layer Sg ... Grease seal layer Sf ... Felt seal layer

Claims (5)

A connecting pin that connects the outer link and the inner link adjacent to each other in the chain traveling direction so as to be bendable, and a roller shaft member that moves together with the connecting pin in the chain traveling direction is rotatably supported via a bearing and rolls on a guide rail. And a seal structure disposed between the bearing and the surrounding space around the running roller to prevent foreign matter from entering the bearing from the surrounding space. In a conveyor chain with a traveling roller having an outer seal closer to the space, an inner seal closer to the bearing, and a grease seal portion having grease sealed in a grease reservoir formed between the outer seal and the inner seal ,
The grease seal portion has one or more filter media seals disposed in the grease reservoir;
The grease and the filter medium seal form a grease seal layer and a filter medium seal layer, respectively, which are seal layers arranged in the grease reservoir and stacked in the arrangement direction of the outer seal and the inner seal,
The conveyor chain with running rollers, wherein the grease seal layer and the filter medium seal layer are alternately laminated in three or more layers in the arrangement direction. The grease seal portion has a plurality of the filter media seal layers,
The conveyor chain with a traveling roller according to claim 1, wherein at least one filter medium seal layer as the filter medium seal layer is disposed between the pair of grease seal layers in the arrangement direction. The conveyor chain with a traveling roller according to claim 1 or 2, wherein the seal structure has an outer grease seal formed by grease covering the entire outer seal with respect to the surrounding space. The filter media seal is fitted between the roller shaft member and the traveling roller by an interference fit,
The conveyor chain with a traveling roller according to any one of claims 1 to 3, wherein the filter medium seal is impregnated with lubricating oil. The filter media seal is a felt seal formed of felt,
The conveyor chain with a traveling roller according to any one of claims 1 to 4, wherein the felt is made of polyester and polyurethane.

Images