JPH0319129B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a roller chain conveyor.

[Conventional technology]

Conveyors have been used for a long time to transport various raw materials and products, but in recent years, conveyors have been used during the mass production process of parts assembly in the automobile industry, precision machinery and appliances industry, electrical and electronic machinery and appliances industry, etc. Since this system was widely introduced, conveyors have become important not only as transportation equipment but also as production equipment, and have rapidly developed and become widely used in various fields. Therefore, a wide variety of conveyors have already been developed that can fully meet the increasingly harsh usage conditions for each purpose and use.
It is well known that roller chain conveyors such as those illustrated in FIGS. 2 and 3 are widely used in various fields.

The roller chain conveyor shown in Fig. 2 has a small roller (chain roller) 2 fitted on a pin (chain shaft) 1, and a large The large diameter roller (conveyance roller) 3 is loosened, and the small roller 2 is pressed against the rail by the load of the conveyed object placed on the large roller 3, and the chain 5 (inner plate 5'
and an outer plate 5''), the small roller 2 is driven to rotate, and the friction with the small roller 2 rotates the large roller 3 to obtain a conveying speed higher than the speed of the chain 5. In addition, when the conveyed object is stopped, slipping occurs between the large roller 3 and the small roller 2, and the reverse idling action of the large roller 3 against the conveyed object causes slippage between the conveyed object and the conveyed object. This is a mechanism that allows the chain 5 to continue to advance without causing any friction, and the one shown in FIG. It is rotatable, and the bushing 6 is shrink-fitted to the inner plate 5'.
There are cases where the small rollers 2 are loosely fitted to the bushing 6 after being fixed by caulking or welding, and cases where the small rollers 2 on both sides are fixed to the bushing 6 without being fixed to the inner plate 5'. . The former is substantially the same as in FIG. 2, with small rollers 2 on both sides.
The two small rollers 2 on both sides rotate together with the bush 6, which is somewhat advantageous in preventing rolling. I can say that.

[Problem that the invention seeks to solve]

However, these conventional roller chain conveyors require high speeds exceeding 25 m/min, the ability to rise and fall on slopes exceeding 25 degrees, and prevention of meandering phenomena of conveyed goods caused by poor horizontal alignment of the left and right rails. The problem is that it is still insufficient.

[Means to solve the problem]

In order to solve the above problems, this invention has an inner diameter that allows the bushes that fix the inner plates on both sides of the roller chain at a constant interval to pass through in a rotatable state, and a length that reaches the inner surfaces of the inner plates on both the left and right sides. A large roller is integrally formed with a small outer diameter cylindrical part and a large outer diameter cylindrical part at the center sandwiched between these small outer diameter cylindrical parts, and a side surface and an inner part of the large outer diameter cylindrical part of this large roller. A roller chain conveyor consisting of two small rollers rotatably fitted into a small outer diameter cylindrical portion of a large roller between the inner surface of a plate and rails that respectively support the outer peripheral surface of these small rollers. A roller chain conveyor is adopted in which each of the small rollers is formed into a cylindrical shape, and a guide flange is formed on the outer circumferential surface of the small roller so as to be in sliding contact with the side surface of the large outer diameter cylindrical portion.

[Effect]

The axial center of the large roller in this invention is such that the inner surfaces of the small outer diameter cylindrical part and the large outer diameter cylindrical part continuously cover the entire outer circumferential surface of the bush. Unlike the conventional product shown in the example, the large roller 3 does not contact the pin 1 or the bush 6 indirectly through the small roller 2 and in a narrow width, but the entire surface of the bush 6 corresponds to the effective width of the chains 5 on both sides. It is possible to rotate directly and stably over a wide range. Small roller 2 is
Since it is formed into a cylindrical shape and its inner circumferential surface and outer circumferential surface are parallel, it rotates on the rail without lateral deviation. In addition, the outer peripheral surface of the small roller is formed with a guide flange that slides into contact with the side surface of the large outer diameter cylinder, so that the guide flange appropriately contacts the inner surface of the rail and is guided. Sideways displacement of the small rollers due to unevenness of the rails is reliably prevented, and since the large rollers do not come into direct contact with the rails and the rotation of the large rollers is stabilized, the conveyed object does not sway horizontally.

〔Example〕

FIG. 1 shows an embodiment of the invention. i.e. inner plate (also called roller link plate)
5′ and outer plate (also called pin link plate) 5″, a set of two left and right chains 5
In this case, the opposing inner plates 5' are fixed to each other by a bush 6, and the opposing outer plates 5'' are fixed to each other by a pin 1 (a rivet pin or split pin may be used) passing through the bush 6.
The outer plate 5'' can be freely rotated around the rivet pin 1.For such a bush 6, there are cylindrical portions a with a small outer diameter that reach the inner surfaces of the inner plates 5' on both the left and right sides. and a central large outer diameter cylindrical part b sandwiched between these small outer diameter cylindrical parts a.
A large roller 3 is integrally molded with a small outer diameter cylindrical portion a of the large roller 3, and a small roller 2 is fitted into the small outer diameter cylindrical portion a of the large roller 3 in a rotatable state (called loose fitting). It moves while rolling on the upper surface of the rail 4. Further, a guide flange 7 is provided on the outer peripheral surface of the small roller 2 so as to be interposed between the side surface of the large outer diameter cylindrical portion b and the side surface of the rail 4, and the guide flange 7 is in sliding contact with each of the side surfaces. This guides the small roller 2 and indirectly regulates the rotational position of the large roller 3, thereby stably rotating the small roller 2 and the large roller 3.

Now, when a conveyed object is placed on the large roller 3 of this roller chain conveyor, its weight is distributed between the outer circumferential surface of the small roller 2, the upper surface of the rail 4, the inner circumferential surface of the small roller 2, and the small outer diameter cylindrical portion a of the large roller 3. When the chain 5 is moved by increasing the friction at the contact surface of the outer circumferential surface of . If the movement of the conveyed object is stopped in this state, the friction between the conveyed object and the outer circumferential surface of the large roller 3 causes the large roller 3 to move against the friction between the outer circumferential surface of the small outer diameter cylindrical portion a and the inner surface of the small roller 2. As the chain 5 moves, the conveyed objects are sequentially moved away while rolling on the underside of the conveyed objects while rotating in the opposite direction. Therefore, if the materials of the large roller 3 and the small roller 2 are appropriately selected in terms of frictional properties, etc., it is expected that the materials will function satisfactorily in response to the weight of the conveyed object and the rising or falling slope. Can be done.
The material is not particularly limited, but examples include thermoplastic elastomers (TPE), which have the heat resistance of engineering plastics and the flexibility and elasticity of rubber, such as polyurethane block polymers, polyester block polymers,
In addition to polyamide-based block polymers, polystyrene-based or polyolefin-based graft polymers can also be exemplified, but as a general guideline, the melting point is 130 to 250°C, the rebound modulus is 30 to 70%, and the flexural modulus is 4 to 30%. ) × 10 ² Kg/cm ² , hardness ^R [Rockwell] of 90 or less, D [Durometer] of about 40 to 75, and a slightly larger coefficient of friction than engineering plastics, which is preferred for practical purposes. The higher the content of crystalline segments in the elastomer, the more likely it is to produce a "squeak" sound, so it is desirable to keep the content of crystalline segments at 80% or less. Although both the small roller 2 and the large roller 3 are integrally molded, there is no problem even if parts of them, for example, the outer periphery, the shaft core, the side surfaces, and the main body, are molded using two or more different materials. This goes without saying.

〔effect〕

In the roller chain conveyor of the present invention, the large roller 3 is loosely fitted over the entire effective length of the bush 6, and the roller chain conveyor is equipped with a cylindrical small roller having a flange on the outer peripheral surface. Even when the conveyed object is not horizontal or the weight of the conveyed object is not evenly applied to the left and right small rollers 2, the large roller 3 rotates extremely stably, so that the conveyed object does not sway (meander). Such effects are not seen in conventional roller chain conveyors, and by appropriately selecting the materials used in the parts used in this invention, it is possible to achieve high speeds of 25 m/min or more and to move up and down slopes of 25° or more. It also has the added feature of not meandering, making it possible to achieve extremely high safety. Therefore, it can be said that the significance of this invention is very large.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view illustrating the structure of the roller chain conveyor of the present invention, and FIGS. 2 and 3 are axial views of the roller portions illustrating the structure of a conventional roller chain conveyor. FIG. a... Small outer diameter cylindrical part, b... Large outer diameter cylindrical part, 1... Pin, 2... Small roller, 3... Large roller, 4... Rail,
5...Chain, 5'...Inner plate, 5''...Outer plate, 6...Button, 7...Guiding flange.

Claims (1)

[Claims] 1 Small outer diameter cylindrical portions with an inner diameter that allows the bushes that fix the inner plates on both sides of the roller chain at regular intervals to pass through in a freely rotatable state and long enough to reach the inner surfaces of the inner plates on both the left and right sides, and these small outer diameter cylindrical portions. The large roller is integrally molded with the central large outer diameter cylindrical portion held between the large roller and the small outer diameter cylindrical portion of the large roller between the side surface of the large outer diameter cylindrical portion of the large roller and the inner surface of the inner plate. Two small rollers that fit in the possible state,
In a roller chain conveyor consisting of rails that support the outer peripheral surfaces of these small rollers, each of the small rollers is formed into a cylindrical shape, and a guide flange is formed on the outer peripheral surface of the small roller to slide into contact with the side surface of the large outer diameter cylindrical portion. A roller chain conveyor featuring: