JP2000344320A - Pneumatic levitation type conveyor belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pneumatic levitation type conveyor belt capable of deforming in good followup performance after the shape of a trough and transporting objects smoothly upon pneumatic levitation of the belt in good performance. SOLUTION: A pneumatic levitation type conveyor belt is embodied in a laminate structure consisting of an upper cover rubber 16, reinforcing core layer 18, and lower cover rubber 20, wherein the core layer 18 is formed from cords consisting of warps 24a arranged in line across the belt width in a high density and wefts 24b arranged coarsely in the belt longitudinal direction for holding the arrangement of the warps 24a. Each cord is structured so that the weft 24b is thinner than the warp 24a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air-floating type conveyor belt which floats by blowing air and conveys a conveyed product in that state.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG.
The air is blown up from the blow-off hole 202 formed at 00, and an air layer is formed between the belt 204 on the trough 200 and the trough 200, and a conveyor belt (hereinafter, referred to as a belt) 2
04 by the belt 204 in a state where the
An air-floating belt conveyor for transporting the belt 6 is known. In the figure, reference numeral 208 denotes a blower for blowing air.

[0003] In the case of this air-floating belt conveyor, the friction between the trough 200 and the belt 204 is small, so that the life of the belt 204 is long, the noise during operation is small, and the belt 204 is formed over the entire length. Has a slack since it is supported via an air layer, and therefore has various advantages such as requiring less power than that of a normal belt conveyor.

Conventionally, a belt having the same configuration as a general conveyor belt has been used as the air levitation type belt. FIG. 8 shows a configuration of a conventional air levitation type belt.

In FIG. 1, reference numeral 210 denotes an upper cover rubber;
4 is a reinforcing core layer, 212 is a lower cover rubber,
Reference numeral 4 denotes a cross-sectional structure in which the upper cover rubber 210, the reinforcing core layer 214, and the lower cover rubber 212 are laminated.

Here, the reinforcing core layer 214 is made of a core canvas 216.
Are laminated. Conventionally, this belt 204
As the core canvas 216 constituting the reinforcing core layer 214 of
As shown in the figure, a plain woven canvas made by plain weaving a warp yarn 216a and a weft yarn 216b has been used.

[0007]

However, when such a plain woven canvas is used as the core canvas 216 constituting the reinforcing core layer 214, the upper cover rubber 210 and the lower cover rubber 212 form the reinforcing core layer 214. And the upper cover rubber 210 is formed thicker than the lower cover rubber 212, so that the amount of contraction of the upper cover rubber 210 after heating and vulcanization during the belt manufacturing is smaller than the amount of contraction of the lower cover rubber 212. And the entire belt 204 tends to be warped upward and deformed as shown in FIG. 8B.

In addition, the core body canvas 21 made of the plain woven canvas described above.
No. 6 also has a large lateral rigidity in the belt width direction.
When the belt 204 is placed on the trough 200, the entire belt 204 does not follow the trough shape well and is deformed. Therefore, when the belt 204 is levitated by air blowing, the entire belt 204 does not float well. There has been a problem that the transfer of the transfer object 206 cannot be performed smoothly.

FIG. 9 shows the deformed shape of the belt 204 together with the trough shape on each of the carrier side and the return side. As shown in FIG. 9, the belt 204 itself warps upward on the carrier side and deforms. As a result, a gap is formed between the belt width direction end and the trough 200C, and as a result, air blown up from the outlet 202 at the bottom portion passes through the space between the trough 200C and the belt 204C, and escapes from the belt width direction end. be able to. That is, an air layer is favorably formed between the trough 200C and the belt 204C.

However, since the belt 204 is turned upside down on the return side, the belt 204 has a large lateral rigidity in the width direction and cannot be deformed to follow the trough shape. 204R
The widthwise end of the belt 204R comes into contact with the trough 200R, so that the air blown up from the outlet 202 does not escape well from the widthwise end of the belt 204R, and the air traps between the center of the belt 204R and the trough 200R. Will occur.

That is, an air layer is not properly formed between the trough 200R and the belt 204R, and the widthwise end of the belt 204R comes into contact with the trough 200R to generate a large frictional force there. This causes a problem that the running resistance of the belt 204R becomes large and the whole belt 204R cannot run smoothly, so that the transported object 206 cannot be satisfactorily conveyed.

[0012]

SUMMARY OF THE INVENTION The air levitation type conveyor belt of the present invention has been devised to solve such problems. According to the first aspect of the present invention, there is provided an air-floating type conveyor belt having a structure in which an upper cover rubber, a reinforcing core layer, and a lower cover rubber are laminated, which are arranged side by side at a high density in a belt width direction, in a belt longitudinal direction. The reinforcing core layer is constituted by a cord composed of extending warp yarns and low-density coarsely arranged weft yarns in the belt width direction to maintain the arrangement of the warp yarns in the belt longitudinal direction. .

According to a second aspect of the present invention, in the conveyor belt according to the first aspect, the cord has a weft smaller than the warp.

[0014]

According to the first aspect of the present invention, the cord is used as the reinforcing core layer of the air-floating belt. In the case of this cord, the reinforcing action is mainly performed by the warp, and the weft mainly functions to maintain the arrangement of the warp, and its arrangement is coarse in the longitudinal direction of the belt.

Therefore, in the case of the belt according to the first aspect, wherein such a cord is used as a reinforcing core layer, the upper cover rubber and the lower cover rubber are vertically connected to each other through the coarse cord of the cord. Even if the thickness of the rubber is different from that of the lower cover rubber, the contraction after vulcanization differs between the upper cover rubber and the lower cover rubber during belt manufacturing as in the conventional belt, causing the entire belt to deform. This does not cause the belt to shrink uniformly as a whole, thereby suppressing the warpage as shown in FIG. 9.

In addition, a belt using such a cord has low lateral rigidity, and therefore can be deformed to follow the trough shape. Therefore, when such a belt is floated on the trough by air blowing, the belt floats evenly from the trough over the entire width direction, and both ends in the width direction contact the trough as in the conventional case, and friction occurs there. Force and running resistance can be prevented. That is, an air layer can be appropriately formed between the trough and the belt on both the carrier side and the return side, and the belt can run smoothly based on the air levitation force.

In the present invention, the thickness of the weft in the cord can be made thinner than the warp (claim 2). In this case, the transverse rigidity of the cord becomes weaker and the belt becomes It becomes possible to follow and deform the trough more favorably.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 3 shows the cross-sectional configuration of each of the carrier side and the return side of the air-floating belt conveyor.
In the figure, 10 is a trough, 10C is a carrier side, and 10C is a trough.
R indicates the return side.

As shown in FIG. 1, the trough 10 has a semi-circular or semi-elliptical cross section on both the carrier side 10C and the return side 10R. An air outlet 12 is formed at the bottom, and air from a blower (not shown) is blown upward from the air outlet 12. Reference numeral 14 denotes a belt placed on the trough 10, and 14C and 14R indicate a carrier side and a return side, respectively.

FIGS. 1 and 2 show the structure of the belt 14. In these figures, 16 is the upper cover rubber, 1
8 is a reinforcing core layer, 20 is a lower cover rubber, and the belt 1
Reference numeral 4 denotes a cross-sectional structure in which these are vertically stacked. Reference numeral 22 denotes ear rubber.

The reinforcing core layer 18 is formed by laminating a plurality of cords 24 (three in this example). This cord 24 is composed of warp yarns 24a arranged at a high density in the belt width direction and weft yarns 24b roughly arranged in the belt longitudinal direction to maintain the arrangement of the warp yarns 24a.

In this example, the blind code 24 is specifically configured as shown in the following equation (1).

[0023]

(Equation 1)

That is, the warp yarn 24a is formed by twisting two yarns of 1500 denier and further twisting three sets of them to form one thick warp yarn 24a of a total of 6 yarns, which is 5 cm in length.
25 are arranged per length. On the other hand, the weft 24b is 5
It consists of a single 00 denier yarn, which is arranged 5 per 5 cm length. The material of the warp is polyester.

The warp yarns 24a have a function of imparting a large strength (tensile strength) in the longitudinal direction of the belt, while the weft yarns 24b have a function of connecting the warp yarns 24a to each other in the belt width direction to maintain a predetermined arrangement. Things. In this example, the belt 14 has a total thickness of 12.7 mm and a belt width of 1600 mm. The thickness of the upper cover rubber 16 is 5 mm, and the thickness of the lower cover rubber 20 is 2 mm.

In the case of the belt 14 of this embodiment, the upper cover rubber 1
6 and the lower cover rubber 20 are connected to each other vertically through the coarse cord of the cord 24, and accordingly, the upper cover rubber 1
Even if the thickness of the lower cover rubber 20 differs from that of the lower cover rubber 20, the entire belt 14 can be uniformly contracted after vulcanization during belt production, and at that time, large warpage deformation as shown in FIG. 9 does not occur. In addition, the belt 14 using the cord 24 having the above-described configuration has a small lateral rigidity, so that it can be deformed to follow the trough shape.

Therefore, such a belt 14 is
When the belt 14 is lifted by air blowing above, the belt 14 floats well from the trough 10 over the entire width direction on both the carrier side and the return side, and both ends in the width direction come into contact with the trough 10 as in the related art. There is no such thing as producing a large frictional force and running resistance. That is, an air layer can be appropriately formed between the trough 10 and the belt 14 on both the carrier side and the return side, and therefore, the belt 14 can run smoothly based on the air levitation force.

FIG. 4 shows the belt 14 of this embodiment in the trough 1
The figure shows the measurement results of the follow-up deformation performance with respect to the shape of the trough 10 when the trough is placed on zero. FIG. 5 shows the measurement results when a conventional belt 204, that is, a plain woven canvas as a reinforcing core layer, specifically, a belt 204 using a plain woven canvas having the structure and configuration represented by the following formula (2) is used. Is shown.

[0029]

(Equation 2)

As shown in the above formula (2), the belt 204 used in this case has a warp 216a formed by twisting six 1000 denier yarns into one warp 216a. I have. On the other hand, the weft yarn 216b is formed by twisting two 1260 denier yarns to form a weft yarn 216b, and 19 of them are arranged per 5 cm length.

As is clear from the above, it can be seen that the belt 14 of the present embodiment deforms well following the trough shape.

On the other hand, Table 1 shows the results obtained by measuring the floating amount of the belt 14 by actually blowing air from the air blowing holes 12 and calculating the friction coefficient when the belt 14 runs in the longitudinal direction. . Here, the belt width is 1000 mm and 1
A measurement test was performed on two types of belts of 600 mm. In the measurement of the floating amount, as shown in FIG. 6, the floating amount at the center in the belt width direction was measured.

[0033]

[Table 1]

As shown in the results of Table 1, in the case of the belt 14 of this embodiment, the floating amount at the central portion in the belt width direction is smaller than that of the conventional belt 204, and the trough 10 and the belt 14
It can be seen that the air blown up between is well evacuated. That is, in the case of the belt 14 of this example, the conventional belt 20
It can be seen that air levitation is better than that of No. 4.

Although the embodiment of the present invention has been described in detail, this is merely an example. For example, in the present invention, the cord 24 can have various other configurations other than the above example, and the present invention provides a pipe-shaped trough having a circular or elliptical cross section on both the carrier side and the return side. In addition, the present invention can be configured in various modified forms without departing from the gist of the present invention, such as being applicable to an air-floating belt conveyor having troughs of various shapes.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the configuration of an air-floating type conveyor belt according to an embodiment of the present invention.

FIG. 2 is a diagram showing a horizontal sectional structure and a vertical sectional structure of the same belt.

FIG. 3 is a diagram showing a configuration of an air-floating belt conveyor using the belts of FIGS. 1 and 2;

FIG. 4 is a diagram showing a measurement result of a follow-up deformation performance of the belt according to the example with respect to a trough.

FIG. 5 is a diagram showing a measurement result of a follow-up deformation performance with respect to a trough of a conventional belt.

FIG. 6 is an explanatory diagram of a method of an air levitation test.

FIG. 7 is an explanatory view of a conventionally known air levitation type belt conveyor.

FIG. 8 is a diagram showing a conventionally used belt and a deformed shape after vulcanization.

FIG. 9 is an explanatory diagram of a malfunction of the belt in FIG. 8;

[Explanation of symbols]

 14 belt 16 upper cover rubber 18 reinforcing core layer 20 lower cover rubber 24 cord 24a warp 24b weft

Claims (2)

[Claims] 1. An air-floating conveyor belt having a structure in which an upper cover rubber, a reinforcing core layer, and a lower cover rubber are laminated, a warp yarn extending in the belt longitudinal direction, which is arranged at a high density in the belt width direction, and An air-floating conveyor belt comprising a reinforcing cord layer composed of a cord composed of a weft thread extending in a belt width direction, which is coarsely arranged at a low density in a longitudinal direction of the belt so as to maintain an arrangement of warp threads. . 2. The conveyor belt according to claim 1, wherein the cord has a weft thread thinner than the warp thread.