JP2000062927A - Air floating type carrying belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surpress increase of the traveling resistance due to adhesion of a rubber charged with tackiness to the inner surface of a tube when a belt lug part is worn by forming an intermediate part of a surface and a back surface cover rubber layers in the belt cross direction of a flexible rubber, and forming belt lug parts of a relatively hard rubber. SOLUTION: An air floating carrying belt for floating a material to be carried for carrying with the air supplied forms a bottom part of a tube in the condition that the cross section is elastically deformed into a curve in a tube is provided with a surface cover rubber layer 1, a back cover rubber layer 2, a core 3 arranged between both the cover rubber layers 1, 2. The core 3 has canvas layers 3a, 3b as two plies of cloth layers. In this case, belt lug parts in both ends in the belt cross direction of both the cover rubber layers 1, 2 are formed of hard rubber parts 4, 4 made of the rubber harder than the intermediate part in the belt cross direction. With this structure, even in the case where the belt lug parts are worn, generation of malfunction that the rubber is charged with tackiness and adhered to the inner surface of the tube can be eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conveyor belt which conveys an object to be conveyed while floating while being floated by the air supplied from the bottom of the tube in a state where the tube is elastically deformed in a curved cross section and arranged. , Especially regarding measures for reducing running resistance.

[0002]

2. Description of the Related Art For example, as described in Japanese Unexamined Patent Publication No. 4-317911, each span is elastically deformed to have a curved cross section and is arranged in a double inner and outer circular pipe. It is known that an air-floating type conveyor belt conveys an object to be conveyed by being driven by the air supplied from the bottom while levitating, and in this conveyor belt, the entire surface of the belt is the inner surface of the pipe during traveling. Ideally, it should float completely without contact.

However, in practice, both end portions in the belt width direction (hereinafter referred to as belt ears) are in contact with the inner surface of the pipe over substantially the entire length of the circular pipe, and this contact causes a large running resistance to the belt. Therefore, a large amount of power is required to drive the belt.

The transport belt will now be described in detail with reference to FIG. 8. One of the belts in the belt thickness direction (vertical direction in the figure) (upper surface in the figure) is shown.
And a back cover rubber layer b arranged on the other surface in the thickness direction of the belt (a lower surface in the same figure).
And between these cover rubber layers a and b,
A core body c in which a plurality of ply (generally two ply) canvas layers d, d, ... Are laminated.

In the past, the above-mentioned belt ears e,
As a measure for suppressing the running resistance due to e, a rubber having a low hardness (soft hardness) is used for the cover rubber layers a and b to reduce the bending rigidity of the belt in the belt width direction, thereby giving flexibility to the inner surface of the pipe. This reduces the contact force of the belt ears e with respect to the inner surface of the tube.

[0006]

However, the soft rubber used for the cover rubber layers a and b generally has poor abrasion resistance. Moreover, this rubber sometimes becomes sticky when worn and adheres to the inner surface of the pipe. For these reasons, the conventional conveyor belt in which the cover rubber layers a and b are made of soft rubber has a drawback that the running resistance is rather increased.

The present invention has been made in view of the above points, and its main purpose is to levitate by air supplied from the bottom of the pipe in a state where the pipe is elastically deformed in a curved shape in section and arranged. In an air-floating conveyor belt that travels while transporting an object to be conveyed, by improving its structure, running resistance caused by wear of the belt ears without impairing the flexibility of the belt with respect to the inner surface of the pipe It is to be able to avoid the increase of.

[0008]

In order to achieve the above-mentioned object, in the present invention, a rubber having a soft hardness is used in the belt width direction intermediate portion of the cover rubber layer as in the conventional case to the inner surface of the pipe. While maintaining flexibility, a high hardness rubber having good wear resistance and low tackiness was used for the belt ears to reduce running resistance.

Specifically, in the invention of claim 1, a front cover rubber layer disposed on one surface in the belt thickness direction and a back cover rubber layer disposed on the other surface in the belt thickness direction. And a core body disposed between both cover rubber layers, and in a state where the core body is elastically deformed in a curved cross section in the pipe and is placed while being floated by the air supplied from the bottom of the pipe, It is premised on an air levitation type conveyor belt that conveys a conveyed object.

The intermediate portions in the belt width direction of the both cover rubber layers are made of soft hardness (low hardness) rubber, while
Belt ears (both ends of both cover rubber layers in the belt width direction)
Is made of rubber having hardness higher than that of the intermediate portion in the belt width direction.

In the above structure, when the air levitation type conveyor belt is placed in the tube of the air levitation type conveying device, the belt is elastically deformed along the inner surface of the tube in a curved shape in cross section. In this state, when the belt is driven while being supplied with air from the bottom, the belt floats over the entire width and travels.

At this time, since the intermediate portions in the belt width direction of the both cover rubber layers are made of soft rubber, the contact force of the belt ears to the inner surface of the pipe can be suppressed as in the conventional case. On the other hand, since the belt ear portion is made of rubber having a hardness higher than that of the belt width direction middle portion, the belt ear portion is less likely to be worn as compared with the case of soft hardness rubber, and even if worn, it is sticky and has an inside pipe. It rarely adheres to the surface. Therefore,
To that extent, the increase in running resistance due to the belt ears can be suppressed.

According to the second aspect of the present invention, the air levitation type which conveys an object to be transported while floating while being floated by the air supplied from the bottom of the pipe in a state where the pipe is elastically deformed in a curved shape in section and arranged. In the conveyor belt, the coefficient of friction between the belt ears and the inner surface of the tube is set to be smaller than that in the intermediate portion in the belt width direction.

In the above-mentioned structure, when the traveling force is generated by the contact force of the belt ears with respect to the inner surface of the tube as the conveyor belt runs while floating in the tube, the contact between the belt ears and the inner surface of the tube is reduced. Since the friction coefficient is smaller than the friction coefficient between the belt width direction middle portion and the pipe inner surface, the friction coefficient between the belt ear portion and the pipe inner surface is about the same as the friction coefficient between the belt width direction middle portion and the pipe inner surface. The running resistance due to the belt ears is reduced as compared to a conventional case.

According to a third aspect of the present invention, in the second aspect of the present invention, a cloth layer is laminated on the contact portion of the belt ear portion with the inner surface of the tube.

In the above-mentioned structure, when the conveyor belt floats in the pipe and travels while the belt ears come into contact with the inner surface of the pipe, the cloth layer is formed at the contact portion of the belt ears with the inner surface of the pipe. It is laminated. The surface of this cloth layer generally has a smaller coefficient of friction with the inner surface of the pipe than the surface of the cover rubber layer. Therefore, the operation of the invention of claim 2 can be carried out specifically and properly.

According to a fourth aspect of the invention, in the same air levitation type conveyor belt as in the case of the second aspect of the invention, the surface of the side contacting the inner surface of the pipe is laminated with a stretchable cloth layer. I shall.

In the above structure, when the conveyor belt floats in the tube of the air levitation type conveyor and travels, the contact force of the belt ears against the inner surface of the tube causes a running resistance, so that the side contacting the inner surface of the tube. Since the cloth layer is laminated on the surface of, the coefficient of friction with the inner surface of the pipe is smaller than that in the conventional case where the surface is the rubber of the cover rubber layer. Moreover, since the cloth layer has elasticity, unlike the case where such cloth layers having no elasticity are laminated,
The situation of impairing the flexibility of the belt body is avoided.

According to a fifth aspect of the present invention, in the above-mentioned fourth aspect of the present invention, the cloth material of the cloth layer is made of highly abrasion resistant fiber.

In the above structure, when the cloth layer on the surface of the belt body comes into contact with the inner surface of the tube, the cloth material of the cloth layer is made of fibers having high abrasion resistance (eg, nylon, polyester, aramid, etc.). Therefore, the above cloth material is
The abrasion resistance of the conveyor belt itself is improved as compared with the case where the fibers do not have high abrasion resistance.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. (Embodiment 1) FIG. 1 schematically shows the structure of an air levitation type conveyor belt A according to a first embodiment of the present invention. In the state where it is elastically deformed and arranged in a curved shape in a circular pipe,
It is used to convey an object to be conveyed by being driven while being floated by the air supplied from the bottom of the circular pipe.

The conveyor belt A has a front cover rubber layer 1 disposed on one surface (upper surface in FIG. 1) in the belt thickness direction (vertical direction in FIG. 1) and the other surface in the belt thickness direction (upper surface). It comprises a back cover rubber layer 2 disposed on the lower surface of the figure and a core body 3 disposed between the cover rubber layers 1 and 2 over substantially the entire width of the belt.

Both of the cover rubber layers 1 and 2 are made of rubber having a soft hardness used for a general air floating type conveyor belt. On the other hand, the core body 3 is formed by laminating a plurality of ply (here, two plies) cloth layers 3a, 3a as cloth layers.

In the present embodiment, the belt ears located at both ends of the cover rubber layers 1 and 2 in the belt width direction have a hardness higher than that of the intermediate portions of the cover rubber layers 1 and 2 in the belt width direction. The high hardness rubber portions 4 and 4 are made of rubber.

Next, the operation of the air levitation type conveyor belt A configured as described above will be described. When the conveyor belt A is placed in the circular tube of the air levitation type conveying device, the belt A elastically deforms along the inner surface of the circular tube in a curved shape in cross section. When the vehicle is driven while being supplied with air from the bottom of the circular tube in this state, the belt A conveys the object to be conveyed on the belt A while floating over the entire width direction.

At this time, since the intermediate portions in the belt width direction of both the cover rubber layers 1 and 2 of the conveyor belt A are made of rubber having the same soft hardness as in the conventional case, the contact force of the belt ears with respect to the inner surface of the pipe. Can be suppressed as in the conventional case. On the other hand, since the belt ears are the high hardness rubber portions 4 and 4 made of rubber having a hardness higher than the belt width direction intermediate portions of the both cover rubber layers 1 and 2, as compared with the case of the soft hardness rubber, It is hard to wear, and even if it wears, it is unlikely to be sticky and adhere to the inner surface of the pipe. Therefore, the increase in running resistance due to the belt ears can be suppressed accordingly.

Therefore, according to this embodiment, in the air levitation type conveyor belt A, both the front and back cover rubber layers 1 and 2 are provided.
While the belt width direction middle part of is made of soft rubber,
Since the belt ears are made of the high hardness rubber layers 4 and 4 made of rubber having a hardness higher than that of the belt width direction middle part, when the running resistance of the belt ears is reduced by the flexibility of the belt with respect to the inner surface of the pipe. In addition, it is possible to suppress an increase in running resistance due to the rubber of the belt ears becoming sticky when attached to the inner surface of the tube.

(Embodiment 2) FIG. 2 schematically shows an air levitation type conveyor belt A according to Embodiment 2 of the present invention. The same parts as those in the first embodiment are designated by the same reference numerals.

In the present embodiment, at the contact portion of the belt ear portion with the inner surface of the tube, the canvas layers 5 and 5 as the cloth layers are laminated, which allows the belt ear portion to contact with the inner surface of the tube. The coefficient of friction is set to be smaller than the coefficient of friction between the belt width direction intermediate portion and the pipe inner surface.

Specifically, the canvas layers 5 are laminated on the belt ears of the front and back cover rubber layers 1 and 2, respectively. Further, each of the above-mentioned canvas layers 5 is formed by dipping the canvas material with RFL liquid. Since the other parts are the same as those in the first embodiment, the description thereof will be omitted.

Next, the operation of the air levitation type conveyor belt A constructed as described above will be described. When traveling resistance is generated by the contact force of the belt ears with respect to the inner surface of the tube as the conveyor belt A floats and travels in the circular tube of the air levitation type conveying device, the contact portion of the belt ears with the inner surface of the tube The canvas layers 5 and 5 are laminated, and the surface of the canvas layer 5 has a smaller friction coefficient with the inner surface of the pipe than the surfaces of the cover rubber layers 1 and 2. Therefore, the running resistance due to the belt ears is reduced as compared with the conventional case in which the coefficient of friction between the belt ears and the inner surface of the tube is about the same as the coefficient of friction between the belt width direction intermediate part and the inner surface of the tube.

Therefore, according to this embodiment, by stacking the canvas layers 5 and 5 on the belt ears of the air floating type conveyor belt A, the coefficient of friction between the belt ears and the inner surface of the pipe is
Since it is set to be smaller than the friction coefficient between the belt width direction middle portion and the pipe inner surface, the running resistance of the belt ear portion can be reduced without reducing the contact force of the belt ear portion with respect to the pipe inner surface. . As a result, for example, when the pipe diameter of the conveying device is small, there is a limit to the reduction of the running resistance only by reducing the contact force of the belt ears, and the contact force of the belt ears is reduced by lowering the rigidity of the belt. In this case, it is possible to reduce the running resistance of the air levitation type conveyor belt A even when it is not possible to carelessly reduce the rigidity of the belt A in order to secure the required strength and the life of the belt A. become.

-Experimental Example- Next, description will be given of an experiment conducted by making a sample of the conveyor belt in the case of the above-described second embodiment and examining the running resistance coefficient with respect to the inner surface of the pipe.

As the above-mentioned sample, as shown schematically in FIG. 3, with respect to the width dimension of 400 mm, the canvas layers 5, 5 (the canvas material is RFL are formed on the belt cover both ears of the back cover rubber layer 2).
30 pieces in the width direction of the belt)
A laminate having a length of 3 m laminated over a range of mm was produced. Further, as a comparative example, a sample (see FIG. 8) without the above-mentioned canvas layer on the belt ears was prepared. The configuration of each sample is also shown in Table 1 below.

[0035]

[Table 1]

In this experiment, the running resistance evaluation machine shown in FIGS. 4 and 5 was used. This one has a length equivalent to a circular tube of 3
The mounting part 10 has a semicircular cross section of m, and an air supply device 11 that supplies air to the mounting part 10. The air supply device 11 includes a main pipe 12 connected to a blower (not shown).
Are connected to a plurality of branch pipes 13, and the ends of the branch pipes 13 are connected to the center of the bottom of the mounting portion 10 at equal pitches in the longitudinal direction of the mounting portion 10. . Further, at the base of the main pipe 12, an orifice 14 for controlling the flow rate of air supplied from the blower is provided. Then, each sample S is placed on the placing part 10, and the pulling force when the sample S moves in the same direction by pulling the sample S in one direction (right direction in FIG. 4) while supplying a constant air. F was measured, and this tensile force F was divided by the weight of the sample S to obtain the running resistance coefficient.

The above results are as shown in Table 1 above, and it can be seen that the running resistance coefficient of the invention example is about half that of the comparative example.

Further, an experiment conducted for measuring the friction coefficient of the canvas layer 5 itself will be described. The outline of this experiment is as shown in FIG.
Each sample S is placed on and the weight is 1.543k on it.
The weight 21 of g is placed, each sample S is pulled in one direction (leftward in the figure), and the tensile force F when the sample S starts moving is measured. It was calculated by dividing the own weight of each sample S by the added value. For comparison, two types of rubber sheets having hardnesses H _S = 40 ° and H _S = 60 ° were prepared as samples of the cover rubber layer, and the same experiment was performed.

The above results are also shown in Table 2 below.

[0040]

[Table 2]

From Table 2 above, the coefficient of friction of the canvas layer 5 is:
It can be seen that it is about half that of each rubber sheet.

Therefore, from the above two experiments, it can be understood that the running resistance of the entire belt can be reduced by about half by only reducing the friction coefficient between the belt ear portion and the inner surface of the tube.

(Embodiment 3) FIG. 2 schematically shows an air levitation type conveyor belt A according to Embodiment 2 of the present invention. The same parts as those in the first embodiment are designated by the same reference numerals.

In this embodiment, the front and back cover rubber layers 1, 2 are
An elastic cloth layer 6 as a cloth layer having a modulus lower than that of the rubber of the cover rubber layers 1 and 2 is laminated on the surface of the belt main body including the core body 3 that is in contact with the inner surface of the tube.

Specifically, the elastic cloth layer 6 is laminated on all the surfaces of the front cover rubber layer 1 and the back cover rubber layer 2. The cloth material of the elastic cloth layer 6 is made of abrasion resistant fiber such as nylon, polyester and aramid.

Next, the operation of the air levitation type conveyor belt A constructed as described above will be explained. When traveling resistance is generated between the belt A and the inner surface of the tube as the conveyor belt A runs while floating in the circular tube of the air levitation type conveying device, the side of the belt body that comes into contact with the inner surface of the tube is Since the elastic cloth layer 6 is laminated on the surface, the coefficient of friction with the inner surface of the pipe is smaller than in the conventional case where the surface is the rubber of the cover rubber layer. Moreover, since the elastic cloth layer 6 has elasticity, it is said that the flexibility of the belt main body is impaired as compared with the case where such cloth layers having no elasticity and higher modulus than rubber are laminated. The situation is avoided.

Therefore, according to the present embodiment, in the air floating type conveyor belt A, the elastic cloth layer 6 having elasticity is laminated on the contact surface with the inner surface of the tube of the belt main body, so that the entire belt is The running resistance of the entire belt contact surface with respect to the inner surface of the tube can be reduced without impairing the flexibility.

[0048]

As described above, according to the invention of claim 1, the core body is arranged between the front and back cover rubber layers,
An air levitation type conveyor belt which conveys an object to be conveyed while levitating by the air supplied from the tube bottom in a state of being elastically deformed and arranged in a pipe in a curved shape, wherein both cover rubber layer belts are provided. While the middle part in the width direction is made of soft rubber, the belt ears of both cover rubber layers are made of rubber having a hardness higher than that of the middle part in the belt width direction. Can be suppressed from increasing in running resistance due to sticking to the inner surface of the pipe.

According to the second aspect of the present invention, also in the air levitation type conveyor belt, the coefficient of friction between the belt ears and the inner surface of the tube is set to be smaller than the coefficient of friction between the belt width direction intermediate portion and the inner surface of the tube. As a result, the running resistance of the belt ears can be reduced without reducing the contact force of the belt ears with the inner surface of the tube.

According to the invention of claim 3, since the cloth layer is laminated on the portion of the belt ear portion which comes into contact with the inner surface of the tube,
The effect of the invention of claim 2 can be concretely and properly obtained.

According to the fourth aspect of the present invention, also in the air levitation type conveyor belt, since the cloth layer having elasticity is laminated on the contact surface with the inner surface of the tube, the flexibility of the entire belt is impaired. In addition, the running resistance of the entire belt contact surface with respect to the inner surface of the pipe can be reduced.

In the invention of claim 5, since the cloth material of the cloth layer is made of high abrasion resistant fiber, the cloth material of claim 4 is obtained.
In addition to the effect of the invention described above, the abrasion resistance of the belt itself can be improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view schematically showing an air floating type conveyor belt according to a first embodiment of the present invention.

FIG. 2 is a view corresponding to FIG. 1 schematically showing an air floating type transport belt according to a second embodiment of the present invention.

FIG. 3 is a view corresponding to FIG. 1 showing an air levitation type transport belt of an invention example used in an experiment for examining a running resistance coefficient.

FIG. 4 is a side view schematically showing a running resistance evaluation machine.

5 is a sectional view taken along line VV of FIG.

FIG. 6 is a side view schematically showing the procedure for measuring the coefficient of friction of a dip canvas.

FIG. 7 is a view equivalent to FIG. 1 schematically showing an air floating type conveyor belt according to a third embodiment of the present invention.

FIG. 8 is a view corresponding to FIG. 1 and schematically showing a conventional air levitation type conveyor belt.

[Explanation of symbols] 1 Front cover rubber layer 2 Back cover rubber layer 3 mind and body 3a canvas layer 4 High hardness rubber part 5 Canvas layer (cloth layer) 6 Stretchable cloth layer (cloth layer) A Air levitating conveyor belt

Claims (5)

[Claims] 1. A front cover rubber layer disposed on one surface in the belt thickness direction, a back cover rubber layer disposed on the other surface in the belt thickness direction, and disposed between both cover rubber layers. In an air levitation type conveyor belt for transporting an object to be conveyed while floating while being floated by the air supplied from the bottom of the tube, the belt being provided with The belt width direction intermediate portions of both cover rubber layers are made of low hardness rubber, while the belt width direction both ends of both cover rubber layers are made of rubber having higher hardness than the belt width direction intermediate portion. A characteristic air floating conveyor belt. 2. An air levitation type conveyor belt which conveys an object to be conveyed while floating while being floated by the air supplied from the bottom of the tube in a state where the belt is elastically deformed in a curved shape in section and arranged. The friction coefficient between the inner surface of the pipe at both ends in the width direction is
An air levitation type conveyor belt characterized by being set to be smaller than a friction coefficient between a belt width direction middle portion and a pipe inner surface. 3. The air levitation type conveyor belt according to claim 2, wherein cloth layers are laminated at contact portions of both ends in the belt width direction with the inner surface of the pipe. 4. An air levitation type conveyor belt which conveys an object to be conveyed while floating while being floated by air supplied from the bottom of the tube in a state where the tube is elastically deformed in a curved cross section and arranged. An air levitation type conveyor belt, characterized in that a cloth layer having elasticity is laminated on a surface of the tube which is in contact with the inner surface of the tube. 5. The air levitation type conveyor belt according to claim 4, wherein the cloth material of the cloth layer is made of highly abrasion resistant fiber.