JPH0141721Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to a conveyor belt, and more particularly, to a conveyor belt including a pair of toothed belts that run while sandwiching an object to be conveyed on opposite back surfaces of the belts.

(Prior Art) The work of pulling and feeding out conveyed objects such as electric wire cables, round bars, pipes, and square timbers is performed by pulling the conveyed objects 100 in pairs from above and below or from the left and right, as shown in FIGS. 5 and 6. This is carried out by applying pressure in a sandwich-like manner using rollers 101 and flat belts 102 and utilizing the frictional force generated at that time. However, in the roller or flat belt system, the speeds of rollers or flat belts that are arranged opposite to each other are inevitably different, which causes friction scratches on the conveyed object 100. Moreover, in the roller method, each pair of rollers is independent from the other pair of rollers, so continuous pressure cannot be applied to the conveyed object 100, and the rollers must be arranged in all directions. In the flat belt system, the flat belt tends to stretch over time, and therefore maintenance must be performed frequently and the maintenance work is complicated. In order to solve this problem, a method using a toothed belt has been proposed. In this toothed belt system, since the toothed belts facing each other run in synchronization, the surface speed of both belts is constant, and no friction damage is caused to the conveyed object. However, in this method, as shown in Figure 7,
Pressure pulley 104 that engages with toothed belt 103
The pulley tooth top portion 105 strongly presses the belt tooth bottom portion 106. As a result, the core wire 107, which is disposed in close proximity to the belt tooth bottom 106, is severely damaged, and longitudinal cracks also occur in the belt body. The reinforcing member 108, such as nylon canvas, near the belt tooth bottom 106 is also severely damaged. As a result, the life of the toothed belt 103 is extremely short. Further, in this system, the toothed belt 103 tends to meander or slip sideways during running, which causes heat generation and belt wear. Furthermore, since the toothed belt 103 meshes with the pressure pulley 104 while making a polygonal fisting motion, the belt tooth tips 109 come into contact with the pulley tooth bottoms 110 as if hitting them, generating an impact sound. As the meshing between the two occurs at high speed, this impact noise becomes louder and becomes unbearable.

(Purpose of the invention) The purpose of the invention is to protect the core wire of the belt and prevent longitudinal tearing of the belt by dispersing and reducing the pressure from the pressure pulley, thereby creating a conveyor belt with excellent durability. Our goal is to provide the following. Another object of the present invention is to provide a conveyor belt that can maintain uniform clamping pressure on objects to be transported at all times. Still another object of the present invention is to provide a conveyor belt that does not meander or skid. Still another object of the present invention is to provide a conveyor belt that can reduce impact noise caused by contact with pulleys.

(Structure of the invention) A toothed belt is a synchronous transmission belt in which the belt teeth and the grooves of the pulley mesh accurately and smoothly without slipping. Therefore, it is possible to exhibit high conduction efficiency with extremely low backlash.
High-speed operation is also possible. Space and energy savings can also be achieved through compactness and weight reduction. On the other hand, a flat belt is a belt that transmits power by the frictional force generated between it and a pulley. Therefore, since the pressing force from the pressure pulley can be distributed over the entire contact surface of the belt, the pressing force per unit area of the belt is reduced. Therefore, the wear resistance of the belt is improved.

By combining the synchronous transmission function of a toothed belt and the frictional transmission function of a flat belt, this invention exhibits a synergistic function and effect that goes beyond a mere collection of functions and effects that both belts originally have. It was completed based on the new knowledge of the inventor of Uruto. Therefore, the conveyor belt of the present invention is a conveyor belt equipped with a pair of toothed belts that run while sandwiching the conveyed object in a sandwich-like manner on the opposite back surfaces of the belts, and includes at least one pressure-resistant belt auxiliary member. are arranged along the belt longitudinal direction so that the height from the bottom surface of the belt teeth is equal to or lower than the height of the belt teeth, thereby achieving the above object.

(Example) The present invention will be described below with reference to embodiments.

As shown in FIGS. 1 to 3, the conveyor belt 1 of the present invention consists of a pair of toothed belts 1 facing each other.
1, and pulls or sends out the conveyed object 2 while holding it under pressure in a sandwich shape on the back side of each belt. For example, at least one groove 111 is provided on the back surface 112 of each toothed belt 11 along the belt longitudinal direction. At least one pressure-resistant belt auxiliary material 13 is continuously arranged on each belt tooth 12 of each belt 11 so as to cross each belt tooth 12 along the belt longitudinal direction. The height H of the belt auxiliary material 13 from the belt tooth bottom surface 121 is set equal to the height h of the belt teeth 12. The belt auxiliary material 13 is arranged at least directly below the groove 111.

At least a portion of the conveyed object 2 can fit into the groove 111 . As a result, the contact area between the belt 11 and the conveyed object 2 increases, and the pressing force applied to the belt 11 by the pressure pulley 3 per unit area can be reduced by that amount. This also prevents the conveyed object 2 from meandering. It is more preferable not to provide this groove 111 when the shape of the conveyed object 2 changes complicatedly.

By arranging the pressure-resistant belt auxiliary material 13 on the belt 11 and providing a groove in the pressure pulley 3 into which the belt auxiliary material 13 can fit, the contact area of the pressure pulley 3 with the belt 11 is increased. Therefore, the pressing force of the pressure pulley 3 on the belt 11 is dispersed, and the contact pressure per unit contact area of the belt 11 is reduced. As a result, the core wire 14, which is embedded in the toothed belt 11 and is made of, for example, a glass fiber cord or an aromatic polyamide fiber (for example, Kevlar trade name) cord, receives excessive pressing force from the pressure pulley 3. As a result, longitudinal tear damage to the belt 11 is prevented. Also,
Uniform clamping pressure can be maintained at all times on the conveyed object 2 clamped by the grooves 111. Therefore, the surface speed of the belt 11 is constant, and unnecessary frictional scratches are not caused on the conveyed object 2. Furthermore, since the contact pressure between the tooth tips 120 of the belt 11 and the tooth bottoms 30 of the pressure pulley 3 is relaxed, impact noise due to the polygonal behavior of the toothed belt 11 is reduced. Since the belt auxiliary material 13 fits into the groove of the pressure pulley 3, the belt 11 does not meander or slide sideways during running. Therefore, unnecessary friction with the pressure pulley 3 does not occur, and heat generation and wear of the belt 11 are significantly reduced. There is no need to provide a flange as with conventional pulleys. The belt auxiliary material 13 is
The height H from the bottom surface 121 of the belt tooth is equal to the height h of the belt tooth 12, or as shown in FIGS. 4a and 4b, the height h of the belt tooth 12 is
set lower. Figure 4b shows belt auxiliary material 1
3 is a toothed belt 11 provided between belt teeth 12 in the belt longitudinal direction. When the height H of the belt auxiliary material 13 is lower than the height h of the belt teeth 12, it is set to 50% or more of the height h of the belt teeth 12. 50
If it is less than %, the belt auxiliary material 13 cannot perform its original function. When the height H of the belt auxiliary material 13 is higher than the belt tooth height h, the belt thickness becomes relatively large, and the pressing force from the pressure pulley 3 is absorbed by the belt auxiliary material 13. Therefore,
Sufficient pressing force is not transmitted to the transported object 2. The flexibility of the belt 11 is also impaired. Belt auxiliary material 13
When the belt width is sufficiently large, a plurality of can be provided within the belt width. Particularly, when the object 2 to be transported is flat, the clamping force of the object 2 to be transported can be maintained uniformly. At this time, the total base width W of the belt auxiliary material 13 is the belt tooth 1
2 and the pressure pulley 3,
30% of belt width to maintain reliable conveyance
Set within 90% range. If it exceeds 90%, the area that makes up the belt teeth becomes extremely small.
The object to be transported 2 cannot be transported accurately. If it is less than 30%, the belt auxiliary material 13 cannot perform its original function. The shape of the belt auxiliary material 13 is a shape that has sufficient deformation resistance against the pressing force of the pressure pulley 3, for example, a shape having a substantially rectangular cross-sectional shape in the width direction. Its top surface is horizontal. The material of the belt auxiliary material 13 is required to have high elasticity and excellent abrasion resistance in order to reduce the flexibility of the belt 11 and the impact on the belt 11. Examples include synthetic rubbers such as chloroprene rubber or styrene-butadiene rubber, or synthetic resins such as polyurethane. It is also preferable to cover at least a portion of the surface of the belt auxiliary material 13 with a reinforcing layer that is stretchable and has excellent abrasion resistance. As this reinforcing layer, for example, a woven or knitted fabric of polyamide or polyester fibers such as nylon or Kepler, or a nonwoven fabric of polyamide or polyester is appropriately selected.

The shape of the belt auxiliary material 13 is achieved, for example, by carving recesses in the belt teeth 12 of a toothed belt manufactured in advance and pressing the belt auxiliary material 13 onto the belt teeth 12 by heating. It is also possible to form it by.

In order to increase the frictional force generated between the toothed belt 11 and the conveyed object 2 and increase the conveying force, the toothed belt 11 used in the present invention is preferably made of rubber having a large friction coefficient and whose friction coefficient does not change over time. Consists of. Examples of such rubber materials include chloroprene rubber, styrene, butane diene rubber, and nitrile-butadiene rubber. The thickness of the rubber layer constituting the back surface of the belt is appropriately set depending on the load applied thereto. The rubber layer of each belt 11 includes at least one layer, for example,
A reinforcing member 15 such as nylon canvas may be embedded as appropriate. By arranging such members 15 in a layered manner, the pressure applied to the belt core wire 14 due to pressure from the pressure pulley 3 is dispersed and reduced, so that the core wire 1
4 damage can be minimized. the result,
Vertical tear damage to the belt 11 due to pressing force can be prevented. The reinforcing member layer 15 to be buried does not need to cover the entire width of the belt;
It should be at least directly below.

There are no particular restrictions on the shape, pitch, etc. of the belt teeth 12, and they are appropriately set depending on the load applied thereto. Therefore, as the belt teeth 12,
In addition to round teeth, trapezoidal teeth or curved teeth with curved tooth sides and tips may be used.

Although the main purpose of the conveyor belt 1 of the present invention is to clamp and convey an object 2 to be conveyed, it can also be applied to a self-propelled caterpillar belt for a robot or the like or a conveyor belt for conveying heavy objects.

(Effects of the invention) As described above, the conveyor belt of the present invention increases the contact area with the pressure pulley by providing the pressure-resistant belt auxiliary material on the belt teeth, and the contact area from the pressure pulley to the belt is increased accordingly. Pressure force per contact area can be reduced. As a result, the pressure on the belt core wire is dispersed, and the durability of the belt is significantly improved. Vertical tearing of the belt body is also prevented. Further, since a uniform pressing force is always maintained on the object to be transported, the object can be transported accurately without causing unnecessary friction damage to the object. Impact noise caused by contact between the belt and pulley is also reduced. This belt auxiliary material further restricts the running direction of the belt, thereby preventing meandering or sideways slipping of the belt. As a result, belt abrasion or heat generation due to abrasion is reduced, and the durability of the belt is further improved.

[Brief explanation of drawings]

FIGS. 1 and 2 are a perspective view and a front sectional view of essential parts, respectively, showing an embodiment of the conveyor belt of the present invention, and FIG. 3 is a partial sectional view in the belt width direction showing an embodiment of the conveyor belt of the present invention. , FIGS. 4a and 4b are perspective views of main parts showing other embodiments of the conveyor belt of the present invention, and FIGS. 5 and 6 are respectively
The figures are a perspective view and a front view of the main parts of a conventional tensioning or feeding device using a roller type and a flat belt type, respectively, and Fig. 7 is a front sectional view of the main part of a tensioning or feeding device using a conventional toothed belt type. It is. 1...Conveyor belt, 2,100...To be transported,
3,104...Pressure pulley, 11,103...Toothed belt, 12...Belt teeth, 13...Pressure-resistant belt auxiliary material, 14,107...Belt core wire, 15,108
... Reinforcement member, 30, 110 ... Pulley tooth bottom, 10
DESCRIPTION OF SYMBOLS 1... Roller, 102... Flat belt, 105... Pulley tooth tip, 106... Belt tooth bottom, 111... Groove, 112... Belt back surface, 120... Belt tooth tip, 121... Belt tooth bottom surface.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In a conveyor belt equipped with a pair of toothed belts that run while sandwiching an object to be conveyed in a sandwich-like manner between the back surfaces of the belts facing each other, at least one pressure-resistant belt auxiliary material is attached to the conveyor belt. A conveyor belt arranged along the belt longitudinal direction so that the height from the bottom surface of the belt teeth is equal to or lower than the height of the belt teeth. 2. The conveyor belt according to claim 1, wherein the belt auxiliary material is continuously arranged along the longitudinal direction of the belt. 3. The conveyor belt according to claim 1, wherein at least one groove in the belt longitudinal direction is provided on the back surface of the belt, into which at least a portion of the conveyed object can fit. 4. The conveyor belt according to claim 3, wherein the belt auxiliary material is provided at least directly below the groove. 5. The conveyor belt according to claim 1, wherein the height of the belt auxiliary material is 50% or more of the height of the belt teeth. 6. The conveyor belt according to claim 1, wherein the belt auxiliary material has a substantially rectangular cross-sectional shape and a horizontal top surface. 7. The conveyor belt according to claim 1, wherein the total base width of each of the belt auxiliary materials is within 30% to 90% of the belt width. 8. The conveyor belt according to claim 1, wherein the belt auxiliary material is made of elastic and abrasion-resistant synthetic rubber or synthetic resin. 9. The conveyor belt according to claim 8, wherein at least a portion of the surface of the belt auxiliary material is covered with a stretchable and wear-resistant reinforcing layer. 10. The conveyor belt according to claim 9, wherein the reinforcing layer is a woven or knitted fabric of polyamide or polyester fibers, or a nonwoven fabric of polyamide or polyester. 11. The conveyor belt according to claim 1, wherein the back surface of the belt is made of rubber having a large coefficient of friction and little change over time in the coefficient of friction. 12. The conveyor belt according to claim 11, wherein at least one reinforcing member is embedded in the rubber layer in parallel to the back surface of the belt. 13. The conveyor belt according to claim 3 or 12, wherein the reinforcing member is buried at least directly below the groove.