JPH0986630A - Extending/contracting belt and belt conveyer device using this extending/contracting belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a conveyed object from sinking in a width direction central part of an extending/contracting belt while preventing early generation of a crack, by providing a silicon rubber layer consisting of low modulus silicon rubber in at least one side surface of a tension member, as the extending/ contracting belt extensible/contractible in a belt width direction. SOLUTION: An extending/contracting belt 2 has a tension member 3 extensible about 100% or more in a width direction. In the tension member 3, knitted cloth consisting of fabric or rubber knitting or at least a woof in a belt width direction is constituted by a polyurethane fiber rich in extension/contraction, in an upper side (conveying surface side) of the tension member 3, a silicon rubber layer 5 consisting of low modulus silicon rubber is bonded through a bonding agent layer 4. In the extending/contracting belt 2, even when modulus of the tension member 3 is increased or an initial extension rate of the belt 2 is increased, the silicon rubber layer 5 follows to extend, so as to prevent an early crack of the silicon rubber layer 5, further a conveyed object can be suppressed from sinking in a width direction central part of the belt 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technical field relating to a stretch belt and a belt conveyor device using the stretch belt.

[0002]

2. Description of the Related Art Generally, in a baking line in which bread is automatically formed from the dough, when the dough is weighed and arranged on a conveyor belt and then passed through an oven device, in a state before passing through the oven device, While the bread dough cannot be placed close to each other, it is required to reduce the bread dough arrangement interval in the oven in order to reduce the running cost and the like. Due to the demand for widening or narrowing the interval of the bread dough during the transportation, a stretchable belt that can expand and contract in the width direction is used as a conveyor belt in a transportation line for bread, confectionery and the like.

In addition to this, a stretchable belt is also used as a conveyor belt for carrying fruits and vegetables in a fruit sorter, for example.

As such an elastic belt, conventionally,
For example, as shown in Japanese Patent Publication No. 2-29564,
A knitted fabric made of knitting or rubber knitting, or a tensile body made of a woven fabric in which at least wefts in the belt width direction are made of highly stretchable polyurethane fiber, and a low tension member provided on at least one side surface of the tensile body. One having a resin layer made of a modulus resin has been proposed.

[0005]

However, when the expandable belt is used as a conveyor belt in this way, the expandability of the expandable belt in the width direction is large. It is unavoidable that the belt sinks in the widthwise center of the belt. If a sensor such as a photoelectric tube is used to detect the presence or absence of the conveyed product, the conveyed product may not be accurately detected due to the sinking of the conveyed product, which may cause a malfunction.

Further, when the width of the belt is expanded, the entire belt is in a tension state, but when the width of the belt is reduced, the central portion in the width direction of the belt is slackened, and it is difficult to stably convey the conveyed object. There is a risk that In addition, at this time, there is a problem that spherical or columnar conveyed products are displaced or come into contact with each other by gathering in the central portion of the belt.

Therefore, in order to avoid such slackening of the central portion of the elastic belt and sinking of the conveyed product, it is conceivable to attach a support plate to the back side of the belt, which support plate corresponds to the expansion and contraction of the belt. Therefore, it is necessary to change the dimensions, which not only complicates the mechanism but also causes problems such as increased abrasion of the back surface of the belt and movement of the conveyed object due to movement resistance.

In addition, the modulus of the tension body should be increased,
Alternatively, it is conceivable to increase the stress of the belt by increasing the initial elongation rate of the belt, but in that case, the elongation rate of the resin layer becomes large and the belt cracks in a relatively short time (no external stimulation Therefore, the cracks that occur naturally occur, and the practicality becomes low.

The present invention has been made in view of the above points, and an object of the present invention is to improve the modulus of the tensile member or to improve the initial belt by improving the structure of the elastic belt. While increasing the growth rate,
The purpose of this is to prevent the occurrence of early cracks and prevent slackening of the central portion of the stretchable belt and sinking of the conveyed object without requiring a special belt support mechanism.

[0010]

In order to achieve the above object, in the present invention, the resin layer attached to the tensile member in the elastic belt is changed to the silicone rubber layer.

Specifically, in the invention of claim 1, a tensile member made of a knitted fabric made of knitting or rubber knitting, or a woven fabric made of polyurethane fiber having at least weft in the belt width direction is highly stretchable. As a stretchable belt that has a stretchable belt width direction, a silicon rubber layer made of low modulus silicon rubber is provided on at least one side surface of the tensile body.

With this structure, since the silicone rubber layer provided on at least one side surface of the tensile body is made of low modulus silicone rubber, even if the modulus of the tensile body is increased or the initial elongation of the belt is increased, The silicone rubber layer will follow and expand, and early cracking of the silicone rubber layer can be prevented. In other words, by increasing the modulus of this tensile body or increasing the initial elongation rate of the belt, it is possible to suppress the subsidence of the conveyed object and realize a smooth conveyance of the conveyed object without requiring a special belt support mechanism. can do.

According to the second aspect of the invention, a silicone rubber layer is provided on one side surface of the tensile body. Further, in the invention of claim 3, a silicone rubber layer is provided on both side surfaces of the tensile body.

In the invention of claim 4, the silicon rubber has a tensile strength of 100 to 120 kgf / cm ² ,
Elongation is 700-900%, hardness is Hs20-30
Shall have the following characteristics. As a result, the desired characteristics of silicone rubber for the silicone rubber layer are obtained.

According to a fifth aspect of the present invention, the object is a belt conveyor device provided with the elastic belt having the above-mentioned structure. That is, the belt conveyor device according to the present invention includes:
The elastic belt of the invention of 3 or 4, and a plurality of one ends each of which is locked to a side edge portion in the width direction of the elastic belt at a predetermined interval in the belt length direction and has an engaging portion at the other end. An engaging member and a guide member that is arranged on each of the left and right sides of the elastic belt along the belt traveling direction, and the engaging portion of each engaging member is movably engaged in the belt traveling direction. It is characterized by that. Also in this invention, it is possible to obtain the same operational effect as that of the invention of claim 1.

According to a sixth aspect of the invention, in the belt conveyor device according to the fifth aspect of the invention, a locking hole for locking the engaging member is formed through the side edge of the elastic belt in the belt thickness direction. A cylindrical eyelet member is inserted and fixed in the locking hole.

The engaging member is fixed to the connecting member arranged over the guide member and the belt side edge portion and the belt side end portion of the connecting portion at the base end portion, and the elastic belt side. The eyelet member is provided with a shaft portion rotatably inserted into the eyelet member in the locking hole of the edge portion, and a fastening member fastened to the tip end portion of the shaft portion. A resin washer made of a soft resin is provided between the connecting portion and the fastening member that face the portion.

Further, in the invention of claim 7, at least one of the pair of resin washers has a cylindrical portion inserted into the eyelet member.

According to the sixth or seventh aspect of the invention, since the resin washer made of the soft resin is disposed between each end of the eyelet member on the belt side and the connecting portion and the fastening member, the eyelet member is connected to the eyelet member. The resin washer can avoid direct contact between the portion and the fastening member. Therefore, even if the modulus of the tensile body is increased or the initial elongation of the belt is increased to increase the stress of the belt,
By repeating the expansion and contraction of the belt, the eyelet member is less likely to be displaced from the connecting portion and the fastening member, and wear due to the displacement can be suppressed. In particular, when the cylindrical portion is provided on at least one of the resin washers as in the seventh aspect of the invention, the cylindrical portion can also prevent wear between the eyelet member and the shaft portion.

[0020]

2 and 3 show the essential parts of an automatic bread-baking line for bread according to an embodiment of the present invention, in which 1 is a belt conveyor device, which is a telescopic belt 2 capable of expanding and contracting in the belt width direction. And a plurality of pulleys 9 to 12 around which the elastic belt 2 is wound. The upper span of the elastic belt 2 is horizontally stretched between a pair of pulleys 9 and 10 to form a conveyance section, and a dough forming machine for measuring the bread dough W and dropping it onto the belt 2 above the starting end side thereof. 14 and an oven device 15 for baking the bread dough W while the belt 2 is passing therethrough is installed in the middle of the belt traveling direction. Then, the upper span (conveying section) of the elastic belt 2 changes from a stretched state to a contracted state from the start end side to the end side, and the belt width is wide at the conveyor start end side corresponding to the bread dough forming machine 14. So that the belt width is narrowed in the range from the entry position of the oven device 15 to the end of the conveyor, the degree of stretching in the width direction is reduced and the belt is contracted. The intervals in the belt width direction of the plurality of bread doughs W, W, ... As placed articles are automatically changed in the belt advancing direction (conveying direction).

As shown in the enlarged detail of FIG. 1, the elastic belt 2 has a tensile member 3 which can be stretched by 100% or more in the belt width direction. The tensile member 3 is made of knitting or rubber knitting. The knitted fabric, or at least the weft in the belt width direction is made of polyurethane fiber having high elasticity. A silicon rubber layer 5 made of low modulus silicon rubber is adhered to the upper side (conveying surface side) of the tensile body 3 via an adhesive layer 4. As shown in FIG. 6, not only the upper side of the tensile body 3 but also the lower side (the side opposite to the conveying surface) of the tensile body 3 may be bonded with the similar silicone rubber layer 5 via the adhesive layer 4.

The silicone rubber forming the silicone rubber layer 5 has a tensile strength of 100 to 120 kgf / cm ² , an elongation of 700 to 900%, and a hardness of Hs 20 to.
Those having the characteristic of 30 are preferred.

Referring again to FIGS. 2 and 3, a pair of guide rails 1 having a substantially U-shaped cross section, which are open to the lower side and extend in the belt traveling direction, are provided on the left and right sides of the elastic belt 2.
7, 17 are provided as guide members. These two guide rails 17, 17 respectively attach the left and right side edge portions 2a, 2a of the elastic belt 2 to attachments 19, 19 ,.
The width of the bread dough is determined by, for example, the bread dough forming machine 14 of the upper span of the belt 2.
The range from the position of to the entry position of the oven device 15 is
Both guide rails 1 from the former position to the latter position
The interval between the guide rails 17 and 17 is constant from the entrance position to the end position of the oven device 15 so that the expansion belt 2 is extended. The degree is kept small.

Left and right side edges 2a, 2a of the elastic belt 2
Are engaged with the respective guide rails 17 through a plurality of metal attachments 19, 19, ... As engaging members. That is, as shown in enlarged detail in FIG. 5, the left and right side edges 2a, 2a of the elastic belt 2 are hardened so as not to expand and contract, and the attachments 19, 29 are attached to the respective side edges 2a.
A plurality of locking holes 6, 6 for locking the locking holes 19 are formed through the belt thickness direction at predetermined intervals in the belt length direction, and each locking hole 6 has a cylindrical shape. The metal eyelet member 7 is inserted and fixed. Each of the above attachments 19
Has a bifurcated arm-shaped connecting portion 20 arranged between the guide rail 17 and the side edge portion 2a of the belt 2, and the guide portion is provided at the base end portion of the connecting portion 20 on the guide rail 17 side. A guide roller 21 as an engaging portion that engages with the rail 17 is rotatably supported inside the guide rail 17. On the other hand, a pin 22 as a shaft portion extending in the direction orthogonal to the connecting portion 20 is integrally coupled and fixed to the base end portion of the distal end portion of the connecting portion 20, and the pin 22 is located at the side edge portion 2a of the elastic belt 2. Is rotatably inserted in the eyelet member 7 in each locking hole 6. A threaded portion 22a is formed at the tip of the pin 22, and a nut 23 as a fastening member is screwed and fastened to the threaded portion 22a via a metal washer 24.
Then, the upper surface side of the belt 2 of the eyelet member 7 (conveying surface side)
Side end portion 7a (upper end portion in FIG. 5) and the metal washer 24 on the nut 23 side facing the end portion 7a, and the end of the eyelet member 7 on the lower surface side of the belt 2 (opposite to the conveying surface). Resin washers 26 and 27 made of polyurethane resin are respectively interposed between the portion 7b and the connecting portion 20 facing the end portion 7b.

Therefore, in the above-described embodiment, when the elastic belt 2 travels between the pulleys 9 to 12, the pair of guide rails 17 and 17 is provided in the upper span conveying section.
The guide rollers 21 in each of the attachments 19, 19, ... Of both side edges 2a, 2a of the elastic belt 2 roll inside, whereby the elastic belt 2 is pulled in the belt width direction by both guide rails 17, 17. Drive in a closed state. That is, in the upper span (conveying portion) of the elastic belt 2, the belt width changes from the stretched state to the contracted state from the start end side to the end side, and the belt width becomes wider at the start end side portion corresponding to the bread dough forming machine 14. As described above, the width direction is narrowed, and the belt width is narrowed in the range from the entrance position of the oven device 15 to the terminal end portion, and the width direction is reduced in the width direction and contracted. As a result, the distance between the bread doughs W, W, ... Placed on the belt 2 in the belt width direction automatically changes in the belt advancing direction (conveying direction), and the bread dough forming machine 14
The space is wide when dropped from the
The interval becomes smaller when approaching.

In this case, the elastic belt 2 has the tensile member 3
A silicon rubber layer 5 is laminated on the upper side (conveying surface side). Since this silicon rubber layer 5 is made of low modulus silicon rubber, the modulus of the tensile member 3 is increased or the initial elongation rate of the belt 2 is increased. Even if it is increased, the silicone rubber layer 5 will follow and expand, and it is possible to prevent early cracking of the silicone rubber layer 5. In other words, the modulus of the tensile body 3 can be increased or the initial elongation rate of the belt 2 can be increased without causing early cracking of the silicone rubber layer 5, so that the bread dough W, W, ... It is possible to suppress the sinking of the bread dough at the central portion in the width direction of the bread dough, without the need for a special belt support mechanism.
It is possible to achieve smooth conveyance of.

In addition, in each of the attachments 19, the pin 22 at the tip of the connecting portion 20 is inserted into the eyelet member 7 in each locking hole 6 in the side edge portion 2a of the belt 2, and the nut at the tip of the pin 22 is inserted. 23 is screwed and fastened, and by fastening the nut 23, the eyelet member 7 of the side edge portion 2a of the belt 2 is fixed in a state of being sandwiched between the metal washer 24 and the tip portion of the connecting portion 20. . Therefore, when the end portions 7a and 7b of the metal eyelet member 7 are in direct metal contact with the metal washer 24 and the connecting portion 20, the modulus of the tensile member 3 is increased as described above or the initial state of the belt 2 is increased. When the extension rate is increased, the eyelet member 7 and the attachment 19 are likely to be displaced from each other. However, in this embodiment, both end portions 7a and 7b of the eyelet member 7 on the belt 2 side are provided.
Between the metal washer 24 (nut 23) and the connecting portion 20 and a resin washer 26 made of polyurethane resin,
Since 27 is interposed, direct contact between the eyelet member 7 and the metal washer 24 and the connecting portion 20 can be avoided by the resin washers 26 and 27, respectively. Even if the stress of the belt 2 is increased, the expansion and contraction of the belt 2 can be prevented. The eyelet member 7, the connecting portion 20, and the metal washer 24 (nut 2
It becomes difficult to cause a deviation from 3) and wear due to the deviation can be suppressed.

As shown in FIG. 7, one of the pair of resin washers 26, 27 (in the example shown in FIG. 7, the resin washer 26 on the nut 23 side is the resin washer on the connecting portion 20 side). 27) may be integrally formed with the cylindrical portion 26a inserted into the eyelet member 7. By doing so, wear between the eyelet member 7 and the pin 22 can also be prevented by the cylindrical portion 26a made of polyurethane resin. It should be noted that both resin washers 26 and 27 may be formed with similar cylindrical portions.

Further, the above embodiment is applied to the conveyor device of the automatic bread forming and baking line, but the present invention is applied to the case where the elastic belt is used in the conveyor line of the fruit sorter and other belt conveyor devices. Can also be applied to.

[0030]

EXAMPLES Next, concretely implemented examples will be described. The tensile body (trade name “MT-708 manufactured by Toray-Dupont-Matsumoto Textile, which is shown in the above-described embodiment,
4 ") has a 1 mm thick silicone rubber layer (silicon rubber manufactured by Shin-Etsu Chemical Co., Ltd .: trade name" KE-522 ") bonded to the elastic belt as an example of the present invention, and the silicone rubber layer is a silicone resin. Layer (Bayer Synthetic Silicone Silicon Resin: Product Name “Syroprene RTV-2K68
6 ”), and an expansion belt as a conventional example was produced. These mechanical properties are as shown in Table 1.

[0031]

[Table 1]

Using the above-mentioned two kinds of elastic belts, the initial expansion rate is relatively small 10% and relatively large 25%.
Then, it was mounted on the belt conveyor device. In this belt conveyor device, a maximum extension rate of 30% is reached while the belt travels 1200 mm, and a conveyed object having a weight of 500 g is placed at the central portion in the belt width direction at the center portion in the process of extending to the maximum extension rate. The amount of sinking was measured. In addition, the time until the occurrence of cracks and the time until the eyelet members were worn away were measured as the belt moved. The results are shown in Table 2 below.

[0033]

[Table 2]

As is clear from the results shown in Table 2,
By increasing the initial elongation rate of the belt to 25%, the sinking amount of the conveyed material can be reduced to 3 mm.

Further, in the example of the present invention, compared with the conventional example, both the time until the occurrence of cracks and the time until the abrasion of the eyelet members are significantly increased, and the initial elongation rate of the belt is raised to 25%. Therefore, it can be seen that the occurrence of early cracks and the wear of eyelet members can be effectively prevented.

[0036]

As described above, in the elastic belt of the first aspect of the invention or the belt conveyor device of the fifth aspect of the invention, at least one side surface of the tensile member that can expand and contract in the belt width direction has a low modulus silicone. A silicone rubber layer made of rubber was provided. In the invention of claim 2, the silicone rubber layer is provided on one side surface of the tensile body, and in the invention of claim 3, the silicone rubber layer is provided on both side surfaces of the tensile body. Therefore, according to these inventions, even if the modulus of the tensile member in the stretchable belt is increased or the initial elongation of the belt is increased, it is possible to prevent early cracking of the silicone rubber layer,
Therefore, it is possible to suppress the sinking of the transported object and realize the smooth transportation of the transported object without requiring a special belt support mechanism.

According to the invention of claim 4, the tensile strength of the silicone rubber is 100 to 120 kgf / cm ² , the elongation is 700 to 900%, and the hardness is Hs 20 to 30. The desired silicone rubber properties are obtained.

According to a sixth aspect of the invention, in the belt conveyor device according to the fifth aspect of the invention, the eyelet member is inserted and fixed in the locking hole of the side edge portion of the elastic belt, while the belt is engaged and guided by the guide member. The coupling member is provided at a connecting portion arranged over the guide member and the side edge portion of the belt, and is provided at the tip of the connecting portion, and is rotatable in the eyelet member in the locking hole at the side edge portion of the elastic belt. It is assumed that the shaft portion inserted and a fastening member fastened to the tip end portion of the shaft portion are provided, and resin washers made of a soft resin are respectively provided between both end portions of the eyelet member and the coupling portion and the fastening member. Intervening. Further, in the invention of claim 7, at least one of the pair of resin washers is provided with a cylindrical portion that is inserted into the eyelet member. According to these inventions, direct contact between the eyelet member and the connecting portion and the fastening member can be avoided by the resin washer, and the modulus of the tensile member can be increased or the initial elongation of the belt can be increased to increase the stress of the belt. Even if the belt is repeatedly stretched, the eyelet member and the connecting portion and the fastening member can be prevented from being displaced from each other, and wear due to the displacement can be prevented, so that the elastic belt can be stably conveyed for a long period of time. it can. Particularly, according to the invention of claim 7, wear between the eyelet member and the shaft portion can be prevented by the resin cylindrical portion.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main part of an elastic belt according to an embodiment of the present invention.

FIG. 2 is a schematic side view of a belt conveyor device.

FIG. 3 is a schematic plan view of a belt conveyor device.

FIG. 4 is a plan view showing a belt engagement mechanism.

FIG. 5 is a cross-sectional view showing an engagement structure with the belt side edge portion of the attachment.

FIG. 6 is a view corresponding to FIG. 1 showing another embodiment of the elastic belt.

FIG. 7 is a view corresponding to FIG. 5, showing another embodiment of the engagement structure with the belt side edge portion of the attachment.

[Explanation of symbols]

 1 Belt Conveyor Device 2 Telescopic Belt 3 Tensile Body 5 Silicon Rubber Layer 6 Locking Hole 7 Eyelet Member 17 Guide Rail (Guide Member) 19 Attachment (Engaging Member) 20 Connecting Part 21 Guide Roller (Engaging Part) 22 Pin ( Shaft part 23 Nut (fastening member) 24 Metal washer (fastening member) 26, 27 Resin washer W Bread dough (conveyed object)

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display area D03D 15/08 D03D 15/08

Claims (7)

[Claims] 1. A tensile body made of a knitted fabric made of knitting or rubber knitting, or a woven fabric made of polyurethane fiber having at least a weft in the width direction of the belt, which is highly stretchable, and is stretchable in the belt width direction. A stretchable belt, wherein a silicon rubber layer made of low modulus silicon rubber is provided on at least one side surface of the tensile body. 2. The stretchable belt according to claim 1, wherein a silicone rubber layer is provided on one side surface of the tensile body. 3. The stretchable belt according to claim 1, wherein a silicone rubber layer is provided on both side surfaces of the tensile body. 4. The stretchable belt according to claim 1, 2 or 3, wherein the silicone rubber has a tensile strength of 100 to 120 kgf / c.
m ^2, and the elongation is from 700 to 900%, elastic belt hardness and having a characteristic which is Hs20～30. 5. The elastic belt according to claim 1, 2, 3 or 4, wherein one end of each elastic belt is locked to a side edge portion in the width direction of the elastic belt at a predetermined interval in the belt length direction, A plurality of engaging members each having an engaging portion at the other end, and the engaging portions of the engaging members are arranged on the left and right sides of the elastic belt along the belt advancing direction. A belt conveyor device, comprising: a guide member engaged with the belt conveyor device. 6. The belt conveyor device according to claim 5, wherein a locking hole for locking the engaging member is formed through the side edge portion of the elastic belt in the belt thickness direction. A cylindrical eyelet member is inserted into and fixed to the connecting member, and the engaging member is fixed to the connecting portion arranged over the guide member and the belt side edge portion and the belt side end portion of the connecting portion at the base end portion. A shaft portion rotatably inserted into the eyelet member in the locking hole of the side edge portion of the elastic belt, and a fastening member fastened to the tip end portion of the shaft portion. A belt conveyor device characterized in that a resin washer made of a soft resin is provided between each end and a connecting member and a fastening member facing the end. 7. The belt conveyor device according to claim 6, wherein at least one of the pair of resin washers has a cylindrical portion inserted inside the eyelet member.