JP2002168304A - Joint racing pin for industrial, belt and endless industrial belt using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a racing pin hard to deform even under high tensile force and superior in anticorrosion, refracting fatigue resistance and heat resistance, and an industrial belt using the same. SOLUTION: The joint racing pin for the industrial belt to be inserted in common holes formed by mutually meshing loops provided at both ends of an ended industrial belt in the longitudinal direction to make the belt connected at its ends into an endless form comprises using a superelastic alloy having a 3% or more elastic region, whereby the joint racing pin is subjected to a martensitic transformation by external stress to cause a transformation in a larger distortion region than a ordinary elastic distortion and it is subjected to a reverse transformation resulting in almost all disappearance when the external stress is removed. The endless industrial belt involves using the racing pin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining lace pin for connecting an industrial belt and an endless industrial belt connected by inserting a joining lace pin.

[0002]

2. Description of the Related Art Conventionally, industrial belts have been used in various fields. For example, it is used in a wide range such as a filter cloth for a dewatering machine for general sewerage, domestic wastewater, industrial wastewater, etc., a press fabric or a dryer canvas used in a papermaking process, a nonwoven fabric manufacturing belt, and a conveyor belt. These industrial belts are often used under harsh conditions,
The filter cloth and the like for the dehydrator must have a structure capable of withstanding high pressure, and the dryer canvas for papermaking and the belt for nonwoven fabric manufacturing must have a structure capable of withstanding high temperatures. Endless belts are usually used for industrial belts. In the process of manufacturing an endless belt, endless belts are connected endlessly using various methods, and there are many well-known techniques for connecting methods. 2. Description of the Related Art A method of forming an endless industrial belt mainly by forming loops at both ends thereof and inserting a lacing pin into a common hole formed by meshing the loops to form an endless shape is widely used. However, it is difficult to make the connecting part exactly the same as the other part of the belt connected endlessly from the endless belt in any connection method, and even in the connection using the loop and the racing pin In particular, the influence on the connecting loop and the racing pin is large, and the loop may protrude and wear due to a tension balance or the like, and may have an adverse effect such as internal wear on the joining loop due to fatigue or bending of the racing pin. Since industrial belts are used under high tension and pressure, the joining loops facing each other have a pulling force in the opposite direction, and the straight lacing pins that pass through the loops are tightly engaged with each other. Irregularities are formed. And when pulling out the racing pin from the common hole, it is very difficult to pull out because the uneven shape is given, it may damage the inside of the joining loop, and if you use the belt as it is after replacing the racing pin In some cases, the belt life was shortened. For example, when only the ends of the racing pins are broken, or when the twisted wires of the racing pins are unwound, there is a case where only the racing pins are replaced and used without changing the belt body. Also, in replacing the belt after use, rather than cutting the belt, a method of pulling out the racing pin, making it ended, connecting a new belt to the end, rotating the belt, placing the new belt in the device, and replacing it Although it is easy, take out the racing pin deformed by the influence of tension and pressure from the common hole of the connection loop,
The task of replacing with a new racing pin was very difficult.

[0003]

The endless industrial belt is connected to an endless industrial belt by inserting a joining lacing pin into a common hole formed by engaging loops formed at both ends of the industrial belt. The racing pin is hardly deformed even under high tension, has corrosion resistance, refraction fatigue resistance, heat resistance, and prevents the racing pin from coming off the end of the belt connecting portion, and An object of the present invention is to provide a racing pin capable of easily removing a belt and an endless industrial belt using the same.

[0004]

According to the present invention, there is provided a method for connecting a belt by inserting a loop provided at both ends in the longitudinal direction of an end-shaped industrial belt into a common hole formed by meshing the belts. In a joining lacing pin for forming an endless shape, the joining lacing pin undergoes martensitic transformation due to external stress, causing transformation of a large strain region exceeding normal elastic strain, and reverse transformation when external stress is removed. 1. A pin formed of a superelastic alloy having an elastic region of 3% or more in which transformation is almost eliminated, and a joining pin for an industrial belt 2. A superelastic alloy having a wide elastic region is used. 2. The racing pin for joining an industrial belt according to item 1, which is a titanium-containing alloy, a superelastic alloy having an elastic region of 3% or more and losing elasticity by heating. 3. The lacing pin for joining an industrial belt according to item 1 or 2, wherein the lacing pin for joining a belt is formed of a single wire of a superelastic alloy. 4. The lacing pin for joining an industrial belt according to item 1 or 2, which is a stranded wire formed by twisting wires 5. The lacing pin for joining an industrial belt is made of a superelastic alloy wire and another metal. 5. The lacing pin for joining an industrial belt according to item 1 or 2, which is a stranded wire having an elastic region of 3% or more formed by twisting wires 6. The loop is formed by engaging loops at both ends. 7. The endless industrial belt according to any one of items 1 to 5, wherein the lacing pin for joining according to any one of items 1 to 5 is inserted into the common hole to form an endless shape. , Common Endless industrial belt, characterized in that the vicinity of the end of the joining racing pin inserted into the hole is bent and heated to prevent the pin from coming off.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The joining racing pin of the present invention is formed of a superelastic alloy having a wide elastic range, and is locally bent, deformed, crushed, etc. due to rubber elasticity while being a metal. Because of its excellent strength, it can be easily inserted into the joining loop and pulled out of the loop after use, and has excellent workability. Metal is usually deformed by a load when an external force is applied, and if it exceeds the elastic limit, so-called plastic deformation occurs, and it is normal that the metal does not return to its original shape even when the external force is removed. The strain due to elastic deformation is at most about 1%. However, a superelastic alloy undergoes a martensitic transformation due to external stress, that is, a change in crystal structure, causing deformation in a large strain region exceeding a normal elastic strain and ranging from several percent to 10%, and removing the external stress. Then, reverse transformation occurs and this deformation almost or completely disappears. Practically used are Ni-Ti alloys and some alloys of copper-based and iron-based alloys, and Ni-Ti alloys are superior in terms of shape recovery characteristics, repetition characteristics, and the like.

[0006] As a material of the joining racing pin of the present invention, a titanium alloy mainly composed of titanium and nickel is used. This titanium alloy is a metal material having excellent strength, refraction fatigue resistance and corrosion resistance, low thermal conductivity and low thermal expansion coefficient, and having a wide elastic range. Copper, iron, zinc, instead of nickel
Although an alloy using aluminum or the like can be used, a titanium alloy composed of titanium and nickel is particularly preferable because it has excellent characteristics and can be used for industrial belts for any purpose. The superelastic alloy used in the present invention undergoes martensitic transformation due to the above-mentioned external stress, causing deformation in a large strain region exceeding normal elastic strain. It is a metal that has the property of disappearing.
The strain due to elastic deformation of a normal metal material such as stainless steel is at most 1%, but a superelastic alloy has an elastic region that is several times larger than that of a metal material such as stainless steel. Due to such a property, even a racing pin of an industrial belt used by applying a high tension keeps a substantially linear shape without giving an uneven shape, so it is easy to pull out from the joining loop and is excellent as a racing pin. Show the effect.

Although a metal wire having an elastic area of less than 3% has a wider elastic area than stainless steel or the like, a racing pin deformed irregularly due to a high tension applied to the belt is hard to return to a linear shape, and the lace of an industrial belt is difficult. It is not very suitable as a pin. The joining lacing pins are used to connect a belt provided with a loop to the end of an end-shaped industrial belt to form an endless belt. The industrial belt is connected endlessly by inserting loops provided at both ends in the vertical direction into common holes formed by meshing with each other, and is used on an actual machine together with the belt.

[0008] The shape of the joining racing pin may be any shape as long as it can be inserted into the common hole formed by the loop, and the diameter is large enough to withstand a certain amount of tension and pressure.
What is necessary is just to select suitably according to the thickness of a belt and the magnitude | size of a loop. Also, a single wire of a superelastic alloy having a wide elastic range, a stranded wire obtained by twisting several superelastic alloy wires, or a superelastic alloy wire and another metal such as stainless steel are used for the joining racing pin. You may use the twisted wire which twisted the wire. A single wire of a superelastic alloy can be suitably used under severe corrosion and wear conditions, and a stranded wire can be suitably used under conditions where refraction fatigue resistance and bending resistance are required. The stranded wire made by twisting super-elastic alloy wire and other metal wire such as stainless steel is easy to join with the leading wire made of metal such as stainless steel, has the advantage of having a certain strength and reducing material cost. There is. It is preferable to use various joining lacing pins using such a superelastic alloy as appropriate according to the purpose and use conditions. Further, the length of the racing pin is preferably slightly longer than the length in the width direction of the belt, and a method is used in which the end of the racing pin is subjected to a slip-prevention process so as not to slip off during use. For the slip-off prevention processing, bend the end of the racing pin inserted into the common hole of the belt, weld a fastener larger than the loop provided at the end of the belt at the end, or insert the pipe into the short end of the pipe There is a method of working as a fastener by caulking, and processing so that the racing pin does not come off.

One of the features of the joining lacing pin of the present invention is that it can be easily bent. The joining lacing pin is a superelastic alloy, but loses its elasticity by heating. By heating the part, the bent shape can be easily fixed, and the work-out prevention processing can be easily performed. The method of preventing the racing pin from slipping out is not limited to these, and the one provided with the fastener is firmly fixed, and is a process that does not slip off, so that it does not extremely deteriorate metallically Other methods may be used as long as the method is used.

[0010] As a method of inserting the joining racing pin into the common hole of the loop, a leading wire is joined to the tip of the racing pin, and the racing pin is pushed in through the common hole by utilizing the bending resistance of the leading wire. Can be easily inserted into the hole. As a joining method of the racing pin and the leading wire, there is a method of joining the connecting portion by brazing, welding, or the like, a method of caulking the end of the racing pin and the leading wire with a sleeve or the like, and the like. Either method can be easily joined, and a stranded wire obtained by twisting a metal wire such as stainless steel and a superelastic alloy has an advantage that welding is particularly easy. The industrial belt is not particularly limited in the material such as woven fabric made of synthetic resin wire or metal wire or the shape of the belt, and the loop provided at the end in the length direction of the belt is not particularly limited. For example, a method of providing a loop with a thread constituting a belt, a method of separately attaching a spiral loop, a method of attaching a hook made of a toothed stainless steel to a belt, and a method of sewing a tape having a loop onto a belt. There is a method of providing a loop by performing such a method, but other methods may be used as appropriate. Any structure may be used as long as loops are formed at both ends of the endless belt and a common hole is formed by meshing the loops with each other, and a racing pin is inserted into the common hole and connected endlessly. In addition, for industrial belts woven with yarns made of synthetic resin, etc., the ends of the loops are reinforced by resin-processing the belt ends near the loops to prevent mesh openings in the fabric and the loops from coming off. In the case of a belt used in a particularly severe environment, it is effective to process the vicinity of the loop portion with a resin.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on embodiments with reference to the drawings. FIG. 1 shows a connecting portion of an industrial belt. Loops 2 are provided at both ends of an end-shaped industrial belt 1, and the joining lacing pins 4 are inserted into and connected to a common hole formed by meshing them with each other, and the ends of the pins are bent. It is a connecting portion of the endless belt on which the slip-off preventing portion 5 is formed. FIG. 2 is a cross-sectional view of a joining portion connected by a joining loop 2 and a racing pin 4.
The drawing shows that the joining lacing pins 4 are inserted into the common holes 3 formed by the facing joining loops 2. FIG. 3 is a part of a cross-sectional view in which a joining loop is disposed at an end of a belt serving as a connecting portion of an industrial belt. 6 can be strongly attached by biting the metal clipper 6 at the end of the belt serving as the connecting portion with the teeth 7 of the clipper. This clipper can be easily attached simply by biting it with teeth, and is suitable for a woven fabric or the like woven by a multifilament having a large wire diameter.

Next, using a joining lacing pin having a wide elastic range according to an embodiment of the present invention and a conventional joining lacing pin made of stainless steel as a comparative example, resistance to refraction fatigue, corrosion, abrasion, and resistance was obtained. The effect of the present invention will be described by showing a comparative test on the deformability. Example 1 A loop was formed by attaching a clipper formed of stainless steel to both ends of a belt woven using a polyester monofilament having a wire diameter of 0.50 mm as a warp and 0.90 mm as a weft at longitudinal ends. Both ends of the belt were butted, and a racing pin made of a single wire of a Ni-Ti alloy having a diameter of 1 mm was inserted into a common hole formed by meshing the loop to form an endless belt. Example 2 An endless belt was made in the same manner as in Example 1 except that the diameter of the racing pin was 1.6 mm. Example 3 An endless belt was made in the same manner as in Example 1 except that a racing pin was a stranded wire obtained by twisting seven Ni-Ti alloy wires having a diameter of 0.5 mm. Comparative Example 1 An endless belt was made in the same manner as in Example 1 except that a stainless wire having a diameter of 1 mm was used as a racing pin. Comparative Example 2 An endless belt was made in the same manner as in Example 1 except that a stainless steel wire having a diameter of 1.6 mm was used as a racing pin.

Comparative Test Folding fatigue test Table 1 gives each wire rod a 90 ° swing angle on each side.
In this figure, the refractive fatigue resistance of the example and the comparative example was observed by the number of times until cutting, and the fatigue fatigue resistance of a single wire and a twisted wire of a titanium alloy and a stainless steel wire was compared.

[0014]

[Table 1]

In the examples, the number of times of cutting is larger than that of the comparative example, and in the case of stranded wires, the stranded wires of the examples are far superior in refraction fatigue resistance. It is preferable to use a stranded wire of a Ni-Ti alloy as in the embodiment when used under severe conditions where emphasis is placed on.

2. Corrosion resistance, abrasion resistance, deformation resistance test 1) Corrosion resistance, abrasion resistance Used as a racing pin of sludge press belt for sewage treatment plant containing salt iron for one month and compare corrosion resistance and abrasion resistance did. The comparative test was performed using the belts of Example 1 and Comparative Example 1 using a single wire having a wire diameter of 1 mm. As a result, one month later, Comparative Example 1 showed corrosion on the entire racing pin, and abrasion was observed on the inside of the loop and on the racing pin, whereas the racing pin of Example 1 was still worn after one month. No corrosion or wear was observed. 2) Comparison of deformation resistance and ease of pulling out of the racing pin Example 1 has a straight shape without any deformation even after one month of use, so that the racing pin can be easily formed through the common hole of the connecting portion of the industrial belt. Could be pulled out. On the other hand, in Comparative Example 1, irregularities were deformed due to penetration into the joining loop, and further corrosion occurred, so that it was difficult to pull out. As a result of the above comparative test, the racing pin of the present example showed superior effects on the refraction fatigue resistance, corrosion resistance, abrasion resistance, and deformation resistance as compared with the conventional racing pin. In particular, since the racing pin is unlikely to be deformed even by a high tension applied to the industrial belt, the racing pin is straight and can be easily taken out from the common hole of the connecting portion of the industrial belt. In addition, it can be seen that the bonding pin of the Ni—Ti alloy is excellent in refraction fatigue resistance, corrosion resistance, and deformation resistance.

[0017]

As described above, the joining pin of the super-elastic body having a wide elastic range for joining the industrial belt of the present invention is hardly deformed even by a large tension. It is easy to remove the racing pin from the common hole, and it can be easily bent by heating to prevent the racing pin from coming off, and it has excellent corrosion resistance, refraction fatigue resistance, and heat resistance. An endless industrial belt connected by using a racing pin has a long life and is excellent in workability.

[Brief description of the drawings]

FIG. 1 is a connecting portion of an industrial belt connected by a joining loop and a racing pin.

FIG. 2 is a sectional view of a connecting portion of an industrial belt connected by a joining loop and a racing pin.

FIG. 3 is a cross-sectional view in which a joining loop is disposed at an end of a belt serving as a connecting portion of an industrial belt.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Industrial belt 2 Joining loop 3 Common hole formed by engaging the joining loop 4 Joining lace pin 5 Bending part 6 Metal clipper 7 Clipper teeth

Continued on the front page (72) Inventor Senri Ito 2220 Daimaru, Inagi-shi, Tokyo F-term in Nippon Filcon Corporation Tokyo Office (reference) 3F024 AA01 AA04 AA07 AA11 AA19

Claims (7)

[Claims] 1. A joining lacing pin for connecting an endless industrial belt to an endless shape by inserting loops provided at both ends in the length direction of the industrial belt into a common hole formed by meshing the belts. The joining lacing pin undergoes martensitic transformation due to external stress, resulting in transformation of a large strain region exceeding normal elastic strain, and when external stress is removed, reverse transformation occurs and transformation almost disappears. A racing pin for joining an industrial belt, wherein the pin is formed of a superelastic alloy having an elastic region. 2. A superelastic alloy having a wide elastic region is an alloy containing titanium, having an elastic region of 3% or more,
The lacing pin for joining industrial belts according to claim 1, wherein the lacing pin is a superelastic alloy that loses elasticity when heated. 3. The lacing pin for joining an industrial belt according to claim 1, wherein the lacing pin for joining an industrial belt is formed of a single line of a superelastic alloy. 4. The lacing pin for joining an industrial belt is a stranded wire formed by twisting superelastic alloy wires.
A lacing pin for joining industrial belts according to claim 1 or 2. 5. A lacing pin for joining an industrial belt formed by twisting a superelastic alloy wire and another metal wire.
The lacing pin for joining an industrial belt according to claim 1 or 2, which is a stranded wire having an elastic region of at least%. 6. An endless industrial belt having an endless shape by inserting the joining lacing pin according to claim 1 into a common hole formed by engaging loops at both ends. . 7. The industrial belt according to claim 6, wherein the pin is prevented from coming off by bending and heating the vicinity of the end of the joining lacing pin inserted into the common hole. Endless industrial belt.