Rubber v belt for raising machine and production process thereof

Abstract

The present application relates to the field of rubber production, in particular to a special rubber V belt for raising machine and a production process thereof. The present application increases the contact surface of the belt and the pulley, improves the stress area of the V belt, and improves the wear resistance of the V belt by optimizing the V belt angle; the position of the skeleton wire is optimized, the neutral layer position of the V belt is adjusted, the bending deformation amplitude of the compression layer is reduced, and the bending fatigue life of the V belt is improved; and the silicon carbide heat conductor is a material with high thermal conductivity, the thermal conductivity of natural rubber is 0.15-0.21 W / (m.K), which is a poor conductor of heat, and the running temperature of the belt is reduced by 10 DEG C after adding the silicon carbide heat conductor, and the service life is improved by 40%.

Description

Technical Field

[0001] This invention relates to the field of rubber production, specifically to a rubber V-belt for a napping machine and its production process. Background Technology

[0002] Belt drives are an important form of mechanical transmission, operating on two principles: friction drives and meshing drives. V-belt drives belong to friction drives, relying on the application of appropriate tension to the V-belt to generate friction between the belt and pulleys for transmission. Ordinary cloth-covered V-belts consist of a skeleton cord, compression rubber, stretching rubber, cushioning rubber, and an outer fabric covering. Rubber V-belts have a simple structure, provide smooth transmission, and are widely used in various mechanical transmission fields.

[0003] A raising machine is a finishing device used to process fabrics by raising them. Raising involves using a raising machine to pull the ends of the fabric fibers out of the yarn, causing the fabric surface to be evenly covered with a layer of nap. The raising rollers are driven by rubber V-belts, and multiple raising rollers are connected in series by the belt to achieve the rotation of the raising rollers.

[0004] Currently, most manufacturers of napping machines use ordinary C-type V-belts, which have the following drawbacks: Compared to traditional V-belt drive systems, napping machine pulley systems have a larger number of driven pulleys, and each driven pulley forms a smaller wrap angle with the V-belt. This results in insufficient contact between the V-belt working surface and the pulley working surfaces, causing uneven belt stress, rapid belt wear, and a short service life. Additionally, the presence of a reverse pressure roller on each side of the drive pulley causes significant compression and bending deformation of the belt rubber, leading to high internal friction heat generation, rapid thermal aging, and a short service life. Summary of the Invention

[0005] This invention aims to provide a rubber V-belt specifically for napping machines and its manufacturing process, the specific solution of which is as follows:

[0006] A rubber V-belt for a napping machine includes two compressed rubber layers, with a reinforcing cord between the two compressed rubber layers. Each compressed rubber layer is covered with a fabric layer. The compressed rubber layers contain the following components by weight: 60-80 parts natural rubber; 20-40 parts butadiene rubber; 20 parts silicon carbide thermal conductive agent; 3-6 parts activator; 30-60 parts reinforcing carbon black; 20-40 parts semi-reinforcing agent; 0.5-3 parts accelerator; 1.5-3 parts vulcanizing agent; 2-5 parts plasticizer; and 2-5 parts antioxidant.

[0007] The angle of the rubber V-belt used in raising machines is 36°-38°.

[0008] The standard width of the rubber V-belt for raising machines is between 17mm and 18mm.

[0009] A special rubber V-belt for a napping machine and its manufacturing process, the specific steps of which are as follows:

[0010] I. Preparation Stage:

[0011] (1) Preparation of compression rubber layer formulation: The compression rubber formulation uses natural rubber / butadiene rubber as the rubber formulation. The rubber is mixed using an interlocking internal mixer. Natural rubber, butadiene rubber, and silicon carbide thermal conductive agent are added in sequence. When the mixing temperature reaches 100-110℃, activator, reinforcing carbon black, semi-reinforcing agent and plasticizer are added. When the mixing temperature reaches 130-140℃, the rubber is discharged and cooled to room temperature. During the final mixing, accelerator, vulcanizing agent and antioxidant are added. When the mixing temperature reaches 100-110℃, the material is discharged and sheeted for use.

[0012] (2) Preparation of compressed rubber layer: The material obtained in step (1) is calendered to produce 4-6mm rubber sheets and made into rubber blanks; the compressed rubber compound is extruded by cold feeding extrusion to extrude rubber strips of the corresponding size, cooled to room temperature, and then wound into rolls for later use;

[0013] (3) Preparation of skeleton rope: Using the winding process of the yarn drawing machine, the forming roller is moved to the reference length position of the belt, the skeleton material is placed on the forming roller, and then the top rubber is laid on the rope. The adhesiveness of the rubber itself is used to combine them together.

[0014] (4) Fabric preparation: The outer covering of the belt is made of wide-angle canvas. The rubber is heated and then attached to the surface of the canvas through the calendering process of the calender. The rubber and the canvas are tightly bonded by the action of the pressure roller. After cutting, it is ready for use.

[0015] II. Molding Stage

[0016] (1) Rubber coating: The skeleton cord and the compressed rubber layer are combined by the rubber coating machine. The uncured rubber itself is used to make it fully bonded. Then, the V-belt roots are cut apart with a cutter to make a rubber blank for later use.

[0017] (2) Covering the fabric: The fabric blank and the fabric are combined by the covering machine. The covering starts from the bottom of the fabric blank and wraps around it once. The two fabric edges overlap each other. After completing the two layers of covering, the fabric blank is made.

[0018] (3) Vulcanization: The strip blank is vulcanized into a finished product by a flat vulcanizing machine. The strip blank is installed in the order of the grooved rollers, the strip blank is tensioned, the mold is closed, and vulcanization is completed under pressure and temperature.

[0019] In step (1) of the preparation stage, the weight ratio of natural rubber to butadiene rubber is 60:40.

[0020] In step (1) of the preparation stage, when the mixing temperature reaches 105°C, activator, reinforcing carbon black, semi-reinforcing agent and plasticizer are added. When the mixing temperature reaches 135°C, the glue is discharged and cooled to room temperature. During the final mixing, accelerator, vulcanizing agent and antioxidant are added. When the mixing temperature reaches 105°C, the material is discharged and sheeted for use.

[0021] In step (3) of the preparation stage, the skeleton material is polyester yarn.

[0022] The rubber composition by weight in step (4) of the preparation stage is as follows: 60-80 parts natural rubber, 20-40 parts styrene-butadiene rubber, 40-60 parts carbon black N660, 5-8 parts zinc oxide, 2-3 parts stearic acid, 2-4 parts antioxidant, 3-5 parts adhesive RC, 8-10 parts softener, 2-4 parts accelerator, and 2.5-4.5 parts sulfur. This rubber ensures the viscosity of the fabric.

[0023] In step (4) of the preparation stage, the wide-angle canvas material is a blend of polyester and cotton warp and weft fabric.

[0024] In step (4) of the preparation stage, the latitude and longitude angles are between 110 and 120°.

[0025] In step (3) of the molding stage, the pressure is 0.5-0.7 MPa and the temperature is 150-160℃.

[0026] The reaction time is 15-20 minutes.

[0027] This invention optimizes the V-belt wedge angle (angle) to increase the contact area between the belt and the pulley, thereby improving the force-bearing area and friction resistance of the V-belt. It also optimizes the position of the skeleton cords and adjusts the position of the neutral layer (ensuring the reference width of the rubber V-belt for napping machines is between 17mm and 18mm), reducing the bending deformation of the compression layer and improving the bending fatigue life of the V-belt. Furthermore, the silicon carbide thermal conductive agent is a material with high thermal conductivity (140-180 W / (m·K)). Natural rubber itself has a thermal conductivity of 0.15-0.21 W / (m·K) and is a poor conductor of heat. Adding silicon carbide reduces the belt operating temperature by 10℃ and increases its service life by 40%.

[0028] The high-speed operation of the equipment and the significant rubber deformation under the reverse pressure rollers generate substantial frictional heat within the V-belt, with operating temperatures reaching 60-70℃. This accelerates the thermo-oxidative aging of the V-belt. This invention employs a high thermal conductivity compression rubber formula, which, compared to conventional V-belt compression rubber formulas, can reduce the operating temperature of the V-belt, slow down the thermo-oxidative aging process, and thus extend the V-belt's lifespan. This meets the requirements of the roughening machine's pulley system. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the mechanism of a rubber V-belt for a napping machine according to the present invention;

[0030] 1. Skeleton cord; 2. Compression adhesive; 3. V-belt angle; 4. Fabric covering layer. Detailed Implementation

[0031] Example 1

[0032] A rubber V-belt for a napping machine includes two compressed rubber layers, with a reinforcing cord between the two compressed rubber layers. Each compressed rubber layer is covered with a fabric layer. The compressed rubber layers contain the following components by weight: 60-80 parts natural rubber; 20-40 parts butadiene rubber; 20 parts silicon carbide thermal conductive agent; 3-6 parts activator; 30-60 parts reinforcing carbon black; 20-40 parts semi-reinforcing agent; 0.5-3 parts accelerator; 1.5-3 parts vulcanizing agent; 2-5 parts plasticizer; and 2-5 parts antioxidant.

[0033] The angle of the rubber V-belt used in raising machines is 36°-38°.

[0034] The standard width of the rubber V-belt for raising machines is between 17mm and 18mm.

[0035] A special rubber V-belt for a napping machine and its manufacturing process, the specific steps of which are as follows:

[0036] I. Preparation Stage:

[0037] (1) Preparation of compression rubber layer formulation: The compression rubber formulation uses natural rubber / butadiene rubber (weight ratio of 60:40) as the rubber formulation. The rubber is mixed using a meshing internal mixer. Natural rubber, butadiene rubber, and silicon carbide thermal conductive agent are added in sequence. When the mixing temperature reaches 105℃, activator, reinforcing carbon black, semi-reinforcing agent and plasticizer are added. When the mixing temperature reaches 135℃, the rubber is discharged and cooled to room temperature. During the final mixing, accelerator, vulcanizing agent and antioxidant are added. When the mixing temperature reaches 105℃, the material is discharged and sheeted for use.

[0038] (2) Preparation of compressed rubber layer: The material obtained in step (1) is calendered to produce 4-6mm rubber sheets and made into rubber blanks; the compressed rubber compound is extruded by cold feeding extrusion to extrude rubber strips of the corresponding size, cooled to room temperature, and then wound into rolls for later use;

[0039] (3) Preparation of skeleton yarn: Using the winding process of the yarn drawing machine, the forming roller is moved to the belt reference length position, the skeleton material (polyester yarn) is placed on the forming roller, and then the top rubber is laid on the yarn. The adhesive of the rubber itself is used to combine them together.

[0040] (4) Fabric preparation: The outer covering of the belt is made of wide-angle canvas. The wide-angle canvas is a blend of polyester and cotton warp and weft fabric with a warp and weft angle of 110-120°. The rubber (60-80 parts of natural rubber, 20-40 parts of styrene-butadiene rubber, 40-60 parts of carbon black N660, 5-8 parts of zinc oxide, 2-3 parts of stearic acid, 2-4 parts of antioxidant, 3-5 parts of adhesive RC, 8-10 parts of softener, 2-4 parts of accelerator and 2.5-4.5 parts of sulfur) is heated and attached to the canvas surface through the calendering process of the calender. The rubber and canvas are tightly bonded by the action of pressure rollers. After cutting, it is ready for use.

[0041] II. Molding Stage

[0042] (1) Rubber coating: The skeleton cord and the compressed rubber layer are combined by the rubber coating machine. The uncured rubber itself is used to make it fully bonded. Then, the V-belt roots are cut apart with a cutter to make a rubber blank for later use.

[0043] (2) Covering the fabric: The fabric blank and the fabric are combined by the covering machine. The covering starts from the bottom of the fabric blank and wraps around it once. The two fabric edges overlap each other. After completing the two layers of covering, the fabric blank is made.

[0044] (3) Vulcanization: The strip blank is vulcanized into a finished product by a flat vulcanizing machine. The strip blank is installed in the order of the grooved rollers. After the strip blank is tensioned, the mold is closed. Under the action of pressure (0.6Mpa) and temperature (155℃), the vulcanization is completed in 17 minutes.

[0045] The above content describes the technical principles, beneficial effects, and features of the present invention. It should be noted that the above description is only a preferred embodiment of the present invention, but is not limited to the above embodiments. For those skilled in the art, some improvements and optimizations can be made without departing from the content of the present invention, and these should be considered to fall within the protection scope of the present invention.

Claims

1. A manufacturing process for a special rubber V-belt for a napping machine, characterized in that, The specific steps are as follows: I. Preparation Stage: (1) Preparation of compression rubber layer formulation: The compression rubber formulation uses natural rubber / butadiene rubber as the rubber formulation. The rubber is mixed using an interlocking internal mixer. Natural rubber, butadiene rubber, and silicon carbide thermal conductive agent are added in sequence. When the mixing temperature reaches 100-110℃, activator, reinforcing carbon black, semi-reinforcing agent and plasticizer are added. When the mixing temperature reaches 130-140℃, the rubber is discharged and cooled to room temperature. During the final mixing, accelerator, vulcanizing agent and antioxidant are added. When the mixing temperature reaches 100-110℃, the material is discharged and sheeted for use. (2) Preparation of compressed rubber layer: The material obtained in step (1) is calendered to produce 4-6mm rubber sheets and made into rubber blanks; the compressed rubber compound is extruded by cold feeding extrusion to extrude rubber strips of the corresponding size, cooled to room temperature, and then wound into rolls for later use; (3) Preparation of skeleton rope: Using the winding process of the yarn drawing machine, the forming roller is moved to the reference length position of the belt, the skeleton material is placed on the forming roller, and then the top rubber is laid on the rope. The adhesiveness of the rubber itself is used to combine them together. (4) Fabric preparation: The outer covering of the belt is made of wide-angle canvas. The rubber is heated and then attached to the surface of the canvas through the calendering process of the calender. The rubber and the canvas are tightly bonded by the action of the pressure roller. After cutting, it is ready for use. II. Molding Stage (1) Rubber coating: The skeleton cord and the compressed rubber layer are combined by the rubber coating machine. The uncured rubber itself is used to make it fully bonded. Then, the V-belt roots are cut apart with a cutter to make a rubber blank for later use. (2) Covering the fabric: The fabric blank and the fabric are combined by the covering machine. The covering starts from the bottom of the fabric blank and wraps around it once. The two fabric edges overlap each other. After completing the two layers of covering, the fabric blank is made. (3) Vulcanization: The strip blank is vulcanized into a finished product by a flat vulcanizing machine. The strip blank is installed in the order of the grooved rollers, the strip blank is tensioned, the mold is closed, and vulcanization is completed under pressure and temperature. The special rubber V-belt for the napping machine includes two compressed rubber layers, with a skeleton cord between the two compressed rubber layers. Each compressed rubber layer is covered with a fabric layer. The compressed rubber layers contain the following components by weight: 60-80 parts natural rubber; 20-40 parts butadiene rubber; 20 parts silicon carbide thermal conductive agent; 3-6 parts activator; 30-60 parts reinforcing carbon black; 20-40 parts semi-reinforcing agent; 0.5-3 parts accelerator; 1.5-3 parts vulcanizing agent; 2-5 parts plasticizer; and 2-5 parts antioxidant. The angle of the rubber V-belt used in raising machines is 36°-38°. The standard width of the rubber V-belt for raising machines is between 17mm and 18mm.

2. The production process of a special rubber V-belt for a napping machine as described in claim 1, characterized in that: In step (1) of the preparation stage, the weight ratio of natural rubber to butadiene rubber is 60:

40.

3. The production process of a special rubber V-belt for a napping machine as described in claim 1, characterized in that: In step (1) of the preparation stage, when the mixing temperature reaches 105°C, activator, reinforcing carbon black, semi-reinforcing agent and plasticizer are added. When the mixing temperature reaches 135°C, the glue is discharged and cooled to room temperature. During the final mixing, accelerator, vulcanizing agent and antioxidant are added. When the mixing temperature reaches 105°C, the material is discharged and sheeted for use.

4. The production process of a special rubber V-belt for a napping machine as described in claim 1, characterized in that: In step (3) of the preparation stage, the skeleton material is polyester yarn.

5. The production process of a special rubber V-belt for a napping machine as described in claim 1, characterized in that: The weight composition of the rubber in step (4) of the preparation stage is as follows: 60-80 parts of natural rubber, 20-40 parts of styrene-butadiene rubber, 40-60 parts of carbon black N660, 5-8 parts of zinc oxide, 2-3 parts of stearic acid, 2-4 parts of antioxidant, 3-5 parts of adhesive RC, 8-10 parts of softener, 2-4 parts of accelerator and 2.5-4.5 parts of sulfur.

6. The production process of a special rubber V-belt for a napping machine as described in claim 1, characterized in that: In step (4) of the preparation stage, the wide-angle canvas material is a blend of polyester and cotton warp and weft fabric.

7. The production process of a special rubber V-belt for a napping machine as described in claim 6, characterized in that: In step (4) of the preparation stage, the latitude and longitude angles are between 110 and 120°.

8. The production process of a special rubber V-belt for a napping machine as described in claim 1, characterized in that: In step (3) of the molding stage, the pressure is 0.5-0.7 MPa and the temperature is 150-160℃.

9. The production process of a special rubber V-belt for a napping machine as described in claim 8, characterized in that: The reaction time is 15-20 minutes.

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