Qingdao Beishun's pin-type cold-feed extruder is a core processing equipment in the rubber industry. It achieves shearing and mixing of rubber compounds through a combination of radial and tangential pins. The equipment features a segmented barrel and screw optimized design, equipped with adjustable pins and a cooling system, exhibiting low-temperature, high-efficiency extrusion characteristics. Compared to traditional hot-feed extruders, it increases production capacity by 50% and reduces energy consumption by over 35%. It is suitable for molding tire treads, hoses, sealing strips, rubber sheets, and other products. Technological innovations include a bi-alloy screw material and an adjustable pin length mechanism, enabling a maximum production capacity of 3500 kg/h. A patented technology developed in 2024 improves shearing efficiency by 30%. The improved version uses a combination of circumferential grooving and hollow pins, increasing mixing efficiency to 98%. This equipment is an essential option for your rubber molding needs.

Technical Specifications

Machine parts composition?

• Pinning machine barrel: The cylinder is made of high-quality carbon structural steel, with an embedded 38CrMoAlA high-quality nitrided steel bushing. The bushing is heat-treated and surface nitrided, with an inner hole surface hardness of HRC65-70 and a hard layer depth of 0.5-0.7mm. The outer cylinder has axial channels drilled around its circumference for heating and cooling of the cylinder.
• Screw: Made of high-quality 38CrMoAlA nitrided steel, the spiral section undergoes tempering and surface nitriding treatment, achieving a surface hardness of HRC60-65 and a hardened layer depth of 0.5-0.7mm. The spiral structure employs equal-depth segmented variable-pitch configurations in the extrusion and plasticizing sections, and a composite design with four spiral heads and two grooved heads in the feeding section. This spiral configuration features high strength, strong feeding capacity, thorough shearing and plasticizing mixing, stable extrusion pressure, low temperature, and high output, and it is highly adaptable to various rubber compounds.
• Feeding device: It consists of a feed roller, roller cover, bearing housing, gear pair, bearing, roller sleeve, etc. The feed roller surface is designed with a reverse rubber spiral, which can effectively prevent rubber from entering the feed roller support bearing and ensure the normal operation of the feeding device. The feed roller surface and the reverse rubber groove are surface hardened to a surface hardness of HRC50-55 and a hardened layer depth of 1-2mm. The gear pair has an independent lubrication system. The feeding device is installed on one side of the machine body.
• Feeding section barrel: It consists of a fuselage, a front bushing, and a rear bushing. Both the front and rear bushings are made of high-quality 38CrMoAlA nitrided steel, treated with quenching and tempering and surface nitriding. The inner bore surface hardness is HRC65-70, the hardened layer depth is 0.5-0.7mm, and spiral grooves are machined on the inner bore surface. The fuselage is made of ZG270-500 steel and has a cast-in-place cavity for heating and cooling..
• Five-channel temperature control device: The temperature control sections are divided into one section each for the feeding section, the middle barrel, the screw, and the front barrel. Each channel is an independent control unit. The circulating medium for the temperature controller is softened water, with an inlet pressure of 0.2-0.3 MPa. The heating power of each channel is 16 kW, and the temperature control accuracy is ±1°C. A hot water circulation pump is used, and an intelligent automatic temperature control system from RKC Corporation of Japan is employed. It also features automatic water replenishment, protection functions such as preventing the hot water circulation pump from starting and the heater from heating in the absence of water or water shortage, over-temperature alarm and automatic power-off, and automatic venting.

Primary Applications

Our heavy-duty rubber manufacturing machinery and production lines are widely used in the global polymer processing and manufacturing industry. In the tire and automotive industries, our φ-pin cold feed extruders are core equipment for high-volume rubber sheet and tread extrusion, meeting stringent safety and performance specifications. In the industrial rubber products manufacturing sector, our machinery can process a variety of elastomer products, including conveyor belts, heavy-duty treads, bridge bearings, and specialized rubber sheets.

Frequently Asked Questions (FAQ)