 |
| Quantity: | |||||||||
|---|---|---|---|---|---|---|---|---|---|
Product Description
The SGK Series pipe belling machine is a dedicated end-forming solution engineered for thermoplastic pipe production, including PVC, PE, and PP materials. As a critical downstream unit in modern pipe extrusion lines, the SGK series forms precision bell (socket) ends on pipe sections, enabling reliable push-fit or solvent-weld joint assembly in subsequent pipeline installation.
Six standard models — SGK563, SGK250, SGK315, SGK400, SGK630, and SGK800 — collectively cover pipe diameters from Φ20 mm up to Φ800 mm, making the series suitable for everything from small-bore residential conduits to large-diameter municipal mains. Both fully automatic and semi-automatic configurations are available, allowing Chenxing Machinery customers to match the automation level to their production volume, labor availability, and budget.
Whether deployed as an inline station synchronized with a plastic pipe haul-off and dust-free pipe cutter cutter on a continuous extrusion line, or operated as a standalone off-line work cell, the SGK series delivers consistent socket geometry, controlled wall thickness in the bell zone, and high repeatability across production batches.
The fully automatic variant handles the complete belling cycle without operator intervention. Pipe sections are fed into the machine via an automatic loading mechanism, positioned against the mandrel, heated to the required forming temperature, expanded (by vacuum suction or mechanical double-pipe expansion depending on model), cooled for dimensional stabilization, and ejected onto a discharge conveyor — all sequenced by the onboard PLC controller.
This configuration is ideal for high-volume production environments where consistent cycle time, minimal labor cost, and 24/7 unmanned operation are priorities. When integrated into a continuous extrusion solution alongside upstream equipment such as a high-speed mixer and a screw feeder, the fully automatic SGK belling machine forms a seamless production cell capable of running lights-out shifts.
The semi-automatic configuration automates the heating, forming, cooling, and demolding phases while requiring an operator to manually load each pipe section and remove the finished socketed piece. This configuration reduces capital investment compared to the fully automatic version while still maintaining precise control over forming temperature, vacuum pressure, and cooling time via the PLC touch screen interface.
Semi-automatic SGK models are well-suited for medium-volume manufacturers, workshops transitioning from manual belling methods, and facilities producing a wide range of pipe diameters with frequent changeovers, where the flexibility of manual loading offsets the higher throughput of fully automated handling.
| Model No. | Pipe Diameter (mm) | Belling Method | Cooling Type | Heating Power (kW) | Total Power (kW) |
|---|---|---|---|---|---|
| SGK563 | Φ20–63 | Double Pipe | Wind or Water | 4 | 5.53 |
| SGK250 | Φ63–250 | Vacuum | Water | 4 | 10.1 |
| SGK315 | Φ110–315 | Vacuum | Water | 7.2 | 12.1 |
| SGK400 | Φ160–400 | Vacuum | Water | 15.6 | 22 |
| SGK630 | Φ315–630 | Vacuum | Water | 25.4 | 36.2 |
| SGK800 | Φ630–800 | Vacuum | Water | 32 | 60 |
Notes:
All models use interchangeable belling molds; mold sets are ordered separately based on target pipe OD and socket profile specifications.
SGK563 employs a double-pipe simultaneous belling method, processing two pipe ends in parallel for small-diameter production efficiency.
SGK250 through SGK800 use vacuum-assisted forming (negative pressure draws the softened pipe wall against the mold cavity), ensuring uniform wall thickness in the bell zone.
Wind cooling is available as an option on the SGK563; all other models use recirculated water cooling for rapid thermal stabilization. An industrial chiller can be integrated for closed-loop cooling in facilities without adequate process water supply.
The SGK series offers both automation levels from the same engineering platform. Customers can select fully automatic models for high-throughput 24/7 production or semi-automatic models for flexible medium-volume operation, with both configurations sharing the same core heating, forming, and control technology. This dual approach optimizes capital expenditure while future-proofing the investment — a semi-automatic machine can often be upgraded as production volumes grow.
Six precisely graded models eliminate over-investment in oversized equipment. SGK563 handles residential-grade small-bore pipes (Φ20–63 mm), SGK250 and SGK315 cover mid-range construction and industrial diameters, while SGK400, SGK630, and SGK800 extend to large-diameter municipal and infrastructure pipes up to Φ800 mm. The incremental power scaling (5.53 kW to 60 kW total) ensures energy costs remain proportional to the actual pipe diameter being processed.
The SGK563's double-pipe mechanism simultaneously forms two small-diameter pipe ends, effectively doubling throughput for the Φ20–63 mm range — a critical advantage in high-volume conduit and small-bore plumbing pipe production. All other models (SGK250–SGK800) employ vacuum-assisted forming, where negative pressure within the mold cavity draws the heat-softened pipe wall uniformly against the mold surface. This method produces consistent wall thickness distribution in the bell zone, which is essential for long-term joint integrity under pressure and ground-load conditions.
The SGK563 supports both forced-air (wind) cooling and recirculated water cooling, allowing manufacturers to select the most cost-effective method for their facility infrastructure. Mid-range and large models (SGK250–SGK800) employ water cooling as standard for faster thermal stabilization and higher cycle rates. Water-cooled models can be paired with a SML air-cooled chiller for closed-loop temperature management, reducing water consumption and maintaining consistent cooling performance independent of seasonal ambient temperature fluctuations.
Every SGK model can be mechanically and electrically synchronized with an upstream extrusion line for inline belling — the pipe is cut to length by a pipe cutting machine, pulled through by a caterpillar haul-off machine, and fed directly into the belling station without intermediate handling. Alternatively, the machine functions as an independent off-line unit, fed from a buffer stock of pre-cut pipe sections for batch processing. This dual-mode capability supports diverse plant layouts and production strategies.
Belling molds are precision-machined per customer pipe OD and socket profile requirements and can be swapped out in minutes during model changeovers. Mold sets are ordered separately, allowing one machine to serve multiple pipe product lines with rapid reconfiguration. The mold clamping system uses positive mechanical locking to ensure zero mold shift during the forming cycle, directly contributing to socket dimensional consistency.
All SGK models are controlled via a PLC system with a color touch screen HMI. Operators set heating temperature, forming time, vacuum level (on vacuum models), and cooling duration for each pipe specification and save them as named recipes. Recipe recall eliminates manual parameter re-entry during product changeovers, reduces setup errors, and ensures that every production batch uses identical process parameters. Real-time process data display supports inline quality monitoring.
The machine frame is fabricated from heavy-gauge welded steel, stress-relieved to maintain geometric stability under thermal cycling. Linear guide rails on loading, heating, and forming stations ensure precise alignment throughout the machine's service life. Full-coverage safety guards with interlocked access doors protect operators from hot surfaces and moving components. The vacuum system on SGK250–SGK800 models includes a dedicated vacuum pump, buffer tank, and filtration circuit sized for continuous production duty.
The SGK series pipe socketing machine follows a six-stage automated cycle:
1. Loading & Positioning
The pipe section is fed into the machine — automatically via a loading mechanism (fully automatic models) or manually by an operator (semi-automatic models) — and clamped in precise alignment with the belling mandrel. End-stop positioning ensures consistent insertion depth across all cycles.
2. Heating & Softening
The pipe end enters the heating station, where electric heating elements raise the pipe wall to the material-specific softening temperature (typically 120–180°C for PVC, 130–200°C for PE, and 150–200°C for PP). Temperature is PID-controlled via thermocouple feedback, with heating duration automatically adjusted to pipe diameter and wall thickness.
3. Belling / Socket Forming
The softened pipe end is transferred to the forming station. On the SGK563, a mechanical double-pipe expansion mechanism simultaneously forms two pipe ends. On SGK250–SGK800 models, the vacuum system evacuates the mold cavity, drawing the pliable pipe wall outward against the precision-machined mold surface to create the bell profile — including any required sealing ring groove geometry.
4. Cooling & Dimensional Stabilization
The formed bell is cooled under controlled conditions to lock in the final dimensions. Water-cooled models circulate chilled water through cooling jackets in the mold; wind-cooled models (SGK563 option) use forced ambient air. Controlled cooling prevents shrinkage-induced dimensional drift and residual stress in the bell zone.
5. Demolding & Extraction
Once the pipe wall temperature drops below the material's heat deflection threshold, the mold opens, the mandrel retracts, and the socketed pipe section is released. The extraction mechanism moves the finished piece to the discharge zone.
6. Discharge & Cycle Reset
The finished pipe section exits onto a discharge conveyor or collection rack, and the machine resets for the next cycle. In fully automatic inline configurations, discharge is synchronized with the downstream handling equipment.
This six-stage cycle typically completes in 30–120 seconds depending on pipe diameter, wall thickness, and material, delivering consistent socket geometry suitable for international joint standards.
The SGK series pipe belling machine produces socketed pipes used across a wide range of industries:
Bell-and-spigot PVC and PE pipes with SGK-formed sockets are standard in gravity sewer mains, stormwater drainage networks, and wastewater collection systems. The vacuum-formed socket profile ensures reliable joint sealing under variable groundwater and soil load conditions.
Residential and commercial plumbing systems use socketed pipes for both potable water distribution (PE/PVC-U) and DWV (drain-waste-vent) applications. The SGK563 and SGK250 models are particularly prevalent in this segment, producing pipe diameters consistent with building codes worldwide.
Rigid PVC conduit with belled ends simplifies on-site assembly of underground and in-wall cable pathways. The double-pipe SGK563 is well-adapted for high-volume conduit production, where throughput and per-unit cost are primary competitive factors. Pipe sections produced on SGK machines are compatible with cable-pulling operations supported by extrusion solutions.
Medium-density PE (MDPE) and HDPE gas pipes with socket-fused joints rely on precision bell geometry for fusion joint integrity. SGK vacuum-formed bells provide the consistent internal diameter and wall thickness required for electrofusion and butt-fusion jointing procedures in gas distribution networks.
Large-diameter PE and PVC irrigation mains (Φ110–400 mm typical, up to Φ630 mm for main supply lines) benefit from SGK-formed socket joints that withstand cyclic pressure surges and soil movement. The SGK315, SGK400, and SGK630 are the primary models serving agricultural pipe manufacturers.
Industrial PP and PVC-U pipes with socket joints are used for chemical effluent, process water, and clean-in-place (CIP) piping in chemical and pharmaceutical plants. SGK-formed bells maintain the corrosion-resistant integrity of the pipe system at joint locations.
Chenxing Machinery brings decades of plastic processing equipment manufacturing experience to the SGK series design. Every belling machine is built in the company's Zhangjiagang facility using domestically sourced structural steel, internationally recognized electrical components, and precision-machined forming tooling. The engineering team provides mold design support, on-site commissioning, and operator training to ensure each SGK machine integrates smoothly into the customer's existing production workflow.
Customers operating complete extrusion lines benefit from Chenxing's single-supplier capability: a typical pipe production line sourced from Chenxing includes the extruder, die head, vacuum calibration tank, cooling tanks, caterpillar haul-off, dust-free cutter, and SGK belling machine — all engineered for mechanical and control-system compatibility. Ancillary equipment such as plastic crushers for scrap reprocessing, pulverizers for powder preparation, plastic grinding machines, vibrating screens, and plastic pelletizers for raw material recycling are also available from Chenxing, enabling turnkey project delivery. For profile and sheet applications, complementary lines such as the PVC WPC foam board extrusion line and PVC hot-cutting pelletizing line extend the product portfolio further.
After-sales support includes remote diagnostics, spare parts availability from stock, and field service engineer deployment for critical maintenance. Spare mold sets, heating elements, vacuum pump consumables, and PLC backup modules are maintained in inventory for all active SGK models.
A pipe belling machine and a pipe socketing machine refer to the same type of equipment — both terms describe a machine that forms an enlarged end (bell or socket) on a thermoplastic pipe section to enable joint assembly. "Belling" is more common in North American terminology, while "socketing" is frequently used in European and Asian markets. The SGK series performs this function across PVC, PE, and PP pipes. For a detailed technical explanation of the belling process and machine types, refer to our dedicated article: What is a Pipe Belling Machine.
Model selection is driven primarily by your pipe OD range. SGK563 covers Φ20–63 mm (ideal for small-bore conduit and plumbing pipe); SGK250 covers Φ63–250 mm; SGK315 covers Φ110–315 mm; SGK400 covers Φ160–400 mm; SGK630 covers Φ315–630 mm; SGK800 covers Φ630–800 mm. If your production spans multiple ranges, consider two machines to optimize cycle time and energy efficiency. Our sales engineers can evaluate your full product portfolio and recommend the most cost-effective configuration. Contact Nicole at ceo@cxsljx.com for a customized model recommendation.
Yes. The SGK series is designed for all common thermoplastic pipe materials — PVC (uPVC, CPVC), PE (HDPE, MDPE), and PP (PP-H, PP-R). The primary adjustment when switching materials is the heating temperature profile, which is managed through the PLC recipe system: each material grade can have its own saved recipe with optimized heating temperature, soak time, forming duration, and cooling parameters. The mechanical forming system (vacuum or double-pipe) and cooling circuit are material-agnostic. Mold sets are also material-independent; the same mold can form PVC and PE pipes of the same nominal diameter.
Minimum requirements depend on the model and cooling method. All models require a stable electrical supply matching the total power rating (5.53–60 kW depending on model). Water-cooled models (SGK250–SGK800) need a process water supply at adequate pressure and flow rate, or a closed-loop industrial chiller for recirculated cooling. Compressed air is required for pneumatic clamping and actuation (typically 0.6–0.8 MPa). A dedicated mold set matching your pipe OD is ordered separately. When integrating inline, synchronization signals are exchanged with the upstream caterpillar haul-off and pipe cutter. Chenxing provides a full utilities specification sheet with each quotation.
Cycle time ranges from approximately 30 seconds for small-diameter pipes (Φ20–50 mm on SGK563) to 90–120 seconds for large-diameter pipes (Φ630–800 mm on SGK800). The primary determinants are: (a) pipe wall thickness — thicker walls require longer heating time to reach uniform softening temperature through the cross-section; (b) material thermal properties — PE typically requires longer heating than PVC at the same diameter; (c) cooling method — water cooling is faster than air cooling; (d) automation level — fully automatic models have slightly faster load/unload times than semi-automatic. The PLC displays real-time cycle data, allowing operators to fine-tune parameters for optimal throughput.
Standard lead time is 30–45 working days from order confirmation, depending on model and current production queue. Custom mold sets may add 10–15 working days to the lead time. All SGK machines carry a 12-month warranty covering manufacturing defects in materials and workmanship. The warranty covers the main machine structure, heating system, vacuum system, PLC controller, and pneumatic components. Wear parts (heating elements, seals, guide rail wipers) are excluded from warranty coverage but are stocked for immediate dispatch. Extended warranty packages and preventive maintenance contracts are available — please contact Nicole at +8615951187228 for details.
Ready to add SGK series belling capability to your pipe production line? Our inquiry-to-quotation process is designed to deliver an accurate, customized proposal within 48 hours.
Step 1: Share Your Pipe Specifications
Send us your target pipe material (PVC PE PP), outer diameter range (min–max), wall thickness range, and the socket profile standard you need (ISO, DIN, ASTM, GB, or custom drawing). This information determines the optimal SGK model and mold design.
Step 2: Confirm Automation Level & Line Configuration
Indicate whether you need fully automatic or semi-automatic operation, and whether the belling machine will run inline with an existing extrusion line or as a standalone unit. If inline integration is required, share your current line speed (m/min) and control system brand for interface verification.
Step 3: Receive Customized Quotation
Within 2 working days, you will receive a detailed quotation including the recommended SGK model, mold set specification, utility requirements, shipping dimensions and weight, FOB/CIF pricing, and estimated delivery schedule. For complete extrusion line inquiries, we also quote complementary equipment — haul-off machines, pipe cutters, mixers, crushers, pulverizers, and auxiliary units as required.
Step 4: Confirm Order & Schedule Production
Upon order confirmation and deposit, your SGK machine enters the production schedule. You will receive regular build-status updates, pre-shipment inspection photos/videos, and packing-list documentation before dispatch. On-site commissioning and operator training can be arranged as optional services.
Contact Information:
Contact Person: Nicole
Phone / WhatsApp: +8615951187228
Email: ceo@cxsljx.com
Company: Zhangjiagang Chenxing Machinery Co., Ltd.
Website: www.chenxingmachinery.com
