🏭Manufacturer since 1987 · 3 production bases: Hangzhou · Weihai · Wuhu
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Factory & trust

Three questions decide whether we are a factory: workshop, machining, inspection

Buyers who meet us at a trade fair and then look us up online are trying to answer one question — is this a manufacturer or a reseller? There are only three things that settle it, and all three are on this page.

3Production bases
In-houseMachining & heat treatment
Every unitTested before shipment
VisitWelcome, any time

1 · A workshop you can walk through

A trading company can print a catalogue. It cannot show you a floor where crusher frames are being machined, cones are being assembled and finished machines are waiting for shipment. We publish that evidence and, more to the point, we invite you to come and stand on it — with your own inspector if you have one, and with a live video walk-through if travelling is impractical.

Manufacturing is spread across Hangzhou (headquarters), Weihai and Wuhu, totalling 153,000 m². Annual production capacity is 1,000 units, with an average shipping rate of 100 units per month.

Shuangjin Machinery factory main gate, Hangzhou
Hangzhou headquarters, Zhejiang Province
SK.Y hydraulic cone crusher under final assembly
SK.Y hydraulic cone under final assembly
SJ spring cone crushers lined up ready for shipment
SJ spring cone series awaiting shipment
Complete crushing plant with conveyors and steel structure
Complete line — structure and conveyors self-fabricated

2 · Machining and heat treatment on the loaded parts

The question that separates a real manufacturer from an assembler is not "do you have a workshop?" but "who machines the parts that take the load?". Main frames, eccentric shafts, gear pairs and bowl assemblies are where a crusher lives or dies, and they are the parts most likely to be bought in by companies that describe themselves as manufacturers.

  • CNC machining in-house of main frames, shafts and eccentric assemblies — the load path, not just the covers.
  • Heat treatment applied to key load-bearing components, so that hardness and toughness are controlled rather than inherited from a supplier's certificate.
  • Non-destructive testing (NDT) on critical parts before assembly — a casting defect found in our works costs a fraction of one found on your site.
  • Gear pairs lapped as a matched set, which is why the drive train is quiet and long-lived rather than merely functional.
  • Structural steel and conveyors fabricated in-house to the same drawings as the machines, so the interfaces fit.

3 · Inspection before shipment, with paperwork

Every crusher is assembled, run-tested and inspected before it leaves the works. What matters to an overseas buyer is not the claim but the document: a factory test report with the machine's serial number, the run-test record where applicable, key dimensional checks, and the packing list that the report is tied to. If delivery is against an L/C or a third-party inspection, the same evidence is what your bank or inspector will ask for.

What we normally issue with a shipment
DocumentIssued forPurpose
Factory test / inspection reportEvery machineSerial-numbered record of assembly checks and run test where applicable
Material certificatesKey cast and machined componentsTraceability of the parts that carry the load
Packing list & loading planEvery shipmentCustoms clearance, insurance and FCL loading
Foundation & GA drawingsComplete lines and major machinesCivil works and site layout before the ship arrives
Operation & maintenance manualEvery machineOn-site operation, maintenance and wear-part replacement
Wear-parts list & first-year scheduleEvery line and major machineStore planning and budget forecasting
Certificates (ISO, CE documentation, enterprise credentials)On requestTender submissions, import formalities, client quality systems

Requirements differ by country and by client. If your project specifies a particular certificate, material standard or third-party inspection regime, raise it at enquiry stage — documentation has to be produced during manufacture, not assembled afterwards.

Certificates we can support. National High-Tech Enterprise · Zhejiang "Specialized & Sophisticated" SME · vice-chair unit of the China Sand & Gravel Association · co-drafter of China's mechanism sand & gravel technical regulation (2014) · ISO quality management system · CE documentation support by arrangement. Copy certificates are issued on request; request the document set and tell us what your tender requires.

Hard references that predate this website

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Industry standard

Co-drafter, 2014

Invited to co-draft China's technical regulation for mechanism sand and gravel production — a committee seat held by manufacturers with operating experience, not by resellers.

⚡
Nuclear power projects

Taohuagang · Shidaowan

Equipment supplied into nuclear power project environments, where documentation and inspection discipline are non-negotiable.

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National status

High-Tech Enterprise

National High-Tech Enterprise recognition, plus Zhejiang "Specialized & Sophisticated" SME designation and a provincial R&D centre.

Common questions buyers ask before trusting a supplier

Can I visit the factory or send an inspector?

Yes, and we encourage it. Tell us your dates and we will arrange the visit, including the works you want to see. If travel is impractical, we can do a live video walk-through of the assembly floor and the test bay at a time that suits your time zone.

Can you provide a video of our machine being tested?

For major machines, yes — we can film the assembly and run test and send it with the inspection report before shipment. Ask for it at order stage so it is built into the production schedule rather than requested at the last minute.

What certificates can you supply for import clearance?

We support the documentation needed for African and Southeast Asian clearance regimes including SONCAP (Nigeria), PVoC (Kenya) and SABS (South Africa), and we assist through the clearance process — see the resources page for the article on which certificates to demand. For CE or GOST-related requirements, tell us the destination and the project's specification and we will confirm what we can issue.

Is your equipment covered by a warranty?

Yes, with terms stated in the contract in the same words as we publish. Warranty period, coverage and exclusions are agreed at order, not discovered at claim time. See the spare-parts and after-sales page for the service commitments that run alongside it.

Arrange a factory visit or a live walk-through

Come and see the workshop, the machining area and the test bay. Or have us walk you through it on video at a time that suits your time zone.

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