If you search for a jaw crusher, ball mill, vibrating screen or sand making machine from China, a large share of the results lead to Henan province. Zhengzhou, Gongyi, Xingyang and Xinxiang are home to hundreds of mining and aggregate machinery companies, and Changyuan in Xinxiang is known for cranes and hoists. Many of them export to Africa, Latin America, the Middle East and Southeast Asia.
The buyers who get hurt in this sector are usually not victims of fake companies. They buy a real machine from a real seller, and find out later that the seller only had an office, that the liners are the wrong steel, that the motor is smaller than quoted, or that nobody will send a technician. This guide covers how to avoid that.
Website companies and workshop companies
Henan mining machinery is sold through a lot of websites. Some belong to large manufacturers with foundries and machining halls. Many belong to sales companies in Zhengzhou office towers that buy machines from workshops in Gongyi or Xingyang and add their own nameplate.
Both can deliver a working machine. The difference shows up in three places: who controls the steel and the welding, who stocks the spare parts, and who sends an engineer when the plant does not run as promised. Before you pay, find out which kind of company you are dealing with.
Registration, scope and size
Ask for the registered name and unified social credit code, and check:
Business scope: manufacturing of mining or construction machinery, or only sales and technical services.
Registered address: an office building in Zhengzhou, or an industrial address in Gongyi, Xingyang, Shangjie or Xinxiang.
Social insurance headcount: a company with a 50,000 square meter factory on its website and 8 insured employees is not running that factory.
Court records: disputes over quality, unpaid suppliers, or labor cases.
Related companies: some groups use one company for export and another for production. That can be fine, but you should know which one signs your contract.
The full sequence is in how to verify a Chinese supplier: 12 checks before you pay.
What to see in the factory
On a live video walk-through or an on-site visit, ask to see:
Steel plate stock and cutting. Frames and housings start as plate. A factory cuts plate. An assembler receives finished frames.
Welding and stress relief. Large welded frames for crushers and screens should be welded by qualified welders and, for heavy duty frames, stress relieved. Ask how they do it.
Casting and wear parts. Jaw plates, mantles, concaves and hammers are wear parts. Ask whether they are cast in house or bought, and ask to see the foundry or the supplier.
Machining. Eccentric shafts, bearing housings and gear parts need large lathes and boring machines.
Assembly and trial run. A crusher or screen should be assembled and run before shipping. Ask to see a machine of your model running.
The specification is where the money goes
Two crushers with the same model number can differ a lot in price because of what is inside. Write these into the contract:
Wear part material. Jaw plates and mantles in high manganese steel, with the grade stated, for example Mn13 or Mn18. Lower grades wear much faster.
Bearings. Brand and model of the main bearings. Ask for photos of the bearings before assembly.
Motor. Power, voltage and frequency for your site, efficiency class and brand. A motor rated for 380 V 50 Hz will not run properly on a 440 V 60 Hz supply without being specified for it. Check the nameplate photo against the quotation.
Weight. The machine weight in the quotation is a useful check. Lighter frames usually mean thinner plate.
Spare parts and drawings. A first set of wear parts and a parts list with drawings, so you can buy locally if needed.
Complete plants and installation
For a full crushing or sand making line, the supplier usually designs the layout, supplies several machines from different makers, and offers installation guidance. Ask:
Which machines they make and which they buy in, and from whom.
Who designed the layout and on what capacity and material assumptions. Ask for the material test data they used.
Who pays for the installation engineer, for how many days, and what happens if commissioning takes longer.
What the warranty covers, from which date, and how spare parts are shipped.
Questions to send a Henan machinery supplier first
Send these before you discuss price. A real manufacturer answers them quickly and specifically. Vague answers, or answers that change later, tell you a lot.
What is your full company name and unified social credit code, and where is your factory?
Do you cut plate, weld frames, cast wear parts and machine shafts yourselves? Which parts do you buy in?
What grade of manganese steel are the jaw plates, mantles or liners?
Which brand and model are the main bearings and the motor, and what voltage and frequency will the motor be built for?
What is the weight of the machine you are quoting?
Can we watch a machine of this model run on a live video call before we order, and our own machine before shipping?
How many days of installation support are included, and who pays for the engineer's travel?
Payment and inspection
Pay a company account in the contract name. Be careful with requests to pay a different company "for tax reasons".
Link the balance to an inspection that checks the specification: plate thickness, wear part grade, bearing brand, motor nameplate, and a no-load trial run.
Photograph serial numbers of the machine and the motor, so you know the inspected machine is the one that ships.
When to ask me to check
Ask for an independent check when the seller is in an office building and the factory is somewhere else, when the price is far below other quotes for the same model, when the seller will not show plate cutting, welding or a trial run on video, or when you are buying a complete plant and the installation support is vague.
Supplier verification costs US$79 per supplier, or US$60 each for five or more, and takes 3 to 5 business days. An on-site factory audit starts from US$299 per factory plus travel at cost, and pre-shipment inspection from US$299 per day. Zhengzhou is a short high-speed train ride from my base in Xi'an. My own background is industrial electric motors, which drive every crusher, mill and screen. For other machinery regions, see Xuzhou construction machinery, the Shandong machinery case and the guide to China's manufacturing regions.
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LocalAuditChina is an independent verification service, not a certification body. Reports are findings to support your purchasing decision.
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