Top-drive four-roller compact spinning

Published specifications

Values below come from the maintained catalogue record. The guide review date does not renew an earlier specification: read the dated source notes and confirm a current, matched configuration before comparing products.

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Instead of a new machine, the mill gets a condensing zone, a suction supply and a drive added to the ring-spinning frame it already has. Haoming presents the top-drive layout as a way to leave the frame's own structure alone, and on the imported machine families it cites, the original front roller and its stand can stay where they are.

That saving only holds on a frame that matches those references. Model, build year, wear and past rebuilds all change what has to be swapped. Send the frame model and generation, the number of positions, the drafting layout, roller and stand geometry, drawings and a note of earlier modifications.

Ask Haoming to answer with a marked-up drawing that shows which parts stay, which are replaced, which are new, and which connections the mill itself must make. The product page dates from 7 April 2017, so ask too for the revision on offer today and its parts list. [1]

Two offers for the same kit can differ widely in what they actually deliver. Ask for a price against each of Haoming's five subsystems so you can see where a cheaper bid leaves work out. The note on how to compare machine configurations explains the same habit for whole machines. [1]

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Haoming changes tension draft by fitting guide and drafting rollers of different diameters, choosing the combination to suit the yarn being spun. The page gives no numeric range and no recommended setting for any particular yarn count.

Ask which roller combinations are available now, which yarns each one is meant for, how the right one is worked out, and what physically has to be swapped to move between them. Write the chosen combination into the trial record. A good sample is only useful if the same setup can be put back later. [1]

The intermediate transmission gears run inside a sealed roller box. A closed housing keeps fly and dust out, but the gears inside still wear. Ask how the box is opened, what lubricant it takes and how often, which wear parts are stocked, and how long a box swap takes on a running frame. [1]

Haoming's device page gives no before-and-after yarn data. A mill can produce its own by converting a group of positions and spinning them against unconverted ones from the same roving. [1]

1. Take a baseline

   Log frame condition, the fibre mix and roving batch, the yarn count and system, draft and twist, spindle speed, yarn quality and end breaks before any change.

2. Write down the conversion

   List every part that stayed or changed, the roller combination, suction readings, loading and control settings, and the alignment checks done at fitting.

3. Agree tests and sampling

   Pick the hairiness, strength and evenness tests that matter for your product, and sample across many positions, not a favoured few.

4. Spin under matched conditions

   Keep material and room conditions the same, or note every difference. Count accepted yarn, breaks, stops and operator interventions over a fixed run.

5. Meter the power

   If energy is part of acceptance, measure drive power plus the added suction load, and state how idle time and warm-up are treated.

6. File the recipe

   Hand over accepted samples, settings, test methods and cleaning instructions together, and agree who answers for later drift.

Before signing, agree the order of work on the frame, which original parts stay, what access the fitters need, and who removes old parts, fits new ones and makes the electrical and suction connections. Get a list of what the mill must have ready before the team arrives.

Ask for the commissioning steps, the checks at each stage, help with the first trial run, operator training and a schedule of spares and consumables. Agree how the frame returns to accepted production and what happens if a fit problem turns up halfway.

Haoming's report of 17 August 2026 covers a separate ZR71 job of about 30,000 positions, fitted and commissioned in roughly one month. Ask whether that job used this exact kit, and plan your own downtime from your frame count and site. [1] [2]

The device page publishes no yarn-count range, position limit, suction pressure or flow, motor load or quality gain. Ask for each of these for your frame, fibre and the configuration being offered.

No price, energy saving or payback figure is given either. A fair cost comparison adds up the full subsystem supply, the production lost during fitting, trial support, running costs for consumables and maintenance, and the yarn result accepted at handover. [1]