Floor Dinting Equipment: How Roadway Repair Machines Restore Cross-Sections

Published: November 2026 | By Tianmei Engineering Team

A roadway repair machine for floor dinting restores a deformed coal mine cross-section in one mechanized pass — cutting the heaved floor to design height, loading the muck and leveling the running surface at a documented 2.5 m per hour. That single pass replaces roughly a 10-person manual crew and is why mines with recurring floor heave keep a dedicated unit underground instead of renting general excavators. This guide walks through what these machines actually do, the specifications that decide performance in narrow sections, and the mechanized roadway rehabilitation workflow underground from mobilization to reinforcement. Published: November 2026 | By Tianmei Engineering Team.

1. What Does a Roadway Repair Machine Do During Floor Dinting?

A roadway repair machine for floor dinting does four jobs in one pass: it breaks or mills the heaved floor, loads the broken rock, levels the running surface and can cut the drainage ditch — all from a tracked chassis narrow enough to tram through the section it is repairing. That integration is what separates a floor dinting machine for coal mine roadways from a rented general excavator, which can dig but cannot load cleanly under a belt conveyor, level a 4 m-wide floor and tram out through a 2.5 m-high clearance without a second machine behind it.

Four specifications decide whether a unit can actually do that in your roadway:

✅ Hydraulic system pressure of 16–25 MPa — hard or rock-filled floors stall anything weaker.

✅ Minimum passing height of 1.2–1.6 m — the envelope must clear your lowest section, roof bolts and sagging cables.

✅ Boom swing and reach — look for roughly ±45° swing with 360° slew so the machine covers the full floor width without repositioning under conveyors.

✅ Quick-change coupling — breaker, bucket and milling head swaps in minutes, so a single unit covers the whole maintenance cycle instead of a fleet.

Power source is the other fork in the road. Flameproof diesel models tram anywhere without cables; cable-electric models run emission-free in gassy sections with lower noise and simpler maintenance. Most fleets eventually run both — diesel for long gateroads, electric for fixed duty points.

✅ Bottom line: Judge a dinting machine on four numbers — system pressure, passing height, boom swing and attachment change time — not on brochure horsepower.

2. How Does the Roadway Rehabilitation Workflow Underground Run, Step by Step?

The mechanized roadway rehabilitation workflow underground runs in five steps: survey and prepare, dint and mill, load and transfer, level the floor, then reinforce — and field results show 480 m of deformed gateroad restored in 40 days at 2.5 m per hour. The sequence matters as much as the machine: mines that skip step five are back on the same floor within months.

✅ Step 1 — Survey and prepare. Confirm section dimensions, mark cables and pipelines, set the target floor line, and position a scraper or belt conveyor at the machine's discharge point.

✅ Step 2 — Dint and mill. Cut the heaved floor 0.8–1.2 m deep in strips; where rock is hard, switch to the breaker or milling head first. Keep the machine's external spray running throughout — water suppression protects the crew's lungs and keeps pick consumption down in abrasive rock.

✅ Step 3 — Load and transfer. The machine's gathering arm loads muck straight onto the conveyor — at Yangquan No.1 Coal Mine this loop scraped 450 tons of floor per day, cutting manual labor by over 70%.

✅ Step 4 — Level and trim. The dozer blade and bucket level the running surface to line and grade so trackless equipment can pass again.

✅ Step 5 — Reinforce. Pre-grout broken floor strata, then install floor anchor cables — the step that turns a temporary fix into a permanent one.

A floor dinting machine for coal mine roadways pays for itself inside this loop: in China's Binchang mining area, one machine plus one scraper conveyor restored 480 m of gateroad in 40 days with ten fewer workers per shift than the manual method. The WPZC-150/2100L with milling head is a reference configuration for exactly this duty.

✅ Bottom line: Run the five steps in order and budget reinforcement into the job — dinting without anchoring just schedules the next repair.

FAQ

Q: Can a roadway repair machine for floor dinting work under a belt conveyor?
A: Yes — that is one of its core jobs. Low-profile tracked models pass under clearances of roughly 1.2–1.6 m, the boom slews to clean beneath the belt structure, and muck is discharged onto the conveyor directly. Cleaning under belt conveyors is a standard task in the maintenance cycle, not a special configuration.

Q: Which floor dinting machine for coal mine roadways suits a 3 m × 2.5 m section?
A: Match the envelope first: a compact tracked model with minimum passing height at or below 2.0 m (many run 1.2–1.6 m), a boom that reaches the full 3 m floor width, and either flameproof diesel or cable-electric power depending on your gas grade. Send the section drawing to the factory before ordering — envelope mismatch is the most common import mistake.

Q: What does one cost, and how is it shipped?
A: Ex-works pricing for mainstream configurations runs roughly USD 18,000–110,000 by power type and attachments. Units ship disassembled in containers, reassemble underground in hours, and Jiangsu Tianmei Electromechanical Technology Co., Ltd. supports commissioning, operator training and spare parts supply for export orders — worth confirming in writing before you pay, not after the machine arrives.

Get a Dinting Workflow Plan for Your Roadway

Tianmei builds roadway repair machines and mining hydraulic equipment in Xuzhou, China, with the full mechanized roadway rehabilitation workflow underground covered by one platform: WPZC diesel and WPZ electric models, milling head, breaker, bucket and dozer attachments, CE attestation on the roadway repair range. Send Tianmei your section drawing and floor rock strength, and our engineers will return a matched configuration and quote — free — within 48 hours. Browse the mining roadway repair machine range or contact the Tianmei factory for OEM and customized builds.

www.tmroadheader.com
Jiangsu Tianmei Electromechanical Technology Co., Ltd.