PLC Grouting System Post Tension Injection Cement Machine

The ZNYJ-Ⅱ-700 is an intelligent, PLC-controlled grouting unit designed for post-tension (pre-stressed) tendon injection and general cementitious grouting. It integrates automatic water filling, slurry distribution, high- and low-speed mixers, vacuum pump, screw squeeze pump and electric valves for automated grout production and injection.

High-speed mixer speed 1100 rpm, single mixing capacity up to 500 kg, mixing measurement accuracy better than 0.2% (rated amount), high-speed motor 5.5 kW. Low-speed storage mixer speed 70 rpm, storage capacity up to 800 kg, low-speed motor 1.5 kW. Two spiral conveyors (motors), each 3 kW. Maximum slurry pressure 1.2 MPa with pressure display accuracy better than 1%. Overall weight ~1.2 t and dimensions 2900 mm × 1500 mm × 2300 mm.

The unit is intended for cement-based grouts used in post-tension injection (cement, water and common admixtures). Use of specialized resins or non-cementitious materials should be confirmed with the manufacturer before use.

The PLC control manages automatic water filling, programmed slurry dosing and distribution, mixer operation, screw feeding, vacuum pump control, electric valves and pressure monitoring—enabling automated batch mixing, storage and injection sequences to reduce manual intervention.

Maximum single mixing (high-speed) capacity is 500 kg. The low-speed storage tank can hold up to 800 kg.

Maximum slurry pressure is 1.2 MPa. The slurry pressure display has an accuracy better than 1%.

The system provides measurement accuracy better than 0.2% for the rated mixing amount, ensuring consistent batch proportions.

Typical workflow: verify power and leveled placement, program the PLC batch parameters, load cement and admixtures (automatic feeding handles bulk material), start the high-speed mixer for the measured batch, transfer mixed slurry to the storage mixer, use the screw squeeze pump and vacuum system for line priming and injection, and monitor pressure and PLC status during injection. Always follow the supplied operation manual and site procedures.

The datasheet lists motor powers for components, but specific power supply voltage/current and connector details are not included here. A stable industrial power supply (typically three-phase) and proper grounding are required. For exact electrical specifications, circuit protection and site hookup instructions, consult the manufacturer's electrical documentation or contact the supplier.

Clean mixers, discharge lines and pumps immediately after use by flushing with water to prevent grout setting. Regularly inspect and service seals, liners, pump components and valves. Maintain the vacuum pump per manufacturer recommendations, lubricate bearings and screw conveyors, and periodically calibrate sensors and weighing/dosing systems. Keep a maintenance log and use genuine spare parts.

For inconsistent mixes: verify water/cement ratios and check feeder calibration. For low discharge pressure: inspect pump, suction lines, valves and vacuum system for leaks or blockages. For clogs: stop, depressurize and clean lines; check particle size or mix fluidity. If PLC alarms occur, consult the error code log and operator manual; contact service if unresolved.

The ZNYJ-Ⅱ-700 is described as easy to move; its weight is approximately 1.2 t and dimensions are 2900 × 1500 × 2300 mm. It can be relocated on site using suitable lifting equipment or a trailer/forklift per the manufacturer’s transport instructions and lifting points.

Spare parts, commissioning services and operator training are typically provided by the manufacturer or authorized dealers. Contact your supplier to arrange spare parts, recommended spares list, on-site commissioning and formal training packages.

Follow standard site PPE requirements (eye/hand protection, respiratory protection when handling dry cement), ensure pressure lines are secured and pressure relief/isolation procedures are known, lock out/tag out electrical sources before maintenance, never open pressurized lines, and adhere to the machine’s safety sections in the operator manual. Ensure only trained personnel operate the PLC and pumping systems.