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Methods for Adjusting and Key Operational Points of Wet Spray Machine Pumping Speed
Release time:
2026-01-06
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Summary:
The adjustment of the pumping speed in wet-mix shotcrete machines is a critical operational step during construction, directly affecting the quality of concrete spraying, equipment efficiency, and material utilization. Proper speed adjustment can effectively reduce rebound rates, ensure the compactness of the sprayed layer, and extend the service life of the equipment.
I. Principles and Methods for Adjusting Pumping Speed
Modern wet spray machines primarily achieve stepless adjustment of pumping speed through a hydraulic system. The core principle involves controlling the concrete delivery rate by varying either the displacement of the hydraulic pump or the engine speed. Currently, the mainstream adjustment methods include:
Electro-hydraulic proportional control
The controller outputs a current signal to drive the proportional solenoid, which in turn adjusts the swashplate angle of the hydraulic pump, enabling precise control of displacement. This method features high adjustment accuracy and rapid response, making it the standard configuration for modern wet spray machines.
Engine speed adjustment
By adjusting the hydraulic pump’s output flow through changes in engine speed, this method features a simple structure but relatively low adjustment accuracy, and is often used in cost-effective equipment.
Manual throttling adjustment
Flow is controlled by manually adjusting the throttle valve opening. Although this method is simple to operate, its accuracy is relatively poor and has gradually been replaced by automated control systems.
II. Specific Operation Steps for Speed Adjustment
Preparatory work
1. Confirm that the equipment is in a stable operating state and that all system parameters are normal.
2. Verify that the concrete mix proportion meets the design requirements and that the slump is within the appropriate range.
3. Confirm that the delivery pipelines are unobstructed and the nozzles are functioning properly.
Parameter Settings
1. Set the reference pumping speed according to construction requirements.
2. Adjust the system pressure limit to ensure it remains within a safe range.
3. Set appropriate acceleration and deceleration curves to avoid pressure surges.
Speed fine-tuning
1. Initially start pumping at a lower speed (30-50% of the rated value).
2. Observe the concrete discharge condition and gradually increase to working speed.
3. Adjust in real time according to the rebound situation to find the optimal speed point.
III. Key Factors Influencing the Selection of Pumping Speed
Concrete performance parameters
The mix proportion of concrete directly affects the selection of the optimal pumping speed: when the slump is between 160 and 200 mm, a higher pumping speed can be used; as the aggregate particle size increases, the pumping speed should be appropriately reduced; fiber-reinforced concrete requires a lower and more stable pumping speed.
Construction Condition Requirements
Different construction conditions require corresponding pumping rates: For flat-surface spraying, a higher rate (12–18 m³/h) can be used; for arch-top spraying, the rate should be reduced (8–12 m³/h); and in areas with dense reinforcement, the rate should be further lowered.
Equipment status parameters
The equipment’s own condition also affects the selection of speed: for every additional 20 meters in conveying distance, the speed should be reduced by 5-8%; each bend in the pipeline is equivalent to the resistance of 10-15 meters of straight pipe; when the equipment has been in use for a longer period, the rated speed should be appropriately reduced.
IV. Precautions for Speed Adjustment
Pressure monitoring
During the adjustment process, it is essential to closely monitor system pressure: the main system pressure should be maintained within the range of 8–20 MPa; pressure fluctuations should not exceed ±2 MPa; if any pressure anomalies occur, the cause should be promptly investigated.
Quality assurance
Speed adjustments must take construction quality into account: going too fast will increase the rebound rate; going too slow will reduce construction efficiency. It’s essential to find the optimal balance between efficiency and quality.
Safe operation
During the adjustment process, safety regulations must be strictly followed: Speed changes should be made gradually to avoid sudden shifts; pay close attention to the equipment’s operating status during adjustments; and in case of any abnormalities, immediately switch to manual mode.
V. Speed Adjustment Strategies Under Different Operating Conditions
Conventional concrete spraying
For conventional concrete spraying operations: The initial spray rate should be set at 10–12 m³/h; fine-tune it to the optimal value based on the rebound condition; maintain a stable spray rate and avoid frequent adjustments.
Fiber-reinforced concrete construction
Fiber-reinforced concrete requires special speed control: Use a lower and stable pumping rate (8–10 m³/h); avoid sudden changes in speed that could lead to uneven fiber distribution; and closely monitor changes in pipeline pressure.
Construction of Special Areas
Differentiated strategies should be adopted for different construction areas: appropriately reduce the speed at edges and corners; increase the speed on large, flat surfaces; and ensure continuous speed at layer junctions.
VI. Fault Prevention and Emergency Handling
Pipe blockage prevention
Prevent pipe blockages by setting a reasonable flow rate: Maintain a stable flow rate and avoid drastic fluctuations; promptly adjust the flow rate if you notice an abnormal increase in pressure; and regularly inspect areas prone to blockages.
Device protection
Speed adjustments should take equipment protection into account: avoid prolonged operation under overload; pay attention to the temperature rise in the hydraulic system; and regularly inspect the wear condition of critical components.
Emergency Handling
Handling measures in case of an abnormality: Immediately switch to low speed or stop pumping; troubleshoot the cause of the fault based on the alarm information; if necessary, perform a reverse pumping operation.
Conclusion
Adjusting the pumping speed of wet-mix shotcrete machines is a technical task that requires a combination of theory and practice. Operators should, based on their thorough understanding of equipment performance, flexibly adjust settings according to specific construction conditions to strike the optimal balance among quality, efficiency, and equipment protection. With the advancement of intelligent technologies, modern wet-mix shotcrete machines now feature automatic optimization of pumping parameters; however, human expertise remains an essential factor in ensuring construction quality. It is recommended that operators continuously enhance their skills through systematic training and experience accumulation, thereby providing reliable technical support for construction projects.
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