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Analysis of the Standard Stroke Range for the Wet Spray Carriage Delivery Cylinder
Release time:
2026-02-06
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Summary:
The delivery cylinder of the wet spray carriage is the core actuating component of the entire pumping system. Its stroke length directly affects the equipment’s pumping efficiency, outlet pressure stability, and concrete homogeneity. Understanding the standard stroke range of the delivery cylinder is of great significance for equipment selection, performance evaluation, and maintenance.
I. Definition and Function of the Delivery Cylinder Stroke
The delivery cylinder, also known as the concrete cylinder or pumping cylinder, is the cylinder in a wet spray rig that comes into direct contact with pre-mixed concrete and propels it forward. A piston reciprocates inside the cylinder, generating pumping pressure. The stroke refers to the distance traveled by the piston from its starting point to its endpoint during a single reciprocating motion.
Its core functions are mainly reflected in two aspects:
1. Determining the Single-Stroke Displacement: Under the premise that the cylinder bore remains fixed, the stroke length directly determines the volume of concrete delivered per cycle. The longer the stroke, the greater the amount of concrete pushed in each stroke.
2. Influence of Pumping Pulse: The stroke and pumping frequency together determine the pulsating characteristics of the material flow at the outlet. An appropriate stroke helps create a relatively stable concrete flow and reduces fluctuations in the quality of the sprayed surface.
II. Data Analysis of Standard Travel Range
According to the technical parameters of wet spray carts from current mainstream manufacturers, the stroke range of the delivery cylinder shows a clear concentration trend, primarily centered around the value of 1000 mm.
Standard stroke: 1000mm
Statistical analysis of multiple models reveals that 1,000 mm is currently the most widely used delivery cylinder stroke. For example, the SPJ3017 specialized chassis wet spray machine from Sany Heavy Industry, the QZHP-3016B from Qingke Heavy Industry, and the GHP16D truck-mounted concrete wet spray unit from Henan Gengli all specify a delivery cylinder stroke of **1,000 mm**. This indicates that this dimension has become a benchmark design within the industry.
Other itinerary specifications
Beyond the mainstream range, there also exist some alternative designs. For example, the XZPS25 wet spray carriage from Xin Zhu Zhi Zhuang features a delivery cylinder stroke of **900 mm**. Meanwhile, certain wet-spray devices that focus on specific operating conditions or employ different pumping principles—such as the HKP-25SR multi-functional wet-spray machine—adopt a stroke length of **1000 mm**. These differences are typically driven by the need to meet particular pumping pressure requirements, optimize the overall equipment layout, or gain a competitive edge in the market through differentiation.
In summary, the standard stroke range for the conveying cylinder of wet spray carts can be defined as between 900 mm and 1000 mm, with 1000 mm being the overwhelmingly dominant specification.
3. Co-design of the itinerary and key parameters
The stroke of the delivery cylinder is not set independently; rather, it is the result of coordinated matching with parameters such as cylinder bore and engine power, collectively determining the overall performance of the equipment.
Matching with Cylinder Bore: The stroke length and cylinder bore together determine the displacement volume of the delivery cylinder. Common matching patterns include “large bore with standard stroke” or “standard bore with standard stroke.” For example, equipment with a cylinder bore of Φ180mm is typically paired with a 1000mm stroke, while equipment with a cylinder bore of Φ160mm is similarly matched to a 1000mm stroke. This matching approach aims to optimize the single-displacement volume relative to system pressure, striking a balance between efficiency and reliability.
Relationship with Drive Power: A longer stroke and a larger cylinder bore mean that greater driving force is required to move the piston. Consequently, wet spray trucks equipped with a 1000mm stroke typically feature higher main motor or engine power ratings to meet the pumping system’s demands for both pressure and flow rate. For example, equipment with a pumping capacity of 30 m³/h usually has a main motor power rating ranging from 55 kW to 90 kW.
IV. Impact of Itinerary Selection on Construction
Selecting the appropriate stroke length for the conveying cylinder is directly related to the efficiency and effectiveness of the construction site.
Construction efficiency: Under the same pumping frequency, the longer the stroke, the greater the theoretical pumping capacity typically is, and the higher the construction efficiency tends to be. This is one of the reasons why projects aiming for high efficiency often opt for equipment with a 1000mm stroke.
Concrete homogeneity: A well-designed stroke mechanism helps reduce pulsation during pumping, thereby ensuring the stability of the concrete flow. This is crucial for minimizing rebound and guaranteeing a dense, smooth sprayed layer.
Equipment suitability: For tunneling projects that require high jetting heights (e.g., exceeding 15 meters) and long conveying distances, equipment equipped with standard or longer-stroke delivery cylinders is often necessary to ensure sufficient outlet pressure to overcome resistance.
V. Maintenance and Selection Recommendations
Maintenance Focus: Regardless of the length of the operation, the wear resistance of the inner wall of the delivery cylinder and the piston head is central to maintenance. Wear conditions should be checked regularly to prevent internal leakage, which can lead to reduced pumping power and decreased efficiency.
Equipment Selection Considerations: When selecting a wet spray truck, the stroke of the delivery cylinder should not be considered in isolation. Instead, it should be viewed as a key dimension of the pumping system and evaluated in conjunction with the theoretical displacement (e.g., 16 m³/h, 25 m³/h, 30 m³/h), the outlet pressure (typically around 8 MPa), and the overall power configuration of the machine, ensuring that the equipment’s performance matches the project’s requirements.
Conclusion
The standard stroke range for the conveying cylinder of wet spray rigs typically falls within the narrow band of 900 mm to 1,000 mm, with 1,000 mm being the design standard widely adopted across the industry. This specification has been validated through extensive engineering practice and represents one of the optimal balances among pumping efficiency, pressure stability, component lifespan, and overall machine layout. A deep understanding of stroke parameters and their relationship to the overall machine performance will facilitate more scientific equipment procurement and operation & maintenance management, thereby ensuring the quality and schedule of concrete spraying support projects such as tunnels and slope stabilization works.
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