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Operating Guide for Forward and Reverse Pump Switching of the Wet Spraying Vehicle
Release time:
2026-02-16
Source:
Author:
Summary:
The forward and reverse pumping function is an important operational feature of wet spray rigs. Properly mastering the switching method is crucial for handling pipe blockages, cleaning pipelines, and performing construction under special conditions. A standardized operating procedure not only ensures equipment safety but also effectively enhances construction efficiency.
I. The Basic Principle of the Forward and Reverse Pump Function
The reverse-pumping function works by reversing the oil flow direction in the hydraulic system, causing the conveying cylinder piston to move in the opposite direction and thereby enabling reverse concrete delivery. This function is primarily used in the following scenarios: clearing blockages in pipelines; cleaning pipelines at the end of construction; achieving precise control during construction in special areas; and performing essential operations during equipment maintenance and upkeep.
Modern wet spray carts are typically equipped with electro-hydraulic control systems that use solenoid valve assemblies to achieve rapid switching of hydraulic oil circuits, ensuring the timeliness and reliability of forward and reverse pump transitions.
II. Specific Steps for the Switching Operation
Preparatory work
Before switching between forward and reverse pumping, the following preparatory work must be completed:
1. Confirm that the equipment is operating stably and that all system parameters are normal.
2. Verify that the information displayed on the operation interface is complete and accurate.
3. Ensure the safety of personnel around the equipment during the switchover process.
4. Observe the pressure gauge reading and confirm that the system pressure is within the safe range.
Switching operation procedure
The standardized switching operation should follow these steps:
1. First, reduce the pumping speed to bring the system into a low-speed operating state.
2. Press the reverse-pump function button or toggle the switch.
3. Keep the pump running in reverse for 2-3 cycles to ensure thorough backflow of concrete within the pipeline.
4. Observe pressure changes and confirm the effectiveness of the back-pumping operation.
5. To resume normal pumping, simply operate the switch again.
Key operational points
During the switching process, pay special attention to the following: Perform the switching action decisively and avoid pausing at any intermediate position; closely monitor any changes in the operating sounds of the equipment; observe the fluctuations on the pressure gauge; and keep a close eye on the discharge condition of the concrete.
III. Switching Strategies Under Different Operating Conditions
Clogged pipe treatment
When a pipe blockage occurs and immediate action is required:
1. Immediately stop the main pump from running.
2. Quickly switch to reverse pumping mode
3. Keep the reverse pump running for 3-5 strokes.
4. Observe the pressure drop situation.
5. Alternate between forward and reverse pumping operations until the blockage is cleared.
Pipeline cleaning
When cleaning the pipeline after construction is completed:
1. First, switch to reverse pumping mode and run.
2. Pump the remaining concrete inside the pipeline back into the hopper.
3. Use the cleaning ball to clean the pipeline.
4. Repeatedly switching between forward and reverse pumping ensures thorough cleaning.
Fine construction
Precise control during construction in special areas:
1. Use jog mode for micro-switching.
2. Precisely adjust the material quantity by precisely controlling the number of switching strokes.
3. Coordinate with the boom’s movements to achieve precise spraying.
4. Maintain a steady switching rhythm.
IV. Operational Precautions
Safety precautions
To ensure operational safety, the following must be noted:
1. Before switching, confirm that the equipment is stable and the legs are securely supported.
2. Operators must be familiar with the equipment’s performance parameters.
3. It is strictly prohibited to forcibly switch over when the system pressure is abnormal.
4. Pay attention to the surrounding environment of the equipment to ensure operational safety.
Key points for equipment protection
Pay attention to equipment protection during operation:
1. Avoid hydraulic shock caused by frequent and rapid switching.
2. Control the switching frequency to prevent system overheating.
3. Pay attention to changes in oil temperature and adjust operations accordingly.
4. Regularly inspect the wear condition of the switching mechanism.
Fault prevention
Prevent failures through standardized operations:
1. Maintain hydraulic oil cleanliness to meet the required standards.
2. Regularly check the operating status of the solenoid valve.
3. Pay attention to system pressure stability.
4. Promptly detect and address abnormal situations.
V. Troubleshooting Common Issues
Switch is unresponsive.
When the switching response is sluggish:
1. Check the solenoid valve’s power supply and signal lines.
2. Check whether the hydraulic system pressure is normal.
3. Check whether the control oil circuit is unobstructed.
4. Troubleshoot control system program issues
Large switching impact
Addressing the impact issue during the switching process:
1. Adjust system buffer parameters
2. Check whether the accumulator pressure is normal.
3. Optimize the switching speed control curve
4. Check whether the hydraulic oil viscosity is appropriate.
Unable to switch
When a complete inability to switch occurs:
1. Check whether the emergency stop device has been reset.
2. Confirm that the operation mode selection is correct.
3. Troubleshoot control system faults
4. Check whether the mechanical connections are normal.
VI. Maintenance and Care Requirements
Daily inspection
Inspection items to be performed per shift:
1. Check the response speed of the switching operation.
2. Listen for any unusual noises during the switching process.
3. Check the hydraulic system for leaks.
4. Confirm that the control signal transmission is normal.
Regular maintenance
Maintenance work performed according to the prescribed cycle:
1. Clean the solenoid valve assembly monthly.
2. Inspect and replace worn switching mechanisms every quarter.
3. Semi-annual inspection of the control system program
4. Annual comprehensive overhaul of the hydraulic system
Fault Warning
Establish a comprehensive early warning mechanism:
1. Record changes in switching operation times
2. Monitor the pressure fluctuations in the system.
3. Analyze hydraulic oil contamination data
4. Track changes in device usage performance
Conclusion
The operation of switching between forward and reverse pumping on wet spray trucks is an essential skill in equipment operation, and operators must be thoroughly familiar with its principles and methods. By following standardized operating procedures, conducting comprehensive maintenance and servicing, and promptly addressing any malfunctions, we can ensure that the equipment remains in optimal working condition at all times. It is recommended that construction companies strengthen operator training, establish standard operating procedures, and regularly organize skill assessments to continuously improve the level of equipment utilization. At the same time, it is important to pay close attention to the collection and analysis of equipment operational data, continuously optimize operating processes, and provide reliable technical support for construction projects.
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Address: Jinrong Tongxin International Industrial Park, Changsha High-tech Zone
Loudi Base:Hunan Haoda Heavy Industry Technology Co., Ltd.
Address: Loudi Avenue, Loudi High-tech Industrial Development Zone, Lianyuan City, Loudi City, Hunan Province
Telephone:400-186-0868
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