Comprehensive Technical Upgrade for the Hydraulic System of Rotary Drilling Rigs: In-depth Adaptation to Working Conditions and Consolidating the Core Foundation for Stable Equipment Operation and Control

At present, the construction of domestic infrastructure pile foundation projects continues to accelerate, and the geological conditions for key projects such as high-speed rail bridges, urban rail transit, high-rise buildings, and wind power foundations are becoming increasingly complex. Composite strata such as soft soil, sand and gravel, weathered rock, and hard rock alternate, posing extremely high standards for the continuity, drilling accuracy, and operational reliability of rotary drilling rigs. The hydraulic system, as the power core and control center of the rotary drilling rig, directly determines the drilling torque, pressurization power, action response, and overall collaborative operation capability of the equipment. Traditional and outdated hydraulic systems commonly suffer from common problems such as large pressure fluctuations, lagging motion and abnormal noise, delayed control feel, high temperature oil leakage, and insufficient stability under heavy load conditions. Long term high-intensity construction can easily lead to problems such as drilling jamming, burying, hole deviation, and frequent shutdown maintenance, which not only drag down the overall efficiency of pile foundation construction, but also significantly increase equipment operation and maintenance costs and construction rework losses. Based on the current development needs of the fine, efficient, and low failure industry in pile foundation construction, targeted promotion of the specialized technical upgrade of the hydraulic system of rotary drilling rigs, focusing on optimizing and improving the two core dimensions of operational stability and precise control, has become a necessary measure for improving the quality and efficiency of engineering machinery, maintaining long-term value of equipment, and adapting to complex geological construction.

The construction conditions in the industry are strict, and the operational shortcomings of old hydraulic systems are becoming increasingly prominent

Nowadays, pile foundation construction projects generally have the characteristics of tight schedule, high load, diverse working conditions, and long continuous operation time. The rotary drilling rig is in a high-intensity working state of heavy load and pressure, frequent start stop, alternating forward and reverse drilling, and high and low torque switching all year round. The hydraulic system is subjected to high-pressure impact and load alternating tests for a long time. The basic hydraulic system that was standard in the early days was limited by traditional valve group configuration, pipeline layout, filtration accuracy, and heat dissipation design. It could still cope with a single simple formation, but faced with complex hard rock, deep pile foundation, and long-term continuous drilling conditions, various operational defects continued to be exposed. During the operation of the equipamento, it is easy to encounter problems such as fluctuating power output, asynchronous lifting and lowering of drill rods, and significant shaking of rotation start stop, which directly affect the verticality of the borehole and the smoothness of the construction; At the same time, frequent malfunctions such as rapid temperature rise of hydraulic oil, aging and leakage of seals, wear and blockage of valve cores, and imbalance of system pressure relief have led to frequent equipment shutdowns and maintenance, disrupting the continuous pace of construction. In addition, the control logic of the old hydraulic system is simple and crude, the operation feel is stiff, and the response delay is obvious. It is difficult for operators to fine tune, and the probability of human operation errors increases, making it difficult to meet the precise drilling requirements of high standard pile foundation construction. The upgrading and transformation of hydraulic system technology is urgent.

Upgrading the main pump power core to solidify the long-term stability of system pressure output

The hydraulic main pump is the power source of the hydraulic system of the rotary drilling rig. The output pressure and flow stability of the pump body directly determine the continuous operation power of the whole machine, and are also the primary upgrade points to improve system stability. The traditional quantitative piston pump has a constant power output and cannot automatically match torque and flow rate according to geological hardness. When drilling under heavy load, there is a sudden increase in pressure, and energy waste is severe when idle. In addition, long-term high-pressure operation is prone to problems such as internal wear of the pump body, pressure attenuation, and excessive flow pulsation. The core of the technological upgrade has been replaced with a large displacement high-frequency response electronically controlled variable plunger pump. With the support of precise displacement adaptive adjustment technology, the output flow rate and working pressure can be dynamically matched in real time according to the softness and hardness of the formation and the size of the drilling load, achieving adaptive switching between heavy load torque increasing pressure and light load energy-saving pressure stabilization. After the upgrade, the fluctuation of the main pump pressure output has been significantly reduced, completely eliminating the problem of fluctuating power during drilling. The equipamento can smoothly and continuously output power under heavy load conditions such as hard rock breaking and deep hole pressurization, without pressure drop, stall, or power interruption. At the same time, optimize the wear-resistant materials and precision flow distribution structure inside the pump body, improve the pump body’s wear resistance, impact resistance, and high temperature resistance, extend the service life of core components, and build a long-term stable operation foundation for the hydraulic system from the power source, reducing downtime and maintenance caused by pump body failures.

Intelligent optimization of the main control valve group, accurately improving the sensitivity of equipment operation and control

The main control valve group serves as the action control center of the hydraulic system of the rotary drilling rig, directly controlling all operational actions such as drill rod rotation, pressure lifting, drilling bucket opening and closing, mast adjustment, etc. The control accuracy and response speed of the valve group determine the overall control feel and construction accuracy of the machine. The traditional old-fashioned split type manual valve group has complex pipelines, large valve core clearances, and delayed directional response. When operating with multiple actions, it is easy to encounter problems such as action interference, asynchronous coordination, and start stop shaking. The difficulty for operators to control is high, and the precision of fine adjustment is insufficient, which can easily cause quality problems such as hole deviation and hole wall disturbance. The core of the controllability upgrade adopts an integrated electro-hydraulic proportional multi way valve group instead of traditional manual valves, simplifying the redundant layout of hydraulic pipelines, reducing pipeline pressure loss and leakage points, and relying on electro-hydraulic proportional control technology to achieve micro movement of the operating handle and precise linear output of hydraulic flow. The amplitude of the operator’s handle operation is precisely matched with the speed of the equipamento movement, with smooth start stop without impact, sensitive fine adjustment without delay, smooth and coherent connection of drill pipe rotation, drilling pressure, lifting and unloading of soil, completely eliminating common control problems such as action jamming, shaking, and lagging. At the same time, optimize the valve group reversing buffer structure to avoid pressure shock during action switching, which not only improves the control feel and construction accuracy, but also effectively protects mechanical structures such as drill rods and masts, reducing equipment structural losses.

Upgrade hydraulic cooling and filtration system, strictly control high temperature impurities to avoid operational failures

High temperature and overheating of hydraulic oil, as well as excessive impurities in the oil, are the two core causes of frequent hydraulic system failures and decreased stability in rotary drilling rigs. They are also key supporting links that cannot be ignored in upgrading and renovation. Under the continuous high-intensity operation of pile foundation construction, the traditional small radiator has insufficient heat dissipation efficiency, and the hydraulic oil temperature rises rapidly. High temperature will accelerate the deterioration of hydraulic oil, aging and failure of seals, and leakage of valve cores, directly shortening the service life of the hydraulic system; Old and simple filtering devices have low accuracy and cannot effectively filter impurities such as construction dust and metal wear debris. Impurities enter the valve group and pump body, which can easily cause wear and blockage of precision components, leading to pressure imbalance, malfunction, and other faults. Technological upgrades are synchronized with the increase in size of high-efficiency plate fin hydraulic radiators, paired with intelligent temperature controlled forced cooling fans. The cooling speed is automatically adjusted according to the hydraulic oil temperature, achieving real-time temperature control of the oil temperature and eliminating the problem of high temperature overheating. Synchronize and upgrade the multi-stage precision filtration system, install triple filtration devices including oil suction filtration, high-pressure pipeline filtration, and return oil precision filtration, intercept internal impurities in the oil with high precision, maintain the cleanliness of the hydraulic oil to meet standards, and reduce the wear of precision hydraulic components. By upgrading the heat dissipation and filtration system, common faults such as leakage, jamming, and pressure relief can be avoided from the perspective of the operating environment, ensuring the long-term stable operation of the hydraulic system.

Optimization of sealed pipelines and accessories, long-term prevention and control of leakage, and extension of system service life

Aging and leakage of hydraulic pipelines, wear and tear of seals, and oil leakage are the most common problems in the hydraulic system of rotary drilling rigs. They not only cause waste of hydraulic oil and pollution on the construction site, but also lead to system pressure loss, insufficient power, and frequent oil replenishment and maintenance, increasing construction costs. Traditional ordinary rubber seals have poor resistance to high pressure, high temperature and aging, and are prone to deformation and damage under high-pressure alternating working conditions; The wall thickness of old pipelines is insufficient, and the welding process of joints is simple. Long term high-pressure vibration is prone to pipeline cracking and joint oil leakage problems. Upgrade and renovate the high-pressure wear-resistant seamless hydraulic pipeline comprehensively, optimize the pipeline layout, reduce pipeline bending, vibration and friction points, adopt integrated forging high-strength pipeline joints, and improve the sealing and anti vibration ability of pipeline connections. Replace all imported high-strength polyurethane sealing components that are resistant to high and low temperatures, high pressures, and are suitable for high-pressure and high-temperature operating conditions of the system. They are not easily aged or deformed under long-term alternating loads, and the seal does not fail. At the same time, adding shock-absorbing fixed buckles to the pipeline can reduce the wear and tear of the pipeline and joints caused by equipment operation vibration, thoroughly cure the stubborn problem of hydraulic leakage from the details, reduce the frequency of daily operation and maintenance and consumables costs, and ensure the long-term stable closed-loop operation of the hydraulic system.

Electronic control collaborative matching and debugging, achieving precise adaptation of hydraulic power and control logic

After the hardware upgrade is completed, the coordinated and refined debugging of the electronic control system is a key finishing step to ensure the stability and controllability of the hydraulic system meet the standards. If the hardware upgrade does not match the electronic control parameters, it is prone to problems such as power output disorder and uncoordinated control feel. Relying on professional hydraulic debugging and testing equipment, we accurately calibrate core data such as main pump pressure parameters, valve group flow ratio, and action response delay. Combined with different geological construction conditions, we preset multiple hydraulic power modes for soft soil, sand layer, and hard rock. With just one click switching, we can automatically adapt to the corresponding drilling pressure and torque output. Synchronize and optimize the operation of the electronic control program, optimize the transmission speed of the handle signal, eliminate the delay deviation of the control signal, and ensure that every operation command of the operator can be quickly and accurately transmitted to the hydraulic actuator. Through collaborative debugging of software and hardware, hydraulic power output, action control response, and adaptive adjustment of working conditions are highly compatible, achieving stable and durable heavy-duty construction, as well as precise and efficient fine control, fully adapting to various pile foundation construction needs.