Analysis on Performance Parameters and Safety Control Key Points of Main and Auxiliary Winches of Rotary Drilling Rig

Difference between functional orientation of main and auxiliary winch and industrial application

The main winch and auxiliary winch of rotary drilling rig are the core hoisting actuator of equipment pile foundation construction. The two have clear division of work and adapt to different construction conditions. They are the key components to ensure the efficient promotion of drilling, lifting, hole cleaning and auxiliary lifting operations. As the core working mechanism of the equipment, the main winch is mainly responsible for the lifting operation of core weights such as drill pipe, drilling tools and counterweight, serving the main hole forming process in the whole process. It is suitable for high-strength construction scenes such as deep hole drilling and large-tonnage drill lifting, directly determining the construction depth and core operation efficiency of the drilling rig. The auxiliary winch belongs to the auxiliary operation mechanism and does not participate in the main hole construction. It is mainly used for hoisting the pile casing, auxiliary handling of construction accessories, cleaning of sundries at the orifice and other lightweight auxiliary operations. With lower working load and more flexible operation frequency, it can effectively compensate for the short plate of the main winch function and adapt to the diversified auxiliary operation requirements of the pile foundation construction site. The two cooperate to ensure the orderly implementation of the pile foundation construction.

Main and auxiliary winch lifting force parameter fitting and control points

Hoisting capacity is the core bearing index of the winch, which is directly related to the construction bearing capacity and operation safety of the rotary drilling rig. The parameter design of the main and auxiliary winches meets the different construction load requirements. The hoisting capacity of the main winch is large and the upper limit of bearing capacity is high. It is required to match the maximum weight of drilling tools of the drilling rig, absorption resistance of deep-hole mud and other comprehensive loads. The rated hoisting capacity specification shall be strictly observed during the construction. It is strictly prohibited to lift the drilling tools under overload and forcibly lift the drilling tools to avoid such faults as wire rope fracture, winch gear wear, frame deformation, etc. The rated lifting force of the auxiliary winch is much lower than that of the main winch, which is only applicable to hoisting of light components. Overload operation shall be avoided during construction. It is strictly prohibited to replace the main winch to undertake lifting and lowering of drilling tools. In daily operation, it is necessary to regularly verify the pressure of winch hydraulic system and the wear state of steel wire rope, ensure the stability of lifting force output, eliminate the problems of virtual load and insufficient power, and avoid the potential safety hazard of heavy load from the source.

Operating speed matching principle of main and auxiliary winch

The operation speed directly affects the construction efficiency and operation stability of the pile foundation. The main and auxiliary winches are designed with different speeds according to the working conditions. The main winch focuses on stability and controllability, with gentle lifting speed, which can accurately adapt to core processes such as drilling, lifting and unloading. Low-speed operation can effectively avoid problems such as shaking of drilling tools, collapse of hole wall and deflection of drill rod, so as to ensure hole forming accuracy. The speed can be properly increased under the working condition of no-load drilling of shallow hole, and the speed must be reduced and stabilized under the working condition of deep hole, heavy load and thick mud. The auxiliary winch focuses on the high efficiency of operation, with relatively fast operation speed. It is suitable for the fast hoisting, transfer and other auxiliary operations of light materials, without strict accuracy control. During the construction, the speed shall be adjusted in real time according to the load to avoid rapid acceleration, emergency start and stop, and to prevent the looseness, off-groove, abrasion aggravation and other problems caused by inertial impact.

Key Points of General Safety Control for Main and Auxiliary Winches

Winch system failure of rotary drilling rig is a high frequency safety hazard at the construction site, and standardized safety control is the key point of equipment operation, maintenance and construction control. Before operation, it is required to comprehensively check the tightness, abrasion degree and number of broken wires of the main and auxiliary winch wire ropes, and check whether the brake system, limiting device and hydraulic control system are sensitive and reliable. The failed accessories shall be replaced in time. It is strictly prohibited to operate the equipment with faults. In the operation process, strictly distinguish the operation functions of the two, and prohibit mixed use, overload and overspeed operation. In case of drill tool jamming and abnormal load, immediately shut down for troubleshooting, and forced pulling is prohibited. At the same time, it is required to regulate the operation of rope retraction and paying-off, ensure the wire rope is arranged neatly, and eliminate disordered rope, extrusion and winding problems. The winch bearing, gear and hydraulic oil circuit shall be maintained and lubricated regularly to adapt to the complex working conditions of the construction site, so as to continuously ensure the stable operation of the winch system and avoid mechanical failures and safety accidents.