Earth pressure balance shield machine Lord drive structure design and analysis

Earth pressure balance shield machine Lord drive 2020 - structural design analysis 12 - 13 yun Yang li qiu, Jinan heavy industry co. , LTD. ) Abstract: the main drive is the key to the earth pressure balance shield machine core components, in order to meet the construction needs and enhance the adaptability of shield machine, the main drive of the main bearing, small gear, reducer, driving power, sealing and lubrication, main drive boxes, and other aspects to carry on the design analysis, and with a bid of construction as an example, determines the corresponding main drive structure and main parameters. Keywords: earth pressure balance shield machine; Main drive; Design and analysis of shield machine must be according to the tunnel engineering geology, hydrology and section size, construction environment and the requirements for type selection design of earth pressure balance shield machine Lord drive used to support the knife dish and provide the knife dish excavation excavation in construction process and control the required torque. According to the geometric design of shield machine, tool configuration and cutter structure, formation conditions and corresponding calculate and determine the parameters such as thrust, cutterhead torque and rotational speed, for the earth pressure balance shield machine Lord drive structure provides the basis for design and analysis. 1 main drive structural design analysis of earth pressure balance shield machine Lord drive mainly includes the drive power, speed reducer, gear pair, main bearing, sealing and lubrication, main drive gearbox, etc. , drive path for drive power & rarr; Reducer & rarr; Pinion & rarr; Main bearing & rarr; Drive disc & rarr; The knife dish, a big transmission torque, the complex structure is compact, high control precision, etc. Shield machine construction properties determine main drive must have high reliability and good synchronism and good operating performance, therefore, need to carry on the design of its key components and structure analysis. Earth pressure balance shield machine Lord drive structure mainly includes: (general design process 1) Overall structure design, determine the main drive main structure; （ 2) The main transmission parts calculation, selection and checking; （ 3) And the ring design of the drive box; （ 4) The sealing and lubrication system design; （ 5) Other structural design. 1. 1 main bearing of main bearing long-term work under overload, variable load conditions, and at the same time carry axial, radial and overturning moment, require high reliability and long service life, the more USES the combination of three rows of cylindrical roller structure, its dynamic ring also as a big ring gear and small gear meshing transmission. According to different conditions and the proportion, the preliminary selection of cylindrical roller pitch diameter, calculate the equivalent dynamic load, in order to achieve the basic rated life requirements, calculation of equivalent static load, the control of the main bearing permanent deformation, contact stress check finally. 1. 2 small pinion gear is usually involute spur gears, and the main bearing of large gear ring gear pair, according to the standard and manual geometry calculation, strength and life, determine the main parameters, a detailed design. 1. 3 because of the speed ratio, torque of reducer and space constraints, deceleration pause with planetary gear reducer, according to the working conditions of reducer, reducer for strength checking, heat balance, the radial load respectively, etc. Figure 1 a frequency conversion motor torque diagram 1. 4 drive power although in recent years, a permanent magnet synchronous drive, electric hydraulic hybrid, but hydraulic motor drive and frequency conversion motor drive is still the main drive existing main drive power, motor drive, small volume, low efficiency, the follow-up equipment is often used in small and medium-sized shield, frequency conversion motor drive large volume, high efficiency, less subsequent equipment, is often used for large diameter shield, from the developing trend of energy conservation direction and, frequency conversion motor drive mode is the development direction of cutter disc drive in the future. Frequency conversion motor drive, for example, in the process of design selection, according to the knife dish rated speed, rated torque, to erase the torque parameters, such as to determine the frequency conversion motor power, rated torque, quantity and constant torque and constant power range, a frequency conversion motor speed, power and torque curve is shown in figure 1. 1. 5 sealing and lubrication, according to the main drive structure size and working conditions for the selection of sealing device configuration and the selection of lubricating medium calculation, sealed to prevent sliding surface wear and sundry intrusion, ensure that the main drive in good lubrication condition. 1. Six main drive gearbox main drive can be achieved after the main components of main drive box structure design, main drive gearbox design must ensure that it has sufficient strength and rigidity. 1. 7 other main drive structured design should also do a small gear rolling bearing type selection and layout, selection of bolt and piping design, wear-resisting grid layout design, and test equipment, etc. 2 case analysis some construction blocks cutting wheel rotation speed and torque as shown in table 1. Table 1 cutting wheel rotation speed and torque parameter table 2 main parameter list through to the main components of main drive calculation and checking, determine the main drive main parameters are shown in table 2. 3 conclusion of shield machine Lord drive structure is complex, requires repeated adjustment, structure design, through the combined with control systems, fluid systems, and tested in actual construction, analysis and summary, to make the structure more optimization, selection of calculation is more accurate and reasonable. Source: 'modern manufacturing technology and equipment' 09, 2018