Support reaction force of multistage gear bearing in shearer cutting part
Fig. 1 (a) and (c) respectively show the dynamic reaction curve of the front and rear bearing 1 of the […]
Fig. 1 (a) and (c) respectively show the dynamic reaction curve of the front and rear bearing 1 of the […]
In dynamic modeling, the cutting part of shearer is divided into two parts: transmission system and rocker box. The transmission
Fig. 1 (a) and (c) show the dynamic meshing force curves of the front and rear gear pair 1 of
Dynamic modeling is the basis of gear system dynamics research. From the perspective of gear dynamics, the cutting part of
Dynamic load is the direct cause of vibration and fatigue failure of transmission system. Analyzing the dynamic load of each
Shearer cutting part is a multi-stage gear transmission system supported by rocker box, which has many parts and complex structure.
Involute gear has the characteristic that the center distance changes while the transmission ratio remains unchanged, so the center distance
Based on the multi-body dynamics commercial software ADAMS simulation platform and considering the dynamic characteristics of the rocker box and
Figure 1 shows the comparison of the center motion track of the driving and driven gears of the front and
The research on gear dynamics of shearer cutting part started late at home and abroad, and the main achievements were
When shearer cuts coal, the rocker box will produce complex three-dimensional dynamic deformation under the joint action of internal and
Profile modification is to modify the helical angle or axial profile of the gear according to the predetermined law according
The main research contents are as follows: 1) The natural vibration characteristics of the coupled system are solved and the
Profile modification is to remove trace material from the tooth surface along the direction of tooth height, so as to
The bending fatigue test was designed and completed according to GB / T 14230-1993. In the bending fatigue test, according
Firstly, the natural vibration characteristics of the coupled system are solved. By simplifying the dynamic equation of multi-stage gear transmission
The design of gear system is not limited to the static strength check, but the important content is to consider
Multi stage gear transmission is a system composed of cutting motor, cutting transmission system and cutting roller, which is used
It should be noted that the dynamic substructure method is mainly convenient to establish the coupling dynamic model of the
Mode (including natural frequency and mode) is the inherent property of multi degree of freedom system. It describes the natural
Choy et al established the dynamic model of the transmission system by using the transfer matrix method and the dynamic
With the deepening of research and the improvement of computer performance, the research object of gear system dynamics has experienced
Bearing is a standard part widely used in all kinds of mechanical equipment, and it is the key component to
There are some problems in gear meshing excitation modeling ① The time-varying meshing stiffness and static transmission error are scalars
The cutting motor of shearer is squirrel cage three-phase asynchronous motor. The mechanical characteristics of cutting motor refer to the
As an elastic mechanical system, gear system produces vibration and noise problems under dynamic excitation. The dynamic excitation is the
The drum bears the function of cutting coal. The load on the drum has an important impact on the stress
Gear system is the most widely used transmission system in all kinds of mechanical equipment. Its mechanical behavior and working
Gear shaft is a solid or hollow cylindrical member with variable cross-section, and its finite element model can be established
Shi uses the software perdynamic (PD), which is used to analyze the crack propagation in the fracture of engineering materials.
The cutting part is the core part of the shearer’s function of cutting coal and loading coal. It is mainly
According to Newton’s second law, the dynamic equation of the system is established as follows Where I (I = R,
Huang believes that the dispersion of fatigue crack growth behavior should be accurately characterized in the structural integrity assessment based
Coal is China’s basic energy and important chemical raw materials. Coal industry is an important basic industry related to national
The internal excitation of planetary gear train is complex, and the power transmission path changes with the turnover of planetary
Heavy duty gear is the core component of large equipment transmission, which is widely used in many industries such as
Firstly, the finite element model of rocker box is established in ABAQUS, and its mass matrix and stiffness matrix are
The function of bevel gear is to transmit the motion and power between two intersecting axes. Similar to cylindrical gears,
By using the lumped parameter method, a 12 degree of freedom dynamic model of a pair of fixed axis gears
From the point of view of the purpose of designing super large modified gear (medium hard tooth surface and medium
Taking any slice gear pair in Fig. 1 as an example, the calculation method of micro element meshing force FIJ
According to the characteristics and cutting pattern of hobbing super large modified gear, the maximum wear of hob occurs at
As shown in the figure is the schematic diagram of the large deformation gear model. In this model, the main
It can be seen from practice that in hobbing large modulus multi tooth number gears, because of the large cutting
The traditional gas carburizing method uses a single liquid (such as kerosene) carburizing to control the surface carbon content and
It is known that the transmission mechanism of an automobile engine is a closed bevel gear transmission mechanism with 90
The principle of axial displacement method: (1) when the hob moves along the cutter bar, the thread of cutter teeth
In the optimization design of bevel gear transmission mechanism, the minimum volume sum of bevel gear pair is taken as
In heavy mining and building materials machinery, a large number of large gear pairs with open drive are used. The
When the standard hob is used to hobbing the super large modified gear, the phenomenon of non involute tooth profile
Mining machinery, transportation machinery and other low-speed heavy-duty gear, require the use of high reliability carburized hardened gear after grinding.
Firstly, the difference Δ n (that is, Δ n = N-N) between the minimum number of effective axial cutter teeth
In order to improve the load-bearing capacity and service life of low-speed, heavy-duty, large modulus, multi tooth number and large
Due to the requirements of structure and economy, the planetary carrier must be designed with the structure of thin left
In Figure 1, at the cutting end of the hob, although the hob teeth beyond the meshing length LM do
In the early stage of new product development, there must be sufficient simulation analysis and calculation and a large number
The analysis and calculation of the cutting edge length of hob is not important for the gear with medium and
The main components of planetary transmission include sun gear, planetary gear, ring gear, planetary carrier, pin shaft and bearing, which
The practice shows that using standard hob to gear hobbing this kind of gear with incorrect method may cause abnormal
Asteroid gear has compact structure and high reliability. It is usually used for reducing transmission in industrial fields (rotary, walking,