Hundred editions of “Mining Machines” magazine are the presentation of development of the Polish mining industry mechanization
PENAR Z.

Work safety during longwall shearers operation
MAZUR M.

Development of the longwall shearers designs for Polish and foreign customers
KOSTEMPSKI M., SKRZYPIEC A.

Experience from an operation of the KSW-1140E longwall shearers with an electric drive supplied with 3.3 kV voltage, manufactured by the Zabrzanskie Mechanical Works JSC
GIL E.,  GASZKA J.

Technical and economical factors which determine the use of production potential of the longwall face
JASZCZUK M.

Influence of the rock cutting speed on the cutting bits life
JONAK J.

Worm cutting drums equipped with disk tools
KRAUZE K.

High energy impact on powered roof supports
SIKORA  W.

Impact load identification
HOLNICKI-SZULC J., WIKŁO M.

Trial of identification of dynamic rock mass impact on powered roof supports using Finite Elements (FEM) and Finite Difference (FDM) Methods
KWAŚNIEWSKI M., WINKLER T. SZYGUŁA M., TOKARCZYK J.

Concept of the powered roof support adapted for operation in the rock mass tremor hazard conditions
SZYGUŁA M., MAZUREK K., HOLNICKI-SZULC J., MRÓZ A.

Possibilities and results of suppression of the kinetic energy impulse, transferred to the lemniscate support unit by surrounding rock before the relief valve start to operate
PTAK J., LOSIAK S.

New generation ploughs for the seams of small and medium thickness
PASCHEDAG U., BURZAN K., JUSCZYK H.

KOMAG Mining Mechanization Centre – Notified Body No 1456
MEDER A., GAWOL J., KACZMARCZYK J.





Hundred editions of “Mining Machines” magazine are the presentation of development of the Polish mining industry mechanization
PENAR Z.

S u m m a r y
The genesis of establishment and development of the technical magazine entitled “Mining Machines” edited by KOMAG Centre, the R & D organization, was pre- sented. Changes and reorganization of the technical and scientific base in the mining industry were dis- cussed. The changes concerned both the problems discussed in printed articles, its essential content as well as the graphic appearance and the content of editors board.




Work safety during longwall shearers operation
MAZUR M.

S u m m a r y
The present legal status as well as the safety regu- lations in the mining plants for using longwall shearers were presented. Hazards which may occur during longwall shearers operation were discussed including the safety conditions in mining plants as regards longwall shearers operation.




Development of the longwall shearers designs for Polish and foreign customers
KOSTEMPSKI M., SKRZYPIEC A.

S u m m a r y
The whole longwall shearers development process beginning from the shearers with hydraulic haulage drive to the shearers with electric haulage drive with frequency transformer installed on the machine was discussed.



Experience from an operation of the KSW-1140E longwall shearers with an electric drive supplied with 3.3 kV voltage, manufactured by the Zabrzanskie Mechanical Works JSC
GIL E.,  GASZKA J.

S u m m a r y
The experience from an operation of the KSW-1140E longwall shearer with an electric drive, supplied with 3.3 kV, manufactured by Zabrzanskie Mechanical Works S.A. was presented. The shearers of the KSW 1140E type, used in “Wesola” Colliery, meet the mine’s expectations and guarantee the production on the accepted level, after elimination of failures occurring in the first period of operation. Technical solutions used in the mechanical and electrical parts make a design of the shearer very successful.




Technical and economical factors which determine the use of production potential of the longwall face
JASZCZUK M.

S u m m a r y
Factors that influence the use of technical potential of longwall shearers, associated with its proper selection to the given natural conditions of the face, techno- logical process in the face as well as to the availability of machines and equipment that make a technological line face – shaft tank, were analyzed. An impact ot the mechanical system availability on the production rate was given on an example of the face equipped with the KSW/E-620 shearer. The readiness factor of the shearer and other components of longwall system was presented. The factors which determine the use of a theoretical shearer’s output were given on an example of KSW-500 shearer operational tests. The efficiency factor of technology, which determines a degree of the face production potential usage was discussed.





Influence of the rock cutting speed on the cutting bits life
JONAK J.

S u m m a r y
Problems associated with the cutting bits wear as regards the cutting speed as well as an impact of some rock properties on the process were discussed in relation to the cutting drums designing process.




Worm cutting drums equipped with disk tools
KRAUZE K.

S u m m a r y
Repeated interesting of Polish hard coal mines in disk tools caused a development of the prototype design of worm cutting drums equipped with disks by Processing and Transportation Mining Machines Department of AGH and Zabrzanskie Mechanical Works S.A. Designs of the cutting drums of that design for coal and hard coal interlayer cutting were presented on the background of existing designs. Special attention was paid to a discussion of advantages and disadvantages of disk tools in comparison to the presently used cutting bits.




High energy impact on powered roof supports
SIKORA  W.

S u m m a r y
Tasks of the roof support in longwall faces and types of dynamic phenomena in the mining industry as well as factors influencing bumps were presented. A use of powered roof support has the significant impact on bumps reduction in face as it improves supporting of the roof, reduces the bump hazard in the face and moving the hazard from longwall face to the near-longwall roadways. The roof support can also reduce bump effects due to a special design.




Impact load identification
HOLNICKI-SZULC J., WIKŁO M.

S u m m a r y
Further development of methodology for identification of load’s scenario formulated in Ref.10 (including non-linear effects due to local damages), causing measured structural deformations is presented. The intelligent sensor system monitoring load scenario and the corresponding damage (plastic yield, buckling and/or brittle crack) development can play the role of a black box allowing an after-accident-diagnosis.



Trial of identification of dynamic rock mass impact on powered roof supports using Finite Elements (FEM) and Finite Difference (FDM) Methods
KWAŚNIEWSKI M., WINKLER T. SZYGUŁA M., TOKARCZYK J.

S u m m a r y
In this paper we have presented a way of dynamic modelling of rock mass impact on supporting structures with the use of finite different and finite element methods. The finite difference method has been used to construct a numerical, laminar-block rock mass model. In this model we have simulated coal seam mining with caving in roof layers and a rock mass tremor. The results of computations (the distribution of roof vibration velocity) have been used, using finite element method, to dynamically load the canopy of  powered roof support.




Concept of the powered roof support adapted for operation in the rock mass tremor hazard conditions
SZYGUŁA M., MAZUREK K., HOLNICKI-SZULC J., MRÓZ A.

S u m m a r y
Aconception of powered roof support adapted for operation in bumping condition was discussed. New solutions that can eliminate disadvantages of the analyzed solutions were presented. These are the novelty solutions.





Possibilities and results of suppression of the kinetic energy impulse, transferred to the lemniscate support unit by surrounding rock before the relief valve start to operate
PTAK J., LOSIAK S.

S u m m a r y
The paper concerns the possibility of suppression of the kinetic energy, transferred by the lemniscate support unit by surrounding rocks, at the first stage of legs operation. It gives a condition of the kinetic energy suppression and equations for the support system operation. It results, from the equations, what kind of design and roadway parameters influence the support system operation which can suppress a kinetic energy transferred to the unit as an impulse. Given relationships were illustrated by exemplary calculations which represent the effects of the partial suppression of energy impulse.





New generation ploughs for the seams of small and medium thickness
PASCHEDAG U., BURZAN K., JUSCZYK H.

S u m m a r y
Present plough technique, currently used by DBT, was presented. The methods for designing and planning the plough faces were specified. The criteria for a selection of shield support as well as a control and automatics systems were discussed. The reference examples of use of ploughs of a new generation were given.






KOMAG Mining Mechanization Centre – Notified Body No 1456
MEDER A., GAWOL J., KACZMARCZYK J.

S u m m a r y
The Conformity Assessment System’s Bill specifies the organizations which participate in the process of the product assessment before its commercialization. The process of reaching the notified body No 1456 status by the KOMAG Mining Mechanization Centre was discussed as well as authorizations and procedures resulting from that notification.