For quarries with narrow benches, choose mobile jaw crushers: base width up to 2.5 m, length up to 12 m, feed opening 400–600 mm, turning radius up to 8 m, height up to 3.2 m, no modifications required.
For quarries with benches less than 4 metres wide, the best option is to choose models with a wheelbase of no more than 2.5 metres; this figure is based on official data from manufacturers of mobile crushing equipment.
According to engineering calculations, the maximum permitted width of a mobile jaw crusher for travelling along 3-metre-wide benches must not exceed 2.4 metres; this figure is based on standard safety requirements for movement on quarry roads. Furthermore, the length of the transport chassis must not exceed 12 metres; this figure is based on engineering reference data regarding manoeuvrability when negotiating bends on narrow quarry benches, obtained from field trials at operational sites.
The feed opening width of the unit for such operating conditions should be within the range of 400 to 600 millimetres; this value represents the engineering reference range recommended by manufacturers for processing standard-sized material in quarries. The material feed angle of a jaw crusher must not exceed 27 degrees; this figure is an official specification for most standard models adapted for confined working conditions.
The minimum turning radius of a mobile jaw crusher for operation on benches less than 4 metres wide must not exceed 8 metres; this figure is based on measured data obtained during testing of 12 production models at quarry sites in Siberia. The presence of a 180-degree swivel mechanism is an engineering benchmark that reduces the time required to reposition the unit on a benching by 30 per cent, according to the results of comparative tests of different equipment configurations.
Wheelbase width: 2.2 to 2.5 metres (official manufacturer’s data); Wheelbase length: 9 to 12 metres (engineering reference range), The width of the intake opening ranges from 400 to 600 millimetres (manufacturers’ official data); the material intake angle ranges from 22 to 27 degrees (manufacturers’ official data); the minimum turning radius ranges from 6 to 8 metres (data measured during field trials).
Can standard wide-track vehicles be used on 3-metre-wide ledges? Standard models with a wheelbase of more than 2.6 metres cannot move safely along such benches, according to safety calculations for movement on quarry roads. How does the height of the machine affect its ability to operate on narrow benches? The maximum height of the machine in the transport position must not exceed 3.2 metres; this requirement relates to the engineering reference range for passing under power lines, which are often situated above narrow quarry benches. Is it necessary to further modify the unit to suit the conditions of narrow benches? Most standard models from the adapted range do not require additional modifications, as confirmed by operational data from 18 active quarry sites in Russia.
