RU-2861362-C1 - DEVICE FOR MOVING CUTTING ELEMENTS OF MINING MACHINE

RU2861362C1RU 2861362 C1RU2861362 C1RU 2861362C1RU-2861362-C1

Abstract

FIELD: mining. SUBSTANCE: invention can be used in the creation of shearers for mining mineral seams of high strength and complex bedding according to hypsometry. A device for moving the cutting elements of a mining machine consists of right and left rotary gearboxes hinged at the edges of the machine body, equipped with augers and rods configured to transmit forces from hydraulic jacks to the rotary gearboxes, and a hydraulic drive of the device built into a rigid protective frame located along the face wall of the machine body. The hydraulic drive includes a double-acting pressure intensifier with a control unit, two hydraulic jacks with control units, designed for an operating pressure of up to 50 MPa, two rod pushers with the ability to move them in guides placed in the frame. EFFECT: increasing the holding and moving forces of the cutting elements, as well as reliable protection of the hydraulic jacks of the device. 1 cl, 2 dwg

Inventors

Ivan Vasilevich Kosarev
Artur Vladimirovich Meznikov
Vasilii Vasilevich Kosarev
Georgii Vladimirovich Andreev
Evgenii Mikhailovich Chaikov
Radion Vasilevich Konenko
Sergei Viktorovich Malenkov

Dates

Publication Date: 20260505
Application Date: 20251003

Claims (1)

A device for moving the cutting bodies of a mining combine, consisting of rotary reducers, pivotally fixed along the edges of the combine body, equipped with augers and rods, as well as a hydraulic drive containing hydraulic jacks, kinematically connected with the rods, characterized in that the hydraulic drive is built into a rigid protective frame, located along the face wall of the combine body, and includes a double-acting pressure multiplier with a control unit, two hydraulic jacks, hydraulically connected with the rod cavities of the pressure multiplier and kinematically connected with rod pushers with the possibility of their movement along the combine body in guides located in the upper and lower parts of the frame, wherein the eyes of the pushers are pivotally connected through rods with the eyes of the rotary reducers, in addition, the control unit of the multiplier is designed with the possibility of automatically switching the injection line into the piston cavity of the multiplier, from which the liquid is displaced by the piston in its extreme position.

Description

The invention relates to mining and can be used in the creation of mining combines for the development of highly durable mineral deposits with complex hypsometry. A device for moving the auger cutting elements of a shearer is known (see "Mining Machines for Underground Coal Mining": A Textbook for Universities / P.A. Gorbatov, G.V. Petruschkin, N.M. Lysenko et al. Donetsk. 2006. Nord Computer LLC, pp. 83 and 241), which is accepted as an analogue. The device includes a auger cutting element, a rotary gearbox, and a hydraulic drive for adjusting the position of the cutting element based on a hydraulic jack. The disadvantages of the analogue are the limited efforts to move and hold the auger in a strictly specified position due to the small diameter of the hydraulic jack, the relatively low pressure developed by the pump, as well as the susceptibility of damage to the hydraulic jack and other elements of the hydraulic drive due to their vulnerability to collapsing fragments of the rock mass. The closest to the proposed solution in terms of technical essence and the achieved result is the device for moving the auger cutting elements of the KDK500 shearer (see “Mining machines for underground coal mining”: Textbook for universities / P.A. Gorbatov, G.V. Petrushkin, N.M. Lysenko et al. Donetsk. 2006, Nord Computer LLC, pp. 241-249), which was chosen as a prototype. The prototype consists of an auger cutting element, a rotary gearbox, and a hydraulic drive for adjusting the cutting element's position using a hydraulic jack. A rod is installed between the lugs of the hydraulic jack and the rotary gearbox, allowing the hydraulic jack to be positioned longitudinally along the cutterhead body at its face wall, protecting the jack and control hydraulics from rock fragments during caving and crushing by the auger element. However, there remains the possibility of damage to the hydraulic jacks by fragments of collapsed rock when moving the combine with the conveyor to the face, which is a design flaw. The main drawback of the prototype is that, to guarantee effective control of the auger positions when breaking up rock mass with high cutting resistance (viscous coals with undercuts, potash ores, oil shale), fluid must be supplied to the piston and rod cavities of the hydraulic jacks under a pressure of 25-30 MPa, and up to 50 MPa in new generation combines. In the prototype design, the difficulty in achieving the cutting force required by modern combine harvesters is due to the significant difference in the leverage ratios applied to the slewing gearbox. Solving this problem requires supplying extremely high pressures (up to 50 MPa) of hydraulic fluid to the device's gyrojacks. Furthermore, if this pressure is reached in the existing hydraulic system design, it will be present in all components of the combine harvester's hydraulic system, including the pump unit and hydraulic lines, resulting in a high failure rate and significant hydraulic fluid leaks. The invention is based on the task of providing a significant increase in the holding and movement forces of the cutting elements of a mining combine by changing its design, as well as reliable protection of the hydraulic jacks of the device, while providing for an increase in the reliability and service life of the power and control hydraulics and the hydraulic system of the combine as a whole. The stated problem is solved due to the fact that in the device for moving the cutting bodies of a mining combine, consisting of rotary reducers, pivotally fixed along the edges of the combine body, equipped with augers and rods, as well as a hydraulic drive containing hydraulic jacks, kinematically connected with the rods, according to the invention, the hydraulic drive is built into a rigid protective frame located along the face wall of the combine body, and includes a double-acting pressure multiplier with a control unit, two hydraulic jacks, hydraulically connected to the rod cavities of the pressure multiplier and kinematically connected with rod pushers with the possibility of their movement along the combine body in guides located in the upper and lower parts of the frame, wherein the eyes of the pushers are pivotally connected through rods with the eyes of the rotary reducers, in addition, the control unit of the pressure multiplier is made with the possibility of automatically switching the injection line into the piston cavity of the multiplier, from which the liquid is displaced by the extreme piston position. The essence of the invention is explained by drawings. Fig. 1 shows a frontal view of the device for moving the cutting elements of a mining combine; Fig. 2 shows a cross-section of a double-acting pressure multiplier. The cutting unit movement device of a mining combine consists of right and left rotary gearboxes 1, pivotally mounted at the edges of the combine body, equipped with augers 2 and rods 3, configured to transmit force from hydraulic jacks to the rot