SU727857A1 - Arrangement for controlling the motion of powered roof support base - Google Patents

Description

one

The invention relates to the field of automation of plow units and complexes, namely, to means of maintaining the straightness of the base of the unit in the plane of the formation.

A device for automatically maintaining the straightness of a cleaning unit is known, the principle of which is based on measuring the degree of extension and retraction of the hydraulic jacks of the base advance movement. The device includes a potentiometer mounted in a tube of non-magnetic material entering the hollow piston rod. A rheostat with a slider is installed in the tube on the rod. The translucency of the sleeve with a slider was performed by an annular magnet (mounted in the piston). The electric circuits of the potentiometer are connected to a power source and a sensor on the control panel that fixes the position of the piston in accordance with the position of the slide 1.

However, this device is peculiar to the accumulation of displacement errors, both as a result of backlash in the nodes of the shifting system, and as a result of the lining slipping relative to the roof (soil) of the formation at the time of moving the base.

The closest technical solution known is a device for controlling the movement of a base of mechanized support, including active and passive sections of support, associated with the sections of the base with hydraulic jacks of movement, and a driver mechanism containing auxiliary hydraulic cylinders with retractable master elements and control elements of hydraulic jacks of movement of lining sections 2.

 A disadvantage of this device is the possibility of accumulating errors in the movement of the base and the loss of its linearity.

The aim of the invention is to increase the accuracy of maintaining the base straightness.

Claims (1)

The goal is achieved by the fact that the auxiliary hydraulic cylinders are mounted on passive sections of the lining and have track sensors, while the base sections are made with guides, and the driver elements are in the form of pins with hydraulic clamps placed in the base guides with the ability to interact with control elements hydraulic jacks of movement of active lining sections and track sensors. The drawing shows a schematic diagram of a device for controlling the movement of a base of powered support. On the passive section 1 with the piston cavity of the jack 2 of the base 3 disconnected from the hydraulic line, an auxiliary hydraulic cylinder 4 is installed, on the sliding part of which a control rod 5 is attached, connected to the section of the base by means of: a hydraulic clamp 6 located in the rails 7 with the spring 8. The bar is located with the possibility of interaction with the control element of the active sections of the lining 9 installed on the base, made either in the form of a hydraulic valve 10 or in the form of electro-hydraulic valves with sensors (not shown in the diagram), on which the tension is applied along the base and the thread 11 is fastened to the rod. The ratio of the number of active and passive lining sections is selected depending on the design features of a particular type of unit. The rod is also connected by gear rack and pinion 12 to a path sensor installed on the base (rod movement), which is a disk 13 with permanent magnets 14 moving relative to a fixed magnetic contact (reed switch) 15. The pressure of the working fluid is supplied to the auxiliary hydraulic cylinder through an electrohydraulic valve 16 along the hydraulic line 17; to hydraulic clamping - along hydraulic line 18, to piston cavity of hydraulic jacks - through hydraulic route 19 and to hydraulic holes of hydraulic jacks - through hydraulic line 20. The device works as follows In the initial state of the lining section 1 and 9 with hydraulic jacks 2, pull to base 3. The driver bar 5 is in the zero position of its conditional projection on the axis X-X of the fixed coordinate system of the coal seam plane. From the control panel, the operator sets the program for the required chip thickness h on a given base shifting cycle. This opens the electro-hydraulic valve 16 and the working fluid 4 starts to flow into the hydraulic cylinder 4, due to which the boom. 5 moves relative to the fixed base 3, rotating the disk 13 and the magnets 14 upon the pinion of the pinion gear 12, acting on the reed switch 15 and emitting impulses to the line. At the moment when the number of pulses of the boom path sensor reaches a predetermined program, the operator, according to the meter readings (or automatic ycT roystvo), will disconnect the electrohydraulic valve 16 and the reference shaft will be fixed in position h, at which the hydraulic valve 10 will open (from the bar or through the corresponding sensors and electric drive from the thread 11). After that, the operator turns on the pressure of the working fluid, which flows through the hydraulic valve 10 through the hydraulic line 19 into the piston cavities of the hydraulic jacks 2 of the active sections of the lining 9 and the base 3 moves to the bottom, performs the stroke set by it for the amount of chips h, and then stops. The reversible pulse counter on the operator’s console marks the stroke made by the base. As is known, the base, due to various reasons, may not accurately follow its course. However, due to the rigid attachment of the driver rod to the h mark along the X-X axis of the formation plane, this error will be compensated for in the next shift cycle. Tying the driver rod to the reservoir in this device is carried out by pressing it with a spring 8 to a locked volume of fluid in the hydraulic cylinder 4 fixed to the fixed passive section of the lining 1, which slippage at the moment of base shifting is prevented, since the piston cavity of its hydraulic jack 2 is disconnected from the main line . The counting of the movement of the rod is conducted on the base by monitoring its actual movement, proportional to a given number of pulses, each starting at zero. After several cycles of movement of the base, when the stroke of hydraulic jacks 2 is completely selected, hydraulic line 20 is supplied with pressure of working fluid into the rod cavity of hydraulic jacks of active 9 and passive 1 lining sections, as well as pressure in hydraulic clamp 6 along hydraulic line 18 and the setting rod 5 is rigidly fixed relative to the fixed base 3, while the lining of the lining sections is ongoing. Regardless of which position of the rod of the hydraulic cylinder 4 causes the passive section 1 to spread, the new cycle of shifting the rod 5 starts from the position in which it was at the mark along the axis X-X of the previous cycle. The required accuracy of control of the device is determined by the number of electrical pulses of the sensor per unit length of the boom travel path and depends on the location and the number of magnets 14 on the disk 13. Such an embodiment of the devices eliminates the accumulation of errors of the hydraulic jacks, maintains the linearity of the base of the unit, which ultimately the result improves the performance and reliability of the cleaning unit. The invention The device for controlling the movement of the base of mechanized support, including active and passive sections of