SU570717A1 - System for maintaining rectilinearity of base of stoping sets - Google Patents

Description

The invention relates to the field of mining and can be used in mechanized complexes of mining faces in the coal and mining industries .5 The systems for maintaining the straightness of the base of the cleaning complexes containing hydraulic jacks, valves, control valves, linearity control, 10 which are made in the form of a bracket, are known the end of which is rigidly fixed to the base section, and the other, through the adjusting screw, interacts with the hydraulic booster slide 1.15 The system is low accuracy and slow correction of errors received during operation. Also known are systems for maintaining the pr-20 molinearity of the base of sewage treatment plants, containing pressure and discharge lines, shifter jacks, hydraulic distributors, check valves and flow dividers with spools 2.25. The disadvantages of this system are the large number of flow dividers and the lack of a linearity control sensor. This reduces the reliability and accuracy of the system for maintaining the baseline straightness. This is achieved by the fact that the flow divider is provided with an additional spool, one of the cavities of which is hydraulically communicated with one of the adjacent flow dividers and one of the cavities of the shifter jack, and the other with the pressure line through the linearity control sensor. FIG. Figure 1 shows the hydraulic diagram of the straightness support system; in fig. 2 - flow divider, longitudinal section. The system for maintaining the straightness of the base of the cleansing complexes contains base 1 moved by hydraulic jacks 2, the piston cavities of which are connected to dividers 3, each of which has two inlet channels 4 and 5 and several, for example three, outlet channels 6-8. The input channel 4 of each flow divider 3 is connected to the pressure line 22, the channel 5 is connected to one output channel 8 of the adjacent flow divider, and the output channels 6 and 7 are connected to the piston cavities of the adjacent hydraulic jacks. The flow divider comprises a housing 10 in which a spool 11, an additional spool 12, valves 13, a spring are placed.

14, the throttle holes 15 and 16 and the chambers 17, 18 and 19.

The other cavities of the hydraulic jacks 2 are controlled by the hydraulic distributors 20, which are mounted on each lining section. Parallel to the flow dividers, check valves 21 are installed. The pressure pipe 22 and the drain 9 lines are connected to the pump unit by means of a hydraulic distributor 23. At the junctions of the base sections, sensors of control of straightness 24 are installed, the shells of which are fixed on one section and the levers on the other. Through these sensors, the channels 4 flow dividers 3 are connected to a pressure line 22.

The system works as follows.

In the case of the frontal advancement of the base by the hydraulic distributor 23, the working medium under pressure is supplied to the pressure line 22 and through the sensor 24 enters the channel 4 of the divider 3 flow. Next, the working medium through the slots formed by the valve 13 and the housing 10, the throttle holes 15 and 16 and the channel 7 enters the piston cavity of the hydraulic jack 2. At the same time, the working medium through the channel 8 enters the channel 5 of the adjacent flow divider and then through the channel 6 into the piston cavity of the adjacent hydraulic jack. If the hydraulic jacks move at the same speed, the flow to them is the same, and the spools 11 and 12 are set to a middle position at which the flow sections. channels 6, 7 and 8 are the same. When the speed of one of the jacks changes, the equilibrium of the spools 11 and 12 is disturbed, they shift and change the flow areas of the channels 6-8. Fluid flows through them are changed, and the speeds of the hydraulic jacks are flattened, after which the spools 11 and 12 return to their original position. The valve 13 maintains a flow rate constant, independent of the change in resistance, overcome by hydraulic jacks. If the baseline is broken, the Zgly is formed at the junction sections, fixed by sensors 24, which regulate the flow rate of the working medium coming from line 22 to the dividers 3 of the flow, depending on the angle of the bend.

If the bending angles exceed a critical value, then the sensors 24 block the flow of the working medium, and the movement of the base on this

The plot is terminated until this angle recovers the allowable value.

To move the support sections to the base, the hydraulic distributor 20 connects line 9 to the pump unit, and line 22 to the drain. When acting on the distributor 20, the working medium under pressure enters the thrust cavity of the hydraulic jack 2, and the working medium is displaced from the piston cavity into the drain through the check valve 21, the divider 3 of the flow passes.

The presence of an additional spool, one of the cavities of which is hydraulically communicated with one of the adjacent flow dividers and one of the shifting hydraulic jack cavities and the other with the pressure line through the linearity control sensor, improves the reliability and accuracy of the system, reduces the number of flow dividers and simplifies the system straightness of the base of sewage treatment plants.

This, ultimately, reduces the number of base breakdowns and improves the performance of the complexes.

Claims (2)

1. USSR author's certificate AI 451852, cl. E 21 D 23/00, 1974. 2. Shirokov A.P., Zhabin G.I., Baurin V.G. Test of the system of maintaining linearity. “Mining Machines and Automatics, No. 11, 1972, p. ten.