US3754129A - Automatic control for mining pit props - Google Patents
Automatic control for mining pit props Download PDFInfo
- Publication number
- US3754129A US3754129A US00061345A US3754129DA US3754129A US 3754129 A US3754129 A US 3754129A US 00061345 A US00061345 A US 00061345A US 3754129D A US3754129D A US 3754129DA US 3754129 A US3754129 A US 3754129A
- Authority
- US
- United States
- Prior art keywords
- thrust
- piston
- pulses
- piston drive
- rearward
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000005065 mining Methods 0.000 title abstract description 5
- 238000005259 measurement Methods 0.000 claims description 12
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 238000011084 recovery Methods 0.000 abstract description 10
- 238000011156 evaluation Methods 0.000 abstract description 6
- 230000000875 corresponding effect Effects 0.000 description 5
- 230000002596 correlated effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
- E21D23/006—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor provided with essential hydraulic devices
- E21D23/0065—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor provided with essential hydraulic devices driven, or automatically, e.g. electrically-hydraulically controlled
Definitions
- ABSTRACT A control for the alignment and if need be, pivoting of a prop or post in mining, whose theoretical course in the plane of the work is indicated by a straight line or a curve and whose ideal or actual course results from positive or negative deviations, which are analyzed at several measuring points located along the prop or post by means of digital forward and backward (or positive and negative) logic pulses. Each measuring point corresponds to an evaluation unit having a storage member.
- Each unit converts the stored signals into control signals for spatially differentiated treatment of a mine face, whereby the storage members of the evaluation units are connected with one another by a storage interrogation and return conduit.
- To each measuring point are assigned two measuring devices, of which at least one comprises a thrust-piston drive serving for the advance of the recovery device-The piston path or stroke of the thrust piston drive is divided into partial lengths, whose through-passage through the piston in each case releases one of the binary rearward or forward pulses.
- the device according to the above U.S. Patent attempts to eliminate this problem by providing at each measuring point, two devices which are formed by two adjacent thrust-piston drives.
- the measuring may thereby always be carried out by that thrust-piston drive which is braced straight, while the other thrustpiston drive is advanced.
- This solution has, however, several disadvantages.
- SUMMARY OF THE INVENTION serves for the advance of the recovery device and a rear thrust piston drive measures the spacing of the supports of the two thrust piston drives, and that the evaluation unit receives the sum of the measurements of both thrust-piston drives.
- the removal of the load of the front thrust-piston drive and its advancement causes a corresponding number of rearward pulses. These pulses are multiplied by a series of'additional rearward pulses, when the recovery device slides backwards. Because, at the same time, the spacing of the two supports is increased, the rear thrust-piston drive delivers a number of forward impulses corresponding to the advancing movement of the forward thrust-piston drive. The algebraic sum of all pulses is supplied by the rearward movement of the recovery device, which is to be corrected by means of the guidance.
- the measuring device of the rearward thrust-piston drive which serves exclusively for the measuring, is disconnected upon advancing its support.
- This thrustpiston drive may be constructed relatively simply.
- a pneumatically impinged thrust-piston drive is sufficient for this purpose, when the front thrust-piston drive is actuated hydraulically.
- FIG. 1 shows diagrammatically a measuring point before advancing the measuring thrust-piston drive
- FIG. 2 shows a view corresponding to FIG. 1 with the parts in the condition after advancement
- FIG. 3 shows the condition of the parts, after the support of the second thrust-piston drive is also advanced.
- FIG. 4 is a hydraulic logic circuit according to the invention.
- a pivot F of a conveyor is connected to a hydraulic thrust-piston drive H.
- a part of a recovery device is shown connected to the pivot.
- the hydraulic thrust-piston drive H is supported at S 2.
- the support may be carried out by means of a hydraulic post or in any other manner desired.
- the support S 2 is itself connected with a further thrust-piston drive P, whose support is located at S l.
- Both thrust-piston drives M1 and M2 are provided with devices which are in position to measure the partial lengths passed through in each case by the piston rods. This measurement may, for example, be made with the aid of a perforated disc, which is rotated synchronously with the movement of the piston rods, and which controls an air current.
- the thrust-piston drives may supply forward and rearward pulses, which are introduced into an evaluation unit E as the sum of the measurements, in order to measure the deviations of the actual course of the conveyor from the theoretical course.
- Elements M1, M2 and E are illustrated only in FIG. I, but would also be found in the systems of FIGS. 2 and 3.
- the support S 2 Upon advancement of the front and preferably hydraulically actuated thrust-piston drive H, the support S 2 is released and follows up toward pivot F. Itis assumed for this discussion that the length of the path of the piston rod is divided into five digital units. The mea- With the shifting of the support S 2, however, at the same time the piston rod of the rearward thrust-piston drive P is advanced. The measuring device associated with this thrust-piston drive produces thereby a series whereby, at the control 2, rearward pulses are given off. These rearward pulses indicate accurately the change in position of the conveyor.
- the advancement of the support S 2 may accordingly take place at any desired point of time and any desired manner, without measurement errors occurring in the control. If subsequently the point S l is drawn up in the direction toward S 2, then the rearward thrust-piston drive P is automatically disconnected and supplies no rearward pulses.
- the rearward thrust-piston drive may be actuated pneumatically, even if the front thrust-piston drive H is hydraulically driven because of the large forces applied by it.
- the hydraulic logic circuit shown in FIG. 4 operates in cycles.
- the forward pulses appearing at V, the rearward pulses occurring at R and the rear wetting pulses occurring at RS may therefore be of any desired form and duration of time. In this manner, pulse fonners are eliminated, whose capillaries are known to be subject to disturbance.
- the RS, R and V pulses may have any desired duration and form and may also occur at desired points of time, accordingly even simultaneously. They are stored in reset-dominated storage members 10, and 30.
- a sufficiently rapid pulse generator paces the AND members 100, 200 and 300 so that RS and R pulses are permitted to pass solely during the pulse duration of the cycle pulses, while V pulses are passed on solely in the pulse pause of the cycle. Thereby, the V pulses are automatically locked against the R and RS pulses.
- the locking between RS and R pulses takes place by means of the locking conduits V200 or V100 and 100 and 200. Accordingly, the first pulse occurring is also treated first.
- the AND gates 100 and 200 are in each case opened for the duration of a cycle pulse, so that the rearward shifting pulses reaching the storage register through the OR gate 40, are not longer than the cycle pulse. Likewise, the forward pulses reaching the shifting register at 50 are not longer than the pause or interruption in the cycle.
- a pulse passes an AND gate 100, 200 or 300, respectively, then the associated and pre-connected storage member 11, 21 or 31, respectively, is set. Thereby the AND members 1 11, and 21 1 take care that the correct storage member is set by the pulse at 40.
- the storage member 11, 21 or 31 resets the respectively associated storage members 10, 20 or 30. On account of the reset domination, a re-connection of these storage members by means of still existing R, RS or V pulses is not possible, as long as the respectively correlated storage member 11, 21 or 31 still carries a signal.
- the resetting of the storage member 11, 21 or 31 takes place through the respective AND gates 110, 210 or 310 when first the respective signal RS, R or V, has disappeared, and when secondly the associated storage member 10, 20 or 30 in each case has been reset.
- the signals retained in the storage members are now converted into control signals, which make possible a spatially differentiated treatment of the face of the mine.
- an improved measurement system for digitally measuring a distance through which at least a portion of said equipment is advanced comprising:
- first measurement means for providing a first train of pulses having a number equal to the number of said partial lengths traversed by said first thrustpiston drive and having a forward or rearward characteristic determined by the direction advance of said first thrust-piston drive
- a second thrust-piston drive having a piston thrust path divided into a plurality of similar partial lengths and being connected to advance said first support point (S2) with respect to a second support point (81),
- D. second measurement means for providing a second train of pulses having a number equal to the number of partial lengths corresponding to the change in displacement between the first and second support points and having a forward or rearward characteristic determined by the direction of said change of displacement, and
- E means for evaluating the algebraic sum of the first and second trains of pulses for digitally measuring the distance through which said equipment is advanced.
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Fluid-Pressure Circuits (AREA)
- Control Of Conveyors (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19691939990 DE1939990C (de) | 1969-08-06 | Selbsttätige Steuerung zum Ausrichten und gegebenenfalls Schwenken eines Strebes im Bergbau |
Publications (1)
Publication Number | Publication Date |
---|---|
US3754129A true US3754129A (en) | 1973-08-21 |
Family
ID=5742058
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00061345A Expired - Lifetime US3754129A (en) | 1969-08-06 | 1970-08-05 | Automatic control for mining pit props |
Country Status (3)
Country | Link |
---|---|
US (1) | US3754129A (ko) |
FR (1) | FR2056580A6 (ko) |
GB (1) | GB1319069A (ko) |
Citations (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3224674A (en) * | 1964-05-11 | 1965-12-21 | Raymond W Warren | High-speed counters and fluid forward-backward counters |
US3319644A (en) * | 1965-01-19 | 1967-05-16 | Powers Regulator Co | Pneumatic control unit |
US3437010A (en) * | 1966-02-17 | 1969-04-08 | Oskar Jacobi | Mine roof support means |
US3436922A (en) * | 1966-10-20 | 1969-04-08 | Hermann Irresberger | Mine roof supports |
US3445640A (en) * | 1965-01-29 | 1969-05-20 | Davy & United Eng Co Ltd | Apparatus for monitoring the position of an object displaceable along a predetermined path |
US3452645A (en) * | 1965-06-18 | 1969-07-01 | Elliott Brothers London Ltd | Monitoring of control systems |
US3473546A (en) * | 1968-01-02 | 1969-10-21 | Corning Glass Works | Up and down binary counter |
US3478522A (en) * | 1967-02-02 | 1969-11-18 | Bergwerksverband Gmbh | Control arrangements for hydraulic pit prop support units |
US3482877A (en) * | 1967-05-31 | 1969-12-09 | Bergwerksverband Gmbh | Control system for aligning or turning longwall faces in mine workings lined with walking casing frames |
US3495776A (en) * | 1968-05-24 | 1970-02-17 | Bowles Eng Corp | Counter-comparator system |
US3495499A (en) * | 1965-03-18 | 1970-02-17 | Gullick Ltd | Remote control of mine roof supports |
US3531800A (en) * | 1964-10-08 | 1970-09-29 | Olivetti & Co Spa | Digital position measuring device |
US3534560A (en) * | 1968-01-31 | 1970-10-20 | Bergwerksverband Gmbh | Traveling casing systems for mine workings |
US3537102A (en) * | 1966-04-12 | 1970-10-27 | Olivetti & Co Spa | Digital position measuring device |
-
1970
- 1970-08-04 FR FR7028765A patent/FR2056580A6/fr not_active Expired
- 1970-08-05 US US00061345A patent/US3754129A/en not_active Expired - Lifetime
- 1970-08-06 GB GB3792570A patent/GB1319069A/en not_active Expired
Patent Citations (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3224674A (en) * | 1964-05-11 | 1965-12-21 | Raymond W Warren | High-speed counters and fluid forward-backward counters |
US3531800A (en) * | 1964-10-08 | 1970-09-29 | Olivetti & Co Spa | Digital position measuring device |
US3319644A (en) * | 1965-01-19 | 1967-05-16 | Powers Regulator Co | Pneumatic control unit |
US3445640A (en) * | 1965-01-29 | 1969-05-20 | Davy & United Eng Co Ltd | Apparatus for monitoring the position of an object displaceable along a predetermined path |
US3495499A (en) * | 1965-03-18 | 1970-02-17 | Gullick Ltd | Remote control of mine roof supports |
US3452645A (en) * | 1965-06-18 | 1969-07-01 | Elliott Brothers London Ltd | Monitoring of control systems |
US3437010A (en) * | 1966-02-17 | 1969-04-08 | Oskar Jacobi | Mine roof support means |
US3537102A (en) * | 1966-04-12 | 1970-10-27 | Olivetti & Co Spa | Digital position measuring device |
US3436922A (en) * | 1966-10-20 | 1969-04-08 | Hermann Irresberger | Mine roof supports |
US3478522A (en) * | 1967-02-02 | 1969-11-18 | Bergwerksverband Gmbh | Control arrangements for hydraulic pit prop support units |
US3482877A (en) * | 1967-05-31 | 1969-12-09 | Bergwerksverband Gmbh | Control system for aligning or turning longwall faces in mine workings lined with walking casing frames |
US3473546A (en) * | 1968-01-02 | 1969-10-21 | Corning Glass Works | Up and down binary counter |
US3534560A (en) * | 1968-01-31 | 1970-10-20 | Bergwerksverband Gmbh | Traveling casing systems for mine workings |
US3495776A (en) * | 1968-05-24 | 1970-02-17 | Bowles Eng Corp | Counter-comparator system |
Also Published As
Publication number | Publication date |
---|---|
DE1939990A1 (de) | 1971-02-18 |
FR2056580A6 (ko) | 1971-05-14 |
GB1319069A (en) | 1973-05-31 |
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