US3842602A - Miner tram control circuit - Google Patents
Miner tram control circuit Download PDFInfo
- Publication number
- US3842602A US3842602A US00377342A US37734273A US3842602A US 3842602 A US3842602 A US 3842602A US 00377342 A US00377342 A US 00377342A US 37734273 A US37734273 A US 37734273A US 3842602 A US3842602 A US 3842602A
- Authority
- US
- United States
- Prior art keywords
- control
- output
- pump
- valve
- hydraulic fluid
- 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
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/38—Control of exclusively fluid gearing
- F16H61/40—Control of exclusively fluid gearing hydrostatic
- F16H61/46—Automatic regulation in accordance with output requirements
- F16H61/47—Automatic regulation in accordance with output requirements for achieving a target output speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/38—Control of exclusively fluid gearing
- F16H61/40—Control of exclusively fluid gearing hydrostatic
- F16H61/42—Control of exclusively fluid gearing hydrostatic involving adjustment of a pump or motor with adjustable output or capacity
Definitions
- ABSTRACT I A fluid control circuit for use in a mining machine 52 us. c1 ..60/327,660;1428(266(g;2876, tram System whereby there is provided a protection [51] Int Cl Flsb 18/00 control to prevent undesired movement of a mining [58] Field of Search 421 427 48 4 486 machine and a selective range of speed controls as 60/327 447 420 80/6 may be required under different operating conditions.
- a plurality of interlocked valve mechanisms are utilized with a means of limiting operation of certain [56] References valves whencontrol of a slow speed range is desired.
- a new and improved tram control circuit including a speed range control piston selectively operated to affect a speed control rapidly over a wide range or affect a very close control of speed in alimited slow speed range.
- the control circuit also includes a novel creep control with an interlocked valve arrangement whereby speed control is locked at a zero speed without simulta neous manual operation of a plurality of cooperatively acting valves.
- FIG. 1 is a schematic view of the hydraulic control system included the individual interconnected valves, pumps and motors in outline;
- FIG. 2 is outline view of a conventional rotary pump partly in section with a limiting cylinder included.
- FIG. 1 there is shown a hydraulic control circuit for a miner having a constant speed hydraulic pump for driving a constant displacement hydraulic motor 12 on the left side of the miner and a constant speed hydraulic pump 14 for driving a constant displacement hydraulic motor 16 on the right side of the miner.
- the motors l2 and 16 each in turn drive their individual tracks (not shown) respectively on the left and right side of the miner by conventional gearing means not shown.
- the pumps 10 and 14 are of the conventional constant speed, reversible type shown in FIG. 2 each one having a rotary barrel l8 driven by electric motors 19 (FIG. 1), and a variable inclined cam plate 20 operating intake and output pistons 22 in accordance with the angle of inclination of the cam plate 20. Variations in the supply of fluid under pressure to an internally located control piston 24 changes the positioning of the piston 24 to vary the angle of inclination of cam plate 20 to in turn regulate thep'ump displacement which determines the speed of operation and direction of operation of motors 12 and 16 in a conventional manner.
- Reversal of the angle of the inclination of the cam plate 20 affects reversal of the function of the pistons 22 such that the intake function becomes an output function and vice versa to in turn effect reversal of the direction of operation of the associated motor 12 or 16.
- Control of the positioning of a control piston 24 is affected by a rotary valve 26 (FIG. 2) within the pump under the control of lever 28 (FIG. I).
- the lever 28 (FIG. 1) is positioned by a selfcentering double-acting cylinder device 30 (FIG. I) operative to different lever operating positions responsive to variable pressures in control lines 32 and 34 for each of said cylinder devices 30.
- the supply of fluid under pressure to.one or the other of the control lines 32 and 34, one being charged the other being vented to a reservoir 33 by lines 35, is selectively controlled by positioning of levers 36 and 38 of a manually operated two bank variable pressure control valve 40 located at the operators station.
- Supply of fluid under pressure to lines 32 and 34 controls operation of the two cylinder devices 30.
- the determination of which track is moved, at what speed it is moved, and in which direction it is moved is dependenton which of the levers 36 and 38 are moved, in what direction they are moved, and how far they are moved in a conventional tram control manner.
- the valve 40 is a conventional pressure control valve shown as the two lever controls in the outline box 40 where for example a predetermined degree of movement of a lever 36 varies the fluid under pressure from a source described hereinafter to the lines 32 and 34 to the cylinder device 30 to vary the pressures in respective chambers 42 and 44 thereof.
- the regulation of the pressures in chambers 42 and 44 regulates the position of a piston 46 and connecting rod 48 to position the lever 28, which in turn positions the regulating valve 26 (FIG. 2).
- the regulating valve 26 selects predetermined fluid pressure deliveries to the control chambers 50 and 52 of the internal control piston 24 which in turn determines the angle of inclination of the cam plate 20. Variation of the angle of cam plate 20 varies the intake fluid of the pumps.
- Such intake to the pump is supplied through lines 56 which communicate between a reservoir '54 and a usual charaging pump 58.
- the fluid is then pressurized and supplied via lines 60 and 62 through a high pressure relief valve 64 to the respective motors. Variation of the pressure supplied to the motors effects variation 'of the speed and direction of tramming of the miner through a drive shaft 66.
- the pumps operate in a conventional manner wherein positioning of the control piston 24 regulates the position of the cam plate 20 which in turn regulates the output of the pump and thus the speed and direction of motor operation.
- a charging pump 58 at the intake to the pump supplies sufficient fluid to make up for leakage and supply low pressure fluid for operating the pump control.
- a control circuit comprising feed lines 68 and 70 supplying fluid under pressure from the charging pumps 58 to a double check shuttle valve 72 where the higher pressure delivered by the two feed lines is effective to block off the lower pressure and is delivered vvia a charging line 74 to a two position mechanically opertions with the pedal 78 in a non-depressed position (flow through valve 76 when pedal 78 is in a nondepressed position is indicated on FIG.
- the fluid under pressure delivered thereto from charging line 74 is fed directly therethrough and via line 80 to a double acting pilot check valve 82 to operate internal check valves (not shown) to permit the relief valves 64 of the pump motors l2 and 16 to vent via lines 84 and 86 to the valve 82 and then to a reservoir 88, a condition in which the motors 12 and 16 do not run.
- a deliverry line 90 leading to the control valve 40 is vented through the foot valve 76 to a reservoir 92.
- a speed selector circuit including a line 94 from the charging line 74 to a two position selector valve 96 with a selector lever 98 (flow through the valve indicated by the solid arrowed line in FIG. 1).
- the fluid under pressure from line 94 is supplied to selector line 100 and then to each pump volume control at a chamber 102 in a limiting cylinder 104 connected to the control chamber 50 and the control piston 24.
- Supply of fluid under pressure in chamber 102 acts on a limiting piston 106 having an adjustable stem 108 which moves against the control piston 24 to limit the travel thereof and thereby limit the volume range of the pumps and 14 and thus limit the speed range of the motors l2 and 16 as hereinafter described.
- the selector lever 98 When the selector lever 98 is in a second position (flow therethrough indicated by the dotted arrowed line in FIG. 1), the selector line 100 is vented therethrough to a reservoir 110 to vent the limiting cylinder 104 and prevent the described limiting of the movement of control piston 24 thereby restoring the full volume and speed range to the pump and motor drive system, respectively, as described hereinafter.
- Depression of the foot pedal 78 permits a supply of fluid under pressure from the charging line 74 to the delivery-line 90 and thence to control valve 40 where such fluid under pressure is utilized as desired by manipulation of the control levers 36 and 38, to supply fluid under pressure to the control lines 32 and 34 and effect the conventional control-of pump and motor system as desired. Depression of the pedal 78 also effects cut-off of the venting of the check valves (not shown) of valve 82 and locks the internal valving (not shown) such that an operating pressure buildup occurs in the relief lines 84 and 86 and relief valves 64 to permit operation of the motors.
- the speed range of the pump and motor system is determined by the positioning of the control piston 24 (FIG. 2) in the conventional manner.
- the lever 98 of selector valve 96 is moved to the position shown in FIG. 1 wherein fluid under pressure is supplied therethrough from the charging line 74 to a control line 100 to act on the limiting piston 106 in the limiting cylinder 104 in a manner that the adjustable piston stem 108 thereof is moved into the operating space of the control piston 24 to thereby limit the movement of the control piston 24 to the left which in turn according to conventional operating procedures will limit the operating output range of pumps in the forward direction and thereby prevent excessive undesired speeds of the miner while sumping.
- selector valve 96 is described hereinabove as being manually operable by means of lever 98, however, a pilot operable valve can be substituted therefor which is made operable by pressure responsive or electrical means, and the like.
- a method of controlling the tramming rate of a mining machine having a constant speed hydraulic pump means and at least one hydraulic driving motor for tramming comprising the steps of: directing at least a major portion of the output of pressurized hydraulic fluid from said pump means to said driving motor for hydraulic energization thereof; directing a first control portion of such pressurized hydraulic fluid from said pump means to a first control valve means; selectively moving said first control valve means to vary the quantity of output of pressurized hydraulic fluid from said pump means; directing a second control portion of such pressurized fluid from said pump means to a second control valve means; selectively moving said second control valve means to limit the maximum quantity of output of pressurized hydraulic fluid from said pump means.
- said first maximum output said directing of said second control portion of said pressurized hydraulic fluid is to a reservoir.
Abstract
Description
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00377342A US3842602A (en) | 1971-09-16 | 1973-07-09 | Miner tram control circuit |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US18108771A | 1971-09-16 | 1971-09-16 | |
US00377342A US3842602A (en) | 1971-09-16 | 1973-07-09 | Miner tram control circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
US3842602A true US3842602A (en) | 1974-10-22 |
Family
ID=26876872
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00377342A Expired - Lifetime US3842602A (en) | 1971-09-16 | 1973-07-09 | Miner tram control circuit |
Country Status (1)
Country | Link |
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US (1) | US3842602A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2295398A1 (en) * | 1974-12-18 | 1976-07-16 | Bofors Ab | PRESSURE CIRCUIT FOR A HYDRAULIC FLUID FOR ARTILLERY PART |
US4068728A (en) * | 1976-05-14 | 1978-01-17 | United States Steel Corporation | Hydraulic flow divider for a mining vehicle |
US5174115A (en) * | 1991-09-30 | 1992-12-29 | Clark Equipment Company | Electrically actuated and controlled auxiliary hydraulic system for skid steer loader |
CN102606155A (en) * | 2011-01-21 | 2012-07-25 | 乔伊·姆·特拉华公司 | Method of controlling a miner to cause wobble in the cutting heads |
-
1973
- 1973-07-09 US US00377342A patent/US3842602A/en not_active Expired - Lifetime
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2295398A1 (en) * | 1974-12-18 | 1976-07-16 | Bofors Ab | PRESSURE CIRCUIT FOR A HYDRAULIC FLUID FOR ARTILLERY PART |
US4068728A (en) * | 1976-05-14 | 1978-01-17 | United States Steel Corporation | Hydraulic flow divider for a mining vehicle |
US5174115A (en) * | 1991-09-30 | 1992-12-29 | Clark Equipment Company | Electrically actuated and controlled auxiliary hydraulic system for skid steer loader |
CN102606155A (en) * | 2011-01-21 | 2012-07-25 | 乔伊·姆·特拉华公司 | Method of controlling a miner to cause wobble in the cutting heads |
US20120187743A1 (en) * | 2011-01-21 | 2012-07-26 | David Stryffeler | Method of controlling a miner to cause wobble in the cutting heads |
US8967728B2 (en) * | 2011-01-21 | 2015-03-03 | Joy Mm Delaware, Inc. | Method of controlling a miner to cause wobble in the cutting heads |
CN102606155B (en) * | 2011-01-21 | 2016-06-29 | 乔伊·姆·特拉华公司 | Control Mars Miner so that cutter head swing method |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: JOY MANUFACTURING COMPANY, 535 SMITHFIELD STREET, Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:ZIEGLER, DONALD, D.,;DAILY, GLENN, A.,;REEL/FRAME:004718/0976 Effective date: 19710915 Owner name: JOY TECHNOLOGIES INC., 301 GRANT STREET, PITTSBURG Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:JOY MANUFACTURING COMPANY, A CORP. OF PA;REEL/FRAME:004880/0430 Effective date: 19870529 Owner name: JOY TECHNOLOGIES INC., A CORP. OF DE.,PENNSYLVANIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:JOY MANUFACTURING COMPANY, A CORP. OF PA;REEL/FRAME:004880/0430 Effective date: 19870529 |
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AS | Assignment |
Owner name: JOY TECHNOLOGIES INC., 301 GRANT STREET, PITTSBURG Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:JOY MANUFACTURING COMPANY, A CORP. OF PA;REEL/FRAME:004747/0261 Effective date: 19870626 Owner name: CITIBANK, N.A., 641 LEXINGTON AVENUE, NEW YORK, NE Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:JOY TECHNOLOGIES INC., 301 GRANT STREET, PITTSBURGH, PA 15219, A DE CORP.;REEL/FRAME:004846/0025 Effective date: 19870626 Owner name: CITIBANK, N.A.,NEW YORK Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:JOY TECHNOLOGIES INC., 301 GRANT STREET, PITTSBURGH, PA 15219, A DE CORP.;REEL/FRAME:004846/0025 Effective date: 19870626 Owner name: JOY TECHNOLOGIES INC., PENNSYLVANIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:JOY MANUFACTURING COMPANY, A CORP. OF PA;REEL/FRAME:004747/0261 Effective date: 19870626 |
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AS | Assignment |
Owner name: JOY MANUFACTURING COMPANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST. EFFECTIVE DATE;ASSIGNOR:JOY TECHNOLOGIES INCL., (A DE CORP.);REEL/FRAME:004827/0367 Effective date: 19870626 Owner name: JOY MANUFACTURING COMPANY,STATELESS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:JOY TECHNOLOGIES INCL., (A DE CORP.);REEL/FRAME:004827/0367 Effective date: 19870626 |
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AS | Assignment |
Owner name: CITIBANK, N.A., 641 LEXINGTON AVENUE, NEW YORK, NE Free format text: SECURITY INTEREST;ASSIGNOR:JOY TECHNOLOGIES INC.,;REEL/FRAME:004936/0730 Effective date: 19870626 |
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AS | Assignment |
Owner name: JOY TECHNOLOGIES INC., A CORP OF DE, PENNSYLVANIA Free format text: RELEASED BY SECURED PARTY;ASSIGNORS:MC CARTNEY, DEREK L.;ARCHIBALD, JOHN H.;REEL/FRAME:005237/0152 Effective date: 19870626 |
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AS | Assignment |
Owner name: JOY TECHNOLOGIES, INC., A CORP OF DE Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:CITIBANK N.A.;REEL/FRAME:005237/0187 Effective date: 19891011 |
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AS | Assignment |
Owner name: CONNECTICUT NATIONAL BANK, THE, CONNECTICUT Free format text: SECURITY INTEREST;ASSIGNOR:JOY TECHNOLOGIES INC., A DE CORP.;REEL/FRAME:005173/0843 Effective date: 19891012 |