Abstract: A pressure-driven apparatus sequential controls a multiphase operation, e.g., of a cementing head. A transmission arm including a pawl is supported on a cam shaft connected to a pawl cylinder having a built-in return force, directional control valves with a spring return member and roller, operated by the cam plates of the cam shaft, that are staggered relative to each other in a predetermined angle to a pawl disk supported in bearings. The pawl cylinder will rotate cam shaft to a predetermined angular position in the same rotational direction each time the system is supplied with pressure, and operate the directional valves with rollers, whereby the directional valves will apply pressure to actuators present so that cementing valves or other types of valves will open for a predetermined period of time until a timer control shuts off the pressure supply, the pressure is discharged, and the pawl cylinder returns to the starting position thereof.
Abstract: A hydraulic tilting device for tilting the cab of a vehicle between a driving position, in which the vehicle can be driven normally, and a tilted position, in which, for example, maintenance can be carried out on a vehicle engine positioned beneath the cab. The tilting device comprises a double-acting tilting cylinder having a first and a second connection, a reservoir for hydraulic fluid and a pump having a single pumping direction, which pump has a suction port which is in communication with the reservoir and a single delivery port for delivering pressurized hydraulic fluid. The tilting device has a valve, in inlet passage of which is connected to there delivery port of the pump, which valve has an actuable shut-off member, so that in a first position thereof the delivery port is connected to the first connection of the tilting cylinder and in the second position thereof the delivery port is connected to the second connection of the tilting cylinder.
Abstract: When a start SW 3 is pressed, a one-shot multivibrator circuit 15 turns on and releases a pulse. The pulse is transmitted to a self-hold circuit 16 which in turn stays in self-hold mode and releases an H level output continuously until it is reset. This cause a transistor 17 to turn on and actuate a ram downward movement relay R1. When the ram arrives at the lower limit of its movement, a lower LS 4 is opened causing a self-hold circuit 21 to produce an H level signal in accordance with an output of a one-shot multivibrator 18. The H level signal from the self-hold circuit 21 is delayed by a delay circuit 22 and turns on a transistor 23. As the result, a ram upward movement relay R2 is actuated. Because of the function of the one-shot multivibrator circuit 15, the ram will not restart when the start SW 3 is continuously depressed. The delay circuit 22 contributes to the longer operational life of a directional valve switching mechanism.
Abstract: A rotating device for a diesel motor comprises a unit having a plurality of pneumatic cylinders that can be brought into mating engagement with teeth on a flywheel of the motor. Each pneumatic cylinder, under the control of a control unit, is actuated and sequentially pushed into the teeth such that a counter-clockwise or clockwise rotation is possible.
September 18, 1997
Date of Patent:
April 27, 1999
MaK Motren GmbH
Rudiger Hass, Helmut Burger, Pay Brodersen, Hartmut Bartel, Per Bork
Abstract: In forging hammers, according to the present invention, more than one inlet valve is employed and more than one exhaust may be employed. The force of impact for a particular blow is controlled by the number of valves employed and the timing of the opening and closing of those valves relative to one another. By making successive adjustments with different combination of valves, the controls may be calibrated so that the same ram force may be repeated. Knowing the valve settings required to produce differing amounts of force, it is possible to program the settings into the memory of a computer, so that when a particular impact force is selected the appropriate valve timing will be reproduced and the desired force obtained. It is also possible to set up a sequence of blows of differing selected force, setting each blow using the computer memory.
Abstract: A turning gear is used to rotate a turbine rotor under conditions where it is heating up or cooling down without sufficient motive fluid to cause it to rotate. The turning gear avoid the occurence of a thermal bow. A hydraulic turning gear is disclosed for application in confined areas where a substantial force is required to provide rotation to the rotor. A booster cylinder is used to elevate low pressure fluid for use in a reduced diameter hydraulic cylinder. A ratchet wheel and pawl mechanism uses an adjustable friction force to withhold the pawl from the ratchet wheel after initial contact and further employs a stationary guide rail to reset the pawl for the next contact.
Abstract: A die forging hammer senses the pressure of striking air and the pressure of lifting air from within the cylinder as well as ram start position. Various empirical information is stored and available to a computer which uses the inputs to compute velocity ram position, rebound velocity and other pieces of information. In order to use the lifting air data, sequential pressure measurements are made by a microprocessor and stored for analysis and for use in deriving from stored empirical information about machine characteristics ram velocity and related information. Three types of systems are interwoven and may be used separately or simultaneously to control the blow control system. Different programs are employed, preferably using algorithms applicable to the equipment in processes to derive desired output or intermediate information.
January 5, 1987
Date of Patent:
September 15, 1987
Chambersburg Engineering Company
Charles J. Crout, Charles W. Frame, Ronald N. Harris
Abstract: A 4/2 type distributing control valve characterized by compactness, ruggedness and high sampling frequency, the valve comprising two index plates (6, 7), each having teeth about its perimeter, provided with axial switching bores (8, 9, 10, 11). The two switching bores for each plate are connected with a groove (12, 13) which extends over the center of the relevant index plate.
Abstract: This invention relates to a pneumatically actuated stepping valve for an automatic control of inlets and outlets for a pneumatic fluid. Each stepping movement is performed in response to a feedback signal indicating that an operation controlled by the valve has been completed. A distributing disc is provided for selecting consecutive pairs of ports consisting of an inlet port and an outlet port each. The stepping valve consists mainly of plastic parts, which contain numerous bores and passages and can be made at low cost. In accordance with the invention the valve disc cooperates with a sealing piston, which in response to pressure applied to said piston establishes connections to through passages of the valve disc, whereas when the piston is pressure-relieved it will be urged by spring means to disengage the valve disc so that the latter will not be restrained by the piston during its stepping movement.
Abstract: A sequencing valve mechanism utilized to control a pneumatic or hydraulic pressure medium from an on/off type pressure source to a two-chambered pneumatic or hydraulic appliance is disclosed. A pawl on a ratchet arm is driven around a ratchet island by the alternate application and withdrawal of pressure to the sequencing device. The ratchet arm is pivotally attached to a valve control arm which regulates a valve so as to control the output of a pressure source. The shapes of the ratchet island portions are such that two alternate applications and withdrawals of pressure are required for the pawl to complete one cycle about the island and, thereby, actuate the valve to different output positions only on alternate applications of pressure to the sequencing device.
Abstract: A system for providing a high pressure pulsating flow of cutting fluid includes a piston pump having a piston cylinder for pumping the cutting fluid and an air cylinder for reciprocatingly actuating the piston cylinder. An air-operated direction change-over valve controls supplying of air to one end of the air cylinder or the other from a compressed air source. A pulse frequency setting unit, including a fluidic NOT device, controls the position of the change-over valve pneumatically thereby determining the frequency of reciprocation of the air cylinder and thereby the frequency of pulsations in flow of the cutting fluid.
Abstract: Three radially extending push rods (26, 28, 30) make contact with an undulating cam surface on the periphery of a cam (10). The push rods (26, 28, 30) are driven inwardly by electrical solenoids (94, 96, 98) or fluid motors (106, 108, 110). At the end of each step, one of the push rods (26, 28, 30) is fully extended and in contact with the bottom of a valley region of the cam surface. The second push rod is in a partially extended position against a sloping surface between a peak and a valley. The third push rod is in a partially extended position against an oppositely sloping surface between a peak and a valley. The push rods (26, 28, 30) are located within the center plane of a relatively thin cam. In other installations, they are spaced axially apart or both circumferentially and axially apart. A cam surface twists (FIG. 7) as it extends axially to, in that manner, provide different cam positions under each of three axially spaced apart push rods. A plurality of cams are connected together.
Abstract: A rotary valve having a housing with a center section and a pair of end sections attached to the center section. A rotary shaft extending axially through the center section into said end sections with bearings in each end section rotatably supporting an end of the shaft. The center section and the end sections form a pair of axially aligned chambers within the housing and a cylindrical rotor is located in each chamber. Each rotor is fixed to the shaft for rotation with the shaft and each rotor has a continuous groove formed in its peripheral edge. A plurality of radially and angularly spaced arcuate slots are formed in each face of each rotor and a plurality of passages are formed in each rotor. The passages intersect the arcuate slots and the continuous groove to connect arcuate slots with other arcuate slots and with the groove. Passageways are formed in the end sections of the valve to connect the individual chambers with the exterior of the housing.
Abstract: A mechanism for moving an element in opposite directions includes a piston connected with the element. The piston reciprocates in a cylinder as high pressure fluid is alternately directed against one side or the other of the piston by a rotatable directional valve. The directional valve is rotated by a gerotor motor. A single rotatable valve element has passages at one end which form a commutator valve for the gerotor motor and ports at the other end which form the directional valve. A passage through the valve element connects the output of the gerotor motor with the directional valve ports. Cushioning means are provided to damp the motion of the piston at each end of its stroke to prevent impact with the ends of the cylinder.
Abstract: A fluid operated pumping system which includes a main power cylinder divided into a power chamber and a pump chamber by a reciprocally mounted power piston. An actuator piston is connected to the power piston for synchronous movement therewith and is reciprocably mounted in an actuator cylinder. A diaphragm type four-way transfer valve is interposed between a power fluid source and the main power cylinder and actuator cylinder, to both of which the valve is connected, and functions to alternately and cyclically charge power fluid at a relatively high pressure to the power cylinder and actuator cylinder, and to concurrently discharge power fluid at a relatively low pressure. The system further includes a needle valve controlled, diaphragm-type, astable pneumatic amplifier which is connected to, and controls the movement of, the transfer valve.
Abstract: A liquid motor is driven by pressurized wet glycol, received from an absorber of a natural gas dehydrating system, and utilizes the energy of the pressurized wet glycol to provide the primary source of energy for operating a pump for pumping of dry glycol from a reboiler to the absorber. A gas driven motor regulates the stroking rate of the glycol driven motor. The liquid motor and pump each have a two stage double acting piston in cylinders with fluid intake and exhaust valving and passages to alternately fill and exhaust the motor cylinders while the opposing pump cylinders are simultaneously alternately filled and exhausted. A spool type valve rod, associated with the glycol driven motor, is operated by the gas driven motor to regulate the rate of reciprocation of the glycol driven motor and to provide a secondary source of energy therefor.
Abstract: A pump system includes a source of fluid under pressure conveyed into a fluid chamber containing meshing gears which are rotated by the pressurized fluid to, in turn, transmit rotation to a unitary valve member positioned in a housing. Rotation of the gears also displaces fluid at a preselected flow rate through an inlet port of the housing and into a first inlet port of the rotary valve member. During the first one half cycle of rotation of the rotary valve member, fluid is conveyed through a first set of aligned outlet ports of the valve member and the valve housing to a water pump for displacing a water piston. The water piston is displaced to convey water through a first conduit. During the second one half cycle of rotation of the rotary valve member, fluid is conveyed through a second set of aligned outlet ports of the valve member and the valve housing to displace the water piston in an opposite direction to convey water through a second conduit.
Abstract: A compact and highly reliable proportioning pumping system for supplying a precise and controllable mixture of concentrate and water in a kidney dialysis machine comprises a central body and a pair of oppositely mounted pivotable linkages coupled to the body. A first pivotable linkage is coupled by connecting rods to a water metering piston and a concentrate metering piston respectively, a variable stroke ratio being provided by a signal actuated drive coupled to the linkage mechanism and controlling the relative position of the end of one of the connecting rods. The change of position is advantageously effected so as to maintain a precise proportionality between the flows delivered by each of the pistons throughout their variable stroke lengths. The range of proportioning adjustments can be mechanically limited and alarm conditions can readily be detected.
Abstract: An oscillator actuated hydraulic impulse of the type including a spool valve actuated by an alternating signal from an oscillator to switch the hydraulic pressure in a double acting cylinder in order to cause reciprocating motion of a piston which strikes a boring tool. The hydraulic impulse device further includes a means for controlling the transition from the impulse stroke to the return stroke of the piston. In some embodiments, the hydraulic impulse device may further include a means for varying the duration of the impulse stroke and the return stroke of the piston.
October 30, 1980
Date of Patent:
August 3, 1982
Mitsui Engineering and Shipbuilding Co., Ltd.
Abstract: A control valve has a first position in which it directs air under pressure to a wiper motor through a "run" line to actuate the motor to oscillate the wiper. The control valve has a second position in which it directs air through a park line to a valve complex which routes air unidirectionally to the motor to cause the wiper to assume a "park" or rest position. An overriding valve is interposed in the "park" line and is connected to the air pressure source. This valve is of the solenoid type and is intermittently operated by a timer upon its actuation to dispose the overriding valve in a first position in which the flow of "park" air through the override valve is interrupted for a brief period, to allow "run" air pressure to actuate the wiper in normal fashion, and then dispose the valve in a second position in which the "park" air is routed to the motor to temporarily halt the operation of the wiper. This sequence continues so long as the timer remains actuated.
Abstract: A hydraulic push drive for pusher centrifuges, having a rotating body with a cylindrical bore. The rotating body is provided with a piston rod and piston body therein. A rotary control valve is disposed in the rotating body. The rotary control valve is driven by a hydraulic motor and controls the application of pressure. A valve is slideably mounted in a coaxial bore in the piston rod in order to control the stroke center of the piston by pulse duration modulation of a controlled leakage flow.
Abstract: Switch means on the frame of a forging device senses when the ram and piston enter a first zone of a pneumatic cushion during retraction to initiate timing. If a predetermined time has expired before the ram leaves the first zone, the fluid inlet valve is opened. If not, switch means senses when the ram and piston enter a second zone to initiate a second timing. If a second predetermined time expires before the ram leaves the second zone, the fluid inlet valve is opened. If not, switch means senses when the ram and piston enter a third zone, and after a predetermined time the fluid inlet valve is opened. Thus, by sensing ram position and measuring time ram remains within each zone, the effective upward velocity (distance/time) is measured and adaptive controls applied.
Abstract: A fluid operated stepping motor comprising a cylinder housing having one or more fluid cylinders to alternately displace at least two cam engaging members when pressure from a pressure source is applied to one of the cylinders. The cam engaging members are diametrically opposed. A cam is secured relative to the cylinder housing and having a plurality of teeth asymmetrically disposed thereon, is also provided. Each tooth has a power profile surface and an idle profile surface. The power profile surface is slidingly engageable by one of the cam engaging members when pressure is applied to displace the said one cam engaging member axially whereby the power profile surface will cause relative rotational displacement between the cylinder housing and the cam.
Abstract: In a mineral mining installation employing a series of shifting rams for advancing a scraper-chain conveyor provided with a guide for a mining machine, a control system is used to provide a succession of small fluid doses to the rams. Control signals, preferably remotely generated, serve to actuate local valves to cause a selected one or group of piston and cylinder metering devices to alternately accept and expel pressure fluid from a working chamber. In this way a pre-determined volume of pressure fluid can be transferred to one or more of the rams to effect the shifting advancement. This volume of pressure fluid is made up from a succession of small fluid doses each a small fraction of the desired shifting distance so that by repeated cycles of the device or devices the ram or rams associated therewith can extend in fine defined increments.
Abstract: A hydraulic motor having a housing and a shaft journaled for rotation along the longitudinal axis of the housing. The shaft carries an eccentric on which is rotatably mounted a bearing block. The housing has a plurality of hydraulic cylinders grouped about the axis of the shaft in a common plane normal to the axis of rotation of the shaft with each cylinder having a hollow piston displaceable therein and biased in a direction toward the bearing block. The shaft and the eccentric have inlet and outlet passages communicating with the bearing block and adapted to communicate a source of hydraulic fluid pressure and an exhaust means respectively therewith. Means are provided on the eccentric for separating these passages from one another with the bearing block having a port communicating fluid from the aforementioned passages to the piston interior, whereby fluid pressure may be admitted to the cylinders in turn, one after another, during the operation of the motor to exert a direct thrust on the eccentric.
Abstract: A shaking machine for shaking core sand out of hollow castings includes a pair of coaxial cylinders containing pistons with piston rods arranged to grip a casting, and a rotating vane air valve for supplying compressed air alternately to each of the two cylinders.