Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
  • B21B31/16—Adjusting or positioning rolls
  • B21B31/20—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis
  • B21B31/32—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis by liquid pressure, e.g. hydromechanical adjusting
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
  • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
  • F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
  • F15B11/036—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force by means of servomotors having a plurality of working chambers
  • F15B11/0365—Tandem constructions
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B2211/00—Circuits for servomotor systems
  • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
  • F15B2211/205—Systems with pumps
  • F15B2211/2053—Type of pump
  • F15B2211/20538—Type of pump constant capacity
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B2211/00—Circuits for servomotor systems
  • F15B2211/30—Directional control
  • F15B2211/305—Directional control characterised by the type of valves
  • F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B2211/00—Circuits for servomotor systems
  • F15B2211/30—Directional control
  • F15B2211/32—Directional control characterised by the type of actuation
  • F15B2211/327—Directional control characterised by the type of actuation electrically or electronically
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B2211/00—Circuits for servomotor systems
  • F15B2211/60—Circuit components or control therefor
  • F15B2211/63—Electronic controllers
  • F15B2211/6303—Electronic controllers using input signals
  • F15B2211/6336—Electronic controllers using input signals representing a state of the output member, e.g. position, speed or acceleration
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B2211/00—Circuits for servomotor systems
  • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
  • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
  • F15B2211/7051—Linear output members
  • F15B2211/7055—Linear output members having more than two chambers
  • F15B2211/7056—Tandem cylinders
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B2211/00—Circuits for servomotor systems
  • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
  • F15B2211/76—Control of force or torque of the output member

Definitions

• This invention relates to an assembly of two hydraulic rams.
• the present invention relates to an assembly of a first ram comprising a housing defining an open-ended cylinder, a piston displaceable in the cylinder and means for introducing fluid under pressure into the cylinder to displace the piston in the direction towards the open end of the cylinder; and a second ram comprising a housing defining a cylinder and a piston displaceable in the cylinder, characterised in that the cylinder of the second ram is in communication with the cylinder of the first ram through an opening in the housing of the first ram which is opposite the open end of the cylinder, means for introducing fluid under pressure into the cylinder of the second ram to displace the piston in the direction towards the opening and the piston of the second ram having an extension which projects through the opening in the housing and is engageable with the piston of the first ram.
• the engaging surfaces of the extension and the piston of the first ram are such as to permit limited relative inclination between the axis of the extension and the axis of the cylinder of the first ram.
• the first ram only is employed or the two rams can be operated together.
• the extension of the piston in the second ram is engageable with the piston of the first ram, but is not permanently connected thereto, when hydraulic fluid is introduced into the cylinder of the first ram, it acts against the full surface of the piston therein and it also acts against the extension to displace the piston in the second ram in the direction to separate the extension from the piston in the first ram.
• only one seal i.e. that between the piston of that ram and the cylinder wall, is employed. This permits slight tilting between the piston and the cylinder wall.
• the ram assembly is used to displace a chock 1 of a rolling mill stand relative to a fixed housing 2 of the mill stand.
• An assembly according to the present invention is located in a recess 3 formed in the housing.
• the assembly consists of a housing 4 having a side wall 5 and an end wall 6 and together they define a cylinder 7 which is open-ended.
• a piston 8 having a wall seal 9 is displaceable in the cylinder 7 to constitute a ram.
• a further housing 10 which has a slide wall 11 and an end wall 12 and together with the end wall 6 of the first ram they define a cylinder 13.
• a piston 15 is displaceable in the cylinder 13 to constitute a ram and there is a seal 16 between the piston 15 and the wall of the cylinder.
• the piston has an extension 17 which projects through an opening 18 in the end wall 6 of the housing 4 and there is a seal 19 between the extension and the wall of the opening.
• the lower end of the extension projects into the cylinder 7 and is engageable with the adjacent surface of the piston 8. It is preferable for the end face of the extension 17 and the adjacent face of the piston 8 to be of convex and concave form, respectively, so that limited inclination can take place between the piston 8 and the extension and there can be relative inclination between the longitudinal axis of the extension and that of the cylinder 7.
• the part of the cylinder 13 which is between the piston 15 and the wall 6 of the housing 4 is kept open by way of a permanent connection 20 to drain.
• the part of the cylinder 13 above the piston 15 is connected by a fluid line to a port on a solenoid valve 21 and the cylinder 7 is also connected to a port on the solenoid valve 21 by a fluid line.
• the solenoid valve has a connection from a controllable hydraulic source 22 directly to the cylinder 7 and the part of the cylinder 13 above the piston 15 is connected through the solenoid valve to drain.
• transducers can be employed to give an indication of the relative positions of the pistons with respect to the fixed mill housings 2.

Applications Claiming Priority (2)

Publications (1)

Family

ID=10579855

Family Applications (1)

Country Status (2)

Cited By (3)

Citations (4)

• 1985
  • 1985-05-29 GB GB858513553A patent/GB8513553D0/en active Pending
• 1986
  • 1986-05-23 EP EP86303944A patent/EP0203794A1/fr not_active Withdrawn

Patent Citations (4)

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