US3388780A - Buffer device - Google Patents

Buffer device Download PDF

Info

Publication number
US3388780A
US3388780A US589378A US58937866A US3388780A US 3388780 A US3388780 A US 3388780A US 589378 A US589378 A US 589378A US 58937866 A US58937866 A US 58937866A US 3388780 A US3388780 A US 3388780A
Authority
US
United States
Prior art keywords
conduit
piston
stop
pressure
valve
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
Application number
US589378A
Other languages
English (en)
Inventor
Sedlacek Franz
Winkler Karl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of US3388780A publication Critical patent/US3388780A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
    • B21C47/24—Transferring coils to or from winding apparatus or to or from operative position therein; Preventing uncoiling during transfer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G37/00—Combinations of mechanical conveyors of the same kind, or of different kinds, of interest apart from their application in particular machines or use in particular manufacturing processes

Definitions

  • ABSTRACT OF THE DISCLOSURE A yieldable stop for gently braking stock moving on a conveyor, which is connected to the piston of a hydraulic shock absorber.
  • a take-up conduit is connected to that end of the shock absorber cylinder toward which the piston moves in response to an impact, a pressure limiting valve is connected to the conduit, a throttle is positioned in the conduit between the cylinder and the pressure limiting valve, a check valve is positioned in the conduit between the cylinder and the throttle, and a pressure accumulator is connected to the conduit between the check valve and the pressure limiting valve.
  • coiled strip In rolling mills, particularly in cold rolling mills, coiled strip must be fed to and from various units, such as rolling units, pickling lines, shear lines, rewinders and the like. As a rule, feeding is effected on roller beds, roller type conveyors and similar conveying devices. To avoid damage to the surface of the coils and to prevent a rupture of the binding straps, the feeding movements of the coils must be gently braked.
  • Buffer devices which are known for this purpose comprise a stop which is cushioned by strong springs or pneumatic dashpots. These known devices have the disadvantage that they recoil so that the coils often rebound several times from the stops. Such rebounding may cause a rupture of the holding straps or other damage to the coil. In many cases it is required to move the braked coil for the subsequent processing step or to disengage the coil from the stop. The known bulfer devices do not meet this requirement. Finally, the dimensions of the previous buffer devices are too large in many cases for installation in a confined space.
  • the invention resides essentially in that the stop is connected to the piston of a hydraulic cylinder, which at its forward end in the direction of impact is connected by a conduit and an interposed check valve to a pressure accumulator and a pressure limiting valve, which is preceded by a throttle.
  • the impact of the rolled stock on the stop causes a movement of the piston so that the liquid is forced from the forward end of the cylinder, considered in the direction of impact, into the accumulator and part of this liquid is exhausted through the throttle and the pressure limiting valve.
  • the intercepting operation will be terminated and the piston will be stopped when the kinetic energy of the rolled stock has been converted into energy stored in the pressure accumulator and into work performed at the throttle and in the pressure limiting valve.
  • the check valve reliably prevents an application of backpressure from the accumulator to the piston so that the rolled stock will not 3,3383% Patented June 18, 1968 rebound.
  • the accumulator pressure can be gradually reduced through the throttle and the pressure limiting valve to a desired prestressing value, which is preset.
  • the stop and the hydraulic cylinder, on the one hand, and the pressure accumulator and the valves, on the other hand, may be mounted at a distance from each other for optimum utilization of the space which is available, provided that the connecting conduit is short so that the liquid column to be moved during the intercepting operation is as small as possible.
  • a control conduit which is controlled by a shut-off valve and adapted to be connected to a pressure source, opens into the conduit which leads from the cylinder to the check valve.
  • the control valve is closed so that the control conduit is inoperative.
  • the piston is moved in the reverse direction so that the stop is moved to its initial position or the rolled stock is previously moved to its position for the next processing step.
  • each side of the piston is connected by a conduit incorporating a check valve to the common pressure accumulator and the common pressure limiting valve preceded by a throttle, two control conduits are provided, and the control valve is adapted to close both control conduits at the same time and to connect one of them to the pressure source and the other to a drain, and vice versa.
  • a device can intercept stock arriving from both directions and can displace the piston in both directions when the intercepting operation has been terminated. This displacement of the piston may serve to change the position of the stopped stock, or to disengage the stop from the stock, or to move the stop to its initial position for the next intercepting operation.
  • the pressure accumulator might consist of a pressure cylinder having an accumulator bag and filled with nitrogen.
  • the pressure accumulator may comprise a gasor spring-cushioned piston.
  • the latter type of accumulator has the advantage that its initial stress can easily be changed.
  • FIG. 1 is a diagram of the hydraulic system of the buffer device according to the invention
  • FIG. 2 is an axial view showing the pressure accumulator as a detail
  • FIGS. 3 and 4 are front and side elevations, respectively, showing a portion of a conveyor for rolied stock, which conveyor is provided with the butter device according to the invention.
  • FIGS. 5 and 6 are fragmentary sectional views showing two further embodiments of the buffer device.
  • the oncoming rolled stock impinges on a stop 1, which is connected by a rod 2 to a piston 3 of a hydraulic cylinder 4. Both ends of the cylinder are connected by respective conduits 5 incorporating respective check valves 6 to a common conduit 7, which leads to a pressure accumulator 8 and through a throttle 9 to a pressure limiting valve 10.
  • the conduit 7 terminates in a relief valve 11.
  • the two valves 10, 1]. are connected to a common return conduit 12.
  • Two control conduits 13 open into the conduits and are provided with a control slide valve 14 for jointly closing both control conduits 13 (in the position shown in the drawing) and for connecting one control conduit to a pressure conduit and the other control conduit to a drain conduit 16, and vice versa.
  • Two valve combinations 17 serve for adjusting the speed of the piston movement.
  • Each control conduit 13 is connected by a further check valve 18 to a suction conduit 19.
  • the conduits 12, 16, 19 may be combined in a common conduit.
  • the hydraulic cylinder 4, the pressure accumulator 8 and the throttle 9 as well as the pressure limiting valve 10 are so designed that the impact of rolled stock having the highest kinetic energy to be expected will move the piston to a position which is short of its right-hand end position and will not cause a pressure rise above the setting of the relief valve 11.
  • the check valve 6 prevents an application of back-pressure from the accumulator to the piston 3.
  • the accumulator pressure is released through the throttle 9 and the pressure limiting valve 10. During the movement of the piston in response to the impact, liquid is sucked on the left-hand end of the piston through conduit 19 and the associated check valve 18 so that the occurrence of a vacuum on this side is prevented.
  • the control valve 14 can be actuated to cause a movement of the piston 3 in one direction or the other so as to move the rolled stock in contact with the stop 1 to the position required for the next processing step or to disengage the stop from the rolled stop.
  • the control valve 14 is actuated to cause the piston 3 to move the stop 1 to its initial position.
  • the control valve then returns or is returned to its intermediate or closed position so that the device is ready for the next intercepting operation.
  • the piston 3 will be in its right-hand end position, shown in dotted lines.
  • the operation is analogous. In a device for intercepting rolled stock arriving always from the same direction, the hydraulic system will be simplified in that only one check valve 6 and one check valve 18 are required.
  • the pressure accumulator 8 may comprise a springloaded piston, as is shown in FIG. 2.
  • This accumulator comprises a housing 10 having screw-threaded ends 21, 22, and a piston 23, which is guided in the housing and loaded by a spring 24. The latter bears on a spring abutment 25, which can be adjusted by an adjusting screw 26 to vary the initial stress of the spring. Pressure is applied to the piston 23 through conduit 7.
  • strip coils 27 are selectively fed on inclined feeding roller beds 28, 29.
  • Another roller bed 30 is provided between the two feeding roller beds 28, 29 and can be pivotally moved to one side or the other into alignment with one of the feeding roller beds 28, 29 or the other.
  • the pivoted roller bed 30 comprises a guideway 31, in which a carriage 32 is reciprocable, which carries the stop 1.
  • the piston rod 2 is pivoted to the carriage 32.
  • the hydraulic cylinder 4- is pivoted to the frame of the apparatus. To intercept a strip coil 27 coming from the left-hand feeding roller conveyor 28, the stop 1 will be in its left-hand end position, shown in the drawing. In response to the impact, the stop is moved to the right until the rolled stock has been stopped.
  • the stop consists of a roller 1a, which is mounted on a pivoted arm 33 pivotally connected to the piston rod 2 of the pivoted hydraulic cylinder 4.
  • the strip coil 27 is rolled on an inclined ramp 34 and a transition portion 35 and impinges on the stop 1a, which is in the position shown on the drawing. This impact,
  • the device shown in FIG. 6 is similar to that of FIG. 5 with the diiference that a V-shaped roller bed 38 is provided instead of the coil carriage 36.
  • the coil 27 does not yet lie on the rollers of the roller bed 38.
  • a further operation of the pivoted arm 33a causes the coil to be deposited on the roller bed 38.
  • the stop roller 1a is then disengaged from the coil, which can now be conveyed further.
  • a buffer device for intercepting articles which comprises a hydraulic cylinder, a piston slidable in said hydraulic cylinder, a stop adapted to be subjected to an impact by an article to be intercepted, said stop being operatively connected to said piston to move the same in said cylinder in response to such impact, a take-up con-' duit connected to that end of the cylinder toward which the piston is moved in response to such impact, a pressure limiting valve connected to said conduit, a throttle incorporated in said conduit between said cylinder and said pressure limiting valve, a check valve incorporated in said conduit between said cylinder and said throttle, and a pressure accumulator connected to said conduit between said check valve and said pressure limiting valve.
  • a buffer device as claimed in claim 1 which comprises a control conduit connected to said take-up conduit between said cylinder and said check valve, and a control valve operable to alternatively close said control conduit and to connect it to a pressure source.
  • a butter device as claimed in claim 1 which comprises a second take-up conduit which incorporates another check valve and connects the other end of said cylinder to the first-mentioned take-up conduit between said first-mentioned check valve and said throttle, a second control conduit, and a drain conduit, said control valve being operable to close both said control conduits and to connect one of said control conduits to a pressure source and the other to said drain conduit, and vice versa.
  • a buffer device as claimed in claim 3 which comprises a suction conduit and two additional check valves each of which connects said suction conduit to one of said control conduits.
  • a buffer device which comprises a hydraulic cylinder, a piston slidable in said hydraulic cylinder, a stop disposed in said path and arranged to be subjected to an impact by rolled stock moving along said path, said stop being operatively connected to said piston to move the same in said cylinder in response to such impact, a take-up conduit connected to that end of the cylinder toward which the piston is moved in response to such impact, a pressure limiting valve connected to said conduit, a throttle incorporated in said conduit between said cylinder and said pressure limiting valve, 21 check valve incorporated in said conduit between said cylinder and said throttle, and a pressure accumulator connected to said conduit between said check valve and said pressure limiting valve.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Advancing Webs (AREA)
US589378A 1965-11-09 1966-10-25 Buffer device Expired - Lifetime US3388780A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT1008265A AT269044B (de) 1965-11-09 1965-11-09 Puffervorrichtung zum Abfangen von rollendem oder gleitendem Walzgut

Publications (1)

Publication Number Publication Date
US3388780A true US3388780A (en) 1968-06-18

Family

ID=3619751

Family Applications (1)

Application Number Title Priority Date Filing Date
US589378A Expired - Lifetime US3388780A (en) 1965-11-09 1966-10-25 Buffer device

Country Status (4)

Country Link
US (1) US3388780A (de)
AT (1) AT269044B (de)
DE (1) DE1527758A1 (de)
GB (1) GB1107679A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103979318A (zh) * 2014-05-28 2014-08-13 龙岩烟草工业有限责任公司 烟丝储柜用铺料车装置
CN111920258A (zh) * 2020-07-07 2020-11-13 湖南工程学院 一种可调式家居用床

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT350337B (de) * 1977-06-17 1979-05-25 Sticht Walter Stossdaempferanordnung, insbesondere fuer montagemaschinen
AT390597B (de) * 1984-02-06 1990-05-25 Sticht Walter Vorrichtung zum positionieren bzw. arretieren von werkstuecken
IT1186416B (it) * 1985-12-09 1987-11-26 Mpa Meccanizzazione Postale & Impianto di trasporto a rulle e procedimento per far avanzare sacchi,pacchi e simili su rulliere
US5064046A (en) * 1990-10-15 1991-11-12 Ford Motor Company Flexible conveying device
US5123517A (en) * 1990-10-30 1992-06-23 Lake Erie Welding & Fabricating Low profile unpowered conveyor and method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2624440A (en) * 1951-06-09 1953-01-06 Armstrong Cork Co Device for controlling movement of a member on a conveyer
US2846041A (en) * 1957-05-08 1958-08-05 United States Steel Corp Retractable coil stop
US2931478A (en) * 1957-08-23 1960-04-05 United States Steel Corp Hydraulic arrestor for inclined ramp

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2624440A (en) * 1951-06-09 1953-01-06 Armstrong Cork Co Device for controlling movement of a member on a conveyer
US2846041A (en) * 1957-05-08 1958-08-05 United States Steel Corp Retractable coil stop
US2931478A (en) * 1957-08-23 1960-04-05 United States Steel Corp Hydraulic arrestor for inclined ramp

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103979318A (zh) * 2014-05-28 2014-08-13 龙岩烟草工业有限责任公司 烟丝储柜用铺料车装置
CN103979318B (zh) * 2014-05-28 2016-04-27 龙岩烟草工业有限责任公司 烟丝储柜用铺料车装置
CN111920258A (zh) * 2020-07-07 2020-11-13 湖南工程学院 一种可调式家居用床

Also Published As

Publication number Publication date
DE1527758A1 (de) 1970-03-19
GB1107679A (en) 1968-03-27
AT269044B (de) 1969-03-10

Similar Documents

Publication Publication Date Title
US2763229A (en) Loading and unloading apparatus
US2918852A (en) Mechanism for stagger piling of metal sheets
US20100230236A1 (en) Stop Device
JPS59194931A (ja) 紙加工機において紙堆積体を取出すための装置
US3039623A (en) Automatic press material handling apparatus
US20200339364A1 (en) Stop device for a conveyor system
US3894477A (en) Follow-up control device
US3658190A (en) Automatic workpiece loader and unloader
GB981772A (en) Apparatus for aligning and spacing articles of a conveyor
DE3622980A1 (de) Anhalte-/stossdaempfervorrichtung fuer transportierte gegenstaende
RS65356B1 (sr) Valjkasti transporter sa kočionim uređajem
US7497527B2 (en) Reshaping device with ejector and method of ejecting workpieces
US3173554A (en) Conveyor transfer device
US3155242A (en) Device for the stopping and accurate positioning of a moving body
US2624440A (en) Device for controlling movement of a member on a conveyer
US5363729A (en) Shearing machine
US4325476A (en) Apparatus for merging articles from two conveyor lines into one conveyor line
US4489824A (en) Apparatus for stopping articles on a conveyor
US5062333A (en) Shearing machine
US3694966A (en) Belt grinding machine
GB1107679A (en) Improvements in or relating to buffer devices for intercepting rolling or sliding rolled stock
US3213999A (en) Transfer device for conveyor interchange
US5195414A (en) Shearing machine
US3479924A (en) Piston type operator with power checking
US3407951A (en) Load clamp with arm travel retarding means