EP0521271A1 - Hydraulisch betätigbarer Schwenkspanner - Google Patents

Hydraulisch betätigbarer Schwenkspanner Download PDF

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Publication number
EP0521271A1
EP0521271A1 EP92107984A EP92107984A EP0521271A1 EP 0521271 A1 EP0521271 A1 EP 0521271A1 EP 92107984 A EP92107984 A EP 92107984A EP 92107984 A EP92107984 A EP 92107984A EP 0521271 A1 EP0521271 A1 EP 0521271A1
Authority
EP
European Patent Office
Prior art keywords
piston
control
tensioning
piston rod
clamping
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.)
Ceased
Application number
EP92107984A
Other languages
German (de)
English (en)
French (fr)
Inventor
Liebhard Jung
Helmut Heel
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.)
Ott Maschinentechnik GmbH
Original Assignee
Ott Maschinentechnik GmbH
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 Ott Maschinentechnik GmbH filed Critical Ott Maschinentechnik GmbH
Publication of EP0521271A1 publication Critical patent/EP0521271A1/de
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B5/00—Clamps
    • B25B5/06—Arrangements for positively actuating jaws
    • B25B5/061—Arrangements for positively actuating jaws with fluid drive
    • B25B5/062—Arrangements for positively actuating jaws with fluid drive with clamping means pivoting around an axis parallel to the pressing direction
    • 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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/02—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member
    • F15B15/06—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member for mechanically converting rectilinear movement into non- rectilinear movement
    • F15B15/063—Actuator having both linear and rotary output, i.e. dual action actuator

Definitions

  • the invention relates to a hydraulically actuated swing clamp, in particular for clamping a workpiece or tool on a processing machine, with a clamping piston which can be axially displaceable in a clamping cylinder of a housing and can be acted upon on both sides, the piston rod of which is firmly connected to it and carries a clamping arm at its end projecting from the housing.
  • control piston arranged coaxially to the tensioning piston and axially displaceable relative to it, non-rotatably guided relative to the housing, which can be loaded on both sides, which carries a control piston rod projecting into a cavity of the tensioning piston and the tensioning piston rod, and with at least one helical control cam provided on the control piston rod, into which a control ball held in the tensioning piston or the tensioning piston rod or the like engages.
  • the housing has a control cylinder in the connection to the tensioning cylinder, in which the control piston is arranged.
  • the two cylinders arranged axially one behind the other are separated from one another by a partition, the control piston rod being guided in a non-rotatable manner in this partition. Due to the arrangement of the clamping cylinder and control cylinder one behind the other, this known swing clamp has a relatively large overall length.
  • the tensioning cylinder is first acted upon by hydraulic pressure medium, as a result of which the tensioning piston rod with the tensioning arm extends by the full stroke without rotating movement.
  • the control cylinder In the extended position of the tensioning piston, the control cylinder is acted upon by pressure medium, as a result of which the control piston with the control piston rod opposes one another moved to the tensioning piston. Since the control piston rod is held in a rotationally fixed manner, the helical control groove causes the tensioning piston and the tensioning piston rod to pivot about their common axis by 90 °. Now the tensioning piston is pressurized on its side facing the tensioning arm and retracts until the tensioning arm rests against the object to be tensioned and tightens it. The tensioning piston rod is relaxed and retracted in the reverse order. In order to enable and control the pressure medium supply to the clamping cylinder and the control cylinder, a total of four pressure medium lines and a control device with several control valves are required, which are to be actuated one after the other. This sequence control is relatively complex.
  • a hydraulically actuated swing clamp is known (DE 32 01 013 C2), in which a stationary control rod engages in a cavity of the clamping cylinder.
  • the control rod is provided with a control cam which is complicated to manufacture and which consists of a plurality of axially parallel sections which are connected to one another by helically running sections.
  • a control ball held in the tensioning piston engages in the control cam.
  • Two diametrically opposed control balls are provided.
  • the control curve is designed such that when the tensioning piston is acted on, the tensioning piston rod is first extended axially to a part of its length.
  • the control ball arrives in a helical section, as a result of which the control piston is swiveled by 90 ° with simultaneous axial movement.
  • the control ball returns to an axially extending section of the control cam. If the control piston is now loaded on the side facing the tensioning arm, the tensioning piston rod moves in without pivoting movement opposite direction until the tension arm comes to rest on the object to be tensioned.
  • the control ball enters another helical section of the control cam, whereby the tensioning piston rod is pivoted through 90 °.
  • This hydraulically actuated swing clamp also has a relatively large axial length, because in addition to the actual extension stroke of the piston rod, the piston rod must be extended a further distance so that the piston rod can be pivoted through 90 ° during this extension. It has also turned out to be a very great disadvantage that the pivoting movement takes place during the axial movement of the piston. At working pressures of 400 bar, the piston seals are subjected to heavy loads due to the combined axial and rotary movement. Piston seal manufacturers only advise in extreme emergencies to subject the seals to a combined movement.
  • control cam with several axially and helically extending sections, which must be precisely matched to each other, is difficult to manufacture, practice has shown that if the piston is not fully extended, the tips and deflection points of the control cams can be damaged.
  • the invention is therefore based on the object of providing a hydraulically actuated swing clamp of the type mentioned at the outset, which has a relatively short overall length and whose control is simple.
  • control piston can be displaced axially to a limited extent in a cylinder space of the tensioning piston, that the side of this cylinder space facing the tensioning piston rod is at least partially connected via a connecting line to that side of the tensioning cylinder which is also penetrated by the tensioning piston rod is connected that the control piston rod can be rotated about its common axis relative to the control piston and that a free-wheel which blocks the rotation of the control piston rod in one direction of rotation is provided between the two parts.
  • the new swing clamp has a smaller axial length than known swing clamps. This is mainly achieved in that the tensioning piston also forms the cylinder space for the control piston. In addition, the control of the new swing clamp is particularly easy. It is only necessary to control the pressure medium supply to the clamping cylinder, which also requires only two pressure medium supply lines. If pressure is applied to the tensioning piston to extend it on one side, it extends without rotating movement up to a stop at the end of the tensioning cylinder. Simultaneously with the tensioning piston, the control piston, which is also adjacent to one side of the tensioning cylinder, is pressurized with pressure medium. During the stroke movement of the tensioning piston, the control piston does not initially move relative to the tensioning piston.
  • the control piston rod which is prevented from rotating by the freewheel, causes a pivoting movement of the tensioning piston and with it via the helical control groove connected tensioning piston rod by 90 ° without an axial movement of the tensioning piston taking place. This protects the seals of the tensioning piston since either only an axial movement or only a swiveling movement of the tensioning piston takes place.
  • the side of the tensioning piston facing the tensioning arm is pressurized with pressure medium. As a result, the clamping arm comes into contact with the object to be clamped.
  • pressure medium can also reach the side of the cylinder chamber facing the tensioning piston rod via the connecting line, as a result of which the control piston is moved back in its starting position with respect to the tensioning piston. Since the clamping arm rests on the object to be clamped, this also prevents the clamping piston rod from rotating. The control piston rod can, however, rotate relative to the tensioning piston when the control piston is lifted thanks to the freewheel.
  • the new swing clamp includes an automatic sequence control, without the need for complicated control parts.
  • the housing 1 has a clamping cylinder 2, in which the clamping piston 3 is guided axially.
  • the tensioning piston 3 is firmly connected to the tensioning piston rod 4, which carries the tensioning arm 5 at its free end 4a.
  • the tensioning arm 5 has two arms 5a, 5b arranged diametrically to one another.
  • the tensioning piston 3 can be acted upon on both sides via the lines 6 and 7 provided in the housing 1.
  • the tensioning piston 3 has a cylinder space 8, in which a control piston 9 is axially displaceable.
  • a connecting line 10 is also provided in the tensioning piston 3, which connects the side 8a of the cylinder space 8 facing the tensioning piston rod 4 to that side 2a of the tensioning cylinder 2 which is also penetrated by the tensioning piston rod 4.
  • a spring-loaded check valve 11 can be arranged in this connecting line, the valve body 11a of which normally closes the connection between the side 8a of the cylinder space 8 and the side 2a of the tensioning cylinder 2.
  • an unlocking pin 12 which can be displaced parallel to the tensioning piston rod 4, the lower end of which cooperates with the valve body 11a and the upper end of which, at the end of the extension stroke of the tensioning piston 3, as shown in FIG. 2, on a stationary stop 13 in the form of a securing ring triggers.
  • the control piston rod 14 is rotatably mounted in the control piston 9. However, their rotational movement relative to the control piston 9 is blocked in one direction of rotation by the freewheel 15 provided between the two parts 9, 14.
  • the control piston rod 14 has on two diametrically opposite sides a helical cam 16 which extends over a 90 ° circumferential angle of the control piston rod.
  • a control ball 17 engages in each of the two control cams 16 and is held rotatably in the tensioning piston 3.
  • the control piston rod 14 projects into a cavity 18 of the tensioning piston rod 4.
  • a guide rod 19 is provided coaxially with the control piston 9 and is firmly connected to the housing 1 via a screw 20.
  • the guide rod 19 projects into a cavity of the hollow control piston 9 and the control piston rod 14. It has an axially parallel guide groove 21 on two diametrically opposite sides.
  • the control piston 9 is pressed down relative to the tensioning piston 3, since rotation of the tensioning piston 3 is blocked by the tensioning arm 5 lying against the object to be tensioned and the control balls 17 continue to engage in the control cams 16, which rotates during the downward displacement of the control piston 9 Control piston rod 14.
  • the freewheel allows the control piston rod 14 to rotate relative to the control piston 9.
  • the side of the tensioning cylinder 2 build up a high pressure, whereby a clamping pressure acting in the direction of the housing 1 is exerted on the clamping arm 5.
  • the lower side 2b of the tensioning cylinder 2 is again pressurized and the tensioning piston 3 moves upwards together with the control piston 9 in the previously described manner until it rests against the stop ring 24 and by opening the check valve 11 a further pivoting movement of the tensioning piston 3 is initiated by 90 °.
  • the tensioning piston 3 moves downwards again in the manner described above until either the tensioning arm 5 comes into contact with another object to be tensioned, or if none renewed tension is to be performed, the tensioning piston 3 abuts the shoulder 25.
  • the control piston 9 is then pressed down relative to the stationary tensioning piston 3 in the previously described manner until it rests on the stop ring 23 and the initial position of all parts of the swing clamp is thus reached again.
  • the hydraulically operated swing clamp can be used for a wide variety of clamping purposes. It is also particularly suitable for quickly clamping and releasing press tools on the press table or on a press ram. It enables simple tool change, since the clamping arm, as shown in FIG. 1, can be completely drawn into the housing and therefore no protruding parts are present when the tool is inserted.
  • the check valve 11 with the unlocking pin 12 provided in the connecting line 10 can also be omitted. Sufficient internal friction is present between the two pistons 3, 9 and the helical control cam 16 and the control balls 17, which together with a certain throttling effect in the connecting line 10 and the fact that when the tensioning piston 3 extends out of the upper cylinder chamber 2a, pressure medium is displaced a pivoting movement of the tensioning piston 3 must be prevented until it comes to rest against the stop ring 24 according to FIG.
  • the check valve 11 is advantageous, however, if the extension movement is hindered by the tensioning piston rod 4 or the tensioning arm 5 striking any obstacles. This would then lead to premature, unwanted pivoting of the tensioning piston 3 and the tensioning piston rod 4.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Jigs For Machine Tools (AREA)
EP92107984A 1991-07-04 1992-05-12 Hydraulisch betätigbarer Schwenkspanner Ceased EP0521271A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4122181 1991-07-04
DE19914122181 DE4122181C1 (enrdf_load_stackoverflow) 1991-07-04 1991-07-04

Publications (1)

Publication Number Publication Date
EP0521271A1 true EP0521271A1 (de) 1993-01-07

Family

ID=6435443

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92107984A Ceased EP0521271A1 (de) 1991-07-04 1992-05-12 Hydraulisch betätigbarer Schwenkspanner

Country Status (2)

Country Link
EP (1) EP0521271A1 (enrdf_load_stackoverflow)
DE (1) DE4122181C1 (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113188486A (zh) * 2021-05-08 2021-07-30 重庆市鼎喜实业有限责任公司 浮动多点压紧机构以及新能源汽车零配件检测装置
EP4480630A3 (de) * 2023-06-22 2025-02-26 Andreas Maier GmbH & Co. KG Spannvorrichtung

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113732767B (zh) * 2021-09-03 2022-12-13 深圳市傲顺精密科技有限公司 定位机构、夹具装置及加工设备

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2456878A1 (de) * 1974-12-02 1976-08-12 Hiroshi Teramachi Druckmittelbetaetigter stellzylinder
GB1541898A (en) * 1977-09-23 1979-03-14 Spenklin Ltd Power-operated work clamping devices

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4560152A (en) * 1984-04-27 1985-12-24 Applied Power Inc. Swing clamp
DE3430930A1 (de) * 1984-08-22 1986-03-06 Applied Power, Inc., Milwaukee, Wis. Schwenkspanner
DE3438185A1 (de) * 1984-10-18 1986-04-24 Johann Weiss Maschinenbau, 7799 Illmensee Druckmittelbetaetigter spannzylinder mit sicherheitsabschaltung
US4799657A (en) * 1987-11-24 1989-01-24 Applied Power Inc. Swing clamp

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2456878A1 (de) * 1974-12-02 1976-08-12 Hiroshi Teramachi Druckmittelbetaetigter stellzylinder
GB1541898A (en) * 1977-09-23 1979-03-14 Spenklin Ltd Power-operated work clamping devices

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113188486A (zh) * 2021-05-08 2021-07-30 重庆市鼎喜实业有限责任公司 浮动多点压紧机构以及新能源汽车零配件检测装置
EP4480630A3 (de) * 2023-06-22 2025-02-26 Andreas Maier GmbH & Co. KG Spannvorrichtung

Also Published As

Publication number Publication date
DE4122181C1 (enrdf_load_stackoverflow) 1993-01-07

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