WO1995003592A1 - Lastwechselzähler - Google Patents
Lastwechselzähler Download PDFInfo
- Publication number
- WO1995003592A1 WO1995003592A1 PCT/EP1994/002444 EP9402444W WO9503592A1 WO 1995003592 A1 WO1995003592 A1 WO 1995003592A1 EP 9402444 W EP9402444 W EP 9402444W WO 9503592 A1 WO9503592 A1 WO 9503592A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- counter
- piston
- load change
- housing
- groove
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06M—COUNTING MECHANISMS; COUNTING OF OBJECTS NOT OTHERWISE PROVIDED FOR
- G06M1/00—Design features of general application
- G06M1/08—Design features of general application for actuating the drive
- G06M1/12—Design features of general application for actuating the drive by fluid means
- G06M1/126—Design features of general application for actuating the drive by fluid means by hydraulic means
-
- 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
- B25B29/00—Accessories
- B25B29/02—Bolt tensioners
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06M—COUNTING MECHANISMS; COUNTING OF OBJECTS NOT OTHERWISE PROVIDED FOR
- G06M1/00—Design features of general application
- G06M1/04—Design features of general application for driving the stage of lowest order
- G06M1/041—Design features of general application for driving the stage of lowest order for drum-type indicating means
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06M—COUNTING MECHANISMS; COUNTING OF OBJECTS NOT OTHERWISE PROVIDED FOR
- G06M1/00—Design features of general application
- G06M1/08—Design features of general application for actuating the drive
- G06M1/083—Design features of general application for actuating the drive by mechanical means
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06M—COUNTING MECHANISMS; COUNTING OF OBJECTS NOT OTHERWISE PROVIDED FOR
- G06M1/00—Design features of general application
- G06M1/08—Design features of general application for actuating the drive
- G06M1/12—Design features of general application for actuating the drive by fluid means
- G06M1/123—Design features of general application for actuating the drive by fluid means by pneumatic means
Definitions
- the invention relates to a Las * '- echselloiser to a periodically pressurized actuating device, in particular on a hydraulic screw tightening cylinder.
- Screw tensioning cylinders have the task of applying a precisely specified pre-tensioning force to a screw bolt in order to be able to tighten or loosen the nut screwed onto the screw bolt.
- the screw clamping cylinder is screwed onto the protruding thread above a nut and then the
- Screw tensioning cylinder put under hydraulic pressure. As a result, the screw bolt. is stretched by lengths. The forces exerted on the bolts are extremely high, which places high demands on the bolt tensioning cylinder and its individual parts. In order to prevent these highly stressed individual parts from breaking when a bolt is tightened because a fatigue fracture occurs because the number of load cycles that can be absorbed by this part is exceeded, the aim is to replace the parts at risk of fatigue fracture before such a fatigue fracture can occur. This also applies to the complete replacement of other wear parts, such as. B. the seals.
- the German Offen ' .. ⁇ -: * • ungsschrift 35 12 568 describes a stroke counter for parts moved to and fro, such as piston rods, press rams, which have a sensor arrangement made up of two sensors which are arranged at a distance in the direction of movement and respond to the moving part , both of which lie within the stroke interval, with an associated evaluation circuit cooperate in such a way that it only runs through the output signal of one of the sensors for counting the strokes and only if the output signal of the other sensor has previously been received.
- This arrangement serves to achieve a reliable counting of strokes, even if the stroke fluctuates due to varying movement conditions of the reciprocating part, e.g. B. changing friction or different sizes of loads that are driven by the part.
- the two sensors of the sensor arrangement are arranged away from both ends of the stroke in an area of the working stroke which is surely traversed even when the movement conditions fluctuate. This means that no strokes are lost when counting. Since this known stroke counter does not record the load conditions, but * - is explicitly designed to count each stroke, even if the stroke length fluctuates, empty strokes are also counted in these known ⁇ - ⁇ r stroke counters, which, however, are monitored for fatigue failure or the Wear of seals has no meaning.
- the known stroke counter is less suitable as a load change counter for actuators of the type mentioned, since with this stroke counter more strokes are counted than for the replacement of highly stressed individual parts in order to prevent fatigue breakage, so that they actually have to be counted when using the known stroke counter, these parts are replaced in general and unnecessarily too early.
- the invention has for its object to provide a load change counter that simply counts the pressure loads to be considered for the replacement of fatigue-endangered, highly stressed individual parts in order to be able to determine after a predeterminable number of load changes, replace heavily used parts.
- a load change counter is proposed which, according to the invention, has a cylinder connected to the pressurization of the actuating device via a pressure connection, a displaceable piston arranged in a sealed manner in the cylinder and a counter which can be advanced by the axial piston movement.
- the counter is thus coupled to the piston via a mechanism which converts the linear movement of the piston into a cyclical rotary movement of the counter via a spring element which is designed in accordance with the piston diameter and the hydraulic pressure.
- the periodic pressurization of the actuating device which is to be monitored, is used to move a piston which is arranged in a sealed manner in the cylinder each time.
- the axial piston movement causes a switching of the counter, so that any pressurization of the actuator, for. B. every time a bolt is tightened by means of a screw tensioning cylinder, the counter is switched on.
- the piston can have a V-groove on its end face facing the counter and the counter can have a corresponding driver wedge rotated with respect to the V-groove, whereby the driver wedge is rotated by one counting unit of the counter by each axial movement of the piston.
- the load change counter has a solid, one-piece housing.
- the piston can be made in two parts, one part of which is sealed in a bore in a housing and rests with a collar on a surface of a housing recess, while the other part has the V-groove, coaxially Guided against rotation in the housing and arranged coaxially to the counter arranged in a further housing recess and readable via a side viewing window.
- a spring element can be arranged between the collar and a housing surface of the recess, which returns the piston to its original position when pressure relief occurs.
- the spring element can be dimensioned with respect to the piston surface in such a way that the counter is actuated at a specific predeterminable pressure.
- the housing recess, through which the second part of the piston is guided, can have a lateral opening for inserting the compression spring and parallel end faces for engaging the piston collar and the compression spring. Furthermore, the housing recess for the counter can have an end opening and a coaxial bore for inserting the second part of the piston and the counter, and the second part of the piston can be secured against rotation by a screw or pin which engages radially in a longitudinal groove.
- the load change counter according to the invention is an autonomous unit and is therefore particularly advantageously also suitable for retrofitting existing screw tensioning cylinders.
- the invention is explained below with reference to an embodiment shown in the drawing.
- the drawing shows:
- Fig. 2 shows a partial longitudinal section through the
- Fig. 3 is a partial view of the load change counter
- the load change counter has a solid, guaderiform housing 1, which is provided with a longitudinal bore 2, which serves as a cylinder bore.
- a transverse bore 3 serves as a pressure connection to a periodically pressurized actuating device, in particular to a hydraulic screw tensioning cylinder for tightening and loosening large screws, which is not shown in detail.
- a recess 4 is machined into the side of the housing 1 and has parallel end faces 5, 6 which are perpendicular to the axis of the longitudinal bore 2.
- the longitudinal bore 2 continues in a coaxial bore 7 which merges into an enlarged axial bore, which represents a recess 8 for a counter 18 inserted therein.
- the recess is provided with a side viewing window 9 for reading the counter 18.
- a first piston part 10 is guided in a sealed manner by means of a seal 11; in the rest position shown in FIG. 1, a collar 12 rests on the first piston part 10 on the end face 5.
- a second piston part 13, which is screwed to the first piston part 10, coaxially crosses the first piston part 10 through the Recess 4 and is guided through the bore 7.
- This second piston part 13 is encompassed by a compression spring 14 which is supported on the one hand on the collar 12 and on the other hand on the end face 6 of the recess 4. This compression spring 14 serves to guide the piston parts 10 and 13 into the position shown in FIG. 1 when the bore 2 is relieved of pressure.
- the piston part 13 is guided in the housing 1 against rotation.
- the piston part 13 has a longitudinal groove 15, in which a screw 16 engages radially.
- a V-groove 17 is arranged on the end face of the piston part 13.
- the counter 18 coaxially has a driver wedge 19 corresponding to the V-groove 17, which cooperates with the V-groove 17.
- the counter 18 is screwed to the housing 1 by means of a flange 20.
- a guide pin 21 on the driver wedge 19 engages in a bore in the piston part 13 and serves to guide the driver wedge 19.
- the driving wedge 19 is rotated relative to the V-groove 17 by about 36 ", preferably a little more than 36 °, due to the manufacturing tolerances, in order to ensure that the counter disk of the counter can be advanced by one counting unit.
- the bore 2 is pressurized via the transverse bore 3
- the piston part 1 moves with the piston part 13 into the position shown in Fig. 2.
- This causes the driving wedge 19 to be rotated by approximately 36 ° and thus to advance the
- the driver wedge 19 is turned back into the position shown in FIG. 1 by a spring in the counter 18, the one disk and the remaining disks of the counter remain in their position there the driver wedge 19 with the counter via a resilient Jack ratchet is coupled.
- the next counting process can thus be carried out again by pressurizing the bore 2.
- Fig. 3 it can be seen how the counter 18 can be read through the viewing window 9, which if applicable can have a glass protective pane.
- the piston part 10 with its seal 11 is first inserted into the bore 2. This hole is accessible via the recess 4 from the side. Then the compression spring 14 is also inserted into the recess 4 from the side.
- This compression spring can optionally be surrounded by a protective jacket and can be designed as a cylindrical coil spring or as a plate spring assembly or as a rubber block.
- the second piston part 13 is inserted from the front side of the housing 1 through the recess 8 into the bore 7 and screwed to the first piston part 10.
- the piston part 13 is secured against rotation by screwing in the screw 16 which engages in the groove 15.
- the counter 18 is likewise inserted into the recess 8 from the end face of the housing 1 and screwed to the housing 1 by means of a flange 20 arranged on the counter 18.
- the load change counter only needs to be connected via the transverse bore 3 to the pressurized actuating device, in particular a hydraulic screw tensioning cylinder, in order to be ready for operation.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Mechanical Engineering (AREA)
- Actuator (AREA)
- Fluid-Pressure Circuits (AREA)
- Measurement Of Force In General (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7504953A JPH09500991A (ja) | 1993-07-26 | 1994-07-23 | 荷重繰り返し計数器 |
EP94925384A EP0706695B1 (de) | 1993-07-26 | 1994-07-23 | Lastwechselzähler |
US08/591,574 US5682025A (en) | 1993-07-26 | 1994-07-23 | Load alternation loading device |
DE59400958T DE59400958D1 (de) | 1993-07-26 | 1994-07-23 | Lastwechselzähler |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4324888A DE4324888C3 (de) | 1993-07-26 | 1993-07-26 | Lastwechselzähler |
DEP4324888.8 | 1993-07-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1995003592A1 true WO1995003592A1 (de) | 1995-02-02 |
Family
ID=6493624
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1994/002444 WO1995003592A1 (de) | 1993-07-26 | 1994-07-23 | Lastwechselzähler |
Country Status (6)
Country | Link |
---|---|
US (1) | US5682025A (de) |
EP (1) | EP0706695B1 (de) |
JP (1) | JPH09500991A (de) |
AT (1) | ATE144849T1 (de) |
DE (2) | DE4324888C3 (de) |
WO (1) | WO1995003592A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE202009018684U1 (de) | 2008-11-25 | 2012-07-30 | Jörg Hohmann | Hydraulische Schraubenspannvorrichtung |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4324888C3 (de) * | 1993-07-26 | 2000-07-27 | Frank Hohmann | Lastwechselzähler |
DE19638901C2 (de) * | 1996-09-23 | 2000-05-25 | Joerg Hohmann | Hydraulische Gewindebolzenspannvorrichtung |
DE10216416B4 (de) * | 2002-04-12 | 2004-02-26 | Condor Werke Gebr. Frede Gmbh & Co Kg | Druckschalter |
DE20311811U1 (de) * | 2003-07-31 | 2003-09-25 | Hazet Werk Zerver Hermann | Drehmomentschlüssel |
DE102009043907A1 (de) | 2009-08-31 | 2011-03-03 | Frank Hohmann | Hydraulische Gewindebolzenspannvorrichtung und Verfahren zum großen Schrauben mittels der hydraulischen Gewindebolzenspannvorrichtung |
EP2953767B1 (de) * | 2013-02-05 | 2020-01-15 | Wärtsilä Finland Oy | Vorspannwerkzeug, vorspannsystem und verfahren zum vorspannen von bolzen |
CN103878579A (zh) * | 2014-03-28 | 2014-06-25 | 李圣用 | 一种液压式拧紧机的计数机构 |
CN108916157B (zh) * | 2018-08-03 | 2020-04-03 | 马鞍山市金工机械有限公司 | 一种具有易拆卸、可调缓冲的压料油缸 |
KR102270186B1 (ko) * | 2019-07-29 | 2021-06-28 | 주식회사 케이티앤지 | 에어로졸 생성 장치 |
CN111922691B (zh) * | 2020-08-14 | 2022-03-29 | 马鞍山市罗泰特机械制造有限公司 | 一种可计次的液压螺栓拉伸器 |
CN111922690B (zh) * | 2020-08-14 | 2022-03-29 | 马鞍山市罗泰特机械制造有限公司 | 一种具有计次功能的弹簧自复位双级液压拉伸器 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3186311A (en) * | 1962-10-03 | 1965-06-01 | Carl M Carlson | Air impulse counter |
US3843047A (en) * | 1972-02-16 | 1974-10-22 | Daini Seikosha Tokyo Kk | Writing instrument with counter |
DE3512568A1 (de) * | 1985-04-06 | 1986-10-16 | Festo KG, 7300 Esslingen | Hubzaehler fuer hin- und herbewegte teile |
EP0224467A2 (de) * | 1985-11-26 | 1987-06-03 | Hoerbiger Ventilwerke Aktiengesellschaft | Druckimpulsbetätigter mechanischer Zähler |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US384307A (en) * | 1888-06-12 | Corset | ||
DE306161C (de) * | ||||
US3703629A (en) * | 1970-06-01 | 1972-11-21 | Madatron Corp | Pneumatically operated counting device |
GB1408211A (en) * | 1972-02-16 | 1975-10-01 | Seiko Instr & Electronics | Writing utensil |
JPS5716387B2 (de) * | 1975-01-29 | 1982-04-05 | ||
US4322966A (en) * | 1981-05-26 | 1982-04-06 | The United States Of America As Represented By The Secretary Of The Army | Weapon cycle or shot counter |
US4993259A (en) * | 1989-04-03 | 1991-02-19 | Automotive Products Plc | Method and apparatus for testing prefilled hydraulic systems |
DE4200035A1 (de) * | 1992-01-02 | 1993-07-08 | Unicraft Oy | Dichtungsanordnung |
DE4324888C3 (de) * | 1993-07-26 | 2000-07-27 | Frank Hohmann | Lastwechselzähler |
DE4341707C3 (de) * | 1993-11-12 | 1999-02-11 | Frank Hohmann | Hydraulische Gewindebolzenspannvorrichtung |
-
1993
- 1993-07-26 DE DE4324888A patent/DE4324888C3/de not_active Expired - Lifetime
-
1994
- 1994-07-23 AT AT94925384T patent/ATE144849T1/de not_active IP Right Cessation
- 1994-07-23 WO PCT/EP1994/002444 patent/WO1995003592A1/de not_active Application Discontinuation
- 1994-07-23 DE DE59400958T patent/DE59400958D1/de not_active Revoked
- 1994-07-23 JP JP7504953A patent/JPH09500991A/ja active Pending
- 1994-07-23 US US08/591,574 patent/US5682025A/en not_active Expired - Lifetime
- 1994-07-23 EP EP94925384A patent/EP0706695B1/de not_active Revoked
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3186311A (en) * | 1962-10-03 | 1965-06-01 | Carl M Carlson | Air impulse counter |
US3843047A (en) * | 1972-02-16 | 1974-10-22 | Daini Seikosha Tokyo Kk | Writing instrument with counter |
DE3512568A1 (de) * | 1985-04-06 | 1986-10-16 | Festo KG, 7300 Esslingen | Hubzaehler fuer hin- und herbewegte teile |
EP0224467A2 (de) * | 1985-11-26 | 1987-06-03 | Hoerbiger Ventilwerke Aktiengesellschaft | Druckimpulsbetätigter mechanischer Zähler |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE202009018684U1 (de) | 2008-11-25 | 2012-07-30 | Jörg Hohmann | Hydraulische Schraubenspannvorrichtung |
Also Published As
Publication number | Publication date |
---|---|
DE4324888A1 (de) | 1995-02-02 |
DE59400958D1 (de) | 1996-12-05 |
US5682025A (en) | 1997-10-28 |
EP0706695A1 (de) | 1996-04-17 |
DE4324888C3 (de) | 2000-07-27 |
ATE144849T1 (de) | 1996-11-15 |
EP0706695B1 (de) | 1996-10-30 |
JPH09500991A (ja) | 1997-01-28 |
DE4324888C2 (de) | 1995-05-18 |
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