EP0186860A2 - A unit for measurement of overturning moment of a heavy working machine, especially a crane - Google Patents
A unit for measurement of overturning moment of a heavy working machine, especially a crane Download PDFInfo
- Publication number
- EP0186860A2 EP0186860A2 EP85116175A EP85116175A EP0186860A2 EP 0186860 A2 EP0186860 A2 EP 0186860A2 EP 85116175 A EP85116175 A EP 85116175A EP 85116175 A EP85116175 A EP 85116175A EP 0186860 A2 EP0186860 A2 EP 0186860A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- crane
- force
- indicator
- unit
- measurement
- 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.)
- Withdrawn
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/88—Safety gear
- B66C23/90—Devices for indicating or limiting lifting moment
Definitions
- the subject of the present invention is a unit for measurement of overturning moment of a heavy working machine, especially a crane, mounted on a crane.
- Known units for measurement of overturning moment are provided with several indicators installed on a crane, which measure forces of the rope, oil pressure in the cylinder, the inclination angle of the jib, the length of the jib arm, etc.
- the obtained parameters are fed into the system of the lifting capacity limiter in which they are converted into overturning moment.
- the known units have such a disadvantage that they determine overturning moment by means of many indicators placed in several places of the crane and by means of other additional devices.
- the production cost of said units is high, whereas measurements obtained by them have little accuracy.
- the essence of the solution is a unit which has a measurement indicator, preferably touchless, which is situated perpendicularly to the rotation plane of the crane and lies in the vertical plane of symmetry of the jib and is set at a constant distance of about IL from the axis of rotation of the crane, that is, in the vicinity of rolling elements of the bearing.
- the force R may be determined on the basis of the ouantity of the dimension originated from elastic strain of fasteners connecting the crane body with the bearing.
- An advantage of the unit according to the invention is, first of all, the fact that it is simple in design, whereas in operation it determines measurements of overturning moment with high accuracy.
- figs 1 and 2 present the side view of the place of location of indicators in a crane with hydraulic and mechanical drive
- fig.4 presents the axial section of a detail of location of an indicator.
- the unit has a touchless indicator 1 which is connected with a measuring instrument converting impulses produced in the result of a change of a measuring port ⁇ , the size of which depends on elastic strain of screws 3 fixing the body arm 5 to the inner track of a bearing 6.
- Said indicator is situated perpendicularly to the rotation plane of the crane and lies in the vertical plane of symmetry of the jib and is set at a constant distance smaller from a 2 from the axis of rotation of the crane, that is, in the vicinity of rolling elements of the bearing 2.
- the bearing is designed so that it has the outer track composed of an upper ring 7 and a lower ring 8 which are connected together and attached by means of screws 4 to the crane undercarriage 2.
- the measurement of overturning moment consists in a measurement of the reaction force R whose value is equal to the sum of the loading force, the force of the jib weight, the wind force, and other forces where said force R is directed upwards and is perpendicular to the plane of rotation and lies in the vertical plane of symmetry of the jib and is measured at the distance smaller from a 2 from the axis of rotation of the crane, that is, in the vicinity of rolling elements of the bearing.
- the reaction force is established from elastic strain of screws 3 connecting the body arm with the crane base.
- the measurement is made on the basis of a change of the distance ⁇ of the position of the indicator 1 fixed to the body arm 5 in relation to the inner track of the bearing 6, being the crane base.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Jib Cranes (AREA)
Abstract
Description
- The subject of the present invention is a unit for measurement of overturning moment of a heavy working machine, especially a crane, mounted on a crane.
- Known units for measurement of overturning moment are provided with several indicators installed on a crane, which measure forces of the rope, oil pressure in the cylinder, the inclination angle of the jib, the length of the jib arm, etc. The obtained parameters are fed into the system of the lifting capacity limiter in which they are converted into overturning moment.
- Those skilled in the art know from the G.F.R. patent specification no. 155339 a device for limiting the load torque of a crane or other crane units, which is characterized by that the load toroue is measured by means of an elasticity meter or other instrument situated in the screw fixing the bearing outer ring. The instrument measures the force in the place of the measurement plane transferring the moments of structural elements through lifting and lowering impulses of the jib, which cause switching off of the alarm device. The instrument signals also parameters of an unloaded crane, and at exceeding the permissible weight it switches off the lifting mechanism.
- The known units have such a disadvantage that they determine overturning moment by means of many indicators placed in several places of the crane and by means of other additional devices. The production cost of said units is high, whereas measurements obtained by them have little accuracy.
- The essence of the solution is a unit which has a measurement indicator, preferably touchless, which is situated perpendicularly to the rotation plane of the crane and lies in the vertical plane of symmetry of the jib and is set at a constant distance of about IL from the axis of rotation of the crane, that is, in the vicinity of rolling elements of the bearing. In the unit the force R may be determined on the basis of the ouantity of the dimension originated from elastic strain of fasteners connecting the crane body with the bearing.
- An advantage of the unit according to the invention is, first of all, the fact that it is simple in design, whereas in operation it determines measurements of overturning moment with high accuracy.
- The solution is presented in more detail in an example of its embodiment in the attached drawing, in which figs 1 and 2 present the side view of the place of location of indicators in a crane with hydraulic and mechanical drive, fig.3 - the top view of the place of location of an indicator in a crane, and fig.4 presents the axial section of a detail of location of an indicator.
- The unit has a
touchless indicator 1 which is connected with a measuring instrument converting impulses produced in the result of a change of a measuring port Δ, the size of which depends on elastic strain of screws 3 fixing thebody arm 5 to the inner track of abearing 6. Said indicator is situated perpendicularly to the rotation plane of the crane and lies in the vertical plane of symmetry of the jib and is set at a constant distance smaller from a 2 from the axis of rotation of the crane, that is, in the vicinity of rolling elements of the bearing 2. The bearing is designed so that it has the outer track composed of anupper ring 7 and alower ring 8 which are connected together and attached by means of screws 4 to the crane undercarriage 2. - In the solution according to the invention the measurement of overturning moment consists in a measurement of the reaction force R whose value is equal to the sum of the loading force, the force of the jib weight, the wind force, and other forces where said force R is directed upwards and is perpendicular to the plane of rotation and lies in the vertical plane of symmetry of the jib and is measured at the distance smaller from a 2 from the axis of rotation of the crane, that is, in the vicinity of rolling elements of the bearing. The reaction force is established from elastic strain of screws 3 connecting the body arm with the crane base. The measurement is made on the basis of a change of the distance Δ of the position of the
indicator 1 fixed to thebody arm 5 in relation to the inner track of thebearing 6, being the crane base. Reduced overturning moment P · L has a constant value, thus, also the total force R = P·L a has a constant value as well. - For the measurement of reaction a touchless room indicator built in point A has been applied.
Claims (3)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL25109684A PL251096A1 (en) | 1984-12-19 | 1984-12-19 | Method of measuring an overturning moment of a heavy-duty working machine in particular of a crane |
PL251096 | 1984-12-19 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0186860A2 true EP0186860A2 (en) | 1986-07-09 |
EP0186860A3 EP0186860A3 (en) | 1988-10-26 |
Family
ID=20024657
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP85116175A Withdrawn EP0186860A3 (en) | 1984-12-19 | 1985-12-18 | A unit for measurement of overturning moment of a heavy working machine, especially a crane |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0186860A3 (en) |
PL (1) | PL251096A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2640950A1 (en) * | 1988-12-28 | 1990-06-29 | Takraf Schwermasch | |
US7014054B2 (en) * | 2002-07-01 | 2006-03-21 | Jlg Industries, Inc. | Overturning moment measurement system |
DE102010012888A1 (en) * | 2010-03-26 | 2011-09-29 | Liebherr-Werk Ehingen Gmbh | Construction machinery |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1086700A (en) * | 1953-11-09 | 1955-02-15 | Auxiliaire De L Entpr Auxen So | Safety device limiting the loads to be lifted by a crane |
DE1804094U (en) * | 1959-10-24 | 1960-01-14 | Demag Zug Gmbh | OVERLOAD PROTECTION FOR MOBILE CRANES. |
DE1556339A1 (en) * | 1968-01-20 | 1970-02-26 | Benirschke Dipl Ing Alfred | Overload protection for cranes, hoists or the like. |
US4336720A (en) * | 1980-08-22 | 1982-06-29 | Lull Engineering Company, Inc. | Load sensing system |
-
1984
- 1984-12-19 PL PL25109684A patent/PL251096A1/en unknown
-
1985
- 1985-12-18 EP EP85116175A patent/EP0186860A3/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1086700A (en) * | 1953-11-09 | 1955-02-15 | Auxiliaire De L Entpr Auxen So | Safety device limiting the loads to be lifted by a crane |
DE1804094U (en) * | 1959-10-24 | 1960-01-14 | Demag Zug Gmbh | OVERLOAD PROTECTION FOR MOBILE CRANES. |
DE1556339A1 (en) * | 1968-01-20 | 1970-02-26 | Benirschke Dipl Ing Alfred | Overload protection for cranes, hoists or the like. |
US4336720A (en) * | 1980-08-22 | 1982-06-29 | Lull Engineering Company, Inc. | Load sensing system |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2640950A1 (en) * | 1988-12-28 | 1990-06-29 | Takraf Schwermasch | |
US7014054B2 (en) * | 2002-07-01 | 2006-03-21 | Jlg Industries, Inc. | Overturning moment measurement system |
DE102010012888A1 (en) * | 2010-03-26 | 2011-09-29 | Liebherr-Werk Ehingen Gmbh | Construction machinery |
US8943874B2 (en) | 2010-03-26 | 2015-02-03 | Liebherr-Werk Ehingen Gmbh | Construction machine |
DE102010012888B4 (en) * | 2010-03-26 | 2018-02-08 | Liebherr-Werk Ehingen Gmbh | Construction machinery |
Also Published As
Publication number | Publication date |
---|---|
PL251096A1 (en) | 1986-07-15 |
EP0186860A3 (en) | 1988-10-26 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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AK | Designated contracting states |
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17P | Request for examination filed |
Effective date: 19860903 |
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RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: OSRODEK BADAWCZO-ROZWOJOWY URZADZEN MECHANICZNYCH |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
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AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): DE FR GB |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19890427 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: OCHWAT, CZESLAW Inventor name: DUCHOWICZ, BOGUSLAW |