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 PDF

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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Withdrawn
Application number
EP85116175A
Other languages
German (de)
French (fr)
Other versions
EP0186860A3 (en
Inventor
Czeslaw Ochwat
Boguslaw Duchowicz
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.)
OSRODEK BADAWCZO-ROZWOJOWY URZADZEN MECHANICZNYCH
Original Assignee
"Osrodek Badawczo-Rozwojowy Urzadzen Mechanicznych"
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 "Osrodek Badawczo-Rozwojowy Urzadzen Mechanicznych" filed Critical "Osrodek Badawczo-Rozwojowy Urzadzen Mechanicznych"
Publication of EP0186860A2 publication Critical patent/EP0186860A2/en
Publication of EP0186860A3 publication Critical patent/EP0186860A3/en
Withdrawn legal-status Critical Current

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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.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)

Abstract

The invention solves the problem of a simple unit for determination of overturning moment of a heavy working machine, especially a crane, by utilization of elastic strain of separable connections.
The unit has an indicator (1) connected with a measuring instrument serving for determination of a total force R. The indicator (1) 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 from the axis of rotation of the crane, that is, in the vicinity of rolling elements of the bearing (2).

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 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.
  • 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 the body arm 5 in relation to the inner track of the bearing 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)

1. A unit for measurement of overturningmoment of a heavy working machine, especially a crane, comprising an indicator connected with a measuring instrument serving for determination of the total force R, said force R being the sum of the loading force, the force of the jib weight, the wind force, and other forces, characterized in that the indicator /1/ 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 a 2 from the axis of rotation of the crane, that is, in the vicinity of rolling elements of the bearing /2/.
2. A unit according to claim 1, characterized in that the force R is determined on the basis of the dimension Δ resulting from elastic strain of fasteners /3/ connecting the crane body /5/ with the bearing /6/.
3. A unit according to claim 1, characterized in that the reaction force P is detamined by means of a touchless indicator /1/.
EP85116175A 1984-12-19 1985-12-18 A unit for measurement of overturning moment of a heavy working machine, especially a crane Withdrawn EP0186860A3 (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Patent Citations (4)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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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