EP2184251A1 - Teleskopischer Ausleger - Google Patents

Teleskopischer Ausleger Download PDF

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Publication number
EP2184251A1
EP2184251A1 EP09175135A EP09175135A EP2184251A1 EP 2184251 A1 EP2184251 A1 EP 2184251A1 EP 09175135 A EP09175135 A EP 09175135A EP 09175135 A EP09175135 A EP 09175135A EP 2184251 A1 EP2184251 A1 EP 2184251A1
Authority
EP
European Patent Office
Prior art keywords
boom
pad
upper slide
arc
grease
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.)
Granted
Application number
EP09175135A
Other languages
English (en)
French (fr)
Other versions
EP2184251B1 (de
Inventor
Yoji Hanawa
Hiroki Nakayama
Isao Motoyama
Syunsuke Yokoyama
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.)
Kobelco Cranes Co Ltd
Original Assignee
Kobelco Cranes Co Ltd
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 Kobelco Cranes Co Ltd filed Critical Kobelco Cranes Co Ltd
Publication of EP2184251A1 publication Critical patent/EP2184251A1/de
Application granted granted Critical
Publication of EP2184251B1 publication Critical patent/EP2184251B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B66C23/62—Constructional features or details
    • B66C23/64—Jibs
    • B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths
    • B66C23/701—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
    • B66C23/707—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic guiding devices for telescopic jibs

Definitions

  • the present invention relates to an inserted type of telescopic boom. Especially, this invention relates to an improvement made on a slide pad which is used at a rear end of the telescopic boom.
  • a base boom and at least one inserted boom are provided as a telescopic boom.
  • the base boom is mounted on an upper revolving body so as to be freely raised or lowered, and the upper revolving body is rotatably mounted on a lower traveling body.
  • the inserted booms are telescopically inserted into the base boom.
  • the base boom and the inserted booms have lower slide pads and upper slide pads respectively.
  • Each lower slide pad is installed on a lower area of an inner plate at a top portion of an outer boom, and it supports an inner boom so that a bottom face of the inner boom can be slid on the lower slide pad.
  • each upper slide pad is installed on an upper area of an outer plate at a rear end portion of the inner boom, and it slides on an upper area of the inner plate of the outer boom. Relating to the slide pad of the telescopic boom like this, the after-mentioned conventional examples 1 and 2 are commonly known.
  • the conventional example 1 is described in EP0849212A1 .
  • the telescopic boom relating to this conventional example 1 is explained referring to Fig. 6 .
  • arc-shaped portions are provided at upper corners of an outer boom 21 and slanted surfaces are provided at lower corners respectively.
  • other slanted surfaces are provided at lower corners of an inner boom 22.
  • Lower slide pads 23' and 23' are located between these slanted surfaces of the inner boom 22 and the outer boom 21.
  • slanted guide surfaces 24 and 24 are provided at upper corners at the rear end of the inner boom 22. Between the arc-shaped upper corners of the outer boom 21 and the guide surfaces 24, upper slide pads 23 and 23 are located.
  • a cylinder 25 extends and retracts the inner boom 22.
  • the conventional example 2 is described in EP07025661A1 .
  • the telescopic boom relating to the conventional example 2 is explained referring to Fig. 7A through Fig. 7C .
  • the telescopic boom relating to the conventional example 2 has an outer boom 41 and an inner boom 42. Between arc-shaped corner portions Ra located at top and rear end areas of the inner boom 42 and arc-shaped corner portions Ri located at top and rear end areas of the outer boom 41, half liners 45 are provided. The half liners 45 are installed between rear end collars 43 and stop collars 44 which are slightly deviated from the rear end collars 43 toward the front end. These half liners 45 correspond to the upper slide pads of the invention. The peripheral surfaces of the half liners 45 are slidably contacted only to the arc-shaped corners Ri, without contacting both the flat inner surface of the top plate and the flat inner surface of the lateral side plate of the outer boom 41. Numerals 46 denote the slide pads which are installed in a front end area of the outer boom 41, and the slide pads 46 support the inner boom 42 so as to slide on the slide pads.
  • the slide pads of the telescopic boom as described above need to be lubricated with grease in order to reduce sliding resistance and wearing.
  • the conventional methods 3 and 4 described below are commonly known.
  • Fig. 8A shows a longitudinal cross section at a base end of a four-steps telescopic boom
  • Fig. 8B shows a cross section at the line E-E of Fig. 8A .
  • An outermost boom 53 is the base boom. Inside this base boom 53, a second boom 54 is inserted. Inside the second boom 54, a third boom 55 is inserted. Inside the third boom 55, a top boom 56 is inserted.
  • upper slide pads 57, 58 and 59 are provided respectively.
  • Grease nipples 60, 61 and 62 are located over the upper slide pads 57, 58 and 59, and they are installed on a top plate of the base boom 53.
  • the topside of the base boom 53 becomes the upper side of the base boom after it is assembled as a crane.
  • Grease is supplied to the upper slide pad 57 installed on the top plate of the second boom 54 from the lubricating nipple 60.
  • the grease which is supplied from the lubricating nipple 61 is sent to the upper slide pad 58 through a grease pocket 66 which is formed between the base boom 53 and the second boom 54, and a grease supply port 63 is prepared on the top plate of the second boom 54.
  • the grease which is supplied from the lubricating nipple 62 is sent to the upper slide pad 59 through a grease pocket 68 formed between the base boom 53 and the second boom 54, a grease supply port 65 prepared on the top plate of the second boom 54, a grease pocket 67 formed between the second boom 54 and the third boom 55, and a grease supply port 64 prepared on the top plate of the third boom 55.
  • Fig. 9 is a longitudinal section view of a boom showing a layout of a grease supply line when an inner cylinder is in a fully retracted position.
  • An inner boom 73 is inserted into an outer boom 72 so as to allow its telescopic motion.
  • a grease supply line 76 is extended from a grease nipple 75 installed on a boom head 71a of the boom 71.
  • the upper slide pad 74 is lubricated with the grease supplied to the upper slide plate 74 through the supply line 76 from the grease nipple 75.
  • all slide surfaces (surface R) of the upper slide pads installed on the inner boom can slide only on the slide surfaces R located at each right and left corner of the top plate of the outer boom in the lateral direction.
  • the upper slide pad slides only on the surface R, in order to decrease the pressure at the upper slide pad, it is necessary to widen the upper slide pad along the longitudinal direction of the boom or to enlarge the radius of curvature of the surface R of the upper slide pad and the surface R located at each corner of the top plate of the outer boom.
  • the upper slide pad In case of widening the upper slide pad, a housing to accommodate the upper slide pad is provided in the inner boom. Accordingly, the upper slide pad must be widened by a certain amount along the longitudinal direction of the boom, so a problem occurs that the length of overhanging at the base end of the inner boom is necessarily extended by the amount, and consequently the overall length of the telescopic boom in its fully shortened (fully retracted) position is also enlarged. Moreover, in case of enlarging the radius of the curvature of the surface R, the sectional strength performance (modulus of section) of the telescopic boom is decreased. Therefore, in order to secure the prescribed crane performance, it is necessary to size up the dimension of the telescopic boom which causes another problem of preventing the boom weight from reducing.
  • a telescopic boom of the present invention has an outer boom and at least one inner boom inserted therein.
  • Arc-shaped portions are formed at each right and left corner of a top plate of the inner boom, and a flat top plate and a flat lateral plate are connected integrally with the arc-shaped surface.
  • pad mountings Facing each right and left corner of the top plate of the outer boom, pad mountings are provided on a base end of a top plate of the inner boom.
  • Upper slide pads are installed on the pad mountings.
  • a slide surface of the upper slide pad is formed so that a contact length with an inner surface of the flat top plate of the outer boom and an inner surface of the arc-shaped portion is longer than a contact length with an inner surface of the flat lateral plate of the outer boom and the inner surface of the arc-shaped portion.
  • the width of the upper slide pad in a boom width direction can be wider and the length of the upper slide pad in the boom longitudinal direction can be shorter. Accordingly, a protrusion length at the base end of the inner boom can be shortened, and an overall length of the telescopic boom in its utmost retracted position is also shortened.
  • the present invention can extend the overall length of the telescopic boom in its utmost extended position by the same amount of the shortened protrusion length at the base end of the inner boom. Moreover, since a length of the upper slide pad in the boom width direction is enlarged, the pressure thereon can be decreased. Therefore, as it is not necessary to increase the radius of curvature of the arc-shaped portions of each outer boom and inner boom, the telescopic boom can be slenderized, and the weight of the telescopic boom can be decreased.
  • the telescopic boom of the present invention it is possible to form a slanted pad fitting surface connected with the flat top plate and the flat lateral plate by cutting out the arc-shaped portion.
  • an angle between the flat pad fitting surface and the flat top plate of the inner boom can be smaller than 40 degrees.
  • an element of load onto the upper slide pad in the boom width direction that is a force to dislocate the pad along the lateral direction, can be decreased; therefore it is not necessary to enforce a fastening means for fixing the upper slide pad on the pad mounting.
  • the grease supply ports are furnished on the flat top plates or the flat lateral plates of the outer booms.
  • the grease guide path is furnished on the upper slide pad so that it may guide the grease into the inner surface of the arc-shaped portion of the outer boom.
  • the crack problem relating to the technology of the conventional example 3 does not occur.
  • the long grease supply lines as mentioned in the technology relating to the conventional example 4 are not necessary, so the grease lubrication can be achieved without a high pressure grease pump and it possible to simplify the grease supply system.
  • a mobile crane 11 (wheel crane) is furnished with a telescopic boom Bm relating to the first embodiment mentioned after.
  • This mobile crane 11 is furnished with a traveling frame 12.
  • front wheels 12a are provided at the right side in its forwarding direction and rear wheels 12b are provided at the left side in its forwarding direction as shown in Fig.1 .
  • an upper revolving body 13 is installed free to rotate around a vertical axis by a slewing ring 12c.
  • an operator cab 14 is located on a front area of the upper revolving body 13.
  • the telescopic boom Bm is located so as to raise and lower by means of boom raising/lowering cylinders 15.
  • a winch which is not shown herein is stored. By this winch, a rope 16 is wounded or unwounded. A hook 17 for hoisting a lifting material is attached to the end of the rope 16, and is hanged down from a top of the telescopic boom Bm.
  • Numeral 13a denotes a counterweight.
  • the telescopic boom Bm relating to the first embodiment of the present invention shows a four-steps telescopic boom.
  • a base boom 1 is mounted on the upper revolving body 13 so as to be swingably raised up and lowered down.
  • a second boom 2 is inserted free to extend and retract in the base boom 1
  • a third boom 3 is inserted free to extend and retract in the second boom 2
  • a top boom 4 is inserted in the third boom 3.
  • This telescopic boom Bm as mentioned above is the four-steps type.
  • the telescopic boom of the present invention is also applicable to less than three-steps type or more than five-steps type, and is not limited only to the four-steps type of telescopic boom.
  • the base boom 1 is an outermost boom.
  • the second boom 2 is an inner boom of the base boom 1 as well as an outer boom of the third boom 3.
  • the third boom 3 is an outer boom of the top boom 4, and the top boom 4 is an inner boom of the third boom 3.
  • an object shown in the broken lines in the lower inside area of the front end of the base boom 1 is a first front lower pad 11p which supports the second boom 2 free to slide while its telescopic motion.
  • an object shown in the broken lines in the lower inside area of the front end of the second boom 2 is a second front lower pad 21p which supports the third boom 3 to slide while its telescopic motion.
  • an object shown in the broken lines in the lower inside area of the front end of the third boom 3 is a third front lower pad 31p which supports the above top boom 4 free to slide while its telescopic motion.
  • the upper slide pads allocated to the top plates of the base ends of the second, third and top boom 2,3,4 and the pad mountings provided on the booms are almost same respectively. Referring the top boom 4 as an example, an explanation about them is made hereafter.
  • FIG. 3A and Fig, 3B are the sectional view cut along the vertical direction against the longitudinal direction of the boom.
  • a half-square shaped box 41 is formed as mentioned after. At the right and left corners of the half-square shaped box 41 in the boom width direction, the arc-shaped portions with a predetermined radius of curvature are formed. Further, the half-square shaped box 41 is opened downwardly. On the other hand, at the bottom plate of the lower half of the top boom 4, an arch portion 42 whose outside width from the right to the left is smaller than the circumferential length of the opening is formed as be smaller than the semicircle of the arch. End portions of side plates 41b of the half-square shaped box 41 and end portions of the arch 42 are connected together with slanted flat side plates 43.
  • pad mountings 44 are provided as mentioned after.
  • the upper slide pad 5 is attached as mentioned after.
  • the slide pads 5 and the pad mountings 44 on each right and left are symmetrical and are the same structures.
  • the pad mounting 44 is composed as shown in Fig. 4 .
  • the pad mounting 44 is made by cutting out the arc-shaped portion 41a formed on the top plate at the base end of the top boom 4, and has a flat pad fitting surface 44a which connects a flat top plate 41c integrally with the flat side plate 41b at the base end of the top boom 4. Furthermore, the portion where this pad mounting 44 faces the top boom 4 in the longitudinal direction is covered by a block plate 44b that has the same radius curvature as the arc-shaped portion 41a.
  • an angle ⁇ between the above pad fitting surface 44a and the flat top plate 41c at the base end of the top boom 4 is set smaller than 40 degrees.
  • the upper slide pad 5, as shown in Fig. 3B is engaged with the pad mounting 44 so as to set the bottom surface of the upper slide pad 5 on the pad fitting surface 44a.
  • the upper slide pad 5 is fixed on the top boom 4 with mechanical fixing means such as bolts, for example.
  • a slide surface 5a of the upper slide pad 5 does not contact the inner surface of a flat top plate 35 of the third boom 3 in Fig. 3B .
  • the slide surface 5a of the upper slide pad 5 is formed so that the slide pad 5 may slidably contact a part of the above inner surface 35 and the inner surface of the arc-shaped portion 31a'.
  • the angle ⁇ between the pad fitting surface 44a and the flat top plate 41c at the base end of the top boom 4 is set to be smaller than 40 degrees, in the cross section, the contact length with a part of the inner surface of the flat top plate 35 of the third boom 3 and the inner surface 31a' of the arc-shaped portion is longer than the contact length with a part of the inner surface 41b' of the flat side plate and the inner surface 31a' of the arc-shaped portion.
  • a grease guide path 5b is provided so that a grease outlet port 5c opened at the flat side of the slide surface 5a of the upper slide pad 5 is connected to the inside of the arc-shaped portion 31a of the third boom 3.
  • the grease is supplied from the grease supply port 6 provided on the top plate 11c of the base boom 1 into the grease outlet port 5c. Concentric holes in line with the grease supply port 6 are drilled on all top plates of the second boom 2, the third boom 3 and the top boom 4.
  • the slide surface 5a of the upper slide pad 5 is formed so that the slide surface 5a may slidably contact a part of the flat inner surface 35 of the third boom 3 and the inner surface of the arc-shaped portion 31a'.
  • the contact length with a part of the inner surface of the flat top plate 35 of the third boom 3 and the inner surface 31a' of the arc-shaped portion is longer than the contact length with a part of the inner surface 41b' of the flat side plate and the inner surface 31a' of the arc-shaped portion.
  • the dimension of the upper slide pad 5 in the boom width direction can be larger, the dimension of the boom in the longitudinal direction can be smaller than that of the conventional examples 1 and 2. Because of this reason, the length L of the overhanging at the base end of the boom can be shortened and the overall length of the telescopic boom Bm in its utmost retracted position can be shortened. In other word, since the inner telescopic boom can be made longer than that of the conventional examples by the shortened amount, the overall length of the telescopic boom in its utmost extended position can be longer. In addition, since the dimension of the upper slide pad in the boom width direction can be larger, the pressure added to the pad can be decreased.
  • the first embodiment can contribute greatly to the weight reduction of the telescopic boom.
  • the pad fitting surface 44a of the pad mounting 44 is flat, the thickness of the upper slide pad 5 can be increased, and therefore the upper slide pad 5 can be reinforced.
  • the angle between the pad fitting surface 44a of the pad mounting 44 and the flat top plate at the base end of the top boom 4 is set to be smaller than 40 degrees. Therefore, the element of the load in the boom width direction, which is added to the upper slide pad 5, that is the force to dislocate the pad along the lateral direction, can be reduced. Therefore, the strength of mechanical fastening means which fixes the upper slide pad 5 onto the pad mounting 44 can be relatively lowered.
  • the grease supplied from the grease supply port 6 provide on the flat top plate 11c of the base boom 1 is guided into the arc-shaped portion of the third boom 3 through the grease guide path 5b located on the upper slide pad 5. Because the arc-shaped portions on the boom do not have any grease holes, any such problems as the crack occurrence on the boom do not occur at all.
  • grease supply pipe as used in the conventional example 4 is not used, grease lubrication is fulfilled without any assistance of a high pressure grease pump, and therefore the grease supply system is simplified.
  • a telescopic boom relating to the second embodiment of the present invention is explained hereinafter. Since the difference between the second embodiment and the first embodiment exists only in the points of the location of the grease holes and the configuration of the grease guide path. As other parts except for these points are identical to those of the above mentioned first embodiment, these differences are explained mainly hereinafter.
  • a grease inlet port 7c has a path opened toward the lateral side of the third boom 3 from the slide surface 7a of an upper slide pad 7. Further, the grease guide path 7b is connected continuously to the inner surface of the arc-shaped portion of the top boom 4. As shown in Fig. 5B , when the above telescopic boom Bm is in the utmost retracted position, the grease is supplied from a grease supply port 8 provided at a lateral side plate 11b of the base boom 1 into the grease inlet port 7c. Moreover, concentric holes in line with the grease supply port 8 are drilled on all lateral plates of the second boom 2, third boom 3 and the top boom 4.
  • the grease supplied from the grease supply port 8 provided on the lateral slide plate 11b of the base boom 1 is guided into an inner surface 31a' of the arc-shaped portion of the third boom 3 through the grease guide path 7b provided in the upper slide pad 7.
  • This structure is only the difference from the telescopic boom Bm relating to the above first embodiment, and other structures are the same as those of the telescopic boom Bm relating to the first embodiment.
  • the explanation is directed to the upper slide pads provided on the top booms as an example.
  • the same structure is applicable to the upper slide pads of any other inserted booms except for the base boom.
  • the above mentioned embodiments are used for a wheel crane as an example, it should be noted that the present invention is not limited to the embodiments described above. The present invention can be applicable, for example, to other type of crane having a telescopic boom, and to a telescopic boom for a work platform vehicle and so forth.
  • An upper slide pad 5 is provided on a base end of a flat top plate 41c of an inner boom 4 inserted into an outer boom 3 of a telescopic boom Bm.
  • a slide surface 5a of the upper slide pad 5 is formed so that a contact length with an inner surface 35 of a flat top plate of the outer boom 3 and an inner surface 31a' of a arc-shaped portion is longer than a contact length with an inner surface of a flat lateral side plate of the outer boom 3 and the inner surface 31a' of the arc-shaped portion. Accordingly, the present invention can procure a lighter and stronger telescopic boom whose overall length can be longer in its utmost extended position. Moreover, the present invention can also shorten the overall length of the telescopic boom in its utmost retracted position, and can increase strength of the arc-shaped portion of the telescopic boom.
EP20090175135 2008-11-07 2009-11-05 Teleskopischer Ausleger Not-in-force EP2184251B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2008286491 2008-11-07
JP2009184339A JP4816776B2 (ja) 2008-11-07 2009-08-07 伸縮ブーム

Publications (2)

Publication Number Publication Date
EP2184251A1 true EP2184251A1 (de) 2010-05-12
EP2184251B1 EP2184251B1 (de) 2012-05-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP20090175135 Not-in-force EP2184251B1 (de) 2008-11-07 2009-11-05 Teleskopischer Ausleger

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EP (1) EP2184251B1 (de)
JP (1) JP4816776B2 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102398864A (zh) * 2011-07-12 2012-04-04 长沙中联重工科技发展股份有限公司 伸缩机构、工程机械及消防机械
CN111677756A (zh) * 2020-06-19 2020-09-18 三一汽车起重机械有限公司 导向滑动组件、伸缩臂架及工程机械

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109573866A (zh) * 2017-09-29 2019-04-05 中国铁路总公司 一种铁路起重机

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3101017A1 (de) * 1981-01-15 1982-08-05 Fried. Krupp Gmbh, 4300 Essen "kunststoffgleitlagerung"
JPH06217693A (ja) 1993-01-26 1994-08-09 Riken Vitamin Co Ltd 製パン用油脂組成物
EP0702661A1 (de) 1993-06-16 1996-03-27 EC Engineering + Consulting Spezialmaschinen GmbH Teleskopierbarer ausleger
EP0849212A1 (de) 1996-12-20 1998-06-24 Kidde Industries, Inc. Vorrichtung und Verfahren zum Arretieren von teleskopischen Auslegerteilen
JPH11130377A (ja) * 1997-10-29 1999-05-18 Tadano Ltd クレーンの伸縮ブーム支持構造
JP2001158594A (ja) 1999-12-06 2001-06-12 Sumitomo Constr Mach Co Ltd 移動式クレーン

Family Cites Families (2)

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Publication number Priority date Publication date Assignee Title
US4171598A (en) * 1977-10-21 1979-10-23 J. I. Case Company Hollow boom construction
JPH0434297U (de) * 1990-07-19 1992-03-23

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3101017A1 (de) * 1981-01-15 1982-08-05 Fried. Krupp Gmbh, 4300 Essen "kunststoffgleitlagerung"
JPH06217693A (ja) 1993-01-26 1994-08-09 Riken Vitamin Co Ltd 製パン用油脂組成物
EP0702661A1 (de) 1993-06-16 1996-03-27 EC Engineering + Consulting Spezialmaschinen GmbH Teleskopierbarer ausleger
EP0702661B1 (de) * 1993-06-16 1997-12-17 Compact Truck AG Teleskopierbarer ausleger
EP0849212A1 (de) 1996-12-20 1998-06-24 Kidde Industries, Inc. Vorrichtung und Verfahren zum Arretieren von teleskopischen Auslegerteilen
JPH11130377A (ja) * 1997-10-29 1999-05-18 Tadano Ltd クレーンの伸縮ブーム支持構造
JP2001158594A (ja) 1999-12-06 2001-06-12 Sumitomo Constr Mach Co Ltd 移動式クレーン

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102398864A (zh) * 2011-07-12 2012-04-04 长沙中联重工科技发展股份有限公司 伸缩机构、工程机械及消防机械
CN111677756A (zh) * 2020-06-19 2020-09-18 三一汽车起重机械有限公司 导向滑动组件、伸缩臂架及工程机械

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Publication number Publication date
EP2184251B1 (de) 2012-05-16
JP4816776B2 (ja) 2011-11-16
JP2010132456A (ja) 2010-06-17

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