JP2012066882A - Mobile crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mobile crane optimal for lifting work or the like of a very heavy load.SOLUTION: The mobile crane A includes: an annular base ring 1; a revolving frame 3 placed turnably around the center of the base ring through a turning roller device 2 interposed on the base ring; a lifting facility 4 installed on the revolving frame; and a plurality of traveling bodies 5 provided in a travelable manner at the lower face of the base ring at each predetermined angle along the circumferential direction to support the base ring. Each traveling body preferably has a lateral pair of crawlers 61, and is provided at the lower face of the base ring turnably through the turning device 62.

Description

  The present invention relates to a large mobile crane used for lifting a heavy object.

  In general, as a mobile crane, for example, as disclosed in Patent Document 1, a lower traveling body that can travel on a crawler or a wheel, and an upper portion that is mounted on the lower traveling body so as to be capable of turning via a turning device. The thing provided with the turning body which consists of a turning body and the boom, winch, etc. which were equipped on this upper turning body is known well. In this case, in order to ensure the same stability in the entire circumference, for example, the left and right crawlers of the lower traveling body are arranged apart from each other by approximately the same distance as the front and rear length, or an outrigger is provided around the lower traveling body. The structure is taken.

  However, when such a mobile crane is increased in size, the bending moment on the upper swing body becomes large, and there is a limit in transmitting the bending moment on the upper swing body side to the lower traveling body unless the swing device is increased in size. In addition, there is a limit to the increase in size because it becomes impossible to fit within the transportable dimensions or it is economically disadvantageous.

  On the other hand, for heavy lifting work, etc., two mobile cranes may be used for suspension. However, at this time, the load sharing of each crane changes during work because the two cranes have different swivel centers. However, there is a problem that smooth turning work becomes difficult and the efficiency of phase suspension is extremely low.

  Further, as a special crane, for example, as shown in FIGS. 13 and 14, a large annular base ring a is installed on the ground, and a swivel c is installed on the base ring a with a swivel roller device b interposed therebetween. It is known that it is mounted so as to be able to turn around the center of the base ring a and is equipped with a lifting equipment d on the turntable c. The swivel base c includes a front swivel base c1 and a rear swivel base c2 that are respectively placed on the base ring a and sandwiching the center of the base ring a with a swivel roller device b interposed therebetween. One end is connected to the base c1 and the rear side turntable c2, respectively, and the connection stand c3 is bridged between the two turntables c1 and c2. The upper part of the pivot shaft e arranged perpendicularly on the center line of the base ring a is penetrated or fitted in the central portion of the connecting frame c3 so as to be relatively rotatable, and the lower end of the pivot shaft e is connected to the base ring a. It is supported on the center part of the support beam f assembled inside in a cross shape. Thus, the swivel c is swiveled around the swivel axis e as the swivel roller device b travels on the bail ring a. Further, the lifting equipment d is mounted on the boom g and mast h, the base ends of which are supported by the front swivel c1, respectively, the counterweight i mounted on the rear swivel c2, and the connecting frame c3. A plurality of winches j, j,.

  In the case of such a crane, since the swivel c rotates on the base ring a, it is not affected by the ground, and since the load is supported by the base ring a, the size is increased without being influenced by the bending moment. However, in order to move, it is necessary to re-install the base ring a, which requires a lot of labor, time, and labor, and also has a problem that it is impossible to carry a suspended load even with a light load.

JP 2010-64818 A

  The present invention has been made in view of the above points, and the problem is that, particularly, by making use of the characteristics that it is suitable for increasing the size of the special crane described above, it is improved to have mobility. It is intended to provide a mobile crane that is optimal for lifting heavy objects.

  In order to solve the above problems, the invention according to claim 1 is a mobile crane that is mounted so as to be able to turn around the center of the base ring via an annular base ring and a turning roller device on the base ring. A swivel mounted on the swivel, a lifting device equipped on the swivel, and a plurality of travels each provided on the lower surface of the swivel so as to support the base ring at predetermined angles along the circumferential direction. A structure comprising a body.

  In this configuration, the swivel roller device travels on the base ring, so that the swivel turns around the center of the base ring, and the orientation of the lifting equipment installed on the swivel is changed, and the base ring is A plurality of supporting traveling bodies travel, so that the position of the base ring can be moved, and a suspended traveling can be performed on a solid ground. In addition, since the load is supported by the base ring, it can be easily increased in size without being affected by the bending moment, and is optimal for lifting heavy objects.

  According to a second aspect and a third aspect of the present invention, in the mobile crane according to the first aspect, specific forms of the swivel base and the lifting equipment are provided. That is, in the invention according to claim 2, the swivel base includes a front swivel base and a rear swivel base that are respectively placed on the base ring and sandwiching the center of the base ring with the swivel roller device interposed therebetween. A connecting frame having one end connected to each of the front swivel base and the rear swivel base, and a central portion provided with a portion constituting a swivel axis together with a base ring side portion so as to swivel around the center of the base ring; The lifting equipment comprises a boom whose base end is supported by the front swivel so that it can be raised and lowered, a counterweight placed on the rear swivel, and a plurality of pieces placed on the connection stand And a winch.

  According to a third aspect of the present invention, the swivel includes a pair of left and right front swivels and a rear swivel mounted on the base ring at two locations sandwiching the center of the base ring, respectively, with a swivel roller device interposed therebetween. A left-side swivel base, a pair of left and right first connection stands each having one end connected to the left front turn table and the rear turn table, or the right front swivel table and the rear turn table, and One end is connected to each of the central parts, and the above-mentioned lifting equipment includes a second connecting frame provided with a part that constitutes a turning shaft together with a part on the base ring side so as to turn around the center of the base ring. A pair of left and right booms whose base ends are supported by the front swivel bases so that they can be raised and lowered, a pair of left and right counterweights mounted on the rear swivel bases, and the first connection bases. Multiple each Have been and a winch, constructed as described above lifting operation or hanging operation of both the boom undulating operations and hook hung via a rope from the leading end of each boom are synchronized.

  In this configuration, when hanging heavy loads with hooks suspended from the ends of a pair of left and right booms of the lifting equipment installed on the swivel respectively via ropes, the pivot center of each boom is the same. The load sharing acting on each boom does not change as the swivel turns. In addition, since the hoisting operation of both booms and the lifting or hanging operation of the hooks suspended from the tip of each boom via the rope are synchronized, the load sharing acting on each boom is related to these operations. It does not change with it.

  According to a fourth aspect of the present invention, in the mobile crane according to the second or third aspect, a preferred form of the swivel roller device is provided. That is, the swivel roller device is attached to each of the front swivel base and the rear swivel base, and each swivel roller device includes a plurality of rollers arranged at predetermined intervals along a straight line, There is an attachment member for attaching these rollers to the lower surface of the front swivel base or the lower surface of the rear swivel base, and is formed on the lower surface of the front swivel base or the lower surface of the rear swivel base at the center of this mounting member. A fitting convex portion that can be fitted into the circular fitting hole formed is formed, and the orientation of the mounting member is changed while the fitting convex portion is fitted in the fitting hole. The arrangement direction is provided so as to be adjustable for each swivel roller device. In this configuration, when the swivel roller device is attached to the lower surface of the front swivel base or the lower surface of the rear swivel base, the arrangement direction of the plurality of rollers arranged on the straight line is set to the fitting hole on the swivel base side on the mounting member side. By changing the direction of the mounting member while the fitting convex portion is fitted, the turning roller device can be easily adjusted.

  According to a fifth aspect of the present invention, in the mobile crane according to any one of the first to fourth aspects, a preferable form of each traveling body is provided. That is, each of the traveling bodies has a pair of left and right crawlers, and is configured to be turnable on the lower surface of the base ring via a turning device. In this configuration, each traveling body that supports the base ring has a pair of left and right crawlers like a lower traveling body of a conventional crawler crane, and is provided on the lower surface of the base ring so as to be capable of turning via a turning device. Therefore, it is possible to easily change the position of the base ring.

  As described above, according to the mobile crane of the present invention, not only the direction of the lifting equipment is changed by turning the swivel base on the base ring, but also a plurality of traveling bodies that support the base ring run and the base Since the position of the ring can be moved, the labor, time and labor required for the movement can be greatly reduced or shortened, and work efficiency can be improved. In addition, since the load is supported by the base ring and can be easily increased in size without being affected by the bending moment, there is an effect that it is optimal for lifting a heavy object.

  In particular, in the invention according to claim 3, when a heavy object is suspended by hooks suspended from the ends of a pair of left and right booms of a lifting equipment installed on a swivel base via ropes, Since the center is the same, the load sharing acting on each boom does not change as the swivel turns, and the boom movement of both booms and the hooks suspended from the ends of the booms via ropes Since the lifting operation or the hanging operation is synchronized, the load sharing applied to each boom is not changed in accordance with these operations. As a result, the heavy lifting work can be performed safely and efficiently.

  In the invention according to claim 4, when the swivel roller device is attached to the lower surface of the front swivel table or the lower surface of the rear swivel table, the arrangement direction of the plurality of rollers arranged on the straight line is fitted on the swivel table side. Since it can be easily adjusted for each turning roller device by changing the direction of the mounting member while the fitting convex part on the mounting member side is fitted in the hole, it can contribute to the facilitation of the mounting work. it can.

  Furthermore, in the invention according to claim 5, each traveling body supporting the base ring has a pair of left and right crawlers like a lower traveling body of a conventional crawler crane, and swivels on the lower surface of the base ring via a swiveling device. Since it is provided, the position of the base ring can be easily changed, and the work efficiency can be further improved.

FIG. 1 is a side view of a part of a mobile crane according to a first embodiment of the present invention viewed through an incision. FIG. 2 is a front view of the same. FIG. 3 is a plan view showing a state before the lifting equipment is installed on the swivel of the mobile crane. FIG. 4 is a view showing a state in which each turning roller device is attached to the front turntable or the rear turntable. 5A and 5B show the swivel roller device, where FIG. 5A is a side view and FIG. 5B is a front view. FIG. 6 is a schematic configuration diagram of the hydraulic drive system of the mobile crane. FIG. 7 is a view corresponding to FIG. 1 showing the second embodiment. FIG. 8 is also equivalent to FIG. FIG. 9 is also equivalent to FIG. FIG. 10 is a view corresponding to FIG. 1 showing the third embodiment. FIG. 11 is also equivalent to FIG. FIG. 12 is also equivalent to FIG. FIG. 13 is a view corresponding to FIG. FIG. 14 is also equivalent to FIG.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments that are modes for carrying out the present invention will be described with reference to the drawings.

(First embodiment)
1 to 3 show the overall configuration of a mobile crane A according to a first embodiment of the present invention. The mobile crane A has a large annular base ring 1 having a diameter of several meters to several tens of meters, and swivels around the center P of the base ring 1 via a swivel roller device 2 on the upper surface of the base ring 1. The swivel base 3 mounted on the swivel base 3, the lifting equipment 4 mounted on the swivel base 3, and the lower surface of the base ring 1 are provided at predetermined angles along the circumferential direction so as to support the base ring 1. A plurality of (8 in the figure) traveling bodies 5, 5,.

  The base ring 1 is formed in a rectangular closed cross section, and four beam members 11, 11,... Are formed in a cross shape with one beam connecting member 12 as the center. A support beam 13 is assembled and attached. The beam connecting member 12 of the support beam 13 is disposed at the center P of the base ring 1, and a cylindrical swiveling shaft disposed on the beam connecting member 12 and coaxially with the center P of the base ring 1. The lower end of 14 is supported.

  The swivel base 3 includes a front swivel base 21 and a rear swivel base 22 that are respectively placed on the base ring 1 and sandwiching the center P of the base ring 1 with the swivel roller device 2 interposed therebetween. The swivel base 21 and the rear swivel base 22 are connected at one end to a swivel base 23 spanned between the swivel bases 21 and 22. The connection base 23 includes three rectangular bases 24, 24, and 24. It is connected in a row in the long side direction. The upper portion of the pivot shaft 14 is penetrated or fitted through a bearing (not shown) in the central portion of the connecting frame 23 (specifically, the central portion of the central rectangular base 24). Thus, the swivel 3 is swiveled around the swivel shaft 14 when the swivel roller device 2 travels on the base ring 1.

  The lifting equipment 4 includes a boom 31 and a mast 32 whose base ends are respectively supported by the front swivel base 21, a cab 33 mounted on the front swivel base 21 on the side of the boom 31 and mast 32, and the above A counterweight 34 mounted on the rear turntable 22, a connecting pole 35 connecting the tip of the mast 32 and the rear turntable 22, and a plurality of winches 36, 36a mounted on the connection mount 23. , 36b. Of the plurality of winches 36, 36 a, 36 b on the connection frame 23, the winch 36 a closer to the front turntable 21 lifts or hangs a hook 38 suspended from the tip of the boom 31 via the hoisting rope 37. A winch 36b on the side close to the rear swivel base 22 includes a lower spreader 39 provided at the tip of the mast 32, and an upper spreader 41 connected to the tip of the boom 31 via a boom guy line 40. The distance between the upper spreader 41 and the lower spreader 39 is expanded or contracted by winding or rewinding one end of the boom hoisting rope 42 that is stretched between the boom hoisting rope 42 and the hoisting angle of the boom 31 is changed.

  As shown in FIGS. 3 and 4, four swivel roller devices 2 are attached to the front swivel base 21 and the rear swivel base 22, respectively. Each swivel roller device 2 has a total of eight rollers 51, 51,... Arranged in parallel in two rows of four at a predetermined interval along a straight line, as shown in enlarged detail in FIG. The front and rear four rollers 51, 51,... Are rotatably held via two front and rear support shafts 52, 52, respectively, and both the roller holding members. 53, 53, one end of which is connected via a connecting shaft 54, and a central portion of the connecting lever 55 is swingably supported via a support shaft 56. The connecting lever 55 and the roller holding member .. Have an attachment member 57 for attaching the eight rollers 51, 51,... To the lower surface of the front turntable 21 or the lower face of the rear turntable 22. The mounting member 57 has a rectangular horizontal plate 57a as the mounting surface, and is formed on the lower surface of the front swivel base 21 or the lower surface of the rear swivel base 22 as a mounting surface at the center of the horizontal plate 57a. A fitting convex portion 57 b that can be fitted into the round fitting hole 58 is formed. Then, the direction of the horizontal plate 57a of the mounting member 57 is changed while the fitting convex portion 57b is fitted in the fitting hole 58, and then the four corners of the horizontal plate 57a are fixed by screwing. The arrangement direction of the eight rollers 51, 51,... Can be adjusted so as to be orthogonal to the straight line connecting the center P of the base ring 1 and the center of the swivel roller device 2 for each swivel roller device 2.

  The swiveling roller device 2 further includes two front and rear roller driving hydraulic motors 59 and 59 attached to the roller holding members 53, and the hydraulic motors 59 are connected via the power transmission unit 60. The two front rollers or the two rear rollers 51 are connected to be able to transmit power.

  Although not shown in detail in the figure, each traveling body 5 has a pair of left and right crawlers 61, 61 as in the case of the lower traveling body of a conventional crawler crane, and each crawler 61 is rotated by a hydraulic motor. It is provided so that it can run. Each traveling body 5 is turnably provided on the lower surface of the base ring 1 via a turning device 62.

  FIG. 6 shows a schematic configuration of the hydraulic drive system of the mobile crane A. Reference numeral 71 denotes a power unit such as an engine mounted on the swivel 3, and the power unit 71 includes a plurality (three in the figure) of hydraulic pumps. 72, 73, 74 are driven. Pressure oil discharged from one of the hydraulic pumps 74 is supplied to each traveling body 5 through a swivel joint 76 disposed in the swivel shaft 14 of the swivel base 3 after passing through the traveling body valve unit 75. ing. Further, the pressure oil discharged from the hydraulic pump 73 is supplied to the hydraulic motor 59 of each turning roller device 2 after passing through the valve unit 77 for the turning roller device, and the pressure oil discharged from the hydraulic pump 72 is The hydraulic circuit of another actuator such as the hydraulic motor of the winch 36 is supplied.

  Next, the operation and effect of the mobile crane A will be described. When a heavy load is lifted, the swivel roller device 2 travels on the base ring 1 so that the swivel base 3 moves around the center P of the base ring 1. The position of the base ring 1 is not only changed by changing the direction of the lifting equipment 4 mounted on the swivel base 3 but also by the traveling bodies 5, 5,. Can be moved. As a result, labor, time, and labor required for movement can be greatly reduced or shortened, and work efficiency can be improved. In addition, since it is possible to perform a suspended load traveling on a solid ground while the suspended load is lifted by the lifting facility 4, work efficiency can be further improved.

  In addition, since the load on the swivel base 3 associated with the lifting work is supported by the base ring 1, the crane A can be easily enlarged without being influenced by the bending moment, and a heavy load can be lifted. It is most suitable for work.

  In particular, in the case of this embodiment, four swivel roller devices 2 are attached to the front swivel base 21 and the rear swivel stand 22 of the swivel base 3 respectively. And a total of eight rollers 51, 51,... Arranged in parallel in a row at a predetermined interval along each of the rollers 51, 51,..., And these rollers 51, 51,. And an attachment member 57 for attaching to the lower surface of the base 22, and the fitting convex portion 57 b formed on the horizontal plate 57 a which is the attachment surface of the attachment member 57 is provided on the lower surface of the front turntable 21 or the rear turntable 22. The direction of the horizontal plate 57a of the mounting member 57 is changed while being fitted in the circular fitting hole 58 formed on the lower surface, and then the four corners of the horizontal plate 57a are fixed by screws. The direction of arrangement of the rollers 51, 51,. Since each roller device 2 is adjustable so as to be orthogonal to a straight line connecting the center P of the base ring 1 and the center of the swivel roller device 2, depending on the travel of each swirl roller device 2 on the base ring 1. The swivel 3 can be smoothly swung around the center P of the base ring 1, and the adjustment of the arrangement direction of the rollers 51, and the mounting operation of the swivel roller device 2 can be easily performed.

  Each of the plurality of traveling bodies 5, 5,... That support the base ring 1 has a pair of left and right crawlers 61, 61 like a lower traveling body of a conventional crawler crane, and is provided on the lower surface of the base ring 1. Since it is provided so that turning is possible via the turning device 62, the position of the base ring 1 can be easily changed.

(Second Embodiment)
7 to 9 show the overall configuration of a mobile crane B according to the second embodiment of the present invention. As in the case of the mobile crane A according to the first embodiment, the mobile crane B includes an annular base ring 101 and a base ring 101 with a turning roller device 102 interposed on the upper surface of the base ring 101. A swivel base 103 mounted so as to be capable of swiveling around the center P thereof, a lifting equipment 104 mounted on the swivel base 103, and a lower surface thereof to support the base ring 101 along a circumferential direction. A plurality of (twelve in the figure) traveling bodies 105, 105,... Provided for each angle are provided. The number of the traveling bodies 105 is increased as compared with the case of the first embodiment so that a larger load can be supported at the time of crane work.

  The base ring 101 is formed in a rectangular closed cross section in the same manner as the base ring 1 in the first embodiment. Further, a support beam 113 is attached to the inside of the base ring 101. The support beam 113 is formed by assembling four beam members 111, 111,... The beam connecting material 112 of the support beam 113 is disposed at the center P of the base ring 101, and a cylindrical swiveling shaft disposed on the beam connecting material 112 and coaxially with the center P of the base ring 101. The lower end of 114 is supported.

  The swivel base 103 includes a pair of left and right front swivel platforms 121 and 121 and a rear swivel mounted on the base ring 101 at two locations sandwiching the center P of the base ring 101 with a swivel roller device 102 interposed therebetween. One end of each of the pedestals 122 and 122 and the left front slewing table 121 and the rear slewing table 122 or the right front slewing table 121 and the rear slewing table 122 are connected and spanned between the two slewing tables 121 and 122. A pair of left and right first connection frames 123, 123, and a second connection frame that is connected between the first connection frames 123, 123 with one end connected to the center of each of the first connection frames 123, 123. 124. The pair of left and right front swivels 121 and 121 and the rear swivels 122 and 122 are all hinged, while each first connecting frame 123 has three rectangular platforms 125, 125, and 125 as long sides. Connected in a row in the direction. Further, the upper part of the pivot shaft 114 is penetrated or fitted in the central portion of the second connection frame 124 through a bearing (not shown) so as to be relatively rotatable. Thus, the swivel 103 is swung around the swivel shaft 114 when the swivel roller device 102 travels on the base ring 101.

  The lifting equipment 104 includes a pair of left and right booms 131 and 131 and a mast 132 (only one shown) each having a base end supported by each front swivel 121 and a side of the boom 131 and the mast 132. A pair of left and right cabs 133 and 133 mounted on the front swivel base 121, a pair of left and right counterweights 134 (only one shown) respectively mounted on the rear swivel table 122, and the masts 132. A pair of left and right connecting poles 135 (only one is shown) that respectively connect the front end of the first rotating base 122 and the corresponding rear swivel base 122, and a plurality of winches 136, 136a, and 136b mounted on the first connecting base 123, respectively. And have. Of the plurality of winches 136, 136 a, and 136 b on each first connection frame 123, the winch 136 a closer to the front turntable 121 lifts the hook 138 suspended from the tip of the boom 131 via the hoisting rope 137. The winch 136b on the side close to the rear swivel base 122 is connected to a lower spreader 139 provided at the tip of the mast 132 and an upper part connected to the tip of the boom 131 via a boom guy line 140. The distance between the upper spreader 141 and the lower spreader 139 is expanded / contracted by winding up or rewinding one end of the boom hoisting rope 142 hung between the spreader 141 and the hoisting angle of the boom 131 is changed. .

  Here, although the control system equipped in the mobile crane B is not shown, the operation is performed in one of the left and right cabs 133 and 133, for example, the cab 133 on the right side (left side in FIG. 8). It has come to be. In addition, the raising and lowering operations of the pair of left and right booms 131 and 131 of the lifting equipment 104 and the lifting or hanging operation of the hook 138 suspended from the tip of each boom 131 via the hoisting rope 137 are synchronized on the control system. It is configured. Further, when hanging the hook 138 from the tip of each boom 131 via the hoisting rope 137, a pair of left and right suspension members 146, 146 suspended from the tip of each boom 131 via the hoisting rope 137, respectively, A suspension beam 147 having one end connected to each of the suspension members 146 and 146 is used, and a hook 138 is suspended from an intermediate portion of the suspension beam 147.

  Four turning roller devices 102 are attached to each of the front turntables 121 and the rear turntables 122. Each swivel roller device 102 is not shown in detail in the figure, but has the same configuration as the swivel roller device 2 in the case of the first embodiment.

  Although not shown in detail in the figure, each traveling body 105 has a pair of left and right crawlers 161 and 161 as in the case of the lower traveling body of a conventional crawler crane, and each crawler 161 is rotated by a hydraulic motor. It is provided so that it can run. Each traveling body 105 is turnably provided on the lower surface of the base ring 101 via a turning device 162.

  And in the mobile crane B as well, as in the case of the mobile crane A of the first embodiment, the swivel base 103 turns on the base ring 101 and the direction of the lifting equipment 104 is changed. Since the plurality of traveling bodies 105, 105,... That support the base ring 101 can travel and move the position of the base ring 101, labor, time, and labor required for the movement can be greatly reduced or shortened. , Work efficiency can be improved. In addition, since the load is supported by the base ring 101 and can be easily increased in size without being affected by the bending moment, there is an effect that it is optimal for lifting a heavy object.

  In particular, in the case of this embodiment, heavy loads are suspended by hooks 138 suspended from the ends of a pair of left and right booms 131 and 131 of a lifting equipment 104 mounted on a swivel base 103 via hoisting ropes 137, respectively. When performing, since the turning center of each boom 131 is the same, the load sharing which acts on each boom 131 does not change with turning of the turntable 103. Further, the raising and lowering operations of the booms 131 and 131 and the lifting operation or the hanging operation of the hook 138 suspended from the tip of each boom 131 via the hoisting rope 137 are synchronized. The applied load sharing does not change with these operations. As a result, there is a specific effect that the heavy lifting work can be safely and efficiently performed.

(Third embodiment)
10 to 12 show the overall configuration of a mobile crane C according to a third embodiment of the present invention. As in the case of the mobile crane A according to the first embodiment, the mobile crane C has an annular base ring 201 and a base ring 201 with a turning roller device 202 interposed on the upper surface of the base ring 201. A swivel 203 placed so as to be able to swivel around the center P of the swivel, a lifting equipment 204 equipped on the swivel 203, and a lower surface of the base ring 201 so as to support the base ring 201 along a circumferential direction. A plurality of (16 in the figure) traveling bodies 205, 205,... Each provided for each angle are provided.

  The base ring 201 includes two inner and outer rings 201a and 201b, and each of the rings 201a and 201b has a rectangular closed cross section. A support beam 213 formed by assembling four beam members 211, 211,... Around a single beam connecting member 212 is attached to the inside of the base ring 201 (specifically, inside the inner ring 201 a). It has been. The beam connecting member 212 of the support beam 213 is disposed at the center P of the base ring 201, and a cylindrical swiveling shaft disposed on the beam connecting member 212 and coaxially with the center P of the base ring 201. The lower end of 214 is supported.

  The swivel base 203 includes a pair of left and right front swivels 221, 221 and a rear swivel mounted on the base ring 201 and sandwiching the center P of the base ring 201 with the swivel roller device 202 interposed therebetween. One end of each of the bases 222, 222 and the left front swivel base 221 and rear swivel base 222 or the right front swivel base 221 and rear swivel base 222 is connected and spanned between the two swivel bases 221 and 222. A pair of left and right first connection frames 223 and 223, and a second connection frame that is connected between the first connection frames 223 and 223 with one ends connected to the central portions of the first connection frames 223 and 223, respectively. 224. The pair of left and right front swivels 221, 221 and the rear swivels 222, 222 are all connected via a third connecting stand 225, while each first connecting stand 223 has three rectangular bases. 226, 226, and 226 are connected in a row in the long side direction. Further, the upper portion of the pivot shaft 214 is penetrated or fitted in the center portion of the second connection frame 224 via a bearing (not shown) so as to be relatively rotatable. Thus, the swivel 203 is swiveled around the swivel axis 214 when the swivel roller device 202 travels on the base ring 201.

  The lifting equipment 204 includes a pair of left and right booms 231, 231 and a mast 232 (only one of which is shown), each of which is supported by the front swivel base 221 and a side of the boom 231 and the mast 232. A pair of left and right cabs 233 and 233 respectively mounted on the front swivel 221, a pair of left and right counterweights 234 (only one shown) mounted on the respective rear swivel 222, and each mast 232 A pair of left and right connecting poles 235 (only one is shown) for connecting the front end of each of the two and the corresponding rear swivel base 222, and a plurality of winches 236, 236a, 236b mounted on the first connecting base 223, respectively. And have. Of the plurality of winches 236, 236 a, 236 b on each first connection frame 223, the winch 236 a on the side close to the front turntable 221 lifts the hook 238 suspended from the tip of the boom 231 via the hoisting rope 237. A winch 236b near the rear swivel base 222 is connected to a lower spreader 239 provided at the tip of the mast 232 and an upper part connected to the tip of the boom 231 via a boom guy line 240. The distance between the upper spreader 241 and the lower spreader 239 is expanded and retracted by winding or rewinding one end of the boom hoisting rope 242 that is stretched between the spreader 241 and the hoisting angle of the boom 231 is changed. .

  Here, although the control system equipped in the mobile crane C is not shown, the operation is performed in one of the left and right cabs 233 and 233, for example, the cab 233 on the right side (left side in FIG. 11). It has come to be. Further, the lifting operation of the pair of left and right booms 231 and 231 of the lifting equipment 204 and the lifting operation or the hanging operation of the hook 238 suspended from the tip of each boom 231 via the hoisting rope 237 are synchronized on the control system. It is configured. Further, when the hook 238 is suspended from the tip of each boom 231 via the hoisting rope 237, a pair of left and right suspension members 246, 246 suspended from the tip of each boom 231 via the hoisting rope 237, and A suspension beam 247 having one end connected to each of the suspension members 246 and 246 is used, and a hook 238 is suspended from an intermediate portion of the suspension beam 247.

  Four swivel roller devices 202 are attached to each of the front swivel bases 221 and the rear swivel bases 222. Of the four swivel roller devices 202, 202,. The two swivel roller devices 202 and 202 near the third connecting member 225 are on the inner ring 201a of the base ring 201, and the two swivel roller devices 202 and 202 on the side away from the third connecting member 225 are the base ring 201. Each travels on the outer ring 201b. Each swivel roller device 202 is not shown in detail in the figure, but has the same configuration as the swivel roller device 2 in the case of the first embodiment.

  Although not shown in detail in the figure, each traveling body 205 has a pair of left and right crawlers 261 and 261 as in the case of the lower traveling body of a conventional crawler crane, and each crawler 261 is rotated by a hydraulic motor. It is provided so that it can run. Further, each traveling body 205 is provided so as to be capable of turning along the circumferential direction of the base ring 1 alternately on the lower surface of the inner ring 201 a or the lower surface of the outer ring 201 b via the turning device 262.

  And also in the said mobile crane C, not only in the case of the mobile crane A of 1st Embodiment, the swivel base 203 turns on the base ring 201, and the direction of the lifting equipment 204 is changed, Since the plurality of traveling bodies 205, 205,... Supporting the base ring 201 can travel and move the position of the base ring 201, labor, time and labor required for the movement can be greatly reduced or shortened. , Work efficiency can be improved. In addition, since the load is supported by the base ring 201 and can be easily increased in size without being affected by the bending moment, there is an effect that it is optimal for lifting a heavy object.

  Similarly to the case of the mobile crane B of the second embodiment, the hooks hung from the ends of the pair of left and right booms 231 and 231 of the lifting equipment 204 mounted on the swivel base 203 via the hoisting ropes 237, respectively. When suspending a heavy object at 238, since the turning center of each boom 231 is the same, the load sharing acting on each boom 231 does not change as the turning table 203 turns. Further, since the raising and lowering operations of the booms 231 and 231 and the lifting operation or the hanging operation of the hook 238 suspended from the tip of each boom 231 via the hoisting rope 237 are synchronized, The applied load sharing does not change with these operations. As a result, there is a specific effect that the heavy lifting work can be safely and efficiently performed.

  In addition, this invention is not limited to the said 1st thru | or 3rd embodiment, Various other forms are included. For example, in each of the above embodiments, each traveling body 5, 105, 205 has a pair of left and right crawlers 61, 61, 161, 161 or 261, 261, and is provided on the lower surface of the base ring 1, 101, 201, respectively. Although it has been configured so as to be capable of turning via the turning devices 62, 162, 262, the present invention can be configured to run each traveling body with one crawler instead of such a configuration, You may comprise so that it may drive | work with a wheel.

  Moreover, in each said embodiment, it has boom 31,131,231 as lifting equipment 4,104,204, and it suspends from the front-end | tip of this boom 31,131,231 via the hoisting ropes 37,137,237. However, the present invention is not limited to this, and the base end of the jib is connected to the tip of the boom, and the hoisting rope is connected to the tip of the jib. Needless to say, the present invention can also be applied to an object that performs a hanging work with a hook suspended through a hook.

  Further, in each of the above embodiments, the swivel bases 3, 103, 203 are swung around the center P of the base rings 1, 101, 201 via the swivel roller devices 2, 102, 202 on the base rings 1, 101, 201. In order to be able to be mounted, the pivot shafts 14, 114, 214 extend vertically upward on the beam connecting members 12, 112, 212 of the support beams 13, 113, 213 attached inside the base rings 1, 101, 201, respectively. The upper part of the pivot shafts 14, 114, 214 is configured to penetrate or fit to the connecting base 23 of the rotating bases 3, 103, 203 or the second connecting bases 124, 224 through bearings so as to be relatively rotatable. However, in the present invention, conversely, a swivel shaft extending vertically downward is provided on the lower surface of the connection base 23 of the swivel bases 3, 103, 203 or the second connection bases 124, 224, The lower part of the pivot shaft may be configured to penetrate or fit into the beam connecting members 12, 112, 212 of the support beams 13, 113, 213 through a bearing so as to be relatively rotatable. A cylindrical first member extending vertically upward is provided on the beam connecting members 12, 112, 212 of the support beams 13, 113, 213 attached to the insides of the 101, 201, and a connecting frame for the swivels 3, 103, 203 23 or a second member extending vertically downward on the lower surface of the second connection frame 124, 224 and fitted in the first member via a bearing, and the pivot shaft is constituted by the first member and the second member. It may be.

A, B, C Mobile crane P Center of base ring 1,101,201 Base ring 2,102,202 Swivel roller device 3,103,203 Swivel base 4,104,204 Lifting equipment 5,105,205 Traveling body 14 , 114, 214 Rotating shaft 21, 121, 221 Front swivel 22, 122, 222 Rear swivel 23 Link base 31, 131, 231 Boom 34, 134, 234 Counterweight 36, 36a, 36b, 136, 136a, 136b , 236, 236a, 236b winch 51 roller 57 mounting member 57b fitting convex part 58 fitting hole 61, 161, 261 crawler 62, 162, 262 swivel device 123, 223 first connection stand 124, 224 second connection stand

Claims (5)

An annular base ring,
A swivel mounted on the base ring so as to be capable of swiveling around the center of the base ring via a swivel roller device;
Lifting equipment installed on this swivel,
A mobile crane comprising: a plurality of traveling bodies, each of which is provided at a predetermined angle along a circumferential direction on a lower surface of the base ring so as to support the base ring. The swivel includes a front swivel and a rear swivel mounted on a base ring at two locations sandwiching the center of the base ring with a swivel roller device interposed therebetween, and the front swivel and the rear swivel. One end is connected to each other, and in the center part, a connecting frame provided with a part that constitutes a turning axis together with a part on the base ring side so as to turn around the center of the base ring,
The lifting equipment includes a boom whose base end is supported by the front swivel so that it can be raised and lowered, a counterweight placed on the rear swivel, and a plurality of winches placed on the connection stand. The mobile crane according to claim 1. The swivel includes a pair of left and right front swivel and rear swivel mounted on the base ring and sandwiching the center of the base ring with a swivel roller device interposed therebetween, and the left front swivel. A pair of left and right first connecting frames each having one end connected to the front and rear swivel units or the right front swivel table and the rear swivel table, and one end connected to the central portion of each of the first connecting frames. And a second connecting frame provided with a part that constitutes a turning axis together with a part on the base ring side so as to turn around the center of the base ring,
The lifting equipment includes a pair of left and right booms whose base ends are supported so as to be raised and lowered on the front swivel bases, a pair of left and right counterweights mounted on the rear swivel bases, and the first couplings. A plurality of winches each mounted on a gantry, and the hoisting operation of both the booms and the lifting operation or the hanging operation of the hook suspended from the tip of each boom via a rope are synchronized. The mobile crane according to claim 1.   The swivel roller device is attached to each of the front swivel base and the rear swivel base, and each swivel roller device includes a plurality of rollers arranged at predetermined intervals along a straight line, And a mounting member for mounting the roller to the lower surface of the front swivel base or the lower surface of the rear swivel base, and a circle formed on the lower surface of the front swivel base or the lower surface of the rear swivel base at the center of the mounting member. A fitting convex portion that can be fitted into a fitting hole having a shape is formed, and the direction of the mounting member is changed while the fitting convex portion is fitted in the fitting hole, thereby arranging a plurality of rollers. The mobile crane according to claim 2 or 3, wherein each of the swivel roller devices is adjustable.   5. The movable type according to claim 1, wherein each of the traveling bodies has a pair of left and right crawlers, and is provided on the lower surface of the base ring so as to be capable of turning via a turning device. crane.