JP2008239262A - Wheel unit for crane and overhead crane using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wheel unit for a crane capable of running smoothly and stably when it moves along running rails a front and a rear traversing frame fitted with winches and also structured small and compact. <P>SOLUTION: The wheel unit to move the winches along the left and right rails arranged at a certain spacing is equipped with saddle frames coupled with a lifting frame whereon the winches are mounted, a plurality of running wheels borne on the saddle frames, and a driving means to drive the running wheels. Each saddle frame is configured with a plurality of frame members coupled with the lifting frame and having a prescribed length along the running rails, wherein the frame members, (1) bear the respective running wheels in the fore-and-aft arrangement along the running rails, (2) are arranged so as to be in series fore and aft about the running direction along the running rails, and (3) are shaft coupled so that their end parts adjoining fore and aft to each other are rotatable in the vertical direction with respect to the tread surfaces of the rails. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a wheel unit such as an overhead crane and an overhead crane, and relates to an improvement in a traveling wheel structure that moves a lifting machine carried on two front and rear transverse rails along a pair of left and right traveling rails.

  In general, various types of cranes as hoisting devices are known depending on applications, and overhead cranes installed on the ceilings of various buildings are widely known. In such an overhead crane, a pair of left and right traveling rails that run vertically in a predetermined work area are arranged, and girder is attached to the left and right traveling rails so as to be able to travel with a wheel unit. A trolley is mounted along the traverse rail laid on the girder, and the trolley is equipped with a hoisting device (such as a hoist). Therefore, a trolley equipped with a hoisting device runs vertically in the X direction along the traveling rail and moves in the Y direction along the traversing rail to move a load (heavy object) to an arbitrary position in the XY direction of the work area. It is known as a crane structure to convey.

  Conventionally, as such an overhead crane, for example, as disclosed in Patent Document 1, a girder is movably attached to a pair of left and right traveling rails via a wheel unit, and a trolley is moved to a traverse rail laid on the girder. Wearing is possible. The trolley is equipped with a hoisting machine. Therefore, the weight of the transported object suspended from the hoisting machine is supported by the trolley and the girder on which the trolley is mounted, and this girder is supported by the traveling rail via a wheel unit (generally called a saddle unit).

  Further, a so-called double rail type trolley structure in which the above-described traverse frame is configured by two rail members (girder) arranged side by side at a distance is disclosed in Patent Document 2, for example. In this document, a trolley is mounted so as to straddle two rail members arranged at appropriate intervals in the front and rear direction, and the two rail members (girder) are supported so as to be able to run by a saddle equipped with wheels on a pair of left and right running rails. A structure has been proposed. It is known that such a double rail type crane structure can suspend a heavier haulage, and that the device configuration can be made smaller and more compact by dispersing the haulage of the haulage. Yes.

  Therefore, the wheel unit that supports the girder is required to smoothly roll on the traveling rail while supporting the weight of the transported object. For this reason, the wheel unit is composed of a plurality of wheels and a frame structure (saddle frame) that evenly distributes the weight to the wheels. The wheel unit disclosed in Patent Document 1 is composed of a plurality of front and rear wheels along a traveling rail, and the front and rear wheels are axially supported by a beam-shaped frame arranged in the traveling direction. In Patent Document 2, a plurality of wheels arranged on two front and rear traverse rails are respectively supported on a beam-shaped frame.

However, a traveling rail installed in a building may be bent and distorted due to a change in the weight of a transported object or a temperature environment. If the rail tread surface of the traveling rail is distorted, a plurality of traveling wheels arranged in the front and rear are subjected to a biased weight load, which causes problems in the failure and durability of the traveling wheel. Therefore, in order to prevent such a deviation of the weight load on the traveling wheels due to the distortion of the traveling rail, the bogie structure of Patent Document 3, for example, has been conventionally employed. In this document, a pivot frame that pivotally supports a girder is provided, and a wheel frame that supports a plurality of front and rear wheels is supported on the pivot frame. In this publication, the first and second pivot frames are stacked in a vertically swingable manner, and a wheel frame having a plurality of front and rear wheels supported by a bottom pivot frame is supported.
JP-A-6-263379 (FIG. 1) JP-A-8-12262 (FIG. 1) JP 2002-241076 A

  As described above, the double rail (girder) traveling crane structure in which the traverse frame for lifting and supporting the transported object is constituted by two front and rear traverse rails, the entire apparatus can be configured in a small size and a compact size. It is known that it can carry heavy goods. For this reason, for example, when a crane is installed in a limited space such as a clean room, or in particular, it is frequently used as a crane structure for suspending a heavy load.

  However, in such a crane structure, when the parallel first and second girders are connected to and supported by a single saddle frame as described in Patent Document 2, the weight of the front and rear girders acts on a plurality of wheels. This hinders smooth running, or causes troubles in running wheel failure and durability. Similarly, even in a crane structure other than the above-described double rail structure, if the wheel diameter of the traveling wheel is made small to reduce the size of the equipment, a large number of wheels must be arranged to support the weight. The durability of the traveling wheel that supports the girder constituting the lifting frame is superior in weight resistance as the outer peripheral diameter and the axle diameter are larger, but conversely, the apparatus is increased in size, particularly in the height dimension.

  When a large number of wheel trains are arranged along the traveling rail in this way, the load applied to each wheel is biased due to distortion of the traveling rail. In such a case, a bogie type suspension structure as disclosed in Patent Document 3 is conventionally used. In this bogie type suspension structure, a balance-like pivot frame must be arranged in one or more stages between a saddle frame that supports (bears) and a girder. As a result, there arises a problem that the size of the equipment is increased, in particular, the height dimension in the lift direction is increased. In other words, several frames (two in the document 3) must be arranged on the saddle frame for vertically moving a plurality of front and rear wheel trains according to the distortion of the traveling rail. This requires an unnecessarily high height between the traveling rail and the trolley on which the hoisting machine is mounted, and becomes a major obstacle when employed in a limited space such as an existing building or a clean room.

  Therefore, the present inventor supports the weight load applied to the first girder and the weight load applied to the second girder by separate saddle frames in the double rail traveling type crane structure arranged at the front and rear. Even if it is a rail surface that is distorted without independent running of individual wheels by axially connecting the two saddle frames before and after the saddle frame so that they can move up and down with respect to the traveling surface of the traveling rail. The idea was that it fits evenly and rotates smoothly, which makes it possible to reduce the size of the equipment and make it more stable and stable.

  The present invention provides a crane wheel unit that can smoothly and stably travel when moving two front and rear traversing frames mounted with a hoist along a traveling rail, and at the same time has a compact and compact structure. The main issue is that. A further object of the present invention is to provide an overhead crane that can be installed in a limited space such as an existing building or a clean room.

  The present invention employs the following configuration in order to solve the above problems. A saddle frame (wheel unit that moves the hoisting device along a pair of left and right traveling rails arranged at predetermined intervals, and is connected to a lifting frame (girder 12 in a ceiling clay) on which the hoisting device is mounted ( 30, 40), a plurality of traveling wheels (32, 42) supported by the saddle frame, and driving means (M3, M4) for driving the traveling wheels. Each of the saddle frames is composed of a plurality of frame members connected to the lifting frame and having a predetermined length (L1) along the traveling rail (11). A plurality of traveling wheels (32, 42) are axially supported along the traveling rail, (2) arranged in series in the traveling direction along the traveling rail, and (3) end portions adjacent to each other in the longitudinal direction. (30Z, 40Z) are connected to the rail tread surface (11y) so as to be pivotable in the vertical direction.

  The lifting frame includes a first lifting frame (12a) and a second lifting frame (12b) arranged in parallel at a distance in the front and rear direction of the traveling rail, and the saddle frame is The first frame member (30) connected to the first lifting frame and the second frame member (40) connected to the second lifting frame.

  The plurality of frame members are connected in series along the traveling rail by connecting pin members to shaft holes having substantially the same diameter provided at adjacent end portions, and the plurality of frame members are traveling surfaces of the traveling rail. Are connected to the connecting pin member (45) so as to be rotatable in the vertical direction.

  The plurality of frame members are composed of first and second frame members (30, 40) connected to each other, and the first frame member (30) and the second frame member (40) are respectively A front row wheel (32a, 32b, 42a, 42b) and a rear row wheel (32c, 32d, 42c, 42d) are arranged, and the first drive motor (M3) is arranged on the front row wheel (32a) in the first frame member. In the second frame member, the second drive motor (M4) is connected to the last row wheel (42d).

  The wheels disposed on the plurality of frame members are provided with a metal wheel and a lining made of rubber, synthetic resin or the like, and a synthetic resin bush is mounted on the shaft holes provided on the plurality of frame members.

  The overhead crane according to the present invention employs the following configuration. A pair of left and right traveling rails (11a, 11b) arranged at a predetermined interval, girder (12a, 12b) installed between the left and right traveling rails, and transverse rails (15a, 15b) laid on the girder A trolley (20) movable along the trolley and a hoisting device (25, 26) mounted on the trolley. The girder is composed of a first girder (12a) and a second girder (12b) which are arranged side by side along the traveling rail, and the first and second girder are respectively provided with a first girder and a second girder. Saddle frames (30, 40) are connected, and the first and second saddle frames are (1) each configured in a frame shape having a predetermined length (L1) along the traveling rail, and (2) A plurality of wheels (32, 42) are rotatably supported on the front and rear along the traveling rail, and (3) are arranged in series along the traveling rail in the front and rear in the traveling direction, and (4) End portions (30Z, 40Z) adjacent to each other in the front-rear direction are axially connected to the rail tread surface (11y) so as to be rotatable in the vertical direction.

  The first saddle frame is integrally attached to the first girder and the second saddle frame is integrally attached to the second girder by fixing means such as bolts.

  In the present invention, a lifting frame (a girder in the case of an overhead crane) that supports and supports a hoisting machine is connected and supported by a plurality of saddle frames, and the plurality of saddle frames are connected to a traveling rail in series before and after the traveling direction. Since the adjacent ends of each saddle frame are axially connected to the rail tread so as to be rotatable in the vertical direction, a plurality of traveling wheels supported by the saddle frame are distorted on the tread of the traveling rail. However, there is no fear that a load that is biased to the front and rear wheels by moving up and down to follow this will be applied.

  Accordingly, it is possible to arrange a large number of wheels on the saddle frame in the front-rear direction, and the wheel diameter can be reduced. In particular, it is possible to significantly reduce the height of a saddle frame that supports a plurality of front and rear wheels and is attached to a lifting frame such as a girder via a balance-like pivot frame. It is possible to equip the designated work space with a crane device in a compact manner.

  Furthermore, in the present invention, two girder front and rear are arranged in the traveling direction of the traveling rail, and a saddle frame is connected to each of the first and second girders in a crane structure in which a hoisting device is mounted on the girder. A plurality of traveling wheels are supported on the frame, and adjacent ends of the saddle frame are connected to each other, so that the hoist mounted on the first and second girder and the transported object suspended on the same can be traveled stably. Can be transported smoothly. In other words, since the two girders equipped with the hoisting machine are supported on the running rail by individual saddle frames and a plurality of wheels supported by the saddle frames, the load is biased to the saddle frames due to dimensional errors between the girders and rattling. Does not work.

  Thus, in the present invention, saddle frames bearing a plurality of wheels are arranged in series along the traveling rail in the front-rear direction so that adjacent end portions of each saddle frame can be rotated vertically with respect to the rail tread surface. Therefore, even if the traveling rail is slightly distorted, the front and rear wheels move up and down so as to follow this, and the load of the lifted object is evenly supported. At the same time, the distance between the front and rear of the traveling wheels arranged in the front and rear is maintained in a predetermined posture and positional relationship with the saddle frames that are connected to each other. It is. Accordingly, since the front and rear saddle frames are connected to each other without providing a balance member such as a pivot frame as in the conventional bogie type suspension structure, the load and load balance is obtained. The structure for this purpose is simple and can be manufactured at low cost. In particular, the size in the head direction of a clean room or the like can be reduced and downsized.

  Further, the plurality of wheels respectively arranged on the saddle frames connected to each other are steered by connecting the first drive motor to the front row wheel in the traveling direction and the second drive motor to the last row wheel. It is possible to travel with richness.

  The present invention will be described in detail below based on the preferred embodiments shown in the drawings. FIG. 1 is an explanatory diagram of an overall configuration of an overhead crane provided with a wheel unit of the present invention, and FIG. 2 is an explanatory diagram of a layout configuration (plane) of a traveling rail and a traverse rail. 3 and 4 are explanatory diagrams of the configuration of the hoist and the trolley equipped with the hoist. 5 to 7 are explanatory views of the detailed configuration of the wheel unit (saddle unit) according to the present invention, and FIG. 8 is an explanatory view of the operation state thereof.

[Description of overhead crane configuration]
First, a configuration of an overhead crane B using a wheel unit A described later will be described with reference to FIG. As shown in FIG. 1, the overhead crane B arranges a pair of left and right traveling rails 11 (11a, 11b) in a work area such as a building. For example, a frame member is installed on a side wall of a building, and the running rail 11 is laid on the frame member. The right traveling rail 11a and the left traveling rail 11b are disposed substantially on a horizontal plane, and spans L of both rails are disposed so as to be parallel to each other at an equal distance. A girder (girder) 12 is bridged between the left and right traveling rails 11 configured as described above. The girder 12 may be composed of a single beam member. However, when carrying a heavy load or placing it in a small work area, a girder 12 is constructed in a double rail structure with a pair of girders before and after the traveling direction. To do. The girder 12 shown to Fig.2 (a) and (b) is comprised by the 1st girder 12a and the 2nd girder 12b, and both are arrange | positioned in parallel at predetermined intervals before and behind the running direction. The girder 12 is constructed to have a strength dimension that can withstand the weight of the transported item and is not easily bent. Depending on the configuration of the apparatus, the girder 12 is provided with a pedestrian bridge 13 that also serves as an inspection sidewalk, and 14 in the figure is a handrail for safety.

  The girder 12 is provided with a traverse rail 15 that supports a trolley 20 to be described later so as to travel. A first traverse rail 15a is laid on the first girder 12a, and a second traverse rail 15b is laid on the second girder 12b. The transverse rails 15a and 15b are disposed between the right traveling rail 11a and the left traveling rail 11b. Therefore, the traveling rails 11a and 11b are laid in the XX direction shown in FIG. 2A, and the first and second traverse rails 15a and 15b are laid in the YY direction. A trolley 20 (described later) on which a hoisting machine is mounted is supported along the traverse rails 15a and 15b so as to be movable left and right (movable in the Y direction in FIG. 1).

[Structure of trolley]
Next, the configuration of the trolley shown in FIGS. 3 and 4 will be described. The trolley 20 is supported so as to be movable along the traverse rail 15 described above. Therefore, the trolley 20 includes a frame frame (hereinafter referred to as “unit frame”) 22 and traveling wheels 21 that are rotatably supported by the trolley 20. As shown in FIG. 3A, the illustrated frame 22 includes a first leg frame 22a installed on the first girder 12a and a second leg frame 22b installed on the second girder 12b, and a space between the two leg frames. The mounting frame 22c is supported by cross-linking. The traveling wheels 21 are axially supported on the first and second leg frames so that four front and rear wheels are rotatable. As shown in FIG. 4B, each traveling wheel 21 is lined with a resin, such as a urethane resin or a fluororesin, on the outer periphery of a metal wheel. The reference numeral 21a denotes an axle.

  The frame 22 constructed in this way has the first leg frame 22a laid on the first girder 12a and the second leg frame 22b on the second girder 12b. Are installed via respective traveling wheels 21. Each traveling wheel 21 is placed and supported on the first and second traversing rails 15a and 15b. The traveling wheel 21 is composed of a driving wheel and a driven wheel. The driving wheel includes a driving motor (hereinafter referred to as "traversing motor M1"). ) (See FIG. 3A). The first and second leg frames 22a and 22b have guide rollers 27 (see FIG. 6A) that engage with the side surfaces 15y of the traverse rails 15a and 15b separately from the traveling wheels 21 described above, for example, in front and rear. It is arranged at the place. The guide rollers 27a and 27b are engaged and supported on the side surfaces of the transverse rails 15a and 15b to prevent meandering when the trolley 20 is moved left and right by the traveling wheels 21.

  A main hoisting machine 25 and an auxiliary hoisting machine 26 are mounted on the unit frame 22. The main hoisting machine (hereinafter referred to as “main hoist”) 25 is configured with a large capacity for large loads, and the auxiliary hoisting machine (hereinafter referred to as “sub hoist 26”) 26 is configured with a small capacity for small loads. ing. The configuration of the hoisting machines 25 and 26 will be described. In the hoisting machine 25 (26), a drive rotary shaft (not shown) is provided in the casing 25a (26a), and a load sheave (not shown) is attached to the drive rotary shaft. It has been. A pulling member such as a chain or a rope is wound around the load sheave. Suspension hooks 25x and 26x are connected to the tip of the pulling member. Further, a winding motor M2 is connected to the drive rotating shaft via a reduction gear. Electrical components such as brakes and limit switches are built in the casing 25a.

  The main hoist 25 and the sub hoist 26 described above are fixedly installed on the mounting frame 22 c of the unit frame 22. Accordingly, these hoists 25 and 26 can be moved in the direction of FIG. 1Y along the traverse rail 15, and can be moved in the direction of FIG. 1X along the traveling rail 11 via the girder 12 on which the traverse rail 15 is laid. It becomes possible to move to an arbitrary position in the -Y direction.

  In this way, the main hoist 25 and the sub hoist 26 are installed on the trolley 20, and are supported by the traveling wheels 21 of the trolley 20 so as to be movable in position, and the suspension hooks 25x of the hoists 25x, The transported goods will be suspended by 26x. The trolley 20 is moved left and right (in the Y direction in FIG. 1) along the transverse rail 15 by a transverse motor M1 attached to the traveling wheel 21. In the present invention, it is not always necessary to mount the sub hoist 26 on the trolley 20. When the transported object may be swayed during transportation, it is supplementarily suspended or when a tool is suspended. use.

[Configuration of wheel unit]
A wheel unit A (hereinafter referred to as “saddle unit A”) that supports the first and second girders 12a and 12b on the traveling rail 11 so as to be movable is described. FIG. 5 is a front view of the saddle unit A, FIG. 6 is an enlarged view of a main part thereof, (b) shows a driving part of a traveling wheel, and (c) shows an installation engaging part to the traveling rail. Yes. In addition, the figure (a) shows the engaging part of the trolley 20 and girder which were demonstrated previously. FIG. 7A shows a planar configuration of the saddle unit A, and FIGS. 7B and 7C are explanatory views of a connecting portion.

  Therefore, as described above, the saddle unit A that supports one or two girders (lifting frames) on the right traveling rail 11a and the left traveling rail 11b is configured as follows. The configuration of the saddle unit A that supports the illustrated first and second girders 12a and 12b on the traveling rail 11 will be described below. As shown in FIG. 5, a first saddle frame (frame member) 30 is connected to the first girder 12a, and a second saddle frame 40 (frame member) is connected and fixed to the second girder 12b by fixing bolts 31, 41. ing. The first and second saddle frames 30, 40 are constituted by a frame having a predetermined length L1 along the traveling rails 11a, 11b. A plurality of traveling wheels 32 and 42 along the traveling rails 11a and 11b are axially supported on the first and second saddle frames 30 and 40, respectively.

  That is, as shown in FIG. 7A, the first and second saddle frames 30, 40 have axles 33, 43 supported between the side frames 30a, 30b and the side frames 40a, 40b. Wheels 32 and 42 are axially supported. In the illustrated example, traveling wheels 32a, 32b, 32c, and 32d are axially supported by the first saddle frame 30, and traveling wheels 42a, 42b, 42c, and 42d are axially supported by the second saddle frame 40, respectively. The four rows of traveling wheels 32 and 42 are pivotally supported so that they are positioned on the same plane. 7A, the first traveling motor M3 is connected to the axle of the traveling wheel 32a located in the frontmost row of the first saddle frame 30 when connected to the axle via a reduction gear when moving leftward. A second traveling motor M4 is connected to the traveling wheel 42d located in the last row of the second saddle frame 40 via a reduction gear. The connection structure of the first and second traveling motors M3 and M4 and the traveling wheels 32 and 42 is composed of a reduction gear G0 and wheels 32 and 42 fixed to the output shaft of the traveling motor as shown in FIG. It is connected by a reduction gear G1 fixed to the side.

  Therefore, the first saddle frame 30 and the second saddle frame 40 configured as described above are arranged in series along the traveling rail 11 in the front-rear direction, and traveling wheels 32a to 32d attached thereto. And 42a to 42d are arranged along the rail tread 11y. The end edge 30z of the first saddle frame 30 and the end edge 40z of the second saddle frame 40 are axially connected by a connecting pin member 45 so as to be rotatable in the vertical direction with respect to the rail tread surface 11y. FIGS. 7B and 7C show an enlarged state, in which a shaft hole 34 h is formed in the bracket 34 integrally fixed to the first saddle frame 30, and a shaft 44 is integrated in the bracket 44 integrated in the second saddle frame 40. A hole 44h is formed, and a bushing 45v with a flange which is a sliding bearing made of synthetic resin or the like is fitted into both shaft holes, and a connecting pin member 45 having substantially the same diameter as the shaft hole diameter of the bush 45v penetrates the bush 45v. It is inserted. In particular, the shaft holes 34h and 44h are formed in the same direction as the axles 33 and 43, respectively, and are connected by a connecting pin member 45 via a bush 45v. Accordingly, although the relative positions of the first and second saddle frames 30 and 40 shown in the direction of FIG. 1X are restricted, they are connected to be pivotable (bendable) about the connecting pin member 45 and are viewed in the direction of the arrow (FIG. 7 ( The meandering to b) is regulated.

  The first saddle frame 30 and the second saddle frame 40 have guide rollers 36 and 46 (see FIG. 6C) that engage with the side surfaces of the traveling rails 11a and 11b separately from the traveling wheels 32 and 42 described above. ) Are disposed on the saddle frames 30 and 40, for example, at two positions in the front and rear, and the first and second girders 12a and 12b are prevented from meandering when the traveling wheels 32 and 42 move back and forth. That is, the guide rollers 36 and 46 are engaged with the side surfaces of the traveling rails 11a and 11b so as to be regulated (see FIG. 5).

  In short, a plurality of saddle frames 30 and 40 are arranged in series along the traveling rails 11a and 11b, and the end portions adjacent to each other of the saddle frames 30 and 40 are vertically connected to the rail tread 11y by the connecting pin member 45 ( It is configured to be rotatable only in the direction (Z direction in FIG. 1), and is restricted so as not to rotate in the left-right direction (Y direction in FIG. 1) orthogonal to the rail tread surface 11y. This movement restriction ensures that the traveling wheels 32 and 42 travel straight (X-direction movement restriction).

  The illustrated wheel unit A is prepared for use in a clean room, and each of the traveling wheels 32a to 32d and 42a to 42d is coated with a synthetic resin such as urethane resin, and the connecting pin member 45 is made of synthetic resin or the like. It is supported by a bush 45v, which is a sliding bearing, so that wear powder such as metal is less likely to be generated.

  Next, the operation of the wheel unit A will be described with reference to FIGS. FIG. 8A shows a case where the left and right traveling rails 11a and 11b are bent by the weight of the transported material acting on the first and second girders 12a and 12b. Although the drawing is exaggerated for ease of explanation, the traveling rail 11 may be distorted in a U shape from the horizontal plane to the lower side due to the weight of the transported object. In this case, the load W1 of the first girder 12a acts on the first saddle frame 30, and the load W2 of the second girder 12b acts on the second saddle frame 40. These loads W1 and W2 are [(transported material weight + trolley weight) / 2 + girder weight] when the mounting position of the hoisting machine (main hoist) 25 is located at the center of both girders, and the loads W1 and W2 are It becomes almost equal. A half of the load W1 acts on the front wheels 32a and 32b of the first saddle frame 30, and the other half acts on the rear wheels 32c and 32d.

  At this time, when one of the front wheels 32a and 32b floats from the rail tread 11y, all loads act on the other. Such an uneven load is the same for all of the front and rear wheels of the first and second saddle frames 30,40. At this time, as shown in FIG. 8B, the wheel unit A of the present invention is displaced so that the first saddle frame 30 and the second saddle frame 40 bend along the rail tread surface 11y around the connecting pin member 45. . As a result, the front wheels, the rear wheels, and all the wheels roll in contact with the traveling rails 11a and 11b in a substantially equal state. Therefore, the load W1 is evenly distributed and supported on the traveling wheels 32a to 32d, and similarly, the load W2 is equally dispersed and supported on the traveling wheels 42a to 42d. Accordingly, since a substantially equal load is applied to the plurality of wheels arranged in tandem on the traveling rail 11, for example, one of the wheels is lifted and a double load is not applied to the adjacent wheels. In addition, each wheel is supported by its axle and rolls smoothly, so that a wheel unit rich in durability can be obtained without causing excessive wear and wear.

  Even when the traveling rail 11 urges upward due to a change in environmental temperature or the like, the traveling wheels 32a to 32d and 42a to 42d are smoothly rolled by the same action as described above as shown in FIG. In addition, straightness along the rail tread surface 11y is obtained, and the meandering property is not inadvertently meandered.

It is an isometric view explanatory drawing of the whole structure of the overhead crane provided with the wheel unit concerning this invention. It is layout explanatory drawing of the running rail in the apparatus of FIG. 1, (a) is a top view, (b) is a front view. It is a structure explanatory drawing of the winding machine in the apparatus of FIG. 1, and a trolley provided with this, (a) is a top view, (b) is an enlarged view of a running wheel. It is a structure explanatory drawing of the winding machine and trolley provided with this in the apparatus of FIG. 1, (a) is a front view, (b) is sectional drawing of a traveling wheel. It is a whole explanatory drawing of the wheel unit (saddle unit) which supports the girder of FIG. 1 to a traveling rail so that position movement is possible. FIG. 6 is an enlarged explanatory view of a main part shown in FIG. 5, (a) is an enlarged view of an I part, (b) is an enlarged view of a II part, and (c) is an enlarged explanatory view of a III part. FIG. 6 is an explanatory diagram of the configuration of the saddle unit in FIG. 5, (a) is an explanatory diagram of a planar state, (b) is an explanatory diagram of a planar configuration of a connecting portion, and (c) is an explanatory diagram of a front configuration of the connecting portion. It is explanatory drawing of the operation state in the apparatus of FIG. 5, (a) is explanatory drawing of a driving | running | working state when a driving rail curves upwards, (b) is an enlarged explanatory view of the principal part. Moreover, (c) is explanatory drawing of a driving | running | working state when a driving rail curves downward, (d) is the principal part expansion explanatory drawing.

Explanation of symbols

A Wheel unit (saddle unit)
B overhead crane 11 traveling rail 11a right traveling rail 11b left traveling rail 11y rail tread 12 girder 12a first girder 12b second girder 20 trolley 15 traversing rail 15a first traversing rail 15b second traversing rail 20a framework frame 21 traveling wheel 22 unit Frame 25 Main winding machine (Main hoist)
26 Auxiliary hoisting machine (sub hoist)
27 Guide roller 30 First saddle frame 40 Second saddle frame 32 (32a to 32d) Traveling wheel 33 Axle 42 (42a to 42d) Traveling wheel 43 Axle 45 Connecting pin member 45v Bush M1 Traverse motor M3 First travel motor M4 Second travel motor

Claims (7)

A wheel unit that moves the hoisting device along a pair of left and right traveling rails arranged at predetermined intervals,
A saddle frame connected to a lifting frame equipped with the hoisting device;
A plurality of traveling wheels supported by the saddle frame;
Driving means for driving the traveling wheels;
With
Each of the saddle frames is composed of a plurality of frame members connected to the lifting frame and having a predetermined length along the traveling rail,
The plurality of frame members are
(1) A plurality of traveling wheels are supported on the front and rear along the traveling rail,
(2) It is arranged so as to be in series along the traveling rail before and after the traveling direction,
(3) End portions adjacent to each other in the front-rear direction are axially connected to the rail tread so as to be rotatable in the vertical direction;
A crane wheel unit characterized by that. The lifting frame is composed of a first lifting frame and a second lifting frame arranged in parallel at a distance in the front and rear direction of the traveling rail,
2. The saddle frame according to claim 1, wherein the saddle frame includes a first frame member connected to the first lifting frame and a second frame member connected to the second lifting frame. The crane wheel unit described in 1. The plurality of frame members are connected in series along the running rail with connecting pin members to shaft holes having substantially the same diameter provided at adjacent ends.
3. The crane wheel unit according to claim 1, wherein the plurality of frame members are connected to a traveling surface of the traveling rail so as to be pivotable in the vertical direction about the connecting pin member. . The plurality of frame members are composed of two first and second frame members connected to each other,
A front row wheel and a rear row wheel are disposed on the first frame member and the second frame member,
4. The first frame motor has a first drive motor connected to the front row wheel, and the second frame member has a second drive motor connected to the last row wheel. The crane wheel unit according to any one of the above. The wheels disposed on the plurality of frame members are subjected to lining such as rubber and synthetic resin on a metal wheel,
A crane wheel unit, wherein a synthetic resin bush is mounted in the shaft hole provided in the plurality of frame members. A pair of left and right traveling rails arranged at predetermined intervals;
Girder erected between the left and right traveling rails;
A trolley that is movable along a traverse rail laid on the girder,
A hoisting device mounted on the trolley;
With
The girder is composed of a first girder and a second girder arranged side by side along the traveling rail,
First and second saddle frames are connected to the first and second girders, respectively.
The first and second saddle frames are
(1) Each is configured in a frame shape having a predetermined length along the traveling rail,
(2) A plurality of wheels are rotatably supported on the front and rear along the traveling rail,
(3) It is arranged so as to be in series along the traveling rail before and after the traveling direction,
(4) The ends adjacent to each other in the front-rear direction are axially connected to the rail tread so as to be rotatable in the vertical direction;
An overhead crane characterized by that. The first saddle frame and the second saddle frame are integrally attached to the first girder and the second girder, respectively, by fixing means such as bolts. Overhead crane.

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