JP2018177039A - Conveyance carrier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a conveyance carrier formed such that work-pieces can be transferred in a stable position and a traveling direction for traveling wheels can be switched to different specific directions, while simplifying a raising/lowering mechanism for work-pieces with respect to a load-carrying platform and also simplifying a raising/lowering mechanism for the load-carrying platform itself.SOLUTION: A conveyance carrier 10 is formed such that work-pieces placed on a load-carrying platform 1 in order to be conveyed can be raised or lowered and such that a traveling direction for traveling wheels 2 of a carrier 4 supported by the load-carrying platform 1 so as to be horizontally rotatable is switchable to different specific directions. The load-carrying platform 1 comprises a jack mechanism 3 in which a plurality of support parts 31 vertically move. Each support part 31 substantially parallelly separates the work-pieces from the load-carrying platform 1. Each support part 31 lowers to substantially parallelly separate the corresponding traveling wheel 2 from a road surface FL.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a carriage that is formed to be capable of moving up and down a workpiece placed and transported on a loading table, and to be switchable in a specific direction in which traveling directions of traveling wheels are different.

  In general, a transport carriage for mounting a long workpiece so as to be able to move up and down and transporting a predetermined section in a factory has formed a long loading platform on which the workpiece is placed and provided many traveling wheels for supporting the loading platform. It becomes a structure. If the traveling wheels of this transport carriage are composed of steerable steering wheels and non-steerable follow-up wheels, the steering mechanism that tends to be a complicated structure can be simplified, but the travel space involved in steering the transport carriage is wide. It is necessary, and factory space is apt to be wasted. Therefore, in order to simplify the steering mechanism of the traveling wheels and reduce waste of the traveling space accompanying the steering, it is possible to lift and lower the work placed and carried on the loading table, and the traveling directions of the traveling wheels are different. A transport carriage formed so as to be switchable in a specific direction is considered, and is described, for example, in Patent Document 1 and Patent Document 2.

  That is, as shown in FIG. 11, in Patent Document 1, a plurality of moving stands 102 are provided with a plurality of wheels 101 rolling on a track fixed in a fixed direction, and a plurality of moving stands 102 on the moving stands. The loading table 104 is swingably supported via the spring 103, the plurality of (three) heavy load lifting jacks 105 supported by the loading table, and the center portion of the transfer rack 102 is perpendicular It is provided in one arrangement and is supported between one gantry lifting jack 106 rotatably supported horizontally in the horizontal direction with respect to the transportation platform, and between the gantry lifting jack 106 and the transportation platform 102 The movable stand 102 is provided with a hydraulic cylinder 107 for swing driving, and the movable stand 102 is moved by extending and retracting the hydraulic cylinder 107 in a state in which the movable stand 102 is raised from the track by the stand lifting jack 106. Direction changing mechanism with heavy transport vehicle 100 comprising so as to be pivoted horizontal direction is disclosed.

  Further, in Patent Document 2, as shown in FIG. 12, the mounting table 201 on which the roll body R is to be mounted and the present roll body conveyance device 200 are moved along a predetermined track provided on the floor. A second wheel group 203 provided on the floor for moving the present roll body conveying device 200 along a path different from the predetermined path, and the present roll body conveying device The wheel lifting means for moving the second wheel group 203 away from the floor when moving along the predetermined track, and the loading stage for changing the distance from the floor of the mounting table 201 at the time of delivery of the roll body R. There is disclosed a roll body transfer apparatus 200 characterized in that the wheel lifting means and the mounting table position adjusting means are realized by the lifting and lowering means sharing the lifting and lowering mechanism 204. .

Unexamined-Japanese-Patent No. 4-100772 JP, 2012-232825, A

  However, in the weight transfer carriage 100 with the direction changing mechanism of Patent Document 1 described above, the plurality of (three) weight lifting jacks 105 supported by the loading table 104 and the vertical arrangement at the central portion of the transfer stand 102. , And it is necessary to redundantly equip the drive mechanism of each jack, since it is provided with one rack-lifting jack 106 rotatably supported in the horizontal direction with respect to the movement rack. There is a problem that leads to increased costs.

  Further, in the above-described heavy-duty transfer carriage 100 with a direction changing mechanism, one platform lifting jack 106 is vertically disposed at the central portion of the transfer platform 102 and can be horizontally rotated with respect to the transfer platform. Since the position of the center of gravity of the heavy load placed on the loading table 104 and the central portion of the moving support 102 are misaligned, the hydraulic cylinder of the support jack 106 is extended. When the loading table 104 is moved, there is a risk that the loading table 104 tilts with respect to the track, and a heavy object may slide down or be misaligned.

  Further, in the roll body conveyance device 200 of Patent Document 2, since the lifting means of the wheel lifting means and the mounting table position adjusting means share the lifting mechanism 204, it is possible to reduce the cost by avoiding duplication of the lifting mechanism. However, since it is not the raising / lowering means to which a roll body is separated from a mounting base, there existed a problem that the transfer means of a roll body needed separately.

  The present invention has been made to solve such a problem, and while simplifying the lifting mechanism of the work relative to the loading platform and the lifting mechanism of the loading platform itself, the work can be transferred with stable posture and traveling An object of the present invention is to provide a transport carriage in which the traveling directions of the wheels can be switched to different specific directions.

In order to achieve the above-mentioned object, the conveyance truck concerning the present invention is provided with the following composition.
(1) A transport which is formed to be capable of moving up and down a workpiece placed and transported on a loading platform, and configured to be switchable in a specific direction in which traveling directions of traveling wheels of a bogie supported horizontally rotatably on the platform are different. It is a dolly,
The loading platform is provided with a jack mechanism in which a plurality of supports move up and down, and the supports rise to separate the work from the loading platform substantially in parallel, and the supports are lowered. The traveling wheels are separated substantially in parallel from the road surface. Here, "the road surface" is meant to include a floor surface or a track on which traveling wheels travel.

  In the present invention, the loading table is provided with a jack mechanism in which a plurality of supporting portions move in the vertical direction, each supporting portion ascends to separate the work from the loading table substantially in parallel, and each supporting portion descends. Since the traveling wheels are separated substantially in parallel from the road surface, the lifting mechanism of the work relative to the loading platform and the lifting mechanism of the loading platform itself can be realized by a common jack mechanism, and the lifting mechanism can be simplified.

In addition, the plurality of support portions of the jack mechanism are elevated to separate the work from the loading table substantially in parallel, for example, the work is stabilized on another support table (for example, a receiving shelf of the processing station) disposed in the gap. Can be transferred in the same posture. In addition, even if, for example, the barycentric position of the work and the central position of the loading platform are different by lowering the plurality of support portions of the jack mechanism and moving the traveling wheels away from the road surface substantially parallel, It is possible to switch the traveling direction of the traveling wheel in different specific directions in a stable posture without tilting with respect to it.

  Therefore, according to the present invention, while simplifying the lifting mechanism of the work with respect to the loading table and the lifting mechanism of the loading table itself, the work can be transferred with a stable posture, and the traveling direction of the traveling wheel is different from the specific direction. It is possible to provide a switchable transport carriage.

(2) In the transport carriage described in (1),
The jack mechanism is characterized by including a lifting drive motor and a transmission member for transferring the rotational force of the lifting drive motor to the plurality of support portions.

  In the present invention, since the jack mechanism includes the elevating drive motor and the transmission member for transmitting the rotational force of the elevating drive motor to the plurality of support portions, the elevation drive motor for the support portion is shared. The lift mechanism can be further simplified. Further, by making the elevating drive motor common, it is possible to equalize the amount of vertical movement in the plurality of support portions that transmit the rotational force of the elevating drive motor by the transmission member. Therefore, the work can be transferred in a stable posture, and the traveling directions of the traveling wheels can be switched to different specific directions in a stable posture.

(3) In the transport carriage described in (2),
A screw jack portion is formed in the vertical direction in the support portion, and the screw jack portion is engaged with a worm gear portion formed in the transmission member.

  In the present invention, since the screw jack portion is formed in the vertical direction in the support portion and the screw jack portion is engaged with the worm gear portion formed in the transmission member, the loading table is lifted even with a small driving force. be able to. Therefore, the elevating drive motor can be miniaturized, and as a result, the jack mechanism can be simplified.

(4) In the transport carriage described in (3),
The lower end portion of the support portion is characterized in that a collar portion which stands up on the outer periphery of a lower contact seat that contacts the road surface is formed.

  In the present invention, the lower end portion of the support portion is formed with the flange portion which stands up on the outer periphery of the lower contact seat that contacts the road surface, so lubricating oil etc. drips from the screw jack portion that moves the support portion up and down. Also, oil splashing on the road surface can be prevented by the buttocks standing on the outer periphery of the lower contact seat. A bellows-like oil scattering prevention cover may be attached around the screw jack portion of the support portion.

(5) In the transport carriage described in any one of (1) to (4),
The jack mechanism moves the support portion to a parking position in contact with the road surface when the transport carriage stops traveling or parks.

  In the present invention, since the jack mechanism moves the support portion to the parking position in contact with the road surface when the transport carriage stops traveling or parks, a bogie braking function is provided to prevent the sudden displacement of the transport carriage. Can. Moreover, when loading a workpiece | work to a conveyance trolley, the trolley | bogie attitude | position control function which prevents an unexpected inclination of a loading platform can also be added. Therefore, the jack mechanism can also be used as a bogie regulating means provided with a bogie braking function, a bogie attitude control function, and the like.

(6) In the transport carriage described in any one of (1) to (5),
The support portion may be disposed at a position adjacent to an outer edge rotational trajectory of the carriage.

  In the present invention, since the support portion is disposed at a position adjacent to the outer edge rotational locus of the carriage, the support portion lifts the loading platform in a more stable posture while supporting the carriage having a heavy weight at the adjacent position. be able to. Therefore, even in the case of a long transport carriage, it is not necessary to increase the rigidity in the longitudinal direction of the loading table more than necessary, and weight reduction of the transport carriage can be achieved. As a result, simplification of the jack mechanism is also achieved. Can.

  According to the present invention, while simplifying the lifting mechanism of the work with respect to the loading table and the lifting mechanism of the loading table itself, it is possible to transfer the work with a stable posture, and to switch the traveling direction of the traveling wheel to different specific directions. It is possible to provide a transport carriage formed on

It is a schematic plan view of a conveyance truck concerning an embodiment of the present invention. It is a schematic side view of the conveyance trolley shown in FIG. FIG. 2 is a detailed plan view of a portion A of the jack mechanism shown in FIG. 1; It is B arrow line view shown in FIG. It is a schematic front view of the conveyance trolley shown in FIG. It is a detailed top view of the trolley shown in FIG. It is C arrow line view shown in FIG. It is DD sectional drawing shown in FIG. It is EE sectional drawing shown in FIG. It is an operation | movement flowchart (an example) of the conveyance trolley shown in FIG. It is a partial longitudinal side view of a heavy-duty conveyance truck with a direction change mechanism described in Patent Literature 1. It is a side view of the roll body conveyance device described in patent documents 2. FIG. (A) is a side view of a roll body conveyance device in a run state. (B) is a side view of the roll body conveyance device in the transverse state. (C) is a side view of a roll body conveyance device in a delivery state.

  Next, a transport carriage according to an embodiment of the present invention will be described in detail with reference to the drawings. Specifically, after describing each configuration of the transport carriage according to the present embodiment, an example of an operation flow of the main transport carriage will be described.

<Structure of this transport carriage>
First, each structure of the conveyance trolley which concerns on this embodiment is demonstrated using FIGS. 1-9. FIG. 1 shows a schematic plan view of a transport carriage according to an embodiment of the present invention. FIG. 2 shows a schematic side view of the transport carriage shown in FIG. FIG. 3 is a detailed plan view of a portion A of the jack mechanism shown in FIG. FIG. 4 shows a view on arrow B shown in FIG. FIG. 5 shows a schematic front view of the transport carriage shown in FIG. FIG. 6 shows a detailed plan view of the carriage shown in FIG. FIG. 7 shows a view in the direction of the arrow C shown in FIG. FIG. 8 is a cross-sectional view taken along the line DD shown in FIG. FIG. 9 shows an E-E cross sectional view shown in FIG.

  As shown in FIGS. 1 to 5, the transport carriage 10 according to the present embodiment is formed so as to be capable of moving up and down the work W to be placed and transported on the loading table 1, and is horizontally rotatably supported by the loading table 1. It is a conveyance trolley formed so as to be switchable in specific directions (for example, front and rear direction and left and right direction shown in FIG. 1) in which traveling directions of traveling wheels 2 of the bogie 4 are different. The main transport carriage 10 travels in a straight line in different specific directions by switching the traveling direction of the traveling wheel 2. Here, the front-rear direction is also referred to as the longitudinal direction of the transport carriage 10, and the left-right direction is also referred to as the width direction of the transport carriage 10.

  In addition, the plurality of (here, 22) supporting portions 31 are provided with the jack mechanism 3 moving in the vertical direction shown in FIG. 2 in the loading table 1, and each supporting portion 31 is lifted to load the work W It separates substantially parallel from 1 and it is comprised so that each support part 31 descend | falls and separates the traveling wheel 2 from the floor surface (road surface) FL substantially parallel. An upper contact seat 317 for contacting the work W is formed at the upper end of each support 31 and the support 31 is raised to separate the work W from the loading stand 1 substantially parallel (work lifting position) Then, the work W can be transferred to the processing station (for example, the receiving rack KS). A lower contact seat 312 is formed at the lower end of each support 31 to abut the floor FL, and each support 31 is lowered to separate the traveling wheels 2 from the floor FL substantially in parallel. The traveling direction of the traveling wheels 2 of the bogie 4 can be switched at (the bogie lifting position). The upper abutment 317 and the lower abutment 312 constitute a flat circular seat.

  In addition, the loading table 1 connects a long frame member long in the front-rear direction and a short frame member short in the left-right direction in a cross-girder shape so that long workpieces W can be loaded, and the outer periphery is the same frame member It is a rectangular frame formed to surround. A storage battery 5 for power supply is accommodated in a double-girder-like space (two places) surrounded by the long frame member and the short frame member. The support portions 31 of the jack mechanism 3 are located at both ends in the left-right direction of the loading table 1 and correspond to the traveling wheels 2 and the storage battery 5 whose weight is heavy, along the longitudinal direction from the front end to the rear end of the loading table 1 It is arranged at approximately equal intervals. The jack mechanism 3 is divided into four in the front-rear direction and arranged symmetrically in the left-right direction. Therefore, the transport carriage 10 is provided with a total of eight jack mechanisms 3. Further, the jack mechanism 3 moves the support portion 31 to a position (parking position) in contact with the floor surface FL when the transport carriage 10 stops traveling or parks, and prevents unintentional transport and inclination of the transport carriage 10 It is also used as a truck control means.

  Each jack mechanism 3 is provided with a lifting drive motor 32 and a transmission member 33 for transferring the rotational force of the lifting drive motor 32 to the plurality of support portions 31. The mounting portion of the lifting drive motor 32 is suspended and fixed below both lateral direction end portions of the loading table 1, and the drive shaft is disposed in the front-rear direction. The drive shaft of the lifting drive motor 32 is connected to a transmission member 33 extending horizontally in the front-rear direction via a shaft connection tool 34. The end of the transmission member 33 opposite to the lifting drive motor 32 is supported by a fixed bearing 36 fixed to the lower end surface 12 of the loading table 1.

  Here, four lifting drive motors 32 are provided on the left and right sides, respectively, and the lifting drive motors 32 are controlled so as to operate in synchronization with each other. When the transport carriage 10 is caused to travel, the upper contact seats 317 of the support portions 31 do not protrude from the upper end surface 11 of the loading table 1 by operating the drive motors 32 for raising and lowering. The respective support portions 31 are moved to a position where the lower contact seat 312 does not abut on the floor surface FL (storage position) or the above-described work lifting position. A non-contact sensor 316 for detecting the vertical position (the work lifting position, the storage position, the parking position, the truck lifting position) of the support portion 31 is provided on the support piece 315 hanging downward from the loading table 1 It is done.

  Further, in the transmission member 33, a worm gear portion 331 is formed at a position intersecting the support portion 31. Further, in the support portion 31, a screw jack portion 311 is formed in the vertical direction, and the screw jack portion 311 is engaged with a worm gear portion 331 formed in the transmission member 33. The screw jack portion 311 and the worm gear portion 331 are engaged in a gear box 35 mounted on the lower end surface 12 of each end of the loading table 1 in the left-right direction. In the support portion 31, a bellows-like oil scattering prevention cover 314 is disposed above and below the gear box 35 so as to surround the screw jack portion 311. Further, at the lower end portion of the support portion 31, in order to prevent oil from splashing on the floor surface FL, a collar portion 313 which stands up on the outer periphery of the lower contact seat 312 is formed.

  Moreover, as shown in FIGS. 6-9, the support part 31 is arrange | positioned in the position adjacent to the outer-edge rotation locus | trajectory of the trolley | bogie 4 supported by the loading platform 1 so that horizontal rotation was possible. Here, a plurality of (for example, four) carriages 4 are installed at substantially equal intervals along the front-rear direction of the transport carriage 10 (see FIGS. 1 and 2). Further, the carriage 4 supports a wheel frame member 41 for pivotally supporting an axle 21 which connects left and right traveling wheels 2 disposed to the front and rear, an annular member for supporting the wheel frame member 41 and the loading table 1 in a horizontally rotatable manner. A rolling member 42, a rotation drive motor 43 for rotating the outer ring 421 of the annular rolling member 42, and a lock device 44 engaged with the loading table 1 to fix the traveling direction of the traveling wheel 2 in different specific directions Have. At the front and rear of the wheel frame member 41, a traveling drive motor 22 connected via a gear portion 23 engaged with the axle 21 is disposed.

  Further, the rotation drive motor 43 is fixed to the wheel frame member 41. The outer ring 421 of the annular rolling member 42 is fixed to the loading table 1, and the inner ring 422 of the annular rolling member 42 is fixed to the wheel frame member 41. The pinion teeth 432 are attached to the drive shaft of the rotation drive motor 43, and the pinion teeth 432 are engaged with ring-shaped rack teeth formed on the outer periphery of the outer ring 421. The outer ring 421 and the inner ring 422 are connected via a ball bearing 423. When the rotation drive motor 43 operates, the pinion teeth 432 rotate in a predetermined direction, and the outer ring 421 rotates with the rotation of the pinion teeth 432, and the traveling direction of the traveling wheel 2 axially supported by the wheel frame member 41 Can be switched.

  In addition, two direction detection switches 451 and 453 for detecting the traveling direction of the traveling wheel 2 are mounted on the loading table 1 at different positions. The wheel frame member 41 includes a first detection block 452 that contacts one of the direction detection switches 451 during normal travel in which the traveling direction of the traveling wheel 2 is the front-rear direction of the transport carriage 10, and the traveling direction of the traveling wheel 2 The second detection target block 454 which is in contact with the other direction detection switch 453 when the transport carriage 10 is turned by 90 degrees in the left-right direction is mounted at a different position. In response to the outputs from the direction detection switches 451 and 453, the rotation drive motor 43 operates and stops.

  Further, the lock device 44 is fixed to the wheel frame member 41. The lock device 44 includes an electric cylinder 441 capable of expanding and contracting in the vertical direction, a cylindrical lock pin 442 connected to a rod portion of the electric cylinder 441, and a bush portion 443 fixed to the loading table 1 and engaged with and disengaged from the lock pin 442 Is equipped. The electric cylinder 441 extends and locks during normal travel when the traveling direction of the traveling wheel 2 is the front-rear direction of the transport carriage 10 and when the traveling direction of the traveling wheel 2 is 90 degrees turn when the transport direction of the transport carriage 10 is the left-right direction The pin 442 engages with the bush 443. By this, the transport carriage 10 can travel linearly in different specific directions.

<Operation flow of this transport carriage>
Next, an example of the operation flow of the transport carriage will be described with reference to FIG. FIG. 10 shows an operation flow diagram (an example) of the transport carriage shown in FIG. In this example, a long workpiece W, which is a fired part, is loaded on the loading table 1 at a work loading station in the factory, switched in the traveling direction at an intermediate position on the way, and transported to the processing station , Is an example of returning to the work loading station with an empty load.

  As shown in FIG. 10, first, the work W is loaded on the loading table 1 at the work loading station, and the transport carriage 10 is moved to an intermediate position where the traveling direction of the traveling wheel 2 is switched (step: S1). The workpiece W is loaded such that the longitudinal direction thereof coincides with the front-rear direction of the loading table 1. When the transport carriage 10 is moved from the work loading station to the intermediate position, the traveling direction of the traveling wheel 2 is fixed by the lock device 44 in the left-right direction (when turning 90 degrees).

  Next, after stopping the transport carriage 10 at an intermediate position, the support portion 31 of the jack mechanism 3 is lowered to the carriage lifting position to separate the traveling wheel 2 from the floor surface FL (step S2). Thereafter, the lock pin 442 of the carriage 4 is lowered to release the engagement with the bush portion 443, and then the traveling direction of all the traveling wheels 2 is switched in the front-rear direction (during normal traveling). It ascends and engages with the bush 443 (step: S3).

  Next, the support portion 31 of the jack mechanism 3 is raised to the storage position, the traveling wheel 2 grounded to the floor surface FL is operated, and the transport carriage 10 is moved to the front of the processing station (baking furnace) (step S4) . Then, after stopping the transport carriage 10 in front of the processing station, the support portion 31 of the jack mechanism 3 is raised to separate the work W from the loading table 1 substantially in parallel (step: S5).

  Next, the traveling wheel 2 is operated to move the transport carriage 10 forward into the processing station, and the receiving rack KS is inserted into the gap between the work W and the loading table 1 (step: S6). The receiving racks KS are disposed on both the left and right sides of the transport carriage 10 so as not to interfere with the support portion 31 of the jack mechanism 3 (see FIG. 5). Thereafter, the support portion 31 of the jack mechanism 3 is lowered to the storage position, and the work W is transferred to the receiving rack KS of the processing station (step: S7).

  Next, the transport carriage 10, which has become empty, is retracted and moved to an intermediate position (step: S8). The traveling direction of the traveling wheel 2 at this time is the front-rear direction of the transport carriage 10 (during normal traveling). Next, after the transport carriage 10 is stopped at the intermediate position, the support portion 31 of the jack mechanism 3 is lowered to the carriage lifting position to separate the traveling wheel 2 from the floor surface FL (step: S9). Thereafter, after the lock pin 442 of the carriage 4 is lowered to release the engagement with the bush portion 443, the traveling direction of all the traveling wheels 2 is switched to the left and right direction (when turning 90 degrees). To engage with the bush portion 443 (step: S10).

  Next, the support portion 31 of the jack mechanism 3 is raised to the storage position, and the transport carriage 10 is moved from the intermediate position to the work loading station (step S11). After the scheduled work W has been conveyed, the support portion 31 of the jack mechanism 3 is lowered to the parking position in contact with the floor surface FL. As described above, the transport carriage 10 can transfer the work W in a stable posture while simplifying the lifting mechanism of the work W relative to the loading stand 1 and the lifting mechanism of the loading stand 1 itself, and in a stable posture. The traveling direction of the traveling wheel 2 can be switched to a different specific direction.

<Function effect>
As described above, according to the transport carriage 10 according to the present embodiment described in detail, the loading table 1 includes the jack mechanism 3 in which the plurality of support portions 31 move in the vertical direction, and each support portion 31 is lifted to work Since W is separated from the loading table 1 substantially in parallel, and each support portion 31 is lowered to separate the traveling wheel 2 from the floor surface (road surface) in substantially parallel, the lifting mechanism of the work W relative to the loading table 1 and the loading table The lifting mechanism 1 itself can be realized by the common jack mechanism 3, and the lifting mechanism can be simplified.

  In addition, when the plurality of support portions 31 of the jack mechanism 3 are lifted to separate the work W from the loading table 1 substantially in parallel, for example, another table (for example, the receiving shelf KS of the processing station) disposed in the gap. Can be transferred in a stable attitude. Further, for example, the center of gravity position of the work W and the central position of the loading table 1 are obtained by lowering the plurality of support portions 31 of the jack mechanism 3 and separating the traveling wheel 2 substantially parallel from the floor surface (road surface) FL. Even when there is a difference, the traveling direction of the traveling wheel 2 can be switched to a different specific direction in a stable posture without the loading table 1 being inclined with respect to the floor surface (road surface) FL.

  Therefore, according to the present embodiment, the work W can be transferred with a stable posture and the traveling wheel 2 travels while simplifying the lifting mechanism of the work W relative to the loading table 1 and the lifting mechanism of the loading table 1 itself. It is possible to provide a transport carriage 10 formed so as to be switchable in different specific directions.

  Further, according to the present embodiment, since the jack mechanism 3 includes the elevating drive motor 32 and the transmission member 33 for transmitting the rotational force of the elevating drive motor 32 to the plurality of support portions 31, the support is supported. The lifting drive motor 32 for the unit 31 can be made common, and the lifting mechanism can be further simplified. Further, by making the elevating drive motor 32 in common, it is possible to equalize the amount of vertical movement in the plurality of support portions 31 which transmit the rotational force of the elevating drive motor 32 by the transmission member 33. Therefore, the workpiece W can be transferred in a stable posture, and the traveling directions of the traveling wheels 2 can be switched to different specific directions in a stable posture.

  Further, according to the present embodiment, since the screw jack portion 311 is formed in the vertical direction in the support portion 31 and the screw jack portion 311 is engaged with the worm gear portion 331 formed in the transmission member 33, The loading table 1 can be lifted even with a small driving force. Therefore, the elevating drive motor 32 can be miniaturized, and as a result, the jack mechanism 3 can be simplified.

  Further, according to the present embodiment, the lower end portion of the support portion 31 is formed with the collar portion 313 which stands up on the outer periphery of the lower contact seat 312 in contact with the floor surface (road surface) FL. Even if lubricating oil or the like is dripped from the screw jack portion 311 to be moved, oil splashing to the floor surface FL can be prevented by the flange portion 313 standing on the outer periphery of the lower contact seat 312. In addition, scattering of lubricating oil etc. can also be further reduced by mounting the bellows-like oil scattering prevention cover 314 around the screw jack part 311 of the support part 31. FIG.

  Further, according to the present embodiment, the jack mechanism 3 moves the support portion 31 to the parking position in contact with the floor surface FL when the transport carriage 10 stops traveling or parks, so the transport carriage 10 unexpectedly moves Truck braking function can be added to prevent. Moreover, when loading the workpiece | work W on the conveyance trolley 10, the trolley | bogie attitude | position control function which prevents an unexpected inclination of the loading platform 1 can also be added. Therefore, the jack mechanism 3 can also be used as a bogie regulating means provided with a bogie braking function, a bogie attitude control function, and the like.

  Further, according to the present embodiment, since the support portion 31 is disposed at a position adjacent to the outer edge rotational locus of the carriage 4, the load is applied while the support portion 31 supports the carriage 4 with heavy weight at the adjacent position. The platform 1 can be lifted in a more stable posture. Therefore, even in the case of the long transport carriage 10, it is not necessary to increase the rigidity in the longitudinal direction of the loading table 1 more than necessary, and weight reduction of the transport carriage 10 can be achieved. As a result, the jack mechanism 3 can be simplified. Can also be implemented.

<Modification>
As mentioned above, although the conveyance trolley 10 of this embodiment was demonstrated in detail, this invention is not limited to this, A various change is possible in the range which does not deviate from the meaning. For example, in the present embodiment, although the traveling wheel 2 travels on the floor surface, it goes without saying that the traveling wheel 2 may travel on a track installed on the floor surface. Moreover, although the jack mechanism 3 is divided and installed in plurality, you may comprise the whole or one part (for example, right side and left side of a conveyance trolley) integrally. Furthermore, the transmission member 33 is a member that is connected to the drive shaft of the elevating drive motor 32 via the shaft coupling tool 34 and extends horizontally in the longitudinal direction, but may be a transmission member made of a chain or the like. .

  Industrial Applicability The present invention can be used as a transport carriage which is formed to be capable of moving up and down a workpiece placed and transported on a loading platform and switchable to specific directions in which traveling directions of traveling wheels are different.

DESCRIPTION OF SYMBOLS 1 loading platform 2 traveling wheel 3 jack mechanism 4 carriage 10 conveyance cart 31 support part 32 raising / lowering drive motor 33 transmission member 311 screw jack part 312 lower contact seat 313 collar part 331 worm gear part FL floor surface (road surface)
W work

Claims (6)

A carriage configured to be capable of moving up and down a workpiece placed and transported on a loading platform, and configured to be switchable in a specific direction in which traveling directions of traveling wheels of the carriage supported horizontally rotatably on the loading platform are different. ,
The loading platform is provided with a jack mechanism in which a plurality of supports move up and down, and the supports rise to separate the work from the loading platform substantially in parallel, and the supports are lowered. A transport truck characterized by separating the traveling wheels from a road surface substantially in parallel. In the transport carriage according to claim 1,
The transport carriage according to claim 1, wherein the jack mechanism includes a lifting drive motor and a transfer member for transferring the rotational force of the lifting drive motor to the plurality of support portions. In the transport carriage according to claim 2,
And a screw jack portion is vertically formed in the support portion, and the screw jack portion is engaged with a worm gear portion formed in the transmission member. In the transport carriage according to claim 3,
A transport carriage characterized in that a lower end portion of the support portion is formed with a hook portion which stands up on an outer periphery of a lower contact seat that contacts the road surface. The transport carriage according to any one of claims 1 to 4.
The said jack mechanism moves the said support part to the parking position contact | abutted with a road surface, when the said conveyance trolley stops a driving | running | working or parks, The conveyance trolley characterized by the above-mentioned. The transport carriage according to any one of claims 1 to 5.
The transport truck according to claim 1, wherein the support portion is disposed at a position adjacent to an outer edge rotation trajectory of the truck.

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