JP2009256023A - Lifting truck - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lifting truck, in which a lifting base can be smoothly moved up/down, regardless of assembly accuracy a screw shaft or tilting thereof caused by deformation. <P>SOLUTION: The lifting truck 1 comprises: a truck 10 moving along a floor surface; and a lifting device 20 installed on the truck 10 and making the lifting base 21 move up/down in the Z-direction with respect to the floor surface. The lifting device 20 comprises: frame pillar members 31 standing on the truck 10; bass screws disposed in the frame pillar members 31, extending in the Z-direction, and capable of axially rotating forward/reversely; lifting drive parts 36 rotary driving the ball screws forward/reversely; four pillar parts 30 screwed with the ball screws, moved along the frame pillar members 31 by the rotary drive of the ball screws, and having nut blocks connected to the lifting base 21; and connecting parts 70 connecting the nut blocks with the lifting base 21 to be relatively rotatable around a predetermined shaft. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an elevator car, and more particularly to an elevator car used in an automatic warehouse such as a clean room.

An elevator truck used in an automatic warehouse is required to have the ability to operate continuously for 24 hours 365 days. In general, as an elevator car used in such an automatic warehouse, an elevator car that elevates the elevator by hanging the elevator with a wire and winding the wire through a wire guide sheave is known (for example, Patent Document 1).
However, the life of the wire is shorter than that of the lifting carriage main body, and the life of the wire is present, for example, when it is bent several hundred thousand times, and the wire constituting the wire is always cut. Therefore, the lifting cart using wires requires maintenance for stopping the lifting cart for a long time for periodic inspection of the wires and replacement of the wires, and it has been difficult to operate continuously in the automatic warehouse for a long time. Furthermore, there is a risk that dust generated by sliding between the wire and the wire guide sheave may fall on the load. Therefore, it is necessary to take measures against dust generation such as covering the sliding part that generates dust in a clean room that handles precision parts. There is a problem of becoming.

2. Description of the Related Art Conventionally, lift trucks for automatic warehouses described in Patent Document 2 and Patent Document 3 are known as lift trucks that raise and lower a lift base without using the wires having the above-described problems. The elevator carriage is configured to raise and lower the elevator platform by rotationally driving a screw shaft. The screw shaft has a longer life than a wire and can be designed according to the life of the lifting car body, so there is less need for maintenance such as replacement. Furthermore, the screw shaft is suitable for operation in a clean room because it generates less dust than a wire and can suppress vibration and noise.
JP 2001-302186 A JP 2002-114496 A JP 2004-43105 A

By the way, when a screw shaft is used for raising and lowering the lifting platform, there is a problem that it is difficult to ensure a lifting stroke of the lifting platform as compared to the case of using a wire. That is, when the screw shaft is used, it is not configured to pull up the lifting platform using a wire. Therefore, in order to position the lifting platform at a predetermined height, the length of the screw shaft body is structurally set to the predetermined height. The length corresponding to the length must be increased.
However, as the length of the screw shaft increases, it becomes difficult to keep the assembly accuracy (tilt) in the vertical direction of the floor of the screw shaft within a predetermined allowable range, and the lifting platform moves smoothly along the screw shaft. There is a risk of affecting. In addition, as the length of the screw shaft is increased, the screw shaft is likely to be bent.For example, when a heavy object is placed on the lifting platform, the screw shaft supporting the lifting platform is subjected to a load and is deformed and tilted. There is a risk of hindering the smooth lifting movement of the lifting platform.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an elevating carriage that enables smooth elevating movement of the elevating platform regardless of assembly accuracy and inclination of the screw shaft due to deformation. . Another object is to provide a lifting carriage suitable for operation in a clean room.

In order to solve the above-described problems, the present invention includes a carriage that moves along a floor surface, and an elevating device that is installed on the carriage and that allows the elevator platform to move up and down in a direction perpendicular to the floor surface. The lifting device includes a frame pillar member erected on the carriage, a screw shaft provided in the frame pillar member and capable of rotating forward and backward around an axis extending in the vertical direction, A drive unit that drives the screw shaft to rotate forward and backward, and a movable unit that is screwed to the screw shaft and moves along the frame column member by the rotational drive of the screw shaft, and is connected to the lifting platform. It has a plurality of column parts provided, and adopts a configuration comprising a connecting part that connects the movable part and the lifting platform so as to be relatively rotatable around a predetermined axis.
By adopting such a configuration, in the present invention, since the movable portion and the lifting platform can be relatively rotated, even if the screw shaft is tilted, the connecting portion operates according to the tilt, Tilt is absorbed.

Moreover, in this invention, the structure that the said connection part has a spherical bearing is employ | adopted.
By adopting such a configuration, in the present invention, since the movable part and the lifting platform can be relatively rotated in a desired direction, the connecting part absorbs the inclination regardless of the direction in which the screw shaft is inclined. be able to.

In the present invention, the column part and the connecting part are provided on both sides of the lifting platform in a predetermined direction, and the one connecting part in the predetermined direction is rotatably connected to the movable part and the lifting / lowering part. The structure which has the connection member rotatably provided in the stand is employ | adopted.
By adopting such a configuration, in the present invention, by providing a connecting member, a rotatable structure is added and a larger inclination is absorbed. Further, by providing the connecting member only on one side, it is possible to suppress the swinging of the lifting platform due to excessive degrees of freedom and to stabilize the lifting platform.

Moreover, in this invention, the structure that the said drive part is provided below the surface which mounts a load on the said raising / lowering stand is employ | adopted.
By employ | adopting such a structure, in this invention, it can suppress that the dust generation of a drive part adheres to the load loaded on a lifting platform.

In the present invention, the frame column member is formed with an opening along the moving path of the movable part, and the shield covers and covers the opening in an area other than the area corresponding to the position of the movable part. A configuration in which members are provided is employed.
By adopting such a configuration, in the present invention, it is possible to prevent the dust generated from the screw shaft or the like provided inside the frame column member from flowing out to the outside.

Moreover, in this invention, the structure of having an air-conditioning part which flows the air inside the said frame pillar member out of the said frame pillar member through a dust collection filter is employ | adopted.
By adopting such a configuration, in the present invention, the air in the frame column member is allowed to flow out through the dust collection filter, whereby the air can be discharged while removing the dust with the dust collection filter.

Moreover, in this invention, the structure that the transfer apparatus which transfers a load between the transfer object parts is provided in the said lifting stand is employ | adopted.
By adopting such a configuration, in the present invention, it is possible to transfer a load to and from the transfer target unit.

According to the present invention, in order to solve the above-described problems, the present invention includes a cart that moves along a floor surface, and a lift that can be moved up and down in a direction perpendicular to the floor surface. A lifting carriage that includes a frame pillar member that is erected on the carriage, and a forward and reverse rotation about an axis that is provided in the frame pillar member and extends in the vertical direction. A flexible screw shaft, a drive unit that drives the screw shaft to rotate forward and reverse, and screwed to the screw shaft, moved along the frame column member by the rotational drive of the screw shaft, and connected to the lifting platform Movable by adopting a configuration that includes a plurality of column parts including a movable part, and a coupling part that rotatably couples the movable part and the lift base around a predetermined axis. The screw shaft is tilted Even, the connecting portion is operated in response to the inclination, the inclination is absorbed.
Therefore, the present invention can absorb the assembly accuracy of the screw shaft and the inclination due to the deformation at the connecting portion between the movable portion and the lifting platform, so that the lifting platform can be smoothly moved up and down.

Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view of a lifting carriage 1 according to an embodiment of the present invention.
FIG. 2 is a right side view of the lifting carriage 1 in the embodiment of the present invention.
FIG. 3 is a plan view of the lifting carriage 1 in the embodiment of the present invention.
The elevator cart 1 is used in an automatic warehouse, particularly in a clean room, and is provided on a pair of rails 2 laid on the floor surface of the automatic warehouse. As shown in FIGS. 1 and 2, the lifting carriage 1 having such a configuration includes a carriage 10 that is movable along a pair of rails 2, a lifting device 20 that is installed on the carriage 10, and a lifting carriage 1. It has a configuration having a control unit 5 that comprehensively controls the entire drive. The elevating carriage 1 of this embodiment is a large-sized one that conveys a large transported object (luggage) H (about 2 tons), and has a total length of 5 m.
In the following description, the length direction of the lifting carriage 1 may be described as the X direction, the width direction as the Y direction, and the height direction as the Z direction.

  As shown in FIG. 3, the carriage 10 has a base 11 having a rectangular shape in plan view, and can be rotated around an axis extending in the Y direction on the rail 2 at four corners on both sides of the base 11 in the Y direction. Each wheel 12 is provided. Each of the wheels 12 is connected to a traveling motor 13 provided on the carriage 10 and is configured to rotate in synchronization with the driving of the traveling motor 13. Therefore, the carriage 10 is movable along the rail 2 by driving the traveling motor 13.

As shown in FIG. 1, the elevating device 20 is configured to elevate and lower an elevating table 21 on which a conveyed product H is placed in a vertical direction (Z direction) with respect to the floor surface. It has a column part 30. As shown in FIG. 3, two column portions 30 are provided symmetrically on both sides of the lifting platform 21 in the X direction (predetermined direction), and the four corners of the lifting platform 21 are respectively connected via connecting portions 70 (described later). Connected.
Further, in the vicinity of each column portion 30, auxiliary column portions 50 that are arranged in parallel in the X direction and extend in the Z direction are provided. The auxiliary column portion 50 is configured to be connected to the side surface of the column portion 30 at a plurality of locations in order to keep the assembly accuracy of the column portion 30 in the Z direction within an allowable range (suppress the inclination of the column portion 30 with respect to the Z direction). ing. Further, as shown in FIG. 2, the column parts 30 are connected to each other in the Y direction by a beam member 51 (not shown in FIG. 3).
A fork device (transfer device) 40 is provided at the center of the lifting platform 21, and the fork device 40 extends in the -Y direction to move to a transfer target portion such as a storage shelf (not shown). It is the structure which can deliver the conveyed product H freely between.

Next, the configuration of the column part 30 will be described with reference to FIGS. 4 and 5.
FIG. 4 is a cross-sectional view taken along line AA of the column portion 30 shown in FIG.
5 is a cross-sectional view taken along line B-B of the column portion 30 shown in FIG.
As shown in FIGS. 4 and 5, the column portion 30 includes a frame column member 31 erected on the carriage 10 and a ball that is provided in the frame column member 31 and can rotate forward and backward around an axis extending in the Z direction. A screw (screw shaft) 35, an elevating drive unit (drive unit) 36 that drives the ball screw 35 to rotate forward and backward, and a ball screw 35, and is moved along the frame column member 31 by the rotational drive of the ball screw 35. At the same time, a nut block (movable part) 37 connected to the lift 21, a clean belt (shield member) 60 provided in the frame column member 31, and a filter unit (air conditioner) provided on the side surface of the frame column member 31 Part) 61.

The frame column member 31 is a column member extending in the Z direction, and is formed in a substantially rectangular frame shape in plan view as shown in FIG. On both inner side surfaces of the frame column member 31 in the X direction, there are provided guide portions 32 protruding inward by a predetermined amount and extending linearly in the Z direction.
The frame column member 31 has an opening 33 extending in the Z direction at the center of the side surface in the −Y direction. On the other hand, a plurality of circular vent holes 34 are formed on the side surface in the + Y direction of the frame column member 31 so as to be spaced apart at a constant interval in the Z direction (see FIG. 5).

The ball screw 35 is disposed in the center of the frame column member 31 and is erected in the Z direction. A rolling groove of a rolling element such as a ball is spirally formed on the peripheral surface of the ball screw 35. An elevating mechanism 36a is connected to the base end of the ball screw 35, and the ball screw 35 is rotatable forward and backward about an axis extending in the Z direction by the elevating mechanism 36a.
The raising / lowering drive part 36 has the structure which has the raising / lowering mechanism 36a and the raising / lowering motor 36b (refer FIG. 3) which supplies a driving force to the raising / lowering mechanism 36a. As shown in FIG. 1, the lifting drive unit 36 is installed on the base 11 and below the surface on which the transported object H is placed on the lifting base 21 (in this embodiment, the fork device 40 is placed). Located below the surface). Therefore, even if the elevating drive unit 36 is driven to generate dust, the generated dust is generated below the elevating platform 21 and is prevented from adhering to the transported object H placed on the elevating platform 21. It has a configuration that can.

As shown in FIG. 4, the nut block 37 is disposed inside the frame column member 31, has a plurality of rolling elements (not shown), and is screwed to the ball screw 35 via the rolling elements. A plurality of free rollers 38 that sandwich the guide portion 32 in the Y direction are provided on both side surfaces of the nut block 37 in the X direction. The free roller 38 is provided to be rotatable around an axis extending in the X direction.
In addition, on the side surface of the nut block 37 in the −Y direction, a convex portion 39 that protrudes to the outside of the frame column member 31 through the opening 33 is provided. At the base of the convex portion 39, there are provided a through-hole 39a having a rectangular shape in plan view that penetrates in the Z direction, and a free roller 39b that guides the clean belt 60 to the through-hole 39a. The nut block 37 having such a configuration is movable in the Z-direction inside the frame column member 31 by the rotation drive of the ball screw 35 and the action of the guide portion 32, and the convex portion 39 is accompanied by the movement. It moves along the opening 33.

  The clean belt 60 is a belt-like belt provided over the entire length of the frame column member 31 that covers and closes the opening 33 in a region other than the region corresponding to the position of the nut block 37 (the region where the convex portion 39 protrudes). is there. As shown in FIG. 5, the clean belt 60 is configured to be guided through a free roller 39 b into the through-opening 39 a of the convex portion 39 in a region where the convex portion 39 projects. As a result, the clean belt 60 suppresses outflow of dust generated from the ball screw 35 or the like provided in the frame column member 31 or the like to the outside of the frame column member 31 through the opening 33. In addition, the clean room is prevented from being contaminated.

  The filter unit 61 is provided in each part of the frame column member 31 where the vent holes 34 are formed, and includes a dust collection filter 63 and a fan 62. The filter unit 61 is configured to cause the air inside the frame column member 31 to flow out of the frame column member 31 through the dust collection filter 63 by driving the fan 62. As a result, the filter unit 61 places the inside of the frame column member 31 in a negative pressure state, smoothly moves the nut block 37, and flows an air flow path that leads from the gap between the opening 33 and the clean belt 60 to the vent hole 34. A structure that prevents contamination of the clean room by removing dust generated from the ball screw 35 or the like mixed in the air or by splashing the lubricating oil with the dust collecting filter 63 and ventilating the air by actively forming the air. It has become.

Next, with reference to FIG.6 and FIG.7, the connection part 70 which connects the nut block 37 and the raising / lowering stand 21 is demonstrated. The connection part 70 in this embodiment differs in a structure by the -X direction side and the + X direction side.
6 is a partial enlarged cross-sectional view taken along the line CC in FIG. 1 showing the configuration of the connecting portion 70a on the −X direction side.
FIG. 7 is a partial enlarged cross-sectional view taken along line B-B in FIG.

First, the configuration of the connecting portion 70a on the −X direction side will be described with reference to FIG.
The connection part 70a is arrange | positioned between the nut block 37 and the lifting platform 21, and connects the nut block 37 and the lifting platform 21 so that rotation is relatively possible. Such a connecting portion 70 a is composed of a spherical bearing 71 provided between the tip end portion of the convex portion 39 and the frame 21 a fixed to the lifting platform 21.

The spherical bearing 71 includes an inner ring 72 having a convex spherical outer surface 72s and an outer ring 73 having a concave spherical inner surface 73s, and the convex spherical outer surface 72s and the concave spherical inner surface 73s are slidably fitted to each other, thereby The outer ring 73 is held so as to be rotatable in any direction with respect to 72. The inner ring 72 of the spherical bearing 71 is fixed to the convex portion 39, while the outer ring 73 of the spherical bearing 71 is fixed to the frame 21a.
Thus, the spherical bearing 71 is configured to support the elevator 21 via the frame 21a so as to be rotatable about the axis extending in the X, Y, and Z directions with respect to the convex portion 39 and the nut block 37. .

Next, the configuration of the connecting portion 70b on the + X direction side will be described with reference to FIG.
The connection part 70b is arrange | positioned between the nut block 37 and the lifting platform 21, and connects the nut block 37 and the lifting platform 21 so that rotation is relatively possible. The connecting portion 70 b includes a spherical bearing 71 and a connecting frame (connecting member) 75.
The spherical bearing 71 on the + X direction side has the same configuration as the spherical bearing 71 provided on the −X direction side, and is provided between the distal end portion of the convex portion 39 and one end portion of the connecting frame 75. The inner ring 72 of the spherical bearing 71 is fixed to the convex portion 39, while the outer ring 73 of the spherical bearing 71 is fixed to the connecting frame 75. Accordingly, the spherical bearing 71 is configured to support the connecting frame 75 so as to be rotatable about the axis extending in the X, Y, and Z directions with respect to the convex portion 39 and the nut block 37.
One end of the connection frame 75 is connected to the convex portion 39 via the spherical bearing 71, and the other end is connected to the frame 21 b via the shaft portion 76. The shaft portion 76 allows the frame 21b and thus the lifting platform 21 to rotate about the axis extending in the Y direction at the other end, and the outer ring is fixed to the connecting frame 75 and the inner ring is fixed to the shaft portion 21b1 of the frame 21b. It becomes the composition which is done.

Next, the operation of the lifting carriage 1 having the above configuration and the operation of the connecting portion 70 will be described with reference to FIG.
FIG. 8 is a diagram for explaining the operation of the connecting portion 70 in the embodiment of the present invention.
First, the operation of the lifting carriage 1 will be described.
The lift carriage 1 on which the transported object H is placed on the lift 21 is driven under the control of the control unit 5 shown in FIG. 1 to move the travel motor 13 freely in the X direction and stop at a predetermined position. In order to position the conveyed product H at a predetermined height, the lifting device 20 is driven.

The control unit 5 drives the elevating drive unit 36 to synchronously drive the ball screws 35 provided on the respective column units 30 (see FIGS. 3 and 5). When the ball screw 35 is rotationally driven, the nut block 37 moves in the Z direction along the guide portion 32. As the nut block 37 moves, the elevator 21 connected to the convex portion 39 of the nut block 37 via the connecting portion 70 moves accordingly.
At this time, the ball screw 35 and the entire column portion 30 are inclined with respect to the Z direction according to the weight of the conveyed product H as shown in FIG. In the present embodiment, the column part 30 on the −X direction side is inclined toward the + X direction side, and the column part 30 on the + X direction side is inclined toward the −X direction side.

  As described above, when the ball screw 35 and thus the entire column portion 30 are inclined with respect to the Z direction due to the influence of the weight of the conveyed product H and the influence of the assembly accuracy due to the installation of the large ball screw 35, the inclination of the ball screw 35 is inclined. Accordingly, the connecting portion 70 mechanically absorbs the inclination by rotating the nut block 37 and the lifting platform 21 relatively in an arbitrary direction.

For example, as shown in FIG. 8, when the column part 30 on the −X direction side is inclined to the + X direction side, the nut block 37 and the lifting platform 21 are caused by the action of the spherical bearing 71 provided in the connecting part 70 a. Is relatively rotated around the Y direction to mechanically absorb the inclination.
Further, as shown in FIG. 8, when the + X direction column 30 is inclined to the −X direction, the nut block 37 and the connection frame 75 are caused by the action of the spherical bearing 71 provided in the connection 70b. Are slightly rotated around the Y direction. Further, the connecting portion 70b mechanically absorbs the inclination by rotating the connecting frame 75 and the elevator 21 relatively slightly around the Y direction by the action of the shaft portion 76 provided on the connecting frame 75. In addition, a mechanical relief is formed in the X direction.
In addition, there exists an effect | action which reduces the excessive rocking | fluctuation of the lifting / lowering base 21 in the X direction by forming the said mechanical escape by making the structure of the connection part 70 into the connection part 70a and the connection part 70b. . That is, when the + X direction side and −X direction side connecting portions 70 are configured by the connecting portion 70b, the degree of freedom increases mechanically due to the action of the connecting frame 75, so that the lifting platform 21 swings in the X direction. Although it becomes easy to move, the structure of the connecting part 70 is made different between the connecting part 70a and the connecting part 70b, so that the inclination is absorbed and excessive swinging of the lifting platform 21 is suppressed, and the conveyed product H is stabilized. Can be moved up and down.

  Thus, even when the ball screw 35 and thus the entire column portion 30 are inclined and the relative position between the nut block 37 and the lifting platform 21 is changed, the four connecting portions 70 connected to the lifting platform 21 at the four corners. Acts to relatively rotate the nut block 37 and the lifting platform 21. That is, the connecting part 70 mechanically absorbs the inclination, so that the vertical movement of the lifting platform 21 in the Z direction is maintained.

Therefore, according to the above-described embodiment, the carriage 10 that moves along the floor surface, and the lifting device 20 that is installed on the carriage 10 and that allows the lifting platform 21 to move up and down in the Z direction with respect to the floor surface; The lifting device 20 includes a frame column member 31 erected on the vehicle 10 and a ball screw provided in the frame column member 31 and capable of rotating forward and backward around an axis extending in the Z direction. 35, an elevating drive unit 36 for driving the ball screw 35 to rotate forward and backward, and screwed to the ball screw 35, and moved along the frame column member 31 by the rotational drive of the ball screw 35 and coupled to the elevating platform 21. A configuration in which four pillar portions 30 including a nut block 37 are provided, and a connecting portion 70 is provided that connects the nut block 37 and the lifting platform 21 so as to be relatively rotatable around a predetermined axis. By the nut Since the lock 37 and the lifting platform 21 is relatively rotatable, even inclined entire ball screw 35 and thus the bar portion 30, connecting portion 70 is operated in response to the inclination, the inclination is absorbed.
Therefore, in this embodiment, since the assembly accuracy of the ball screw 35 and the inclination due to deformation can be mechanically absorbed by the connecting portion 70 that connects the nut block 37 and the lifting platform 21, the lifting platform 21 can be smoothly moved up and down. There is an effect that can be made possible.

  In the present embodiment, the connecting portion 70 has a spherical bearing 71, so that the nut block 37 and the lifting platform 21 can be relatively rotated in any direction, and the ball screw 35 is inclined. The connecting portion 70 can absorb the inclination regardless of the direction.

  In the present embodiment, the column part 30 and the connecting part 70 are provided on both sides in the X direction of the lifting platform 21, and the connecting part 70 b on the + X direction side is rotatably connected to the convex part 39 of the nut block 37. In addition, by adopting a configuration in which the connection frame 75 is rotatably provided on the elevator 21, the inclination can be absorbed and a mechanical relief can be formed. In addition, by providing the connection frame 75 only on the + X direction side, it is possible to suppress the swinging of the lifting platform 21 due to excessive degrees of freedom and to stabilize the lifting platform 21.

  Moreover, in this embodiment, the raising / lowering drive part 36 employ | adopts the structure that it is provided below the surface which mounts the conveyed product H on the raising / lowering stand 21, The dust generation of the raising / lowering drive part 36 is carried out. It can suppress adhering to the conveyed product H mounted on the lifting platform 21. FIG.

  In the present embodiment, the frame column member 31 has an opening 33 formed along the movement path of the nut block 37, and an opening in a region other than the region corresponding to the position of the convex portion 39 of the nut block 37. By adopting a configuration in which a clean belt 60 that covers and closes the portion 33 is provided, dust generated from the ball screw 35 or the like provided inside the frame column member 31 flows out to the outside through the opening 33. Can be prevented.

  Further, in the present embodiment, by adopting a configuration in which the filter unit 61 that causes the air inside the frame column member 31 to flow out of the frame column member 31 through the dust collection filter 63 is employed, By letting the air in the frame column member 31 flow out, the air can be ventilated while the dust collecting filter 63 removes the dust.

  Further, in the present embodiment, by adopting a configuration in which the fork device 40 for transferring the conveyed product H to and from the transfer target unit is provided on the lifting platform 21, the transfer target unit and The transfer object H can be transferred between the two.

  As mentioned above, although preferred embodiment of this invention was described referring drawings, this invention is not limited to the said embodiment. Various shapes, combinations, and the like of the constituent members shown in the above-described embodiments are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

  For example, in the present embodiment, it has been described that the connecting portion 70 includes the spherical bearing 71. However, the present invention is not limited to the above configuration, and for example, a combination of a plurality of bearings that can rotate in a predetermined direction. May be substituted. Further, for example, a variable member such as an elastic member may be incorporated in the connecting portion 70 to absorb the inclination of the ball screw 35 elastically.

It is a top view which shows the raising / lowering cart in embodiment of this invention. It is a right view which shows the raising / lowering trolley | bogie in embodiment of this invention. It is a top view which shows the raising / lowering cart in embodiment of this invention. It is line AA sectional drawing of the pillar part shown in FIG. 1 in embodiment of this invention. It is line BB sectional drawing of the pillar part shown in FIG. 1 in embodiment of this invention. FIG. 2 is a partially enlarged cross-sectional view taken along line CC in FIG. 1, showing a configuration of a connecting portion on the −X direction side in the embodiment of the present invention. FIG. 2 is a partially enlarged cross-sectional view taken along line B-B in FIG. It is a figure explaining the effect | action of the connection part in embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Elevating cart, 10 ... Bogie, 20 ... Elevating device, 21 ... Elevating platform, 30 ... Column, 31 ... Frame column member, 33 ... Opening, 35 ... Ball screw (screw shaft), 36 ... Elevating drive unit ( Drive unit), 37 ... nut block (movable part), 40 ... fork device (transfer device), 60 ... clean belt (shield member), 61 ... filter unit (air conditioning unit), 63 ... dust collecting filter, 70 ... connection , 71 ... spherical bearing, 75 ... connection frame (connection member), H ... conveyed material (luggage)

Claims (7)

A carriage that includes a carriage that moves along a floor surface, and an elevator that is installed on the carriage and that allows the elevator to move up and down in a direction perpendicular to the floor surface,
The lifting device is
A frame pillar member erected on the carriage, a screw shaft provided in the frame pillar member and capable of rotating forward and backward around an axis extending in the vertical direction, and a drive unit for driving the screw shaft to rotate forward and backward And a plurality of pillar portions that are screwed to the screw shaft, move along the frame pillar member by rotational driving of the screw shaft, and include a movable portion coupled to the lifting platform,
An elevator car comprising a connecting part for connecting the movable part and the elevator table so as to be relatively rotatable about a predetermined axis.   The elevating carriage according to claim 1, wherein the connecting portion includes a spherical bearing. The column part and the connection part are provided on both sides in a predetermined direction of the lifting platform,
3. The lifting cart according to claim 1, wherein the one connecting portion in the predetermined direction includes a connecting member rotatably connected to the movable portion and rotatably provided on the lifting platform.   The said drive part is provided in the downward direction rather than the surface which mounts a load on the said lift stand, The lift stand as described in any one of Claims 1-3 characterized by the above-mentioned. The frame column member has an opening formed along a movement path of the movable part,
The elevating carriage according to any one of claims 1 to 4, further comprising a shield member that covers and closes the opening in a region other than a region corresponding to the position of the movable portion.   The elevating carriage according to any one of claims 1 to 5, further comprising an air conditioning unit that causes the air inside the frame column member to flow out of the frame column member via a dust collection filter.   The lifting platform according to any one of claims 1 to 6, wherein the lifting platform is provided with a transfer device that transfers a load to and from the transfer target portion.

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