JPH048087Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention provides a mobile storage device, specifically, an endless track having an arc section and a straight section, and a plurality of wheels equipped with wheels running on the track. The present invention relates to a mobile storage device in which carts are arranged and the carts are transported along the endless track by a drive device.

(Prior Art) In general, this type of mobile storage device includes an endless guide rail having a circular arc portion and a straight portion, as shown in, for example, Japanese Utility Model Application Publication No. 58-55636. Two wheels running on the tracks and a guide running along the guide rails are placed between the endless guide rails and the endless tracks, and two wheels running on the tracks are disposed vertically facing each other. A driving device comprising a pair of sprockets having a diameter smaller than the arc portion of the track and an endless chain extending between these sprockets is arranged in the track. An endless chain is hooked to the truck, and the truck is driven by the drive device to travel along the endless track and the endless guide rail.

By the way, regarding the above mobile storage device,
Generally, the bogie runs on an endless track with two wheels provided on the underside of the bogie, and as schematically shown in FIG. It is arranged in such a way.

(Problems to be Solved by the Invention) As described above, the bogie is unstable because the two wheels of the bogie are arranged so as to straddle the endless track, and run on the endless track. Therefore, if due to some abnormality, for example, a large item stored in the rack (shelf) of the trolley shifts and is not securely stored on the rack and ends up being stored outside, the above-mentioned For example, when the load hits a support provided to support the upper endless guide rail, the rack is pressed backwards on the opposite side to the running direction of the truck, causing the truck to tilt There has been a problem in that the front wheel of the two wheels is located higher than the upper surface of the endless track, causing the bogie to float up, causing the bogie to come off its wheels.

The present invention has been devised in view of the above-mentioned circumstances. By detecting the floating of the bogie, it is possible to prevent accidents of the bogie from falling off the wheels. It is an object of the present invention to provide a mobile storage device that can detect the entire stroke of the circulation transfer path and can reliably and quickly prevent the wheels from coming off.

(Means for Solving the Problems) In order to solve the above problems and achieve the above objects, the present invention aims to
An endless track 1 and an endless guide rail 2 are provided vertically to face each other, and a wheel 31 running on the endless track 1 is provided between the endless track 1 and the endless guide rail 2. A mobile storage device in which a plurality of carts 3 equipped with racks 33 and a plurality of stages are interposed and these carts 3 are transported along the endless track 1 and the guide rail 2 by a drive device 4,
An axial light is emitted near the upper surface of the rack 33 on the reciprocating linear transfer path of the cart 3 over the entire length of both linear transfer paths, and by blocking the axial light, the cart 3 is In addition to providing photoelectric switches 5, 5 for detecting displacement with respect to the endless track 1,
The present invention is characterized in that a command means 6 is provided for outputting a command to stop the drive device 4 when the photoelectric switches 5, 5 detect the displacement of the trolley 3.

(Function) According to the present invention, if an abnormality occurs in which the cart 3 tilts while traveling on the reciprocating linear transfer path and the cart 3 floats up, the rack on the reciprocating linear transfer path of the cart 3 The axial light emitted from the photoelectric switches 5, 5 provided near the top surface of 33 along the entire length of both linear transfer paths is blocked by the trolley 3, and as a result, the floating trolley 3 Regardless of the position on the reciprocating linear transfer path, the photoelectric switch 5 is activated and the endless track 1 of the trolley 3 is activated.
It is possible to reliably and quickly detect lifting of the bogie 3, and when this is detected, the command means 6 outputs a command to stop the drive device 4, thereby preventing an accident of the cart 3 coming off the wheels. This is possible.

Furthermore, even if an abnormality occurs in which the cart 3 lifts up on the arcuate transfer path, the cart 3 that is continuous with the cart 3 and is moving on the linear transfer path through which the axial lights of the photoelectric switches 5, 5 pass will lift up. Since this can be detected by the photoelectric switches 5, 5, in other words, even if the truck 3 stops on the circular arc transfer path, the truck 3 is still being moved by the drive device 4, so With respect to the cart 3 located on the transfer path, the following cart 3 that is about to be moved to the arcuate transfer path interferes with the rack 33 of the stopped cart 3, causing the following cart 3 to float on the straight transfer path. As a result, it is possible to detect the lifting of the cart 3 by the photoelectric switches 5, 5, and as a result, it is possible to detect the lifting of the cart 3 throughout the entire stroke of the circulation transfer path of the cart 3. Prevents derailment accidents,
And it can be quickly prevented.

(Embodiments) Hereinafter, the mobile storage device according to the present invention will be described in more detail based on embodiments shown in the drawings.

In the figure, 1 is a semicircular arc portion 1a, 1
a and a pair of linear parts 1b, 1b extending in the tangential direction so as to connect both ends of the circular arc parts 1a, 1a; and the arc portions 2a, 2a
An endless guide rail having an oval shape in plan view and consisting of a pair of straight parts 2b, 2b extending in the tangential direction so as to connect both ends of the endless guide rail 2.
and an endless track 1 are arranged vertically facing each other with a predetermined interval.

Further, 3 indicates the endless track 1 and the endless guide rail 2.
It is a box-shaped trolley that runs interposed between the trolley 3, and two wheels 31, 31 made of casters running on the track 1 are provided at a predetermined interval on the lower surface of the trolley 3. Two guide wheels 32, 32 that move along the endless guide rail 2 are provided on the upper surface of the truck 3, and the interior of the truck 3 is provided with a plurality of stages at predetermined intervals in the vertical direction. Rack 33... is provided, cargo is stored on the rack 33..., and the cargo of the trolley 3 is circulated on the endless track 1 via the guide wheels 32, 32 and the wheels 31, 31. It's done like this.

Further, a drive device 4 for driving the truck 3 is disposed below the truck 3 within the track 1.

The drive device 4 basically includes a pair of sprockets 41, 41 whose diameter is smaller than the arcuate portions 1a, 1a of the raceway 1, and these sprockets 41, 41.
It consists of an endless chain 42 extending between the sprockets 41, 41 and the circular arc portion 1 of the raceway 1.
A shaft 43 is provided upright at the radial center of each of the shafts a and 1a, and the sprocket 41,
By assembling the sprockets 41 freely to rotate, the sprockets 41, 41 are arranged on a concentric circle with the arc portions 1a, 1a, and both sprockets 41, 4
1, the endless chain 42 is spanned over it.

A small-diameter sprocket 44 is fixed to the lower surface of one of the sprockets 41, and the small-diameter sprocket 44 and a gear reduction mechanism 46 driven by a motor 45 are interlocked and connected via a drive chain 47 to drive the motor 45. Thus, the endless chain 42 is rotated between the sprockets 41, 41.

Therefore, in the mobile storage device constructed as described above, the present invention provides shafts near the upper surface of the rack 33 in the reciprocating linear transfer path of the trolley 3 over the entire length of both the linear transfer paths. A photoelectric switch 5,5 is provided which emits light and detects the displacement of the trolley 3 with respect to the endless track 1 by blocking the axial light.
When the displacement of the trolley 3 is detected by the drive device 4
A command means 6 is provided for outputting a command to stop the motor.

The photoelectric switch 5 consists of a pair of light emitting side switch and light receiving side switch, and as shown in FIGS. At both left and right ends of the upper horizontal rod constituting the support provided in the support column, at a position slightly above the upper frame of the bogie 3 that is interposed between the endless track 1 and the endless guide rail 2 and runs, and the endless guide rail Straight line part 2 of 2
b, 2b are provided opposite to each other in the length direction, and if one is used as a light-emitting side switch, the other is used as a light-receiving side switch.

When the photoelectric switch 5 is used in this way, it is possible to detect the overload more quickly and reliably than, for example, using a thermal relay to detect an overload.

Further, as the command means 6, as shown in FIGS. 1 and 3, an alarm equipped with a flashing lamp and a buzzer to notify the displacement of the truck 3 may be provided at an appropriate location on the support, but the photoelectric It may be electrically configured such that a switch that stops the drive device 4 is activated when the switch 5 detects the displacement of the truck 3.

(Effect of the invention) The mobile storage device according to the invention has the above-mentioned configuration, and according to the invention, lifting of the cart 3 is detected by blocking the axial light emitted from the photoelectric switches 5, 5. By doing so, it is possible to prevent a derailment accident of the truck 3, and in addition, the photoelectric switches 5, 5 are placed near the upper surface of the rack 33 on the reciprocating linear transfer path of the truck 3.
By providing each of the linear transfer paths so as to emit an axial light over the entire length thereof, lifting of the cart 3 can be detected during the entire journey of the cart 3 in the circulation transfer path, and This makes it possible to reliably and quickly prevent wheel derailment accidents.

That is, if an abnormality occurs in which the cart 3 tilts while traveling on the reciprocating linear transfer path and the cart 3 floats up, the photoelectric switch 5 provided near the top surface of the rack 33 on the reciprocating linear transfer path of the cart 3 .
However, regardless of the position on the reciprocating linear transfer path, the photoelectric switch 5 operates to reliably and quickly detect lifting of the bogie 3 with respect to the endless track 1. , upon this detection, the command means 6 outputs a command to drive the drive device 4.
Therefore, it is possible to prevent the truck 3 from falling off its wheels.

Furthermore, even if an abnormality occurs in which the cart 3 lifts up on the arcuate transfer path, the cart 3 that is continuous with the cart 3 and is moving on the linear transfer path through which the axial lights of the photoelectric switches 5, 5 pass will lift up. Since this can be detected by the photoelectric switches 5, 5, in other words, even if the truck 3 stops on the circular arc transfer path, the truck 3 is still being moved by the drive device 4, so With respect to the cart 3 located on the transfer path, the following cart 3 that is about to be moved to the arcuate transfer path interferes with the rack 33 of the stopped cart 3, causing the following cart 3 to float on the straight transfer path. As a result, it is possible to detect the lifting of the cart 3 by the photoelectric switches 5, 5, and as a result, it is possible to detect the lifting of the cart 3 throughout the entire stroke of the circulation transfer path of the cart 3. Prevents derailment accidents,
And it can be quickly prevented.

[Brief explanation of drawings]

FIG. 1 is a partially omitted front view of an embodiment of the mobile storage device according to the present invention, FIG. 2 is a partially omitted plan view, FIG. 3 is a side view, and FIG. It is a schematic explanatory view showing the arrangement state of the wheels provided on the endless track. 1... Endless track, 1a... Arc part (of the endless track), 1b... (Same) straight part, 3... Bogie, 3
1... Wheels, 4... Drive device, 5... Photoelectric switch, 6... Command means.

Claims (1)

[Scope of utility model registration request] An endless track 1 and an endless guide rail 2 having circular arc parts 1a, 2a and straight parts 1b, 1b are provided vertically facing each other, and between the endless track 1 and the endless guide rail 2, A mobile type in which a plurality of carts 3 equipped with wheels 31 running on a track 1 and a plurality of racks 33 are interposed, and these carts 3 are transported along the endless track 1 and guide rail 2 by a drive device 4. In the storage device, axial light is emitted near the top surface of the rack 33 on the reciprocating linear transfer path of the truck 3 over the entire length of both the linear transfer paths, and the axial light is blocked, Provided with photoelectric switches 5, 5 for detecting the displacement of the bogie 3 with respect to the endless track 1, and a command for outputting a command for stopping the drive device 4 when the photoelectric switches 5, 5 detect the displacement of the bogie 3. A mobile storage device characterized in that means 6 are provided.