JPH0192108A - Elevating carriage drive device for warehouse crane - Google Patents

Abstract

PURPOSE:To make it possible to mount an elevating carriage drive device for a crane in an automatic warehouse, on a lower section frame by bearing the output shaft of a motor incorporating a speed reduction unit on the lower section frame, horizontally and laterally, and by disposing a rotation check coupling means between the lower section frame and the speed reduction unit. CONSTITUTION:Drive gears 21, 22 and bearings 32, 33 on both sides of the gears are fitted on the output shaft 31 of a speed reduction unit 30 in a motor 29 incorporating the latter, the output shaft 31 being journalled to a base 34 on a lower section frame 1 by means of the bearings 32, 33. With this arrangement the motor 29 is supported horizontally and laterally right above the lower section frame. Further, a coupling pin 36 disposed between a bracket 35 secured to the base 34 and a bulged part of 30a of the casing of the speed reduction unit 30 inhibits the motor 30 and the speed reduction unit 30 from being rotated about the output shaft 31. Further, carriage slinging chains which are not shown are wound around the drive gears 21, 22. With this arrangement, it is possible to install a motor in a narrow lower frame.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an elevating carriage drive device for a traveling lane used for loading and unloading work to and from shelves in an automated warehouse.

(Prior art and its problems) The elevating carriage drive device for this type of running lane rotates a chain that suspends the elevating carriage by a drive gear driven by the output shaft of a motor with a reduction gear. However, in a conventional carriage drive device, the motor with a reduction gear is installed on the lower frame of a crane, and the drive gear is attached to an output shaft that projects in a cantilevered manner from the motor with a reduction gear. was installed.

In such a conventional configuration, installing a motor with a reducer requires a large placket and a wide installation area, so it is necessary to install the motor with a reducer with sufficient strength on a narrow crane lower frame. It wasn't easy.

(Means for Solving the Problems) The present invention proposes a carriage drive device capable of solving the conventional problems as described above. A coupling means for preventing rotation is provided between the motor with a reduction gear and the lower frame, the coupling means being supported horizontally on the frame by a bearing and preventing the motor with a reduction gear from rotating around the output shaft. A chain for driving the elevating carriage up and down is interposed between the driving gear wheels attached to the output shaft.

(Embodiment) An embodiment of the present invention will be described below based on the attached illustrative drawings. In FIG. 1, 1 is a lower frame,
It includes driving wheels 3 and driven wheels 4 that move on a lower guide rail 2 laid on the floor. Reference numeral 5 denotes an upper frame equipped with vertical shaft rollers 7 for steady rest that sandwich an upper guide rail 6 installed on the ceiling side, and is connected to the lower frame 1 via a pair of front and rear vertical supports 8a, 8b. There is. Reference numeral 9 is an elevating carriage supported between columns 8a and ab so as to be movable, and is equipped with a load transfer means 10 such as a running fork.

As shown in FIGS. 1 and 2, the elevating carriage 9
One end 11a, 12a of a carriage hanging chain (double chain) 11.12 is secured to both front and rear ends of the carriage.

One chain 11 is turned downward by a guide gear wheel 13 that is pivotally supported inside one end of the upper frame 5, and then installed in the support column 8a. It is introduced into the support column 8a via a guide tooth ring 14 pivotally supported inside the end and a guide tooth ring 15 coaxially supported with the guide tooth ring 13.

The chain 11.12 introduced into the column 8a is guided into the lower frame 1 via an opening 16 (see FIG. 7) formed between the lower end of the column 8a and the upper surface of the lower frame 1. Then, the lower frame 1 is opened again through the opening 19 (see FIG. 7) provided on the upper surface of the lower frame 1 outside the support column 8a via the coaxial guide gear wheels 17 and 18 in the lower frame 1. The chain 11.12 guided upward is passed over the coaxial drive gear wheel 21.22 of the drive unit 20 installed on the bottom seam 1, and then passed through the opening 19 again. It is guided into the lower frame 1 via.

Both chains 11 and 12 returned into the lower frame 1 via the drive unit 20 are guided by coaxial guide gear wheels 23 and 24.
Two chain tensioning means installed in parallel via 25.26
The chains 11 and 12 that passed through the chain tensioning means 25 and 26 are divided into front and rear parts, and the front chain 11
is guided onto the lower frame 1 via an opening (not shown) provided in the lower frame 1 inside the column 8a, and is led upward along the column 8a, and then placed in front of the lifting carriage 9. A free end portion 11b is locked on the lower side. The other rear chain 12 also has two guide gear wheels 27, which are pivotally supported within the lower frame 1 near the lower end of the other support column 8b.
28, it is led out onto the lower frame 1 via an opening (not shown) provided in the lower frame 1 inside the column 8b, and is guided upward along the column 8b, and is lifted and lowered. Free end 12b on the rear lower side of the carriage 9
is locked.

As shown in FIGS. 5 to 7, the drive unit 20 includes a motor (with a brake) 29 and a reducer 30 directly connected to the motor, and the pair of drive gears are connected to the output shaft 31 of the reducer 30. 21 and 22 are fixed. The motor 29 and the reducer 30 have an output shaft 31 of the reducer 30.
are supported on the base 34 on the lower frame 1 by bearings 32.33 on both sides of the drive gear wheels 21.22,
The motor 29 is supported on the lower frame 1 in a state in which it is positioned horizontally right above the lower frame 1 (right above the drive gear wheels 21 and 22). A bracket 35 fixed to the base 34 and a case projecting portion 30a of the reducer 30 serve as a rotation-stopping coupling means for preventing the motor 29 and the reducer 30 from rotating around the output shaft 31.
are connected by a connecting pin 36.

As shown in FIGS. 3 and 4, both chain tensioning means 25 and 26 include a common machine frame 37, movable gear wheels 38 and 39 supported by the machine frame 37 so as to be movable in the front and rear direction, and the a-frame. 3
7, and a spring 44.45 that urges rearwardly a movable body 42.43 which is slidable in the front and back direction and which pivotally supports the movable tooth wheels 38 and 39.
The chains 11 and 12 are stretched over the movable gear wheels 38 and 39 and the guide gear wheels 40 and 41 in an S-shape, and the movable gear wheels 38 and 39 are connected to springs 44 and 45.
They are each tensioned by being biased backwards separately.

46.47, the spring receiver is a plate, and each movable body 42
．． The spring 44.45 is positioned by a nut 1-50.51 that is screwed onto screw shafts 48 and 49, one end of which is fixed to the nut 50.51.
The chain tensioning force can be adjusted. Incidentally, limit switch actuating cams 52 and 53 are connected to the plates 46 and 47 of both of these spring holders, respectively, and the check 71
1. When 12 extends beyond a certain length or Che 71
1 and 12 go out, two glue mint switches 55 (not shown in FIG. 4, attached to both left and right sides of the bracket 54, attached to the machine frame 37 via a bracket 54, limit switch 55
(only one of which is shown) is configured to be operated separately.

Note that 56 is a traveling drive unit that drives the drive wheels 3. Furthermore, since the supports 8a and 8b are made of square pipe material, the width of the space within the support does not become smaller even if it deviates back and forth from the center, compared to a case where the supports are made of round pipe material. Therefore, even when the two chains 711 and 12 are passed through the support 8a in a parallel state, the entire space within the support 8a is utilized to prevent the check 7 and the inner surface of the support from coming into sliding contact. 7 can be easily stretched.

The warehouse crane configured as described above can be made to travel along the lower guide rail 2 by rotating the drive wheels 3 by the traveling drive unit 56. When the elevating carriage 9 is to be raised or lowered to the target loading/unloading work level, the motor 29 in the drive unit 20 is operated to rotate the drive gears 21 and 22 via the reduction gear 30 and the output shaft 31. As a result, both ends 11
Loop-shaped carriage hanging check 711.1 in which a, llb and 12a, 12b are locked to the lifting carriage 9
2 rotates, and the elevating carriage 9 moves up and down along the supports 8a and 8b.

At this time, the chains 711 and 12 rotate in such a manner that the continuous portion between the upper and lower frames 1.5 completely penetrates the inside of the support column 8a from the upper end to the lower end.

As described above, when the rotational force of the motor 29 is decelerated by the deceleration Ia30 and transmitted to the output shaft 31 to rotationally drive the drive gear wheels 21 and 22, the reaction force causes the motor 29 and the deceleration [
A rotational force in the opposite direction centering on the output shaft 31 acts on the output shaft 30, but this rotational force is applied to the lower part through the coupling pin 36, which is a coupling means for preventing rotation, the bracket 35, and the base 34. The receiver is fixed to frame 1. However, a coupling pin 36 that also serves as a torque limiter is used so that the coupling pin 36 is sheared when an overload of a certain level or more occurs on the lifting carriage 9 side that is driven to move up and down.
It is also possible to use a limit switch or the like to detect the reverse rotation of the motor 9 and the deceleration a30 around the output shaft 31 within a certain range, and automatically cut off the power to the motor 29.

(Operations and Effects of the Invention) According to the elevating carriage drive device for a warehouse crane of the present invention, which can be implemented as described above, the motor with a reduction gear can be installed by supporting its output shaft with a bearing, and the structure is simple. Installation requires only a space-saving coupling means for preventing rotation, and its support structure is extremely simple, and large brackets and wide installations do not require space, so it can be installed on the narrow lower frame of a crane. It is also possible to easily and stably install a motor with a reducer. Further, as explained in the embodiment, the rotation preventing coupling means is
It has the advantage that it can also be used as a torque limiter for a motor with an x-speed gear.

In particular, as shown in the embodiment, the output shaft 31 is supported by a pair of bearings 32 and 33 on both sides of the drive gear wheels 21 and 22 attached to the output shaft 31, and the output shaft 31 is supported directly above the drive gear wheels 21 and 22. When the reducer 30 is arranged so that the motor 29 is positioned horizontally, it is possible to maintain a relatively good left-right balance.

[Brief explanation of the drawing]

Figure 1 is a side view of the entire crane, Figure 2 is a perspective view showing the tensioned state of the carriage hanging chain 7, Figure 3 is a side view of the chain tensioning means, Figure 4 is a plan view of the same, and Figure 5. 6 is a side view showing the elevating drive unit portion of the elevating carriage, FIG. 6 is a rear view of the same with the travel drive unit removed, and FIG. 7 is a plan view of FIG. 5. 1... Lower frame, 2... Lower guide rail, 3
... Drive wheel, 8a, 8b... Strut, 9... Elevating carriage, 11.12... Carriage suspension check 7.20... Carriage elevating drive unit, 21.2
2... Drive gear wheel, 25.26... Chain tensioning means,
29...Motor with brake, 30...Reducer,
31... Output shaft, 32.33... Bearing, 36...
Coupling pin (coupling means for preventing rotation). Figure 1

Claims (1)

[Claims] The output shaft of the motor with a speed reducer is supported horizontally by a bearing on the lower frame of the crane, and the rotation preventing coupling means for preventing the motor with a speed reducer from rotating about the output shaft is connected to the speed reducer. An elevating carriage drive device for a warehouse crane, which is interposed between a motor with a motor and a lower frame, and a chain for driving an elevating carriage up and down is spanned over a drive gear wheel attached to the output shaft.