JPH036084B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a device that uses a chain to drive an elevating carriage, such as an elevating carriage of a traveling crane for loading and unloading used in an automated warehouse, up and down using a chain. be.

(Prior art and its problems) Generally, the above-mentioned elevating conveyance platform can be suspended from two hanging points on the left and right using a single elevating drive chain, but the chain and gear wheels are In the elevating drive device used, the larger the chain pitch (link length) and the smaller the gear diameter (fewer teeth), the more vibrations are generated in the elevating conveyance platform that is raised and lowered by the chain. is known to occur. Therefore, in order to suppress the vibration of the elevating conveyance platform, it is best to use a chain with a small pitch (link length) or a gear ring with a large diameter, but the size of the chain to be used depends on the size of the load. Therefore, it is not possible to use a small chain that does not match the load size. Therefore, in the past, vibrations of elevating conveyors were suppressed by using gear wheels with as large a diameter as possible. In reality, it has not been possible to effectively suppress the vibrations of the elevating conveyance platform, as this would lead to an increase in the size of the entire traveling crane.

(Means for Solving the Problems) The present invention proposes an elevating drive device for an elevating conveyance platform that can solve the conventional problems as described above. A set of two chains whose positions are shifted in the length direction by half a pitch are used as the lifting drive chain for suspending the hanging point, and a set of two chains whose positions are shifted by a half pitch in the length direction are used as drive gear wheels that drive the lift drive chain by a half pitch. The reason lies in the use of double toothed rings.

(Function) In the device of the present invention, each hanging point is suspended by a set of two chains, so compared to the case where each hanging point is suspended by one chain, each hanging point is suspended by a set of two chains. As the chain, a small-count chain, that is, a chain with short link lengths can be used. or,
By using two gear wheels with a phase shift of half a pitch as described above, it is possible to use gear wheels with the same diameter as that used when suspending each suspension point with a single chain. , the situation is the same as using a gear ring with twice the number of teeth.

(Example) An example of the present invention will be described below based on the attached illustrative drawings.

In FIG. 1, reference numeral 1 denotes a traveling crane for loading and unloading used in automated warehouses, which travels along a fixed route guided by floor guide rails 2 and ceiling guide rails 3. 4 are the front and rear supports 5 of the crane 1;
It is an elevating and descending conveyance platform that moves up and down using a guide as a guide, and is equipped with a cargo receiving fork 6 that can be moved in and out of the left and right directions.

As shown in FIG. 2, the elevating conveyance platform 4 is suspended at two suspension points A and B at the front and rear by elevating drive chains 7 and 8, respectively. Both chains 7 and 8 are connected to the lower end C of the elevating conveyance platform 4 via guide free gear wheels 9a to 9d and 10a to 10e.
The drive gear 11,
12. Reference numeral 13 is an elevation drive motor, which connects the drive gears 11,
12.

According to the above configuration, the two elevating drive chains 7 and 8 suspend the elevating conveyance platform 4 by causing the drive gear wheels 11 and 12 to rotate normally by the motor 13.
By reversing the driving gear wheels 11 and 12, the elevating conveyance table 4 is lowered by its own weight at the speed at which the two elevating drive chains 7 and 8 are fed out.

In the elevating conveyance table elevating drive means as described above, each of the elevating drive chains 7 and 8 has a third
As shown in the figure, a pair of chains 15, 16 are used which are shifted in position by a half pitch p/2 in the length direction. Hanging ends 15 of the chains 15 and 16
a, 16a suspends the elevating conveyance platform 4 via a connecting member 18 that can see-saw around a support shaft 17 and an elevating rod 20 that can be moved up and down within a certain range and is biased downward by a spring 19. Connected to drop points A and B. 21 is a limit switch for detecting chain breakage. Lower end C of the elevating conveyance platform 4
A lifting rod 22 and a take-up spring 23 tensioning the chains 15, 16 via the lifting rod 22 are used to connect the chains 15, 16 against rotation.

A set of two chains 1 for each lifting drive chain 7, 8
5 and 16 are used, so naturally the third
As shown in the figure, each of the guiding free tooth wheels 9a to 9
d, 10a to 10e and two drive gear wheels 11, 12, respectively. 2 used as each guide free rotating gear 9a to 9d, 10a to 10e
A set of individual gears may be formed by using two gear wheels 24a, 24b in parallel that are independently rotatable. As shown in FIG. 4, the rings 25a and 25b are constituted by two toothed rings which are integrally connected to each other with a phase shift of half pitch p/2.

According to the above configuration, if conventionally, for example, #50 chains were used as the lifting drive chains 7 and 8, the two chains 15 and 16 would be combined as a set to suspend one suspension. Therefore, even if a #35 chain, which has a significantly shorter link length than a #50 chain, is used for these chains 15 and 16, it can sufficiently withstand the load. On the other hand, the same diameter
When using a tooth ring of about 100 mm, a #50 chain will have a tooth ring of 20T, and a #35 chain will have a tooth ring of 34T. In other words, the guiding free gear wheels 24a, 2
4b and the driving double gear wheels 25a and 25b, gear wheels with the number of teeth of 34T can be used without increasing the diameter. Moreover, the drive double toothed wheel 25
Since a and 25b are out of phase with each other by a half pitch p/2, the driving gear wheels 11 and 12 made up of the double toothed wheels 25a and 25b are driven by a lifting drive made up of a set of two chains 15 and 16, respectively. It acts as a gear ring with 68 teeth for chains 7 and 8.

As a result, each guiding free tooth ring 9a to 9d, 10
a to 10e and the drive gears 11 and 12 are of the same diameter as the conventional ones, and when the elevating conveyance table 4 is driven up and down by the elevating drive chains 7 and 8, the elevating conveyance table 4 is Driving can be effectively suppressed.

(Effects of the Invention) As described above, according to the elevating drive device of the elevating conveyance platform of the present invention, the vibration of the elevating conveyance platform during elevating drive can be suppressed without increasing the diameter of each tooth ring that engages with the elevating drive chain. Since both can be effectively suppressed, it is possible to carry out safe lifting and lowering conveyance operations without the risk of cargo collapse.

[Brief explanation of drawings]

Figure 1 is a side view showing a traveling crane for loading and unloading.
FIG. 2 is a schematic side view showing the elevating and lowering driving means of the elevating conveyance platform, FIG. 3 is a developed view of the main parts showing an embodiment of the present invention, and FIG. 4 is a side view showing the main parts of the drive gear. . DESCRIPTION OF SYMBOLS 1... Traveling crane for loading and unloading, 4... Elevating conveyor platform, 6... Fork for cargo delivery, 7, 8... Elevating drive chain, 9a to 9d, 10a to 10e...
Guide free rotation gear, 11, 12... Drive gear, 13
...lifting drive motor, 14...reducer, 15,
16...A set of two chains, 24a, 24b...
A set of two guiding free gear wheels, 25a, 25b...
Double gear ring.

Claims (1)

[Claims] 1. As a lifting drive chain for suspending each suspension point of the lifting conveyance platform, a set of two chains whose positions are shifted in the length direction by half a pitch is used, and as a drive tooth wheel for driving the lifting drive chain, An elevating drive device for an elevating conveyance platform that uses two gear wheels whose phase is shifted by half a pitch.