JPH0620925B2 - Crane lift carriage drive - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an elevator carriage drive device for raising and lowering an elevator carriage of a traveling crane for loading and unloading used in an automatic warehouse or the like.

(Prior Art and Problems Thereof) It has been known that a conventional crane of this type hangs an elevator carriage and a counterweight in a fishing bottle type by an elevator drive chain. A drive toothed wheel that drives the chain and a motor with a reducer that rotationally drives the chain are arranged on the upper end side of the crane column.

With such a configuration, the center of gravity of the entire crane becomes high,
Not only was the balance unbalanced, but maintenance of the lifting drive unit was difficult.

Therefore, as described in, for example, Japanese Utility Model Publication No. 50-35513, a drive pulley that drives a wire rope that suspends an elevator carriage and a motor that rotates the drive pulley are installed on the side of the lower end of the crane column. It was thought that the middle part of the wire rope pulled down from the upper end of the crane column should be hung on the drive pulley, but in this conventional configuration, it is necessary to mount the platform on the side of the crane column and install the motor on this platform. In addition to the increase in the number of parts, it was necessary to increase the strength of the crane support.

Moreover, since the drive wheels (pulley) arranged on the side of the crane column are attached to the front-rear horizontal drive shaft,
It was not possible to use a chain that was advantageous in terms of strength, and a special wire rope was required.

Of course, it is conceivable to mount a driving toothed wheel and a motor with a reducer for rotating the driving toothed wheel on the lower frame of the crane.
As described in Japanese Patent Publication No. 14589, a motor with a speed reducer is mounted on a lower frame of a crane so that the motor section is vertically oriented, and a drive shaft protruding horizontally from the motor with the speed reducer. Since the chain drive toothed wheel was installed, not only the installation surface of the motor with reduction gear had to be secured on the crane lower frame, but also the motor section became high, so the motor section for maintenance work etc. Desorption work was not easy.

In other words, the problem of the carriage drive device described in Japanese Utility Model Publication No. 50-35513 is solved by Japanese Patent Publication No. 49-1.
Even if an attempt is made to solve the problem by combining the configuration of the carriage drive device described in Japanese Patent No. 4589, the mounting surface of the motor with the reduction gear is secured on the lower frame of the crane, and the board for mounting and many bolts and nuts, etc. Therefore, it is not possible to expect a significant cost reduction, and it is not possible to make the maintenance work truly easy by lowering the motor section sufficiently.

(Means for Solving the Problem) The present invention proposes a carriage driving device capable of solving the above-mentioned conventional problems, the features of which are shown by the reference numerals of the embodiments described later. And the carriage drive device of the present invention is an elevator drive chain (16, 1) for suspending the elevator carriage (6) and the counterweight (29) in a fishing bottle type.
7) and the drive shaft on which the chain drive teeth (23, 24) are mounted
(32), motor with reduction gear (22), and coupling means for preventing rotation
(36, 37), the drive shaft (32) is horizontally and horizontally supported by the crane lower frame (1) via a pair of left and right bearings (34, 35), and the motor with reduction gear (22) is A vertical transmission portion (31) supported at one end of the drive shaft (32) protruding from the bearing (34) on one side,
The drive shaft is attached in a cantilevered manner to the upper end of this transmission unit (31).
It consists of a motor part (30) located horizontally right and left just above (32) and drives the drive shaft (32) .The lifting drive chains (16, 17) are composed of crane columns (5a, The lifting carriage (6) and the counterweight (29) are specifically hung at both ends hanging from the upper end of the 5b), and the middle part pulled down from the upper end of the crane column (5a, 5b) is the drive tooth ring. (23,24), the detent means (36,37) are connected to the motor (22)
And the lower frame (1) side of the crane are connected to each other to prevent the motor (22) with a reducer from swinging back and forth around the drive shaft (32).

(Example) Hereinafter, one example of the present invention will be described with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a lower frame, a traveling drive unit 2 is detachably attached to a front end, and driven wheel units 3 are detachably attached to a rear end.
Reference numeral 4 denotes an upper frame, which is connected to the lower frame 1 by a pair of front and rear columns 5a and 5b, and an elevator carriage 6 is arranged between the pair of front and rear columns 5a and 5b. A load transfer means 7 such as a running fork is mounted on the lift carriage 6.

The drive unit 2 for traveling is mounted on a machine frame 8 which is detachably attached to the front end of the lower frame 1, and a drive wheel 10 rolling on a guide rail 9 on the floor and a steady-state guide roller 11 for sandwiching the guide rail 9 therebetween. And support shafts and drive wheels 1
A motor 12 with a speed reducer for driving 0 is attached to one side of the machine frame 8. The driven wheel unit 3 includes a driven wheel 14 rolling on the guide rail 9 and a guide rail 9 mounted on a machine frame 13 detachably attached to the rear end of the lower frame 1.
The anti-sway guide roller 15 for sandwiching is pivotally supported.

As shown in FIGS. 1 and 2, the pair of front and rear lift drive chains 16 and 17 for suspending the lift carriage 6 includes guide teeth 18 and 19 pivotally supported in the upper frame 4 and one end of the upper frame 4. Coaxial guide tooth ring 2 that is axially supported inside
It is turned downward by 0, 21 and guided downward along the outer side of the support column 5a, and then is bridged over the drive toothed wheels 23, 24. Then, the chains 16 and 17 turned up again.
Is introduced into the inside of the support column 5a by coaxial guide teeth 25, 26 and 27, 28 in the upper frame 4, and the counterweight 2 loosely fitted in the support column 5a so as to be vertically movable.
The counterweight 29 is suspended by being connected to the unit 9.

As shown in FIG. 3 and FIG. 4, the driving toothed wheels 23, 24 have a pair of left and right bearings 34, 34 on the upper front end of the lower frame 1.
35 to the drive shaft 32 supported horizontally horizontally
It is attached at an intermediate position between both bearings 34 and 35. 22
Is a motor with a reduction gear, and is a vertically longitudinal transmission portion 31 supported by one end of a drive shaft 32 protruding from a bearing 34 on one side, and a motor cantilevered inside the upper end of the transmission portion 31. And a motor unit 30.
Are configured to be positioned horizontally right and left just above the drive shaft 32 (drive teeth 23 and 24). Then,
The motor unit 30 rotationally drives the drive shaft 32 via the transmission means in the transmission unit 31, but the reaction force at the time of driving thereof tends to reversely rotate around the drive shaft 32, so that the bearing 3
4, 35, a bracket 36 attached to the base 33, and a connecting pin 37 for connecting the bracket 36 and the projecting portion 31a of the transmission portion 31 to each other.
The motor 22 with a reducer and the lower frame 1 are connected.

In FIG. 1, 38 is a ceiling side guide rail for guiding the upper frame 4.

The crane configured as described above can be moved forward or backward along the guide rails 9 and 38 by driving the drive wheels 10 in the traveling drive unit 2 with the motor 12. Further, when raising / lowering the raising / lowering carriage 6 in order to make the load transfer means 7 correspond to an arbitrary height of the shelf, the motor unit 30 of the motor 22 with a speed reducer is operated, and its rotation is transmitted to the transmission unit 31. It is sufficient to rotate the pair of drive chains 16 and 17 by transmitting them to the drive shaft 32 and rotating the drive teeth 23 and 24.

That is, when raising the elevator carriage 6, it is sufficient to rotate the drive wheels 23 and 24 in the forward direction to rotate the chains 16 and 17 in the direction in which the elevator carriage 6 is lifted. The counterweight 29 suspended by 17 descends by gravity. When lowering the lifting carriage 6, the drive teeth 23, 2
When the chains 16 and 17 are rotated in the direction in which the counterweight 29 is lifted by reversing 4 and the counterweight 29 is lifted, the lift carriage 6 is lowered by gravity.

When the drive toothed wheels 23 and 24 are rotationally driven, the motor 30 and the speed reducer 31 receive a rotational force in the opposite direction around the output shaft 32 due to the reaction force. It is received by the lower frame 1 via the base 33. Therefore, the coupling pin 37 is configured to be sheared when an overload of a certain amount or more acts on the lifting carriage 6 side, and the movement of the motor 22 with a reduction gear that rotates within a certain range around the drive shaft 32 is performed. If configured to detect with a limit switch or the like, the connecting pin 37 of the rotation stopping connecting means can be utilized as a torque limiter.

In the above embodiment, as shown in FIG.
The motor unit 30 of the motor 22 with a speed reducer is located at an intermediate position between the chains 16 and 17 which make a U-turn by being stretched over the 4. Therefore, the diameters of the drive teeth 23 and 24 must be taken into consideration so that the chains 16 and 17 do not come into contact with the motor 30, but as shown in FIG. It is also possible to provide guide teeth 39a, 39b for expanding the distance between the chains 17, 17 for each of the chains 16, 17. The guide toothed wheels 39a, 39b are provided on the base 33, and the brackets 4 are provided continuously from the bearings 34, 35 protruding from the base 33.
It can be pivoted to 0.

(Effects and Effects of the Invention) As described above, according to the lifting / lowering carriage drive device for a crane of the present invention, the lifting / lowering carriage and the counterweight are hung on both ends of the lifting / lowering drive chain in a fishing bottle manner to lift / lower the lifting carriage. While reducing the power required, a reduction gear motor for rotating the lifting drive chain is arranged on the lower frame, so maintenance and inspection of the reduction gear motor is easy and the crane as a whole is Although the center of gravity is lowered and the stability is improved, the following operational effects can be expected particularly according to the configuration of the present invention.

That is, since the motor with reduction gear is supported by the end of the drive shaft for raising and lowering the carriage supported by the crane lower frame and the coupling means for rotation prevention, the motor with reduction gear is mounted on the lower drive frame or the side of the crane column. It is not necessary to secure a surface, and, of course, a pedestal for mounting a motor with a reducer and a large number of bolts and nuts for mounting are also unnecessary. Moreover, since the motor portion of the motor with the reduction gear is disposed right above and above the drive shaft in a horizontally horizontal shape, the center of gravity of the motor portion can be lowered while shortening the total length of the crane.

Therefore, it is possible to reduce the size and weight of the crane as a whole and to significantly reduce the cost, and it becomes easy to attach and detach the motor unit during maintenance work.

[Brief description of drawings]

FIG. 1 is a side view of the entire crane, FIG. 2 is a perspective view for explaining a hanging state of a carriage raising / lowering drive chain, FIG. 3 is a rear view showing a main portion of a carriage driving device, and FIG. 4 is the same side view. 5 is a vertical sectional side view showing a modified example of the carriage driving device. 1 ... Lower frame, 2 ... Driving unit, 3 ...
... Driven wheel unit, 4 ... Upper frame, 5a, 5b
…… Posts, 6 …… Elevation carriage, 16,17 …… Cage for raising and lowering carriage, 22 …… Motor with reduction gear,
23, 24 ... Drive tooth ring, 29 ... Counterweight, 30 ... Motor part of motor with reducer, 31 ... Transmission part of motor with reducer, 32 ... Drive shaft, 34, 35
...... Bearing, 37 …… Coupling pin (coupling means for preventing rotation).

Claims (1)

[Claims] 1. A lifting carriage (6) and a counterweight.
(29) Lifting chain (16,17) for hanging and fishing bottle type
And the drive shaft (32) with the chain drive teeth (23,24) attached
, A motor with reduction gear (22), and a coupling means (36,
37), the drive shaft (32) is horizontally and laterally supported on the crane lower frame (1) via a pair of left and right bearings (34, 35), and the reduction gear motor (22) is mounted on one side. A vertical transmission part (31) supported at one end of the drive shaft (32) protruding from the bearing (34),
The drive shaft is attached in a cantilevered manner to the upper end of this transmission unit (31).
It consists of a motor part (30) located horizontally right and left just above (32) and drives the drive shaft (32) .The lifting drive chains (16, 17) are composed of crane columns (5a, The lifting carriage (6) and the counterweight (29) are specifically hung at both ends hanging from the upper end of the 5b), and the middle part pulled down from the upper end of the crane column (5a, 5b) is the drive tooth ring. (23,24), the detent means (36,37) are connected to the motor (22)
A crane lift carriage drive that connects the crane lower frame (1) side to prevent the motor with reduction gear (22) from swinging back and forth around the drive shaft (32).