JPH054319B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to an elevating conveyor device that can be used as a so-called drop lifter that connects a low-level conveyor line and a high-level conveyor line, in particular, an elevating and descending conveyor device that can be freely moved up and down. The present invention relates to an elevating conveyance device, which is equipped with a movable body for elevating and descending conveyance supported by a guide column, and a chain connecting the movable body for elevating and conveying and a counterweight is suspended from a drive gear wheel operatively connected to a motor.

(Prior art and its problems) In a conventional elevating conveyance device of this kind, when a movable body for elevating and conveying is stopped at the lower limit position, the driving gear is activated based on a signal from a position detecting means of the movable body. The motor was controlled to stop.
In such a method, even if high-precision, high-class control is employed, it is difficult to always maintain a state in which the stop position error is zero, and the control cost is extremely high.

In order to solve this problem, it is possible to use a stopper to catch the moving body for lifting and lowering at the lower limit position, but in order to reduce the lifting torque, it is possible to When the counterweight is suspended, only the weight of the counterweight acts in the opposite direction on the drive chain at the moment when the moving body for lifting/lowering transfer gets on the lower limit stopper, so the drive torque or braking torque of the drive gear is reduced. Overcoming this, the drive chain rotates in the opposite direction, and the lifting/lowering conveyance moving body is slightly lifted as if bouncing. Therefore, it is impossible to stop the moving body for elevating and lowering conveyance in a state where it is received by the lower limit stopper.

(Means for Solving the Problems) The present invention proposes an elevating conveyance device capable of solving the conventional problems as described above. A lower limit stopper is provided to receive the lift, and the lifting drive chain and the lifting conveyance moving body are connected via a spring that biases the chain in a direction to draw the chain toward the lifting conveyance moving body. When the counterweight is received by the lower limit stopper, the biasing force of the spring is configured to pull up the counterweight.

(Function) In the configuration of the present invention as described above, when the moving body for lifting/lowering conveyance is suspended by the chain for driving lift/lowering, the spring is bent by the weight of the moving body for lifting/lowering conveyance. When the elevating conveyance moving body is moved downward and received by the lower limit stopper, the restoring force of the spring acts to lift the counterweight via the elevating drive chain. Therefore, even if the lifting torque or braking torque that drives the chain is small, the weight of the counterweight will not pull the moving body for lifting and lowering upward, and the moving body for lifting and lowering will be caught by the lower limit stopper. can be stopped stably.

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

In FIGS. 1 and 2, reference numeral 1 denotes a moving body for elevating and conveying, and a pair of left and right elevating guide columns 2a,
Lifting members 3 supported by 2b so as to be movable up and down, respectively.
a, 3b, an elevating frame 4 that connects both elevating members 3a, 3b, and a guide rail 5 for an elevating conveyor line supported on this elevating frame 4. 6 is a guide rail for a low level conveyor line, and 7 is a guide rail for a high level conveyor line.

The moving body 1 for elevating and lowering conveyance is suspended by a pair of left and right main chains 8 and an auxiliary chain 9, respectively. These chains 8 and 9 are connected to the lifting guide column 2
Upper frame 10 installed between the upper ends of a and 2b
Suspended from a pair of left and right drive gear wheels 12 and 13, respectively, which are fixed to a drive shaft 11 supported above,
The other end is a counterweight 14a, 14b that is loosely fitted into each lifting guide column 2a, 2b so as to be able to rise and fall freely.
is connected to. 15 is a motor with a brake that rotates the drive shaft 11 in any forward or reverse direction, and is installed on the upper frame 10.

16a, 16b and 17a, 17b are lower limit stoppers, and when the elevating conveyor moving body 1 is located at the lower limit position where the elevating conveyor line guide rail 5 connects with the low level conveyor line guide rail 6, one Lower limit stopper 16
a, 16b are attached to the elevating guide column 2 so as to receive the elevating members 3a, 3b, and the other lower limit stoppers 17a, 17b are attached to the elevating frame 4.
The fixed frame 18a receives both ends of the
18b.

Reference numerals 19a and 19b are upper limit stoppers, and when the elevating conveyor moving body 1 is located at the upper limit position where the elevating conveyor line guide rail 5 connects with the high level conveyor line guide rail 7, each elevating member 3a, Support members 20a, 20 are attached to the upper frame 10 so as to contact the upper end of 3b.
It is attached via b.

The connection structure between the main chain 8 and the auxiliary chain 9 and the moving body 1 for lifting/lowering conveyance is shown in FIG.
That is, the main chain 8 and the auxiliary chain 9 are separately connected to the upper ends of two hanging bolts 22 passing through the upper plate 21 of each of the lifting members 3a and 3b via a connecting member 23, and the hanging bolts 22 for,
A pair of upper and lower concave and convex spherical washers 24 and 25 are loosely fitted on the lower side of the upper plate 21 and fit into surface contact with each other, and a nut 26 and a lower convex spherical washer 25 are screwed to the lower end. Between each hanging bolt 22
A compression coil spring 27 is loosely fitted in the.
28 is a spring receiving flat washer, and 29 is a lock nut.

The total weight of the counterweights 14a and 14b is slightly lighter than the total weight of the moving body 1 for lifting and lowering, and the compression coil spring 27
The biasing force is applied to the hanging bolt 22 when the moving body 1 for lifting/lowering is received by the lower limit stoppers 16a, 16b and 17a, 17b.
The counterweights 14a and 14b can be lifted via the main chain 8 and the auxiliary chain 9 within the movable range of the counterweights 14a and 14b.

According to the above configuration, by rotating each drive gear 12, 13 by the motor 15, the moving body 1 for elevating and lowering conveyance is moved up and down along the elevating guide columns 2a, 2b via the main chain 8 and the auxiliary chain 9. It can be moved. At this time, the main chain 8 and the reinforcing chain 9 are connected to the movable body 1 and the counterweight 14 in the direction in which the movable body 1 for lifting/lowering conveyance descends.
Since only a load corresponding to the weight difference between a and 14b is acting, the elevating conveyance moving body 1 can be raised with a small amount of driving torque.

When the ascending and descending conveyor moving body 1 reaches the upper limit position where it contacts the upper limit stoppers 19a and 19b, the drive of the motor 15 is stopped and the brake is activated, so that the guide rail 5 for the ascending and descending conveyor line is moved to the high level conveyor. The movable body 1 for elevating and lowering conveyance can be stopped and held while connected to the line guide rail 7.

Further, when the movable body 1 for elevating and conveying is lowered, the movable body 1 reaches the lower limit stoppers 16a, 16.
b, 17a, 17b, the driving of the motor 15 is stopped and the brake is activated, and the vertical conveyance is carried out with the vertical conveyor line guide rail 5 connected to the low level conveyor line guide rail 6. The mobile body 1 can be stopped and held. At this time, the weight of the movable body 1 for elevating and descending transport no longer acts on the main chain 8 and the auxiliary chain 9, but the restoring force of the compression coil spring 27, which had been compressed by the weight of the movable body 1 for elevating and descending, moves the movable body 1 for elevating and descending. The main chain 8 and the auxiliary chain 9 are pulled instead of the weight of the body 1, and the counterweights 14a and 14b are lifted within the movable range of the hanging bolt 22. That is, even when the movable body 1 for vertical conveyance is received by the lower limit stoppers 16a, 16b and 17a, 17b, the movable body 1 for vertical conveyance is in the middle of descent in the main chain 8 and the auxiliary chain 9. When the load acts in the same direction as when the main chain 8
Also, the auxiliary chain 9 does not rotate in the opposite direction and the movable body 1 for elevating and descending conveyance is not lifted up slightly as if bouncing, and the movable body 1 for elevating and conveying is not lifted up by the lower limit stoppers 16a, 16b and 17a, 17b. It can be accepted stably.

(Effects of the Invention) As described above, according to the elevating conveyance device of the present invention,
Although it is equipped with a counterweight that greatly reduces the lifting driving torque of the moving body for lifting and lowering conveyance, the moving body for lifting and lowering conveyance can be stably stopped and held by receiving it with the lower limit stopper. Therefore, it is possible to accurately stop the moving body for elevating and lowering conveyance at the lower limit position, and the control for this purpose is extremely simple and easy, and can be implemented at low cost.

[Brief explanation of the drawing]

FIG. 1 is an overall front view, FIG. 2 is a side view of the same, and FIG. 3 is an enlarged partial longitudinal sectional front view of important parts. DESCRIPTION OF SYMBOLS 1... Moving body for elevating and lowering conveyance, 2a, 2b... Elevating guide column, 8... Main chain, 9... Auxiliary chain, 12, 13... Drive gear, 14a, 14b...
... Counterweight, 15 ... Motor with brake, 16a, 16b, 17a, 17b ... Lower limit stopper, 22 ... Hanging bolt, 24,
25... A pair of upper and lower uneven spherical washers, 27... Compression coil spring.

Claims (1)

[Claims] 1. An elevating conveyance device comprising a movable body for elevating and descending that is supported by a guide column so as to be movable up and down, and a chain that connects the movable body for elevating and conveying and a counterweight is suspended from a drive gear wheel interlockingly connected to a motor. A lower limit stopper is provided to receive the moving body for lifting and lowering conveyance at a lower limit position, and the chain and the moving body for lifting and lowering are connected via a spring that biases the chain in a direction toward the moving body for lifting and lowering. an elevating and lowering conveyance device configured such that when the movable body for elevating and lowering conveyance is received by the lower limit stopper, the biasing force of the spring pulls up the counterweight.