JPS6144773B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is an automatic transfer synchronization system for loading or unloading cargo in synchronization with the transfer speed of the conveyor while a cargo handling machine such as a trolley conveyor is in operation. Regarding equipment.

You can load cargo onto a conveyor line such as a trolley conveyor while it is in operation without stopping it, or
The need for loading and unloading often arises, and various devices have been developed for this purpose. One of these uses a DC servo mechanism, but this has the drawbacks of a complicated electric circuit and high cost. A system in which the conveyor is connected to a conveyor line and moved is also known, but this has the disadvantage that it places an extra load on the conveyor line and is likely to cause pulsation, which can be fatal to the conveyor. A third known method is to follow the synchronization target while pushing it, and remove the excess power with a torque limiter, but this method requires great care and skill in adjusting the torque. However, the reality is that neither of these methods has achieved satisfactory results due to drawbacks such as the short lifespan of the torque limiter.

The present invention has developed a new synchronizing device which eliminates all the drawbacks of the conventional type, has a simple structure, operates reliably, and does not require any special adjustment work. In other words, the present invention makes active use of the self-locking action (self-locking action), which is one of the characteristics of the worm gear, and is essential for synchronizing the transport line and the cargo transfer device. This mechanism is incorporated into the transfer device so that the transfer device can be driven in complete synchronization with the transfer line without causing any pulsations in the transfer line. In other words, in a device for transferring cargo from a conveyance line to another branch line, etc., a separately provided endless chain is driven by the conveyance line via a sensing bar,
The driving force is received by the worm shaft of the worm gear device. On the other hand, the main body of the transfer device is driven parallel to the transfer line by a pneumatic or hydraulic cylinder, and its driving force (thrust)
is transmitted to a rack attached to the main body and a pinion having a reverse rotation prevention mechanism, and a worm wheel meshing with the worm shaft is fixed to the pinion shaft. In this way, only when rotation is transmitted from the worm wheel to the pinion shaft, only the amount of momentum (amount of rotation)
The thrust of the transfer device body works, and when it is not, the worm gear plays the role of a brake and stops the movement of the transfer device, so the transfer device is driven in complete synchronization with the transfer line. This makes it possible to prevent the device from escaping.

To specifically explain the present invention based on one embodiment shown in the drawings, FIGS. 1 to 3 show a case where a cathode ray tube B is conveyed by a conveyance line (a trolley conveyor in the illustrated example), and the present invention is applied to this conveyance line. An example of incorporating a synchronization device is shown below. In the figure, 1 is a guide rail of a trolley conveyor, which is a transport line, and 2
1 is a trolley conveyor running within the guide rail 1, 3 is a load-hanging fitting attached to the trolley-chain 2, and 4 is a hanger for hoisting a cathode ray tube attached to the load-hanging bracket.The trolley conveyor itself has been well known for a long time. It is of structure.

The synchronizing device of the present invention can be installed at any point in the conveyance line formed by the trolley conveyor as described above, that is, at a point where it is necessary to load or unload cargo from or to the line. Incorporate. Hereinafter, the synchronizing device of the present invention will be described. As shown in the figure, a machine frame 12 supported by a bridge groove 11 is attached along a guide rail 1 of a trolley conveyor. A pair of front and rear sprocket wheels 14, 14' is projected from the side surface of the machine frame via a bracket 13, and an endless chain 15 is suspended from the sprocket wheels. As clearly shown in Figure 1, the tensioning position of this chain should be at a height that intersects the perpendicular line of the load hanging bracket 3, and the chain should be directed outward as shown in Figures 2 and 3. A sensing bar 16 is attached so as to extend horizontally. Note that the protruding length of this sensing bar is such that it crosses the trolley chain 2 of the trolley conveyor, as shown in Fig. 3.
When the load hanging fitting 3 or hanger 4 suspended from the chain moves as the trolley chain moves, the sensing bar 16 is moved to a position pushed by the fitting 3 as shown in FIG. Set to relationship. By the way, the code is 17, 17'
A bearing is attached to the bracket 13, and is a member that supports the sprocket wheel. For the sprocket wheel 14, a speed increaser 20 is attached to the wheel shaft, for example, via an electromagnetic clutch 18 and a shaft joint 19, and a worm gear device 21 is attached to the end of the shaft. do. The worm gear device 21 consists of a worm shaft 21a and a worm wheel 21b, as shown in an enlarged view in FIG. In the present invention, this worm gear device 21
By utilizing this, the interlocking mechanism after the sprocket wheel 21b is allowed to move in the synchronous direction by a movement proportional to the amount of rotation (momentum) given to the sprocket wheel 21b. First, machine frame 12
A pair of left and right relays 22, 22 are laid on the top surface of the
A traveling carriage 24 having wheels 23 is mounted on this rail. A rack 2 is provided on one side of the traveling carriage 24.
5, and a pinion 26 attached to the shaft of the worm wheel 21b is engaged with this rack. The pinion 26 is a freewheel equipped with a reverse rotation prevention mechanism, an example of which is shown in FIG. As is clear from the figure, a roller clutch mechanism 29 is built in between the outer ring 27 and the inner ring 28 of the pinion 26, so the wheel 26 rotates freely in the direction of the arrow shown by the solid line. , even if an attempt is made to rotate in the direction of the dotted arrow, the roller clutch 29 gets caught and the rotation does not occur in that direction. In the present invention, a pinion 26 having the above configuration is used.
is provided coaxially with the worm wheel 21b.

By the way, as a drive source for the traveling truck 24, for example, a traveling cylinder 30 for traveling the truck is installed between the traveling truck and the machine frame 12, and the cylinder 30 is responsible for the traveling of the truck.
On the other hand, a small traversing truck 31 is incorporated into the traveling truck 24, and a traversing cylinder 32 is also attached to this traversing truck 31, so that it can move in the left and right direction. As clearly shown in FIG. 4, an elevating frame 34 having an elevating cylinder 33 is attached to the traversing truck 31, and a suction pad 36 is provided at the lower part of the elevating frame 34 via an arm 35. ing. Further, as shown in FIG. 2, a conveyor 37 is installed on the lower surface of the machine frame 12, and a cargo receiving stand 38 is provided on the conveyor 37. In addition, reference numeral 3 is shown in Figure 1.
9 is a photoelectric device for detecting the load hanging bracket 3 or the load B suspended from the bracket, and the detection signal causes the electromagnetic clutch 1 to be activated.
8 comes into play. In the above apparatus, when the trolley chain 2 serving as a conveyance line runs and the metal fitting 3 suspended from the chain moves, the metal fitting 3 is placed on the sensing bar 16 of the endless chain 15 installed parallel to the chain 2. It hits from behind, and then this metal fitting 3 moves while pushing the sensing bar. When this happens, the endless chain 15 is also rotated by the sensing bar, so the sprocket wheels 14, 14' are also rotated, and the electromagnetic clutch 18, shaft joint 19, and amplifier attached to the shaft of the wheel 14 are rotated. Rotation is transmitted to the worm shaft 21a of the worm gear device 21 via the worm gear 20. Note that the electromagnetic clutch 18 is
Detector 3 provided at the front stage of the transfer device of the present invention
It is activated by the detection signal of 9. That is, to explain using the illustrated example, when the carry-in of baggage B is detected, the electromagnetic clutch 18 is closed, and at the same time, air or pressure oil is fed into the traveling cylinder 30, and the traveling trolley 24 becomes in a traveling state. Incidentally, a rack 25 is formed on the side surface of the traveling carriage 24, and a pinion 26 meshes with this rack.
Since b is fixed, even if the traveling carriage 24 tries to travel by the driving force of the cylinder, the pinion 26 will not rotate unless the worm shaft in the worm device rotates, and therefore the traveling carriage 24 will not move. In other words, as long as the worm shaft 21a does not rotate with the rotation of the endless chain 15, the pinion will not rotate either and the worm shaft will be in a braking state, so to speak. The present invention actively utilizes the braking function unique to the worm gear device as described above, and only when the endless chain 15 is moved by the driving force for conveying the load B, Since the worm shaft also rotates, the carriage 24 can always be moved in synchronization with the movement of the cargo.

That is, in the above braking state, when the worm shaft 21a in the worm gear device 21 rotates,
Since the rotation is released by the amount of rotation, when the endless chain 15 moves forward via the sensing bar 16, the traveling carriage 24 also advances due to the thrust of the traveling cylinder 30, and its speed is the same as the speed of the conveying line 1. becomes the same as Thus, the traveling trolley 24
Since it advances in synchronization with the conveyance line, the suction pad 36 attached to the lifting frame 34 is activated by the traversing cylinder 32 disposed on the traveling carriage 24 during that time.
is pushed into the hanger 4, and the suction pad 36 is lowered and raised as appropriate by the lifting cylinder 35 to pick up the cathode ray tube B, which is the cargo.
This is transferred to a loading platform 38 provided on a conveyor 37. When the automatic transfer of the cargo onto the loading platform 38 is completed in this way, the traveling cylinder 30 is moved in the opposite direction to that during synchronous traveling.
The traveling carriage 24 is returned to its original position. This return operation is carried out smoothly because the pinion 26 that engages with the rack 25 formed on the traveling carriage 24 is configured to freely rotate in the opposite direction, that is, in the direction of the arrow shown by the solid line in FIG. .
That is, since the roller clutch 29 incorporated in the pinion 26 is not engaged in the direction of the solid arrow, the pinion 26 rotates freely as long as the carriage 24 moves in the return direction with the thrust of the cylinder 30, and the return is not completed. It completes the action. When the synchronous running is completed, the magnetic clutch 18 opens and the sprocket wheels 14, 1 of the endless chain 15 are opened.
Since the sensing bar 4' idles independently of the worm shaft 21a, even if the sensing bar 16 comes into contact with the load hanging fitting 3 of the trolley conveyor and is pushed, there is almost no effect on the conveyance line.

The above-mentioned speed increaser 20 is used to match the traveling speed of the trolley chain 2 and the transport speed of the traveling carriage 24, and is used to correct the reduction ratio of the worm gear device 21 and the difference in diameter between the sprocket 14 and the pinion 26. . Incidentally, in the embodiment of the present invention, the worm shaft 21a side of the worm gear device 21 is rotated at an increased speed, but the same effect can be obtained by increasing the speed of the worm wheel 21b side. There is no harm in installing a speed gear.

It goes without saying that a pneumatic or other fluid pressure cylinder may be used as the drive source for the traveling carriage 24, and a fluid motor may also be used. Furthermore, in this embodiment, the electromagnetic clutch 18 is used as a means for preventing idle movement of the synchronizer, that is, as a load B.
When the load is not suspended, even if the endless chain 15 rotates, the worm shaft 21a
is equipped with a means to disconnect power transmission to prevent rotation. However, the electromagnetic clutch described above is not essential to the present invention, and the invention can be carried out even if the clutch is not provided, so the presence or absence of the clutch does not matter.
Furthermore, in this embodiment, the pinion 26 has been described as a freewheel equipped with a reverse rotation prevention mechanism, but instead of this, a clutch that engages only in one direction may be used.

As described above, according to the present invention, when the worm shaft of the worm gear device 21 rotates, the traveling carriage 24, which has been kept in a stopped state, is pushed by the cylinder 30, and moves at a speed proportional to the rotational speed of the worm shaft. Run. Therefore, trolley conveyor chain 2
When the speed of the worm shaft changes, the change is transmitted through the transmission path described above, and the rotational speed of the worm shaft also changes, so a perfect synchronized state is always achieved.Compared to conventional synchronizers, it has the following advantages: Demonstrate.

Compared to the conventional electric type, the configuration is simple, so it can be manufactured at an extremely low cost, resulting in significant cost savings.

Since there is little external force applied to the synchronization target, there is no risk of pulsation occurring in the conveyance line.

Since it has a small number of parts and is purely mechanical, it operates reliably and is easy to maintain.

Since the synchronous running body (traveling carriage) is connected to the worm shaft of the worm gear device via a reverse rotation prevention mechanism or a clutch that engages only in one direction, the synchronous running body can easily return quickly.

In addition, in the specific explanation of the present invention, the case of loading and unloading cargo has been illustrated and described, but according to the present invention, it is also possible to automatically load cargo onto a conveyance line by a similar operation. be.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of the synchronization device according to the present invention, and an explanatory diagram showing a part thereof enlarged is added. FIG. 2 is a front view of the same device, FIG. 3 is a plan view of a part of the same, FIG. 4 is a plan view of the traveling truck, and FIG. 5 is an enlarged explanatory view of the rack and pinion. 1...Annai rail, 2...Torolichen, 3...
...Load hanging bracket, 4...Hanger, B...Luggage (cathode ray tube), 11...Frame, 12...Machine frame, 13
... Bracket, 14, 14' ... Sprocket wheel, 15 ... Chain, 16 ... Sensing bar, 17, 17' ... Bearing, 18 ... Electromagnetic clutch, 19 ... Shaft joint, 20 ... Speed increase Machine, 21...
... Worm gear device, 21a ... Worm shaft, 2
1b... Worm wheel, 22... Rail, 2
3...Wheel, 24...Traveling trolley, 25...Rack, 26...Pinion, 27...Outer wheel, 28...
Inner ring, 29... Roller clutch mechanism, 30... Traveling cylinder, 31... Traversing truck, 32... Traversing cylinder, 33... Lifting cylinder, 34...
Lifting frame, 35...Arm, 36...Suction pad, 37
... Conveyor, 38 ... Receiving platform, 39 ... Detector (photoelectric device).

Claims (1)

[Claims] 1. A worm shaft in a worm gear device is installed on the side of a sprocket wheel shaft on which an endless chain equipped with a sensing bar is suspended, and on the other hand, a worm shaft is installed on the side of a worm wheel that meshes with the worm shaft. , a pinion having a reverse rotation prevention mechanism or a clutch that engages only in one direction is installed, this pinion is engaged with a rack formed on the traveling truck, and the traveling truck is driven by a hydraulic cylinder or other driving source. A synchronizing device characterized in that the running state of the traveling bogie in the synchronizing direction is braked by the worm gear device. 2. The synchronizing device according to claim 1, wherein an electromagnetic clutch is interposed between the sprocket wheel shaft and the worm shaft. 3. The synchronizer according to claim 1, wherein the pinion is a freewheel having a reverse rotation prevention mechanism. 4. The synchronizing device according to claim 1, wherein a speed increaser is attached to the worm shaft or the worm wheel side of the worm gear device, either separately or on either side.