JPH0651469B2 - Power and free conveyor climbing slope waiting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a climbing slope waiting device in a power and free conveyor.

<Prior Art> As is well known, a power-and-free conveyor has a power rail extending in the transport direction and a free rail extending in parallel above the power rail, and is provided with a carrier for carrying a transported object. A power chain equipped with a chain dog that guides the free rail so that the carrier can travel, and that keeps an upright state by its own weight and engages with a carrier dog provided on the carrier to travel the carrier is enabled. It is a guided structure.

<Problems to be Solved by the Invention> The power-and-free conveyor is not necessarily installed flatly, and as shown in FIG. There is a case where the work etc. is transported to 2. In such a case, the first factory 1 and the second factory 2
The power-and-free conveyor, which is bridged between and, is composed of an ascending slope portion 3 and a horizontal portion 4.

In such a power-and-free conveyor, generally, the carrier is not made to stand by in the course of a heavy load and a steep climbing path. The reason for this is that if some external force is applied to the chain dog that is being guided by the power rail during the climbing slope, the chain dog will come off from the carrier dog, and the carrier will drop due to its own weight, causing an accident.
Therefore, conventionally, as shown in FIG. 5, the distance L between the power rail 5 and the free rail 6 of the climbing slope portion 3 is made slightly smaller than that of the horizontal portion 4 so that the chain dog does not come off from the carrier dog even when an external force is applied. There is.

To explain this in more detail, as shown in FIG.
The chain dog 9 attached to the power chain 8 is engaged with the carrier dog 10 provided in front of the carrier by the urging force in the standing direction of its own weight during the general towing in the horizontal portion, but as shown in FIG. When the rear carrier dog 11 comes into contact with the chain dog 9, the chain dog 9 is disengaged from the carrier dog 10 of the trailing carrier. Therefore, in the ascending slope portion 3, by making the distance L between the power rail 5 and the free rail 6 narrower than the horizontal portion, the rear carrier dog 11 of the preceding carrier hits the flat surface 12 of the chain dog 9 as shown in FIG. They are in contact with each other, and this portion interferes with each other to prevent the chain dog 9 from rotating in the direction of releasing the engagement from the carrier dog 10.

Therefore, the operation in the climbing slope section 3 is performed after confirming that the preceding carrier 7a is not present in the horizontal section 4 and then the succeeding carrier.
7b is being started, the starting intervals of carriers are increasing, and multiple carriers are stagnating at the starting point, which affects efficient transportation.

<Means for Solving the Problems> The present invention is an improvement over the above-mentioned conventional problems, and a characteristic feature of the present invention is that the power rail extending in the conveying direction is parallel to the upper side of the power rail. And a free rail that extends so as to guide a carrier carrying a conveyed object to the free rail so that the power rail keeps an upright state by its own weight and a carrier dog provided on the carrier. In a power and free conveyor in which a power chain equipped with a chain dog that engages and travels a carrier is guided so that it can travel,
In the same way as the power rail, a recess is formed in a part of the power rail in the middle of the climbing of the free rail so as to be spaced apart from the free rail, and in this recess, the chain dog is pushed down to release the engagement with the carrier dog. Installed so that it can move forward and backward in the direction orthogonal to the direction of travel of the chain,
A hook for preventing a drop is provided at a rear end portion of the carrier with respect to the moving direction, and a track rail for obtaining a synchronous track with the hook is provided on a climbing slope of the power rail and the free rail below the stopper installation position. Provided on this track rail, a loop-shaped chain is arranged so that it can go around in the same direction as the running of the power chain through a sprocket with a one-way clutch. A synchronizing claw that engages to move the chain in a synchronous orbit and a fall preventing claw that engages with the hook to prevent the carrier from falling backward are attached at a predetermined pitch.

<Operation> With the above structure, the chain dog is disengaged from the carrier dog by the stopper in the middle of the climbing slope, and the chain is synchronously moved only in the ascending direction of the carrier by the synchronizing claw that engages with the hook for fall prevention. In addition, the fall prevention claw is engaged with the hook to allow the carrier to stand by while climbing the slope.

<Examples> Examples of the present invention will be described below with reference to FIGS. 1 to 3. In FIG. 1, 3 is an ascending slope portion of the power and free conveyor, and 4 is a horizontal portion. Reference numeral 5 is a power rail, and a power chain 8 is guided so that it can travel as in the conventional case shown in FIG. 5, and chain dogs 9 for holding the standing state by its own weight are attached to the power chain 8 at regular intervals. . Reference numeral 6 denotes a free rail, which guides the carrier 7 so that it can travel. This carrier 7 is engaged with the chain dog 9 in the same manner as in the conventional case.
It has 10 and a rear carrier dog 11. W is a conveyed product such as a workpiece mounted on the carrier 7.

The carrier 7 climbing up the ascending slope portion 3 travels toward the horizontal portion 4 with the chain dog 9 engaged with the front carrier dog 10.

Therefore, the present invention uses the power rail 5 in the middle of the climbing slope portion 3.
A recess 5a is formed in a part of the recess 5a so as to be spaced apart from the free rail 6, and a stopper device 13 for releasing the engagement of the chain dog 9 with the front carrier dog 10 is formed in the recess 5a. A fall prevention device 17 is installed.

As shown in FIG. 2, the stopper device 13 has a stopper plate 15 that moves forward and backward between the power rail 5 and the free rail 6 of the recess 5a on the base 14, and a cylinder that moves the stopper plate 15 forward and backward. It is a structure with 16 and.

The structure of the carrier drop prevention device 17 is as follows.
First, a hook 18 for preventing a drop is provided at the rear end of the carrier 7.

Further, a track rail 23 for obtaining a synchronous locus with the hook 18, a front sprocket 20, a rear sprocket 21, and a one-way clutch that allows only forward rotation are provided on a frame 19 installed on the side of the power rail 5 and the free rail 6. A built-in intermediate sprocket 22 is provided. Then, a loop-shaped chain 26 is stretched over these sprockets 20, 21 and 22 and guided by the locus 23 to carry the carrier 7.
Orbit only in the forward direction. The chain 26 has a structure in which a drop preventing claw and a synchronizing claw 25 are attached at a constant pitch.

Next, the operation of the present invention will be described. Power chain 8
When the chain dog 9 is engaged with the front carrier dog 10 and the carrier 7 travels up the slope 3, when the stopper plate 15 is located at the retracted end, the hook 18 provided at the rear end of the carrier 7 When it hits the carrier drop prevention device 17, it abuts on the synchronizing claw 25 as shown in FIG. 3 (A), and the chain 26 is synchronized with the movement of the carrier 7 along the track rail 23 to the right in FIG. Move it. And
At the right end of the track rail 23, the synchronization claw 25 has the front sprocket 20.
The hook 18 is released from the contact because it descends toward the horizontal direction, and the carrier 7 passes through the carrier drop prevention device 17 to pass through the horizontal portion 4.
Move to.

When the carrier 7 is stopped in the middle of the climbing slope portion 3 and stands by, the stopper plate 15 is moved to the forward end. Until the chain dog 9 engaged with the front carrier dog 10 of the carrier 7 advances to the position of the stopper plate 15 due to the forward movement of the stopper plate 15, the hook as shown in FIG. 18 contacts the synchronizing claw 25 at the left end of the trajectory rail 23 and moves the chain 26 synchronously with the carrier 7. Then, at the point B, the hook 18 is used for the synchronization nail 25.
Finish with the fall prevention claw 24. Immediately after that, that is, when the chain dog 9 moves to the point C, the chain dog 9 hits the stopper plate 15 to disengage the chain dog 9 from the carrier dog 10, the power chain 8 and the carrier 7 are separated, and only the power chain 8 travels. On the other hand, the carrier 7 separated from the power chain 8 is subjected to self-gravitational force to retreat the climbing slope portion 3 downward, but at the point C, the hook 18 engages with the fall preventing pawl 24, and the chain 26 is an intermediate sprocket with a one-way clutch 22
Since the reverse rotation movement is blocked by, the carrier 7 is supported by the hook 18 and the fall preventing claws 24 to prevent the carrier 7 from falling downward, and stops and stands by in the middle of the climbing slope portion 3.

When the stopper plate 15 is moved to the retracted end in order to resume the progress of the carrier 7 waiting, the chain dog 9 of the power chain 8 which is constantly proceeding engages with the front carrier dog 10 toward the horizontal portion 4. When the carrier 7 is moved, the hook 18 is moved to the right end of the track rail 23 and the hook 18 is used for synchronization.
Release the contact with 25.

<Effects of the Invention> As described above, according to the present invention, the carrier and the power chain are disconnected from each other in the climbing slope portion, and the carrier fall prevention device enables standby by stopping halfway. Is effectively used, the advance interval at the carrier starting portion can be shortened, and the transport efficiency is improved. In addition, even if the chain dog comes off the carrier dog for some reason, the carrier is prevented from falling in the middle of the ascending slope by the fall prevention device with the fall prevention pawl provided on the chain that can be rotated only by the one-way clutch sprocket in the climb direction of the carrier. Therefore, safety is secured.

Further, since the chain of the fall prevention device is configured to use the ascending movement force of the carrier to cause the synchronizing claw to move up and down synchronously with the carrier, a dedicated drive source is not required, resulting in energy saving and cost reduction. Has the effect of being obtained.

[Brief description of drawings]

Fig. 1 is a side view showing the device of the present invention, and Fig. 2 is Fig. 1 II-.
A sectional view taken along the line II, FIG. 3 is an operation explanatory view of the carrier fall prevention device, FIG. 4 is an explanatory view of a conveyor transportation path having an ascending slope portion, and FIG. 5 is a configuration diagram of a conventional ascending slope portion, FIG. 6 is a diagram showing the horizontal part of the power and free conveyor when it is generally towed, FIG. 7 is an explanatory diagram of the disengagement prevention action of the chain dog in the conventional climbing slope part, and FIG. 8 is the case where the chain dog comes into contact with the preceding carrier. FIG. 3 ... climbing slope part, 4 ... horizontal part, 5 ... power rail, 6 ... free rail, 7 ... carrier, 8 ... power chain, 9 ... chain dog, 10 ... front carrier dog, 13 ... Stopper device, 15 …… Stopper plate,
16 …… Cylinder, 17 …… Carrier drop prevention device, 18 ……
Hook, 20 …… front sprocket, 21 …… rear sprocket, 22 …… intermediate sprocket with one-way clutch,
23 …… Track rail, 24 …… Fall prevention claw, 25 …… Synchronization claw, 26 …… Chain.

Claims (1)

[Claims] 1. A power rail extending in the conveying direction and a free rail extending in parallel above the power rail are arranged to guide a carrier carrying a conveyed object to the free rail so that the carrier can travel. A power-and-free conveyor in which a power chain having a chain dog that holds an upright state by its own weight and engages with a carrier dog provided on the carrier to move the carrier is movably guided Forming a recess in the power rail and a part of the power rail in the middle of the ascending slope of the power rail so as to be spaced apart from the free rail, and in this recess, a stopper for inclining the chain dog to release the engagement with the carrier dog is provided. It is installed so that it can move forward and backward in a direction orthogonal to the direction of travel of On the other hand, a fall prevention hook is provided at the rear end of the power rail and a trail rail for obtaining a synchronizing trail with the hook is provided on the trail rail along the ascending slope of the power rail and free rail below the stopper installation position. A loop-shaped chain is rotatably arranged through a sprocket with a one-way clutch only in the same direction as the running of the power chain, and the chain is engaged with the hook of the carrier that moves in the ascending direction on the chain. A climbing slope waiting device for a power-and-free conveyor, characterized in that a synchronizing pawl that moves in a synchronous orbit and a fall preventing pawl that engages with the hook and prevents the carrier from falling backward are attached at a predetermined pitch.