JPH0651468B2 - Downhill standby device for power and free conveyor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a descending slope standby 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 always installed in a flat manner, and as shown in FIG. 8, the second factory 2 having a high height apart from the first factory 1 having a low height There is a case where a work or the like is reciprocated between and. In such a case, the power-and-free conveyor spanned between the first factory 1 and the second factory 2 is composed of the slope section 3 and the horizontal section 4.

In such a power-and-free conveyor, in general, the carrier is not allowed to stand by during a heavy load, steep downhill path. The reason for this is that if some force is applied to the chain dog that is being guided by the power rail during the downward 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. 9, the distance L between the power rail 5 and the free rail 6 of the slope portion 3 is made slightly narrower 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. .

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 due to its own weight during the general towing in the horizontal portion, but as shown in FIG. The rear carrier dog 11 is positioned so as to be able to rise and fall so as to face the chain dog 9, restricts the rotation of the chain dog 9 from the carrier dog 10 in the direction for releasing the engagement, and pushes the chain dog 9 in the direction for releasing the engagement. When it comes into contact with the pawl dog 9a, the pawl dog 9a pushes the chain dog 9 in the direction of disengaging the chain dog 9 from the carrier dog 10, and the chain dog 9 disengages from the carrier dog 10 of the succeeding carrier. Therefore, in the slope portion 3, the distance L between the power rail 5 and the free rail 6 is made narrower than that in the horizontal portion, so that the rear carrier dog 11 of the preceding carrier hits the flat surface 12 of the pawl dog 9a 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 in which the engagement is released from the carrier dog 10.

Therefore, in the operation of the conveyor on the descending slope path of the slope part 3, after confirming that the preceding carrier 7b is not seated on the lower side of the slope part 3, the trailing carrier 7a on the higher side of the slope part 3 is started. Therefore, the starting intervals of the carriers are increased, and a plurality of carriers are stagnant at the starting point, which affects efficient transportation.

<Means for Solving the Problems> The present invention has improved the above-mentioned conventional problems, and its characteristic configuration is that a power rail extending in the conveying direction and a power rail extending parallel to the upper side of the power rail are provided. And a free rail that extends along the guide rail 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 engages with a carrier dog provided on the carrier. A chain dog that moves the carrier together to move it, and a chain dog that is arranged so as to be able to move up and down so as to face the chain dog. In a free and power conveyor in which a power rail with a moving claw dog is guided so that it can travel,
A recess is formed in a part of the power rail in the middle of the descending slope of the power rail and the free rail so as to be spaced apart from the free rail, and in this recess, the recess is formed in a standing state with the claw dog traveling downward on the descending slope. The carrier dog drop prevention plate that allows the carrier dog to pass through and engages the claw dog to prevent the carrier from falling by its own weight, and the chain dog is tilted in the recess to release the engagement with the carrier dog, and contact the carrier dog. A carrier having a stopper member for stopping the downward movement of the carrier, and the dead weight fall prevention plate and the stopper member are alternately moved forward and backward by an actuator in a position of the recess in a direction orthogonal to the extending direction of the power rail. Stopping due to its own weight drop prevention and halfway stop mechanism, and the carrier's own weight fall prevention and halfway stop mechanism It abuts on the carrier dog of the stopped carrier, the contact with the carrier dog is released by retreating the stopper portion, and the carrier dog is started until the chain dog engages with the carrier dog by the advance of the self-weight fall prevention plate and starts the carrier again. And a carrier restart mechanism for restraining the downward movement.

<Operation> When the carrier does not need to wait in the middle of the downward slope due to the above configuration, the engagement between the chain dog and the carrier dog is maintained, and the pawl dog prevents the carrier from falling due to its own weight, and the carrier is powered. Pull the chain down to drive it down. Further, when the carrier is stopped and waits in the middle of the downhill, the carrier is prevented from dropping by its own weight and the stopper member of the intermediate stop mechanism is moved forward to the recess of the power rail.
The carrier's own weight drop prevention plate is retracted and separated from the recess,
The stopper member disengages the chain dog from the carrier dog and prevents the carrier from descending its own weight.
Furthermore, when the carrier stopped midway is restarted, the carrier receding mechanism restrains the downward movement of the carrier, the carrier weight drop prevention plate is advanced to the recess, and the stopper member is retracted and separated from the recess, When the chain dog engages with the carrier dog and the carrier starts to move, the downward movement restraint of the carrier by the carrier re-starting mechanism is automatically released.

<Example> An example of the present invention will be described below with reference to FIGS. 1 to 7. In FIG. 1, 3 is a down-gradient part of a power and free conveyor, 5 is a power rail, and 6 is a free rail. A power chain 8 is guided along the power rail 5 in the same manner as in the conventional case shown in FIG. 10, and a chain dog 9 that holds the standing state by its own weight and a chain dog 9 that can be erected while facing the chain dog 9 are provided. Positioned, a chain dog 9 is attached to the carrier dog 10 at a constant interval with a pawl dog 9a that restricts the rotation in the direction for releasing the engagement and pushes the chain dog 9 in the direction for releasing the engagement. Further, the free rail 6 is provided with a carrier dog 10 in which a carrier 7 is movably guided and the chain dog 9 is engaged. W is a conveyed product such as a workpiece mounted on the carrier 7.

According to the present invention, in the portion II of the descending slope portion 3 viewed from the arrow II, the power rail 5 is provided with a recess 5a which is spaced from the free rail 6, and the carrier self-weight drop prevention and the intermediate stop mechanism 20 and the carrier re-start are described later. The mechanism 21 (see FIG. 3) is installed.

The structure of the carrier self-weight drop prevention and halfway stop mechanism 20 is as follows.

As shown in FIGS. 3 and 4, a base 22 having a guide rod 23 having an axis line orthogonal to the extending direction of the power rail 5 is provided on the ground surface immediately below the recess 5a formed in the power rail 5. A table 24 is fixedly mounted, and slidably guides and supports a table 24 which is moved by a cylinder 27 on the guide rod 23. The power rail 5 is sandwiched between the two columns 2 on this table 24.
5, 5 and 26 are erected, a carrier self-weight drop prevention plate 28 is fixedly mounted on one of the columns 25, and a stopper member 29 is provided on the other column 26. Therefore, when the table 24 is moved to the right in FIG. 3 by the cylinder 27, the carrier weight drop prevention plate 28 advances toward the power rail 5 side and is located in the recess 5a, and the stopper member 29 retracts from the power rail 5. Separate. When the table 24 is moved to the left, the operation opposite to the above is performed and the table is switched to the switching position.

When the carrier gravity drop prevention plate 28 is located in the recess 5a, the recess 5a is filled with the power rail 5 and the free rail 6 so that the recess 5a is flush with the general surface of the power rail 5, as shown in FIG. The claw dog 9a is held upright, and the carrier dog 10 engages with the claw dog 9a to prevent the carrier 7 from falling by its own weight.

The stopper member 29 has a plunger 29a that stops the downward movement of the carrier 7 by contacting the carrier dog 10 at the recess 5a, and also lowers the chain dog 9 downward to bring down the carrier dog 10.
Release the engagement with. Reference numeral 29b is a spring that presses the plunger 29a, and absorbs an impact when the carrier dog abuts.

The structure of the carrier restart mechanism 21 is as follows.

As shown in FIGS. 3, 5, and 7, the carrier is prevented from dropping by its own weight, and the intermediate stop mechanism 20 and the free rail 6 are sandwiched and are installed at positions facing each other. 30 is a support, and a support base 31 is provided on the support 30 at a height substantially equal to that of the free rail 6.
Is fixed, and a guide shaft 33 having an axis line orthogonal to the free rail 6 is installed on the support base 31. A movable body 32 is slidably guided by the guide shaft 33, and a cylinder 34 fixed to the support 31 moves forward toward the free rail 6 and a spring 38 moves backward.

A boss plate 35 is integrally provided on the moving body 32, and a holding roller 36 that comes into contact with the carrier dog 10 moving down the free rail 6 is attached to the tip of the boss plate 35. The holding roller 36 also has a spring 38 for cushioning the carrier dog 10 when it abuts.

When the moving body 32 moves to the forward end in the cylinder 34 and the holding roller 36 is positioned on the traveling locus line of the carrier dog 10, the moving body 32 is held in the forward end position even if the cylinder 34 moves backward, It has a lock and unlock mechanism for moving the moving body 32 backward by the spring 38 when the carrier 7 stopped midway restarts. As shown in FIG. 7 (B), the mechanism is provided with a toggle link 43 on the moving body 32, a lock pin 44 at one end of the toggle link 43, and a guide shaft 33 at the forward end of the moving body 32. Lock pin
A lock groove 45 into which 44 is inserted is formed. A spring 42 is provided at the bending point of the toggle link 43, and the toggle link 43 is pulled by the spring 42 in a linearly extended state. The upper end of the vertical operating shaft 41 is coupled to the bending point of the toggle link 43, and the lever is connected to the lower end of the operating shaft 41.
40 is mounted at right angles. The lever 40 is arranged at a relative position where it extends below the power rail 5 at the forward end of the moving body 32 and comes into contact with a projection shaft 39 projecting below the power chain 8.

Next, the operation of the present invention will be described. When the carrier 7 is not stopped and waits at the descending slope portion 3, as shown in FIG. 6 (A), the moving body 32 of the carrier re-starting mechanism 21 is positioned at the retreat end, the carrier self-weight fall prevention and the halfway stopping mechanism 20 are ,
The carrier weight drop prevention plate 28 is advanced to the power rail 5 side to fill the recess 5a. Therefore, the stopper member 29 is retracted to a position separated from the power rail 5. As a result, the pawl dog 9a is held in the upright state, and when the chain dog 9 passes through the recess 5a, rotation of the carrier self-weight fall prevention plate 28 in the tilting direction is restricted to keep the engagement with the carrier dog 10. The carrier chain 11 is pulled by the power chain 8 and travels on the descending slope portion 3, and the carrier dog 11 is engaged with the pawl dog 9a to prevent the carrier 7 from falling by its own weight.

On the other hand, when the carrier 7 is stopped and waits at the descending slope portion 3, the stopper member 29 is advanced to the power rail 5 side by the operation of the cylinder 27, as shown in FIG. 6 (B).
Therefore, the carrier self-weight drop prevention plate 28 escapes from the recess 5a of the power rail 5 and is switched to the retracted position. This causes the carrier dog with which the chain dog 9 is engaged.
When the carrier 10 comes into contact with the recess 5a, the carrier dog 10 comes into contact with the plunger 29a to stop the carrier 7 from running, and the pawl dog 9a stops when the stopper member 29 passes through.
It interferes with and falls. At this time, the chain dog 9 has the recess 5a.
Since the chain dog 9 is pushed down by the pawl dog 9a and is disengaged from the carrier dog 10, the power chain 8 continues to travel and the carrier 7 descends on the descending slope portion. It stops halfway at 3 and waits.

The following operation is performed in order to restart the carrier 7 waiting in the midway stop. In the standby state shown in FIG. 6 (B), as shown in FIG. 6 (C), the carrier restart mechanism 2
The first moving body 32 is located at the forward end by the cylinder 34.
When the moving body 32 is located at the forward end, the lock pin 44 engages with the lock groove 45, and the moving body 32 compresses the spring 38 and is locked at the forward end position. And immediately the cylinder 34
Is returned to the backward end. In the moving body 32 located at the forward end, the holding roller 36 provided on the boss plate 35 of the moving body 32 contacts the carrier dog 10 to restrain the downward movement of the carrier 7 by its own weight. After that, as shown in FIG. 6 (D), the carrier self-weight drop prevention and halfway stop mechanism 20 is operated, the carrier self-weight drop prevention plate 28 is advanced to the recess 5a, and the stopper member 29 is switched to the retracted position. Although the stopper member 29 retreats from the contact with the carrier dog 10 due to the retreat, the holding roller 36 of the carrier re-advancing mechanism 21 contacts the carrier dog 10, so that the carrier 7 does not drop by its own weight at this point.

Therefore, when the chain dog 9 of the traveling power chain 8 reaches the position of the recess 5a, it engages with the carrier dog 10 to start the downward movement of the carrier 7. This carrier 7
By starting the downward movement of the holding roller 36, the holding roller 36 compresses the spring 37 and overruns as shown in FIG. Due to this overrun 1, the lever 40 is swung in the downward direction of the power rail 5 from the neutral position by the projection shaft 39 that is provided so as to project on the power chain 8. As a result, the operating shaft 41 rotates, the toggle link 43 is bent, the lock pin 44 is pulled out from the lock groove 45, and the lock is released. By this unlocking, the moving body 32 is moved to the retracted end by the compressed spring 38, the holding roller 36 is disengaged from the carrier dog 10, the carrier 7 is allowed to advance, and the carrier 7 is restarted.

<Effects of the Invention> As described above, according to the present invention, in the downward slope portion, the carrier is normally prevented from falling by its own weight, and the carrier is lowered.
The stopper member disconnects the carrier and the power chain from the quick connection, and allows the carrier to stop and wait on the way to prevent the carrier from dropping due to its own weight.The carrier re-starting mechanism allows the carrier to keep its own weight until it is reconnected. Since the structure prevents falling, the down-slope portion is effectively used, the traveling interval of carriers can be shortened, and the transport efficiency is improved. Further, there is an effect that the carrier does not drop due to its own weight when the carrier is stopped halfway or restarted and the safety is ensured.

[Brief description of drawings]

FIG. 1 is a side view showing the device of the present invention, FIG. 2 is a detailed view of a portion shown by an arrow II in FIG. 1, FIG. 3 is a view seen from an arrow III in FIG. 2, and FIG. 4 is an arrow IV-IV in FIG. FIG. 5, FIG. 5 is a view taken in the direction of arrow V in FIG. 2, FIGS. 6 and 7 are explanatory views of the operation of the present invention, FIG. 8 is an explanatory view of a conveyor transport path having a downward slope portion, and FIG. FIG. 10 is a configuration diagram of a conventional downhill portion, FIG. 10 is a diagram showing a horizontal portion of a power and free conveyor when it is generally towed, FIG. 11 is an explanatory view of a chain dog disengagement prevention action in the conventional downhill portion, and FIG. It is explanatory drawing of the problem when a chain dog contacts the preceding carrier. 3 ... Downhill part, 5 ... Power rail, 5a ... Recessed part,
6 ... Free rail, 7 ... Carrier, 8 ... Power chain, 9 ... Chain dog, 10 ... Carrier dog, 20
...... Carrier self-weight drop prevention and halfway stop mechanism, 21 ……
Carrier recurrence mechanism.

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 chain dog that holds the standing state on the power rail by its own weight and engages with a carrier dog provided on the carrier to move the carrier, and a chain dog that is erected so as to face the chain dog and can be erected. In a free and power conveyor in which a power chain having a claw dog that further restricts rotation in a direction for releasing and releasing engagement and is pushed in a direction for releasing and releasing engagement is movably guided, the power rail In addition, a recess is formed in a part of the power rail in the middle of the descending slope of the free rail, which is spaced apart from the free rail. The carrier dog drop prevention plate for preventing the carrier dog from dropping due to its own weight by allowing the claw dog traveling down the downhill to pass through the recess in an upright state and engaging the carrier dog with the claw dog to prevent the carrier dog from falling. Tilt down in the recess to release the engagement with the carrier dog,
And a stopper member that abuts on the carrier dog to stop the downward movement of the carrier, and the dead weight fall prevention plate and the stopper member are alternately provided on the actuator in the recessed portion in a direction orthogonal to the extending direction of the power rail. The carrier's own weight drop prevention and intermediate stop mechanism at the forward / backward switching position and the carrier dog's carrier dog that is stopped halfway by the carrier's own weight fall prevention and intermediate stop mechanism, and the contact with the carrier dog is released by retreating the stove part. And a carrier recurrence mechanism that restrains the downward movement of the carrier until the chain dog engages with the carrier dog by the advance of the self-weight fall prevention plate and starts the carrier again. Gradient waiting device.