JPH037569B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a conveyance device equipped with a conveyance platform for conveying objects from a lower load receiving position to an upper unloading position on a vertically ascending conveyance path.

(Prior art and its problems) As described above, in the conventional conveying device equipped with the vertically ascending conveying path, the conveying platform is directly connected to the drive chain, and the tact operation of the drive chain moves the load from the lower receiving position to the upper unloading position. There is a type that is directly connected to a drive chain that automatically stops the conveyance table in sequence depending on the position, and a type that is configured so that the conveyance table can be moved relative to the drive chain only within a certain distance range. There is a known method in which the conveyor platform is moved up and down while locked to a drive chain at one end, and the lock is released at a stopping point in the vertically ascending conveyance path, stopping the conveyance platform only while the drive chain has moved a certain distance. There is.

The former method not only required tact operation of the drive chain, but also had the inconvenience of having to perform cargo receiving and unloading at the same time and within the same time period. Also, in the latter method,
Although it is possible to operate the drive chain continuously, there is an inconvenience that the time for receiving and unloading cargo is restricted due to the fixed time period during which the conveyance table can be stopped, and the time required for receiving and unloading the cargo is also limited. Since the conveyance table must later be moved to the lock position at a higher speed than the drive chain and locked, the mechanism is complicated and expensive.

In addition, in any of these systems, it is not possible to automatically store the conveyance table backward from the stop position, so in this respect as well, it is not possible to freely carry out the work of receiving and unloading goods.

(Means for Solving the Problems) The present invention proposes an elevating conveyance device capable of solving the conventional problems as described above. A chain is stretched over the drive chain, and a pair of upper and lower dogs are provided on the conveyance table that sandwich the pusher projecting from the drive chain from above and below, and the auxiliary dog that is on the lower side in the upward path moves the pusher towards the upper dog side. The main dog on the upper side is configured to be able to engage and disengage from the pusher, and is also equipped with a spring that biases it to the engaged position and a cam follower for engaging and disengaging the pusher. A movable cam for stopping the conveyance table which can be freely extended and retracted to act on a cam follower for engagement/disengagement operation to detach the main dog from the pusher is provided at a lower receiving position and an upper unloading position of the conveyor table ascending path,
Furthermore, each conveyance table includes a subsequent conveyance table stopping cam that acts on the engaging/disengaging operation cam follower of the subsequent conveyance table to detach the main dog from the pusher, and a fixing device disposed along the conveyance table ascending path. The present invention includes a fall prevention device that engages with the locked device to prevent the conveyance table from descending.

(Function) In the above-mentioned apparatus of the present invention, the pusher on the drive chain side is fitted between the upper and lower dogs of the conveyance table in the conveyance table raising path, and the conveyance table is pushed up and moved via the main dog. When the conveyance platform is to be stopped at the lower load receiving position and the upper load unloading position, the movable cam for stopping the conveyance platform is projected, and the cam acts on the engaging/disengaging operation cam follower to stop the main dog. Since it is removed from the pusher, the carrier is separated from the drive chain. At this time, the conveyance table tries to fall due to gravity, but since the fall prevention device on the conveyance side is engaged with the fixed and locked tool on the path side, the conveyance table stops at a predetermined position.

As described above, when a subsequent conveyance table approaches a stopped conveyance table by a certain distance or more, the cam for stopping the subsequent conveyance table of the stopped conveyance table acts on the cam follower for engagement/disengagement operation of the subsequent conveyance table. Since the main dog is removed from the pusher, the subsequent conveyance platform is also separated from the drive chain, and is stopped on the spot by the engagement of the fall prevention device with the fixed and locked device on the path side. In this way, the conveyance tables are sequentially stopped and stored as long as the preceding conveyance table is stopped.

In this way, for a conveyance platform that is stopped on the conveyance platform ascending path, the pusher on the drive chain side lowers the retractable auxiliary dog and moves upward passing the main dog in the release position. I can do it.

When starting the conveyance platform that is stopped at the stop position, the movable cam for stopping the conveyance platform is retracted and the main dog of the conveyance platform is returned to the engaged position, and the retractable auxiliary dog is brought down and raised. The pusher of the incoming drive chain engages the main dog and pushes the carriage up. When this conveyance table starts, the subsequent conveyance table stopping cam disengages from the following conveyance table's engaging/disengaging cam driven part, and the main dog of the subsequent conveyance table also returns to the engagement position with respect to the pusher, so that the subsequent pusher automatically Being pushed up.

(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 transport platform, which is provided with load receiving surfaces 2a and 2b on both the upper and lower sides, and is movable by a pair of left and right endless guide rails 3 that form an ascending and descending circulation path. is supported by Reference numeral 4 denotes a drive chain that rotates along the ascending and descending circulation path of the conveyance table 1, and includes an upper drive gear 6 and a lower take-up idle gear 7 that are interlocked and connected to a motor 5.
It is hung between. 8 is the transport platform ascending path 9
, 10 is an unloading position set near the upper end of the transport platform ascending path 9, 11 is a cargo receiving position set near the upper end of the transport platform descending path 12, and 13 is a cargo receiving position set near the lower end of . This is an unloading position set near the lower end of the conveyance platform lowering path 12.

As shown in FIGS. 3 to 5, the drive chain 4 is provided with flanged rollers 15 that fit into a pair of left and right endless guide rails 14, and rollers 15 with flanges are provided at regular intervals on the vertical circulation path side of the conveyor platform 1. A pusher 16 is provided in a protruding manner. In addition, in the transport platform ascending path 9 shown in FIG. 1, the steps shown in FIGS.
As shown in FIG. 6, a fixed locking device 18 using a chain is installed beside the movement path of the drive chain 4 via a support frame 17. The transport platform 1 includes a pair of upper and lower main wheels 19 that fit into the left and right pair of endless guide rails 3, a steady rest auxiliary roller 20 that comes into contact with the left and right pair of endless guide rails 3, and the pusher 16. A pair of upper and lower dogs 21 and 22 sandwiching the transport platform 1 from above and below engage with the fixed locking device 18 using the chain.
A fall prevention device 23 for preventing the lowering of the transport table and a cam 24 for stopping the subsequent conveyance table are provided.

Among the pair of upper and lower dogs 21 and 22, the auxiliary dog 22 is located on the lower side in the conveyance platform ascending path 9.
is rotatably pivoted between a pair of left and right support plates 26 by a support shaft 25, and is biased by a spring 27 interposed between the support plates 26.
A stopper 28 attached to the support plate 26
is held in an engaged position in contact with the The upper main dog 21 is pivoted between the support plates 26 by a support shaft 29 at bifurcated base portions 21a that sandwich the moving path of the pusher 16, and has a front surface 16a facing the moving direction of the pusher 16 in the middle portion. A cam follower (roller) 3 for engaging/disengaging operation is provided at the free end in a state of protruding to one side.
1 is provided. A stopper 33 is attached to the support plate 26 by being biased by a spring 32 interposed between the support plate 26 and the support plate 26.
is held in an engaged position in contact with the

The pivot shaft 29 of the main dog 21 is located directly below the roller 30 in the engaged position, and when the pusher 16 pushes up the main dog 21 via the roller 30, the main dog 21 Dotsugu 2
1 is configured so that it does not rotate around the support shaft 29 in the detachment direction.

As shown in FIGS. 3 and 6, the fall prevention device 23 has teeth that are pivotally connected via a one-way rotating clutch 36 to a fixed support shaft 35 that is fixed to a bearing plate 34 that is connected to the carrier 1. It is composed of a ring 37. The one-way rotation clutch 36 rotates in the direction of the arrow in FIG. 6 when the gear wheel 37 engages with the fixed locking device 18 using a chain when the carrier 1 moves up the carrier ascending path 9. However, it prevents rotation in the opposite direction.

When the following conveyance table 1 approaches within a certain distance as shown by the imaginary line in FIG. This actuates to swing the main dog 21 around the support shaft 29 against the spring 32 in the direction in which the roller 30 separates from the pusher 16. When the subsequent conveyance table 1 is stopped by the subsequent conveyance table stop cam 24 in this manner, the pair of left and right cushion rubbers 39 that are close to the left and right rear end portions 38 of the preceding conveyance table 1 are moved to the left and right sides of each conveyance table 1. Attached to the front end of both sides.
40 is a cam driven part (roller) 31 for engagement/disengagement operation
This is a member to be received when descending that protrudes from the conveyor table 1 in the direction of movement so as to be located outside of the conveyor table 1.

The loading position 8 and unloading position 10 of the conveying table ascending path 9 shown in FIG. A movable cam 41 is also provided.
This movable cam 41 is, for example, a cylinder unit 4.
2, the main dog 21 can be moved between the illustrated operating position and a retracted position in which the main dog 21 is returned.
Further, at the cargo receiving position 11 and the cargo unloading position 13 of the transport platform descending path 12 shown in FIG. A movable cam 43 for stopping the conveyance table which performs the same function as the cam 24 for stopping the conveyance table is also provided. As shown in the figure, this movable cam 43 can be moved by, for example, a cylinder unit 44 between the illustrated operating position and a retreat position where the main dog 21 is returned to its original position, and is stopped when in the operating position. A conveyance table receiving part 45 is provided to receive the conveyance table 1 via a stopper member 40 when the conveyance table 1 is lowered.

Next, the method of use and operation will be explained. When the drive chain 4 is rotated in a predetermined direction, the pusher 16 moves the auxiliary dog 22 between the main dog 21 and the auxiliary dog 22 of each conveyor table 1 with a spring. The pushers 16 are fitted while being rotated against the biasing force of the main dog 27, and as shown in FIGS.
The conveyance platform 1 is raised while pushing up the rollers 30. Furthermore, as shown in FIG. 7, in the conveyor table descending path 12, the conveyor table 1 is about to fall due to gravity.
Since the pusher 16 (roller 30) receives this via the auxiliary dog 22, the conveyance platform 1 descends at the same speed as the pusher 16.

When the movable cam 41 attached to the cargo receiving position 8 of the conveyance platform ascending path 9 is projected to the operating position as shown by the imaginary line in FIG. The movable cam 41 acts on the (roller 31) to swing the main dog 21 around the support shaft 29 against the biasing force of the spring 32, and the roller 31 is moved against the pusher 16.
is disengaged, so that the conveyance table 1 is released from driving at the receiving position 8. As a result, the carrier 1 tries to fall due to gravity, but since the gear 37 of the fall prevention device 23 is rotatable only in one direction that allows the carrier 1 to move upward, the gear 37 is fixed It engages with the locking device (chain) 18 to prevent the transport platform 1 from falling. That is, the conveyance platform 1 automatically stops at the cargo receiving position 8.

After the object to be transported is thus mounted on the upper cargo receiving surface 2a of the conveyance table 1 which stops at the cargo receiving position 8, the movable cam 41 is moved backward to the retreat position. As a result, the main dog 21 returns to the engagement position in which it comes into contact with the stopper 33 due to the biasing force of the spring 32, so that the pusher 16 approaching the carrier 1
is fitted between the main dog 21 and the auxiliary dog 22 as described above, and the carrier 1 is again driven upward.

Before the conveyance table 1 carrying the object to be conveyed reaches the unloading position 10 on the conveyance table ascending path 9, the movable cam 41 attached to the unloading position 10 is moved as shown by the imaginary line in FIG. When projected to the working position, the carrier 1 moves to the unloading position 10 as described above.
It will stop automatically. In this way, the conveyed object is carried out from the conveyance table 1 that has stopped at the unloading position 10, but while the conveyance table 1 is stopped at this unloading position 10, the following conveyance table 1 moves to the preceding stopped conveyance table 1. When approaching, the preceding stop conveyance platform 1 appears as shown by the imaginary line in Fig. 4.
Since the trailing conveyance platform stopping cam 24 switches the main dog 21 of the trailing conveyance platform 1 from the engaged position to the detached posture, the roller 30 comes off from the pusher 16 and the trailing conveyance platform 1 immediately collides with the preceding stopping conveyance platform 1. It will stop automatically. Similarly, the subsequent conveyance tables 1 are automatically stopped in sequence and stored.

When starting the conveyance platform 1 that is stopped at the unloading position 10, the movable cam 41 may be retreated to the retracted position as described above, and the main dog 21 of the conveyance platform 1 may be returned to the engaged position. . The conveyance table 1 with the main dog 21 returned to the engaged position in this way is propelled again as described above by the approaching pusher 16. The conveyance table stopping cam 24 is disengaged from the main dog 21 of the stop conveyance table 1 located immediately after, and the main dog 21 returns to the engaged position, so that the stop conveyance table 1 located immediately after is also stopped by the subsequent pusher 16. It was then promoted again. Each conveyance platform 1 stored in this way starts sequentially starting from the first one.
If the movable cam 41 is to be stopped at 0, the movable cam 41 may be projected to the operating position again after the first conveyance table 1 has started from the unloading position 10.

The transport platform 1, which is raised from the unloading position 10 by the pusher 16, is located at the upper end U of the ascending and descending circulation path.
It is turned upside down via the turn section, and then descends on the conveyance table lowering path 12 in the manner described above.
When the conveyance table 1 descending on the conveyance table lowering path 12 is stopped at the load receiving position 11 or the load unloading position 13, the movable cams 43 attached to these positions are projected to the operating position as shown by the imaginary lines in FIG. let As a result, the conveyance platform 1 that descends with the auxiliary dog 22 on the pusher 16 is moved by the movable cam 43.
With this, the main dog 21 is switched to the detached position from the pusher 16 and the roller 30 is removed from the moving path of the pusher 16, and when descending, the main dog 21 is moved by the conveyance platform receiving portion 45 of the movable cam 43 via the received member 40. I can accept it. Therefore, only the pusher 16 moves downwardly relative to the carrier 1. In this conveyance table lowering path 12, the lower load receiving surface 2b of the conveyor table 1 is on the upper side, and the object to be conveyed is mounted on this lower load receiving surface 2b.

As mentioned above, the receiving position 11 or the unloading position 13
When starting the conveyance platform 1 that has stopped at
Retract to the retreat position. As a result, the conveyance platform 1, which had been stopped, is lowered by gravity, and the auxiliary dog 22, which has returned to the engaged position by the spring 27, rides on the pusher 16, and the conveyance platform 1 is moved down by the pusher 16.
It descends again while being caught by 6.

Even when the following conveyance table 1 approaches the conveyance table 1 that has been stopped as described above on the conveyance table lowering path 12, the subsequent conveyance table of the stopped conveyance table 1 is moved as shown by the imaginary line in FIG. Immediately after the stopping cam 24 switches the main dog 21 of the trailing conveyance platform 1 to the detached position with respect to the pusher 16, the trailing conveyance platform 1 is received by the left and right rear end portions 38 of the preceding stopping conveyance platform 1 via cushion rubber 39. It will be done. In this way, the conveyance table 1 can be stored even on the conveyance table lowering path 12. When the conveyance tables 1 are stored on the conveyance table lowering route 12 in this way, all the following conveyance tables 1 descend simultaneously as the first (lower end) conveyance table 1 starts. Therefore, the next transport platform 1 is moved to the stop position (load receiving position 11) again.
Or, when stopping at the unloading position 13), the movable cam 43 is stopped before the conveyance platform 1 reaches the stop position.
All you have to do is make it protrude to the working position again.

In the above embodiment, the conveyance table lowering path 12 is also used as a conveyance path, but only the conveyance table ascending path 9 may be used as a conveyance path according to the present invention. In addition, a fixed chain is used as the fixed locked tool 18, and a gear ring 37 is used as the fall prevention tool 23.
Although a one-way rotary clutch 36 is used, a rack gear may be used instead of the fixed chain, and a spur gear may be used instead of the gear ring 37. Further, an anti-back pawl (ratchet pawl) that engages with a rack gear or chain as a fixed and locked device can also be used as a fall prevention device.

(Effects of the Invention) As described above, according to the elevating conveyance device of the present invention,
This can be done by stopping the conveyance platform at the receiving and unloading positions on the ascending route, and furthermore, it is possible to sequentially stop and store subsequent conveyance tables on the conveyor platform that stops at this stopping position, thereby reducing the time required for receiving and receiving cargo. This can be done easily and without physical constraints. Moreover, the drive chain only needs to be driven continuously, and there is no need for tact operation, so control can be easily performed. Furthermore, the structure is extremely simple and can be implemented at low cost compared to a conventional lifting and lowering conveyance device in which the conveyance table is moved by a feeder at a higher speed than the speed of the drive chain and is connected to a predetermined position of the drive chain.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway side view, Fig. 2 is a partially cutaway front view with the transport platform omitted, Fig. 3 is a cross-sectional plan view of the main part, and Figs. 4 and 5 are transport Fig. 6 is a side view of the main part showing the relationship between the transfer platform and the pusher on the drive chain side in the platform ascending path, and Fig. 7 shows the relationship between the transfer platform and the drive chain side in the platform descending path. FIG. 3 is a longitudinal cross-sectional side view of the main part showing the relationship with the pusher. 1... Conveyance platform, 2a, 2b... Load receiving surface, 3, 14...
Guide rail, 4... Drive chain, 8, 11... Load receiving position, 9... Transport platform ascending path, 10, 13... Loading position, 12... Transport platform descending path, 16... Pusher, 18... Fixed locked tool (chain ) 21... Main dog, 22... Retractable auxiliary dog, 23... Fall prevention device, 24... Cam for stopping the following conveyance platform, 27, 32...
Spring 28, 33...Stopper, 30, 31
...Roller, 36...One-way rotating clutch, 37...
Gear ring, 39... Cushion rubber, 40... Member to be received during descent, 41, 43... Movable cam for stopping the conveyance table, 45... Conveyance table receiving part.

Claims (1)

[Claims] 1. A drive chain is installed along the ascending and descending circulation path of the conveyance platform, and a pair of upper and lower dogs are provided on the conveyance platform that sandwich the pushers protruding from the drive chain from above and below, and a pair of upper and lower dogs are installed on the conveyance platform, and The auxiliary dog has a retractable shape that allows the pusher to pass only to the upper dog side, and the main dog on the upper side is configured to be able to engage and detach from the pusher, and also to engage and disengage with the spring that urges it to the engaged position. A movable cam for stopping the conveyance table that can move in and out to detach the main dog from the pusher by acting on the cam follower for engaging/disengaging operation is attached to the lower cargo receiving position and the upper position of the conveyor platform ascending path. Provided at the unloading position,
Furthermore, each conveyance table includes a subsequent conveyance table stopping cam that acts on the engaging/disengaging operation cam follower of the subsequent conveyance table to detach the main dog from the pusher, and a fixing device disposed along the conveyance table ascending path. An elevating and lowering conveyance device comprising a fall prevention device that engages with a locked tool to prevent the conveyance platform from descending.