JP5592666B2 - Load drop prevention device for stacker crane - Google Patents

Description

  The present invention includes a pair of front and rear masts erected from a floor surface, and a loading platform on which a load can be placed is suspended by a wire rope, and the loading platform is lifted and lowered by the wire rope between the two masts. The present invention relates to a device for preventing a load carrier from falling in a stacker crane.

  2. Description of the Related Art Conventionally, a device for preventing a lifting body (loading platform) from falling on a lifting equipment (stacker crane) has cam bodies (clamping members) on a pair of movable plates arranged on the left and right of a guide member (mast). When the wire rope is cut, the movable plate is raised by the urging means, and the cam body is sandwiched between the guide member and the cam member (loading member). During this operation, the pair of left and right cam bodies are the guide members. Is prevented from falling from the left and right sides (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 51-16548 (page 2, FIG. 3)

  However, in the fall prevention device described in Patent Document 1, when the fall prevention device is operated, the load of the lifting body (loading platform) continues to be applied to the cam body (clamping member) via the cam member (loading member). Thus, there is a problem that the load applies a force in the direction of rotating the cam body, and the cam body is rotated and the lifting body cannot be stopped at a predetermined position.

  The present invention has been made paying attention to such a problem, and when the holding member in the fall prevention device pinches the mast and stops the falling of the loading platform, the loading platform in the stacker crane that reliably stops the loading platform is dropped. An object is to provide a prevention device.

In order to solve the above-mentioned problem, a load carrier fall prevention device in a stacker crane of the present invention is
In a stacker crane having a pair of front and rear masts erected from a floor surface, a loading platform on which a load can be placed is suspended by a wire rope, and the loading platform is lifted and lowered by the wire rope between the two masts A cargo bed fall prevention device,
The fall prevention device has a pair of clamping members for clamping the mast from the left and right side surfaces together with the wire rope breakage, and load members to which the load of the cargo bed is applied are provided on the left and right sides of the both clamping members. The clamping member has a shape that applies the load of the loading platform applied via the weighting member toward the side surface of the mast, and the loading platform has an upper position suspended by the wire rope, and an attached position. It has a pulley moved between the lower position lowered by the biasing means, and the fall prevention device is operated when the pulley is in the lower position .
According to this feature, when the wire rope is broken and the fall prevention device is activated, both the holding members hold the mast and stop the falling of the loading platform, and the load on the loading platform is further clamped via the weighting member. The more it is added to the member, the more the clamping member presses the mast, the frictional resistance between the clamping member and the mast can be increased, and the cargo bed can be reliably stopped. Further, when the wire rope is cut, the pulley is immediately lowered to the lower position by the urging force of the urging means, and the operation timing of the fall prevention device can be synchronized with the cutting of the wire rope by using the movement of the pulley. .

The loading prevention device for the loading platform in the stacker crane of the present invention,
The clamping member has a substantially wedge shape disposed between a side surface of the mast and the weight member.
According to this feature, as the load on the loading platform is applied, the sandwiching member enters between the weight member and the side surface of the mast, and the force with which both sandwiching members sandwich the mast can be further increased.

The loading prevention device for the loading platform in the stacker crane of the present invention,
The fall prevention device is detachable from the loading platform, and the loading platform has an operating member that operates when the wire rope is disconnected, and the fall prevention device operates when the mounting to the loading platform is performed. It has an engaging member that engages with the member, and the clamping member is operated in conjunction with the engaging member.
According to this feature, the loading platform and the fall prevention device can be manufactured separately, and the engagement member that operates when the wire rope is disconnected and the clamping member can be operated simply by engaging the engagement member with the operation member. The members can be easily connected to each other, the fall preventing device can be easily attached to the loading platform, and the falling preventing device can be easily detached from the loading platform.

It is a side view which shows the stacker crane in an Example. It is a side view which shows a loading platform and a fall prevention apparatus. It is a front view which shows a loading platform and a fall prevention apparatus. It is an AA vertical front view in FIG. It is a BB vertical side view in FIG. It is a vertical side view which shows the state after the action | operation of the fall prevention apparatus in FIG. It is CC longitudinal cross-section rear view in FIG. FIG. 7 is a C′-C ′ longitudinal rear view in FIG. 6.

  EMBODIMENT OF THE INVENTION The form for implementing the fall prevention apparatus of the loading platform in the stacker crane which concerns on this invention is demonstrated below based on an Example.

  With reference to FIG. 1 to FIG. 8, a description will be given of a load carrier fall prevention device in a stacker crane according to a first embodiment. Hereinafter, the left side of FIG. 1, FIG. 2, FIG. 5 and FIG. 6 will be described as the front side (front side) of the stacker crane.

  Reference numeral 1 in FIG. 1 is a stacker crane including a fall prevention device to which the present invention is applied. The stacker crane 1 travels in the front-rear direction in the vicinity of a cargo rack (not shown), and can load and unload cargo with the cargo rack.

  As shown in FIG. 1, a floor rail 2 for running a stacker crane 1 is laid on the floor, and a ceiling rail 3 facing the same direction as the floor rail 2 is provided above the stacker crane 1. It has been.

  The stacker crane 1 is provided with a pair of front and rear masts 4, 4 extending in the vertical direction between the ceiling rail 3 and the floor rail 2, and the mast 4 is guided by the ceiling rail 3 above the mast 4. A support member 5 that supports the stacker crane 1 is provided, and a dolly 6 that can travel on the floor rail 2 is provided below the mast 4.

  By driving a traveling motor 7 provided on the rear side of the stacker crane 1, the stacker crane 1 can travel in the front-rear direction while being guided by the ceiling rail 3 and the floor rail 2.

  As shown in FIG. 2, on the masts 4 and 4 before and after the stacker crane 1, a loading platform 8 that can be moved up and down is arranged, and this loading platform 8 can place a container 9 as a load in the present invention. It is comprised by the mounting part 8a and a pair of raising / lowering part 8b standingly arranged before and behind the mounting part 8a.

  A drive unit 10 for loading and unloading the container 9 is provided on the lower surface side of the mounting portion 8a. By driving the driving unit 10, two claw portions 11 provided on the upper portion of the mounting portion 8a. Is movable in the left-right direction. The container 9 is placed on the upper surface of the pallet 12, and the two claw portions 11 can be inserted into and removed from the lower part of the pallet 12 to be loaded and unloaded.

  As shown in FIG. 1, three pulleys 13 are provided at the upper end portion of the mast 4. A pulley 14 described later is provided in each of the front and rear elevating parts 8b. A driving drum body 15 and a lifting motor 16 are provided at the lower part of the front mast 4, and a wire rope 17 is bridged between the pulleys 14 and 14 and the driving drum body 15.

  The driving drum body 15 is connected to the lifting motor 16 via a chain (not shown). When the lifting motor 16 is driven, the driving drum body 15 is driven to rotate, and the wire rope 17 slides on the pulleys 14 and 14. The loading platform 8 is pulled by the wire rope 17 and can be moved up and down.

  As shown in FIGS. 2 and 3, a pair of left and right guide rollers 18a that slide in contact with the left and right side surfaces of the mast 4 with the central axis of rotation facing the front and rear direction are vertically attached to the front and rear elevating parts 8b. A guide roller 18b that is in contact with the inner surface of the mast 4 with the central axis of rotation facing in the left-right direction is attached, and the loading platform 8 is guided in the vertical direction along the mast 4 by the guide rollers 18a and 18b. ing.

  As shown in FIGS. 3 to 5, a rectangular upper bracket 19 is attached to the upper part of the elevating part 8 b when viewed from the front, and a pulley 14 is disposed inside the upper bracket 19. Long holes 19a, 19a that are long in the vertical direction are formed on the front and rear surfaces of the upper bracket 19 (see FIG. 3), and the pulley shaft 14a of the pulley 14 is passed through the long holes 19a, 19a. The lower bracket 20 and the pulley shaft 14a are connected by front and rear connecting bolts 21 and 21 (see FIG. 5).

  Further, as described above, the wire rope 17 is bridged over the pulley 14, and the derailment of the wire rope 17 is prevented by the L-shaped wire guard 22 attached to the lower bracket 20 (FIG. 4). reference).

  As shown in FIG. 5, a support bolt 23 is inserted from the lower surface side of the lower bracket 20 to the lower portion of the upper bracket 19, and a spring member 24 (coil spring) as an urging means in the present invention is provided on the shaft of the support bolt 23. The lower bracket 20 is urged by the spring member 24 in the direction in which the pulley 14 is lowered. Moreover, the left and right two pins 25, 25 projecting outward are attached to the lower end of the lower bracket 20 (see FIG. 4).

  Since the pulley 14 and the lower bracket 20 are connected by the connecting bolt 21 through the pulley shaft 14a inserted through the long hole 19a, the pulley 14 and the lower bracket 20 can be moved up and down integrally. Here, the position of the pulley 14 where the pulley shaft 14a is located above the long hole 19a is defined as an upper position (see FIG. 5), and the position of the pulley 14 where the pulley shaft 14a is located below the long hole 19a is defined as a lower position. (See FIG. 6).

  As shown in FIG. 5, in the normal state where the loading platform 8 is raised and lowered in the stacker crane 1, the pulley 14 is suspended by the wire rope 17, and the pulley shaft 14 a is located above the elongated hole 19 a of the upper bracket 19. Placed in position. Similarly, since the lower bracket 20 connected to the pulley shaft 14a is also lifted upward with respect to the upper bracket 19, the spring member 24 is compressed between the lower surface of the upper bracket 19 and the lower surface of the lower bracket 20. Yes.

  Next, the fall prevention device 26 provided before and after the loading platform 8 will be described. As shown in FIG. 2, the fall prevention device 26 is attached to the mast 4 side of the elevating part 8b. Since the configuration of the front and rear fall prevention devices 26 is the same, the rear side fall prevention device 26 will be described with reference to FIGS. 5 and 7, and description of the front side fall prevention device 26 will be omitted.

  As shown in FIGS. 5 and 7, a pair of left and right device main bodies 27, 27 constituting the fall prevention device 26 are disposed between the upper and lower guide rollers 18 a, 18 a in the elevating unit 8 b. The apparatus main body 27 has a substantially rectangular shape in a front view and a substantially U shape in a side view, and upper and lower end portions are screwed to a rear surface (or front surface) of the elevating / lowering portion 8b. Further, the central portion of the apparatus main body 27 protrudes from the elevating part 8b to the left and right side surfaces of the mast 4. Note that the left and right apparatus main bodies 27 and 27 have a bilaterally symmetrical configuration, and the mast 4 side of the apparatus main body 27 will be described as the inner side and the opposite side as the outer side.

  As shown in FIG. 5, the apparatus main body 27 has a substantially box shape with an inner side surface opened, and the upper plate 27c and the lower plate 27d are extended toward the elevating part 8b. Guide holes 27a and 27a for guiding a guide shaft 28, which will be described later, are formed on the front and rear side surfaces of the apparatus main body 27 so as to face each other. The guide holes 27a and 27a are directed downward and outward. Inclined (see FIG. 7), that is, the left and right guide holes 27a, 27a are arranged so as to form an approximately eight shape in the rear view (or front view).

  An engagement member 30 that engages with a swing member 29 as an operation member in the present invention is provided on the side surface of the apparatus body 27 on the side of the loading platform 8, and the distal end portion of the engagement member 30 has a protruding shape. The guide holes 27a, 27a and the two guide shafts 28, 28 that pass through the engaging member 30 are screwed together. Further, two rollers 31 as weighting members in the present invention coaxial with the guide shaft 28 are attached to the outside of the guide shaft 28 along the inclination of the guide hole 27a. 27 is inserted in the front-rear direction.

  A holding member 32 for holding both side surfaces of the mast 4 is housed inside the apparatus main body 27, and the guide shafts 28, 28 inserted through the front and rear guide holes 27 a, 27 a described above are attached to the holding member 32. The guide shaft 28 and the clamping member 32 are integrated.

  As shown in FIG. 7, the contact surfaces 32 a that contact the mast 4 in the left and right clamping members 32, 32 are rectangular in a side view and are formed substantially parallel to the side surfaces of the mast 4. When the side surface of the mast 4 is clamped, the contact surface 32a that contacts the side surface of the mast 4 is formed to have a large area.

  Further, an anti-slip rubber sheet 36 having the same size as that of the contact surface 32a is adhered to the entire surface of the contact surface 32a. The anti-slip rubber sheet 36 has a number of irregularities formed on the surface thereof. As will be described later, when the contact surface 32a comes into contact with the surface of the mast 4, it has a high frictional force.

  Furthermore, the upper part of the clamping member 32 is formed in a substantially wedge shape disposed between the side surface of the mast 4 and the roller 31, and the side surface on the roller 31 side in the upper part of the clamping member 32 is matched with the arrangement of the roller 31. The inclined surface 32b is inclined, and the upper surface thereof is a substantially horizontal horizontal surface 32c.

  In addition, a substantially horizontal horizontal surface 32 d located below the lower roller 31 is formed at the lower part of the clamping member 32. A recess 32e is formed on the lower surface of the holding member 32, and a part of a spring member 33 (coil spring) that is attached to the upper surface of the lower plate 27d of the apparatus main body 27 and faces in the up-down direction is disposed in the recess 32e.

  As shown in FIG. 5, a swinging member 29 that can swing up and down about an axis that faces in the left-right direction is attached to the elevating part 8 b. The front end side of the swing member 29 protrudes from the elevating part 8b to the mast 4 side, and is a front end engagement portion 29a that engages with the engagement member 30 of the apparatus main body 27. The base end side of the swing member 29 is It is the base end engaging part 29b arrange | positioned in the raising / lowering part 8b. A hole 29c is formed in the base end engaging portion 29b, and the pin 25 attached to the lower end portion of the lower bracket 20 is inserted through the hole 29c.

  Further, the tip engaging portion 29 a of the swinging member 29 abuts on and engages with the upper surface of the engaging member 30, and the clamping member 32 is pushed downward via the guide shaft 28. The attached spring member 33 is compressed by the clamping member 32.

  As shown in FIG. 7, a horizontal plate portion 27b is provided on the outer side surface of the apparatus main body 27, and a plate portion 34 that protrudes outward below the plate portion 27b is attached to the clamping member 32. It has been. A locking bolt 35 is provided on the plate portion 27b of the apparatus main body 27. By lowering the locking bolt 35 to the plate portion 34 of the holding member 32, the clamping member 29 is pressed downward, and the spring member 33 is compressed. .

  The apparatus main body 27 can be installed or replaced while the spring member 33 is compressed by the locking bolt 35 and the plate portion 34. Further, when the apparatus main body 27 is installed and the swinging member 29 and the engaging member 30 are engaged, the spring member 33 is maintained in its compressed state, so that the locking bolt 35 is raised and separated from the plate portion 34. Thus, the fall prevention device 26 becomes operable. That is, the locking bolt 35 serves as an operation preventing means during maintenance for preventing the operation of the fall prevention device 26.

  Next, the operation of the fall prevention device 26 in an emergency when the wire rope 17 is disconnected will be described with reference to FIGS. As shown in FIG. 7, in a normal state where the fall prevention device 26 does not operate, there is a gap between the mast 4 and the clamping member 32, and the fall prevention device 26 does not hinder the lifting and lowering of the loading platform 8. Are arranged as follows.

  As shown in FIG. 6, when the wire rope 17 is disconnected, the wire rope 17 has no force to pull up the lower bracket 20 via the pulley shaft 14 a of the pulley 14, and the lower bracket 20 is moved to the upper bracket 19 by the biasing force of the spring member 24. Therefore, the pulley shaft 14a moves to the lower part of the long hole 19a, and the pulley 14 is lowered to a lower position.

  When the lower bracket 20 is lowered, the left and right pins 25 attached to the lower end of the lower bracket 20 are lowered, and the left and right swing members 29 through which the pins 25 are inserted swing. When the proximal end engaging portion 29b of the swinging member 29 is lowered and the distal end engaging portion 29a is lifted, the leading end engaging portion 29a of the swinging member 29 is detached from the upper surface of the engaging member 30 and falls left and right. The prevention device 26 is activated.

  As described above, the pulley 14, the lower bracket 20, the spring member 24, the pin 25, and the swing member 29 serve as a disconnection detection unit that detects a disconnection of the wire rope 17, and the fall prevention device 26 is configured by the disconnection detection unit. It comes to work.

  As shown in FIG. 8, when the engaging member 30 is disengaged from the distal end engaging portion 29 a, the holding member 32 is pushed upward in the apparatus main body 27 by the urging force of the spring member 33 in the apparatus main body 27, and the holding member 32. The guide shaft 28 inserted into the guide hole 27a moves, the clamping member 32 rises and is guided to the mast 4 side, and the anti-slip rubber sheet 36 adhered to the contact surface 32a of the clamping member 32 is attached to the mast 4. Abut. In this way, the left and right device main bodies 27, 27 are operated, the left and right side surfaces of the mast 4 are clamped by the left and right clamping members 32, 32, and the loading platform 8 stops falling.

  Further, as the clamping member 32 rises, the load on the loading platform 8 is applied to the inclined surface 32b of the clamping member 32 via the roller 31. The more the loading of the loading platform 8 is applied to the clamping member 32, the more the clamping member 32 is applied. However, the force which clamps the mast 4 becomes strong, the frictional resistance between the clamping member 32 and the mast 4 can be increased, and the loading platform 8 can be stopped reliably.

  The upper plate 27c of the apparatus main body 27 is above the horizontal surface 32c above the clamping member 32, and the lower roller 31 is above the horizontal surface 32d below the clamping member 32. The rising is restricted by the two horizontal surfaces 32c and 32d coming into contact with the lower surface 31 or the lower roller 31 of the upper plate 27c of the apparatus main body 27. Therefore, the clamping member 32 is not detached from the apparatus main body 27, and the load of the loading platform 8 applied from the upper and lower rollers 31, 31 is surely applied to the clamping member 32.

  As described above, the fall prevention device 26 is compactly formed by forming the device main body 27 in a box shape, and space saving is possible. In addition, since the device main body 27 is formed in a U-shape and is projected and attached to the left and right side surfaces of the mast 4, a space is created between the device main body 27 and the elevating unit 8b, and visibility is improved. Maintenance such as on-site construction, parts replacement and adjustment is easy.

  Further, the upper and lower end portions of the apparatus main body 27 are screwed to the elevating part 8b, and the engagement member 30 attached to the apparatus main body 27 and the swing member 29 attached to the elevating part 8b are engaged with each other. Therefore, the fall prevention device 26 is detachable and can be added as an option, so that the cost can be reduced.

  As described above, in the fall prevention device 26 for the loading platform 8 in the stacker crane 1 according to the present embodiment, the fall prevention device 26 has a pair of clamping members 32 that clamp the mast 4 from both the left and right sides together with the disconnection of the wire rope 17. Rollers 31 to which the load of the loading platform 8 is applied are provided on both the left and right sides of the both clamping members 32, and the clamping member 32 has a shape that applies the load of the loading platform 8 applied via the rollers 31 toward the side surface of the mast 4. Thus, when the wire rope 17 is disconnected and the fall prevention device 26 is operated, both the holding members 32 sandwich the mast 4 to stop the fall of the cargo bed 8, and further, the cargo bed 8 via the roller 31. The more the load is applied to the holding member 32, the more the holding member 32 presses the mast 4 and the frictional resistance between the holding member 32 and the mast 4 can be increased. It can be stopped.

  Further, the sandwiching member 32 has a substantially wedge shape disposed between the side surface of the mast 4 and the roller 31, so that the sandwiching member 32 is positioned between the roller 31 and the side surface of the mast 4 as the load of the loading platform 8 is applied. Thus, the force that the both clamping members 32 clamp the mast 4 can be further increased.

  The fall prevention device 26 is detachable from the loading platform 8, and the loading platform 8 has a swing member 29 that operates when the wire rope 17 is disconnected, and the fall prevention device 26 is attached to the loading platform 8. Since the engaging member 30 is engaged with the swinging member 29 at the time of attachment, and the clamping member 32 is operated in conjunction with the engaging member 30, the loading platform 8 and the fall prevention device 26 are separately provided. The engaging member 30 can be manufactured, and the engaging member 30 that operates when the wire rope 17 is disconnected can be easily connected to the engaging member 30 that is interlocked with the holding member 32 simply by engaging the engaging member 30 with the swinging member 29. Thus, the fall prevention device 26 can be easily attached to the loading platform 8 later, and the fall prevention device 26 can be easily detached from the loading platform 8.

  The loading platform 8 has a pulley 14 that is moved between an upper position suspended by the wire rope 17 and a lower position lowered by the spring member 24, and the pulley 14 is in the lower position. Since the fall prevention device 26 is activated, the pulley 14 is immediately lowered to the lower position by the urging force of the spring member 24 when the wire rope 17 is cut, and the pulley 14 is dropped using the movement of the pulley 14. The timing of the operation of the prevention device 26 can be synchronized with the cutting of the wire rope 17.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  For example, in the above-described embodiment, the anti-slip rubber sheet 36 is used for the contact surface 32a of the clamping member 32, but other synthetic resin materials such as urethane are used as long as they have a frictional force against the mast 4. May be.

DESCRIPTION OF SYMBOLS 1 Stacker crane 4 Mast 8 Loading platform 8b Lifting part 14 Pulley 17 Wire rope 19 Upper bracket 19a Long hole 20 Lower bracket 24 Spring member (biasing means)
25 pin 26 fall prevention device 27 device main body 27a guide hole 28 guide shaft 29 swing member (actuating member)
29a Tip engagement portion 29b Base end engagement portion 29c Hole 30 Engagement member 31 Roller (loading member)
32 clamping member 32a contact surface 32b inclined surface 32c, 32d horizontal surface 33 spring member 35 locking bolt 36 anti-slip rubber sheet

Claims (3)

In a stacker crane having a pair of front and rear masts erected from a floor surface, a loading platform on which a load can be placed is suspended by a wire rope, and the loading platform is lifted and lowered by the wire rope between the two masts A cargo bed fall prevention device,
The fall prevention device has a pair of clamping members for clamping the mast from the left and right side surfaces together with the wire rope breakage, and load members to which the load of the cargo bed is applied are provided on the left and right sides of the both clamping members. The clamping member has a shape that applies the load of the loading platform applied via the weighting member toward the side surface of the mast, and the loading platform has an upper position suspended by the wire rope, and an attached position. A stacker crane having a pulley moved between a lower position lowered by a biasing means, and wherein the fall prevention device is activated when the pulley is in the lower position. Load drop prevention device.   The apparatus for preventing fall of a loading platform in a stacker crane according to claim 1, wherein the clamping member has a substantially wedge shape disposed between a side surface of the mast and the weight member.   The fall prevention device is detachable from the loading platform, and the loading platform has an operating member that operates when the wire rope is disconnected, and the fall prevention device operates when the mounting to the loading platform is performed. The falling of the loading platform in the stacker crane according to claim 1, further comprising an engaging member that engages with the member, wherein the clamping member is operated in conjunction with the engaging member. Prevention device.

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