JP4585105B2 - Drum can clamping device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a clamping device, and more particularly to a drum can clamping device that is attached as an attachment when a cylindrical load such as a drum can is transported by a forklift or the like.
[0002]
[Prior art]
Conventionally, when clamping a drum can, both clamp arms are opened at a predetermined interval, moved straight toward the drum can and stopped at a position where the drum can be sandwiched, and both clamp arms are moved inward, that is, in a closing direction. The drum can be pressed against the peripheral wall.
[0003]
At this time, since the flat inner surface of the clamp arm and the peripheral wall of the circular drum can come into contact with each other, the contact area is extremely small, as if it is in a line contact state. Therefore, if both clamp arms are pressed against the peripheral wall to securely hold the drum can, the drum can be deformed into an elliptical shape. In particular, the deformation is significant in an open drum, that is, a drum can from which a canopy is removed in order to rotate and eject the drum.
Further, when the clamp arm is rotated while the drum can is sandwiched and the drum can is rotated 180 °, the drum can be slipped off due to deformation of the drum can.
[0004]
Therefore, in order to prevent the drum can from being deformed even if it is compressed by a force capable of gripping the drum, and not being dropped even if the drum is rotated, as shown in FIG. It is conceivable to provide a pair of left and right arc-shaped chucks c having the same curvature as the outer periphery so as to face each other.
[0005]
[Problems to be solved by the invention]
In the arc-shaped chuck c of the conventional example, as in the drum can d of FIG. 8, if the chuck c can be pressed against the peripheral wall in a state where the center O of the drum can substantially coincides with the rotation shaft b, that is, the core is aligned. Although it is good, when the chuck c is pressed in a state where they are not identical, that is, in a state of misalignment, like the drum can D indicated by a one-dot chain line, the following problem occurs. That is,
(1) The chuck c is damaged or deformed due to an eccentric load.
[0006]
(2) The peripheral wall of the drum can usually be formed to a thickness of 1.2 to 1.6 mm and is strong, but when subjected to the load of the chuck c, it may be partially deformed permanently.
(3) The drum can fall without being completely gripped. Even if it does not fall, the drum can slide down when the chuck rotates.
[0007]
Therefore, it is necessary to accurately align the drum can with the arc-shaped chuck, but this alignment is difficult even for an experienced operator, and the vehicle body is moved several times back and forth and left and right for alignment. is doing. For this reason, the forklift moves unnecessarily until the drum can is clamped, and takes a lot of time, so that the work efficiency such as conveyance is not good.
[0008]
In view of the above circumstances, an object of the present invention is to prevent deformation of a clamped can and the like and improve work efficiency such as conveyance. Another object is to avoid the use of a dedicated forklift by facilitating attachment to and removal from an ordinary forklift.
[0009]
[Means for Solving the Problems]
According to the present invention, a drum can clamping device includes a pair of left and right clamp arms that can be freely opened and closed; a pair of left and right circles that are in contact with a peripheral wall of a clamped can during clamping over a half circumference and whose base end is hinged A grip metal fitting made of an arc-shaped chuck; a pair of left and right rotating shafts that protrude from the inner end of the clamp arm and face each other; and an intermediate link that connects the rotating shaft and the free end side of the arc-shaped chuck. And an intermediate link connected to the rotary shaft via a support rod .
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The present inventor can automatically align the center of the gripping metal if the gripping metal can be brought into close contact with the peripheral wall of the drum can by moving the forklift straight ahead even if the center of the gripping metal is shifted from the center of the drum. I thought it was a thing and repeated research experiments.
[0012]
As a result, we have developed a gripping fixture that consists of a pair of left and right arc-shaped chucks that are in contact with each other over half a circumference of the peripheral wall of the clamped can during clamping and whose base end is hinged, and the free end of the chuck It has been found that a so-called W-shaped link may be configured by connecting the side and the tip of the clamp arm via an intermediate link.
[0013]
When a pair of left and right rotating shafts facing each other are projected from the inside of the clamp arm and the intermediate link is connected to the rotating shaft, the gripped drum can can be rotated.
Needless to say, the gripping metal can be gripped not only in a drum can but also in a cylindrical body. The present invention has been made based on the above findings.
[0014]
【Example】
An embodiment of the present invention will be described with reference to FIGS.
A mast device 2 is erected on the head of the body 1 of the forklift. The mast device 2 is provided with a finger bar 3, and two forks 3 a are attached to the finger bar 3, and move up and down along the mast device 2 by driving means (not shown).
[0015]
The fork 3 a is inserted into the fork sheath 45 of the clamp device 5 and is stopped so as not to slide forward with the chain 4.
The clamp device 5 includes a pair of left and right clamp arms 6, 6, a gripping metal 8 disposed between the both clamp arms 6, 6, and a pair of left and right rotating shafts 22 provided on the clamp arms 6, 6. 23, and intermediate links 12 and 12 for connecting the rotary shafts 22 and 23 and the gripping fitting 8 to each other.
[0016]
L-shaped connecting arms 15 and 15 are provided at rear end portions 6b and 6b of both clamp arms 6 and 6, and link arms 16 and 17 are provided on the left end side and the right end side of the connecting arms 15 and 15, respectively. One end is pivotally supported.
The link arms 16 and 17 are provided in parallel with each other, and the other ends are rotatably supported.
[0017]
The central portions of the link arms 17 and 17 are supported by the tuning gear 19, and the support portions are provided symmetrically with the machine axis C. A cylinder 20 with a motor is provided at the rear ends of the link arms 17 and 17, and both the link arms 17 and 17 are rotated by the operation of the cylinder 20 to move the connecting arms 15 and 15 into parallel moving links. .
[0018]
Rotating shafts 22 and 23 are provided on the inner sides of the tip ends 6a and 6a of the clamp arms 6 and 6, and support rods 25 are fixed to the rotating shafts 22 and 23, respectively. One end of the intermediate link 12 is pivotally supported at one end of the support rod 25, and the gripping fitting 8 is pivotally supported at the other end of the intermediate link 12.
[0019]
The rotation shaft 22 is a drive shaft and is rotated by a motor-equipped cylinder 27 provided in the clamp arms 6 and 6, and the rotation mechanism portion is covered by a rotation cover 28.
[0020]
The gripping bracket 8 includes a pair of left and right arc-shaped chucks 8A and 8A. Both chucks 8A and 8A are formed by forming a band-shaped metal plate into an arc shape as shown in FIG. The base end portions 8 a and 8 a are connected to the hinge 9.
[0021]
The lengths of the arcs of both chucks 8A and 8A are appropriately selected as necessary, but the total arc length of the gripping bracket 8, that is, the total length of the arcs of both chucks 8A and 8A is added. Cannot be gripped unless the outer diameter W × π of the outer periphery of the clamped can 30 is equal to or larger than ½, the arc length of each chuck 8A, 8A is equal to or larger than ¼ of the outer circumferential length Wπ. Necessary.
[0022]
Since the arc length Wπ / 4 corresponds to a central angle of 90 degrees, it is necessary that both chucks 8A and 8A have arcs having a central angle of 90 degrees or more.
[0023]
In this embodiment, the central angle of the arc of each chuck 8A, 8A is set to 126 degrees, and the length of the arc of the gripping fixture 8 is set to 0.7 Wπ, that is, 70% of the outer peripheral length Wπ. .6 Wπ to 0.8 Wπ, that is, 60% to 80%.
[0024]
An elastic material 32 such as rubber is stretched as a protective member on the inner surfaces of the chucks 8A and 8A. Spring stoppers 33 and 33 are erected on the base end portions 8a and 8a of the chucks 8A and 8A, respectively, and a tension is applied between the spring stoppers 33 and 33 to urge the chucks 8A and 8A in the opening direction. A spring 35 is stretched.
[0025]
The intermediate link 12 is axially attached to the link receivers 37, 37 of the free ends 8b, 8b of the chucks 8A, 8A. Both link receivers 37, 37 are arranged symmetrically with the machine axis C. In the figure, 40 is a remote control transmitter, 41 is a pendant switch used when the remote control transmitter 40 breaks down, 42 is a remote control receiver, 43 is a controller, 44 is a battery, and 45 is also used as a base frame. Each fork sheath is shown.
[0026]
Next, the operation of the present embodiment will be described. The clamp device 5 is controlled by the operator operating the remote control transmitter 40 or the pendant switch 41 at the driver's seat.
[0027]
When the motor-equipped cylinder 20 is driven and the piston P is slid in a predetermined direction, the link arms 17 and 17 rotate, and the connecting arms 15 and 15 move outward while being restricted by the link arms 16 and 16. Therefore, both the clamp arms 6 and 6 gradually move outward and pull the intermediate link 12, so that both chucks 8 </ b> A and 8 </ b> A biased in the opening direction by the tension spring 35 gradually start to open.
[0028]
When the movement of the clamp arms 6 and 6 stops at a predetermined position, the chucks 8A and 8A are opened to the maximum as shown in FIG. At this time, the gripping metal fitting 8 is opened sufficiently larger than the clamped can, that is, the diameter W of the drum can 30, for example, W = 570 mm.
[0029]
When the forklift moves straight toward the drum can 30 in this state, as shown in FIG. 3, the vicinity of the hinge 9 of the gripping metal 8 hits the drum can 30. At this time, the machine shaft C does not coincide with the center O of the drum can 30, and the drum can 30 is biased toward the arcuate chuck 8 </ b> A side of the rotating shaft 22.
[0030]
Further, when the forklift is moved straight, as shown in FIG. 4, the intermediate links 12, 12 are folded inward at the fulcrums 12 a, 12 a around the hinge 9 of the gripping metal 8, and both chucks 8 A, 8 A are peripheral walls of the drum can 30. Adhere to CB. At this time, the gripping bracket 8 and the intermediate links 12 and 12 form a so-called W-type link mechanism.
[0031]
Next, in this state, when the piston P of the cylinder 20 with the motor is moved in the opposite direction, the clamp arms 6 and 6 are moved inward, that is, in the closing direction.
Then, both chucks 8A and 8A rotate while abutting against the peripheral wall CB of the drum can 30, and the drum can 30 slides on the floor surface and its center 0 approaches the axis C.
[0032]
When the outer surfaces of both chucks 8A and 8A come into contact with the rotary shafts 22 and 23, as shown in FIG. 5, the center 0 of the hinge 9 and the drum can 30 is located on the machine shaft C and is completely aligned. . The left and right clamp arms 6 and 6 are tuned by four gears so that the rotation shafts 22 and 23 are not rotated.
[0033]
In this state, the mast device 2 is driven to raise the clamp arms 6 and 6 to separate the drum 30 from the floor surface. At this time, since the drum can 30 is supported by the gripping fitting 8 over the circumferential wall CB over a half circumference, it is not deformed or dropped.
[0034]
The vehicle body 1 is moved to convey the drum 30 to a predetermined position.
When it is necessary to rotate the drum 30, when the motor-equipped cylinder 27 is driven to rotate the rotating shaft 22 by a predetermined angle, for example, 90 degrees, a half-rotation state is obtained as shown in FIG. 7.
[0035]
When the gripping metal piece 8 is separated from the drum can 30, the drum can 30 is placed on the floor, and then the piston P of the cylinder 20 with the motor is extended to move the clamp arms 6 and 6 outward. Then, the chucks 8A and 8A are separated from the rotary shafts 22 and 23, and are rotated around the hinge 9 to be in an open state, and the gripping metal piece 8 is separated from the drum can 30.
[0036]
【The invention's effect】
The present invention relates to a pair of left and right clamp arms in which a clamp device can be opened and closed; a pair of left and right arc-shaped chucks that are in contact with a peripheral wall of a clamped can during clamping for more than half a circumference and whose base end is hinged And a middle link that connects the free end side of the arc-shaped chuck and the tip of the clamp arm; therefore, the forklift is advanced by opening the gripping metal and the clamped can is sandwiched After that, it is automatically aligned by simply moving the clamp arm inward.
And a pair of left and right rotating shafts that protrude from the inside of the tip end portion of the clamp arm and oppose each other; and an intermediate link that connects the rotating shaft and the free end side of the arc-shaped chuck. After gripping the clamp can, the to-be-clamped can can be rotated at an arbitrary angle by rotating the rotating shaft in a predetermined direction.
Therefore, in the present invention, unlike the conventional example, deformation of the clamped can can be prevented and work efficiency such as conveyance can be improved.
[Brief description of the drawings]
FIG. 1 is a plan view showing a first embodiment of the present invention.
FIG. 2 is a side view showing a first embodiment of the present invention.
FIG. 3 is a plan view showing a state of a clamping start stage of the clamping device.
FIG. 4 is a plan view showing a state where an arc-shaped chuck is in contact with a peripheral wall of a clamped can.
FIG. 5 is a plan view showing a state where clamping is completed.
FIG. 6 is a view showing a part of an enlarged front view of a gripping metal fitting.
FIG. 7 is a plan view showing a half rotation state of the clamp device.
FIG. 8 is a plan view showing a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Car body 6 Clamp arm 8 Grip metal fitting 9 Hinge 12 Intermediate link 15 Connection arm 22 Rotating shaft 23 Rotating shaft 30 Clamped can

Claims (8)

A pair of left and right clamp arms that can be opened and closed;
A gripping fitting made up of a pair of left and right arc-shaped chucks which are in contact with the peripheral wall of the clamped can during clamping for more than half a circumference and whose base ends are hinged;
A pair of left and right rotating shafts protruding from the inside of the tip of the clamp arm and facing each other;
An intermediate link connecting the rotary shaft and the free end of the arcuate chuck, the intermediate link being connected to the rotary shaft via a support rod;
A drum can clamping device comprising: 2. The drum can clamping device according to claim 1, wherein a spring for urging the gripping member in the opening direction is stretched on the base end side of both arc-shaped chucks . 2. The drum can clamping device according to claim 1 , wherein an elastic member is stretched on the inner surface of the arc-shaped chuck . 2. The drum can clamping device according to claim 1 , wherein the gripping metal abuts over 60% to 80% of the outer periphery of the clamped can during clamping. Connection point between the arc-shaped chuck and the intermediate links, the clamping device of drum according to claim 1, wherein that you have provided at the distal end portion of the circular arc-shaped chuck. Rotating shaft, clamping device drum according to claim 1, wherein the pressure to Rukoto the outer surface of the arcuate chuck during clamping. Extension of the axis of the rotating shaft, the clamping device of drum according to claim 1, wherein the through Rukoto the center of the clamp cans during clamping. We are clamping device drum according to claim 1, wherein Rukoto detachably attached to a forklift.

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