JP4264202B2 - Centrifugal dehydration equipment such as pallets - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a centrifugal dehydration apparatus that removes a liquid such as a cleaning liquid attached to a rectangular work (hereinafter referred to as a pallet or the like) such as a pallet or a tray / container similar to the pallet, by a centrifugal force, and particularly the pallet or the like. About how to hold
[0002]
[Prior art]
Conventionally, when a pallet made of resin or the like is centrifugally dehydrated, it is common to perform centrifugal dehydration in a horizontal state while being conveyed on a conveyor. However, a pallet or the like is provided with a large number of ribs to increase the strength, and a large number of recesses are formed by these ribs, and the cleaning liquid accumulated in the recesses cannot be easily removed even by centrifugal dehydration. Was real. Then, what is rotated about the centrifugal dehydration of a pallet in the state which stood the pallet up is disclosed (Japanese Utility Model Laid-Open No. 6-52973). In this case, the cleaning liquid remaining in the recess can be efficiently removed. However, in the case of this prior art, there is a technical problem that the center tends to shift when the pallet is held, and if the pallet is rotated as it is, it becomes unstable due to unbalance and there is a great risk. Under these circumstances, in order to hold the pallet firmly, the holder tends to be complicated and large. In addition, there are many types of pallets, and it was difficult to combine pallets of different sizes with the same device.
[0003]
[Problems to be solved by the invention]
The present invention was invented in view of the above-described state of the art, and when holding a pallet or the like, the center of gravity of the pallet or the like can be easily positioned on the rotation axis, and centrifugal force It is an object of the present invention to provide a centrifugal dewatering device such as a pallet that can easily suppress vibration due to sag.
[0004]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention employs technical means in which one diagonal line of a pallet or the like is held by holding means rotated by the rotating means, and the diagonal line of the pallet or the like is made coincident with the rotation axis. Since the center of gravity of a pallet or the like is generally located on the diagonal line, according to the technical means, the center of gravity of the pallet or the like is located on the rotation axis. Therefore, according to the present invention, shake due to centrifugal force can be easily suppressed. Here, the fact that the diagonal line of the pallet or the like is coincident with the rotational axis is not a strict meaning, and the diagonal line of the pallet or the like is substantially coincident with the rotational axis to avoid rotational imbalance. As long as the vibration due to the centrifugal force can be suppressed to an extent that does not hinder. If the pair of corners on the diagonal line of the pallet or the like is held by the holding means, the diagonal line of the pallet or the like can be easily aligned on the rotation axis. Needless to say, the rotation means may be configured to vary the rotation direction and / or the rotation speed.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
The present invention can be widely applied as dehydrating means for various pallets and the like. For example, it is suitable as a dehydrating means after a cleaning process such as an immersion type or a spray type, but can also be applied as a dehydrating means in other steps. Needless to say, the present invention can be applied not only to water but also to other liquids as long as it can be dehydrated by centrifugal force. In the case of a resin pallet, for example, there are many types of workpieces, such as a weight of 10 to 30 kg and a thickness of 130 to 150 mm. There are also two-way and four-way types for inserting the fork. As for how to hold the pallet, etc., as long as it can be stably held, holding means for holding only one of the upper and lower corners of the pallet may be used, but it is more stable to hold both the upper and lower corners. The structure is also simplified. The holding means for holding the upper and lower corners of a pallet or the like may be configured such that the lower holding means is not raised and lowered, and only the upper holding means is raised and lowered to hold or remove. In addition, the upper holding means may be lifted and lowered, and only the lower holding means may be lifted and lowered. Further, it is possible to configure both the holding means so as to be lifted and lowered together. As the lifting mechanism, the ball screw method is safe even when a heavy load is applied. It is also possible to use a drive cylinder. The installation state of the rotating shaft may be vertical, inclined or horizontal. It is also possible to configure the rotating shaft to be inclined simultaneously while rotating. In addition, since a pallet etc. can be hold | maintained only in two places, there are few concealed parts and there is little unwashed. The other corners are free so draining is good. You may comprise so that raising / lowering of a holding means and rotation of a pallet etc. may be performed by one motor. If hot air is blown simultaneously with centrifugal dehydration, workability can be improved. The rotation speed of the pallet or the like varies depending on the degree of scratches on the surface and the like. Carrying in / out of the pallet or the like may be performed manually, or may be performed automatically by providing a device that rises from a horizontal state and further tilts. Moreover, this centrifugal dehydration apparatus may be incorporated with a processing apparatus such as a cleaning apparatus, for example, or may be provided separately and lined with a carry-in / carry-out apparatus. It should be noted that workability is improved if the direction of the pallet or the like is aligned at the time of loading.
[0006]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram showing the main part of one embodiment of the present invention, and FIG. 2 is a schematic configuration diagram of the same embodiment as viewed from above. In the present embodiment, the case where the centrifugal dehydration apparatus according to the present invention is incorporated together with the pallet washing apparatus is illustrated. As shown in the drawing, a lower holding means 4 for holding a corner portion of the pallet 3 via a support member 2 is disposed at an inner lower portion of the machine body 1 formed of an outer wall for partitioning with the outside. The lower holding means 4 is fixed to the upper end of a rotating shaft 7 supported so as to be rotatable only through bearings 5 and 6, and drives a motor 11 through a belt 10 stretched between pulleys 8 and 9. The pallet 3 is configured to rotate by force. Further, an upper holding means 14 that is configured to be rotatable via a thrust bearing 13 is disposed at the lower end portion of an elevating shaft 12 that is configured to be movable up and down. It is comprised so that the other corner | angular part on a diagonal may be hold | maintained. A male screw is formed on the outer peripheral surface of the elevating shaft 12, and a ball screw mechanism 17 rotatably disposed between the thrust bearings 15 and 16 is engaged with the male screw. A pulley 18 is fixed to the ball screw mechanism 17 and is configured to be rotationally driven by a motor 21 via a pulley 19 and a belt 20.
[0007]
As shown in FIG. 2, in this embodiment, three sets of nozzles 22 to 27 are arranged so as to surround the pallet 3 inside the machine body 1. These nozzles 22-27 are each comprised so that a jetting direction can be changed, and regarding installation height, they are installed in the appropriate height with the favorable effect on injection. Among them, the nozzles 22 and 23 are first cleaning nozzles, and spray a first cleaning medium such as a cleaning liquid to which water or a detergent is added. The nozzles 24 and 25 are second cleaning nozzles, and inject a second cleaning medium such as heated water or steam mixed with air. The nozzles 26 and 27 are drying nozzles, and inject a drying medium such as hot air or room temperature air. Thus, when the pallet 3 is carried and held between the lower holding means 4 and the upper holding means 14, first, the first cleaning nozzles 22, 23 are sprayed with a cleaning liquid or the like to which water or detergent has been added. A cleaning operation using a cleaning medium is performed. Thereafter, if necessary, a cleaning operation using a second cleaning medium made of heated water or steam mixed with air from the second cleaning nozzles 24 and 25 is performed, and then a draining operation using centrifugal force is performed. In the case where the dirt is heavy in this cleaning operation, the water is only sprayed from the first cleaning nozzles 22 and 23, the heated water is only sprayed from the second cleaning nozzles 24 and 25, or the dirt is severe. First, water is sprayed from the first cleaning nozzles 22 and 23 to make it wet with respect to dirt, and then the cleaning liquid is sprayed from the first cleaning nozzles 22 and 23, and then the second cleaning. Heating water can be sprayed from the nozzles 24 and 25, and the cleaning medium can be variously combined. Further, in the draining operation, it is more efficient if a drying medium such as hot air or room temperature air is ejected from the drying nozzles 26 and 27. Note that the pallet 3 may be rotated at a low speed in the cleaning operation and may be switched to a high speed rotation in the draining operation. As shown in FIG. 2, shutters 28 and 29 for taking in and out of the pallet 3 are installed on one surface of the machine body 1 so as to be openable and closable.
[0008]
Next, the holding means for the pallet 3 will be specifically described. 3 and 4 show an embodiment relating to the holding means, showing a cross-sectional view taken along a plane perpendicular to the pallet placement surface and a cross-sectional view taken along a plane parallel to the pallet placement surface. It is a thing. Here, the case where it is applied as the lower holding means 4 is shown, but the same can be applied to the upper holding means 14. As shown in the figure, a base portion 30 constituting the lower holding means 4 is fixed to the upper end portion of the rotating shaft 7. As shown in FIG. 4, support members 31 and 32 are fixed to the base portion 30 at intervals, and the pallet is placed on the inclined portions 33 and 34 formed on the upper surfaces of the support members 31 and 32. It is comprised so that the corner | angular part of 3 may be supported. If the angle between the inclined portions 33 and 34 is set to be slightly larger than the right angle that is the angle of the corner portion of the pallet 3, it is easy to place and remove the pallet 3. Needless to say, the support members 31 and 32 may be configured to be detachable so that the inclined portions 33 and 34 can be replaced with ones that coincide with the contact surface of the pallet 3. Further, L-shaped members 35 and 36 that support both surfaces of the pallet 3 are rotatably disposed between the support members 31 and 32. These L-shaped members 35, 36 are rotatably supported via support shafts 37, 38 at portions extending left and right from the lower portions of the support members 31, 32. Abutting pieces 41 and 42 having flexibility are installed on the vertical piece portions 39 and 40 side of the L-shaped members 35 and 36 and are urged toward the pallet 3 side by springs 43 and 44. The horizontal pieces 45 and 46 of the L-shaped members 35 and 36 are pressed at the corners when the pallet 3 is placed, and rotate around the support shafts 37 and 38 together with the vertical pieces 39 and 40. And set to reach a horizontal state.
[0009]
Thus, when the pallet 3 is carried into the machine body 1 of the centrifugal dehydrator according to the present embodiment, as shown in FIG. 4, first, one corner portion of the pallet 3 constitutes the lower holding means 4. It is placed on the inclined portions 33 and 34 of the 31 and 32. At that time, as shown in FIG. 3, the horizontal pieces 45 and 46 of the L-shaped members 35 and 36 are pushed by the corners of the pallet 3, and rotate around the support shafts 37 and 38. Along with this rotation, the vertical piece portions 39 and 40 rotate inward to press the contact pieces 41 and 42 against both surfaces of the pallet 3. At that time, the urging force of the springs 43 and 44 acts to press the contact pieces 41 and 42 against both surfaces of the pallet 3, so that the pallet 3 is accurately held. Thereafter, as shown in FIG. 1, the ball screw mechanism 17 is rotated by the motor 21 via the belt 20 to lower the lifting shaft 12. As a result, the other corner portion of the pallet 3 on the diagonal line is held by the upper holding means 14 that is rotatably disposed at the lower end portion of the lifting shaft 12 via the thrust bearing 13. At that time, as in the case of the lower holding means 4, the L-shaped member constituting the upper holding means 14 is rotated by the upper corners of the pallet 3, and the contact pieces are pressed against both sides of the pallet 3 to be accurate. Will hold on.
[0010]
When the pallet 3 is held between the lower holding means 4 and the upper holding means 14 as described above, the rotating shaft 7 is rotated via the belt 10 by the motor 11, and the pallet 3 is moved via the lower holding means 4. While rotating, as described above, the cleaning operation is performed by first ejecting water or a cleaning liquid from the first cleaning nozzles 22 and 23. Next, a washing operation with heated water from the second washing nozzles 24 and 25 is performed, and the dirt adhering to the pallet 3 is removed. In addition, since the pallet 3 stands up, water and a washing | cleaning liquid are hardly collected in many recessed parts formed in the pallet 3, and it flows down. When the cleaning operation is completed, hot air or room temperature air is ejected from the drying nozzles 26 and 27, and the water draining operation is performed by increasing the rotational speed. During this time, the upper holding means 14 rotates freely via the thrust bearing 13. At the end of cleaning, a large number of water droplets adhere to the surface of the pallet 3 and gradually flow down along the surface of the pallet 3 due to gravity. At the time of centrifugal dewatering, centrifugal force acts on the water droplets that flow down along the surface of the pallet 3, and the water droplets are ejected from the released corners 3a, 3b and sides 3c, 3d. Further, the moisture in the inside of the pallet 3 and the inner portion held by the lower holding member 4 is also transferred to the outside through the ribs and the inner surface by the action of centrifugal force and is blown away. In the present embodiment, as described above, the lower holding means 4 and the upper holding means 14 support the pair of corners on the diagonal line of the pallet 3, so that the center of gravity of the pallet 3 is located on the rotation axis. Therefore, vibration due to centrifugal force can be almost suppressed. In the draining operation, as described above, it is more efficient to inject a drying medium such as hot air or room temperature air from the drying nozzles 26 and 27. Thus, when the draining operation is completed and the pallet 3 is unloaded, the motor 11 is stopped to stop the rotation of the pallet 3, and the motor 21 is reversed to raise the elevating shaft 12 so that the pallet 3 is lifted. After the upper holding means 14 is detached from the shutter 28, it is carried out from the shutters 28 and 29. When the pallet 3 is automatically loaded and unloaded, the motor 11 of the lower holding means 4 is adjusted so that the standby direction of the lower holding means 4 and the upper holding means 14 is aligned with the direction suitable for loading the pallet 3. The rotation stop position is determined, and when the engagement with the pallet 3 is disengaged, the upper holding means 14 is prevented from rotating so as to be always kept in a predetermined direction.
[0011]
FIG. 5 is a cross-sectional view showing another embodiment of the holding means for holding the corners of the pallet 3 in a plane perpendicular to the mounting surface of the pallet. In the holding means 47 according to the present embodiment, the support member 48 is formed with a concave portion 49 that can accommodate the corner portion of the pallet 3, and the support member 48 is pivotally attached to one surface forming the concave portion 49 by the support shaft 50. A contact piece 51 was provided and urged toward the pallet 3 by a spring 52. The concave portion 49 may be a concave portion having a V-shaped cross section corresponding to the corner portion of the pallet 3 or a rectangular concave portion. In this embodiment, when the corner portion of the pallet 3 is inserted into the recess 49, the contact piece 51 rotates against the spring 52, and the pallet 3 is moved to the other surface of the recess 49 by the urging force of the spring 52. It is pushed to the side and is held accurately. In addition, although the center of the thickness direction may shift | deviate from the axial center of the rotating shaft 7 a little depending on the thickness of the pallet 3, there is no special trouble in operation. The present invention can also be applied to a work such as a tray container having a rectangular shape like a pallet.
[0012]
【The invention's effect】
In this invention, since it comprised so that it might hold | maintain on diagonal lines, such as a pallet, since the gravity center of pallets etc. is located on a rotating shaft center, the shake | fluctuation by a centrifugal force can be suppressed simply and exactly. Therefore, it is safe even when rotating at high speed, and work efficiency can be improved. In addition, by holding a pair of corners on a diagonal line, the center of gravity of a pallet or the like can be easily aligned with the rotation axis, so that the positional deviation that has become a problem in conventional holding operations can be solved accurately. .
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing a main part of an embodiment of the present invention.
FIG. 2 is a schematic configuration diagram of the embodiment as viewed from above.
FIG. 3 is a cross-sectional view of an embodiment relating to the holding means, taken along a plane perpendicular to the mounting surface of the pallet.
FIG. 4 is a cross-sectional view of the same embodiment taken along a plane parallel to the mounting surface of the pallet.
FIG. 5 is a cross-sectional view of another embodiment relating to the holding means, taken along a plane perpendicular to the mounting surface of the pallet.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Airframe, 2 ... Support member, 3 ... Pallet, 4 ... Lower holding means, 5, 6 ... Bearing, 7 ... Rotating shaft, 8, 9 ... Pulley, 10 ... Belt, 11 ... Motor, 12 ... Lifting shaft, 13 ... thrust bearing, 14 ... upper holding means, 15, 16 ... thrust bearing, 17 ... ball screw mechanism, 18, 19 ... pulley, 20 ... belt, 21 ... motor, 22, 23 ... first cleaning nozzle, 24, 25 ... Second cleaning nozzle, 26, 27 ... drying nozzle, 28, 29 ... shutter, 30 ... base portion, 31, 32 ... support member, 33, 34 ... inclined portion, 35, 36 ... L-shaped member, 37, 38 ... support shaft, 39,40 ... vertical piece, 41,42 ... contact piece, 43,44 ... spring, 45,46 ... horizontal piece, 47 ... holding means, 48 ... support member, 49 ... concave, 50 ... Support shaft 51 ... Contact piece 52 ... Spring

Claims (3)

A holding means for holding a pallet or the like, and a rotating means for rotating the holding means together with the pallet or the like, the holding means holding one diagonal line of the pallet or the like so as to coincide with the rotation axis. Centrifugal dehydration equipment such as pallets. The centrifugal dewatering apparatus for a pallet or the like according to claim 1, wherein the holding means holds a pair of corners on a diagonal line of the pallet or the like. The centrifugal dewatering apparatus for a pallet or the like according to claim 1 or 2, wherein the rotation means is configured to be variable in rotation direction and / or rotation speed.

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