JP2004035223A - Lifting transfer device for load - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase lifting speed and improve transfer efficiency by reducing shock at the upper and lower stop position of a transfer conveyor. <P>SOLUTION: Shaft projected to a drive chain 33 circulating between a driving sprocket 28 and a driven sprocket 30 up and down, rotates around the periphery of both sprockets 28, 30, and moves to the top dead point or the bottom point. At that time, a transfer conveyor 7 integrally lifting with a lifting board 20 reduces its lifting speed near the upper and lower limit position and prevents the sudden stop because it moves forward in the guide hole 41 of the lifting board 20. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a lifting device for lifting and lowering a load received from one of conveyors arranged in a plurality of upper and lower stages and transferring the load to another conveyor.
[0002]
[Prior art]
As this type of conventional elevating / transferring device, for example, as disclosed in Japanese Patent Application Laid-Open No. H11-334865, a transfer lifter for raising and lowering a load and transferring the load is mounted on a vertical screw shaft rotated by a motor. And a pallet support for raising and lowering a load is raised and lowered by a pantograph type lifting means, as disclosed in Japanese Patent Application Laid-Open No. 2002-114374.
[0003]
[Problems to be solved by the invention]
In any of the above-mentioned conventional apparatuses, it is difficult to increase the lifting speed of the lifter or the pallet support base due to the structure thereof, and the load transfer efficiency is poor.
[0004]
In order to solve this problem, it is conceivable to increase the rotation speed of driving means such as a motor.However, in this case, the lifter and the pallet support stand suddenly stop at the upper and lower stop positions, and the load collapses due to the impact. Etc. may occur. If the rotation speed of a motor or the like is controlled to prevent this, the control system becomes complicated and the cost increases. Further, there is also a problem that none of the above-mentioned conventional apparatuses can easily adjust the vertical stop positions of the lifter and the pallet support.
[0005]
The present invention has been made in order to solve the above-described problems, and can reduce a shock at an upper and lower stop position, thereby increasing a lifting speed and improving a transfer efficiency, and It is an object of the present invention to provide an apparatus for lifting and lowering a load, which can easily adjust the upper and lower stop positions of the transfer conveyor.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the load elevating and lowering transfer position of the present invention is provided at least at the front end of a two-stage vertical conveyor, and lifts and lowers a load sent by one of the conveyors. A lifting and lowering transfer device for transferring a load to a conveyor of
A plurality of base pillars erected on the side adjacent to the front ends of the two conveyors, the plurality of base pillars being capable of ascending and descending and being supported by the base pillars in the same direction as the conveyor, and being rotated around an axis pointing in the left-right direction. A transfer conveyer having rollers, and elevating means for elevating and lowering the transfer conveyer, the elevating means being pivotally attached to the base support, and being driven by a motor to rotate around an axis oriented in the left-right direction; A driven sprocket pivotally attached to the drive sprocket vertically and a drive chain looped around the two sprockets, and a shaft protruding from a part of the drive chain is connected to the transfer conveyor. And the drive chain is loosely fitted in the front-rear direction guide hole of the elevating member provided at the side end on the side of the base post, and the shaft part is located at the top dead center between the two sprockets. By rotating the robot until it is located at the bottom dead center, the transfer conveyor is moved up and down between an upper limit position and a lower limit position which are almost at the same height as the upper and lower conveyors and are close to each other. I have.
According to the present invention having the above-described configuration, when the shaft that moves together with the drive chain turns around the outer periphery of the driving and driven sprockets and moves to the top dead center or the bottom dead center, the shaft moves in the front-rear direction in the guide hole of the lifting member. , The lifting speed near the upper and lower limit positions of the transfer conveyor that moves up and down integrally with the lifting member is reduced, and a sudden stop is prevented.
[0007]
In the above elevating / transferring device, a support having guide rollers slidably contacting a plurality of upper and lower portions on both front and rear surfaces and left and right side surfaces thereof is provided on the base support so as to be able to move up and down, and a plurality of horizontal support rods protruding to the side are provided. It is preferable that a transfer conveyor be placed on the transfer belt.
With this configuration, the support and the transfer conveyor placed on the support can be smoothly and stably moved up and down by the action of the plurality of guide rollers slidingly contacting the base support. Further, since the transfer conveyor is provided on the base support via the support, the structure of the transfer conveyor is simplified, and a highly versatile conveyor can be used.
[0008]
In the lifting and lowering and transferring apparatus, the driving sprocket and the driven sprocket are pivotally attached to a base support so as to be movable up and down, and a plurality of idler sprockets are pivotally attached to an appropriate position of the base support so as to be movable up and down. Preferably, the drive chain is looped around the driven sprocket and the plurality of idler sprockets.
In this way, the distance between the drive and driven sprockets can be adjusted according to the height of the upper and lower conveyors, and the upper and lower stop positions of the transfer conveyor can be easily changed.
[0009]
In the lifting and lowering transfer device, it is preferable that the drive chain is wound around one of the idler sprocket and the drive sprocket in a U-shape.
By doing so, the adjustment range of the separation dimension between the driving and driven sprockets can be expanded. Further, since the engagement between the drive sprocket and the drive chain increases, a large torque can be transmitted.
[0010]
In the above elevating / lowering transfer device, it is preferable that the driving and driven sprockets are provided with adjusters for adjusting the vertical position.
With this configuration, the vertical position of the driving and driven sprockets can be finely adjusted by the adjuster. Therefore, even if an assembling error occurs at an installation site or the like, the position of the transfer conveyor and the upper and lower conveyors can be adjusted. Can be done accurately.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0012]
FIG. 1 is a front view of a load lifting / transferring apparatus 1 of the present invention, FIG. 2 is a side view of the same, and FIG. 3 is a cross-sectional plan view taken along line III-III of FIG.
[0013]
Reference numerals 2 and 3 denote a carry-in roller conveyor (hereinafter abbreviated as a carry-in conveyor) and a carry-out roller conveyor (hereinafter abbreviated as a carry-out conveyor) for the load W. (To be described with the right side as the front), and are horizontally installed with a predetermined distance therebetween.
[0014]
The carry-in and carry-out conveyors 2 and 3 are configured by pivotally supporting a plurality of rollers 5 rotating about an axis extending in the left-right direction at predetermined intervals between a pair of parallel left and right frames 4. The roller 5 is rotated by a motor housed in a cross member (not shown) and a belt wound around each roller 5 so that the carry-in conveyor 2 rotates clockwise in a side view and the carry-out conveyor 3 rotates counterclockwise. It is designed to be driven.
[0015]
The elevating / transferring device 1 includes a base frame 6 installed on a floor on the right side close to the front ends of the two conveyors 2 and 3, a transferring conveyer 7, and an elevating drive mechanism 8 as elevating means. I have.
[0016]
The base frame 6 is coupled between a pair of front and rear base legs 9, 9 fixed to the floor and facing in the left-right direction, and their right ends (the left ends in FIG. 3). Is formed on the right side of the base support 10 having a substantially U-shaped cross-section when viewed vertically when viewed from above, and is formed in an L-shape when viewed from the front. 11 is a reinforcing plate.
[0017]
The transfer conveyor 7 includes a pair of left and right frames 12, 12, and a plurality of rollers 13 rotatably rotating around a horizontal axis at predetermined intervals. By the driving force of a motor 15 housed in a cross member 14 coupled between the rollers 12, the rollers 13 rotate clockwise or counterclockwise in a side view via belts 16 wound around pulleys 13a at the side ends of the rollers 13. It is made to be made.
[0018]
The left and right widths of the transfer conveyor 7 are set substantially equal to the left and right widths of the upper and lower conveyors 2 and 3. Reference numeral 17 denotes a support for the transfer conveyor 7, which has a U-shape facing outward in a plan view, and a pair of front and rear vertical support rods 18, 18 facing each other with a distance slightly larger than the front-rear dimension of the base post 10. A pair of front and rear downward U-shaped horizontal supports slightly fixed to the left and right dimensions of the transfer conveyor 7 and horizontally fixed to the upper left side surface (the right side surface in FIGS. 1 and 3). The vertical supporting rods 18 are provided with a lifting plate 20 coupled between lower ends of right side surfaces of the vertical supporting rods 18, and have a U-shape in a right direction in plan view so as to surround the base support 10.
[0019]
A reinforcing plate 21 is fixed to the lower corner of the joint between the vertical support rod 18 and the horizontal support rod 19. A first guide roller 22 that rotates around an axis facing the front-rear direction is provided on a facing surface of the lower end portions of the two reinforcing plates 21 at front and rear end portions of the left side surface (the right side surface in FIGS. 1 and 3) of the base support 10. It is pivotally supported so that it can slide on it.
[0020]
Also, on the opposing surfaces of the support pieces 18a, 18b provided at the upper and lower ends of the front and rear vertical support rods 18, similarly to the above, second guide rollers 23, 24 that rotate around an axis in the front-rear direction are provided. It is pivotally supported so as to be able to slide on the right side surface (the left side surface in FIGS. 1 and 3) of the inward piece 10 a of the base support 10.
[0021]
Further, a pair of upper and lower third guide rollers 25, 25 rotating about an axis in the left-right direction are provided on the upper and lower ends of the left side surface of the front and rear vertical support rods 18, respectively. It is pivotally mounted so that it can slide on.
[0022]
By bringing the first to third guide rollers 22, 23, 24, 25 into sliding contact with the outer peripheral surfaces of the front and rear ends of the base support 10, the support 17 is stably moved up and down along the base support 10. be able to.
[0023]
On the upper surface of the front and rear horizontal support rods 19 of the support 17, the intermediate portions of the left and right frames 12 of the transfer conveyor 7 are placed orthogonally so as to be aligned with the carry-in and carry-out conveyors 2 and 3 in the front-rear direction, It is bolted from below.
[0024]
The lifting drive mechanism 8 includes a drive motor 27 attached to the lower portion of the left side (right side in FIG. 3) of the base support 10 via two support plates 26, 26 sandwiching the base support 10, and the base support 10 And a driven sprocket 30 having a diameter substantially the same as that of the drive sprocket 28 mounted via a support plate 29 on the right side surface of the base post 10 above the drive sprocket 28. And three small-diameter idler sprockets 32 attached to the base support 10 in front of the two sprockets 28 and 30 via a bracket 31, and two upper and lower idlers in front of the drive and driven sprockets 28 and 30. A drive chain 33 wound around the sprocket 32 and wound around the middle idler sprocket 32 in an inverted U-shape.
[0025]
The vertical positions of the driving motor 27, the driving sprocket 28, and the driven sprocket 30 are determined by selecting a plurality of mounting holes 34 drilled at predetermined intervals in the base support 10 and mounting the support plates 26, 29. By changing the position, it can be changed.
[0026]
Further, the support plates 26 and 29 are attached via vertically elongated holes 35 formed in the base column 10 and are screwed into brackets 36 fixed to the upper and lower base columns 10. Since the bolt 37 is in contact with the lower support plate 26 at the lower end thereof, and the upper support plate 29 is screwed into the outward piece 29a at the upper end thereof, the adjuster bolt 37 is operated to support the support plate 26. , 29 in the vertical direction, the relative position of the driving and driven sprockets 28, 30 can be finely adjusted.
[0027]
Since the bracket 31 of each idler sprocket 32 is also mounted via the vertically oriented long hole 35 formed in the base support 10, even when the vertical position and the relative interval of the driving and driven sprockets 28 and 30 are adjusted, By changing the vertical position of each idler sprocket 32 correspondingly, it is possible to prevent the drive chain 33 from becoming slack or short in length. In particular, since the drive chain 33 is wound around the middle idler sprocket 32 in an inverted U-shape, the middle idler sprocket 32 can be moved downward even if the relative distance between the drive and driven sprockets 28 and 30 is large. By doing so, it is possible to respond sufficiently.
[0028]
In addition, since the intermediate idler sprocket 32 is mounted above the drive sprocket 28 and the drive chain 33 is wound around the drive sprocket 28 in an inverted U-shape, the drive chain 33 is wound around the drive sprocket 28 almost half way. By increasing the meshing, a large torque (driving force) can be transmitted to the driving chain 33, and by moving the intermediate idler sprocket 32 in the vertical direction, the separation between the driving and driven sprockets 28 and 30 is increased. The size adjustment range can be expanded.
[0029]
As shown in detail in FIG. 4, a bracket 38 is fixed to one portion of the drive chain 33 so as to face rightward, and a bearing roller 40 is rotatably fitted to a horizontal support shaft 39 at the right end thereof. I have.
[0030]
The bearing roller 40 is rotatably fitted in a guide hole 41 formed in the front and rear direction formed near the rear of the elevating plate 20 so as to sandwich the elevating plate 20 between two left and right washers 42. 43 is a mounting screw.
[0031]
As shown in FIG. 2, the size of the guide hole 41 is slightly larger than the radius of the driving and driven sprockets 28 and 30, and the front end position is equal to or slightly equal to the line connecting the centers of the sprockets 28 and 30. It is located forward.
[0032]
At the rear ends of the upper and lower support plates 26, 29, two proximity sensors 44, 44 for detecting the upper limit position and the lower limit position are attached. Two detection pieces 45, 45 for turning on and off 44 are attached.
[0033]
A light reflection type sensor 46 for detecting the presence / absence of a load on the upper surface of the transfer conveyor 7 is attached to the lower surface of the transfer conveyor 7 such that the optical axis is located in the gap between the rollers 13 (see FIG. 3). ). A cover 47 covers the right side surface and the front and rear surfaces of the base support 10.
[0034]
Next, the operation when the load W sent by the carry-in conveyor 2 is transferred to the lower carry-out conveyor 3 using the lifting and lowering transfer device 1 of the above embodiment will be described.
[0035]
After adjusting the vertical position of all the sprockets 28, 30, and 32 so that the transfer conveyor 7 is at substantially the same height as the carry-in and carry-out conveyors 2 and 3 at the upper and lower positions, the drive sprocket 28 is moved from the side view. 2 by rotating the drive chain 33 in the direction shown in FIG. 2 to raise the lift plate 20 associated therewith to the upper limit position where the proximity sensor 44 operates. As shown by the dashed line, the robot stands by at the upper limit position.
[0036]
Next, the load W conveyed from the carry-in conveyor 2 is drawn into the transfer conveyor 7 by the rotation of each roller 13 and transferred, and when this is detected by the sensor 46, the drive motor 27 operates to drive the drive sprocket. 28 rotates counterclockwise in a side view, and the vertical straight portion of the drive chain 33 runs downward, so that the transfer conveyor 7 descends together with the support 17 including the lifting plate 20 associated therewith, When reaching the lower limit position where the lower proximity sensor 44 operates, the drive motor 27 stops.
[0037]
At this time, immediately before the elevating plate 20 reaches the lower limit position, the bearing roller 40 of the bracket 38 that rotates together with the drive chain 33 as shown in FIG. To the point, and further forward into the guide hole 41 of the elevating plate 20, so that the descending speed of the elevating plate 20 gradually decreases.
[0038]
As a result, the descending speed near the lower limit position of the transfer conveyor 7 is reduced, and a sudden stop is prevented.
[0039]
When the transfer conveyor 7 stops at the lower limit position, the rollers 13 of the transfer conveyor 7 rotate counterclockwise in side view, and the load W is sent to the unloading conveyor 3.
[0040]
When the sensor 46 detects that the load W has been sent out, the drive motor 27 is again rotated in the reverse direction to raise the transfer conveyor 7 to the upper limit position.
[0041]
Just before the lifting plate 20 reaches the upper limit position, the bearing roller 40 moves further forward from the top dead center in the guide hole 41 in the same manner as described above. The ascending speed is reduced to prevent a sudden stop.
[0042]
As described above, when the stop speed at the upper and lower limit positions of the transfer conveyor 7 is reduced, the traveling speed of the drive chain 33 is increased, and the vertical speed of the vertical linear portion can be increased. Transfer efficiency can be improved.
[0043]
The present invention can be used not only for transferring the load W from the upper conveyor 2 to the lower conveyor 3 but also for transferring the load W from the lower conveyor 3 to the upper conveyor 2 as described above. Of course, the present invention can also be applied to the transfer method shown in FIG.
[0044]
That is, upper and lower two-stage carry-in conveyors 48 and carry-out conveyors 49 are provided on both front and rear sides of the lifting / lowering transfer device 1 of the present invention, and the load W of the upper carry-in conveyor 48 is transferred via the transfer conveyor 7 to the lower front. , And the load W of the lower loading conveyor 48 is transferred to the upper upper loading conveyor 49, or, conversely, the load W is transferred from the front conveyor 49 to the rear conveyor 48. You can also put on.
[0045]
【The invention's effect】
According to the present invention, the following effects can be obtained.
[0046]
(A) According to the first aspect of the present invention, when the shaft that moves up and down together with the drive chain moves to the top dead center or the bottom dead center between the driving and driven sprockets, the shaft moves inside the guide hole of the lifting member. Since the transfer conveyor moves up and down integrally with the elevating member, when the transfer conveyor reaches the upper and lower limit positions, the ascending and descending speed is automatically reduced, thereby preventing a sudden stop.
Therefore, even if the traveling speed of the drive chain is increased to increase the elevating speed of the transfer conveyor, load collapse does not occur, and the load transfer efficiency can be improved.
[0047]
(B) According to the second aspect of the present invention, the support and the transfer conveyor mounted on the support are smoothly and stably moved up and down by the action of the plurality of guide rollers rolling in sliding contact with the base support. I do.
Further, since there is no need to directly link the transfer conveyor to the base support, the structure of the transfer conveyor is simplified, and a highly versatile conveyor can be used.
[0048]
(C) According to the third aspect of the invention, the distance between the drive and driven sprockets is adjusted in accordance with the height of the upper and lower conveyors, and the upper and lower stop positions of the transfer conveyor are easily changed. be able to.
[0049]
(D) According to the invention described in claim 4, by moving the idler sprocket wound in a U-shape in the vertical direction, the adjustment range of the separation dimension between the driving and driven sprockets can be expanded.
Further, since the engagement between the drive sprocket and the drive chain increases, a large torque can be transmitted to the drive chain.
[0050]
(E) According to the fifth aspect of the present invention, the vertical position of the driving and driven sprockets can be finely adjusted by the adjuster. Can be accurately and easily performed.
[Brief description of the drawings]
FIG. 1 is a front view of a load lifting / transferring apparatus according to the present invention.
FIG. 2 is also a right side view.
FIG. 3 is an enlarged cross-sectional plan view taken along the line III-III of FIG. 2;
FIG. 4 is a longitudinal sectional view of a fitting portion between a bearing roller of a shaft protruding from a drive chain and a guide hole of a lifting plate.
FIG. 5 is a schematic side view illustrating a deceleration action when the lifting plate reaches a lower limit position.
FIG. 6 is a schematic side view showing another transfer example using the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Load lifting / transferring apparatus 2 Load-in conveyor 3 Load-out conveyor 4 Frame 5 Roller 6 Base frame 7 Transfer conveyor 8 Lifting drive mechanism (lifting means)
9 Base leg 10 Base support 10a Inward piece 11 Reinforcement piece 12 Frame 13 Roller 13a Pulley 14 Cross member 15 Motor 16 Belt 17 Support 18 Vertical support rods 18a, 18b Support piece 19 Horizontal support rod 20 Lifting plate (elevating member)
21 Reinforcement Plate 22, 23, 24, 25 Guide Roller 26 Support Plate 27 Drive Motor 28 Drive Sprocket 29 Support Plate 30 Driven Sprocket 31 Bracket 32 Idler Sprocket 33 Drive Chain 34 Mounting Hole 35 Slot 36 Bracket 37 Adjuster Bolt 38 Bracket 39 Support Shaft 40 Bearing roller 41 Guide hole 42 Washer 43 Mounting screw 44 Proximity sensor 45 Detection piece 46 Sensor 47 Cover 48 Carry-in conveyor 49 Carry-out conveyor W Load

Claims (5)

A load lifting and lowering transfer device provided at least at the front end of a two-stage conveyor in the front-rear direction to lift and lower a load sent by one conveyor and transfer the load to the other conveyor,
A plurality of base pillars erected on the side adjacent to the front ends of the two conveyors, the plurality of base pillars being capable of ascending and descending and being supported by the base pillars in the same direction as the conveyor, and being rotated around an axis pointing in the left-right direction. A transfer conveyer having rollers, and elevating means for elevating and lowering the transfer conveyer, the elevating means being pivotally attached to the base support, and being driven by a motor to rotate around an axis oriented in the left-right direction; A driven sprocket pivotally attached to the drive sprocket vertically and a drive chain looped around the two sprockets, and a shaft protruding from a part of the drive chain is connected to the transfer conveyor. And the drive chain is loosely fitted in the front-rear direction guide hole of the elevating member provided at the side end on the side of the base post, and the shaft part is located at the top dead center between the two sprockets. The transfer conveyor is moved up and down between an upper limit position and a lower limit position, which are almost at the same height as the upper and lower conveyors by rotating the robot until it is located at the bottom dead center. Equipment for lifting and lowering loads. A support having guide rollers slidably contacting a plurality of upper and lower portions of the front and rear surfaces and the left and right sides thereof is provided on the base support so as to be able to move up and down, and the transfer conveyor is mounted on a plurality of horizontal support rods protruding to the side. The load elevating and lowering device according to claim 1. A drive sprocket and a driven sprocket are pivotally attached to a base support so as to be able to move up and down, and a plurality of idler sprockets are pivotally mounted at an appropriate position on the base support so as to be able to move up and down. 3. The apparatus according to claim 1, wherein the drive chain is wound around the sprocket. 4. The apparatus according to claim 3, wherein the drive chain is wound around one of the idler sprocket and the drive sprocket in a U-shape. 5. The load elevating / lowering apparatus according to claim 1, wherein the drive and driven sprockets are provided with adjusters for adjusting the vertical position.

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