JP2004075350A - Lifting mechanism for lifting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lifting mechanism for a small-sized lifting device, capable of positioning a winding core at an exact height. <P>SOLUTION: This lifting mechanism comprises a protruding guide portion 8 with angle cross section provided on both sides of a second-stage sliding member 5; a first guide surface 90 which is formed on both sides of a fixed member 4 and faces one inclined surface 80 of the protruding guide portion 8; a second guide surface 91 which is formed on both sides of a third-stage sliding member 6 and and faces the other inclined surface 81 of the protruding guide portion 8; and a plurality of linear movement bearings 10a, 10b between one inclined surface 80 of the protruding guide portion 8 and the first guide surface 90 and between the other inclined surface 81 of the protruding guide portion 8 and the second guide surface 91. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an elevating mechanism of a lift device mounted on an automatic guided vehicle (AGV) or the like that transports a winding core or the like unattended and supports the winding core or the like at a predetermined height.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, it is well-known that an unmanned transport vehicle (AGV) that transports a conveyed object such as a winding core unattended is equipped with a lift device that supports the conveyed object at a predetermined height. The lifting mechanism of such a lift device lifts a transported object by using a hydraulic cylinder as a drive source and supports the transported object at a predetermined height. In particular, when the core is transported to the next process by an automatic guided vehicle, it is necessary to hold the core at an accurate height position.
[0003]
As a lifting mechanism of the lift device used for lifting and lowering the core, for example, a pantograph-type mechanism, or a receiving portion for receiving the core is formed at the tip of an operating rod of a hydraulic cylinder fixed to an automatic guided vehicle. The operation rod can be guided straight in the vertical direction by a linear motion bearing. Alternatively, as shown in an example of a slide fork of a stacker crane, a relay member is engaged with a fixing member fixed to an automatic guided vehicle so as to be able to move up and down, and a tip member that receives a core is vertically movable. A combined multi-stage mechanism can be applied.
[0004]
[Problems to be solved by the invention]
However, when the lifting mechanism exemplified above is applied, there are the following problems. That is, the pantograph mechanism is composed of a plurality of links joined to each other via a plurality of slides, and some play is indispensable for each slide. For this reason, it is difficult to operate precisely, and it is also difficult to repeatedly and accurately position the core at the target height.
[0005]
Although the positioning of the core by the hydraulic cylinder and the accuracy of holding it are high compared to the pantograph mechanism, the hydraulic cylinder has a minimum dimension when it is shortened and a maximum dimension when it is extended. The ratio is small. For this reason, if the elevating stroke is set to be large, the minimum dimension increases accordingly, which hinders downsizing of the entire elevating mechanism.
[0006]
Further, the multi-stage mechanism including the fixing member, the relay member, and the distal end member is configured to be mutually guided vertically by a plurality of guide rollers interposed between these members. For this reason, a certain degree of play is indispensable between the above-mentioned fixing member, relay member or tip member and each guide roller, and the same problem as in the above-mentioned pantograph mechanism occurs.
[0007]
Accordingly, an object of the present invention is to provide a lifting mechanism of a small-sized lifting device capable of positioning a winding core at an accurate height.
[0008]
[Means for Solving the Problems]
The elevating mechanism of the lift device according to the present invention is configured such that one sliding member is slidably engaged with a fixed member provided with a driving source in a vertical direction, and another sliding member is vertically slid on the one sliding member. The first sliding member and the other sliding member are slidably engaged with each other and vertically moved by the drive source. The feature is that it is provided in a posture extending in the vertical direction on both sides of the one sliding member, and a convex guide portion having a mountain-shaped cross section protruding from both sides of the one sliding member; And a first guide surface facing one inclined surface of the ridge guide portion, and a first guide surface provided on both sides of the other sliding member so as to extend vertically. A second guide surface facing the other inclined surface, between the convex guide portion and the first guide surface, and between the convex guide portion and the second guide surface, It is provided with a plurality of linear motion bearings for vertically guiding the fixed member, the one sliding member and the other sliding member to each other.
[0009]
Further, the lifting mechanism of the lift device includes a cylinder in which the driving source is fixed to the fixing member in an upright posture, an operating rod that moves back and forth from the cylinder to raise and lower the one sliding member, and the one sliding member. A supported sprocket; and a chain having one end connected to the fixed member and the other end connected to the other sliding member.
[0010]
Further, in the lifting mechanism of the lift device, the cylinder is a telescopic cylinder.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
An elevating mechanism of a lift device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view of a lift device 1 and a lifting mechanism 2 according to the present embodiment. FIG. 2 shows an AA cross section of FIG. FIG. 3A is a side view of the lift device 1, and FIG. 3B is a schematic diagram illustrating a configuration of the lifting mechanism 2.
[0012]
As shown in FIGS. 1 to 3, the elevating mechanism 2 of the lift device 1 moves the one sliding member 5 located at the second stage to the fixed member 4 provided with the driving source 3 in the vertical direction indicated by the arrow Y. Slidably engages, one slide member 5 is slidably engaged with another slide member 6 located at the third stage in the up-down direction, and the other slide member 6 slides at the fourth stage. This is a device in which a member 7 is slidably engaged in a vertical direction, and these sliding members 5, 6, 7 are vertically moved by a driving source 3, respectively.
[0013]
Specifically, as shown in FIG. 2, the elevating mechanism 2 includes a convex guide portion 8 having a mountain-shaped cross section provided on both sides of one sliding member 5 and a convex guide portion 8 provided on both sides of the fixed member 4. A first guide surface 90 facing one inclined surface 80, a second guide surface 91 provided on both sides of another sliding member 6 and facing the other inclined surface 81 of the ridge guide portion 8, and one inclined surface There are four (one set of two) linear motion bearings 10a and 10b interposed between the first guide surface 90 and the other inclined surface 81 and the second guide surface 91, respectively. . The linear motion bearing 10c in the figure will be described later.
[0014]
The two sides of each of the sliding members 5 and 6 are two portions separated in the width direction indicated by the arrow X. The fixing member 4 is formed by welding a pair of angle steel members 41 and reinforcing ribs 42 to each other in the width direction on the surface of a fixed steel plate 40 fixed in an upright posture to a chassis (not shown) of the automatic guided vehicle. The sliding member 5 is formed by bending a steel plate so that its cross-sectional shape is like a groove. Similarly, the sliding members 6 and 7 are each formed by bending a steel plate into a groove shape, but are different from the sliding member 5 in dimensions.
[0015]
At the upper end of the sliding member 7, a core receiving portion 71 for receiving the core 70 is fixed. As shown in FIG. 4, the core receiving portion 71 fixes a steel rectangular parallelepiped 72 wider than the sliding member 7 to the upper end of the sliding member 7, and horizontally places the core 70 on the upper surface of the steel rectangular parallelepiped 72. It is formed by welding a receiving steel plate 73 having a trough-shaped (V-shaped) cross section, which is dropped and positioned in a posture. The lift device 1 operates the lifting mechanism 2 by the drive source 3 to raise and lower the core 70 together with the core receiving portion 71 or hold the core 70 at a predetermined height.
[0016]
As shown in FIG. 2, the ridge guide portion 8 is formed by assembling and welding a plurality of steel plates so as to form an approximately isosceles triangular cross-sectional shape. The sliding members 5 are respectively fixed to both sides of the sliding member 5 so as to extend vertically. The apex angle θ of the ridge guide 8 is not particularly limited, but is preferably set in the range of 60 to 90 °.
[0017]
The first guide surface 90 is formed as follows. That is, a pair of hollow rails 92 obtained by assembling and welding a plurality of steel plates so as to form a substantially trapezoidal cross-sectional shape are respectively extended in the vertical direction, and the pair of hollow rails 92 are fixed. The members 4 are respectively fixed to the outer surfaces of the angle steel materials 41 on both sides. In this state, one surface of the hollow rail 92 facing in parallel with the one inclined surface 80 becomes the first guide surface 90.
[0018]
The second guide surface 91 is formed as follows. That is, a pair of hollow rails 93 obtained by assembling and welding a plurality of steel plates so as to form a substantially trapezoidal cross-sectional shape, each in a posture extending in the up-down direction, and then, the pair of hollow rails 93, other Are fixed to both sides of the sliding member 6 of FIG. In this state, one surface of the hollow rail 93 facing the other inclined surface 81 in parallel becomes the second guide surface 91. The first and second guide surfaces 90 and 91 are surfaces that are inclined so that the interval between them gradually decreases inward in the width direction and the interval gradually increases outward in the width direction.
[0019]
As the linear motion bearings 10a and 10b, for example, bearings that linearly move on a track using balls or rollers as rolling elements, such as linear ball bearings, are used. As an advantage of applying such linear motion bearings 10a and 10b, the linear motion bearings 10a and 10b are so arranged that they can fit in a slight gap between the ridge guide portion 8 and the first and second guide surfaces 90 and 91. In addition to being small and thin, the friction is small compared with the sliding guide and the stick-slip phenomenon (self-excited vibration) does not occur, so that a very smooth and highly accurate sliding operation is possible.
[0020]
As shown in FIG. 1, the linear motion bearing 10a in FIG. 2 includes a guide rail 11a having a full length extending over the upper and lower ends of the fixing member 4, and two sliders 12 closely engaging with the guide rail 11a. It is composed of As shown in FIG. 1, the linear motion bearing 10b in FIG. 2 includes a full length guide rail 11b extending over both upper and lower ends of one sliding member 6, and two sliders 12 which are closely engaged with the guide rail 11b. It is composed of
[0021]
A linear motion bearing 10c is provided on the back surface of each of the pair of hollow rails 93 opposite to the second guide surface 91, and the other sliding member 7 is vertically moved via the two (one set) of linear motion bearings 10c. It is slidably engaged in the direction. As shown in FIG. 1, the linear motion bearing 10c shown in FIG. 2 includes a full length guide rail 11c extending over the upper and lower ends of the other sliding member 6, and two sliders 12 which are closely engaged with the guide rail 11c. It is composed of
[0022]
As shown in FIG. 1, the two sliders 12 described above are arranged two by two vertically. This is for reliably preventing the sliding member 5 with respect to the fixed member 4 and the sliding member 6 with respect to the sliding member 5 from swinging with any one of the sliders 12 as a fulcrum. .
[0023]
As shown in FIG. 3A, the drive source 3 includes a cylinder 30 fixed to the fixed member 4 in an upright posture, and a sliding member 5 which advances and retreats from the cylinder 30 by hydraulic pressure or pneumatic pressure supplied into the cylinder 30. And a transmission mechanism 32 for transmitting the output of the operation rod 31 from the sliding member 5 to the sliding members 6 and 7. The drive source 3 is a hydraulic or pneumatic cylinder, and preferably employs a telescopic cylinder in which a relay cylinder 33 that moves further forward and backward is disposed between the cylinder 30 and the operating rod 31.
[0024]
As shown schematically in FIG. 3B, the transmission mechanism 32 connects a first sprocket s1 supported by one sliding member 5 and one end e10 wound around the first sprocket s1 to the fixed member 4. The first chain c1 having the other end e11 connected to the other sliding member 6, the second sprocket s2 supported by the other sliding member 6, and the one end e20 wound around the second sprocket s2 to the one sliding member 5. A second chain c2 which is connected to the other end e21 and connected to the fourth-stage sliding member 7.
[0025]
FIG. 3A shows the connection between the first and second chains c1 and c2 and the fixed member 4 or the sliding members 5 and 6 in order to adjust the tension of each of the first and second chains c1 and c2. An adjuster mechanism 34 of which a part is shown in FIG. 2 is provided. The adjuster mechanism 34 includes a threaded rod 35 joined to the end of the chain c (similar to the first and second), and a chain hooking piece 36 bolted to either the fixing member 4 or the sliding members 5, 6, and 7. , A nut and a lock nut 37 screwed into the screw bar 35, and a coil spring 38 through which the screw bar 35 is inserted.
[0026]
Since the chain hooking piece 36 has an insertion hole 39 as shown in FIG. 2, a screw rod 35 is inserted into the insertion hole 39, and a nut and a lock nut 37 are fastened to the screw rod 35 at an appropriate position. By compressing the coil spring 38, tension is applied to the chain c by the elastic force of the coil spring 38. When such an adjuster mechanism 34 is provided at one end of the chain c, the other end omits the coil spring 38 as shown at the lower side of FIG. 37 is hooked directly.
[0027]
According to the elevating mechanism 2 described above, when the one sliding member 5 is raised by pushing up the operating rod 31 of the cylinder 30 as the drive source 3, the first sprocket s1 is raised together with the one sliding member 5. Along with this, the other end e11 of the first chain c1 raises the other sliding member 6. Further, the second sprocket s2 moves up together with the other sliding members 6. Accordingly, the other end e21 of the second chain c2 raises the core receiving portion 71 together with the sliding member 7.
[0028]
In this state, when the one sliding member 5 is lowered by retreating the operating rod 31 downward, the first sprocket s1 is lowered together with the one sliding member 5. Accordingly, the other end e11 of the first chain hangs down, and the other sliding member 6 connected to the other end e11 of the first chain descends. Further, the second sprocket s2 descends together with the other sliding members 6. Accordingly, the core receiving portion 71 is lowered together with the sliding member 7 connected to the other end e21 of the second chain c2.
[0029]
The present invention can be practiced in various modified, modified, and modified forms based on the knowledge of the trader without departing from the spirit of the present invention. Further, the number of linear motion bearings 10a and 10b is not limited to the four (two sets) exemplified above, but may be increased as appropriate. Further, although the lifting mechanism 2 has a four-stage configuration, the sliding member 7 may be omitted, and the core receiving portion 71 may be provided directly on the sliding member 6 to have a three-stage configuration, or a configuration having five or more stages. good. In addition, the sliding member 5 is described as "one sliding member" and the sliding member 6 is described as "other sliding member". Not intended to be.
[0030]
【The invention's effect】
According to the elevating mechanism of the lift device according to the present invention, the ridge guide portions provided on both sides of the one sliding member and the first guide surfaces provided on both sides of the fixed member, and the ridge guide portion and other moving portions are provided. Since it is slidably engaged with the second guide surfaces provided on both sides of the member via a plurality of linear motion bearings in a vertically slidable manner, friction at such an engagement portion is relatively small. In addition, the sliding operation of the sliding member with respect to the fixed member or the sliding operation of the sliding members can be performed extremely smoothly and with high precision.
[0031]
Moreover, by adopting a configuration in which the linear motion bearing is interposed between the convex guide portion and the first and second guide surfaces, the lifting mechanism can be made thinner, and furthermore, the overall size of the lift device can be reduced. it can.
[0032]
Furthermore, according to the elevating mechanism of the lift device according to the present invention, the cylinder is applied as a driving source, and the individual sliding members are interlocked via the chain and the soup rocket. The core can be lifted to a position higher than the uppermost end of the operating rod.
[0033]
Therefore, the maximum height for lifting the core is not limited by the demand for compactness as in the related art. That is, in addition to being able to set the elevating stroke of the elevating mechanism to be long, it is possible to achieve downsizing of the entire lift device. Such an effect becomes more remarkable when a telescopic cylinder is used as a driving source.
[Brief description of the drawings]
FIG. 1 is a front view of a lifting mechanism of a lift device according to an embodiment of the present invention.
FIG. 2 is a sectional view taken along line AA of FIG.
FIG. 3 is a side view and a schematic view of a lifting mechanism of the lift device according to the embodiment of the present invention.
FIG. 4 is a perspective view and a side view of a core receiving portion applied to a lifting mechanism of a conventional lift device.
[Explanation of symbols]
1: Lifting device 2: Lifting mechanism 3: Driving source 4: Fixed members 5, 6, 7: Sliding member 8: Convex guide portions 80, 81: Inclined surface 90: First guide surface 91: Second guide surface 10a, 10b: linear motion bearing c1: first chain s1: first sprocket

Claims (3)

One of the sliding members is slidably engaged in a vertical direction with a fixed member provided with a driving source, and the other sliding member is slidably engaged in a vertical direction with the one sliding member. An elevating mechanism of a lift device that moves the member and the other sliding member up and down by the drive source, respectively.
A ridge guide portion having a mountain-shaped cross section is provided on both sides of the one sliding member so as to extend vertically, and protrudes from both sides of the one sliding member,
A first guide surface that is provided on both sides of the fixing member so as to extend in a vertical direction, and faces one inclined surface of the ridge guide portion;
A second guide surface that is provided on both sides of the other sliding member so as to extend in the vertical direction, and faces the other inclined surface of the ridge guide portion;
The fixing member, the one sliding member and the other sliding member intervene between the convex guide portion and the first guide surface and between the convex guide portion and the second guide surface, respectively. A plurality of linear motion bearings for guiding the members vertically with respect to each other;
An elevating mechanism for a lift device, comprising: The drive source, a cylinder fixed to the fixed member in an upright posture, an operating rod for moving up and down the one sliding member by moving back and forth from the cylinder, a sprocket supported by the one sliding member, and the fixing member A lifting and lowering mechanism according to claim 1, further comprising a chain having one end connected to the other sliding member and the other end connected to the other sliding member. The lifting mechanism of the lift device according to claim 2, wherein the cylinder is a telescopic cylinder.

Images