JP2009242010A - Meshing chain type lifting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a meshing chain type lifting device for realizing the excellent meshing timing between a pair of lifting driving meshing chains by restraining the occurrence of a phase shift between a pair of lifting sprockets, miniaturization of a driving part, easily attaining phase adjusting work when a shift is caused in a phase between the pair of lifting sprockets, and safely and surely realizing lifting operation of a lifting table. <P>SOLUTION: This meshing chain type lifting device 100 has the lifting sprocket 140, the lifting driving meshing chain 150, the lifting table 110, a driving motor 160 and a synchronous gear group 163, and is provided so that a frictional fastener 180 for fastening the lifting sprocket 140 to a sprocket driving shaft 130 in a friction state, is arranged between a shaft hole inner peripheral surface of the lifting sprocket 140 and an outer peripheral surface of the sprocket driving shaft 130. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is a drive device for moving an object to be lifted and retracted in parallel to an installation surface for use in manufacturing equipment in various manufacturing fields, transport equipment in the transportation field, nursing care equipment in the medical and welfare field, stage equipment in the art field, etc. In particular, the present invention relates to a meshing chain type drive device that employs a meshing chain as a driving medium for advancing and retreating operations.

Conventionally, as a lifting device, there is a pair of meshing chains that mesh with each other and move up and down integrally, that is, a lifting device that lifts and lowers an object to be lifted such as a heavy object using a chuck chain (see, for example, Patent Document 1). ).
As shown in FIG. 8, the meshing chains 550 incorporated in the lifting device 500 are opposed to each other within the same plane around a pair of rotating shafts 530 arranged parallel to the installation surface. Thus, it is driven up and down by a pair of sprockets 540 that rotate forward and backward in opposite directions.
Japanese Patent No. 3370928 (Claims, FIG. 1)

  However, in the conventional lifting device 500, as shown in FIG. 8, the sprocket 540 and the rotary shaft 530 are coupled by fitting the key 531 formed on the rotary shaft 530 into the key groove 541 formed on the sprocket 540. In such key joints, play is likely to occur between the key groove 541 and the key 531 due to manufacturing tolerances, accumulated intersections due to long-term use, and the like, and therefore, between the rotary shaft 530 and the sprocket 540. When the insertion position shift occurs, the phase between the pair of sprockets 540, that is, the phase timing between the sprocket teeth facing each other between the pair of sprockets 540 is shifted, and the phase shift between the pair of sprockets 540 occurs. Due to this, there is a problem that the meshing timing between the pair of meshing chains 550 may deteriorate. As the mesh timing between the pair of mesh chains 550 deteriorates, mesh noise and mesh vibration occur, and such mesh vibration may be transmitted to the object to be lifted. It was.

  In addition, as described above, the meshing timing between the pair of meshing chains 550 is deteriorated, so that the load balance between the chains with respect to the weight of the lifted object or the like is lost, and the durability of the meshing chain is greatly reduced. there were.

  Further, in the conventional lifting device 500, since the shaft strength of the rotary shaft 530 is lowered due to the key processing, the shaft strength required for allowing the shaft torque to be transmitted is ensured. For this reason, it is necessary to design the diameter of the rotating shaft 530 to be larger, and as a result, the sprocket 540 needs to be designed to be larger and the drive portion of the lifting device 500 is increased in size.

  When the phase between the pair of sprockets 540 is shifted after assembling the lifting device 500, the sprocket 540 is removed from the rotating shaft 530 and adjusted to the key 531 of the rotating shaft 530, the key groove 541 of the sprocket 540, or the like. Therefore, there is a problem that an excessive work burden is required for the phase adjustment work between the pair of sprockets 540.

  Therefore, the present invention solves the conventional problem, that is, the object of the present invention is to suppress the occurrence of phase shift between a pair of lifting sprockets and between a pair of lifting drive meshing chains. Realizes good meshing timing, downsizing of the drive part, and easily achieves phase adjustment work even when the phase between the pair of lifting sprockets is shifted, and lifting and lowering operation of the lifting table It is providing the meshing chain type lifting device which implement | achieves safely and reliably.

  A first aspect of the present invention according to claim 1 is a pair of elevating and lowering sprockets that face each other in the same plane and rotate forward and backward in opposite directions around a pair of sprocket drive shafts arranged parallel to the installation surface, The pair of elevating sprockets mesh with each other while being deflected from the horizontal direction to the vertical direction and rise together in a self-supporting state, and the pair of elevating sprockets deviate from each other while being deflected from the vertical direction to the horizontal direction. A pair of elevating drive meshing chains branched, an elevating table installed at the upper end of the elevating driving meshing chain, and elevating and lowering integrally; a drive motor for generating power for driving the pair of elevating sprockets; A meshing chain comprising a synchronous gear group for transmitting power generated by the drive motor to a pair of lifting sprockets via a sprocket drive shaft In the type lifting device, a friction fastener for fastening the lifting sprocket to the sprocket drive shaft in a friction state is provided between the inner peripheral surface of the shaft hole of the lifting sprocket and the outer peripheral surface of the sprocket drive shaft. Thus, the above-mentioned problem is solved.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect, the fastening bolt for adjusting the tightening degree by the friction fastener and the lifting sprocket are arranged in a state of being exposed to the outside of the apparatus. This solves the above-mentioned problems.

  According to a third aspect of the present invention, in addition to the configuration of the first or second aspect, the pair of elevating drive engagement chains are arranged on both sides of the elevating table, respectively, thereby solving the above-described problem. It is a thing.

  According to a fourth aspect of the present invention, in addition to the structure according to any one of the first to third aspects, a lifting / lowering auxiliary guide for guiding a lifting / lowering operation of the lifting / lowering table according to the lifting / lowering driving of the lifting / lowering driving engagement chain. The means is provided so as to be extendable and retractable between the elevating table and the installation surface side, thereby solving the aforementioned problems.

  According to a fifth aspect of the present invention, in addition to the structure according to any one of the first to fourth aspects, the elevating drive engagement chain damps vibration between the elevating sprocket and the elevating table. By being molded from a material, the above-mentioned problems are solved.

  Therefore, the present invention provides a pair of elevating sprockets that are opposed to each other in the same plane and rotate forward and backward in opposite directions around a pair of sprocket drive shafts arranged parallel to the installation surface, and a pair of elevating elevators. A pair of lifts that are engaged with each other while being deflected from the horizontal direction to the vertical direction by the sprocket for lifting and lifted in a self-supporting state, and that are separated from each other while being deflected from the vertical direction to the horizontal direction by the pair of lift sprockets. A driving meshing chain, a lifting table installed at the upper end of the lifting driving meshing chain and moving up and down integrally, a driving motor for generating power for driving a pair of lifting sprockets, and power generated by the driving motor The elevating table moves up and down by providing a group of synchronous gears that transmit to the pair of elevating sprockets via the sprocket drive shaft. Because it can be moved up and down according to the forward and reverse rotation of the lifting sprocket regardless of the position, the lifting table can be moved up and down at the same speed and speed, and the design of the chain storage means and drive part can be increased. Thus, special effects corresponding to the following unique configurations can be achieved.

  According to the meshing chain type lifting device of the present invention according to claim 1, the friction fastener is provided between the inner peripheral surface of the shaft hole of the lifting sprocket and the outer peripheral surface of the sprocket drive shaft. Unlike conventional lifting devices that tend to have a backlash between the keyway and the keyway, the frictional fasteners are used to fasten the lifting sprocket to the sprocket driving shaft in a frictional state. Therefore, the phase between the pair of elevating sprockets, that is, the phase timing of the sprocket teeth facing each other between the pair of elevating sprockets is surely aligned, and the pair of elevating driving meshes. Good meshing timing between the chains can be secured.

  In addition, by ensuring a good meshing timing between the pair of lifting drive meshing chains in this way, meshing noise and meshing vibration that tend to occur when a shift occurs in the meshing timing between the pair of lifting drive meshing chains. Therefore, it is possible to realize a stable lifting operation without giving such meshing vibration to the object to be lifted and improve the load balance between the chains with respect to the weight of the object to be lifted and the like. Durability can be greatly improved.

  Also, the sprocket drive shaft used in the present invention is not subjected to key processing as in a conventional lifting device, and it is possible to avoid a decrease in shaft strength due to key processing, so that when key processing is performed Compared to the sprocket drive shaft with smaller diameter, shaft torque can be allowed to be transmitted, and as the diameter of the sprocket drive shaft is reduced, the lift sprocket can be set smaller, and the mesh chain type lift Miniaturization of the drive part of the apparatus can be realized.

  And even when the phase between the pair of lifting sprockets is shifted after assembly of the mesh chain lifting device, the friction fastener is handled to loosen the fastening state between the sprocket drive shaft and the lifting sprocket. Since the position adjustment work of the lift sprocket with respect to the sprocket drive shaft is easily achieved, the phase adjustment work between the pair of lift sprockets can be easily realized without requiring an excessive work load.

  According to the meshing chain type lifting device of the present invention according to claim 2, in addition to the effect exhibited by the meshing chain type lifting device according to claim 1, a fastening bolt for adjusting the tightening degree by the friction fastener and the lifting sprocket. Are arranged in a state exposed to the outside of the device, so that even if a phase shift occurs between the pair of lifting sprockets after assembly of the meshing chain type lifting device, the fastening bolt is handled from the outside of the device. By loosening the fastening state between the sprocket drive shaft and the lift sprocket, the position of the lift sprocket is visually recognized from outside the device while the lift sprocket is attached to the sprocket drive shaft, and the lift sprocket with respect to the sprocket drive shaft The position adjustment work is more easily achieved, so a pair of work can be done without excessive work load. A phase adjustment between descending sprocket can be more easily realized.

  According to the meshing chain type lifting device of the present invention according to claim 3, in addition to the effect exerted by the meshing chain type lifting device according to claim 1 or 2, the pair of lifting drive meshing chains are provided on both sides of the lifting table. If the object to be lifted is mounted in an unevenly distributed state on the lift table, there is a risk of rolling that tends to occur in the width direction of the lift table near the highest lift position of the lift table. Even in some cases, a pair of lifting drive engagement chains respectively arranged on both sides of the lifting table lifts and lowers in a self-supporting state in which the entire load including the mounted lifting object is reduced. Can be lifted and lowered stably on a horizontal mounting surface.

  According to the meshing chain type lifting device of the present invention according to claim 4, in addition to the effect exhibited by the meshing chain type lifting device according to any one of claims 1 to 3, the lifting drive of the lifting chain meshing chain. The lifting assist guide means for guiding the lifting operation of the lifting table in accordance with the height is provided between the lifting table and the installation surface side so that the lifting assist guide means can be lifted and lowered by the lifting drive engagement chain. Therefore, the elevating operation of the elevating table is guided without difficulty, and the stability of the elevating table elevating can be ensured.

  According to the meshing chain type lifting device of the present invention according to claim 5, in addition to the effect exhibited by the meshing chain type lifting device according to any one of claims 1 to 4, the lifting drive meshing chain is controlled by vibration suppression. Since it is formed from a material, the lifting drive meshing chain damps vibrations between the lifting sprocket and the lifting table, so that the engagement between the pair of lifting drive meshing chains and the lifting sprocket and lifting drive Stable raising / lowering drive can be realized without transmitting vibration generated due to meshing with the meshing chain to the object to be lifted.

  A mesh chain type lifting device according to the present invention includes a pair of lifting sprockets that are opposed to each other in the same plane and rotate forward and backward in opposite directions around a pair of sprocket drive shafts arranged parallel to the installation surface. A pair of lifting sprockets are engaged with each other while being deflected from the horizontal direction to the vertical direction and lifted together in a self-supporting state, and are also separated from each other while being deflected from the vertical direction to the horizontal direction by the pair of lifting sprockets. A pair of lifting drive meshing chains, a lifting table installed at the upper end of the lifting drive meshing chain, and a drive motor for generating power for driving the pair of lifting sprockets, and a drive motor A sprocket drive shaft including a synchronous gear group that transmits generated power to the pair of lifting and lowering sprockets via the sprocket drive shaft. A friction fastener that fastens the elevating sprocket in a frictional state is provided between the inner peripheral surface of the shaft hole of the elevating sprocket and the outer peripheral surface of the sprocket drive shaft, and a phase shift occurs between the pair of elevating sprockets. To achieve good meshing timing between a pair of lifting drive meshing chains, miniaturization of the drive part, and even when a phase shift occurs between the pair of lifting sprockets. Any specific embodiment may be used as long as it provides an engagement chain type lifting device that easily achieves the adjustment work and realizes the lifting and lowering operation of the lifting table safely and reliably. Absent.

  For example, two sets of raising / lowering driving engagement chains respectively arranged on the raising / lowering table in the engagement chain type raising / lowering device of the present invention are so-called chuck chains, and are moved from the horizontal direction to the vertical direction by a pair of raising / lowering sprockets. A specific chain that engages with each other immediately after the deflection drive and lifts up in a self-supporting state and branches off from each other during the deflection drive from the vertical direction to the horizontal direction by a pair of elevating sprockets. The form may be any form, for example, having a roller, not having a roller, that is, having only a bush, one single row in the chain width direction, or in the chain width direction. The chain may be any one of two or more double rows, or a combination thereof. In the case of adopting two or more double rows in the direction, the outer toothing plate and the inner toothing plate constituting one of the pair of raising and lowering driving meshing chains are opposed to the other raising and lowering driving meshing chain. Are generated in the chain width direction of the meshing chain for raising and lowering drive because the outer tooth plate and the inner tooth plate that constitute the upper and lower teeth are engaged in multiple hooks, so-called chucks, in multiple rows in the chain width direction. It is more preferable because it can reliably suppress the buckling that tends to occur and realize excellent chain durability.

  Further, in the above-described lifting drive meshing chain, a bush that is integrally provided with a plate-side press-fitting portion that is press-fitted to the internal tooth plate and a sprocket meshing portion having a larger diameter than the plate-side press-fitting portion may be employed. When a bush is used, the sprocket for lifting and lowering is stably contacted with the specified outer peripheral surface of the sprocket engaging portion formed integrally with the bushing. It is possible to prevent the center of the roller from being unevenly distributed with respect to the center of the connecting pin or the bush when meshing, and the occurrence of meshing vibration and meshing noise between the lifting sprocket and the bushing and the lifting sprocket in this way. By preventing the occurrence of meshing vibration between the chains, it is possible to avoid the occurrence of misalignment in the meshing timing between the chains. Therefore, it is possible to realize a stable raising / lowering operation without giving vibration generated due to such a deviation of the meshing timing to the article to be lifted and efficiently transmit the rotational force of the lifting sprocket to the lifting drive meshing chain. be able to.

  Further, in the lifting drive meshing chain, the pitch between the bushes of the inner tooth plate is the press-fitting fit to the lower side of the preceding inner tooth plate during the lifting drive by the lifting sprocket, and the inner tooth following the inner tooth plate. Set to be equal to the mutual distance from the center of the bush press-fitted to the upper side of the plate, that is, the pitch between the pins of the outer tooth plate is the pitch between the bushes of the inner tooth plate and the inner periphery of the bush and the connecting pin It may be set to be equal to the length obtained by adding the diameter difference from the outer circumference, and when the pin pitch and bush pitch are set in this way, it is caused by the load of the object to be lifted and lowered. Even when the connecting pins are unevenly distributed in the longitudinal direction of the chain in each internal tooth plate with respect to the bush, the mutual spacing of the bushes in the longitudinal direction of the chain becomes equal. Suppressing rattling that tends to occur with the lifting sprocket when the bushes are not evenly spaced, it is possible to achieve a smooth meshing state with the lifting sprocket. By making the mutual intervals of the bushes equal to each other, an external tooth plate and an internal tooth plate constituting one of the pair of lifting drive meshing chains, and an external tooth plate and an internal tooth plate constituting the other lifting drive meshing chain, Since the positional relationship in the longitudinal direction of the chain between them, that is, the height relationship can be appropriately adjusted in a state shifted by a half pitch, smooth meshing timing between the chains can be realized.

  Further, the friction fastener used in the mesh chain type lifting device of the present invention is provided between the inner peripheral surface of the shaft hole of the lifting sprocket and the outer peripheral surface of the sprocket driving shaft and frictions the lifting sprocket against the sprocket driving shaft. Any form may be used as long as it is fastened in a state.

Furthermore, instead of providing the above-described friction fastener between the shaft hole inner peripheral surface of the lifting sprocket and the outer peripheral surface of the sprocket drive shaft, the shaft hole inner peripheral surface of the gear that forms part of the synchronous gear group and the sprocket drive It may be provided between the outer peripheral surface of the shaft, and even in this case, the same effect as that obtained when the friction fastener is provided between the elevating sprocket and the sprocket drive shaft can be exhibited, that is, the sprocket drive shaft By suppressing the displacement of the insertion position between the gear and the gear, the power of the drive motor can be transmitted to the lifting sprocket via the sprocket drive shaft in a state where the rotation timing between the pair of gears is reliably aligned. Therefore, the phase between the pair of lift sprockets, that is, the phase timing of the sprocket teeth facing each other between the pair of lift sprockets is reliably aligned. Thus, it is possible to secure a good meshing timing between the pair of lifting drive meshing chains, and to secure a good meshing timing between the pair of lifting drive meshing chains in this way. Suppression of meshing noise and meshing vibration that tend to occur when meshing timing shifts can be achieved, so that stable lifting operation can be realized without giving such meshing vibration to the object to be lifted and The load balance between the chains with respect to the weight can be improved, and the durability of the meshing chain for raising and lowering drive can be greatly improved.
In addition, since it is possible to avoid a decrease in shaft strength due to the key processing, the sprocket drive shaft with a smaller diameter can be allowed to transmit the shaft torque compared to the case where the key processing is performed. With such a reduction in the diameter of the sprocket drive shaft, the gear can be set smaller, and the drive portion of the meshing chain lifting device can be reduced in size.
Even when the rotational timing between the pair of gears is shifted after the assembly of the mesh chain type lifting device, the sprocket drive shaft is handled by loosening the fastening state between the sprocket drive shaft and the gear by handling the friction fastener. It is possible to easily achieve the position adjustment operation of the gear with respect to the rotational timing between the pair of gears.
Note that the frictional fasteners as described above may be provided both between the elevating sprocket and the sprocket drive shaft and between the gear and the sprocket drive shaft constituting a part of the synchronous gear group.

  Further, the specific mode of the damping material used as the material of the lifting drive meshing chain is caused by the meshing between the pair of lifting drive meshing chains or the meshing of the lifting sprocket and the lifting drive meshing chain. Composite vibration-damping steel that is a composite of steel and a polymer material, or non-composite that imparts damping characteristics to the metal material itself. Any type of damping steel material of a mold (alloy mold) may be used.

  Furthermore, in the meshing chain type lifting device of the present invention, the lifting table that lifts and lowers the object to be lifted is lifted and lowered by the driving force of the lifting drive meshing chain. In order to guide the stable lifting operation of this lifting table It is desirable to interpose a lift assist guide means between the lift table and the installation floor surface side. The specific form of the lift assist guide means is an X-shaped punter arm used for a scissor lifter or the like. It may be a telescopic pipe used for a guide post lifter or the like.

And the meshing chain type lifting device of the present invention has no hindrance to the lifting operation even if the installation surface is a floor surface in a stationary installation form, or a ceiling surface in a suspended installation form, Even if the vertical wall surface is in a cantilevered form, there is no hindrance to the advancing / retreating operation corresponding to the above-described lifting operation.
In addition, when adopting the above-described suspended installation form and cantilever support form, the lifting table used in the case of adopting the stationary installation form is not an indispensable component, and the object to be lifted / lowered using other means is used. What is necessary is just to attach directly or indirectly to the edge part of the meshing chain for raising / lowering drive.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A meshing chain lifting apparatus 100 that is an embodiment of the present invention will be described below with reference to the drawings.
Here, FIG. 1 is an overall perspective view of a meshing chain type lifting device which is an embodiment of the present invention, and FIG. 2 is a perspective view of the state in which the lifting table and the panta arm are removed from FIG. 3 is a partially enlarged view of the vicinity of the lifting sprocket shown in FIG. 2, FIG. 4 is a perspective view showing an exploded assembly state and a disengaged state of the lifting drive engagement chain, and FIG. 5 is a friction fastener. FIG. 6 is a cross-sectional view showing the friction fastener, and FIG. 7 is a plan view showing a meshed state of the lifting drive meshing chain and the lifting sprocket.

  First, as shown in FIG. 1, the meshing chain type lifting device 100 according to the first embodiment of the present invention lifts and lowers a lifting table 110 carrying a heavy object (not shown) parallel to the installation floor surface. It is to be installed.

  As shown in FIGS. 1 to 3, the meshing chain lifting device 100 according to the present embodiment includes a base plate 120 installed on the installation floor surface on which the above-described lifting table 110 moves up and down in parallel, and the base plate 120. A pair of elevating sprockets 140 that are opposed to each other in the same plane and rotate forward and backward in the opposite direction around a pair of sprocket drive shafts 130 that are juxtaposed in parallel with each other, and that the pair of elevating sprockets 140 are engaged with each other. The pair of lifting drive mesh chains 150 that lift and lower the lifting table 110 by rotating, the lifting table 110 that is installed at the upper end of the lifting drive mesh chain 150 and moves up and down integrally, and the pair of lifting sprockets 140 are rotated. A power transmission chain 162 for transmitting power to the synchronous gear group 163 to be driven, and this power transmission A basic motor configuration includes a drive motor 160 that drives the chain 162 and a chain guide plate 170 that is provided in a crotch region where the pair of lift sprockets 140 face each other and guides and moves the pair of lift drive engagement chains 150. ing.

In addition, the side surface of the raising / lowering sprocket 140 mentioned above is arrange | positioned in the state exposed to the exterior of an apparatus, as shown in FIG. 1 thru | or FIG.
Further, regarding the specific installation mode of the lifting table 110 with respect to the lifting drive engagement chain 150 described above, the lifting table 110 is fixed to the upper end of the lifting drive engagement chain 150, and the lifting drive engagement chain 150 is lifted up and down to the upper end of the lifting drive engagement chain 150. It may be anything such as a table on which the table 110 is mounted, or a table in which the lifting table 110 is arranged with a gap provided at the upper end of the lifting drive engagement chain 150.

The pair of lifting drive engagement chains 150 described above are arranged in two sets on the left and right with respect to the lifting table 110 and are in a so-called two-protruding state.
Thereby, when the object to be lifted is mounted in a state of being unevenly distributed on the lifting table 110 or when there is a risk of rolling that tends to occur in the width direction of the lifting table 110 in the vicinity of the highest lift position of the lifting table 110. Even if there is, a pair of lifting drive engagement chains 150 arranged on both the left and right sides of the lifting table 110 divide the entire load including the mounted lifted object into two parts, and lift and lower in a self-supporting state in which the load is reduced. It is supposed to be.
Moreover, even if one of the two pairs of lifting drive mesh chains 150 arranged in a pair is cut, the other pair of lifting drive mesh chains 150 supports the lifting table 110 so as not to fall. .

The power transmission chain 162 is composed of two sets of roller chains for transmitting power from the driving side sprocket 161 to the driven side sprocket of the synchronous gear group 163, and is in a so-called double hooked state. Yes.
Thereby, the power transmitted from the drive side sprocket 161 to the driven side sprocket is divided into two to reduce the transmission load.
Moreover, even if one of the two sets of power transmission chains 162 is cut, the other power transmission chain 162 transmits power so that the lifting table 110 does not fall.

Further, the above-described drive motor 160 includes a known worm and worm gear (not shown).
The reduction mechanism comprised by is provided. Thereby, even if a drive failure occurs, a mutual meshing resistance between the worm and the worm gear, that is, a so-called self-locking function works.

  1 and 2 are a pair of drive-side sprockets 161 coaxially arranged on the output shaft side of the drive motor 160 provided with a speed reduction mechanism, and the reference numeral 163 shown in FIG. 3 is a pair of power transmissions. This is a synchronous gear group for transmitting power from the chain 162 to the pair of elevating sprockets 140 so as to rotate forward and backward in opposite directions.

  In the meshing chain lifting device 100 of the present embodiment, as shown in FIG. 3, the chain guide plate 170 that guides and moves the pair of lifting drive meshing chains 150 includes a crotch region where the pair of lifting sprockets 140 face each other. So that the pair of lifting drive engagement chains 150 are engaged with each other and lifted together in a self-supporting state, and the pair of lift drive engagement chains 150 are disengaged from each other and branched. It has become.

  Further, as shown in FIG. 1 and the like, the drive motor 160 provided with the speed reduction mechanism as described above is spaced apart from the peripheral area of the lowest position of the lift table 110, that is, outside the area under the projection umbrella of the lift table 110. ing.

Further, as shown in FIG. 1, the above-described chain storage means 190 is also spaced apart from the area around the lowest position of the lifting table 110, that is, outside the area under the projection umbrella of the lifting table 110, as with the drive motor 160. ing.
That is, one of the pair of lifting drive meshing chains 150 that are separated from each other and branched is housed in a chain housing means 190 including a take-up type chain housing box 191 disposed on the drive motor 160 side. The other of the lifting drive meshing chains 150 is configured to be housed in a chain housing means 190 including a linear storage rail 192 disposed on the opposite side facing the drive motor 160.

  Therefore, it is possible to lower the lowest position of the lifting table 110, that is, to lower the floor of the lifting table 110, without considering the height of the drive motor 160 and the meshing chain storage means 190. The work load for carrying the object to and from the lifting table 110 is greatly reduced, and the drive motor 160 and the meshing chain storage means 190 are safe and simple during maintenance of the lifting mechanism. Maintenance work can be performed.

Further, as shown in FIG. 1, an up-and-down auxiliary guide having an upper and lower two-stage connection comprising an inner arm 194 and an outer arm 195 called an X-shaped panter arm between the lifting table 110 and the base plate 120 on the installation floor surface side. By interposing the means 193, it is configured to guide a stable lifting operation of the lifting table 110.
Reference numeral 196 shown in FIG. 1 and the like is a slide rail for sliding the lower end of the inner arm 194 in accordance with the raising / lowering operation.

  Further, the pair of raising / lowering engagement chains 150 used in the engagement chain type lifting apparatus 100 according to the first embodiment of the present invention is a so-called chuck chain. As shown in FIG. Of the inner tooth plate 151, a hook-shaped outer tooth plate 152 that overlaps the inner tooth plate 151 by a half pitch in the chain longitudinal direction, and a bushing 153 that connects and fixes the inner tooth plates 151 in the chain width direction. And a roller 154 fitted on the bush 153 and a connecting pin 155 for connecting and fixing the external tooth plates 152 in the chain width direction, and vertically extending from the horizontal direction along the chain guide plate 170 described above. A pair of elevating sprockets 14 that are engaged with each other while being deflected in the direction and ascend in a self-supporting state. It is arranged to branch off bite each other while deflecting from the vertical to the horizontal direction by.

  The internal tooth plate 151 and the external tooth plate 152 constituting one of the pair of lifting drive meshing chains 150 are opposed to the internal tooth plate 151 and the external tooth plate constituting the other lifting drive meshing chain 150 facing each other. 152 and a plurality of hooks, so-called chucks, are engaged with each other in multiple rows in the chain width direction, and are firmly engaged with each other while supporting the entire load including the mounted object to be lifted and lowered. Even when an eccentric load is applied to one side in the chain width direction of the lifting / lowering interlocking chain 150 that moves up and down in a self-supporting state, buckling tends to occur in the chain width direction of the lifting / lowering interlocking chain 150 in an overloaded state. Suppressing it reliably to ensure excellent chain durability and avoiding accidental chain cutting.

Therefore, the friction fastener 180 and the lifting drive engagement chain 150, which are the most characteristic features of the engagement chain type lifting apparatus 100 of this embodiment, will be described in detail with reference to FIGS.
First, as shown in FIGS. 5 to 7, the friction fastener 180 is provided between the inner peripheral surface of the shaft hole of the lifting sprocket 140 and the outer peripheral surface of the sprocket drive shaft 130. On the other hand, the elevating sprocket 140 is fastened in a friction state.

  As shown in FIG. 6, the friction fastener 180 is in contact with the outer ring 181 disposed in contact with the inner peripheral surface of the shaft hole of the lifting sprocket 140 and the outer peripheral surface of the sprocket drive shaft 130. And an inner ring 182 arranged at the end of the inner ring 182 and a tapered surface formed at an axial end of the inner ring 182 and expanding toward the front in the screwing direction of a fastening bolt 185 described later, and the sprocket drive shaft 130. Wedge member 183, flange member 184 engaged with the axial edge of the inner peripheral surface of the shaft hole of lifting sprocket 140, and between the outer ring 181 and inner ring 182 described above, and between wedge member 183 and flange member 184. And a fastening bolt 185 to be inserted between them.

  As shown in FIG. 6, the wedge member 183 described above has a tapered surface on the outer periphery that is reduced in diameter toward the front in the screwing direction of the fastening bolt 185, and the fastening bolt 185 is exposed to the outside of the apparatus. And a flange portion that engages with the wedge member 183 and the flange member 184 is provided behind the fastening bolt 185 in the screwing direction.

When the elevating sprocket 140 is fastened to the sprocket drive shaft 130 using the friction fastener 180, the fastening bolt 185 is screwed in the axial direction (left direction in FIG. 6), so that the fastening bolt 185 The wedge member 183 is pushed in the axial direction through the flange portion, and the wedge member 183 pushed in the axial direction in this way has a wedge effect in which a force in the axial direction is converted into a force in the radial direction by using a tapered surface. It comes to show.
The wedge effect of the wedge member 183 pushes the lifting sprocket 140 radially outward on the outer peripheral surface of the outer ring 181, and the inner peripheral surface of the wedge member and the inner peripheral surface of the inner ring 182 are pressed. Thus, the sprocket drive shaft 130 is pressed radially inward to fasten the elevating sprocket 140 to the sprocket drive shaft 130 in a frictional state.

  The friction fastener 180 described above is provided between the inner peripheral surface of the shaft hole of the elevating sprocket 140 and the outer peripheral surface of the sprocket drive shaft 130 and fastens the elevating sprocket 140 to the sprocket drive shaft 130 in a frictional state. Any configuration may be used as long as the configuration is not limited to the above-described configuration.

Further, the friction fastener 180 in this embodiment is provided between the inner peripheral surface of the shaft hole of the elevating sprocket 140 and the outer peripheral surface of the sprocket drive shaft 130, and constitutes a part of the synchronous gear group 163. It may be provided between the inner peripheral surface of the shaft hole of the gear 163a and the outer peripheral surface of the sprocket drive shaft 130. Even in this case, the friction fastener 180 is provided between the elevating sprocket 140 and the sprocket drive shaft 130. In other words, the rotation timing between the pair of gears 163a is reliably aligned by suppressing the occurrence of the insertion position shift between the sprocket drive shaft 130 and the gear 163a. Thus, the power of the drive motor 160 can be transmitted to the elevating sprocket 140 via the sprocket drive shaft 130, so that the pair of elevating sprockets 1 The phase between 0, that is, the phase timing of the sprocket teeth facing each other between the pair of lifting sprockets 140 can be reliably aligned to ensure good meshing timing between the pair of lifting drive meshing chains 150. Thus, by ensuring a good meshing timing between the pair of lifting drive meshing chains 150, it is possible to generate meshing noise and meshing vibration that are likely to occur when the meshing timing between the pair of lifting drive meshing chains 150 is shifted. Therefore, it is possible to realize a stable raising / lowering operation without giving such meshing vibration to the object to be lifted and to improve the load balance between the chains with respect to the weight of the object to be lifted etc. Durability can be greatly improved.
In addition, since it is possible to avoid a decrease in shaft strength due to the key processing, the sprocket drive shaft 130 having a smaller diameter than the case where the key processing is performed can allow the shaft torque to be transmitted, As the diameter of the sprocket drive shaft 130 is reduced, the gear 163a can be set smaller, and the drive portion of the meshing chain lifting device 100 can be reduced in size.
Even when the rotational timing between the pair of gears 163a is shifted after the mesh chain type lifting device 100 is assembled, the friction fastener 180 is handled to loosen the fastening state between the sprocket drive shaft 130 and the gear 163a. Thus, the position adjustment operation of the gear 163a with respect to the sprocket drive shaft 130 can be easily achieved, and the rotation timing between the pair of gears 163a can be matched.

  Note that the friction fastener 180 may be provided both between the elevating sprocket 140 and the sprocket drive shaft 130 and between the gear 163a constituting the part of the synchronous gear group 163 and the sprocket drive shaft 130. .

  The raising / lowering engagement chain 150 is formed from a damping material such as a damping steel material in which a polymer material is combined with a steel material. Vibration generated due to meshing with the lifting drive meshing chain 150 is damped between the lifting sprocket 140 and the lifting table.

Next, the raising / lowering operation | movement of the meshing chain type raising / lowering apparatus 100 which is 1st Example of this invention is demonstrated based on FIG.
First, as shown in FIG. 1, when the lifting table 110 reaches the highest position, a pair of lifting drive engagement chains 150 are formed of a chain storage box 191 and a linear storage rail 192 by a pair of lifting sprockets 140. A drive motor provided with a speed reduction mechanism while being supported from the storage means 190 and supporting the entire weight of the lift table 110 on which the pair of lift drive engagement chains 150 is mounted with a lifted object (not shown) made of heavy objects. In accordance with the output of 160, the power transmission chain 162 hung by two is raised at a constant speed and quickly.
At this time, the vertical auxiliary guide means 193 composed of the inner arm 194 called the X-shaped panter arm and the outer arm 195, which is connected in the upper and lower stages, guides the stable upward movement of the vertical table 110. It has become.

On the other hand, when the lifting table 110 reaches the lowest position, the pair of lifting drive mesh chains 150 are branched to the chain storage means 190 including the chain storage box 191 and the linear storage rail 192 by the pair of lifting sprockets 140, respectively. While being pulled in, two pairs of lifting drive engagement chains 150 are hung according to the output of the drive motor 160 having a speed reduction mechanism while supporting the entire weight of the lifting table 110 on which a heavy object (not shown) is mounted. The power transmission chain 162 descends at a constant speed and quickly.
At this time, the upper / lower auxiliary guide means 193 composed of the above-mentioned X-shaped inner arm 194 and outer arm 195, which is connected in the upper and lower stages, guides the stable lowering operation of the lifting table 110 while being folded. ing.

In the meshing chain type lifting device 100 of this embodiment obtained in this way, the friction fastener 180 is provided between the inner peripheral surface of the shaft hole of the lifting sprocket 140 and the outer peripheral surface of the sprocket drive shaft 130. .
Therefore, unlike the conventional lifting device 500 that tends to generate a play between the key 531 and the key groove 541, the lifting sprocket 140 is fastened to the sprocket drive shaft 130 in a frictional state using the friction fastener 180. Since the occurrence of a displacement of the insertion position between the sprocket drive shaft 130 and the lift sprocket 140 is suppressed, the phase between the pair of lift sprockets 140, that is, the sprocket teeth facing each other between the pair of lift sprockets 140 It is possible to ensure good meshing timing between the pair of lifting drive meshing chains 150 by reliably matching the phase timing.

  Further, by ensuring a good meshing timing between the pair of lifting drive meshing chains 150 in this way, the meshing noise that tends to occur when a shift occurs in the meshing timing between the pair of lifting drive meshing chains 150 and the like. Since the meshing vibration is suppressed, stable lifting operation can be realized without applying such meshing vibration to the object to be lifted, and the load balance between the chains with respect to the weight of the object to be lifted is improved, and the lifting drive meshing The durability of the chain 150 can be greatly improved.

  Further, the sprocket drive shaft 130 used in the present invention is not subjected to key processing as in the conventional lifting device 500, and the key strength can be avoided because a reduction in shaft strength due to the key processing can be avoided. The sprocket drive shaft 130 having a smaller diameter compared to the case can be transmitted while allowing the shaft torque to be allowed, and as the diameter of the sprocket drive shaft 130 is reduced, the elevating sprocket 140 can also be set smaller. Therefore, it is possible to reduce the size of the drive portion of the meshing chain type lifting device 100.

  The fastening bolt 185 for adjusting the tightening degree by the friction fastener 180 and the lifting sprocket 140 are arranged in a state of being exposed to the outside of the device, so that a pair of lifting and lowering devices are assembled after the meshing chain lifting device 100 is assembled. Even when a phase shift occurs between the sprockets 140, the fastening bolts 185 are handled from the outside of the apparatus to loosen the fastening state between the sprocket drive shaft 130 and the lifting sprocket 140, so that the lifting sprocket 140 is removed from the sprocket 140. Since the position of the elevating sprocket 140 is visually recognized from the outside of the apparatus while attached to the drive shaft 130 and the position adjustment operation of the elevating sprocket 140 with respect to the sprocket drive shaft 130 is easily achieved, an excessive work load is not required. Between a pair of lifting sprockets 140 That the phase adjusting operation can be easily realized.

In addition, a pair of lifting drive engagement chains 150 are disposed on both sides of the lifting table 110, respectively.
Therefore, there are cases where the object to be lifted is mounted in a state of being unevenly distributed on the lifting table 110, or when there is a risk of rolling that tends to occur in the width direction of the lifting table 110 near the highest position of the lifting table 110. However, since the pair of lifting drive mesh chains 150 arranged on both sides of the lifting table 110 are lifted and lowered in a self-supporting state in which the entire load including the mounted lifting object is reduced, the lifting object is leveled. Can be moved up and down stably on a simple mounting surface.

Further, a lifting assist guide means 193 that guides the lifting operation of the lifting table 110 in accordance with the lifting drive of the lifting drive engagement chain 150 is provided between the lifting table 110 and the installation surface so as to be extendable.
Therefore, since the raising / lowering auxiliary guide means 193 follows the raising / lowering drive of the raising / lowering driving engagement chain 150 and guides the raising / lowering operation of the raising / lowering table 110 without difficulty, the stability of the raising / lowering table 110 to be raised / lowered can be ensured.

The raising / lowering driving engagement chain 150 is formed of a damping material.
Accordingly, since this lifting / lowering driving engagement chain 150 attenuates vibration between the lifting / lowering sprocket 140 and the lifting / lowering table, the engagement between the pair of lifting / lowering driving engagement chains 150 and the lifting / lowering driving sprocket 140 and the lifting / lowering engagement mesh chain 150. The effect is enormous, for example, stable lifting drive can be realized without transmitting vibration generated due to meshing to the object to be lifted.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall perspective view of a meshing chain lifting device that is an embodiment of the present invention. The perspective view of the state which removed the raising / lowering table and the panta arm from FIG. FIG. 3 is a partially enlarged view of the vicinity of a lifting drive sprocket shown in FIG. 2. The perspective view which shows the disassembled assembly state of the raising / lowering drive meshing chain, and the disengagement state. Explanatory drawing which shows the attachment aspect of a friction fastener. Sectional drawing which shows a friction fastener. The top view which shows the meshing state of the meshing chain for raising / lowering drive and the sprocket for raising / lowering. The top view which shows the conventional meshing chain type raising / lowering apparatus.

Explanation of symbols

100, 500 ... meshing chain type lifting device 110 ... lifting table 120 ... base plate 130, 530 ... sprocket drive shaft 140, 540 ... lifting sprocket 150, 550 ... lifting drive meshing Chain 151 ... Hook-like inner tooth plate 152 ... Hook-like outer tooth plate 153 ... Bush 154 ... Roller 155 ... Connecting pin 160 ... Drive motor 161 ... Drive-side sprocket 162 ... Power transmission chain 163 ... Synchronous gear group 170, 570 ... Chain guide plate 180 ... Friction fastener 185 ... Fastening bolt 190 ... Chain storage means 191 ... Winding Chain storage box 192 ・ ・ ・ Linear storage rail 1 3 ... lift assist guide means 194 ... inner arm 195 ... outer arm 196 ... slide rail

Claims (5)

A pair of lifting sprockets that face each other in the same plane and rotate forward and backward in the opposite direction around a pair of sprocket drive shafts juxtaposed parallel to the installation surface, and a horizontal direction by the pair of lifting sprockets A pair of lifting drive meshing chains that are engaged with each other while being vertically deflected from each other and are lifted in a self-supporting state, and are separated from each other while being deflected from the vertical direction to the horizontal direction by the pair of lifting sprockets. A lifting table that is installed at the upper end of the lifting drive meshing chain and moves up and down integrally, a drive motor that generates power for driving the pair of lifting sprockets, and power generated by the drive motor is sprocketed In a mesh chain type lifting device provided with a synchronous gear group that transmits to a pair of lifting sprockets via a drive shaft,
Friction fasteners for fastening a lifting sprocket to the sprocket drive shaft in a friction state are provided between the inner peripheral surface of the shaft hole of the lifting sprocket and the outer peripheral surface of the sprocket drive shaft. Chain type lifting device.   The engagement chain type lifting device according to claim 1, wherein the fastening bolt for adjusting the tightening degree by the friction fastener and the lifting sprocket are arranged in a state exposed to the outside of the device.   The engagement chain type lifting device according to claim 1 or 2, wherein the pair of lifting drive engagement chains are arranged on both sides of the lifting table.   A lifting assist guide means for guiding a lifting operation of the lifting table in accordance with the lifting drive of the lifting drive meshing chain is provided between the lifting table and the installation surface side so as to be extendable and retractable. The meshing chain type lifting device according to any one of claims 1 to 3.   The mesh according to any one of claims 1 to 4, wherein the lifting drive meshing chain is formed of a damping material that attenuates vibration between the lifting sprocket and the lifting table. Chain type lifting device.

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