JP2010001129A - Meshing chain type lifting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a meshing chain type lifting device improving positioning accuracy of a lifting table in a vertical direction and keeping a loading surface of the lifting table in a horizontal condition while detecting information about a lifting position and inclination of the lifting table with high accuracy. <P>SOLUTION: The meshing chain type lifting device 100 comprises the lifting table 110, a lifting sprocket 140, a meshing chain 150 for lifting drive, a drive source 160 and a pantograph mechanism 170, wherein a straddle angle detection sensor 180 is installed in the pantograph mechanism 170. <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 driving device that employs a meshing chain as a drive medium for advancing and retreating operations.

2. Description of the Related Art Conventionally, as a lifting device, there is a lifting device that lifts and lowers an object to be lifted such as a heavy object using a pair of meshing chains that mesh with each other by a sprocket and move up and down integrally (for example, see Patent Document 1).
And the load support member which mounts a to-be-lifted object on the upper surface is connected with the upper end of a pair of meshing chain.
Japanese Patent No. 3370928

  However, in the conventional lifting device, the meshing chain that supports the load supporting member is compressed in the longitudinal direction of the chain due to the weight of the load supporting member including the object to be lifted. Since the load varies depending on the weight of the object, the height of the loading surface of the load support member is not constant when the object is loaded and unloaded, and smooth transfer of the object to be lifted between the load support member and peripheral devices is hindered. In order to improve the positioning accuracy of the load supporting member in the vertical direction, further contrivance has been required.

  In addition, when the object to be lifted is unevenly distributed on the load surface of the load support member, the load surface of the load support member is inclined with respect to the horizontal plane due to the weight of the object to be lifted, Since the load support member may be displaced from the load surface, it is necessary to further devise in order to keep the load surface of the load support member in a horizontal state.

  Therefore, the present invention is to solve the conventional problem, that is, the object of the present invention is to improve the positioning accuracy of the lifting table in the vertical direction and hold the loading surface of the lifting table in a horizontal state, And it is providing the meshing chain type raising / lowering apparatus which detects the information regarding the raising / lowering position and inclination of a raising / lowering table with high precision.

  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 rotating 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 are lifted in a self-standing 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 an upper end of the lifting driving meshing chain, and a drive source for driving the pair of lifting sprockets, the lifting table and the installation surface And a pantograph mechanism provided with a pantograph mechanism that is provided in a freely extending manner and guides the lifting operation of the lifting table. Open leg angle detecting sensor for detecting the open leg angle between interlinked to stretch constitute a mechanism, by which is installed in the pantograph mechanism, which solves the problems described above.

  According to a second aspect of the present invention, in addition to the configuration according to the first aspect, the above-described problems are solved by arranging the open leg angle detection sensors in the table width direction of the lifting table. .

  According to a third aspect of the present invention, in addition to the configuration of the first or second aspect, the open leg angle detection sensor is disposed in the longitudinal direction of the lifting table, thereby solving the above-described problem. It is a thing.

  Accordingly, the meshing chain type lifting device of the present invention is 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 rotating shafts arranged parallel to the installation surface. And a pair of lifting sprockets that 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 displaced 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, lifting and lowering integrally, a drive source for driving a pair of lifting sprockets, and the lifting table and the installation surface It is provided with a pantograph mechanism that can be freely extended and retracted to guide the lifting operation of the lifting table, so that the lifting table is related to the lifting position. As the elevating table can be moved up and down in accordance with the forward and reverse rotation of the elevating sprocket, the elevating operation of the elevating table can be achieved at a constant speed and quickly, and a high degree of freedom in designing the chain storage means and the drive part can be realized. The special effect corresponding to the peculiar composition like this can be produced.

  According to the meshing chain type lifting apparatus of the present invention according to claim 1, since the leg angle detection sensor is installed in the pantograph mechanism, the leg angle between the links measured by the leg angle detection sensor is determined. Since the pantograph mechanism can detect the expansion and contraction state, it is possible to improve the positioning accuracy of the lifting table in the vertical direction by controlling the lifting position of the lifting table based on this detection information. If the lifting / lowering position of the lifting / lowering table changes due to the change in the weight of the lifting / lowering engagement mesh chain in the longitudinal direction of the chain due to the weight change of the lifting / lowering table that tends to occur during loading / unloading, A change in the lift position of the lift table is detected by the open leg angle detection sensor, and the lift position of the lift table can be corrected based on this detection information. Because, it is possible to realize smooth out loading of the lifting thereof against the lifting table by keeping the height of the loading surface of the lifting table constant.

  Further, when the leg angle detection sensors are arranged at a plurality of locations, the inclination of the lifting table with respect to the horizontal plane can be detected by measuring and comparing the leg angles between the links at each location. Based on this, the pantograph mechanism can be controlled to keep the stacking surface of the lifting table in a horizontal state, thereby achieving a stable lifting operation.

  Compared to the case where a rotary encoder is installed on an elevating drive meshing chain that tends to be compressed in the longitudinal direction of the chain due to the weight of the elevating table including the object to be raised and lowered, and an elevating sprocket that raises and lowers the elevating drive meshing chain. Since the meshing chain type lifting device of the present invention can detect the expansion and contraction state of the pantograph mechanism directly attached to the bottom surface side of the lifting table, it can detect the lifting position and tilt information of the lifting table with high accuracy. Highly accurate control of the lifting table can be realized.

  According to the meshing chain type lifting device of the present invention according to claim 2, in addition to the effect produced by the meshing chain type lifting device according to claim 1, the leg angle detection sensors are arranged in the table width direction of the lifting table. By detecting and comparing the expansion and contraction states of the pantograph mechanism on both sides of the lifting table in the table width direction, the tilting of the lifting table in the table width direction can be detected. Based on this detection information, the pantograph By controlling the mechanism, it is possible to prevent the object to be lifted and the like from dropping in the table width direction from the loading surface of the lifting table.

  According to the meshing chain type lifting device of the present invention according to claim 3, in addition to the effect produced by the meshing chain type lifting device according to claim 1, the leg angle detection sensors are respectively arranged in the table longitudinal direction of the lifting table. Therefore, it is possible to detect the inclination of the lift table in the longitudinal direction of the table by detecting and comparing the expansion and contraction states of the pantograph mechanism on both sides of the lift table in the longitudinal direction of the table. The mechanism can be controlled to provide a stable loading surface for the lifting table.

  A meshing chain lifting device of the present invention includes a pair of lifting sprockets that face each other in the same plane and rotate forward and backward in opposite directions around a pair of rotating shafts arranged parallel to the installation surface, A pair of lifting sprockets mesh with each other while deflecting from the horizontal direction to the vertical direction and rise together in a self-standing state, and a pair of lifting sprockets deviate from each other while deflecting from the vertical direction to the horizontal direction and branch off. A pair of lifting drive meshing chains, a lifting table installed at the upper end of the lifting drive meshing chain, lifting and lowering integrally, a drive source for driving a pair of lifting sprockets, and an expansion and contraction between the lifting table and the installation surface A pantograph mechanism that is freely provided and guides the lifting operation of the lifting table. A leg angle detection sensor for detecting the angle is installed in the pantograph mechanism to improve the positioning accuracy of the lifting table in the vertical direction and keep the stacking surface of the lifting table in a horizontal state. As long as the information can be detected with high accuracy, the specific embodiment may be anything.

  For example, two sets of lifting drive engagement chains respectively arranged on the lifting table in the engagement chain type lifting device of the present invention are integrally engaged with each other immediately after being driven by a pair of lifting sprockets from the horizontal direction to the vertical direction. As long as it is lifted in a self-supporting state and is branched by a pair of elevating sprockets from the vertical direction to the horizontal direction when they are deviated from each other and branched, the specific chain form may be any, for example, , Having a roller, not having a roller, that is, having only a bush, having one single row in the chain width direction, having two or more rows in the chain width direction, or Any combination of these may be used, but when two or more double rows are used in the chain width direction The outer tooth plate and the inner tooth plate constituting one of the pair of lifting drive meshing chains have a chain width with respect to the outer toothing plate and the inner tooth plate constituting the other lifting drive meshing chain opposite thereto. Since multiple hooks are engaged with each other in multiple directions in the direction of the double row, it is possible to reliably suppress buckling that tends to occur in the chain width direction of the lifting drive engagement chain, thereby realizing excellent chain durability. More preferred.

  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 bushing is used, the sprocket for lifting and lowering is stably contacted with the specified outer peripheral surface of the sprocket meshing part 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. To prevent the occurrence of meshing vibration between the chain and the occurrence of misalignment in the meshing timing between the chains. Thus, it is possible to realize a stable raising / lowering operation without giving vibration generated due to such a shift in the meshing timing to the object 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 between the centers of the bushes press-fitted on the upper side of the plate, that is, the pitch between the pins of the external tooth plate is the pitch between the bushes of the internal 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 inward in the longitudinal direction of the chain in each internal tooth plate with respect to the bush, the mutual spacing of the respective 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.

  The leg opening angle detection sensor used in the meshing chain type lifting device of the present invention is a rotary potentiometer, resolver, and rotary encoder as long as it detects the leg angle between links that constitute a pantograph mechanism and extend and contract. Any aspect may be exhibited.

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 elevating operation.
In addition, when adopting the hanging installation form and the cantilever support form as described above, the lifting table used in the case of adopting the stationary installation form is not an essential component, and is lifted using other means. What is necessary is just to attach an object 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 a first embodiment of the present invention will be described below with reference to the drawings.
Here, FIG. 1 is an overall perspective view of the meshing chain type lifting device which is the first embodiment of the present invention, and FIG. 2 is a perspective view of the state where the lifting table and the pantograph mechanism 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 meshing chain, and FIG. 5 is a pantograph mechanism. And FIG. 6 is an explanatory view showing a control means used in the drive motor.

  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 on which a heavy object (not shown) is mounted in parallel to the installation surface. It is intended for installation.

  As shown in FIGS. 1 to 4, the meshing chain type lifting device 100 of the present embodiment is parallel to the base plate 120 installed on the installation surface on which the lifting table 110 is lifted and lowered in parallel. A pair of lifting 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 rotating shafts 130 arranged in parallel, and lift and lower by engaging with the pair of lifting sprockets 140. A pair of elevating drive mesh chains 150 that elevate the table 110, the elevating table 110 that is installed at the upper end of the elevating drive mesh chain 150 and that moves up and down integrally, and a synchronous gear that rotates the pair of elevating sprockets 140. A power transmission chain 162 that transmits power to the group 163 and the power transmission chain 162 A drive motor 160 as a drive source for driving, a chain guide plate 165 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 mesh chains 150, the lift table 110, and the installation surface The pantograph mechanism 170 is provided as a basic device configuration that is provided between the two and the other so as to be extendable and retractable and guides the lifting operation of the lifting table 110.

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.

Furthermore, the drive motor 160 as the drive source described above includes a speed reduction mechanism that includes a known worm and a worm gear (not shown).
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.

In the present embodiment, the drive motor 160 is used as a drive source for driving the elevating sprocket 140, but other drive means, for example, a handle is used to manually generate the drive force. It doesn't matter.
2 and 3 are a pair of drive-side sprockets 161 coaxially arranged on the output shaft side of the drive motor 160 having 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 this embodiment, as shown in FIG. 4, the chain guide plate 165 that guides and moves the pair of lifting drive meshing chains 150 includes a crotch region where the pair of lifting sprockets 140 are opposed to 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 FIGS. 2 and 3, the drive motor 160 having the speed reduction mechanism as described above is separated from the peripheral area of the lowest position of the lifting table 110, that is, outside the area under the projection umbrella of the lifting table 110. Has been placed.

Further, as shown in FIG. 2, the above-described chain storage means 190 is also spaced apart from the peripheral area of 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, the lowering position of the lifting table 110 can be lowered without considering the height dimension of the drive motor 160 and the chain storage means 190, that is, the floor of the lifting table 110 can be lowered. The work burden of carrying the object to and from the lifting table 110 is greatly reduced, and the maintenance work of the lifting mechanism is safe and simple maintenance work without causing the drive motor 160 and the chain storage means 190 to become a work obstacle factor. Can be done.

Further, as shown in FIGS. 1 and 5, the pantograph mechanism 170 described above includes a pantograph member 171 in which an inner arm 172 as a link and an outer arm 173 intersect with each other so as to be rotatable around an intersection 174. Are connected to each other in the expansion and contraction direction in the upper and lower stages through the joint portion 175.
Two sets of the pantograph mechanisms 170 are arranged in the horizontal direction in the front and rear two-row format with respect to the lifting table 110.

As shown in FIGS. 1 and 5, the pantograph mechanism 170 is designed to expand and contract following the raising / lowering drive of the raising / lowering engagement chain 150, and is designed to guide the stable raising / lowering operation of the lifting table 110. Has been.
In addition, the code | symbol 176 shown in FIG. 5 is a connection rib which improves the intensity | strength by mutually connecting the pantograph mechanism 170 spaced apart by the front and rear two-row form, and the code | symbol 177 shown in FIG.1 and FIG.5 is an inner arm. It is a slide rail which slides the lower end of 172 according to raising / lowering operation.

  Furthermore, as shown in FIG. 4, the pair of lifting drive engagement chains 150 used in the engagement chain type lifting apparatus 100 according to the first embodiment of the present invention includes an inner tooth plate 151 having a hook portion and the inner teeth. An external tooth plate 152 that overlaps with the plate 151 by a half pitch in the longitudinal direction of the chain and has a hook portion, a bush 153 that connects and fixes the internal tooth plates 151 in the chain width direction, and an external fit to the bush 153 And a connecting pin 155 for connecting and fixing the external tooth plates 152 in the chain width direction, and meshing with each other while deflecting from the horizontal direction to the vertical direction along the chain guide plate 165 described above. Are lifted together in a self-supporting state and are offset from the vertical direction to the horizontal direction by the pair of lifting sprockets 140. It is arranged to branch off bite each other with.

  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 are engaged with each other in multiple rows in the chain width direction so as to be engaged with each other in a hook-like manner, and ascend and descend in a self-supporting state while supporting all loads including the mounted object. Even when an unbalanced load is applied to one side in the chain width direction of the lifting drive meshing chain 150, the buckling that tends to occur in the chain width direction of the lifting drive meshing chain 150 is reliably suppressed. It ensures excellent chain durability and avoids accidental chain cutting.

The opening leg angle detection sensor 180 that is the most characteristic feature of the meshing chain type lifting device 100 of this embodiment will be described in detail with reference to FIG.
First, as shown in FIG. 5, the open leg angle detection sensor 180 is installed at an intersection 174 where the inner arm 172 and the outer arm 173 intersect each other, and between the inner arm 172 and the outer arm 173. The leg angle is detected.

A control signal related to the opening angle between the links is output from the opening angle detection sensor 180 to the control means 164 of the drive motor 160 as shown in FIG. And a command, for example, a command for correcting the lift position of the lift table 110 is output to the drive motor 160 that drives the lift drive engagement chain 150.
In addition, the code | symbol 164a shown in FIG. 6 is PLC (programmable logic controller) which receives and calculates the control signal from the leg angle detection sensor 180, and the code | symbol 164b shown in FIG. 6 shows the electric power from a primary side power supply. A motor driver that controls the motor driver 164 c shown in FIG. 6 is a brake circuit that outputs a brake signal to the drive motor 160.

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.
Reference numeral 111 shown in FIGS. 1 and 2 is a slide mechanism that is recessed in the lifting table 110 that slides the upper end of the outer arm 173 in the horizontal direction along with the lifting drive.

  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.

In the meshing chain type lifting apparatus 100 of this embodiment obtained in this way, the open leg angle detection sensor 180 is installed in the pantograph mechanism 170.
Therefore, the expansion / contraction state of the pantograph mechanism 170 can be detected from the link angle measured by the open leg angle detection sensor 180, that is, between the inner arm 172 and the outer arm 173. In addition, it is possible to improve the positioning accuracy of the lifting table 110 in the vertical direction by controlling the lifting position of the lifting table 110. In particular, the lifting table includes the lifting object that tends to occur when the lifting object is loaded on the mounting surface of the lifting table 110. When the degree of compression of the lifting / lowering driving engagement chain 150 in the longitudinal direction of the chain changes due to the change in the weight of the chain 110, and the lift position of the lift table 110 changes, the change in the lift position of the lift table 110 is changed. The lift angle detection sensor 180 detects the lifting table based on this detection information. Because it can correct the vertical position of 10 can be achieved smooth out loading of the lifting thereof against the lifting table 110 by keeping the height of the loading surface of the lifting table 110 constant.

  In addition, a rotary encoder is installed on the lifting drive engagement chain 150 that tends to be compressed in the longitudinal direction of the chain due to the weight of the lifting table 110 including the object to be lifted and the lifting sprocket 140 that lifts and lowers the lifting drive engagement chain 150. Compared to the case, the meshing chain type lifting device 100 of the present invention can detect the expansion / contraction state of the pantograph mechanism 170 directly attached to the bottom surface side of the lifting table 110, so that the information about the lifting position of the lifting table 110 can be increased. The effect is enormous, such as being able to detect with high accuracy and realizing control of the lifting table 110 with high accuracy.

Next, a meshing chain lifting apparatus 200 that is a second embodiment of the present invention will be described below with reference to FIG.
Here, the configuration other than the open leg angle detection sensor 280 in the meshing chain type lifting device 200 according to the second embodiment of the present invention is exactly the same as that of the meshing chain type lifting device 100 of the first embodiment described above. The description relating to the meshing chain type lifting device 100 of the first embodiment, and the configuration other than the leg angle detection sensor 280 by replacing the reference numerals in the 100s shown in FIGS. Description is omitted.

Therefore, a specific form of the open leg angle detection sensor 280, which is the most characteristic of the meshing chain type lifting device 200 of the present embodiment, will be described in detail.
That is, as shown in FIG. 7, the open leg angle detection sensors 280 are arranged in the table width direction of the lifting table 210, that is, two pairs of pantograph mechanisms 270 arranged in front and rear with respect to the lifting table 210. The pantograph mechanism 270 is detected in an expanded / contracted state.

  Instead of installing the open leg angle detection sensor 280 at the intersection 274 of the pantograph mechanism 270, it may be installed at the joint part 275 of the pantograph mechanism 270. In this case, the same effect can be obtained. Can do.

In the meshing chain type lifting device 200 of the present embodiment obtained in this way, the open leg angle detection sensor 280 is arranged in the table width direction of the lifting table 210, respectively.
Therefore, by detecting and comparing the expansion and contraction states of the pantograph mechanisms 270 on both sides of the lifting table 210 in the table width direction, it is possible to detect the tilt of the lifting table 210 in the table width direction. By controlling the pantograph mechanism 270, it is possible to prevent an object to be lifted and the like from falling in the table width direction from the loading surface of the lifting table 210.

Next, a meshing chain lifting apparatus 300 that is a third embodiment of the present invention will be described below with reference to FIG.
Here, since the configuration other than the open leg angle detection sensor 380 in the meshing chain type lifting device 300 according to the third embodiment of the present invention is exactly the same as the meshing chain type lifting device 100 of the first embodiment described above, The description relating to the mesh chain type lifting device 100 of the first embodiment and the configuration other than the leg angle detection sensor 380 by replacing the reference numerals in the 100s shown in FIGS. 1 to 6 with the reference numerals in the 300s. Description is omitted.

Therefore, a specific form of the open leg angle detection sensor 380, which is the most characteristic feature of the meshing chain lift device 300 of this embodiment, will be described in detail.
That is, as shown in FIG. 8, the open leg angle detection sensor 380 is arranged in the longitudinal direction of the lifting table 310, that is, is installed for each of the pair of left and right joints 375 of the pantograph mechanism 370. The leg angle between the inner arm 372 and the outer arm 373 at each joint 375 is detected.

In the meshing chain type lifting device 300 of the present embodiment obtained in this way, the open leg angle detection sensor 380 is arranged in the longitudinal direction of the lifting table 310.
Therefore, by detecting and comparing the leg angle between the inner arm 372 and the outer arm 373 in each joint portion 375, the inclination of the elevating table 310 in the table longitudinal direction can be detected. Therefore, the pantograph is based on this detection information. The mechanism 370 can be controlled to provide a stable loading surface of the lifting table 310, and the effect is enormous.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall perspective view of a meshing chain lifting device that is a first embodiment of the present invention. The perspective view of the state which remove | excluded the raising / lowering table and the pantograph mechanism from FIG. FIG. 3 is a partially enlarged view of the vicinity of the lifting 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. The perspective view centering on a pantograph mechanism and a leg angle detection sensor. Explanatory drawing which shows the control means used for a drive motor. The perspective view which shows the pantograph mechanism of the meshing chain type raising / lowering apparatus which is 2nd Example of this invention, and an open leg angle detection sensor. The perspective view which shows the pantograph mechanism of the meshing chain type raising / lowering apparatus which is 3rd Example of this invention, and an open leg angle detection sensor.

Explanation of symbols

100, 200, 300 ... meshing chain type lifting device 110, 210, 310 ... lifting table 120, 220, 320 ... base plate 130, 230, 330 ... rotating shaft 140, 240, 340 ... Elevating sprockets 150, 250, 350 ... Elevating drive meshing chains 151, 251 and 351 ... Internal tooth plates 152, 252 and 352 ... External tooth plates 153, 253 and 353 ... Bushings 154 and 254 354 ... Rollers 155, 255, 355 ... Connecting pins 160, 260, 360 ... Drive motors 161, 261, 361 ... Drive side sprockets 162, 262, 362 ... Power transmission chain 163, 263, 363 ... Synchronous gear group 164, 264, 364 .. Control means 165, 265, 365... Chain guide plates 170, 270, 370... Pantograph mechanisms 171, 271 and 371... Pantograph members 172, 272 and 372 .. Inner arms 173, 273 and 373 ... Outer arms 174, 274, 374 ... Intersections 175, 275, 375 ... Joints 176, 276, 376 ... Connecting ribs 177, 277, 377 ... Slide rails 180, 280, 380 ... Opening angle detection sensors 190, 290, 390 ... Chain storage means 191, 291 and 391 ... Retractable chain storage boxes 192, 292 and 392 ... Linear storage rails

Claims (3)

A pair of elevating sprockets that are opposed to each other in the same plane and rotate forward and backward in the opposite direction around a pair of rotating shafts arranged parallel to the installation surface, and the pair of elevating sprockets from the horizontal direction A pair of elevating drive meshing chains that are engaged with each other while being deflected in the vertical direction 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 elevating sprockets. A lifting table that is installed at an upper end of the lifting drive meshing chain and moves up and down integrally; a drive source that drives the pair of lifting sprockets; In a mesh chain type lifting device provided with a pantograph mechanism that guides the lifting operation of the lifting table,
An engagement chain type lifting device, wherein an opening leg angle detection sensor for detecting an opening angle between links that constitute the pantograph mechanism and extend and contract is installed in the pantograph mechanism.   The meshing chain type lifting device according to claim 1, wherein the leg angle detection sensors are respectively arranged in a table width direction of the lifting table.   The meshing chain type lifting device according to claim 1 or 2, wherein the leg opening angle detection sensors are respectively arranged in a longitudinal direction of the lifting table.

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