JP5126568B2 - lift device - Google Patents

Description

  The present invention relates to an elevating device configured such that a wire that suspends and supports an elevating body that is guided so as to be movable up and down along a support is drawn out and taken up by forward and reverse rotation of a take-up drum.

Such a lifting device lifts and lowers the lifting body by rotating the winding drum forward and backward to feed and wind the wire, and is used when the article supported by the lifting body is moved up and down.
In such a lifting device, if the winding drum is suddenly stopped while the lifting body is moved up, the lifting body may move up due to inertia, and the winding drum is thus stopped. When the lifting / lowering body moves upward due to inertia, the wire is fed to the stopped winding drum from the lifting / lowering body side in the winding direction, and the wire wound on the winding drum is loosened and becomes a turbulent winding state. As a result, there is a possibility that normal winding and unwinding of the wire cannot be performed.
Therefore, conventionally, a wire braking means that can be switched between a braking state in which the wire is held between the lifting body and the winding drum by a pair of pads and a braking release state in which the holding of the wire by the pair of pads is released. And a control means for controlling the operation of the wire braking means, and when the take-up drum is suddenly stopped by causing the wire brake means to be in a braking state by the control means when the take-up drum is suddenly stopped. Even if the lifting / lowering body moves upward due to inertia, the wire wound around the take-up drum does not loosen so that the portion of the wire on the side of the take-up drum is not loosened from the portion held by the wire braking means. Some have been configured to prevent the situation from occurring (see, for example, Patent Document 1).
Incidentally, the wire braking means includes a pair of pads for holding the wire, a spring for biasing one pad toward the side separating from the other pad, and one pad against the biasing force of the other spring. The control device is configured to control the operation of the solenoid in the wire braking means.

JP 2001-302186 A

  However, in the above-described conventional lifting device, in order to prevent the wire from being in a turbulent winding state on the winding drum when the lifting body floats due to inertia, wire braking means including a pair of pads, a spring, and a solenoid; Control means for controlling this operation must be provided, and for this reason, the configuration for preventing the wire from being in a turbulent winding state is complicated and causes weight.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an elevating device that can simplify the configuration for preventing the wire from being in a turbulent winding state and can be reduced in weight. It is in.

In order to achieve this object, the lifting device according to the present invention is configured such that the wire that suspends and supports the lifting body guided so as to freely move up and down along the column is fed and wound by forward and reverse rotation of the winding drum. The first characteristic configuration is as follows:
A suspension support member that is in contact with a supported portion of the lifting body so as not to move upward and is movable downward is connected to an end of the wire, and the suspension support member is supported by the supported portion. A tension spring biasing downward with respect to the portion is disposed between the suspension support member and a spring mounting portion below the supported portion of the lifting body, and the lifting body is moved to the article. A front-rear frame that supports the mounting device, and a vertical frame that stands upright at an end of the front-rear frame, the supported portion is provided at the upper end of the vertical frame, The spring mounting portion is provided at the lower end portion of the downward frame .

  That is, the suspension support member connected to the end portion of the wire is in contact with the supported portion of the elevating body so as not to move upward and to be movable downward, and is connected to the end portion of the wire. Since the lifting / lowering body is received and supported by the suspended support member, when the winding drum feeds the wire, the lifting / lowering body moves down together with the suspension support member, and the winding drum winds the wire. As a result, the elevating body rises together with the suspension support member.

  A tension spring that urges the suspension support member downward with respect to the supported portion is disposed between the suspension support member and a spring mounting portion below the supported portion of the lifting body. Thus, even if the lifting body is lifted and moved by inertia by suddenly stopping the take-up drum when the lifting body is moved upward, the suspension support member is moved downward with respect to the supported portion by the pulling action of the tension spring. Since the tension spring can be shortened in accordance with the upward movement due to the inertia of the elevating body and the tension state of the wire can be maintained by moving the wire to the winding drum, the wire wound on the winding drum becomes a turbulent winding state. Can be prevented.

And, in order to move the suspension support member downward with respect to the supported portion, a large stroke is required that is equal to or greater than the amount by which the lifting body is lifted by inertia. Therefore, the suspension support member is moved downward with respect to the supported portion as compared with the structure in which the compression spring is extended in accordance with the upward movement due to the inertia of the elevating body. Therefore, it is easy to configure so as to obtain a large stroke.
In other words, a compression spring that urges the suspension support member downward with respect to the supported portion is disposed between the suspension support member and the supported portion, and the lifting body is moved up by inertia. In this case, if the compression spring is configured to extend in accordance with the upward movement due to the inertia of the elevating body and maintain the tension state of the wire, if the compression spring is long, the compression spring is Since it is easy to bend, a guide member that guides the compression spring is required so that the compression spring does not buckle. Therefore, it is necessary to lengthen the compression spring and move the suspension support member downward relative to the supported portion. Although it is difficult to configure so that the stroke can be obtained, as described above, the tension spring is shortened in accordance with the ascending movement of the lifting body, and the tension state of the wire is maintained. Then, even if the tension spring is made long, it will not be compressed, so there is no need for a guide member to guide the tension spring so that the tension spring does not buckle. It is easy to configure so that a large stroke can be obtained to move the member downward relative to the supported portion.

  Therefore, the suspension support member that is in contact with the supported portion of the lifting body so as not to move upward and is movable downward is connected to the end portion of the wire, and the suspended support member and the supported portion of the lifting body are supported. It is wound around the take-up drum with a simple configuration in which a tension spring that biases the suspension support member downward with respect to the supported portion is disposed between the spring mounting portion below the portion. It is possible to prevent the wire being in a turbulent winding state, so that the structure for preventing the wire from being in a turbulent winding state can be simplified and the weight can be reduced. Therefore, it has become possible to provide an elevating device that can be reduced in weight by simplifying the configuration for preventing this.

  According to a second characteristic configuration of the lifting apparatus of the present invention, in the first characteristic configuration, the suspension support member is inserted in a vertically movable manner with respect to the insertion hole in the supported portion, and the wire is connected to the upper end portion. And a contact body which is attached to the supported portion so as not to move upward and to be movable downward and to adjust the position in the longitudinal direction to the rod-shaped body. It is composed of

  That is, the contact body that is in contact with the supported part so as not to move upward and is movable downward is inserted into the insertion hole in the supported part so as to be movable up and down, and a wire is provided at the upper end. Since the position in the longitudinal direction is attached to the connected rod-shaped body so that the position of the rod-shaped body is adjustable, it is suspended by a wire by adjusting the position where the contact body is mounted in the rod-shaped body in the longitudinal direction of the rod-shaped body. The height of the lifting body supported by being lowered can be adjusted, so even if the position of the lifting body becomes lower than the preset setting position due to the elongation of the wire due to secular change, the contact body is moved to the upper end in the longitudinal direction. By adjusting so as to move to the side, the position of the lifting body can be set to a preset position, so that the lifting apparatus can cope even when the wire is extended due to secular change It came to be able to provide.

  A third characteristic configuration of the lifting device according to the present invention is the first or second characteristic configuration, in which the position of the suspension support member with respect to the supported portion is lowered by a set amount or more from an appropriate position where the suspension support member contacts the supported portion. A descent detecting means for detecting this is provided.

  That is, when the position of the suspension support member relative to the supported portion is lowered by a set amount or more from the appropriate position contacting the supported portion, it is detected by the lowering detection means. An elevating device that can detect when the elevating body is largely levitated or when the wire is cut, can be detected by the descent detecting means, and can detect when the elevating body is largely levitated or the wire is cut. I was able to do it.

The 4th characteristic structure of the raising / lowering apparatus concerning this invention exists in the point by which the said support | pillar is standingly arranged from the traveling trolley in any one of the 1st-3rd characteristic structure.

  That is, since the structure for preventing the wire from being in a turbulent winding state can be simplified and lightened as described above, the prop is provided on the traveling carriage and the lifting body is equipped with the article transfer device. For example, when equipped with a self-propelled object such as a stacker crane, a traveling carriage can be made to travel with small power, and thus an elevating device that is advantageous when provided on a traveling carriage is provided. I was able to do it.

Hereinafter, an embodiment will be described with reference to the drawings when the lifting device according to the present invention is applied to a stacker crane provided in an article storage facility.
As shown in FIG. 1, the article storage facility is configured to store articles between an article storage shelf 2 provided with a plurality of storage units 1 arranged vertically and horizontally, and the article storage shelf 2 and a loading and unloading device 3 for loading and unloading. A stacker crane 4 to be conveyed is provided.

The two article storage shelves 2 are provided at an interval so that the article loading / unloading direction faces each other. A traveling rail 7 is installed on the floor between the two article storage shelves 2, and the stacker crane 4 is provided so as to reciprocate between the two article storage shelves 2 along the traveling rail 7. ing.
The placement and transport device 3 includes a roller-type transport device 5 that places and transports articles, and a belt-type transport device 6 that can be moved up and down and is provided at an end of the roller-type transport device 5 on the side of the article storage shelf 2. The article can be transferred between the roller type conveying device 5 and the belt type conveying device 6 by moving the belt type conveying device 6 up and down. It is configured such that an article can be transferred between the stacker crane 4 and itself in a state where it is moved up.
Hereinafter, one side of the stacker crane 4 in the traveling direction (front-rear direction) is referred to as the HP side (upper left side in FIG. 2), and the other side is referred to as the OP side (upper right side in FIG. 2).

Next, the stacker crane 4 will be specifically described.
As shown in FIG. 2, the stacker crane 4 is provided with a wire 15 that suspends and supports an elevating platform 11 as an elevating body guided so as to be movable up and down along a support column 14. And a lifting device A configured to be wound up.
The lifting / lowering table 11 is moved up and down when the winding drum 19 is driven to rotate forward and backward by the lifting / lowering electric motor 20 and the wire 15 is fed and wound.
The column 14 is erected from the OP side end of the traveling carriage 10, and the column 14 is configured such that the OP side end of the lifting platform 11 is guided to be raised and lowered.

The traveling carriage 10 is provided with two front and rear wheels 24 that can freely travel on the traveling rail 7, and one of the two wheels 24 on one end side in the horizontal movement direction is driven by a traveling electric motor 25. The wheel 24 at the other end in the horizontal movement direction is configured as a freely driven driven wheel 24b.
And it is comprised so that the driving | running | working trolley | bogie 10 may drive | work along the front-back direction by rotating the driving wheel 24a forward / reversely with the electric motor 25 for driving | running | working.

  As shown in FIG. 2, the lifting device A is configured to include a wire 15 that suspends and supports the lifting platform 11, and a winding drum 19 that feeds and winds the wire 15. The wire 15 is suspended and supported, and the wire 15 is connected to the upper end portion of the support column 14 and is wound around a guide pulley 17 provided on an upper frame 16 that is guided along the guide rail 8. 10 is connected to a take-up drum 19 provided at the end on the OP side.

When the elevator 11 is described, as shown in FIG. 3, the elevator 11 includes a pair of front and rear frames 41 in a posture along the front and rear direction and a vertical frame 42 in a posture along the vertical direction. The vertical frame 42 is erected on the OP side end of the front / rear frame 41 so that the shape in a side view is L-shaped.
As shown in FIG. 4, each of the front-rear frame 41 and the vertical frame 42 is provided in a pair spaced apart in the lateral width direction, and the pair of front-rear frames 41 are the front end portions on the HP side. Are connected by a front end side connecting member 43, and a pair of vertical frames 42 are connected by an upper end side connecting member 45 as a supported portion at the upper end portion, and as a spring mounting portion at the lower end portion. The lower end side connecting member 44 is connected.

Each of the pair of vertically facing frames 42 is connected to a roller support plate 46 in a cantilever manner so as to protrude to the OP side, and the lifting platform 11 is attached to the support plate 14 with respect to the roller support plate 46. A plurality of restriction rollers 47 are provided for restricting movement in the width direction, movement of the lifting platform 11 in the front-rear direction with respect to the column 14, and tilting of the lifting platform 11 with respect to the column 14. Yes.
The elevator 11 is equipped with a conveyor-type article transfer device 12, and the article transfer device 12 transfers the article between itself and the storage unit 1 or the loading / conveying device 3. Is configured to do.

As shown in FIG. 6, the stacker crane 4 is provided with a crane control device 28 that controls the operation of the stacker crane 4. Various information is transmitted between the crane control device 28 and the ground-side controller 9. Communication is possible, and the ground-side controller 9 is configured to give various commands to the crane control device 28. Incidentally, as shown in FIG. 1, the ground-side controller 9 is provided on the floor surface on the HP side from the article support base 3.
The traveling carriage 10 is provided with a traveling rotary encoder 21 that outputs a pulse as the traveling carriage 10 travels, and the lifting platform 11 includes a lifting rotary that outputs a pulse as the lifting platform 11 moves up and down. An encoder 22 is provided, and the crane control device 28 manages the traveling position of the traveling carriage 10 based on the pulse signal output from the traveling rotary encoder 21, and based on the pulse signal output from the elevating rotary encoder 22. It is comprised so that the raising / lowering position of the raising / lowering stand 11 may be managed.
That is, the crane control device 28 causes the traveling carriage 10 to travel while managing the traveling position of the traveling carriage 10 based on the command from the ground-side controller 9, and also manages the lifting position of the lifting platform 11. 11 is moved up and down, and the goods which are stored in the storage unit 1 of the article storage shelf 2 and the goods stored in the storage part 1 of the article storage shelf 2 are stored in the storage unit 1 of the article storage shelf 2 It is comprised so that the unloading operation | work which takes out to the mounting conveyance apparatus 3 for loading / unloading may be performed.

Next, the support structure of the lifting platform 11 by the lifting device A will be described.
As shown in FIGS. 4 and 5, the suspension support member 31 that is in contact with the upper end side connecting member 45 of the elevator 11 so as not to move upward and to be movable downward is provided on the wire 15. A tension spring 32 that is connected to an end portion and biases the suspension support member 31 downward with respect to the upper end side connection member 45 from the suspension support member 31 and the upper end side connection member 45 of the elevator 11. Is also disposed between the lower end side connecting member 44 below.
The suspension support member 31 is inserted into the insertion hole 45a in the upper end side connection member 45 so as to be movable up and down, and the rod 15 is connected to the upper end portion of the wire 15 and the upper end side connection member 45. A contact body 37 is attached to the rod-like body 36 so that the position in the longitudinal direction is adjustable so as to be immovable upward and movable downward.

In other words, as shown in FIG. 4, three nuts 38 are screwed into the rod-like body 36 to which the ends of the wires 15 are connected so as to be arranged in the vertical direction. The contact body 37 is formed in a cup shape in which a cylindrical peripheral wall portion 37b is erected on a circular bottom portion 37a.
The contact body 37 is a state in which the rod-shaped body 36 is inserted into the hole formed in the bottom portion 37 a and the first nut 38 from the top among the three nuts 38 screwed into the rod-shaped body 36. Are attached to the rod-like body 36 with the bottom part sandwiched between the nut 38 from the top and the three nuts 38 by rotating and operating the three nuts 38 in the vertical direction. The position of the contact body 37 in the longitudinal direction of the rod-shaped body 36 can be adjusted.

The diameter of the peripheral wall portion 37 b in the contact body 37 is formed larger than the diameter of the insertion hole 45 a in the upper end side connecting member 45, and in the state where the lifting platform 11 is suspended and supported by the wire 15, the contact body. 37 is configured to contact the upper end side connecting member 45 so as not to move upward.
Further, the lower surface of the upper end side connecting member 45 is formed as a flat surface, and there is nothing that restricts the downward movement of the contact body 37, and in a state where the lifting platform 11 is suspended and supported by the wire 15. The contact body 37 is configured to contact the upper end side connecting member 45 so as to be movable downward.

  The tension spring 32 is disposed so as to be aligned with the rod-shaped body 36 between the rod-shaped body 36 and the lower end side connecting member 44 in the suspension support member 31, and as shown in FIG. Even if the rotation of the take-up drum 19 is suddenly stopped when the take-up drum 19 is rotated to raise the lift 11, the lift 11 is lifted by inertia as shown in FIG. The bending of the wire 15 due to this can be absorbed smoothly by the shortening of the tension spring 32.

As shown in FIG. 4, below the contact body 37, the position of the suspension support member 31 with respect to the upper end side connection member 45 is lowered by a set amount or more from an appropriate position where it contacts the upper end side connection member 45. A descent detecting means 48 constituted by a limit switch for detecting this is provided. The crane control device 28 is configured to control the operation of the alarm device 49 based on the detection signal from the lowering detection means 48.
That is, for example, if the rod-like body 36 is pulled downward by the tension spring 32 and the contact body 37 is lowered by more than a set amount from an appropriate position where it comes into contact with the upper side connecting member 45, the contact body 37 of the contact body 37 is lifted. The descending movement is detected by the descending detecting means 48, and based on this detection signal, the crane control device 28 operates the alarm device 49 to turn on the alarm lamp.

[Another embodiment]
(1) In the above embodiment, the support column 14 is erected from the OP side end portion of the traveling carriage 10, and the OP side end portion of the lifting platform 11 is guided by the support column 14 so as to freely move up and down. The support column 14 is erected from the HP side end portion and the OP side end portion of the traveling carriage 10, and the HP side end portion and the OP side end portion of the lifting platform 11 are guided by these support columns 14 so as to be movable up and down. It may be configured.

(2) In the above embodiment, the contact body 37 is configured in a cup shape with the bottom portion and the cylindrical portion. However, the contact body 37 may be configured in a plate shape, and the shape of the contact body 37 is appropriately changed. Is possible.

(3) In the above-described embodiment, the lowering detection unit 48 is configured to detect that the lifting platform 11 has floated when the take-up drum 19 is suddenly stopped. You may comprise so that it may detect that the wire 15 cut | disconnected.
In other words, in the above-described embodiment, the crane control device 28 is configured to control the operation of the alarm device 49 so as to issue an alarm based on the detection information of the descending detection means 48, so that the elevator 11 is largely lifted. In such a case, for example, there is a possibility that the article supported by the lifting / lowering base 11 has collapsed due to the rising / lowering of the lifting / lowering base 11. When the lifting platform 11 is suspended and supported by the two wires 15, the crane control means 28 operates the winding drum 19 so as to suddenly stop the winding drum based on the detection information of the lowering detection means 48. When the lowering detection unit 48 detects the disconnection of one of the two wires 15, the winding detection is performed based on the detection information of the lowering detection unit 48. The drum 19 may be configured to stop suddenly, and when the lifting platform 11 is supported by being suspended by a single wire 15, it is provided with a fall prevention means for preventing the lifting platform 11 from falling and is lowered. When the detection unit 48 detects the cutting of the wire 15, the fall prevention unit may be operated based on the detection information of the lowering detection unit 48 to prevent the lifting platform 11 from falling.
When the lowering detection means 48 detects that the wire 15 has been cut, the lowering detection means 48 is disposed below the position provided in the above embodiment, and the detection is made to the extent that the lifting platform 11 is lifted. Configure not to. Further, a plurality of lowering detection means 48 may be provided so that both the rising and lowering of the elevator 11 and the cutting of the wire 15 can be detected.

Perspective view of goods storage equipment Side view of stacker crane Side view of lifting platform Plan view of lifting platform Rear view of elevator Control block diagram of stacker crane Action diagram of stacker crane

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Traveling carriage 11 Lifting body 12 Article transfer apparatus 14 Support | pillar 15 Wire 19 Winding drum 31 Suspension support member 32 Tensile spring 36 Rod-shaped body 37 Contacting body 44 Spring mounting part 45 Supported part 45a Insertion hole 48 Lowering detection means A lift device

Claims (4)

A lifting device configured to suspend and support a lifting body guided so as to be able to move up and down along a support, and to be fed and wound by forward and reverse rotation of a winding drum,
A suspension support member that is in contact with the supported portion of the lifting body so as not to move upward and to be movable downward is connected to the end of the wire,
A tension spring that urges the suspension support member downward with respect to the supported portion is disposed between the suspension support member and a spring mounting portion below the supported portion in the lifting body. It is,
The lifting body includes a front-rear frame that supports the article transfer device, and a vertical frame that is erected on an end of the front-rear frame,
An elevating device in which the supported portion is provided at an upper end portion of the vertical frame, and the spring mounting portion is provided at a lower end portion of the vertical frame .   The suspension support member is inserted into the insertion hole in the supported portion so as to be movable up and down, and has a rod-like body having the upper end connected to the wire, and cannot be moved upward with respect to the supported portion. 2. The lifting device according to claim 1, further comprising a contact body that is movably contacted downward and is attached to the rod-shaped body so that its position in the longitudinal direction is adjustable.   The elevating device according to claim 1 or 2, further comprising a descent detecting means for detecting that a position of the suspension support member with respect to the supported portion is lowered by a set amount or more from an appropriate position contacting the supported portion. . It said struts, lifting apparatus according to claim 1 which is erected from the traveling vehicle.

Images