JPH1149494A - Leveling device for workbench - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily perform a leveling of a mounted workbench and provide a leveling device with excellent stability when the workbench is mounted on a truck crane and this truck crane is simply used as a high attitude working car. SOLUTION: When a truck crane 10 is used as a high attitude working car, a work bench S is mounted at the tip part of a boom 13 so that the workbench S may freely oscillate in the vertical direction via a pivotal connecting pin Sp. A hook H is removed from the tip of a wire 19 and the tip of this wire 19 is fixed to the workbench S. By paying off and winding the wire 19 by operating a winch 18, the workbench S is oscillated and the leveling (the horizontal holding of the attitude) is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work table leveling device which is detachably attached to a boom tip of a crane device.

[0002]

2. Description of the Related Art Generally, a crane truck has a boom which can freely rotate, undulate, expand and contract, and the like, and a winch. The wire fed out of the winch is moved downward through a sheave provided at the end of the boom. It hangs down. In such a crane truck, the tip of the wire is attached to the object to be hoisted, the wire is wound by a winch, and the wire is lifted to perform a crane operation. By the way, depending on the crane truck, a work platform for an operator is detachably attached to the end of the boom.
Some are designed to be used for work at height.

[0003] As a leveling mechanism for a worktable attached to a crane truck as described above, a simple one that supports the worktable so as to be suspended and performs leveling by its own weight is generally known.

[0004]

However, such a mechanism has a problem that the stability is poor as compared with a leveling mechanism of a normal aerial work vehicle in which a workbench is leveled using a leveling cylinder. Was. On the other hand, in order to level the workbench using a leveling cylinder, as in a normal aerial work vehicle, it is necessary to arrange an oil supply hose to the end of the boom, etc. However, since the hydraulic oil has a high lift and a long oil passage, there is a problem that the hose cannot be easily operated due to design problems such as expansion of the hose and pressure loss.

The present invention has been made in view of such a problem, and an object of the present invention is to provide a leveling device which can easily perform leveling and has good stability.

[0006]

In order to achieve the above object, a leveling device according to the present invention comprises a boom capable of at least raising and lowering, a sheave attached to a tip of the boom, a wire, and a wire. A winch that winds and unwinds, hangs the wire unwound from the winch around the tip sheave and hangs down, attaches the tip to the object to be hoisted, winds the wire with the winch, and lifts the object to be hung. The crane device is configured to be detachably attached to the boom tip of a crane device that can be lifted, and to level the worktable that can swing up and down in the attached state. The work table is swung by fixing to the table and feeding and winding the wire with the winch to keep the work table horizontal. That.

According to such a configuration, the work table can be horizontally held by feeding and winding the wire in accordance with the ups and downs of the boom.

[0008] A base end sheave having the same diameter as the end sheave is provided at the base end of the boom, and the wire fed from the winch is wrapped around the base end sheave, extends toward the boom tip side, and is hung on the end sheave. The tip sheave is configured to be turned, and the distal sheave is configured such that its axis of rotation coincides with the pivot axis of the workbench, and the proximal sheave has its axis of rotation coincident with the boom undulation axis. Is preferred.

According to such a configuration, when the boom is raised and lowered, it is possible to maintain the posture of the worktable without drawing out and winding up the wire. If the posture of the table is horizontal, the posture of the work table can be maintained horizontal even when the boom is raised and lowered.

[0010] Further, the boom includes a first boom, a second boom mounted in the first boom so as to be extendable from the storage position toward the boom tip, and a boom in the second boom from the storage position toward the boom tip. The third boom is attached so as to be extendable, and the second boom is configured to perform a telescopic operation in which the expansion and contraction of the second boom with respect to the first boom and the expansion and contraction of the third boom with respect to the second boom are performed at the same time. In this case, a first telescopic sheave is attached to the distal end of the first boom, and a second telescopic sheave is attached to the proximal end of the second boom, and the wire fed out from the winch is connected to the boom proximal end. From the first telescopic sheave and the second telescopic sheave to extend toward the boom tip side and hang around the tip sheave, if the boom is extended or contracted, Pay-out of ya, it is possible to hold a work table of posture without performing the winding. For this reason,
If the workbench is horizontal before extending or retracting,
Even if the boom is extended and retracted, the posture of the worktable can be held horizontally.

[0011] Further, when the boom is configured to be able to undulate and expand and contract, an undulation angle detector for detecting an undulation angle of the boom and an extension amount detector for detecting an extension amount of the boom are provided.
Based on the information from the undulation angle detector and the elongation amount detector, the amount of undulation or expansion or contraction of the boom is detected, and the wire is fed or wound in accordance with the detected undulation or expansion or contraction amount. In addition, if the operation of the winch is controlled, the leveling operation can be automatically performed regardless of whether the operation is undulation or expansion / contraction.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a configuration of a crane truck 10 including a work bench leveling device according to the present invention. As shown in FIG.
A swivel 12 is mounted on 1 on a swivel-free basis. A boom 13 is attached to the upper part of the revolving base 12 via a pivot pin 14 so as to be able to move up and down (swing).
The boom 13 is configured to be extendable and contractible. A proximal end sheave 15 is rotatably attached to a proximal end thereof, and a distal end sheave 16 is rotatably attached to a distal end thereof. The diameters of the two sheaves 15 and 16 are the same, and the rotation axis of the proximal sheave 15 is
4 coincides with the central axis.

A winch 18 is attached to the lower part of the swivel base 12, and a wire 19 fed out of the winch 18 is wrapped around the base sheave 15 and extends to the boom tip side. As shown, it is hung around the tip sheave 16 and hangs downward. At the tip of the wire 19, a hook H is detachably attached. The hook H is hung on an object to be hung (not shown), and the winch motor 18m is driven to wind the wire 19 by the winch 18. It is configured such that a crane operation can be performed by, for example, lifting the object to be suspended and rotating the swivel table 12.

The crane truck 10 is constructed so that it can be used not only for such crane work but also for work at high places. The worktable S is attached via a pivot pin Sp so as to be vertically swingable. Here, the rotation axis of the above-described tip sheave 16 coincides with the central axis of the pivot pin Sp. The leveling of the work table S (horizontal holding of the posture) is performed by swinging the work table S by feeding and winding the wire 19, and the hook H is removed from the tip of the wire 19. Then, the tip of the wire 19 is fixed to the worktable S.

An operation device 31 for manually operating the operation of the winch 18 and an automatic leveling SW 32
Is provided. Here, in this example, the leveling at the time of the up / down operation of the boom 13 is performed by feeding the wire 19,
This operation is performed automatically without winding, and the leveling at the time of the expansion and contraction operation is performed by automatically feeding and winding the wire 19 in accordance with the expansion and contraction operation of the boom 13. Auto leveling SW
A switch 32 switches on / off of the latter feeding control.

FIG. 2 shows a device configuration relating to the feeding control. An operation signal from the operation device 31 and an on / off signal of the auto-leveling SW 32 are input to the controller 35. In addition to this controller 35,
The extension amount information of the boom 13 detected by the extension amount detector 33 is input. The controller 35, regardless of the on / off state of the signal from the auto-leveling SW 32,
When an operation signal is input from the operation device 31, an operation signal corresponding to the operation signal is output to the winch motor 18m.

When the signal from the auto-leveling SW 32 is ON, the extension / retraction operation of the boom 13 is detected from the extension amount information from the extension amount detector 33, and an operation signal corresponding to the extension / retraction amount is sent to the winch motor 18m. Output to However, when the signal from the auto-leveling SW 32 is ON, the extension / retraction operation of the boom 13 is detected, and when the operation signal from the operation device 31 is input, the operation signal corresponding to the extension / contraction amount and the operation signal And outputs a combined signal that combines both of the operation signals corresponding to.

Next, work at heights using such a crane truck 10 will be described. When starting the work, first, the worker gets on the work table S in a state where the boom 13 is contracted and laid down and the work table S is positioned below. When the operator gets on the worktable S, the operator first operates the operating device 31 appropriately to operate the winch 18 to adjust the amount of the wire 19 to be fed out, thereby leveling the worktable S.

After turning on the auto-leveling SW 32, the user operates a boom operation lever (not shown) to
The boom 13 is turned, raised and lowered, expanded and contracted as appropriate, and the work table S is moved to a desired height to perform work at a height. This crane truck 10
Then, the leveling at the time of the up / down operation of the boom 13 is as follows.
It is automatically performed without performing the feeding and winding of the wire 19, and the leveling at the time of the expansion and contraction operation is performed by automatically feeding and winding the wire 19 in accordance with the expansion and contraction operation of the boom 13. At this time, the workbench S is automatically leveled regardless of whether it is raised or contracted.

That is, the rotation axis of the base sheave 15 coincides with the swing (undulation) axis of the boom 13, and the rotation axis of the tip sheave 16 coincides with the swing axis of the worktable S. Are the same, even if the boom 13 is raised and lowered,
The total length of the portion of the wire 19 that comes into contact with the two sheaves is unchanged (see FIG. 3). Length L of wire 19 between winch 18 and proximal sheave 15
_1, the length L ₂ of the wire 19 between the proximal end sheave 15 and the tip sheave 16 is always constant (winch 1
Unwinding of the outer diameter of 19 bundles of wire wound on 8,
Ignore changes due to winding.) Therefore, boom 1
3 is moved up and down, the tip sheave 16 and the worktable S
, The length L ₃ of the wire 19 is always kept constant, and the leveling is automatically performed without the wire 19 being pulled out or wound up.

On the other hand, when the boom 13 is extended and retracted, when the amount of extension changes, the extension and contraction operation is performed by the controller 3.
5 is detected. Then, an operation signal is output to the winch motor 18m, and the wire 19 is automatically fed and wound by the same amount as the amount of expansion and contraction of the boom 13. Accordingly, the length L ₃ of the wire 19 is held constant between the tip sheave 16 and platform S, it is made as leveling workbench S.

Such leveling of the work table S is performed not only when the raising / lowering operation and the extension / contraction operation of the boom 13 are performed separately but also simultaneously.
When the posture of the workbench S is not horizontal during the operation of the boom 13, the operation device 31 can be manually operated to adjust the feeding amount of the wire 19, and fine adjustment of the leveling can be performed.

Further, in the above, the automatic leveling SW 32 is turned on after the posture of the work table S is horizontal, and when the boom is extended and retracted, the wire 19 is automatically fed and wound. Although the description has been given of the case where the operation is performed, the leveling for the extension / retraction operation of the boom may be performed by the manual operation of the operation device 31 while the auto leveling SW 32 is turned off.

As described above, in the above example, the sheaves 15,
By limiting the mounting positions of the booms 16 and making their diameters the same, leveling is performed without raising or lowering the wire for the up-and-down operation of the boom 13. Even if the mounting position and the diameter of the sheave are not particularly limited as described above, the leveling can be performed at the time of the up-and-down operation of the boom 13 by feeding and winding the wire 19 in response to the up-and-down operation of the boom 13.

In this case, in addition to the extension amount information of the boom 13 detected by the extension amount detector 33, as shown by a two-dot chain line in FIG. The angle information of the boom 13 is input. The controller 35 is an auto-leveling SW
In the case where the signal from 32 is ON, based on the extension amount information from the extension amount detector 33 and the undulation angle information from the undulation angle detector 34, the up and down operation of the boom 13 is detected. An operation signal corresponding to the amount of undulation and expansion / contraction is output to the winch motor 18m.

If the undulation and expansion and contraction are performed simultaneously, a combined signal is output that combines both the operation signal corresponding to the undulation and the operation signal corresponding to the expansion and contraction. Also, when the signal from the auto-leveling SW 32 is ON, the expansion or contraction or the undulation of the boom 13 is detected, and when the operation signal from the operating device 31 is input, the operation signal corresponding to the amount of the expansion or contraction or the undulation is And an operation signal corresponding to the operation signal is output.

Even in the case of such a configuration, at the start of the work, first, the operator operates the operating device 31 appropriately in a state where the boom 13 is contracted and laid down and the work table S is positioned below. Then, the winch 18 is operated to adjust the feeding amount of the wire 19, and the posture of the work table S is made horizontal. And, similarly, the auto-leveling S
After turning on the W32, the boom 13 is appropriately turned, undulated,
The work table S is moved to a desired height by expanding and contracting, and work at a height is performed.

In the second example, the boom 13 is raised and lowered and extended and contracted, and when the undulation angle or the amount of extension is changed, the up and down operation or the extended and contracted operation is detected by the controller 35. Then, an operation signal is output to the winch motor 18m, and the feeding and winding of the wire 19 are automatically performed in accordance with the amount of undulation or expansion and contraction of the boom 13. Accordingly, the length L ₃ of the wire 19 is held constant between the tip sheave 16 and platform S, it is made as leveling workbench S.

By the way, some crane trucks are constructed so that the amount of wire drawn out from the boom tip does not change even when the boom is extended and retracted. In such a crane truck, the boom is extended and retracted. In such a case, the worktable S can be automatically leveled without drawing out or winding up the wire.

FIG. 4 shows the configuration of such a crane vehicle 20. As shown in FIG.
Also, a swivel 22 is mounted on the vehicle body 21 so as to be freely rotatable, and a boom 23 is mounted on the swivel 22 so as to be able to move up and down. This boom 23 is the first boom 23
a, a second boom 23b, and a third boom 23c. These three-stage booms are telescopically configured to be telescopic. For convenience of explanation, the figure shows the ratio of the thickness of each boom larger than the actual one.

In the first boom 23, a proximal sheave 25 is rotatably attached to a proximal end thereof, and a first telescopic sheave 27 is rotatably attached to a distal end thereof. A second telescopic sheave 28 is rotatably attached to the proximal end of the second boom 23b, and a distal sheave 26 is rotatably attached to the distal end of the third boom 23c. In this example, the mounting positions of the base sheave 25 and the distal sheave 26 and their diameters are not particularly limited.

A winch 18 is attached to the swivel 22 in the same manner as in the above example. The wire 19 fed from the winch 18 is wrapped around the base sheave 25 and extends to the boom tip side. 1 It is wrapped around the telescopic sheave 27 and extends toward the base end of the boom. So that it hangs down.

Here, as described above, the boom 23 is configured to be extendable and retractable. The expansion and contraction operation is such that the expansion and contraction of the second boom with respect to the first boom and the expansion and contraction of the third boom with respect to the second boom are simultaneously performed. And it is comprised so that it may be performed at the same ratio. Therefore, when the boom 23 is expanded and contracted by the above-described wire looping configuration, the amount of wire 19 extending beyond the distal end sheave 26 does not change.

When the crane truck 20 constructed as described above is used for work at a high place, the worktable S is moved vertically through the pivot pin Sp at the tip of the third boom 23c as in the above-described example. Can be mounted to swing freely. The hook H is removed from the tip of the wire 19, and the tip of the wire 19 is fixed to the worktable S.

Here, in this example, as described above, when the boom 23 is extended and retracted, the amount of extension of the wire 19 beyond the distal end sheave 26 does not change. , Wire 19
This is done automatically without feeding and winding. On the other hand, the leveling at the time of the up / down operation is performed by automatically feeding and winding the wire 19 in accordance with the up / down operation of the boom 23.

FIG. 5 shows a device configuration relating to such a feeding control. As in the above example, an operation signal from the operation device 31 and an on / off signal of the auto-leveling SW 32 are input to the controller 45. I do. In this case, in addition to the controller 45, information on the undulation angle of the boom 13 detected by the undulation angle detector 34 is input. The controller 45 controls the auto-leveling SW3 in the same manner as in the above example.
Operating device 3 regardless of the on / off state of the signal from
An operation signal corresponding to the operation signal from the control unit 1 is output to the winch motor 18m.

When the signal from the auto-leveling SW 32 is ON, the up-and-down operation of the boom 13 is detected based on the up-and-down angle information from the up-and-down angle detector 34, and an operation signal corresponding to the up-and-down amount is transmitted to the winch. Output to the motor 18m. However, when the signal from the auto-leveling SW 32 is on, the up-and-down movement of the boom 13 is detected, and when the operation signal from the operating device 31 is input, the operation signal corresponding to the up-and-down amount and the operation signal A combined signal combining both of the corresponding operation signals is output.

Next, work at heights using the crane truck 20 will be described. Also in this case, at the start of the work, first, in a state where the boom 13 is contracted and folded down and the work table S is positioned below, the operating device 31 is appropriately operated to level the position of the work table S. Then, similarly, after turning on the auto-leveling SW 32, the workbench S is moved to a desired height by rotating, raising and lowering, and expanding / contracting the boom 13 as appropriate, thereby performing work at a height.

In the third example, as described above, the leveling during the extension / retraction operation of the boom 23 is automatically performed without feeding and winding the wire 19. On the other hand, the leveling during the undulating operation is performed by automatically feeding and winding the wire 19 in accordance with the undulating operation of the boom 23. That is, when the boom 23 is raised and lowered, the controller 45 detects the raising and lowering operation when the amount of raising and lowering changes. Then, an operation signal is output to the winch motor 18m, and the feeding and winding of the wire 19 are automatically performed in accordance with the amount of undulation of the boom 23. Thereby, the length of the wire 19 between the tip sheave 16 and the worktable S is kept constant, and leveling is performed. For this reason, the workbench S is automatically leveled regardless of whether it is raised or lowered or expanded and contracted.

As in the above example, such leveling of the worktable S is performed not only when the up-and-down operation and the expansion and contraction operation of the boom 23 are performed separately but also when they are simultaneously performed. Also in this case, when the posture of the workbench S is not horizontal during the operation of the boom 23, the operation device 31 is manually operated to adjust the feeding amount of the wire 19 and finely adjust the leveling. be able to. Further, it is also possible to perform the leveling with respect to the extension / retraction operation of the boom by the manual operation of the operation device 31 with the auto leveling SW 32 being turned off.

In the third example, the leveling is performed by raising and lowering the boom 23 by feeding and winding the wire 19.
And the mounting position of the tip sheave 26 and their diameters,
It can also be configured to be limited as in the first example.
In this case, the position of the workbench S is set to be horizontal and the winch 1
If the boom 23 is operated after the operation of the boom 23 is restricted, the leveling can be automatically performed without performing the feeding and winding of the wire 19 both when the boom 23 is raised and retracted and when the boom 23 is extended and retracted. it can.

In each of the first to third examples described above, the on / off of the auto-leveling SW 32 is switched by an operator who is on the work table S. A limit switch or the like that is turned on when the table S is mounted may be configured to be always turned on when the work table S is used. Even if the auto-leveling SW 32 is always on, as described above, the operation device 31
Is effective, and the leveling can be adjusted by the manual operation.

[0043]

As described above, according to the work table leveling apparatus of the present invention, the work table is rocked by fixing the tip of the wire to the work table and feeding and winding the wire with the winch. Since the work table is held horizontally, the leveling can be easily performed and the stability is good.

Further, the wire is extended around the proximal sheave and the distal sheave so as to be fixed to the work table, and the mounting positions of the proximal sheave and the distal sheave are limited. If the diameter is the same, the posture of the workbench can be maintained without unwinding and winding the wire when the boom is raised and lowered. For this reason, the feeding and winding of the wire for keeping the posture of the work table horizontal need only be performed for the expansion and contraction operation of the boom, and the winding control is simplified.

Further, the boom is composed of first to third booms, and the expansion and contraction of the second boom with respect to the first boom and the expansion and contraction of the third boom with respect to the second boom are performed simultaneously and at the same rate. If you configure
A first telescopic sheave attached to the distal end of the first boom and a second telescopic sheave attached to the proximal end of the second boom;
If it is configured to extend around the telescopic sheave and the tip sheave and be fixed to the workbench, the posture of the workbench can be adjusted without extending or winding the wire when the boom is extended or retracted. Can be held. For this reason, the feeding and winding of the wire for keeping the posture of the work table horizontal need only be performed for the up / down operation of the boom, and the winding control is simplified.

It should be noted that the boom undulation angle and the extension amount are detected, and based on this, the wire is automatically fed and wound in accordance with the undulation amount or the amount of expansion and contraction during operation of the boom. If the operation of the winch is configured to be controlled, the leveling can be automatically performed, thereby simplifying the operation.

[Brief description of the drawings]

FIG. 1 is a side view showing a configuration of a crane truck provided with a work bench leveling device of the present invention.

FIG. 2 is a block diagram showing an apparatus configuration relating to wire feeding control in the crane vehicle shown in FIG.

FIG. 3 is a schematic diagram showing a change in a state of a wire when the boom is raised and lowered in the crane truck of FIG. 1;

FIG. 4 is a side view showing the configuration of another crane truck equipped with the work bench leveling device of the present invention.

FIG. 5 is a block diagram showing a device configuration related to wire feeding control in the crane vehicle in FIG. 4;

[Explanation of symbols]

 10, 20 Crane truck (crane device) 13, 23 boom 15 proximal sheave 16 distal sheave 19 wire 18 winch 18m winch motor 23a first boom 23b second boom 23c third boom 27 first telescopic sheave 28 second telescopic Sheave 33 Extension detector 34 Elevation detector 35 Controller (winch control means) S Workbench

Continued on the front page (72) Inventor: Yuichi Yoshizawa 1152 Yamashita, Ryoji, Ageo City, Saitama Prefecture 10 Aichi Corporation Ageo Works

Claims (4)

[Claims] 1. A boom capable of at least raising and lowering, a tip sheave attached to a tip of the boom, a wire,
With a winch for winding and feeding out this wire,
The wire fed from the winch was hung around the tip sheave and hung downward, the tip was attached to a suspended object, and the winch wound the wire to lift the suspended object. A worktable leveling device that is detachably attached to the boom tip of a crane device, and that is capable of swinging up and down in an attached state, wherein the tip of the wire is fixed to the worktable, and the winch is used. By feeding and winding the wire,
A work table leveling device, wherein the work table is rocked to maintain the posture of the work table horizontally. 2. A base end sheave is provided at a base end of the boom, and the wire fed out from the winch is:
The base sheave is extended around the boom tip side by being wrapped around the base sheave, and is wrapped around the tip sheave.The tip sheave has a rotation axis coinciding with the swing axis of the worktable. The rotation axis coincides with the up / down axis of the boom, and the distal sheave and the proximal sheave are formed to have the same diameter. When the boom is raised and lowered, the wire is fed and wound. The worktable leveling device according to claim 1, wherein the worktable can be held horizontally without performing the operation. 3. The boom includes a first boom and a first boom.
A second boom mounted in the boom so as to be extendable from the storage position toward the boom tip, and a third boom mounted in the second boom so as to be extendable from the storage position in the boom tip direction.
The first boom is configured to perform a telescopic operation in which expansion and contraction of the second boom with respect to the first boom and expansion and contraction of the third boom with respect to the second boom are performed simultaneously and at the same ratio. A first telescopic sheave is attached to the distal end of the second boom, and a second telescopic sheave is attached to the base end of the second boom. The wire fed out from the winch is moved from the boom base end side to the second telescopic sheave. When the boom is extended and retracted around the first telescopic sheave and the second telescopic sheave and extended toward the boom tip side in this order, and the boom is extended and retracted, the wire is fed and wound. The leveling device for a workbench according to claim 1, wherein the workbench can be held horizontally without any movement. 4. The boom is configured to be able to undulate and expand and contract, an undulation angle detector for detecting an undulation angle of the boom, an extension amount detector for detecting an extension amount of the boom, and the undulation angle. Based on information from a detector and the extension amount detector, the amount of undulation or expansion and contraction of the boom is detected, and the wire is fed and wound in accordance with the detected amount of undulation or expansion and contraction. The work table leveling device according to claim 1, further comprising: a winch control means for controlling an operation of the winch.