JP2506390Y2 - Control device for boom device with lift - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a boom device with a lift, which supports a boom on a swivel base provided on a vehicle so that the boom can be raised and lowered and the lift can be raised and lowered along the boom.

[0002]

2. Description of the Related Art Conventionally, in a work vehicle such as an aerial work vehicle, a boom is rotatably pivoted on a swivel base provided on a vehicle body so that the boom can be swung up and down. A boom device with a lifting platform that is supported so as to be lifted and lowered is known. According to this boom device with a lifting platform, the tip of the boom is opposed to a desired working position by the turning of the swivel platform and the undulation of the boom, and then the lifting platform is raised along the boom to raise the worker to the working position. Can be moved to.

[0003]

By the way, in such a boom device with an elevator, if the swivel base or the boom is mistakenly driven when the elevator on which the worker rides is in the raised position, the worker will be lifted. May be shaken off. Further, if the elevator is accidentally driven when the boom is in the lying position, the elevator may come into contact with and damage the vehicle body or the building.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to regulate unnecessary operations of a swivel base, a boom, and a lift base to ensure work safety.

[0005]

In order to achieve the above-mentioned object, the present invention supports a boom mounted on a swivel mounted on a vehicle so that the boom can be raised and lowered, and a lift that lifts and lowers a lift along the boom. In a control device for a boom device with a base, a detector that detects that the lifting platform has risen from a lowered position, and a swing and undulation that regulates the swing of the swivel base and the undulation of the boom based on an output signal of the detector. It is provided with: a restricting unit, a detector for detecting that the boom upright angle is less than or equal to a predetermined value, and an elevating / lowering restricting unit for restricting the elevating / lowering of the elevating table based on an output signal of the detector. And

According to the above construction, when the lift is lifted away from the lowered position, the turning / raising / lowering restricting means restricts the turning of the turning base and the hoisting of the boom, so that the safety of the worker on the lifting base is ensured. To be done. Further, when the boom upright angle does not reach the predetermined value, the lifting control means restricts the drive of the lifting platform, and damage to the vehicle body, surrounding buildings, etc. due to the lifting platform is prevented.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 9 show an embodiment of the present invention. FIG. 1 is a schematic side view of an aerial work vehicle, and FIG. 2 is II of FIG.
3 is a sectional view taken along line III-III of FIG. 2, FIG. 4 is a sectional view taken along line IV-IV of FIG. 2, FIG. 5 is an enlarged view of a main part of FIG.
6 is a view taken in the direction of arrow VI in FIG. 5, FIG. 7 is a sectional view taken along the line VII-VII of FIG. 6, FIG. 8 is a hydraulic circuit diagram of the aerial work vehicle, and FIG. 9 is an electric circuit diagram of the aerial work vehicle. .

As shown in FIG. 1, this aerial work vehicle V is a van type vehicle. A turning drive mechanism 3 having a hydraulic motor 2 is provided on an upper part of a turret 1 provided at the rear of the vehicle. The swivel 4 driven through the support is supported. The boom 6 whose base end is pivotally supported by the pivot 5 on the upper part of the swivel table 4 is driven by an up-and-down cylinder 7 provided between the boom 6 and the swivel table 4, so that the boom 6 moves between a fall position shown by a solid line and an upright position shown by a chain line. Swing up and down between. A slide member 10 connected to the winch 8 via a cable 9 is slidably provided on the boom 6, and the slide member 10 supports an elevator 11 on which an operator is placed. The elevating table 11 is swingably supported by the slide member 10 so that the elevating table 11 can maintain a horizontal posture regardless of the ups and downs of the boom 6. A pair of left and right outrigger cylinders 12 are provided on both sides of the rear portion of the gantry 1 in order to maintain stability of the vehicle body during work.

FIG. 8 shows a hydraulic circuit for controlling the swing of the swivel base 4, the ups and downs of the boom 6, and the operation of the outrigger cylinder 12. As is apparent from the figure, this hydraulic circuit is a hydraulic pump 1 driven by an electric motor 13.
4 between the hydraulic pump 14 and the hoisting cylinder 7 of the boom 6, the hoisting cylinder solenoid valve 15 is provided.
In addition, a center joint 16 for connecting an oil passage between the gantry 1 and the swivel base 4 is interposed. Hydraulic pump 14
A hydraulic motor solenoid valve 17 is interposed between the hydraulic pump 2 and the hydraulic motor 2 of the swivel table 4, and an outrigger cylinder solenoid valve 18, 19 are interposed.

As shown in FIGS. 2 to 4, the turning drive mechanism 3 provided on the upper part of the gantry 1 includes a substrate 22 supported between two beams 21 located at the upper end of the gantry 1. The outer periphery of the boss 22 ₁ projecting from the center of the substrate 22 a ring-shaped guide member 23 is fixed by bolts 24, a ring-shaped worm wheel 26 through a ball bearing 25 on the outer periphery of the guide member 23 is rotatable Supported by The bracket 27 provided on one of the beams 21 includes the hydraulic motor 2
There is supported, worm gear 28 fixed to the output shaft 2 ₁ of the hydraulic motor 2 is meshed with the worm wheel 26. The upper surface of the worm wheel 26 the flange 29 ₁ of the cylindrical rotating shaft 29 is secured by bolts 30, the body of the ceiling V
_The swivel base 4 is fixed to the upper end of the cylindrical rotary shaft 29 extending upward from ₁ with bolts 31.

The center joint 16 for supplying pressure oil to the undulating cylinder 7 is provided with a rotary member 32 fitted in the central portion of the boss 22 ₁ of the base plate 22.
Connecting member 33 fixed to the upper surface of the engage the opening of the bracket 34 projecting from the flange 29 ₁ of the cylindrical rotating shaft 29. The joint 35 connected to the hydraulic pump 14 and one joint 36 connected to the undulating cylinder 7 are
The joint 37 connected to the return oil passage and the other joint 38 connected to the up-and-down cylinder 7 communicate with each other through _one circumferential groove 321 formed on the outer periphery of the rotary member 32. communicating via a circumferential groove 32 _2. Therefore, by driving the hydraulic motor 2, the cylindrical rotary shaft 2 is driven through the worm gear 28 and the worm wheel 26.
When 9 is rotated, the rotary member 32 is rotated together via the connecting member 33 to be engaged with the bracket 34 provided on the flange 29 _1. At this time, due to the action of the _two circumferential grooves 32 ₁ and 32 ₂ provided in the rotating member 32, the fixed joint 3
The communication between 5, 37 and the joints 36, 38 on the rotation side is maintained,
The supply of the pressure oil from the hydraulic pump 14 to the undulating cylinder 7 is performed without any trouble.

Next, the structure of the turning angle detecting means 39 for detecting the turning angle of the turntable 4 will be described. The turning angle detecting means 39 has an eccentric shaft 40 erected on the substrate 22, and is provided between a slave sprocket 41 rotatably supported on the upper end of the eccentric shaft 40 and a main sprocket 42 fixed on the outer periphery of the cylindrical member 29. The chain 43 is wound. Eccentric shaft 40
The lower end of the sub-sprocket 4 is attached to the base plate 22.
The eccentric shaft 4
By changing the mounting angle of 0, the sprocket 4
The tension of the chain 43 can be adjusted by moving the position 1 toward and away from the main sprocket 42. Eccentric shaft 4
A first turning end detection limit switch 46 as a detector for detecting a counterclockwise turning end of the swivel base 4 and a clockwise turning end A second turning end detection limit switch 47 is provided as a detector for detecting A dog 48 is mounted on the chain 43 as an operating member for operating the turning end detection limit switches 46 and 47. When the cylindrical member 29 rotates to rotate the swivel table 4, the dog 48 moves together with the chain 43 wound around the sprockets 41 and 42, and the dog 48 is moved to one of the turning end detection limit switches. By operating 46 and 47, the turning end of the turntable 4 is detected.

As shown in FIGS. 5 and 6, a coupling flange 6 ₂ is attached to a base portion 6 ₁ of a boom 6 pivotally supported by a pair of left and right brackets 4 ₁ extending rearward and upward from a swivel base 4 via a pivot shaft 5. A front portion 6 ₃ having a square cross section is connected via
Winch 8 to the electric motor 49 driving source is provided at its base _61. The front portion 6 ₃ lower surface of the boom 6 is a pair of left and right plate-like bracket 50 is parallel to fixed, while the other end of the relief cylinder 7 which is pivoted on the swivel deck 4 at one end with a pin 51 of the two brackets 50 It is pivotally supported by a pin 52. An auxiliary sheave 53 is provided between the two brackets 50 by a rotating shaft 54.
, And a pair of upper and lower sheaves 55 and 56 are supported in the vicinity of the tip of the boom 6 via rotating shafts 57 and 58, respectively. Then, one end of the slide member 1
The cable 9 tied to the rear connecting plate 59 provided on the bracket 0 is wound several times around the drum 61 of the winch 8 via the guide roller 60, and then the auxiliary sheave 53 and the boom 6 supported by the bracket 50. The slide member 10 is connected to the front connection plate 62 via two sheaves 55 and 56 provided at the front.

As will be apparent by referring to FIG. 7 together,
The slide member 10 which is slidably supported on the front portion 6 ₃ of the boom 6, the side plates 10 ₁ of the pair of left and right U-shaped cross section at the front and rear connecting plates 62,59 which was bound together, both sides the corners of the plate 10 ₁ in sliding contact with the surface of the boom 6 section L
A character-shaped slider 63 is provided. The brackets 64 extending rearwardly upwardly from the side of the side plates 10 _1, the lifting table 11 via a pivot shaft 65 is swingably pivoted back and forth. Then, from the drum 61 of the winch 8 to the bracket 50,
The cable 9 extending to the auxiliary sheave 53 supported by the above is disposed along the upper portion of the undulating cylinder 7 so as to avoid engagement with the undulating cylinder 7.

Returning to FIG. 1, the vehicle body of the aerial work vehicle V has a boom 6 in addition to the first and second turning end detection limit switches 46 and 47 for detecting the turning end of the turntable 4. The storage detection limit switch 66 that detects whether the storage position is indicated by the solid line, the standing detection limit switch 67 that detects that the boom 6 has stood up to 45 ° or more, the lift 1
A lowering detection limit switch 68 for detecting that 1 is at the lowering position and an uppering detection limit switch 69 for detecting that the elevator 11 is at the uppering position are provided.
A jack detection limit switch 72 is provided near the support link 71 of the leaf spring 70 that suspends the rear wheel, and detects that the outrigger cylinder 12 has operated and the rear wheel has left the road surface.

Next, the operation of the above-described embodiment of the present invention will be described with reference to FIG.
This will be described with reference to the electric circuit diagram of FIG.

First, when the main switch 73 is turned on while the boom 6 is stored and the lift table 11 is at the lowered position, the power lamp 74 is turned on. At this time, since the traveling side of the storage detection limit switch 66 is ON, the jack lamp 75 is lit to indicate that the outrigger cylinder 12 is operable.

From this state, jack switches 76, 77
Is operated to the extension side (left side), the electric motor 13 of the hydraulic pump 14 is started by the operation of the relay 78 to start discharging the hydraulic oil, and the solenoids 18 ₁ and 19 _{1 of} the solenoid valves 18 and 19 are excited. As a result, both outrigger cylinders 12 are extended (see FIG. 8), and the rear wheels are separated from the road surface. As a result, the jack detection limit switch 72 is
If N, the lowering detection limit switch 68 of the lift 11
Is in the ON state, the up / down turning lamp 79 is lit to indicate that the up / down and turning of the boom 6 is possible.

When the undulation switch 80 is operated to the erection side (right side) from this state, the electric motor 13 of the hydraulic pump 14 is operated via the relay 78, and at the same time, the solenoid 15 ₂ of the solenoid valve 15 is excited to excite the undulation cylinder. 7 extends (see FIG. 8), and the boom 6 starts to stand.
When the storage detection limit switch 66 is switched to the working side due to the rising of the boom 6, the power for the jack operation is turned off, the jack lamp 75 is turned off, and the subsequent operation of the outrigger cylinder 12 is restricted. Moreover, by operating the turn switch 81 on one side and the hydraulic motor 2 is activated by operating the solenoid 17 ₁ of the solenoid valve 17 at the same time the hydraulic pump 14 is energized to rotate the swivel deck 4, for example in a counterclockwise direction. At this time, when the chain 43 wound between the main sprocket 42 provided on the cylindrical member 29 and the sub sprocket 41 provided on the eccentric shaft 40 moves with the rotation of the swivel table 4, the dog 48 provided on the chain 43 moves. the solenoid 17 ₁ first pivot end detection limit switch 46 is operated is demagnetized, the swivel deck 4 is stopped at the pivot end of counterclockwise by. Conversely, when operating the turn switch 81 on the other side, the hydraulic motor 2 is reversed solenoid 17 ₂ is energized to rotate the swivel deck 4 in the clockwise direction. When the solenoid 17 ₂ by the dog 48 is second pivot end detection limit switch 47 operates to demagnetize, turning base 4
Stops at the clockwise turning end. At this time, by appropriately setting the length of the chain 43, the operating positions of the limit switches 46 and 47, that is, the counterclockwise turning end and the clockwise turning end of the turntable 4 can be arbitrarily adjusted. The turning angle of the turning table 4 is set to 360 ° or more, and a sufficient overlapping portion is provided at the turning angle to improve workability.

The rising angle of the boom 6 is 45 °.
Is exceeded, the elevating detection switch 67 is turned on, the elevating lamp 82 is lit, indicating that the elevating table 11 can be raised and lowered, and the relay 83 is excited so that the winch electric motor 49 can be operated. Become. Here, when the lifting switch 84 is operated to the raising side (left side), the relay 85 is excited, the electric motor 49 is started, and the lifting table 11 moves up along the boom 6 via the winch 8. And the lift 1
1 reaches the rising end and the rise detection limit switch 69
When FF is performed, the relay 85 is demagnetized and the electric motor 49 is demagnetized.
Stops. Conversely, move the elevating switch 84 down (to the right)
Is operated, the relay 86 is excited, the electric motor 49 rotates in the reverse direction, and the elevator 11 descends. Then, the lift table 11 reaches the lower end, and the lower detection limit switch 68 ₁ is turned off.
Then, the relay 86 is demagnetized and the electric motor 49 stops.

By the way, the intermediate portion of the cable 9 for driving the lifting table 11 is an auxiliary sheave 53 provided on the lower surface of the boom 6.
Therefore, there is no danger that the cable 9 will be shaken by the turning or undulation of the boom 6 to collide with the undulating cylinder 7 and be damaged or generate noise. In addition, since the cable 9 and the up-and-down cylinder 7 are arranged vertically, the cable 9 does not interfere with the up-and-down cylinder 7 even when the cable 9 moves right and left on the drum 61 of the winch 8, so that the width of the drum 61 is increased. With this arrangement, the amount of elevating the elevating table 11 can be increased.

When the lifting table 11 is not in the lowered position,
That is, when the lift base 11 starts to move up and the lowering detection limit switch 68 is turned off, the circuit of the hoisting switch 80 and the circuit of the turning switch 81 are cut off and the hoisting and turning lamp 79 is turned off. Is regulated, which ensures the safety of the worker on the platform 11. Also, the rising detection limit switch 67 is turned off.
As long as it is in the state of F, that is, the rising angle of the boom 6 is 4
Unless the angle reaches 5 °, the relay 83 is demagnetized, and the lift lamp 82 is turned off to restrict the lift of the lift table 11. Therefore, the movement of the lift table 11 prevents damage to the vehicle itself and surrounding buildings. .

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, but may be variously modified without departing from the present invention described in the claims for utility model registration. It is possible to make design changes.

For example, although the boom 6 of the embodiment is of a single stage type, the present invention can be applied to a multistage type boom capable of expanding and contracting. Further, as the detector, it is possible to use other means such as a proximity switch instead of the limit switch of the embodiment.

[0026]

As described above, according to the present invention, when the detector detects the rise of the lifting platform supported by the boom, the undulation / swing restricting means restricts the swing of the swivel base and the undulation of the boom. There is no risk of the worker being shaken off the lifting platform in the raised position. Further, until the detector detects that the upright angle of the boom has reached a predetermined value, the drive of the lifting platform is restricted by the lifting regulation means, so that the lifting platform is driven while the boom is in the lying position. This avoids the inconvenience of damage to the vehicle body and surrounding buildings due to the lift.

[Brief description of drawings]

FIG. 1 is a schematic side view of an aerial work vehicle.

2 is a view taken along the line II-II of FIG.

FIG. 3 is a sectional view taken along line III-III of FIG. 2;

4 is a sectional view taken along line IV-IV of FIG.

5 is an enlarged view of a main part of FIG.

6 is a view in the direction of arrow VI in FIG. 5;

7 is a sectional view taken along line VII-VII of FIG.

[Fig. 8] Hydraulic circuit diagram of aerial work vehicle

[Fig. 9] Electric circuit diagram of aerial work vehicle

[Explanation of symbols]

 4 Swivel base 6 Boom 11 Lifting base 67 Standing detection limit switch (detector) 68 Falling detection limit switch (detector)

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Toshiyuki Hirahara 1-6, Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Katsuya Yanagisawa 1-6-1, Uchisaiwaicho, Chiyoda-ku, Tokyo Japan Telegraph and Telephone Co., Ltd. (72) Inventor, Shuo Yakusaku, No. 25-17, Himonya, Meguro-ku, Tokyo Within Tokyo Telecom Co., Ltd. (72) Masami Yoshino, No. 25-17, Himonya, Meguro-ku, Tokyo Within Tokyo Communications Industrial Co., Ltd. (72) Inventor Hiroyuki Hosoda 1-25-17 Himonya, Meguro-ku, Tokyo Within Tokyo Communications Industrial Co., Ltd.

Claims (1)

(57) [Scope of utility model registration request] 1. A boom device with a lifting platform, wherein a boom (6) is supported by a swivel platform (4) provided on a vehicle so that the boom can be raised and lowered, and a lifting platform (11) is vertically supported along the boom (6). In the control device, the detector (68) for detecting that the lift base (11) has risen from the lowered position, and the swing and boom of the swivel base (4) based on the output signal of the detector (68). (6) Swinging / up and down regulating means for regulating ups and downs, and the boom (6)
A detector (67) for detecting that the rising angle of the elevator is less than or equal to a predetermined value, and an elevating / lowering restricting means for restricting the elevating / lowering of the elevating table (11) based on the output signal of the detector (67). A control device for a boom device with a lifting platform, which is characterized in that