JP2522267Y2 - Turning control device for boom device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a turntable which has a boom which can be raised and lowered and which is supported on a mount of a working vehicle so as to be turnable, a drive source for driving the turntable, and a drive for the drive source. And a turning angle detecting means for detecting a turning angle of the turning table in order to control the turning angle of the turning table.

[0002]

2. Description of the Related Art Conventionally, in a working vehicle equipped with a boom device such as an aerial work vehicle, a crane truck, or a concrete pump truck, the turning angle of a swivel table supporting the boom device is set to slightly exceed 360 °. Is known (see Japanese Utility Model Laid-Open No. 58-111257). When the swivel base is swiveled 360 ° or more and a predetermined overlapping portion is set in the swivelable range, it is necessary to move the swivel base slightly counterclockwise from a certain work position to a target work position, for example. If there is, it is possible to turn the turntable counterclockwise and move it directly to the target work position without turning the turntable counterclockwise by nearly 360 °, thereby improving workability. Can be done.

[0003] In the above-mentioned conventional turning restricting device, the base end of a bracket is pivotally supported on a base of a working vehicle so as to be swingable.
The swingable range of the bracket is restricted by a pair of stoppers, and a revolving base supported by a gantry is provided with a projection that can contact the tip of the bracket. Swings and comes into contact with the stopper, thereby detecting the turning end of the turntable and stopping the turntable. Thus, according to this turning restriction device, it is possible to increase the turning angle of the turntable beyond 360 ° by the swingable range of the bracket, and set a predetermined overlapping portion in the turnable range. Become.

[0004]

However, in the above-described conventional turning restricting device, an overlapping portion of the swivelable range is formed by engagement of the projecting piece on the turning table side with the bracket on the gantry side. However, there is a problem that the engagement between the projection piece and the bracket is disengaged even if it is set to be large, and a sufficient overlapping portion of the swivelable range cannot be secured.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a turning control device for a boom device capable of sufficiently securing an overlapping portion of a swiveling range of a turning table supporting a boom device. Aim.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a swivel having a boom which can be raised and lowered and supported by a mount of a working vehicle so as to be able to swivel. A turning source of the boom device, comprising: a driving source that controls the driving of the turning source; and a turning angle detecting unit that detects a turning angle of the turning table to control the driving of the driving source. The main sprocket provided, a slave sprocket provided on the gantry side, a chain wound between the two sprockets, a detecting member provided on the chain, and a detector operated by the detecting member, I do.

According to the above arrangement, when the swivel is driven by the driving source, the chain wound between the main sprocket provided on the swivel and the slave sprocket provided on the gantry moves. As a result, at the revolving end of the revolving base, the detector is operated by the detecting member provided on the chain to stop the driving source, so that the left and right revolving ends of the revolving base are regulated. At this time, by appropriately setting the positional relationship between the detection member and the detector provided on the chain, the size of the overlapping portion exceeding the turning angle of the swivel table of 360 ° can be arbitrarily set.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment 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 in 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 above a tower-like mount 1 provided at the rear of the vehicle body. 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 platform 11 is swingably supported by the slide member 10 so as to 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 turning of the swivel 4, the raising and lowering 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.
And a solenoid valve 15 for the up / down cylinder between the hydraulic pump 14 and the up / down cylinder 7 of the boom 6.
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 at the upper part of the gantry 1 has 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 hydraulic motor 2 is mounted on a bracket 27 provided on one beam 21.
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.

[0013] The center joint 16 for supplying pressurized oil to the relief cylinders 7, a rotating member 32 to be fitted in the center of the boss 22 _first substrate 22, the rotating member 32
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, the joint 3 on the fixed side is formed by the action of the _two circumferential grooves 32 ₁ and 32 ₂ provided in the rotating member 32.
The communication between the joints 5, 37 and the rotating joints 36, 38 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 turning table 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 sprocket 4 is attached to the base plate 22 at the lower end thereof.
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.

[0015] Figures 5 and 6, the base ₆₁ of the boom 6 is pivotally supported on a pair of left and right brackets 4 ₁ via a pivot shaft 5 extending rearward and upward from the swivel base 4, connecting flange 6 ₂ It is above 6 ₃ having a rectangular cross-section through the coupled,
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.

Referring to FIG. 7 together, it is apparent that
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 on the cylinder 7 is disposed along the upper part of the cylinder 7 to avoid engagement with the cylinder 7.

Returning to FIG. 1, 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 boom 6 is provided on the body of the aerial work vehicle V. A storage detection limit switch 66 that detects whether the boom 6 is at the storage position indicated by the solid line, an upright detection limit switch 67 that detects that the boom 6 has been raised up to 45 ° or more, and an elevator 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 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 in a state where the boom 6 is stored and the elevator 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, the 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.

[0021] By operating the relief switch 80 to the standing side (right side) in this state, the electric motor 13 is operated the hydraulic pump 14 via the relay 78, derricking cylinder is excited solenoid 15 _{and second} solenoid valve 15 is simultaneously 7 extend (see FIG. 8), and the boom 6 starts to rise.
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 upright 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 elevator 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, lowering the detection limit switch 68 ₁ is OFF elevator platform 11 reaches the lowermost position
Then, the relay 86 is demagnetized and the electric motor 49 stops.

An intermediate portion of the cable 9 for driving the elevator 11 is provided with 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 elevator 11 is not in the lowered position,
That is, when the lift base 11 starts ascending and the descent detection limit switch 68 is turned off, the circuit of the up / down switch 80 and the circuit of the swivel switch 81 are cut off, the up / down swivel lamp 79 is turned off, and the up / down of the boom 6 and the swivel base 4 are turned off. Is regulated, and thereby the safety of the worker on the lift 11 is ensured. Also, the rising detection limit switch 67 is turned off.
F, that is, when the upright angle of the boom 6 is 4
As long as the angle does not reach 5 °, the relay 83 is demagnetized and the elevating lamp 82 is turned off, thereby restricting the elevating platform 11 from moving up and down. Therefore, damage to the vehicle itself and surrounding buildings due to movement of the elevating platform 11 is prevented. .

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

For example, other means such as a proximity switch can be used as a detector instead of the limit switch of the embodiment. Further, instead of providing the main sprocket 42 directly on the cylindrical member 29 which is the rotation axis of the swivel table 4, the main sprocket 42 can be rotated in conjunction with the swivel of the swivel table 4.

[0027]

As described above, according to the present invention, the detection of the revolving end of the revolving base by the revolving angle detecting means determines that the chain is located between the main sprocket provided on the revolving base side and the slave sprocket provided on the gantry side. It is performed by operating the detector with the detection member provided on the chain, so if the relative distance between the detection member provided on the chain and the detector is adjusted, the position of the turning end can be arbitrarily set. Can be set.
As a result, the swivel range of the swivel base can be set to be larger than 360 °, and the size of the overlapping portion can be arbitrarily secured. Therefore, the operation of facing the boom provided on the swivel base to the target work position can be performed. This can be easily performed in a short time.

[Brief description of the drawings]

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

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

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. 1;

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

FIG. 7 is a sectional view taken along line VII-VII of FIG. 6;

FIG. 8 is a hydraulic circuit diagram of an aerial work vehicle.

FIG. 9 is an electric circuit diagram of an aerial work vehicle.

[Description of Signs] 1 gantry 2 hydraulic motor (drive source) 4 revolving base 6 boom 39 turning angle detecting means 41 slave sprocket 42 main sprocket 43 chain 46 first turning end detection limit switch (detector) 47 second turning end detection Limit switch (detector) 48 Dog (detection member) V Work vehicle

Continuation of the front page (72) Inventor Katsuya Yanagisawa Nippon Telegraph and Telephone Corporation, 1-6-1, Uchisaiwai-cho, Chiyoda-ku, Tokyo (56) References JP-A-50-86058 (JP, A) (JP, U) Japanese Utility Model Showa 58-111257 (JP, U) Japanese Utility Model Showa 62-23297 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A turntable (4) having an up-and-down boom (6) and rotatably supported by a mount (1) of a working vehicle (V), and driving the turntable (4). Drive source (2)
Turning angle detecting means (39) for detecting the turning angle of the turntable (4) to control the driving of the drive source (2).
In the turning restricting device for a boom device, the turning angle detecting means (39) includes a main sprocket (42) provided on the turning table (4) side and a slave sprocket (41) provided on the gantry (1) side. ) And both sprockets (41, 4)
2) The chain (43) wound between the chain and this chain (4)
The detection member (48) provided in 3) and the detection member (4)
8) A turning control device for a boom device, comprising a detector (46, 47) operated by 8).