JPH0738319Y2 - Work vehicle operating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an operating device for a work vehicle.

(Prior Art) A conventional operating device for a work vehicle of this type will be described below by taking an aerial work vehicle illustrated in FIGS. 5 and 6 as an example. In FIG. 5, a conventional operating device for a work vehicle of this type used for a work vehicle at a high position has a swivel base 2 rotatably mounted on a vehicle 1 and a base end portion of the swivel base 2. A boom 4 which is pivotally supported by a hoisting cylinder 3 and can be hoisted freely.
A telescopic boom (hereinafter referred to as a telescopic boom) is arranged, and a bucket 5 for mounting a worker is provided at the tip of the telescopic boom 4. Then, the telescopic boom 4 has a base boom 6 and an intermediate boom 7 attached thereto.
The front boom 8 is sequentially inserted into the intermediate boom 7 so that the boom 8 can freely expand and contract, and an appropriate expansion and contraction driving means is arranged between the booms.
The conventional operating device for a work vehicle thus configured has the following configuration when operated from above the bucket 5. That is, an operation unit 10 having an operation lever 9 that is operated by an operator to operate the work vehicle at high places is arranged on the bucket 5, and a signal from the operation unit 10 is transmitted to the vehicle 1 by radio waves. The transmitter 11 and the transmitting antenna 12 are arranged at appropriate positions on the bucket 5. The operating lever 9 is composed of a plurality of operating levers sufficient to drive the aerial work vehicle (that is, the telescopic boom 4 is allowed to extend, retract, swing, etc.), and signals from the plurality of operating levers are transmitted via the operation unit 10. The machine 11 can superimpose it on a radio wave of one frequency and transmit it from the transmission antenna 12. On the other hand, on the vehicle 1, a receiving antenna 13 that receives a radio wave from the transmitting antenna 12, a transmitter 14 that receives the radio wave received by the receiving antenna 13, and a work platform for aerial work by receiving a signal from the receiver 14 are provided. A control unit (including a hydraulic control device) 15 for drive control is provided. The control unit 15 is composed of a plurality of control units sufficient to drive the aerial work vehicle (that is, the telescopic boom 4 is telescopic, undulating, turning, etc.), and superimposes a signal sent on a radio wave of one frequency, The receiver 14 distributes it to each control unit 15 to control each drive means of the aerial work vehicle. As described above, the conventional operating device for a work vehicle used for an aerial work vehicle transmits a signal from the operating unit 10 to the control unit 15 via radio waves to operate the aerial work vehicle. . Further, as shown in FIG. 6, in the case of an aerial work vehicle in which a control unit (comprising a hydraulic control device etc.) 15 for driving and controlling the aerial work vehicle is arranged on the swivel base 2, the receiving antenna 13 and the receiver are provided. 14 is arranged on the swivel base 2, and similarly, a signal from the operation unit 10 is transmitted to the control unit 15 via radio waves to operate the aerial work vehicle.

As described above, the conventional operating device for a work vehicle used for an aerial work vehicle has a control unit that transmits a signal from the operation unit 10 via radio waves.
The telescopic boom 4 can be telescopically moved and the swivel base 2 can be swung (the aerial work vehicle according to FIG. 6 is only the telescopic boom 4 to be telescopically moved) in consideration of the movable parts, as compared with the case of directly transmitting by wire. It has the advantage of not having to. That is, in order to directly transmit the transmission of the operation signal between the operation unit 10 and the control unit 15, the signal transmission cable wound around the cable reel between the operation unit 10 side and the control unit 15 side, the cable reel It must be directly connected via the rotary joint and the rotary joint between the swivel base 2 and the vehicle 1. In this case, there is a problem that signal transmission becomes uncertain due to poor contact in the rotary joint portion in the previous period. This problem has been a particularly serious problem when the operation signal is transmitted by multiplex transmission.

Therefore, in the conventional operating device for an aerial work vehicle, the telescopic boom 4 is extended and retracted and the swivel base 2 is swung (the aerial work vehicle according to FIG. The operation signal is transmitted by radio waves to eliminate the interposition of the rotary joint in the signal transmission system.

(Problems to be solved by the invention) However, although the conventional operation device configured as described above can eliminate the uncertainty of the operation signal transmission due to poor contact by eliminating the interposition of the rotary joint, the output from the transmitter 11 There is a problem that the signal from the transmitter 11 cannot be reliably received by the receiver 14 because the generated radio wave is a weak radio wave limited by the Radio Law. In particular, when the telescopic boom 4 is maximally extended, or when the intermediate boom 7 of the telescopic boom 4 is composed of a plurality of stages to make the telescopic boom 4 long and the transmitting antenna 12 and the receiving antenna 13 are considerably separated, Depending on the site, the above problem occurs when a shield exists between the bucket 5 and the vehicle 1 (or the swivel base 2) (that is, between the transmitting antenna 12 and the receiving antenna 13).

An object of the present invention is to provide a novel operating device for an aerial work vehicle that solves the above problems.

(Means for Solving the Problems) In order to achieve the above object, the operating device for an aerial work vehicle of the present invention is a boom having at least one telescopic section on a swivel mounted rotatably on the vehicle. Is installed so that it can be lifted up and down, and an operation part for operating the work vehicle is arranged near the boom tip side or below the boom tip side. From this operation part, a hydraulic control is provided on the swivel base or on the vehicle to control the drive of the work vehicle. An operating device for a work vehicle configured to remotely operate the device, wherein an operating signal of the operating unit is transmitted as a radio signal via a transmission antenna connected to the operating unit side, and the radio signal is transmitted by the hydraulic pressure. In the configuration configured to receive by a receiving antenna connected to the control device side, the transmitting antenna is on a boom or a swivel on which at least one telescopic section is interposed with respect to the boom tip side. The cable reel is rotatably attached to the position, and is connected and attached to the end of the winding side of the cable wound on the cable reel without interposing a rotary joint, and the operation is performed via the cable. It is characterized in that it is connected to the section.

(Operation) According to the above configuration, the transmission antenna connected to the operation unit side is attached to a position on the boom or swivel base such that at least one telescopic section is interposed with respect to the boom tip side, and the transmission antenna and the reception antenna are connected. Since the distance can be made as short as possible, the operation signal can be reliably transmitted even if the output is limited by the Radio Law and only a weak electric wave is transmitted from the transmitting antenna. Further, it is possible to reduce the possibility that a shield that shields radio waves will enter between the transmitting antenna and the receiving antenna during work. Moreover, since the operation unit and the transmitting antenna are connected without a rotary joint, there is no problem associated with poor contact of the rotary joint.

(Embodiment) The first embodiment of the operating device for a work vehicle according to the present invention will be described below.
Shown in FIGS. 4-4 and described below. Further, a case where it is applied to an aerial work vehicle described in the related art will be described. In addition, reference numerals 1 to 11 and reference numerals shown in FIGS. 1 to 4
Reference numerals 13 to 15 are the same as those shown in FIGS. 5 and 6 and described in the related art, and therefore, the same reference numerals are used in the following description and the description thereof is omitted. In FIGS. 1 and 2, reference numeral 16 denotes a cable reel attached to the base end side of the telescopic boom 4 (base end side of the base boom 6), which is a shaft 17 and a shaft 17
A spring that constantly biases the drum 18 that rotates with it and the coaxial cable 20 that is wound around the drum 18 in the winding direction.
Equipped with 19. Reference numeral 21 is a transmitting antenna, which is directly connected to one end of a coaxial cable 20 mounted on the shaft 17 of the cable reel 16 and wound around a drum 18. Therefore, a slip ring, a brush, etc. are arranged on the cable reel 16, and the coaxial cable 20 and the transmitting antenna 21 are arranged through this.
Since it is not connected, it is possible to easily connect without having to consider the impedance matching of the antenna. Since the transmitting antenna 21 shown in FIG. 2 is mounted orthogonal to the shaft 17, the transmitting antenna 21 rotates as the drum 18 rotates.
The direction of changes. When the directional characteristics of the antenna affect the change of the direction, the transmitting antenna 21 may be attached in the same direction as the shaft 17. By doing so, the transmitting antenna 21 rotates, but its direction does not change, so that the influence of the directional characteristics can be eliminated. The coaxial cable 20 wound around the drum 18 is pulled out from the cable reel 16 and locked at the tip of the tip boom 8, and then the bucket 5
It is connected to the output stage of the upper transmitter 11.

The operating device for a working vehicle according to the present invention constructed as above operates as follows. When an operator who rides on the bucket 5 operates the operation lever 9,
A signal from 10 is transmitted through a coaxial cable 20 via a transmitter 11 and is transmitted from a transmitting antenna 21 attached to a cable reel 16. The transmission antenna 21 is arranged on the base end side of the telescopic boom 4 (base end side of the base boom 6), and
It is located at a position close to the receiving antenna 13 even if it is expanded, contracted, undulated, and rotated. Moreover, the transmitting antenna 21 and the receiving antenna 13 arranged on the base end side of the telescopic boom 4 are located close to each other on the same vehicle 1 and no shield is provided therebetween. Therefore, the radio wave transmitted from the transmission antenna 12 is transmitted to the reception antenna 13 in a strong electric field, and is surely received by the receiver 14, and the signal from the operation unit 10 is transmitted to the control unit 15. In this way, the operating device for a work vehicle of the present invention ensures that the signal from the operating unit 10 is transmitted to the control unit 15 so that the work vehicle for high places can be operated.

Although the cable reel 16 is attached to the base end side of the telescopic boom 4 (base end side of the base boom 6) in the above embodiment, the transmitter 11
If the radio wave transmitted from the receiver 14 can be reliably received by the receiver 14, it may be attached to the tip of the intermediate boom 7. Also, a two-stage telescopic boom having only one telescopic section can be implemented in synchronization. Further, when it is attached to a telescopic boom having a plurality of intermediate booms, as long as the radio wave transmitted from the transmitter 11 can be reliably received by the receiver 14, the intermediate boom or the base boom in which two or more telescopic sections are interposed is present. May be attached to. Further, as shown by a chain line in FIG. 1, the cable reel 16 is mounted on the swivel base 2, and the coaxial cable 20 pulled out from the cable reel 16 is passed through a pulley provided at the base end portion of the base boom 6 and the front boom 8 is moved. After locking to the transmitter
You may make it connect to 11.

Although the receiving antenna 13 is arranged behind the vehicle 1 in the above embodiment, the receiving antenna 22 (shown by a broken line in FIG. 1) is also arranged in front of the vehicle 1 (on the driver's seat of the vehicle 1). When receiving a radio wave from the antenna, the antenna that is strongly sensed by the receiver 14 may be selected and received, or both antennas may be received. In this case, even if the swivel base 2 is swung, either of both antennas is close to the transmission antenna 21, so that the distance between the two antennas should be made smaller than in the above embodiment. You can

Further, even in the case of an aerial work vehicle having a control unit (comprising a hydraulic control device, etc.) 15 for driving and controlling the aerial work vehicle as shown in FIG. ,
Place the receiving antenna 13 and the receiver 14 on the swivel base 2,
Of course, the same can be done.

Further, in the above embodiment, the operation unit 10 is arranged in the bucket 5 and the control unit 15 is arranged on the vehicle 1 so that the signal is transmitted from the bucket 5 side to the vehicle 1 side.
It is also possible to dispose the control unit 15 and the operation unit 10 on the vehicle 1 to transmit a signal from the vehicle 1 side to the bucket 5 side. It is also possible to provide an operation unit and a control unit on both the bucket 5 side and the vehicle 1 side, and transmit signals from both sides.

Next, regarding the development example of the operating device for the work vehicle according to the present invention,
The case of implementation in the aerial work vehicle shown in FIG. 3 will be described below. The aerial work vehicle shown in FIG. 3 is a foldable aerial work vehicle in which another telescopic boom 23 is arranged between the telescopic boom 4 and the swivel base 2 as compared with the aerial work vehicle shown and described in FIG. Is. That is, in this foldable aerial work vehicle, a telescopic boom 23, which is pivotally supported at its base end portion by a swivel base 2 and can be raised and lowered by a hoisting cylinder 3, is arranged at the tip of the telescopic boom 23 to which the telescopic boom 4 is linked 27. The undulating cylinder 28 is arranged so that it can be undulated. The telescopic boom 23 includes a base boom 24, an intermediate boom 25, and an intermediate boom 25, a front boom 26.
Are sequentially telescopically inserted, and an appropriate telescopic drive means is arranged between the booms. Also in the folding aerial work vehicle configured as described above, the transmitting antenna 21 is attached to the base boom 24 of the telescopic boom 23 as shown in FIG. 3, and the coaxial cable 20 pulled out from the cable reel 16 is attached to the telescopic boom. The pulleys 29, 30 respectively arranged at the base end of the telescopic boom 4 and the tip of the telescopic boom 23 are passed to engage with the tip boom 8 of the telescopic boom 4 and then connected to the transmitter 11 on the bucket 5, Similarly, the signal from the operation unit 10 can be reliably transmitted to the control unit 15. In particular, in such a folding aerial work vehicle, a shield is often present between the bucket 5 and the vehicle 1 (between the bucket 5 and the swivel base 2 when the control unit 15 is on the swivel base 2) during work. However, even in such a case, it is possible to reliably transmit the signal from the operation unit 10 to the control unit 15, in the case of the above-described developed example,
Although the cable reel 16 and the transmitting antenna 21 are attached to the base boom 16 of the telescopic boom 23, if the radio wave transmitted from the transmitter 11 can be reliably received by the receiver 14, the cable reel 16 and the transmitting antenna 21 are telescopic. It may be attached to the base boom 6 of the boom 4. In this case, it is not necessary to dispose the pulleys 29 and 30, and the length of the coaxial cable 20 can be shortened, and the cable reel 16 can be downsized by the length of the coaxial cable 20 being shortened.

In the above description, the case where the invention is applied to an aerial work vehicle has been described, but the present invention is not limited to the aerial work vehicle. An embodiment in the case of being applied to a mobile crane as shown in FIG. 4 will be described below. The symbols 1 to 4, the symbols 6 to 8, and the symbols 13 to 1 shown in FIG.
Reference numerals 5, 16 and 20 to 21 are the same as those of the aerial work vehicle shown and described in FIG. 1, and therefore, the same reference numerals are used in the following description and the description thereof is omitted. However, the swivel base 2 and the front boom 8 differ from those shown in FIG. 1 in the following points. That is, a winch 32 around which a wire rope 31 is wound is provided on the swivel base 2. The front boom 8 is not provided with the bucket 5, and pulleys 33, 34 are provided at the tip of the front boom 8. The wire rope 31 fed from the winch 32 is passed around and wound around the pulleys 33 and 34, and the hook 35 is suspended from the tip of the front boom 8. The mobile crane constructed in this way suspends a load on the hook 35,
The telescopic boom 4 is expanded and contracted, raised and lowered, swung, and the winch 32 is hoisted and unwound, and the load is moved to a desired position for work. And this mobile crane can be operated remotely as follows. On the swivel base 2 of the mobile crane, the receiving antenna 13, the receiver 14 and the control unit 15 described in the above embodiment are provided. In the control unit 15,
In order to drive the mobile crane, each hydraulic control device such as expansion / contraction of the telescopic boom 4, undulation and turning, and hoisting / lowering motion of the winch 32 is driven. The cable reel 16 is attached to the base boom 6, and the coaxial cable 20 pulled out from the cable reel 16 is connected to the front boom 8.
It is locked at the tip of. Reference numeral 36 denotes a portable transmitter, which includes an operation unit 39 having the operation lever (here, an operation button) 38 described in the above embodiment, and a transmitter 40. It is possible to remotely drive the mobile crane by carrying and operating this portable transmitter 36, that is, the output from the transmitter 40 of the portable transmitter 36 to the coaxial cable 20 via the coaxial cable 37. It is connected by connecting with a connector. Therefore, the operation signal from the operation unit 39 of the portable transmitter 36 is transmitted as a radio signal from the transmission antenna 21, received by the reception antenna 13, and transmitted to the control unit 15.
It is able to drive mobile cranes. In this case, since the cable reel 16 is attached to the base end portion of the base boom 6, the distance between the receiving antenna 13 and the transmitting antenna 21 can be shortened, and the radio signal transmitted from the transmitting antenna 21 is in a strong electric field. Can be transmitted to the receiving antenna 13, and the receiving antenna 13 can reliably receive even a weak radio wave signal transmitted from the transmitting antenna 21. In this case, even if there is a shield between the vehicle 1 and the tip of the telescopic boom 4, the influence thereof can be eliminated. Thus, the present invention can be applied not only to aerial work vehicles, but also to work vehicles including booms having one or more telescopic sections such as crane trucks.

In each of the above embodiments, the case where the transmitter is arranged on the tip side of the telescopic boom 4 has been described. However, the transmitter is arranged on the cable reel 16 and the coaxial cable 20 is used as a signal from the operation unit 10. May be used as a means for transmitting to the transmitter 11. At this time, the power of the transmitter may be supplied via the coaxial cable 20, and the signal from the operation unit 10 may be superimposed on the power by multiplex transmission and transmitted to the transmitter. Moreover, when transmitting the signal from the operation unit 10 to the transmitter, an optical fiber cable may be used instead of the wired communication.

(Effect of the device) Since the device is configured and operates as described above, the boom is extended while the device is limited by the Radio Law and can only transmit weak radio waves from the transmitting antenna.
A signal from the operation unit can be reliably transmitted to the control unit even if the tip end side of the boom or the vicinity of the lower end side of the boom and the vehicle (the swivel base) are separated from each other or a shield is present therebetween.

[Brief description of drawings]

FIG. 1 is an explanatory view when an operating device for a work vehicle according to the present invention is applied to an aerial work vehicle, and FIG. 2 is an explanatory view of a cable reel used in the operating device for a work vehicle according to the present invention. FIG. 3 is an explanatory view when the operating device for a working vehicle according to the present invention is applied to another aerial work vehicle, and FIG. 4 is a case where the operating device for a working vehicle according to the present invention is applied to a crane vehicle. Illustration of
5 and 6 are explanatory views of a conventional operating device for a work vehicle. 1; vehicle, 2; swivel base, 4; boom, 10; operating part, 13; receiving antenna, 15; hydraulic control device (control part), 16; cable reel, 21; transmitting antenna

Claims (1)

[Scope of utility model registration request] 1. An operating unit for operating a working vehicle near a boom tip side or below the boom tip side with a boom having at least one telescopic section attached to a swivel base rotatably mounted on a vehicle. And a hydraulic control device for controlling the drive of the work vehicle, which is provided on the swivel base or on the vehicle from the operation unit, and is configured to remotely operate the work vehicle. The operation signal of is transmitted as a radio wave signal via a transmission antenna connected to the operation section side, and the radio wave signal is received by a reception antenna connected to the hydraulic control device side. On a cable reel rotatably mounted at a position on the boom or swivel such that at least one telescopic section is interposed between the cable reel and the cable reel. Has been attached are connected without interposing the rotary joint in the winding end of the cables, work vehicle operating device, characterized in that connected to the operating unit via the cable.