JP4880280B2 - Work vehicle safety device - Google Patents

Description

  The present invention relates to a safety device for a work vehicle.

  As an example of this type of work vehicle, an aerial work vehicle A as illustrated in FIG. 2 will be described. The aerial work vehicle A is provided with outrigger devices 2 on the front, rear, left and right sides of the vehicle 1, respectively. The outrigger device 2 includes a slide 3 projecting laterally from the vehicle 1 and a jack 4 attached to the tip of the slide 3. The slide 3 includes an outer cylinder 3a fixed to the vehicle 1, an inner cylinder 3b fitted inside the outer cylinder 3a, and a hydraulic cylinder 3c (not shown) disposed between the outer cylinder 3a and the inner cylinder 3b. By extending and retracting the cylinder 3c, the inner cylinder 3b can be extended or stored from the outer cylinder 3a.

  The jack 4 includes an outer box 4a attached to the tip of the slide 3, an inner box 4b (not shown) fitted in the outer box 4a, a ground plate 4c attached to the lower end of the inner box 4b, and an outer box 4a. And a hydraulic cylinder 4d (not shown) disposed between the inner box 4b, and by extending the hydraulic cylinder 4d, the grounding plate 4c is grounded to the ground to support the vehicle 1 and is reduced in size in the outer box 4a. The inner box 4b is stored.

  A swivel base 6 is disposed on the vehicle 1 so as to be able to be swiveled by a swivel drive device 5 (not shown). The telescopic boom 7 includes a base boom 7a, a first intermediate boom 7b, a second intermediate boom 7c, and a tip boom 7d. The base boom 7a is a first intermediate boom 7b, the first intermediate boom 7b is a second intermediate boom 7c, The first boom 7d is inserted into the second intermediate boom 7c in such a manner that it can be extended and retracted sequentially. Appropriate telescopic drive means (not shown) such as a hydraulic cylinder is disposed between the booms, and the telescopic boom 7 is configured to be telescopically driven by the telescopic drive means so that its length can be changed. A hoisting hydraulic cylinder 8 is arranged between the base boom 7a of the telescopic boom 7 and the swivel 6 so that the telescopic boom 7 can be driven to hoist.

  A work table 9 is arranged at the distal end of the telescopic boom 7 so as to be swingable (can be driven to rotate relative to the distal end of the telescopic boom 7). A boom storage platform 10 for storing and supporting the telescopic boom 7 is disposed on the vehicle 1. After the telescopic boom 7 is fully reduced and the swivel base 6 is turned so that the telescopic boom 7 is directed forward, the telescopic boom 7 is expanded and contracted. The boom 7 is laid down and stored in the boom storage platform 10 so that the aerial work platform A is in a traveling state.

By the way, such an aerial work vehicle A includes the following safety device. That is, the storage state detecting means for detecting that the telescopic boom 7 is stored in the boom storage platform 10 and the jack grounding detecting means for detecting the grounding of the grounding plate 4c of each jack 4 in each outrigger device 2 are arranged. If each jack grounding detection means does not detect grounding, the driving means for raising and lowering the telescopic boom 7, extending and contracting, and turning the swivel base 6 (hereinafter referred to as turning of the telescopic boom 7) cannot be driven, and the telescopic boom 7 If the retracted state detecting means does not detect the retracted state of the telescopic boom, the outrigger device 2 cannot be driven. Therefore, when the aerial work vehicle A is set to the traveling state, the telescopic boom 7 is always stored in the boom storage platform 10 and then the jack 4 of the outrigger device 2 is stored. (For example, refer to Patent Document 1.)
Japanese Utility Model Publication No. 1-1118998 (2nd page, FIG. 2)

  However, after the telescopic boom 7 is stored in the boom storage platform 10, the jack 4 of the outrigger device 2 is stored to put the work vehicle A in a traveling state, but the telescopic boom 7 is actually installed in the boom storage platform. 10 may be in a running state without being completely stored. That is, although the telescopic boom 7 is stored in the boom storage platform 10 but is not completely stored, the telescopic boom 7 vibrates up and down slightly on the boom storage platform 10 during traveling. Abnormal noise may be generated. In this case, since the jack 4 of the outrigger device 2 can be stored, the storage state detecting means detects the storage state of the telescopic boom 7, and by this detection, the operator moves the telescopic boom 7 to the boom storage platform 10. It is recognized as being stored in. However, although the storage state detection means detects that the telescopic boom 7 is stored in the boom storage platform 10, this detection means also has a detection error, and the telescopic boom 7 is completely stored in the boom storage platform 10. If this is detected, an expensive detection means must be employed, resulting in an increase in cost.

  In addition, if the telescopic boom is retracted without being fully reduced during traveling, it may be a dangerous traveling condition by projecting the boom from the vehicle width or increasing the overall height, which may make the work vehicle dangerous. It was to run in the state.

  An object of this invention is to provide the safety device of the work vehicle which solved such a subject.

  In order to achieve the above object, a safety device for a work vehicle according to claim 1 of the present invention includes a jack that is disposed on the front, rear, left, and right sides of the vehicle and that supports the vehicle by grounding the tip portion to the ground in an overhanging state. A working vehicle having a telescopic boom that can be raised and lowered and is stored in a retracted position, wherein the jack is operated based on the operation of the retracted state detecting means for detecting the retracted state of the telescopic boom and the jack operating means. A jack control means to be operated, a hoisting control means for raising and lowering the telescopic boom based on an operation of the hoisting operation means for the telescopic boom, a jack reduction operation detecting means for detecting at least a jack shrinking operation of the jack operating means, and a controller. And the controller causes the telescopic boom to lie down when receiving signals from the retracted state detecting means and the jack reduction operation detecting means. Cormorant is characterized in that it has configured to output a control signal to the relief control means.

  According to a second aspect of the present invention, there is provided the safety device for a work vehicle according to the first aspect, further comprising expansion / contraction control means for extending / contracting the expansion / contraction boom based on an operation of the expansion / contraction operation means for the expansion / contraction boom. When a signal from the jack reduction operation detecting means is received, a control signal is output to the extension control means so as to reduce the extension boom.

  In the work vehicle safety device according to the first aspect of the present invention, when the telescopic boom is retracted and the jack is contracted, the controller receives the signals from the retracted state detecting means and the jack contracting operation detecting means, and collapses the telescopic boom. Since the control signal is output to the undulation control means, even if the telescopic boom is not completely stored, the telescopic boom can be laid down and completely stored together with the jack reduction operation. Therefore, it is possible to completely store the telescopic boom even when an error occurs in the storage detection by using an inexpensive storage state detecting means, and the telescopic boom is slightly lifted up and down on the boom storage platform during traveling. It is possible to prevent the generation of abnormal noise due to vibration.

  In the work vehicle safety device according to the second aspect of the present invention, when the telescopic boom is retracted and the jack is contracted, the controller expands and contracts when receiving signals from the retracted state detecting means and the jack contracting operation detecting means. Since the control signal is output to the telescopic control means so as to reduce the boom, the telescopic boom can be contracted together with the operation of reducing the jack, and the telescopic boom can be fully retracted and stored even if the telescopic boom is not fully contracted. Can do. Therefore, if the telescopic boom is stretched without being completely reduced during traveling, the boom is protruded from the vehicle width or the overall height is increased to prevent the work vehicle from entering a dangerous traveling state. be able to.

  Embodiments of a work vehicle safety device according to the present invention will be described below. An example of the aerial work vehicle A shown in FIG. 2 and described in the prior art will be described below. Therefore, it is assumed that the reference numerals described in the related art are the same, and the same reference numerals are used in the following description, and detailed description is omitted. FIG. 1 is an explanatory view illustrating a work vehicle safety device according to the present invention.

  In FIG. 1, reference numeral 20 denotes a telescopic boom operation unit, a hoisting operation unit 20 a for hoisting the telescopic boom 7, an telescopic operation unit 20 b for telescopic operation of the telescopic boom 7, and a swing operation for swinging the telescopic boom 7. It is comprised with the means 20c. Reference numeral 21 denotes an outrigger device operating means for operating the outrigger device 2, a jack reducing operation means 22 a for reducing the jack 4, a jack extending operation means 22 b for extending the jack 4, and a slide for reducing the slide 3. The reduction operation means 23a and the slide extension operation means 23b for extending the slide 3 are configured.

  Reference numeral 19 denotes a jack reduction operation detection means for detecting that the jack reduction operation means 22a has been operated. Reference numeral 24 denotes storage state detection means for detecting that the telescopic boom 7 is stored in the boom storage platform 10, and is constituted by a switch attached to the boom storage platform 10.

  A telescopic boom control unit 30 is a hoisting control unit 30a that controls the hoisting hydraulic cylinder 8 that drives the hoisting boom 7 to move up and down, and an hoisting control unit that controls the telescopic driving unit that drives the telescopic boom 7 to extend and contract. 30b and a turning control means 30c for controlling the turning driving means for turning the telescopic boom 7 to turn. The hoisting control means 30a is a means for raising or lowering the telescopic boom 7 by extending or reducing the hoisting hydraulic cylinder 8 in response to the hoisting control signal. The expansion / contraction control means 30b is a means for receiving an expansion / contraction control signal to expand or contract the expansion / contraction drive means and extend or contract the expansion boom 7. The turning control means 30c is means for receiving the turning control signal and rotating the turning drive device 5 clockwise or counterclockwise to turn the telescopic boom 7 clockwise or counterclockwise.

  Reference numeral 31 denotes an outrigger device control means which is controlled based on the operation of the outrigger device operation means 21 and comprises a jack control means 32 and a slide control means 33. The jack control means 32 extends the hydraulic cylinder 4 d in response to the jack control signal, and extends the inner box 4 b from the outer box 4 a of the jack 4. Then, the ground plate 4c is grounded to the ground to support the vehicle 1. In response to the jack control signal, the hydraulic cylinder 4 d is contracted to store the inner box 4 b in the outer box 4 a of the jack 4. In response to the slide control signal, the slide control means 33 extends the hydraulic cylinder 3 c and extends the inner cylinder 3 b from the outer cylinder 3 a of the slide 3. The jack 4 is extended to the side of the vehicle 1. In response to the slide control signal, the hydraulic cylinder 3 c is contracted to store the inner cylinder 3 b in the outer cylinder 3 a of the slide 3.

  Reference numeral 27 denotes a controller having the following functions. The controller 27 receives an operation signal from the telescopic boom operation means 20 and outputs a control signal for controlling the telescopic boom control means 30 based on the operation signal. That is, the controller 27 receives an operation signal from the hoisting operation means 20a, and outputs a control signal for raising or lowering the telescopic boom 7 to the hoisting control means 30a based on the operation signal. Similarly, the controller 27 receives the operation signal of the expansion / contraction operation means 20b, and outputs a control signal for extending or contracting the expansion / contraction boom 7 to the expansion / contraction control means 30b based on the operation signal. Then, the controller 27 receives an operation signal from the turning operation means 20c, and outputs a control signal for turning the telescopic boom 7 to the right or turning to the turning control means 30c based on the operation signal.

  Further, the controller 27 receives an operation signal from the outrigger device operating means 21 and outputs a control signal for controlling the outrigger device control means 31 based on the operation signal. That is, the controller 27 receives an operation signal from the jack reduction operation means 22a, and outputs a control signal for reducing the jack 4 to the jack control means 32 based on the operation signal. Similarly, the controller 27 receives an operation signal from the jack extension operation means 22b, and outputs a control signal for extending the jack 4 to the jack control means 32 based on the operation signal. The controller 27 receives an operation signal from the slide reduction operation means 23a, and outputs a control signal for reducing the slide 3 to the slide control means 33 based on the operation signal. Similarly, the controller 27 receives an operation signal from the slide extension operation unit 23b, and outputs a control signal for extending the slide 3 to the slide control unit 33 based on the operation signal.

  Further, the controller 27 restricts the output of the control signal based on the operation signal from the outrigger device operation means 21 to the outrigger device control means 31 when it does not receive the detection signal from the storage state detection means 24. . That is, unless the telescopic boom 7 is stored in the boom storage platform 10, the slide 3 and jack 4 of the outrigger device 2 cannot be operated.

  Further, when the controller 27 receives signals from the storage state detection means 24 and the jack reduction operation detection means 19, the controller 27 outputs a control signal to the undulation control means 30a so as to cause the telescopic boom 7 to fall down.

  In the safety device for a work vehicle according to the present invention configured as described above, when the telescopic boom 7 is in the retracted state and the jack 4 is contracted, the controller 27 receives signals from the retracted state detecting means 24 and the jack contracting operation detecting means 19. Since the control signal is output to the raising / lowering control means 30a so as to cause the receiving telescopic boom 7 to fall down, the telescopic boom 7 is completely lowered by the reduction operation of the jack 4 even if the telescopic boom 7 is not completely stored. Can be stored. Therefore, it is possible to completely store the telescopic boom 7 even if an inexpensive storage state detecting means 24 is employed and an error occurs in the storage detection.

  Further, the controller 27 outputs a control signal to the expansion / contraction control means 30b so as to reduce the telescopic boom 7 when receiving signals from the storage state detection means 24 and the jack reduction operation detection means 19.

  Therefore, when the telescopic boom 7 is placed in the retracted state and the jack 4 is contracted, the controller 27 receives signals from the retracted state detecting means 24 and the jack contracting operation detecting means 19 to cause the telescopic control means 30b to contract the telescopic boom 7. Since the control signal is output, even if the telescopic boom 7 is not completely contracted, the telescopic boom 7 can be contracted together with the reduction operation of the jack 4 and the telescopic boom 7 can be completely contracted and stored. Therefore, if the telescopic boom 7 is unintentionally extended without being completely reduced during traveling, the work vehicle becomes in a dangerous traveling state by projecting the telescopic boom 7 from the vehicle width or increasing the overall height. Can be prevented.

  Also in the work vehicle safety device of the present invention, jack ground detection means (not shown) for detecting the ground contact of the ground plate 4c of the jack 4 in the outrigger device 2 is arranged in each jack 4 and each jack ground detection means. Of course, if the grounding is not detected, the undulation control means 30a, the extension control means 30b, and the turning control means 30c of the extension boom control means 30 of the extension boom 7 cannot be driven.

  When the extension boom 7 is fallen down and the extension boom 7 is reduced together with the jack reduction operation in the above embodiment, the operation can be specifically performed as follows. That is, when the telescopic boom 7 is in the retracted state and the jack 4 is contracted, the controller 27 receives signals from the retracted state detecting means 24 and the jack contracting operation detecting means 19 and expands and contracts for a predetermined time before the jack 4 is contracted. A control signal may be output to the hoisting control means 30a so as to cause the boom 7 to fall down, and a control signal may be output to the telescopic control means 30b so as to contract the telescopic boom 7, and then the jack 4 may be contracted. When the telescopic boom 7 is in the retracted state and the jack 4 is contracted, the controller 27 receives signals from the retracted state detecting means 24 and the jack contracting operation detecting means 19, and the telescopic boom is contracted for a predetermined time while the jack 4 is contracted. A control signal may be output to the hoisting control means 30a so as to incline 7 and a control signal may be output to the telescopic control means 30b so as to reduce the telescopic boom 7.

  In the above-described embodiment, the telescopic boom 7 is laid down and contracted for a predetermined time. The upper pressure is detected, and the detection of each pressure is input to the controller 27. The controller 27 receives the detection signal of each pressure and controls the telescopic boom 7 to fall down or contract until it detects a predetermined pressure increase. It may be the one.

  Further, an undulation angle detection means for detecting the undulation angle of the telescopic boom 7 is arranged, the detection means detects the total depression angle of the telescopic boom 7, and the telescopic length detection means 26 detects the total contraction of the telescopic boom 7. Then, each detection signal is input to the controller 27, and the controller 27 receives the signal of each detection means, and controls so that the telescopic boom 7 is tilted or reduced until the respective detection means detects the full depression angle and the full reduction. It may be the one.

  In the above embodiment, when the telescopic boom 7 is retracted and the jack 4 is contracted, the controller 27 causes the telescopic boom 7 to fall down and the telescopic boom 7 to contract. However, the telescopic boom 7 only falls down. Of course, it may be.

  Next, a development example of the above embodiment will be described below. That is, in the above-described embodiment, when the expansion boom 7 is placed in the retracted state and the jack 4 is contracted, the controller 27 receives signals from the retracted state detecting means 24 and the jack contracting operation detecting means 19 so that the telescopic boom 7 falls down. Since the control signal is output to the undulation control means 30a, the telescopic boom 7 can be completely lowered and retracted together with the reduction operation of the jack 4 even if the telescopic boom 7 is not completely stored. Is.

  However, if the storage state detection means 24 fails and the telescopic boom 7 is not stored in the boom storage platform 10 but is detected in the storage state, the controller 27 is operated when the jack 4 is contracted. Since the telescopic boom 7 is laid down with the jack 4 being reduced, the telescopic boom 7 is laid down at a position disengaged from the boom storage platform 10 when the jack 4 is reduced. There is a possibility that it may interfere with an object or the like that is close to the object, which may be a dangerous operation.

  Therefore, as shown in FIG. 1, the turning angle detecting means 25 for detecting that the telescopic boom 7 is located within a predetermined turning range stored in the boom storage platform 10 and the telescopic boom 7 are fully reduced. In addition to the signals from the storage state detection means 24 and the jack reduction operation detection means 19, the controller 27 detects the turning angle detection means 25 and the extension length detection. If the signal from the means 26 is not received, the telescopic boom 7 may not be laid down together with the reduction operation of the jack 4.

  In this way, even when the storage state detecting means 24 breaks down and the telescopic boom 7 is not stored in the boom storage platform 10, the controller 27 detects the storage state. When the telescopic boom 7 is not located at the swivel position within the predetermined swivel range, or when the telescopic boom 7 is not fully contracted, the telescopic boom 7 is not laid down together with the reduction operation of the jack 4. Therefore, a dangerous operation that interferes with the cab of the vehicle 1 or an object in the vicinity of the vehicle 1 can be prevented.

  In the above-described embodiment, the case where the turning angle detection unit 25 and the expansion / contraction length detection unit 26 are added has been described, but it is needless to say that only one of them may be added.

  In the above embodiment, the storage state detection means 24 is configured by a switch attached to the boom storage platform 10 and detects that the telescopic boom 7 has been stored in the boom storage platform 10. The retracted state detector 24 (not shown) for detecting the lift angle of the boom 7 and the turning angle detector 25 described above may constitute the retracted state detector 24. That is, the telescopic boom 7 is raised and lowered within a predetermined hoisting angle range in which it is determined that the telescopic boom 7 is stored in the boom storage platform 10, and the swing angle of the telescopic boom 7 detected by the swing angle detecting means 25 is the telescopic boom. 7 is determined to be in the retracted state when the telescopic boom 7 is swung within a predetermined swivel angle range that is determined to be stored in the boom storage platform 10. It may be.

  In the above embodiment, the operation signal from each operation means is output to the control means via the controller 27 for control, but each control means can be directly operated by the operation from each operation means. Of course, it can be implemented in the same manner.

  Moreover, in the said embodiment, although the slide 3 and the jack 4 were provided as the outrigger apparatus 2, and it extended so that the jack 4 might be extended to the side of the vehicle 1, it arrange | positions only the jack 4 without arrange | positioning the slide 3. Of course, the present invention can be similarly implemented even when the vehicle 1 is supported by being grounded on the spot.

  Furthermore, although the said embodiment demonstrated the case where it applied to an aerial work vehicle as a work vehicle, it cannot be overemphasized that it is applicable to work vehicles, such as a mobile crane vehicle and a digging pillar car.

It is explanatory drawing explaining the safety device of the working vehicle which concerns on this invention. It is explanatory drawing explaining an aerial work vehicle as a work vehicle.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle 4 Jack 7 Telescopic boom 19 Jack contraction operation detection means 24 Storage state detection means 27 Controller 32 Jack control means 20a Unfolding operation means 20b Extension operation means 22a Jack contraction operation means 30a Unfolding control means 30b Expansion control means

Claims (2)

A working vehicle including a jack that is disposed on the front, rear, left, and right of a vehicle and that supports the vehicle with a tip portion grounded to the ground in an overhanging state, and an extendable boom that is disposed on the vehicle so as to be undulated and stored in a storage position. A retracted state detecting means for detecting a retracted state of the telescopic boom; a jack control means for operating the jack based on an operation of the jack operating means; and a hoisting control means for operating the telescopic boom to be raised and lowered based on an operation of the hoisting operation means of the telescopic boom. And a jack reduction operation detecting means for detecting at least a jack reduction operation of the jack operation means, and a controller, and when the controller receives signals from the storage state detection means and the jack reduction operation detection means, the telescopic boom It is configured to output a control signal to the undulation control means so as to lie down. Apparatus. 2. The telescopic boom according to claim 1, further comprising telescopic control means for extending and retracting the telescopic boom based on the operation of the telescopic operating means of the telescopic boom, wherein the controller expands and contracts when receiving signals from the retracted state detecting means and the jack reduction operation detecting means. A safety device for a work vehicle configured to output a control signal to an expansion / contraction control means so as to reduce a boom.

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