JP2017177904A - Brake equipment of high-lift work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide brake equipment for high-lift work vehicle capable of enhancing work efficiency by reducing the workload for actuating an auxiliary brake means.SOLUTION: Brake equipment comprises: a brake pedal 71 capable of being operated by stepping down; a master cylinder 73 generating a brake actuation force by actuating in response to a stepping-down operation of the brake pedal 71; the brakes 74, 75 braking the tire wheels 3 by the brake actuation force; and auxiliary working brake equipment 80 retaining the braking state of the tire wheels 3 by retaining the brake actuation force. When a brake lock-resetting switch 92 provided on a work bench is operated, the master cylinder 73 and auxiliary working brake equipment 80 are actuated in addition to the step-down operation of a brake pedal 71 to retain the braking state of the tire wheels 3 by the brakes 74, 75.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a braking device for an aerial work vehicle including auxiliary braking means for maintaining a braking state of a traveling device.

  An aerial work vehicle includes, for example, a vehicle body having front and rear wheels that can travel, a boom disposed on the vehicle body so as to be able to undulate, extend, retract, and turn, and an operator boarding provided at the tip of the boom. The work table is configured to be freely movable to any high position by operating a boom by operating an operating device provided on the work table. It is a vehicle. In such an aerial work platform, the position of the center of gravity is raised by moving the boom up and down to position the work platform at a high location, so that the ground can be grounded to maintain a stable work posture during work. A plurality of jacks for lifting and supporting the vehicle body are provided.

  By the way, an aerial work vehicle may be used even on a sloping ground. For this reason, in addition to the normal wheel brake that brakes the front and rear wheels with the brake pedal depressed, and the parking brake that holds the rear wheels in the braking state when the parking brake lever is operated, A work-auxiliary braking device that keeps the front and rear wheels in a braking state even if the brake pedal is stopped afterwards by operating a specified operation switch while the brake pedal is depressed, thereby preventing the vehicle from running away on a slope. (Brake lock device) is attached (for example, refer patent document 1). As a result, when working on an inclined ground using an aerial work platform, the jack should be applied with the parking brake applied and the work auxiliary brake device activated to maintain the braking state for the front and rear wheels. The overhanging operation and the storing operation are performed.

JP 2005-324671 A

  Here, when the work auxiliary braking device is continuously used for a long time, the air pressure for maintaining the brake pedal depressed is lowered with time, and a large load is applied to the components, and the configuration is increased. It can cause deterioration of parts (mainly rubber parts) and reduce braking force. Therefore, when a predetermined time has elapsed since the operation auxiliary brake device is operated, an alarm sound is generated toward the surroundings, so that the work auxiliary brake device is continuously used for a predetermined time for the worker. The technology to let you know that is in practical use. Thereby, the worker can continue the work after stopping the auxiliary brake device for work and stopping the alarm sound. However, at the end of the work, it is necessary to re-activate the work auxiliary brake device (with the braking force applied to the front and rear wheels) and perform the jack retraction operation. The operation for operating the auxiliary brake device for work must be performed (especially, getting into the driving cab on a sloping ground is a heavy work burden), resulting in a problem that the work efficiency decreases. It was.

  The present invention has been made in view of such a problem, and provides a braking device for an aerial work vehicle capable of reducing work burden for operating auxiliary braking means and improving work efficiency. With the goal.

  In order to solve the above problems, a braking device for an aerial work vehicle according to a first aspect of the present invention is provided with a vehicle body including a traveling device (for example, the tire wheel 3 in the embodiment) that can travel, and the vehicle body. A work table that is moved up and down by an elevating device (for example, the boom 5 in the embodiment), a brake pedal (for example, the brake pedal 71 in the embodiment) that is provided in the cab of the vehicle body and that can be stepped on, and the brake pedal Braking force generating means (for example, the master cylinder 73 in the embodiment) that is actuated in response to a stepping operation to generate braking power, and brakes the traveling device by the braking power generated by the braking force generating means. The braking means (for example, the front brake 74 and the rear brake 75 in the embodiment) and the braking force generation means holding the braking operation power and the running A braking device for an aerial work vehicle including auxiliary braking means for maintaining the braking state of the device (for example, the auxiliary braking device for work 80 in the embodiment), which is provided on the work table and operable. When the operation means (for example, the brake lock reset switch 92 in the embodiment) and the auxiliary braking operation means are operated, the braking force generation means and the auxiliary braking means are separated from the depression operation of the brake pedal. It is configured to include braking operation means (for example, the controller 30, the ECU 60, and the pedal operation motor 93 in the embodiment) that are operated to maintain the braking state of the traveling device by the braking means.

  The braking device for an aerial work vehicle according to the second aspect of the present invention includes a vehicle body that can travel with a traveling device (for example, the tire wheel 3 in the embodiment), and a lifting device (for example, an embodiment) provided on the vehicle body. And a brake pedal (for example, the brake pedal 71 in the embodiment) that is provided in the driver's cab of the vehicle body and that can be stepped on, and operates according to the stepping on the brake pedal. Braking force generating means (for example, the master cylinder 73 in the embodiment) that generates braking operation power and braking means (for example, the embodiment) that brakes the traveling device by the braking operation power generated by the braking force generation means. The braking force of the front brake 74 and the rear brake 75) and the braking force generating means is maintained to maintain the braking state of the traveling device. A braking device for an aerial work vehicle provided with auxiliary braking means (for example, an auxiliary braking device for work 80 in the embodiment), the work end detecting means (for example, detecting the end of the high place work by the lifting device) In the embodiment, when the end of the work at a high place is detected by the boom storage detector 194) and the work end detection means, the braking force generating means and the auxiliary braking means are operated, and the traveling device by the braking means is operated. Braking operation means (for example, the controller 30, the ECU 60, and the pedal operation motor 93 in the embodiment) for maintaining the braking state.

  In addition, the braking device for an aerial work vehicle according to the second aspect of the present invention includes work start detection means (for example, a boom retract detector 194 in the embodiment) that detects the start of an aerial work by the lifting device. The braking operation means stops the operation of the braking force generation means and the auxiliary braking means when the work start detection means detects the start of work at a high place, and the braking state of the traveling device by the braking means It is preferable to be configured so as to cancel.

  According to the braking device for an aerial work vehicle according to the first aspect of the present invention, the warning is quickly stopped when the auxiliary braking means is continuously used for a predetermined time directly by an operator on the work table. In addition, it is possible to reset the brake lock state by operating the auxiliary braking means again when the work at high places is completed, so that the auxiliary braking means is activated while preventing noise around the work site. Therefore, it is possible to reduce the work load for making the work and improve the work efficiency.

According to the braking device for an aerial work vehicle according to the second aspect of the present invention, when the end of the aerial work by the elevating device is detected, the auxiliary braking means can be operated again to reset the brake lock state. Therefore, it is possible to reduce the work burden for operating the auxiliary braking means and improve the work efficiency.

  Further, in the braking device for an aerial work vehicle according to the second aspect of the present invention, when the start of the aerial work by the elevating device is detected, the operation of the auxiliary braking means is stopped to temporarily release the brake lock state. With this configuration, it is possible to prevent noise by an alarm around the work site.

It is a side view of an aerial work vehicle according to the present embodiment. It is a block diagram which shows the operating system of the boom and the outrigger jack in the aerial work vehicle. It is a block diagram which shows the structure of the braking device of 1st Embodiment. It is a block diagram which shows the structure of the braking device of 2nd Embodiment.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an aerial work vehicle 1 according to the present embodiment. First, the overall configuration of the aerial work vehicle 1 will be briefly described with reference to FIG.

  An aerial work vehicle 1 includes a vehicle body 2 of a truck-type vehicle that includes tire wheels 3 (front wheels 3a and rear wheels 3b) and that can be driven from a driving cab 2a, and a swivel 4 provided on the vehicle body 2. A telescopic boom (hereinafter simply referred to as a “boom”) 5 having a base end supported on the upper part of the swivel 4, and a work board 8 for boarding an operator attached to the tip of the boom 5. It is comprised. In the present embodiment, an aerial work device 9 is configured mainly by the swivel base 4, the boom 5 and the work table 8, and is mounted on the rear portion of the vehicle body 2.

  The swivel base 4 is attached to the rear part of the vehicle body 2 so as to be rotatable 360 degrees around the vertical axis. A turning motor 51 is provided inside the vehicle body 2, and the turning table 51 can be rotated horizontally through a gear (not shown) by rotationally driving the turning motor 51. The boom 5 has a structure in which a base end boom 5a, an intermediate boom 5b, and a front end boom 5c are assembled in order from the swivel base 4 side, and is extended and retracted by an extension cylinder 53 provided therein. The intermediate boom 5b and the distal boom 5c can be moved relative to the proximal boom 5a, and the entire boom 5 can be expanded and contracted in the axial direction. Further, a hoisting cylinder 52 is provided between the base end boom 5a and the swivel base 4, and the hoisting cylinder 52 can be moved up and down by moving the hoisting cylinder 52 in the vertical direction.

  A vertical post 6 is pivotally supported at the tip of the tip boom 5c via a boom head so as to be swingable in the vertical direction. The vertical post 6 is controlled to swing by an upper leveling cylinder 56b disposed between the vertical post 6 and the tip boom 5c. The upper leveling cylinder 56b is connected by an oil passage communicating with the lower leveling cylinder 56a stretched between the swivel base 4 and the base end boom 5a, and a so-called hydraulic closed circuit type leveling device is configured. The vertical post 6 is always held in a vertical posture regardless of whether the boom 5 is raised or lowered. A boom receiver 20 is provided on the vehicle body 2 to support the boom 5 in a retracted posture. Here, the retracted posture of the boom 5 is a posture in which the lower surface of the intermediate portion of the base end boom 5a is placed on the boom receiver 20, and at this time, the boom 5 is tilted to a substantially horizontal position with the front end portion facing forward of the vehicle body 2. It becomes a state.

The work table 8 has a substantially box shape with an upper end opened, and is rotatably attached to the upper end portion of the vertical post 6 via an arm 7 projecting from the outside. A swing motor 54 is provided inside the arm 7. By rotating the swing motor 54, the entire work table 8 can swing around the vertical post 6 (horizontal turning motion). . Here, since the vertical post 6 is always kept in the vertical posture as described above, as a result, the floor surface of the work table 8 is always held horizontally regardless of the undulation angle of the boom 5.

  The work table 8 is provided with an upper operation device 10 that is operated by an operator on the work table 8. The upper operating device 10 is provided with operation levers for performing the turning operation of the turntable 4, the raising / lowering / extending operation of the boom 5, the swinging operation of the worktable 8, and the like. The operation lever is operated so that the operation of the swivel base 4 and the boom 5 can be performed (these are collectively referred to as “boom operation”). Note that a lower operation device (not shown) for performing a boom operation is attached to the vehicle body 2 in the same manner as the upper operation device 10.

  Outrigger jacks 11 that can be expanded and contracted in the vehicle width direction and can be expanded and contracted vertically are provided on the front, rear, left and right of the vehicle body 2. The outrigger jack 11 is expanded / contracted and expanded / contracted by a jack cylinder 55 attached inside. When working at a high place using the high place working device 9 such as the boom 5, the operator widens and extends the four outrigger jacks 11 in the vehicle width direction according to the relative positional relationship with surrounding obstacles, The vehicle body 2 is lifted and supported by overhanging to ensure a stable posture. A jack operating device 15 (see FIG. 2) is provided at the rear portion of the vehicle body 2, and is configured so that jack operations such as overhang and storage of the outrigger jack 11 can be performed individually. Note that this jack operation (extension operation when ascending, retracting operation when descending the ground) applies a parking brake (not shown) to prevent the vehicle from running away during the operation of the jack, particularly on sloping ground. In addition, the operation auxiliary braking device 80 described later is operated.

  As shown in FIG. 2, the power of the engine E provided in the vehicle body 2 is shifted by the transmission TM and transmitted to the tire wheels 3 via a propeller shaft (not shown). A power take-off mechanism PTO is incorporated in the transmission TM, and the mechanism of the power take-off mechanism PTO is operated when the PTO operation lever 16 in the driving cab 2a is tilted from the off position to the on position (on operation). And the drive destination of the engine E can be switched from the tire wheel 3 to a hydraulic pressure supply unit 40 described later. A PTO switch 17 is provided in the vicinity of the PTO operation lever 16, and when the PTO operation lever 16 is turned on (operated from the off position to the on position), the PTO switch 17 is turned on. Thus, the state of taking out the driving force of the engine E is detected. The engine E is connected to an ECU 60 (see FIG. 3), which is an electronic control unit that controls each part of the engine.

  In the aerial work vehicle 1 configured as described above, the swing motor 51, the hoisting cylinder 52, the telescopic cylinder 53, the swing motor 54, and the jack cylinder 55 include a hydraulic motor or a hydraulic cylinder driven by hydraulic pressure. Such hydraulic actuators are used. Hereinafter, the swing motor 51, the hoisting cylinder 52, the telescopic cylinder 53, the swing motor 54, the jack cylinder 55, and the like are collectively referred to as a hydraulic actuator 50.

  As shown in FIG. 2, the aerial work vehicle 1 is driven by a controller 30 that controls driving of the hydraulic actuator 50 based on operation signals from the upper operation device 10 and the jack operation device 15, and the hydraulic actuator 50. For example, a hydraulic power supply unit 40 for supplying hydraulic oil for operation, and a battery unit 45 as a power source (a power source different from the engine E) for operating an aerial work apparatus or the like.

When the upper operation device 10 or the jack operation device 15 is operated, the controller 30 receives operation signals output from these operation devices 10 and 15 and outputs a control signal corresponding to the operation signals to the hydraulic pressure supply unit 40. Then, hydraulic oil is supplied to the hydraulic actuator 50 to control the operation of the swivel base 4, the boom 5, the work table 8 and the jack 11. The controller 30 is controlled to be turned on / off via the power switch 18. The power switch 18 includes the PTO switch 17 that closes the switch contact based on an operation signal from the PTO operation lever 16. The PTO switch 17 is turned on when the PTO operation lever 16 is turned on. When the switch contact of the controller 30 is closed, the controller 30 is connected to the chassis battery 19 for running control that supplies power to the vehicle-side electrical device including the engine E, and the controller 30 is turned on. (That is, the power switch 18 operates in conjunction with the PTO switch 17). The chassis battery 19 is configured as, for example, a DC power source with a voltage of 24 [V], and its capacity (battery capacity) is lower than that of a body part battery 48 described later, and the rotation of the engine E It is connected to a generator (alternator) that generates electric power by driving, and is charged by supplying the generated electric power.

  The hydraulic pressure supply unit 40 controls the supply of hydraulic oil to the hydraulic actuator 50 based on a control signal from the controller 30. The hydraulic pressure supply unit 40 includes an oil tank T that stores hydraulic oil, a first hydraulic pump P1 that is driven by the power of the engine E taken out by the power take-off mechanism PTO, and power from the battery unit 45. And a second hydraulic pump P2 that is driven by the control and a control valve (electromagnetic proportional control valve) SV that is controlled to be opened and closed by the controller 30. Thus, the hydraulic supply unit 40 is provided with two hydraulic pumps (first hydraulic pump P1 and second hydraulic pump P2) for operating the aerial work device 9, and a power source selection switch (not shown) described later. One of them is selectively driven in accordance with the operation position (1), and the hydraulic oil is sucked up from the oil tank T by the first hydraulic pump P1 or the second hydraulic pump P2 to the control valve SV. Supplied. The supply and discharge control of the hydraulic oil introduced into the hydraulic actuator 50 is performed by electromagnetically driving a spool (not shown) of the control valve SV in accordance with a control signal from the controller 30 to control the valve opening degree. Done. A check valve CV is interposed on the oil passage between each of the hydraulic pumps P1, P2 and the control valve SV.

  The battery unit 45 includes an electric motor 46 connected to the second hydraulic pump P2, a motor control device 47 that controls driving of the electric motor 46, and a body part battery 48 that stores electric power for driving the electric motor 46. It is configured with.

  The body part battery 48 is composed of a plurality of power supply batteries, and each power supply battery is connected in series with each other, and is sufficient to perform a day work at a predetermined voltage of, for example, a voltage of 48 [V]. A direct current power source capable of charging and holding the amount of electric power is configured. In the body part battery 48, the plurality of power supply batteries are mounted on the lower rear part of the vehicle body 2 (rear of the rear wheel 3b) on the left and right sides, and are connected by a power cable (not shown).

  The motor control device 47 is composed of, for example, a step-up DC-DC converter circuit, an inverter circuit, a control circuit for controlling the operation of these circuits, and the like, and direct current power supplied from the body part battery 48 is supplied from the controller 30. The electric power is converted into AC power corresponding to the control signal and supplied to the electric motor 46. The rotational speed of the electric motor 46 (that is, the rotational speed of the second hydraulic pump P2) is controlled and discharged from the second hydraulic pump P2. Controls hydraulic oil discharge pressure and flow rate.

  The upper operating device 10 is provided with a power source selection switch (not shown). This power source selection switch is composed of, for example, a toggle switch that can be tilted to one of the front and rear positions, and the aerial work device 9 and the outrigger jack 11 are connected to the first hydraulic pump P1 according to the operation position. It is possible to select whether to drive with hydraulic oil supplied from the second hydraulic pump or hydraulic oil supplied from the second hydraulic pump P2.

  At this time, when the power source selection switch is selected on the first hydraulic pump P1 side, the controller 30 receives the signal and does not output a motor drive signal to the motor control device 47 of the battery unit 45, and 2 The hydraulic pump P2 is not driven, the engine E is operated at an engine speed corresponding to the operation signal from the upper operating device 10, and the first hydraulic pump P1 is rotated at a speed corresponding to the engine speed by the power take-off mechanism PTO. Drive. On the other hand, when the power source selection switch is selected on the second hydraulic pump P2 side, the controller 30 receives the signal to stop the engine E to stop the first hydraulic pump P1 and perform the upper operation. A motor drive signal corresponding to the operation signal from the device 10 is output to the motor control device 47 of the battery unit 45, and the second hydraulic pump P2 (electric motor 46) is driven at a rotational speed corresponding to the motor drive signal. Therefore, the controller 30 applies the valve opening corresponding to the operation signal from the upper operation device 10 or the jack operation device 15 to the hydraulic oil supplied from the first hydraulic pump P1 or the second hydraulic pump P2 in this way. The control valve SV is controlled to be opened and closed, and the operations of the aerial work device 9 and the outrigger jack 11 are controlled at the operation speed and operation direction corresponding to the control valve SV.

  In addition, if the operation of the outrigger jack 11 is performed in a state where the tire wheel 3 is not reliably braked, the aerial work vehicle 1 may run away. Therefore, the controller 30 receives a detection signal from the brake lock sensor 21 that detects that a work auxiliary brake device (brake lock device) 80 described later is operating. When the operation of the work auxiliary braking device 80 is not detected by the sensor 21, the jack interlock is operated so that the outrigger jack 11 is not operated (the extension operation and the storage operation of the outrigger jack 11 are restricted). It has become.

<First Embodiment>
Next, the braking device according to the first embodiment will be described with additional reference to FIG. The braking device according to the first embodiment includes a controller 30, an ECU 60, a vehicle braking device 70, and a work auxiliary braking device 80. The controller 30 and the ECU 60 can transmit and receive signals to and from each other.

  The vehicle braking device 70 mainly includes a brake pedal 71, a master back (brake booster) 72, a master cylinder 73, a front brake 74, and a rear brake 75.

  In the vehicle braking device 70, when the brake pedal 71 is depressed by an operator who has entered the driving cab 2a, the force is converted into a larger force by the master back 72 using the negative pressure generated by the engine E. The hydraulic pressure (braking force) is converted by the master cylinder 73 and transmitted to the front brake 74 to brake the front wheel 3a, and transmitted to the rear brake 75 to brake the rear wheel 3b. When the depression operation of the brake pedal 71 is released, the braking state for the front and rear wheels 3a and 3b is released. The vehicle braking device 70 is provided with a foot brake sensor 76, and is configured to detect that the brake pedal 71 is depressed and to output a detection signal to the ECU 60 (for example, based on the detection signal). Used to light brake lights).

  On the other hand, the work auxiliary braking device 80 includes a vacuum pump 81, a vacuum tank 82, a vacuum switch 83, a power chamber 84, a brake lock valve 85, a front brake control valve 86, a rear brake control valve 87, a brake pressure switch 88, a brake lock. The switch 89 and the alarm device 90 are mainly configured.

The vacuum pump 81 is configured to be driven by the engine E to maintain the pressure in the vacuum tank 82 at a predetermined negative pressure. The vacuum pump 81 is connected to the power chamber 84 via a brake lock valve 85. When the brake lock valve 85 is opened by a control signal from the ECU 60, the power chamber 84 is activated by the negative pressure of the vacuum pump 82. Let The front brake control valve 86 and the rear brake control valve 87 are configured to open and close the oil passage in response to an operation signal from the ECU 60, and the brake pressure switch 88 is turned on when the oil passage exceeds a predetermined pressure. Is configured to do.

  When the brake lock switch 89 provided in the driving cab 2a is turned on while the brake pedal 71 is depressed, the work auxiliary braking device 80 outputs a detection signal to the ECU 60 and the controller 30. The Further, the ECU 60 and the controller 30 are supplied with a signal from a parking brake sensor 63 that is turned on when a parking brake lever (not shown) disposed on the vehicle body 2 is operated and a parking brake (not shown) is activated. Is entered. Further, a signal from the brake pressure switch 88 and a signal from the foot brake sensor 76 are input to the ECU 60. Therefore, the ECU 60 sets the predetermined hydraulic pressure (braking force) to the front brake 74 and the rear brake 75 when the foot brake sensor 76 is on and the brake pressure switch 88 is on, that is, when the brake pedal 71 is depressed. The front and rear wheels 3a and 3b are braked by closing the front brake control valve 86 and the rear brake control valve 87 to maintain the hydraulic pressure. At the same time, when both the brake lock switch 89 and the parking brake sensor 63 are on, the ECU 60 opens the brake lock valve 85 so that the vacuum tank 82 and the power chamber 84 communicate with each other. The state where the brake pedal 71 is depressed by the operation is maintained. Therefore, even if the depression operation of the brake pedal 71 is stopped, the brake pedal 71 is depressed by the work auxiliary braking device 80, that is, the braking force applied to the front and rear wheels 3a and 3b by the front brake 74 and the rear brake 75. Is held (referred to as “brake lock state”).

  Here, the work auxiliary braking device 80 is obliged to be used within a preset predetermined time (continuous 1 hour). The reason for this is that when the work auxiliary braking device 80 is continuously used over a predetermined time, an excessive load is applied to each part of the work auxiliary brake device 80 and the deterioration of the rubber parts is accelerated, thereby increasing the braking force. This is because it can cause a decrease in the level of the image. Therefore, the alarm device 90 generates an alarm sound when a predetermined time has elapsed since the brake lock state is set, and urges the operator to be careful (release the brake lock state). Yes. On the other hand, the operator can operate the brake lock switch 89 again to turn it off to stop the work auxiliary brake device 80 to release the brake lock state, and stop the alarm sound of the alarm device 90. Can be made.

  By the way, in the work auxiliary braking device 80 having such a configuration, it is necessary to perform all operations required for setting and releasing the brake lock state by getting into the driving cab 2a. For example, when the brake lock state is released to stop the alarm sound with the lapse of a predetermined time during work at a high place, or when the brake lock state is reset to store the outrigger jack 11 at the end of the work, Since it is necessary to temporarily suspend the aerial work (after storing the aerial work device 9 and get off the ground), get into the driving cab 2a and operate the brake pedal 71, the brake lock switch 89, etc. (particularly The work efficiency on sloping terrain is large), and work efficiency may be significantly reduced.

Therefore, in the upper operating device 10 of the work table 8, as shown in FIG. 3, the reset switch 91 and the brake lock resetting switch 92 are also configured to be able to perform resetting and releasing operations of the brake lock state. Yes. Here, the reset switch 91 is configured to be able to be turned on / off, and when the operator who has boarded the work table 8 turns on the switch 91, the operation signal is input to the controller 30. The controller 30 stops the operation of the work auxiliary braking device 80 and releases the brake lock state (as a result, the alarm operation by the alarm device 90 is stopped). On the other hand, the brake lock reset switch 92 is configured to be able to be turned on / off, and when the operator who is on the work table 8 turns on the switch 92, the operation signal is input to the controller 30. Then, the controller 30 electrically operates the brake pedal 71 by a pedal operation motor (electric motor) 93, which will be described later, and operates the auxiliary brake device 80 for operation, so that the front brake 74 and the rear brake 75 are in a brake locked state. Can be set to The pedal operation motor 93 is disposed between the brake pedal 71 and the master bag 72, and applies an operating force to the operating rod 71a of the brake pedal 71 to operate the brake pedal 71 in a depressed state. Can do.

  Note that the controller 30 inputs an operation input to the brake lock reset switch 92 when the parking brake sensor 63 is turned on and the PTO switch 17 and the power switch 18 are turned on as a predetermined condition. Valid. For this reason, if the predetermined condition is not satisfied, the work auxiliary braking device 80 does not operate even if the brake lock reset switch 92 is operated (the operation input of the brake lock reset switch 92 is invalidated). ).

  Next, in order to facilitate understanding of the braking device according to the first embodiment, a characteristic operation thereof will be described. As described above, the hydraulic oil to the aerial work device 9 and the like is supplied from the battery unit 45 by supplying the power of the engine E by the power take-off mechanism PTO and driving the first hydraulic pump P1. In the following, the case where the first hydraulic pump P1 is driven using the power of the engine E by the power take-off mechanism PTO will be described as an example. .

  First, in order to perform an aerial work (for example, an electric wire work), an operator who has driven the aerial work vehicle 1 and arrived at the work site in a state where the engine E is driven, is parked in the driving cab 2a. Operate the brake lever by operating the brake lever. Next, the operator operates the brake lock switch 89 in a state where the brake pedal 71 is depressed in the driving cab 2a, thereby operating the vehicle braking device 70 and the work auxiliary braking device 80 so as to be in the brake locked state. Set to. Subsequently, the operator operates the PTO operation lever 16 disposed in the driving cab 2a. As a result, the first hydraulic pump P1 connected to the output shaft of the power take-off mechanism PTO is rotationally driven by the power of the engine E to generate hydraulic pressure, and the PTO switch 17 is turned on so that the chassis is turned on. Electric power is supplied from the battery 19 to the controller 30 and the controller 30 is turned on (the operation work of the aerial work device 9 and the outrigger jack 11 is enabled). Next, the operator operates the jack operating device 15 to expand and extend the front, rear, left, and right outrigger jacks 11 in the vehicle width direction and project them downward to ground, thereby lifting and supporting the entire vehicle body 2. Then, the operator gets on the work table 8 and operates the upper operation device 10 to activate the work device 9 to move the work table 8 on which he / she is boarding to an arbitrary high position. It is possible to work in high places.

Here, when the worker is working at a high place, when a predetermined time has elapsed since the brake lock state was set, in order to restrict the continuous use of the work auxiliary braking device 80 for a long time, The alarm device 90 is activated to generate a loud alarm sound. In that case, the operator operates the reset switch 91 provided in the upper operation device 10 to stop the work auxiliary braking device 80 to temporarily release the brake lock state and to stop the alarm device 90. The alarm sound can be stopped quickly. Thereby, the operator can continue the high-altitude work as it is at the current high-altitude position without storing the high-altitude work apparatus 9 and returning to the driving cab 2a. Thereafter, when the work at a high place is completed, the operator operates the brake lock reset switch 92 provided in the upper operation device 10 to electrically operate the brake pedal 71 by the pedal operation motor 93, thereby braking the vehicle. The device 70 is operated and the work auxiliary braking device 80 is operated to reset the brake lock state. Then, the operator operates the upper operation device 10 to place the boom 5 on the boom receiver 20 on the vehicle body 2 for storage, and then descends from the work table 8 to the ground via steps and the like. At this time, the operator has already operated the brake lock reset switch 92 from the work table 8 to activate the vehicle braking device 70 and the work auxiliary braking device 80 to reset the brake lock state. There is no need to get into the driving cab 2a and operate the brake pedal 71, the brake lock switch 89, etc., and the jack operating device 15 can be operated as it is, and all the outrigger jacks 11 can be stored.

  As mentioned above, according to the braking device concerning a 1st embodiment, when the auxiliary brake device 80 for work is used continuously for a predetermined time directly by the worker who got on the work table, the warning can be stopped quickly. In addition, it is possible to reset the brake lock state by operating the work auxiliary braking device 80 again when the work at high places is completed. The work burden for operating the braking device 80 can be reduced, and the work efficiency can be improved.

Second Embodiment
Next, a braking device according to a second embodiment will be described. Since the braking device according to the second embodiment has basically the same configuration as the braking device according to the first embodiment, the same configuration (or configuration having the same function) as that of the first embodiment is used. The same numbers will be assigned and the duplicate description will be omitted, and the description will mainly focus on parts that are different from the first embodiment. Here, the braking device according to the second embodiment is shown in FIG.

  The braking device according to the second embodiment includes a controller 30, an ECU 60, a vehicle braking device 70, and a work auxiliary braking device 80.

  A detection signal from a boom retract detector 194 provided in the boom receiver 20 is input to the controller 30. The boom storage detector 194 is composed of a limit switch, for example. When the boom 5 is placed and stored on the boom receiver 20, the switch part of the boom storage detector 194 moves downward by being pressed against the lower surface of the boom 5, and the boom 5 is stored. A detection signal as an off signal indicating the state is output to the controller 30. On the other hand, when the boom 5 is lifted from the boom receiver 20 (in a separated state), the switch unit of the boom retracting detector is released from being pressed by the lower surface of the boom 5 and is in a state where the boom 5 is lifted. A detection signal as an ON signal indicating this is output to the controller 30.

Here, the boom storage detector 194 also functions as a work start detector and a work end detector for detecting the start and end of work at a high place. That is, when the detection signal input from the boom retract detector 194 changes from the off signal to the on signal, that is, when the boom 5 is lifted from the boom receiver 20 by the boom operation by the operator, the controller 30 Detect the start of work. At this time, when the controller 30 detects the start of work at a high place, in order to prevent continuous use of the work auxiliary brake device 80 for a predetermined time, the work auxiliary brake device 80 is stopped and the brake lock state is established. Is released. On the other hand, when the detection signal input from the boom storage detector 194 changes from the on signal to the off signal, that is, the controller 30 stores the boom 5 placed on the boom receiver 20 by the boom operation by the operator. Sometimes it detects the end of an aerial work. At this time, when the controller 30 detects the end of work at a high place, the brake pedal 71 is electrically operated by the pedal operation motor 93 to prepare for the storing operation of the outrigger jack 11 as the subsequent work, and the auxiliary brake for work. The device 80 is activated and reset to the brake lock state.

  Next, in order to facilitate understanding of the braking device according to the second embodiment, a characteristic operation thereof will be described. Below, similarly to the above-mentioned 1st Embodiment, the case where the 1st hydraulic pump P1 is driven using the power of the engine E by the power take-off mechanism PTO is demonstrated and demonstrated.

  First, in order to perform an aerial work (for example, an electric wire work), an operator who has driven the aerial work vehicle 1 and arrived at the work site in a state where the engine E is driven, is parked in the driving cab 2a. Operate the brake lever by operating the brake lever. Next, the operator operates the brake lock switch 89 in a state where the brake pedal 71 is depressed in the driving cab 2a, thereby operating the vehicle braking device 70 and the work auxiliary braking device 80 so as to be in the brake locked state. Set to. Subsequently, the operator operates the PTO operation lever 16 disposed in the driving cab 2a. As a result, the first hydraulic pump P1 connected to the output shaft of the power take-off mechanism PTO is rotationally driven by the power of the engine E to generate hydraulic pressure, and the PTO switch 17 is turned on so that the chassis is turned on. Electric power is supplied from the battery 19 to the controller 30 and the controller 30 is turned on (the operation work of the aerial work device 9 and the outrigger jack 11 is enabled). Next, the operator operates the jack operating device 15 to expand and extend the front, rear, left, and right outrigger jacks 11 in the vehicle width direction and project them downward to ground, thereby lifting and supporting the entire vehicle body 2.

At this time, the boom 5 is in a state of being placed and stored on the boom receiver 20 disposed on the vehicle body 2. Therefore, the boom storage detector 194 outputs an off signal (detection signal) indicating that the boom 5 is stored to the controller 30. Then, the operator gets on the work table 8 in the retracted state from above the vehicle body 2 and operates the upper operation device 10 provided on the work table 8 to lift the boom 5 (for example, raising and lowering). The lower surface of the boom 5 is separated from the boom receiver 20. Thereby, the boom retract detector 194 outputs an ON signal (detection signal) indicating that the boom 5 is in a floating state to the controller 30. At this time, the controller 30 detects the start of the high-altitude work by the high-altitude work device 9 by detecting that the detection signal input from the boom retract detector 194 changes from the off signal to the on signal. When the controller 30 detects the start of work at a high place, the controller 30 sends a control signal to the brake lock valve 85 to close the brake lock valve 85, thereby stopping the operation of the auxiliary brake device for work 80 and the brake lock state. Is released once. By automatically releasing the brake lock state in this way, it is possible to prevent noise caused by an alarm around the work site, and to get into the driving cab 2a from an inclined place or the like to set the auxiliary brake device 80 for work. There is no need to perform an operation for stopping. Then, the operator operates the upper operation device 10 as it is, thereby causing the boom 5 to move up and down, extend and retract, rotate, etc., and move the work table 8 to a desired high position to perform a desired work. be able to.

Thereafter, when the operator finishes the required work, the operator operates the upper operation device 10 to place the boom 5 on the boom receiver 20 disposed on the vehicle body 2 for storage. Thereby, the boom storage detector 194 outputs an off signal (detection signal) indicating that the boom 5 is stored to the controller 30. At this time, the controller 30 detects the end of the high-altitude work by the high-altitude work apparatus 9 when the detection signal input from the boom retract detector 194 changes from the on signal to the off signal. When the controller 30 detects the end of work at a high place, the controller 30 outputs a control signal to the pedal operating motor 93 to rotationally drive the pedal operating motor 93 to operate the brake pedal 71 electrically, and to the brake lock valve 85. By outputting a control signal and opening the brake lock valve 85, the vehicle brake device 70 and the work auxiliary brake device 80 are operated to reset the brake lock state. Then, the worker goes down from the work table 8 in the retracted state to the ground via a step or the like, and performs the retracting operation of the outrigger jack 11. At this time, since the front and rear wheels 3a and 3b are reset to the brake lock state by the automatic control by the controller 30, the operator has to bother to get into the driving cab 2a and operate the brake pedal 71, the brake lock switch 89, etc. However, it is possible to store all the outrigger jacks 11 by operating the jack operating device 15 as it is.

  As described above, according to the braking device according to the second embodiment, when the high altitude work device 9 detects the start of high altitude work, the operation of the work auxiliary braking device 80 is stopped to temporarily release the brake lock state. When the end of high-altitude work by the high-altitude work device 9 is detected, the work auxiliary braking device 80 can be operated again to reset the brake to the locked state. Thus, the work load for operating the work auxiliary braking device 80 can be reduced and work efficiency can be improved.

  In addition, this invention is not limited to the said embodiment, If it is a range which does not deviate from the summary of this invention, it can improve suitably.

  In the above-described embodiment, the work auxiliary brake device including the vacuum pump 81, the power chamber 84, and the like has been described as an example. However, the present invention is not limited to this configuration, and other types of work auxiliary brake devices ( Even if, for example, Japanese Patent Application Laid-Open No. 2003-95599 is employed, the same effects as those of the present embodiment can be obtained.

  Further, in the above-described embodiment, the case where the vacuum tank 82 having a negative internal pressure is used to hold the brake pedal 71 depressed is described. However, the present invention is not limited to this configuration. Instead, the inside of the tank may be set as a positive pressure and the pressure may be used to hold the brake pedal 71 depressed.

  In the above-described embodiment, the pedal operation motor (electric motor) 93 is illustrated and described as an actuator that operates the brake pedal 71 separately from the stepping operation by the worker. However, the present invention is not limited to this configuration. It is possible to employ various actuators such as electric, hydraulic or pneumatic motors and cylinders. In the above-described embodiment, the operating force is applied to the operating rod 71a of the brake pedal 71 by the pedal operating motor 93 and the brake pedal 71 is depressed, but the brake pedal 71 is operated, for example. Instead, the master cylinder 73 may be directly driven to generate a braking force. Alternatively, the brake pedal 71 may be set in a depressed state by operating force on the brake pedal 71 by the power chamber 84 without using another actuator (pedal operating motor 93).

  In the first embodiment described above, the case where the reset switch 91 and the brake lock resetting switch 92 are configured by separate switches has been described as an example. However, the present invention is not limited to this, and the function of the reset switch 91 is not limited thereto. May be integrated with the brake lock reset switch 92 so that the brake lock reset switch 92 serves as both functions.

Further, in the above-described second embodiment, a configuration in which a work start detector and a work end detector for detecting the start and end of work at a high place are combined with one detector (boom storage detector 194) is exemplified. However, the present invention is not limited to this configuration, and the work start detector and the work end detector may be configured by separate detectors. For example, when the automatic storage switch provided in the upper operation device 10 of the work table 8 is operated, the end of the work at a high place may be detected. Here, the automatic storage switch is an operating means for instructing the boom 5 and the work table 8 to be in a predetermined storage posture by automatically storing the boom 5 in the boom receiver 20 when the high-altitude work is completed. Yes, the operation signal of the switch is input to the controller 30. When the automatic storage switch is operated, the boom 5 is automatically stored according to the automatic storage program stored in the controller 30. As described above, when the automatic storage switch is operated and the operation signal is input to the controller 30, the controller 30 may detect the end of the work at the high place. Further, when the operation lever (boom operation lever) provided in the upper operation device 10 is operated, the start of work at a high place is detected, or a hook of a safety belt worn by the operator is provided on the work table 8. When it is detected by the safety belt detector that the safety belt is locked, the start of work at a high place is detected, or the safety belt hook is removed from the locking metal. You may comprise so that completion | finish of an aerial work may be detected when it detects with a detector.

  In the above-described embodiment, the telescopic boom type aerial work vehicle has been described as an example of the aerial work vehicle according to the present invention. However, the present invention is not limited to this. It may be other aerial work vehicles such as a construction work vehicle, a digging pillar car, a bridge inspection car, a railroad car, etc., and the present invention is applied to any aerial work vehicle equipped with an auxiliary brake device for work. Is possible. In the above-described embodiment, the lifting device provided on the vehicle body of the aerial work vehicle has been described by exemplifying a three-stage telescopic boom that can be raised, lowered, extended, and swiveled. As described above, the work table is not limited to the one that can be moved three-dimensionally, and a work table that can only move the work table vertically such as a scissor link type or mast type lifting device may be used.

1 High-altitude work vehicle 2 Car body 3 Tire wheel (traveling device)
5 Boom (elevating device)
8 Work table 10 Upper operation device 11 Outrigger jack 30 Controller (braking operation means)
50 Hydraulic actuator 60 ECU (braking operation means)
70 Vehicle braking device 71 Brake pedal (braking pedal)
72 Master back (braking force generating means)
73 Master cylinder (braking force generating means)
74 Front brake (braking means)
75 Rear brake (braking means)
80 Auxiliary braking device for work (auxiliary braking means)
89 Brake lock switch 90 Alarm device 91 Reset switch 92 Brake lock reset switch (auxiliary braking operation means)
93 Pedal operating motor (braking operating means)
194 Boom storage detector (work start detection means, work end detection means)
E engine

Claims (3)

A vehicle body that can travel with a traveling device, a work table that is moved up and down by a lifting device provided in the vehicle body, a brake pedal that is provided in a driver's cab of the vehicle body and that can be stepped on, and a stepping on the brake pedal Braking force generating means that is actuated according to an operation to generate braking power, braking means that brakes the traveling device by the braking power generated by the braking force generating means, and braking operation of the braking force generating means A braking device for an aerial work vehicle comprising auxiliary braking means for holding power and holding a braking state of the traveling device,
Auxiliary braking operation means provided on the work table and operable,
When the auxiliary braking operation means is operated, the braking force generating means and the auxiliary braking means are operated separately from the stepping operation of the brake pedal to maintain the braking state of the traveling device by the braking means. A braking device for an aerial work vehicle, comprising: a braking operation unit. A vehicle body that can travel with a traveling device, a work table that is moved up and down by a lifting device provided in the vehicle body, a brake pedal that is provided in a driver's cab of the vehicle body and that can be stepped on, and a stepping on the brake pedal Braking force generating means that is actuated according to an operation to generate braking power, braking means that brakes the traveling device by the braking power generated by the braking force generating means, and braking operation of the braking force generating means A braking device for an aerial work vehicle comprising auxiliary braking means for holding power and holding a braking state of the traveling device,
Work end detection means for detecting the end of work at a high place by the lifting device;
Braking operation means for operating the braking force generating means and the auxiliary braking means to maintain the braking state of the traveling device by the braking means when the work completion detecting means detects the end of the high-altitude work. A braking device for an aerial work vehicle, comprising: Comprising work start detecting means for detecting the start of work at a high place by the lifting device;
The braking operation means stops the operation of the braking force generation means and the auxiliary braking means when the work start detection means detects the start of work at a high place, and the braking state of the traveling device by the braking means The braking device for an aerial work vehicle according to claim 2, wherein the brake is released.

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