JP2020139347A - Work vehicle safety device - Google Patents

Abstract

To perform pre-start inspections of sensors that detect operations such as operation levers without operating a work device.SOLUTION: An operation control device comprises an operation lever 32 operated by an operator, a work device control valve 60 that controls the supply of hydraulic oil from a hydraulic pump 83 to a swivel motor 63a and the like in response to an operation of the operation lever 32, and a switching valve 88 capable of shutting off the supply of hydraulic oil from the hydraulic pump 83 to the swivel motor 63a or the like via the work device control valve 60. A pre-start inspection device comprises a first lever position detector 65 that detects the operation of the operation lever 32, and a pre-start inspection switch 52 that can be operated by the operator. When the pre-start inspection switch 52 is operated, the switching valve 88 shuts off the supply of hydraulic oil from the hydraulic pump 83 to the swivel motor 63a or the like, and the first lever position detector 65 detects the operation of the operation lever 32 and performs a pre-start inspection.SELECTED DRAWING: Figure 3

Description

The present invention relates to a work vehicle provided with a work device operated by a hydraulic actuator, and more particularly to a work vehicle provided with a pre-start inspection device.

Work vehicles such as drilling pillar vehicles, aerial work platforms, and crane vehicles are configured to have various work devices on the vehicle body, and the work devices are operated by hydraulic actuators (hydraulic cylinders, hydraulic motors), etc. The configuration is generally known. For example, a digging pillar car is configured by attaching a boom to a swivel base that is horizontally swivelable on the vehicle body so as to be undulating and telescopic, and to attach a winch device and an earth auger device to the boom (for example, patent). Reference 1). The working devices in the digging valve wheel, that is, the boom, winch device, and earth auger device are configured to be operated by hydraulic actuators (hydraulic cylinders, hydraulic motors), and hydraulic control that controls the operation of these hydraulic actuators. A valve is provided. The configuration in which the hydraulic actuator is provided and the operation is controlled by the hydraulic control valve is the same for aerial work platforms, crane vehicles, and other work vehicles.

Such a work vehicle is provided with an operation lever and operation switches, and the operator operates these to operate the hydraulic control valve, and the hydraulic control valve controls the supply and discharge of hydraulic oil to the hydraulic actuator. It is configured to control the operation of the working device. At this time, a sensor for detecting the operation (operation direction and operation amount) of the operation lever is provided, and an operation signal control type configuration for controlling the operation of the hydraulic control valve by receiving the operation signal detected and sent by this sensor, or A linear motion control type configuration is known in which the operation of the operating lever is directly transmitted to the spool of the operating valve to control the operation of the hydraulic control valve. In the linear motion control type configuration, it is often necessary to detect the operation direction of the operation lever, and a sensor for detecting the operation of the operation lever is often provided.

Patent No. 5390113

Generally, when working with a work vehicle, before starting work, check whether the work equipment such as these hydraulic control valves operate normally (pre-start inspection) to ensure work safety. It has been done conventionally. Such a pre-start inspection is performed by the operator operating the operating levers and confirming whether the working device operates normally by the hydraulic actuator. By the way, for example, even if the work vehicle is in a garage or the like with the work device stored and the work device cannot be operated, only the sensors can be inspected without operating the work device. There are requests and issues regarding whether or not there are any. If it can be confirmed that the sensors are normal by this inspection, the vehicle may be moved to the work site and the work equipment may be actually operated to inspect the work equipment including the operation inspection of the hydraulic control valve and the hydraulic actuator. This is because the pre-start inspection can be performed efficiently.

In this case, in the case of the operation signal control type configuration that receives the operation signal and controls the operation of the hydraulic control valve, if the signal transmission control is performed so as not to send this operation signal to the hydraulic control valve, the hydraulic control valve Only the sensors can be inspected without operating (and without operating the work device by the hydraulic actuator). However, there is a problem that it is necessary to change the control signal system for pre-start inspection to correspond to this. On the other hand, in the case of the linear motion control type configuration, when the operating lever is operated, the valve spool directly connected to the operating lever is moved, so that the hydraulic control valve inevitably operates. Therefore, in a configuration having a sensor for detecting the operation of the operation lever, there is a problem that it is difficult to first inspect only the sensors.

In view of such a problem, the present invention is a safety device for a work vehicle having a work device using a hydraulic actuator, and operates the hydraulic actuator for pre-start inspection of a sensor or the like for detecting the operation of an operation lever or the like. It is an object of the present invention to provide a safety device for a work vehicle having a pre-start inspection device that can be performed without, that is, without operating the work device.

In order to achieve the above object, the safety device for the work vehicle according to the present invention includes a work device operated by a hydraulic actuator, an operation control device for controlling the operation of the work device, and the start-up of the work device and the operation control device. It is equipped with a pre-start inspection device that performs pre-inspection. Then, from the operation device operated by the operator, the hydraulic control valve that controls the hydraulic oil supply from the hydraulic supply source to the hydraulic actuator in response to the operation of the operation device, and the hydraulic pressure supply source. It is provided with a switching valve capable of shutting off the hydraulic oil supply to the hydraulic actuator via the hydraulic control valve, and the pre-start inspection device can be operated by an operation detector for detecting the operation of the operation device and an operator. It is equipped with a pre-start inspection indicator, and when the pre-start inspection indicator is operated, the switching valve shuts off the hydraulic oil supply from the hydraulic supply source to the hydraulic actuator, and the operation detector performs the operation. It is configured to detect the operation of the device and perform the pre-start inspection by the pre-start inspection device.

In the safety device for the work vehicle, preferably, the hydraulic control valve is a linear motion control type mechanically connected to the operating device.

In the safety device of the work vehicle, preferably, the hydraulic oil supply from the hydraulic supply source to the hydraulic actuator is cut off by the switching valve only while the pre-start inspection indicator is being operated, and the operation detection is performed. The device is configured to detect the operation of the operating device and perform a pre-start inspection.

According to the present invention, when the pre-start inspection indicator is operated, the switching valve shuts off the hydraulic oil supply from the hydraulic supply source to the hydraulic actuator, and the operation detector operates the operating device. Is detected and the pre-start inspection is performed by the pre-start inspection device, so the pre-start inspection performed by operating the pre-start inspection indicator is performed by operating the work device (and the hydraulic actuator that operates it). Only the control equipment related to the operation detector that detects the operation of the operation device can be independently inspected without causing the operation. As a result, even when the work vehicle is located in a narrow space such as a garage, the pre-start inspection can be performed.

In the safety device of the work vehicle, when the hydraulic control valve is a linear motion control type mechanically connected to the operating device, the switching valve is used when the pre-start inspection indicator is operated. Since the hydraulic oil supply from the hydraulic supply source to the hydraulic actuator is cut off, the hydraulic actuator does not operate even if the spool of the hydraulic control valve is operated in conjunction with the operation of the operating device. For this reason, in a work vehicle configured using a linear motion control type hydraulic control valve, a control device related to an operation detector that detects the operation of the operation device even when the work vehicle is located in a narrow space such as a garage. Only can be independently inspected before the start of work.

In the safety device of the work vehicle, the hydraulic oil supply from the hydraulic supply source to the hydraulic actuator is cut off by the switching valve only while the pre-start inspection indicator is operated, and the operation detector causes the operation detector to shut off the hydraulic oil supply. It is preferable to detect the operation of the operating device and perform the pre-start inspection. As a result, the worker can recognize that the pre-start inspection is performed while operating the pre-start inspection indicator, and the pre-start inspection device can be configured to accurately perform the pre-start inspection. it can.

It is a side view which shows the electric pole suspension work state of the hole-drilling pillar wheel to which this invention was applied. It is a side view which shows the said digging pillar car in a digging work state. It is a block diagram which shows the operation control device composition of the said hole excavation pillar car. It is a flowchart which shows the inspection control flow before the start of work of the said drilling pillar car. It is a block diagram which shows the operation control device configuration of the hole excavation pillar car which concerns on a different embodiment.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. 1 and 2 show a hole-drilling pillar vehicle as an example of a work vehicle equipped with a pre-start inspection device using the present embodiment. Further, FIG. 3 shows the operation control device configuration of the digging pillar car. The digging pillar car 1 is capable of traveling with front and rear wheels on the front, rear, left and right sides of the vehicle body 11, and is configured based on a truck vehicle having a driving cab 11a in the front portion of the vehicle body 11. A swivel base 12 is attached to the front portion of the vehicle body 11 so as to be swivelable by a swivel motor 63a (hydraulic motor). Further, a boom 13 is undulatingly attached to the upper part of the swivel base 12 by an undulating cylinder 63b. The boom 13 is a nested three-stage boom composed of a base end boom 13a, an intermediate boom 13b, and a tip boom 13c, and can be expanded and contracted by a built-in telescopic cylinder 63c. The swivel motor 63a, the undulating cylinder 63b, and the telescopic cylinder 63c are not shown in FIGS. 1 and 2.

A boom head 20 is fixed to the tip of the tip boom 13c, and a hook 18 is suspended by a wire 17 via a sheave (not shown) rotatably attached to the inside of the boom head 20. A winch device (not shown) is provided at the base end portion (or swivel base 12) of the base end boom 13c, and this winch device is driven by a winch motor 63d (see FIG. 3, consisting of a hydraulic motor) of the wire 17. The hook 18 can be pulled up and down by winding and unwinding.

An auger bracket 14 is attached to the boom 13 so as to be slidable in the longitudinal direction, and an earth auger device 15 for excavating a posthole is attached to the auger bracket 14. The earth auger device 15 is composed of a connecting rod member 15a pivotally connected to the auger bracket 14, an auger driving device 15b attached to the tip of the connecting rod member 15a, and an auger screw 15c rotationally driven by the auger driving device 15b. It is composed. The auger drive device 15b has an auger motor 63e (hydraulic motor) and rotationally drives the auger screw 15c in response to the oil pressure supplied from the vehicle body side.

When the earth auger device 15 is used, the auger bracket 14 is coupled to the tip boom 13c and the entire earth auger device 15 is moved to a desired position according to the expansion and contraction of the tip boom 13c. Then, as shown in FIG. 2, the auger screw 15c is rotationally driven to dig a hole H for the building column. On the other hand, when the earth auger device 15 is not used, the auger bracket 14 is coupled to the base end boom 13a and the earth auger device 15 is stored and held at a position (position shown in FIG. 1) along the side of the base end boom 13a. .. In this state, as shown in FIG. 1, it is possible to suspend the utility pole D by the hook 18.

A work operation table 30 is erected immediately after the driving cab 11a in the vehicle body 11 and in front of the swivel table 12. The work operation table 30 includes a chair 31 on which the operator sits and an operation device 33 located in front of the chair 31, and the operator sitting on the chair 31 operates the operation lever 32 and the like of the operation device 33 to perform various operation operations described later. I do.

Further, an out-trigger device 40 that supports the vehicle body 11 during work is provided in front of and behind the vehicle body 11. Each out-trigger device 40 includes an out-trigger (not shown) extending in the vehicle width direction and attached to the vehicle body, and an out-trigger jack 42 extending downward and attached to the tip of the out-trigger. The out-trigger is composed of an out-trigger box that extends in the vehicle width direction of the vehicle body 11 and is fixed, and left and right out-trigger beams 41 that are stretchably arranged in the out-trigger box. An outrigger jack 42 is attached to the tip of each outrigger beam, and the outrigger jack 42 is moved to the side of the vehicle body by expanding and contracting the outrigger beam 41 with respect to the outrigger box by the built-in beam cylinder 73a (see FIG. 3, hydraulic cylinder). It can be extended or pulled in from the position stored in the vehicle to the outside of the vehicle body (in the width direction of the vehicle).

The outer trigger jack 42 includes an outer post 42a connected to the tips of the left and right beam rods, an inner post 42b built in the outer post 42a and expandable downward, and a ground plate 42c attached to the lower end of the inner post 42b. It consists of. Therefore, the inner post 42b is extended downward by the built-in jack cylinder 73b (see FIG. 3, hydraulic cylinder) to ground the grounding plate 42c, and the vehicle body 11 can be lifted and supported.

The swivel operation of the swivel base 12, the undulation and expansion / contraction operation of the boom 13, the winch operation, the operation of the auger drive device 15b, the expansion / contraction operation of the out trigger beam 41 and the out trigger jack 42, etc. are performed from the hydraulic drive source provided on the vehicle body 11. The hydraulic actuator (hydraulic motor, hydraulic cylinder, etc.) is driven by the hydraulic pressure supply. As will be described later, the hydraulic drive source is composed of a hydraulic pump driven via a PTO by an engine that rotationally drives the wheels, and the hydraulic pump supplies hydraulic pressure to the hydraulic actuator. Therefore, a plurality of control valves for controlling the hydraulic pressure supply are provided on the vehicle body 11, and the operator sitting on the chair 31 of the work operation table 30 operates the operation lever 32 and the like to control the operation of the control valves. Is done. Further, an out-trigger control device 75 that controls the operation of the out-trigger beam 41 and the out-trigger jack 42 is provided on the vehicle body (not shown in FIGS. 1 and 2).

The device configuration for controlling the operation of the drilled pillar wheel 1 having the above configuration will be described with reference to FIG. In FIG. 3, the solid line indicates the signal or power line, and the broken line indicates the hydraulic line. In the drilling pillar wheel 1, as described above, the swivel motor 63a (hydraulic motor) that swivels the swivel base 50 horizontally, the undulating cylinder 63b (hydraulic cylinder) that undulates the boom 13, and the boom 13 expand and contract. A telescopic cylinder 63c (hydraulic cylinder) to be operated, a winch motor 63d (hydraulic motor) for driving the winch device, an auger motor 63e (hydraulic motor) for rotating the auger screw 15c of the earth auger device 15, and a beam rod of the out trigger device 40. A beam cylinder 73a (hydraulic cylinder) for expanding and contracting the inner post 42b and a jack cylinder 73b (hydraulic cylinder) for moving the inner post 42b up and down are provided.

The drilling pillar wheel 1 includes a working device control valve 60 that controls the supply and discharge of hydraulic oil to the swivel motor 63a, the undulating cylinder 63b, the telescopic cylinder 63c, the winch motor 63d, and the auger motor 63e. The spool 61 of the working device control valve 60 is connected to the operating lever 32 via the connecting link 61a so that the working device control valve 60 is linearly controlled by the operating lever 32 of the operating device 33. The operating lever 32 is provided with a first lever position detector 65 that detects the operating position thereof. The first lever position detector 65 detects whether or not the operating lever 32 is in the neutral position, and further detects in which direction the operating lever 32 was operated when it was operated. Although only one operating lever 32 is shown in FIG. 3, a plurality of operating levers 32 are actually provided corresponding to each hydraulic actuator.

When the operator sitting on the chair 31 of the work operation table 30 operates the operation lever 32, this operation is directly transmitted to the spool 61 via the connecting link 61a to switch the work device control valve 60. As a result, in response to the operation of the operation lever 32, the work device control valve 60 is operated to control the supply and discharge of hydraulic oil to the swivel motor 63a, the undulating cylinder 63b and the telescopic cylinder 63c, and the swivel table 12 is swiveled. Control, undulation operation of boom 13 and expansion / contraction operation control are performed. Similarly, regarding the operation of the winch device and the earth auger device, the winding / unwinding control of the wire 17 by the winch motor 63d in the winch device and the auger motor 63e in the earth auger device 15 are performed according to the operation of the corresponding operation levers 32. The rotation drive control of the auger screw 15c is performed by.

The out-trigger device 40 is also provided with an out-trigger control valve 70 in order to perform operation control for expanding and contracting the beam rod with respect to the beam box by the beam cylinder 73a and operation control for expanding and contracting the inner post 42b up and down by the jack cylinder 73b. .. The spool 71 of the out-trigger control valve 70 is connected to the operation lever 76 via the connecting link 71a so that the out-trigger control valve 70 is linearly controlled by the operation lever 76 of the out-trigger control device 75. When the operator operates the operating lever 76 of the out-trigger control device 75, this operation is directly transmitted to the spool 71 via the connecting link 71a to operate the out-trigger control valve 70. As a result, in response to the operation of the operating lever 76, the out trigger control valve 70 operates to control the supply and discharge of hydraulic oil to the beam cylinder 73a and the jack cylinder 73b, and the beam rod expands and contracts with respect to the beam box. Control and operation control for moving the inner post 42b up and down with respect to the outer post 42a are performed. The operating lever 76 is provided with a second lever position detector 77 that detects the operating position thereof. The second lever position detector 77 detects whether or not the operating lever 76 is in the neutral position, and further detects in which direction the operating lever 76 was operated when it was operated.

By the way, hydraulic oil from the hydraulic pump 83 is supplied to the working device control valve 60 and the outrigger control valve 70. The hydraulic pump 83 is driven from an engine (ENG) 81 (or an electric motor) for rotationally driving the wheels 85 via a power take-off machine (PTO) 82. The hydraulic pump 83 driven by the engine ENG supplies the hydraulic oil in the tank 84 to the working device control valve 60 via the first oil passage 83a and to the outrigger control valve 70 via the second oil passage 83b. .. Here, a switching valve 88 that controls switching of the first oil passage 83a is arranged to allow the flow of hydraulic oil through the first oil passage 83a, or shut off the oil passage 83a to control the working device control valve 60. It is possible to prevent the supply of hydraulic oil to the valve. The switching valve 88 also controls switching of the second oil passage 83b to allow the flow of hydraulic oil through the second oil passage 83b, or shuts off the oil passage 83b to supply hydraulic oil to the out trigger control valve 70. It is possible to prevent the operation from being performed.

The operation of the switching valve 88 is controlled by the controller 50. As shown in FIG. 3, detection signals from various detectors 51 are input to the controller 50. The various detectors 51 include a boom swivel angle detector 51a that detects the swivel angle of the boom 13 due to the swivel of the swivel table 12, a boom undulation angle detector 51b that detects the undulation angle of the boom 13, and an extension amount of the boom 13. Toward the vehicle body side of the boom length detector 51c, the suspension load detector 51d that detects the suspension load when the hook 18 is lifted, the vehicle body tilt angle detector 51e that detects the inclination of the vehicle body 11, and the beam rod in the out trigger device 40. There is a jack overhang amount detector 51f that detects the overhang amount of the rod, and a detection signal from each detector is sent to the controller 50. Further, the detection signals from the first lever position detector 65 and the second lever position detector 77 described above are also sent to the controller 50.

The controller 50 controls the operation of the switching valve 88 based on the input signal transmitted in this way. Hereinafter, the specific control thereof will be described below. First, so-called interlock control is performed by the controller 50. This is a control in which the outrigger device 40 supports the vehicle body before the boom 13 is operated to lift the winch device or dig a hole by the earth auger device 15. As shown by the alternate long and short dash line in FIGS. 1 and 2, when the boom 13 is retracted, the controller 50 shuts off the first oil passage 83a by the switching valve 88 and opens the second oil passage 83b. As a result, the hydraulic oil from the hydraulic pump 83 is supplied to the outrigger control valve 70 through the second oil passage 83b, but is not supplied to the working device control valve 60.

Therefore, even if the operation lever 32 of the operation device 33 is operated to move the spool 61 of the work device control valve 60, the hydraulic oil is not supplied, so that the boom 13 is operated to lift the work device by the winch device. , The hole digging work by the earth auger device 15 cannot be performed. On the other hand, when the operation lever 76 of the out-trigger control device 75 is operated to move the spool 71 of the out-trigger control valve 70, the out-trigger control valve 70 controls the supply and discharge of hydraulic oil to the beam cylinder 73a and the jack cylinder 73b. .. As a result, the operation control for expanding and contracting the beam rod with respect to the beam box and the operation control for expanding and contracting the inner post 42b up and down can be performed, and the grounding plate 42c can be grounded to stably support the vehicle body 11.

When the controller 50 detects that the vehicle body 1 is stably supported by the out trigger device 40 in this way, the controller 50 opens the first oil passage 83a by the switching valve 88. As a result, the operation lever 32 of the operation device 33 can be operated to operate the work device control valve 60 to operate the boom 13, and further, lifting work by the winch device and hole digging work by the earth auger device 15 are performed. You will be able to do it. When the boom 13 is operated and the boom 13 is no longer in the retracted state, the controller 50 closes the second oil passage 83b by the switching valve 88, and even if the operating lever 75 of the out trigger control device 75 is operated, the beam is operated by the out trigger control valve 70. The hydraulic oil cannot be supplied to and discharged from the cylinder 73a and the jack cylinder 73b. As a result, it is possible to prevent the out-trigger device 40 from being accidentally operated while the boom 13 is being operated to impair the stability of the support of the vehicle body 11. The above is the interlock control.

By the way, this digging pillar car 1 also has a configuration for performing a pre-start inspection, which will be described below. As the pre-start inspection device, as shown in FIG. 3, a pre-start inspection switch 52 operated by an operator, a monitor 53, and an alarm device 54 are provided. The pre-start inspection switch 52 is operated by the operator and sends an operation signal to the controller 50 while it is in the ON state, and the controller 50 performs a pre-start inspection while this operation signal is being sent. In order to inform the operator that the pre-start inspection switch 52 is in the ON state, the notification buzzer (not shown) is sounded while the pre-start inspection switch 52 is in the ON state. The monitor 53 displays a display instructing the operator to perform the pre-start inspection when the pre-start inspection switch 52 is operated and turned on. When an abnormality is found as a result of the pre-start inspection, the alarm device 54 gives an alarm notification.

FIG. 4 shows a pre-start inspection flow performed by the controller 50 with the pre-start inspection switch 52 turned on. The contents of the pre-start inspection will be explained along this flow. First, it is determined whether or not the pre-start inspection switch 52 is operated and turned on (step S1). When this is turned on, the process proceeds to step S2, and the switching valves 88 close the first and second oil passages 83a and 83b so that the operation control by the working device control valve 60 and the out trigger control valve 70 does not operate. Then, the notification buzzer indicating that the pre-start inspection switch 52 is in the ON state is activated, and the buzzer is sounded (step S3).

In response to this, the operator is displayed on the monitor 53 with the operation for the pre-start inspection. Specifically, for example, "After confirming that the operation lever is neutral with the pre-start inspection switch turned on, turn the turning operation lever to the right, then turn to the left, and then perform the undulation operation. Move the lever up and down, move it up and down, and then extend and contract the telescopic lever. Make sure that the boom does not move at this time. ”Is displayed. In addition, instead of the instruction on the monitor 53, an instruction to that effect may be given manually.

When the operator operates the operation lever according to the above instructions, the controller 50 first determines whether or not the operation levers 32 and 76 are in the neutral position based on the detection signal from the first lever position detector 65. (Step S5). Since the pre-start inspection is performed with the operating levers 32 and 76 in a neutral state, when it is determined that this is not in the neutral position, the first lever position detector 65 determines that it is abnormal.

When the operating levers 32 and 76 are in the neutral position, the process proceeds to step S6, and the operator operates the operating lever in response to the above instructions. Therefore, the detection signal according to the procedure is the first lever position detector 65. And check whether it is sent from the second lever position detector 77. At this time, if the detection signal according to the procedure is input, it is determined that the detection-related equipment including the first lever position detector 65 and the second lever position detector 77 is operating normally, and the pre-start inspection is performed. Notify the completion (step S8). On the other hand, when a detection signal different from the procedure is input or when the detection signal does not change, it is determined that the detection-related equipment including the first lever position detector 65 and the second lever position detector 77 is abnormal. Then, an alarm is given by the alarm device 54, or an abnormality occurrence is displayed on the monitor 53 (step S7).

As described above, in this pre-start inspection, the first and second oil passages 83a and 83b are closed by the switching valve 88 in step S2. Therefore, even if the operator operates the operation levers 32 and 76 to move the spools 61 and 71 of the work device control valve 60 and the outrigger control valve 70, the boom operates or the winch device or the earth auger device operates. And the outrigger device does not operate. Therefore, for example, even when the hole-drilling pillar car 1 is in a narrow space such as a garage, the pre-start inspection can be performed. When the boom operates, the winch device or the earth auger device operates, or the outrigger device operates when the operator operates the operating levers 32 and 76, the switching valve 88 and the working device control It can be determined that an abnormality has occurred in the valve 60, the outrigger control valve 70, or the like. The valve for controlling the hydraulic oil supply to the winch motor 63d and the auger motor 63e may be directly supplied with hydraulic pressure without passing through the switching valve 88, that is, without performing the interlock control.

As described above, in the pre-start inspection control, the switching valve 88 used for the interlock control is also used, and the device configuration can be simplified. In particular, interlock control has been often used in the past, and there is an effect that a work vehicle having such interlock control can be provided with a pre-start inspection device with a relatively easy and simple configuration. is there.

Although the preferred embodiment of the present invention has been described so far, the scope of the present invention is not limited to the above embodiment, and can be appropriately improved as long as it does not deviate from the gist of the present invention. For example, in the control device of FIG. 3, the operation of the operation levers 32 and 76 directly moves the spools 61 and 71 of the work device control valve 60 and the out trigger control valve 70 via the connecting links 61a and 71a. Yes, but not limited to this. That is, as shown in FIG. 5, the operation signal control type configuration may be used.

The operation signal control type operation control device configuration shown in FIG. 5 differs from the device configuration of FIG. 3 in that the operation device 133 and the out trigger control device 175 and the work device control valve 160 and the out trigger control valve 170 are different from each other. Are the same. Therefore, the same constituent members are assigned the same number and the description thereof will be omitted. The operating device 133 includes an operating lever 132 and a first lever position detector 165 that detects the operating direction and operating amount of the operating lever 132. The operation signal detected by the first lever position detector 165 is sent to the controller 50. The working device control valve 160 includes a solenoid 161 that controls the spool position, and the solenoid 161 controls the spool position by operating control from the controller 50.

In this configuration, when the operation signal detected by the first lever position detector 165 is sent to the controller 50, the controller 50 controls the operation of the solenoid 161 in response to the operation signal to operate the work device control valve 160. Control. As a result, the operation of the working device control valve 160 is controlled according to the operation of the operating lever 132, the supply and discharge of the hydraulic oil to the swivel motor 63a, the undulating cylinder 63b and the telescopic cylinder 63c are controlled, and the swivel table 12 is swiveled. Operation control, undulating operation of the boom 13, and expansion / contraction operation control are performed. Similarly, regarding the operation of the winch device and the earth auger device, the wire 17 is wound and unwound by the winch motor 63d in the winch device and the auger motor 63e in the earth auger device 15 is operated according to the operation of the corresponding operation lever 132. The auger screw 15c is driven to rotate.

The out-trigger control device 175 includes an operation lever 176 and a second lever position detector 177 that detects the operation direction and operation amount of the operation lever 176. The operation signal detected by the second lever position detector 177 is sent to the controller 50. The out-trigger control valve 170 includes a solenoid 171 that controls the spool position, and the solenoid 171 controls the spool position by operating control from the controller 50. In this configuration, when the operation signal detected by the second lever position detector 177 is sent to the controller 50, the controller 50 controls the operation of the solenoid 171 in response to the operation signal, and controls the operation of the out trigger control valve 170. To do. As a result, the operation of the out-trigger control valve 170 is controlled in response to the operation of the operating lever 176, the supply and discharge of hydraulic oil to the beam cylinder 73a and the jack cylinder 73b are controlled, and the beam rod is expanded and contracted with respect to the beam box. Operation control and operation control for expanding and contracting the inner post 42b up and down are performed.

In the operation signal control type operation control device shown in FIG. 5 having such a configuration, the interlock control and the pre-start inspection are performed by using the switching valve 88 as in the case of the operation control device shown in FIG. Since the contents are the same, the description thereof will be omitted.

1 Drilling pillar car 11 Body 12 Swivel 13 Boom 15 Earth auger device 30 Work operation table 32 Operation lever 40 Out trigger device 50 Controller 52 Pre-start inspection switch 54 Alarm device 60 Work device control valve 65 1st lever position detector 70 Out trigger control valve 75 2nd lever position detector 88 switching valve

Claims (3)

Safety of a work vehicle including a work device operated by a hydraulic actuator, an operation control device for controlling the operation of the work device, and a pre-start inspection device for performing a pre-start inspection of the work device and the operation control device. It ’s a device,
The operation control device includes an operating device operated by an operator, a hydraulic control valve that controls hydraulic oil supply from a hydraulic supply source to the hydraulic actuator in response to the operation of the operating device, and the hydraulic pressure from the hydraulic pressure supply source. A switching valve capable of shutting off the hydraulic oil supply to the hydraulic actuator via the control valve is provided.
The pre-start inspection device includes an operation detector that detects the operation of the operation device and a pre-start inspection indicator that can be operated by an operator.
When the pre-start inspection indicator is operated, the switching valve shuts off the hydraulic oil supply from the hydraulic supply source to the hydraulic actuator, and the operation detector detects the operation of the operating device to start the work. A safety device for work vehicles that is characterized by performing pre-start inspections using a pre-inspection device. The safety device for a work vehicle according to claim 1, wherein the hydraulic control valve is a linear motion control type mechanically connected to the operating device. Only while the pre-start inspection indicator is being operated, the switching valve shuts off the hydraulic oil supply from the hydraulic supply source to the hydraulic actuator, and the operation detector detects the operation of the operating device. The safety device for a work vehicle according to claim 1 or 2, characterized in that it is configured to perform a pre-start inspection.

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