JP3767738B2 - Hydraulic work vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hydraulic work vehicle on which a work machine including a hydraulic actuator is mounted so as to be able to be loaded and unloaded.
[0002]
[Prior art]
As this type of hydraulic work vehicle, there is known a dust collection vehicle equipped with a dust collection container as a work machine so that it can be loaded and unloaded. The container of this garbage collection vehicle is provided with a dust loading device driven by hydraulic pressure, and a hydraulically driven discharge plate for discharging collected dust from the container. On the carrier side, a hydraulic cylinder for loading and unloading containers is provided.
[0003]
In this garbage collection vehicle, a hydraulic pump and an oil reservoir are provided on the carrier side to drive the carrier side hydraulic actuator, and the connection pipe branched from the carrier side hydraulic pipe is connected to the container side hydraulic pressure. It is connected to the piping to drive the hydraulic actuator on the container side.
[0004]
The container can be loaded and unloaded on the carrier, for example, so that the container can be unloaded from the carrier and used at a factory or an event venue. For stationary use, disconnect the container-side hydraulic piping from the carrier-side hydraulic piping, remove the container from the carrier, and connect the container-side hydraulic piping to the hydraulic unit installed at the site (factory, etc.). The actuator is driven.
[0005]
[Problems to be solved by the invention]
However, in a hydraulic work vehicle such as the above-described garbage collection vehicle, the amount of hydraulic oil inside the actuator changes as the hydraulic actuator on the working machine (for example, the container) side operates as a single-acting cylinder or a multistage cylinder. When an object is used, it is necessary to match the state of the actuator when the work machine is lowered from the carrier with the state of the actuator when the work machine is mounted on the carrier.
[0006]
That is, for example, in a multi-stage cylinder, the amount of internal hydraulic fluid increases when it is in the extended state, and the internal hydraulic fluid amount decreases when it is in the contracted state. Therefore, if the work implement is lowered from the carrier with the multistage cylinder extended, and the work implement is placed on the carrier with the multistage cylinder contracted, the hydraulic oil is taken out from the hydraulic work vehicle to the local hydraulic unit. It will be. Conversely, when the multistage cylinder is lowered from the carrier and placed on the carrier in the extended state, the hydraulic oil is excessively taken into the hydraulic work vehicle from the hydraulic unit. In this case, one of the hydraulic work vehicle and the hydraulic unit has a reduced amount of hydraulic oil, and the other has an excessive amount of hydraulic oil, both of which hinder the operation.
[0007]
The present invention does not cause the operation oil to be taken out or excessively taken in even if the state of the actuator when the work machine is lowered from the carrier does not match the state of the actuator when the work machine is mounted on the carrier. In addition, when the work machine is lowered from the carrier and used, it is not necessary to separately prepare a hydraulic unit.
[0008]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention is configured such that the working machine side hydraulic circuit is configured separately from the carrier side hydraulic circuit so that the working machine can be used alone, and the carrier side has a carrier Separately from the side hydraulic circuit, a hydraulic pump for the work implement is provided so that it can be used when the work implement is installed.
[0009]
That is, the invention according to claim 1 is a hydraulic work vehicle in which a work machine including a hydraulic actuator is mounted on a carrier so as to be able to be loaded and unloaded.
A carrier-side hydraulic circuit configured by providing a first hydraulic pump and a first reservoir on the carrier side;
A work machine side hydraulic circuit configured to be provided with a second hydraulic pump and a second reservoir for driving the hydraulic actuator on the work machine side;
A third hydraulic pump for driving the hydraulic actuator provided on the carrier side so as to be connectable / detachable to / from the work machine side hydraulic circuit is provided.
[0010]
Therefore, work on the carrier side such as loading and unloading of the work implement can be performed using the carrier side hydraulic circuit having the first hydraulic pump and the first reservoir. When the work implement is lowered from the carrier, the hydraulic actuator of the work implement can be driven by the hydraulic oil in the second reservoir using the second hydraulic pump provided in the work implement. When the work implement is mounted on the carrier, the hydraulic actuator can be driven using the hydraulic oil in the second reservoir by connecting the third hydraulic pump to the work implement-side hydraulic circuit.
[0011]
As described above, when the work implement is mounted on the carrier and used, and when the work implement is used after being lowered from the carrier, the working oil of the second reservoir for the work implement is used. Even if the state of the hydraulic actuator is not made to coincide with that at the time of mounting, there is no problem of taking out hydraulic oil from the carrier side hydraulic circuit or taking in excess hydraulic oil into the carrier side hydraulic circuit. Further, when the work machine is lowered from the carrier, the work machine can be used alone without separately preparing a hydraulic unit.
[0012]
The invention according to claim 2 is the hydraulic work vehicle according to claim 1,
The first hydraulic pump and the third hydraulic pump are simultaneously driven by the same driving means,
The third hydraulic pump is configured to be selectively connected to the work implement side hydraulic circuit and the first reservoir.
[0013]
Thus, if the first hydraulic pump and the third hydraulic pump are driven by the same driving means, it is not necessary to provide a drive source dedicated to the third hydraulic pump, but the hydraulic pressure on the carrier side is used. When the first hydraulic pump is driven for work, the third hydraulic pump for the work machine is operated at the same time.
[0014]
On the other hand, in the present invention, since the third hydraulic pump is connected to either the work machine side hydraulic circuit or the first reservoir, when the work machine is lowered from the carrier, the third hydraulic pump is connected. By connecting the hydraulic pump to the first reservoir, the hydraulic oil can be circulated between the third hydraulic pump and the first reservoir, so that an excessive load acts on the third hydraulic pump or the hydraulic oil leaks. It is prevented from occurring. When the work implement is mounted on the carrier, if the third hydraulic pump is connected to the work implement side hydraulic circuit, the operation is similarly performed between the third hydraulic pump and the second reservoir of the work implement side hydraulic circuit. Oil can be circulated, and it is possible to prevent an overload from acting on the third hydraulic pump and leakage of hydraulic oil.
[0015]
The invention according to claim 3 is the hydraulic work vehicle according to claim 1,
In order to prohibit the driving of the third hydraulic pump when the third hydraulic pump is not connected to the work implement side hydraulic circuit, the third hydraulic pump and the work implement side hydraulic circuit are connected or disconnected. It has a detecting means for detecting.
[0016]
Accordingly, it is possible to prevent the third hydraulic pump from being driven without being connected to the work machine side hydraulic circuit, causing an excessive load to act on the third hydraulic pump or causing hydraulic oil to leak.
[0017]
The invention according to claim 4 is the hydraulic work vehicle according to claim 2,
In order to prohibit the driving of the third hydraulic pump by the driving means when the third hydraulic pump is not connected to either the work machine side hydraulic circuit or the first reservoir, the third hydraulic pump It has a detecting means for detecting whether it is connected to either the working machine side hydraulic circuit and the first reservoir or not connected to either of them.
[0018]
Therefore, it is possible to prevent the third hydraulic pump from being driven without being connected to either the work machine side hydraulic circuit or the first reservoir so that an excessive load acts on the third hydraulic pump or leakage of hydraulic oil occurs. Can be removed.
[0019]
【The invention's effect】
As described above, according to the first aspect of the present invention, the carrier-side hydraulic circuit configured such that the carrier is provided with the first hydraulic pump and the first reservoir, and the working machine has the second hydraulic pressure for driving the hydraulic actuator. A work machine side hydraulic circuit configured to be provided with a pump and a second reservoir; and a third hydraulic pump for driving the hydraulic actuator is provided on the carrier so that the work machine side hydraulic circuit can be connected to and disconnected from the work machine side hydraulic circuit. Therefore, it is possible to take out hydraulic fluid from the carrier-side hydraulic circuit or take in excess hydraulic fluid into the carrier-side hydraulic circuit without matching the state of the hydraulic actuator between when the work implement is lowered from the carrier and when it is mounted. There is no problem, and when the work machine is lowered from the carrier, the work machine can be used alone without preparing a hydraulic unit separately.
[0020]
According to the invention according to claim 2, in the hydraulic work vehicle described in claim 1, the first hydraulic pump and the third hydraulic pump are simultaneously driven by the same driving means. Since the 3 hydraulic pump is configured to be selectively connected to the work machine side hydraulic circuit and the first reservoir, this connection allows the work machine to be mounted on the carrier when the work machine is being lowered from the carrier. In any case, the discharge oil of the third hydraulic pump can be circulated, and it is possible to prevent an excessive load from acting on the third hydraulic pump and the leakage of hydraulic oil.
[0021]
According to the invention of claim 3, in the hydraulic work vehicle described in claim 1, the first hydraulic pump and the third hydraulic pump are driven simultaneously by the same driving means, while the third hydraulic pressure Detection means for detecting whether or not the pump is connected to the work implement side hydraulic circuit is provided, and when the connection is detected, driving of the first hydraulic pump and the third hydraulic pump by the drive means is permitted. Therefore, it is possible to prevent the third hydraulic pump from being driven without being connected to the work machine side hydraulic circuit, causing an excessive load to act on the third hydraulic pump or causing leakage of hydraulic oil.
[0022]
According to the invention of claim 4, in the hydraulic work vehicle described in claim 2,
The first hydraulic pump and the third hydraulic pump are driven simultaneously by the same driving means, while whether or not the third hydraulic pump is connected to either the work machine side hydraulic circuit or the first reservoir. Since detection means for detecting is provided and the first hydraulic pump and the third hydraulic pump are allowed to be driven by the drive means when the connection is detected, the third hydraulic pump is connected to the work machine side hydraulic circuit. It is possible to prevent the third hydraulic pump from being overloaded or leaking hydraulic oil by being driven without being operated.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0024]
In the refuse collection vehicle (hydraulic work vehicle) shown in FIG. 1, 1 is a cab, 2 is a chassis, and 3 is a dust collection container (work machine) mounted on the chassis 2 so that it can be loaded and unloaded by the cargo handling means 4.
[0025]
The container 3 includes a dust container box 5 and a dust container box 6 connected to the rear end opening of the dust container box 5 so as to be opened downward. The dust storage box 5 is provided with a discharge plate (not shown) for discharging the stored dust from the rear end opening, and this discharge plate is driven by a multistage hydraulic cylinder described later. The dust throwing box 6 is provided with a dust loading device (not shown) for loading the thrown dust into the dust storage box 5, and this dust loading device is also driven hydraulically. The container 3 is placed on the ground by a leg 7 at the front end of the dust container 5 and a caster 8 at the rear end of the dust container 6.
[0026]
The cargo handling means 4 includes an L-shaped cargo handling arm 11 whose rear end at the horizontal portion is pivotally supported by the rear end of the chassis 2, and is engaged with the upper end of the vertical portion of the cargo handling arm 11 at the upper front end of the container 3. A hook 12 is provided. A rotating cylinder 13 for rotating the cargo handling arm 11 rearward is connected to the horizontal portion of the cargo handling arm 11 and the front portion of the chassis 2. The horizontal portion of the cargo handling arm 11 is formed to be extendable and contractible by an extendable cylinder 14. Both the rotating cylinder 13 and the telescopic cylinder 14 are hydraulic cylinders.
[0027]
FIG. 1 shows a state where the container 3 is being unloaded. When the container 3 is stacked on the chassis 2 from the ground behind the chassis 2, the cargo handling arm 11 is rotated rearward by operating the rotating cylinder 13 to extend and the hook 12 is locked to the container 3. When the cargo handling arm 11 is rotated forward by reducing the rotation cylinder 13 in this state, the front end of the container 3 is lifted and pulled forward, and the main girder 15 of the container 3 is moved to the rear of the chassis 2. It is placed on the end guide roller 16 (state shown in FIG. 1). When the cargo handling arm 11 is further rotated forward, the container 3 is completely placed on the chassis 2. Next, the telescopic cylinder 14 is extended to move the vertical portion of the cargo handling arm 11 together with the container 3 forward.
[0028]
When the container 3 is lowered, the reverse operation of the above stacking is performed. That is, the expansion and contraction cylinder 14 is contracted to move the container 3 rearward, and the rotation cylinder 13 is extended in this state to rotate the cargo handling arm 11 rearward. As a result, the container 3 is lifted at the front end, moved on the guide roller 16 and moved rearward, the caster 8 at the rear end is landed (state shown in FIG. 1), and pushed out to the rear of the chassis 2.
[0029]
<Hydraulic circuit of garbage truck>
FIG. 2 shows a hydraulic circuit of the garbage truck. The carrier side hydraulic actuator is not shown. Further, regarding the hydraulic actuator on the container side, only the multi-stage hydraulic cylinder 21 for the discharge plate is shown, and the others are not shown. In FIG. 2, the right side divided by a two-dot chain line is a hydraulic system provided on the carrier side, and the left side is a hydraulic system provided on the container side.
[0030]
In the carrier-side hydraulic system, a tandem pump 22 is driven by a power take-off device (PTO) 20 of the carrier traveling engine. The tandem pump 22 is formed by connecting a first hydraulic pump 23 that drives a carrier-side hydraulic actuator and a third hydraulic pump 24 that drives a container-side hydraulic actuator in series. The first hydraulic pump 23 is configured to discharge the hydraulic oil in the first reservoir 25, and the discharged oil returns to the first reservoir 26 through the carrier side control valve 26. Pressure oil is supplied from the carrier-side control valve 26 to each hydraulic actuator on the carrier side. That is, the first hydraulic pump 23, the first reservoir 25, and the carrier side control valve 26 constitute a carrier side hydraulic circuit 38.
[0031]
Further, a hydraulic pipe 39 for the container is provided on the carrier side. That is, a hydraulic oil discharge pipe 27 and a suction pipe 28 are connected to the third hydraulic pump 24. Couplers (pipe joints) 29 and 30 are attached to the distal ends of the discharge pipe 27 and the suction pipe 28, respectively. A check valve 31 is provided on the discharge side, and a relief valve 32 and an orifice 33 are provided between the discharge side and the suction side.
[0032]
On the carrier side, branch pipes 34 and 35 branched from the hydraulic oil supply pipe from the first reservoir 25 to the first hydraulic pump 23 and the return pipe from the carrier side control valve 26 to the first reservoir 26, respectively. Is provided. Couplers 36 and 37 are attached to the tips of the branch pipes 34 and 35, respectively.
[0033]
In the container side hydraulic system 41 is a second hydraulic pump driven by an electric motor 42. The second hydraulic pump 41 discharges hydraulic oil from the second reservoir 43, and the discharged oil returns to the second reservoir 43 via the container-side control valve 44. Pressure oil is supplied from the container-side control valve 44 to the container-side hydraulic cylinder 21 and other hydraulic actuators. That is, the hydraulic cylinder 21, the second hydraulic pump 41, the second reservoir 43, and the container side control valve 44 constitute a container side hydraulic circuit 40.
[0034]
Further, on the container side, a branch pipe branched from each of a hydraulic oil supply pipe from the second reservoir 43 to the second hydraulic pump 41 and a pressure oil supply pipe from the second hydraulic pump 41 to the container side control valve 44. 45 and 46 are provided. Couplers 47 and 48 are attached to the tips of the branch pipes 45 and 46, respectively. A check valve 49 is provided on the pipe between the second hydraulic pump 41 and the branch pipe 46.
[0035]
The coupler 29 of the discharge pipe 27 of the third hydraulic pump 24 is configured to be selectively connected to the coupler 37 of the carrier side branch pipe 35 and the coupler 48 of the container side branch pipe 46. The coupler 30 of the suction pipe 28 of the third hydraulic pump 24 is configured to be selectively connected to the coupler 36 of the carrier side branch pipe 34 and the coupler 47 of the container side branch pipe 45.
[0036]
In the above, when the container 3 is mounted on the carrier, the coupler 29 of the discharge pipe 27 of the third hydraulic pump 24 is connected to the coupler 48 of the container side branch pipe 46 and the coupler 30 of the suction pipe 28 is connected to the container side branch. Connect to the coupler 47 of the tube 45.
[0037]
When the tandem pump 22 is driven, the hydraulic oil in the container-side second reservoir 43 is supplied to the container-side control valve 44 by the third hydraulic pump 24 via the discharge pipe 27 and the branch pipe 46 and returns to the second reservoir 43. Therefore, the pressure oil can be supplied to each hydraulic actuator on the container side by operating the container side control valve 44, and the dust can be loaded or discharged with the discharge plate. In addition, since the first hydraulic pump 23 operates simultaneously with the third hydraulic pump 24, pressure oil can be supplied to each hydraulic actuator on the carrier side by operating the carrier side control valve 26.
[0038]
When the container 3 is lowered to the ground, the coupler 29 of the discharge pipe 27 of the third hydraulic pump 24 is removed from the coupler 48 of the container side branch pipe 46 and connected to the coupler 37 of the carrier side branch pipe 35. Further, the coupler 30 of the suction pipe 28 of the third hydraulic pump 24 is removed from the coupler 47 of the container side branch pipe 45 and connected to the coupler 36 of the carrier side branch pipe 34.
[0039]
Then, the tandem pump 22 is driven to supply pressure oil from the first hydraulic pump 23 to the carrier-side control valve 26, and the pressure oil is supplied to the rotating cylinder 13 and the telescopic cylinder 14 by operating the control valve 26. Supply and unload container 3 from the carrier. At this time, the third hydraulic pump 24 is also operated at the same time. However, since hydraulic oil circulates between the third hydraulic pump 24 and the first reservoir 25, an excessive load acts on the third hydraulic pump 24. Or leakage of hydraulic oil is prevented.
[0040]
When the container 3 is stationary on the ground, the second hydraulic pump 41 is driven by the electric motor 42. As a result, the hydraulic oil in the second reservoir 43 is supplied to the container-side control valve 44 by the second hydraulic pump 41 and returns to the second reservoir 43. Therefore, the pressure oil can be supplied to each hydraulic actuator on the container side by operating the container side control valve 44, so that dust can be loaded and the discharge plate can be moved. Therefore, it is not necessary to separately prepare a hydraulic unit for stationary use.
[0041]
When the container 3 is stacked on the carrier, the tandem pump 22 is driven and pressure oil is supplied from the first hydraulic pump 23 to the carrier-side control valve 26 in the same manner as when the container 3 is lowered. The pressure oil is supplied to the rotation cylinder 13 and the expansion / contraction cylinder 14. At this time as well, the third hydraulic pump 24 operates simultaneously, but since hydraulic oil circulates between the third hydraulic pump 24 and the first reservoir 25, an overload acts on the third hydraulic pump 24, It is prevented that hydraulic fluid leaks.
[0042]
As described above, since the hydraulic oil of the second reservoir 43 on the container side is used when the container 3 is used while being mounted on the carrier and when it is used after being lowered from the carrier, the container 3 is Even if the state of the hydraulic actuator, particularly the hydraulic cylinder 21 for the discharge plate, does not coincide between when the carrier is lowered from the carrier and when the carrier is mounted, the hydraulic oil is taken out from the carrier side hydraulic circuit 38 or excessive to the carrier side hydraulic circuit 38. There is no problem with hydraulic oil uptake.
[0043]
<Coupler detachment detection and power take-off device operation regulation>
-Example 1-
As shown in FIG. 3, branch pipes 45 and 46 are disposed at the front lower end portion of the container 3 with the couplers 47 and 48 at the tip thereof facing forward. A baffle plate 51 and a limit switch 52 are provided for detecting that the couplers 29 and 30 of the carrier side pipes 27 and 28 are not connected.
[0044]
The baffle plate 51 is an L-shape having a horizontal plate portion 51a extending forward under the couplers 47 and 48 and a vertical plate portion 51b rising from the front end of the horizontal plate portion 51a. The baffle plate 51 is pivotally supported by the mounting plate 53 of the container body so that the rear end of the horizontal plate portion 51a is pivotable up and down, and is attached upward by a spring 54 so that the horizontal plate portion 51a is substantially horizontal. The vertical plate portion 51b is positioned so as to block the end surfaces of the couplers 47 and 48 from the front side when the horizontal plate portion 51a becomes substantially horizontal.
[0045]
As shown in FIG. 4, when connecting the couplers 29 and 30 of the carrier side pipes 27 and 28 to the couplers 47 and 48 of the container side branch pipes 45 and 46, the baffle plate 51 is resisted against the bias of the spring 54. Will push down. In the state where the couplers are connected, the baffle plate 51 is kept in the pushed-down state with the upper end of the vertical plate portion 51b hitting the carrier side branch pipes 27, 28 or the couplers 29, 30 thereof.
[0046]
The limit switch 52 is supported by the lower end of a bracket 55 that projects downward from the container body. The limit switch 52 is turned on or off by contact with the horizontal plate portion 51a when the vertical plate portion 51b of the baffle plate 51 is in a position to block the end surfaces of the couplers 47 and 48 from the front. The drive of the pump 22 is prohibited. That is, even if the operation switch of the power take-out device 20 is turned on to drive the tandem pump 22 by the engine, the power take-out device 20 is not activated. On the other hand, when the baffle plate 51 is pushed down against the bias of the spring 54 due to the connection between the couplers, the limit switch 52 is brought into a non-contact state with the lateral plate portion 51a, and the operation of the power take-out device 20 is performed. Will be allowed.
[0047]
Therefore, in the above configuration, it can be said that the baffle plate 51 and the limit switch 52 urged by the spring 54 constitute detection means for detecting that the couplers are not connected to each other. Then, even if the container 3 is mounted on the carrier, if it is detected that the couplers are not connected, the operation of the power take-off device 20 is prohibited, so that the third hydraulic pump 24 is disabled. It is possible to prevent the third hydraulic pump 24 from operating and being overloaded and causing hydraulic oil to leak.
[0048]
The above example relates to the connection between the couplers 29 and 30 of the carrier side pipes 27 and 28 and the couplers 47 and 48 of the container side branch pipes 45 and 46, but also to the couplers 36 and 37 of the branch pipes 34 and 35 on the carrier side. Similar baffle plates and limit switches are provided. Therefore, when the container 3 is unloaded from the carrier, the power take-out device 20 operates unless the couplers 29 and 30 of the carrier side pipes 27 and 28 are connected to the couplers 36 and 37 of the carrier side branch pipes 34 and 35. Similarly, it is possible to prevent the third hydraulic pump 24 from operating carelessly, causing an excessive load to act on the third hydraulic pump 24 and causing leakage of hydraulic oil.
[0049]
-Example 2-
In the above example 1, it is detected that the couplers are not connected to each other, but in this example, it is detected whether the couplers are completely connected.
[0050]
FIG. 5 shows a socket-type coupler 29 (a coupler at the tip of the discharge pipe 27 of the third hydraulic pump 24) and a plug-type coupler 48 (a coupler at the tip of the container side branch pipe 46) that enable such detection. ing.
[0051]
In the socket type coupler 29, 60 is a socket adapter for coupling the discharge pipe 27, and 61 is a cylindrical socket body. A cylindrical collar 62 and a cylindrical valve holder 63 are fitted side by side in the axial direction inside the socket body 61. A cylindrical slide valve 64 is fitted inside the collar 62 and the valve holder 63, and a stem 65 is fitted inside the slide valve 64. A sleeve 66 is fitted on the outside of the socket body 61. The stem 65 is at the axial center position of the coupler 29, and the socket adapter 60, the socket body 61, the collar 62, the valve holder 63, the slide valve 64, the stem 65 and the sleeve 66 are provided concentrically.
[0052]
The stem 65 has a base end portion having a diameter larger than that of the intermediate portion, and the base end portion is brought into contact with a step portion formed on the inner surface of the socket adapter 60 so that the stem 65 cannot move in the axial direction. A communication hole 67 through which hydraulic oil passes is formed at the base end portion. The slide valve 64 is urged so as to be movable in the axial direction with respect to the stem 65 and moved forward by a spring 68 (the side on which the plug-type coupler 48 is inserted is referred to as “front”). It has been.
[0053]
An oil passage 69 communicating with the communication hole 67 is formed between the slide valve 64 and the intermediate portion of the stem 65. When the slide valve 64 is at the forward end (the state shown in FIG. 5) whose front end surface is flush with the front end surface of the stem 65, the front end portion outer periphery whose front end inner peripheral surface is the larger diameter of the stem 65. It fits into the surface through a seal, and thereby the front end of the oil passage 69 is closed. The front end portion of the slide valve 64 has an outer diameter slightly smaller than that of the intermediate portion, and a stepped portion 70 is formed on the outer peripheral surface of the boundary between the front end portion and the intermediate portion.
[0054]
The valve holder 63 is received at the proximal end portion of the stem 65 so that the valve holder 63 does not move in the axial direction. A stopper 71 that holds the slide valve 64 at the forward end against the bias of the spring 68 is formed at the front end of the valve holder 63.
[0055]
The collar 62 is provided so as to move in the axial direction by sliding on the inner peripheral surface of the socket body 61 so as to be fitted to the valve holder 63, and is urged so as to move forward by a spring 72. Is provided. The front end of the collar 62 protrudes inward, and the inner peripheral surface of the protruding portion slides on the outer peripheral surface of the front end portion of the slide valve 64. Further, when the collar 62 moves rearward, the protruding portion engages with the step portion 70 of the slide valve 64.
[0056]
The socket body 61 is fixed by being fitted into the socket adapter 60. An accommodation hole for the ball 73 is formed in the front portion of the socket body 61. The thickness of the socket body 61 on the rear side of the ball receiving hole is smaller than the diameter of the ball 73. In addition, the front side of the socket body 61 with respect to the ball receiving hole is formed to have a slightly larger outer diameter than the rear side. Further, a stopper that holds the collar 62 at the forward end where the front end surface thereof is flush with the front end surface of the stem 65 against the bias of the spring 72 at a position rearward of the ball receiving hole of the socket body 61. 74 is formed.
[0057]
The sleeve 66 is fitted to the front portion of the socket adapter 60 and the socket body 61 so as to be movable in the axial direction, and is urged to move forward by a spring 75. An annular groove for accommodating the ball 73 is formed on the inner peripheral surface of the front portion of the sleeve 66. The sleeve 66 is prevented from moving forward when the rear side portion of the annular groove contacts the ball 73.
[0058]
The inner diameter on the rear side of the annular groove of the sleeve 66 is formed smaller than the outer diameter on the front side of the ball housing hole of the socket body 61. That is, the front portion of the socket body 61 from the ball receiving hole serves as a stopper that prevents further forward movement when the rear portion of the annular groove of the sleeve 66 moves forward beyond the ball receiving hole. Yes.
[0059]
Thus, a proximity sensor (proximity switch) 76 is attached to the outer peripheral surface of the socket adapter 60, while a flange 77 is attached to the socket body 61. The relationship between the proximity sensor 76 and the flange 77 will be described later.
[0060]
In the plug-type coupler 48 shown in FIG. 5, 80 is a plug adapter for coupling the branch pipe 46, and 81 is a cylindrical plug body. The plug body 81 is fixed by being fitted into the plug adapter 80. A valve body 82 is fitted inside the plug body 81, and a collar 83 is fitted inside the valve body 82. The collar 83 is in the axial center position of the coupler 48, and the plug adapter 80, the plug body 81, the valve body 82, and the collar 83 are provided concentrically.
[0061]
An annular groove 84 into which the ball 73 is fitted is formed on the front outer peripheral surface of the plug body 81. The valve body 82 is provided so as to be movable in the axial direction with respect to the plug body 81, and moves forward by a spring 86 interposed between the spring receiver 85 held by the plug adapter 80 and the valve body 82. It is so energized. A stopper 87 for positioning the valve body 82 at the front end of the plug body 81 against the bias of the spring 86 is positioned at the forward end (the forward end where the front end surface of the valve body 82 is flush with the front end surface of the plug body 81). Is formed. Further, the inner diameter of the rear portion of the plug body 81 is larger than the outer diameter of the valve body 82 so as to form an oil passage described later.
[0062]
The collar 83 is provided so as to be movable in the axial direction with respect to the valve main body 82, and is moved forward by a spring 89 interposed between the spring receiver 88 held by the valve main body 82 and the collar 83. Is being energized. A stopper 90 is formed inside the valve body 82 to position the collar 83 at the forward end (the forward end where the front end surface of the collar 83 is flush with the front end surface of the valve body 82) against the bias of the spring 89. ing. An oil passage 91 is formed in the spring receiver 84.
[0063]
As described above, when the socket type coupler 29 is not connected to the plug type coupler 48, the collar 62 and the slide valve 64 are at the forward end, and the oil passage 69 is closed by the slide valve 64 and the stem 65. Further, the sleeve 66 abuts on the ball 73 and is prevented from moving forward, and the flange 77 is close to the proximity sensor 76. On the other hand, when the plug-type coupler 48 is not connected to the socket-type coupler 29, the valve main body 82 and the collar 83 are at the forward end, and the oil passage in the coupler is closed by the valve main body 82 and the collar 83.
[0064]
When the plug type coupler 48 is inserted into the socket type coupler 29, the plug body 81 pushes in the collar 62 of the socket side coupler 29 as shown in FIG. Go backwards.
[0065]
In the socket-type coupler 29, the collar 62 comes into contact with the stepped portion 70 of the slide valve 64 as the collar 62 moves backward, and the slide valve 64 also moves backward. By this retreat, the oil passage 69 is released forward by the seal by the slide valve 64 and the stem 65 being released.
[0066]
On the other hand, in the plug-type coupler 48, when the collar 83 is retracted until it comes into contact with the spring receiver 87, the valve body 82 is also retracted along with the collar 83. As a result, an oil passage 92 communicating with the oil passage 69 on the socket-type coupler 29 side is formed between the plug body 81 and the valve body 82, as shown in FIG.
[0067]
Further, when the plug body 81 of the plug type coupler 48 pushes forward the collar 62 of the socket type coupler 29 and the annular groove 84 of the plug body 81 reaches the position of the ball receiving hole of the socket body 61, the ball 73 becomes the annular groove 84. Get stuck. As a result, the sleeve 66 of the socket-type coupler 29 is released from the forward stop by the ball 73 and is advanced by the bias of the spring 75, and the ball 73 is pushed into the annular groove 84 of the plug body 81. That is, the connection between the socket type coupler 29 and the plug type coupler 48 is locked. The sleeve 66 is prevented from advancing by a portion of the socket body 61 in front of the ball receiving hole. Therefore, the flange 77 is separated from the proximity sensor 76.
[0068]
The proximity sensor 76 is turned on when the flange 77 is approaching, and prohibits the driving of the tandem pump 22 by the power take-out device 20. That is, the power take-off device 20 does not operate even when the operation switch is turned on. On the other hand, when the flange 77 is separated by the connection between the couplers 29 and 48, the proximity switch 76 is turned off, and the operation of the power take-out device 20 is permitted.
[0069]
Therefore, in the above configuration, it can be said that the proximity switch 76 and the flange 77 constitute detection means for detecting the connection between the couplers. Then, even if the container 3 is mounted on the carrier, if the connection between the couplers is not detected, the operation of the power take-off device 20 is prohibited, so that the third hydraulic pump 24 is inadvertently operated. It is possible to prevent an excessive load from acting on the third hydraulic pump 24 and leakage of hydraulic oil.
[0070]
In the case of this example, unless the couplers are completely connected to each other, the flange 77 is not separated from the proximity sensor 76, and the proximity sensor 76 is not turned off. Therefore, the operation of the third hydraulic pump 24 in the coupler non-connected state is performed. It can be reliably prevented. That is, even if the operator performs the connection operation between the couplers, if the connection is poor, the third hydraulic pump 24 does not operate, which is advantageous for preventing accidents.
[0071]
The above is an example of the socket-type coupler 29 at the tip of the discharge pipe 27 of the third hydraulic pump 24 and the plug-type coupler 48 at the tip of the container-side branch pipe 46. Similarly, the coupler 30 at the tip of the suction pipe 28 of the hydraulic pump 24 is also a socket-type coupler and a plug-type coupler having a proximity sensor 76 and a flange 77, and when the connection of the two sets of couplers is detected by the proximity sensor 76 together. The power take-out device 20 is configured to be permitted to operate.
[0072]
Similarly, the couplers 36 and 37 of the carrier-side branch pipes 34 and 35 are socket-type couplers and plug-type couplers having the proximity sensor 76 and the flange 77, so that when the container 3 is lowered from the carrier, the carrier It is possible to prevent the third hydraulic pump 24 from operating while the coupler on the side is not connected or is poorly connected.
[0073]
A proximity sensor may be provided in the plug adapter 80 of the plug-type coupler, and the proximity movement of the sleeve 66 of the socket-type coupler may be detected by the proximity sensor. In short, it may be configured to detect the movement of the sleeve when the couplers are completely connected to permit the operation of the power take-out device.
[Brief description of the drawings]
FIG. 1 is a side view showing an example of a hydraulic work vehicle according to the present invention.
FIG. 2 is a diagram in which a part of the hydraulic circuit of the hydraulic work vehicle is omitted.
FIG. 3 is a perspective view showing detection means for detecting that the coupler of the hydraulic work vehicle is not connected.
FIG. 4 is a perspective view showing the detection means when a coupler is connected.
FIG. 5 is a side view, partly in section, showing the coupler of the hydraulic work vehicle in a disconnected state.
FIG. 6 is a partially omitted cross-sectional view showing the coupler of the hydraulic work vehicle in a connected state.
[Explanation of symbols]
1 cab
2 chassis
3 Container (work machine)
4 Handling methods
20 Power take-off device (drive means)
21 Multistage hydraulic cylinder of container
22 Tandem pump
23 First hydraulic pump
24 3rd hydraulic pump
25 First reservoir
26 Carrier side control valve
29, 30 coupler
36, 37 coupler
38 Carrier side hydraulic circuit
39 Hydraulic piping for containers
40 Container side hydraulic circuit
41 Second hydraulic pump
42 Electric motor
43 Second reservoir
44 Container side control valve
47, 48 coupler
51 baffle plate
52 Limit switch
66 sleeve
76 Proximity switch
77 Flange

Claims (4)

In a hydraulic work vehicle equipped with a work machine equipped with a hydraulic actuator so that it can be loaded and unloaded on a carrier,
A carrier-side hydraulic circuit configured by providing a first hydraulic pump and a first reservoir on the carrier side;
A work machine side hydraulic circuit configured to be provided with a second hydraulic pump and a second reservoir for driving the hydraulic actuator on the work machine side;
A hydraulic work vehicle comprising: a third hydraulic pump for driving the hydraulic actuator provided on the carrier side so as to be connectable to and disconnected from the work machine side hydraulic circuit. In the hydraulic work vehicle according to claim 1,
The first hydraulic pump and the third hydraulic pump are simultaneously driven by the same driving means,
The hydraulic work vehicle, wherein the third hydraulic pump is configured to be selectively connected to the work implement side hydraulic circuit and the first reservoir. In the hydraulic work vehicle according to claim 1,
In order to prohibit the driving of the third hydraulic pump when the third hydraulic pump is not connected to the work implement side hydraulic circuit, the third hydraulic pump and the work implement side hydraulic circuit are connected or disconnected. A hydraulic work vehicle comprising a detecting means for detecting. In the hydraulic work vehicle according to claim 2,
In order to prohibit the driving of the third hydraulic pump by the driving means when the third hydraulic pump is not connected to either the work machine side hydraulic circuit or the first reservoir, the third hydraulic pump A hydraulic work vehicle comprising: a detecting unit configured to detect whether the work machine side hydraulic circuit and the first reservoir are connected to each other or not connected thereto.

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