JPH0434217Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides an electric control mechanism that automatically operates an electromagnetic control valve for a hydraulic actuator for lifting or turning a ground work device, and The present invention relates to a structure of an operating section for a working device in an earthmoving vehicle in which a manual override section of a control valve and an interlocking mechanism of an operating tool for the manual override section are shielded and arranged below an operating step.

[Conventional technology]

The above-mentioned earthmoving vehicle is designed so that even if a failure occurs in the electrical system, the working equipment can be operated using the operating tool.

In this type of earthmoving vehicle, the operating tool for use in the event of a failure is stored below the operating step so that it does not become an obstacle to maneuvering during normal times, and the interlocking mechanism is not activated due to vibrations of the machine during normal times. Utility Application No. 172451/1983 proposed the use of a retracted operating tool as a member that fixes the interlocking mechanism inoperable in order to prevent the control valve from being manipulated. . In other words, the swingable operating tool mounting member constituting the interlocking mechanism is provided with two operating tool mounting parts, and when the operating tool is attached to one of the mounting parts, one end protrudes upward from the operating step. When the operating tool is in the retracted state where it is retracted below the operating step when the operating tool is attached to the other mounting part, and
The operating tool is configured to be in a locked state in which it engages with a locking tool provided so as to engage with the operating tool and fix the operating tool mounting member so that it cannot swing. In this case, there was room for improvement as follows.

[Problem that the invention attempts to solve]

When switching the operating tool between the operating state and the storage lock state, it is necessary to perform an operation to change the operating tool, which is time-consuming.

The purpose of the present invention is to store the operating tool below the operation step, and to make it possible to use the stored operating tool as a member of the interlocking mechanism lock. To enable easy switching of lock states.

[Means for solving problems]

The characteristic configuration of the present invention is that, in the structure of the operating unit for the working equipment in the earthmoving vehicle mentioned above, the operating tool mounting member constituting the interlocking mechanism is mounted so as to swing around the vertical axis, and the upper end side The operating tool is slidably attached to the operating tool mounting member so that the operating tool can be slidably moved between a raised use position that projects upward from the operating step and a lowered storage position that is retracted below the top surface of the operation step. A locking device that engages with a tool and fixes the interlocking mechanism inoperably is disengaged when the operating tool is operated to the raised use position and is operated to the lowered storage position. When the operating tool is rotated by a specific rotation with respect to the operating tool mounting member, The operation is performed in a state in which the operating tool is configured to act when the operating tool is in the operating tool mounting member, and to allow the lowering of the operating tool when the operating tool is in a rotational position other than the specific rotational position with respect to the operating tool mounting member. The functions and effects are as follows.

[Effect]

By raising and lowering the operating tool while keeping it at a rotational position other than the specific rotational position with respect to the operating tool mounting member, the operating tool can be brought to the raised usage position or engaged with the locking tool in the lowered storage position. It will be in a state where it matches.

By setting the operating tool in the raised use position to the specific rotation position and using the receiving part on the protrusion, the operating step uses the receiving part to support the operating tool so that it does not descend from the raised use position. .

[Effect of idea]

By switching the operating tool to the lower storage position and engaging the locking tool in this storage position, the operating tool can be stored below the operating step and can be used as a member for locking the interlocking mechanism, Work during normal times can be done easily by using a wide range of operation steps, and can be done safely because the control valves are not operated unexpectedly.

By simply raising and lowering the operating tool, the device can be switched between the operating state and the storage lock state, which simplifies the switching operation and provides excellent operability.

Furthermore, by being able to hold the operating tool in the raised operating position using the operation step, it is no longer necessary to always support the operating tool to prevent it from descending due to its own weight, making it easier to operate the work equipment using the operating tool. Moreover, it is possible to simplify the structure so that no special holding member is required, which is advantageous from an economic point of view. I was able to easily see the situation and was able to make it easy to operate in this aspect as well.

〔Example〕

As shown in FIG. 7, a crawler-type traveling body 2 having a dozer working device 1 is rotated by a hydraulic motor 6 on a swivel platform 5 equipped with a control section 3 and a driving section 4. At the same time, a backhoe working device 7 is attached to the swivel table 5 so as to be oscillated around the vertical axis P1 by a hydraulic cylinder ₈ , and both earth removal work and excavation work can be performed. The work vehicle is configured as follows.

As shown in FIG. 5, a potentiometer 10 is connected to an operating lever 9 for the swivel base 5.
is linked to an electromagnetically operated proportional control valve 12 of the hydraulic motor 6 via a microcomputer 11. The microcomputer 11 is linked to a setting device 13 for setting the angle of the swivel base 5 relative to the traveling body 2 at which it is to be stopped, and a sensor 14 that detects the angle of the swivel base 5 relative to the traveling body 2. 12a determines whether or not the swivel base 5 should be rotated based on the information from the potentiometer 10, and whether the direction in which the swivel base 5 should be rotated is left or right. The control section 12b sets a program for driving the swivel base based on the information from the setting device 13 and stores it in the storage section 12c. The proportional control valve 12 is configured to be automatically operated. The program causes the proportional control valve 12 to be operated and the opening degree to be adjusted so that the swivel table is operated in a state where the drive speed Vθ is a function of the aircraft angle θ relative to the vehicle as shown in FIG. . In other words, when the angle θ of the aircraft relative to the vehicle changes from the angle θ _s at the start of rotation toward the angle θ _f that should be exhibited, and when the stopping angle θ _f approaches the set value, the aircraft decelerates. Therefore, when the angle θ _p exceeds the stopping angle θ _f , the vehicle returns to the stopping angle θ _f without decelerating as the stopping angle θ _f approaches the set value.

In short, just by performing a starting operation by operating the operating lever 9, the swivel base 5 automatically moves to the operating lever 9.
It is driven while being automatically adjusted in the rotational direction according to the direction of operation, and is automatically stopped when the set angle θ _f of the aircraft relative to the vehicle is reached.

The proportional control valve 12, as shown in FIG.
Main valve 15 and this main valve 15
A pair of electromagnetically operated proportional pressure reducing valves 1 that are hydraulically operated.
6, 17, etc., and a pair of proportional pressure reducing valves 1
6 and 17 are configured to be operated by the microcomputer 11.

A second proportional pressure reducing valve 16, 17,
Manual override section 16 as shown in the figure.
a or 17b is biased to the neutral position, and the pair of manual override parts 16a and 17a have an interlocking mechanism 19 which is shielded and arranged below the operation step 18 as shown in FIG. The operating tool 20 is interlocked via the . The interlocking mechanism 19 is connected to the proportional pressure reducing valve 1.
6 and 17, a valve operating piece 23 is attached to swing through a fixture 21 and a rotating shaft 22, and a leaf spring 2 extends from the rotating shaft 22 so as to be integrally rotatable.
4. Support member 25 for the proportional pressure reducing valves 16 and 17
a swinging link 29 mounted to swing via a supporting shaft fixture 26, a supporting shaft 27, and a rotating cylinder shaft 28;
and an operating tool mounting member 30 that is integrally rotatably attached to the upper end side of the rotary cylinder shaft 28 so as to swing around the vertical axis P ₂ of the support shaft 27. 30 is operated to swing, the swing link 29 swings around the vertical axis _P2 , and a pair of pin portions provided to engage and interlock with the free end side of the leaf spring 24. 29a, 29b to swing the leaf spring 24, the valve operating piece 23 swings around the axis of the rotating shaft 22, and the pair of manual override parts 16a,
17a is selectively pressed, and the assembly error between the assembly position on the valve operation piece 23 side and the assembly 1 on the operating tool mounting member 30 side is adjusted by the plate spring 2.
It is constructed so that it can be absorbed by the deformation of 4.
The operating tool 20 is attached to the boss portion 30a of the operating tool mounting member 30 so as to be able to slide up and down and rotate. , by raising and lowering it, the upper end side protrudes upward from the operating step 18 as shown in FIG. As shown in FIG. 1, a pair of projections 20
a, 20b and a lowered and retracted position where they are received and supported by the boss portion 30a, and the backhoe working device 7 can be automatically rotated by the microcomputer 11. In some cases, the operating tool 20 can be stored below the operation step 18 so as not to become an obstacle, so that when a failure occurs in the electrical system and the automatic turning operation becomes impossible, the operating tool 20
to the above-mentioned raised use position and the above-mentioned vertical axis center P ₂
The pair of manual override parts 16a and 17a can be operated by swinging around the backhoe, and the backhoe working device 7 can be rotated manually.

As shown in FIG. 1, a locking device 32 for the interlocking mechanism 19 is attached to the spindle fixture 26. The locking tool 32 is configured such that when the operating tool 20 is operated to the lowered storage position, the lower end of the operating tool 20 is fitted and engaged as shown in FIG. It is disposed below the operating tool mounting member 30 and connected to the operating tool mounting member 30 via the engaged operating tool 20 so as to be detached as shown in FIG. The interlocking mechanism 19 is configured to be fixed inoperably by the action.
That is, in order to fix the interlocking mechanism 19 so as to prevent the interlocking mechanism 19 from operating due to aircraft vibration and operating the proportional pressure reducing valves 16 and 17,
The operating tool 20 in the stored state is used.

The operating tool 20 in the raised use position is rotated with respect to the operating tool mounting member 30, and as shown in FIG. When the operating step 18 is operated to the rotation position, the step portion 18 located on the front and rear sides of the operating tool insertion/extraction opening 31 of the operation step 18
a, 18a come into contact with the protrusion 20a to receive and support the operating tool 20 in the raised use position, and the protrusion 20a is placed on the side of the swivel base 5 as shown in FIG. When operated to a second rotational position along or approximately along the direction, the protrusion 2
The operation tool insertion/removal opening 31 is formed so that the step portion 18a will be in a state where the operation tool 20 can be lowered by removing the operating tool 0a. That is, by operating the operating tool 20 to the first rotational position, the operating tool 20 can be supported by the operation step 18 so as not to fall under its own weight from the raised use position.

Cotter pin protrusion 20 shown in FIGS. 1 and 3
b prevents the operating tool 20 from coming off upward from the operating tool mounting member 30 by coming into contact with the boss portion 30a.

[Another Embodiment] A logic circuit configuration may be adopted instead of the microcomputer 11, and these are collectively referred to as the electric control mechanism 11.

The present invention can be applied to an operation configuration for raising and lowering the backhoe working device 7 in addition to turning it, and also to various earthmoving vehicles equipped with a face shovel working device, an earth breaker, etc. in addition to the backhoe working device 7. The backhoe work device 7 is referred to as a ground work device 7, and the hydraulic motor 6 is referred to as a hydraulic actuator 6 for raising and lowering or turning the work device.

Operation step 18 in which the operating tool 20 is raised to the use position
In addition to directly acting on the step portion 18a, the protrusion 2
A configuration may be adopted in which a member forming an acting part for the actuator 0a is attached to the operation step 18, and the step part 18a is referred to as a receiving part 18a.

When the operating tool 20 is arranged to operate the valve by swinging in the front-rear direction of the swivel base, the operating tool is attached to the operating tool mounting member 30 so that the protrusion 20a is in a rotational position along the lateral direction of the swivel base. The first rotational position may be referred to as a specific rotational position, and the second rotational position may be referred to as a rotational position other than the specific rotational position.

[Brief explanation of the drawing]

The drawings show an embodiment of the structure of the operation part for the working device in the earthmoving vehicle according to the present invention, FIG. 1 is a partially cutaway side view of the interlocking mechanism, FIG. 2 is a plan view of the interlocking mechanism, and FIG. 3 is a cross-sectional view of the interlocking mechanism. FIG. 4 is a side view of the operating tool in the raised position; FIG. 4 is a plan view of the operating tool in the raised use position; FIG.
The figure is a hydraulic circuit diagram, FIG. 6 is an explanatory diagram of the speed governor, and FIG. 7 is a side view of the entire working vehicle. 6...Hydraulic actuator, 7...Ground work device, 11...Electric control mechanism, 12...Solenoid control valve, 16a, 17a...Manual override part, 18...Driving step, 18a...Receiving part , 19... Interlocking mechanism, 20... Operating tool, 20a
...Protrusion, 30...Operation tool mounting member, 32...
...Lock tool, P ₂ ...Vertical axis center.

Claims (1)

[Scope of utility model registration request] An electric control mechanism 11 is provided to automatically operate the electromagnetic control valve 12 for the hydraulic actuator 6 for lifting or turning the ground work device 7, and the manual override portions 16a, 17a of the electromagnetic control valve 12 and the manual override This is a structure of an operation part for a working device in an earthmoving vehicle in which an interlocking mechanism 19 of an operating tool 20 with respect to parts 16a and 17a is shielded and arranged below an operation step 18, and the operating tool mounting member 30 constituting the interlocking mechanism 19 is vertically mounted. It is mounted so as to swing around the axis _P2 , and can be freely moved up and down between a raised use position where the upper end side protrudes upward from the operation step 18 and a lowered storage position where it is retracted below the upper surface of the operation step 18. The operating tool 20 is slidably attached to the operating tool mounting member 30, and the operating tool 20 includes a locking tool 32 that engages with the operating tool 20 and fixes the interlocking mechanism 19 inoperable. detached by being operated to the raised use position;
and a receiving portion 18a that is disposed so as to be engaged when the operating tool 20 is operated to the lowered storage position and acts on the protrusion 20a of the operating tool 20 to support the operating tool 20 in the raised use position. acts when the operating tool 20 is at a specific rotational position relative to the operating tool mounting member 30, and when the operating tool 20 is at a rotational position other than the specific rotational position relative to the operating tool mounting member 30. The structure of the operation part for a working device in an earthmoving vehicle is prepared for the operation step 18 in a state in which the operation tool 20 is formed to allow the lowering of the operation tool 20 when the earthmoving vehicle is in the position.