JPH06257183A - Hydraulic pilot type operation device for excavator - Google Patents

Abstract

PURPOSE:To enable the check and repair of an engine or the like to be under taken in a safe condition with an excavation work section kept in contact with the ground, by arranging a pilot pump interlocked with the engine at the intermediate section of a pilot hydraulic pressure circuit, and providing a hydraulic pressure supply and discharge device for forcibly generating hydrau lic pressure independent of the engine. CONSTITUTION:The base end 27a of a hydraulic hose 27 for a supply and discharge device is connected to the intermediate section of a pilot hydraulic pressure circuit R, and the delivery side of an electric pump P2 is connected to the terminal end 27b of the hose 27 via a nonreturn valve 28 for the supply and discharge device. Then, the base end 29a of an intake hydraulic pressure hose 29 is connected to the intake side of the pump O2, and the terminal end 29b thereof is connected to a hydraulic pipe 26 laid between a pilot pump P1 and a hydraulic fluid tank T. When an engine (e) stops for some reason during an excavation work and an excavation work section (b) stops above the ground level, the section (b) cannot be lowered, even if control levers 16 and 16 are operated. In this case, an operator can easily lower the section (b) to the ground via the operation of a control switch S.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic pilot type operating device for an excavating work machine in which a hydraulic actuator can be forcibly operated even when the hydraulic pump is stopped due to engine trouble or the like.

[0002]

2. Description of the Related Art Conventionally, in an excavator or the like, a hydraulic pump and a hydraulic actuator are connected via a control valve, and the control valve controls the operation of the hydraulic actuator. A remote control valve is arranged at the base end so as to interlock with the front, rear, left and right movements of the operation lever, and the remote control valve and the control valve are connected by a pilot hydraulic path to pilot the operation of the control valve. There is a hydraulic pilot operated device configured to operate hydraulically.

This is different from a mechanical operating device in which an operating lever and a control valve are connected by a link mechanism or the like, and neither rusting nor rattling occurs, and moreover, a delicate operation of an excavation work section can be easily performed. Is something that can be done.

[0004]

However, the hydraulic pilot type operating device described above has the following problems to be solved.

That is, in general, when the engine is stopped due to an engine failure or the like during the operation of the excavator, the hydraulic pump is interlocked with the engine, and the excavator is also stopped at the same time. It will be done.

Therefore, when the boom or the like of the excavation work section is above the ground, it remains stopped at that position.

If the control valve and the operation lever are mechanically connected to each other, the control valve is operated by moving the operation lever, and the hydraulic pressure is released to lower the boom or the like by its own weight. You can

However, in the case of the pilot hydraulic excavating work machine described above, the operating lever and the control valve are hydraulically routed via a hydraulic pump interlocking with the engine or, similarly, a pilot hydraulic pump interlocking with the engine. Since it was connected, the engine was stopped and hydraulically locked, and even if the operation lever was moved, the hydraulic pump did not operate, so the excavation work section could not be operated and lowered.

In this case, the excavation work machine must be inspected and repaired with the boom and the like positioned above, and moreover, the boom and the like may fall naturally over time, which is very dangerous.

Further, for example, when it is necessary to replace the piping or the like at the time of inspection / repair, there is a possibility that the hydraulic oil may be ejected at a high pressure because the hydraulic pressure acts on the piping. It was extremely dangerous.

An object of the present invention is to provide a hydraulic pilot type operating device for an excavating work machine which can solve the above-mentioned problems.

[0012]

According to the present invention, a hydraulic pump and a hydraulic actuator are connected via a control valve, the operation of the hydraulic actuator is controlled by the control valve, and the control valve and the operating lever are interlocked. While connecting with the remote control valve,
In a hydraulic pilot type operating device for an excavating work machine that is provided in the pilot hydraulic path and configured to operate the control valve by pilot hydraulic pressure, a pilot pump that interlocks with the engine is arranged in the middle of the pilot hydraulic path. A hydraulic pilot type operating device for an excavating work machine, which is provided with a hydraulic pressure supply / discharge device forcibly generating hydraulic pressure independently of the engine.

Further, according to the present invention, the hydraulic pressure supply / discharge device comprises an electric pump using a battery as a power source and an operation switch of the electric pump, and the hydraulic supply / discharge device can be manually operated. It is also characterized in that it is composed of a drive pump and an operating means of the drive pump.

[0014]

Embodiments of the present invention will be specifically described below with reference to the accompanying drawings.

(First Embodiment) FIG. 1 is a side view of an excavating work machine B equipped with a hydraulic pilot type operating device C according to the present invention, and FIG. 2 is an explanatory view showing a control section 5 of the excavating work machine B. FIG. 3 is an explanatory view showing a hydraulic circuit of the hydraulic pilot type operating device C.

In the excavator B, as shown in FIG. 1, a machine frame main body 3 is rotatably attached to a central portion of a crawler type traveling device 1 via a slewing bearing 2, and at the same time, a central portion of the machine frame main body 3 is attached. A cabin 4 is provided, and an excavation work section b is attached to the front side of the machine frame body 3. Reference numeral e denotes an engine arranged in the rear portion of the machine frame body 3.

A control section 5 is provided inside the cabin 4, and a driver's seat 6 is disposed in the control section 5, and control boxes 1 are provided on both sides of the driver's seat 6 as shown in FIG.
5, 15 are arranged, armrests 19, 19 are provided on the upper part of the control boxes 15, 15, and operation levers 16, 16 are attached to the left and right in front of the armrests 19, 19, respectively.

Reference numerals 17 and 17 denote travel levers provided on the front side of the driver's seat 6, reference numeral 20 denotes a meter box provided in front of the control box 15 on the right side, and 24 safety levers.

On the other hand, the excavation work part b is provided with a boom bracket mounting fulcrum 7 at the front part of the machine frame body 3, and a boom bracket 8 is rotatably mounted on the bracket 8 at the mounting fulcrum 7. The main boom 9 is mounted so as to be able to move up and down, and a bucket arm 10 and an excavation bucket 11 are connected to the tip of the main boom 9 via hydraulic actuators a, respectively.

The hydraulic actuator a comprises a main boom cylinder 12, a bucket arm cylinder 13, a bucket cylinder 14 and a hydraulic motor m for turning the machine frame body 3, each of which is a hydraulic pump interlocked with an engine e. It is connected to P by a hydraulic pipe via a control valve 18 arranged below the cabin 4.

In FIG. 1 and FIG. 2, reference numeral 21 denotes a blade having a soil discharging operation and a stabilizer function, and 22 denotes the blade 21.
It is an operating cylinder for moving up and down.

The excavator B having the above-mentioned structure is equipped with a hydraulic pilot type operating device C, which controls the operation of the hydraulic actuator a by operating the operating levers 16 and 16 provided on the control section 5. The pilot operated control valve 18 is used.

That is, as shown in FIG. 3, a remote control valve is provided at the base end of the operating lever 16 in four directions, front, rear, left and right.
23 are arranged in interlocking operation with the front, rear, left, and right of the above-mentioned base end portion, and the remote control valve 23 has an input side having a P port 31 communicating with the pilot pump P ₁ side and a hydraulic oil tank T side. There is a T port 32 in communication with.

On the other hand, on the output side of each remote control valve 23,
A V port 33 communicating with the pilot pressure receiving portion 18a of the pilot operated control valve 18 is provided. In addition,
Reference numeral 26 is a hydraulic hose that serves as a flow path for hydraulic oil.

As described above, the pilot pump P ₁ and the remote control valve provided in association with the operation levers 16 and 16
23 and the control valve 18 are connected by a hydraulic hose 26, and these constitute a pilot hydraulic path R.

By the way, in the hydraulic circuit, the control valve 18 disposed below the cabin 4 includes the hydraulic pump P and the hydraulic actuators a, that is, the main boom 9,
It is provided between the main boom cylinder 12 for operating the bucket arm 10 and the excavation bucket 11, the bucket arm cylinder 13, the bucket cylinder 14, and the turning hydraulic motor m of the machine frame body 3. become.

When the pilot oil pressure from the remote control valve 23 acts on the pilot pressure receiving portion 18a of the control valve 18, the control valve is driven by the fluid pressure.
The 18 spools are operated to switch the oil passage to operate the hydraulic actuator a.

The basic construction of the whole excavating work machine B in this embodiment is as described above, and the gist of the present invention is as follows.
The pilot pump P ₁ interlocking with the engine e is arranged in the middle of the pilot hydraulic path R, and a hydraulic pressure supply / discharge device A for forcibly generating hydraulic pressure independently of the engine e is provided. . In the present embodiment, the hydraulic pressure supply / discharge device A includes an electric pump P ₂ that uses a battery 30 as a power source, and an operation switch S of the electric pump P ₂ .

That is, as shown in FIG. 3, in the middle of the pilot hydraulic path R, the base end 27a of the hydraulic hose 27 for the supply / discharge device is connected between the pilot pump P ₁ and the remote control valve 23. The discharge side of the electric pump P ₂ is connected to the terminal end 27b of the hose 27 via a check valve 28 for a supply / discharge device. Then, on the suction side of the electric pump P ₂ , the base end of the suction hydraulic hose 29 is
29a and its end 29b to the pilot pump P ₁
And a hydraulic oil tank T are connected to a hydraulic pipe 26a.

An electric motor M is connected to the electric pump P ₂ , and the electric motor M is connected via an operation switch S to a battery 30 as a power source.

In this embodiment, the operation switch S
Is provided in the control unit 5 so that the driver can easily operate in an emergency such as engine trouble.
Is arranged near the engine e to facilitate normal maintenance. However, the installation location is not particularly limited. In FIG. 3, 25 is a check valve for pilot hydraulic pressure, and 39 is a relief valve.

With the above construction, when the engine e is stopped for some reason during the excavation work and the excavation work part b is stopped at a position higher than the ground surface, the operation levers 16, 16 and the control valve hydraulic pump P interposed between the 18, because the pilot hydraulic pump P ₁ is linked to the engine e, a state in which hydraulic pressure is locked together with the engine stop, excavation work unit or moving the operating lever 16, 16 Although b cannot be lowered, the driver can easily lower the excavation work part b to the ground surface by operating the operation switch S.

Therefore, it is possible to promptly avoid a dangerous state in which the excavation work section b is stopped upward, and the engine e etc. is operated in a safe state in which the excavation work section b is grounded on the ground surface. Can be inspected and repaired.

(Second Embodiment) FIG. 4 shows another embodiment of the hydraulic pilot type operating device C in the excavating work machine according to the present invention. Unlike the example, the hydraulic pressure supply / discharge device A is composed of an accumulation circuit F and an opening / closing cock 38. In addition, in the present embodiment, the same reference numerals are used for the same constituents as the previous embodiment.

That is, as shown in FIG. 4, a hydraulic oil hose 26 connecting the pilot pump P ₁ and the remote control valve 23 is provided with a parallel oil passage 34 in parallel in the middle of the pilot hydraulic pressure path R. The relief valve 35 is attached to the parallel oil passage 34, and the accumulator 37 is inserted via the check valve 36 into the branch oil passage 37a branched from the upstream side of the relief valve 35.
Is attached to form an accumulation circuit F.

The accumulator 37 is connected to the hydraulic hose 27 for connecting the pilot pump P ₁ and the remote control valve 23 by the hydraulic hose 27 for the supply / discharge device. An opening / closing cock 38 and a check valve 28 for the supply / discharge device are arranged on the hydraulic hose 27 for the supply / discharge device from the accumulator 37 side.

The hydraulic pilot type operating device C having the above structure
Normally, the open / close cock 38 is closed, and in such a state, the hydraulic oil from the pilot pump P ₁ flows to the remote control valve 23 and also to the accumulation circuit F at the same time, and passes through the check valve 36. Flow into the accumulator 37,
With the spring provided in the accumulator 37,
It is stored in the accumulator 37 at a preset pressure.

When the set pressure is reached, the working oil flowing in the accumulation circuit F is switched in the flow path by the relief valve 35 and returned to the working oil tank T.

With the above structure, when the engine e is stopped for some reason during the excavation work and the excavation work part b is stopped at a position higher than the ground surface, the opening / closing cock 38 is opened to operate the accumulator 37. Oil remote control valve 23
Flow to the remote control valve 23 by fluid pressure, and the control valve 18 can be operated so as to lower the excavation work part b.

(Third Embodiment) Next, as another embodiment,
Drive pump P that can manually operate the hydraulic pressure supply / discharge device A
₃ and a hand lever 41 for operating the pump P _3.
The one configured by and will be described.

By the way, in the present embodiment, the excavating work machine B shown in FIG. 6 is used.
Differences from the embodiment will be described later in detail. The same reference numerals are used for the same constituents as those in the first and second embodiments.

As shown in FIG. 5, the hydraulic pressure supply / discharge system A according to the present embodiment has a hydraulic pressure supply / discharge path 42 between the pilot pump P ₁ and the remote control valve 23 in the middle of the pilot hydraulic pressure path R. Is connected to the base end 42a thereof, and the drive pump P ₃ is disposed at the terminal end 42b of the supply / discharge hydraulic path 42.

The drive pump P ₃ can be manually operated, and a hand lever 41 is detachably attached to the rotary shaft of the pump P ₃ .

The location of the drive pump P ₃ is as follows.
There is no particular limitation as long as the pump P ₃ can be artificially rotated by the hand lever 41 described above.

Further, the drive pump is not limited to the one using the hand like the hand lever 41, but may be a foot-operated type, a foot-operated type or the like.
Anything that allows manual rotation of P ₃ can be used.

Further, a clutch device or the like is interposed between the pilot pump P ₁ which is interlocked with the engine e and the engine e so as to disconnect the drive transmission between the pilot pump P ₁ and the engine e. The pump P ₁ may also be used as the drive pump P ₃ described above.

Also in the present embodiment having the above-mentioned structure, since the hydraulic pressure of the pilot hydraulic circuit R can be generated at the time of maintenance inspection such as sudden engine stop, the excavation work part b can be lowered. Safety at the time of maintenance can be achieved.

Moreover, no electrical wiring is required, and the safety can be improved without increasing the cost.

Further, as shown in FIG. 6, in this embodiment,
The machine frame main body 3 is formed in a substantially circular shape, and the driver's seat 6 is arranged in the approximate center of the machine frame main body 3.

The control box 15 has a front specification in which it is erected in front of the driver's seat 6. A remote control valve 23 is arranged in the control box 15.

In FIG. 6, 7a is a fulcrum for mounting the boom bracket mounting fulcrum 7 and the boom bracket 8, 16a and 16a are front operating levers erected on the control boxes 15 and 15, and 45 and 45 are operating levers. It's a pedal.

Then, both sides 46a, 46a of the boom bracket mounting fulcrum 7 of the step surface 46 of the control section 5 are extended forward so as not to project at least from the peripheral edge of the machine frame main body 3 and the operation pedals 45, 45 are provided. Also moved forward to widen the driver's feet.

That is, as shown in FIG. 7, the operation pedals 45, 4
The bosses 45a, 45a connected to the lower part of 5 and the shafts 45b, 45b inserted into the bosses 45a, 45a are extended forward.

In FIG. 7, 45c is a fulcrum bracket and 45d is a link ball.

Further, FIG. 8 shows a knob 48 attached to the upper end of the front operating lever 16a.
The knob 48 is divided into two parts, a and a lower body 48b, and a ball-shaped joint 50 provided in the approximate center of the knob 48 allows the knob 48 to be tilted in all directions.

Then, turn the knob 48 so that it is at an arbitrary position.
The upper body 48a can be adjusted in angle and can be fixed with screws 51.

Therefore, the driver and the front operating lever 16a,
The inclination of the knob 48 can be adjusted by the positional relationship with the 16a, and fatigue can be reduced by adjusting to the driving posture of the driver.

Further, as shown in FIG. 9, a pivotal support portion 49 may be provided in place of the ball joint 50 so as to be rotatable. 52 is a fixing screw.

FIG. 10 shows the hose guide cylinder 57 arranged in the cross member 56 of the track frame 55 of the excavator B used in this embodiment.
Also serves as a reinforcement material.

The hose guide cylinder 57 has a more compact shape than the conventional one, and the space around the swivel joint 58 can be increased.

Further, the welding length is short, the number of parts can be reduced, and the cost can be reduced.

Further, the hydraulic hose 61 can be easily inserted between the traveling motor 60 and the swivel joint 58, and the assembling work of the machine can be facilitated. In FIG. 10, reference numeral 62 is a traveling frame,
63 is a rib.

FIG. 11 schematically shows the hydraulic circuit of the sirocco motor 66 provided in the excavating work machine B in this embodiment, in which the oil passage from the hydraulic pump P is separated into two systems and one of the oil passages is separated. A sirocco motor 66 is arranged midway. The sirocco motor 66 is used for cooling the radiator.

An in-line check 67 with a predetermined set pressure is provided on the hydraulic oil discharge side of the sirocco motor 66.
The pressure is taken out as pilot pressure and the control valve 18 is operated. Although the predetermined pressure is set to 30 kg / cm ^{2 in} this embodiment, the numerical value is not particularly limited.

Therefore, conventionally, it was necessary to dispose a pressure reducing valve in the control valve 18, but with this configuration, the pressure reducing valve can be eliminated, and the control valve 18 can be made compact and the cost can be reduced. it can.

When the sirocco motor 66 becomes abnormal, the control valve 18 cannot be operated, and the safety can be improved.

[0067]

According to the present invention, a pilot pump that interlocks with an engine is arranged in the middle of a pilot hydraulic path, and a hydraulic pressure supply / discharge device for forcibly generating hydraulic pressure independently of the engine is provided. Thus, when the engine stops for some reason during the excavation work and the excavation work unit stops at a position higher than the ground surface, the excavation work unit can be lowered to the ground surface.

Therefore, it is possible to promptly avoid a dangerous state in which the excavation work section is stopped upward, and in a safe state where the excavation work section is grounded on the ground surface, the engine, etc. can be checked and checked. Repairs can be done.

Since the hydraulic pressure supply / discharge device is composed of the electric pump using the battery as the power source and the operation switch of the electric pump, the driver can operate the switch promptly and easily. The excavation work section can be lowered.

Further, since the hydraulic pressure supply / discharge device is composed of the manually operable drive pump and the operating means of the drive pump, the safety can be improved without increasing the cost.

[Brief description of drawings]

FIG. 1 is a side view of an excavating work machine including a hydraulic pilot type operating device according to the present invention.

FIG. 2 is an explanatory view of a control part of the excavating work machine.

FIG. 3 is a hydraulic circuit diagram of a hydraulic pilot type operating device according to the present invention.

FIG. 4 is a hydraulic circuit diagram of a hydraulic pilot type operating device according to another embodiment.

FIG. 5 is a hydraulic circuit diagram of a hydraulic pilot type operating device according to another embodiment.

FIG. 6 is a plan view of an excavation work machine according to another embodiment.

FIG. 7 is a sectional side view of an operation pedal.

FIG. 8 is an explanatory diagram of a knob.

FIG. 9 is an explanatory diagram of a modification example of the knob.

FIG. 10 is an explanatory diagram of a track frame.

FIG. 11 is a hydraulic circuit diagram of a sirocco motor.

[Explanation of symbols]

A Hydraulic supply / discharge device P Hydraulic pump P ₁ Pilot pump P ₂ Electric pump P ₃ Drive pump R Pilot hydraulic path S Actuation switch a Hydraulic actuator e Engine 16 Control lever 18 Control valve 23 Remote control valve

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuhiro Ohashi 428 Enami, Okayama City, Okayama Prefecture, Seirei Industry Co., Ltd. (72) Inventor Sumi Yonekura 428, Enami, Okayama City, Okayama Prefecture, Seirei Industry Co., Ltd. (72) Inventor Koji Yamada 428 Enami, Okayama City, Okayama Prefecture Seirei Industry Co., Ltd.

Claims (3)

[Claims] 1. A hydraulic pump (P) and a hydraulic actuator
(a) is connected via a control valve (18), the control valve (18) controls the operation of the hydraulic actuator (a), and it is linked to the control valve (18) and the operating lever (16). In a hydraulic pilot type operating device for an excavating work machine, which is provided in a pilot hydraulic path (R) while connecting to a remote control valve (23) and configured to operate the control valve (18) by pilot hydraulic pressure, In the middle of the pilot hydraulic path (R), the engine (e)
A pilot pump (P ₁ ) interlocking with
A hydraulic pilot type operating device for an excavator, which is provided with a hydraulic pressure supply / discharge device (A) forcibly generating hydraulic pressure independently of the engine (e). 2. The hydraulic pressure supply / discharge device (A) is a battery (30).
The hydraulic pilot type operating device for an excavating work machine according to claim 1, characterized in that the hydraulic pilot type operating device comprises an electric pump (P ₂ ) which uses the electric power as a power source and an operation switch (S) of the electric pump (P ₂ ). 3. The hydraulic pressure supply / discharge device (A) comprises a drive pump (P ₃ ) which can be manually operated, and an operating means for the drive pump (P ₃ ). Hydraulic pilot type operating device for excavator work machine.