JPS6235922Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a hydraulic circuit that controls a plurality of hydraulic devices.

Conventionally, in order to control multiple hydraulic devices, it has been known to provide a control valve that supplies pressure oil to each hydraulic device, and to switch each control valve with a control lever to supply hydraulic pressure to each hydraulic device. ing.

However, this hydraulic circuit requires the same number of operating valves as the hydraulic equipment, and therefore requires the same number of operating levers as the hydraulic equipment, making the control operation extremely troublesome.

For this reason, the operation of a hydraulic working machine operated by multiple cylinders, such as a hydraulic excavator, becomes troublesome, which is not preferable.

The present invention was developed in view of the above circumstances, and its purpose is to create a hydraulic circuit for multiple hydraulic devices that can supply pressure oil to each hydraulic device individually by using fewer operating valves than the number of hydraulic devices. It is to provide.

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

Figure 1 is a front view of the mechanical finger clamp, Figures 2 and 3 are right and left side views, and the main body 1 has a clamp claw 2 on one side and a pair of clamp claws 3 on the other side. are provided facing each other so that they can be opened and closed freely.

Each clamp claw 2 and 3 has a base 2 which is pivotally connected to the main body 1.
₁ , 3 ₁ , 3 ₁ and tip portions 2 ₂ , 3 ₂ , 3 ₂ pivoted to the base portions 2 ₁ , 3 ₁ , 3 ₁ , the base portions 2 ₁ ,
3 ₁ , 3 ₁ are swung by first cylinders 4 ₁ , 5 ₁ on both sides, and tips 2 ₂ , 3 ₂ , 3 ₂ are swung by second cylinders 4 ₅ , 5 ₂ on both sides.

The main body 1 is rotatably mounted on a mounting body 6,
It is driven to swing by a swing motor 7.

The mounting body 6 is vertically swingably connected to an arm 8 mounted on a vehicle body (not shown) so as to be vertically swingable.
Piston rod 10 of cylinder 9 pivotally connected to arm 8
is connected to the mounting body 6 via a link 11.

FIG. 4 is a longitudinal sectional view of the operating rod 12, and FIG. 5 is a plan view. At the upper part of the rod body 13, there is a grip portion 14 and first and second partition walls 15 and 1 that cover both sides of the grip portion 14.
6 are integrally formed to constitute spaces 17 and 18.

First and second up and down switches 19 ₁ , 20 ₁ , 19 are provided on both sides 14 a and 14 b of the grip portion 14 .
₂ and 20 ₂ are provided with vertically shifted positions, and the opposing surfaces 15a and 16a of the first and second partition walls 15 and 16
The third and fourth up and down switches 21 ₁ , 22 ₁ , 2
1 ₂ and 22 ₂ are provided in vertically shifted positions, and fifth and sixth switches 23 and 24 are provided on the left and right walls 15b and 15c of the first partition wall 15, respectively.

Then, the operator moves the two fingers a of hand A into the first space 17 as shown by the imaginary lines in FIGS. 6 and 4.
Then, the user operates the operating rod 12 by gripping the grip portion 14 with the thumb b facing the second space 18.

FIG. 7 is a hydraulic circuit diagram, in which the first to fourth solenoid valves 31 to 34 are connected in parallel to the discharge path 30 of the pump P, and the first solenoid valve 31 is connected to the first and second paths 35 and 3.
6, the second solenoid valve 32 and the third solenoid valve 33 are connected to the third and fourth passages 37 and 38, and the fifth and sixth passages 3.
9 and 40, the fourth solenoid valve 34 supplies pilot pressure oil to the first and second pilot passages 41 and 42, and the first passage 35 supplies pilot pressure oil to the first and second auxiliary passages 43. ₁ , 43 ₂ to the extension chambers 5 _1a , 5 _2a of the first and second other cylinders 5 ₁ , 5 ₂ , and the second passage 36 , third passage 37 , and fourth passage 38 are similarly connected to Reduction chambers 5 1b , 5 of each cylinder 5 ₁ , _{5 2} , 4 ₁ , 4 ₂ via 3rd to 8th auxiliary passages 43 ₃ to 43 _8
2b , extension chambers _41a , _42a , and contraction chambers _41b , _42b, respectively, and the fifth and sixth passages 39, 40 are connected to forward/reverse ports 7a, 7b of the swing motor 7. .

Each of the auxiliary passages 43 is provided with first to eighth pilot check valves 44 ₁ to 44 ₈ , respectively, and each pilot check valve 44 prevents outflow to the tank T, and when pilot pressure is supplied, the pilot check valves 44 block the outflow to the tank T.
Allow leakage to.

Then, from the first pilot path 41, the first, fourth, fifth, and eighth pilot check valves 44 ₁ , 4
Pilot pressure is supplied to 4 ₄ , 44 ₅ , 44 ₈ , and the second, third, sixth and seventh pilot check valves 44 ₂ , 44 ₃ ,
Pilot pressure is supplied to ₄₄₆ and ₄₄₇ .

Next, the details of each part will be explained along with the operation.

When the operating rod 12 is not operated, each of the solenoid valves 31 to 34 is at the neutral position N shown in the figure, and the discharge passage 30 of the pump P is at the neutral position N of the fourth solenoid valve 34.
It communicates with the drain passage 45, and each cylinder 4 and 5
doesn't work.

Bend the tips of fingers a and b (that is, the part beyond the first joint) inward and press the first lower switch 1.
9 ₂ and the second lower switch 20 ₂ are turned on, the first solenoids 31 a, 32 a, 34 of the first and second solenoid valves 31 and 32 and the fourth solenoid valve 34 are turned on.
a is excited and assumes the first position.

For this reason, the discharge pressure oil of the pump P is transferred to the first path 3.
5→first auxiliary path 43 _second cylinder 5 on the other side from 1
It is supplied to the extension chamber _52a of _{the second} cylinder 42 on one side from the third passage 37→fifth auxiliary passage ₄₃₅ , and is supplied from the first pilot passage 41 to the extension chamber ₄₂ of the second cylinder 42 on one side. Since the pilot pressure is supplied to the 4th, 5th, and 8th pilot check valves 44 ₁ , 44 ₄ , 44 ₅ , _{44 8} , the reduction chambers 5 _{2 b} and 4 _{2 b} of each of the cylinders 5 ₄ , 4 8 are・
8th auxiliary passage 43 ₃ , 43 ₅ → 4th and 8th pilot check valves 44 ₄ 44 ₈ → 2nd passage 36 .
The fourth path 38 is connected to the drain path 45 .

Therefore, the second cylinder ₅₂ on the other side and the second cylinder ₄₂ on the one side extend, and the clamp claw 3 on the other side expands.
The tip 32 of the clamp claw ₂ and the tip ₂₂ of the one side clamp claw 2 rotate inward.

At this time, pressure oil is also supplied to the extension chambers 5 _1a and 4 _1a of the other side first cylinder 5 ₁ and the negative side first cylinder 4 ₁ through the second and sixth auxiliary passages 43 ₂ and 43 ₆ . , the third and seventh pilot check valves 44 ₃ and 44 ₇ of the third and seventh auxiliary passages 43 ₃ and 43 ₇ connected to the reduction chambers 5 _1b and 4 _1b are not supplied with pilot pressure and oil is not supplied. Since the outflow is prevented, the first cylinder ₅₁ on the other side and the first cylinder ₄₁ on the one side do not operate at all.

When the bases of fingers a and b (front side of the first joint) are bent inward and the first upper switch ₁₉₁ and the second upper switch ₂₀₁ are turned on, the first and second solenoid valves 31 and 32 are activated as described above. Similarly, the fourth solenoid valve 34 is in the first position, and the second solenoid 34b is excited, and the fourth solenoid valve 34 is in the second position. 7th pilot check valve 44 ₂ ,
44 ₃ , 44 ₆ , 44 ₇ as pilot pressure, the other side first cylinder 5 ₁ and one side first cylinder 4 ₁ expand, and the base 3 ₁ of the other side clamp claw 3 expands as described above. Then, the base ₂₁ of the one-side clamp claw 2 rotates inward.

Bend the tips of fingers a and b outward (open them) and press the third lower switch ₂₁₂ and the fourth lower switch 22.
₂ is turned on, the first and second solenoid valves 31 and
32 second solenoids 31b and 32b are energized and set to the second position, and the first solenoid 34a of the fourth solenoid valve 34 is energized and set to the first position, so that the discharge pressure oil of the pump P is energized and set to the second position. 4
36 and 38 and a first pilot path 41.

For this reason, as described above, the second cylinder ₅₂ on the other side and the second cylinder ₄₂ on the one side are contracted,
The tip 32 of the other side clamp claw ₃ and the tip ₂₂ of the one side clamp claw 2 swing outward (opening operation).

Bend the bases of fingers a and b outward (open them) and press the third upper switch ₂₁₁ and the fourth upper switch 22.
When ₁ and 1 are turned ON, the 1st, 2nd, and 4th solenoid valves 3
1, 32, and 34 are in the second position, and the first cylinder ₅₁ on the other side and the first cylinder ₄₁ on the one side contract in the same manner as described above, and the base 31 of the clamp claw 3 on the other side and the first cylinder ₄₁ on the other side contract. The base ₂₁ of the clamp claw 2 swings outward (expands).

Move finger a to the left and turn the fifth switch 23.
When turned ON, the first solenoid 33a of the third solenoid valve 33 is excited and becomes the first position, and the oil discharged from the pump P is supplied from the fifth passage 39 to the normal rotation port 7a of the swing motor 7 to drive the rotation motor 7 in the normal rotation. Main body 1
Turn left.

Move finger a to the right and turn the sixth switch 24.
When turned ON, the second solenoid 33b of the third solenoid valve 33 is energized to the second position, and the discharge pressure oil of the pump P is supplied from the sixth passage 40 to the reverse rotation port 7b of the swing motor 7 to drive the rotation motor 7 in the reverse direction. Turn 1 to the right.

In this way, the clamp claws 2 and 3 on both sides move in a similar manner to the movements of fingers a and b, so the mechanical finger clamp can be easily operated with one hand.

In addition, if each switch is a so-called touch key that turns the electric circuit on and off with a slight pressing force from the fingertip, operator fatigue will be reduced even after long periods of operation.

The present invention is as described above, and by switching the first, second, and third operating valves, the first and second one-side cylinders and the first and second other-side cylinders can be extended. Since four cylinders can be operated, the structure is simple and the operation of the control valve is also simple.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention.
The figure is a front view of the mechanical finger clamp,
Figures: Figure 3 is a right side view, left side view, Figure 4 is a sectional view of the operating lever, Figure 5 is a plan view, Figure 6 is a plan view showing the gripping state of the operating lever, and Figure 7 is the hydraulic pressure. It is a circuit diagram.

Claims (1)

[Scope of utility model registration request] The supply of pressure oil from the hydraulic source P to the first passage 35 and the second passage 36 is controlled by the first operation valve, and the first passage 3
5 into the first and second auxiliary roads 43 ₁ and 43 ₂ ,
The first auxiliary passage ₄₃₁ is connected to the extension chamber _{52a of} the second other cylinder ₅₂ , and the second auxiliary passage ₄₃₂ is connected to the extension chamber _51a of the first other cylinder 51. road 36 as the third and fourth auxiliary road 43 ₃ ,
₄₃₄ , the third auxiliary passage ₄₃₃ is connected to the reduction chamber _51b of the first other cylinder ₅₁ , and the fourth auxiliary path ₄₃₄ is connected to the reduction chamber ₅ of the second other cylinder 52. _2b
The pressure oil from the pressure oil source P is controlled to be supplied to the third passage 37 and the fourth passage 38 by the second operation valve, and the third passage 37 is connected to the fifth and sixth auxiliary passages 43. ₅ , 43 ₆ , and its fifth auxiliary road 4
3 ₅ to the extension chamber 4 _2a of the second one-side cylinder 4 ₂ and a sixth auxiliary passage 43 ₆ to the extension chamber 4 _1a of the first one-side cylinder 4 1 _.
is branched into seventh and eighth auxiliary passages 43 ₇ and 43 ₈ , and the seventh auxiliary passage 43 ₇ is connected to the first one side cylinder 4 ₁
The eighth auxiliary passage ₄₃₈ is connected to the contraction chamber _41b of the second one-side cylinder ₄₂ , and the first to _eighth pilot check valves ₄₄₁ are connected to each of the auxiliary passages. _-448 are provided, and the first, fourth, fifth, and eighth pilot check valves _441,4 are provided.
4 ₄ , 44 ₅ , 44 ₈ are connected to the first pilot passage 41 , and the second, third, sixth, seventh pilot check valves 44 ₂ , 44 ₃ , 44 ₆ , 44 ₇ are connected to the second pilot passage 42 . At the same time, the pressure oil of the hydraulic source is connected to the first and second pilot passages 41 and 4 using the third operating valve.
2. A hydraulic circuit for a plurality of hydraulic devices, characterized in that supply control is performed on multiple hydraulic devices.