JP2934516B2 - Hydraulic switching valve instantaneous switching device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an instantaneous switching device for a hydraulic switching valve applied to a hydraulic control device for a gate, etc.

[0002]

2. Description of the Related Art A conventional switching device for a hydraulic switching valve will be described with reference to FIG.
Is the plunger with cam follower of the hydraulic switching valve 47, 50
Is a rotating shaft of the cam 48, and the rotating shaft 50 and the cam 48 are rotated counterclockwise by an external force ((a) in FIG. 10).
(See (b)), the large-diameter portion of the cam 48 is brought into contact with the plunger 49 with a cam follower, and this is retracted against a spring built in the hydraulic switching valve 47 to switch the hydraulic switching valve 47.
The rotation shaft 50 and the cam 48 are rotated clockwise (see FIGS. 10 (b) → (a)), and the plunger 49 with the cam follower is returned to the original position by the spring built in the hydraulic switching valve 47. I have to.

[0003]

In the conventional switching device for a hydraulic switching valve shown in FIG. 10, the rotation speed of the rotary shaft 50 for performing the switching operation governs the switching speed of the hydraulic switching valve 47. When the rotation speed of the cam 50 is low, the time required from the start of the switching of the cam 48 to the completion of the switching (or the completion of the return from the beginning of the recovery) becomes long.
Becomes neutral. However, the normal hydraulic switching valve 47
Is designed to be used in a state where it is switched to either one, and the following inconvenience may occur due to the function as a valve during the transition during switching.

For example, in the case of a three-way hydraulic switching valve, in a transient state, all three ports are connected as shown in FIG. 9 (b), and the function of the hydraulic switching valve 47 cannot be fulfilled. Is generated. The present invention has been made in view of the above problems, and has as its object the purpose of the present invention is to provide a hydraulic switching system capable of instantaneously performing switching and returning without generating a neutral state even when switching operation is slow. The point is to provide an instant valve switching device.

[0005]

In order to achieve the above object, an instantaneous switching device for a hydraulic switching valve according to the present invention comprises a rotating shaft 16
And the cam shafts 2 and 3 and the rotatable support shafts 11 and 12 are arranged in parallel, the arms 13, 14 and 15 are fixed to the rotating shaft 16, and the cam shaft 2 is brought into contact with the arm 14. 6, the cam 7 that contacts the arm 15 is fixed to the camshaft 3, and the lever 4 that contacts the camshaft 2 and the lever 8 that contacts the arm 13 are fixed to the support shaft 11. The lever 5 that contacts the camshaft 3 with the support shaft 12, the lever 9 that contacts the lever 8, and the hydraulic switching valve 1
And a lever 10 in contact with the fixed, time the support shaft 11
A spring 17 for urging in the measuring direction is provided between the spring 17 and the base 22,
Springs 18, 1 for urging the camshafts 2, 3 in a counterclockwise direction
9 is provided between the base 9 and the base 9.

[0006]

The hydraulic switching valve instantaneous switching device of the present invention is configured as described above, and rotates the rotating shaft 16 in a counterclockwise direction.
The arm 14 is brought into contact with the cam 6, and the cam 6 and the camshaft 2 are rotated clockwise against the spring 18 so that the semicircular cutout of the camshaft 2 faces the tip of the lever 4. The levers 8, 8 and the support shaft 11 are instantaneously rotated clockwise by the spring 17, and the lever 9 pushes the lever 9 counterclockwise to rotate the lever 9, the support shaft 12 and the lever 10 counterclockwise. The lever 10 switches the hydraulic switching valve 1 instantaneously. The counterclockwise rotation of the support shaft 12 rotates the lever 5 in the same direction, separates the lever 5 from the camshaft 3, and rotates the camshaft 3 and the cam 7 counterclockwise by the spring 19.

When the hydraulic switching valve 1 is switched, the rotating shaft 16
Is rotated clockwise, the arm 13 is brought into contact with the lever 8, the levers 8, 4 and the support shaft 11 are rotated counterclockwise against the spring 17, and the lever 4 is separated from the cam shaft 2,
After the cam shaft 2 and the cam 6 are rotated counterclockwise by the spring 18 and the arm 13 is separated from the lever 8, the lever 4
Is brought into contact with the camshaft 2 to hold the lever 8 at the position shown in FIG. 7 (c). Thereafter, the rotation shaft 16 continues to rotate clockwise to bring the arm 15 into contact with the cam 7,
And the camshaft 3 are rotated clockwise so that the semicircular cutout of the camshaft 3 faces the tip of the lever 5.
And the support shaft 12 and the levers 9 and 10 are allowed to rotate freely, and the spool of the hydraulic switching valve 1 is instantaneously returned to the original position by a spring built in the hydraulic switching valve 1.

[0008]

FIG. 1 shows an instantaneous switching device of a hydraulic switching valve according to the present invention.
7 to FIG. 7, an example will be described.
Reference numeral 7 denotes a hydraulic switching valve, FIGS. 1, 2, 5, and 6 denote camshafts, 2 and 3 denote camshafts, 6 denotes a cam fixed to one of the camshafts 2 and 3, and 7 denotes the other camshaft. Cam fixed to 3, 1
Reference numerals 1 and 12 denote support shafts parallel to the camshafts 2 and 3, reference numeral 4 denotes a lever attached to one end of the support shaft 11, reference numeral 8 denotes a lever attached to the other end of the support shaft 11, and reference numeral 5 denotes the support shaft. Lever 9 attached to one end of lever 12 and levers 9 and 10 attached to the other end of the support shaft 12. The tip of the lever 4 contacts the semicircular portion of the camshaft 2 in cross section. Of the cam shaft 3 comes into contact with the semicircular section of the cam shaft 3 and the lever 8
Is in contact with the lever 9, and the lever 10 is in contact with the hydraulic switching valve 1.

Reference numeral 17 denotes a spring interposed between the base protruding portion of the lever 4 and the base 22. The spring 17 biases the lever 4 and the support shaft 11 to rotate clockwise at all times. doing. The 18 by a spring which is interposed between the base end projecting portion and the base 22 of the cam 6, the cam by the spring 18
6 and the camshaft 2 are constantly urged to rotate counterclockwise . Reference numeral 19 denotes a spring interposed between the base protruding portion of the cam 7 and the base 22.
And the camshaft 3 are always urged to rotate counterclockwise.

Reference numeral 23 denotes a bracket for mounting the hydraulic switching valve 1 on the base 22, reference numeral 20 denotes a bearing for rotatably supporting the camshafts 2, 3 on the base 22, and reference numeral 21 denotes the support shafts 11, 12 to the base 22. Rotatably supported bearings,
13 is an arm for driving the lever 8, 14 is an arm for driving the cam 6, 15 is an arm for driving the cam 7, 16 is a rotating shaft, 56 is a bracket fixed to the rotating shaft 16, and 54 is the arm. A pin for pivotally supporting 13, 14, 15 to the bracket 56, 55 is an arm 13, 14,
A stop 24 attached to the base end of the arm 15 is a spring interposed between the tip end of the arm 13, 14, 15 and the bracket 56.

Next, the operation of the instantaneous switching device of the hydraulic switching valve shown in FIGS. 1 to 7 will be specifically described. FIG. 7 (a)
The state before the switching of the hydraulic switching valve is shown. In FIG. 7A, the angle between the hydraulic switching valve 1 and the lever 10 is changed for easy understanding. Lever 4,
A clockwise rotational force is applied to the support shaft 8 and the support shaft 11 by a spring 17 shown in FIG. 2, but the lever 4 is brought into contact with the semicircular section of the cam shaft 2 so that the lever 4, 8 And the support shaft 11 cannot rotate clockwise.

In this state, the rotating shaft 16 is rotated counterclockwise to bring the arm 14 into contact with the cam 6, and the cam 6 and the cam shaft 2 are rotated clockwise against the spring 18 shown in FIG. Then, as shown in FIG. 7B, the semicircular notch of the cross section of the camshaft 2 faces the tip of the lever 4, and the levers 4, 8 and the support shaft 11 are instantaneously rotated clockwise by the spring 17. And push lever 9 counterclockwise with lever 8,
The lever 9, the support shaft 12, and the lever 10 are rotated counterclockwise, and the spool of the hydraulic switching valve 1 is pushed by the lever 10 against the spring force of the built-in valve to instantaneously switch the hydraulic switching valve 1. Further, by rotating the support shaft 12 in the counterclockwise direction, the lever 5 is rotated in the same direction, the lever 5 is separated from the cam shaft 3, and the cam shaft 3 and the cam 7 are separated by the spring 19 shown in FIG. Turn counterclockwise.

When the hydraulic switching valve 1 is switched, the rotating shaft 16
Is rotated clockwise to bring the arm 13 into contact with the lever 8 as shown in FIG.
Are rotated counterclockwise against the spring 17, and the levers 9 and 10, the lever 5, the support shaft 12 and the lever 10 are rotated clockwise by a spring built in the hydraulic switching valve 1. However, when the lever 5 rotates slightly, the lever 5 is brought into contact with the semicircular section of the camshaft 3 and stopped, and the hydraulic switching valve 1 is held at the switching position.

At this time, even if the lever 10 slightly returns, the hydraulic switching valve 1 may be in an excessive state.
As shown in (e), the push plunger 51, the spring 52, and the piston 53 are provided between the hydraulic switching valve 1 and the lever 10, and when the hydraulic switching valve 1 is switched, the spool 52 of the oil passage switching valve 1 is operated by the spring 52. By pressing, even if the lever 10 slightly returns, the hydraulic switching valve 1 can be held at the switching position to prevent an excessive state.

Then, the rotation of the rotating shaft 16 in the clockwise direction is continued, and the levers 8 and 4 and the support shaft 11 are further rotated in the counterclockwise direction. After the cam 6 is rotated counterclockwise by the spring 18 of FIG. 2 and the arm 13 is separated from the lever 8, the lever 4 is brought into contact with the cam shaft 2 to hold the lever 8 at the position shown in FIG. I do. Then, the rotation of the rotating shaft 16 is continued in the clockwise direction, the arm 15 is brought into contact with the cam 7, and the cam 7 and the camshaft 3 are rotated in the clockwise direction, as shown in FIG. The notch of the semicircular cross section of the shaft 3 faces the tip of the lever 5, and the lever 5, the support shaft 12, and the levers 9, 1
0 is freely rotated, and the spool of the hydraulic switching valve 1 is returned to its original position (FIG. 7) by a spring built in the hydraulic switching valve 1.
(A) Return instantly to the position. As described above, rotating shaft 1
Even if the movement of 6 is slow, the switching and return of the hydraulic switching valve 1 is performed instantaneously without generating a neutral state.

FIG. 8 shows a case in which the hydraulic switching valve instantaneous switching device shown in FIGS. 1 to 7 is applied to a hydraulic control device for a gate. 25 is a lock gate, 26 is a rotation center pin of the lock gate 25, and 27 is a counterweight.
Are tended to be opened by the counterweight 27, which is held by the hydraulic cylinder 28. Reference numeral 29 denotes a hydraulic pipe for draining oil from the hydraulic cylinder 28, and the hydraulic pipe 29 is normally closed by a pilot check valve 30.

The hydraulic cylinder 28 and the hydraulic pipe 29
Inside, a hydraulic pressure is generated due to the weight of the counterweight 27 acting on the hydraulic cylinder 28. Reference numeral 42 denotes a pilot line connecting the hydraulic pipe 29 and the pilot check valve 30, and reference numerals 35 and 40 denote the pilot line 4.
The two-way hydraulic switching valve (the hydraulic switching valve 1 in FIGS. 1 and 2)
, A float 31 for detecting the water level on the upstream side of the gate 25, a rope 32 extending from the float 31, and a rope 45 supported by the other end of the rope 32 in a suspended state. Counterweight 33 is the same rope 32
, A pulley 34, an arm, an instantaneous hydraulic switching valve switching device 36 on the side of the three-way hydraulic switching valve 35, and an arm 3
A chain 37 suspended between the coaxial sprocket and the sprocket 33 and the sprocket mounted on the pulley 33,
A rope extending from 5, a counterweight 45 supported at the other end of the rope 37 in a suspended state, a pulley 38 for guiding the rope 37, an arm 39, and a hydraulic pressure switch 41 on the side of the three-way hydraulic switching valve 40. An instantaneous valve switching device 44 is a chain suspended between the sprocket mounted coaxially with the arm 39 and the sprocket mounted coaxially with the pulley 38.

When the water level upstream of the dam rises, float 3
1 rises. The movement of the float 31 is transmitted to the arm 34 via the rope 32, the arm 34 is rotated in the counterclockwise direction, the instantaneous hydraulic switching valve 36 is operated, and the three-way hydraulic switching valve 35 is switched in the opening direction. , The hydraulic oil in the hydraulic pipe 29 is supplied from the pilot line 42 to the three-way hydraulic switching valve 3
5, 40 → The pilot check valve 30 is sent to the pilot check valve 30, the pilot check valve 30 is opened, and the hydraulic oil on the rod side of the hydraulic cylinder 28 is supplied to the hydraulic pipe 29 → the pilot check valve 3.
0 → discharged to the tank, the counter gate 27 rotates the gate 25 in the opening direction about the rotation center pin 26, and the upstream water flows downstream.

The movement of the gate 25 in the opening direction is transmitted to the arm 39 via the rope 37, and the arm 39 is rotated clockwise. When the opening of the gate 25 reaches a certain constant value, The three-way switching valve 40 is switched to the closing direction by operating the hydraulic switching valve instantaneous switching device 41, the hydraulic piping 29 → the hydraulic pressure in the pilot line 42 is shut off, the pilot check valve 30 is closed, and the hydraulic cylinder 28 → hydraulic piping 29 → Stop discharge of hydraulic oil to the tank, and stop rotation of the gate 25 in the opening direction.

With the above control, when the water level upstream of the dam rises, the gate 25 is rotated in the opening direction. However, since the movement of the float 31 for switching the three-way hydraulic switching valve 35 is very slow, Unless the instantaneous valve switching device 36 is provided in the three-way hydraulic switching valve 35, the following inconvenience occurs. That is, since the movement of the upstream water level is usually about several cm per day, if the three-way hydraulic switching valve 35 is directly switched by the float 31, the time from the start to the completion of the switching becomes longer. Is held neutral and 3
All of the ports are connected, and as a result,
The pilot line 42 is connected to the drain, and the hydraulic oil on the rod side of the hydraulic cylinder 28 flows to the drain, and the water gate 25
Is kept open until the switching is completed, which causes a disadvantage that control becomes impossible. In order to solve the problem described above, it is necessary to provide the instantaneous hydraulic switching valve switching device 36 in the three-way hydraulic switching valve 35.

Reference numeral 46 denotes a hydraulic pressure source for closing the gate by the hydraulic cylinder 28 against the force of the counterweight 27.

[0022]

As described above, the instantaneous switching device of the hydraulic switching valve according to the present invention includes the arms 13, 14, and 15 of the rotary shaft 16, the two sets of semicircular camshafts 2 and 3 having the characteristics of operating instantaneously. , Support shafts 11 and 12, and levers 4, 5, 6, 8, 9, 1
0 and the springs 17, 18, and 19, constitute an instantaneous switching device, which is interposed between the rotary shaft 16 and the hydraulic switching valve 1, and in which the movement of the rotary shaft 16 is slow. However, there is an effect that the switching and return of the hydraulic switching valve 1 can be performed instantaneously without generating a neutral state.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional plan view showing an embodiment of a hydraulic switching valve instantaneous switching device according to the present invention.

FIG. 2 is a partially longitudinal side view thereof.

FIG. 3 is a longitudinal sectional side view along the line AA and the line CC of FIG. 1;

FIG. 4 is a vertical side view taken along the line BB in FIG. 1;

FIG. 5 is a cross-sectional plan view of a cam shaft portion taken along line XX of FIG. 2;

FIG. 6 is a cross-sectional plan view of the support shaft portion along the line YY in FIG. 2;

FIG. 7 is an explanatory view of the operation of the instant hydraulic switching valve instantaneous switching device.

FIG. 8 is a system diagram showing a hydraulic control device for a floodgate to which the instant hydraulic switching valve instantaneous switching device is applied.

FIG. 9 is a diagram illustrating the operation of the hydraulic switching valve.

FIG. 10 is a side view showing a conventional switching device for a hydraulic switching valve. DESCRIPTION OF SYMBOLS 1 Hydraulic switching valve 2 Camshaft 4,5,6,8,9,10 Lever 11,12 Support shaft 13,14,15 Arm 16 Rotation shaft 17,18,19 Spring 22 Base

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16K 31/44-31/62

Claims (1)

(57) [Claims] 1. A rotary shaft 16, cam shafts 2, 3 and rotatable support shafts 11, 12 are arranged in parallel, arms 13, 14, 15 are fixed to the rotary shaft 16, and the cam shaft 2 The lever 6 that contacts the arm 14 is fixed to the arm 14, the cam 7 that contacts the arm 15 is fixed to the camshaft 3, and the lever 4 and the arm 1 that contact the camshaft 2 are fixed to the support shaft 11.
3, the lever 5 that contacts the camshaft 3, the lever 9 that contacts the lever 8, and the lever 10 that contacts the hydraulic switching valve 1 are fixed to the support shaft 12. A spring 17 for urging the support shaft 11 clockwise is provided between the base 22 and springs 18 and 19 for urging the cam shafts 2 and 3 counterclockwise are provided between the base 22 and the base 22. An instantaneous switching device for a hydraulic switching valve.