JPH1037233A - Operation device for pilot control valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To operate a control valve for the blade of a hydraulic shovel with a pilot control valve capable of holding a definite operating position. SOLUTION: A remote control valve mounting flange 91 is integrally mounted on a valve main body 81 of a remote control valve 63 which pilot-operates a blade control valve for a hydraulic shovel. A disk 94 is pivoted on a support shaft 95 in the mounting flange 91 and an operation rod 84 of the remote control valve 63 is operated with the disk 94 which is turned with an operation lever 114. A detent mechanism 108, which is locked at a definite position, is mounted on the disk 94. The detent mechanism 108 provides a detent groove 98 on a circular surface 100 which is concentric to the support shaft 95 in the disk 94 where a steel ball is removably provided in the detent groove 98. The steel ball 104 presses elastically with a compression coil spring capable of adjusting a spring force with a nut 106.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pilot control valve operating device.

[0002]

2. Description of the Related Art As shown in FIG. 3, for example, in a hydraulic shovel, an upper revolving structure 12 is rotatably provided on a lower traveling structure 11, and a cab 13 for protecting an operator is provided on one side of the upper revolving structure 12. The front work machine 14 is provided substantially at the center of the upper swing body 12.

[0003] A base end of a blade arm 15 is attached to the main body frame of the lower traveling body 11 by a horizontal axis (not shown), and a blade 16 is attached to a tip end of the blade arm 15. It is moved up and down by a blade cylinder 16a axially connected therebetween.

In the front working machine 14, a first boom 21 is mounted on the upper revolving unit 12 by a horizontal axis 20, and one end of a second boom 23 is mounted on the first boom 21 by a vertical axis 22.
A third boom 25 is attached to the other end of the second boom 23 by a vertical axis 24, a stick 27 is attached to the third boom 25 by a horizontal axis 26, and a bucket 29 is attached to a tip of the stick 27 by a horizontal axis 28. Installed. Below, the first boom
A series of members from 21 to the third boom 25 is called an offset boom.

The first boom 21 is vertically rotated by a boom cylinder 21a, the second boom 23 is horizontally rotated by an offset cylinder 23a, and the stick 27 is a third
The bucket 29 is rotated vertically by a stick cylinder 27a attached to the boom 25,
It is turned up and down by a.

As shown in FIG. 4, a pair of the blade cylinders 16a is provided.
16a is a blade control valve (hereinafter referred to as blade valve 30).
) At the same time.

The blade valve 30 includes a neutral position N for fixing the height position of the blade 16, a blade raising position U for raising the blade 16, and a blade 16 based on the spool shift position of the valve mechanism 31. It has a blade lowering position D for lowering and a float position F for blade lifting work.

The float position F of the blade valve 30 is
Check oil 34 discharged from a main pump 33 driven by the engine 32 and regulated by a relief valve 40
, A hydraulic oil supply line 35 for supplying hydraulic oil to the blade cylinder 16a, a hydraulic oil output line 36, 37 for supplying hydraulic oil to the blade cylinder 16a, and a hydraulic oil discharge line 39 communicating with a tank 38. And internal passages f1, f2, f3 for communicating all of them.

The float position F is a switching position for bringing the blade cylinder 16a into a free state, and is used, for example, when performing a blade floating operation for leveling soft ground or the like by the weight of the blade 16.

As shown in FIG. 5, a valve mechanism section 31 of the blade valve 30 has a main spool 42 slidably fitted to a valve body 41 having an internal passage formed therein.
A detent mechanism 43 is provided on one side of the valve mechanism 31.

The detent mechanism 43 includes a detent spool 44 integrated with the main spool 42 by screwing.
And a compression coil spring 45 and one pressing ball 46 fitted inside the detent spool 44, and a plurality of steel balls 47 engaged with the pressing ball 46 and pressed outward by the repulsive force of the spring 45. And a detent sleeve 49 in which a detent groove 48 into which the steel balls 47 are fitted is formed.

Main spool protruding from valve body 41
A wire connection part 51 is provided at one end of the wire connection part 51, and a wire 52 for operating the main spool 42 is provided on the wire connection part 51.
Are connected at one end. The other end of this wire 52
It is connected to a blade lever 53 shown in FIG.

By pushing and pulling the blade lever 53, the main spool 42 is shifted via the wire 52 to one side or the other side in the axial direction by a predetermined amount.
As shown in FIG. 5, the main spool 42 is provided with a return spring 56 by a pair of spring receiving portions 54 and 55, and the return spring 56 causes the main spool 42 to return.

In such an operation of the blade lever 53, when changing from the blade lowering position D to the float position F for the blade lifting operation, the blade lever
By further pulling 53 from the state of FIG. 5 corresponding to the blade lowering position D to the right, the steel ball 47 is fitted into the detent groove 48, and the floating position F is set.

[0015]

In this conventional apparatus, since the main spool 42 is directly pulled by the wire 52, a large operation force is required particularly at the float position F for floating the blade. Adjustment is also difficult. Further, the main spool 42 is connected via a wire 52.
Therefore, there is a problem that the arrangement of the blade valve 30 and the blade lever 53 is restricted, and that the wire 52 may be loosened or cut, which may cause an operation failure, and that the adjustment of the wire is troublesome.

On the other hand, control valves for controlling the actuators of the traveling system, the turning system, and the front working machine system of the hydraulic shovel are operated by operating devices such as operating levers via pilot control valves. When the hand or foot is released, the pilot control valve returns to the neutral position, the control valve also returns to the neutral position, and the actuator stops.
Cannot handle blade floating work.

The present invention has been made in view of the above points, and provides an operating device for a pilot control valve that can maintain a control valve for controlling an actuator at a constant operating position even when an operator releases his / her limbs. The purpose is to do so. It is another object of the present invention to reduce the operating force and improve the degree of freedom in the arrangement of the valve and the operating device for a direct pulling operation using a wire.

[0018]

According to the first aspect of the present invention, there is provided an operating device of a pilot control valve for pilot-operating a control valve for controlling an actuator via a pilot control valve by an operator manually operated. ,
This is a pilot control valve operating device provided with a detent mechanism for locking the operating device at a fixed operating position.

When the pilot control valve is used for a control valve for a blade of a hydraulic shovel, for example, the operating device is locked by a detent mechanism at a certain operation position such as a blade floating operation.

According to a second aspect of the present invention, there is provided a pilot control valve operating device according to the first aspect, wherein the operating device comprises a shaft support provided integrally with a valve body of the pilot control valve; And an operating body rotatably supported by a support shaft to operate an operating portion of the pilot control valve, and an operating lever provided integrally with the operating body and rotating the operating body.

The operating body rotatably supported by the support shaft on a shaft support integral with the valve body of the pilot control valve is moved by an operation lever to a predetermined operation position locked by a detent mechanism. By operating the lever, the operating part of the pilot control valve is operated according to the principle of leverage.

According to a third aspect of the present invention, in the operating device for a pilot control valve according to the second aspect, the detent mechanism includes a detent groove provided on an arc-shaped surface concentric with the spindle in the operating body, It comprises a locking body movably provided on the body side and capable of engaging and disengaging from the detent groove, and a spring for elastically pressing the locking body against the arcuate surface of the operating body.

Then, the arc-shaped surface of the operating body is rotated with respect to the locking body, and the locking body pressed by the spring is engaged with the detent groove of the operating body to rotate the operating body. Lock.

According to a fourth aspect of the present invention, the spring in the operating device for the pilot control valve according to the third aspect is fitted together with a locking body inside a threaded cylinder screwed to the shaft support. , A compression coil spring incorporated in a compressed state between the locking body and a nut screwed into the threaded cylinder.

Then, the spring force of the compression coil spring is adjusted by a nut screwed into the threaded cylinder,
By adjusting the force acting on the operating body from the compression coil spring via the locking body, the operating force for rotating the operating body is adjusted.

According to a fifth aspect of the present invention, in the operating device for a pilot control valve according to any one of the first to fourth aspects, the pilot control valve vertically moves a blade attached to a lower traveling body of the hydraulic shovel. It is connected to a blade control valve for controlling a moving blade cylinder by a pilot line. The detent groove of the detent mechanism is provided at a position corresponding to an operating device that operates the blade control valve to a float position for blade lifting work via a pilot control valve.

When the blade lifting operation is performed by the weight of the blade attached to the lower traveling body of the hydraulic excavator, the operating device is rotated to a position where the detent mechanism works, and the pilot control valve is connected to the pilot line via the pilot line. The blade control valve is operated to the float position by the supplied pilot pressure.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Parts similar to those in the conventional example shown in FIGS. 4 and 5 are denoted by the same reference numerals, and description thereof may be omitted.

As shown in FIG. 3, an upper revolving structure 12 is provided on the lower traveling structure 11 so as to be revolvable, and a cab 13 for protecting an operator is provided on one side of the upper revolving structure 12. A front work machine 14 is provided at almost the center of the
A base end of a blade arm 15 is attached to a main body frame of the lower traveling body 11 by a horizontal axis (not shown), and a blade 16 is attached to a tip end of the blade arm 15, and the blade 16 is disposed between the main body frame and the main body frame. It is moved up and down by a blade cylinder 16a as an actuator connected to the shaft.

As shown in FIG. 2, a pair of blade cylinders 16a for vertically moving the blade 16 is provided with a pilot-operated blade control valve (hereinafter referred to as a blade valve 60).

This pilot operated blade valve 60 is
With respect to the main spool constituting the valve mechanism 31, a pilot pressure operating portion 61 on one side and a pilot pressure operating portion 62 on the other side are provided.
Are provided.

The valve mechanism 31 of the blade valve 60 includes a neutral position N for fixing the height position of the blade 16 and a blade raising position U for raising the blade 16 according to the shift position of the main spool. A blade lowering position D for lowering the blade 16,
A floating position F for floating the blade is provided in which the blade cylinder 16a is in a free state and the soft ground or the like is leveled by its own weight.

The float position F of the blade valve 60 is
Checks the operating oil discharged from the main pump 33 driven by the engine 32 and regulated by the relief valve 40
A hydraulic oil supply line 35 for supplying hydraulic fluid to the valve mechanism unit 31 via a valve 34, hydraulic oil output lines 36 and 37 for supplying hydraulic oil to the blade cylinder 16a, and a hydraulic oil discharge line communicating with a tank 38 39 are provided with internal passages f1, f2, f3 for all communication.

On the other hand, the pilot pressure operating portion of the blade valve 60
A remote control valve 63 as a pilot control valve that is operated by an operator such as a hydraulic shovel by a lever is connected to 61 and 62.

The remote control valve 63 has a passage 67 for receiving pilot pressure oil from a pilot pump 64 driven by the engine 32 together with the main pump 33 via a supply line 65 and a filter 66.

The passage 67 communicates with each pilot pressure oil supply port 71 of a pair of pressure reducing valves 68 and 69, which are main components of the remote control valve 63.

The pair of pressure reducing valves 68 and 69 are respectively provided with coil springs 72 and
Spools 74 that receive elastic pressing force from 73 are provided so as to be displaceable.

These spools 74 connect the pilot pressure oil supply ports 71 or the drain ports 75 respectively connected to the tanks 38 to the pilot pressure oil output ports 76 in accordance with the degree of displacement.

Each of these pilot pressure oil output ports 76
Are connected to a pilot pressure acting portion 61 on one side of the blade valve 60 and a pilot pressure acting portion 62 on the other side by pilot lines 77 and 78 such as hydraulic hoses.

As shown in FIG. 1, the remote control valve 63
A rod holding portion 82 is fitted to the upper portion of the valve body 81 via an O-ring 83, and an operating rod 84 as a pair of operating portions for operating the pair of pressure reducing valves 68 and 69 is mounted on the rod holding portion 82.
A spring receiver 86, which is vertically movably mounted via an O-ring 85 and is moved up and down together with the operating rod 84, is fitted to a lower portion of each of the operating rods 84. , 69 coil springs 72,
The upper ends of 73 are locked.

An inner space 87 is provided in the lower portion of each operating rod 84, and the inner space 87 is provided with a spool of each of the pressure reducing valves 68 and 69.
A head 88a of a shaft member 88 formed integrally with 74 is slidably fitted. The heads 88a of these shaft members 88 are locked during the upward return movement of the operating rods 84 by the locking portions 89 provided below the operating rods 84, and are returned upward.

Above the remote control valve 63, the remote control valve 63
An operation device 90 for manual operation of is provided as follows.

A remote control valve mounting flange 91 as a shaft support is integrally mounted on the upper side of the valve main body 81 of the remote control valve 63 by bolts or the like, and operates in the inner space 93 of the cylindrical portion 92 of the remote control valve mounting flange 91. A disk 94 as a body is fitted and pivotally supported by a support shaft 95. The upper ends of the pair of operating rods 84 are respectively abutted and locked to a flat portion 96 formed below the disk 94.

An arcuate surface 100 concentric with the support shaft 95 is formed in the left and right side surfaces of the disk 94, and a ball moving groove 97 is formed in the vertical direction of the arcuate surface 100. The right ball movement groove 97 is provided with a V-shaped detent groove 98 at a relatively upper position corresponding to the float position F, and the left ball movement groove 97 is provided with a detent groove 98 And a ball locking portion 99 is provided at a point-symmetric position with respect to the center of the support shaft 95.

On the left and right portions of the remote control valve mounting flange 91 facing the left and right arc-shaped surfaces 100 of the disk 94, a pair of threaded cylinders 101 is formed by a rotary operation flange 102 integrally formed at the center thereof. Each of the ball holding bodies 103 is slidably fitted inside the threaded cylindrical body 101, and is engaged with the disk side of these ball holding bodies 103. Approximately half of the steel balls 104 as bodies are fitted and held, and the tip portions of these steel balls 104 are fitted into the ball moving grooves 97 of the disk 94, respectively.

On the opposite side of each of the ball holders 103, compression coil springs 105 for pressing the steel balls 104 into the ball moving grooves 97 are respectively abutted, and these compression coil springs 105 are attached to the threaded cylindrical body 101. Each is locked by a spring receiving nut (cap nut) 106 screwed to the outer peripheral thread portion. These spring receiving nuts
The position of the screw 106 can be adjusted by screwing, and the adjusted position is fixed by engagement with locking nuts 107 screwed to the threaded portions of the threaded cylinder 101, respectively.

The detent groove 98, steel ball 104
Means for urging the steel ball 104 against the arcuate surface 100 of the disk 94 by the spring 105 is a manipulator 90
The detent mechanism 108 is configured to lock at a certain operation position.

A lever mounting flange 111 is fixed to a flat portion formed on the upper side of the disk 94 by bolts 112, and a cylindrical portion 113 of the lever mounting flange 111 has a lower portion of a blade operating lever 114 included in the operating device 90. Are screwed together. Cylindrical part 113 of lever mounting flange 111
The bellows-like cover 115 seals the space between the remote control valve mounting flange 91 and the upper part.

Next, the operation of the embodiment shown in FIGS. 1 and 2 will be described.

The state shown in FIG. 1 corresponds to the neutral position N of the blade valve 60 shown in FIG. 2, and the blade operating lever 114 is moved to the left from the state shown in FIG. Is rotated counterclockwise, the disc 94 pushes down the left operating rod 84, a spring force acts on the spool 74 of the left pressure reducing valve 69 via the coil spring 73, and the spool 74 shifts to reduce the pressure. Valve 69
The pilot pressure oil supply port 71 and the pilot pressure oil output port 76 communicate with each other.
The pilot pressure oil supplied to the pressure reducing valve 69 via 65 acts on the pilot pressure operating section 62 on the right side of the blade valve 60 via the pilot line 78, and switches the valve mechanism section 31 to the blade raising position U. The hydraulic oil discharged from the main pump 33 and having passed through the blade raising position U operates the blade cylinder 16a in a contracting direction to raise the blade 16.

As described above, when the disk 94 rotates, the left and right steel balls 104 relatively slide or roll in the ball moving grooves 97 provided on the left and right arc-shaped surfaces 100 of the disk 94. .

The blade operating lever shown in FIG.
When the disc 94 is turned clockwise by moving the disc 114 rightward, the disc 94 pushes down the right operating rod 84, and the right pressure reducing valve 68 is moved through the coil spring 72.
A spring force acts on the spool 74 of the valve, the spool 74 shifts, and the pilot pressure oil supply port 71 and the pilot pressure oil output port 76 of the pressure reducing valve 68 communicate with each other.
The pilot pressure oil supplied from 64 to the pressure reducing valve 68 via the supply line 65 acts on the pilot pressure operating section 61 on the left side of the blade valve 60 via the pilot line 77, and switches the valve mechanism section 31 to the blade lowering position D first. . The hydraulic oil discharged from the main pump 33 and passing through the blade lowering position D operates the blade cylinder 16a in the extending direction to lower the blade 16.

The blade operation lever 114 is more than the above case.
To the right to move the ball lock 99
Is rotated to a position where it engages with the left steel ball 104, the right steel ball 104 is fitted into the detent groove 98 of the disk 94 by the repulsive force of the compression coil spring 105, and the rotation of the disk 94 is locked. .

When the disk 94 rotates to this position, the right operating rod 84 is pushed down the most by the disk 94, and the maximum spring force acts on the spool 74 of the right pressure reducing valve 68 via the coil spring 72, and 74 shifts most and the pilot pressure oil supply port 71 of the pressure reducing valve 68 and the pilot pressure oil output port 76 communicate with each other to the maximum, and the highest pilot pressure oil passes through the pilot line 77 and acts on the pilot pressure on the left side of the blade valve 60. Acting on the part 61, the valve mechanism part 31 of the blade valve 60 switches from the blade lowered position D to the float position F for blade lifting work.

At the float position F, the hydraulic oil supply line 35 and the hydraulic oil output lines 36 and 37 are both connected to the tank 38 by the hydraulic oil discharge line 39, so that the hydraulic pressure does not act on the blade cylinder 16a. The blade 16 performs leveling work only by its own weight.

As described above, the valve mechanism of the blade valve 60
When the blade 31 is switched from the blade lowering position D to the float position F for floating the blade, the steel ball 104 in the ball moving groove 97 on the right side is moved to the detent groove 98.
The compression coil spring 105 is inserted into the steel ball
The force that presses the disc 104 into the detent groove 98 and locks the rotation of the disk 94 is greater than the force by which the right operating rod 84 that attempts to ascend and return causes the disk 94 to return and rotate counterclockwise. Therefore, the disk 94 and the blade operating lever 114 are automatically fixed at the rotation position corresponding to the float position F.

On the other hand, when the blade operating lever 114 is forcibly rotated in the counterclockwise direction, the disk 94 which rotates in the same direction causes the steel ball 104 in the detent groove 98 to detent against the compression coil spring 105. The groove 98 is retracted into the ball moving groove 97.

As described above, even when the blade valve 60 is switched to the float position F, the blade operation lever 11
4, the disk 94 provided integrally with the base portion need only be rotated extra, so that switching can be performed with the same light operating force as in other positions.

That is, the disk 94 rotatably supported by the support shaft 95 on the remote control valve mounting flange 91 integral with the valve body 81 of the remote control valve 63 has the upper end of the operating lever 114 as a point of force and the support shaft 95 Fulcrum and the contact point of the remote control valve 63 with the operating rod 84 as the load point.
The operating rod 84 of 63 can be pushed in with a slight lever operating force, and the operating lever 114 can be turned with a small operating force to the floating position corresponding to the float position where the detent groove 98 of the disk 94 is locked by the steel ball 104. It can be operated dynamically.

The spring force of the compression coil spring 105 is adjusted by a spring receiving nut 106 and a locking nut 107 screwed to the threaded cylinder 101, and the compression coil spring 105 is moved from the compression coil spring 105 via a steel ball 104 to a disk 94. By adjusting the force acting on the operating device 90, the operating force for rotating the operating device 90 can be adjusted.

For example, when the compression coil spring 105 is adjusted in the extending direction, the load acting on the ball moving groove 97 of the disk 94 from the steel ball 104 is reduced, and the operating force for rotating the blade operating lever 114 is reduced by the steel. As far as the ball 104 can lock the detent groove 98, the weight can be reduced as much as possible.

Furthermore, since the remote control valve 63 operated by the blade operating lever 114 and the blade valve 60 can be freely connected by the pilot lines 77 and 78 such as hydraulic hoses, adjustment like a conventional wire can be performed. It is unnecessary, and the blade valve 60 and the remote control valve 63
Can be arranged freely.

Finally, a remote control valve similar to a remote control valve for controlling the traveling system, the turning system or the front working machine system.
Since the blade cylinder 16a can also be controlled by the 63, there is no need to additionally install a wire for the hydraulic control lock (safety lock) to prevent malfunction when the lever is in neutral. , Can be shared with other remote control valves.

The invention described in claims 1 to 4 is not limited to a pilot control valve for a blade used for a control valve for a blade of a hydraulic shovel, but may be a pilot control valve for other uses. It can also be applied to

[0065]

According to the first aspect of the present invention, the operating device of the pilot control valve is locked at a fixed operating position by the detent mechanism. The control valve for controlling the actuator, which is pilot operated by the pilot control valve, can be maintained at a fixed operation position. For example, the pilot control valve is used for the blade control valve of a hydraulic shovel to perform a certain operation such as blade lifting work. It is also possible to work at the position.

According to the second aspect of the present invention, the operating body for the operating portion of the pilot control valve is rotatably supported by the shaft on the shaft supporting body integral with the valve body of the pilot control valve. Since the body is rotated by the operation lever, even when the operation amount to a certain operation position locked by the detent mechanism is large, the operation lever can be lightly rotated by the leverage principle, and operability can be improved. .

According to the third aspect of the present invention, the locking member movably provided on the shaft support can be freely disengaged from the detent groove provided on the arc-shaped surface concentric with the support shaft of the operating body. Since the locking body is elastically pressed against the arc-shaped surface of the operating body by the spring, the arc-shaped surface of the operating body can be smoothly rotated with respect to the locking body, and the operating body is locked to the detent groove. The body can be reliably engaged by the spring.

According to the fourth aspect of the invention, the spring force of the compression coil spring is adjusted by the nut screwed to the threaded cylinder, and the compression coil spring acts on the operating body via the locking member. By adjusting the force, the operating force for rotating the operating body can be easily adjusted.

According to the fifth aspect of the present invention, there is provided a float of an operating device which operates a blade control valve for controlling a blade cylinder for moving a blade mounted on a lower traveling body of a hydraulic shovel up and down through a pilot control valve. Since the detent groove of the detent mechanism is provided at the position corresponding to the position, the blade control valve can be moved to the float position when the blade control valve is moved to the float position, compared to the conventional case where the blade control valve is operated directly by wire. It can be easily operated with a light operating force using the pilot pressure as in the case of operation. In addition, since the blade control valve and pilot control valve are connected by a pilot line, there is no need for troublesome operation or time-consuming adjustments, such as the conventional direct pulling operation with a wire, and maintenance can be improved. There is also an advantage that the location of the pilot control valve and the operating device can be freely set. Furthermore, the structure of the detent mechanism is simple, and the number of components can be reduced as compared with a direct drawing mechanism using a wire.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a pilot control valve operating device according to the present invention.

FIG. 2 is a hydraulic circuit diagram for vertically moving a blade using the pilot control valve.

FIG. 3 is a schematic view of a hydraulic excavator having a blade.

FIG. 4 is a conventional hydraulic circuit diagram for vertically moving a blade.

FIG. 5 is a sectional view of a conventional blade control valve.

[Explanation of symbols]

 11 Undercarriage 16 Blade 16a Blade cylinder as actuator 60 Control valve for blade (blade valve) 63 Remote control valve as pilot control valve 77, 78 Pilot line 81 Valve body 84 Operating rod as operating part 90 Operating device 91 Axle support Remote control valve mounting flange as body 94 Disc as working body 95 Spindle 98 Detent groove 100 Arc-shaped surface 101 Threaded cylinder 104 Steel ball as locking body 105 Compression coil spring 106 Nut 108 Detent mechanism 114 Operating lever F Float position

Claims (5)

[Claims] A detent mechanism for locking an operation device at a fixed operation position in a pilot control valve operation device for pilot-operating a control valve for controlling an actuator by a human-operated operation device via a pilot control valve. An operating device for a pilot control valve, comprising: 2. An operating device, comprising: a shaft support provided integrally with a valve body of a pilot control valve; and an operating unit of the pilot control valve that is rotatably supported by the shaft support by a support shaft. The operating device for a pilot control valve according to claim 1, further comprising an operating body, and an operating lever provided integrally with the operating body and configured to rotate the operating body. 3. A detent mechanism comprising: a detent groove provided on an arc-shaped surface concentric with a support shaft of an operating body; a locking member movably provided on the shaft support side and capable of engaging and disengaging from the detent groove; 3. The operating device for a pilot control valve according to claim 2, further comprising a spring that elastically presses the locking body against the arcuate surface of the operating body. 4. The spring is fitted together with a locking member inside a threaded cylinder screwed to the shaft support, and is compressed between the locking member and a nut screwed to the threaded cylinder. The operating device for a pilot control valve according to claim 3, wherein the operating device is a compression coil spring incorporated in a state. 5. The pilot control valve is connected by a pilot line to a blade cylinder control valve for controlling a blade cylinder mounted on a lower traveling body of a hydraulic shovel for moving a blade up and down, and a detent groove of a detent mechanism is provided for a blade. The operating device for a pilot control valve according to any one of claims 1 to 4, wherein the control valve is provided at a corresponding position of an operating device that operates the floating position for blade lifting work via the pilot control valve. .