JP2004183837A - Valve operating device and pilot valve comprising the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem in manufacturing pilot valves of various specifications and pressure characteristics corresponding to construction machines and operating machines, that the number of kinds of pilot valves is increased, which needs the cost for managing and manufacturing the same, and needs the complicated selecting/mounting work. <P>SOLUTION: An operation pedal adjusting a channel opening of a valve body by being tilted, and a tilt angle restricting part 11 for restricting a tilt angle of the operation pedal 7 and a tilting restricting part 16 are mounted. The tilt angle determining part 11 and the tilting restricting part 16 are switchable between a restraining state for restraining the tilting of the operation pedal 7, and a tilting state for restricting the tilting of the operation pedal 7 within a predetermined angular range, so that the pilot valve can cope with various specification and pressure characteristics. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a valve operating device and a pilot valve for controlling a working machine optionally mounted on a construction machine or an industrial machine, and more particularly, to a valve operating machine capable of adjusting specifications according to a working machine, and a pilot valve including the same. It is about.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, construction machines, industrial machines, and the like (hereinafter, these are collectively referred to as “construction machines, etc.”) have been manufactured according to work purposes. On the other hand, such a construction machine or the like may be provided with various attachments (hereinafter, referred to as “working machines”) according to the work as options so that various works can be performed in addition to the normal work form. For example, in the case of a hydraulic excavator that is a construction machine, in addition to the usual work of transporting and discharging loose objects and the like with a shovel, when performing work such as crushing asphalt, a breaker is attached instead of the shovel, and When performing an operation such as gripping, a nibble is attached instead of a shovel.
[0003]
After the hydraulic excavator is completed, such a working machine is often installed by remodeling by the manufacturer of optional equipment, etc., and at the time of the remodeling, the pilot valve for operation is installed in the driver's seat together with the optional equipment. Has been added.
[0004]
The pilot valve controls a main control valve that operates various optional devices, and controls opening and closing of the main control valve with control oil from the pilot valve to cause a work machine to perform a predetermined operation.
[0005]
As a prior art relating to this type of pilot valve, as shown in a side view showing a hydraulic pilot valve in FIG. 7, an operation stroke end position of an operation lever 51 for operating the hydraulic pilot valve is adjusted by a bolt 53 capable of adjusting the height by a shim 52. By adjusting the height position to make it adjustable, the operation stroke end position at which the projecting piece 54 that tilts with the operation lever 51 abuts the bolt 53 is adjusted so that the maximum pressure of the hydraulic oil output from the pilot valve is different. There is one that can be made to be able to be performed (for example, see Patent Document 1).
[0006]
[Patent Document 1]
Japanese Utility Model Registration No. 25882656
[Problems to be solved by the invention]
However, since the operating pressure of the working machines described above differs depending on the type and specifications, and since the construction machines and the like of each company to which these working machines are mounted also have various specifications, a pilot valve for operating these working machines is used. Often have different pressure characteristics. For this reason, optional equipment manufacturers and the like must produce a pilot valve that has different pressure characteristics for construction machines and the like of each company and that can be operated appropriately for the working machine to be installed, in accordance with such a difference in specifications. .
[0008]
In addition, since the driver's seat where such a pilot valve is provided also differs depending on the construction machine of each company, the space where a new pilot valve can be mounted is limited, and the mounting position of the pilot valve is located on either the left or right position. There are various things. For this reason, optional equipment manufacturers and the like cope with left and right mounting by separately manufacturing the left mounting and the right mounting.
[0009]
However, when manufacturing pilot valves having different pressure characteristics or manufacturing left and right pilot valves separately, the types of pilot valves must be increased, and different pilot valves must be used according to the machine and the working machine. In addition, the management and production of the pilot valve require cost, and complicated selection and installation work must be performed.
[0010]
On the other hand, the working machine as described above is not always used, nor is the same working machine always attached, and is removed or replaced according to the work. For this reason, the pilot valve for operating various working machines that perform various operations in this way should not be operated when the working machine is removed, etc. Accordingly, a specification change must be made to adjust to a state in which bidirectional operation or one operation is possible. For example, when the above-described breaker is attached, the state is adjusted so that only one operation is possible, and when the above-mentioned nibble is attached, the state is adjusted so that both directions can be operated.
[0011]
In the above-described Patent Document 1, although the stroke end position of the operation lever 51 can be adjusted, it is not possible to quickly respond to changes in various operation states and operation ranges of the operation lever 51.
[0012]
[Means for Solving the Problems]
Therefore, in order to solve the above problems, a valve operating device of the present invention includes an operating unit that adjusts a flow path opening degree of a valve body by tilting, and a tilt angle regulating unit that regulates a tilt angle of the operating unit. The tilt angle restricting means is configured to be switchable between a restraining state in which the tilting of the operating means is restrained and a tilting state in which the operating means restricts tilting within a predetermined angle range. This makes it easy to arbitrarily adjust the tilt angle range of the operating means for adjusting the opening degree of the flow passage of the valve body, and the fixing and tilting directions of the operating means. Therefore, since the tilt angle range of the operating means can be adjusted according to the specifications and pressure characteristics that differ depending on the construction machine or the like, the same valve operating device can cope with various specifications and pressure characteristics.
[0013]
The tilt angle restricting means comprises a tilt restricting portion fixed to the valve body side, and a tilt angle determining portion that tilts together with the operating means, and the tilt angle determining portion abuts on the tilt restricting portion to tilt. If an adjusting member for adjusting the angle range is provided, the adjusting member can arbitrarily adjust the tilt angle range between the tilt restricting portions that restrict the tilt of the operating means.
[0014]
Further, the operating means comprises a support member for adjusting a flow path opening of the valve body, and an operation member for tilting integrally with the support member, and the support member is provided with the tilt angle determining portion. For example, the support member for operating the valve body is provided separately from the operating member, so that the mounting of the valve operating device can be facilitated.
[0015]
Further, if the tilt restricting portion is constituted by a plunger which can select at least a state in which the operation means is suppressed and a state in which the operation means can be tilted in one or both directions by restricting the operation means at a predetermined angle, The switching between the restrained state in which the tilting of the member is fixed and the tilting state in which the operating member can be tilted at a predetermined angle can be easily changed with a plunger, so that the tilting state of the operating member according to the attachment / detachment state of the working machine can be changed. It is possible to quickly switch to the inhibition state.
[0016]
In addition, if the adjusting member is configured by an adjusting bolt that can move forward and backward in a direction of adjusting the tilt angle range by contacting the tilt regulating portion, the tilt angle range of the operating member can be easily adjusted by a general tool such as a wrench. Therefore, the tilt angle range of the operation member can be easily adjusted even at the work site.
[0017]
On the other hand, a pilot valve according to the present invention is provided with any one of the above-described valve operating devices above the valve body. Thus, it is possible to configure a pilot valve that can easily adjust the control oil amount, the fixing of the operation means, the tilt direction, the tilt angle, and the like. Therefore, since the tilt angle of the operating means can be adjusted according to the specifications and pressure characteristics that differ depending on the construction machine or the like and the working machine, it is possible to cope with various specifications and pressure characteristics with the same pilot valve.
[0018]
Further, the tilting center of the operating means and the tilting angle regulating means are provided on a vertical axis substantially at the center in the front-rear direction of the valve body, and the operating means and the tilting angle regulating means are inverted right and left of the valve body. By configuring so that it can be mounted, if the operating means and the tilt angle restricting means are mounted in opposite directions, it is possible to make the form according to the position of the operating pedal in the driver's seat, so that the same pilot valve It can respond to the mounting condition. As a result, it is possible to reduce the number of types of pilot valves, reduce costs required for management and manufacture of the pilot valves, and facilitate selection and installation of the pilot valves.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view of a pilot valve showing an embodiment of the present invention, FIG. 2 is a front view of the pilot valve, FIG. 3 is a plan view of the pilot valve, and FIG. It is. 1 to 3 show a pilot valve, and FIG. 4 shows only a valve operating device. In the following embodiments, an operation pedal will be described as an example of an operation member, and an example in which the operation pedal is tilted in the front-rear direction with the left in the state shown in FIG.
[0020]
As shown in FIGS. 1 and 2, a mounting flange 2 is provided on an upper portion of the valve main body 1, and the valve main body 1 is mounted on a floor 3 of a driver's seat by the mounting flange 2. An operating member 4 that opens and closes an oil passage provided inside the valve body 1 is provided so as to protrude above the valve body 1. The operating member 4 is provided so as to be tiltable around a tilt center O which is an axis orthogonal to the paper surface of FIG. As shown by a two-dot chain line in FIG. The tilt center O is provided substantially at the center of the valve body 1 in the front-rear direction. The operating member 4 is protected from surrounding dust and the like by a bellows-shaped dustproof cover 5.
[0021]
On the upper part of the operating member 4, a support member 6 constituting an operating means is fixed. The support member 6 is fixed to a bolt hole 4 a provided at an upper portion of the operation member 4 with a bolt 8. The fixed support member 6 can be tilted in the front-rear direction around the tilt center O integrally with the operating member 4.
[0022]
An operation pedal 7 is attached to an upper portion of the support member 6. The operation pedal 7 has a substantially V-shaped upper surface, and has a mounting bracket 9 protruding from the lower surface of the recessed central portion. The mounting bracket 9 is fixed to the support member 6 with bolts 10, thereby forming an operation means in which the operation pedal 7 and the support member 6 are integrated. Since the support member 6 of the operation pedal 7 is integrally fixed to the operation member 4 as described above, if the operation pedal 7 is tilted, the operation member 4 is tilted integrally.
[0023]
As shown in FIGS. 2 and 3, on one side of the support member 6, a tilt angle determining portion 11 for regulating the tilt angle of the support member 6 is provided. The angle determining portion 11 is provided with a protrusion 12 projecting from one side of the support member 6 from the front and back, and an adjustment bolt 14 screwed into a screw portion 13 of the protrusion 12.
[0024]
As shown in FIG. 4, the adjusting bolts 14 are screwed into the screw portions 13 of the respective projecting portions 12 projecting from the front and rear of the support member 6 from the front and rear toward between the projecting portions 12. . The amount by which these adjustment bolts 14 project into the space between the projections 12 is adjusted, and the adjustment bolts 14 are positioned by the fixing nuts 15. FIG. 4 shows an example in which the operation pedal 7 is adjusted so that it can be tilted only forward.
[0025]
On the other hand, as shown in FIGS. 2 and 3, the mounting flange 2 on the upper part of the valve body 1 is provided with a tilt regulating portion 16 protruding to one side. The tilt restricting portion 16 includes an L-shaped bracket 17 fixed to the mounting flange 2 and a plunger 18 mounted on an upper portion of the bracket 17. The plunger 18 is provided so as to be located on the axis of the adjusting bolt 14. In this embodiment, an index plunger capable of setting three positions is used for the plunger 18.
[0026]
The index plunger 18 has a rod member 20 that slides inside a cylindrical guide member 19, and is fixed to the rod member 20, and the rod member 20 is inserted into a fixing hole 21 provided in the support member 6. Alternatively, a handle member 22 to be detached is provided. The fixing hole 21 is located on the axis of the adjustment bolt 14 and is provided in a direction orthogonal to the axis.
[0027]
A slide groove 23 is formed in the axial direction of the guide member 19 for sliding the handle member 22, and three fixed grooves 24a, 24b, 24c are formed in the center and both ends of the slide groove 23 in the circumferential direction. Is formed. The position of the rod member 20 can be fixed by tilting the handle member 22 sideways toward the fixing grooves 24a, 24b, and 24c and locking them.
[0028]
As shown in FIG. 5 (a), a state where the rod member 20 is advanced and the handle member 22 is turned sideways at the position where the rod member 20 is inserted into the fixing hole 21 and locked in the fixing groove 24a is a locked state of the operation pedal 7. . Further, as shown in FIG. 5B, the rod member 20 is slightly retracted, its tip is separated from the fixing hole 21, and the rod member 20 is located between the axis of the adjusting bolt 14 and the opening of the fixing hole 21. The state in which the handle member 22 is locked in the fixing groove 24b is the half-lock state of the operation pedal 7. In this state, the tilt of the operation pedal 7 is restricted where the tip of the adjustment bolt 14 contacts the rod member 20. This contact position can be adjusted by changing the screwing amount of the adjusting bolt 14. Further, as shown in FIG. 5 (c), when the rod member 20 is retracted, and the handle member 22 is locked in the fixing groove 24c at a position where its tip is behind the adjustment bolt 14 (position deviated). Then, the operation pedal 7 is in an open state, and the operation pedal 7 is no longer restricted by the plunger 18.
[0029]
Therefore, in the half-locked state shown in FIG. 5B, the amount by which the tip of the adjusting bolt 14 projects inward from the projecting portion 12 is adjusted by the screwing amount, so that the adjusting bolt 14 is positioned on the axis. The tilt angle range in which the rod member 20 provided on the fixed-side plunger 18 and the end of the adjustment bolt 14 of the support member 6 abut can be adjusted arbitrarily. That is, since the stopper position of the angle at which the operating member 4 is tilted can be adjusted steplessly, the tilt angle range of the operation pedal 7 and the tilting position (stroke end position) in the front-rear direction in construction machines and the like having different specifications depending on the companies. By adjusting, an appropriate pressure characteristic can be easily set.
[0030]
As described above, the entire stopper structure for restricting the tilt angle by using the support member 6 and the plunger 18 is compactly arranged, thereby reducing the number of parts and facilitating handling such as cost and management. .
[0031]
By the way, as shown in FIG. 1, the tilting center O that tiltably supports the above-described support member 6 that supports the operation pedal 7 is provided on a vertical axis V substantially at the center of the valve body 1. The rod member 20 of the plunger 18 provided so that the adjustment bolt 14 provided on the support member 6 comes into contact with the plunger 18 is also provided substantially on the vertical axis V line at the center of the valve body 1 (FIG. 4). . That is, the support member 6 and the plunger 18 are provided at the center in the front-rear direction of the valve body 1 as shown in the figure.
[0032]
Thus, the tilt regulating portion 16 can be selectively attached to either the left or right position of the pilot valve 25.
[0033]
That is, the support member 6 is detached from the operating member 4, the operation pedal 7 is detached from the support member 6, and the support member 6 is mounted on the valve body 1 while being inverted so that the direction of the fixing hole 21 is reversed left and right. By removing the bracket 17 of the tilt control portion 16 from the mounting flange 2 and inverting the bracket 17 to fix it to the mounting flange 2 of the valve body 1, as shown in FIG. 6, the tilt control portion 16 is shown in FIG. The pilot valve 25 provided in the left and right opposite directions to the pilot valve 25 can be configured.
[0034]
As described above, the tilt restricting portion 16 protruding in the lateral direction from the valve main body 1 can be selectively attached to either the left or right position, so that it is possible to easily cope with the case where the mounting direction is restricted in terms of space. In addition, the tilt regulating portion 16 can be provided on the side that is easy to operate according to the preference of the operator, so that the type and increase of the pilot valve 25 and the complexity of management can be improved, workability can be improved, and cost can be reduced. Etc. can be achieved.
[0035]
According to the valve operating device 26 configured as described above, since the range of the tilt angle of the operation pedal 7 (operation member) can be regulated by the adjustment bolt 14, the range of the tilt angle of the operation pedal 7 can be arbitrarily set in a stepless manner. By adjusting to the position, it is possible to easily cope with a preferable setting according to the hydraulic characteristics and the like according to industrial machines (hydraulic shovels) having different specifications, thereby increasing the number of pilot valves and complicating management. It is possible to improve the operability, reduce the cost, and the like.
[0036]
Further, since the tilt angle range of the operation pedal 7 (operation member) can be easily adjusted, the pressure characteristics can be easily adjusted even on site according to the preference of the operator or the like.
[0037]
Therefore, if a valve operating device 26 capable of coping with the maximum pressure among various working machines is manufactured, the valve operating device 26 can be adjusted according to various working machines to be used, so that one type of valve operating device can be used. At 26, it is possible to cope with the specifications of various working machines and construction machines. Moreover, since the adjustment of the valve operating device 26 can be easily performed according to the working machine, the adjustment by various optional device manufacturers or the like and the adjustment at the site can be easily performed.
[0038]
Further, the support member 6 provided with the protrusion 12 constituting the tilt angle determining portion 11 of the tilt angle regulating means and the plunger 18 constituting the tilt regulating portion 16 provided on the valve body 1 are substantially at the center of the valve body 1. The plunger 18 that projects to the side of the pilot valve 25 can be reversed so that the plunger 18 can project in the opposite direction from the left or right. Since it can be mounted, it can flexibly be mounted at any position on the left or right of an industrial machine or the like having a different driver's seat, so that one pilot valve 25 can be applied to a wider variety of models.
[0039]
In the above-described embodiment, an example is shown in which the index plunger 18 that can set three positions is used. However, if the plunger that can set at least two positions of the lock position 24a and the half lock position 24b is used, the half lock can be achieved. By retracting the position of the adjustment bolt 14 to the maximum at the position 24b, the function of the open position 24c can also be achieved. These may be appropriately determined according to the use conditions and the like.
[0040]
In addition, other than the index plunger 18, one that can set the lock position and the open position of the operation member may be provided as the configuration of the tilt angle regulating unit, and is not limited to the above-described embodiment.
[0041]
Furthermore, the above-described embodiment is an embodiment, and various changes can be made without departing from the gist of the present invention, and the present invention is not limited to the above-described embodiment.
[0042]
【The invention's effect】
The present invention is implemented in the form described above, and has the following effects.
[0043]
The same valve operating device can be used by adjusting the tilt angle of the operating means according to different specifications and pressure characteristics depending on the construction machine etc. and the working machine, so the number of pilot valves can be reduced and the cost required for pilot valve management and manufacturing It is possible to reduce the number of components and to facilitate the selection and installation of the pilot valve.
[Brief description of the drawings]
FIG. 1 is a side view of a pilot valve showing one embodiment of the present invention.
FIG. 2 is a front view of the pilot valve shown in FIG.
FIG. 3 is a plan view of the pilot valve shown in FIG. 1;
FIG. 4 is a view as viewed from an arrow A shown in FIG. 2;
FIGS. 5A and 5B are schematic views showing a use state of the fixing hole shown in FIG. 2, in which FIG. 5A is a lock position, FIG. 5B is a half lock position, and FIG.
FIG. 6 is a plan view showing a state where the valve operating device of the pilot valve shown in FIG. 1 is inverted.
FIG. 7 is a side view showing a conventional hydraulic pilot valve.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Valve body 2 ... Mounting flange 3 ... Floor surface 4 ... Working member 5 ... Dustproof cover 6 ... Support member 7 ... Operation pedal 8 ... Bolt 9 ... Mounting bracket 10 ... Bolt 11 ... Angle determining part 12 ... Projection part 13 ... Screw Part 14 ... Adjustment bolt 15 ... Fixing nut 16 ... Tilt regulating part 17 ... Bracket 18 ... Plunger 19 ... Guide member 20 ... Rod member 21 ... Fixing hole 22 ... Handle member 23 ... Slide groove 24 ... Fixing groove 25 ... Pilot valve 26 ... Valve operating device O: tilting center V: vertical axis

Claims (7)

Operating means for adjusting the degree of opening of the flow passage of the valve body by tilting, and tilt angle restricting means for restricting the tilt angle of the operating means, wherein the tilt angle restricting means inhibits tilting of the operating means; A valve operating device configured to be switchable between a restraining state and a tilting state in which the operating means restricts tilting within a predetermined angle range. The tilt angle restricting means includes a tilt restricting portion fixed to the valve body side and a tilt angle determining portion that tilts together with the operating means, and the tilt angle determining portion abuts on the tilt restricting portion to tilt. 2. The valve operating device according to claim 1, further comprising an adjusting member for adjusting an angle range. The operating means comprises a support member that adjusts the flow path opening of the valve body, and an operation member that tilts integrally with the support member, and the tilt angle determination portion is provided on the support member. 3. The valve operating device according to claim 2, wherein The tilt restricting portion is constituted by a plunger which can select at least a restrained state of the operation means and a tilt state in which the operation means is restricted at a predetermined angle and can be tilted in one or both directions. The valve operating device according to claim 2 or 3. The valve operating device according to claim 3 or 4, wherein the adjusting member is configured by an adjusting bolt that can move forward and backward in a direction of adjusting the tilt angle range by contacting the tilt regulating portion. A pilot valve, wherein the valve operating device according to any one of claims 1 to 5 is mounted on an upper portion of the valve body. The tilt center of the operating means and the tilt angle regulating means are provided on a vertical axis substantially at the center in the front-rear direction of the valve body, and the operating means and the tilt angle regulating means are mounted by being inverted from the left and right sides of the valve body. 7. The pilot valve according to claim 6, wherein the pilot valve is configured to perform the following.

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