JP2021107648A - Control limit device and working machine therewith - Google Patents

Abstract

To provide a control limit device allowing a spool of a mechanical control valve to be securely locked at a neutral position.SOLUTION: A control limit device E locking a spool 27 of a mechanical control valve C at a neutral position in operation stop of a working machine composing body B is arranged on the working machine which comprises the working machine composing body B driven by a hydraulic device A and a hydraulic control device D having a control valve C supplying/discharging a pressured oil to/from the hydraulic device A through operation of a control member, wherein the hydraulic control device D has a swing member of which a first arm part interlocked and connected to the spool and a second arm part interlocked and connected on the control member are projected from a pivotably supporting part, which comprises an engaging member G moving in a direction orthogonal to a swing direction of a swing member F and a member Fa to be engaged on the swing member which limits swing of the swing member F through engagement upon movement of the engaging member G.SELECTED DRAWING: Figure 1

Description

The present invention relates to an operation control device for regulating the operation of a control valve and a working machine provided with the operation control device.

Conventionally, in a work machine such as a backhoe, a plurality of work machine components operated by the hydraulic device, a hydraulic control device having a control valve for supplying and discharging pressure oil to the hydraulic device by operating an operating member, and a work machine structure. Some are equipped with an operation control device that locks the spool of the mechanical control valve to the neutral position when the operation is stopped.
In the safety device for a working vehicle disclosed in Patent Document 1, a safety device is provided as an operation control device in order to prevent unintentional movement of the mechanical control valve for traveling. This safety device is configured to provide a protruding pin on the base end side of the control lever and engage the recess of the swing plate with the protruding pin so as to be able to engage and disengage from above to regulate the movement of the control lever. There is.

Further, in order to prevent the spool of the mechanical control valve from moving unintentionally, in the safety device for the working vehicle disclosed in Patent Document 2, the mechanical control valve that controls the hydraulic traveling motor of the traveling vehicle is used. It has a lock lever that is operated when the traveling vehicle is kept stopped, and a neutral locking means that locks the spool of the mechanical control valve to a neutral position by operating the lock lever. The neutral locking means is a spool. It has an engaging portion formed in the above, and a locking body that retracts when the lock lever is not operated and protrudes when the lock lever is operated to engage with the engaging portion (claim 2).

Jikkenhei 6-40064 JP-A-2002-98229

In the technique of Patent Document 1, since the recess of the swing plate is engaged with the protruding pin of the control lever from above, the operation of the control lever can be regulated, but both the control lever and the swing plate swing in substantially the same direction. Therefore, the swing plate is likely to come off, and if there are a plurality of control levers, the swing plate must be arranged for each control lever.
In addition, it is difficult to adopt the control valve unless it is close to the control lever, and if the control valve is located away from the control lever near the cockpit, a cable or an interlocking rod is required. Many errors such as cable elongation are likely to occur in the control valve spool movement regulation, and it becomes difficult to achieve more reliable spool movement regulation.

According to the technique of Patent Document 2, the neutral locking means for locking the spool of the control valve to the neutral position is the engaging portion formed on the spool and retracts when the lock lever is not operated and protrudes when the lock lever is operated. Since the spool has a lock body that engages with the lock body and the spool is directly locked by the lock body, more reliable spool movement regulation can be achieved, but a neutral locking means must be incorporated for each control valve. The configuration is complicated, and the control valve has a unique configuration, which makes it expensive.

The present invention has been made to solve such a problem of the prior art, and provides an operation control device capable of reliably locking the spool of a mechanical control valve to a neutral position, and a working machine provided with the operation control device. The purpose is.

Specific means for solving the problems in the present invention include a work machine configuration operated by a hydraulic device and a hydraulic control device having a control valve for supplying and discharging pressure oil to the hydraulic device by operating an operating member. Then, the hydraulic control device is provided in a working machine having a swing member in which a first arm portion interlocked with a spool from a pivotal support portion and a second arm portion interlocked with an operating member are projected. An operation control device that locks the spool of the control valve to a neutral position when the operation of the work equipment component is stopped, and includes an engaging member that moves in a direction orthogonal to the swing direction of the swing member. It has an engaged portion on the swing member that engages when the engaging member moves and regulates the swing of the swing member.

According to the present invention, by moving the engaging member in a direction orthogonal to the swinging direction of the swinging member, the engaging member is engaged with the engaged portion on the swinging member to restrain the swinging of the swinging member. The movement of the spool of the mechanical control valve can be restricted, and the control valve can be reliably locked to the neutral position in the vicinity of the spool of the control valve without having a unique configuration.

It is a perspective view of the operation control apparatus which shows the embodiment of this invention. It is a front view when the operation regulation device is locked. It is the same plan view. FIG. 3 is a cross-sectional view taken along line XX of FIG. It is a front view when the swing regulation of an operation regulation device is lifted. It is a perspective view which shows the control valve block of the operation control device and the hydraulic control device. It is a front view which shows the operation regulation device and the control valve block. It is a front view which shows the main part of the operation control device and a control valve block. It is sectional drawing which corresponds to the YY line of FIG. It is an overall plan view of a working machine. It is an overall side view of a working machine. It is the whole hydraulic circuit diagram of a working machine. It is the hydraulic circuit diagram of the main part provided with the operation control device.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In FIGS. 10 to 13, a backhoe is illustrated as the working machine 1. The backhoe 1 is mainly composed of an upper swivel base 52, a lower traveling device 53, a cabin 54 on the swivel base 52, and the like.
The traveling device 53 is provided with a rubber crawler type traveling body driven by hydraulic traveling motors 3L and 3R on the left and right sides of the machine body 53a, and is provided with a dozer (blade) 55 at the front portion of the machine body 53a. ..

The swivel table 52 is supported on the traveling device 53 so as to be swivel left and right around a swivel center (axis center) S in the vertical direction, and a front working device (excavation device) 57 is provided in front of the swivel table 52.
The rear part of the swivel table 52 has a counterweight 59 for balancing the weight with the front work device 57 and the like, and the engine 13, the radiator 68, the multiple hydraulic pumps P and the like are arranged on the rear side of the swivel table 52. These are covered by the bonnet 61.

Further, on the right side of the swivel table 52, a hydraulic oil tank 70 for storing the pressure oil of the hydraulic equipment, a large number of control valves C for controlling the hydraulic equipment, and the like are arranged, and these are covered by the tank cover 62.
A support bracket 63 is provided on the front portion of the swivel base 52, and the swing bracket 64 is supported on the support bracket 63 so as to swing left and right around the axis in the vertical direction.

The front working device 57 includes a boom 65 whose base side is swingably supported by the swing bracket 64, an arm 66 whose base side is swingably supported by the tip side of the boom 65, and a squeeze on the tip side of the arm 66. -It is configured to include a bucket 67 supported so that it can be dumped, and can be operated by a boom cylinder 4, an arm cylinder 6, and a bucket cylinder 5, which are made of hydraulic cylinders, respectively.

In the cabin 54 on the swivel table 52, the driver's seat 58 is arranged substantially in the center, and in front of the driver's seat 58, the traveling control levers 71L and 71R for operating the left and right traveling devices 53 separately are arranged for driving. The cockpits (control devices) 72L and 72R are arranged on the left and right sides of the seat 58.
The cockpit 72R on the right side includes a boom / bucket operating member 76 that operates the boom 65 and the bucket 67, a dozer operating member 77 that operates the dozer 55, an accelerator lever 78 that controls the rotation of the engine, and a right lock. It is equipped with a lever 79R.

By operating the right lock lever 79R upward, the changeover switch 83R is operated to switch off the unload valve 18 described later, and the boom 65 and the bucket 67 cannot be operated by the boom / bucket operating member 76. And.
Further, a pilot operation valve 19R for controlling the control valve C for the boom cylinder 4 and the bucket cylinder 5 is mounted and supported on the right cockpit 72R, and the boom bucket is operated so as to operate the pilot operation valve 19R. An operating member 76 is provided.

The left cockpit 72L is provided with a swivel motor 7 for swiveling the swivel 52 around the swivel center S, a swivel / arm operating member 80 for operating the arm 66, and a left lock lever 79L.
By operating the left lock lever 79L upward, the changeover switch 83L is operated to switch off the unload valve 18 described later, and the left control pedestal 72L is rotated upward, and the left lock lever 79L is used for turning and arming. The swivel motor 7 and the arm 66 cannot be operated by the operating member 80.

The pilot operating valve 19L that controls the control valve C for the swivel motor 7 and the arm cylinder 6 is mounted and supported on the left control base 72L, and the swivel / arm operating member 80 is operated so as to operate the pilot operating valve 19L. Is provided.
A traveling device 53 driven by left and right hydraulic traveling motors 3L and 3R, a swivel table 52 mounted on the traveling device 53 so as to be swivel via a swivel motor 7, and a traveling device 53 that can be raised and lowered via a dozer cylinder 9. A dozer 55 mounted on the swing bracket 52, a swing bracket 64 mounted on the swivel table 52 so as to swing freely via a swing cylinder 8, a boom 65 mounted on the swing bracket 64 so as to be able to move up and down via a boom cylinder 4, and this boom. An arm 66 movably supported by an arm cylinder 6 via an arm cylinder 6, a bucket 67 movably supported by the arm 66 via a bucket cylinder 5, and a service actuator connected to a swivel base 52 via a hydraulic hose. 10 and the like are working machine components B.

Therefore, the hydraulic actuators of the left and right traveling motors 3L, 3R, the swivel motor 7, the dozer cylinder 9, the swing cylinder 8, the boom cylinder 4, the bucket cylinder 5, and the service actuator 10 operate the work machine component B. Is.
Control valves C1 to C9 corresponding to each of the hydraulic devices A, traveling control levers 71L and 71R for operating the control valves C1 to C9, a swivel / arm operating member 80, and a swing pedal 75 (shown in FIG. 12). , The operating member 77 for the dozer, the operating member 76 for the boom / bucket, the operating member such as the switching lever 10a (shown in FIG. 12) of the service actuator 10, and the interlocking means 74 for transmitting the operation of the operating member to the control valves C1 to C9. The hydraulic control device D is configured by the above.

In the hydraulic system of the back ho 1 shown in FIGS. It is supplied to the swivel motor 7 via the control valve C7, supplied to the traveling motors 3L and 3R of the crawler type left and right traveling device 53 via the control valves C1 and C2, and supplied to the dozer cylinder 9 via the control valve C9. , Supply to the arm cylinder 6 via the control valve C6, supply to the boom cylinder 4 via the control valve C4, supply to the bucket cylinder 5 via the control valve C5, and to the swing cylinder 8 via the control valve C8. It is supplied and supplied to the service actuator (attachment) 10 via the control valve C10.

The service actuator 10 is a breaker, auger, cutter, or the like, and is detachably connected to the service port 14 of the backhoe via a hose.
The control valves C4, C5, C6, and C7 are of the hydraulic pilot switching type, and the pressure oil from the pilot pressure hydraulic pump P4 is the traveling speed switching valve 17 for changing the angle of the inclined plate, the unload valve 18, and the pilot operated valve 19L. It is supplied to the control valves C4, C5, C6 and C7 via 19R.

The pilot pressure supply oil passage 22 communicating with the unload valve 18 is also connected to the pilot operated valves 19L and 19R and the operation regulating device E.
The control valves C1, C2, C8, C9, and C10 are manually operated switching type, the traveling control valves C1 and C2 are operated by the traveling control levers 71L and 71R, and the control valve C10 is operated by the service port switching lever. , The control valve C8 is operated by a swing pedal (not shown), and the control valve C9 is operated by a dozer operating member 77.

Since the control valve C8, the control valve C9, and the control valve C10 are mechanical control valves and are arranged on the swivel table 52 away from the vicinity of the driver's seat 58, the control valve C8, the swing pedal, and the control are controlled. The valve C9 and the operating member 77 for the dozer, the control valve C10 and the service port switching lever are interlocked and connected via interlocking means 74 such as an arm, a link, a swing member, and a push-pull cable, and the control valve and its spool are interlocked and connected. It is related to the operating member that pushes and pulls.

FIG. 9 shows a control valve C9 for a dozer as an example. A spool 27 is slidably inserted into the valve body 28, and the main flow path 29 is moved from the neutral position to the left / right switching position. Can be switched and communicated between the normal rotation flow path 30 and the reverse rotation flow path 31.
In FIG. 9, the spool 27 is in the neutral position, and the forward rotation flow path 30 and the reverse rotation flow path 31 communicate with the discharge path 32. The spool 27 has a neutral return spring 35 on the side opposite to the end portion connected to the interlocking means 74, and is always urged in the neutral position direction.

In FIGS. 1 to 9 and 12 and 13, hydraulic devices A such as left and right traveling motors 3L and 3R, swivel motor 7, dozer cylinder 9, swing cylinder 8, boom cylinder 4, bucket cylinder 5, arm cylinder 6 and service actuator 10. The control valves C1 to C10 for operating each of the control valves C1 to C10 are stacked (superposed) in the vertical direction to form one control valve block H, which is arranged next to the hydraulic oil tank 70.

The hydraulic oil tank 70 has a pair of left and right fixed legs 45 at the bottom thereof, and is attached to the swivel base 52 via the fixed legs 45. The fixing bracket 46 is fixed in a rising shape over the left and right fixing legs 45, a vertical plate 47 is erected on the fixing bracket 46, and a control valve block H is attached to the vertical plate 47.
The vertical plate 47 is a partition plate that separates the control valve block H and the hydraulic oil tank 70, and the upper portion thereof is also connected to the hydraulic oil tank 70. A support frame 40 having an L-shape in a plan view is attached to the side portion of the hydraulic oil tank 70 (the protruding side of the spool 27 of the control valve C10), and one end of the support frame 40 is also connected to the vertical plate 47. ing. The support frame 40 supports a swing member F that relays the operation of the hydraulic control device D, an operation control device E that locks the swing of the swing member F, and the like.

The control valve block H is provided with an inlet portion H1 at the lower portion and an outlet portion H2 at the upper portion, and a plurality of control valves C1 to C10 are superposed and vertically arranged between the inlet portion H1 and the outlet portion H2. ing.
In the embodiment, the service actuator 10 compatible control valve C10 is superposed on the inlet portion H1, and the dozer cylinder 9 compatible control valve C9 and the swing cylinder 8 compatible control valve C8 are superposed on the service actuator 10 compatible control valve C10. It is located at a relatively low level.

The control valve block H is located above the swing cylinder 8 compatible control valve C8, and is compatible with the swivel motor 7 compatible control valve C7, the arm cylinder 6 compatible control valve C5, the left and right traveling motors 3L, and the 3R compatible control valves C1, C2, and the boom cylinder 4. The control valve C3 and the control valve C4 corresponding to the bucket cylinder 5 are arranged.
A control valve C10 corresponding to the service actuator 10 is superposed on the upper side of the control valve C4, and the spools 27 of the control valve C8 corresponding to the swing cylinder 8 and the control valve C9 corresponding to the dozer cylinder 9 are substantially parallel to each other from the valve body 28. It projects to the left (facing the left cockpit 72L), and a link 36 is connected to the tip of each.

The support frame 40 is provided with support plate portions 40a protruding horizontally and outward at two locations above and below. A support shaft 38 is fixed to the upper and lower support plate portions 40a, and the support shaft 38 has three upper and lower stages. The swing member F is pivotally supported.
Each swing member F includes a pivot portion F1 that fits into the support shaft 38, a first arm portion F2 that protrudes forward from the pivot portion F1, and a second arm portion F3 that protrudes to the left from the pivot portion F1. The first arm portion F2 and the second arm portion F3 are located apart from each other in the axial direction of the pivotal support portion F1.

At the tip of the second arm portion F3 of the swing member F, an engaged portion Fa to which the engaging member G of the operation regulating device E is engaged is formed. The engaged portion Fa has a substantially hole shape in which the hole center is in the vertical direction. The engaged portion Fa may be a circular through hole whose center is in the vertical direction and into which the engaging portion Gc can be inserted, or may be a rectangular recess.
Each first arm portion F2 is interlocked and connected to the spool 27 via the link 36, and the second arm portion F3 is interlocked with the interlocking link 48 in the middle part in the longitudinal direction, and the first arm is pushed and pulled by the interlocking link 48. The portion F2 and the second arm portion F3 integrally swing with the support shaft 38 as the swing axis.

The swing member F in the upper stage corresponds to the swing control valve C8, and the interlocking link 48 is interlocked and connected to the swing pedal 75 via the direction change swing body 49a and the push-pull cable 50a.
The rocking member F in the middle stage corresponds to the dozer control valve C9, and the interlocking link 48 is interlocked and connected to the operating member 77 for the dozer via the direction changing rocking body 49b and the push-pull cable 50b.

The lower swing member F corresponds to the service control valve C10, and the interlocking link 48 is interlocked and connected to the switching lever 10a via the direction change swing body 49c and the push-pull cable 50c.
In each of the three direction-changing rockers 49c, two arm portions are projected from the boss portion, one arm portion is connected to the interlocking link 48, and the other arm portion is connected to the push-pull cable 50b. ..

The support shaft 51 that pivotally supports the boss portions of the direction changing rockers 49a, 49b, and 49c is projected and fixed to the side surface of the support frame 40.
The interlocking link 48 and the direction changing rocking body 49 may be omitted, and the push-pull cable 50 may be connected to the second arm portion F3 of the rocking member F.
The operation control device E is arranged in front of the second arm portion F3 of the swing member F in the longitudinal direction. The operation control device E has an engaging member G that can engage with the swinging member F, a rod-shaped support member 37 that supports the engaging member G, and swinging of the supporting member 37 with the swinging member F. An actuating device K that moves parallel to the axis, and an urging member 39 that urges the support member 37 in the direction in which the engaging member G engages with the engaged portion Fa when the actuating device K is inactive. have.

The engaging member G has three arm plates Gb in the vertical direction protruding from the outer circumference of one long common boss cylinder Ga, and an engaging portion Gc formed by a pin with a head at the tip of each arm plate Gb. It is fixed, and one guide protrusion Gd is provided on the outer circumference of the common boss cylinder Ga. The common boss cylinder Ga is fitted and fixed to the support member 37.
The lower end side of the engaging portion Gc is an engaging portion that substantially engages with the engaged portion Fa of the swing member F, and is located above the corresponding engaged portion Fa, and the engaging portion Gc. As it moves up and down, it engages with and disengages from the engaged portion Fa.

In the engaging member G, three engaging portions Gc are fixed to a common boss cylinder Ga to form an integral body, but each of the three short boss cylinders Ga has a hook shape (L-shaped). The joint portion Gc may be fixed and formed. In this case, the three engaging members G are fitted with the short boss cylinder Ga in series with the support member 37 and fixed individually, and the guide protrusions Gd are any one or two short boss cylinders. It will be provided in Ga.

The support member 37 is supported by the vertical support plate portion 40a of the support frame 40 so as to be movable in the vertical direction, and the common boss cylinder Ga of the engaging member G is fixed between the vertical support plate portions 40a. An urging member (coil spring) 39 is fitted in the lower portion of the support member 37, and the support member 37 is urged downward with respect to the lower support plate portion 40a.
A guide plate 91 is fixed vertically to the outer end portion of the upper and lower support plate portions 40a. A guide groove 93 that is long in the vertical direction is formed in the upper portion of the guide plate 91, and an operating device K is mounted in the lower portion thereof.

The operating device K has a hydraulic cylinder structure, and the piston rod Ka is concentrically located directly below the support member 37, and by supplying pressure oil to the oil chamber Kb, the support member 37 and the engagement member 39 are engaged against the urging member 39. The joint member G can be raised. An increase in the engaging member G means that the swinging member F is disengaged from the engaged portion Fa.
The operating device K is connected to the unload valve 18 via the pilot pressure supply oil passage 22, and when the unload valve 18 is on (excited state, non-unloaded state), the pilot pressure oil is supplied to the oil chamber Kb. Since it is supplied, the piston rod Ka protrudes to raise the support member 37 and the engaging member G, and disengage the engaging member G from the engaged portion Fa.

On the other hand, when the unload valve 18 is switched off (degaussing state, unloading state), the pilot pressure of the operating device K is released, so that the supporting member 37 is lowered by the urging force of the urging member 39 and engaged. The member G descends and is engaged with the engaged portion Fa.
The swinging member F swings (swings substantially in the horizontal direction) with the support shaft 38 as the swinging axis, and the engaging member G moves in the axial direction of the support member 37 parallel to the support shaft 38. The joining member G moves in a direction orthogonal to the swinging direction of the swinging member F, and when the engaging member G moves (descends), it engages with the engaged portion Fa and is an operation restricting device. The swing of the swing member F is regulated by E.

Since the swinging direction of the swinging member F and the engaging / disengaging direction of the engaging member G are orthogonal to each other, even if a swinging force is applied to the swinging member F from the operating member, the force to disengage the engaging member G is applied. It becomes difficult to convert, and the swing regulation of the swing member F can be surely performed.
When the swing member F is swing-regulated by the operation control device E, the spool 27 of the control valve C is maintained in a locked state at the neutral position, and unintentional movement of the control valve C is more reliably prevented. Will be done.

Regarding the arrangement / arrangement relationship of the control valve block H, the swing member F, and the engaging member G, the plurality of control valves C8, C9, and C10 of the control valve block H are vertically overlapped and the spool 27 protrudes. In the vicinity of the side, support shafts 38 that pivotally support a plurality of swinging members F are arranged with their axes oriented in the vertical direction, whereby the swinging direction of the swinging members F is set to be substantially horizontal. The support member 37 that supports the engaging member G corresponding to the swinging member F is arranged with the longitudinal direction in the vertical direction, whereby the moving direction (engagement direction) of the engaging member G is set in the vertical direction. , These are compactly arranged in a long space in the vertical direction adjacent to the hydraulic oil tank 70.

The polymerization direction of the control valves C8, C9, and C10, the axial direction of the support shaft 38, and the engagement direction of the engaging member G can be set to a substantially horizontal direction (horizontal direction).
The work machine (back ho) 1 shown in the embodiment is the work of the dozer 55, the swing bracket 64, the service actuator 10, and the like operated by the hydraulic device A such as the dozer cylinder 9, the swing cylinder 8, and the hydraulic actuator of the service actuator 10. The machine component B, the hydraulic control device D having a control valve C for supplying and discharging the pressure oil to the hydraulic device A by operating the operation members such as the swing pedal 75, the operating member 77 for the dozer, and the switching lever 10a, and the working machine component. The operation control device E that locks the spool 27 of the control valve C to the neutral position when the operation of B is stopped is provided, and the hydraulic control device D is the first arm portion F2 that is interlocked and connected from the pivot branch F1 to the spool 27. And the second arm portion F3 that is interlocked and connected to the operating member. -Has a projecting rocking member F. In the operation regulating device E, the engaging member G that moves in a direction orthogonal to the swinging direction of the swinging member F and the engaging member G that engages when the engaging member G moves and engages with the swinging member F. It has an engaged portion Fa on the swing member F that regulates swing.

With this configuration, the engaging member G engages with the engaged portion Fa on the swinging member F to restrain the swinging of the swinging member F and restrict the movement of the spool 27 of the control valve C. The control valve C can be reliably locked to the neutral position in the vicinity of the spool 27 of the control valve C without having a unique configuration.
Further, in the operation regulating device E, each of the swinging members F connects the first arm portion F2 and the spool 27 of the control valve C via a link 36, and connects the first arm portion F3 to the second arm portion F3. The engaged portion Fa is formed, and the engaging member G has an engaging portion Gc that moves in parallel with the swing axis of the rocking member F, and the engaged portion Fa and the engaging portion Fa are engaged. The portion Gc is a hole or recess on which one is a pin and the other is engaged with the pin.

With this configuration, even if the first arm portion F2 and the spool 27 are connected by the link 36, the engaging portion Gc of the engaging member G engages with the engaged portion Fa on the swinging member F, so that there is play. Can be reduced, and the swing of the swing member F can be reliably regulated.
Further, the operation control device E has a plurality of the working machine components B operated by the hydraulic device A, and the control valves C8, C9, and C10 corresponding to the respective working machine components B are polymerized. The swing member F to which the first arm portion F2 is connected to the spool 27 of each of the control valves C8, C9, and C10 is pivotally supported on one support shaft 38. The engaging member G corresponding to the swing member F is supported by a support member 37 parallel to the support shaft 38.

With this configuration, the swinging members F of the plurality of control valves C8, C9, and C10 can be swing-regulated at the same time by the plurality of engaging members G on one support member 37.
Further, in the operation control device E, the plurality of control valves C8, C9, and C10 are vertically overlapped and arranged, and the support shaft 38 is arranged in the vertical direction to cause the swing member F to swing in the swing direction. Is set in a substantially horizontal direction, and the support member 37 is arranged in the vertical direction to set the moving direction of the engaging member G in the vertical direction.

With this configuration, the arrangement of the plurality of control valves C8, C9, C10, the plurality of swinging members F, and the plurality of engaging members G can be made compact to save space.
Furthermore, in the operation restricting device E, a support member 37 that supports the engaging member G, an operating device K that moves the support member 37 in parallel with the swing axis of the swing member F, and the operating device K. It has an urging member 39 that urges the support member 37 in a direction in which the engaging member G engages with the engaged portion Fa when the operating device K is inactive.

With this configuration, the support member 37 supporting the engaging member G can be moved in the engaging direction by the operation of the operating device K, and the engaging member G is engaged by the urging member 39 when the operating device K is not activated. The support member 37 can be urged in the direction of engaging with the joint portion Fa.
Further, in the work machine 1 provided with the operation control device E, the work machine component B is driven by the hydraulic traveling motors 3L and 3R, and the traveling device 53 is connected to the traveling device 53 via the swivel motor 7. A swivel 52 mounted so as to be swivelable, a dozer 55 mounted on the traveling device 53 so as to be able to move up and down via a dozer cylinder 9, and a swing mounted swivelly on the swivel via a swing cylinder 8. A bracket 64, a boom 65 supported by the swing bracket 64 so as to be able to move up and down via a boom cylinder 4, an arm 66 supported by the boom 65 so as to be raised and lowered via an arm cylinder 6, and a bucket to the arm 66. The bucket 67 is supported so as to be able to move up and down via the cylinder 5, and the service actuator 10 is connected to the swivel base 52 via a hydraulic hose. 7. Dozer cylinder 9, swing cylinder 8, boom cylinder 4, bucket cylinder 5, and service actuator 10. The flood control device D has the control valves C corresponding to each of the flood control devices A superposed. Moreover, it has the swing member F corresponding to at least two of the control valve C9 corresponding to the dozer cylinder 9, the control valve C8 corresponding to the swing cylinder 8, and the control valve C10 corresponding to the service actuator 10. A support frame 40 is provided on the swivel base 52, and one support shaft 38 that pivotally supports the at least two swing members F is supported on the support frame 40, and at least two engagement members G are mounted on the support frame 40. A support member 37 is supported in parallel with the support shaft 38, and an operating device K for moving the support member 37 in parallel with the support shaft 38 is attached.

With this configuration, the support member 37 and the operating device K can be arranged in common with the support frame 40 that supports the support shaft 38 of the swing member F, and the configuration of the operation control device E can be simplified and made compact. Can be done.
In the present invention, the shape of each member and the positional relationship between the front and rear, the left and right, and the top and bottom of each member in the above embodiment are not limited to the configurations shown in FIGS. , You can also change the combination.

For example, the mechanical control valve that locks the spool 27 in the neutral position may be one or two of the dozer cylinder 9 compatible control valve C9, the swing cylinder 8 compatible control valve C8, and the service actuator 10 compatible control valve C10. good.
Control valves C1 and C2 for left and right traveling motors 3L and 3R, control valves C8 for swing cylinder 8, control valve C3 for boom cylinder 4, control valve C4 for bucket cylinder 5, control valve C5 for arm cylinder 6, etc. A mechanical control valve may be adopted in the above, and a swing member F and an engagement member G corresponding to them may be arranged so that the spool 27 of the mechanical control valve can be restricted in movement by the operation control device E.

Further, the vertical arrangement of the plurality of control valves C1 to C10 may be appropriately changed. In order to reduce the mounting space of the operation control device E, it is more preferable to continuously arrange the mechanical control valves that lock the spool 27 in the neutral position.
The piston rod Ka of the operating device K communicates with the unload valve 18 and moves by pilot pressure, but it is configured to move by an electromagnetic solenoid and switches on / off in conjunction with the unload valve 18. It may be manipulated.

The rocking member F may project one plate member from the pivotal support portion F1 and form a first arm portion F2, a second arm portion F3, and an engaged portion Fa on this plate material, or may be engaged. The engaging member G may be formed by forming the portion Fa with pin-shaped protrusions, forming the engaging portion Gc as a hole to be fitted into the pin-shaped protrusion, and fixing a plate material having this hole to the boss cylinder Ga. ..
Although the backhoe is illustrated as the working machine 1, it may be a working machine such as a wheel loader, a front loader, or a combine.

1 Working machine (backhoe)
3 (3L, 3R) Traveling motor 8 Swing cylinder 9 Dozer cylinder 10 Service actuator 18 Unload valve 27 Spool 28 Valve body 36 Link 37 Support member 38 Support shaft 39 Bias member 40 Support frame 40a Support plate part 41 Piston oil passage 45 Fixed leg 46 Fixed bracket 47 Vertical plate 48 Interlocking link 51 Support shaft 70 Hydraulic oil tank 91 Guide plate 93 Guide groove A Hydraulic device B Work machine configuration C (C1 to C10) Control valve D Hydraulic control device E Operation control device F Swing Member F1 Pivot branch F2 Arm part F3 Arm part Fa Engagement part G Engagement member Ga Boss cylinder Gb Arm plate Gc Engagement part Gd Guide protrusion H Control valve block K Actuator Ka Piston rod Kb Oil chamber

Claims (7)

It has a work machine configuration operated by a hydraulic device and a hydraulic control device having a control valve for supplying and discharging pressure oil to the hydraulic device by operating an operating member, and the hydraulic control device is transferred from a pivot to a spool. The first arm portion that is interlocked and connected and the second arm portion that is interlocked and connected to the operation member are provided in a work machine having a projecting swing member, and the control is performed when the operation of the work machine component is stopped. An operation control device that locks the valve spool to the neutral position.
An engaging member that moves in a direction orthogonal to the swinging direction of the swinging member, and a cover on the swinging member that engages when the engaging member moves to regulate the swinging of the swinging member. An operation control device having an engaging portion. Each of the swinging members connects the first arm portion and the spool of the control valve via a link, and forms the engaged portion on the second arm portion. It has an engaging portion that moves in parallel with the swing axis of the swing member, and the engaged portion and the engaging portion are holes or recesses in which one is a pin and the other is engaged with the pin. The operation control device according to claim 1. The work machine has a plurality of the work machine components operated by the hydraulic device, and the control valves corresponding to the respective work machine components are superposed and arranged.
The swing member to which the first arm portion is connected to the spool of each control valve is pivotally supported on one support shaft.
The operation regulating device according to claim 1 or 2, wherein the engaging member corresponding to each swinging member is supported by a support member parallel to the support shaft. The plurality of control valves are superposed in the vertical direction.
The support shaft is arranged in the vertical direction, and the swing direction of the swing member is set to be substantially horizontal.
The operation control device according to claim 3, wherein the support member is arranged in the vertical direction and the moving direction of the engaging member is set in the vertical direction. A support member that supports the engaging member, an actuating device that moves the supporting member in parallel with the swinging axis of the swinging member, and an engaging member that engages with the engaging member when the actuating device is inactive. The operation control device according to any one of claims 1 to 4, further comprising an urging member that urges the support member in a direction of engaging with the joint portion. A working machine provided with the operation control device according to any one of claims 1 to 5. The work machine component includes a traveling device driven by a hydraulic traveling motor, a swivel table mounted on the traveling device so as to be swivelly mounted via a swivel motor, and the traveling device mounted on the traveling device so as to be able to move up and down via a dozer cylinder. A dozer, a swing bracket mounted on the swivel base so as to swing freely via a swing cylinder, a boom supported on the swing bracket so as to be able to move up and down via a boom cylinder, and a boom attached to the boom via an arm cylinder. An arm that is supported up and down, a bucket that is supported by the arm via a bucket cylinder, and a service actuator that is connected to a swivel base via a hydraulic hose.
The hydraulic device is the left / right traveling motor, a swivel motor, a dozer cylinder, a swing cylinder, a boom cylinder, a bucket cylinder, and a service actuator.
The hydraulic control device has the control valves corresponding to each of the hydraulic devices in an overlapping manner, and is included in the dozer cylinder compatible control valve, the swing cylinder compatible control valve, and the service actuator compatible control valve. It has the rocking member corresponding to at least two, and has.
A support frame is provided on the swivel base, and one support shaft that pivotally supports the at least two swinging members is supported on the support frame, and a support member that mounts at least two engaging members is supported on the support frame. The working machine according to claim 6, wherein the working machine is equipped with an operating device that supports the support member in parallel with the support member and moves the support member in parallel with the support shaft.

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