JP7225085B2 - Operation control device and work machine equipped with it - Google Patents

Description

TECHNICAL FIELD The present invention relates to an operation restricting device that restricts the operation of a control valve and a working machine equipped with the same.

Conventionally, in a work machine such as a backhoe, a plurality of work machine components operated by a hydraulic device, a hydraulic control device having a control valve for supplying and discharging pressurized oil to the hydraulic system by operating an operating member, and a work machine structure. and an operation restricting device that locks the spool of the mechanical control valve in a neutral position when operation is stopped.
In the safety device for a working vehicle disclosed in Patent Document 1, a safety device is provided as an operation restricting device in order to prevent unintentional movement of a mechanical control valve for traveling. This safety device is constructed such that a protruding pin is provided on the base end side of the control lever, and the recess of the rocking plate is detachably engaged with the protruding pin from above, thereby restricting the movement of the control lever. there is

In order to prevent the spool of the mechanical control valve from unintentionally moving, the safety device for the working vehicle disclosed in Patent Document 2 includes a mechanical control valve for controlling the hydraulic traveling motor of the traveling vehicle. a lock lever operated when the traveling vehicle is kept stopped; and neutral lock means for locking the spool of the mechanical control valve in a neutral position by operating the lock lever, wherein the neutral lock means is the spool. and a locking body that retracts when the lock lever is not operated and projects to engage with the engaging part when the lock lever is operated (claim 2).

Japanese Utility Model Laid-Open No. 6-40064 JP-A-2002-98229

In the technique disclosed in Patent Document 1, the concave portion of the rocking plate is engaged with the protruding pin of the control lever from above, so that the operation of the control lever can be restricted, but the control lever and the rocking plate rock in substantially the same direction. Therefore, the swing plate is likely to come off, and if there are a plurality of control levers, a swing plate must be arranged for each control lever.
In addition, if the control valve is not close to the control lever, it is difficult to adopt the configuration. In restricting the movement of the spool of the control valve, errors such as elongation of many cables are likely to occur, making it difficult to achieve more reliable spool movement restriction.

In the technique disclosed in Patent Document 2, the neutral lock means for locking the spool of the control valve in the neutral position consists of an engaging portion formed on the spool, and the engaging portion retracts when the lock lever is not operated and protrudes when the lock lever is operated. Since the spool is directly locked by the lock body, it is possible to achieve more reliable spool movement regulation. The design is complicated and the control valve has a unique design, which makes it expensive.

SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the prior art, and provides an operation restricting device capable of securely locking the spool of a mechanical control valve in a neutral position, and a working machine equipped with the same. for the purpose.

A specific means for solving the problem in the present invention has a working machine structure that is operated by a hydraulic system, and a hydraulic control system that has a control valve that supplies and discharges pressure oil to the hydraulic system by operating an operating member. The hydraulic control device includes a pivot portion pivotally supported on a spindle disposed near the control valve, a first arm portion protruding from the pivot portion and interlockingly connected to a spool of the control valve , and a swinging member having a second arm portion protruding from the pivotal support portion and interlockingly connected to the operating member, the spool of the control valve when the operation of the working machine component is stopped. in a neutral position, comprising: an engaging member that moves in a direction orthogonal to the swinging direction of the swinging member; and the swinging member that engages when the engaging member moves and an engaged portion on the swinging member for restricting swinging of the swinging member, the swinging member connecting the first arm portion and the spool of the control valve via a link, The engaged portion is formed on the second arm portion, and the engaging member has an engaging portion that moves in parallel with the swing axis of the swing member. The engagement portion is a pin on one side and a hole or recess that engages the pin on the other side .

According to the present invention, by moving the engaging member in the direction orthogonal to the swinging direction of the swinging member, the engaging member is engaged with the engaged portion on the swinging member, thereby restraining the swinging motion of the swinging member. movement of the spool of the mechanical control valve can be restricted by the control valve, and can be positively locked in the neutral position near the spool of the control valve without requiring a unique configuration of the control valve. Further, even if the first arm portion and the spool are connected by a link, the engaging portion of the engaging member engages with the engaged portion on the swinging member, so that play can be reduced and the swinging of the swinging member can be reduced. movement can be regulated.

1 is a perspective view of an operation restricting device showing an embodiment of the present invention; FIG. It is a front view at the time of locking of an operation control device. It is the same top view. 4 is a cross-sectional view taken along line XX of FIG. 3; FIG. It is a front view at the time of rocking|fluctuation control cancellation|release of an operation control apparatus. FIG. 3 is a perspective view showing control valve blocks of an operation restricting device and a hydraulic control device; It is a front view showing an operation restricting device and a control valve block. It is a front view which shows the operation control apparatus and the principal part of a control valve block. FIG. 9 is a cross-sectional explanatory view corresponding to the Y-Y line of FIG. 8; 1 is an overall plan view of a working machine; FIG. 1 is an overall side view of a working machine; FIG. FIG. 2 is an overall hydraulic circuit diagram of the working machine; FIG. 3 is a hydraulic circuit diagram of a main portion provided with an operation restricting device;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.
10 to 13 exemplify a backhoe as the working machine 1. FIG. 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 includes rubber crawler-type traveling bodies driven by hydraulic traveling motors 3L and 3R on the left and right sides of the machine body 53a, and a dozer (blade) 55 on the front part of the machine body 53a. .

The swivel base 52 is supported on a travel device 53 so as to be capable of left-right swivel about a vertical swivel center (axis) S, and has a front work device (excavator) 57 at its front portion.
The rear portion of the swivel base 52 has a counterweight 59 for balancing the weight with the front working device 57 and the like.In addition, the engine 13, radiator 68, multiple hydraulic pumps P, etc. are arranged on the rear side of the swivel base 52. and these are covered by a bonnet 61 .

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

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 on the tip side of the boom 65 , and a scoop on the tip side of the arm 66 . A boom cylinder 4, an arm cylinder 6, and a bucket cylinder 5, which are hydraulic cylinders, are operable.

In the cabin 54 on the swivel base 52, a driver's seat 58 is arranged substantially in the center. On both left and right sides of the seat 58, control stands (operating devices) 72L and 72R are arranged.
A boom/bucket operation member 76 for operating the boom 65 and the bucket 67, a dozer operation member 77 for operating the dozer 55, an accelerator lever 78 for controlling the rotation of the engine, and a right lock are provided on the right control platform 72R. A lever 79R is provided.

When the right lock lever 79R is operated upward, the changeover switch 83R is actuated to turn off the unload valve 18, which will be described later. and
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 control stand 72R. An operating member 76 is provided.

The left control base 72L is provided with a turning motor 7 for turning the turning base 52 around the turning center S, a turning/arm operating member 80 for operating the arm 66, and a left lock lever 79L.
When this left lock lever 79L is operated upward, it operates a changeover switch 83L to turn off an unload valve 18, which will be described later, and rotates the left control stand 72L upward and rotates the left lock lever 79L. Operation of the turning motor 7 and the arm 66 by the operating member 80 is disabled.

A pilot operation valve 19L for controlling the control valve C for the swing motor 7 and the arm cylinder 6 is attached to and supported by the left control stand 72L. is provided.
A travel device 53 driven by left and right hydraulic travel motors 3L and 3R, a swivel base 52 mounted on the travel device 53 via a swing motor 7 so as to be rotatable, and a dozer cylinder 9 on the travel device 53 to move up and down. a dozer 55 mounted on a dozer 55, a swing bracket 64 mounted on the swivel base 52 through a swing cylinder 8 so as to be freely swingable, a boom 65 supported by the swing bracket 64 through a boom cylinder 4 so as to be vertically movable, and the boom An arm 66 supported vertically via an arm cylinder 6 by 65, a bucket 67 vertically 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 or the like is a working machine structure B. As shown in FIG.

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

In the hydraulic system of the backhoe 1 shown in FIGS. It is supplied to the swing motor 7 through the control valve C7, to the traveling motors 3L and 3R of the crawler type left and right traveling device 53 through the control valves C1 and C2, and to the dozer cylinder 9 through the control valve C9. , to the arm cylinder 6 via the control valve C6, to the boom cylinder 4 via the control valve C4, to the bucket cylinder 5 via the control valve C5, to the swing cylinder 8 via the control valve C8. 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 a service port 14 of the backhoe through a hose.
The control valves C4, C5, C6, and C7 are of a hydraulic pilot switching type, and pressure oil from the pilot pressure hydraulic pump P4 is applied to the swash plate angle changing traveling speed switching valve 17, the unload valve 18, the pilot operation valve 19L, 19R to control valves C4, C5, C6 and C7.

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

The control valve C8, the control valve C9, and the control valve C10 are mechanical control valves, and are arranged on the swivel base 52 away from the vicinity of the driver's seat 58. The valve C9 and the dozer operation member 77, and the control valve C10 and the service port switching lever are interlocked with each other through an interlocking means 74 such as an arm, a link, a swing member, and a push-pull cable. It has a relationship with an operation member that pushes and pulls.

FIG. 9 shows a dozer control valve C9 as an example. can be switched between the forward 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 passage 30 and the reverse rotation passage 31 communicate with the discharge passage 32 . The spool 27 has a neutral return spring 35 on the side opposite to the end connected with the interlocking means 74, and is always biased toward the neutral position.

1 to 9 and FIGS. 12 and 13, hydraulic devices A such as left and right travel motors 3L and 3R, swing 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 respectively operating the are vertically superimposed (superimposed) to constitute one control valve block H, and are arranged next to the hydraulic oil tank 70 .

The hydraulic oil tank 70 has a pair of left and right fixed legs 45 at its bottom and is attached to the swivel base 52 via the fixed legs 45 . A fixed bracket 46 is fixed upright across the left and right fixed legs 45 , a vertical plate 47 is erected on the fixed bracket 46 , and a control valve block H is mounted on 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 its upper portion is also connected to the hydraulic oil tank 70 . A support frame 40 having an L shape in plan view is attached to the side of the hydraulic oil tank 70 (on the side where the spool 27 of the control valve C10 protrudes). ing. The support frame 40 supports a swinging member F that relays the operation of the hydraulic control device D, an operation restricting device E that locks the swinging of the swinging member F, and the like.

The control valve block H is provided with an inlet portion H1 at its lower portion and an outlet portion H2 at its upper portion. ing.
In the embodiment, the control valve C10 corresponding to the service actuator 10 is superimposed on the inlet portion H1, and the control valve C9 corresponding to the dozer cylinder 9 and the control valve C8 corresponding to the swing cylinder 8 are superimposed thereon. It is located relatively low.

The control valve block H includes a control valve C7 corresponding to the swing motor 7, a control valve C5 corresponding to the arm cylinder 6, control valves C1 and C2 corresponding to the left/right traveling motor 3L and 3R, control valves C1 and C2 corresponding to the boom cylinder 4, and a control valve C7 corresponding to the swing cylinder 8. A control valve C3 and a control valve C4 corresponding to the bucket cylinder 5 are arranged.
A control valve C10 corresponding to the service actuator 10 is superimposed on the control valve C4, and a control valve C8 corresponding to the swing cylinder 8 and a control valve C9 corresponding to the dozer cylinder 9 located thereabove are arranged so that their spools 27 are substantially parallel to each other. It protrudes leftward (toward the left control platform 72L), and a link 36 is connected to each tip.

The support frame 40 is provided with support plate portions 40a projecting horizontally outward at two upper and lower locations. A rocking member F is pivotally supported.
Each swinging member F has a pivot portion F1 fitted to the support shaft 38, a first arm portion F2 projecting forward from the pivot portion F1, and a second arm portion F3 projecting leftward from the pivot portion F1. , and the first arm portion F2 and the second arm portion F3 are separated from each other in the axial direction of the pivot portion F1.

At the tip of the second arm portion F3 of the rocking member F, an engaged portion Fa with which the engaging member G of the operation restricting device E engages is formed. The engaged portion Fa has a substantially hole-like shape with the center extending 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 concave portion.
Each first arm portion F2 is interlocked with the spool 27 via a link 36, and an interlocking link 48 is connected to the second arm portion F3 in the middle in the longitudinal direction. The portion F2 and the second arm portion F3 are integrally rocked with the support shaft 38 as the rocking axis.

The upper swinging member F corresponds to the swing control valve C8, and the interlocking link 48 is interlocked with the swing pedal 75 via the direction changing swinging 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 coupled to the dozer operating member 77 via the direction changing rocking body 49b and the push-pull cable 50b.

The rocking member F in the lower stage corresponds to the service control valve C10, and the interlocking link 48 is coupled to the switching lever 10a via the direction changing rocking body 49c and the push-pull cable 50c.
Each of the three direction-changing rocking bodies 49c has two arms protruding from the boss, one of which is connected to the interlocking link 48, and the other of which is connected to the push-pull cable 50b. .

A support shaft 51 that pivotally supports the bosses of the direction-changing rocking bodies 49a, 49b, and 49c is fixed to the side surface of the support frame 40 so as to protrude therefrom.
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.
An operation restricting device E is arranged in front of the second arm portion F3 of the swing member F in the longitudinal direction. The operation restricting device E includes an engaging member G that can be engaged with the swinging member F, a rod-shaped support member 37 that supports the engaging member G, and a support member 37 that allows the swinging member F to swing. An actuating device K that moves parallel to the axis, and a biasing member 39 that biases the supporting member 37 in the direction in which the engaging member G engages with the engaged portion Fa when the actuating device K is not actuated. have.

The engaging member G has three arm plates Gb protruding vertically from the outer periphery 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. A single guide projection Gd is provided on the outer circumference of the common boss cylinder Ga. A 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 swinging member F, and is positioned above the corresponding engaged portion Fa, and the engaging portion Gc moves up and down to engage and disengage with the engaged portion Fa.

The engaging member G has three engaging portions Gc fixed to a common boss cylinder Ga to form an integrated body. The joining portion Gc may be fixedly formed. In this case, the three engaging members G engage the short boss cylinders Ga in series with the support member 37 and fix them individually. Ga.

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

The actuating device K has a hydraulic cylinder structure, and the piston rod Ka is positioned directly below the support member 37 concentrically. The joining member G can be raised. The lifting of the engaging member G means that the rocking member F is separated from the engaged portion Fa.
The operating device K is connected to the unload valve 18 via a pilot pressure supply oil passage 22, and when the unload valve 18 is on (excited state, non-unloaded state), pilot pressure oil is supplied to the oil chamber Kb. Since the piston rod Ka is supplied, the piston rod Ka protrudes to raise the support member 37 and the engaging member G, thereby separating the engaging member G from the engaged portion Fa.

On the other hand, when the unload valve 18 is switched off (demagnetized state, unloaded state), the pilot pressure of the actuator K is released, so that the support member 37 is lowered by the biasing force of the biasing member 39 and engaged. The member G descends and engages with the engaged portion Fa.
The swinging member F swings about the support shaft 38 (swings in a substantially horizontal direction), and the engagement 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 (lowers), it engages with the engaged portion Fa, thereby operating the operation restricting device. The rocking motion of the rocking member F is restricted by E.

Since the swinging direction of the swinging member F and the engaging/disengaging direction of the engaging member G are perpendicular to each other, even if a swinging force is applied to the swinging member F from the operation member, the force for disengaging the engaging member G is It becomes difficult to convert, and the rocking|fluctuation control of the rocking member F can be reliably performed.
Then, when the swinging member F is restricted from swinging by the operation restricting 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. be done.

The control valve block H, the oscillating member F, and the engagement member G are arranged and arranged such that the plurality of control valves C8, C9, and C10 of the control valve block H are superimposed in the vertical direction, and the spool 27 protrudes. A support shaft 38 for pivotally supporting a plurality of swinging members F is arranged in the vicinity of the side of the swinging member F with its axis extending vertically, whereby the swinging direction of the swinging member F is set substantially horizontally. A support member 37 for supporting the engaging member G corresponding to the swinging member F is arranged with its longitudinal direction in the vertical direction, so that the moving direction (disengagement direction) of the engaging member G is set in the vertical direction. , and these are compactly arranged in a vertically elongated space adjacent to the hydraulic oil tank 70 .

Note that the overlapping direction of the control valves C8, C9, and C10, the axial direction of the support shaft 38, and the disengaging direction of the engaging member G can also be set substantially horizontally (sideways).
The work machine (backhoe) 1 shown in the above embodiment includes a dozer cylinder 9, a swing cylinder 8, a dozer 55, a swing bracket 64, a service actuator 10, etc., which are operated by a hydraulic device A such as hydraulic actuators of the service actuator 10. A hydraulic control device D having a machine component B, a control valve C for supplying and discharging pressurized oil to the hydraulic device A by operating operating members such as a swing pedal 75, a dozer operating member 77, and a switching lever 10a, and a working machine component. and an operation restricting device E that locks the spool 27 of the control valve C in a neutral position when the operation of the hydraulic control device D is stopped. and a second arm portion F3 interlockingly connected to the operating member. has a protruded rocking member F; In the operation restricting device E, an engaging member G that moves in a direction perpendicular to the swinging direction of the swinging member F engages with the swinging member F when the engaging member G moves. and an engaged portion Fa on the swinging member F for restricting swinging.

With this configuration, the engaging member G engages with the engaged portion Fa on the swinging member F, restrains swinging of the swinging member F, and restricts the movement of the spool 27 of the control valve C. It is possible to reliably lock the control valve C in the neutral position near the spool 27 without requiring the control valve C to be uniquely configured.
Further, in the operation restricting device E, each swinging member F connects the first arm portion F2 and the spool 27 of the control valve C via a link 36, and connects the second arm portion F3 to the swinging member F. 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 swinging member F, and the engaged portion Fa and the engaged portion Fa are engaged. The portion Gc is a pin on one side and a hole or recess that engages the pin on the other side.

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 rocking member F, so there is no play. can be reduced, and the swinging motion of the swinging member F can be reliably regulated.
Further, the operation restricting device E has a plurality of the working machine constituents B that are operated by the hydraulic device A, and the control valves C8, C9, and C10 corresponding to the respective working machine constituents B are superimposed. The rocking member F connected with the first arm portion F2 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 rocking member F is supported by a support member 37 parallel to the support shaft 38 .

With this configuration, the swinging of the swinging members F of the plurality of control valves C8, C9, and C10 can be simultaneously restricted by the plurality of engaging members G on one support member 37. FIG.
Further, in the operation restricting device E, the plurality of control valves C8, C9, and C10 are vertically superimposed, and the support shaft 38 is vertically disposed to allow the swinging member F to swing in the swinging direction. is set substantially horizontally, and the supporting member 37 is arranged in the vertical direction so that the moving direction of the engaging member G is set 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 engagement member G, an actuator K that moves the support member 37 in parallel with the swing axis of the swing member F, and and 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 not operated.

With this configuration, when the actuator K is actuated, the support member 37 supporting the engaging member G can be moved in the engaging direction, and when the actuator K is not actuated, the urging member 39 causes the engaging member G to be engaged. The support member 37 can be biased in the direction of engagement with the joint Fa.
Further, in the working machine 1 equipped with the operation restricting device E, the working machine structure B includes a travel device 53 driven by hydraulic travel motors 3L and 3R, and a swing motor 7 connected to the travel device 53. a dozer 55 mounted on the travel device 53 via a dozer cylinder 9 so as to be movable up and down; and a swing mounted on the swivel base via a swing cylinder 8 so as to be swingable A bracket 64, a boom 65 vertically supported by the swing bracket 64 via the boom cylinder 4, an arm 66 vertically supported by the boom 65 via the arm cylinder 6, and a bucket attached to the arm 66. A bucket 67 supported vertically via a cylinder 5, and a service actuator 10 connected to a swivel base 52 via a hydraulic hose. 7, a dozer cylinder 9, a swing cylinder 8, a boom cylinder 4, a bucket cylinder 5, and a service actuator 10. The hydraulic control device D has the control valves C corresponding to the respective hydraulic devices A superimposed. and the rocking 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. The support frame 40 supports one support shaft 38 that pivotally supports the at least two rocking members F, and at least two engaging members G are mounted thereon. A support member 37 is supported in parallel with a support shaft 38, and an operating device K for moving the support member 37 in parallel with the support shaft 38 is mounted.

With this configuration, the support member 37 and the actuating device K can be arranged by sharing the support frame 40 that supports the support shaft 38 of the swing member F, and the configuration of the operation restricting device E can be simplified and made compact. can be done.
The present invention is not limited to the configurations shown in FIGS. 1 to 13 in terms of the shape of each member and the positional relationships in the front-rear, left-right, and up-down directions of each member in the above embodiment, and the members and configurations may be modified in various ways. , you can change the combination.

For example, one or 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 may be used as the mechanical control valves for locking the spool 27 at the neutral position. good.
Control valves C1 and C2 corresponding to the left and right traveling motors 3L and 3R, control valve C8 corresponding to the swing cylinder 8, control valve C3 corresponding to the boom cylinder 4, control valve C4 corresponding to the bucket cylinder 5 or control valve C5 corresponding to the arm cylinder 6, etc. , mechanical control valves may be employed, the swing member F and the engaging member G corresponding to them may be arranged, and the movement of the spool 27 of these mechanical control valves may be restricted by the operation restricting device E.

Also, the vertical arrangement of the plurality of control valves C1 to C10 may be changed as appropriate. In order to reduce the mounting space for the operation restricting device E, it is more preferable to continuously arrange the mechanical control valves for locking the spool 27 at the neutral position.
The piston rod Ka of the actuator K communicates with the unload valve 18 and is moved by the pilot pressure. It may be operated.

The oscillating member F may have a single plate protruding from the pivotal support portion F1, and the plate may be formed with the first arm portion F2, the second arm portion F3, and the engaged portion Fa. The engaging member G may be constructed by forming the portion Fa with a pin-shaped projection, forming the engaging portion Gc as a hole for fitting the pin-shaped projection, and fixing a plate material having this hole to the boss cylinder Ga. .
Although the backhoe is exemplified as the work machine 1, it may be a work machine such as a wheel loader, a front loader, or a combine harvester.

1 Work machine (backhoe)
3 (3L, 3R) travel 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 biasing member 40 support frame 40a support plate portion 41 pilot 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 structure C (C1 to C10) Control valve D Hydraulic control device E Operation restricting device F Swing Member F1 Pivot portion F2 Arm portion F3 Arm portion Fa Engaged portion G Engaging member Ga Boss tube Gb Arm plate Gc Engaging portion Gd Guide projection H Control valve block K Operating device Ka Piston rod Kb Oil chamber

Claims (7)

and a hydraulic control device having a control valve for supplying and discharging pressurized oil to and from the hydraulic device by operating an operating member, wherein the hydraulic control device is positioned in the vicinity of the control valve. a first arm portion protruding from the pivot portion and interlockingly connected to the spool of the control valve; and a first arm portion protruding from the pivot portion and interlockingly connected to the operating member. An operation restricting device provided in a work machine having a swinging member having a second arm portion that locks the spool of the control valve in a neutral position when the operation of the work machine structure is stopped,
an engaging member that moves in a direction orthogonal to the swinging direction of the swinging member; and an engaging portion ,
The rocking member 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. An engaging portion that moves in parallel with the pivot axis of the swinging member is provided, and one of the engaged portion and the engaging portion is a pin, and the other is a hole or recess that engages with the pin. Some operation control device. The work machine has a plurality of work machine constituent bodies that are operated by the hydraulic device, and the control valves corresponding to the work machine constituent bodies are arranged in a superimposed manner,
each of the control valves is provided with the rocking member, the first arm portion of which is connected to the spool of the control valve, each of the rocking members being pivotally supported on the single support shaft;
2. The operation restricting device according to claim 1 , wherein the engaging member corresponding to each swinging member is supported by a support member parallel to the support shaft . and a hydraulic control device having a control valve for supplying and discharging pressurized oil to and from the hydraulic device by operating an operating member, wherein the hydraulic control device is positioned in the vicinity of the control valve. a first arm portion protruding from the pivot portion and interlockingly connected to the spool of the control valve; and a first arm portion protruding from the pivot portion and interlockingly connected to the operating member. An operation restricting device provided in a work machine having a swinging member having a second arm portion that locks the spool of the control valve in a neutral position when the operation of the work machine structure is stopped,
an engaging member that moves in a direction orthogonal to the swinging direction of the swinging member; and an engaging portion,
The work machine has a plurality of work machine constituent bodies that are operated by the hydraulic device, and the control valves corresponding to the work machine constituent bodies are arranged in a superimposed manner,
each of the control valves is provided with the rocking member, the first arm portion of which is connected to the spool of the control valve, each of the rocking members being pivotally supported on the single support shaft;
An operation restricting device in which the engaging member corresponding to each of the rocking members is supported by a support member parallel to the support shaft. The plurality of control valves are superimposed in the vertical direction,
the support shaft is arranged in the vertical direction and the swinging direction of the swinging member is set substantially horizontally,
4. The operation restricting 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. and a hydraulic control device having a control valve for supplying and discharging pressurized oil to and from the hydraulic device by operating an operating member, wherein the hydraulic control device is positioned in the vicinity of the control valve. a first arm portion protruding from the pivot portion and interlockingly connected to the spool of the control valve; and a first arm portion protruding from the pivot portion and interlockingly connected to the operating member. An operation restricting device provided in a work machine having a swinging member having a second arm portion that locks the spool of the control valve in a neutral position when the operation of the work machine structure is stopped,
an engaging member that moves in a direction orthogonal to the swinging direction of the swinging member; and an engaging portion,
a supporting member for supporting the engaging member; an actuator for moving the supporting member in parallel with the pivot axis of the swinging member; and an urging member that urges the support member in a direction to engage the joint. A work machine comprising the operation restricting device according to any one of claims 1 to 5. The work machine structure includes a travel device driven by a hydraulic left and right travel motor, a swivel base mounted on the travel device via a swing motor so as to be rotatable, and a dozer cylinder capable of moving up and down on the travel device. a dozer attached to a dozer, a swing bracket attached to the swivel base so as to be able to swing via a swing cylinder, a boom supported by the swing bracket via a boom cylinder so that it can be lifted and lowered, and an arm cylinder attached to the boom. a bucket vertically supported by the arm via a bucket cylinder; and a service actuator connected to the swivel base via a hydraulic hose,
The hydraulic device includes the lateral travel motor, the swing motor, the dozer cylinder, the swing cylinder, the boom cylinder, the bucket cylinder and the service actuator,
The hydraulic control device has the control valves corresponding to the respective hydraulic devices arranged in a superimposed manner, and the control valve corresponding to the dozer cylinder, the control valve corresponding to the swing cylinder, and the control valve corresponding to the service actuator. having at least two corresponding rocking members,
A support frame is provided on the swivel base, and the support frame supports the single support shaft that pivotally supports the at least two rocking members, and the support member on which the at least two engaging members are mounted is mounted on the support frame. 7. The working machine according to claim 6, further comprising an operating device that supports parallel to the support shaft and moves the support member parallel to the support shaft.

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