JP2598560Y2 - Switching structure for moving up and down range of running wheels in walking machine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for switching a range of traveling wheels in a walking type working machine such as a walking type rice transplanter.

[0002]

2. Description of the Related Art In general, among walking-type working machines of this type, there is a walking-type working machine in which body control is kept constant based on elevation control of right and left traveling wheels. In the case of a walking rice transplanter, it is necessary to switch the range of elevation of the traveling wheels according to field conditions (such as Asada, Standard, and Fukada). Therefore, in the prior art, examples
For example, an elevating range switching mechanism that switches the elevating range of the traveling wheel up and down based on the replacement of the connecting pin is provided in the traveling power transmission path of the traveling wheel. Since it is difficult to replace the connecting pin, there is a problem that an auxiliary worker for supporting the airframe is required and a work place is restricted.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has been devised to provide a structure for switching the range of traveling wheels in a walk-behind working machine which can eliminate these disadvantages. In a walk-behind working machine comprising a pair of left and right side cylinders for raising and lowering the left and right traveling wheels, respectively , regulating the sliding of the piston rod and the cylinder tube of the side cylinder ,
A cylinder lock mechanism that regulates the expansion and contraction of the side cylinder
Provided, said cylinder lock mechanism, between members the piston rod is connected, provided Nishikomi connecting portion for switching the lifting range of the running wheels on the basis of changes in Nishikomi amount vertically
Together, even for a is it characterized in that it is <br/> form a gauge section for displaying the Nishikomi change in該螺write connection.

[0004]

Next, an embodiment of the present invention will be described with reference to the drawings. In the drawing, reference numeral 1 denotes a traveling body of a six-row planting walking type rice transplanter, and an engine 2 is provided in front of the traveling body 1.
And transmission case 3 are arranged,
At the rear of the fuselage, a planting work section 6 having a seedling mounting table 4, a planting mechanism 5, and the like is provided. However, an output shaft (not shown) of the transmission case 3 projecting right and left outward from the body is not provided. , Right and left running wheels 8 are connected to each other via a swing case 7 having a chain transmission mechanism therein so as to be vertically movable. Incidentally, reference numeral 9 denotes a main float provided at the bottom of the fuselage.

[0005] Reference numeral 10 denotes a main cylinder which is disposed at a substantially central portion of the body in a forwardly inclined state.
The balance arm 11 whose center is pivotally supported by the piston rod 10a is displaced to a front upper position based on a hydraulic extension operation, and is displaced to a rear lower position based on a hydraulic reduction operation. The balance arm 1 facing
The left and right end portions 1 are linked to the lower end portions of left and right link plates 13 and 14 constituting an intermediate link mechanism 12 to be described later, via a first connecting rod 15, respectively.

The intermediate link mechanism 12 connects the intermediate portion of the right link plate 14 to the right end of a horizontal shaft 16 which is rotatably supported by the body by spline coupling. The left end of the horizontal link 16 is rotatably connected to an intermediate portion of the left link plate 13. The left end of the horizontal shaft 16 further faces the outer surface of the left link plate 13. Stopper plate 1
7 are integrally welded. That is, the stopper plate 17 is provided with a long hole 17a long in the direction around the axis, while the outer surface of the left link plate 13 is provided with a stopper pin 13a which fits loosely into the long hole 17a. The left and right link plates 13 and 14 are configured to restrict the rotation in the opposite direction more than necessary, and the swing range of the balance arm 11 is set based on the configuration.

Reference numeral 18 denotes a balance lock mechanism provided on the inner side surface of the left link plate 13. The balance lock mechanism 18 is provided so as to be able to protrude and retract from the left link plate 13 so as to engage and disengage with the engagement hole 17 b of the stopper plate 17. A lock pin 19 to be supported, an elastic machine 20 for constantly urging the lock pin 19 toward the engagement side, and a connecting wire 2 to the lock pin 19.
Balance lock operating tool (not shown) connected via 1;
The connecting wire 21 includes an outer receiver 13b for fixing the outer tube 21a. That is, the independent rotation of the left and right link plates 13 and 14 is regulated based on the engagement operation of the lock pin 19 by the balance lock operating tool, and the balance arm 11 can be locked in a horizontal posture by the regulation of the rotation. It has become.

Reference numeral 22 denotes a pair of left and right second connecting rods. The second connecting rod 22 includes an arm 7 a protruding upward from a base end of the left and right swing case 7, and a left and right link plate 13. 14 are provided so as to be interlocked with the upper end. That is, the first connecting rod 15, the intermediate link mechanism 12,
The left and right traveling wheels 8 are connected via the second connecting rod 22 and the swing case 7, and the balance arm 11 moves left and right based on the parallel movement accompanying the hydraulic expansion and contraction operation of the main cylinder 10. While the wheels 8 are moved up and down in the same direction to control the elevating of the body, when an eccentric load is applied to the left and right running wheels 8 due to the left and right inclination of the body, the left and right running is performed based on the free swing of the balance arm 11. It is configured to allow the wheel 8 to be driven up and down in the opposite direction and to perform the rolling control of the aircraft in a driven manner.

Reference numeral 23 denotes a pair of left and right side cylinders each composed of a single rod type double-acting hydraulic cylinder. The side cylinders 23 are not directly connected to the The two connecting rods 22 are interposed respectively. That is, the left and right side cylinders 23
Are the left and right traveling wheels 8 based on the reciprocal hydraulic expansion and contraction operation.
Is lifted and lowered in the opposite direction to thereby perform forced rolling control of the airframe. In order to allow the free swing of the balance arm 11 even in the forced rolling control state, it is based on the hydraulic expansion and contraction operation of the side cylinder 23. The forced rolling control and the driven rolling control based on the free swing of the balance arm 11 can be performed in a combined manner.

The second connecting rod 22 includes a front rod 24 connected to the arm 7a of the swing case 7,
Rear rod part 2 connected to link plates 13 and 14
The piston rod 26 of the side cylinder 23 is formed on a screw shaft having a thread groove formed on the outer peripheral surface. At the same time, it is connected to the rear rod 25 in a threaded manner. That is, the screw connection portion 27 is normally stopped by the nut 28, but in a state where the nut 28 is loosened, the turning operation of the piston rod 26 (even after the assembly is completed because the piston rod 26 is not connected to the pipe). The screwing amount changes along with the turning operation, and based on the change in the screwing amount, the ascending / descending range of the traveling wheel 8 is adjusted in the field condition (Asada,
Standard, has become to be switched in response to the Fukada), Piscataway
As the ton rod 26 is screwed into the rear rod 25,
It corresponds to the rice field.

Reference numeral 29 denotes a gauge bar provided in parallel with the screw connection portion 27. One end of the gauge bar 29 moves integrally with the piston rod 26 in the axial direction, and rotates around the axial center. The other end of the gauge bar 29 is slidably penetrated and supported by a fixed plate 29b integrally projecting from the rear end rod 25 while being integrally connected to the rotatable movable plate 29a. I have. That is, the gauge bar 29 moves forward and backward with the turning operation of the piston rod 26, and responds to Asada, Standard, and Fukada in the screw connection portion 27 based on the forward and backward movement.
Is made as to view the changes in the Flip was Nishikomi amount. The distal end of gauge bar 29 is found, the car in order to correspond to Asada
When you set the elevation range of the wheel to the top position, that is, the piston
From the fixed plate 29b when the rod 26 is fully extended.
Gauge provided with stopper 29c for restricting escape
Unit. Therefore, a guide when switching the lifting range while contributing to improve the accuracy of the switching operations of the running wheels 8, inconvenience reliably to fall off from the rear rod 25 by operating turning unnecessarily piston rod 26 Can be prevented.

On the other hand, the rear end of the front rod portion 24 is connected to the cylinder tube 30 of the side cylinder 23. The rear end of the front rod portion 24 is formed on a screw shaft. The tube 30 is threadably connected to a screw shaft hole 30 provided at the front end of the tube 30, and is further fixed by a nut 31 so as to be prevented from rotating. For this reason, in the state where the nut 31 is loosened in the screw connection portion 30, the screwing amount changes with the turning operation of the cylinder tube 30, and based on the screwing amount change, the horizontal running wheels 8 Although it is possible to perform a feed-out adjustment (horizontal adjustment at the time of cylinder lock described later), the turning operation of the cylinder tube 30 is allowed only in a state where the pipe is not connected, so that the user's mistake after shipping from the factory is wrong. The cylinder tube 30 with the front rod 2
The inconvenience of dropping from the position 4 can be reliably prevented.

Reference numeral 33 denotes a cylinder lock mechanism provided on the side cylinder 23. The cylinder lock mechanism 33 includes a bracket 34 integrally supported on the piston rod 26 side and a bracket 34 for engaging and disengaging from the cylinder tube 30 side. Lock pin 35 supported so that it can come and go
An ammunition device 3 that constantly urges the lock pin 35 toward the engagement side.
6. Hand operation lever 39 of handle portion 38 connected to lock pin 35 via connection wire 37, connection wire 3
The outer tube 37a includes an outer receiver 34a for fixing the outer tube 37a. That is, the hand operation lever 39
The left and right traveling wheels 8 regulate the expansion and contraction of the side cylinder 23 in a horizontal state based on the engagement operation of the lock pin 35 by the lock arm 35. However, the balance arm 11 is configured independently of the balance lock mechanism 18. By restricting the expansion and contraction of the side cylinder 23 while allowing the free swing of the balance arm 11, only the above-described driven rolling control based on the free swing of the balance arm 11 can be selectively performed. I have. Since the left and right side cylinders 23 are hydraulically linked as described later, the left and right side cylinders 23 can be simultaneously locked by the locking operation of the cylinder lock mechanism 33 provided on one of the side cylinders 23. It has become.

The engaging portion on the cylinder tube 30 side where the lock pin 35 engages and disengages can form an engaging portion integrally recessed on the outer peripheral portion of the cylinder tube 30 (rod cover). Instead, the strength of the engaging portion can be significantly increased as compared with the case where a separate member is used.

The bracket 34 is disposed along the outer circumference of the cylinder tube 30 and has one end integrally connected to the piston rod 26. The bracket 34 is connected to the other end of the bracket 34. Is a pair of upper and lower leg pieces 34 along the upper surface and the lower surface of the cylinder tube 30.
b is formed, and a pair of left and right roller pins 40 is provided between the two leg pieces 34b along the left side surface and right side surface of the cylinder tube 30. That is, the other end of the bracket 34 is slidably connected to the outer peripheral portion of the cylinder tube 30 in the front-rear direction, so that both ends of the bracket 34 can be supported in a double-supported manner. I have. With the above configuration, both side cylinders are
After checking the level of the aircraft,
By adjusting the screwing amount of
Up and down range without compromising the level of the aircraft
Switching can be performed.

On the other hand, reference numeral 41 denotes a hydraulic valve unit disposed at the center of the machine body.
Is a diverting valve 42 for diverting the supply oil of the pump, and a first tank port T
1st hydraulic valve (directional control valve) interposed in the oil passage to 1
43, a second hydraulic valve 44 interposed in an oil passage from the other output port of the flow dividing valve 42 to the second tank port T2.
And so on.

The first hydraulic valve 43 is a four-port valve operable to switch between three positions (elevation, stop, and descent) based on the operation of the elevating operation lever 45. The cylinder ports C and D of the main cylinder 10 are connected to the ports A and B, respectively. In other words, the first hydraulic valve 43 controls the vertical movement of the main cylinder 10 by the switching operation based on the operation of the lifting / lowering operation lever 45 to perform the lifting / lowering control of the machine body.

On the other hand, the second hydraulic valve 44 is connected to a rolling detection mechanism to be described later, and has three positions (right tilt, stop, left tilt) based on the detection of the rolling detection mechanism.
The output port E of the pair of output ports E and F is a cylinder port on the wheel raising side (extension side) of the left side cylinder 23L. G through a hydraulic pipe 46, while the other output side boat F is connected to the wheel port side (extension side) cylinder port H of the right side cylinder 23R.
Are connected to each other via a hydraulic pipe 47, and the cylinder ports I and J of the wheel lowering side (reducing side) of both side cylinders 23L and 23R are connected to each other via a hydraulic pipe 48. That is, a pair of left and right side cylinders 23L and 23R are hydraulically connected in series to the single second hydraulic valve 44, and in the state of switching to the first position (left tilt), hydraulic pressure is supplied to the cylinder port G. Operate the right side cylinder 23R on the wheel descending side, which is the opposite direction,
In the state of switching to the third position (inclination to the right),
Supply hydraulic pressure to the cylinder port H to supply the right side cylinder 2
3R is actuated to the wheel rising side, while the hydraulic pressure discharged from the cylinder port J of the right side cylinder 23R is supplied to the cylinder port I to actuate the left side cylinder 23L to the wheel descending side which is the opposite direction. I have.

The piston 49 of the side cylinder 23 is formed with a communication hole 49a for communicating the two cylinder chambers partitioned by the piston 49, and a stepped hole is formed at each end of the communication hole 49a. Seat part 4
9b is formed. A pair of poppets 50 for opening and closing the respective sheet portions 49b are provided inside the communication holes 49a.
And an ammunition 51 that constantly urges the bopette 50 toward the closed side, are further provided in the poppets 50.
The contact pins 50a protruding into the cylinder chamber are integrally formed. That is, in a state where the piston 49 is located in the middle of the cylinder tube 30, both poppets 50 are kept closed by receiving the urging force of the elastic machine 51, but when the piston 49 reaches the stroke end, the cylinder chamber is closed. The contact pin 50a contacts the end face of the first poppet 50 and the other poppet 50 is opened.
0 also receives the hydraulic pressure superior to the ammunition 51, and is opened to open both cylinder chambers. Therefore, even when one of the provisional side cylinders 23 reaches the stroke end in advance, the supplied pressure oil can be passed and the operation of the other side cylinders 23 can be continued.

Reference numeral 52 denotes a side float disposed on the left and right sides of the body, and a rear end of the side float 52 is connected to a lower end of the planting work section 6 so as to be vertically swingable. However, the front end of the side float 52 is provided with a support shaft 5 protruding outward from the pivot point of the swing case 7.
3 is vertically connected via a U-shaped link 54 that is rotatable around the axis of the support shaft 53.

Reference numeral 55 denotes a rolling detection rod which constitutes the rolling detection mechanism. The rolling detection rod 55 is disposed along the support shaft 53. The outer end of the rolling detection rod 55 is integrally connected to the link 54, while the outer end of the rolling detection rod 55 is supported by the leading end of the support shaft 53 so as to be able to rotate back and forth. It is integrally connected to the connection arm 56. In other words, both ends of the rolling detection rod 55 are supported on the same axis to prevent the eccentric load from acting on the rolling detection rod 55. Therefore, the rolling detection rod 55 Float 5
2 smoothly follows the up and down movement of the connecting arm 56.
Is surely rotated.

Further, reference numeral 57 denotes a balance rod disposed at the center of the body in the left-right direction. The balance rod 57 is pivotally supported at the center so that it can swing back and forth.
The spool of the second hydraulic valve 44 is interlockingly connected to a position deviated laterally from the pivotal position. Further, the left and right ends of the balance rod 57 are connected to the connection arms 56 via connection rods 58, respectively. Are connected. That is, the balance rod 57 swings based on the reciprocal vertical movement of the left and right side floats 52, and automatically switches the second hydraulic valve 44 based on the push and pull of the spool accompanying the swing. ing.

In the embodiment of the present invention configured as described above, the second connecting rod 2 connected to the swing case 7
The lifting range of the traveling wheel 8 is changed based on the rod length switching of 2.
The switching mechanism is configured by connecting the piston rod 26 of the side cylinder 23 provided on the second connecting rod 22 to the rear rod portion 25 in a threaded manner. . That is, the screw connection portion 27
Is normally stopped by the nut 28, but the nut 2
When the piston 8 is loosened, the screwing amount changes with the turning operation of the piston rod 26, and based on the change in the screwing amount, the ascending / descending range of the traveling wheel 8 is switched up and down . That is, even in the state in which the load on the machine body is still being received, the up / down range can be switched up and down only by turning the piston rod 26. Therefore, it is possible to eliminate the inconvenience of requiring an auxiliary worker to support the machine body and restricting the work place as in the case of switching by replacing the connecting pin, and as a result, the work at the time of switching can be solved. In addition to the improvement of the workability, the switching work in the field can be performed, and the work efficiency can be improved.

Further, according to the embodiment of the present invention, a game that displays a change in the amount of screwing in the screw connection portion 27 is provided.
Since it is provided a di-section, exactly the lifting range of the running wheels 8
It is possible to switch up and down, thereby contributing to improvement of traveling performance and work accuracy.

Further, at the tip of the gauge bar 29,
Since the stopper 29c for restricting the piston rod from coming out when the piston rod is fully extended is provided, the piston rod 26
Can be prevented from being unnecessarily turned to operate and dropping from the rear rod portion 25.

Further, in the present embodiment, the threaded connecting portion 32 is also provided between the cylinder tube 30 and the front rod portion 24.
Is provided, it is possible to perform horizontal adjustment of the left and right traveling wheels 8 when the cylinder is locked. However, since the turning operation of the cylinder tube 30 is allowed only in a state where the piping is not connected, the factory It is possible to prevent inconveniences such as misalignment due to a user's incorrect operation after shipment and dropping of the cylinder tube 30 from the front rod portion 24.

[0027]

[Effects] In summary, the present invention uses left and right running wheels.
Equipped with a pair of left and right side cylinders that can be raised and lowered respectively
In the walking type working machine,
Ton rod and cylinder tube
Cylinder lock mechanism to restrict expansion and contraction of
The cylinder lock mechanism and the piston rod
Travels between the connected members based on the change in the amount of screwing
If a screw connection is provided to switch the range of lifting and lowering the wheels up and down
Together, they form a gauge part that indicates the change in screwing of the screw connection part.
Because characterized in that the form has, as in the prior art for switching the lifting range by replacement of consolidation pins, without or especially support body during switching operations, remains underwent body weight As a result, it is possible to switch the lifting range, and as a result, it is not possible to improve the workability at the time of switching by eliminating the need for an auxiliary worker, and it is also possible to perform the switching work in the field and improve the work efficiency. it can. Also both sides
After locking the cylinder, check the level of the
Stepless adjustment by adjusting the threading amount of the ston rod
Even if the adjustment mechanism is
Up / down switching of the descending range can be performed. In addition, a change in the amount of screwing in the screw connection portion is displayed on a gauge, and the range of elevation of the traveling wheel can be accurately switched, which contributes to improvement in traveling performance and work accuracy.

[Brief description of the drawings]

FIG. 1 is a side view of a rice transplanter.

FIG. 2 is a plan view of the same.

FIG. 3 is a side view of a main part of the same.

FIG. 4 is a plan view of a main part of the same.

FIG. 5 is a cross-sectional view of the intermediate link mechanism.

FIG. 6 is a plan view of a main part of a second connecting rod.

FIG. 7 is a rear view of the same.

FIG. 8 is a cross-sectional view of a side cylinder in which a cylinder is located at an intermediate position.

FIG. 9 is a sectional view of the side cylinder reaching a stroke end.

FIG. 10 is an enlarged sectional view of a main part of a piston.

FIG. 11 is a hydraulic circuit diagram showing an operation circuit of a main cylinder and a side cylinder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Running body 7 Swing case 8 Running wheel 22 Second connecting rod 23 Side cylinder 27 Screw connection part

──────────────────────────────────────────────────続 き Continuing from the front page Examiner Hidehiko Nishida (56) References JP-A-64-30506 (JP, A) JP-A-59-81305 (JP, U) JP 4-31643 (JP, B2) ( 58) Field surveyed (Int.Cl. ⁶ , DB name) A01C 11/02 A01B 63/10

Claims (1)

(57) [Scope of request for utility model registration] 1. A right and left running wheels each elevator is to the right and left pair of consisting includes a side cylinder walk-behind working machine, the piston rod of the side cylinder and the cylinder
Restrict the sliding of the tube and restrict the expansion and contraction of the side cylinder.
A cylinder lock mechanism for controlling the cylinder lock.
Vertical and mechanism, between members the piston rod is connected, the elevation range of the running wheels on the basis of changes in Nishikomi amount
Nishikomi connecting portion provided with a lifting range switching structure of the running wheel in the walk-behind working machine, characterized in that the formation of the gauge section for displaying the Nishikomi change in該螺write connecting portion for switching to.