JP3261318B2 - Locking and unlocking mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for locking / unlocking a leveling plate which is pivotally attached to a rear portion of an apron of a rotary working machine between a leveling state and a leveling state.

[0002]

2. Description of the Related Art Conventionally, a front portion of an apron is pivotally attached to a rear portion of a shield cover which is mounted on a rear portion of a tractor via a connecting device so as to be able to ascend and descend, and is fixed so as to cover above a working rotor. 2. Description of the Related Art There has been known a rotary working machine in which a front portion of a soil leveling plate is pivotally attached to a rear portion of an apron, and the soil leveling plate can be switched between a soil level state locked by an operation mechanism and a leveled state unlocked by an operation mechanism. ing.

In the operating mechanism, the operation lever is operated to lock the crushing leveling plate in the crushing state, and then, when the lock is released and the crushing leveling plate is set to the leveling state, the rotary is used. Raise the work machine to separate the soil leveling plate from the field scene, operate the operation lever to release the lock, then lower the rotary work machine to ground the tip of the soil leveling plate to the field scene, As a result, it was necessary to slightly advance the rotary working machine to make it even.

[0004]

As described above, it is troublesome to lock the crushing flat plate in the crushed state and then release the lock to make the crushing flat plate in the flattened state. In addition, there is a problem that it takes time for the operation. The present invention has been made to solve the above problems.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a shield mounted on a rear portion of a tractor so as to be able to ascend and descend through a connecting device and fixed above a work rotor. Pivot the front of the apron to the back of the cover,
A rotary working machine that pivotally attaches a front portion of a soil leveling plate to a rear portion of the apron and switches the soil leveling plate between a soiled state locked by an operation mechanism and an unlocked leveled state, The above-mentioned operation mechanism is pivotally supported on the upper end of a rod whose lower end is pivotally supported on the top surface of the flat plate, the support arm having the base end pivotally supported on the main body frame, and the upper end of the main body frame. A link arm that is connected to the operation lever and moves up and down by rotating the operation lever; and a lock and lock that is pivotally supported by the body frame and is connected to the link arm and rotates within a predetermined range by the up and down movement of the link arm. A release plate, and a lock hole formed in the plate and engaged / disengaged with a lock pin provided on the support arm by rotation of the plate. It is set to.

[0006]

With the above construction, the lock / unlock mechanism of the bunching leveling plate of the present invention is used when the operating mechanism switches the bunching leveling plate from the burrowing state to the burling leveling state or from the leveling state to the burrowing state. When the rotary work machine is lifted and the soil leveling plate is lifted from the field scene, the soil leveling plate can be freely switched between the two states while riding on the tractor, and the operation can be performed simply and in a short time.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described.
This will be specifically described with reference to the accompanying drawings.

In FIG. 3, reference numeral 1 denotes a rotary scraper (working machine) having a predetermined length in the left-right direction, and a well-known top link and lower provided at the front of the tractor at the front thereof. The tractor connecting portions 2 and 3 that are connected to be able to move up and down are provided in a three-point link mechanism including a link. The rotary scraper 1 is almost automatically attached to and detached from the tractor, and is provided from the PTO shaft of the tractor via a universal joint, a transmission shaft, and the like, at a front central portion of the main body frame 4 also serving as a transmission frame. Power is transmitted to the transmission gearbox via the input shaft.

The main body frame 4 extends to the left and right from the gear box, and a transmission case 5 also serving as a side plate is fixedly provided at one end thereof, and a support frame (not shown) also serving as a side plate is opposed to the transmission case 5 at the other end. It is fixed. Between the transmission case 5 and the lower end of the support frame,
A well-known work rotor 6 having a crushing and scraping function is mounted on a shaft. The upper part of the work rotor 6 is covered by a shield cover 7 supported by the main body frame 4, and a rear end of the shield cover 7 is provided with an apron 8 pivotally mounted with a flat plate 9 at the rear end. The upper end is pivotally attached via a pivot 10 so as to be rotatable in the vertical direction. The apron 8 is pivotally supported via a center pivot 11 so as to be rotatable in the left-right direction.

When the rotary scraper 1 is attached to or detached from the tractor, a stand 12 is used to keep its posture constant.
Is provided. The stand 12 has a connecting portion 13
The fixing pin 15 is attached to the holder 14 provided on the transmission case 5 so that the fixing pin 15 can be attached and detached and the fixing pin 15 can be rotated up and down 180 degrees around the fixing pin 15. Then, the stand 12 is fixed to the use position or the non-use position by inserting the locking pin 16 into the lower portion or the upper portion of the connecting portion 13 and the holder 14. Casters may be attached to the stand 12.

As shown in FIGS. 1 and 2, the soil leveling plate 9 is pivotally attached to the rear end of the apron 8 via a pivot shaft 17, and is directed downward by an operation mechanism described later. Rotated and locked soiling state (virtual line state in the drawing)
And the leveled state with this lock released (solid line state in the drawing)
And can be switched.

The operation mechanism of the mulling leveling plate 9 includes a bracket 18 provided on the upper surface at the central position in the longitudinal direction of the mulling leveling plate 9.
The upper end of the rod 19 whose lower end is pivotally supported at the tip,
A support arm 20 having a base end pivotally supported by the main body frame 4;
A link arm 22, which is connected to an operation lever 21 pivotally supported on the upper part of the main body frame 4 so as to rotate in the front-rear direction, moves up and down by the rotation operation of the operation lever 21, and protrudes rearward from the main body frame 4. Left and right support plates 23, 23
A lock / unlock plate 25 which is pivotally supported via a shaft 24 and is connected to the link arm 22 and rotates within a predetermined range around the shaft 24 by the vertical movement of the link arm 22; Formed on the plate 2
The lock arm 26 is provided with a lock pin 26 provided on the support arm 20 by the rotation of the lock arm 5 and a lock hole 27 for engaging and disengaging.

When the lock / unlock plate 25 is rotated to the unlocking side continuously with the lock hole 27, the lock / unlock plate 25 slides in contact with the lock pin 26 in a cam-like manner. 20, rod 1
A convex portion 28 is formed which pushes the soil flattening plate 9 to a flattened state through the intermediary 9. The support plate 23 has a lock
A stop pin 29 is provided for restricting further rotation in a state where the lock release plate 25 is rotated and the soil flat plate 9 is pushed up by the convex portion 28 to a flat state.

When the leveling plate 9 is switched from the leveling state to the leveling state or from the leveling state to the leveling state, the rotary scraper 1 is moved at least by the three-point link mechanism with the operation stopped. The leveling plate 9 is lifted until it is separated from the field scene. In this state, for example, the operation lever 21 is pulled (falled) to the position indicated by the solid line in the drawing.
Then, the lock / unlock plate 25 is rotated to the solid line position via the link arm 22 and the projection 28 is
6, the supporting arm 20 and the rod 19 while sliding in a cam shape.
The soil flat plate 9 is pushed up to the leveled state via. At this time, the rotation of the lock / unlock plate 25 is restricted by contacting the stop pin 29.

In order to switch the leveling plate 9 from the leveling state to the leveling state, the operating lever 21 is pushed (falled) to a position indicated by a virtual line in the drawing with the rotary scraper 1 raised. The lock / unlock plate 25 pivots to the imaginary line position via 22, and in the process, the soil leveling plate 9 pivots downward about the pivot shaft 17 by its own weight and locks into the lock hole 27. The pin 26 is engaged and locked, and the mulling flat plate 9 is fixed in the mulling state. In this state, lower the rotary scraper 1 to
The burying work is performed by the burying plate 9.

In the rotary scraping machine 1 having such a configuration, when performing crushing and scraping work, the work is mounted on a tractor via a three-point link mechanism and introduced into a paddy field to perform the work. The rotary scraper 1 receives power from the tractor, is shifted by a gear box, is transmitted from the main body frame 4 to the transmission case 5, and drives the work rotor 6 to perform crushing and scraping work. The soil crushed and scraped by the work rotor 6 is
Work row guided by shield cover 7 and apron 8
And is leveled by an apron 8 and an earthen leveling plate 9.

The stand 12 is used when mounting the rotary scraper 1 on a tractor, removing it from the tractor, carrying it on a carrier bed, carrying it in a warehouse, and the like. When the stand 12 is supported in the use state, the fixing pin 18 of the connecting portion 13 may be inserted into the support hole from the notch of the notched support hole of the holder 14 and the locking pin 16 may be inserted. When removing the stand 12 from the rotary scraper 1, it is possible to easily remove the stand by simply removing the locking pin 16 and removing the fixing pin 16 of the connecting portion 13 from the support hole through the notch. When the stand 12 is rotated upward by 180 degrees from the use position and held in the non-use position, the locking pin 16 is pulled out, and the stand 12 is rotated by 180 degrees about the fixing pin 15 so that the locking pin 16 Just insert it.

When the crushing and scraping work is performed by the rotary scraper 1, initially, the apron 8 and the soil leveling plate 9 are vertically and horizontally moved through the pivot shaft 10 and the center pivot 11 by their own weights. Perform leveling work while rotating. At this time, the soil leveling plate 9 is in the position indicated by the solid line in the drawing, and is freely rotated up and down around the pivot shaft 17 to perform the leveling operation.
Is restricted at a position in contact with the convex portion 28, and does not rotate downward more than necessary.

When the rotary scraping machine 1 advances the scraping operation and leveles the entire surface of the scratch, for example, when moving the soil in the high part of the ridge to the lower side, the leveling is performed. The operation is interrupted, the rotary scraper 1 is lifted, and the soil leveling plate 9 is switched to the soil-eroding state by the operation lever 21 and fixed, and the earth-eroding operation is performed.

[0020]

As described above, according to the locking / unlocking mechanism of the flat plate of the present invention, the operating mechanism is
The upper end of the rod, the lower end of which is pivotally supported on the top surface of the flat plate, is pivotally supported at the tip, and the base end is connected to the support arm pivotally supported by the main body frame, and the operation lever pivotally supported by the upper part of the main body frame. A link arm that moves up and down by a rotation operation of an operation lever, a lock / lock release plate that is pivotally supported by the body frame and is connected to the link arm, and rotates within a predetermined range by the up and down movement of the link arm; A lock hole formed in the plate, for engaging and disengaging a lock pin provided on the support arm by rotation of the plate;
In the state where the rotary work machine is lifted and the soil leveling plate is lifted from the field scene, the soil leveling plate is shifted from the soil leveling state to the soil leveling state, or the leveling state is shifted from the leveling state to the tractor. You can switch freely while riding. Further, the operation is simple and simple, and the switching operation can be performed reliably in a short time.

[Brief description of the drawings]

FIG. 1 is a partially sectional side view of a rotary scraper (working machine) to which the present invention is applied.

FIG. 2 is a partial side view of the rotary substitute scraper (working machine).

FIG. 3 is an overall side view of the rotary substitute scraper (working machine).

[Description of Signs] 1 Rotary scraper (rotary work machine) 2, 3 Tractor connection part 4 Main body frame 5 Transmission case (side plate) 6 Work rotor 7 Shield cover 8 Apron 9 Equalizing flat plate 10 Pivot shaft 11 Center Pivot 12 Stand 13 Stand connection part 14 Holder 15 Fixing pin 16 Locking pin 17 Pivot shaft 18 Bracket 19 Rod 20 Support arm 21 Operation lever 22 Link arm 23 Support plate 24 Axis 25 Lock / unlock plate 26 Lock pin 27 Lock hole 28 Convex part 29 Stop pin

Claims (1)

(57) [Claims] 1. A front part of an apron is pivotally mounted on a rear part of a shield cover which is mounted on a rear part of a tractor via a connecting device so as to be able to ascend and descend, and is fixed so as to cover above a working rotor.
A rotary working machine that pivotally connects a front portion of a soil leveling plate to a rear portion of the apron and that can switch between the soil leveling state locked by an operation mechanism and a leveled state unlocked by an operating mechanism, The above-mentioned operation mechanism is pivotally supported on the upper end of a rod whose lower end is pivotally supported on the top surface of the flat plate, the support arm having the base end pivotally supported on the main body frame, and the upper end of the main body frame. A link arm that is connected to the operation lever and moves up and down by rotating the operation lever; and a lock and lock that is pivotally supported by the body frame and is connected to the link arm and rotates within a predetermined range by the up and down movement of the link arm. A release plate, and a lock hole formed in the plate and engaged / disengaged with a lock pin provided on the support arm by rotation of the plate. Locking and unlocking mechanism of the flat plate.