JPH08116703A - Apron-spring up device in rotary working machine - Google Patents

Abstract

PURPOSE: To provide an apron-spring up device attached at a rear part of a tractor through a three-point linkage in a liftable manner and capable of performing easy switching between the spring-up mechanism for an apron and the releasing of the mechanism. CONSTITUTION: This apron-spring up device comprises a hook 22 pivoted to the main body 10 of a working machine swingably in vertical direction and a guiding member 20 placed on an apron 12 in an attachable and detachable manner to the hook 22. When the apron is swung upward by a specified angle without changing a supporting point of a compression rod 14, the guiding member touches the hook and swings it. Thus, the guiding member is automatically engaged with the hook. When the apron is further swung upward from the engaged state by a specified angle, the hook swings and is locked at a specified position, and at the same time, the engagement of the hook with the guiding member is automatically released.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apron hoisting device for a rotary working machine, such as a rotary tilling / crushing device or a rotary scraping device, which is mounted on a rear portion of a tractor so as to be able to move up and down. Regarding

[0002]

2. Description of the Related Art Conventionally, an apron is pivotally mounted on the rear end of a shield cover which is mounted on the rear part of a tractor via a three-point link mechanism so as to be able to move up and down. However, a compression rod and an apron locking device that locks the apron in its flipped-up state when the apron is flipped up by a predetermined angle and can release the locked state are provided between the working machine body and the apron. Another rotary working machine is known, for example, from Japanese Patent Laid-Open No. 2-249404. When replacing the work claws of the work rotor, when the rotary working machine crosses the ridge, or when working on the shore, it is necessary to lock the apron in a state of being flipped up by a predetermined angle. At this time, in the rotary working machine of this prior art, the apron is flipped up by a predetermined angle and locked in the flipped up state, and when the lock is released, an operation of changing the fulcrum position of the compression rod is performed,
The switching lever of the apron locking device is also switched.

[0003]

By the way, in the above-mentioned conventional rotary working machine, when the apron is flipped up by a predetermined angle and locked in the flipped up state, the locking is released.
While the operator holds the apron in a state of being lifted by a predetermined angle by hand, the fulcrum position of the compression rod is switched by the switching lever, and the switching lever of the locking part of the apron locking device is switched to flip the apron up by a predetermined angle. Since the operation of locking the state or releasing the locked state is performed at the same time, there is a problem that the operation is troublesome and requires a large amount of force and labor. The present invention has been made for the purpose of solving the above problems.

[0004]

In order to achieve the above object, the present invention provides a rear portion of a shield cover which is mounted on a rear portion of a tractor via a three-point link mechanism so as to be able to move up and down. The upper end of the apron is rotatably pivotally attached to the end of the apron, and when the compression rod and the apron are flipped up by a predetermined angle between the working machine body and the apron, the apron is locked in the flipped up state. In a rotary working machine provided with an apron locking device capable of releasing a stopped state, the apron locking device includes a hook member pivotally attached to a working machine body side in a vertically rotatable manner, and the hook member. And a guide member provided on the apron side so as to be engageable with and disengageable from each other, and when the apron is turned upward by a predetermined angle without changing the fulcrum of the compression rod, the guide member causes When the guide member is brought into contact with the hook member and the hook member is rotated, the guide member is automatically engaged with the hook member, and when the apron is rotated further upward by a predetermined angle from the engaged state, the hook member is rotated. The hook member and the guide member are automatically disengaged from each other while being locked at a predetermined position.

[0005]

With the above-described structure, the apron flip-up device for a rotary working machine according to the present invention has only to lift the apron upward by a predetermined angle when the apron is rotated upward by a predetermined angle and locked in the flip-up state. The guide member of the apron is automatically engaged and locked with the hook member of the working machine body. To release the flip-up locked state of the apron, hold the apron in the flip-up locked state and rotate it further upward by a predetermined angle to rotate the hook member and lock it in the predetermined position. The engagement between the hook member and the guide member is automatically released, and the apron can be lowered. The locked hook member returns to the position where the guide member can be automatically engaged with the hook member by releasing the lock.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to the accompanying drawings. In FIG. 4, reference numeral 1 is a rotary working machine having a long length in the left-right direction and having a function of crushing and scraping. An automatic hitch coupler 4 is provided which is connected to a known three-point link mechanism including a top link and a lower link and is automatically connected to the top mast 2 and a pair of left and right lower connecting portions 3. The rotary working machine 1 is mounted on the rear part of the tractor so as to be able to move up and down. In addition, the rotary working machine 1
The power is transmitted from the PTO shaft of the tractor to the input shaft 6 protruding forward from the gear box provided at the front portion of the rotary working machine 1 via the transmission body 5. The lower connecting portions 3 and 3 are adjusted up and down respectively to work loci to be described later.
A gauge wheel 7 that can adjust the working depth of the tool is attached.

The power input to the input shaft 6 is changed in speed in a gear box and transmitted to a transmission case 8 provided on the side of the machine body. Power is transmitted to and driven. The upper part of the work rotor 9 is covered with a shield cover 11 supported by the work machine body 10. The upper end of the apron 12 is attached to the rear end of the shield cover 11 by the shaft 1.
It is pivotally attached via 3. Working machine body 10
Between the apron 12 and the compression rod 14
Is interposed. This compression rod 14
The lower end portion is pivotally attached to a bracket 15 protruding from the upper surface of the apron 12, and the upper end portion is attached to a supporting arm 16 protruding obliquely rearward from the working machine body 10 to the rotary support piece 1.
It is slidably supported via 7. The spring pressure of the spring 18 wound around the compression rod 14 can be adjusted by moving the spring support seat 19.

As shown in an enlarged view in FIGS. 1 to 3, a guide member 20 is provided on the upper surface of the apron 12 so as to project, and an engaging portion 21 is formed at the tip thereof. The hook member 22 having the engagement groove 23 that engages / disengages with the engagement portion 21 is
A pin 25 is pivotally mounted between a pair of support frames 24, which are erected on the rear portion of the working machine body 10, so as to be vertically rotatable. The hook member 22 is normally urged by a tension spring 26 stretched between the hook member 22 and the support frame 24 so that the lower surface thereof abuts the upper surface of the working machine body 10.

Also, when the hook member 22 is rotated upward to a predetermined angle position on one side surface of the support frame 24,
A locking pin 27 that engages with an engagement hole 22 a formed in the hook member 22 and prevents the hook member 22 from rotating is provided. The locking pin 27 is supported by a support frame 28 with a spring 29 interposed therebetween so as to move in the left-right direction and to be biased toward the hook member 22 side. Then, the guide member 20 provided with the engaging portion 21, the hook member 22 having the engaging groove 23,
An apron locking device is configured by the locking pin 27 and the like. Reference numeral 30 is a side leveler provided so as to be able to be erected on the left and right sides of the lower end of the apron 12.

In the rotary working machine 1 having such a structure, the tractor has a 3
Connected via a point link mechanism, as shown in FIG.
Lower the apron 12 and compress the compression rod 14
Perform the work in the state in which is activated.

When the work claws of the work rotor 9 are replaced, when the rotary working machine crosses the ridge, or when working on the shore, the apron 12 is lifted up by a predetermined angle. Stop. At this time, the apron 12 is rotated upward from the normal working state shown in FIG. 4 to be locked at a predetermined position as shown by a virtual line in FIG. At this time,
First, the spring support seat 19 of the compression rod 14 is lowered downward as shown by an imaginary line so as to release the spring pressure of the spring 18, and then the apron 12 is flipped up to a predetermined angle in the arrow direction. 20 engaging portions 21
Comes into contact with the curved outer peripheral surface of the hook member 22 and rotates the hook member 22 slightly upward about the pin 25 against the elastic force of the tension spring 26 so that the engaging portion 21 engages. When entering the groove 23, the elastic force of the tension spring 26 causes the hook member 22 to return to its original position, and the engaging portion 21
Are automatically engaged, and the apron 12 is locked in a flip-up state indicated by a virtual line. At this time, the compression rod 14 slides forward in the rotation support piece 17 while rotating the rotation support piece 17 at its tip end side, and moves without changing the fulcrum (position of the rotation support piece 17).

When releasing the locked state of the apron 12 locked at the position rotated upward as described above, the apron 12 is further moved from the locked state (state of phantom line in FIG. 1). When the hook member 22 is rotated upward by a predetermined angle, the hook member 22 is slightly rotated upward about the pin 25 via the engaging portion 21 of the guide member 20, and the engaging hole formed in the hook member 22 is formed. When 22a and the tip of the locking pin 27 are aligned, the locking pin 27 is inserted into the engaging hole 22a by the urging force of the spring 29, and the hook member 22 is prevented from rotating as shown by the solid line in FIG. And lock it. When the hook member 22 is locked, the engagement between the engagement portion 21 of the guide member 20 and the engagement groove 23 of the hook member 22 is automatically released. That is, the apron 12 is returned to the use state by its own weight as shown by the solid line in FIG. Then, the spring support seat 19 of the compression rod 14 is returned to the original position and the spring 18 is put into the working state, and the normal work can be performed.

The hook member 22 locked by the locking pin 27 is pulled out from the engaging hole 22a by pulling the locking pin 27 against the urging force of the spring 29, and the lock is released. It rotates downward by its own weight and returns to a position where it can be automatically engaged with the hook member guide member 22.

[0014]

As described above, according to the apron hoisting device for a rotary working machine of the present invention, the apron locking device includes a hook member pivotally attached to the working machine body side in a vertically rotatable manner. The hook member and a guide member provided on the apron side so as to be engageable with and disengageable from each other, and when the apron is rotated upward by a predetermined angle without changing the fulcrum of the compression rod, the guide member causes the hook to move. When the hook member is rotated by contacting the member, the guide member is automatically engaged with the hook member, and when the apron is rotated further upward by a predetermined angle from the engaged state, the hook member is rotated. Since it is configured to be locked in place and automatically disengage the hook member from the guide member, the apron is turned upward by a predetermined angle to the flip-up state. When stopped, by lifting towards the apron at a predetermined angle upward, apron guide member is automatically engaged with the hook member of the machine body, it can be locked. Further, when the flip-up locked state of the apron is released, the hook member is rotated and locked at a predetermined position by rotating the apron in the flip-up locked state further upward by a predetermined angle, and at the same time, the hook member is locked. The engagement between the guide member and the guide member is automatically released, and the apron can be lowered. Then, the locked hook member returns to the position where the guide member can be automatically engaged with the hook member by releasing the lock.

[Brief description of drawings]

FIG. 1 is a side view of an apron flip-up device according to the present invention.

FIG. 2 is an explanatory diagram of the same operation.

FIG. 3 is a view showing a hook member as viewed from the direction of arrow A in FIG. 1.

FIG. 4 is a side view of the entire rotary working machine including the apron flip-up device of the present invention.

[Explanation of symbols]

 1 Rotary Working Machine 2 Top Mast 3 Lower Connecting Section 4 Auto Hitch Coupler 5 Transmission Shaft 5 6 Input Shaft 7 Gauge Wheel 8 Transmission Case 9 Working Rotor 10 Working Machine Body 11 Shield Cover 12 Apron 13 Shaft 14 Compression Rod 15 Bracket 16 Support arm 17 Rotating support piece 18 Spring 19 Spring support seat 20 Guide member 21 Engagement portion 22 Hook member 22a Engagement hole 23 Engagement groove 24 Support frame 25 Pin 26 Pulling spring 27 Locking pin 28 Support frame 29 Spring 30 Side leveler

Claims (1)

[Claims] 1. An upper end of an apron is rotatably pivotally attached to a rear end of a shield cover which is attached to the rear of the tractor via a three-point link mechanism so as to be able to move up and down. A rotary provided with a compression rod and an apron locking device that locks the apron in its flipped-up state when the apron is flipped up by a predetermined angle and can release the locked state between the work machine body and the apron. In the working machine, the apron locking device includes a hook member pivotally attached to the working machine body in a vertically rotatable manner, and a guide member provided on the apron side so as to be engageable with and disengageable from the hook member. When the apron is rotated upward by a predetermined angle without changing the fulcrum of the compression rod, the guide member comes into contact with the hook member to rotate the hook member. When the hook member is automatically engaged and the apron is further rotated upward by a predetermined angle from the engaged state, the hook member is rotated and locked at a predetermined position, and the hook member and the guide member are separated from each other. An apron flip-up device for a rotary working machine, characterized in that the engagement is automatically released.