JP3426536B2 - Automatic opening and closing device for folding 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 working machine portion in which a central portion in the longitudinal direction is mounted on a rear portion of a tractor via a three-point link hitch mechanism so that the central portion can be moved up and down and extends to the left and right sides of the central portion. The present invention relates to an automatic opening / closing device for a folding working machine in which each of them can be folded toward the central portion and the folding and unfolding operations are automatically performed.

[0002]

2. Description of the Related Art Conventionally, a longitudinal center portion of a farm work machine is mounted on a rear portion of a tractor via a three-point link hitch mechanism so as to be vertically movable, and power is transmitted from the tractor to the center portion of the farm work machine. There is known an agricultural working machine in which the working machine parts extending from the central part to the left and right sides of the central part are respectively folded toward the central part in order to shorten the lateral length of the machine body and can be deployed. .

As a method of folding the left and right working machine parts with respect to the central part, A spring with a large compressive force is interposed between the left and right working machine parts and the central part, and the working machine part is manually opened and closed between the folded position and the deployed position. ． A cylinder mechanism is used to open and close the left and right working machine parts to the folding and unfolding positions. Means such as are known.

[0004]

[Problems to be Solved by the Invention] In Case of,
When opening and closing the working machine part between the folding position and the unfolding position, the operator has to get off the tractor and perform the opening and closing work. ． In the case of, the cylinder mechanism is required, the weight becomes heavy, and the cost becomes high. There was a problem such as.

According to the present invention, the agricultural working machine is divided into a central portion and left and right working equipment portions, and the left and right end portions of the central portion and the inner end portions of the left and right working equipment portions are substantially divided by rotation fulcrums. Agricultural work machine that is rotatably connected to the 90 ° diagonal rear is automatically opened and closed by balancing the weight change to the rotation fulcrum of the left and right work machine parts by lifting and lowering the agricultural work machine and the spring elastic force. By doing so, the worker can automatically open and close the working machine part only by unlocking the folding position and the unfolding position of the working machine part, and it is an object of the present invention to solve the above conventional problems. It was done by.

[0006]

In order to achieve the above object, the present invention provides: A lengthwise central portion of the agricultural working machine is attached to a rear portion of the tractor via a three-point link hitch mechanism so as to be able to move up and down, and power is transmitted from the tractor to the central portion of the agricultural working machine, and the central portion is attached to the central portion. In the agricultural working machine that is formed by folding the working machine parts extending from the left and right sides to the central part side, the agricultural working machine is divided into a central part and left and right working machine parts. Left and right ends of the work machine and inner ends of the left and right work machine parts are rotatably connected to each other by a rotation fulcrum so as to be inclined obliquely backward by about 90 °, and a compression direction spring is arranged on the front side orthogonal to the rotation fulcrum. At the same time, the feature is that the work machine part is automatically opened and closed by the balance between the weight change to the rotation fulcrum of the left and right work machine parts due to the lifting and lowering of the agricultural work machine and the spring elastic force. That

B. A lock device for automatically locking the working machine portion at the folding position and the expanding position is provided, and when the working machine portion is rotated from the folding position to the developing position,
The 3-point link hitch mechanism lowers the farm work machine to release the lock, and when the weight load on the rotary fulcrum of the work machine section becomes larger than the elastic force of the spring in the process of slowly raising the farm work machine, the work machine section When the working machine part is automatically rotated and locked at the deployed position and the working machine part is rotated from the deployed position to the folding position, the agricultural work machine is lifted and unlocked by the three-point link hitch mechanism to lock the agricultural work machine. When the weight load on the rotation fulcrum of the work implement becomes smaller than the elastic force of the spring during the slow descending process, the work implement is automatically rotated to the folding position and locked. Is characterized by.

[0008]

With the above means, the automatic opening / closing device of the folding working machine according to the present invention has the following functions. ． The above A. With this configuration, the operator is light without using the tractor and without using a cylinder mechanism or the like, and automatically opens and closes the working machine portion from the folded position to the deployed position and from the deployed position to the folded position.

[0009]. The above B. With this configuration, the operator can unlock the folding or unfolding position of the working machine and lift the working machine without going down the tractor.The working machine can be moved from the folding position to the unfolding position and from the unfolding position. It automatically opens and closes to the folding position.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be specifically described below with reference to the accompanying drawings. 1 to 3, reference numeral 1 is a substitute harrow having a long length in the left-right direction and having a function of crushing and scraping. Although not shown, the front part of the substitute harrow 1 is connected to a tractor, which is connected to a well-known three-point link hitch mechanism (see FIGS. 4 and 5) including a top link and a lower link of the tractor. 2 is provided, and the substitute harrow 1 is mounted on the rear part of the tractor so as to be able to move up and down. Further, power is transmitted from the PTO shaft of the tractor to the transmission gear box 3 provided in the central portion on the front side of the substitute harrow 1 via the universal joint, the transmission shaft, etc., via the input shaft 3a.

The substituting halo 1 is divided into a central portion 4 and left and right working machine portions 5L and 5R, and the left and right ends of the central portion 4 and the inner end portions of the left and right working machine portions 5L and 5R are divided into three parts. Rotation shafts (rotational fulcrums) 6 and 6 are rotatably connected to each other so as to be obliquely inclined backward by about 90 °, and the left and right working machine portions 5L and 5R can be folded with respect to the central portion 4. Since the working machine parts 5L and 5R are symmetrical and have the same configuration, one working machine part 5L will be described.

On the left and right sides of the gear box 3, there are provided transmission frames 8 which also serve as a main body frame and in which a transmission shaft 7 is housed. Located from the transmission frame 8 behind the tire of the tractor in the central portion 4,
Further, the chain transmission cases 9 are vertically provided at the outer ends of the working machine portions 5L and 5R. A support frame 1 vertically extending from the lower end of each chain transmission case 9 and the transmission frame 8 so as to face the chain transmission case 9.
The rotary shaft 11 is mounted between the lower end portion of 0 and the lower end portion.
A large number of crushed soil / scraping claws 12 are attached to the circumference of the rotary shaft 11 to form a crushed soil / scraping rotor 13.

A dog clutch 14 is provided at a portion where the shaft ends of the transmission shafts 7 and 7 face each other. When the entire scraping harrow 1 is in a working state, the dog clutch 14 is connected to the left and right working machine parts. The dog clutch 14 is disengaged when the 5L and 5R are rotated about the rotary shaft 6 and folded to the central portion 4 side. Above the crushed soil / scraping rotor 13,
The shield cover 15 supported by the main body frame covers the shield cover 15, and an upper end of an apron 16 having a leveler 17 pivotally supported at a rear end of the shield cover 15 is pivotally mounted in a vertically rotatable manner. Has been done. The folding facing portions of the leveler 17 are connected by a hinge 17a that rotates about an axis substantially equal to the axis of the rotary shaft 6. Further, the leveler 17 can be displaced between a leveling position for leveling the soil and a leveling position for scraping the soil.

Gas springs 18 containing high-pressure gas, which are springs in the compression direction, are provided on the front side orthogonal to the rotation fulcrum 6 and on both sides of the rotation fulcrum 6. The number of the gas spring 18 may be one, and in the process of raising and lowering the substitute harrow 1 by the three-point link hitch mechanism, the weight change to the rotation fulcrum 6 of the left and right working machine parts 5L and 5R and the elastic force of the spring 18 are caused. The spring pressure is set to automatically open and close the working machine parts 5L and 5R depending on the balance.

In the folding and rotating portion of the working machine portion 5L,
A lock pin supporting plate having a lock pin is fixedly mounted on the transmission frame 8, and a hook is pivotally supported by a shaft on the central portion 4 side on the inner side (rear side) of the rotation fulcrum 6 in correspondence with the lock pin. , This hook is formed with a hook hole that fits into and disengages from the lock pin, and is biased in a direction to engage with the lock pin, and when the working machine portion 5L is folded, the lock pin automatically moves into the hook hole. A locking device 19 that engages with and locks is provided. The hook is provided with a lock release lever 20 for releasing the lock of the lock device 19.

In the substitute harrow 1 having such a structure, it is supported by a stand 21 having wheels and is stored as it is or is attached to and detached from a tractor. This stand 21 is detached at the time of work. Reference numeral 22 is an extension leveler operation device for performing an operation to put the extension leveler 17b into a working state or a non-working state from the cockpit of the tractor. Further, the lock release lever 20 can be easily operated by a worker who rides on the tractor when the skid harrow 1 is raised by the three-point link hitch mechanism, and when the skid harrow 1 is lowered, the lock release lever 20 rides on the tractor. You may make it connect a wire etc. so that an operator can operate.

When the working machine parts 5L and 5R are rotated from the folding position to the deployed position, the three-point link hitch mechanism lowers the substitute scratch halo 1 and the lock release lever 20 releases the lock. When the weight load on the rotation fulcrum 6 of the working machine parts 5L and 5R becomes larger than the elastic force of the spring 18 in the process of slowly raising the scraping harrow 1, the working machine part automatically rotates to the deployed position. It is locked by the lock device 19.

When the working machine parts 5L and 5R are rotated from the deployed position to the folded position, the three-point link hitch mechanism lifts the substitute scratch halo 1 to release the lock,
Spring 1 in the process of slowly lowering the harrow 1
When the weight load of the working machine parts 5L and 5R on the rotation fulcrum 6 of the working machine parts 5L and 5R becomes smaller than the elastic force of 8,
The working machine parts 5L and 5R are automatically rotated to the folding position and locked by the lock device 19.

[0019]

As described above, according to the automatic opening / closing device of the folding working machine of the present invention, the following effects can be obtained with the above-mentioned configuration.

The agricultural work machine is divided into a central portion and left and right work equipment portions, and the left and right end portions of the central portion and the inner end portions of the left and right work equipment portions are respectively slanted at an angle of about 90 ° by a rotation fulcrum. Rotatably connected to each other, and a spring in the compression direction is arranged on the front side orthogonal to the rotation fulcrum, and the weight change to the rotation fulcrum of the left and right working machine parts due to the lifting and lowering of the agricultural work machine and the spring holding force of the spring Since the work machine part is automatically opened and closed by the balance, the operator can automatically open and close the work machine part from the folded position to the deployed position and from the deployed position to the folded position without getting off the tractor. be able to. Moreover, since it does not use a cylinder mechanism or the like, it is lightweight and can be manufactured at low cost.

A lock device for automatically locking the working machine portion at the folding position and the unfolding position is provided, and when the working machine portion is rotated from the folding position to the unfolding position, the agricultural working machine is lowered by the three-point link hitch mechanism. In the process of unlocking and raising the agricultural implement slowly, when the weight load on the rotation fulcrum of the implement increases due to the elastic force of the spring, the implement automatically rotates to the deployed position. When the work machine is locked and is rotated from the deployed position to the folded position, the 3-point link hitch mechanism lifts the farm work machine to release the lock, and when the farm work machine is slowly lowered, work is performed by the spring's elastic force. When the weight load on the rotation fulcrum of the machine part becomes small, the work machine part automatically rotates to the folding position and is locked. Skilled in the art without getting off the tractor,
By unlocking the folding or unfolding position of the work implement and slowly raising and lowering the work implement, the work implement can be automatically opened and closed from the folded position to the deployed position and from the deployed position to the folded position. .

[Brief description of drawings]

FIG. 1 is a plan view of an entire folding type scraping harrow according to the present invention.

FIG. 2 is a rear view of the same.

FIG. 3 is a side view of the same.

FIG. 4 is a side view of the work unit raised and lowered in a folding position.

FIG. 5 is a side view of the work machine unit moved up and down in a deployed position.

[Explanation of symbols]

1 generation scraping harrow 2 connection part to tractor 3 speed change gear box 3a input shaft 4 central part of scraping harrow 5L left working machine part 5R right working machine part 6 rotary shaft (rotation fulcrum) 7 transmission shaft 8 transmission frame 9 chain transmission Case 10 Support frame 11 Rotary shaft 12 Crushed soil / Claw scraper 13 Crushed soil / Craft rotor 14 Dog clutch 15 Shield cover 16 Apron 17 Leveler 17a Hinge 17b Extension leveler 18 Gas spring 19 Lock device 20 Lock release lever 21 With wheel Stand 22 Extension leveler operation device

Claims (2)

(57) [Claims] 1. A longitudinal center part of an agricultural work machine is mounted on a rear part of a tractor via a three-point link hitch mechanism so as to be vertically movable, and power is transmitted from the tractor to the central part of the agricultural work machine, and the central part is also provided. On the other hand, in the agricultural work machine that can be expanded by folding the working machine parts extending from the central part to the left and right sides respectively to the central part side, the agricultural work machine is divided into three parts, the central part and the left and right working machine parts. The left and right end portions of the central portion and the inner end portions of the left and right working machine portions are rotatably connected to each other by a rotation fulcrum so as to be directed obliquely rearward at an angle of approximately 90 °, and the compression direction is applied to the front side orthogonal to the rotation fulcrum. A spring was installed, and the work machine part was automatically opened and closed by the balance between the weight change to the rotation fulcrum of the left and right work machine parts due to the lifting and lowering of the agricultural work machine and the elastic force of the spring. Automatic opening / closing device for folding work machines. 2. A lock device for automatically locking the working machine portion at each of the folding position and the unfolding position is provided, and when the working machine portion is rotated from the folding position to the unfolding position, 3
The point link hitch mechanism lowers the farm work machine to unlock it, and when the weight load on the rotation fulcrum of the work machine section becomes larger than the elastic force of the spring in the process of slowly raising the farm work machine, the work machine section automatically When the working machine is rotated from the deployed position to the folded position, the agricultural work machine is lifted by the three-point link hitch mechanism to release the lock and the agricultural work machine is slowly moved. In the process of lowering, when the weight load on the rotation fulcrum of the work implement part becomes smaller than the elastic force of the spring, the work implement part automatically rotates and is locked in the folded position. The automatic opening / closing device for a folding work machine according to claim 1.