JPH0623408U - Lifting lifter structure of walking type agricultural work machine - Google Patents

Abstract

(57) [Summary] [Purpose] The impact force transmitted from the traveling wheels to the balance arm is
The number of parts can be reduced and the structure can be simplified by absorbing buffer ammunition without making it. [Structure] The wheel transmission case 9 of the traveling wheel 2 and the balance arm 14 are connected by a connecting rod 17 having a bent portion 17a.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lifting lifter structure for a walk-type agricultural work machine such as a rice transplanter, a fertilizer applicator, and a seeder.

[0002]

[Prior art]

 Generally, in this type of walk-type agricultural work machine, the balance arm connected to the wheel transmission case of the left and right traveling wheels by a connecting rod and a link is translated in parallel by the operation of the cylinder so that the left and right traveling wheels move in the same direction. Some are configured to move up and down to control the attitude of the aircraft.

[0003]

[Problems to be solved by the device]

 However, in the conventional one, since the impact force from the traveling wheel is also received by the balance arm through the connecting rod and the link and also by the balance arm through the balance arm, each member of the balance arm and the cylinder becomes particularly large. It is necessary to use a product with high bending rigidity and firmly mount it. As a result, there is a problem that not only the size of the entire apparatus is increased, but also the weight of the machine is reduced and the cost is reduced. There is also a special buffer mechanism between the balance arm and the cylinder that absorbs the impact force from the traveling wheels. However, such a machine has a large number of parts, and the device can be made compact and lightweight. I couldn't.

[0004]

[Means for Solving the Problems]

 The technical means taken by the present invention to solve the above problems is to move the balance arm connected to the wheel transmission case of the left and right traveling wheels with a connecting rod in parallel by the operation of the main cylinder to move the left and right traveling wheels. In the walking type agricultural working machine in which the machine body is vertically moved in the same direction to control the lifting and lowering of the machine body, the connecting rod is formed with a bent portion that absorbs an impact force from the left and right traveling wheels.

[0005]

[Action]

 The lifting and lowering control of the aircraft is performed by the operation of the hydraulic actuator as in the conventional one. The connecting rod has a bent part formed between the connecting part of the swing arm and the balance arm, and when a sudden shock is applied to the traveling wheel, the bent part absorbs and absorbs the shock. , No impact to the balance arm or hydraulic actuator.

[0006]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 is a walk-behind rice transplanter, and an engine 3 and a mission case 4 are vertically stacked on the front part of the body of the rice transplanter 1. At the rear part of the machine, a planting work part 7 including a seedling mounting table 5, a planting mechanism 6 and the like is arranged, and on the left and right of the machine, an output shaft 8 protruding from the left and right side surfaces of the mission case 4 is vertically moved. A traveling wheel 2 is pivotally supported by an axle 2a via a wheel transmission case 9 which is swingably supported. Then, the power of the engine 3 is configured to be transmitted to the planting work unit 7 and the traveling wheels 2 via the mission case 4. Further, the mission case 4 and the planting work section 7 are integrally connected and supported by the machine body frame 1a, and the connection height of the machine body frame 1a is set lower than the axles 2a of the left and right traveling wheels 2.

Reference numeral 11 denotes a double-acting main cylinder device, which is composed of a piston rod 11 a, a cylinder cylinder 11 b, etc., and is located in front of the engine 3 and the transmission case 4 in a front low rear height state. It is installed at a slant and is almost vertical. One end of the piston rod 11a is integrally fixed to the upper cylinder head portion of the engine 3 via a bracket 12, and the other end is integrally attached to the front end portion of the mission case 4 via a bracket 13 protruding forward. It is fixed in a fixed state immovably with respect to the machine body, and is composed of a double rod type cylinder in which the cylinder cylinder 11b moves in the rod longitudinal direction with respect to the piston rod 11a based on hydraulic operation. Has been done.

Reference numeral 14 is a balance arm that is long in the left-right direction, and an intermediate portion of the balance arm 14 is swingably supported by a pin shaft 15 that is provided so as to project from the upper end of the cylinder cylinder 11b in the front-rear direction. Further, an upper end of a connecting rod 17 having bent portions 17a is formed in a circular shape 17b at both left and right ends of the balance arm 14, the circular shape 17b is pivotally connected by a pin 16, and the lower end of the connecting rod 17 is Similarly, it is pivotally connected by a pin to a swinging arm 8b formed on the base end boss 8a of the wheel transmission case 9 so as to project therefrom.

The balance arm 14 pushes and pulls in parallel with the vertical movement of the cylinder cylinder 11b associated with the operation of the main cylinder device 11, which causes the wheel transmission case 9 to move up and down at the same time via the connecting rod 17. It is configured to swing and move the left and right traveling wheels 9 up and down simultaneously with respect to the machine body.

The swing arm 8b is configured to project straight from the base end boss 8a of the wheel transmission case 9 toward the center line of the wheel transmission case 9 toward the front. It is designed so that it can be shared on the left and right sides, and the number of parts can be reduced. The swing arm 8b is positioned as close to the front of the machine as possible to improve the front-rear balance of the machine and to swing the swing arm 8b. By setting the direction to be the vertical direction, the main cylinder device 11 can be arranged in a vertical posture.

Reference numeral 19 is a sub-cylinder device for horizontal control, and the sub-cylinder device 19 is composed of a piston rod 19a and a cylinder barrel 19b. The main cylinder device 11 has a cylinder barrel 11b, a balance arm 14 and a balance arm 14. In the meantime, the lower end of the cylinder tube 19b is pivotally supported by a bracket provided on the cylinder tube 11b, and the tip of the piston rod 19a is pivotally supported at a connecting position on one side of the balance arm 14. Then, based on the expansion / contraction operation of the piston rod 19a of the sub cylinder device 19, the balance arm 14 is swung with the pin shaft 15 as a fulcrum to vertically move the left and right traveling wheels 9 in the anti-reverse direction to perform rolling control of the machine body. However, this is arranged in parallel with the cylinder cylinder 11b of the main cylinder device 11 close to one side thereof. As a result, the space between the main cylinder device 11 and the float 20 is eliminated as much as possible to make the posture control mechanism extremely compact, and the piston of the sub-cylinder device 19 is used for the rolling control during left tilting and right tilting. The swing amount of the balance arm 14 is made to coincide with the extension / contraction operation length of the rod 19a. As shown in FIG. 1, the balance arm 14 is provided with a lock mechanism 18 for restricting the swinging operation of the balance arm 14, and the lock and unlock operations can be performed by operating the handle 21.

Reference numeral 23 denotes a hydraulic valve device that controls the operation switching between the cylinder devices 11 and 19, and has a structure described later, but has a spool type valve and a rotary type valve installed therein. A gravity sensor 24 is pivotally supported so as to be swingable left and right so as to be positioned at a lateral center portion of the vehicle body on one side of the hydraulic valve device 23. A spool valve spool 19 for controlling 19 is provided so as to project and retract freely. When the body tilts to the left or right, the tilt is detected by the left and right swing of the gravity sensor 24, and by transmitting this detection to the hydraulic valve device 23, the auxiliary cylinder device 19 is expanded and contracted to tilt the body. It is designed to restore the original horizontal posture.

On the other side of the hydraulic valve device 23, a rotor 26 of a rotary valve for controlling the main cylinder device 11 is rotatably projected. The rotor 26 operates the main cylinder device 11. Switching is performed as follows. That is, when the float 20 swings up and down with respect to the machine body by the rear horizontal axis (not shown) as a fulcrum due to the unevenness of the cultivator, this is transmitted to the rotor 26 via the rod 27 by a detector not shown, As a result, the hydraulic control of the main cylinder device 11 is performed and the floating body is restored to its original proper posture.

An auxiliary seedling frame 32 is provided behind the tapered bonnet 31 that covers the balance arm 14, the cylinder devices 11 and 19, the engine 3, the hydraulic valve device 23 and the like. A lateral hook of the auxiliary seedling frame 32 is integrally formed so as to project from the auxiliary seedling frame 32, and a loop-shaped hook 32a is formed at the tip thereof. The hook 32a has a handle for the recoil starter of the engine 3. 3a is configured to be locked, and the number of parts is reduced because the handle 3a of the recoil starter is locked.

In the embodiment of the present invention configured as described above, the swing arm 8b and the balance arm 14 which are integrated with the base end boss 8a of the left and right wheel transmission case 9 via the connecting rod 17 having the bent portion 17a. , And the balance arm 14 is moved in parallel by the operation of the main cylinder device 11 to control the lifting and lowering of the machine body, and the operation of the auxiliary cylinder device 19 causes the balance arm 14 to swing to control the rolling of the machine body. However, the impact force from the traveling wheel 9 is applied to the connecting rod 17 as a pulling force, and this pulling force is alleviated and absorbed by the bent portion 17a formed on the connecting rod 17, so that the balance arm 14 and the cylinder device are provided. The shock does not spread. Therefore, the inconvenience that the impact force from the traveling wheels 9 is transmitted to the cylinder device as it is can be solved without providing a buffer mechanism as in the conventional case, and as a result, the number of parts is reduced and the structure is simplified. It is possible to reduce the size and weight of the device.

[0016]

[Effect of device]

 As described above, according to the present invention, the balance arm, which is connected to the wheel transmission case of the left and right traveling wheels by the connecting rod, is translated by the operation of the main cylinder, and the left and right traveling wheels are moved up and down in the same direction to raise and lower the machine body. In the walking type agricultural working machine that performs control, the connecting rod has a bent part that absorbs the impact force from the left and right traveling wheels.Therefore, it is extremely simple without the need for a special buffer ammunition machine. With the configuration, the cylinder device can be protected, the number of parts can be reduced, the structure can be simplified, and the device can be reduced in size and weight.

[Brief description of drawings]

FIG. 1 is a front view of a lift lifter structure.

FIG. 2 is a perspective view showing a lift lifter structure.

FIG. 3 is a side view of a walk-behind agricultural work machine.

FIG. 4 is a perspective view showing an auxiliary seedling stand.

[Explanation of symbols]

 1 walking type agricultural working machine (walking type rice transplanter) 2 traveling wheel 9 wheel transmission case 11 main cylinder 14 balance arm 17 connecting rod 17a bending part

Claims (1)

[Scope of utility model registration request] 1. A walk in which a balance arm, which is connected to a wheel transmission case of the left and right traveling wheels by a connecting rod, is moved in parallel by the operation of a main cylinder and the left and right traveling wheels are moved up and down in the same direction to control the lifting and lowering of the machine body. A lifting agricultural lifter structure for a walk-behind agricultural work machine, wherein the connecting rod is formed with a bent portion for absorbing impact force from the left and right traveling wheels.