JPH018083Y2 - - Google Patents

Description

[Detailed description of the invention] This invention adjusts a working machine such as a plow or tiller that is connected to a mobile agricultural machine such as a tractor so that it can rise and fall to a predetermined height above ground or underground depth as instructed by the operator. This invention relates to a work equipment lifting/lowering operating device that enables so-called position control operations for holding work equipment, as well as operations for hoisting the work equipment over ridges, etc. It was devised so that it can be easily performed in parallel with the steering and turning operations of mobile agricultural machinery.

The configuration of this invention is configured such that the detected lifting/lowering position of the working machine lifted/lowered by the hydraulic lifting mechanism matches the lifting/lowering instruction position instructed by the position controller 14. In the work equipment lifting/lowering operation device, the operating lever 29 of the position controller 14 is provided near the steering handle 15 and is configured to be rotatable to instruct the lifting instruction position.
9 can be brought into contact with a lifting holding contact 24 provided approximately along the rotating surface of the operating lever 29 in order to specify the work equipment lifting holding position by operating in a direction perpendicular to the rotating direction. It is configured as follows.

Next, the specific structure will be explained based on one embodiment shown in the drawings. As shown in FIG. This lower link 2,
The upper part of the working machine 4, which is pivotally connected to the rear end of 2, and the upper part of the mobile agricultural machine 1 are pivotally connected by a top link 5,
The rotating bases of the lift arms 6, 6 are fixed to the rear upper part of the mobile agricultural machine 1 to a lift shaft 7 rotatably supported,
Tips of lift arms 6, 6 and lower links 2, 2
The drive arm 9 is pivotally connected to the middle part by lift rods 8, 8, and the drive arm 9 is attached to the lift shaft 7.
is connected to the hydraulic piston 11 of the hydraulic cylinder 10, and as the hydraulic piston 11 moves forward and backward, the lift arms 6, 6 rotate up and down, so the lift rods 8, 8 move up and down, and the pin 3 , 3 so that the working machine 4 can move up and down.
Then, by supplying and discharging pressure fluid to and from the hydraulic cylinders 10 before and after this hydraulic piston 11, or by retaining the pressure fluid within the hydraulic cylinders 10, the work implement 4 can be held at any position. As shown in FIG. 3, the resistance wire of the position detector 12 formed by a potentiometer can be brought into sliding contact with the height detection arm 13 fixed to the lift shaft 7 by a single slider 12a. In addition, a position controller 14 consisting of a similar potentiometer is mounted on the handle shaft tube 16 in the vicinity of the steering handle 15 of the riding agricultural machine 1 with bolts 1.
7 and 17, and an operating lever 18 is attached to the rotating shaft 14a of the position controller 14, which is parallel to the cylinder core of the handle shaft cylinder 16.
The two-pronged base of is pivotally connected with a horizontal pin 19. A slider 14 that slides on the coil surface of this position controller 14 is integrated with the operating lever 18.
The output indicated by b and the output detected by the slider 12a of the position detector 12 are input to the comparator 20, and the output difference between the controller output and the detector output is sent to the electromagnetic switching valve 22 via the amplifier 21. When the operating lever 18 is placed at the highest tilling position H indicated by the two-dot chain line in Figure 2A, the lift arm 6 will be at the highest position from the ground during tilling operations, and the operating lever 18 will be moved to the right. As it rotates, the lift arm 6 gradually descends, and the plowing depth of the work implement 4 gradually increases.If the operating lever 18 is placed at the lowest plowing position L shown by the dotted line in the figure, the lift arm 6 will be lowered. During tilling work, the output of the position controller 14 is controlled by the electromagnetic switching valve 22 so that the position is the lowest from the ground and the plowing depth is also the deepest.
When the output difference between the controller output and the detector output is, for example, (+), that is, when the position controller 14 When the work machine position is lower than the work machine instruction position, the electromagnetic switching valve 22 supplies pressure fluid to the hydraulic cylinder 11 in the direction in which the lift arm 6 rises, and as a result, when the lift arm 6 rises, When the output difference gradually decreases and reaches 0, the electromagnetic switching valve 22 closes the pressure fluid inlet and outlet of the hydraulic cylinder 11, stops the movement of the hydraulic piston 10 in and out, and leaves the lift arm 6 as it is. It is constructed so that it can be held in position. Then, a fan-shaped lifting holding contact 24 and a tilling work contact 25 centered around the rotating shaft 14a are placed in a controller case 23 in which the position controller 14 is housed, and the slider 14b of the position controller 14 makes sliding contact. The rotating bases of the contact pieces 26, which are provided at the top and bottom over the same range as the operating angle, and whose contact portions are exposed, are inserted into the aforementioned pin 19, and the pin 19 is straddled between the contact piece 26 and the operating lever 18. Stretch the toggle spring 27 and attach it to the controller case 23.
When the operating lever 18 protruding from the rectangular notch 23a provided in the notch 23a is rotated up and down as shown by the solid line or the two-dot chain line in FIG. As each rotational extreme position is reached, the contact pieces 26 touch the lifting holding contact 24.
Alternatively, when the tilling work contact 25 is formed so as to be able to switch and rotate, and the operating lever 18 is placed in the work equipment lifting holding position U shown by the two-dot chain line in the same figure, the output from the lifting holding contact 24 is transferred to the limiter 28. is set to a certain size and input to the comparator 20, so that the lift arm 6 is lifted and held at a certain work equipment lifting position where the work equipment 4 is lifted to the highest point above the ground. When the connection is made and the operating lever 18 is moved to the tilling work position W shown by the solid line in the figure, the contact piece 26 comes into contact with the tilling work contact 25 and is lifted to the height indicated by the slider 14b. The arm 6 will immediately descend, and the operating lever 18 will be moved to the rotation axis 1 while remaining in this tilling position W.
4a, the lift arm 6 rises or descends as described above, and the work implement 4 maintains the predetermined plowing depth specified by the slider 14b, thereby adjusting the plowing depth. It is configured to perform control operations.

In addition, a lift lever 29 is provided to raise and lower the work equipment 4 to an arbitrary height without detecting the height position, and the slider 29a of the lift lever 29 is brought into contact with the rise contact 30 or the fall contact 31. For example, during the contact time, the electromagnetic switching valve 22 continues to supply pressure fluid to the hydraulic cylinder 10 in the upward direction or downward direction of the lift arm 6, respectively.

Therefore, when it is desired to keep the work implement 4 elevated while traveling on the road or over a ridge, it does not matter whether the operating lever 18 is at any position from the lowest tilling position L to the highest tilling position H. When the operating lever 18 is pulled up and moved to the work equipment lifting holding position U shown in FIG.
By this operation, the lift arm 6 is rotated to a predetermined working machine lifting position and held there. Then, when the operating lever 18 is pulled down and rotated again to the tilling work position W, the contact piece 26 comes into contact with the lower tilling work contact 25, so that the lift arm 6 is moved up to the height indicated by the slider 14b.
is lowered, and the detection output of the slider 12a indicated by the height detection arm 13 that detects the momentary height of the lift arm 6 is compared with the output indicated by the slider 14b, and the electromagnetic switching valve Reference numeral 22 controls the supply and discharge of pressure fluid to the hydraulic cylinder 10, so that the working machine 4 can quickly return accurately to the tilling position before lifting.

If the operating lever 18 is rotated around the rotation axis 14a along the grip ring of the steering handle 15 while remaining in the tilling work position W, the tilling section of the work machine is moved, for example, to the ground at the highest tillage work position H. At the solid line position in Figure 2 A, the tilling section reaches a position 20 cm below the ground surface, and furthermore, at the lowest tilling position L, the tilling section reaches a depth of 30 cm from the ground surface. The tillage section is controlled so that it reaches .

As described above, according to this invented device, by operating the single operating lever 18 provided close to the steering handle 15 and abutting the lifting holding contact 24, the tiller can be used, for example, when going over a ridge. By immediately lifting and holding the working machine 4 during work, and pulling the operating lever 18 away from the lifting holding contact 24 after crossing the ridge, the plowing depth can be immediately returned to the plowing depth before hoisting. In this manner, it is possible to temporarily lift and hold the work implement 4 during plowing work with great ease, and moreover, these operations on the operating lever 18 provided near the steering handle 15 can be performed with ease. This operation also has the advantage that the turning operation of the steering handle 15 can be performed at the same time.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view of a riding agricultural machine to which the work equipment lifting/lowering operating device according to the invention is applied, Fig. 2A is a partially cutaway plan view showing the state in which the operating lever is attached to the device according to the invention, and Fig. 2B is a partially cutaway side view FIG. 3 is a partially cutaway side view of FIG. Description of symbols, 1... Mobile agricultural machine, 2... Lower link, 3, 19... Pin, 4... Working machine, 5... Top link, 6... Lift arm, 7... Lift axis, 8... Lift rod , 9... Drive arm, 1
0...Hydraulic cylinder, 11...Hydraulic piston, 1
2...Position detector, 13...Height detection arm, 12a, 14b, 29a...Slider, 14...
...Position controller, 14a...Rotation shaft, 15...Steering handle, 16...Handle shaft tube, 17...Mounting bolt, 18...
...Operation lever, 20... Comparator, 21... Amplifier, 22... Solenoid switching valve, 23... Controller case, 23a... Notch, 24... Lifting holding contact, 25... Tilling work contact, 26... ...Contact piece, 2
7...Toggle spring, 28...Limitsuta, 29...
Elevating lever, 30... Ascending contact, 31... Descending contact, H... Maximum tilling work position, L... Lowest tilling work position, U... Working machine lifting holding position, W... Tilling work position.

Claims (1)

[Scope of utility model registration request] A work equipment lifting/lowering operating device configured to control a detected lifting/lowering position of a working machine lifted/lowered by a hydraulic lifting mechanism to match a lifting/lowering instruction position instructed by a position controller,
The operating lever of the position controller is installed near the steering handle, and the operating lever is configured to be able to rotate to instruct the raising/lowering command position.The operating lever is operated in a direction perpendicular to the above-mentioned rotational direction to lift the work equipment. A working machine lifting/lowering operating device for a mobile agricultural machine, characterized in that the lifting holding contact provided substantially along the rotation surface of the operating lever can be contacted in order to indicate the holding position.