JPH0582203U - Tillage depth detector - Google Patents

Abstract

(57) [Abstract] [Purpose] A cultivator is mounted on the rear part of the tractor body so that it can be moved up and down through a link, and the link is made to move up and down by a lift arm, and the tilling depth of the cultivator is detected by a tail wheel. However, the vertical displacement of the tail wheel is transmitted to the control device of the tractor body, and stable automatic control of the working depth is performed without being affected by grass roots, rice stocks, etc. mixed in the cultivated soil, and the working depth is simple. To be able to add or release the automatic control function. [Composition] A cultivating device is attached to a rear part of a tractor main body so as to be able to move up and down via a link, and the link is moved up and down by a lift arm. A tail wheel support is rotatably connected to the cultivating device and an ammunition is provided. The support frame is urged downward by a machine, and the support frame is connected to the tail wheel adjusting device so as to be vertically rotatable by a connecting tool, and is also linked to a control device mounted on the tractor body by a transmission means such as a wire or a rod. The digging depth is detected based on the displacement amount of the tail wheel.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a tilling depth detecting device that automatically controls the tilling depth of a tiller attached to a rear portion of a tractor body via a link.

[0002]

[Prior Art]

 A cultivator is attached to the rear part of the tractor main body so that it can be moved up and down via a link, and the above-mentioned link is moved up and down by a lift arm.To detect the working depth of the cultivator, the rotation amount of the rear cover is set to It is already known to automatically control the working depth by transmitting it to a control device such as a detector or a hydraulic valve provided on the side surface of a mission case via a transmission means such as a wire or a rod.

[0003]

[Problems to be solved by the device]

 As described above, in order to detect the working depth of the tilling device, the rotation amount of the rear cover is transmitted by interlocking with the detector provided on the side of the mission case of the tractor body via a wire, and the controlling device determines the working depth. With the automatic control, since the soft soil that has been cultivated is pressed on the entire surface of the rear cover, not only is the air permeability of the cultivated soil lost and the effect of the cultivated soil reduced, but also grass roots mixed with the cultivated soil and the mass of rice stocks and the like. When the rear cover rides up, the vertical position of the lower surface of the rear cover, which should function as a sensor, fluctuates, and the precision of the plowing depth automatic control becomes inaccurate, resulting in variations in plowing depth.

[0004]

[Means for Solving the Problems]

 According to the present invention, a cultivating device is attached to a rear portion of a tractor body so as to be capable of moving up and down via a link, and the link is moved up and down by a lift arm. With the aid of an ammunition, the support frame is connected to the tail wheel adjusting device so that it can be moved up and down by a connecting tool, and a transmission device such as a wire or a rod is used to connect to the control device mounted on the tractor body. The above-mentioned problems have been solved by being configured to detect the working depth based on the displacement amount of the tail wheel in a linked manner.

[0005]

[Action]

 Tractor When plowing work with a tilling device suspended via a link at the rear of the machine, if you set the required plowing depth in advance and proceed with the work, the tail wheel will roll on the platter while plowing depth. The support frame rotates accordingly, and the rotation amount is transmitted to the control device provided on the tractor by the transmission means, and the lift arm is vertically rotated by hydraulic pressure until the required working depth is reached. To control the working depth automatically. In this case, since the support frame of the tail wheel is urged to rotate downward, not only when the tail wheel moves from the concave portion to the convex portion of the tiller, but also when the tail wheel shifts from the convex portion to the concave portion. Rolls following the tiller. In this way, when the tilling depth is detected by the tail wheel, it is possible to detect the tilling depth accurately without compressing the cultivated soil cultivated by the rear cover or riding on weeds or rice stocks, unlike the conventional one. You can

[0006]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. The tiller 1 includes a lower link 5 axially supported by lower link pins provided on the left and right below a rear portion of a mission case 2 of an agricultural tractor, and a rear center of a mission case 2. It is suspended by a top link 6 which is rotatably attached to a top link support which is attached to the rear so as to open rearward, and the front part of the tiller 1 is detachably attached to a hitch frame 7. On the other hand, the tip of a lift arm 4 disposed on the left and right sides of the hydraulic case 3 above the mission case 2 and the intermediate point of the lower link 5 are connected by a lift rod, and the rotation of the lift arm 4 causes the tiller 1 to rotate. Is mounted so that it can be raised and lowered.

A support frame 12 is rotatably supported by a support shaft 12b from a main frame integrated with a gear case at the center of the cultivator 1 toward the rear, and a tail wheel 15 rolling on the cultivator is provided at a rear end of the support frame 12. Is rotatably supported. A top mast 13 composed of two L-shaped plates in a side view is integrally erected on the front part of the tiller 1 to support a gear case below and a tail wheel adjuster 14 at the rear. is doing.

The tip of the tail wheel adjusting device 14 and the connecting metal 12a fixed to the lateral frame of the support frame 12 are directly coupled with each other by a pin 16a or a bolt as shown in FIG. 1, or as shown in FIG. The support frame 12 is connected to the tail wheel adjusting device 14 by a pair of left and right link plates 16 and pins 16a and 16b so that the support frame 12 can move up and down within a predetermined range, and a sensor is provided on the front portion of the support frame 12. The pressure rod 18 having the arm 17 fixedly hung down and the front end rotatably connected to the sensor arm 17 penetrates the rear end of the pressure rod 18 into the receiving metal 19 on the rotary cover 21 and the compression spring 20. Since it is urged to push out by being interposed, the support frame 12 can freely rotate by the vertical movement of the tail wheel 15 against the compression spring 20. Becomes

In addition, the tip of the sensor arm 17 is connected to a control valve (control device) of a hydraulic cylinder for vertically rotating the lift arm 4 via a wire 22 and a link 23, or the front end of the wire 22 is adjusted with a potentiometer. The vertical displacement of tail wheel 15 is transmitted to the control device by connecting to a detector (control device) consisting of, and the lift arm 4 is rotated by hydraulic pressure until the preset working depth is reached to automatically adjust the working depth. Control.

The rear cover 11 is rotatably suspended from the rear portion of the rotary cover 21. The suspension rod 21a connected to the bracket on the rotary cover 21 is inserted into the receiving metal under the connecting metal 12a to form a spring. Since it is hung by being locked with a pin or the like, it can catch the cultivated soil or approach the surface of the soil even during deep plowing.

As shown in FIG. 3, when the cultivating device 1 is shallower than a predetermined working depth, the cultivating device 1 is tilted forward in a side view, the tail wheel 15 is lifted from the cultivator, and the weight behind the support frame 12 and the compression are increased. The downward rotation bias of the spring 20 causes the support frame 12 to rotate in the direction A to B around the support shaft 12b, thereby rotating the sensor arm 17 forward and connecting the wire 22 to the tip thereof. The displacement amount of the tail wheel 15 is transmitted to the control device via the link 23, and the lift arm 4 is rotated by hydraulic pressure until the preset working depth is reached, thereby acting to deepen the working depth.

Further, as shown in FIG. 4, when the plowing device 1 is going to be deeper than a predetermined plowing depth, the tilling device 1 is tilted backward in a side view, the tail wheel 15 receives a reaction force from the tiller, and the support frame 12 is Since it rotates in the direction C to D against the compression spring 20 around the support shaft 12b at the tip, the sensor arm 17 rotates rearward, and the sensor arm 17 rotates backward and the tail is connected via the wire 22 and the link 23 connected to the tip. The displacement amount of the wheel 15 is transmitted to the control device, and the lift arm 4 is rotated by hydraulic pressure until the preset working depth is reached, so that the working depth is shallowed and the working depth is automatically controlled.

On the other hand, when a sowing machine or the like is attached to the rear part of the cultivating device 1 to perform the cultivating and sowing operations at the same time, the weight of the rear part is heavy, so that stable work is performed. 12a and the tip of the tail wheel adjusting device 14 are directly connected by a pin 16a to release the above-mentioned automatic working depth control function, and the handle above the tail wheel adjusting device 14 is manually turned to adjust the working depth. In this way, the support frame 12 is used by switching between a state in which the support frame 12 can move up and down with respect to the tail wheel adjusting device 14 and a state in which the two are integrated, so that the function of automatically controlling the working depth by the tail wheel 15 is added or released. You can do it.

Further, FIG. 8 shows another example, in which the cultivating device 1 is attached to the rear part of the tractor body so as to be able to move up and down via the link and the hitch frame 7, and the link is moved up and down by the lift arm 4. None, in order to detect the working depth of the tiller 1, the amount of rotation of the rear cover 11 is transmitted to a control device provided in the hydraulic case 3 of the tractor body to automatically control the working depth by hydraulic pressure. A stay 15a for supporting the wheel 15 is rotatably supported with the rear ends of the left and right side covers 24 as fulcrums, and the stay 15a and brackets 25 provided upright on both ends of the rear cover 11 are provided with long holes and pins 27. The rear cover 11 is pivotally supported by the arc-shaped turning rail 29 and the upper top mast 13 are connected by the pulling lever 28, and the pulling lever 28 is lifted upward to move to the Q position. When fixed, the pivot rail 29 pivots forward and upward, and the rear cover 11 that interlocks with the pivot rail 29 has sufficient space between the traveling surface of the tail wheel 15 and the lower surface of the rear cover 11 without contact with the tilling soil. Therefore, grass roots and rice stock mixed in the tilling soil can be released backward, and the tail wheel 15 can automatically control the working depth. On the other hand, as shown in FIG. 9, when the pull-up lever 28 is pushed down and fixed at the P position, the pivot rail 29 pivots rearward and downward, and the pin 27 is guided by the elongated hole portion to be movable. Since the rear cover 11 descends until it comes into contact with the surface of the tilled soil, the rear cover 11 can detect the tillage depth and can have an automatic tillage depth control function. In this way, it is possible to switch the tilling depth automatic control function to the tail wheel 15 and the rear cover 11 only by changing the fixing position of the pulling lever 28 to the top mast 13.

[0015]

[Effect of the device]

 According to the present invention, a cultivating device 1 is attached to a rear portion of a tractor main body so that the cultivating device 1 can be moved up and down via a link, and the link is moved up and down by a lift arm 4. The support frame 12 is connected to the tail wheel adjusting device 14 by a connecting tool so as to be vertically movable and is connected to the control device mounted on the tractor body by a wire or Since the cultivating depth is detected by the displacement amount of the tail wheel 15 in conjunction with the transmission means such as a rod, the cultivating depth can be detected by the tail wheel 15 rolling on the tiller. Therefore, it is possible to improve the growing conditions of crops without compressing the soil cultivated by the rear cover 11 as in the conventional case. In addition, even if a large amount of weeds and the like are scraped on the surface of the soil by cultivating in the field where there are many weeds and rice plants, it is possible to reliably detect the working depth regardless of this.

[Brief description of drawings]

FIG. 1 is a side view of a tilling device in a state where automatic tilling depth control is released.

FIG. 2 is a side view of the tilling device in an automatic tilling depth control state.

FIG. 3 is a side view of the tilling device at the time of shallow tillage.

FIG. 4 is a side view of the tilling device at the time of deep plowing.

FIG. 5 is a perspective view of a support frame support portion.

FIG. 6 is a cross-sectional view showing the same fixed connection mode.

FIG. 7 is a cross-sectional view showing the same fixed connection mode.

FIG. 8 is a side view showing another example of the tilling depth control device.

FIG. 9 is a side view of the same as the above tilling device while controlling the working depth by sensing the rear cover.

[Explanation of symbols]

 1 Tilling device 4 Lift arm 11 Rear cover 12 Support frame 13 Top mast 14 Tail wheel adjusting device 15 Tail wheel 21 Rotary cover 23 Link 28 Pulling lever

Claims (1)

[Scope of utility model registration request] 1. A cultivating device 1 is attached to a rear portion of a tractor body so as to be able to move up and down through a link, and the link is moved up and down by a lift arm 4. The support frame 12 of a tail wheel 15 is attached to the cultivating device 1. The support frame 12 is rotatably connected and urged downward by a bullet.
Is connected to the tail wheel adjusting device 14 so as to be movable up and down by a connecting tool, and is linked to a control device mounted on the tractor body by a transmission means such as a wire or a rod to detect the working depth by the displacement amount of the tail wheel 15. A tilling depth detecting device characterized by being configured to.