JPH05227802A - Device for detecting working machine of tractor - Google Patents

Abstract

PURPOSE:To obtain the subject device which is neither controlled nor operated in a detached state of working machine by constituting a working region of a detector consisting of a control region and an OFF region and changing the working region during detachment and attachment of a working machine. CONSTITUTION:A working region of a detector 29 consists of a control region (a) and an OFF region (b). When a working machine is detached, the detector is operated in the OFF region and when the working machine is attached, the detector is operated at a starting point of detection or in the control region in the vicinity of the point.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tractor, to which a working machine is detachably connected via a hitch frame to the rear part of the machine, and a change in the working machine is detected by a detector mounted on the machine via transmission means. And a working machine detection device for a tractor.

[0002]

2. Description of the Related Art Conventionally, a hitch frame is attached to a rear portion of a tractor main body through a link, and a working machine is attached to and detached from the hitch frame. There is already known a tractor which is configured to be transmitted to and detected by a transmission means and which is used to control the working depth or the posture of the working machine.

[0003]

The tractor detects the working depth of a working machine, for example, a rotary tiller, by detecting the turning angle at the pivot of the rear cover or the amount of vertical movement of the pivot by the detector. The detection value and the set value of the set value provided in the operating section are input to the microcomputer, and the output signal outputs the lift arm up and down to automatically control the plowing depth to a desired plowing depth or to adjust the rear cover movement. However, the detection value for plowing depth control was set so that when the work implement was removed, the detection value was set to be the final detection value or within the detection area near the detection start point, so The control state was continued, whereby the control mechanism, for example, the lift arm or the like was operated by the comparison between the set value of the setter and the detected value of the detector.

[0004]

SUMMARY OF THE INVENTION According to the present invention, a hitch frame 7 is attached to a rear portion of a tractor main unit via a link, and a working machine is detachably connected to the hitch frame 7 to prevent fluctuation of the working machine. Tractor In a tractor having a detector mounted on the main body so as to detect through a transmission means, and an interrupting mechanism interposed in the vicinity of the hitch frame of the transmission means, the operation area of the detector is a control area and an OFF area. When the work implement is removed, the detector operates in the OFF region when the work implement is removed, and when the work implement is attached, the detector operates in the control start region from the detection start point or in the vicinity thereof. , The above-mentioned problem was solved by turning off the control system.

[0005]

[Operation] After assembly at the factory or before starting work,
When setting the detection value of the detector, with the work implement removed from the hitch frame, adjust the relationship between the passive member of the intermittent mechanism mounted on the hitch frame side and the transmission means on the tractor side to detect the detector. Make sure it is operating in the OFF region. Then
To mount the work implement, hang the upper part of the hitch frame on the upper connection part above the front part of the work device, and raise the hitch frame in this state, the work device will rotate forward around the upper connection part, The lower connection part is connected by. In the process, an interrupting mechanism arranged near the hitch frame is connected.
Then, by adjusting the relationship between the drive member of the transmission mechanism mounted on the front part of the working machine and the transmitting means on the working machine side and pushing the driven member by the driving member, the detector starts the detection start end of the control area. Be within the control area at or near the point. When removing the work implement, raise the work implement together with the hitch frame, lower the work implement with the lock released, and when it comes in contact with the ground, it will rotate rearward with respect to the hitch frame centering on the upper coupling part, The connecting portion is disengaged from the hitch frame, and at the same time, the connecting / disconnecting mechanism is turned off, the detector operates in the OFF region, and the detector is input to the microcomputer to turn off the various control systems.

[0006]

An embodiment of the present invention will be described with reference to the drawings. Lower links 2 are axially supported by lower link pins provided on the left and right below a rear portion of a mission case 1 of an agricultural tractor, and an upper rear portion of the mission case 1 is supported. Is connected to the lower link 2 by a pin at the tip of a lift rod 4 rotatably supported downward at the tips of lift arms 3 provided on the left and right sides of the. A top link support 5 that opens rearward is attached to the center of the rear surface of the mission case 1, and a front portion of the top link 6 is rotatably mounted in a hole at the tip of the top link support 5, and the top link 6 and the lower link. The rear end of 2 is connected to a hitch frame 7, and a rotary type tiller 9 as a working machine is detachably connected to the hitch frame 7. On the other hand, a PTO shaft projects in the lower center of the rear part of the mission case 1, and the yoke joint 8 transmits power to the cultivating shaft via the gear case 11 and the chain case 10 of the cultivating device 9.

The rear part of the hitch frame 7 has an L-shaped 2 in side view.
A top mast 12 formed by connecting a plurality of plates is erected, supports an arm of a lower tiller 9 through left and right mast stays 13, and supports a rear electric cylinder 16 and a tail wheel adjustment handle outer cylinder. Is formed.

On the upper surface of the rotary cover 14 supported by the gear case 11 and the chain case 10, there is provided a rotating rail 15 which is symmetrical in side view and has an arc shape in a side view. The rotating rail 15 is fitted to a guide roller. It is possible to move back and forth along the rotary cover 14 by being guided, and a lateral frame 17a pivotally attached to the upper end of the rear cover 17 is fixed to the rear end thereof, and the lateral frame 17a is The lower end of the electric cylinder 16 is rotatably connected by a pin.
A bracket 18 which is erected on the left side of the upper surface of the rear cover 17 is connected to a link 23 via a rod 19, a link 20 and a wire 21, and the link 23 is an input shaft cover fixed to the front surface of the gear case 11. The pin 22 is pivotally supported on the right side of 22.

Transmission bracket 7a at the center of the hitch frame 7
The middle part of the link arm 26 is pivotally attached to the lower part of the bracket 25 fixed to the right side surface of the link arm 26, and the rotating roller 27 is attached to the tip end of the link arm 26, and the other end is left side of the front mission case. The rear end of the inner of the wire 28 connected to the working depth detection sensor 29 mounted on the surface is connected, and the roller 27 is urged by the return spring 24 so that the upper portion thereof is rotated forward. Link 23
The upper bent surface of the mounting plate 25a provided upright on the bracket 25 is supported by screwing the outer part of the wire 28 so that the outer part of the wire 28 can be adjusted forward and backward. The portion serves as a stopper that receives the upper surface of the front portion of the link arm 26. At this time, the sensor arm 38 of the tilling depth detecting sensor 29, which connects the front end of the wire 28, is pulled forward by the spring 39, and therefore rotates clockwise in the drawing until the link arm 26 is received by the stopper. Stop. The working area of the working depth sensor 29 is composed of a control area and a relatively narrow (for example, 10 to 20 degrees) OFF area in front of the detection start end point X, and the position of the sensor arm 38 is such that a working machine is mounted. When the outer side of the wire 28 is not rotated, the nut 28a attached to the attachment plate 25a is rotationally adjusted to adjust the outer side of the link arm 26.
Is positioned in the OFF region while being in contact with the lower end of the mounting plate 25a. Next, the working machine is connected to the hitch frame 7, and the outer side of the wire 21 is attached with the roller 27 of the link arm 26 in contact with the rear surface of the link arm 23 (however, the rear cover 17 is in the shallowest plowing state). The nut 21a that is being rotated is rotationally adjusted so that the sensor arm 38 of the tilling depth detecting sensor 29 is positioned within the control region of the detection start end point X or its vicinity.

Further, the wire 28 is taken out from the hitch frame 7 obliquely upward in a substantially vertical direction, passes over the center line of the machine body, passes over the top link 6, and is provided on the left side surface of the transmission case 1 of the front tractor machine. Further, it is connected substantially horizontally to the tilling depth detecting sensor 29.

The rotating rail 15 moves back and forth in an arc shape along the upper surface of the rotary cover 14 as described above. The amount of movement of the rotating rail 15 is from a bracket provided to the left of the rear end of the rotating rail 15 to a link rod. Gear case 1 through 30
1 is transmitted to the upper part of a link arm 31 whose lower part is pivotally supported by a bracket 22b on the left side surface of the input shaft cover 22 fixed to the front part of 1.

On the left side surface of the transmission bracket 7a at the center of the hitch frame 7, a driven side link arm 33 is urged by a return spring 24 so that the upper portion thereof is moved rearward.
The roller 34, which pivotally supports the middle portion of the link arm 33 and is axially supported by the upper end portion of the link arm 33, is pressed against the front surface of the link arm 31, and the outer end of the wire 35 whose inner end is connected to the lower end portion of the link arm 33 is The upper end bent portion of the mounting plate 32 standing upright from the bracket 32a integral with the transmission bracket 7a is mounted by a nut 35a so as to be adjustable forward and backward, and the lower end of the mounting plate 32 serves as a stopper portion.

Before mounting the cultivating device 9 on the hitch frame 7, with the link arm 33 in contact with the stopper portion at the lower end of the mounting plate 32, the rotation detection mounted on the other side of the mission case 1 is detected. Sensor arm 3 of sensor 36
8 is adjusted so as to be located in the OFF region similarly to that of the cultivation depth detecting sensor 29, and the adjusting operation is performed by the nut 35a to which the wire 35 is attached. The link arm 31 is
The tiller 9 is connected to the hitch frame 7, and the rotating rail 15 is rotated rearward by the electric cylinder 16 so that the rear cover 17 is at the lowest position and the depth of cultivation is the shallowest, and
The link arm 31 is attached to the roller 34 of the link arm 33.
In the state in which the contact detection means is in contact, the length of the link rod 30 is adjusted so that the sensor arm 38 of the rotation detection sensor 36 is located at the detection start end point or in the control area in the vicinity thereof. The operation area of the rotation detection sensor 36 is
And a relatively narrow (for example, 10 to 20 degrees) OFF region in front of the detection start end point X at the end of the control region.

The wire 35 is taken out obliquely upward from the hitch frame 7 in a substantially vertical shape, and in symmetry with the wire 28 for controlling the working depth, passes over the center line of the machine body and passes over the top link 6, and the front tractor. The rotation detection sensor 36 provided on the right side surface of the mission case 1 of this machine is connected substantially horizontally.

As shown in FIG. 7, the front ends of the wires 28 and 35 taken out from the hitch frame 7 are connected to the working depth detecting sensor 29 and the sensor arm 38 of the rotation detecting sensor 36 in a substantially horizontal manner. 29 and the rotation detection sensor 36 are the same size brackets 37 provided symmetrically on the left and right side surfaces of the mission case 1 of the tractor unit.
The detection values of the rotation angles (operating angles) of both sensor arms 38, 38 are the same for both, and the working depth detection sensor 29 and the rotation detection sensor 3 are attached.
By clearly indicating the starting point position with a mark or a lamp at the position corresponding to the starting point position of the detection of the rotation angle of the sensor arm 38 of 6, the handleability is further improved.

Next, the mounting structure of the socket interposed in the harness 42 connecting the motor of the electric cylinder 16 and the battery of the present machine will be explained. The rear male socket 40 is a bracket screwed to the top mast 12. Four
The bracket 44, which is fixed to the No. 1 with a bolt and is screwed to the front female socket 43, has its lower portion pivotally supported in the vicinity of the top hook 7c of the hitch frame 7 by a lateral fulcrum shaft 7b so as to be rotatable back and forth. It is urged to rotate rearward by a return spring 45, and its rear surface is received by an operating lever 48 fixed to the upper end of a lock hook operating rod 47, and the lock hook operating rod 47 branches its lower part left and right. The lock lever 47a and the operating lever 48
Is fitted in an L-shaped guide groove 48a formed in the top hook 7c while being pulled rearward by a spring.

Further, the lower connecting pin 50 of the tiller is fitted into the lower hooks 51 fixed to both lower sides of the hitch frame 7, and the lock hook 47a is connected to the lower connecting pin 50. The bracket 44 is located at the lower front end of the groove 48a, whereby the bracket 44 pivots rearward about the fulcrum shaft 7b, so that the socket is in a connected state, and the driver in the driver's seat reaches for rearward to remove the work implement. When the operating lever 48 is pulled forward and then moved upward, the bracket 44 and the female socket 43 attached thereto pivot forward about the lower part in a forward tilted posture, and the lock hook 47a rises. Since it turns to the unlocked posture, the hitch frame 7 is in this state.
When the cultivator 9 is lowered and grounded, the cultivator 9
Pivots rearward about the upper connecting pin and away from the hitch frame 7, whereby the lower connecting pin 50 comes out of the lower hook 51. Then, when the hitch frame 7 is lowered, the upper hook a descends and comes out of the upper connecting pin. At that time, the bracket 44 and the female socket 43
Does not interfere with each other because it rotates forward and retracts from the rear male socket 40. Furthermore, male socket 4
When a car wash is performed by screwing a cover 49 that covers the rear surface and the outer surface of the socket to the bracket 41 to which 0 is attached,
It is designed to prevent water and the like from splashing during rainfall or during scratching work.

[0018]

According to the present invention, the hitch frame 7 is attached to the rear portion of the tractor main body through a link, and the working machine is detachably connected to the hitch frame 7 so that the fluctuation of the working machine can be transferred to the tractor main body. The mounted detector is made to detect through transmission means,
In a tractor in which an interrupting mechanism is interposed in the vicinity of the hitch frame 7 of the transmission means, the operation area of the detector is composed of a control area and an OFF area, and the detector is operated to the OFF area when the working machine is removed. However, since it is configured to operate within the control region of the detection start point or its vicinity when the working machine is installed, it is possible to operate the main switch of the control circuit without turning off the main switch each time when the working machine is removed. , No matter what the control posture of the working machine,
It becomes FF and the lift arm and other control mechanisms do not operate regardless of the set value of the setter.

[Brief description of drawings]

FIG. 1 is a side view in which a cultivator is attached to a tractor.

FIG. 2 is a plan view of the front part of the tiller.

FIG. 3 is a side view of the tilling depth control device.

FIG. 4 is a side view of a turning rail control device.

FIG. 5 is a front view of a hitch frame.

FIG. 6 is a plan view of a socket combined state.

FIG. 7 is a side view of the same.

FIG. 8 is a side view showing a state in which the sockets are separated from each other.

FIG. 9 is a side view showing a state where the hitch frame is lowered.

FIG. 10 is a side view of the tilling depth detection sensor.

FIG. 11 is a side view of a rotation detection sensor.

FIG. 12 is a side view of the locking device.

[Explanation of symbols]

 1 mission case 6 top link 7 hitch frame 7b fulcrum shaft 9 tilling device 11 gear case 15 turning rail 17 rear cover 20 link 21 wire 22 input shaft cover 27 roller 29 tilling depth detecting sensor 36 turning detecting sensor 38 sensor arm 39 spring 40 male Socket 43 Female Socket 44 Bracket

Claims (1)

[Claims] 1. A detector in which a hitch frame 7 is attached to a rear portion of the tractor main unit via a link, a working machine is detachably connected to the hitch frame 7, and fluctuations of the working machine are attached to the tractor main unit. In the tractor in which an interrupting mechanism is provided in the vicinity of the hitch frame of the transmitting means, the operating area of the detector is composed of a control area and an OFF area. Is OFF when the work machine is removed
A work machine detection device for a tractor, wherein the work machine detection device for a tractor is configured so that the work machine operates in a region, and when the work machine is attached, the work machine operates in a control start region or a control region in the vicinity thereof.