JP2005087180A - Tractor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tractor making it possible to smoothly adjust a height of a coupling part of the rear part of the tractor to a height of a coupling part of a working machine, by operating levers and switches for raising and lowering the working machine mounted on the rear part of the tractor. <P>SOLUTION: This tractor is equipped with a switch 17b for raising and lowering lift arms 11, 11 or a switch 17a for expanding and contracting a lift rod cylinder 6e, or both the switches 17a, 17b, at the rear part of a travelling machine body, and further equipped with a raising and lowering speed controller 19 for controlling a raising and lowering speed of lift arms 11, 11 or a expanding and contracting speed control tool 18 for controlling an expanding and contracting speed of the lift rod cylinder 6e, or both the control tools 18, 19, in an area neighboring on the switches 17a, 17b. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a tractor work machine connection control device.

When connecting a working machine such as a rotary tiller to the rear part of the tractor, it is difficult to adjust the height of the connecting part while operating the hydraulic operation lever while riding on the tractor. Go to the tractor and adjust the height of the connecting part of the rear part of the tractor to the height of the connecting part of the work machine by operating the levers and switches for raising and lowering the working machine provided at the rear part of the machine. There is something to concatenate.
(See Patent Documents 1, 2, and 3)

Japanese Patent No. 2708411 Japanese Patent Publication No. 7-89766 Japanese Patent No. 2549204

However, this is because the lift arm is moved up and down at a constant lifting speed by a hydraulic lifting device when a lever or switch for raising and lowering the work machine is operated. There is a problem that the speed is too slow and the installation work takes time and the efficiency is poor, and conversely, for those who are not familiar with the work equipment installation work, the lift arm lifting speed is too fast and the work equipment installation work is difficult There was a case.
In addition, the tractor connects the upper link at the top and the lower link provided at the left and right of the lower part to the link connecting part provided at the work implement by a connecting pin, and the lower link to tilt the work implement from side to side with respect to the tractor One of the pair of left and right lift rods connecting the lift arm and the lift arm is provided with a lift rod cylinder, and the lower link can be moved up and down independently by expanding and contracting the lift rod cylinder. Although it is structured to rotate, the extension / contraction speed of this lift rod cylinder is constant as well as the lifting / lowering speed of the lift arm. There is a problem that the extension speed is too slow and the installation work takes time and the efficiency is poor, or conversely for the installation work of the work equipment It is for those who do not was also when the mounting operation of the working machine is too early expansion and contraction speed of the lift rod cylinder becomes difficult.
And it is also known to increase or decrease the lift arm lifting speed and lift rod cylinder expansion speed depending on the time the switch for lifting the work implement is pressed, especially for unskilled workers. There is a problem that it is difficult to obtain the lifting and lowering speed of the lift arm and the expansion and contraction speed of the lift rod cylinder intended by the operator, and that it is difficult to connect the working machine such as a rotary tiller.

  In order to solve the above problems, a tractor according to the present invention connects a work implement to a rear portion of a traveling machine body via a lifting link mechanism and suspends the lifting link mechanism by a lift arm via a pair of left and right lift rods And lifting and lowering the work implement based on the lifting and lowering operation of the lift arm, while interposing a lift rod cylinder on one of the left and right lift rods, and tilting the work implement based on the expansion and contraction operation of the lift rod cylinder And a lift speed adjusting tool for adjusting the lift speed of the lift arm in the vicinity of the switch. , Or the extension speed adjuster that adjusts the extension speed of the lift rod cylinder, or both adjustments It is characterized in that the provided.

  In short, the present invention sets the lifting speed of the lift arm or the expansion / contraction speed of the lift rod cylinder by an adjuster that adjusts the respective operating speed when connecting the working machine of the rotary tiller to the rear part of the machine body. After that, the lift arm is moved up and down by operating the lift switch, or the lift rod cylinder is expanded and contracted by operating the telescopic switch, so that the lift link mechanism at the rear of the tractor and the link connecting part of the work implement By performing the alignment easily, the connection work between the tractor and the work implement can be performed smoothly.

Next, embodiments of the present invention will be described with reference to the drawings.
In FIG. 1, the tractor 1 has a front wheel 2 and a rear wheel 3 driven by an engine, and a steering handle 5 is provided in front of the cockpit 4. A work machine 7 such as a rotary is detachably connected to the rear part of the tractor 1 via a lifting link mechanism 6, and the work machine 7 is driven by a transmission shaft from a power take-off shaft (not shown) at the rear part of the tractor 1. . The elevating link mechanism 6 includes a top link 6a and a pair of left and right lower links 6b, 6c, and the front end portions of the links 6a, 6b, 6c are connected to the rear portion of the machine body so as to be vertically rotatable. The work machine 7 has link connecting portions 8a and 8b at the upper and lower portions, and these link connecting portions 8a and 8b are connected to the rear end portions of the links 6a, 6b, and 6c through connecting pins 9. When connecting the work machine 7 to the lift link mechanism 6, the rear ends of the links 6a, 6b, 6c are aligned with the link connection parts 8a, 8b of the work machine 7, and connecting pins are formed from the left and right sides of the rear part of the machine body. 10 is attached and connected.

  At the rear part of the tractor 1, a pair of left and right lift arms 11 that rotate in the vertical direction are provided. The lift arms 11 and 11 are supported by a hydraulic case via a lift arm support shaft, and the lift arms 11 and 11 are rotated in the vertical direction by a lift cylinder 11a built in the hydraulic case. The pair of left and right lower links 6b and 6c described above are suspended on the lift arms 11 and 11 via lift rods 6d and 6d, respectively, and are rotated up and down in accordance with the rotation of the lift arms 11 and 11. The machine 7 can be raised and lowered.

  A lift rod cylinder 6e is interposed in one of the left and right lift rods 6d, 6d. When the lift rod cylinder 6e is expanded and contracted, the lower link 6c on the lift rod cylinder 6e side is independently turned up and down, and the work machine 7 can be tilted left and right.

  As shown in FIGS. 6 and 7, the top link 6a is configured such that one end of the top link support 6f is connected by a connecting pin 6g and the other end rotates. The top link 6a is a turnbuckle system that can adjust the length of the top link 6a according to the type of the work implement 7. Further, a ruler 12 that can be expanded and contracted from the center of rotation of the top link 6 a toward the tip of the top link 6 a is attached, and the ruler 12 changes the length of the top link 6 a determined by the type of the work machine 7. When the adjustment is made, it is confirmed whether the length of the top link 6a is a predetermined length.

A position lever 14 as a position setting device for operating the hydraulic lifting device 13 is provided on the side of the cockpit 4. When the position lever 14 is rotated in the front-rear direction, the amount of rotation of the position lever 14 is increased. Accordingly, the lift arms 11 and 11 rotate. A lift arm angle sensor 11c composed of a potentiometer that detects the rotation angle of the lift arms 11, 11 is provided on one side of the pivot shaft 11b of the lift arms 11, 11, and when the position lever 14 is operated, position setting is performed. A deviation between the set value by the detector and the detected value by the lift arm angle sensor 11c is obtained, and the lift solenoid 11a is controlled by controlling the raising solenoid 16a and the descending solenoid 16b by a command from the control unit 15 so as to eliminate this deviation. A position control mechanism for rotating 11 is configured.
The control valve of the hydraulic lifting / lowering device 13 is constituted by a solenoid valve, and is configured such that the spool of the control valve can be switched by selectively supplying a current to the raising solenoid 16a and the lowering solenoid 16b.

  The upper parts of the pair of left and right rear wheels 3 and 3 are covered with fenders 3a and 3b, and work machine system operation tools such as a position lever 14 that an operator who has boarded the tractor 1 operates while sitting on the cockpit 4 are concentrated. Are arranged.

As shown in FIGS. 3 and 4, a pair of left and right switches 17 a and 17 b that are operated while being lowered from the tractor 1 are disposed on the outer surfaces of the rear end portions of the left and right fenders 3 a and 3 b. Of the pair of left and right switches 17a and 17b, the switch 17a disposed on the fender 3a on the same side as the lift rod cylinder 6e is a lift rod for extending and retracting the lift rod cylinder 6e when the work implement 7 is mounted. The switch 17b, which is a switch and is disposed on the fender 3b on the other side, is a lift arm switch for raising and lowering the lift arms 11 and 11 when the work implement 7 is mounted. The lift rod switch 17 a is an automatic neutral return switch (two-contact switch) that can operate the lift rod cylinder 6 e to “extended side” and “contracted side”, and its operation signal is input to the control unit 15. An expansion / contraction speed adjustment switch 18 for adjusting the expansion / contraction speed of the lift rod cylinder 6e is provided in the vicinity of the lift rod switch 17a.
The lift arm switch 17 b is an automatic neutral return switch (two-contact switch) that can operate the lift arms 11, “upper” and “lower”, and an operation signal thereof is input to the control unit 15. In addition, a lift speed adjustment switch 19 for adjusting the lift speed of the lift arms 11, 11 is provided in the vicinity of the lift arm switch 17b.

The control unit 15 extends the lift rod cylinder 6e when an extension side operation signal of the lift rod switch 17a is input, and reduces the lift rod cylinder 6e when an extension side operation signal of the lift rod switch 17a is input. Let
Further, when the upper operation signal of the lift arm switch 17b is input, the lift arms 11 and 11 are raised, and when the lower operation signal of the lift arm switch 17b is input, the lift arms 11 and 11 are lowered.

  Therefore, when connecting the work implement 7 to the top link 6a of the tractor 1 and the pair of left and right lower links 6b, 6c, the operator 7 moves away from the cockpit 4 to the rear of the tractor 1, and first, the top link 6a After changing and adjusting the length according to the type of the work implement 7 and connecting to the link connecting portion 8a of the work implement 7, this time, the link connecting portion 8b of the work implement 7 is connected to the pair of left and right lower links 6b and 6c. .

The position of the rear ends of the lower links 6b and 6c is aligned with the link connecting portion 8b of the work machine 7. In this embodiment, the lift arm switch 17b disposed on the left fender 3b is used to adjust the rear end of the left lower link 6b. The height is adjusted by lifting and lowering the lift arms 11 and 11.
At that time, before the lift arm switch 17b is operated, the lift arm 11, 17 is operated by the lift arm switch 17b, for example, by the lift speed adjusting switch 19 of the lift arms 11, 11 provided in the vicinity of the lift arm switch 17b. When the lift arm 11 is to be moved up and down quickly, the lifting speed adjustment switch 19 is set to “fast”. On the contrary, when the lift arms 11 and 11 are moved up and down slowly by operating the lift arm switch 19, the lifting speed adjustment switch 19 19 is set to “slow”.
As a result, the lift arms 11 and 11 are raised or lowered by the lift arm switch 17b based on the operation of “lifting” or “falling”, but the lifting speed adjustment switch 19 is set to “fast”. In that case, the lift speed of the lift arms 11, 11 can be increased by flowing a large current through the electromagnetic proportional flow control valve 16a for raising or the electromagnetic proportional flow control valve 16b for lowering.

Further, when the lifting speed adjustment switch 19 is set to “slow”, the lifting speed of the lift arms 11 and 11 is increased by passing a small current through the raising electromagnetic proportional flow control valve 16a or the lowering electromagnetic proportional flow control valve 16b. Can be late.
As a result, the operator raises and lowers the rear end of the lower link 6b on the left side while repeating the “up” or “down” operation of the lift arm switch 17b and aligns it with the height of the link connecting portion 8b of the work implement 7. It can be connected by mounting the connecting pin 10.
Thereafter, the height of the rear end of the right lower link 6c is adjusted to the height of the link connecting portion 8b of the work machine 7 by the expansion and contraction of the lift rod cylinder 6e. The adjustment is performed by the lift rod switch 17a disposed in the right fender 3a. Do. At this time, before operating the lift rod switch 17a, the lift rod cylinder 6e provided in the vicinity of the lift rod switch 17a is operated, for example, by operating the lift rod switch 17a. When the rod cylinder 6e is to be expanded or contracted quickly, the expansion / contraction speed adjustment switch 18 is set to “fast”, and conversely, when the lift rod cylinder 6e is to be expanded or contracted slowly by operating the lift rod switch 17a, the expansion / contraction speed adjustment switch 18 is set to “slow”.
As a result, the lift rod cylinder 6e is extended or reduced by the lift rod switch 17a based on the operation of “extension side” or “contraction side”, but the expansion / contraction speed adjustment switch 18 is set to “speed”. In other words, the expansion / contraction speed of the lift rod cylinder 6e can be increased by flowing a large current through the expansion electromagnetic proportional flow control valve 20a or the reduction electromagnetic proportional flow control valve 20b.

When the expansion / contraction speed adjustment switch 18 is set to “slow”, the expansion / contraction speed of the lift rod cylinder 6e is decreased by flowing a small current through the expansion electromagnetic proportional flow control valve 20a or the reduction electromagnetic proportional flow control valve 20b. can do.
As a result, the operator raises and lowers the rear end of the right lower link 6c while repeating the “extension side” or “contraction side” operation of the lift rod switch 17a and aligns it with the height of the link connecting portion 8b of the work implement 7. It can be connected by mounting the connecting pin 10.

  As shown in FIG. 5, the control unit 15 is configured by using a microcomputer. On the input side, in addition to the switches described above, a position sensor 21 for detecting the lever position of the position lever, a lift arm 11, A lift arm angle sensor 11c that detects the arm angle of 11; a lift rod sensor 22 that detects the cylinder length of the lift rod cylinder 6e; a tilt sensor 23 that detects the left and right tilt angles of the traveling machine body; An inclination setting volume 24 and the like are connected, and on the output side of the control unit 15, a lift cylinder valve ascending solenoid 16a and a descending solenoid 16b, a lift rod cylinder valve elongating solenoid 20a and a reducing solenoid are connected. 20b etc. are connected.

  In the construction as described above, the working machine 7 is connected to the rear part of the traveling machine body 1 via the lifting link mechanism 6, and the lifting link mechanism is connected to the lift arm via a pair of left and right lift rods 6 d and 6 d. 11 and 11, and lifts and lowers the working machine 7 based on the lifting and lowering movement of the lift arms 11 and 11, while a lift rod cylinder 6 e is interposed in either the left or right lift rod 6 d, and the lift rod cylinder In the tractor 1 that tilts the work implement 7 based on the telescopic operation of 6e, a switch 17b that raises and lowers the lift arms 11, 11 or a switch 17a that expands and contracts the lift rod cylinder 6e to the rear of the traveling machine body or both switches 17a, 17b. The lift arms 11 and 11 are moved up and down in the vicinity of the switches 17a and 17b. Since the elevating / lowering speed adjusting tool 19 or the elongating / lowering speed adjusting tool 18 for adjusting the elongating / lowering speed of the lift rod cylinder 6e or both adjusting tools 18 and 19 are provided, the rear left and right lower links 6b and 6c at the rear of the traveling machine body In order to align the height of the end with the height of the link connecting portion 8b on the work machine 7 side, the lift arms 11 and 11 are lifted and lowered and the lift rod cylinder 6e is extended and retracted independently. The operator can set the lifting / lowering speed and the lifting / lowering speed of the lift arms 11 and 11 and the lift rod cylinder 6e in advance before performing each lifting / retracting operation, so the working machine 7 is connected to the tractor 1. It is possible to improve the workability of the connecting work.

It is a side view of a tractor. It is a principal part rear view of a tractor. It is a side view of the left fender which shows a lift arm switch and a raising / lowering speed adjustment switch. It is a side view of the right side fender which shows a lift rod switch and an extension speed adjustment switch. It is a block diagram of a control part. It is a side view which shows the elastic ruler which measures the length of a top link. It is a top view which shows the elastic ruler which measures the length of a top link.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tractor 6 Lifting link mechanism 6d Lift rod 6d Lift rod 6e Lift rod cylinder 7 Working machine 11 Lift arm 11 Lift arm 17a Lift rod switch 17b Lift arm switch 18 Telescopic speed adjuster 19 Lift speed adjuster

Claims (1)

  A work machine is connected to the rear part of the traveling machine body via a lifting link mechanism, the lifting link mechanism is suspended by a lift arm via a pair of left and right lift rods, and the work machine is mounted based on the lifting operation of the lift arm. While lifting and lowering, a lift rod cylinder is provided on one of the left and right lift rods, and in a tractor that tilts the work implement based on the expansion and contraction operation of the lift rod cylinder, the lift arm is moved up and down at the rear of the traveling machine body A switch, a switch that expands and contracts the lift rod cylinder, or both switches, and a lifting speed adjustment tool that adjusts the lifting speed of the lift arm, or a stretching speed that adjusts the stretching speed of the lift rod cylinder, is provided near the switch. A tractor characterized in that an adjusting tool or both adjusting tools are provided.

Images