JPH0432887Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field The present invention has a structure in which the rotary tiller is automatically raised when the tractor moves backward, and the raised state can be achieved by simply releasing the gear shift lever from reverse. It is constructed so that it cannot be lowered.

(b) Prior art While working with a rotary tiller, the user forgets to lower the rotary tiller to the working state and puts the gear shift lever into reverse, causing the rotary tiller to become buried in the soil and unable to move backwards. Accidents in which equipment is pushed and parts damaged are a common occurrence due to operator error.

In order to avoid this mistake to the side of safety, there is a known technique in which the lift arm is rotated in the upward direction of the rotary tilling device as the gear shift lever is rotated backward to release the rotary tiller.

(c) Problems to be solved by the invention When the gear lever is operated to reverse, the rotary automatically rises, and when the operator notices this mistake and hastily moves the gear lever to forward or neutral. Immediately switching the rotary tiller down may cause injury to assistants in the vicinity of the tractor.

In this invention, a safety motor that rotates when the gear shift lever is operated in reverse is provided separately, and the rotation of the safety motor rotates the position control lever in the upward direction, thereby raising and rotating the rotary tiller when traveling in reverse. This is the structure that was designed to do so.

This safety motor mechanism returns to its original position immediately after the position control lever is raised, and in this return operation, the safety motor is operated so as not to link the return operation of the position control lever. a screw body,
The position control lever was brought into contact with the lever.

As a result, if the operator realizes that he or she has made a mistake and wants to lower the rotary for work again, the operator will have to rotate the position control lever in the downward direction again.
The rotary tiller is constructed so that it does not descend even if the speed change lever is operated in forward or neutral position.

(d) Means for solving the problems The problems to be solved by this invention are as described above.
Next, means for solving the problem will be explained.

Electric automatic depth control mechanism,
In addition to installing a mechanical manual position control mechanism, a back switch 19 is provided at the reverse position of the gear shift lever 8, and a screw body 61 that is moved forward and backward by a safety motor 60 can be brought into contact with the position control lever 4, thereby improving safety. motor 60
When the reverse switch 19 is turned ON by the reverse operation of the gear shift lever 8, the gear rotates forward, the screw body 61 is moved, the position control lever 4 is rotated to the highest position, and the position control switch 18 is turned OFF to perform depth control. When the automatic mode is stopped and the position control lever 4 comes into contact with the position control switch 18, the safety motor 60 is reversely rotated and the screw body 6
1 is the subsequent position control lever 4
When the rotary tiller is moved to a position where it can be freely lowered and the rotary tiller is lowered again, the position control lever 4 is configured to require manual rotation in the lowering direction by turning on the position control switch 18. This is what I did.

(e) Embodiment The purpose of the present invention is as described above, and the detailed structure of the present invention will be explained based on the structure of the embodiment shown in the attached drawings.

The configuration of the control device will be explained with reference to the drawing in FIG.

A hydraulic case 6 is mounted on the upper surface of a rear axle case 52 of an agricultural tractor, and a lift arm 13 is driven by a hydraulic cylinder 16 within the hydraulic case 6. Lift link 5 to lift arm 13
3 are connected to move the rotary tiller up and down.

The rotary tiller is composed of a tiller claw 17, a rear cover 2, a tiller cover 54, etc., and a tiller depth sensor 1 is provided on the tiller cover 54. This tilling depth sensor 1 is rotated by the link 3 as the rear cover 2 is rotated, and the tilling depth, which is the distance between the bottom surface of the rear cover 2 and the tip of the tilling claw 17, is converted into a rotation angle and taken out. be.

Reference numeral 20 denotes a control panel fixed to the dash board panel surface of the agricultural tractor, and an automatic switch 21 and a return switch 6 are mounted on the control panel 20.
0 is set. Automatic switch 21 is "off"
This is a switch with 3 positions for the pulse width: ``large'' and ``small.''

The tilling depth value of the depth control is set by rotating the tilling depth setting lever 5. The tilling depth setting lever 5 has a rotary encoder 2 at its tip as shown in Figure 3.
It is equipped with a voltage converter such as No. 2, which is used to set the plowing depth.

The tilling depth set value by the tilling depth setting lever 5 and the feedback value from the tilling depth sensor 1 are transferred to the controller 7.
Based on this judgment, a forward/reverse rotation command is issued for the control motor 9, and the motor 9, which rotates the depth control bar 40, is rotated in the forward and reverse directions.

Since the commands sent to the control motor are only forward and reverse rotation commands, the actual position of the spool 15 of the control valve 12 (raised, neutral, or lowered) is detected by the valve position detection switch 10, and the controller 7 It feeds back to the motor and determines whether to continue rotating the motor forward, stopping, or reversing.

11 is a rack and pinion case in which a rack and pinion device for slowing down the rotation of the control motor 9 is housed.

Reference numeral 19 indicates a back switch, which is the essential part of the present invention, and is turned on when the gear shift lever 8 is placed in reverse. Reference numeral 18 denotes a position control switch that is turned on when the position control lever 4 is raised to the highest position, such as when going around the edge of the field.

From the drawings in Figures 2, 3, and 4, the hydraulic case
Let me explain the specific configuration around the base 6. Hydraulic case
The fixing plate 2 of the control motor 9 is on the left side of the
A pinion rack case 11 including a pinion 23 and a rack 24 is fixed to the control motor fixing plate 25, and a control motor 9 and a valve position detection switch 10 are fixed to the pinion rack case 11.

Further, as shown in FIG. 3, a lever guide plate 46 is provided on the right side of the hydraulic case 6, and the position control lever 4 and plowing depth setting lever 5 are guided by this lever guide plate 46.

A position control lever switch 18 is also provided on the lever guide 46. Further, a rotary encoder 22 for setting the plowing depth is also fixed to the lever guide 46.

Tillage depth setting lever 5 is rotary encoder 2
2 only changes the voltage value, but does not directly move the depth control bar 40 or spool 15. On the other hand, the position control lever 4 sets the position control position by rotation. As a result, the hydraulic cylinder 16
When pressurized oil enters and the lift arm 13 rotates,
Through the link 45 and arm 44 in FIG.
The arm 34 shown in the figure rotates, the left end of the position control bar 35 moves in the opposite direction to the direction set by the lever via the link 50, and the return control is stopped until the spool becomes neutral.

The depth control device is set electrically by a rotary encoder 22, and by comparing this with the feedback plowing depth value from the tillage sensor 1, the control motor gradually moves the spool in the "up" or "down" direction. It moves to.

The rotation of the control motor 9 is the pinion 2
3. The rotation of the rack gear 24 results in the rotation of the arm 42 in the hydraulic case 6 via the arm and link 26, and the rotation of the depth control bar 40 to the right via the link 41.

Since the left side of the depth control bar 40 is not related to the plowing depth setting lever 5, it is fixed approximately at the center and does not rotate during normal control. However, if the control circuit fails electrically, the control motor 9 stops at the raised position of the spool 15, and when the rotary tiller cannot be lowered by the position control lever 4, the rotary tiller remains in the right lever guide 45. By removing the butterfly bolt 57 and retracting the fixed position of the depth control lever 47 to the lowering side of the spool 15, only the position control can be used at least.

By rotating the depth control lever 47, the depth control bar 40 is moved backward in the downward direction via the arm 38 and the link 39. Reference numeral 51 denotes a contact bar, which is provided in the vertical direction so that both the depth control bar 40 and the position control bar 35 can come into contact with the spool 15.

In FIG. 3, the lower end 63 of the position control lever 4 is extended downward from the pivot point, and the abutting body 62 is pivoted there. and,
The screw body 61 is configured to abut against the abutment body 62. The screw body 61 rotates the safety motor 60 in the normal direction.
The safety motor 60 is controlled by a command from the controller 7 when the back switch of the speed change lever 8 is turned on.

If the depth control is in automatic mode when the gear shift lever 8 is placed in reverse, the controller 7 commands the safety motor 60 to rotate forward and moves the screw body 61 to the right. As a result, the abutment body 62 and the position controller lever 4 rotate to the highest position, and when the rotation is finished, the controller reversely rotates the safety motor 60, and the screw body 61 rotates the position control lever 4 from then on. It is set to be evacuated so that it does not interfere with manual operation.

When the position control lever 4 is rotated to the highest position, the position control lever switch 18 is turned OFF and the automatic mode of the depth control system is immediately turned off. At this time, the depth control motor 9 stops regardless of its position. Therefore, when the gear shift lever 8 is put into reverse, the safety motor 60
rotates in the forward direction, raises the position control lever 4 to the highest position, raises the rotary tiller, and turns off the depth control using the switch 18.

Up to this point, everything is done automatically due to an operator's mistake, so even if the operator notices the mistake and immediately returns the gear shift lever 8 to forward or neutral,
The rotary was raised and the position control lever was left as it was.

Therefore, even if the gear shift lever 8 is returned to its original position, the rotary does not move down. If the operator wishes to lower the rotary, the operator should confirm the mistake and turn the position control lever 4 in the lowering direction again.
8 is turned on, the depth control returns to automatic mode and the rotary lowers at the set plowing depth.

In addition, the automatic switch 21 is turned off when the position control lever switch 18 is OFF.
1 is ON, the depth control becomes automatic mode.

When the automatic switch is turned off to end the depth control, the control motor 9 is configured to rotate until the spool 15 of the control valve 12 is in the downward position, and at that position the rotation of the motor 9 is stopped. .

(f) Effects of the invention Since the invention is constructed as described above, it has the following effects.

First, even if the operator makes a mistake and puts the gear shift lever into reverse with the rotary still in the lower position, the rotary will automatically raise the position control lever using the rotation of the safety motor. It was no longer possible to cause damage to the body.

Second, even when the operator noticed this mistake and returned the gear shift lever to its original position, the position control lever 4 remained rotated in the upward direction and did not return automatically. , it is necessary to rotate the position control lever 4 in the lowering direction, and it is possible to prevent personal injury when the rotary is lowered due to sudden lowering of the raised rotary.

[Brief explanation of the drawing]

Fig. 1 is a control block diagram of the depth control device with a safety device of the present invention, Fig. 2 is a left side view of the hydraulic case showing the control motor section, and Fig. 3 is a right side view of the hydraulic case showing the control lever section. 4 are bottom views of the hydraulic case showing the control lever portion. 4...Position control lever, 8...
Gear shift lever, 12... Control valve, 19
... Back switch, 60 ... Safety motor, 6
1...Screw body, 62...Abutting body.

Claims (1)

[Scope of utility model registration request] Electric automatic depth control mechanism,
In addition to providing a mechanical manual position control mechanism, a back switch 19 is provided at the reverse position of the gear shift lever 8, and a screw body 61 that is moved back and forth by a safety motor 60 can be brought into contact with the position control lever 4. 60 is
Back switch 1 is activated by reverse operation of gear shift lever 8.
When switch 9 is turned ON, it rotates in the normal direction, moves the screw body 61, rotates the position control lever 4 to the highest position, and turns the position control switch 1
8 to OFF to stop the depth control automatic mode, and when the position control lever 4 contacts the position control switch 18, the safety motor 60 rotates in the reverse direction, and the screw body 61 prevents the position control lever 4 from lowering from then on. When retracting to a position where operation is free and lowering the rotary tiller again, the position control lever 4 is configured to require manual rotation in the lowering direction by turning on the position control switch 18. A safety device for rotary tillage equipment featuring: