JPH0132498Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention connects a ground work device to the traveling aircraft via a hydraulic actuator so that it can be driven up and down, and the operating shaft for the control valve of the hydraulic actuator can be rotated outward from the case. A valve operating arm is provided with a spring that protrudes and urges the protruding operating shaft to rotate to one side, and is integrally and rotatably attached to the protruding operating shaft; In addition to linking the link pivotally connected to the level setting lever,
A swinging ground sensor for detecting the ground level of the working device is connected to the link via a push-pull wire, and the swinging of the sensor switches the control valve to adjust the ground level of the working device. The present invention relates to a lift control mechanism for a ground work vehicle configured to maintain the level within a set range.

In the above device, the operating force associated with the displacement of the sensor is transmitted to the protruding operating shaft via the link and the valve operating arm, and the operating shaft is constantly subjected to a force in a specific direction, which causes The protruding end of the operating shaft was distorted and had to be replaced at an appropriate time.

However, conventionally, one end of the protruding operating shaft was connected to the control valve's operating system within the case, and when replacing the operating shaft, the case had to be disassembled and the shaft had to be inserted into and removed from the case. Replacing the shaft had become time-consuming.

In view of the above points, it is an object of the present invention to make it possible to easily replace the operating shaft and to make effective use of the configuration for this purpose so that the spring can be mounted at a low cost.

In order to achieve the above object, the present invention provides an elevating control mechanism for a ground work vehicle as described above, in which an extended operating shaft is connected and separated outside the case to a shaft portion on the case side to constitute the protruding operating shaft. The valve operating arm is rotatably attached to the extended operating shaft, and the fitting boss member is connected to the case-side shaft portion or one end of the extended operating shaft. A set bolt for adjusting the relative phase between the case side shaft portion and the extension operation shaft is fixedly screwed in via a lock nut, and a set bolt of the spring is provided between the lock nut and the fitting boss member. It is characterized by having a bracket attached to connect one end side.

In other words, the protruding outer end of the operating shaft, which is prone to deformation, is constructed with an extended operating shaft, and the extended operating shaft is connected to the case-side shaft portion so that it can be connected and separated outside the case. It is now possible to easily replace the extended operating shaft without having to insert or remove the operating shaft.

Moreover, the lock nut of the set bolt used for connection fixation and phase alignment is effectively used, and the bracket for spring attachment is attached even when the connection is fixed by the lock nut, so when the bracket is attached separately, it is easy to attach the bracket to the operating shaft. In order to secure the length for the operation, the operating shaft becomes long, and a connecting device such as a pin is required to connect it to the operating shaft so that it can rotate freely. This eliminates the need for tools and makes it possible to install springs at low cost.

Hereinafter, embodiments of the present invention will be described in detail with reference to illustrative drawings.

A three-point link device 3 consisting of a top link 1 and a pair of left and right lower links 2 is provided at the rear of the traveling aircraft.
The rotary tilling device 4 is connected via the
Driven by a single-acting hydraulic cylinder 5 Lift arms 6, 6 that can swing vertically and left and right lower rings 2, 2
are connected via lift rods 7 and 8 to form a riding type cultivator.

The single-acting cylinder 5 has a transmission case 9.
A control valve 11 for the cylinder 5 is installed in the lower part of the cover case 10.

As shown in FIG. 2, a spool operating arm 13 is pivotally connected to the end of the spool 12 of the control valve 11 so as to be rotatable around a vertical axis P, and a lever shaft is provided on either the left or right side of the cover case 10. 1
4, and an operating shaft 15 is provided on the other hand in a state that the lever shaft 14 and the lift arm 6,
6 is interlocked and connected via a feedback rod 16, and the protruding operating shaft 1 is linked to a position lever 17, a plowing depth setting lever 18 as a ground level setting lever, or a ground sensor 19.
5, the cylinder 5 is actuated and the lift arm 6 is raised and lowered, and the lever shaft 14 is rotated to the neutral return side of the control valve 11.
The feedback control mechanism 20 is configured to stop the tilling device 4 at a height corresponding to each rotational phase of the protruding operating shaft 15.

The protruding operation shaft 15 has a case side shaft portion 15a.
A boss member 21 connected to the end of the extended operation shaft 15b is screwed and separably connected, and is fixed in phase with a set bolt 22 attached to the boss member 21. . Lock nut 23 of set bolt 22 and boss member 2
An angled bracket 24 is attached between the valve 11 and the cover case 10, and urges the protruding operating shaft 15 to rotate the valve 11 toward the lowering operation side of the tilling device 4. A tension spring 25, which is an example of a bullet, is tensioned.

As shown in FIG. 2, a valve operating arm 26 is attached to the extended operating shaft 15b so as to be able to rotate integrally with the extended operating shaft 15b, and a cylindrical support member is provided with a first fixing plate 27a connected to one end thereof. 28 is loosely fitted.

The cylindrical support member 28 includes a first friction plate 29a,
The mounting arm 18a of the plowing depth setting lever 18, the second friction plate 29b, and the second and third fixing plates 27b, 2
7c, the third friction plate 29c, the mounting arm 17a of the position lever 17, the fourth friction plate 29d, and the fourth fixing plate 27d are loosely fitted in that order, and a fixing plate is attached to the mounting arms 17a, 18a. A compression coil spring 30 is attached as a spring that applies frictional force.

At the end of the extension operation shaft 15b on the boss member 21 side, a cylindrical boss 32 connected to the support member 31 is loosely fitted, and the support member 31 is integrally attached to the side surface of the right axle case 33, Further, a rotation prevention member 34 is protruded from the support member 31 in a state parallel to the protruding operation shaft 15, and the rotation prevention member 34 is connected to the first to fourth fixing plates 27.
a, 27b, 27c, 27d, and the first to fourth fixing plates 27a, 27
The rotation prevention member 34 is used not only to prevent rotation of the shafts b, 27c, and 27d, but also to reinforce and support the operating shaft 15 in cooperation with the cylindrical boss 32.

A bracket 35 is connected to the mounting arm 18a of the plowing depth setting lever 18, and a link 36 is pivotally supported on the tip side of the bracket 35 so as to come into contact with the valve operating arm 26 when the bracket 35 swings. The link 36 and the ground sensor 19 are connected via a push-pull wire 37, an intermediate link 39 pivotally supported by a rotary case 38, and a telescopic rod 40, and are used to raise and lower the tiller 4 from the ground. Due to the accompanying vertical movement of the ground sensor 19,
The tilling device 4 is lowered by operating the valve 11 by swinging the valve operating arm 26 due to the biasing force of the tension spring 25, and on the other hand, the valve operating arm 2 is moved against the biasing force of the tension spring 2.
The tillage device 4 is operated by operating the valve 11 by the rocking of the tiller 6.
The lifting control mechanism is configured to automatically maintain the plowing depth at the ground contact level set by the plowing depth setting lever 18.

Mounting arm 17a of the position lever 17
, the contact rod 4 is inserted in a direction parallel to the protruding operating shaft 15.
1 is provided in a protruding manner, and by bringing its contact rod 41 into contact with the valve operating arm 26, the maximum lowering position of the tilling device 4 with respect to the traveling machine body is set.

A metal fitting 42 is connected to the end of the inner wire 37a of the push-pull wire 37.
A pin 44 protruding from the link 36 is fitted into and connected to the elongated hole 43 formed in the link 36, and the longitudinal wire side of the elongated hole 43, which serves as a wire end, is connected to the pin 44 as an abutting portion. The end is brought into contact with the pin 44, and as the tilling device 4 descends relative to the ground, the ground sensor 19 swings upward, and this is used as an operating force to forcibly press the valve operating arm 26 via the link 36. The tilling device 4 is then raised to a set ground level.

The tilling depth setting lever 18 is provided so that even if the tilling device 4 is levitated above the ground and the ground sensor 19 detects the highest ground level when the position lever 17 is set at a predetermined height at which tilling is normally performed. In this state, as shown in A and B of FIG. 5, by swinging the plowing depth setting lever 18 to the shallowest setting side, the pin 44 becomes fixed, and the link 36 is forced around the pin 44. The valve operating arm 26 is moved to the maximum position (fifth position) that can be operated by the position lever 17.
It is configured so that it can be operated to a position close to the position shown by the two-dot chain line _L1 in the figure. Therefore, for example,
In the plowing work, the tilling device 4 for plowing,
When suspending it from the traveling machine so that it is located close to the mud surface, set the position lever 17 to the intermediate plowing depth position to prevent the tilling device 4 from lowering beyond the setting for the machine during tilling work. When carrying out a ground levitation operation of the tilling device 4 for turning on a headland, the tilling device 4 is raised to an unnecessarily high position while the position lever 17 is maintained at the set position without swinging. This can be done by swinging the plowing depth setting lever 18 without raising the plowing depth setting lever 4 above the ground. It goes without saying that at this time, by operating the position lever 17, the tilling device 4 can be levitated above the ground.

In addition, for example, when performing so-called floating work in which the ground level of the tiller 4 is maintained constant by attaching a ground-contact tail wheel, the position lever 17 and the tiller are adjusted as shown in Fig. 6A. It is sufficient to set all of the depth setting levers 18 to the deepest position, and to perform automatic tilling depth control using the sensor 19 while preventing the tilling device 4 from lowering the traveling machine body beyond the setting, the method shown in FIG. As shown in (b), the plowing depth setting lever 18 may be set to a shallower side than the position set by the position lever 17.

In the support member 31, at a predetermined location,
A holder 4 that holds the end of the outer wire 37b is attached so as to be rotatable around an axis parallel to the operating shaft 15, and a stopper 46 that abuts and prevents the holder 4 from rotating at a predetermined position is provided. When the tilling device 4 rises and the outer wire 37b hangs down due to its own weight, it is configured to prevent the inner wire 37a on the link 36 side from buckling on the rising side due to the hanging down.

Further, in order to determine the position of the holder 45 in the support member 31, the holder 45 is
Ribs 47, 47 are provided to increase the strength of the mounting portion.

The case side shaft portion 15a is connected to the cover case 1.
0 through an O-ring 48 in a sealed state, and the cylindrical boss 32
is configured to have a relatively small length in the axial direction of the cylinder, and a recess 49 is formed near the location where the cylindrical boss 32 of the support member 31 is connected, and the boss 32
The continuous portion of the O-ring 48 is configured to have a lower rigidity than the mounting portion of the holder 45 so as to allow bending deformation in three-dimensional directions, and allow macroscopic sliding movement of the protruding operating shaft 15. It is configured to locally concentrate the load on a portion of the circumferential direction of the bearing to prevent premature wear and tear.

One of the lift rods 7 and 8 is a double-acting hydraulic cylinder (hereinafter referred to as the lift rod cylinder 8), and a control valve for the lift rod cylinder 8 is a solenoid valve 50.

A tilt sensor 51 having a spirit level structure using a float is mounted on the rotary case 38, and proximity switches 5 are attached to each of the left and right ends of the tilt sensor 51.
2 and 52, it is configured to detect whether the tilling device 4 is tilted in the left or right direction of the vehicle body.

The proximity switches 52, 52 are connected to a control circuit 53, and the solenoid valve 5 is connected to the control circuit 53.
When the proximity switches 52, 52 detect the inclination, the corresponding solenoids 54, 54 are energized to extend or shorten the cylinder 8, regardless of the left and right inclination of the vehicle body. A horizontal control mechanism 55 is configured to automatically maintain the tilling device 4 in a horizontal or nearly horizontal position.

As shown in FIG. 8, a switch tube 56 is attached to the cylinder body 8a of the lift rod cylinder 8.
is attached to the cylinder rod 8b, and a switch rod 57 is attached to the cylinder rod 8b, and the tube 5 is attached to the cylinder rod 8b.
A normally closed switch 58 and a normally open switch 59 are provided at predetermined locations within the lift rod 6 and close to each other, and the lift rod 7 is configured to have the same length as the other lift rod 7 when both switches 58 and 59 are closed. ing.

A switch operating piece 60 is attached to a predetermined location near the swing axis of the position lever 17, and the limit switch is set such that the operating piece 60 operates when the position lever 17 is operated to the maximum raised position. 61 is provided, and a lever detection switch 61 and both switches 58,
59 is connected to the control circuit 53, and as the tilling device 4 is raised by operating the position lever 17 to the maximum raised position, such as when turning on a headland, the lever detection switch 61 is closed, and both switches 58, 59
The parallel return control mechanism 62 is configured so that the tilling device 4 is automatically raised and stopped until both of the tillers are in a closed state, that is, until it is in a position parallel to the traveling vehicle body, and the weight balance is maintained. It is in good condition and is constructed so that it can be turned safely without fear of tipping over.

The limit switch 61 is housed in a switch box 63, as shown in FIG. The limit switch 61 is configured to prevent damage to the limit switch 61 by preventing it from coming into contact with the limit switch 61.

In the figure, 65 indicates a switch for manual lifting/lowering operation, and 66 indicates a manual/automatic changeover switch.

Note that a limit switch may be connected in parallel with the limit switch 61 described above, and the limit switch may be configured so that the parallel return control mechanism 62 is activated even when the plowing depth setting lever 18 is swung upward to the maximum raising side. .

The present invention is a lifting control mechanism for various ground work vehicles equipped with various work devices 4 such as a cutting height control mechanism of a combine harvester, a planting depth constant mechanism of a riding rice transplanter, etc., such as a reaping section and a seedling planting device. Applicable to

[Brief explanation of drawings]

The drawings show an embodiment of the elevation control mechanism for a ground work vehicle according to the present invention, in which Fig. 1 is a side view of the main parts of the riding cultivator, Fig. 2 is an exploded perspective view of the valve operating section, and Fig. 3 is an exploded perspective view of the valve operating section. Fig. 4 is a perspective view showing the control mechanism, Fig. 4 is a sectional view of the main part, Fig. 5 is an explanatory diagram of the operation, A is a side view showing the state in which the ground sensor has detected the highest ground level, and B is the plowing depth. A side view showing a state in which the setting lever is forcibly raised, and FIG. 6 is also an explanatory diagram of the operation.
A is a side view showing the floating state, B is a side view showing the automatic plowing depth control state, Fig. 7 is a block diagram showing the control mechanism, Fig. 8 is a sectional view of the lift rod cylinder, and Fig. 9 is a switch. FIG. 10 is a perspective view of the attachment part and a partially cutaway plan view of the main part. 4...Ground work device, 5...Hydraulic actuator, 10...Case, 11...Control valve, 15...Protruding operation shaft, 15a...Case side shaft portion, 15b...Extension operation shaft, 18...Ground Level setting lever, 19...Ground sensor, 21...Boss member, 22...Set bolt, 23...Lock nut, 24...Bracket, 25...Spring, 26...Valve operating arm, 36...Link, 37... ...Wire.

Claims (1)

[Scope of utility model registration request] A ground work device 4 is connected to the traveling aircraft via a hydraulic actuator 5 so as to be able to be driven up and down, and an operating shaft 15 for the control valve 11 of the hydraulic actuator 5 is rotatably protruded outward from the case 10. The protruding operating shaft 15 is provided with a spring 25 that urges it to rotate to one side, the valve operating arm 26 is rotatably attached to the protruding operating shaft 15, and the ground level is swingable and fixed. A link 36 pivotally connected to the setting lever 18 is linked, and a rocking ground sensor 19 for detecting the ground level of the working device 4 is linked via a push-pull wire 37, and the sensor 19 The elevation control mechanism for a ground work vehicle is configured to maintain the ground level of the work device 4 within a set range by switching the control valve 11 by the rocking of the work device 4, and the projecting operation shaft 15 is configured to control the elevation of the ground work vehicle. In this case, an extension operating shaft 15b is fitted and connected to the shaft portion 15a on the case 10 side outside the case 10 so that the extension operation shaft 15b can be freely connected and separated, and the valve operating arm 26 is connected to the extension operation shaft 15b.
The case-side shaft portion 15a and the extension operation shaft 15b are attached to a fitting boss member 21 that is integrally rotatably attached and connected to one end of the case-side shaft portion 15a or the extension operation shaft 15b. A set bolt 22 for adjusting the relative phase of the fitting boss member 2 is fixedly screwed through a lock nut 23, and the lock nut 23 and the fitting boss member 2
1, a lifting control mechanism for a ground work vehicle is provided with a bracket 24 for connecting one end of the spring 25.