JPH045571Y2 - - Google Patents

Description

[Detailed description of the invention] (Technical field) This invention is designed to use an agricultural loader to load goods on the ground into high places by placing the attachment in the scooping starting position and touching the ground, then plunging into the goods on the ground. After that, first swing the attachment from the scoop-in position to the scoop-completed position, then swing the arm up by a predetermined angle, and finally swing the attachment toward the dump side while swinging the arm up. It belongs to the technical field of devices that perform leveling (keeping the top surface of an attachment level).

The present invention relates to a device in the above-mentioned technical field having, for example, the structure shown in FIGS. 1 to 5 as its prerequisite structure.

That is, an arm 2 is pivotally supported to the base frame 1 of the agricultural loader 1 by an arm cylinder 3 so that it can be driven up and down, and an attachment 4 is pivoted at the tip of the arm 2 by an attachment cylinder 5 so that it can be driven to swing in a dump/scraper manner. The control tool 7 supports the direction switching valve 6 of the arm cylinder 3.
The directional control valve 8 of the attachment cylinder 5 can be switched between the neutral position d, the raised position b, and the lowered position c using the control tool 7.
and the dump position f, and the control tool 7
From the downward squeezing state _H1 in which the arm 2 is lowered and the attachment 4 is in the scooping posture, the attachment 4 is swung to the scooping side by a predetermined angle θ ₁ to reach the scooping completion posture _H2 , and then
After arm 2 is raised by a predetermined angle θ ₂ to state H ₃ , attachment 4 is raised while arm 2 is raised.
The present invention relates to a device configured to be operated to a leveling rising state _H4 in which the vehicle is swung toward the dump side f for leveling.

(Prior Art) Conventionally, as shown in FIG. 2, the operator on the agricultural tractor manually switches the control tool 7 intuitively as appropriate while looking at the attachment 4. However, the following drawbacks occurred.

B. The above series of operations is performed manually and intuitively, so there are large errors due to variations in the operation, and the leveling of attachment 4 becomes incorrect, causing a large amount of the scooped cargo to fall out on the way up, resulting in poor work efficiency and surrounding surroundings. defile the

(b) In order to reduce spillage of cargo, the operator must operate the operating tool 7 slowly and carefully, which takes time, reduces work efficiency, and causes fatigue for the operator.

In order to eliminate such drawbacks, the present inventor first came up with the idea shown in FIG. 3.

That is, by simply operating the control tool 7 to the position where the rake leveling is raised, the attachment is activated via the automatic control device J by a combination of the detection operations of the rake completion attitude detection limit switch _L1 and the arm predetermined angle rise detection limit switch _L2 . Automatic directional control valve 18 for automatic directional control valve 18 and automatic directional control valve 19 for arm to perform a series of operations such as scooping the attachment alone, raising the arm alone, and leveling by raising the arm and dumping the attachment. I thought about it.

However, in this case, the attachment automatic directional control valve 18 and the arm automatic directional control valve 19 must be added, and the piping of the hydraulic circuit becomes complicated and expensive.

(Purpose of the present invention) The present invention eliminates the above-mentioned drawbacks, allows a series of operations of scooping, raising, and leveling the attachment to be performed automatically, accurately, and quickly, and also simplifies the structure. With the goal.

(Structure of the present invention) As a means for achieving this object, the present invention adds the following characteristic structure to the above-mentioned premise structure, as shown in FIGS. 4 to 8, for example.

In other words, the attachment 4 is in the downward squeeze state.
A rake completion position detector L ₁ that detects swinging from H ₁ to rake completion position H ₂ is provided between the relative movement section between attachment 4 and arm 2, and arm 2 is in the downward rake-in state H ₁ Arm predetermined angle rise detector L ₂ that detects that the arm has risen by a predetermined angle θ ₂ from
is provided between the relative movement part between the arm 2 and the base frame 1, and when the operating tool 7 is operated from the downward scooping state _H1 to the scooping/leveling raising position b, e°, both of the above detections are performed. Based on the undetected movements of the devices L ₁ and L ₂ , the arm directional control valve 6 is controlled to the neutral position a, and the attachment directional control valve 8 is controlled to the scoop position e, keeping the arm 2 stopped at the lowered position. The attachment cylinder 5 swings the attachment 4, and the attachment 4 swings to the swing completion position H ₂ and detects and operates the sweep completion position detector L _1. Based on this, the attachment directional control valve 8 is activated. Switch the arm directional control valve 6 to the raised position b in the neutral position d, and swing the arm 2 upward with the arm cylinder while fixing the attachment 4 in the scooping completion posture _H2 .
Based on the fact that the arm 2 rises by a predetermined angle θ ₂ from the lowered position and the arm predetermined angle rise detector L ₂ is detected and activated, the arm directional control valve 6 is maintained at the raised position b, and the attachment directional control valve 8 is is switched to the dump position f, and while the arm cylinder 3 further swings the arm 2 upward, the attachment cylinder 5 levels the attachment 4.

(Effects) The present invention has the following effects due to this structure.

(a) With just one operation of the control tool to the rake/leveling raise position, the series of operations of rake, raise, and leveling raise of the attachment is performed based on the detection and command operation of the rake completion attitude detector and the arm predetermined angle rise detector. This can be done accurately and prevents the attachment leveling from going awry and a large amount of the scooped-up load spilling out on the way up.
Not only can you increase your work efficiency, but you can also avoid polluting the surrounding area.

(b) Since the above series of operations are performed automatically and rapidly, the work efficiency can be improved from this point of view as well, and the operator does not get tired because he only needs to operate one operating tool.

The above series of operations is performed by controlling the attachment direction switching valve and the arm direction switching valve based on the detection and command operation of the H rake completion attitude detector and the arm predetermined angle rise detector, so that the above sequence of operations is performed as shown in Fig. 2. The automatic directional switching valve for the attachment and the automatic directional switching valve for the arm required in the example of the invention can be omitted, and the hydraulic piping can also be simplified accordingly, making it possible to implement the system at low cost.

Moreover, even when the present device is retrofitted to an existing agricultural loader, there is no need to modify the hydraulic circuits of the attachment cylinder and the arm cylinder, so it can be retrofitted easily and inexpensively.

In implementing the present invention, it is possible to embody it as follows.

That is, the arm directional switching valve 6 is constituted by a solenoid valve, and is operated to the neutral position a by the neutral springs 10, 10, to the ascending position b by the ascending solenoid 11, and to the descending position c by the descending solenoid 12. The attachment directional switching valve 8 is configured as a solenoid valve, the neutral springs 10', 10' are used to set the neutral position d, the rake solenoid 11' is set to the rake position e, and the dump solenoid 12' is set to the rake position e. The detectors L ₁ and L ₂ are each configured as a limit switch, and the operating tool 7 is moved from the downward scooping state H ₁ to the scoop leveling rising positions b and e°. In the operated state, based on the undetected operation of both limit switches L ₁ and L ₂ , power supply to the lifting solenoid 11 is stopped, power is supplied to the rake solenoid 11 ′, and the rake completion attitude detection limit switch L ₁ Based on the detection operation of both limit switches _L1 and _L2 , the power supply to the rake solenoid 11' is stopped, and power is supplied to the raising solenoid 11. It is conceivable that the dumping solenoid 12' be supplied with power while the dumping solenoid 12' is being operated.

In this case, each neutral spring and each solenoid of each directional valve can be used as they are as a structure for switching the valve position of each directional valve to perform the above series of operations, and each limit switch is electrically connected to each solenoid. The structure is extremely simple and can be implemented at low cost.

(Example) The scoop raising posture detection limit switch _L1 is
As shown in FIG. 4, this is turned on and off using a cam 21. This limit switch _L1 is rotatably fixed to a bracket 25 of the arm 2 via a support shaft 23 of an attachment link 22 and a set screw 24, and a cam 21 is fixed to the attachment link 22. Then, the limit switch _L1 is set so that the relative angle between the arm 2 and the attachment 4 is in a predetermined downward squeezing state.
It is provided so as to detect that the angle θ ₁ corresponding to when the scoop is raised from H ₁ to the scoop completion posture H ₂ has been reached.

On the other hand, the arm 2 moves from the scoop completion posture H ₂ to the predetermined position.
In order to detect that the corresponding angle θ ₂ has been reached when the arm is raised to the H ₃ position, a limit switch L ₂ for detecting the rise of the arm at a predetermined angle is placed between the base frame 1 and the arm 2, for example, on the lifting cylinder. It is provided on the shaft support 15 of No. 3. Of course, this limit switch L ₂
may be provided on the shaft support 16 of the arm 2.

Fig. 5 is a schematic diagram showing an embodiment of the present invention, Fig. 6 is a circuit diagram of the control device indicated by J' in Fig. 5, Fig. 7 is its time chart, and Fig. 8 is a control lever control. It is an explanatory diagram.

The control lever 7 is selectively operated to raise the arm b° and lower c°, and to move the attachment 4 to the scoop e° and dump f° positions (Fig. 8).
At this time, in response to the above-mentioned maneuver, the arm raise switch B, lower switch C, attachment switch E, and dump switch F in the control device J' are selectively turned on to raise and lower the arm, respectively.
The individual scoop and dump operations of the attachment are still performed as before.

The functions of the detectors L ₁ and L ₂ in a series of driving operations from the next lower scooping position H ₁ to the leveling raising states H ₄ and H ₅ will be sequentially explained.

In the scooping position _H1 , move the operating lever 7 to raise the arm and attach the attachment screw (Fig. 8b,
maneuver to position e°). Then, switches B and E are turned on, but the arm raising circuit is turned on by switch E.
is turned off, so the lift solenoid 11 is not activated and the arm directional control valve 6 is maintained at the neutral position a.
On the other hand, the squeezing solenoid 11' is actuated to scoop up the attachment 4.

Next, attachment 4 is in the sweep completion position.
When H ₂ is reached, the rake completion attitude detection limit switch L ₁ is detected and activated, but in conjunction with this, relay R is activated to turn on switch SB and SE.
Turn off, turn on SF, and turn on self-holding switch r. At this time, the arm lift circuit is conducted, the lift solenoid 11 is activated, the arm directional control valve 6 is set to the lift position b, and the arm 2 is lifted, the rake circuit is turned off, and the attachment 4 is placed in the rake completion position H. ₂ (that is, the relative angle of the attachment 4 to the arm 2 is maintained), and the arm 2 is rotated upward about the pivot point 16 to reach a leveling position _H3 in a substantially horizontal state. Next, the arm predetermined angle rise detector _L2 detects that the leveling position _H3 has been reached,
Along with this, the dump circuit is turned on and the dump solenoid 12' is operated to dump the attachment 4, but the arm 2 continues to rise and the attachment 4 is leveled up _H4 in a substantially horizontal state and reaches the top _H5 . configured to reach and stop.
In addition, in order to maintain the raised leveling state (H ₃ to H ₅ ), a hydraulic circuit may be provided as appropriate when the arm lift cylinder 3 and the attachment squee dump cylinder 5 are operated simultaneously.

[Brief explanation of drawings]

Fig. 1 is a schematic side view showing the operation mode of the agricultural loader, Fig. 2 is a diagram of the operating drive system of the agricultural loader, Fig. 3 is a system diagram similar to Fig. 2 based on the idea before this application, and Fig. 4 is a detection switch. Fig. 5 is an exploded perspective view showing the installation mode of the agricultural loader according to the present invention, Fig. 6 is a control circuit of the control device J', and Fig.
The figure shows the time chart, and FIG. 8 shows the operation explanatory diagram of the operating lever. 1... Base frame, 2... Arm, 3... Arm lifting cylinder, 4... Attachment, 5... Attachment cylinder, 6... Arm lifting switching valve,
7... Operation lever, 8... Sake/dump switching valve, 10, 10'... Neutral return spring, 11... Arm lift solenoid, 11'... Solenoid for scoop, 12... Arm lowering solenoid, 12' …
... Solenoid for dump, L ₁ ... Limit switch for detecting scoop completion attitude, L ₂ ... Limit switch for detecting arm rise at a predetermined angle.

Claims (1)

[Claims for Utility Model Registration] 1. An arm 2 is pivotally supported on the base frame 1 of an agricultural loader 1 by an arm cylinder 3 so that it can be driven vertically, and an attachment 4 is attached to the tip of the arm 2 by an attachment cylinder 5. The directional control valve 6 of the arm cylinder 3 is moved to a neutral position a, a raised position b, and a lowered position c using a control tool 7.
The direction switching valve 8 of the attachment cylinder 5 can be switched between the neutral position d, the rake position e, and the dump position f using the control tool 7, and by operating the control tool 7, the arm 2 can be moved. From the descending squeezing state H ₁ in which the attachment 4 is lowered to the scooping posture, the attachment 4 is swung toward the scooping side by a predetermined angle θ ₁ to reach the scooping completion posture H ₂ , and then the arm 2 is raised by a predetermined angle θ ₂ Leveling raised state _H4 in which leveling is achieved by swinging _the attachment 4 to the dump side f while raising the arm 2.
In the rake leveling raising device after rake-in of the attachment of an agricultural loader configured to operate as follows, the rake-completed attitude detection detects that the attachment 4 has swung from the downward rake-in state _H1 to the rake-completed attitude _H2 . container L ₁ ,
Provided between the relative movement part between the attachment 4 and the arm 2, and the arm 2 is in a downward squeezing state.
An arm predetermined angle rise detector L ₂ that detects that the arm has risen by a predetermined angle θ ₂ from H ₁ is provided between the relative movement part between the arm 2 and the base frame 1, and the control tool 7 is installed between the arm 2 and the base frame ₁ in the relative movement part. When the rake is operated to the rake leveling raised position b, e°,
Based on the undetected operation of both the detectors L ₁ and L ₂ ,
The arm directional control valve 6 is controlled to the neutral position a and the attachment directional control valve 8 is controlled to the rake position e, and the attachment cylinder 5 swings the attachment 4 while the arm 2 is stopped at the lowered position. Based on the fact that the attachment 4 is swung to the rake completion position H ₂ and the rake completion position detector L ₁ is detected and activated, the attachment directional control valve 8 is moved to the neutral position d, and the arm directional control valve 6 is raised. Switch to position b,
While the attachment 4 is fixed in the rake completion posture H ₂ , the arm 2 is swung upward by the arm cylinder 3, and the arm 2 rises by a predetermined angle θ ₂ from the lowered position, and the arm predetermined angle rise detector L ₂ is detected and activated. On the basis of 5. A raised position of the rake leveling after the rake of the attachment of the agricultural loader, characterized in that the attachment 4 is leveled at the lower position. 2. The arm directional switching valve 6 is constituted by a solenoid valve, and is operated to a neutral position a by neutral springs 10, 10 to a raised position b by a rising solenoid 11, and to a lowered position c by a descending solenoid 12. The attachment directional control valve 8 is constructed of a solenoid valve, and the neutral springs 10', 1
At neutral position d at 0', solenoid 1 for squeezing
1' to rake position e, dump solenoid 1
2', the detectors L ₁ and L ₂ are configured with limit switches, and the operating tool 7 is moved from the downward scooping state H ₁ to the scoop leveling raise b, e°. When the limit switches L ₁ and L ₂ are operated in the position shown in FIG.
Supply power to the scoop solenoid 11',
Based on the detection operation of only the rake completion attitude detection limit switch _L1 , the rake solenoid 1
1', power is supplied to the lift solenoid 11, and based on the detection operation of both limit switches _L1 and _L2 , power is supplied to the lift solenoid 11 while supplying power to the dump solenoid 12'. 1. A rake leveling device for raising an attachment of an agricultural loader according to claim 1, which is configured to supply power to an agricultural loader.