DE10241474B4 - Device for controlling the throwing distance of scattered products - Google Patents

Abstract

Device for controlling the throw distance of scattered products, primarily for centrifugal fertilizer spreaders,
comprising two centrifugal discs, each driven by its own hydraulic motor, each hydraulic motor is associated with a proportional 3-way flow control valve, characterized in that the speed of the centrifugal discs individually and independently adjustable and / or adjustable, wherein the return of the first controlled hydraulic motor
and the residual oil flow of the associated proportional 3-way flow control valve is supplied as a total oil flow to the input of the second proportional 3-way flow control valve for adjusting and / or regulating the speed of the second hydraulic motor.

Description

Technical area

The The invention relates to a device for controlling the throwing distance of scattered products, with priority for Centrifugal fertilizer spreader, which has two centrifugal discs, each with its own Hydraulic motor to be driven, with each hydraulic motor Proportional 3-way flow control valve assigned.

she owns relevance for Vehicles, especially for Agricultural vehicles. It can be used on centrifugal fertilizer spreaders with two spreading discs at least for border, boundary and normal scattering are used. It will the spreading material by horizontally rotating spreading discs with throwing blades distributed. The speed of circulation of the lenses influences the throwing distance with which the scattering products can be spread.

At the Spreading fertilizers there is a need to distribute these evenly on the intended area. It is between the normal scattering and border and border spreading distinguished.

The Randstreuen allows an overrun the field boundaries for uniform distribution of the Grit. When boundary bordering, however, the grit may not over specified Borders to adjacent areas. Adjacent areas can Paths, waters or similar be. Even in the case of border spreading is on an even distribution of the material to be spread within a defined surface area. The is called, that just when boundary spreading the edge of the scattering curve of the border area must fall steeply.

State of the art and from it resulting problems

It are different solutions for mounted centrifugal spreader known that the edge and / or border spreading by the position certain strips, marginal / border discs, different task points, Rand / Grenzstreuschirme and also different speeds of the the field boundary facing lens in conjunction with the change realize the task.

All these solutions go from granular fertilizers and relatively small feed quantities. The required power, especially for Hydraulic individual drives of the spreading discs, can directly be removed from the hydraulics of the respective tractor vehicle.

So is in the DE 197 56 722 A1 described a circuit variant in which two parallel hydraulic motors each a proportional throttle valve has been presented in order to vary the previously split oil flow of the tractor hydraulics for a speed adjustment of the hydraulic motors can. The unneeded residual oil and the returns of the hydraulic motors are completely fed to the return of the system.

In the DE 44 28 722 A1 A speed adjustment circuit will be displayed by two series-connected hydraulic motors. Due to the additional addition of the residual oil flow of the flow control valve to the input of the second hydraulic motor, the speed of the two hydraulic motors can not be adjusted individually and independently. The speed of the second hydraulic motor changes to the speed of the first hydraulic motor upon adjustment of the flow control valve in the ratio of the provided residual oil flow.

These solutions are not suitable to be drawn large area spreader with a wide Spectrum of auszubringendem grit and a very large application rate range to use. In practice, need not only grained fertilizer reliably "border-scattered" can, but also all other scattered products with sometimes very high Feed quantities and this with different consistency of the scattered products (Basic fertilizer, Lime, compost, dried chicken droppings, Manure). Need it the lenses a drive power, which is not usually More can be fed from the tractor hydraulics.

Individually powered spreading discs are therefore with a tractor-independent hydraulic circuit equipped, its high power output from the PTO of each used Tractor refers. The confrontation with the state of the art has shown that even in the case of large area spreaders no suitable Arrangements are available that would be able to with the through the hydraulic circuit to disposal put power, scattering discs individually to control the task the boundary / edge scattering is achieved in the required manner. For the Control of the individual drives of the lenses is known in the solutions additional Hydraulic power needed.

Technical task

The technical object is to provide a device which can be used for individual and independent control of the rotational speed of lenses and thus also for the individual and independent control of the throw of auszubringenden scattering products. The control of the throwing distance of spreadable products is of particular interest, for example, in the fertilization of field interfaces and to avoid surface coverages. The circulation speed of the spreading discs must be changed in such a way that the fertilizer is not spread on adjacent areas for ecological as well as economic reasons.

The solution should also get along with the hydraulic power available on the vehicle.

Of the Driver of the vehicle should the circulation speed of the lenses adapted to the situation when carrying out the spreading work from the driver's cab out of control. Situationally adjusted means that the speed for each Grit to the actual with fertilizer Covered area must be adjustable.

By a switch should the circulation speed of the lenses immediately to the situation "sprinkle a field boundary "or" scatter a normal field range "switchable be. The speed of each diffuser should be displayed in the cab become.

The The object is achieved by a device having the features of the patent claim solved.

Presentation of the invention

In Practical experiments have shown that edge / border spreading and also a normal sprinkling with only one task point / area can be realized. Edge / border spreading can be very simple by reducing the speed of the boundary-facing lens for all fertilizer be achieved. As a rule, the distance of the border of half Working width of the fertilizer spreader in this case, a change in the quantity of grit for the "border" is not required. Otherwise, every lens with a separate path dependent Forced dosage unit can be operated.

The technical task, which is at the core, the Individual control of the spreading discs without additional hydraulic power too reach, is inventively by the realization of a series connection of controllable proportional 3-way flow control valves taking advantage of the return the first controlled hydraulic motor one of the lenses solved. Further details of the invention are the example description and to take the drawings. Hereby shows:

1 Circuit arrangement of the hydraulic motors and the flow control valves

2 Application example with an operable by the driver of a tractor arrangement

• • Hydraulikpumpe (1)
• • Proportional-3Wege-Stromregelventile (2, 3)
• • Hydraulikmotore (4, 5)
• • Restöl (6)
• • Hydraulikrücklauf (7).

The circuit consists essentially of:

• • Hydraulic pump ( 1 )
• • Proportional 3-way flow control valves ( 2 . 3 )
• • hydraulic motors ( 4 . 5 )
• • residual oil ( 6 )
• • hydraulic return ( 7 ).

Everyone Lens is assigned to a separate hydraulic motor, each by means of one of the proportional 3-way flow control valves with the to reach controlled amount of oil required a defined rotational speed becomes. The proportional 3-way flow control valves are connected in series, so that the oil return of the first engine and the residual oil of the first flow control valve for the 2nd hydraulic motor drive and its control is available. In this way, the power available through the feeding hydraulic system becomes available optimally used, and it can be dispensed with additional power supply become.

Commercial applications

• • gezogene Düngerstreuer
• • Anbaudüngerstreuer
• • Auf Grundfahrzeuge aufgebaute Düngerstreuer

The arrangement for controlling the throw of scattered products is applicable to:

• • pulled fertilizer spreaders
• • Cultivation fertilizer spreader
• • Fertilizer spreaders built on base vehicles

Furthermore the arrangement is also applicable to vehicles of winter service.

• • von Streusalz oder
• • Streusand.

Here it is suitable for. B. for spreading

• • of road salt or
• • Scattered sand.

The mentioned applications require a uniform surface distribution of the material to be spread, the avoidance of unnecessary covering areas, avoidance the spreading material load in adjacent areas, the exact adaptation The rotational speed of the lenses for a wide range of applicable scattered products.

Advantages of the invention

• • optimale Nutzung der durch das Hydrauliksystem bereitgestellten Leistung und damit Vermeidung der zusätzlichen Bereitstellung von Hydraulikleistung bei der Realisierung von unabhängig und einzeln steuerbaren Streuscheibenantrieben,
• • Anwendbarkeit der Lösung für ein breites Spektrum an Streuprodukten durch die Möglichkeit der stufenlosen Anpassung der Streuscheibenumlaufgeschwindigkeit
• • Einsetzbarkeit für Großflächendüngerstreuer mit hohem Massendurchsatz,
• • Möglichkeit des Wechselns von Grenzstreubetrieb oder Randstreubetrieb in Normalstreubetrieb durch den Fahrer des Streufahrzeuges per Knopfdruck.

The invention has the following advantages over the prior art:

• Optimal use of the power provided by the hydraulic system and thus avoiding the additional provision of hydraulic power in the realization of independently and individually controllable diffuser drives,
• • Applicability of the solution for a wide range of scattering products through the possibility of continuous adjustment of the spreading discs running speed
• • applicability for large-scale fertilizer spreaders with high mass flow rate,
• • Possibility of switching from boundary spreading operation or boundary spreading operation into normal spreading operation by the driver of the spreading vehicle by pressing a button.

example

2 shows a concrete application example of an operable by the driver of a towing vehicle arrangement for controlling the throw of scattered products.

• • Hydraulikpumpe (1)
• • Proportional-3Wege-Stromregelventile (2, 3)
• • Hydraulikmotore (4, 5)
• • Restöl (6)
• • Hydraulikrücklauf (7)
• • Generator zur Erzeugung pulsweitenmodulierter Signale, mit denen die Proportional-3Wege-Stromregelventile in ihrem Verhalten beeinflusst werden können (8)
• • μ-Prozessoreinheit (9),
• • Alphanumerischen Display zur Darstellung der Drehzahlwerte (10)
• • zwei Umschaltern, mit denen zwischen Grenz- und -Normalstreubetrieb Gewählt werden kann (11, 12) und
• • zwei Reglereinheiten, mit denen die Drehzahlen zweier Streuscheiben unabhängig von einander und für zwei Betriebsarten (Grenz- und Normalstreubetrieb) eingestellt werden können (13, 14).

In the 2 shown arrangement consists of:

• • Hydraulic pump ( 1 )
• • Proportional 3-way flow control valves ( 2 . 3 )
• • hydraulic motors ( 4 . 5 )
• • residual oil ( 6 )
• • hydraulic return ( 7 )
• • Generator for generating pulse-width modulated signals with which the behavior of the proportional 3-way flow control valves can be influenced ( 8th )
• • μ-processor unit ( 9 )
• • Alphanumeric display for displaying the speed values ( 10 )
• • two switches, with which one can choose between border and normal scattering operation ( 11 . 12 ) and
• • two control units, with which the speeds of two diffusers can be set independently of each other and for two operating modes (boundary and normal spreading) ( 13 . 14 ).

Claims (1)

Device for controlling the throw of scattering products, primarily for centrifugal fertilizer spreader, which has two centrifugal discs, each driven by its own hydraulic motor, each hydraulic motor is assigned a proportional 3-way flow control valve, characterized in that the speed of the centrifugal discs individually and independently adjustable and / or is adjustable, wherein the return of the first controlled hydraulic motor and the residual oil flow of the associated proportional 3-way flow control valve is supplied as a total oil flow to the input of the second proportional 3-way flow control valve for adjusting and / or regulating the speed of the second hydraulic motor.