WO2009134144A1 - Depth control device for a coulter - Google Patents

Depth control device for a coulter Download PDF

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Publication number
WO2009134144A1
WO2009134144A1 PCT/NO2009/000166 NO2009000166W WO2009134144A1 WO 2009134144 A1 WO2009134144 A1 WO 2009134144A1 NO 2009000166 W NO2009000166 W NO 2009000166W WO 2009134144 A1 WO2009134144 A1 WO 2009134144A1
Authority
WO
WIPO (PCT)
Prior art keywords
coulter
unit
depth wheel
pressure regulating
load
Prior art date
Application number
PCT/NO2009/000166
Other languages
French (fr)
Inventor
Kjell Vastveit
Original Assignee
Agromiljø As
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Agromiljø As filed Critical Agromiljø As
Publication of WO2009134144A1 publication Critical patent/WO2009134144A1/en

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Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01C—PLANTING; SOWING; FERTILISING
    • A01C7/00—Sowing
    • A01C7/20—Parts of seeders for conducting and depositing seed
    • A01C7/201—Mounting of the seeding tools
    • A01C7/203—Mounting of the seeding tools comprising depth regulation means
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
    • A01B63/00—Lifting or adjusting devices or arrangements for agricultural machines or implements
    • A01B63/02—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors
    • A01B63/10—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors operated by hydraulic or pneumatic means
    • A01B63/111—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors operated by hydraulic or pneumatic means regulating working depth of implements
    • A01B63/114—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors operated by hydraulic or pneumatic means regulating working depth of implements to achieve a constant working depth
    • A01B63/1145—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors operated by hydraulic or pneumatic means regulating working depth of implements to achieve a constant working depth for controlling weight transfer between implements and tractor wheels
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01C—PLANTING; SOWING; FERTILISING
    • A01C7/00—Sowing
    • A01C7/20—Parts of seeders for conducting and depositing seed
    • A01C7/201—Mounting of the seeding tools
    • A01C7/205—Mounting of the seeding tools comprising pressure regulation means

Definitions

  • the invention relates to a device for a unit for placing particles and/or fluid in a seed bed, where depth wheels provided on a bogie unit are rolling on the surface of a seed bed, and a pressure regulating actuator provided between an implement carrier and the coulter unit are arranged to be able to control the load on the depth wheels according to the load carrying capacity of the seed bed.
  • seed or fertiliser particles or fertiliser fluid in a soil, e.g. in the form of seeds or granulated fertiliser being placed in a seed bed, or fertiliser to be placed correctly relative to an existing or new plant stand being established by sowing, it is important that the coulter keeps an even depth independently of the load carrying capacity of the soil, the surface evenness and topography.
  • the purpose of keeping an even placement depth is to achieve even and optimal germination and also optimal positioning of fertiliser relative to the root system of the plants.
  • the object of the invention is to remedy or reduce at least one of the prior art drawbacks .
  • a device for a unit for placement of particles and/or fluid in a seed bed where a coulter working depth is controlled by depth wheels provided on a bogie unit equipped with a forward and a rear bogie, are rolling on the surface of a seed bed, and a pressure regulating actuator arranged between an implement carrier and the placement unit is arranged to be able to regulate the loading on the depth wheels according to the load carrying capacity of the seed bed, as a load sensor is provided at the one of the two depth wheel bogies and is arranged to be able to register a load resting on said bogie, and by signal communication to a control unit providing control signals for regulating the vertical force transfer of the pressure regulating actuator to the placement unit.
  • the invention relates to a device for regulating load transfer from an implement carrier to at least one depth wheel provided on a placement unit during the placement unit conveyance of a coulter in a seed bed, as the coulter is fixed to a frame supported by the at least one depth wheel, characterised in that a pressure regulating activator is provided between the implement carrier and the placement unit and is arranged to be able to maintain a prescribed loading in a support point for at least one of the at least one depth wheel or a depth wheel arrangement; as a weight sensor attached to the support point is in signal communicating connection with a control unit for the pressure regulating actuator.
  • At least one coulter and at least one depth wheel may form a coulter unit being vertically suspended from a main frame.
  • the coulter unit may be fastened to the main frame by means of a linkage arm, where the linkage arm is interconnected with a lifting actuator arranged to be able to turn the linkage arm about a pivot link provided in the connection between the main frame and the linkage arm.
  • Each coulter unit lifting actuator may be a double acting hydraulic cylinder.
  • All the coulter units lifting cylinders may be connected hy- draulically in parallel and connected to a hydraulic plant for thereby to effect that the loads applied to each of the forward or rear depth wheel bogies are approximately equal .
  • the pressure regulating actuator may be a hydraulic cylinder.
  • the pressure regulating hydraulic cylinder may be in fluid communication with the hydraulic plant via a pressure control valve arranged to maintain the prescribed load in the support point on receipt of a control signal from the control unit.
  • the weight sensor may be provided on the rear depth wheel bogie provided on a bogie unit, which is equipped with two depth wheel bogies mounted substantially in line in the coulter unit working direction, and the prescribed load is loaded onto the rear depth wheel bogie .
  • Fig. 1 shows a side view principle sketch of a placement unit according to the invention, where each coulter unit is provided with depth wheels arranged on bogies, and where the placement unit is shown di- rectly connected to a tractor, where a pressure regulating actuator is provided to apply a load on the placement unit;
  • Fig. 2 shows a placement unit according to the invention, where each coulter unit is provided with one depth wheel, and otherwise arranged equivalently to figure 1 ;
  • Fig. 3 shows a plan view of a section of the placement unit of figure 1, as four coulter units arranged on a main frame are shown;
  • Fig. 4 shows the placement unit in a simplified side view, where each coulter unit is provided with depth wheels arranged on bogies, and also auxiliary- equipment having a self-weight, which determines that the pressure regulating actuator is arranged to relieve the placement unit.
  • the reference numeral 1 indicates a placement unit mounted on a tractor 2. It is nevertheless self-evident to a person skilled in the art that the placement device 1 may be mounted on any implement carrier or suitable working tool, such as a towed seed drill or a towed fertiliser distributor as shown in figure 4 where an implement attachment 21 is provided for lifting and lowering of the placement unit relative to a seed bed 3 by means of per se known means, typically in the form of a hydraulic three-point linkage comprising lower link arms 211 connected to hydraulically operated lifting rods (not shown) and also a top link 212.
  • a hydraulic three-point linkage comprising lower link arms 211 connected to hydraulically operated lifting rods (not shown) and also a top link 212.
  • the placement unit 1 comprises more coulter units 12 mounted spaced side by side.
  • Each coulter unit 12 is provided with two coulters 122 mounted in a coulter frame 121 which by means (not shown) for vertical adjustment relative to a bogie unit 13, may be adjusted to provide a prescribed placement depth in the seed bed 3 for particles and/or fluid which is fed out from a container (not shown) via a feeding unit (not shown) and through a sowing pipe 123 to the coulter 122.
  • the coulter unit 12 is non-rotatable connected to the bogie unit 13, which in each end portion of a frame 131 is provided with a forward, respectively rear bogie 132, 132' .
  • Each bogie 132, 132' comprises two depth wheels 132b mounted sideways displaced relative to each other, as the depth wheels 132b are arranged to roll on the surface 31 of the seed bed 3 and compact this.
  • Each bogie 132, 132' is in a per se known way fastened to the bogie unit frame 131 by means of a bogie support 132a which is pivotal about a horizontal axis.
  • the bogie unit 13 is vertically swinging fastened to a main frame 11 by means of a linkage arm 133a, as a lower pivot linkage 133a constitutes the connection with the bogie unit frame 131, and an upper pivot linkage 133b constitutes the connection with the main frame 11.
  • a lifting actuator 133d in the form of a double acting hydraulic cylinder is via a pivot linkage connected between a mid portion of each linkage arm 133 and the main frame 11. All the hydraulic cylinders 133d are hydraulically connected in parallel and are in a fluid communicating way connected to a hydraulic plant 22 and provided with pressurised fluid reservoir, pump, and valves (not shown) via hydraulic lines A, B.
  • the rear bogie 132' is provided with a weight sensor 134 arranged at the bogie support 133.
  • the weight sensor 134 is via a sensor signal cable D connected to a control unit 135.
  • FIG. 2 shows an alternative embodiment where each coulter 12 is provided with a single depth wheel 132b fastened to the coulter frame 121.
  • the coulter frame 121 is rigidly connected to the linkage arm 133a.
  • a weight sensor 134 is provided in the depth wheel's 132b support 132c, which via the sensor signal cable D, is connected to the control unit 135 in a corresponding way to that described above.
  • the functions of the other elements are the same for the two embodiments shown.
  • a pressure regulating actuator 213 in the form of a hydraulic cylinder is provided at the implement bracket 21 and is arranged to be able to provide a vertical load component on the placement unit 1.
  • FIGS 1 and 2 are shown a situation wherein the place- ment unit 1 has a small own weight.
  • the seed bed 3 has a large carrying capacity and it is difficult to achieve a desired working depth for the coulters 12, it is necessary under such conditions to be able to transfer load to the placement unit 1 and by so doing force the coulters 12 down to the correct working depth.
  • the actuator 213 By letting the pressure regulating actuator 213 be pointing obliquely from the top top link's 212 forward portion downwardly to a fixation on the placement unit 1, the actuator 213 will, when pushing, apply a vertical downward load component to the placement unit 1 which together with the placement unit 1 own weight resulting in that the forward and the rear bogies 132, 132' (figure 1) each carry a load respectively P, P' , alternatively that the single depth wheel 132b (figure 2) carries the load P' .
  • FIG 4 is shown a situation wherein the placement unit 1 has a large own weight in that it comprises an auxiliary equipment 11a, such as a fluid distributor or a seed container.
  • auxiliary equipment 11a such as a fluid distributor or a seed container.
  • the actuator 213 By letting the pressure regulating actuator 213 be pointing obliquely from the top link's 212 rear portion downwardly to a fixation on the implement carrier 2, the actuator 213 will, when pushing, apply a vertical upward load component to the placement unit 1 which together with the placement unit ' s 1 own weight results in that the forward and the rear bogies 132, 132' (figure 1) each carry a load respectively P, P' .
  • the pressure regulating hydraulic cylinder 213 is in a fluid communicating way connected to the hydraulic plant 22 via a hydraulic line A, a pressure regulating valve 136 and a hydraulic line C. From the pressure regulating valve 136 is provided a return line to the hydraulic plant 22 via a hydraulic line B.
  • the pressure regulating valve 136 is in a signal communicat- ing way connected to the control unit 135 via a control signal line E.
  • the hydraulic pressure in the pressure regulating hydraulic cylinder 213 may be adjusted to achieve a desired load on the bogie which is provided with a load sensor, in this case the rear bogie 132' (figure 1), alternatively the single depth wheel 132b (figure 2) .
  • a load sensor in this case the rear bogie 132' (figure 1), alternatively the single depth wheel 132b (figure 2) .
  • an approximately continuous adjustment of the pressure in the pressure regulating hydraulic cylinder 213 may be performed to adjust the load on the bogie 132', alternatively the single depth wheel 132b. This is important when driving through a recession or over an elevation in the ground that the seed bed 3 extends over, as the placement unit 1 is vertically rigid connected to the implement carrier 2.
  • the load on the bogie 132' is able to be adjusted during operation for continuous adaptation to the nature of the seed bed 3.
  • Unevenness in the seed bed 3 in a direction lateral to the working direction R will cause a coulter unit 12, being on a high-lying ground, to generate a pressure increase on one piston-side in the lifting cylinder 133d.
  • This pressure is transmitted to the other lifting cylinders 133d connected in parallel, and the pressure will be evened out by all the lifting cylinders 133d being adjusted so that each coulter unit 12 provides the same wheel pressure against the seed bed 3.

Abstract

Device for regulating load transfer from an implement carrier (2) to at least one depth wheel (132b) provided on a placement unit (1) during the conveyance by the placement unit (1) of a coulter (122) in a seed bed (3), as the coulter (122) is supported by the at least one depth wheel (132b), where a pressure regulating actuator (213) is provided between the implement carrier (2) and the placement unit (1) and is arranged to maintain a prescribed load (P or P' ) in a support point (132c, 134) for at least one of the at least one depth wheels (132b) or a depth wheel arrangement (132 or 132'); as a weight sensor (134) connected with the support point (132c, 134) is in signal communicating connection with a control unit (135) for the pressure regulating actuator (213).

Description

DEPTH CONTROL DEVICE FOR A COULTER
The invention relates to a device for a unit for placing particles and/or fluid in a seed bed, where depth wheels provided on a bogie unit are rolling on the surface of a seed bed, and a pressure regulating actuator provided between an implement carrier and the coulter unit are arranged to be able to control the load on the depth wheels according to the load carrying capacity of the seed bed.
In placement of seed or fertiliser particles or fertiliser fluid in a soil, e.g. in the form of seeds or granulated fertiliser being placed in a seed bed, or fertiliser to be placed correctly relative to an existing or new plant stand being established by sowing, it is important that the coulter keeps an even depth independently of the load carrying capacity of the soil, the surface evenness and topography. The purpose of keeping an even placement depth is to achieve even and optimal germination and also optimal positioning of fertiliser relative to the root system of the plants.
The object of the invention is to remedy or reduce at least one of the prior art drawbacks .
The object is achieved by features stated in the below description and in the following claims.
There is provided a device for a unit for placement of particles and/or fluid in a seed bed, where a coulter working depth is controlled by depth wheels provided on a bogie unit equipped with a forward and a rear bogie, are rolling on the surface of a seed bed, and a pressure regulating actuator arranged between an implement carrier and the placement unit is arranged to be able to regulate the loading on the depth wheels according to the load carrying capacity of the seed bed, as a load sensor is provided at the one of the two depth wheel bogies and is arranged to be able to register a load resting on said bogie, and by signal communication to a control unit providing control signals for regulating the vertical force transfer of the pressure regulating actuator to the placement unit.
More particularly the invention relates to a device for regulating load transfer from an implement carrier to at least one depth wheel provided on a placement unit during the placement unit conveyance of a coulter in a seed bed, as the coulter is fixed to a frame supported by the at least one depth wheel, characterised in that a pressure regulating activator is provided between the implement carrier and the placement unit and is arranged to be able to maintain a prescribed loading in a support point for at least one of the at least one depth wheel or a depth wheel arrangement; as a weight sensor attached to the support point is in signal communicating connection with a control unit for the pressure regulating actuator.
At least one coulter and at least one depth wheel may form a coulter unit being vertically suspended from a main frame.
The coulter unit may be fastened to the main frame by means of a linkage arm, where the linkage arm is interconnected with a lifting actuator arranged to be able to turn the linkage arm about a pivot link provided in the connection between the main frame and the linkage arm.
Each coulter unit lifting actuator may be a double acting hydraulic cylinder.
All the coulter units lifting cylinders may be connected hy- draulically in parallel and connected to a hydraulic plant for thereby to effect that the loads applied to each of the forward or rear depth wheel bogies are approximately equal .
The pressure regulating actuator may be a hydraulic cylinder.
The pressure regulating hydraulic cylinder may be in fluid communication with the hydraulic plant via a pressure control valve arranged to maintain the prescribed load in the support point on receipt of a control signal from the control unit.
The weight sensor may be provided on the rear depth wheel bogie provided on a bogie unit, which is equipped with two depth wheel bogies mounted substantially in line in the coulter unit working direction, and the prescribed load is loaded onto the rear depth wheel bogie .
In the following is described an example of a preferred embodiment illustrated in the accompanying drawings, where:
Fig. 1 shows a side view principle sketch of a placement unit according to the invention, where each coulter unit is provided with depth wheels arranged on bogies, and where the placement unit is shown di- rectly connected to a tractor, where a pressure regulating actuator is provided to apply a load on the placement unit;
Fig. 2 shows a placement unit according to the invention, where each coulter unit is provided with one depth wheel, and otherwise arranged equivalently to figure 1 ;
Fig. 3 shows a plan view of a section of the placement unit of figure 1, as four coulter units arranged on a main frame are shown; and
Fig. 4 shows the placement unit in a simplified side view, where each coulter unit is provided with depth wheels arranged on bogies, and also auxiliary- equipment having a self-weight, which determines that the pressure regulating actuator is arranged to relieve the placement unit.
In figure 1 the reference numeral 1 indicates a placement unit mounted on a tractor 2. It is nevertheless self-evident to a person skilled in the art that the placement device 1 may be mounted on any implement carrier or suitable working tool, such as a towed seed drill or a towed fertiliser distributor as shown in figure 4 where an implement attachment 21 is provided for lifting and lowering of the placement unit relative to a seed bed 3 by means of per se known means, typically in the form of a hydraulic three-point linkage comprising lower link arms 211 connected to hydraulically operated lifting rods (not shown) and also a top link 212.
The placement unit 1 comprises more coulter units 12 mounted spaced side by side. Each coulter unit 12 is provided with two coulters 122 mounted in a coulter frame 121 which by means (not shown) for vertical adjustment relative to a bogie unit 13, may be adjusted to provide a prescribed placement depth in the seed bed 3 for particles and/or fluid which is fed out from a container (not shown) via a feeding unit (not shown) and through a sowing pipe 123 to the coulter 122. < The coulter unit 12 is non-rotatable connected to the bogie unit 13, which in each end portion of a frame 131 is provided with a forward, respectively rear bogie 132, 132' . Each bogie 132, 132' comprises two depth wheels 132b mounted sideways displaced relative to each other, as the depth wheels 132b are arranged to roll on the surface 31 of the seed bed 3 and compact this. Each bogie 132, 132' is in a per se known way fastened to the bogie unit frame 131 by means of a bogie support 132a which is pivotal about a horizontal axis.
The bogie unit 13 is vertically swinging fastened to a main frame 11 by means of a linkage arm 133a, as a lower pivot linkage 133a constitutes the connection with the bogie unit frame 131, and an upper pivot linkage 133b constitutes the connection with the main frame 11.
A lifting actuator 133d in the form of a double acting hydraulic cylinder is via a pivot linkage connected between a mid portion of each linkage arm 133 and the main frame 11. All the hydraulic cylinders 133d are hydraulically connected in parallel and are in a fluid communicating way connected to a hydraulic plant 22 and provided with pressurised fluid reservoir, pump, and valves (not shown) via hydraulic lines A, B.
The rear bogie 132' is provided with a weight sensor 134 arranged at the bogie support 133. The weight sensor 134 is via a sensor signal cable D connected to a control unit 135.
Figure 2 shows an alternative embodiment where each coulter 12 is provided with a single depth wheel 132b fastened to the coulter frame 121. The coulter frame 121 is rigidly connected to the linkage arm 133a. A weight sensor 134 is provided in the depth wheel's 132b support 132c, which via the sensor signal cable D, is connected to the control unit 135 in a corresponding way to that described above. Beyond the alloca- tion of the depth wheel arrangement 132b directly on the coulter frame 121 and the rigid connection of the coulter frame 121 to the linkage arm 133a, the functions of the other elements are the same for the two embodiments shown.
A pressure regulating actuator 213 in the form of a hydraulic cylinder is provided at the implement bracket 21 and is arranged to be able to provide a vertical load component on the placement unit 1.
In figures 1 and 2 are shown a situation wherein the place- ment unit 1 has a small own weight. When the seed bed 3 has a large carrying capacity and it is difficult to achieve a desired working depth for the coulters 12, it is necessary under such conditions to be able to transfer load to the placement unit 1 and by so doing force the coulters 12 down to the correct working depth. By letting the pressure regulating actuator 213 be pointing obliquely from the top top link's 212 forward portion downwardly to a fixation on the placement unit 1, the actuator 213 will, when pushing, apply a vertical downward load component to the placement unit 1 which together with the placement unit 1 own weight resulting in that the forward and the rear bogies 132, 132' (figure 1) each carry a load respectively P, P' , alternatively that the single depth wheel 132b (figure 2) carries the load P' .
In figure 4 is shown a situation wherein the placement unit 1 has a large own weight in that it comprises an auxiliary equipment 11a, such as a fluid distributor or a seed container. When the seed bed 3 has little carrying capacity and the depth wheels 132b have a tendency to penetrate too deeply down into the seed bed 3 so that the resulting working depth of the coulters is to large, it is desirable to be able to transfer load from the placement unit 1 to the implement carrier 2. By letting the pressure regulating actuator 213 be pointing obliquely from the top link's 212 rear portion downwardly to a fixation on the implement carrier 2, the actuator 213 will, when pushing, apply a vertical upward load component to the placement unit 1 which together with the placement unit ' s 1 own weight results in that the forward and the rear bogies 132, 132' (figure 1) each carry a load respectively P, P' .
The pressure regulating hydraulic cylinder 213 is in a fluid communicating way connected to the hydraulic plant 22 via a hydraulic line A, a pressure regulating valve 136 and a hydraulic line C. From the pressure regulating valve 136 is provided a return line to the hydraulic plant 22 via a hydraulic line B.
The pressure regulating valve 136 is in a signal communicat- ing way connected to the control unit 135 via a control signal line E.
By signal communication between the load sensor 134, the control unit 135 and the pressure regulating valve 136 the hydraulic pressure in the pressure regulating hydraulic cylinder 213 may be adjusted to achieve a desired load on the bogie which is provided with a load sensor, in this case the rear bogie 132' (figure 1), alternatively the single depth wheel 132b (figure 2) . In that there is a continuous hydraulic fluid flow through the pressure regulating valve 136 an approximately continuous adjustment of the pressure in the pressure regulating hydraulic cylinder 213 may be performed to adjust the load on the bogie 132', alternatively the single depth wheel 132b. This is important when driving through a recession or over an elevation in the ground that the seed bed 3 extends over, as the placement unit 1 is vertically rigid connected to the implement carrier 2. In driving in beds 3 for sowing with varying types of soil such as from stiff clay soil to weak boggy soil, the load on the bogie 132', alternatively the single depth wheel 132b, is able to be adjusted during operation for continuous adaptation to the nature of the seed bed 3.
Unevenness in the seed bed 3 in a direction lateral to the working direction R will cause a coulter unit 12, being on a high-lying ground, to generate a pressure increase on one piston-side in the lifting cylinder 133d. This pressure is transmitted to the other lifting cylinders 133d connected in parallel, and the pressure will be evened out by all the lifting cylinders 133d being adjusted so that each coulter unit 12 provides the same wheel pressure against the seed bed 3.

Claims

C L A I M S
1. Device for regulating load transfer from an implement carrier (2) to a forward and a rear depth wheel (132b) or a forward and a rear depth wheel arrangement (132, 132') provided on a placement unit (1) during the conveyance of a coulter (122) by the placement unit (1) in a seed bed (3), the coulter (122) being provided between the forward and the rear depth wheel/depth wheel arrangement (132b, 132, 132') and being fixed to a frame (121) supported by the depth wheel/depth wheel arrangement (132b, 132, 132' ), c h a r a c t e r i s e d i n that a pressure regulating actuator (213) is provided between the implement carrier (2) and the placement unit (1) and is arranged to maintain a prescribed load (P, P') in a support point (132c, 134) for at least one of the forward and the rear depth wheels/depth wheel arrangements (132b, 132, 132'); a weight sensor (134) connected to the support point (132c, 134) being in signal communicating connection with a control unit (135) for the pressure regulating actuator (213) .
2. Device according to claim 1, c h a r a c t e r i s e d i n that at least one coulter (122) and at least one forward and one rear depth wheel (132b) forms a coulter unit (12) being vertically swingingly suspended in a main frame (11) .
3. Device according to claim 1, c h a r a c t e r i s e d i n that the coulter unit (12) is fastened to the main frame (11) by means of a linkage arm (133a) , the linkage arm (133a) being interconnected with a lifting actuator (133d) arranged to be able to turn the link- age arm (133a) about a pivot joint (133c) provided in the connection between the main frame (11) and the linkage arm (133a) .
4. Device according to claim 2, c h a r a c t e r i s e d i n that the lifting actuator (133d) of each coulter unit (12) is a double acting hydraulic cylinder.
5. Device according to claim 3, c h a r a c t e r i s e d i n that all lifting cylinders (133d) for the coulter units (12) are connected in parallel and connected to a hydraulic plant (22) for thereby effecting that the load (P or P' ) applied to each of the forward or rear depth wheel bogies (132, 132') of each coulter (12) are approximately equally large.
6. Device according to claim 1, c h a r a c t e r i s e d i n that the pressure regulating actuator (213) is a hydraulic cylinder.
7. Device according to claim 5, c h a r a c t e r i s e d i n that the pressure regulating hydraulic cylinder (213) is in fluid communication with the hydraulic plant (22) via a pressure regulating valve (136) arranged to maintain the prescribed load (P or P' ) in the support point (132c, 134) when receiving a control signal from the control unit (135) .
8. Device according to claim 1, c h a r a c t e r i s e d i n that the weight sensor (134) is provided on the rear depth wheel bogie (132') provided on the bogie unit (13) which is equipped with two depth wheel bogies (132, 132') mounted substantially in line in the working direction (R) of the coulter unit (1) , and the prescribed load is the load (P' ) on the rear depth wheel bogie (132') .
PCT/NO2009/000166 2008-04-29 2009-04-29 Depth control device for a coulter WO2009134144A1 (en)

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NO20082022 2008-04-29
NO20082022 2008-04-29

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2717667A4 (en) * 2011-06-10 2015-06-03 Great Plains Mfg Inc Agricultural implement having hopper weighing system
EP3020261A1 (en) * 2014-11-12 2016-05-18 Deere & Company Combination of an agricultural towing vehicle and a minimum till seeder
EP3266291A1 (en) * 2011-06-03 2018-01-10 Precision Planting LLC Agricultural toolbar apparatus, systems and methods
US11140812B2 (en) 2017-12-15 2021-10-12 Kinze Manufacturing, Inc. Systems, methods, and apparatus for controlling downforce of an agricultural implement
US11224153B2 (en) 2017-07-28 2022-01-18 Kinze Manufacturing, Inc. Agricultural implement and row units including double acting actuator systems, methods, and apparatus

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4913070A (en) * 1988-04-08 1990-04-03 The United States Of America As Represented By The Secretary Of Agriculture Ground contact implement soil penetration depth control
US6389999B1 (en) * 2001-11-02 2002-05-21 Dennis Duello Dynamic controller of excess downpressure for surface engaging implement
US6701857B1 (en) * 2003-01-16 2004-03-09 Lynn David Jensen Depth control device for planting implement

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4913070A (en) * 1988-04-08 1990-04-03 The United States Of America As Represented By The Secretary Of Agriculture Ground contact implement soil penetration depth control
US6389999B1 (en) * 2001-11-02 2002-05-21 Dennis Duello Dynamic controller of excess downpressure for surface engaging implement
US6701857B1 (en) * 2003-01-16 2004-03-09 Lynn David Jensen Depth control device for planting implement

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3266291A1 (en) * 2011-06-03 2018-01-10 Precision Planting LLC Agricultural toolbar apparatus, systems and methods
US10765054B2 (en) 2011-06-03 2020-09-08 Precision Planting Llc Agricultural toolbar apparatus, systems and methods
US11730077B2 (en) 2011-06-03 2023-08-22 Precision Planting Llc Agricultural toolbar apparatus, systems and methods
EP2717667A4 (en) * 2011-06-10 2015-06-03 Great Plains Mfg Inc Agricultural implement having hopper weighing system
EP3020261A1 (en) * 2014-11-12 2016-05-18 Deere & Company Combination of an agricultural towing vehicle and a minimum till seeder
US9861023B2 (en) 2014-11-12 2018-01-09 Deere & Company Combination of an agricultural towing vehicle and a seeder
US11224153B2 (en) 2017-07-28 2022-01-18 Kinze Manufacturing, Inc. Agricultural implement and row units including double acting actuator systems, methods, and apparatus
US11140812B2 (en) 2017-12-15 2021-10-12 Kinze Manufacturing, Inc. Systems, methods, and apparatus for controlling downforce of an agricultural implement

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