EP0758718B1 - Plough turning device - Google Patents

Plough turning device Download PDF

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Publication number
EP0758718B1
EP0758718B1 EP96202196A EP96202196A EP0758718B1 EP 0758718 B1 EP0758718 B1 EP 0758718B1 EP 96202196 A EP96202196 A EP 96202196A EP 96202196 A EP96202196 A EP 96202196A EP 0758718 B1 EP0758718 B1 EP 0758718B1
Authority
EP
European Patent Office
Prior art keywords
port
plough
turning
hydraulic
width
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
EP96202196A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0758718A1 (en
Inventor
Jacobus Johannes Josephus Ronald Leblanc
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Enerpac Tool Group Corp
Original Assignee
Actuant Corp
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 Actuant Corp filed Critical Actuant Corp
Publication of EP0758718A1 publication Critical patent/EP0758718A1/en
Application granted granted Critical
Publication of EP0758718B1 publication Critical patent/EP0758718B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/20—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors controlling several interacting or sequentially-operating members

Definitions

  • the invention relates to a hydraulic operating device for a plough which can be turned and whose width can be adjusted, according to the preamble of claim 1.
  • a half-turn plough is fastened to the back of a tractor using a structure which makes it possible to plough on one of the two sides of the tractor as desired.
  • the plough then has to be readjusted to the desired plough width.
  • the two abovementioned main movements of the half-turn plough are usually carried out by means of two hydraulic cylinders.
  • the pressurized hydraulic fluid to be fed to these cylinders is usually supplied by a hydraulic pump unit which is present on the tractor and comprises a pump and a reservoir.
  • a known device of the type mentioned in the preamble comprises, for the purpose of actuating the turning cylinder, a hydraulic turning circuit as described in European Patent Specifications EP-0,434,531 and EP-0,438,936.
  • the driver of the tractor has to actuate the desired sequence of movements of the two hydraulic cylinders by operating a number of operating buttons in a specific order.
  • the present invention aims to provide a device which carries out the entire sequence of movements on the basis of one single operating command by the driver and can be installed for any desired hydraulic turning device.
  • the present invention aims to achieve this using hydraulic means and in such a manner that only two hydraulic lines and associated releasable couplings are required to connect the hydraulic unit present on the tractor to the hydraulic operating device.
  • Figure 1 depicts a hydraulics diagram of a hydraulic operating device for a half-turn plough according to the invention.
  • the device comprises a double-acting hydraulic cylinder 1, which is used for adjusting the plough width of the plough.
  • the cylinder 1 is referred to as width-adjustment cylinder 1.
  • the device comprises a double-acting hydraulic cylinder 2, which is used for turning the plough between a first turned position, in which the plough is situated on one side of the tractor, and a second turned position, in which the plough is situated on the other side of the tractor.
  • the cylinder 2 is referred to as turning cylinder 2.
  • the pressurized hydraulic fluid required for operating the cylinders 1 and 2 is provided by a hydraulic unit on the tractor.
  • This unit comprises an essentially depressurized reservoir 3 for the hydraulic fluid and a hydraulic pump 4.
  • Also located on the tractor are two connections 5 and 6, preferably quick-coupling connections, for the hydraulic operating device according to the invention.
  • a 4/3-way slide valve 7, which is designed to be operated by hand, is situated between the connections 5 and 6 on the one hand and the reservoir 3 and the pump 4 on the other hand.
  • the valve 7 has a neutral central position, in which the connections 5 and 6 are closed off; in the other two positions, in each case one of the two connections 5 and 6 is connected to the reservoir 3 and the other to the pump 4.
  • the hydraulic operating device comprises a hydraulic turning circuit 10 (dashed line) of a design known per se.
  • a hydraulic turning circuit 10 dashed line
  • EP-0,434,531 and EP-0,438,936 European Patent Specifications
  • the turning circuit 10 comprises a pressure port A', a return port B', as well as a first connection port W1 and a second connection port W2 for the turning cylinder 2 and a slide valve 11.
  • the turning circuit 10 ensures that, if pressurized hydraulic fluid is fed to the pressure port A', the turning cylinder 2 moves from its one limit position to its other limit position, irrespective of which limit position the turning cylinder 2 assumes at the start of the feed of liquid to the pressure port A'.
  • the fluid displaced at the other side of the piston of the turning cylinder 2 flows away via the return port B'.
  • the hydraulic operating device further comprises a hydraulic sequencing circuit 20.
  • Fig. 1 shows a preferred embodiment of the sequencing circuit in a hydraulics diagram.
  • the sequencing circuit 20 comprises:
  • the hydraulic sequencing circuit 20 furthermore comprises a slide valve 21, which can assume two positions.
  • the slide valve 21 permits flow between the pressure port P and the first connection port D and between the second connection port C and the return port R.
  • the slide valve 21 permits flow between the pressure port P and the second connection port C and between the pressure port P and the third connection port A, which in turn is directly connected to the pressure port A' of the turning circuit 10.
  • the slide valve also permits flow from the first connection port D to the return port R.
  • the slide valve 21 is subjected to a number of forces for setting the desired position of the slide valve 21. These forces are:
  • the hydraulic sequencing circuit 20 furthermore comprises a second slide valve 30.
  • This slide valve 30 has a sliding body which can assume two positions. In the first position, shown in Figure 1, the slide valve 30 permits flow between the first port 21a of the slide valve 21 and the second connection port C and between the second port 21b of the slide valve 21 and the third connection port A. In the second position thereof, the slide valve 30 permits flow between the second port 21b of the slide valve 21 and the third connection port A, while no flow is possible between the port 21a and the second connection port C.
  • the sliding body of the slide valve 30 has throttling elements 31 and 32, so that there is always throttling in the path between the port 21b and the third connection port A.
  • a non-return valve 40 is incorporated in the sequencing circuit 20 according to the invention, in a parallel connection between the second connection port C and the return port R, which non-return valve closes in the direction of the return port R.
  • the value of the plough width is maintained by the hydraulic locking of the position of the piston rod of the width-adjustment cylinder 1 by means of the two hydraulically operated non-return valves 51 and 52.
  • the hydraulic operating device is that only two connections to the hydraulic unit (pump 4, reservoir 3) are required. Furthermore, the device is constructed so as to operate completely hydraulically, which provides a high reliability and durability. Furthermore, it is possible to use components which already exist and have been tested, such as the turning circuit 10.
  • FIGS 2, 3 and 4 show the hydraulic sequencing circuit 20 of Figure 1, constructed as a valve block.
  • the valve block 60 comprises ports P, R, D, C, A, B corresponding to the ports of the hydraulic sequencing circuit 20 indicated in Figure 1.
  • pressurized hydraulic fluid When, in the situation shown in Figure 2, pressurized hydraulic fluid is fed to pressure port P, this fluid flows via the annular chamber 63 formed in the outer circumference of the sliding body 61 of slide valve 62 (corresponding to slide valve 21 in Fig. 1) to the first connection port D.
  • the slide valve 62 is in this case situated in its first position (corresponding to Fig. 1).
  • the flow of fluid then passes from port D to the width-adjustment cylinder which is connected thereto.
  • the return flow from the width-adjustment cylinder passes via second connection port C to the annular chamber 72 formed in the outer circumference of sliding body 70 of slide valve 71 (corresponding to slide valve 30 in Fig. 1), which is at that moment in its first position.
  • the return flow proceeds from the annular chamber 72 to the chamber 64 and, from there, it can flow to the return port R connected to the reservoir.
  • the annular chamber 63 is connected via a radial passage 65 in the sliding body 61 to a blind bore 66 extending axially in the sliding body 61.
  • a correspondingly displaceable pin 67 projects into the bore 66.
  • the hydraulic fluid fed to pressure port P flows to chamber 69 at the end of sliding body 61 and, from there, to the bore 75 formed in the valve block 60, in which the sliding body 70 can be appropriately displaced.
  • a passage 76 which functions as the throttling element for the flow of fluid, extends from the one end to the other end of the essentially cylindrical sliding body 70 of the slide valve 71.
  • the flow of fluid through this passage 76 acting as the throttle generates a pressure difference which moves the sliding body 70 into the position shown in Figure 3, counter to the force of the return spring 77 (corresponding to return spring 33 in Figure 1).
  • This flow then reaches the third connection port A of the hydraulic sequencing circuit 20. From there, the flow arrives at the turning cylinder in the manner described with reference to Figure 1.
  • the return flow from the turning cylinder flows via port B directly to port R.
  • valve block 60 returns to its position shown in Figure 2.
  • the ball non-return valve 90 which is visible in Figures 2, 3 and 4 corresponds to the non-return valve 40 in Figure 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Soil Working Implements (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
  • Actuator (AREA)
  • Lifting Devices For Agricultural Implements (AREA)
EP96202196A 1995-08-11 1996-08-05 Plough turning device Expired - Lifetime EP0758718B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1000971 1995-08-11
NL1000971A NL1000971C2 (nl) 1995-08-11 1995-08-11 Ploegwentelinrichting.

Publications (2)

Publication Number Publication Date
EP0758718A1 EP0758718A1 (en) 1997-02-19
EP0758718B1 true EP0758718B1 (en) 2002-07-03

Family

ID=19761432

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96202196A Expired - Lifetime EP0758718B1 (en) 1995-08-11 1996-08-05 Plough turning device

Country Status (5)

Country Link
EP (1) EP0758718B1 (nl)
AT (1) ATE220180T1 (nl)
DE (1) DE69622098T2 (nl)
NL (1) NL1000971C2 (nl)
NO (1) NO308489B1 (nl)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2765924B1 (fr) * 1997-07-10 2002-02-01 Kuhn Huard Sa Dispositif permettant de commander deux verins
NL1013077C2 (nl) 1999-09-17 2001-03-20 Applied Power Inc Kleppensamenstel, in het bijzonder voor een hydraulische ploegwentelinrichting.
FR2814510B1 (fr) * 2000-09-27 2003-04-25 Forhydro Distributeur hydraulique, circuit hydraulique comprenant un tel distributeur pour la commande des mouvements de deux verins double effet
NL1020827C2 (nl) 2002-06-11 2003-12-15 Actuant Corp Ploegwentelinrichting.
ITVR20130248A1 (it) * 2013-11-21 2015-05-22 Oleodinamica Marchesini S R L Struttura di valvola di azionamento di cilindri oleodinamici per la rotazione e l'allineamento di aratri
CN107061395B (zh) * 2017-04-13 2018-07-24 宜昌精博艺工程机械设备制造有限公司 凿岩机防空击、防卡节能型液压系统及控制方法
CN106949108B (zh) * 2017-04-13 2018-07-24 宜昌精博艺工程机械设备制造有限公司 凿岩机防空冲击液压系统及控制方法
CN108591153B (zh) * 2018-05-18 2020-04-14 温岭市金盾工程机械制造有限公司 一种多路阀
CN108591154B (zh) * 2018-05-18 2020-04-03 徐海霞 一种翻转犁用的自动控制液压阀
CN108612694B (zh) * 2018-05-18 2020-09-04 江苏金晟元特种阀门股份有限公司 一种控制阀

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2656386B1 (nl) * 1989-12-22 1992-04-30 Matairco Hydro Air Sa
FR2656385B1 (nl) * 1989-12-22 1992-04-30 Matairco Hydro Air Sa
FR2720123B1 (fr) * 1994-05-19 1996-08-14 France Power Packer Sa Automatisme de commande hydraulique, notamment pour charrue.

Also Published As

Publication number Publication date
DE69622098D1 (de) 2002-08-08
ATE220180T1 (de) 2002-07-15
EP0758718A1 (en) 1997-02-19
NO963334D0 (no) 1996-08-09
NL1000971C2 (nl) 1997-02-12
DE69622098T2 (de) 2003-02-27
NO963334L (no) 1997-02-12
NO308489B1 (no) 2000-09-18

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