WO2003031883A1 - Device for indication of a work position and control of a length of stroke - Google Patents

Device for indication of a work position and control of a length of stroke Download PDF

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Publication number
WO2003031883A1
WO2003031883A1 PCT/SE2002/001851 SE0201851W WO03031883A1 WO 2003031883 A1 WO2003031883 A1 WO 2003031883A1 SE 0201851 W SE0201851 W SE 0201851W WO 03031883 A1 WO03031883 A1 WO 03031883A1
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WO
WIPO (PCT)
Prior art keywords
working
control
piston rod
cylinder
fluid connection
Prior art date
Application number
PCT/SE2002/001851
Other languages
French (fr)
Inventor
Thord Siljefelt
Original Assignee
Sveaverken Odin Ab
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 Sveaverken Odin Ab filed Critical Sveaverken Odin Ab
Publication of WO2003031883A1 publication Critical patent/WO2003031883A1/en

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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
    • F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
    • F15B11/12—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor providing distinct intermediate positions; with step-by-step action
    • F15B11/13—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor providing distinct intermediate positions; with step-by-step action using separate dosing chambers of predetermined volume
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K1/00—Housing animals; Equipment therefor
    • A01K1/01—Removal of dung or urine, e.g. from stables
    • A01K1/0142—Removal of dung or urine, e.g. from stables by means of a moving piston

Definitions

  • the present invention relates to a device for indication of a work position of and control of a length of stroke of at least one hydraulic working cylinder, the device comprising a hydraulic control cylinder, at least one control device having at least one gauge, at least one reversing valve, at least one pump, at least one piping system and at least one container with a hydraulic fluid.
  • Hydraulic cylinders are commonly located in working environments that are highly stressing for the cylinders as well as to the appurtenant equipment.
  • One example of such an environment is when a hydraulic cylinder is used for scraping out in steps of manure in a gutter in a cowshed. It has turned out that electric micro switches become damaged in this environment when they are placed in direct connection to the hydraulic cylinder in gutters.
  • DE, C1 , 4125829 shows a drive system for a cap, particularly for the cap of a top space in an open private car.
  • a hydraulic working cylinder interacts with a likewise hydraulic control cylinder.
  • the control cylinder 7 com- prises a piston rod, which is provided with a contacting member in the outer end thereof, whereby the contacting member during motion of the piston rod to and fro is alternately brought in contact with each of two gauges 13, 14.
  • the gauges activate a control unit that is in turn in contact with a reversing valve 15.
  • the working cylinder 8 for the actual folding-up of the top may be actuated at a distance from the same that is favourable.
  • the hydraulic system is unnecessarily complicated considering the fact that it is desirable to open the top in a two-step sequence, the first step comprising unlocking of a lock for the cap of the top surface and the second step comprising the proper unfolding of the top.
  • the purpose of the present invention is to bring about a device to indicate work position of and control a working cylinder where the device is constructed as simple as possible and the system simultaneously enables the device to be placed on a location at a distance from the working cylinder, and where switches and the like do not become damaged.
  • the invention thus includes a device for indication of a work position of and control of a length of stroke of at least one hydraulic working cylinder, which working cylinder comprises a first working piston side and a first working piston rod side, and the device comprising a hydraulic control cylinder having a control piston side and a control piston rod side, at least one control device having at least one gauge, at least one reversing valve, at least one pump, at least one piping system and at least one container with a hydraulic fluid.
  • Said piping system is designed in such a way that each of said first working piston side and said control piston side are in fluid connection with said container without being in direct fluid connection with each other at the same time as said first working piston rod side and said control piston rod side are in fluid connection with each other.
  • a plurality of hydraulic working cylinders may occur, whereby said working cylinders are hydraulically connected in parallel in such a way that one of the occurring working piston sides is in fluid connection with said container at the same time as the corresponding working piston rod side is in fluid connection with said control piston rod side.
  • said piping system may comprise at least one shut-off device in the form of a valve or the like, whereby the fluid connection is kept broken between each, except one, of the occurring working piston sides and said container.
  • said piping system may comprise at least one shut-off device in the form of a valve or the like, whereby the fluid con- nection is kept broken between each, except one, of the occurring working piston rod sides and said control piston rod side.
  • the invention also includes a device for indication of a work position of and control of a length of stroke of at least one hydraulic working cylinder, which working cylinder comprises a first working piston side and a first working piston rod side, and the device comprising a hydraulic control cylinder having a control piston side and a control piston rod side, at least one control device having at least one gauge, at least one reversing valve, at least one pump, at least one piping system and at least one container with a hydraulic fluid, whereby said piping system is designed in such a way that each of said first working piston rod side and said control piston rod side are in fluid connection with said container, without being in direct fluid connection with each other at the same time as said first working piston side and said control piston side are in fluid connection with each other.
  • a plurality of hydraulic working cylinders may occur in this case as well, whereby said working cylinders are hydraulically connected in parallel in such a way that one of the occurring working piston rod sides is in fluid connection with said container at the same time as the corresponding working piston side is in fluid connection with said control piston side.
  • said piping system may comprise at least one shut-off device in the form of a valve or the like, whereby the fluid connection is kept broken between each, except one, of the occurring working piston sides and said control piston side.
  • said piping system may comprise at least one shut-off device in the form of a valve or the like, whereby the fluid connection is kept broken between each, except one, of the occurring working piston rod sides and said container.
  • the invention also includes a device for indication of a work position of and control of a length of stroke of at least one hydraulic working cylinder, which working cylinder comprises a first working piston side and a first working piston rod side, and the device comprising a hydraulic control cylinder having a control piston side and a control piston rod side, at least one control device having at least one gauge, at least one reversing valve, at least one pump, at least one piping system and at least one container with a hydraulic fluid.
  • Said piping system is designed in such a way that each of said first working piston side and said control piston rod side are in fluid connection with said container, without being in direct fluid con- , nection with each other at the same time as said first working piston rod side and said control piston side are in fluid connection with each other.
  • a plurality of hydraulic working cylinders may occur in this case as well, whereby said working cylinders are hydraulically connected in parallel in such a way that one of the occurring working piston sides is in fluid connection with said container at the same time as the corresponding working piston rod side is in fluid connection with said control piston side.
  • said piping system may comprise at least one shut-off device in the form of a valve or the like, whereby the fluid connection is kept broken between each, except one, of the occurring working piston sides and said container.
  • said piping system may comprise at least one shut-off device in the form of a valve or the like, whereby the fluid connection is kept broken between each, except one, of the occurring working piston rod sides and said control piston side.
  • the invention also includes a device for indication of a work position of and control of a length of stroke of at least one hydraulic working cylinder, which working cylinder comprises a first working piston side and a first working piston rod side, and the device comprising a hydraulic control cylinder having a control piston side and a control piston rod side, at least one control device having at least one gauge, at least one reversing valve, at least one pump, at least one piping system and at least one container with a hydraulic fluid.
  • Said piping system is designed in such a way that each of said first working piston rod side and said control piston side are in fluid connection with said container, without being in direct fluid connection with each other at the same time as said first working piston side and said control piston rod side are in fluid connection with each other.
  • a plurality of hydraulic working cylinders may occur in this case as well, whereby said working cylinders are hydraulically connected in parallel in such a way that one of the occurring working piston rod sides is in fluid connection with said container at the same time as the corresponding working piston side is in fluid connection with said control piston rod side.
  • said piping system may comprise at least one shut-off device in the form of a valve or the like, whereby the fluid connection is kept broken between each, except one, of the occurring working piston rod sides and said container.
  • said piping system may comprise at least one shut-off device in the form of a valve or the like, whereby the fluid connection is kept broken between each, except one, of the occurring working piston sides and said control piston rod side.
  • Said control cylinder may have a larger cylinder diameter than each one of said occurring working cylinder/working cylinders.
  • Said control cylinder may have an equally large volume of stroke as each one of said occurring working cylinder/working cylinders. Said control cylinder may have a shorter length of stroke than each one of said occurring working cylinder/working cylinders.
  • Said control cylinder may comprise a piston rod, provided with a contacting member at the end, which during the motion to and fro of the piston rod alter- nately affects said at least one gauge, which is in electric contact with said reversing valve via said control device.
  • Said reversing valve may be connected in said piping system in such a way that it, at a signal from either of said at least one gauge, shuts off a fluid flow, brought about by said pump, to a first of said cylinders and instead guides said fluid flow to a second of said cylinders, whereby said second cylinder is said control cylinder when said first cylinder is any one of said working cylinder/working cylinders and vice versa.
  • Each one of occurring said working cylinder/working cylinders may comprise a piston rod, to which at least one demanuring device is connected in the form of a floor scraper or the like for cowsheds or the like, whereby said demanuring device can be put in motion and brought to halt, respectively, in a pattern that is favourable for the demanuring.
  • FIG. 1 shows, in principle, the device according to the invention and how it interacts with a number of working cylinders.
  • FIG 1 a connecting diagram for operation and control of a number of hydraulic working cylinders 1a-1d is shown.
  • four working cylinders are shown, but the number may be chosen freely and according to the invention, at least one working cylinder is presupposed.
  • Each one of the working cylinders 1a-1d has a piston 1.1a-1.1d, and a piston rod 1.2a-1.2d.
  • the device according to the invention comprises a hydraulic control cylin- der 2, which has a piston 2.1 and a piston rod 2.2.
  • the piston 2.1 has a through- going channel that hydraulically connects the piston side and piston rod side in the control cylinder 2, and that in each of the both ends thereof is provided with a compensation valve 2.4, consisting of a check valve 2.4.
  • the check valves are normally closed.
  • a container 3, a pump 4, a reversing valve 5, a control device 6 having two gauges 6.1 , 6.2, and a piping system comprising a number of valves 7a-7d are found, whereby one valve for each working cylinder 1a-1d is found.
  • the system operates in the following way:
  • Hydraulic fluid is sucked up from the container 3 by means of the pump 4, which via the reversing valve 5 pushes the fluid to the piston side on one of the working cylinders, for instance the working cylinder 1a. Fluid, which is on the piston rod side of the piston 1.1a in the working cylinder 1a, is thereby pushed to the piston rod side in the control cylinder 2. Thereby, fluid is pushed in return from the piston side of the control cylinder 2 via the reversing valve 5 back to the container 3.
  • the reversing valve 5 is controlled by means of signals from the control device 6 comprising the gauges 6.1 and 6.2, where the gauge 6.1 may be denominated outer gauge and the gauge 6.2 inner gauge, whereby the gauges 6.1 , 6.2 are placed along the course of motion of the piston rod 2.2 of the control cylinder 2.
  • the end of the piston rod 2.2 in the control cylinder 2 is provided with a contacting member 2.3, which during motion of the piston 2.1 alternately actuates the gauges 6.1 , 6.2, which are in connection with the reversing valve 5 via electric conduits.
  • the length of stroke of the working cylinder 1a may be readjusted by a displacement of one or both of the gauges 6.1 , 6.2, which allows the motion of the working cylinder 1 a to be remote-controlled by means of the control cylinder 2, which constitutes a kind of flow meter.
  • the control cylinder 2 may, in an alternative embodiment, be replaced by a flow gauge.
  • One of the gauges may be spared if the remaining gauge consists of, for instance, a timer.
  • the compensation valves 2.4 enable a synchronization/calibration of the working cylinder 1a and the control cylinder 2. If the piston 2.1 for instance reaches the bottom of the control cylinder 2 before the piston 1 .1 a reaches the top of the working cylinder 1 a, the compensation valves 2.4 are opened, enabling the fluid to flow from the piston rod side in the control cylinder 2 through the piston 2.1 to piston side and further out of the control cylinder 2.
  • the compensation valves 2.4 are opened, enabling the fluid to flow from the piston side in the control cylinder 2 through the piston 2.1 to the piston rod side and further out of the control cylinder 2 to the piston rod side of the working cylinder 1 a until the piston 1.1 a reaches the bottom.
  • valve 7c and the valve 7d are opened and other valves are kept closed.
  • the described valves 7a-7d do not have to be placed as they are in the figure between the piston side of the respective valve and the reversing valve 5, but may just as well be placed in the piping system between the piston rod side of the respective working cylinder 1a-1 d and the piston rod side of the control cylinder.
  • a combination of these placing alternatives is also feasible in such way that a working cylinder 1a-1d may have the valve thereof placed according to figure 1 while another working cylinder 1 a-1d may have the valve thereof placed in the piping system between the piston rod side of the respective working cylinder l a- I d and the piston rod side of the control cylinder 2.
  • the working cylinders 1a-1d and the control cylinder 2 on the respective piston sides thereof instead are connected to each other in the same way as they are connected to each other on the respective piston rod sides thereof in figure 1 and vice versa.
  • the described valves 7a-7d may be placed with a large amount of freedom and in analogy with what is said above. It is also feasible to simultaneously use two or more working cylinders la- Id, and that these operate against the single control cylinder 2, but this implies another volume ratio between, on one hand, the respective working cylinder la- Id, and on the other hand the control cylinder 2.
  • the sum of the volumes of stroke of the concerned working cylinders 1a-1d should in that case be equally large as the volume of stroke of the control cylinder 2.
  • the described gauges 6.1 , 6.2 may be of any expedient known kind, for instance position switches or inductive gauges.
  • the gauges may also be of a nonelectric type, for instance mechanical.
  • the effect of the gauges on the revers- ing valve 5 may occur in a non-electric way, for instance mechanical.
  • the hydraulic fluid used may be of any suitable known kind, for instance hydraulic oil of mineral type or of bio-type based on rape.
  • Any known type of pipe suitable may be used for the piping system, for instance rubber pipes having a pressure resistance of preferably 200 bars.
  • each working cylinder 1a-1 d for propulsion in steps of at least one demanuring device in the form of a floor scraper or the like for each working cylinder 1a-1d in cowsheds or the like, it may be convenient to use the working cylinders 1a-1d in due succession, one after the other, even if another order is also feasible. Then, it is suitable to have a working cylinder 1a-1d with appurtenant floor scraper in each demanuring gutter in a cowshed. Each piston rod 1.2a-1.2d is then suitably connected in the principal longitudinal direction thereof to the respective floor scraper via a runner device (not shown) and a central body device (not shown).
  • the described device according to the invention for control of the respective working cylinder 1a-1d involves the advantage of the respective scraper in the respective demanuring gutter being able to keep the same speed for the motion thereof in both directions. Furthermore, no electric end- position switches are found in the proper demanuring gutter, which is of a great advantage since these end-position switches have turned out to work unsatisfactorily in such environments. It is also advantageous that the position of the con- tacting member 2.3 gives a visual indication of the position of the piston rod in the working cylinder.

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Abstract

The present invention relates, among other things, to a device for indication of a work position of and control of a length of stroke of at least one hydraulic working cylinder (1a, 1b, 1c, 1d), which working cylinder (1a, 1b, 1c, 1d) comprises a first working piston side and a first working piston rod side, and the device comprising a hydraulic control cylinder (2) having a control piston side and a control piston rod side, at least one control device (6) having at least one gauge (6.1, 6.2), at least one reversing valve (5), at least one pump (4), at least one piping system and at least one container (3) with a hydraulic fluid. The device is characterized in that said piping system is designed in such a way that each of said first working piston side and said control piston side are in fluid connection with said container (3), without being in direct fluid connection with each other at the same time as said first working piston rod side and said control piston rod side are in fluid connection with each other.

Description

DEVICE FOR INDICATION OF A WORK POSITION AND CONTROL OF A LENGTH OF STROKE
The present invention relates to a device for indication of a work position of and control of a length of stroke of at least one hydraulic working cylinder, the device comprising a hydraulic control cylinder, at least one control device having at least one gauge, at least one reversing valve, at least one pump, at least one piping system and at least one container with a hydraulic fluid.
Prior art
Hydraulic cylinders are commonly located in working environments that are highly stressing for the cylinders as well as to the appurtenant equipment. One example of such an environment is when a hydraulic cylinder is used for scraping out in steps of manure in a gutter in a cowshed. It has turned out that electric micro switches become damaged in this environment when they are placed in direct connection to the hydraulic cylinder in gutters.
DE, C1 , 4125829 shows a drive system for a cap, particularly for the cap of a top space in an open private car. In the system, a hydraulic working cylinder interacts with a likewise hydraulic control cylinder. The control cylinder 7 com- prises a piston rod, which is provided with a contacting member in the outer end thereof, whereby the contacting member during motion of the piston rod to and fro is alternately brought in contact with each of two gauges 13, 14. The gauges activate a control unit that is in turn in contact with a reversing valve 15. Through the arrangement in question, the working cylinder 8 for the actual folding-up of the top may be actuated at a distance from the same that is favourable. However, the hydraulic system is unnecessarily complicated considering the fact that it is desirable to open the top in a two-step sequence, the first step comprising unlocking of a lock for the cap of the top surface and the second step comprising the proper unfolding of the top.
Summary of the invention
The purpose of the present invention is to bring about a device to indicate work position of and control a working cylinder where the device is constructed as simple as possible and the system simultaneously enables the device to be placed on a location at a distance from the working cylinder, and where switches and the like do not become damaged.
The invention thus includes a device for indication of a work position of and control of a length of stroke of at least one hydraulic working cylinder, which working cylinder comprises a first working piston side and a first working piston rod side, and the device comprising a hydraulic control cylinder having a control piston side and a control piston rod side, at least one control device having at least one gauge, at least one reversing valve, at least one pump, at least one piping system and at least one container with a hydraulic fluid. Said piping system is designed in such a way that each of said first working piston side and said control piston side are in fluid connection with said container without being in direct fluid connection with each other at the same time as said first working piston rod side and said control piston rod side are in fluid connection with each other.
A plurality of hydraulic working cylinders may occur, whereby said working cylinders are hydraulically connected in parallel in such a way that one of the occurring working piston sides is in fluid connection with said container at the same time as the corresponding working piston rod side is in fluid connection with said control piston rod side.
For each of said working cylinders, said piping system may comprise at least one shut-off device in the form of a valve or the like, whereby the fluid connection is kept broken between each, except one, of the occurring working piston sides and said container.
For each of said working cylinders, said piping system may comprise at least one shut-off device in the form of a valve or the like, whereby the fluid con- nection is kept broken between each, except one, of the occurring working piston rod sides and said control piston rod side.
The invention also includes a device for indication of a work position of and control of a length of stroke of at least one hydraulic working cylinder, which working cylinder comprises a first working piston side and a first working piston rod side, and the device comprising a hydraulic control cylinder having a control piston side and a control piston rod side, at least one control device having at least one gauge, at least one reversing valve, at least one pump, at least one piping system and at least one container with a hydraulic fluid, whereby said piping system is designed in such a way that each of said first working piston rod side and said control piston rod side are in fluid connection with said container, without being in direct fluid connection with each other at the same time as said first working piston side and said control piston side are in fluid connection with each other.
A plurality of hydraulic working cylinders may occur in this case as well, whereby said working cylinders are hydraulically connected in parallel in such a way that one of the occurring working piston rod sides is in fluid connection with said container at the same time as the corresponding working piston side is in fluid connection with said control piston side.
For each of said working cylinders, also in this case said piping system may comprise at least one shut-off device in the form of a valve or the like, whereby the fluid connection is kept broken between each, except one, of the occurring working piston sides and said control piston side.
For each of said working cylinders, also in this case said piping system may comprise at least one shut-off device in the form of a valve or the like, whereby the fluid connection is kept broken between each, except one, of the occurring working piston rod sides and said container.
The invention also includes a device for indication of a work position of and control of a length of stroke of at least one hydraulic working cylinder, which working cylinder comprises a first working piston side and a first working piston rod side, and the device comprising a hydraulic control cylinder having a control piston side and a control piston rod side, at least one control device having at least one gauge, at least one reversing valve, at least one pump, at least one piping system and at least one container with a hydraulic fluid. Said piping system is designed in such a way that each of said first working piston side and said control piston rod side are in fluid connection with said container, without being in direct fluid con- , nection with each other at the same time as said first working piston rod side and said control piston side are in fluid connection with each other.
A plurality of hydraulic working cylinders may occur in this case as well, whereby said working cylinders are hydraulically connected in parallel in such a way that one of the occurring working piston sides is in fluid connection with said container at the same time as the corresponding working piston rod side is in fluid connection with said control piston side.
For each of said working cylinders, also in this case said piping system may comprise at least one shut-off device in the form of a valve or the like, whereby the fluid connection is kept broken between each, except one, of the occurring working piston sides and said container.
For each of said working cylinders, also in this case said piping system may comprise at least one shut-off device in the form of a valve or the like, whereby the fluid connection is kept broken between each, except one, of the occurring working piston rod sides and said control piston side.
The invention also includes a device for indication of a work position of and control of a length of stroke of at least one hydraulic working cylinder, which working cylinder comprises a first working piston side and a first working piston rod side, and the device comprising a hydraulic control cylinder having a control piston side and a control piston rod side, at least one control device having at least one gauge, at least one reversing valve, at least one pump, at least one piping system and at least one container with a hydraulic fluid. Said piping system is designed in such a way that each of said first working piston rod side and said control piston side are in fluid connection with said container, without being in direct fluid connection with each other at the same time as said first working piston side and said control piston rod side are in fluid connection with each other.
A plurality of hydraulic working cylinders may occur in this case as well, whereby said working cylinders are hydraulically connected in parallel in such a way that one of the occurring working piston rod sides is in fluid connection with said container at the same time as the corresponding working piston side is in fluid connection with said control piston rod side.
For each of said working cylinders, also in this case said piping system may comprise at least one shut-off device in the form of a valve or the like, whereby the fluid connection is kept broken between each, except one, of the occurring working piston rod sides and said container.
For each of said working cylinders, also in this case said piping system may comprise at least one shut-off device in the form of a valve or the like, whereby the fluid connection is kept broken between each, except one, of the occurring working piston sides and said control piston rod side.
Said control cylinder may have a larger cylinder diameter than each one of said occurring working cylinder/working cylinders.
Said control cylinder may have an equally large volume of stroke as each one of said occurring working cylinder/working cylinders. Said control cylinder may have a shorter length of stroke than each one of said occurring working cylinder/working cylinders.
Said control cylinder may comprise a piston rod, provided with a contacting member at the end, which during the motion to and fro of the piston rod alter- nately affects said at least one gauge, which is in electric contact with said reversing valve via said control device.
Said reversing valve may be connected in said piping system in such a way that it, at a signal from either of said at least one gauge, shuts off a fluid flow, brought about by said pump, to a first of said cylinders and instead guides said fluid flow to a second of said cylinders, whereby said second cylinder is said control cylinder when said first cylinder is any one of said working cylinder/working cylinders and vice versa.
Each one of occurring said working cylinder/working cylinders may comprise a piston rod, to which at least one demanuring device is connected in the form of a floor scraper or the like for cowsheds or the like, whereby said demanuring device can be put in motion and brought to halt, respectively, in a pattern that is favourable for the demanuring.
List of drawings Figure 1 shows, in principle, the device according to the invention and how it interacts with a number of working cylinders.
Description of modes of execution
In figure 1 , a connecting diagram for operation and control of a number of hydraulic working cylinders 1a-1d is shown. In the figure four working cylinders are shown, but the number may be chosen freely and according to the invention, at least one working cylinder is presupposed. Each one of the working cylinders 1a-1d has a piston 1.1a-1.1d, and a piston rod 1.2a-1.2d.
The device according to the invention comprises a hydraulic control cylin- der 2, which has a piston 2.1 and a piston rod 2.2. The piston 2.1 has a through- going channel that hydraulically connects the piston side and piston rod side in the control cylinder 2, and that in each of the both ends thereof is provided with a compensation valve 2.4, consisting of a check valve 2.4. The check valves are normally closed. Furthermore, a container 3, a pump 4, a reversing valve 5, a control device 6 having two gauges 6.1 , 6.2, and a piping system comprising a number of valves 7a-7d are found, whereby one valve for each working cylinder 1a-1d is found. The system operates in the following way:
Hydraulic fluid is sucked up from the container 3 by means of the pump 4, which via the reversing valve 5 pushes the fluid to the piston side on one of the working cylinders, for instance the working cylinder 1a. Fluid, which is on the piston rod side of the piston 1.1a in the working cylinder 1a, is thereby pushed to the piston rod side in the control cylinder 2. Thereby, fluid is pushed in return from the piston side of the control cylinder 2 via the reversing valve 5 back to the container 3.
The reversing valve 5 is controlled by means of signals from the control device 6 comprising the gauges 6.1 and 6.2, where the gauge 6.1 may be denominated outer gauge and the gauge 6.2 inner gauge, whereby the gauges 6.1 , 6.2 are placed along the course of motion of the piston rod 2.2 of the control cylinder 2. The end of the piston rod 2.2 in the control cylinder 2 is provided with a contacting member 2.3, which during motion of the piston 2.1 alternately actuates the gauges 6.1 , 6.2, which are in connection with the reversing valve 5 via electric conduits. In the position that is shown in figure 1 , the piston rod 2.2 in the control cylinder 2 is about to be drawn in until the contacting member 2.3 actuates the inner gauge 6.2, which in that connection delivers a signal to the reversing valve 5, whereby the valve member in the same is displaced to the left in the figure, so that the pump 4 instead pressurises the piston side of the control cylinder 2. Thereby, the piston 1.1a in the working cylinder 1a changes the direction of motion. When the contacting member 2.3 on the piston rod of the control cylinder 2 actuates the outer gauge 6.1 , a new reversal is carried out in the reversing valve 5, whereby the pistons in the respective cylinder change direction of motion again.
The length of stroke of the working cylinder 1a may be readjusted by a displacement of one or both of the gauges 6.1 , 6.2, which allows the motion of the working cylinder 1 a to be remote-controlled by means of the control cylinder 2, which constitutes a kind of flow meter. In effect the control cylinder 2 may, in an alternative embodiment, be replaced by a flow gauge. One of the gauges may be spared if the remaining gauge consists of, for instance, a timer. By making the cylinder diameter of the control cylinder 2 larger than the one of the working cylinder 1 a, the control cylinder 2 can be given a smaller length of stroke. The fluid flow in the two cylinders 1 , 2 is however the same, i.e. the respective volumes of stroke are equally large.
The compensation valves 2.4 enable a synchronization/calibration of the working cylinder 1a and the control cylinder 2. If the piston 2.1 for instance reaches the bottom of the control cylinder 2 before the piston 1 .1 a reaches the top of the working cylinder 1 a, the compensation valves 2.4 are opened, enabling the fluid to flow from the piston rod side in the control cylinder 2 through the piston 2.1 to piston side and further out of the control cylinder 2. On the other hand, if the same piston 2.1 reaches the top of the control cylinder 2 before the piston 1.1 a reaches the bottom of the working cylinder 1 a, the compensation valves 2.4 are opened, enabling the fluid to flow from the piston side in the control cylinder 2 through the piston 2.1 to the piston rod side and further out of the control cylinder 2 to the piston rod side of the working cylinder 1 a until the piston 1.1 a reaches the bottom. By the existence of the described valves 7a-7d, when desired it is possible to use the working cylinder 1 b instead of the working cylinder 1 a by closing the valve 7a and opening the valve 7b instead. If it in a corresponding way is desired to use the working cylinder 1 c and the working cylinder 1 d, respectively, the valve 7c and the valve 7d, respectively, are opened and other valves are kept closed. The described valves 7a-7d do not have to be placed as they are in the figure between the piston side of the respective valve and the reversing valve 5, but may just as well be placed in the piping system between the piston rod side of the respective working cylinder 1a-1 d and the piston rod side of the control cylinder. A combination of these placing alternatives is also feasible in such way that a working cylinder 1a-1d may have the valve thereof placed according to figure 1 while another working cylinder 1 a-1d may have the valve thereof placed in the piping system between the piston rod side of the respective working cylinder l a- I d and the piston rod side of the control cylinder 2.
As an alternative, it is feasible that the working cylinders 1a-1d and the control cylinder 2 on the respective piston sides thereof instead are connected to each other in the same way as they are connected to each other on the respective piston rod sides thereof in figure 1 and vice versa. Also in this case, the described valves 7a-7d may be placed with a large amount of freedom and in analogy with what is said above. It is also feasible to simultaneously use two or more working cylinders la- Id, and that these operate against the single control cylinder 2, but this implies another volume ratio between, on one hand, the respective working cylinder la- Id, and on the other hand the control cylinder 2. The sum of the volumes of stroke of the concerned working cylinders 1a-1d should in that case be equally large as the volume of stroke of the control cylinder 2.
The described gauges 6.1 , 6.2 may be of any expedient known kind, for instance position switches or inductive gauges. The gauges may also be of a nonelectric type, for instance mechanical. Also the effect of the gauges on the revers- ing valve 5 may occur in a non-electric way, for instance mechanical. The hydraulic fluid used may be of any suitable known kind, for instance hydraulic oil of mineral type or of bio-type based on rape. Any known type of pipe suitable may be used for the piping system, for instance rubber pipes having a pressure resistance of preferably 200 bars. In the use of the described working cylinders 1 a-1 d for propulsion in steps of at least one demanuring device in the form of a floor scraper or the like for each working cylinder 1a-1d in cowsheds or the like, it may be convenient to use the working cylinders 1a-1d in due succession, one after the other, even if another order is also feasible. Then, it is suitable to have a working cylinder 1a-1d with appurtenant floor scraper in each demanuring gutter in a cowshed. Each piston rod 1.2a-1.2d is then suitably connected in the principal longitudinal direction thereof to the respective floor scraper via a runner device (not shown) and a central body device (not shown). The described device according to the invention for control of the respective working cylinder 1a-1d involves the advantage of the respective scraper in the respective demanuring gutter being able to keep the same speed for the motion thereof in both directions. Furthermore, no electric end- position switches are found in the proper demanuring gutter, which is of a great advantage since these end-position switches have turned out to work unsatisfactorily in such environments. It is also advantageous that the position of the con- tacting member 2.3 gives a visual indication of the position of the piston rod in the working cylinder.
The invention is not limited to the embodiments shown here, but may be varied within the scope of the appended claims.

Claims

1. Device for indication of a work position of and control of a length of stroke of at least one hydraulic working cylinder (1a, 1b, 1c, 1d), which working cylinder (1a, 1 b, 1c, 1d) comprises a first working piston side and a first working piston rod side, and the device comprising a hydraulic control cylinder (2) having a control piston side and a control piston rod side, at least one control device (6) having at least one gauge (6.1 , 6.2), at least one reversing valve (5), at least one pump (4), at least one piping system and at least one container (3) with a hydraulic fluid, characterized in that said piping system is designed in such a way that each of said first working piston side and said control piston side are in fluid connection with said container (3) without being in direct fluid connection with each other at the same time as said first working piston rod side and said control piston rod side are in fluid connection with each other.
2. Device according to claim 1 , where a plurality of hydraulic working cylinders (1a, 1b, 1c, 1d) are found, whereby said working cylinders (1a, 1 b, 1c, 1d) are hydraulically connected in parallel in such a way that one of the occurring working piston sides is in fluid connection with said container (3) at the same time as the corresponding working piston rod side is in fluid connection with said control piston rod side.
3. Device according to claim 2, wherein said piping system comprises at least one shut-off device (7a, 7b, 7c, 7d) in the form of a valve or the like for each one of said working cylinders (1a, 1 b, 1c, 1d), whereby the fluid connection is kept broken between each, except one, of the occurring working piston sides and said container (3).
4. Device according to claim 2, wherein said piping system comprises at least one shut-off device (7a, 7b, 7c, 7d) in the form of a valve or the like for each one of said working cylinders (1a, 1 b, 1c, 1d), whereby the fluid connection is kept broken between each, except one, of the occurring working piston rod sides and said control piston rod side.
5. Device for indication of a work position of and control of a length of stroke of at least one hydraulic working cylinder (1a, 1 b, 1c, 1d), which working cylinder (1a, 1 b, 1c, 1d) comprises a first working piston side and a first working piston rod side, and the device comprising a hydraulic control cylinder (2) having a control piston side and a control piston rod side, at least one control device (6) having at least one gauge (6.1 , 6.2), at least one reversing valve (5), at least one pump (4), at least one piping system and at least one container (3) with a hydraulic fluid, characterized in that said piping system is designed in such a way that each of said first work piston rod side and said control piston rod side are in fluid connec- tion with said container (3) without being in direct fluid connection with each other at the same time as said first working piston side and said control piston side are in fluid connection with each other.
6. Device according to claim 5, where a plurality of hydraulic working cylin- ders (1a, 1 b, 1c, 1d) are found, whereby said working cylinders (1a, 1 b, 1c, 1d) are hydraulically connected in parallel in such a way that one of the occurring working piston rod sides is in fluid connection with said container (3) at the same time as the corresponding working piston side is in fluid connection with said control piston side.
7. Device according to claim 6, wherein said piping system comprises at least one shut-off device (7a, 7b, 7c, 7d) in the form of a valve or the like for each one of said working cylinders (1a, 1b, 1c, 1d), whereby the fluid connection is kept broken between each, except one, of the occurring working piston sides and said control piston side.
8. Device according to claim 6, wherein said piping system comprises at least one shut-off device (7a, 7b, 7c, 7d) in the form of a valve or the like for each one of said working cylinders (1a, 1b, 1c, 1d), whereby the fluid connection is kept broken between each, except one, of the occurring working piston rod sides and said container (3).
9. Device for indication of a work position of and control of a length of stroke of at least one hydraulic working cylinder (1a, 1b, 1c, 1d), which working cylinder (1 a, 1 b, 1 c, 1 d) comprises a first working piston side and a first working piston rod side, and the device comprising a hydraulic control cylinder (2) having a control piston side and a control piston rod side, at least one control device (6) having at least one gauge (6.1 , 6.2), at least one reversing valve (5), at least one pump (4), at least one piping system and at least one container (3) with a hydraulic fluid, characterized in that said piping system is designed in such a way that each of said first working piston side and said control piston rod side are in fluid connection with said container (3) without being in direct fluid connection with each other at the same time as said first working piston rod side and said control piston side are in fluid connection with each other.
10. Device according to claim 9, where a plurality of hydraulic working cylinders (1a, 1b, 1c, 1d) are found, whereby said working cylinders (1a, 1 b, 1c, 1d) are hydraulically connected in parallel in such a way that one of the occurring working piston sides is in fluid connection with said container (3) at the same time as the corresponding work piston rod side is in fluid connection with said control piston side.
11. Device according to claim 10, wherein said piping system comprises at least one shut-off device (7a, 7b, 7c, 7d) in the form of a valve or the like for each one of said working cylinders (1a, 1 b, 1c, 1d), whereby the fluid connection is kept broken between each, except one, of the occurring working piston sides and said container (3).
12. Device according to claim 10, wherein said piping system comprises at least one shut-off device (7a, 7b, 7c, 7d) in the form of a valve or the like for each one of said working cylinders (1a, 1 b, 1c, 1d), whereby the fluid connection is kept broken between each, except one, of the occurring working piston rod sides and said control piston side.
13. Device for indication of a work position of and control of a length of stroke of at least one hydraulic working cylinder (1a, 1 b, 1c, 1d), which working cylinder (1 a, 1b, 1c, 1d) comprises a first working piston side and a first working piston rod side, and the device comprising a hydraulic control cylinder (2) having a control piston side and a control piston rod side, at least one control device (6) having at least one gauge (6.1 , 6.2), at least one reversing valve (5), at least one pump (4), at least one piping system and at least one container (3) with a hydraulic fluid, characterized in that said piping system is designed in such a way that each of said first work piston rod side and said control piston side are in fluid connection with said container (3) without being in direct fluid connection with each other at the same time as said first working piston side and said control piston rod side are in fluid connection with each other.
14. Device according to claim 13, wherein a plurality of hydraulic working cylinders (1a, 1b, 1c, 1d) are found, whereby said working cylinders (1a, 1b, 1c, 1d) are hydraulically connected in parallel in such a way that one of the occurring working piston rod sides is in fluid connection with said container (3) at the same time as the corresponding working piston side is in fluid connection with said con- trol piston rod side.
15. Device according to claim 14, wherein said piping system comprises at least one shut-off device (7a, 7b, 7c, 7d) in the form of a valve or the like for each one of said working cylinders (1a, 1b, 1c, 1d), whereby the fluid connection is kept broken between each, except one, of the occurring working piston rod sides and said container (3).
16. Device according to claim 14, wherein said piping system comprises at least one shut-off device (7a, 7b, 7c, 7d) in the form of a valve or the like for each one of said working cylinders (1a, 1b, 1c, 1d), whereby the fluid connection is kept broken between each, except one, of the occurring working piston sides and said control piston rod side.
17. Device according to any one of the preceding claims, wherein said control cylinder (2) has a larger cylinder diameter than each of said occurring working cylinder/working cylinders (1a, 1b, 1c, 1d).
18. Device according to any one of the preceding claims, wherein said control cylinder (2) has an equally large volume of stroke as each one of said occurring working cylinder/working cylinders (1a, 1b, 1c, 1d).
19. Device according to any one of the preceding claims, wherein said control cylinder (2) has a shorter length of stroke than each one of said occurring working cylinder/working cylinders (1a, 1b, 1c, 1d).
20. Device according to any one of the preceding claims, wherein said control cylinder (2) comprises a piston rod (2.2), in the end provided with a contacting member (2.3) that during movement of the piston rod (2.2) to and fro alternately actuates said at least one gauge (6.1 , 6.2), which is in electric contact with said reversing valve (5) via said control device (6).
21. Device according to any one of the preceding claims, wherein said reversing valve (5) is connected in said piping system in such a way that it, at a signal from one of said at least one gauge (6.1 , 6.2), shuts off a fluid flow, brought about by said pump (4), to a first of said cylinders (1a, 1b, 1c, 1d, 2) and instead directs said fluid flow to a second of said cylinders (1a, 1b, 1c, 1d, 2), whereby said second cylinder is said control cylinder (2) when said first cylinder is any one of said working cylinder/working cylinders (1a, 1b, 1c, 1d) and vice versa.
22. Device according to any one of the preceding claims, wherein each of occurring said working cylinder/working cylinders (1a, 1 b, 1c, 1d) comprises a piston rod to which at least one demanuring device has been connected in the form of a floor scraper or the like for cowsheds or the like, whereby said dema- nuring device can be put in motion and be brought to halt, respectively, in a pattern that is favourable for the demanuring.
PCT/SE2002/001851 2001-10-11 2002-10-10 Device for indication of a work position and control of a length of stroke WO2003031883A1 (en)

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SE0103391A SE523174C2 (en) 2001-10-11 2001-10-11 Device for indication of working position and control of stroke
SE0103391-9 2001-10-11

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WO2003031883A1 true WO2003031883A1 (en) 2003-04-17

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4125829C1 (en) * 1991-08-03 1992-11-19 Mercedes-Benz Aktiengesellschaft, 7000 Stuttgart, De
DE4424330C1 (en) * 1994-07-11 1995-12-21 Wolfgang Gabriel Hydraulic steering device for vehicle

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4125829C1 (en) * 1991-08-03 1992-11-19 Mercedes-Benz Aktiengesellschaft, 7000 Stuttgart, De
DE4424330C1 (en) * 1994-07-11 1995-12-21 Wolfgang Gabriel Hydraulic steering device for vehicle

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SE0103391D0 (en) 2001-10-11
SE0103391L (en) 2003-04-12
SE523174C2 (en) 2004-03-30

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