SE534020C2 - Utility bracket with hydraulic controlled locking function - Google Patents

Abstract

ll! * AS 2G SAM MEN ÜRÅG Föfeššggande invention eveef a redeknpsfäeïe for a arbeiemeekšn.Reciskepefäeteí šnnefettar Eàskniver with nydrenšâskt menövrerängeeen (1) is .Låeknivarne enernneee may iàeanee cooperation with a reæâekan.Hydreuirnedíeïššêfäreešorgan (S, 4, 5} is provided for iëiiföreeš of nydrauirnedšum tiiinwenävreršnge fi eneï (1). Enššgï upníinnängen är hydfeuitâäifërseierganet (3, 4, fi) färsen; med enfnàienordning (å, å, 19) ener fi ned en måna den vniym hycirauirnedåum sem tâiåfürernanövrerângsdeneï (1). Uppéšänfn enne fne. use of the invented reeskansfäeteï (FÉQ 7)

Description

30 534 020 2 locking release, which enters a locking position on the tool gate. The locking mechanism goes either in the coupling direction of the bracket or 90 degrees across this direction. Tool gate is the part of the work tool that is connected to the tool holder.

In the system described in EP 602 165, the locking system was cast by a rod element, a so-called gate shaft on each side of the tool gate and of two U-shaped and two L-shaped grips on the tool holder. When connected, the U-shaped grips serve as claw-shaped catching means, whereby they are caused to branch the gate shaft on the corresponding side of the tool gate, which gate shaft constitutes gripping means. Then the tool holder and the work tool are rotated relative to each other around the gate shaft branched by the U-shaped handles to a position where the other gate shaft abuts the L-handle. In this position, locking pistons are pushed out of the L-shaped grip to enclose the second gate shaft together with the L-grip. In this case, the work tool is locked to the tool holder. At the same time as the locking movement is performed, the hydraulic coupling units on the implement bracket are moved to interconnection with the corresponding hydraulic coupling units on the work implement.

During the interconnection described in EP 602 165 and other similar systems, problems may arise in ensuring a correct interconnection.

WO 2004/072387 further discloses a system for improved safety when connecting a tool to a tool holder.

The system comprises sensor means and sensing means arranged for information transmission from the sensor means to the sensing means. The sensor member has at least one sensor unit arranged on one of the tool holder and the work tool.

The sensing means has at least one sensing unit arranged on the other of these. With this system, improved safety is achieved, but presupposes the presence of relatively sensitive components in a tough and dirty environment.

A specific problem with this type of coupling of an implement with the tool holder is the possibility of determining whether the locking piston or the locking pistons are correctly positioned in relation to the second gate shaft, i.e. the element of the tool that cooperates with the locking piston for locking.

If the locking piston when it is to be activated for locking is incorrectly aligned, there is a risk that locking will not be completed. In some incorrect positions, this leads to the locking piston striking the gate shaft. However, this is normally a relatively small problem as it is easy for the operator of the work machine to ascertain this. In other incorrect positions, the locking piston may end up on the wrong side of the gate shaft. This is more difficult to detect for the driver because the locking piston has not encountered any obstacle in the actuation stroke and as the visibility is normally obscured in order to be able to notice this with the eyes. If the driver then, believing that the implement is properly attached, this raises the risk of accidents when the implement comes loose. The object of the present invention is to overcome this problem and in a simple manner eliminate or at least reduce the risk of this kind of incorrect connection.

Disclosure of the invention The object set out is achieved in accordance with the invention in that a tool holder of the type indicated in the introduction has the special feature that the hydraulic supply means is provided with a measuring device arranged to measure the volume of hydraulic medium supplied to the actuator.

Since the stroke of the piston member is normally in direct proportion to the volume of hydraulic medium supplied to its actuator, measuring the volume gives an indication of how far the locking piston member has been displaced. The volume representing the stroke corresponding to the correct locking can be easily determined.

A volume smaller than this indicates that the locking piston means has been prevented from reaching grams to the locking position, e.g. in that its outer end abuts the gate shaft with which the locking piston means cooperates during locking. This condition is in itself relatively easy to determine ocularly from the driver's position and is therefore in many cases not so important to detect via the volume measurement.

A volume greater than that corresponding to the correct stroke indicates that the locking piston member has been displaced too far. This can occur if the locking piston means during the locking movement is misaligned so that the locking piston means ends up on the wrong side of the gate shaft on the implement with which locking cooperation is achieved. When the locking piston means ends up on the wrong side, there is normally nothing that stops the movement of the locking piston until its actuator has reached its end position or the movement of the locking piston stops an obstacle which stops the movement later than is the case in the correct locking position. The measurement of the supplied volume of hydraulic medium then indicates a volume which is larger than that corresponding to the correct locking position and therefore gossip that this condition is obvious. This is the most serious condition as it is difficult to visualize from the cab. 20 25 30 534 020 4 The invented tool holder which thus clearly indicates this type of incorrect connection makes it possible to avoid further operation with the incorrect connection. The connection process can be interrupted and redone. This avoids a significant risk of accidents. The invented technique for obtaining this indication is extremely simple and reliable, and is moreover relatively insensitive to disturbances from dirt and the like which are common in the environment in which the invention is normally used.

According to a preferred embodiment of the invention, the hydraulic medium supply means comprises a supply line, and the measuring device is arranged to measure the fate through the supply line.

Arranging the measuring device in this way so that it measures the fate through the supply line constitutes a simple and reliable method of determining the volume of hydraulic medium supplied to the actuator.

According to a further preferred embodiment, the measuring device comprises a choke in the supply line and a pressure sensor on each side of the choke.

The pressure sensors provide information on the pressure drop across the choke.

Based on the pressure drop, one can in a simple way by applying Bemoulli's equation fl calculate the fate through the throttle and thereby added volume of hydraulic fluid.

Calculation of the fl fate as a function of the pressure drop becomes more accurate the smaller the throttle is in relation to the dimension of the supply line. However, the risk of clogging sets a lower limit for the dimensions of the choke. Suitably, the choke has a flow area corresponding to a diameter of 0.5-1.5 mm and a length in the range 0.5-2 mm. In this area, so-called dense throttling, whereby the fate calculation becomes very accurate.

According to a further preferred embodiment, the measuring device comprises a calculation unit arranged to receive signals from each pressure sensor and which is provided with calculation programs comprising algorithm the flow volume flow through the supply line as a function of pressure levels sensed by the pressure sensors and an integration volume algorithm.

Because the measuring device is pre-programmed to adequately convert sensed pressure levels to information on the amount of fate, it is ensured that the indicated fate volume is correct. This eliminates the risk of mistakes due to incorrect handling of the pressure level information.

According to a further preferred embodiment, the measuring device is signal-connected to an indicating device.

Thus, the registered information can be presented to the operator of the machine for quick action if required. Suitably the indicating device is located in a place easily accessible to the driver, e.g. in the work machine's cab.

According to a further preferred embodiment, the indicating device is arranged to trigger a warning signal when a predetermined measured volume is exceeded.

With this embodiment, a complete chain is achieved from measurement to adequate action. The driver does not have to worry about interpreting the measured values, but a result is served in the form OK or not OK. The warning signal can be presented on a display, as an audio signal or as a combination of these.

According to a further preferred embodiment, the locking piston means comprises that each locking piston is provided with a stop surface arranged for abutment against a body of the tool when the tool is locked to the tool holder. The body against which the abutment surface of the locking piston abuts is suitably a gate shaft at the catch side.

The system establishes a distinct stop for the movement of the locking piston and thus creates a clear reference for the position of the locking piston during correct locking, which represents a reference volume to which the added volume during locking movement can be related. In this way it can be easily determined whether the locking piston has been displaced too far or not.

According to a further preferred embodiment, the tool holder comprises hydraulic coupling means for connection to the implement and valve means for selectively connecting the supply line to either the actuator of the locking piston means or to the hydraulic coupling means.

Such a valve means enables the same hydraulic media supply to be used for both the reading and the operation of the implement, which means a simplification and a cost saving. Thanks to the switchable valve means, the hydraulic lines to the tool holder can fulfill the dual function of both operating the locking mechanism and operating the work tool. Thereby, the number of required hydraulic lines of the hydraulic line member is reduced, for example, the number of lines can be reduced from four to two. This reduces the extent of the traction of hydraulic lines along the crane arm as well as the number of swivel passages, so that the construction becomes simpler and thus cheaper.

Together with the measuring device, it provides a total solution that combines great handling safety with minimal wiring.

According to a further preferred embodiment, the tool holder comprises a first part arranged for permanent mounting on work machines and a second part arranged for detachable connection to the first part, the first part comprising a first locking piston means provided with a first hydraulic actuator arranged for locking cooperation with the second the part, and the second part comprises a second locking piston means provided with a second hydraulic actuator arranged for reading interaction with the implement, and wherein the hydraulic medium supply means is arranged for supplying hydraulic medium to both the first and the second actuator and the measuring device is arranged to measure supplied volume of hydraulic medium. each of the actuators.

Many tools that the work machine is intended to handle require the opportunity for great mobility, e.g. a. they should be able to rotate and tilt. Therefore, in general, such functions are built into the tool holder in a so-called tiltrotator. These requirements do not apply to certain work steps or certain tools. Instead, the maximum available force is of interest. For this reason, it is advantageous to assign the rotation and tilt functions in a separate adapter unit between the machine's arm and the implement so that there is a choice to connect an implement with or without this unit. The tool holder thus in this case consists of two parts where the first part is permanently attached to the arm of the work machine and the second part consists of the tiltrotator.

It is then important to be able to easily determine the correct connection at the connection between the arm of the work machine and the tiltrotator as well as between the tiltrotator and the implement. This is ensured with this embodiment where the measuring device checks both connections. The simplicity that the control function according to the invention entails is particularly valuable in this context because there are two couplings to be ensured and because the tiltrotator means that the second coupling does not convey the same direct feeling to the driver.

According to a further preferred embodiment, the locking piston means comprises at least two parallel locking pistons which are displaceable in the same direction, the actuator being arranged to also displace hydraulic coupling means parallel to and in the same direction as the locking pistons.

Two or two locking pistons provide great coupling safety and a coordination in this way of locking movement and coupling movement for the hydraulics provides a fast and secure connection. The measuring device according to the invention is particularly expedient to use in such a construction. However, it should be understood that the invention is also applicable to pistons arranged in other ways, e.g. opposite and which are arranged in the transverse direction in relation to the hydraulic coupling direction.

The above preferred embodiments are set out in the claims dependent on claims 1. It should be emphasized that further preferred embodiments may, of course, be made up of any conceivable combination of the above-mentioned preferred embodiments.

The invention also relates to a work machine comprising a tool holder in accordance with the invention, in particular in accordance with any of the preferred embodiments thereof.

Furthermore, the invention relates to a use of the invented tool holder for attaching a tool to the tool holder, especially in accordance with one of the preferred embodiments of the tool holder.

The invented working machine and the invented use entail advantages of the same kind as with the invented tool and the preferred embodiments thereof and as described above.

The invention is explained in more detail by the following detailed description of exemplary embodiments thereof and with reference to the accompanying drawings.

Brief description of the drawings Fig. 1 is a perspective view of a tool holder and work tool in a first relative position.

Fig. 2 is a perspective view of the components of fi g. 1 in a second relative position.

Fig. 3 is a perspective view of the components of fl g. 1 in a third relative position.

Fig. 4 illustrates the correct connection of the implement and the tool holder. Fig. 5 illustrates a first example of incorrect interconnection.

Fig. 6 illustrates a second example of incorrect interconnection.

Fig. 7 is a hydraulic diagram illustrating the measuring device according to the invention.

Fig. 8 illustrates a detail of the measuring device in fi g. 7.

Fig. 9 is a hydraulic diagram illustrating a second embodiment of the invention.

Fig. 10 is a detail of the hydraulic diagram in fi g. 9 illustrating another operating mode.

Fig. 11 is a tool holder according to a third embodiment of the invention.

Fig. 12 is a diagram illustrating a measuring device according to a further exemplary embodiment.

Fig. 13 schematically shows a work machine provided with a tool holder according to the invention.

Description of exemplary embodiments of the invention in fi g. 1-3 describe a known system for connecting a tool holder to a work tool. What is shown in these figures and the description in connection therewith are thus included in the state of the art, as described, for example, in the said EP 602 165, which is hereby referred to.

The system lay. 1 thus consists of a tool holder 100 and a work tool 200. The tool holder 100 is intended to be mounted on a work machine which, however, is not shown in the clock. The work tool 200 comprises a tool gate 201 which is a part which is connected to the tool holder 100 and is of a standardized design for different types of work tools. The active part of the work tool is not shown in the clock. This is designed differently for different purposes. Through the system, work tools intended for different types of work can thus be connected to the machine's tool holder 100.

The tool holder has a connecting part 101 which is formed with a catcher side 102 to the right of the gear and a locking side 103 to the left of the gear.

The catcher side 102 has two U-shaped profiled recesses 104, of which only one is visible in the clock. The locking side 103 has an L-shaped profile and from this 53 534 020 9 two locking pistons 105 are arranged to be able to slide out in order to form a U-shaped profile together with the L-profile. l fi g. 1, the locking pistons are shown in the extended position.

As shown by fi g. 1, the locking pistons are provided with a bottom portion 106 which, together with the L-shaped profile on the locking side 103 of the connecting day 101, will abut against the gate shaft 203 upon locking.

The bottom portion 106 thus constitutes a stop surface which abuts against the gate shaft.

The tool gate 201 of the work tool 200 is provided with a first gate shaft 202 arranged to cooperate with the catcher side 102 of the tool holder and a second gate shaft 203 arranged to cooperate with the locking side 103 of the tool holder.

When the tool holder is to be connected to the work tool, the tool holder is operated to a catching position illustrated in fi g. 2. This means that the tool bracket 104 of the implement bracket 104 is caused to branch the first gate shaft 202 of the work tool.

The tool holder 100 is in this position angled as shown by the fi clock.

The angular position is not particularly critical at this stage and the angle between the tool holder and the working tool can thus be arbitrary within a certain range.

The next step is to from that in fi g. 2, the position of turning the tool holder 100 and the work tool 200 relative to each other in one direction so that the tool holder 100 is rotated towards the work tool. This is done with the locking pistons in the retracted position so that the tool holder can be turned in so far that the second gate shaft 203 comes into position in the L-profile. Once there, the components are ready for locking. This is done by causing the locking pistons 105 to protrude so that the second gate shaft 203 is locked between the L-profile 103 and the locking pistons 15 are hydraulically operated between their two positions.

I fi g. 3 illustrates the components in the locked position. The implement bracket is provided with a number of hydraulic coupling units and electrical coupling units to be connected to corresponding units arranged on the work implement. The coupling units are arranged on a coupling ramp on each unit. The coupling ramp on the implement bracket is mounted so that it is operated by the same hydraulic cylinders that operate the locking pistons. l fi g. 3, the back of the work tool coupling ramp 204 is visible while its front face as well as the coupling ramp on the tool holder are obscured. The locking pistons are thus extended simultaneously with the coupling units being connected. The invention is of course not limited to the embodiment where this takes place simultaneously.

Nor is the invention limited to an embodiment where the locking pistons are operated in the longitudinal direction of the tool holder as in fi g. 1-3- The locking pistons can thus be arranged so that they are displaced perpendicular to this direction, ie. parallel to the first gate shaft 202. In such a case, the locking pistons can slide into openings in the side pieces of the implement gate. Other arrangements for the operation of the locking pistons are of course also conceivable within the scope of the invention.

Likewise, the capture means can be designed differently than as claw-like elements, ie. The U-profiles, on the tool holder and the gripping member can be designed differently than as a rod element, ie. the gate shaft on the work tool. Thus, for example, the work tool may be provided with claw-like hooks for co-operation with a complementary member on the tool holder.

A critical stage in the connection is when the tool holder 100 is to be turned in from it in fi g. 2 showed the position of it in fi g. 4 showed the interconnection mode. When correctly positioned, the locking pistons 105 in the coupling position must be positioned so that when they are pushed out they end up on the lower side of the second gate shaft 203, ie. inside this.

In case of incorrect positioning, the locking pistons 105 end up so that their outer ends abut against the second gate shaft 203 or so that they end up on the upper side of it, i.e. outside. In this case, the implement 200 will be able to become detached from the implement holder 100 when the implement is lifted, which entails a risk of accident. The following describes how the invention detects such mispositioning so that action can be taken to correct it. The principle is to detect the length of the stroke movement of the pistons when performing the locking movement. Namely, the stroke will be different for the above-mentioned positionings.

Then the positioning is correct as illustrated in fi g. 4, the percussion movement will bring the locking pistons 105 past the gate shaft 203 to the position where the abutment surface 106 of each locking piston 105 abuts the gate shaft, which stops the continued movement of the locking pistons and thus they refer reference to the stroke at correct solution.

If the positioning is such that the outer ends of the locking pistons 105 abut against the gate shaft 203, as illustrated in fi g. 5, their movement is stopped at an early stage, i.e. the stroke length becomes much shorter than the reference length, indicating this type of incorrect positioning. As such, in most cases it is fairly easy for the driver to notice such a misalignment with the eyes and the recovery is therefore normally not so important for this indication.

If, on the other hand, the locking pistons 105 end up on the outside of the gate shaft 203, as illustrated in fi g. 6, such mispositioning can be difficult to detect. In such positioning, the movement of the locking pistons 105 will not be stopped by the abutment surfaces 106 of the locking pistons abutting against the gate shaft 203, but the striking movement continues as far as the stroke of the hydraulic cylinder constituting the actuator allows. The stroke length in this case becomes longer than the reference length and thus constitutes an indication of this type of incorrect positioning.

The stroke of the pistons is directly proportional to the volume of hydraulic fluid supplied to the hydraulic cylinder of the control vehicle.

Fig. 7 shows the actuator for the locking pistons 105 in fi g. 1. It consists of two hydraulic cylinders 1, each piston rod 2 of which is connected to a respective locking piston 105. The hydraulic medium supply means comprises a tank 3 a pump 4 a supply line 5 and a return line 6. A reversing valve 7 connects the pump 4 to either the supply line 5 or the return line 6 In the position shown for the reversing valve 7, the pump is connected to the supply line 5. From the supply line, the hydraulic fluid, usually oil, is distributed to a respective branch line 51 via a respective non-return valve 52 to each of the pressure side of the hydraulic cylinders 1. The return line 6 is connected via a respective branch line 61 to each of the return side of the hydraulic cylinders 1.

The measuring device 5 is arranged in the supply line 5. It consists of a throttle 8 and a first 9 and second 10 pressure sensor. When the pump 4 pumps oil to the respective pressure side of the hydraulic cylinders 1 through the supply line, the throttle 8 will cause a pressure drop which is registered by the pressure sensors 9, 10.

This allows determination of the volume supplied to the hydraulic cylinders 1 in a manner explained in more detail in connection with fi g. 8.

The choke 8 is a so-called sharp-edged choke so that the fate through the choke becomes independent of the viscosity of the oil, so-called densitic throttling. The choke site consists of a wall 88 in which a through hole 89 is occupied. The hole 89 is on the upstream side opening into a flat wall so that the area change becomes immediate at the edge of the hole 89 against the wall. On the downstream side, the hole may result in a softer area change. With this type of throttling, the fate depends solely on the pressure drop across the throttling, the density of the oil and a constant Cd. The arrow indicates the direction of fate.

The flow through the choke, which is derived from Bernoulli's equation, is calculated according to the expression below and applies with great accuracy under the conditions given below. CV x CC A = cross-sectional area p = density of the oil P1P2 = the pressures before and after the throttling in MPa The expression applies provided that the flow rate before and after the throttling is negligible compared to the speed in the throttling opening, ie. that ød << øD and that the length L of the choke in the flow direction is negligible compared to other dimensions. For a mineral oil type oil within the viscosity range 15-40cst, the fl fate factor can be set to Cd = 0.65-0.70.

By measuring P1 and P2 via the two pressure sensors 9, 10, a direct value of the instantaneous fl speed of velocity Q is obtained through the supply line 5. A time integration, ie. ZQdr during stroke movement gives directly added volume of oil as a result and thus a measure of stroke length. The table below lists interesting data for a number of models of different sizes of tool mounts for the invention. In all models, the locking takes place with two locking pistons and the actuator has two cylinders.

By volume locking is meant the volume of hydraulic fluid that is supplied when the correct locking position has been assumed by the pistons. Vacuum stroke volume is the volume which is represented by the full stroke of the cylinders and which is achieved when the locking position is incorrect so that the locking pistons end up outside the gate shaft, whereby the piston movement does not meet any obstacle. 20 534 020 13 Model øcyl Stroke Volume Volume Stroke] at Over Diff empty empty stroke locking lock stroke lock Q [mm] [mm] [Cms] [Gma] [mm] [mm] [%] Å 20 59 37.1 33, 9 54 5 8.5 B 32 59 94.9 79.6 49.5 9.5 16.1 C 35 60 115.5 103.7 53.9 6.1 10.2 D 40 65 163.4 149, 5 59.5 5.5 8.5 E 50 70 274.9 249.4 63.5 6.5 9.3 F 55 75 356.4 297.0 62.5 12.5 16.7 G 55 75 356 .4 332.6 70 5 6.7 H 60 100 565.5 497.6 88 12 12.0 l 80 129 1296.8 1241 .6 123.5 5.5 4.3 As can be seen from the column on the far right is the difference in volume and in stroke length significant between a locking position and empty position, ie. incorrect positioning.

It varies between 4.3 and 16.7% depending on the model size. This difference is with a good margin sufficient to obtain with the specified measurement method a reliable information on correct or incorrect condition prevails, since the error margin is a single percentage.

Figs. 9 and 10 illustrate a second embodiment of the invention, in which reversing valves are arranged to direct the hydraulic oil to either the locking cylinders or the hydraulic couplings.

Fig. 9 illustrates the position when the hydraulics are connected to lock the work tool. In the valve block 109 two switching valves 55, 56 are arranged.

Each inlet side of the valve is connected to a respective hydraulic line 5, 6 from the hydraulic power source 3. Each valve 55. 56 can be switched to two different positions, for connection of the output side to either the hydraulic coupling units 57, 67 or to the hydraulic cylinders 16a, 16b in the position shown are the hydraulic lines 24a, 24b connected to the hydraulic cylinders 1. When the implement bracket 200 and the work implement are positioned in the correct position as previously described, the supply line 5 is pressurized so that via the valve 55 and the hydraulic cylinder line 53 the pistons are displaced upwards in the figure. bringing the coupling units 57, 67 on the coupling ramp 104 into engagement with the coupling units 58, 68 on a coupling ramp 204 arranged on the implement gate as described in connection with Figs. 1-3.

When the locking tempo is completed, the valves 55, 56 are switched to it in fi g. 10 showed the situation. The locking pistons are now in the locked position and the coupling units 57, 67, 58, 68 of the coupling ramps 104, 204 are connected. In this case, the lines 5, 6 are connected to the hydraulics of the work tool via the valves 57, 67, 58, 68.

The work tool is then in an operational condition. Arranged between each hydraulic coupling line 56, 66 is a connecting line 59, 69 to the hydraulic cylinder line 53 which is pressurized during locking. In each connecting line 59, 69 a non-return valve is arranged. These are so directed that fl fate is allowed from the respective hydraulic coupling line to said hydraulic cylinder line but not in the opposite direction. This ensures that the pressure is maintained on the pressure side of each hydraulic cylinder during operation thanks to the fact that pressurized hydraulic oil from either of the hydraulic coupling lines 56, 57 can be forced into the hydraulic cylinder line 53 in the event that the pressure in the hydraulic cylinder tends to decrease. This by-pass function thus constitutes a locking latch.

When the work tool is to be detached from the tool holder, for example for changing tools, the valves are switched to the one in fi g. 5 and the locking pistons are retracted by pressurizing the other side of each hydraulic cylinder (the upper one in the gear) by means of the reversing valve 7 (see fi g. 7). At the same time, the coupling ramps 104, 204 are disconnected from each other.

The one adjacent to fi g. 7, the measuring device 8, 9, 10 is arranged in the part of the supply line which is constituted by the hydraulic cylinder line 53.

Fig. 11 is a schematic illustration of further embodiments according to the invention. In this case, the tool holder consists of a first part 100 and a second part 300. The first part 100 is permanently connected to the arm 401 of the work machine and is designed as shown in Figs. 1 illustrated the tool holder 100.

The second part 300 is connected easily detachable from the first part 100 and is on the side intended for coupling with the first part 100 formed with a coupling gate corresponding to the tool gate of the tool 200 in fi g. 1. The parts 100, 300 are connected in the same way as described in connection with fi g. 1-3.

The second part 300 further has a tool coupling side for coupling to a tool 200. The coupling side is designed in the same way as for the tool holder illustrated in fi g. 1 and interconnection with the implement takes place in a corresponding manner.

The components of the first part 100 for interconnection with the second part 300 are in principle identical to the components of the second part 300 for interconnection with the tool 200. A tool 200 can thus be applied to the work machine either directly on the first part 100 or via the second part 300.

The second part 300 is a so-called tiltrotor which has functionality for rotation and tilting of the implement 200. It is switched on when these functions are required for the implement. It can be removed as these functions are not required if e.g. all available power is desired to be used for the tool.

The supply line 5 is connectable to both the hydraulic cylinders 1 of the first part 100 for maneuvering its locking pistons and to the hydraulic cylinders 1a of the second part 300 for maneuvering its locking pistons. The measuring device 8, 9, 10 is used for checking both the connection of the tiltrotor 300 to the first part 100 and for the connection of the implement 200 to the tiltrotor 300. A suitable valve system (not shown) assigns the measuring device 8, 9, 10 control of the respective locking pistons and ensures that the pressure is maintained in the cylinders 1 of the first part when the control function is connected to the cylinders of the tiltrotor 300.

Fig. 12 is a diagram illustrating an exemplary embodiment in which the measuring device comprises further components for processing and transmitting the information from the pressure sensors 8, 9.

Each pressure sensor 8, 9 is connected via a respective signal line 81, 91 to a calculation unit 80 which is programmed to calculate the instantaneous genom through the supply line on the basis of values of the sensed pressures. It is further provided with a time integration function for calculating the total volume of oil supplied to the hydraulic cylinders of the actuator. The calculation unit also contains stored data, including reference data for the volume at the correct connection, and other information required to determine whether the correct connection has taken place or not.

The information processed by the calculation unit 80 is transmitted via a signal line 82 to an indicating device 83, which is suitably arranged in the operator's operator's shelf. The indication device 83 may comprise a display 84 534 020 16 which presents relevant data, and warning units such as e.g. a warning lamp 85 and / or an audio signal sensor 86.

It is also possible in connection with the indicating device 83 to arrange inputs for commands from the driver, e.g. control signals to the computing unit for influencing its parameters and algorithms and for selecting methods for the presentation of the signals to the indicating device 83.

Fig. 13 illustrates a work machine 400 provided with a tool holder according to the invention.

Claims (12)

20 30 534 020 17 PATENT REQUIREMENTS A tool holder (100; 100, 300) for a work machine, which tool holder comprises a locking piston means provided with hydraulic actuator (1, 2) comprising at least one locking piston (105) arranged for reading interaction with a tool (200) and hydraulic medium supply means (3). , 4, 5) for supplying hydraulic medium to the actuator (1, 2), characterized in that the hydraulic medium supply means (3, 4, 5) is provided with a measuring device (8, 9, 10) arranged to measure the volume of hydraulic medium supplied to the actuator (1). ). Tool holder according to claim 1, characterized in that the hydraulic medium supply means (3, 4, 5) comprises a supply line (5), and the measuring device (8, 9, 10) is arranged to measure the flow through the supply line (5). Tool holder according to claim 2, characterized in that the measuring device (8, 9, 10) comprises a choke (8) in the supply line (5) and a pressure sensor (9, 10) on each side of the choke (8). Tool holder according to claim 3, characterized in that the measuring device comprise a calculation unit (80) arranged to receive signals (81, 91) from each pressure sensor (9, 10) and which is provided with a calculation program comprising algorithm de pressure levels sensed by the pressure sensors (9, 10) and further comprises an integration algorithm integrating the fate rate for calculating the amount of hydraulic medium supplied. Tool holder according to Claim 4, characterized in that the measuring device (8, 9, 10) is signal-connected to an indicating device (83). Tool holder according to Claim 5, characterized in that the indicating device (83) is arranged to trigger a warning signal (85, 86) when a predetermined measured volume is exceeded. 20 25 30 534 020 18 Tool holder according to one of Claims 1 to 6, characterized in that the locking piston means comprises that each locking piston (105) is provided with a stop surface (106) arranged for abutment against a body (203) of the tool (200) when the tool is locked to the tool holder ( 100; 100, 300). Tool holder according to one of Claims 1 to 7, characterized in that the tool holder (100; 100, 300) comprises hydraulic coupling means (57, 58) for connection to the tool (200) and valve means (55, 56) for selective connection of the supply line (5). to either the actuator (1, 2) of the locking piston means or to the hydraulic coupling means (57, 58). Tool holder according to one of Claims 1 to 8, characterized in that the tool holder (100, 300) comprises a first part (100) arranged for permanent mounting at the work machine (400) and a second part (300) arranged for detachable connection to the first part. (100), the first part (100) comprising a first locking piston means (105) provided with a first hydraulic actuator (1) arranged for locking cooperation with the second part (300), and the second part (300) comprises a second hydraulic actuator (1a) provided with second locking piston means arranged for reading interaction with the implement (200), and wherein the hydraulic medium supply means (3, 4, 5) is arranged for supplying hydraulic medium to both the first (1) and the second (1a) actuator and the measuring device (8, 9. 10) is arranged to measure the supplied volume of hydraulic medium for each of the actuators (1, 1a). Tool holder according to one of Claims 1 to 9, characterized in that each locking piston means comprises at least two parallel locking pistons (105) which are displaceable in the same direction and in that each actuator (1, 2) is arranged to also displace hydraulic coupling means (57, 67) in parallel. with and in the same direction as the locking pistons (105). A work machine (400) comprising a tool holder (100; 100, 300) according to any one of claims 1-10. 534 020 19 Use of a tool holder according to any one of claims 1-10 for attaching a tool to the tool holder.