EP0844364A2 - Device for removing drill cuttings from augers - Google Patents

Abstract

This original stripper unit removes drillings from the intermediate spaces (82) between adjacent flights of the spirals of an earth borer (48). A stripping section (80) can be moved from between the flights to a position outside the edge contour of the borer. The original feature is that the stripper (80) is held against rotation, but can slide on a carrier extending along and parallel to the borer. This moves between a working position where the stripper is engaged, and a neutral position where the stripper is pulled outside the borer contour, to a neutral position. Preferably the stripper is spring-loaded into a mean axial location on the carrier. Two springs are used, acting against the edge surfaces of the stripper and stops on the carrier, or a mounting carrying it. The carrier is a polygonal rod, the stripper having a guide recess running on it, with sliding play. Alternatively pair of circular rods is used for the carrier, in a similar arrangement. The measuring unit gives a signal indicating stripper position on the rod(s). There are one or more stress gauges, mechanically in series with the spring loading. A measuring unit works with the drives and the desired stripper position indication on its carrier. Control loops are included, with limits on the maximum upper and lower positions indicated by the sensors. There is no output signal when the input signals are within tolerance limits, otherwise an error signal results. Further details of the drive and the neutral position indicator are provided.

Description

The invention relates to a device for removal of drilling material from the spaces between the aisles a helical rib of an earth auger according to the preamble of claim 1.

Such known devices typically include a hand-operated scraper, which by a Worker is held. The worker holds the stripper when rotated by the driver of a drill and at the same time hoisted auger, the the Stripping part holding the stripping part Recording the reaction torque on a fixed Can support part of the drilling device and smaller Fluctuations between that corresponding to the pitch of the helical rib Ratio between drawing speed and speed of rotation of the auger and the actual ratio between these speeds manually Compensate for inclination or height adjustment of the scraper part can.

For drilling rigs, which also have a drill pipe string brought into the ground by a second drive head which is connected to the upper one via a drive tube End of the drill pipe is connected, this must be described above Stripping the between the gears of the spiral rib of the earth auger hanging between the Drill pipe drive head and the earth drill drive head take place, so often at a higher altitude above the earth's surface. This is for the worker leading the stripping part uncomfortable and associated with a hazard, on the other detached chunks of soil fall a larger one Route down causing other workers on the construction site may be at risk.

The present invention is therefore intended to provide a device to remove drillings from the spaces between the corridors of a helical rib of an earth auger in which the stripping of the drilling material without manual Intervention can take place.

This object is achieved by a Device with the features specified in claim 1.

In the stripping device according to the invention that is Scraper part slidable parallel to the drill axis arranged a support member, but of this rotationally held. In this way, the scraper part Torques occurring when stripping drill material transferred to the supporting part, from where it is then to a frame-fixed structure are forwarded. On the other hand the scraper part can move parallel to the drill axis, if the axial speed and the rotational speed of the drill does not exactly match the pitch of the helical rib correspond. The deflection of the scraper part the supporting part can be observed visually and for Readjustment of either the rotational speed or the Pulling speed of the earth auger serve. To do this facilitate the stripping device is preferred set up on the drill so that the operator of the drill from whose cabin is clearly visible.

Advantageous developments of the invention are in the subclaims specified.

With the development of the invention according to claim 2 is achieved that the scraper part first in a middle position is biased. So it can Mismatches in drawing speed and rotation speed of the earth auger in both directions follow the mismatch.

The development of the invention according to claim 3 enables a hard pretensioning of the stripping part in its basic position and avoids a reversal of the Direction of loading in the preload spring arrangement.

The developments of the invention according to the claims 4 and 5 are in terms of good and precise guidance of the scraper part on the support part and at the same time good torque support of the supporting part is an advantage. These advantages are obtained using commercially available standard components at low cost.

The development of the invention according to claim 7 enables a check of the position of the scraper part on the support part even in cases where a Visual contact to the wiping part for the operator of the drill cannot be realized. Furthermore, can the output signal of the position measuring device too for automatic readjustment of the relationships between Pulling speed and speed of rotation of the hearth drill be used.

The development of the invention according to claim 7 has the advantage that in the actual adjustment of the Scraper part that is particularly at risk of dirt is, no moving parts of the position measuring device Has. Force sensors can also be closed as compact Manufacture units that are used under rough conditions Conditions are suitable and due to their encapsulation are protected against contamination.

With the development of the invention according to claim 8 is achieved that the position of the scraper part the supporting part is measured twice, so that one receives higher security.

The development of the invention according to claim 9 has the advantage that the force sensor is removed from places are arranged, which are stripped with from the twist drill Drillings come into contact.

With the development of the invention according to claim 10 will automatically adjust the relationship between Pulling speed and speed of rotation of the Received Erdbohrers on the slope of his spiral rib.

The development of the invention is according to claim 11 again with a view to increased security of the Readjustment of the relationship between drawing speed and speed of rotation of the earth auger is an advantage.

It is prevented according to claim 12 that small Depositing the scraper part from its desired basic position, that are averaging in shorter periods of time can lead to control cycles.

According to claim 13 sets for larger deviations Actual position of the stripping part from its desired basic position a proportional control cycle in progress.

With the development of the invention according to claim 14 is achieved that the stripping device already in that axial area of the auger can work, which lies within the drive pipe for the drill pipe. The stripping of the drilling material is thus carried out on one particularly low-lying place and the stripped Drilled material is delivered in a precisely defined direction, which is predetermined by the access opening.

With the development of the invention according to claim 15 is achieved that the drive tube with respect to the transmission of torque and the transmission of oppressive and pulling forces on the drill pipe just as resilient is like a pipe made of comparable pipe material Drive tube that has no access opening.

A scraper device as specified in claim 16 has a particularly compact structure and the drive tube and the scraper can be combined easy to handle. It also ensures that the Scraper and the drive tube in to the axis of the drive tube parallel to each other are set so that in this direction no adjustment is necessary to the scraper to activate. Another advantage of further training of the invention according to claim 16 is that Support part in turn part of the access opening can represent adjacent reinforcement structure. This reinforcement caused by the support member is also special effective, since the supporting part is in the area the access opening is located and bridged this mechanically.

The development of the invention according to claim 17 ensures good transmission of forces and torques from the supporting part to fixed parts of the drilling machine.

With the development of the invention according to claim 18 becomes a particularly simple guidance of the supporting part guaranteed between working position and rest position. This guide also builds particularly compact and is special inexpensive.

With the development of the invention according to claim 19 it is possible to switch the support part between Working position and rest position without intervention from To manage personnel.

The development of the invention according to claim 20 allows it a driver of the drill who has no or insufficient visual contact with the scraper has to safely determine when he has the stripper unobstructed through the access opening of the drive tube can move.

With the development of the invention according to claim 21 is achieved that the leader of the drill, himself poorly recognizable with good visual contact to the drive tube can, like the helix rib of the earth auger regarding the Scraper part stands, can determine when a space between adjacent courses of the spiral rib Scraper part faces so that this between these gears can be swung in freely.

The development of the invention according to claim 22 enables it, the scraper part with a tight fit between the flanks of the corridors of the spiral rib run towards leave without excessive wear of the spiral rib or high frictional engagement between the wiping part and spiral rib occurs.

The wear material specified in claim 23 is in With regard to resilient properties, friction and wear particularly advantageous.

The development of the invention according to claim 24 is with a view to easy replacement of the wear material and reliable connection of the same with the Scraper part an advantage.

The developments of the invention according to claim 25 or 26 allow the wear plates to be readjusted axial or radial wear. The wear plates are therefore not only worn in an edge area.

You can according to a wear plate geometry Claim 27 even after adjusting the wear plates the central helical rib support shaft of the earth auger Free of any attached drillings without interruption.

According to claim 28 there are extensions Wear plates particularly material-saving, in particular, if they cut lengthwise by cutting a rectangular blank a double angled dividing line are made.

Figur 1:

eine seitliche Ansicht eines Teiles eines Doppelkopf-Bohrgerätes, teilweise geschnitten;

Figur 2:

eine vergrößerte seitliche Ansicht eines Bohrrohr-Antriebsrohres mit integrierter Abstreifeinrichtung, welches Bestandteil des in Figur 1 gezeigten Bohrgerätes ist;

Figur 3:

ein Blockschaltbild einer Hauptsteuerung für verschiedene Antriebsmotoren des in Figur 1 gezeigten Bohrgerätes;

Figur 4:

ein Blockschaltbild einer Regeleinrichtung, mit welcher die Zieh- und Drehgeschwindigkeit des Erdbohrers des in Figur 1 gezeigten Bohrgerätes gemäß der Steigung der Wendelrippe des Erdbohrers nachgeregelt wird;

Figur 5:

eine ähnliche Ansicht wie Figur 2, in welcher jedoch eine abgewandelte Abstreifeinrichtung gezeigt ist;

Figur 6:

eine ähnliche Ansicht wie Figur 2, in welcher eine nochmals abgeänderte Abstreifeinrichtung wiedergegeben ist; und

Figur 7:

eine Aufsicht auf einen Verschleißplattenrohling, aus dem sich zwei Verschleißplatten mit parallel zur Achse des Erdbohrers verlaufenden Verlängerungen herstellen lassen.

The invention is explained in more detail below on the basis of exemplary embodiments. In these it is assumed that the earth auger has only a single helical rib and this is freed of stuck drill material by a single stripping part. It goes without saying that a plurality of stripping parts can also be used for this purpose, which engage at different points between the gears of the helical rib. A plurality of stripping parts are also used to clean an earth auger which has a plurality of helical ribs, at least one of which engages in each of the two sets of spaces which are delimited by the two helical ribs. The drawing shows:

Figure 1:

a side view of part of a double-head drill, partially sectioned;

Figure 2:

an enlarged side view of a drill pipe drive pipe with integrated stripping device, which is part of the drilling device shown in Figure 1;

Figure 3:

a block diagram of a main controller for various drive motors of the drilling device shown in Figure 1;

Figure 4:

a block diagram of a control device with which the pulling and rotating speed of the earth drill of the drilling device shown in Figure 1 is readjusted according to the slope of the helical rib of the earth drill;

Figure 5:

a view similar to Figure 2, but in which a modified stripping device is shown;

Figure 6:

a view similar to Figure 2, in which another modified stripping device is shown; and

Figure 7:

a supervision of a wear plate blank, from which two wear plates with extensions running parallel to the axis of the earth auger can be produced.

In Figure 1, 10 is a leader of a drill. On this are a lower drive head 12 with a carriage 14 and an upper drive head 16 slidable with a carriage 18.

On the carriage 14 is a point of an endless wire rope 20 attached, which over leader-fixed pulleys 22, 24 revolves over the not shown in the drawing transverse bearing parts on the upper or lower End of leader 10 are moored. The lower pulley 22 is driven by a hydraulic motor 26.

Similarly, a point on the carriage 18 is an endless one Fixed wire rope 28, which over leader-fixed pulleys 30, 32 runs, which in practice to the pulleys 22, 24 are coaxial and have the same bearing parts are connected to the leader 10, but here too Explanatory purposes as the side opposite the pulleys 22, 24 are shown offset. The lower one Deflection roller 30 is driven by a hydraulic motor 34.

In the carriage 14 is the upper end of a drive tube 36 via an axial / radial bearing. At the upper end a sprocket 37 is attached to the drive tube 36. An output pinion 38 of a hydraulic motor works on these 40.

The hydraulic motor 40 is provided with an angle sensor 42, this one not shown in the drawing reducing input gear, the Gear ratio the gear ratio between corresponds to the output pinion 38 and the ring gear 37, so that the angle encoder 42 is clearly the angular position of the ring gear 37 associated output signal.

The drive tube 36 is designated with a total of 44 Boring material stripping device provided, the further is explained below with reference to Figure 2. At the lower end of the drive tube 36 is the upper one End of a drill string 46 releasably attached.

A total extends through the drill pipe string 46 with 48 marked earth drill, which has a central core rod 50 and a spiral rib carried by it 52 has.

The auger 48 is at its top in the drawing broken end with the lower one in the drawing also not visible end of a Kelly rod 54 connected, the square cross-section in a known manner has and a central complementary drive opening 56 penetrates a drive pulley 58, the is axially and radially supported in the upper carriage 18.

The drive disk 58 has a ring gear 60, which with the output pinion 62 of a hydraulic motor 64 meshes. The latter is coupled to an angle transmitter 66 which has a reduction gear on the input side, the Gear ratio the reduction ratio between Output pinion 62 and gear ring 60 corresponds, so that the output signal of the angle encoder 66 is unique Function of the angular position of the drive pulley 58 and thus the earth auger 48.

For lifting and lowering the Kelly rod 54 and thus of the earth auger 48, a wire rope 68 is provided, which around leader-fixed pulleys 70, 72 to one at the bottom At the end of the leader provided leader-proof rope drum 72 runs. The latter is driven by hydraulic motor 74.

For measuring the vertical position of the auger 48 is a multi-speed coupled with the hydraulic motor 74 Angle encoder 76 provided, the output signal thus a clear measure of the vertical position of the auger 48 is.

As can be seen from the drawing, in particular FIG. 2, the drive tube 36 has one formed in its peripheral wall Access opening 78, which is in process approximately has the shape of a rectangle. The long axis this rectangle runs parallel to the longitudinal axis of the Drive tube 36.

A wiping part is through the access opening 78 80 movable. This has the axis of the drive tube 36 parallel dimensions smaller than that Incline of the helical rib 52. On the stripping part 80 a wear plate 81 fastened by means of screws 83. It has an edge contour that in the surface of the stripping part 80 taken cross section of the space 82 is closely matched so that the wear plate 81 with a narrow clearance fit or slightly larger sliding fit runs in the space 82. That way the flanks of the spiral rib 54 and the lateral surface of the Core rod 50 cleaned well.

The wear plate 81 consists of a material, in particular a plastic material that is softer than the material or materials. from which of the Erdbohrer 48 is made. Furthermore, the wear material in terms of a certain elasticity and in terms of to low friction on the materials of the earth auger the intended operating temperatures selected. Matedie these requirements at reasonable cost wearing are, in particular, elastomeric crosslinking polyurethanes, such as that under the trade name Vulkollan available plastic material.

The stripping part 80 has at its outer end a guide section 84 which has a central square Cross-sectional guide recess 86 is provided This runs in sliding play on one support bar 88 having a square cross section, the ends of which are formed as stub shafts and in an upper bearing sleeve 90 and a lower bearing sleeve 92 of the drive tube 36 are rotatably mounted. The bearing sleeves 90 and 92 are on an upper reinforcement ring 94 of the drive tube 36 or two spaced lower reinforcing rings 96, 98 of the Drive tube 36 welded.

Between the top face of FIG Guide section 84 and the underside of the bearing sleeve 90 is a compression spring 98, wherein the upper end with the interposition of a force sensor 100 is supported on the underside of the bearing sleeve 90.

Is similar between the bottom of the guide section 84 and the top of the bearing sleeve 92 a force sensor 102 arranged over which the lower end of a compression spring 104 is supported on the bearing sleeve 92, the upper one End engages on the underside of the guide section 84.

The bearing sleeve 92 has two axially spaced locking openings 108, in a working position of Support rod 88 with not shown in the drawing Locking openings in the lower stub shaft section of the support rod 88 are aligned so that these via locking pins 110 lockable in said working position is.

At an angle to the locking holes 108 are further locking openings in the bearing sleeve 106 provided in the drawing are not reproduced, the angular offset so is chosen that the stripper 80 completely outside the inner surface of the drive tube 36 is when the Align the locking openings of the holding rod with them. By locking pins 110 can thus Support rod 88 and stripper 80 in a rest position be locked.

For additional reinforcement of the drive tube 36 in the vicinity of the access opening 78 are on the Drive tube 36 in the vicinity of the longitudinal edges of the Access opening in the axial direction and at the same time reinforcing ribs lying in a radial plane 112 welded. Another compensation by the access opening 78 unilaterally created weakening of the drive tube 36 is provided by the support rod 88.

The two compression springs 98, 104 tension the stripping part 80 in a basic position, as shown in the drawing is reproduced. The axial dimension of the access opening 78 is a multiple of the axial extent of the stripping part 80, so that this is in its Working position in the axial direction downwards or can move up if the ratio between the speed at which the auger 48 passes through the wire rope 68 is pulled up and the speed, with which the auger 48 is rotated when pulled is not exactly the slope of the spiral rib 52 corresponds.

The stripping device shown in Figures 1 and 2 from in the spiral rib spaces between the earth auger 48 stuck drilling works as follows:

For drilling the stripping part 80 is in its outside the rest of the inner surface of the drive tube 36 moves so that the auger 48 in the drive tube 36 can rotate freely. By applying pressure medium of the hydraulic motor 34, the earth drill 48 is in the ground pressed in, the at the same time by the Hydraulic motor 64 is rotated. That from the drill tip loosened soil is absorbed between the spiral ribs. If it doesn't get stuck there, it can partially conveyed upward by the spiral rib 52 become and fall out through the access opening 78.

When the auger 48 advances a certain distance or synchronized with the advance of the earth auger 48, the drive tube 36 through the hydraulic motor 40 rotated and at the same time by pressure medium of the hydraulic motor 24 pressed down, whereby the drill string 46 is pushed further into the ground becomes.

If the helical rib 52 of the earth auger 48 becomes blocked, e.g. through cohesive earth, and therefore the earth drill must 48 pulled up for cleaning, or the auger 48 becomes after completion of a borehole pulled upwards, so the scraper 44 activated, for which purpose the locking pins 110 from the rest position locking openings (in the Drawing not reproduced) and the stripper 80 together with the support rod 88 is given away until the stripping part 80 fully between two adjacent gears of the helical rib 52 are introduced is. In this working position is by insertion the locking pins 110 into the locking holes 108 the stripping part 80 in the pivoting direction fixed, but it continues in the longitudinal direction of the Support rod 88 against the force of the compression springs 98, 104 can be moved up or down.

The driver of the drill now sets the rope drum 72 by pressurizing the hydraulic motor 74 in the sense of winding the wire rope 68 in Movement and rotation of the auger 48 by pressurization of the hydraulic motor 64 against the at Drilling uses direction, with pressurization of hydraulic motors 64 and 74 on top of each other are matched that the ratio of speeds corresponds to the slope of the helical rib 52. Under such ideal conditions, the scraper part can then 80 without contact with the flanks of the spiral rib 52 soil clear 82.

In practice, such an ideal coordination of Drawing speed and speed of rotation of the earth auger not reachable. Rotates as a result of such Mismatch of the two speeds of the Earth drill 48 too slow, so the stripping 80 compressing the upper compression spring 98 upwards moves as it passes through the top of the helical rib 52 is taken away. Is the speed of rotation of the earth auger 48, on the other hand, is too large, the scraper part 80 by axial entrainment through the underside of a Ganges of the helical rib 52 against the force of the compression spring 104 moved down.

The operator of the drilling device places it at the beginning of the stripping process the drive tube 36 in such an angular position, that it is the guide portion 84 of the stripping member 80 from the cab of the excavator chassis carrying the drill can see well, so is the display pin-like Movement of the guide section 84 on the Support rod 88 directly a measure of the speed mismatch, and the leader of the drill can either by changing the pressure medium applied to the hydraulic motor 74 or by changing the pressure medium pressure of the hydraulic motor 64, the stripping part 80 move again in the direction of the desired basic position.

This readjustment of the speed ratio can also be done automatically, as below is described in more detail.

In the upper part of Figure 3 is part of the control device reproduced for the scraper device, with which the Aritiebsrohr 36 automatically placed is that its access opening 78 is so that the Scraper part 80 freely inside the drive tube 36 or can be pivoted out of this.

The angle encoder 42 has one input of a trigger comparator 114 connected. Its second entrance receives from a setpoint device shown as an adjustable resistor 116 a target angle signal, as in that Position of the drive tube 36 provided by the angle sensor 42 in which the stripping part 80 is free pivoted between working position and rest position can be as described above.

The output signal of the trigger comparator 114 becomes via a power amplifier 118 to the control terminal of a 4/2 solenoid valve 120. This is (additional to the other control valves for direction of rotation and speed) in working lines 122, 124 inserted, which lead to the hydraulic motor 40. To this Way, the hydraulic motor 40 is automatically stopped, if the drive tube 36 which for pivoting the Scraper part desired angular position reached. Under Normal conditions, the solenoid valve 120 is in the open position biased, and trigger comparator 114 is only active when an activation switch 126 is closed, what by the leader of the drill Activation of the stripping device takes place in each case.

This is the drive tube 36 for a stripping cycle also automatically hydraulic in its angular position locked.

In the middle part of Figure 3 is a control part shown, which serves the earth auger 48 automatically to be placed in such a position the scraper part 80 freely between adjacent gears the helical rib 52 can be pivoted.

This is also done by closing the activation switch 126 switched on computing circuit 128 provided, the example shown with the output the angle encoder 66, the angle encoder 76 and two further angle encoder 130, 132 is connected to the Hydraulic motors 34 and 40 are coupled. Also the the latter angle encoders are multi-turn angle encoders, which thus unambiguous output signals for the location of the Give drive heads 12 and 16.

The arithmetic circuit 128 also receives an adjustable one Resistance shown setpoint generator 134 an output signal, which specifies an earth drill nominal position, in which the stripping part 80 between courses of the helical rib 52 fits.

The arithmetic circuit 128 calculates from the output signals the angle encoder 76, 130 and 132 that angular position of the auger 48, in which at the given position of the two carriages 14 and 18 adjacent courses of the Helical rib 52 just symmetrical with respect to the stripping part 80 lie. This angle of rotation of the earth auger 48 reached, as on the output signal of the angle encoder 66 recognizable, the computing circuit 128 generates an output signal, which via a power amplifier 136 given the control terminal of a 4/2 solenoid valve 138 that is in working lines 140, 142 of the hydraulic motor 64 is switched. In this way, the earth auger is made stopped reaching the target position.

It is understood that, in a modification of the above Embodiment also the computing circuit 128 can program so that it is at a given angular position the vertical position of the same calculates the two gears of the helical rib 52 stand symmetrically to the stripping part 80. In this case is then the solenoid valve 138 in the working lines of the Hydraulic motor 74 switched. Either way the desired orientation of the auger 48 on the stripping part 80. In the lower section of FIG 3 is a schematic readjustment for the ratio between pulling speed and rotating speed of the auger 48 according to the pitch of the helical rib 52 shown.

After a period of time necessary for the changeover of the stripping section is sufficient, the computing circuit is deactivated staying until its activation clamp again receives a rising signal edge.

The output signals of force sensors 100, 102 are included connected to the two inputs of a control circuit 144, which explained in more detail with reference to Figure 4 is and works on an actuator 146, the one Throttle 148 (or dashed indicated two synchronously moving chokes 148, 150) which moves into the control line for the hydraulic motor 64 are inserted.

Again, you can alternatively adjust the speed at constant speed of the hydraulic motor 64 by connecting the hydraulic motor 74 to the control circuit 144 accomplish that then marginally is programmed differently.

The earth auger is preferably positioned 46 as well as the speed adjustment according to the slope of the helical rib 52 by changing the pressure medium supply to the hydraulic motor 64, so that the solenoid valve 138 and the controllable throttles 148, 150 inserted in series in the same work lines are.

The control circuit 144 sets the chokes 148, 150 in the position of maximum opening if there is no activation signal receives.

As can be seen from FIG. 4, the force sensors 100 are 102 with inputs of radio modem parts 152, 154 connected, which modulates RF signals according to the input signals Deliver to antennas 156, 158. The so emitted Measured values are collected by antennas 160, 162 which with arranged on the vehicle carrying the drill Radio modem parts 164, 166 are connected. The Outputs of the latter are with first input terminals connected by error signal circuits 168, 170. Get this at second inputs of shown as adjustable resistors Setpoint generators 172, 174 signals that the upper Specify the limit or lower limit of a window, within the stripping part 80 against the force of Compression springs 98, 104 may be movable without one Readjustment of the relationship between drawing speed and speed of rotation of the earth auger 48.

The error signal circuits 168, 170 operate in dependence from a characteristic curve 176, which is a sectional view is reproduced from Figure 4, the error signal E over the difference D between the two Input signals is shown. The characteristic curve 176 has a middle plateau 176a of width 2T (T = tolerance value for control), within which no error signal is provided, and close to this branches 176b and 176c of the Characteristic.

The output signal of the error signal circuit 168 becomes to the one input terminal of a control circuit 178 given that at its second input terminal via a Inverter 180 the output signal of the error signal circuit 170 receives. The control circuit 178 adds its two Input signals and applied with the thus obtained Sum over a performance level not shown in detail the clockwise or counterclockwise clamp of the Actuator 146.

In this way, the stripper 80 can the earth auger 48 completely clean it without touching the top edges the access opening 78 abuts.

In the modified starting examples according to the figures 5 and 6 are components referenced above on Figures 1 and 2 have already been explained again provided with the same reference numerals. These components are not described again in detail below.

The support rod 88 is now in the embodiment Figure 5 mounted on a plate 182 from the bottom of the carriage 14 is worn. On an upper one End portion of the support rod 88 is a crank arm 184 attached, the articulated with the end of a piston rod 186 of a double-acting hydraulic cylinder 188 connected is. The latter is also from the bottom of the carriage 18 worn and so the stripping Swivel 80 between work position and rest position. Has a control valve 190 for the hydraulic cylinder 188 a closed middle position in which the hydraulic cylinder 188 is locked hydraulically.

In this way, there is no need to change the locking pins 110 and the activation and deactivation of the Scraper can be under automatic positioning access port 178 and auger 48 as above described with reference to FIGS. 3 to 4, overall done automatically, with activation of the hydraulic cylinder 188 in the sense of moving the Scraper part 80 from the rest position to the working positions occurs when at the output of the two error signal circuits 168, 170 there is no error signal and additionally a signal at the output of the computing circuit 128 pending. An AND gate 192 is provided for this purpose on the input side with the aforementioned signals is and via a power amplifier 194 on one Solenoid of the 4/2 solenoid valve 190 works. Of the second actuating magnet is replaced by the inverted (196) Output signal of the activation switch 126 via a another power amplifier 198 excited.

In the embodiment of Figure 5 is also in place the wear plate 81 a wear strip 81 'is provided which is firmly attached to the edge of the stripping part 80, e.g. is glued.

The further modified embodiment according to the figure 6 differs from that according to FIG. 5 on the one hand in that the plate 182 with the carriage 12th connected horizontal perpendicular to the plane of the drawing spaced guide rails 200 through the hydraulic cylinder 188 is displaceable, with the support rod now 88 is firmly connected to the plate 182. The displacement route the plate 182 is so large that the stripping part 80 again from a working position adjacent to the core rod 50 into an outside of the clear contour of the drive tube 36 lying rest position is movable.

Furthermore, two wear plates are instead of the wear plate 81 81'a and 81'b provided that in new condition together have the same edge contour as the wear plate 81, i.e. correspond to half of the latter. Your mounting screws 83 run in guide slots 85, which are inclined obliquely. The run Guide slots 85 for the upper wear plate 81'a upwards and radially inwards and parallel below each other, while the parallel guide slots 85 for the lower wear plate 81'b downwards and radially run inwards. The tangent of their angle of attack corresponds to the ratio between axial and radial Wear of the wear plates.

In this way, the wear plates can wear be re-enacted, which is simply accomplished on site can be, so that there are not constantly replacement wear plates must be kept. Here will also be a larger proportion of the wear plates educational Mareriales used as intended and you can continuously under essentially constant stripping conditions work.

That the radially inner edge of the wear plate assembly with increasing adjustment of the wear plates no longer going through is acceptable for many missions, where not very cohesive soil is drilled is because the drilling material due to the small diameter of the Core rod 50 adheres less well than the less curved Flanks of the spiral rib.

Since in the exemplary embodiments according to FIGS and FIG. 6 the force sensors 100, 102 on a fixed one Partly arranged, they can be directly via lines 202, 204 are connected to the control circuit 144, so that the modem parts 148 to 154 can be omitted.

If one wishes with reference to FIG. 6 above described adjustment option for the two wear plates also a constant cleaning of the Core rod 50, you can see the one shown in Figure 7 Give geometry:

The wear plates 81''a and 81''b shown there have a main section 206 of the wear plate 81'a or 81'b corresponds to the main section 206 one (radially on the inside when installed and Extension pointing axially to the center of the stripping part 80) 208 molded.

According to FIG. 7, the extensions 208 extend over half the radial extent (longitudinal edge) of the main sections 206 of wear plates 81''a and 81''b. This can be made from a rectangular (here square) Generate plate blank in a material-saving way, that it is point symmetrical to the center of the blank double angled dividing line 210.

The lower wear plate obtained by such cutting is ^o rotated about the vertical axis in Figure 7 means 212 of the blank 180, in order to bring them into their installation orientation.

Of the wear plates 81''a shown in FIG and 81''b becomes one on one side the other attached to the other side of the stripping part 80. This allows their extensions 208 to be in new condition overlap more axially and most re-adjusted Overlap the condition slightly axially (or possibly also slightly no longer overlap), so that during the a satisfactory wiping effect over the entire service life also receives for the lateral surface of the boring bar 50.

Due to the slight displacement of the two wear plates 81''a and 81''b will not be a significant impairment the stripping effect on the flanks of the helical rib 52 and the outer surface of the core rod 50 are obtained.

Claims (28)

Device for removing drillings from the gaps (82) between adjacent aisles a helical rib (52) of an earth auger (48), with at least one stripping part (80), which between a stripping part working position engaging in the intermediate spaces (82) and one outside the light Contour of the earth drill (48) lying scraping rest position is relocatable, characterized in that the scraper part (80) slidably but non-rotatably a support member (88) is arranged, which is in essentially parallel to the axis of the earth auger (48) extends and in turn between a supporting part working position, in which the scraper part (80) in the Intermediate (82) engaging stripping part working position occupies, and a supporting part rest position shiftable is in which the scraper part (80) the outside the clear contour of the earth auger (48) Scraper part rest position. Device according to claim 1, characterized in that the scraper part by a spring arrangement (98, 104) in an axially central basic position on the Support part (88) is biased. Device according to claim 2, characterized in that the scraper part (80) by two biasing springs (98, 104) is biased into the basic division, which on the two boundary surfaces in the direction of movement of the stripping part (80) and these opposite Stop faces of the support member (88) or one attack the latter bearing part (90, 92). Device according to one of claims 1 to 3, characterized characterized in that the support member (78) a Pole with a non-round, in particular polygonal cross-section and the scraper part (80) is one in sliding play this rod has a running guide recess (86). Device according to one of claims 1 to 3, characterized characterized in that the support member (80) two spaced circular cross-section supporting rods has and the scraper part with two guide holes is provided, which in the sliding play on the Leaders run. Device according to one of claims 1 to 5, characterized by a cooperating with the stripping part (80) Position measuring device (100, 102), which is the actual position of the stripping part (80) on the support member (88) assigned position signal. Device according to claim 6 in conjunction with claim 2, characterized in that the position measuring device at least one force sensor (100, 102) has, the mechanically in series with the spring arrangement (98, 104) is switched. Device according to claim 7 in conjunction with claim 3, characterized in that two force sensors (100, 102) are provided, each of which is one of the are assigned to two biasing springs (98, 104). Device according to claim 7 or 8, characterized in that the force sensor (100, 102) each between a spring seat remote from the stripping part (80) and the adjacent end of the associated Preload spring (98, 104) are arranged. Device according to one of claims 6 to 9, characterized by a control device (144) for a drive unit working on the twist drill (48) (60; 74)) for rotating or axially moving the Twist drill (48), which has a setpoint device (172, 174) for a desired middle basic position of the scraper part (80) on the supporting part (88) shows us as the actual position signal the output signal of the measuring device (100, 102). Device according to claim 10 in connection with Claim 8, characterized in that the control device (144) two error signal circuits (168, 170) which has a first or second setpoint signal for an upper or lower limit of a target position range and the output signal of the first or second the force sensor (100, 102) is acted upon and their output with input terminals of a control circuit (178) are connected, depending on the output signals of the two error signal channels (168, 170) the power supply of the considered working on the earth auger (48) Drive (64) controls such that the stripping part (80) is moved to the home position. Device according to claim 11, characterized in that the error signal circuits (168, 170) have no output signals deploy if the difference between the two input signals given to them are smaller is as a predetermined tolerance value (T). Device according to claim 12, characterized in that the error circuits (168, 170) when the Difference between the two signals given to them is greater than the tolerance value (T) one to the difference between the lower eye (D) and the tolerance value (T) Provide proportional error signal (E). Device according to one of claims 1 to 13, characterized in that the supporting part (88) next to a drive pipe (36) for a drill pipe (46) through which the earth auger (48) extends, and that the drive tube (36) has an access opening (88) through which the stripping part (80) can be freely pivoted and its axial dimension is at least equal to the adjustment of the stripping part (80) on the Support part (88) is. Device according to claim 14, characterized in that the drive tube (36) is preferably a Access opening (88) adjacent reinforcement structure (112). Device according to claim 14 or 15, characterized in that the support member (88) on the drive tube (36) is stored. Device according to one of claims 1 to 16, characterized in that the support member (88) in lockable in its working position (108, 110; 188, 190) is. Device according to one of claims 1 to 17, characterized in that the support member (88) around its longitudinal axis is pivotable. Device according to claim 17 or 18, characterized in that that the support member (88) by a lockable (190) servomotor (188), in particular a hydraulic cylinder in its working position and its resting position can be locked. Device according to one of claims 14 to 19, characterized by one with the drive tube (36) collaborating or working on it Rotary drive (40) cooperating zero position detector (42, 114, 116) which is then an output signal created when the access opening (78) to the support member (80) faces in such a way that the stripping part (80) is free is movable through the access opening (78). Device according to one of claims 1 to 20, characterized by one with the earth auger (48) or a drive (64) working on this Zero position detector (66, 76, 128, 130, 132, 134), which generates an output signal when the access opening (78) faces the supporting part (88) in such a way that the scraper part (80) freely through the access opening (78) is movable. Device according to one of claims 1 to 21, characterized in that at least one edge region of the scraper part (80) consists of a wear material. Device according to claim 22, characterized that the wear material is a plastic material, in particular a rubber-elastic cross-linking polyurethane. Device according to claim 22 or 23, characterized in that the wear material Edge area through the edge area one made of the wear material manufactured wear plate arrangement (81; 81 ''; 81 '' ') is formed, which is detachable with the stripping part is connected and survives this. Device according to one of claims 22 to 24, characterized characterized in that the wear plate assembly by two wear plates (81''a, 81''b; 81 '' 'a, 81' '' b) is formed with parallel to the axis of the Erdbohrers (48) running opposite component the scraper part (80) guided (83, 85) are adjustable. Device according to claim 25, characterized that the two wear plates (81''a, 81''b; 81 '' 'a, 81 '' 'b) with a perpendicular to the axis of the auger (48) component in the same direction on the stripping part (80) are slidably guided (83, 85). Device according to claim 25 or 26, characterized in that the wear plates (81''a, 81''b; 81 '' 'a, 81' '' b) on different sides of the stripping part (80) are attached and each in the axial direction of the Earth auger (48) have larger dimensions than half the dimension of the stripping part (80) in this direction corresponds. Device according to one of claims 25 to 27, characterized characterized that the wear plates (81 '' 'a, 81' '' b) at the radially inner end of their Center line of the stripping part (80) facing edge in each case one running parallel to the axis of the earth auger (48) Extension (208), which are in radial direction, preferably over half of this Edge, extends.

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