Drilling device and method for screwing drill rod elements to a drilling device

Abstract

A drilling device having a drill drive, a positioning means, a receiving part, a clamping means, and a control unit. The receiving part holds a first drill rod element with a first thread region. The clamping means is positioned on the drill drive for holding at least a second drill rod element having a second thread region. The control unit actuates the drill drive and the positioning means to screw the first and second thread regions together. A distance measuring means detects an adjustment distance of the drill drive along a guide as an actual value. The control unit determines an adjustment distance as a nominal value from a detected revolution speed of the drill drive during screwing and a predetermined thread constant. The control unit determines a difference from the nominal and actual values, and uses the difference to adjust the drill drive and/or the positioning means.

Claims

1. A drilling device having a drill drive configured to drive drill rod elements in a rotating manner and is linearly adjustable along a guide, the guide being a mast, a positioning means for linear adjustment of the drill drive, a receiving part configured to receive and hold at least a first drill rod element with a first thread region, a clamping means configured to hold at least a second drill rod element with a second thread region which can be screwed so as to fit to the first thread region, the clamping means being arranged on the drill drive, and a control unit, by which the drill drive and the positioning means can be actuated in order to screw together the first thread region and the second thread region, wherein a distance measuring means is provided, by which an adjustment distance of the drill drive along the guide can be detected as an actual value, by the control unit a revolution speed of the drill drive during screwing can be detected and, on taking account of a predetermined thread constant, an adjustment distance can be determined as a nominal value, by the control unit a comparison of the nominal value and the actual value can be carried out and a difference value can be determined and the drill drive and/or the positioning means can be adjusted by the control unit according to the difference value determined.

2. The drilling device according to claim 1, wherein the positioning means has at least one positioning cylinder and/or a rope winch.

3. The drilling device according to claim 1, wherein the thread constant comprises a thread pitch or a lead.

4. The drilling device according to claim 1, wherein the control unit has an input station for the input of data, in particular the thread constants.

5. The drilling device according to claim 4, wherein the input station has a display, on which possible thread constants can be shown.

6. The drilling device according to claim 1, wherein a means for automatic detection of the thread constants is provided.

7. A method for screwing drill rod elements with the drilling device according to claim 1, comprising: driving, using the drill drive, drill rod elements in a rotating manner, the drill drive being displaced linearly along the guide, linearly adjusting the drill drive using a positioning means, receiving and holding, using the receiving part, at least the first drill rod element with the first thread region, holding, using the clamping means, at least the second drill rod element with the second thread region, the clamping means being arranged on the drill drive, wherein, for screwing, the second drill rod element is rotated by the drill drive, and actuating, using the control unit, the drill drive and the positioning means in a controlled manner, wherein the first thread region and the second thread region are screwed together.

8. The method according to claim 7, wherein a rotational speed, a direction of rotation and/or a revolution speed of the drill drive is adjusted until the actual value corresponds to the nominal value.

9. The method according to claim 7, wherein the positioning means is displaced linearly along the guide until the actual value corresponds to the nominal value.

10. The method according to claim 7, wherein the drill drive and the positioning means are actuated in a coordinated manner such that on the first thread region and the second thread region a load and/or friction occurs.

11. The method according to claim 7, wherein the screwing comprises an establishment and/or release of a threaded connection between the first thread region and the second thread region.

Description

(1) The invention is described further hereinafter by way of a preferred embodiment which is set out further in the following in conjunction with the drawings, wherein show:

(2) FIG. 1 a schematic side view of a drilling device according to the invention and

(3) FIG. 2 an enlarged detailed view of an input station of the drilling device of FIG. 1.

(4) According to FIG. 1 a drilling device 10 pursuant to the invention has a carrier vehicle 11, in the rear region of which a vertically erectable mast 14 is provided. On its free side facing away from the carrier vehicle 11 the mast 14 has a linear guide 16, along which a carriage 15 with a drill drive 12 is arranged. By means of a positioning means 30 the carriage 15 can be displaced linearly along the guide 16 of the mast 14. For this purpose, the positioning means 30 has a rope winch 32 for a rope 34. The rope 34 is guided from the rope winch 32 on the carrier vehicle 11 via a deflection pulley 36 at the head of the mast 14 up to the carriage 15.

(5) On a lower end region of the mast 14 a receiving part 20 with a clamping cylinder is provided, by which a first drill rod element, not depicted, partially drilled into the ground, can be held and clamped axially and in a torque-proof manner. Furthermore, on the drill drive 12 a clamping means 13, more particularly a clamping chuck, is provided in a known manner, on which a further second drill rod element is held and clamped in a torque-proof manner on the drill drive 12. On the respective free end regions of the tubular or bar-shaped drill rod elements matching thread regions are provided, with which the drill rod elements can be connected to each other.

(6) To screw together the first and second drill rod elements a control unit 50 is preferably arranged in the rear region of the carrier vehicle 11. The control unit 50 is shown partially enlarged in FIG. 2, wherein it has an input station 52 with a display 54.

(7) Initially, by means of the control unit 50 the drill rod element clamped on the drill drive 12 is displaced downwards until it makes contact with the clamped first drill rod element in the receiving part 20. In doing so, the two opposite thread regions on the drill rod elements are brought into contact. By the control unit 50 the upper second drill rod element is set into rotation, whereby the thread region of the second drill rod element is screwed into the matching thread region of the lower first drill rod element. Depending on a known thread constant, which was entered into the control unit 50 by the operator using the input station 52 or done automatically, the revolution speed of the drill drive 12 during screwing is measured by the control unit and through this an axial adjustment distance of the drill drive 12 is determined by calculation.

(8) At the same time, on the drilling device according to the invention the actual adjustment distance of the drill drive 12 along the guide 16 is measured during screwing as an actual value by a distance measuring means, not depicted in greater detail, which is fixed on the mast 14. In the control unit 50 a comparison of the measured actual value with the nominal value is effected, with a difference value being determined as the case may be. According to a difference value determined the drill drive 12, i.e. in particular a rotational speed or revolution speed of the drill drive 12, or the positioning means 30, in particular the rope winch 32, can be adjusted and thus controlled by the control unit 50. It is clear that the calculation of the nominal value, the detection of the actual value and the determination of the difference value can take place within differentially small time units so that a constant and therefore very precise and also wear-reduced screwing movement can preferably be accomplished. Corresponding control is also carried out when the screw connection between the two thread elements is released.