Automatic rod replacing device of drilling machine and drilling machine

Abstract

One end of a drill rod of the drilling machine is provided with a first connector, and the other end of the drill rod of the drilling machine is provided with a second connector; the first joints and the second joints of the adjacent drill rods are mutually clamped, so that the adjacent drill rods are connected into a whole; the automatic rod replacing device of the drilling machine comprises a rack serving as a mounting foundation; the clamping assembly is mounted on the rack and used for clamping the drill rod to a target mounting position; the grabbing assembly is used for grabbing the drill rod and driving the drill rod to move between a first position and a second position; when the drill rod is located at the second position, the axis of the drill rod and the clamping center line of the clamping assembly are kept coaxial; the power assembly is provided with a third connector and a position adjusting mechanism; the third joint can be clamped with the first joint or the second joint; the position adjusting mechanism is used for adjusting the position of the third connector so that the third connector can be close to the drill rod at the second position and drive the drill rod to move from the second position to the target installation position, and therefore the rod replacing efficiency can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of drilling rigs, and in particular to an automatic rod changing device for drilling rigs and a drilling rig. Background Art

[0002] In the field of coal mining and geological exploration, the advance drill is a mechanical equipment that drives the drill tool to drill in the designed direction, explore the geological conditions ahead, and obtain physical geological data during coal mining and geological exploration.

[0003] In the related art, the advance drilling rig uses a rotating power head to embrace and clamp the mobile drill rod. The rotating power head is integrated with the drill rod clamping mechanism. The drill rod is raised and lowered behind the power head, and the drill rod is replaced manually. The water injection joint must be replaced every time a drill rod is replaced.

[0004] This structure has the following disadvantages:

[0005] 1) The labor intensity of workers is high;

[0006] 2) High risk factor;

[0007] 3) Low production efficiency;

[0008] 4) Inconvenient maintenance and replacement of parts;

[0009] 5) The service life of the equipment is short. Utility Model Content

[0010] The present application aims to solve at least one of the technical problems existing in the related art.

[0011] To this end, a first aspect of the present application is to provide an automatic rod changing device for a drilling rig.

[0012] A second aspect of the present application is to provide a drilling rig.

[0013] In view of this, according to the first aspect of the present application, an automatic rod changing device for a drilling rig is proposed, wherein a first joint is provided at one end of the drill rod of the drilling rig, and a second joint is provided at the other end; the first joints and the second joints of the adjacent drill rods are clamped together to connect the adjacent drill rods into one; the automatic rod changing device for the drilling rig comprises: a frame as an installation base; a clamping assembly installed on the frame, used to clamp the drill rod at a target installation position; a grabbing assembly, used to grab the drill rod and drive the drill rod to move between a first position and a second position; when the drill rod is located at the second position, the axis of the drill rod and the clamping center line of the clamping assembly remain coaxial; a power assembly, having a third joint and a position adjustment mechanism; the third joint can be clamped with the first joint or the second joint; the position adjustment mechanism is used to adjust the position of the third joint so that the third joint is close to the drill rod in the second position, and drives the drill rod to move from the second position to the target installation position.

[0014] In actual application, the drill rod is moved from the first position to the second position by the grabbing assembly; when the drill rod is located at the second position, the position adjusting mechanism drives the third joint to approach the drill rod and engage with the first joint or the second joint, so that the drill rod and the third joint are fixedly connected as one; at this time, the grabbing assembly releases the drill rod, and the drill rod located at the second position is moved to the target installation position under the action of the position adjusting mechanism, and is clamped by the clamping assembly to complete the rod loading; the rod unloading process is the opposite of the above process and will not be repeated here; the above structure is adopted, so that automatic rod changing can be realized, thereby improving the rod changing efficiency.

[0015] In some technical solutions, the grabbing assembly includes a plurality of manipulators; the manipulators are swingably arranged between the first position and the second position relative to the frame. When the manipulators are located at the first position, the manipulators are used to load and unload the drill rod; when the manipulators are located at the second position, the manipulators are used to clamp the drill rod to connect or separate the drill rod and the third joint.

[0016] Specifically, the manipulator includes: a base mounted on the side of the frame; a rotating seat pivotally connected to the base; a clamping claw connected to the rotating seat; the center line of the clamping claw is kept parallel to the clamping center line of the clamping assembly; the clamping claw has a fixed part and a movable part; a first oil cylinder connected to the rotating seat to drive the rotating seat to rotate, thereby driving the clamping claw to swing between the first position and the second position; a second oil cylinder connected to the movable part, thereby realizing the clamping or releasing of the drill rod by the clamping claw. It has a simple structure and simple control.

[0017] In some technical solutions, an anti-slip structure is provided on the clamping surfaces of the fixed part and the movable part to improve the clamping stability of the drill rod. Exemplarily, the anti-slip structure is a slip.

[0018] In some technical solutions, the clamping jaw is mounted on the rotating seat via a clamping jaw seat; the clamping jaw seat and the rotating seat are detachably connected to facilitate adjustment of the center line of the clamping jaw.

[0019] In some technical solutions, an auxiliary component is also included; the auxiliary component is used to clamp the drill rod and rotate it in the opposite direction by a certain angle when the drill rod cannot rotate during unloading, so as to loosen adjacent drill rods to assist in unloading.

[0020] Specifically, the auxiliary component includes: a rotating clamping mechanism having a clamping portion and a rotating portion; the clamping portion is mounted on the rotating portion; and a rotating driving mechanism is in transmission connection with the rotating portion to drive the rotating portion to rotate. It can be understood that the rotating clamping mechanism is common in the prior art and does not present any difficulty to technicians in the relevant field, and will not be described in detail here.

[0021] In some technical solutions, the first joint is a convex joint; the outer surface of the first joint is provided with an external thread; the second joint is a groove joint; the inner surface of the second joint is provided with an internal thread that matches the external thread of the first joint.

[0022] Wherein, the power assembly further includes a rotating power mechanism; the third joint is in transmission connection with the rotating power mechanism and rotates under the action of the rotating power mechanism to be rotationally engaged with the first joint or the second joint. The structure is simple and easy to process.

[0023] In the above technical solution, the third joint and the output shaft of the rotating power mechanism are connected and fixed via a connecting flange; an axial pin hole is provided on the side of the connecting flange; a pin shaft is provided in the pin hole; and an elastic gasket is provided on the side of the connecting flange facing the third joint.

[0024] In practical applications, transmitting torque through the pin shaft is conducive to uniform force and stronger impact load resistance, thereby avoiding failure of the flange structure and extending the service life of the third joint; at the same time, the elastic gasket can also avoid collision between the drill pipe and the connecting flange, which is beneficial to protecting the drill pipe and the connecting flange.

[0025] In some technical solutions, a linear guide rail extending along the clamping center line direction of the clamping assembly is provided on the frame; the power assembly is movably mounted on the linear guide rail, so that it is only necessary to keep the center line of the third joint and the clamping center line of the clamping assembly coaxially arranged, and the position adjustment mechanism only needs to drive the power assembly to move along the linear guide rail to simplify the structure.

[0026] In some technical solutions, a control component is also included to control the operation of other components. Specifically, the control component includes an inductive sensor. The inductive sensor is used to detect the working state of the target component, and the operation of each component is linked by the control component. This is common in the prior art and does not present any difficulty to technicians in the relevant field, so it will not be described in detail here.

[0027] Automatic rod clamping, rod feeding, rod lifting and other operations can be achieved through control components to improve efficiency. Compared with manual rod changing, it can also reduce labor intensity and labor costs.

[0028] According to a second aspect of the present application, a drilling rig is provided, wherein the drilling rig has the automatic rod changing device for drilling rigs provided in the first aspect of the present application.

[0029] Specifically, the drilling rig includes the drilling rig automatic rod changing device provided by any of the above-mentioned technical solutions, so that the drilling rig has all the beneficial effects of any of the above-mentioned technical solutions, which will not be repeated here.

[0030] Additional aspects and advantages of the present application will become apparent in the following description or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0032] Figure 1 The side view of the automatic rod changing device for a drilling rig in an embodiment of the present application is shown;

[0033] Figure 2 A schematic diagram of the top view of the automatic rod changing device for a drilling rig in an embodiment of the present application is shown;

[0034] Figure 3 A schematic diagram of the structure of an automatic rod changing device for a drilling rig in an embodiment of the present application is shown in an oblique view;

[0035] Figure 4 One of the structural schematic diagrams of the manipulator in the embodiment of the present application is shown;

[0036] Figure 5 The second structural schematic diagram of the manipulator in the embodiment of the present application is shown;

[0037] Figure 6 Shows Figure 1 Schematic diagram of the enlarged structure at point A in the middle.

[0038] in, Figures 1 to 6 The corresponding relationship between the reference numerals and the component names is as follows:

[0039] 100-frame; 110-linear guide;

[0040] 200-grasping assembly; 210-manipulator; 211-base; 212-rotating seat; 213-gripping claw; 2131-fixed part; 2132-movable part; 2133-anti-slip structure; 214-first oil cylinder; 215-second oil cylinder;

[0041] 300-clamping assembly; 310-clamping device; 311-clamping seat; 312-clamping block; 313-driving structure;

[0042] 400-power assembly; 410-third joint; 420-position adjustment mechanism; 430-sliding seat; 440-rotational power mechanism; 450-connecting flange; 460-pin shaft; 470-elastic gasket;

[0043] 500-drill pipe; 510-first joint; 520-second joint;

[0044] 600- auxiliary component; 610- rotating clamping mechanism; 620- rotating driving mechanism;

[0045] 700-target installation position; 800-first position; 900-second position. DETAILED DESCRIPTION

[0046] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0047] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0048] Combine the following Figures 1 to 6 , the automatic rod changing device for drilling rigs and the drilling rig provided in the embodiments of the present application are described in detail through specific embodiments and their application scenarios.

[0049] like Figure 1 , Figure 2 and Figure 3 As shown, some embodiments of the present application provide an automatic rod changing device for a drilling rig, the structure of which includes: a frame 100, a grabbing assembly 200, a clamping assembly 300 and a power assembly 400.

[0050] Specifically, a first joint 510 is provided at one end of the drill rod 500 of the drilling rig, and a second joint 520 is provided at the other end. The first joint 510 of one drill rod 500 and the second joint of another drill rod 500 are clamped together to fix the two drill rods 500 on the axis.

[0051] The clamping assembly 300 is disposed on the frame 100 and is used to clamp the drill rod 500 and fix the drill rod 500 at the target installation position 700, that is, the clamping center line of the clamping assembly 300 and the axis center line of the drill rod 500 at the target installation position 700 remain coaxial.

[0052] The grabbing assembly 200 is used to grab the drill rod 500 and drive the drill rod 500 to move between the first position 800 and the second position 900; wherein, when the drill rod 500 is located at the second position 900, the axis of the drill rod 500 and the clamping center line of the clamping assembly 300 remain coaxial.

[0053] The power assembly 400 has a third joint 410 and a position adjustment mechanism 420. The third joint 410 can be connected to the first joint 510 or the second joint 520; the position adjustment mechanism 420 is configured to adjust the position of the third joint 410 so that the third joint 410 is connected to the drill rod 500 located at the second position 900, and drives the drill rod 500 at the second position 900 to move to the target installation position 700 to complete the rod mounting.

[0054] In actual application, the drill rod 500 is moved from the first position 800 to the second position 900 by the grabbing assembly 200; when the drill rod 500 is located at the second position 900, the position adjustment mechanism 420 drives the third joint 410 to approach the drill rod 500, and engages with the first joint 510 or the second joint 520, so that the drill rod 500 and the third joint 410 are fixedly connected as one; at this time, the grabbing assembly 200 releases the drill rod 500, and the drill rod 500 located at the second position 900 is moved to the target installation position 700 under the action of the position adjustment mechanism 420, and is clamped by the clamping assembly 300 to complete the rod loading; the rod unloading process is the opposite of the above process and will not be repeated here; thereby, automatic rod changing can be achieved and the rod changing efficiency is improved.

[0055] In some embodiments, the gripping assembly 200 includes a plurality of manipulators 210. The manipulators 210 are swingably arranged between a first position 800 and a second position 900 relative to the frame 100; when the manipulators 210 are located at the first position 800, the manipulators 210 are used to load and unload the drill rod 500; when the manipulators 210 are located at the second position 900, the manipulators 210 are used to clamp the drill rod 500 to connect or separate the drill rod 500 and the third joint 410.

[0056] Specifically, Figure 4 and Figure 5As shown, the manipulator 210 includes a base 211, a rotating base 212, a clamp 213, a first cylinder 214 and a second cylinder 215. The manipulator 210 is fixed to the side of the frame 100, and the center line of the plurality of clamps 213 and the axis line of the drill rod 500 located at the target installation position 700 are kept parallel.

[0057] The base 211 is fixed to the side of the frame 100 by bolts so that the center line of the clamp 213 is parallel to the axis line of the drill rod 500 located at the target installation position 700; the rotating seat 212 and the base 211 are pivotally connected; the clamp 213 is installed on the rotating seat 212, including a fixed part 2131 and a movable part 2132; the first cylinder 214 is used to drive the rotating seat 212 to rotate, so as to realize the swing of the clamp 213 between the first position 800 and the second position 900; the second cylinder 215 is connected to the movable part 2132, and is used to realize the clamping and loosening of the drill rod 500 by the clamp 213.

[0058] In actual application, when the clamp 213 swings to the first position 800, the drill rod 500 can be placed in the clamp 213 by a manual or automatic loading device; by adjusting the first oil cylinder 214, the clamp 213 drives the drill rod 500 to swing to the second position 900, so that the clamping center line of the drill rod 500 and the clamping assembly 300 remain coaxial; then, the center line of the third joint 410 and the drill rod 500 are kept coaxial, and the third joint 410 is brought close to the drill rod 500 and clamped with the first joint 510 or the second joint 520 through the position adjustment mechanism 420, so that the drill rod and the third joint are clamped. The head 410 is connected as a whole; at this time, the clamping jaw 213 is loosened by the second oil cylinder 215, and the clamping jaw 213 is swung back to the first position 800 again by the first oil cylinder 214; and the drill rod 500 is moved from the second position 900 to the target installation position 700 by the action of the position adjustment mechanism 420, and is clamped by the clamping assembly 300, thereby completing the rod loading of the drill rod 500; the rod unloading process is opposite to the above process and will not be repeated here; the above structure can realize automatic rod changing, improve the rod changing efficiency, and has a simple structure and control, thereby simplifying the rod changing process of the drilling rig rod changing device.

[0059] In the above embodiment, a detachable clamping jaw seat (not shown in the drawings) is also provided on the rotating seat 212, and the clamping jaw 213 is installed on the clamping jaw seat, so that the center line of the clamping jaw 213 can be adjusted by adjusting the position of the clamping jaw seat.

[0060] In the above embodiment, the clamping surface of the clamping jaw 213 is provided with an anti-skid structure 2133 to improve the clamping stability of the drill rod 500. For example, the anti-skid structure 2133 is a slip; it is understandable that other anti-skid structures, such as rubber pads, anti-skid chains, etc., can also be used, and the present embodiment is not limited thereto.

[0061] In some embodiments, the clamping assembly 300 includes a plurality of clamps 310 . The clamps 310 include a clamping seat 311 , a clamping block 312 , and a driving structure 313 .

[0062] Specifically, the clamping seat 311 is provided with a hollow inner cavity; there are two clamping blocks 312, which are arranged opposite to each other; there are two driving structures 313, which are connected to the clamping blocks 312 one by one to drive the clamping blocks 312 to move relative or toward each other, thereby clamping or releasing the drill rod 500.

[0063] In the above embodiment, the position of the clamping seat 311 is adjustable to accommodate drill rods of different sizes, which is more practical.

[0064] In order to avoid the situation where the drill rods 500 are unable to rotate too much during unloading, thus affecting the normal unloading process, in some embodiments, an auxiliary component 600 is also designed. When the drill rods 500 are unable to rotate, the auxiliary component 600 can clamp the drill rods 500 and rotate in the opposite direction by a certain angle, thereby loosening the drill rods 500 to assist in unloading.

[0065] Specifically, the auxiliary assembly 600 includes a rotary clamping mechanism 610 and a rotary driving mechanism 620. The rotary driving mechanism 620 is connected to the rotary clamping mechanism 610 to drive the rotary clamping mechanism 610 to rotate. In this embodiment, the rotary driving mechanism 620 is a hydraulic cylinder.

[0066] In the above embodiment, the rotating clamping mechanism 610 includes a clamping portion (not shown in the drawings) and a rotating portion (not shown in the drawings); the clamping portion is mounted on the rotating portion. This is common in the prior art and does not present any difficulty to those skilled in the art, so it will not be described in detail here.

[0067] In some embodiments, a linear guide rail 110 extending along the clamping center direction of the clamping assembly 300 is provided on the frame 100. The power assembly 400 is slidably mounted on the linear guide rail 110, and the center line of the third joint 410 and the clamping center line of the clamping assembly 300 remain coaxial. The position adjustment mechanism 420 is used to drive the power assembly 400 to move along the linear guide rail 110.

[0068] In the above embodiment, the power assembly 400 further includes a sliding seat 430 movably disposed on the linear guide rail 110, and the position adjustment mechanism 420 is connected to the sliding seat 430 to drive the sliding seat 430 to move back and forth along the linear guide rail 110. The third joint 410 is disposed on a side of the sliding seat 430 facing the clamping assembly 300, and the center line of the third joint 410 and the clamping center of the clamping assembly 300 are kept coaxial.

[0069] In some embodiments, the first joint 510 is a male joint, and its outer surface is provided with an external thread; the second joint 520 is a groove joint, and its inner surface is provided with an internal thread that matches the external thread of the first joint 510; accordingly, the third joint 410 is a male joint corresponding to the first joint 510; the power assembly 400 also includes a rotating power mechanism 440. The rotating power mechanism 440 is connected to the third joint 410 in a transmission manner to drive the third joint 410 to rotate, so that the third joint 410 and the second joint 520 are rotated to engage or release.

[0070] In the above embodiment, if Figure 6 As shown, the third joint 410 and the output shaft of the rotary power mechanism 440 are connected as one body through a connecting flange 450; an axial pin hole is provided on the connecting flange 450, and a pin shaft 460 is provided in the pin hole. The torque is transmitted through the pin shaft 460, which is conducive to uniform force and stronger impact load resistance, thereby avoiding the failure problem of the flange structure, making the service life of the third joint 410 longer and convenient for installation.

[0071] In the above embodiment, in order to avoid collision between the drill rod 500 and the connecting flange 450 , an elastic gasket 470 is provided on the side of the connecting flange 450 facing the third joint 410 .

[0072] In some embodiments, a control component (not shown in the drawings) is also included to control the operation of other components; the control component has a corresponding inductive sensor. The inductive sensor is used to detect the working state of the target component, and the control component is used to link the operation of each component. This is common in the prior art and does not present any difficulty to technicians in the relevant field, so it will not be described in detail here.

[0073] Some embodiments of the present application further disclose a drilling rig having the automatic rod changing device for the drilling rig disclosed in any of the above embodiments, so that the drilling rig has all the beneficial effects of any of the above embodiments, which will not be repeated here.

[0074] It should be clarified that in the claims, specification and drawings of the present application, the term "multiple" refers to two or more than two. Unless otherwise clearly defined, the orientation or position relationship indicated by the terms "upper" and "lower" is based on the orientation or position relationship shown in the drawings, which is only for the purpose of more conveniently describing the present application and making the description process easier, rather than indicating or implying that the device or element referred to must have the specific orientation described, be constructed and operated in a specific orientation, so these descriptions cannot be understood as limitations on the present application; the terms "connect", "install", "fix" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection between multiple objects, or a detachable connection between multiple objects, or an integral connection; it can be a direct connection between multiple objects, or an indirect connection between multiple objects through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood based on the specific circumstances of the above data.

[0075] In the claims, specification and drawings of the present application, the description of the terms "one embodiment", "some embodiments", "specific embodiments" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the claims, specification and drawings of the present application, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0076] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An automatic rod changing device for a drilling rig, wherein: A drill rod of a drilling rig is provided with a first joint at one end and a second joint at the other end; the first joints and the second joints of adjacent drill rods are mutually clamped to connect the adjacent drill rods into one body; the characteristics include: The rack, which serves as the installation base; A clamping assembly, mounted on the frame, for clamping the drill rod at a target installation position; A grabbing assembly, used for grabbing the drill rod and driving the drill rod to move between a first position and a second position; when the drill rod is located at the second position, the axis of the drill rod and the clamping center line of the clamping assembly remain coaxial; A power assembly having a third joint and a position adjustment mechanism; The third connector can be connected to the first connector or the second connector; The position adjustment mechanism is used to adjust the position of the third joint so that the third joint is close to the drill rod in the second position and drives the drill rod to move from the second position to the target installation position.

2. The automatic rod changing device for drilling rigs according to claim 1, characterized in that: The grabbing assembly includes a plurality of manipulators; the manipulators are swingably arranged between the first position and the second position relative to the frame; When the manipulator is located at the first position, the manipulator is used to load and unload the drill rod; When the manipulator is located at the second position, the manipulator is used to clamp the drill rod to connect or separate the drill rod and the third joint.

3. The automatic rod changing device for drilling rigs according to claim 2, characterized in that: The manipulator has: A base, mounted on a side of the frame; A rotating seat, pivotally connected to the base; A clamping jaw connected to the rotating seat; the center line of the clamping jaw is kept parallel to the clamping center line of the clamping assembly; the clamping jaw has a fixed part and a movable part; A first oil cylinder is connected to the rotating seat to drive the rotating seat to rotate, thereby driving the clamping claw to swing between the first position and the second position; The second oil cylinder is connected to the movable part, so as to realize the clamping or releasing of the drill rod by the clamping claw.

4. The automatic rod changing device for drilling rigs according to claim 3, characterized in that: Anti-slip structures are provided on the clamping surfaces opposite to the fixed part and the movable part.

5. The automatic rod changing device for drilling rigs according to claim 3, characterized in that: The clamping jaw is installed on the rotating seat through a clamping jaw seat; the clamping jaw seat and the rotating seat are detachably connected.

6. The automatic rod changing device for drilling rigs according to claim 1, characterized in that: It also includes an auxiliary component; the auxiliary component is used to clamp the drill rod and rotate it in the opposite direction by a certain angle when the drill rod cannot rotate during unloading, so as to loosen the adjacent drill rods to assist in unloading.

7. The automatic rod changing device for drilling rigs according to claim 6, characterized in that: The auxiliary components include: The rotary clamping mechanism comprises a clamping part and a rotating part; the clamping part is mounted on the rotating part; The rotary drive mechanism is in transmission connection with the rotary part to drive the rotary part to rotate.

8. The automatic rod changing device for drilling rig according to claim 1, characterized in that: The first joint is a convex joint; the outer surface of the first joint is provided with an external thread; The second joint is a groove joint; the inner surface of the second joint is provided with an internal thread that matches the external thread of the first joint; Wherein, the power assembly further comprises a rotating power mechanism; The third joint is in transmission connection with the rotary power mechanism and rotates under the action of the rotary power mechanism to be rotationally engaged with the first joint or the second joint.

9. The automatic rod changing device for drilling rigs according to claim 8, characterized in that: The third joint and the output shaft of the rotary power mechanism are connected and fixed via a connecting flange; an axial pin hole is provided on the side of the connecting flange; a pin shaft is provided in the pin hole; and an elastic gasket is provided on the side of the connecting flange facing the third joint.

10. A drilling rig, characterized in that: It comprises the automatic rod changing device for drilling rigs as claimed in any one of claims 1 to 9.

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