KR101659658B1 - Release assembly and method of forming drilling tool - Google Patents

Abstract

The present disclosure relates to a release assembly and method of forming a drilling tool for rock and surface layer drilling. The release assembly 18 is axially arranged between the two drilling tool components 14a, 14b. The release assembly allows the initial axial length L1 to be shortened (Ls) when the joint 15 of the drilling tool components 14 provided with the coupling screws 20, 21 is rotated in the opening direction Ro Release mechanism. Thereafter, the release assembly has a reduced second axial length (L2) and the frictional forces at the joint are reduced.

Description

[0001] RELEASE ASSEMBLY AND METHOD FOR FORMING DRILLING TOOL [0002]

The present disclosure relates to a release assembly of a drilling tool for use in rock drilling and overburden drilling. The release assembly is intended to be axially arranged between the two drilling tool components, the two drilling tool components being connected together at the joint by connecting screws.

The present disclosure also relates to the use of a release assembly and a method of forming a drilling tool for rock drilling or topsoat drilling.

The subject matter hereof is more fully defined in the preamble of the independent claims.

At mines and other workspaces, drilling machines are used to drill bore holes in rock surfaces and soil. The drilling machine includes a rotating device for rotating the drilling tool during drilling. In many drilling applications, the drilling machine also includes a striking device for generating impact pulses on the tool. The drilling tool can be composed of several drilling tool components, which are arranged continuously in the axial direction and connected to one another by connecting screws. It has proved difficult to open connecting threads between drilling components after drilling procedures. The connecting screws have a tendency to stick. Attached joints result in time and cost loss.

It is an object of the present invention to provide a new and improved arrangement for releasing connection screws between drilling components. Another object is to provide a new and improved method of forming drilling tools.

In the release assembly according to the present application, said connecting screws of the joint have a first handedness; Wherein at least one of the first opposing face and the second opposing face is provided with at least one inclined flank face having a second handle opposite to the first handle of the connecting threads, Two opposing surfaces are arranged to be elongated when they are rotated with respect to each other in the closing direction of the first knob and to be shortened when they are rotated in the opening direction of the first knob.

The method according to the invention is characterized in that the release assembly according to claim 1 is arranged between successive drilling tool components.

The idea of the disclosed approach consists in providing at least one release assembly to the drilling tool. The release assembly is arranged in a joint between two successive axial drilling tool components. The release assembly has an axial length. The release assembly includes a release mechanism that causes the axial length of the release assembly to be shortened when the joint is open.

Moreover, the connection screws and the opposing surfaces of the release assembly are opposite in their handles with respect to their opening and closing directions. The connecting screws of the joint have a first handle. Both the first opposing face and the second opposing face are provided with at least one inclined flank face having a second handle opposite the first handle of the connecting screws. Thus, the release assembly is arranged such that when the first opposed surface and the second opposed surface are rotated with respect to each other in the closing direction of the first handle, they are arranged to be longer and to be shortened when rotated in the opening direction of the first handle. That is, if the connecting screws are for right-hand use, the flank surfaces are left-handed and vice versa.

An advantage of the disclosed approach is that the release assembly allows easy opening of the connecting screws between successive drilling tool components. If the release mechanism is shortened as it is rotated in the opening direction, the frictional forces are reduced and the opening is facilitated. Moreover, sloping flank surfaces are easy to make and resistant to wear and tear.

According to one embodiment, the release assembly comprises at least one first intermediate component and at least one second intermediate component. Both components include opposing opposing surfaces and contact surfaces opposite the drilling tool component of the joint. Thanks to this embodiment, the release assembly is a separate, independent piece, which can be placed between connectable drilling components without any modifications to the basic design of the drilling tool components.

According to one embodiment, the release assembly comprises one single intermediate component. Thereafter, the intermediate component is provided with a contact surface with the one opposing face. Moreover, one of the connectable drilling components of the joint is provided with a second opposing face. Thus, the second opposing face is an integral part of the drilling tool component. The above embodiments may be advantageous when the number or axial length of the components of the release assembly need to be minimized, for example.

According to one embodiment, the angled flank surfaces of the opposite faces and the connecting screws are opposite in their grips with respect to their opening and closing directions. The connecting screws have a first pitch angle, and the tilted flank surfaces have a second pitch angle. And the second pitch angle is larger than the first pitch angle. Thanks to this embodiment, even a slight rotational movement in the direction of opening can reduce the tightening force of the flank surfaces and cause the necessary axial shortening. However, the second pitch angle should be less than 5 times for the first pitch angle. In this way, unintentional opening of the release assembly due to the influence of dynamic forces during use of the drilling tool can be prevented.

According to one embodiment, the second pitch angle of the sloping flank surfaces is 2 to 3 times the first pitch angle of the connecting screws. This embodiment is shown so that it can be used when actually tested.

According to one embodiment, the second pitch angle of the sloping flank surfaces is less than the first pitch angle of the connecting screws. Thus, this embodiment is the opposite of that described in the previous two paragraphs above. This embodiment can be used in situations where unintended opening of the release assembly is a problem.

According to one embodiment, the first opposing surface is provided with at least one first transverse surface, and the second opposing surface is provided with at least one second transverse surface. The transverse surfaces are transverse to the inclined flank surfaces. The transverse surfaces can be in the axial direction perpendicular to the flank surfaces or in the desired angular orientation. The first transverse side faces the second transverse side, and one or more flexible members are arranged therebetween. The flexible member occupies the distance between the transverse sides. The flexible member prevents the lateral faces from being placed in contact with each other. That is, the flexible member rotates the opposed elements or opposed surfaces in their opening direction relative to each other.

According to one embodiment, the aforementioned flexible member is made of one or more elastic materials, for example rubber or elastomer. When the release assembly is rotated in the opening direction, the elastic material can be temporarily compressed or reshaped.

According to one embodiment, the aforementioned flexible member is a separate element, and the separate elements are installed between mutually facing transverse sides. The separately manufactured flexible member is easy to place between the transverse faces and can be changed afterwards if necessary. In the simplest implementation, the separate flexible member can be a rubber piece.

According to one embodiment, one or both of the opposing lateral faces are covered by an elastic material used as a flexible member. There may be a space filled with an elastic material between the transverse sides. Alternatively, the faces of the transverse faces may be coated with an elastic material. The elastic material may be a material of rubber or rubber type. Some polymers, such as polyurethanes (PU), are also suitable for this purpose. In this embodiment, the flexible members are pre-arranged or integrated in the release assembly to enable easy and quick mounting of the release assembly.

According to one embodiment, the transverse surfaces are maintained at a distance from one another by one or more spring members. When the release assembly is rotated toward the opening direction, the spring member will compress the release assembly and shorten the release assembly in the axial direction. In some situations, it may be more convenient to use a spring member as a flexible member instead of the elastic material described above.

According to one embodiment, the contact surface of the intermediate component is provided with one or more friction zones with intentionally increased coefficient of friction. The friction zone may be provided with an intentionally increased surface roughness. The friction zone may include, for example, knurling. Alternatively, the friction zone may be covered with a friction material having a greater coefficient of friction than the base material of the intermediate component. The contact surface may have one or more smaller friction zones and one or more additional zones where the features are not disclosed or alternatively the entire contact surface is treated to obtain an increased coefficient of friction for the entire area. The idea of this friction zone is to prevent unintentional opening of the connecting screws by increasing the frictional forces between the intermediate component and the connectable drilling tool component.

According to one embodiment, the contact surface of the intermediate component has a tapered shape. Thanks to this tapered shape, the contact area between the intermediate piece and the connectable drilling tool component can be increased. The intermediate component may include a tapered contact surface on the outer periphery of the intermediate component or alternatively as an inner periphery.

According to one embodiment, the intermediate component has an outer peripheral portion and an inner peripheral portion, and both the outer peripheral portion and the inner peripheral portion include one or more curved surfaces. Both the outer and inner housings may have a closed configuration.

According to one embodiment, the intermediate component has a ring-like configuration and has an outer circumference and an inner circumference. The intermediate component will have, for example, a circular or elliptical shape.

According to one embodiment, the intermediate component is formed of two or more separate pieces. The intermediate component may be, for example, a sleeve piece formed of two halves.

According to one embodiment, the opposite faces of the intermediate component are formed of two or more separate pieces. The intermediate piece may be provided with a plurality of opposing pieces mounted on the recesses on the opposing face.

According to one embodiment, the release assembly is intended for use in down-the-hole drilling. The release assembly is then arranged between the drill bit assembly and the down-the-hole striking device. The drill bit assembly includes fastening members for fastening the drill bit and a drill bit. The down-the-hole striking device is also known as a DTH hammer.

According to one embodiment, the release assembly is used for DTH drilling. The release assembly is arranged between the locknut of the drill bit assembly and the DTH hammer. This lock nut is also known as a driver sub.

According to one embodiment, the release assembly is intended for use in extended drilling. The release assembly is then arranged between two successive drilling tool components. The drilling tool component may be, for example, a drill bit, a drill rod or a drill pipe.

According to one embodiment, the release assembly is intended for rotary drilling. The release assembly is then positioned between the rotating unit and the drill bit. Between the rotating unit and the drill bit there may be one or more drill tubes or rods provided with coupling screws.

According to one embodiment, the release assembly is intended for use in upper hammer drilling. The release assembly is then positioned between the drilling bit and the drilling machine located at opposite ends of the drilling rig. Between the drilling machine and the drill bit there can be one or more drill tubes or rods provided with coupling screws.

According to one embodiment, the release assembly has no connection screws. Instead, the two drilling tool components are provided with connection screws necessary to connect them at the joint. Thus, no coupling screws are provided on the faces of the release assemblies arranged relative to the connectable drilling tool components. The release assembly may be an intermediate piece arranged between two connectable drilling tool components without being fastened to the drilling tool components by the coupling screws.

The above-described embodiments may be combined to form suitable solutions provided the essential features disclosed are provided.

Some embodiments are described in further detail in the accompanying drawings.

1 is a side view of a rock drilling rig provided with a drilling unit;
Figure 2 schematically shows the principle of DTH drilling.
Figure 3 is a schematic partial side cross-sectional view of a release assembly arranged between two successive drilling tool components.
Figure 4 is a schematic side view of the release assembly when rotated in the opening direction.
Figure 5 is a schematic side view of a release assembly in which the spring is used as a flexible member.
Figure 6 is a schematic side view of a release assembly in which a flexible, formable, or resilient filler is used as a flexible member.
Figures 7a-7c schematically and axially illustrate intermediate components comprising several portions, each of which is provided with sloping flank surfaces and transverse surfaces on opposite sides.
Figures 8A and 8B schematically show the contact surfaces of the intermediate component provided with one or more friction zones.
Figure 9 is a schematic side view of a release assembly including two intermediate components and arranged at a shoulder contact at a joint between two drill rods.
10 is a schematic side view of a release assembly including only one intermediate component and arranged at a shoulder contact at a joint between two drill rods.
Figure 11 is a schematic side view of a release assembly having a bottom contact and arranged inside a coupling sleeve of a joint between two drill rods.
12 is a schematic side view of a drill bit assembly of a DTH drilling apparatus.
Figure 13 is a schematic partial side cross-sectional view of a joint between the DTH hammer and the drill bit assembly, with the release assembly having a shoulder contact.
Figure 14 is a schematic partial side cross-sectional view of another joint between the DTH hammer and the drill bit assembly, wherein the release assembly has a bottom abutment.
Figure 15 is a schematic, partial side cross-sectional view of another joint between the DTH hammer and the drill bit assembly, with the release assembly having an intermediate component provided with a tapered contact surface opposite the drill tool component.

For clarity, the Figures illustrate some embodiments of the disclosure in a simplified manner. In the drawings, the same reference numerals denote the same elements.

Figure 1 shows a rock drilling rig 1 comprising a rock drilling unit 2 which can be connected to the movable carrier 4 by a boom 3. [ The drilling unit 2 may include a transfer beam 5 and a rock drilling machine 6 supported by the transfer beam. The rock drilling machine 6 can be moved on the transfer beam 5 by the transfer device 7. The rock drilling machine (6) comprises a shank (8) at the front end of the rock drilling machine (6) for connecting the tool (9). The tool 9 may comprise one or more drill rods 10 and a drill bit 11 located at the distal end of the tool 9. The rock drilling machine 6 further comprises a shank 8 and a rotating device 12 for rotating the tool 9 connected to the shank 8. If the rock drilling is based on the rotation (R) and the feed (F) of the tool, such drilling is known as rotary drilling. However, the rock drilling machine 6 may also include a striking device or striking device 13 for generating impact pulses on the tool 9. [ This drilling is known as top hammer drilling if a striking device 13 located at the opposite end of the tool 9 as compared to the drill bit 11 is provided to the rock drilling machine 6.

The tool 9, the drill rods 10 of the tool and the drill bit 11 are drilling tool components 14 arranged axially and continuously. Between successive drilling tool components 14 there are joints 15 for interconnecting these components. These joints 15 may include connecting screws for mounting and mounting release of the joint by threading the drilling tool components 14 about each other about the centerline of the tool 9. Moreover, the front end of the tool 9 can be connected to the shank 8 by a joint 15 comprising connecting threads. The connecting screws of the joints 15 can be stuck, so that the joints 15 can be provided with the release assemblies disclosed herein.

At the drilling point, one or more drill holes 16 are drilled into the drilling unit 2. The drill holes 16 may be drilled vertically or alternatively horizontally as shown in FIG. 1 or in each direction. The drill holes 16 may be drilled into the rock material or soil.

Figure 2 shows a drilling unit for DTH drilling. The drilling unit 2 differs from the drilling unit of Figure 1 in that the striking device 41 is at the opposite end of the tool 9 with respect to the rotating device 12 or the rotating unit. During drilling, the striking device 41 is in the drill hole 16, and the drill bit 11 can be connected directly to the striking device 41. The drill bit 11 or the drill bit assembly may be connected to the striking device 13 by a lock nut 37, also known as a driver sub. As shown in Fig. 2, the tool 9 may comprise one or more drill rods 10 or tubes that can be connected in series by joints 15 provided with coupling screws. Moreover, the rear end of the tool 9 can be connected to the shank 8 by a joint 15 which also includes connecting screws. Between the lock nut 37 and the front end of the striking device 41 there is also a joint 15 with connecting screws. The connecting screws of the joints 15 can be stuck, so that the joints 15 can be provided with the release assemblies disclosed herein. The tool, the extension drill tubes, the drill bit assembly, and the impact piston are all drilling tool components 14, which are arranged axially and in turn and used during drilling. Between successive drilling tool components 14 there are joints 15 connecting these components together.

3, the release assembly 18 is shown in a simplified manner. In this embodiment, the release assembly 18 is arranged in a joint 15 between two successive axial drilling tool components 14a, 14b, which in this particular embodiment is fastened to the fastening portion 19, Is provided with a drill bit (11) and a drill tube (10). The outer surface of the fastening portion 19 is provided with external connection screws 20 and the drill tube 10 is provided with internal connection screws 21. The connecting screws 20 and 21 mesh with each other and have a first pitch angle P1. The release assembly 18 may include a first intermediate component 22a and a second intermediate component 22b that are spaced from the drilling tool components 14a and 14b. The intermediate components 22a, 22b have contact surfaces 24 opposite the drilling tool components 14. The intermediate components 22a and 22b are arranged such that the initial axial length L1 is shortened by opposing each other and by rotating the connecting screws 20 and 21 of the joint 15 in the opening direction Ro And a releasing mechanism 25 for releasing the releasing mechanism. The shortened axial length L2 after execution of the release mechanism 25 is also shown in Fig. The closing direction Rc is also shown in Fig.

In the disclosed embodiment of Fig. 3, the opposed elements of the release mechanism 25 are a first opposing face 26 and a second opposing face 27, which face each other. Both the first opposing face 26 and the second opposing face 27 are provided with at least one inclined flank face. The connecting screws 20 and 21 have a first hand and the sloped flank surfaces of the opposite faces 27 and 28 have a second handle. If the connecting screws are for right-hand use, the inclined flank surfaces are left-handed and vice versa. The inclined flanks of the opposed faces 26, 27 have a second pitch angle P2. The second pitch angle P2 is larger than the first pitch angle P1 of the connecting screws 20, 21, as is clearly shown in Fig.

The first opposing face 26 may comprise a first transverse face 28 and the second opposing face 27 may comprise a second transverse face 29 which are opposite to each other. The transverse surfaces 28, 29 define a space 30 in which the flexible member 31 is arranged. The flexible member 31 occupies the distance D1 between the transverse sides 28, 29.

When the first opposed surface 26 and the second opposed surface 27 are rotated with respect to each other in the closing direction Rc, the axial length of the release assembly 18 becomes longer. Thereafter, the release assembly 18 has an initial length L1. The axial length of the release assembly 18 is shortened when the joint 15 is opened and the first opposing face 26 is rotated relative to the second opposing face 27 in the opening direction Ro. The release assembly 18 then has a second axial length L2 so that the frictional force at the joint 15 is reduced and allows the joint 15 to open easily. The flexible member 31 enables relative movement of the intermediate components 22a, 22b towards the opening direction Ro. The flexible member 31 may be a separate piece arranged in the space 30. The flexible member may be, for example, a rubber piece.

It may also be mentioned that the intermediate components 22a, 22b may be sleeve shaped pieces having an outer diameter 32 and an inner diameter 33. [ However, other shapes and shapes are possible. Additional embodiments may include only one intermediate component 22a or 22b because one of the drill tool components 14a or 14b may have an integrated opposing face 26 or 27. [

4, the release assembly 18 is rotated toward the opening direction Ro so that the lateral faces 28, 29 are moved toward each other and the space 30 occupied by the flexible member 31 is reduced And the distance D2. The flexible member 31 can change its shape or can be compressed depending on the structure and materials used. In this embodiment, the flexible member 31 is planarized to allow relative movement of the intermediate components 22a, 22b and to shorten the length Ls of the release assembly 18. [ The initial position of the first transverse face 28 is shown in dashed lines.

In Figure 5, the flexible member 31 of the release assembly 18 is a spring arranged in the space 30. The spring may be, for example, a helical spring.

In Fig. 6, the flexible member 31 is a cast of flexible material that is injected or otherwise arranged in the space 30. Fig. The flexible material filling the space 30 may be, for example, polyurethane. The flexible material can couple the transverse sides 28, 29 together, so that the intermediate components 22a, 22b are connected to form a single uniform body. Figure 6 also differs from the approach disclosed in Figures 3-5 in that the inclined flank surfaces of the opposing surfaces 26, 27 are reversed. The handle of the inclined flank surfaces may be configured along the handle of the connecting screws. The handle is shown in the figures of the specification only by way of example. The handle of the release assembly 18 does not affect the other features shown in the figures.

7A shows that the intermediate component 22 can include multiple inclined flank surfaces and transverse surfaces 29 at the opposing face 27. [ In the approach shown in Figure 7a, the opposing face 27 is divided into four parts, but the number of these parts can be two, three or more than four.

In Figure 7b, the intermediate component 22 is formed of two halves 23a, 23b. In addition, even an intermediate component of more than two pieces can be formed. 7 (b) also shows that the transverse sides 29 can be coated with a flexible material so that the flexible member 31 is integrated into the intermediate component.

7C also shows that the intermediate component 22 may have a different form from the basic sleeve. The intermediate component 22 may have a slot 32, so that the outer periphery is not closed. On the other hand, the outer surface of the release assembly 18 need not be circular, but will have any suitable shape.

8A and 8B illustrate that the contact surface 24 of the intermediate component 22 can include more than one friction zones 33 all of which have a friction coefficient of the basic material of the intermediate component As compared with the case where the friction coefficient is larger than the friction coefficient. The friction zone 33 may comprise a knurling or other surface treatment or alternatively may comprise a coating.

Figure 9 shows a release assembly 18 arranged in a joint 15 between two drill rods or tubes of an extended drilling tool. The first drill tool component 14a may have a shoulder 34 and a release assembly 18 is arranged relative to the shoulder.

Fig. 10 shows another embodiment of the solution of Fig. The release assembly 18 includes only one intermediate component 22b which is configured such that the first opposing face 26 and the first transverse face 28 are integral with the end face of the first drilling tool component 14a Because.

11 shows a joint 15 in which the second drill tooling component 22b includes a connecting sleeve 35. In Fig. The release assembly 18 may be located at the bottom of the connecting sleeve 35.

9-11 may be for upper hammer mechanisms, where the connecting screws are typically for left-handed use, so that the inclined surfaces of the release assembly 18 are for right-hand use.

12 shows a drilling tool assembly 36 that includes a drill bit 11 and a lock nut 37. As shown in FIG. The drill bit 11 may include a fastening portion 19 and the fastening portion 38 of the lock nut 37 may be arranged around the fastening portion 19. [ The fastening portion 38 is provided with connecting screws 20. The lock nut 37 may also include a grip portion 39. At the distal end of the fastening portion 19 of the drill bit 11 is an impact surface 40 that receives impact pulses. The fastening portion 19 can slide in the axial direction with respect to the lock nut 37 during operation of the striking device 41.

In FIG. 13, it may be disposed between the down-the-hole striking device 41 and the drilling tool assembly 36. The DTH striking device 41 includes a striking piston 42 arranged to impact the striking surface 40 of the drilling tool assembly 36. The connecting screws 20 of the drilling tool assembly 36 are connected to the connecting screws provided on the inner surface of the striking device 41. The release assembly 18 allows for easy opening of the connecting screws in accordance with the principles described hereinabove.

In Fig. 14, the release assembly 18 is located at a different position compared to the arrangement of Fig. The release assembly 18 is inside the striking device 41 between the end surface 44 of the fastening portion 38 of the lock nut 37 and the retaining element 43. 14, the release assembly 18 is in bottom contact with the drilling tool components 14a, 14b of the joint 15, while in Fig. 13 a shoulder contact is applied.

13 and 14, the second intermediate component 22b of the release assembly 18 may be an integral part of the lock nut 37. [ Then, the upper surface of the grip portion 39 may include the elements necessary for acting as a part of the release mechanism.

Fig. 15 shows a joint 15 having substantially the same features as those shown in the view of Fig. 15 the second intermediate component 22b of the release assembly 18 has a tapered contact surface 24t with respect to the grip portion 39 of the lock nut 37. However, Alternatively or additionally, the contact surface 24 of the first intermediate component 22a will also have a tapered shape. Then, of course, the corresponding surfaces of the drilling tool components 14a, 14b facing the release assembly also need to be tapered as well. Furthermore, it may be considered to apply at least the tapered contact surfaces disclosed in the embodiments of Figs. 3, 9 and 10.

12-15 relate to DTH hammer measures, where the connecting screws are typically right handed, so that the inclined surfaces of the release assembly 18 are left-handed.

The drawings and the related description are intended only to illustrate the idea of the present application. In the remainder of this specification, the disclosure may be varied within the scope of the claims.

Claims (14)

A release assembly of a drilling tool for rock and overburden drilling,
The release assembly 18 is arranged axially between two drilling tool components 14 which are connectable together at the joint 15 by means of coupling screws 20,
The release assembly 18 includes a first opposing element and a second opposing element,
Wherein the first opposing element and the second opposing element are opposing opposing surfaces (26, 27)
Wherein at least one of the first opposing element and the second opposing element is arranged in an intermediate component (22) separated from the drilling tool components (14)
The intermediate component (22) has a contact surface (24) opposite one of the drilling tool components (14)
The axial length of the release assembly 18 is determined by rotating the connecting screws 20, 21 of the joint 15 in the opening direction Ro between the first opposing element and the second opposing element (L1) is shortened (L2)
The connecting screws (20, 21) of the joint (15) have a first handedness,
On both the first opposing face 26 and the second opposing face 27 there is provided at least one inclined flank face having a second handle opposite to the first handle of the connecting screws 20, The release assembly 18 is arranged such that the first opposing face 26 and the second opposing face 27 are elongated as they are rotated relative to each other in the closing direction Rc of the first knob, (Ls) when it is rotated in the opening direction (Ro) of the release assembly (20). The method according to claim 1,
The release assembly 18 includes at least one first intermediate component 22a and at least one second intermediate component 22b,
The first intermediate component 22a includes an opposing surface 26 and a contact surface 24 opposite one of the drilling tool components 14 and the second intermediate component 22b comprises an opposing surface 27, And a contact surface (24) opposite to the other of the drilling tool components (14), the opposite surfaces (26, 27) facing each other. The method according to claim 1,
The release assembly 18 includes one single intermediate component 22,
The intermediate component 22 is provided with a contact surface 24 with the opposed surface 26 or 27,
One of the connectable drilling components 14a or 14b of the joint 15 is provided with a second opposing face 26 or 27 so that a second opposing face 26 or 27 is located between the drilling component 14a or 14b, Wherein the release assembly is an integral part of the release assembly. The method according to claim 1,
The connecting screws 20 and 21 have a first pitch angle P1,
The inclined flank surfaces having a second pitch angle (P2)
Wherein the second pitch angle (P2) is greater than the first pitch angle (P1). The method according to claim 1,
Characterized in that the first opposing face (26) is provided with at least one first transverse face (28) and the second opposing face (27) is provided with at least one second transverse face (29) The first transverse surface 28 and the second transverse surface 29 are transverse to the inclined flank surfaces,
Said at least one first transverse side (28) facing said at least one second transverse side (29)
Wherein at least one flexible member (31) is present between the at least one first transverse surface (28) and the at least one second transverse surface (29), the first transverse surface (28) , And occupies a distance (D1) between the first lateral surface (29) and the second lateral surface (29). 6. The method of claim 5,
Characterized in that at least one distinct elastic element is used as said flexible member (31). 6. The method of claim 5,
Characterized in that at least one of the first transverse surface (28) and the second transverse surface (29) is covered by an elastic material used as the flexible member (31). The method according to claim 1,
At least one contact surface 24 is provided with at least one friction zone 33 with intentionally increased surface roughness or is covered by a material with a greater coefficient of friction than the base material of the intermediate component 22 Wherein the release assembly comprises: The method according to claim 1,
Characterized in that at least one contact surface (24t) is tapered. 10. The method according to any one of claims 1 to 9,
The release assembly 18 is used for down-the-hole drilling,
The release assembly 18 is arranged between the drill bit assembly 36 and the down-the-hole striking device 41,
Characterized in that the drill bit assembly (36) comprises fastening members (37, 38, 39, 43) for fastening the drill bit (11) and the drill bit (11). 11. The method of claim 10,
Characterized in that the release assembly (18) is arranged between the locknut (37) of the drill bit assembly (36) and the down-the-hole striking device (41). 10. The method according to any one of claims 1 to 9,
The release assembly 18 is used for extended drilling,
Characterized in that the release assembly (18) is arranged between two successive drilling tool components (14). 10. The method according to any one of claims 1 to 9,
The release assembly 18 is used for rotary drilling,
Characterized in that the release assembly (18) is between the rotating unit (12) and the drill bit (11). CLAIMS 1. A method of forming a drilling tool for rock and surface layer drilling,
Connecting and disconnecting at least two drilling tool components (14) to each other by means of a threaded joint (15) with connection screws (20, 21)
Rotating the drilling tool components (14) relative to each other during the connecting and separating step,
Ensuring opening of the threaded joint (15) by arranging the release assembly (18) in the threaded joint (15) between successive drilling tool components (14), and
Rotating the threaded joint 15 in the opening direction Ro and simultaneously reducing the axial length L1 of the release assembly 18 to reduce frictional forces in the threaded joint 15 ,
And arranging the release assembly according to claim 1 between said successive drilling tool components.

Images