Rotary drilling rig pressure device and rotary drilling rig

Abstract

The pressure applying device of the rotary drilling rig provided by the present application includes a mast; a drum configured to connect the first end of the hoisting wire rope and wind the hoisting wire rope; a power assembly movably connected to the mast and connected to the second end of the hoisting wire rope; a top pulley installed at the top of the mast and configured to be bypassed by the hoisting wire rope; and a first middle pulley installed in the middle of the mast and located between the drum and the top pulley, and configured to: partially support the hoisting wire rope between the drum and the top pulley on the side of the first middle pulley facing the power assembly. Thereby, the hoisting wire rope between the drum and the top pulley can be tightened and will not freely hang in the air, and the violent shaking of the wire rope between the drum and the top pulley during the operation of the system is significantly reduced.

Description

Technical Field

[0001] This application relates to the technical field of ground driving devices for rotary drilling, and particularly relates to a pressurizing device for a rotary drilling rig and a rotary drilling rig. Background Art

[0002] The rotary drilling rig is a relatively advanced pile foundation construction machine at present, and its application in the modern transportation and construction industries is becoming more and more extensive. At present, the pressurizing and pulling methods adopted by rotary drilling rigs are mainly as follows:

[0003] 1. Connect the oil cylinder between the mast and the power head, and realize the pressurization and pulling of the power head through the telescopic movement of the oil cylinder. This method can only achieve semi-stroke pressurization, and the pressurization stroke is long and the time is long;

[0004] 2. Realize the pulling and pressurization through the mast, the pressurizing hoisting device and the power assembly arranged on the mast, providing stable full-stroke pressurization for the rotary drilling rig. However, due to the long full-stroke pressurization stroke, the suspended section of the steel wire rope is too long, which is easy to vibrate and swing to other components. This not only increases the wear of the steel wire rope, and the worn steel wire rope reduces its service life, but also brings unnecessary vibration to the drilling rig, seriously affecting the stability of the mast. Summary of the Invention

[0005] In view of this, the first aspect of this application provides a pressurizing device for a rotary drilling rig, which solves the problem of the too long suspended section of the steel wire rope in the background art.

[0006] The pressurizing device for a rotary drilling rig provided by the first aspect of this application includes: a mast; a drum configured to connect the first end of the pulling steel wire rope and wind the pulling steel wire rope; a power assembly movably connected to the mast and connected to the second end of the pulling steel wire rope; a top pulley installed at the top of the mast and configured to be bypassed by the pulling steel wire rope; and a first middle pulley installed in the middle of the mast and located between the drum and the top pulley, and configured to: partially support the pulling steel wire rope between the drum and the top pulley on the side of the first middle pulley facing the power assembly.

[0007] The rotary drilling rig pressurizing device provided by the first aspect of the present application arranges a first middle pulley in the middle of the mast, and supports the hoisting wire rope between the drum and the top pulley with a part on the side facing the power assembly of the first middle pulley. This can not only make the hoisting wire rope between the drum and the top pulley taut and not hang freely, significantly reducing the violent shaking of the wire rope between the drum and the top pulley during system operation and reducing the possibility of it hitting other components, but also reduce the possibility of the wire rope hanging down to the chassis when the mast is laid down, reducing the wear of the wire rope. In addition, compressing this suspended wire rope towards the power assembly can reduce the angle between the wire rope from the drum side and the height direction of the mast in the hoisting wire rope bypassing the top pulley, reducing the lateral force of the hoisting wire rope on the top pulley, thereby improving the stability of the mast.

[0008] Combined with the first aspect, in a possible implementation, the first middle pulley is rotatably connected to the mast along the first axis of the first middle pulley, and the first middle pulley is connected to the mast so as to move relative to the mast in a first direction. The connection structure for moving relative to the mast in the first direction is such that the part of the first middle pulley in contact with the hoisting wire rope can move perpendicular to the plane where the first middle pulley itself is located.

[0009] Combined with the first aspect, in a possible implementation, the first middle pulley is arranged to slide relative to the mast along the first axis of the first middle pulley.

[0010] Combined with the first aspect, in a possible implementation, the first middle pulley is rotatably arranged with the mast along a second axis, and the direction of the second axis is consistent with the length direction of the mast.

[0011] Combined with the first aspect, in a possible implementation, it further includes: a middle pulley limiting member, which is fixedly arranged relative to the mast and is configured to limit the movement of the first middle pulley in the first direction.

[0012] Combined with the first aspect, in a possible implementation, it further includes: a wire rope blocking rod, which is configured to block the movement of a part of the hoisting wire rope away from the mast.

[0013] Combined with the first aspect, in a possible implementation, it further includes: a bottom pulley, which is installed at the bottom of the mast. The bottom pulley is configured to be bypassed by a pressure wire rope. The third end of the pressure wire rope is connected to the drum, and a part of the pressure wire rope is wound around the drum. The fourth end of the pressure wire rope is connected to the power assembly.

[0014] In combination with the first aspect, in a possible implementation manner, it further includes: a second middle pulley, installed in the middle of the mast, and the second middle pulley is configured such that the positions where the pressure wire rope starts to contact and disengages from the second middle pulley are opposite positions in the radial direction of the second middle pulley.

[0015] In combination with the first aspect, in a possible implementation manner, a pulling wire rope fixing part is provided at the upper part of the mast and is configured to be fixedly connected to the second end of the pulling wire rope; a pressure wire rope fixing part is provided at the lower part of the mast and is configured to be fixedly connected to the fourth end of the pressure wire rope; the power assembly further includes: a first movable pulley, located in the power assembly and configured to be bypassed by the pulling wire rope between the top pulley and the pulling wire rope fixing part; a second movable pulley, located in the power assembly and configured to be bypassed by the pressure wire rope between the bottom pulley and the pressure wire rope fixing part.

[0016] The purpose of the second aspect of the present application is to provide a rotary drilling rig, which solves the technical problem of too long a suspended section of the wire rope in the background art.

[0017] A rotary drilling rig provided by the second aspect of the present application includes: a chassis; a slewing mechanism installed on the chassis; a slewing platform connected to the slewing mechanism; and the rotary drilling rig pressurizing device according to any one of the above, installed on the slewing platform.

[0018] Since the rotary drilling rig provided by the second aspect of the present application includes the rotary drilling rig pressurizing device in any one of the above implementation manners, it has the technical effects of any one of the above rotary drilling rig pressurizing devices, which will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The figure shows a schematic diagram of a rotary drilling rig pressurizing device provided by an implementation manner of the present application.

[0020] Figure 2 The figure shows a partial top view of the first middle pulley and the middle pulley support in the rotary drilling rig pressurizing device provided by another implementation manner of the present application.

[0021] Figure 3 The figure shows a partial top view of the first middle pulley and the middle pulley support in the rotary drilling rig pressurizing device provided by another implementation manner of the present application.

[0022] Figure 4 The figure shows a schematic diagram of a rotary drilling rig pressurizing device provided by another implementation manner of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0024] Figure 1 The figure shows a schematic diagram of a pressurizing device for a rotary drilling rig provided by an implementation manner of the present application. The pressurizing device for the rotary drilling rig includes: a mast 70; a drum 40 configured to connect the first end of a hoisting wire rope 81 and wind the hoisting wire rope 81; a power assembly 60 movably connected to the mast 70 and connected to the second end of the hoisting wire rope 81; a top pulley 10 installed at the top of the mast 70 and configured to be bypassed by the hoisting wire rope 81; and a first middle pulley 30 installed in the middle of the mast 70 and located between the drum 40 and the top pulley 10, and configured to: partially support the hoisting wire rope 81 between the drum 40 and the top pulley 10 on the side of the first middle pulley 30 facing the power assembly 60.

[0025] By arranging the first middle pulley 30 in the middle of the mast 70 and partially supporting the hoisting wire rope 81 between the drum 40 and the top pulley 10 on the side of the first middle pulley 30 facing the power assembly 60, the pressurizing device for the rotary drilling rig can not only make the hoisting wire rope 81 between the drum 40 and the top pulley 10 taut and not hang freely, significantly reduce the severe shaking of the wire rope between the drum 40 and the top pulley 10 during system operation, and reduce the possibility of it hitting other components, but also reduce the possibility of the wire rope hanging down to the chassis when the mast 70 is laid down and reduce the wear of the wire rope.

[0026] In addition, by compressing this suspended wire rope towards the power assembly 60, the angle between the wire rope on the side of the drum 40 in the hoisting wire rope 81 bypassing the top pulley 10 and the height direction of the mast 70 can be reduced, that is, the wire rope entry angle of the top pulley 10 is reduced. Since the tension on the hoisting wire rope 81 remains unchanged, when the wire rope entry angle is reduced, the sine value of the wire rope entry angle is also reduced, and naturally the horizontal component of the tension of the hoisting wire rope 81 is also reduced. That is, the lateral force of the hoisting wire rope 81 on the top pulley 10 is reduced, thereby improving the stability of the mast 70.

[0027] Figure 2 The figure shows a partial top view of the first middle pulley 30 and the middle pulley support 31 in the pressurizing device for a rotary drilling rig provided by another implementation manner of the present application. Figure 3The figure shows a partial top view of the first middle pulley 30 and the middle pulley support 31 in the pressurizing device of the rotary drilling rig provided by another implementation manner of the present application. As Figure 2 and Figure 3 shown, in a possible implementation manner, the first middle pulley 30 is rotationally connected to the mast 70 along the first axis of the first middle pulley 30, and the first middle pulley 30 is connected to move relative to the mast 70 in a first direction. The connection structure for moving relative to the first direction is such that the portion of the first middle pulley 30 in contact with the pulling wire rope 81 can move perpendicular to the plane where the first middle pulley 30 itself is located.

[0028] Specifically, in addition to having the general property of a pulley - rotating around the first axis of its own rotating body, the first middle pulley 30 also has other movements relative to the mast 70. This movement is reflected in that the portion of the first middle pulley 30 for supporting the pulling wire rope 81 not only has the property of rotating around the axis of the rotating body of the pulley, but also moves in a direction perpendicular to the plane where this part of the first middle pulley 30 is located. That is, this part for supporting the pulling wire rope 81 will move in a direction perpendicular to Figure 2 the plane of the paper where it is located.

[0029] Since as the drum 40 continuously winds or releases the pulling wire rope 81, the position where the pulling wire rope 81 contacts or detaches from the drum 40 continuously changes in the axial direction of the drum 40. By setting the first middle pulley 30 as described above, it can realize the displacement of the part of the first middle pulley 30 supporting the pulling wire rope 81 in the axial direction of the drum 40, so as to adapt to the change of the outlet position or the inlet position of the pulling wire rope 81 on the drum 40, reduce the lateral force between the wire rope and the pulley groove of the first middle pulley 30, that is, the force in the axial direction of the drum 40, reduce the friction between the two, reduce the wear between the two, improve the service life of the wire rope, and at the same time, can also improve the service life of the first middle pulley 30.

[0030] As Figure 2 shown, in a possible implementation manner, the first middle pulley 30 is arranged to slide relative to the mast 70 along the first axis of the first middle pulley 30. Specifically, the first middle pulley 30 is axially fixed and circumferentially rotatably installed on the middle pulley support 31, and the middle pulley support 31 is slidably installed on the guide rail 32. The extending direction of the guide rail 32 is the axial direction of the drum 40, and both ends of the guide rail 32 are fixed on the pulley support plate 34 arranged in the middle of the mast 70 through the guide rail supports 33. Specifically, the pulley support plate 34 can be L - shaped, and the space between the L - shape and the mast 70 is used to accommodate the axial position movement of the pulling wire rope 81.

[0031] The first middle pulley 30 is slidably arranged. When the inlet position or the outlet position of the pulling wire rope 81 on the drum 40 undergoes an axial change, the pulling wire rope 81 exerts a force on the first middle pulley 30 along the axis direction of the first middle pulley 30, and the first middle pulley 30 can drive the middle pulley support 31 to slide along the guide rail 32. That is, when the outlet position of the pulling wire rope 81 moves upward to Figure 2 above, the right half of the first middle pulley 30, that is, the part supporting the pulling wire rope 81, also moves upward, and the first middle pulley 30 and the pulley support as a whole move upward to Figure 2 above. Thus, it can adapt to the axial displacement of the outlet position or the inlet position, reduce the force on the pulling wire rope 81, reduce the service load of the pulling wire rope 81, and extend the service life of the pulling wire rope 81.

[0032] As Figure 3 shown, in a possible implementation, the first middle pulley 30 is rotatably arranged with the mast 70 along a second axis, and the direction of the second axis is consistent with the length direction of the mast 70. Among them, the direction of the second axis is consistent with the length direction of the mast 70, not only limited to the absolute parallelism of their directions. A slight deviation, such as an included angle of 5° or 10°, can also be considered consistent.

[0033] Specifically, in this implementation, the first middle pulley 30 is axially fixed and circumferentially rotatably installed on the middle pulley support 31, and the middle pulley support 31 is rotatably installed on a pulley support shaft (not shown in the figure). The pulley support shaft is fixedly installed on the pulley support plate 34 arranged in the middle of the mast 70. Specifically, the pulley support plate 34 can be L-shaped, and the space between the L-shape and the mast 70 is used to accommodate the axial position movement of the pulling wire rope 81.

[0034] The first middle pulley 30 is arranged to be rotatable along the second axis. When the inlet position or the outlet position of the pulling wire rope 81 on the drum 40 undergoes an axial change, the pulling wire rope 81 exerts a force on the first middle pulley 30 along the axis direction of the first middle pulley 30, and the first middle pulley 30 can drive the middle pulley support 31 to swing along the guide rail 32. That is, when the outlet position of the pulling wire rope 81 moves upward to Figure 3 above, the right half of the first middle pulley 30, that is, the part supporting the pulling wire rope 81, also moves upward, and the first middle pulley 30 and the pulley support swing counterclockwise to Figure 3 above. The positions of the first middle pulley 30 and the middle pulley support 31 after swinging are shown by the double-dot dash line in Figure 3 . Thus, it can adapt to the axial displacement of the outlet position or the inlet position, reduce the force on the pulling wire rope 81, reduce the service load of the pulling wire rope 81, and extend the service life of the pulling wire rope 81.

[0035] In a possible implementation, it further includes: a middle pulley limiting member, which is fixedly arranged relative to the mast 70 and configured to limit the movement of the first middle pulley 30 in the first direction.

[0036] Specifically, as Figure 2 shown, when the first middle pulley 30 and the mast 70 are slidably arranged along the first axis, the guide rail supports 33 at both ends of the guide rail 32 can function as the middle pulley limiting member to prevent the middle pulley support 31 from moving too large a distance, and thus limit the sliding of the first middle pulley 30 along the first axis direction, that is, limit the movement of the first middle pulley 30 in the first direction.

[0037] As Figure 3 shown, when the first middle pulley 30 and the mast 70 are rotatably arranged along the second axis, a limiting rod 35 can be arranged on the pulley support plate 34 rope as the limiting member of the first middle pulley 30 to limit the maximum swing angle of the first middle pulley 30, so as to limit the movement of the first middle pulley 30 in the first direction.

[0038] Setting the middle pulley limiting member can prevent the part of the first middle pulley 30 that supports the pulling-out wire rope 81 from moving too large a distance, slow down the axial change of the pulling-out wire rope 81 due to the change in the wire rope's outlet position and inlet position, reduce the change in the included angle between the pulling-out wire rope 81 and the top pulley 10, reduce the component force of the force exerted by the pulling-out wire rope 81 on the top pulley 10 in the direction perpendicular to the paper surface, reduce the moment that causes the mast 70 to topple formed by this component force at the top of the mast 70, limit the sway of the mast 70, and improve the safety of construction.

[0039] In a possible implementation, it further includes: a wire rope blocking rod 73, which is configured to block the movement of a part of the pulling-out wire rope 81 away from the mast 70.

[0040] By setting the wire rope blocking rod 73, when the mast 70 is laid down, it can support the pulling-out wire rope 81, prevent the pulling-out wire rope 81 from drooping onto the chassis of the rotary drilling rig and causing wear of the wire rope and the chassis, and extend the service life of the pulling-out wire rope 81.

[0041] In a possible implementation, it further includes: a bottom pulley 50, which is installed at the bottom of the mast 70. The bottom pulley 50 is configured to be bypassed by a pressure wire rope 82. The third end of the pressure wire rope 82 is connected to the drum 40, and a part of the pressure wire rope 82 is wound around the drum 40. The fourth end of the pressure wire rope 82 is connected to the power assembly 60.

[0042] A bottom pulley 50 is provided, and the third end of the pressure steel wire rope 82 is also connected to the drum 40. When the pulling steel wire rope 81 is wound up, the pressure steel wire rope 82 can be released simultaneously to provide sufficient stroke space for the pressure steel wire rope 82 when the traction power assembly 60 moves. Also, when the pulling steel wire rope 81 is released, the pressure steel wire rope 82 can be wound up to drive the power assembly 60 to move. Connecting both the pulling steel wire rope 81 and the pressure steel wire rope 82 to the drum 40 can achieve two functions when the drum 40 completes one action, improving the action efficiency.

[0043] In a possible implementation, it further includes: a second middle pulley 20 installed in the middle of the mast 70. The second middle pulley 20 is configured such that the positions where the pressure steel wire rope 82 starts to contact and disengages from the second middle pulley 20 are opposite positions in the radial direction of the second middle pulley 20. Here, the opposite positions in the radial direction do not only mean that the two positions are absolutely 180° apart on the second middle pulley 20. Even if they are 175°, 170°, or even 160° apart, they can be considered as opposite positions in the radial direction.

[0044] The second middle pulley 20 is provided so that the pressure steel wire rope 82 bypasses the second middle pulley 20, and the positions where the pressure steel wire rope 82 starts to contact and disengages from the second middle pulley 20 are both opposite positions in the radial direction of the second middle pulley 20. This can reduce the angle between the pressure steel wire rope 82 and the longitudinal direction of the mast 70 between the second middle pulley 20 and the bottom pulley 50, that is, the rope entry angle of the bottom pulley 50 also becomes smaller. Since the tension on the pressure steel wire rope 82 remains unchanged, when the rope entry angle decreases, the sine value of the rope entry angle also decreases, and the horizontal component of the tension of the pressure steel wire rope 82 also decreases. That is, the lateral force exerted on the bottom pulley 50 by the pressure steel wire rope 82 is reduced, and the stability of the mast 70 can also be improved.

[0045] In a possible implementation, a pulling steel wire rope fixing part 71 is provided at the upper part of the mast 70 and is configured to be fixedly connected to the second end of the pulling steel wire rope 81; a pressure steel wire rope fixing part 72 is provided at the lower part of the mast 70 and is configured to be fixedly connected to the fourth end of the pressure steel wire rope 82; the power assembly 60 further includes: a first movable pulley 61 located in the power assembly 60 and configured to be bypassed by the pulling steel wire rope 81 between the top pulley 10 and the pulling steel wire rope fixing part 71; a second movable pulley 62 located in the power assembly 60 and configured to be bypassed by the pressure steel wire rope 82 between the bottom pulley 50 and the pressure steel wire rope fixing part 72.

[0046] By setting the extraction wire rope fixing part 71 and the pressure wire rope fixing part 72, and simultaneously arranging a first movable pulley 61 and a second movable pulley 62 on the power assembly 60, a movable pulley group can be formed. Without changing the traction force of the drum 40, the acting force applied to the power assembly 60 can be increased, improving the rotary drilling effect.

[0047] The operating principle of this embodiment is as follows:

[0048] Taking the case where the first movable pulley 61 and the second movable pulley 62 are not arranged on the power assembly 60 as an example, there are two wire ropes wound around the drum 40. One is the extraction wire rope 81, and the other is the pressure wire rope 82. The winding directions of the extraction wire rope 81 and the pressure wire rope 82 around the drum 40 are the same, and their out - rope ends from the drum 40 are respectively located at both axial ends of the drum 40. The first end of the extraction wire rope 81 is connected to the drum 40, and the extraction wire rope 40 sequentially passes through the first middle pulley 30 and the top pulley 10. The second end of the extraction wire rope 81 is connected to the power assembly 60. The third end of the pressure wire rope 82 is connected to the drum 40, and the pressure wire rope 82 sequentially passes through the second middle pulley 20 and the bottom pulley 50. The fourth end of the pressure wire rope 82 is connected to the power assembly 60.

[0049] When it is necessary to raise the power assembly 60, the drum 40 rotates, starting to wind up the extraction wire rope 81. The extraction wire rope 81 wound around the drum 40 increases, and the in - rope position of the extraction wire rope 81 undergoes an axial movement. For example, it moves in the direction away from the observer along the Figure 1 plane of the paper where it is located. The lower part of the extraction wire rope 81 will also Figure 1 move in the direction away from the observer along the plane of the paper where it is located. At this time, the extraction wire rope 81 will push the Figure 2 right - hand half shown in the figure of the first middle pulley 30 to move upward. Correspondingly, Figure 2 in the implementation shown, the first middle pulley 30 will move upward to Figure 3 above, or, Figure 3 in the implementation shown, the first middle pulley 30 will swing counterclockwise along Figure 2 it. At this time, Figure 1 in, the extraction wire rope 81 on the right side of the top pulley 10 decreases, and the power assembly 60 is pulled up by the extraction wire rope 81.

[0050] Due to the rotation of the drum 40, on the other hand, the pressure wire rope 82 wound around the drum 40 will also be released. The pressure wire rope 82 passes through the second middle pulley 20 and the bottom pulley 50 and runs to Figure 1On the right side of the middle-bottom pulley 50. During the lifting process of the power assembly 60, the pressure steel wire rope 82 below the power assembly 60 increases, facilitating the application of a pulling force to lower the power assembly 60 during the downward movement of the power assembly 60 by the pressure steel wire rope 82.

[0051] Another implementation of the present application also provides a rotary drilling rig, including: a chassis; a slewing mechanism installed on the chassis; a slewing platform connected to the slewing mechanism; and the rotary drilling rig pressurizing device according to any one of the above, installed on the slewing platform. When the rotary drilling rig is in use, the mast can be erected. When the rotary drilling rig is not performing rotary drilling and is in a storage or transportation state, the mast can be laid down. Due to the support of the first middle pulley and the blocking of the rope blocking rod, the pulling steel wire rope will not wear against the chassis and the slewing platform, improving the service life of the pulling steel wire rope.

[0052] Since the rotary drilling rig includes the rotary drilling rig pressurizing device in any one of the above implementations, it has the technical effects of any one of the above rotary drilling rig pressurizing devices, which will not be elaborated here.

[0053] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A pressurizing device for a rotary drilling rig, characterized in that, Comprising: A mast; A drum configured to connect to the first end of the extraction wire rope and wind the extraction wire rope; A power assembly movably connected to the mast and connected to the second end of the extraction wire rope; A top pulley installed at the top of the mast and configured to be bypassed by the extraction wire rope; And A first middle pulley installed in the middle of the mast and located between the drum and the top pulley, configured such that a part of the first middle pulley facing the power assembly side locally supports the extraction wire rope between the drum and the top pulley; The first middle pulley is rotatably connected to the mast along a first axis of the first middle pulley, and the first middle pulley is connected to the mast to move relatively in a first direction. The connection configured to move relatively in the first direction is such that a part of the first middle pulley in contact with the extraction wire rope can move perpendicular to a plane in which the first middle pulley itself is located; The first middle pulley is arranged to slide relative to the mast along the first axis of the first middle pulley, or the first middle pulley and the mast are rotatably arranged along a second axis, and a direction of the second axis is consistent with a length direction of the mast.

2. The pressurizing device of the rotary drilling rig according to claim 1, wherein Further comprising: A middle pulley position limiting member fixedly arranged relative to the mast and configured to limit the movement of the first middle pulley along the first direction.

3. The pressurizing device of the rotary drilling rig according to claim 1, characterized in that Further comprising: A wire rope blocking rod configured to block the movement of a part of the extraction wire rope away from the mast.

4. The pressurizing device of the rotary drilling rig according to claim 1, characterized in that, Further comprising: A bottom pulley installed at the bottom of the mast. The bottom pulley is configured to be bypassed by a pressure wire rope. A third end of the pressure wire rope is connected to the drum, and a part of the pressure wire rope is wound on the drum. A fourth end of the pressure wire rope is connected to the power assembly.

5. The pressurizing device of the rotary drilling rig according to claim 4, characterized in that, Further comprising: A second middle pulley installed in the middle of the mast. The second middle pulley is configured such that positions where the pressure wire rope starts to contact and disengages from the second middle pulley are opposite positions in the radial direction of the second middle pulley.

6. The pressurizing device of a rotary drilling rig according to claim 4 or 5, wherein An extraction wire rope fixing part is arranged at the upper part of the mast and configured to be fixedly connected to the second end of the extraction wire rope; A pressure wire rope fixing part is arranged at the lower part of the mast and configured to be fixedly connected to the fourth end of the pressure wire rope; The power assembly further comprises: A first movable pulley located in the power assembly and configured to be bypassed by the extraction wire rope between the top pulley and the extraction wire rope fixing part; A second movable pulley located in the power assembly and configured to be bypassed by the pressure wire rope between the bottom pulley and the pressure wire rope fixing part.

7. A rotary drilling rig, characterized in that, Comprising: A chassis; A slewing mechanism installed on the chassis; A slewing platform connected to the slewing mechanism; And The pressurizing device of a rotary drilling rig according to any one of claims 1 - 6 is installed on the slewing platform.

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