CN214273555U - Rotary drilling rig and pressurizing device thereof - Google Patents

Abstract

The rotary drilling rig pressurizing device comprises a mast; a drum configured to connect a first end of the pull-up wire rope and to wind the pull-up wire rope; the power assembly is movably connected with the mast and is connected with the second end of the pulling steel wire rope; a top pulley installed at the top of the mast and configured to be wound by the pull-up wire rope; and a first middle pulley installed at the middle of the mast and located between the drum and the top pulley, configured to: the part of the first middle pulley facing to one side of the power assembly supports the pulling steel wire rope between the winding drum and the top pulley. Therefore, the section between the winding drum and the top pulley is pulled up to be tightened and is not suspended freely, and the violent shaking of the steel wire rope between the winding drum and the top pulley is obviously reduced when the system runs.

Description

Rotary drilling rig and pressurizing device thereof

Technical Field

The application relates to the technical field of ground driving devices for rotary drilling, in particular to a rotary drilling rig pressurizing device and a rotary drilling rig.

Background

The rotary drilling unit is an advanced pile foundation construction machine at present, and is more and more widely applied to modern traffic and building industries. The current rotary drilling rig adopts a pressurizing and pulling mode which mainly comprises the following steps:

1. the oil cylinder is connected to the mast and the power head, and the pressurization and the pulling-up of the power head are realized through the extension and contraction of the oil cylinder. The method can only realize half-stroke pressurization, and the pressurization stroke is long and the time is long;

2. the lifting and pressurizing are realized through the mast, the pressurizing winch device and the power assembly arranged on the mast, stable full-stroke pressurizing is provided for the rotary drilling rig, but the full-stroke pressurizing stroke is long, the suspended section of the steel wire rope is too long and is easy to shake, other parts are thrown, the abrasion of the steel wire rope is increased, the service life of the steel wire rope is shortened, unnecessary vibration is brought to the drilling rig, and the stability of the mast is seriously influenced.

Disclosure of Invention

In view of this, the first aspect of the present application provides a rotary drilling rig pressurizing device, which solves the problem of an overlong steel wire rope suspension section in the background art.

The utility model provides a rotary drilling rig pressure device who provides of first aspect includes: a mast; a drum configured to connect a first end of a pull-up wire rope and to wind the pull-up wire rope; the power assembly is movably connected with the mast and is connected with the second end of the pulling steel wire rope; a top pulley mounted on the top of the mast, configured to be bypassed by the pull-up wire; and a first middle pulley mounted at the middle of the mast, between the drum and the top pulley, configured to: the part of one side, facing the power assembly, of the first middle pulley supports the pull-up steel wire rope between the winding drum and the top pulley.

The utility model provides a rotary drilling rig pressure device, through set up first middle part pulley in the middle part of mast, with the local support reel that faces power component one side of first middle part pulley and the wire rope that pulls out between the top pulley, not only can make this section between reel and the top pulley pull out the wire rope and tighten, can not hang freely, the violent shake of wire rope between reel and the top pulley obviously alleviates when the system operation, the possibility that it got rid of on other parts has been reduced, and, can also when the mast is fallen down, reduce wire rope and hang to the possibility on the chassis, reduce wire rope's wearing and tearing. In addition, the suspended steel wire rope is compressed towards the direction of the power assembly, so that the included angle between the steel wire rope from one side of the winding drum and the height direction of the mast in the pulling steel wire rope bypassing the top pulley can be reduced, the transverse acting force of the pulling steel wire rope on the top pulley is reduced, and the stability of the mast is improved.

With reference to the first aspect, in one possible implementation manner, 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, where the connection to move relatively in the first direction is configured to: and the part of the first middle pulley, which is in contact with the pull-up steel wire rope, can move perpendicular to the plane of the first middle pulley.

With reference to the first aspect, in one possible implementation manner, the first middle pulley is disposed along a first axis of the first middle pulley in a manner of sliding relative to the mast.

With reference to the first aspect, in a possible implementation manner, the first middle pulley and the mast are rotatably disposed along a second axis, and a direction of the second axis is identical to a length direction of the mast.

With reference to the first aspect, in a possible implementation manner, the method further includes: a middle pulley stop fixedly disposed opposite the mast configured to limit movement of the first middle pulley in the first direction.

With reference to the first aspect, in a possible implementation manner, the method further includes: a rope blocking lever configured to block movement of a part of the pull-up wire rope away from the mast.

With reference to the first aspect, in a possible implementation manner, the method further includes: the bottom pulley is installed at the bottom of the mast and is configured to be wound by a pressure steel wire rope, the third end of the pressure steel wire rope is connected to the winding drum, part of the pressure steel wire rope is wound on the winding drum, and the fourth end of the pressure steel wire rope is connected with the power assembly.

With reference to the first aspect, in a possible implementation manner, the method further includes: a second middle pulley mounted at a middle of the mast, the second middle pulley configured to: the positions where the pressure wire rope comes into and out of contact with the second middle sheave are diametrically opposite positions of the second middle sheave.

With reference to the first aspect, in one possible implementation manner, a pull-up wire rope fixing portion is disposed at an upper portion of the mast and configured to be fixedly connected with a second end of the pull-up wire rope; the pressure steel wire rope fixing part is arranged at the lower part of the mast and is constructed to be fixedly connected with the fourth end of the pressure steel wire rope; the power assembly further includes: a first movable sheave in the power assembly configured to be passed around by the pull-up wire rope between the top sheave and the pull-up wire rope fixing portion; a second movable sheave in the power assembly configured to be bypassed by the pressure wire rope between the bottom sheave and the pressure wire rope fixing portion.

An object of the second aspect of the present application is to provide a rotary drilling rig, which solves the technical problem of overlong suspended section of a steel wire rope in the background art.

The second aspect of the present application provides a rotary drilling rig, including: a chassis; the slewing mechanism is arranged on the chassis; the rotary platform is connected with the rotary mechanism; and the rotary drilling rig pressurizing device is arranged on the rotary platform.

The rotary drilling rig provided by the second aspect of the application comprises the rotary drilling rig pressurizing device in any one of the implementation modes, so that the technical effect of any one of the rotary drilling rig pressurizing devices is achieved, and the details are not repeated.

Drawings

Fig. 1 is a schematic view of a rotary drilling rig pressurizing device according to an implementation manner of the present application.

Fig. 2 is a top view of a part of a first middle pulley and a middle pulley support in a pressing device of a rotary drilling rig according to another implementation manner of the present application.

Fig. 3 is a top view of a part of a first middle pulley and a middle pulley support in a pressing device of a rotary drilling rig according to another implementation manner of the present application.

Fig. 4 is a schematic view of a rotary drilling rig pressurizing device according to another implementation manner of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Fig. 1 is a schematic view of a rotary drilling rig pressurizing device according to an implementation manner of the present application. This rotary drilling rig pressure device includes: a mast 70; a drum 40 configured to be connected to a first end of the pull-up wire rope 81 and to wind the pull-up wire rope 81; the power assembly 60 is movably connected with the mast 70 and is connected with the second end of the pulling steel wire rope 81; a top pulley 10 installed on the top of the mast 70 and configured to be wound by a pull-up wire rope 81; and a first middle block 30 installed at the middle of the mast 70 and between the drum 40 and the top block 10, configured to: the part of the first middle sheave 30 on the side facing the power assembly 60 supports the pull-up wire 81 between the drum 40 and the top sheave 10.

According to the pressurizing device of the rotary drilling rig, the first middle pulley 30 is arranged in the middle of the mast 70, the part of the first middle pulley 30 facing one side of the power assembly 60 supports the pulling steel wire rope 81 between the winding drum 40 and the top pulley 10, so that the pulling steel wire rope 81 between the winding drum 40 and the top pulley 10 is tightened and cannot be freely suspended, violent shaking of the steel wire rope between the winding drum 40 and the top pulley 10 during system operation is obviously reduced, the possibility that the steel wire rope is thrown onto other parts is reduced, the possibility that the steel wire rope hangs down to a bottom disc is reduced when the mast 70 is laid down, and abrasion of the steel wire rope is reduced.

In addition, the suspended steel wire rope is compressed towards the direction of the power assembly 60, so that the included angle between the steel wire rope from one side of the winding drum 40 and the height direction of the mast 70 in the pull-up steel wire rope 81 which bypasses the top pulley 10 can be reduced, namely the rope inlet angle of the top pulley 10 is reduced. Since the pulling force on the uplift steel wire rope 81 is unchanged, the rope entry angle is reduced, the sine value of the rope entry angle is also reduced, and the component of the pulling force of the uplift steel wire rope 81 in the horizontal direction is also reduced naturally. That is, the lateral force of the pull-up wire 81 received by the top sheave 10 is reduced, thereby improving the stability of the mast 70.

Fig. 2 is a partial top view of a first middle pulley 30 and a middle pulley support 31 in a rotary drilling rig pressing device according to another implementation manner of the present application. Fig. 3 is a partial top view of a first middle pulley 30 and a middle pulley support 31 in a rotary drilling rig pressing device according to another implementation manner of the present application. As shown in fig. 2 and 3, in one possible implementation, the first middle pulley 30 is rotatably connected to the mast 70 along a first axis of the first middle pulley 30, and the connection for relative movement of the first middle pulley 30 in a first direction with respect to the mast 70 is configured to: so that the part of the first middle pulley 30 in contact with the pull-up wire rope 81 can move perpendicular to the plane of the first middle pulley 30 itself.

Specifically, the first intermediate sheave 30 has other motions relative to the mast 70 in addition to the general nature of a sheave that rotates about the first axis of its body of rotation. This movement is realized in such a manner that the portion of the first intermediate sheave 30 for supporting the wire rope 81 is not only in the nature of rotating about the axis of the sheave, which is a solid of revolution, but also in the direction perpendicular to the plane of the portion of the first intermediate sheave 30. That is, the portion supporting the pull-up wire rope 81 moves in a direction perpendicular to the paper surface on which fig. 2 is laid.

Since the position where the pullout wire rope 81 contacts or disengages from the drum 40 as the drum 40 continuously winds or releases the pullout wire rope 81, the position is constantly changed in the axial direction of the drum 40. Set up first middle part pulley 30 like this, can realize that first middle part pulley 30 supports the displacement of the part of pulling up wire rope 81 in the axial of reel 40, thereby adapt to the change of pulling up wire rope 81 at the play line position or the inlet wire position of reel 40, in order to reduce the side direction effort between the race of wire rope and first middle part pulley 30, along the effort of reel 40 axial direction promptly, the frictional force between the two has been reduced, reduce wearing and tearing between the two, improve wire rope's life, simultaneously, also can improve the life of first middle part pulley 30.

As shown in fig. 2, in one possible implementation, the first intermediate sheave 30 is slidably disposed relative to the mast 70 along a first axis of the first intermediate sheave 30. Specifically, the first middle pulley 30 is axially fixed and circumferentially rotatably mounted on the middle pulley support 31, the middle pulley support 31 is slidably mounted on the guide rail 32, the extending direction of the guide rail 32 is the axial direction of the winding drum 40, and two 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 support 33. Specifically, the sheave support plate 34 may be L-shaped, and the space between the L-shape and the mast 70 is used to accommodate the axial position movement of the pull-up wire 81.

With the sliding arrangement of the first middle pulley 30, when the line-feeding position or the appearance position of the pull-up steel wire rope 81 on the winding drum 40 changes axially, the pull-up steel wire rope 81 applies an acting force along the axial direction of the first middle pulley 30 to 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 position of the wire drawn out of the pull-up wire rope 81 moves upward in fig. 2, the right half of the first intermediate pulley 30, that is, the portion supporting the pull-up wire rope 81 also moves upward, and the first intermediate pulley 30 and the pulley support base are moved upward in fig. 2 as a whole. Therefore, the axial displacement of the wire outgoing position or the wire incoming position is adapted, so that the acting force on the pulling-up steel wire rope 81 is reduced, the service load of the pulling-up steel wire rope 81 is reduced, and the service life of the pulling-up steel wire rope 81 is prolonged.

In one possible implementation, as shown in fig. 3, the first middle sheave 30 is rotatably disposed with the mast 70 along a second axis, which is aligned with the length of the mast 70. The direction of the second axis is consistent with the length direction of the mast 70, and is not limited to be absolutely parallel to the direction of the mast, and a slight deviation, such as an included angle of 5 ° or 10 °, may also be considered consistent.

Specifically, in this implementation, first intermediate sheave 30 is axially fixed and circumferentially rotatably mounted on an intermediate sheave support 31, and intermediate sheave support 31 is rotatably mounted on a sheave support shaft (not shown). The pulley holder shaft is fixedly mounted on the pulley support plate 34 provided at the middle of the mast 70. Specifically, the sheave support plate 34 may be L-shaped, and the space between the L-shape and the mast 70 is used to accommodate the axial position movement of the pull-up wire 81.

The first middle pulley 30 is arranged to rotate along the second axis, when the line feeding position or the appearance position of the pull-up steel wire rope 81 on the winding drum 40 changes axially, the pull-up steel wire rope 81 applies an acting force along the axis direction of the first middle pulley 30 to 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 wire-outgoing position of the pull-up wire rope 81 moves upward in fig. 3, the right half of the first intermediate pulley 30, that is, the portion supporting the pull-up wire rope 81 also moves upward, the first intermediate pulley 30 and the pulley support base swing counterclockwise in fig. 3, and the swung positions of the first intermediate pulley 30 and the intermediate pulley support base 31 are shown by the two-dot chain line in fig. 3. Therefore, the axial displacement of the wire outgoing position or the wire incoming position is adapted, so that the acting force on the pulling-up steel wire rope 81 is reduced, the service load of the pulling-up steel wire rope 81 is reduced, and the service life of the pulling-up steel wire rope 81 is prolonged.

In one possible implementation manner, the method further includes: a middle pulley stop, fixedly disposed opposite the mast 70, is configured to limit movement of the first middle pulley 30 in a first direction.

Specifically, as shown in fig. 2, when the first middle pulley 30 and the mast 70 are slidably disposed along the first axis, the guide rail supports 33 at the two ends of the guide rail 32 can function as middle pulley stoppers to prevent the middle pulley support 31 from moving for an excessive distance, and further to restrict the sliding of the first middle pulley 30 along the first axis direction, i.e., restrict the movement of the first middle pulley 30 along the first direction.

When the first intermediate block 30 and the mast 70 are rotatably disposed along the second axis as shown in fig. 3, a limiting rod 35 may be disposed on the block support plate 34 as a limiting member of the first intermediate block 30 to limit the maximum swing angle of the first intermediate block 30, so as to limit the movement of the first intermediate block 30 in the first direction.

The middle pulley limiting part is arranged, so that the position, supporting the pulling steel wire rope 81, of the first middle pulley 30 can be prevented from moving for a large distance, the change of an included angle between the contact position of the pulling steel wire rope 81 and the top pulley 10 due to the axial change of the wire outgoing position and the wire incoming position of the pulling steel wire rope 81 is slowed down, the component force of the acting force, exerted on the top pulley 10 by the pulling steel wire rope 81, in the direction perpendicular to the paper surface is reduced, the moment, formed on the top of the mast 70, of the component force, which enables the mast 70 to topple is reduced, the shaking of the mast 70 is limited, and the construction safety is improved.

In one possible implementation manner, the method further includes: and a rope blocking lever 73 configured to block a movement of a part of the hoist rope 81 away from the mast 70.

By arranging the rope blocking rod 73, the pull-up steel wire rope 81 can be supported when the mast 70 is laid down, the abrasion of the steel wire rope and a chassis caused by the fact that the pull-up steel wire rope 81 drops to the chassis of the rotary drilling rig is prevented, and the service life of the pull-up steel wire rope 81 is prolonged.

In one possible implementation manner, the method further includes: and a bottom pulley 50 installed at the bottom of the mast 70, the bottom pulley 50 being configured to be wound by a pressure wire rope 82, a third end of the pressure wire rope 82 being connected to the winding drum 40, and a portion of the pressure wire rope 82 being wound around the winding drum 40, and a fourth end of the pressure wire rope 82 being connected to the power assembly 60.

The bottom pulley 50 is arranged and is also connected to the winding drum 40 by using the third end of the pressure steel wire rope 82, so that when the steel wire rope 81 is pulled up and wound, the pressure steel wire rope 82 can be simultaneously released, and the pressure steel wire rope 82 has enough stroke space when the power component 60 is pulled to move. When the pull-up steel wire rope 81 is released, the pressure steel wire rope 82 is wound to drive the power assembly 60 to move. The pulling steel wire rope 81 and the pressure steel wire rope 82 are connected with the winding drum 40, so that two functions can be realized when the winding drum 40 completes one action, and the action efficiency is improved.

In one possible implementation manner, the method further includes: a second middle pulley 20 installed at a middle portion of the mast 70, the second middle pulley 20 being configured to: the positions where the pressure wire 82 comes into and out of contact with the second intermediate sheave 20 are diametrically opposite positions of the second intermediate sheave 20. Wherein, in the radial direction, not only two positions are meant, but absolutely spaced apart by only 180 ° on the second intermediate pulley 20. Even spacing 175 deg., 170 deg., and even spacing 160 deg., can be considered relative positions in the radial direction.

The second middle pulley 20 is arranged, so that the pressure wire rope 82 winds around the second middle pulley 20, and the positions where the pressure wire rope 82 and the second middle pulley 20 start to contact and separate from contact are both opposite positions in the radial direction of the second middle pulley 20, so that the included angle between the pressure wire rope 82 between the second middle pulley 20 and the bottom pulley 50 and the length direction of the mast 70 can be reduced, namely the rope inlet angle of the bottom pulley 50 is also small. Since the tension on the pressure wire rope 82 is constant, the rope entry angle decreases, the sine value of the corresponding rope entry angle also decreases, and the component of the tension of the pressure wire rope 82 in the horizontal direction also decreases. That is, the lateral force of the pressure wire 82 on the bottom sheave 50 is reduced, and the stability of the mast 70 can be improved.

In one possible implementation, a pull-up wire rope fixing portion 71, provided at an upper portion of the mast 70, is configured to be fixedly connected with a second end of the pull-up wire rope 81; a pressure wire rope fixing part 72 provided at a lower portion of the mast 70 and configured to be fixedly connected to a fourth end of the pressure wire rope 82; the power assembly 60 further includes: a first movable sheave 61, located in the power assembly 60, configured to be passed around by a pull-up wire rope 81 between the top sheave 10 and the pull-up wire rope fixing portion 71; the second movable sheave 62 is located in the power module 60 and configured to be wound by the pressure wire 82 between the bottom sheave 50 and the pressure wire fixing portion 72.

By arranging the pull-up wire rope fixing portion 71 and the pressure wire rope fixing portion 72 and arranging the first movable pulley 61 and the second movable pulley 62 on the power assembly 60, a movable pulley block can be formed, and under the condition that the traction force of the winding drum 40 is not changed, the acting force applied to the power assembly 60 can be increased, so that the rotary excavating effect is improved.

The operation principle of the embodiment is as follows:

taking the case where the first movable pulley 61 and the second movable pulley 62 are not provided in the power unit 60 as an example, two wire ropes, one of which is the pull-up wire rope 81 and the other of which is the pressure wire rope 82, are wound around the drum 40. The pull-up wire rope 81 and the pressure wire rope 82 are wound around the drum 40 in the same direction, and are respectively located at both ends of the drum 40 in the axial direction from the rope outlet end of the drum 40. The first end of the pulling steel wire rope 81 is connected to the winding drum 40, the pulling steel wire rope 40 sequentially passes through the first middle pulley 30 and the top pulley 10, and the second end of the pulling steel wire rope 81 is connected to the power assembly 60. The third end of the pressure wire rope 82 is connected to the winding drum 40, the pressure wire rope 82 sequentially passes through the second middle pulley 20 and the bottom pulley 50, and the fourth end of the pressure wire rope 82 is connected to the power assembly 60.

When the power assembly 60 needs to be lifted, the winding drum 40 rotates, the pull-up wire rope 81 starts to be wound, the pull-up wire rope 81 wound on the winding drum 40 increases, and the wire inlet position of the pull-up wire rope 81 moves axially, for example, moves in a direction away from the observer along the paper surface of fig. 1. Similarly, the lower portion of the wire rope 81 is pulled up and moved away from the viewer on the paper surface of fig. 1. At this time, the pulling of the wire rope 81 pushes the right half of the first middle pulley 30 shown in fig. 2 to move upward, and accordingly, the first middle pulley 30 in the implementation shown in fig. 2 moves upward in fig. 3, or the first middle pulley 30 in the implementation shown in fig. 3 swings counterclockwise in fig. 2. At this time, in fig. 1, the pull-up wire 81 on the right side of the top sheave 10 is decreased, and the power unit 60 is pulled up by the pull-up wire 81.

Due to the winding of the drum 40, on the other hand, the pressure wire 82 wound around the drum 40 is also released, and the pressure wire 82 runs to the right of the bottom pulley 50 in fig. 1 through the second middle pulley 20 and the bottom pulley 50. During the lifting process of the power assembly 60, the pressure steel wire rope 82 below the power assembly 60 is increased, so that the pressure steel wire rope 82 exerts a pulling force on the power assembly 60 to descend during the descending process of the power assembly 60.

Another implementation of the present application further provides a rotary drilling rig, comprising: a chassis; the slewing mechanism is arranged on the chassis; the rotary platform is connected with the rotary mechanism; and the rotary drilling rig pressurizing device is arranged on the rotary platform. When the rotary drilling rig is used, the mast can be erected, and when the rotary drilling rig does not perform 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 steel wire rope cannot be abraded with the chassis and the rotary platform, and the service life of the steel wire rope is prolonged.

The rotary drilling rig comprises the rotary drilling rig pressurizing device in any one implementation mode, so that the technical effect of any rotary drilling rig pressurizing device is achieved, and the details are not repeated.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modifications, equivalents and the like that are within the spirit and principle of the present application should be included in the scope of the present application.

Claims (10)

1. A rotary drilling rig pressurizing device is characterized by comprising:

a mast;

a drum configured to connect a first end of a pull-up wire rope and to wind the pull-up wire rope;

the power assembly is movably connected with the mast and is connected with the second end of the pulling steel wire rope;

a top pulley mounted on the top of the mast, configured to be bypassed by the pull-up wire; and

a first middle pulley mounted at a middle of the mast and located between the drum and the top pulley, configured to: the part of one side, facing the power assembly, of the first middle pulley supports the pull-up steel wire rope between the winding drum and the top pulley.

2. The rotary drilling rig pressurizing device as recited in claim 1, wherein the first middle pulley is rotatably connected with the mast along a first axis of the first middle pulley, and the first middle pulley is connected with the mast for relative movement along a first direction, and the connection for relative movement along the first direction is configured to: and the part of the first middle pulley, which is in contact with the pull-up steel wire rope, can move perpendicular to the plane of the first middle pulley.

3. The rotary drilling rig pressurizing device as recited in claim 2, wherein the first middle pulley is slidably disposed relative to the mast along the first axis of the first middle pulley.

4. The rotary drilling rig pressurizing device as recited in claim 2, wherein the first middle pulley and the mast are rotatably arranged along a second axis, and the direction of the second axis is consistent with the length direction of the mast.

5. The rotary drilling rig pressurizing device according to any one of claims 2-4, further comprising:

a middle pulley stop fixedly disposed opposite the mast configured to limit movement of the first middle pulley in the first direction.

6. The rotary drilling rig pressurizing device according to claim 1, further comprising:

a rope blocking lever configured to block movement of a part of the pull-up wire rope away from the mast.

7. The rotary drilling rig pressurizing device according to claim 1, further comprising:

the bottom pulley is installed at the bottom of the mast and is configured to be wound by a pressure steel wire rope, the third end of the pressure steel wire rope is connected to the winding drum, part of the pressure steel wire rope is wound on the winding drum, and the fourth end of the pressure steel wire rope is connected with the power assembly.

8. The rotary drilling rig pressurizing device according to claim 7, further comprising:

a second middle pulley mounted at a middle of the mast, the second middle pulley configured to: the positions where the pressure wire rope comes into and out of contact with the second middle sheave are diametrically opposite positions of the second middle sheave.

9. The rotary drilling rig pressurizing device according to claim 7 or 8,

a pull-up wire rope fixing part disposed at an upper portion of the mast and configured to be fixedly connected to a second end of the pull-up wire rope;

the pressure steel wire rope fixing part is arranged at the lower part of the mast and is constructed to be fixedly connected with the fourth end of the pressure steel wire rope;

the power assembly further includes:

a first movable sheave in the power assembly configured to be passed around by the pull-up wire rope between the top sheave and the pull-up wire rope fixing portion;

a second movable sheave in the power assembly configured to be bypassed by the pressure wire rope between the bottom sheave and the pressure wire rope fixing portion.

10. A rotary drilling rig, characterized by comprising:

a chassis;

the slewing mechanism is arranged on the chassis;

the rotary platform is connected with the rotary mechanism; and

the rotary drilling rig pressurizing device of any one of claims 1-9, mounted on the rotary platform.

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