CN204754795U - Rotary Drilling Rig - Google Patents

Abstract

The utility model provides a rotary drilling rig, including rotary platform and the back landing leg device of setting on rotary platform, back landing leg device includes the supporting seat of back landing leg and installation back landing leg, the supporting seat is fixed on rotary platform, the supporting seat includes supporting baseplate and the upside baffle that is located the supporting baseplate top, back landing leg is including preventing the board and being located the mounting panel of preventing the board below that falls, it is located the top of upside baffle to prevent the board that falls, the mounting panel is located the below of supporting baseplate, the supporting baseplate is equipped with first fixed orifices, the mounting panel be equipped with first fixed orifices complex second fixed orifices, it will supporting baseplate and mounting panel fixed connection to be equipped with the fastener in first fixed orifices and the second fixed orifices. The utility model discloses a dig back landing leg device of rig soon has the ability of bearing great load, and complete machine stability is better, has improved the pore-forming precision to avoid the bolt atress of counter weight and fixed counter weight, promoted the security of digging the rig soon.

Description

Rotary Drilling Rig

technical field

The utility model relates to the technical field of engineering machinery, in particular to a rotary drilling rig.

Background technique

Rotary drilling rig is a basic construction equipment with strong applicability, high degree of automation, high hole forming efficiency and low environmental pollution. The rotary drilling rig is composed of a crawler chassis, a boarding part, a mast assembly, a drilling system and a hydraulic system. The crawler chassis is used for moving, and the boarding part and others are used for drilling operations.

In the construction process of the rotary drilling rig, in order to maintain the balance of the fuselage, a counterweight structure is set on the slewing platform of the upper part of the car to move the center of gravity of the rotary drilling rig to the relatively rear. The fuselage does not tilt forward when lifting, and it must be ensured that the fuselage of the rotary drilling rig does not turn backward when drilling. However, when using a rotary drilling rig to drill into a harder formation (such as rock), the drilling pressure of the rotary drilling rig should be significantly increased. Lifting the front part of the fuselage will affect the stability of the rotary drilling rig, and when the front part of the fuselage is lifted, the drilling pressure cannot be further improved, and the hole forming accuracy will also be affected. In order to solve the above problems, the usual practice in the industry is to set up legs that can be supported on the ground on the counterweight of the rotary drilling rig. The fuselage forms a support to improve the stability of the rotary drilling rig.

The Chinese patent application number CN201120344606.9 discloses a counterweight structure and a rotary drilling rig. The counterweight of the rotary drilling rig is provided with two support seats and two oil cylinders respectively arranged on the support seats. The oil cylinder body is connected with the counterweight, and the lower end of the piston rod of each oil cylinder is respectively connected with the corresponding support seat to form mutually independent legs, and the extension length of each leg is controlled by the oil cylinder to adapt to the uneven ground. The legs of this rotary drilling rig are combined with the counterweight. When the rotary drilling rig is drilling, the upward reaction force from the ground is transmitted to the counterweight through the outriggers, and then the counterweight transmits the force to the rotary platform. The counterweight Generally, the rotary platform is connected by bolts, which causes the connecting bolts between the counterweight and the rotary platform to be subjected to a large tension, and the bolts may be loosened or broken, which makes the rotary drilling rig a certain safety hazard.

Utility model content

The preferred embodiment of the utility model provides a rotary drilling rig, the rear outrigger device has the ability to bear a large load, the stability of the whole machine is good, the hole forming accuracy is improved, and the counterweight and fixed counterweight are avoided. The heavy bolts are stressed, which improves the safety of the rotary drilling rig.

The utility model solves its technical problem and adopts the following technical solutions to realize.

A rotary drilling machine comprises a rotary platform and a rear outrigger device arranged on the rotary platform. The rear outrigger device comprises a rear outrigger and a support base for installing the rear outrigger, and the support base is fixed on the revolving platform. The support base includes a support base plate and an upper side baffle above the support base plate. The rear outrigger includes an anti-fall plate and a mounting plate positioned below the anti-fall plate, the anti-fall plate is positioned above the upper side baffle, and the mounting plate is positioned below the support base plate. The supporting bottom plate is provided with a first fixing hole, and the mounting plate is provided with a second fixing hole matched with the first fixing hole. Fasteners are provided in the first fixing hole and the second fixing hole to fix and connect the supporting bottom plate and the mounting plate.

In a preferred embodiment of the present utility model, the number of the above-mentioned supporting bases and the rear outriggers are each two, and the rotary platform has two longitudinal beams, the two supporting bases are respectively fixed on the two longitudinal beams, and the two rear supporting legs Installed on two supporting bases respectively.

In a preferred embodiment of the present utility model, the above-mentioned support seat further includes a first side plate and a second side plate, the first side plate and the second side plate are arranged on the support bottom plate at intervals, and the upper side baffle plate is connected to the first side plate and second side panel.

In a preferred embodiment of the present utility model, the above-mentioned supporting bottom plate is protrudingly provided with a connecting portion, the longitudinal beam of the slewing platform has a bottom plate, a top plate and a side plate, the connecting portion of the supporting bottom plate is welded to the bottom plate of the longitudinal beam, the first side plate, the second One end of the side plate close to the stringer is welded to the bottom plate, side plate and top plate of the stringer.

In a preferred embodiment of the utility model, a plurality of reinforcing ribs are arranged at intervals on the surface of the above-mentioned supporting bottom plate close to the upper side baffle, and one end of the reinforcing rib close to the longitudinal beam is welded to the bottom plate, side plate and top plate of the longitudinal beam.

In a preferred embodiment of the utility model, the above-mentioned support base has a mounting through hole, and the installation through hole is located at the end of the support base away from the longitudinal beam and simultaneously passes through the upper side baffle plate and the support base plate. There is a first notch at the end of the support bottom plate away from the longitudinal beam, and a second notch at the end of the upper side baffle far away from the longitudinal beam, the rear leg is installed into the installation through hole through the first notch and the second notch, and the support seat also includes a support seat The cover, the support cover is detachably connected to the ends of the first side plate and the second side plate away from the longitudinal beam, and the support cover seals the first gap and the second gap.

In a preferred embodiment of the present invention, the above-mentioned rear leg includes an external fixing cylinder and an oil cylinder casing, the upper end of the external fixing cylinder is provided with lifting lugs, and the anti-drop plate and the mounting plate are arranged outside the lower end of the external fixing cylinder.

In a preferred embodiment of the utility model, the above-mentioned oil cylinder casing includes a protective cylinder and a limit plate arranged at the lower end of the protective cylinder, and the rear outriggers also include outrigger feet, which are located under the protective cylinder.

In a preferred embodiment of the present utility model, the above-mentioned rotary drilling rig includes a counterweight arranged on the rotary platform, the side of the counterweight has concave holes, and the counterweight includes a counterweight body and sequentially connected first legs located on the counterweight body The tube vertical plate, the second outrigger tube vertical plate and the third outrigger tube vertical plate, the first outrigger tube vertical plate, the second outrigger tube vertical plate and the third outrigger tube vertical plate form a concave hole, and the rear support Dimpled legs.

In a preferred embodiment of the present utility model, a baffle plate is also provided at the opening of the above-mentioned concave hole, and the baffle plate is connected between the vertical plate of the first leg tube and the vertical plate of the third leg tube, and the vertical plate of the first leg tube 1. The vertical plate of the second outrigger tube, the vertical plate of the third outrigger tube and the baffle are provided with through holes, and a pressure piece is arranged in the through hole, and the pressure piece leans against the outer fixing cylinder.

The rear outrigger device of the rotary drilling rig of the present utility model includes a rear outrigger and a support base for installing the rear outrigger. The support base is fixed on the rotary platform. The outriggers include an anti-fall plate and a mounting plate located below the anti-fall plate. The anti-fall plate is located above the upper side baffle, and the mounting plate is located below the supporting base plate. The supporting base plate is provided with a first fixing hole, and the mounting plate is provided with a A second fixing hole matched with the first fixing hole, fasteners are provided in the first fixing hole and the second fixing hole to connect the support base plate and the installation plate fixedly. The rear outrigger of the rotary drilling rig is set on the rotary platform. When the rotary drilling rig is drilling, the upward reaction force of the ground is directly transmitted to the rotary platform by the support seat through the rear outrigger. The rear outrigger device has the ability to bear large loads , which plays an important role in balancing the stability of the whole machine and improves the hole forming accuracy, and the force contact surface between the rear outrigger and the slewing platform is the mounting plate and the supporting bottom plate, which avoids the stress of the counterweight and the bolts fixing the counterweight. force, which improves the safety of the rotary drilling rig.

In order to make the advantages of the utility model clearer, the following will further describe the implementation of the utility model in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is a schematic structural view of a rotary drilling rig in a preferred embodiment of the present invention.

Fig. 2 is a schematic structural view of the support seat of the preferred embodiment of the present invention.

Fig. 3 is a schematic diagram of the structure of the supporting seat installed on the rotary platform in a preferred embodiment of the utility model.

Fig. 4 is a schematic structural view of the rear outrigger in a preferred embodiment of the present invention.

Fig. 5 is a structural schematic diagram after the rear outrigger is installed on the basis of Fig. 3 .

Fig. 6 is a structural schematic diagram of a counterweight in a preferred embodiment of the present invention.

Fig. 7 is a structural schematic diagram after the counterweight is installed on the basis of Fig. 5 .

Detailed ways

In order to further explain the technical means and effects of the utility model to achieve the intended purpose of the utility model, the specific implementation, structure, characteristics and functions of the rotary drilling rig proposed according to the utility model will be described below in conjunction with the accompanying drawings and preferred embodiments. Its efficacy is described in detail as follows:

The aforementioned and other technical contents, features and effects of the present utility model will be clearly presented in the following detailed description of preferred embodiments with reference to the drawings. Through the description of the specific implementation mode, the technical means and effects of the utility model to achieve the predetermined purpose can be understood more deeply and specifically, but the attached drawings are only for reference and description, and are not used to explain the utility model. new restrictions.

Fig. 1 is the structure schematic diagram of the rotary drilling rig of the preferred embodiment of the utility model, please refer to Fig. 1, the rotary drilling rig 100 comprises a crawler chassis 101, a rotary platform 102, a driver's cab 103, a luffing mechanism 104, a mast 105, a power head 106 , drilling rod 107 , drilling tool 108 , rear outrigger device 200 and counterweight 300 . Wherein, the slewing platform 102 is arranged on the crawler chassis 101, the cab 103, the rear outrigger device 200 and the counterweight 300 are arranged on the slewing platform 102, the mast 105 is arranged at the front end of the rotary drilling rig 100, and one end of the luffing mechanism 104 It is pivotally connected to the slewing platform 102, and the other end is pivotally connected to the mast 105. The power head 106 is set on the mast 105. The drill rod 107 is sleeved on the power head 106 and rotates under the drive of the power head 106. The drilling tool 108 is installed on the drill The bottom of rod 107 and under the drive of drill rod 107, carry out drilling operation.

Fig. 2 is a schematic structural view of a support seat of a preferred embodiment of the present utility model, and Fig. 3 is a schematic structural view of a support seat of a preferred embodiment of the present utility model installed on a rotary platform, for simplicity of illustration, Fig. 3 and hereinafter Both Fig. 5 and Fig. 7 do not show structures such as cab 103, luffing mechanism 104 and mast 105 arranged on slewing platform 102. Please refer to FIG. 2 and FIG. 3 together. The rear outrigger device 200 includes a rear outrigger 220 and a support base 210 for installing the rear outrigger 220 . In this embodiment, the number of supporting bases 210 and rear legs 220 is two each, and the rotary platform 102 has two longitudinal beams 102a for setting the counterweight 300, and the two supporting bases 210 are respectively fixed on the two longitudinal beams. 102a, the two rear legs 220 are installed on the two supporting bases 210 respectively.

Specifically, the supporting seat 210 includes a supporting bottom plate 211 , a first side plate 212 , a second side plate 213 and an upper side baffle 214 . The first side plate 212 and the second side plate 213 are spaced apart from each other on the support base plate 211 , and the upper side plate 214 is disposed above the support base plate 211 and connects the first side plate 212 and the second side plate 213 . Further, a plurality of reinforcing ribs 215 are arranged at intervals on the surface of the supporting base 211 close to the upper side baffle 214 . The supporting bottom plate 211 also protrudes from a connecting portion 211a. As shown in Figure 5, the longitudinal beam 102a of the rotary platform 102 has a bottom plate 1021, a top plate 1022 and two side plates 1023. In this embodiment, the connecting portion 211a of the supporting bottom plate 211 is welded to the lower surface of the bottom plate 1021 of the longitudinal beam 102a, One end of the first side plate 212, the second side plate 213 and the rib 215 near the longitudinal beam 102a is welded to the bottom plate 1021, the side plate 1023 and the top plate 1022 of the longitudinal beam 102a, that is, the first side plate 212 and the second side plate 213 The end surface of the reinforcing rib 215 close to the longitudinal beam 102a has a shape matching the outer contours of the bottom plate 1021 , the side plate 1023 and the top plate 1022 of the longitudinal beam 102a and overlaps the longitudinal beam 102a.

In order to meet the requirements of component selection and space structure in this embodiment, two support bases 210 on the left and right are independently designed and welded with the rotary platform 102. Holes are drilled and threads are processed, and then the rear outrigger 220 is assembled with the rotary platform 102 . In other embodiments, the manner in which the support base 210 is fixed to the rotary platform 102 is not limited to the above, and the structure and size of the two support bases 210 can also be adjusted according to actual conditions.

The support base 210 has a mounting through hole 210a, which is located at an end of the support base 210 away from the longitudinal beam 102a and simultaneously passes through the upper side baffle plate 214 and the support base plate 211 . Specifically, the end of the support base plate 211 away from the longitudinal beam 102a has a first notch 211b, the end of the upper side baffle 214 away from the longitudinal beam 102a has a second notch 214a, and the rear leg 220 is installed through the first notch 211b and the second notch 214a Into the installation through hole 210a, the support seat 210 also includes a support cover 217, the support cover 217 is detachably connected to the ends of the first side plate 212 and the second side plate 213 away from the longitudinal beam 102a, and the support cover 217 is formed by the support cover. 217 seals the first gap 211b and the second gap 214a. In this embodiment, a connecting plate 216 is provided at the ends of the first side plate 212 and the second side plate 213 away from the longitudinal beam 102a, and the support cover 217 is connected to the first side plate 212 and the second side plate 216 through the connecting plate 216. Board 213. The outer edge of the support base 211 in three directions forming the first notch 211b also has a first fixing hole 211c, which is, for example, a threaded hole for fixing the rear leg 220 .

A limit switch seat 218 is also mounted on the first side plate 212 . The limit switch seat 218 is used for installing limit switches of electrical components, and controls the rear support leg 220 to stop stretching when it stretches upward to a limited position.

Fig. 4 is a schematic diagram of the structure of the rear outrigger in a preferred embodiment of the utility model, and Fig. 5 is a schematic diagram of the structure after the rear outrigger is installed on the basis of Fig. 3, please refer to Fig. 4 and Fig. 5 together, the rear outrigger The number of 220 is two, which are respectively arranged on the two supporting bases 210 . The rear leg 220 includes an outer fixing cylinder 221 , an oil cylinder casing 222 , an upper sealing plate 223 , lifting lugs 224 , an anti-drop plate 225 , a mounting plate 226 and a leg foot 227 .

The outer fixing cylinder 221 is composed of four similarly shaped outer cylinder vertical plates 221a welded, the upper sealing plate 223 is arranged on the upper end of the outer cylinder vertical plate 221a, and the lifting lug 224 is arranged on the upper sealing plate 223, which facilitates the installation of the rear support leg 220. Or lift during disassembly. The anti-falling plate 225 and the mounting plate 226 are disposed outside the lower end of the outer fixing cylinder 221 , and the anti-falling plate 225 is located above the mounting plate 226 . The mounting plate 226 is provided with a second fixing hole 226 a matched with the first fixing hole 211 c on the supporting base 211 . When the rear leg 220 is installed on the support base 210, the anti-drop plate 225 is located above the upper side baffle plate 214 of the support base 210 to prevent the rear support leg 220 from falling from the support base 210, and the mounting plate 226 is located on the support base plate of the support base 210 211, and use fasteners such as bolts to pass through the second fixing hole 226a of the mounting plate 226 and the first fixing hole 211c of the supporting base plate 211 from bottom to top to securely connect the mounting plate 226 and the supporting base plate 211. Afterwards, the support cover 217 is connected between the connection plates 216 at the ends of the first side plate 212 and the second side plate 213 , and the rear leg 220 is disposed in the installation through hole 210 a of the support base 210 .

The oil cylinder casing 222 is arranged in the channel surrounded by the four outer cylinder vertical plates 221a of the outer fixing cylinder 221. The outer fixing cylinder 221 and the oil cylinder casing 222 are connected through the oil cylinder. Driven by the oil cylinder, the oil cylinder casing 222 can move along the outer The channel of the fixed cylinder 221 reciprocates. The cylinder casing 222 includes a protection cylinder 222a and a limit plate 222b arranged at the lower end of the protection cylinder 222a. The cylinder casing 222 is used to protect the cylinder and guide the linear motion of the cylinder to prevent the cylinder from inclining when the cylinder stretches. When the oil cylinder casing 222 contracts upwards, the upper limit plate 222b of the oil cylinder casing 222 also moves upwards at the same time. The cylinder stops moving.

The rear leg 220 also includes a leg foot 227 positioned below the protective cylinder 222a. The end of the oil cylinder has a connection ball head, and the outrigger foot 227 has a groove matching the connection ball head, and the outrigger foot 227 is rotatably connected to the oil cylinder through the connection ball head. The outrigger feet 227 can be disassembled independently. When the rear outrigger 220 is stretched out and lowered to the ground, the outrigger feet 227 contact the ground to expand the supporting area.

The rear outrigger device 200 of this embodiment has two rear outriggers 220 which can be retracted up and down simultaneously or independently. In other embodiments, the two rear outriggers 220 can also be connected to each other.

The counterweight 300 is arranged at the end of the two longitudinal beams 102 a of the slewing platform 102 away from the mast 105 . Fig. 6 is a schematic structural view of a counterweight in a preferred embodiment of the present invention, and Fig. 7 is a schematic structural view of a counterweight installed on the basis of Fig. 5, please refer to Fig. 6 and Fig. 7 together, in this embodiment, In order to increase space utilization, two U-shaped recessed holes 310 are opened on the side of the counterweight 300 facing the direction of the mast 105 for placing the rear legs 220 . The counterweight 300 comprises a counterweight body 301 and a first outrigger tube vertical plate 311, a second outrigger tube vertical plate 312 and a third outrigger tube vertical plate 313 which are successively connected on the counterweight body 301. The tube vertical plate 311 , the second outrigger tube vertical plate 312 and the third outrigger tube vertical plate 313 enclose a concave hole 310 , and the rear leg 220 is penetrated in the concave hole 310 . After the rear outrigger 220 is installed on the slewing platform 102 , align the two concave holes 310 of the counterweight 300 with the position of the rear outrigger 220 and install the counterweight 300 on the slewing platform 101 . The recessed hole 310 provides the space required to place the rear leg 220, and there will be a certain gap between the two after the rear leg 220 is placed in the recessed hole 310. In order to further fix the rear leg 220 so that it will not shake, a counterweight A baffle 314 is also provided at the opening of the concave hole 310 of 300 . In this embodiment, the baffle 314 is connected between the first leg tube vertical plate 311 and the third leg tube vertical plate 313 . Further, through holes such as threaded holes are provided on the first leg tube vertical plate 311, the second leg tube vertical plate 312, the third leg tube vertical plate 313 and the baffle plate 314, and pressure-resisting holes are provided in the through holes. Parts 315 , such as bolts, lean against the four outer cylinder vertical plates 221 a of the outer fixing cylinder 221 of the rear support leg 220 to guide and fix the rear support leg 220 .

The rotary drilling rig 100 has certain requirements on the verticality of the hole, which requires the whole machine to have certain stability. Under pressure, the drilling tool 108 is subjected to an upward reaction force and the load torque increases at this time, the reaction force and torque are transmitted to the rotary drilling rig 100 through the drill rod 107, and the support seat 210 is set on the rotary platform 102 of the rotary drilling rig 100, The support seat 210 includes a support base plate 211 and an upper side baffle 214 above the support base 211, and the rear leg 220 includes an anti-fall plate 225 and a mounting plate 226 below the anti-fall plate 225, and the anti-fall plate 225 is located on the upper side baffle 214, the mounting plate 226 is located below the support base plate 211, the support base plate 211 is provided with a first fixing hole 211c, the mounting plate 226 is provided with a second fixing hole 226a matched with the first fixing hole 211c, the first fixing hole 211c and Fasteners are provided in the second fixing hole 226a to fix the support base plate 211 and the mounting plate 226. When the rotary drilling rig 100 is drilling, the upward reaction force from the ground is directly transmitted to the rotary platform by the support base 210 through the rear leg 220. 102. The rear outrigger device 200 has the ability to bear a large load, which plays an important role in balancing the stability of the whole machine and improves the hole forming accuracy, and the force-bearing contact surface between the rear outrigger 220 and the rotary platform 102 is installed The plate 226 and the supporting bottom plate 211 avoid stress on the counterweight 300 and the bolts fixing the counterweight 300 , improving the safety of the rotary drilling rig 100 .

The above is only an embodiment of the utility model, and does not limit the utility model in any form. Although the utility model has been disclosed as above with the embodiment, it is not used to limit the utility model. Anyone who is familiar with this field Skilled persons, without departing from the scope of the technical solution of the present utility model, may use the disclosed technical content to make some changes or modify equivalent embodiments with equivalent changes, but if they do not depart from the technical solution of the present utility model, according The technical essence of the utility model makes any simple modifications, equivalent changes and modifications to the above embodiments, all still belong to the scope of the technical solution of the utility model.

Claims (10)

1. A rotary drilling rig (100), comprising a rotary platform (102) and a rear outrigger device (200) arranged on the rotary platform (102), characterized in that the rear outrigger device (200) It includes a rear outrigger (220) and a support base (210) for installing the rear outrigger (220), the support base (210) is fixed on the rotary platform (102), and the support base (210) includes The support base (211) and the upper side baffle (214) above the support base (211), the rear legs (220) include an anti-fall plate (225) and a The installation plate (226), the anti-drop plate (225) is located above the upper side baffle (214), the installation plate (226) is located below the support base plate (211), and the support base plate (211) is provided with a first fixing hole (211c), and the mounting plate (226) is provided with a second fixing hole (226a) matched with the first fixing hole (211c), and the first fixing hole (211c ) and the second fixing hole (226a) are provided with fasteners to securely connect the supporting bottom plate (211) and the mounting plate (226). 2. The rotary drilling rig according to claim 1, characterized in that, the number of the support base (210) and the rear legs (220) is two each, and the rotary platform (102) has two A longitudinal beam (102a), the two support seats (210) are respectively fixed on the two longitudinal beams (102a), and the two rear legs (220) are respectively installed to the two support seats ( 210) on. 3. The rotary drilling rig according to claim 2, characterized in that, the support base (210) further comprises a first side plate (212) and a second side plate (213), and the first side plate (212 ) and the second side plate (213) are arranged on the support bottom plate (211) at intervals, and the upper side plate (214) connects the first side plate (212) and the second side plate (213). 4. The rotary drilling rig according to claim 3, characterized in that, the supporting bottom plate (211) protrudes from a connecting portion (211a), and the longitudinal beam (102a) of the rotary platform (102) has a bottom plate (1021 ), a top plate (1022) and a side plate (1023), the connecting portion (211a) of the supporting bottom plate (211) is welded to the bottom plate (1021) of the longitudinal beam (102a), and the first side The plate (212), the second side plate (213) is welded to the bottom plate (1021) of the longitudinal beam (102a), the side plate (1023) and the the top plate (1022). 5. The rotary drilling rig according to claim 4, characterized in that, a plurality of reinforcement ribs (215) are arranged at intervals on the surface of the support base plate (211) close to the upper side baffle plate (214), and the reinforcement The rib (215) is welded to the bottom plate (1021), the side plate (1023) and the top plate (1022) of the longitudinal beam (102a) near the end of the longitudinal beam (102a). 6. The rotary drilling rig according to claim 3, characterized in that, the support base (210) has an installation through hole (210a), and the installation through hole (210a) is located at a distance from the support base (210) One end of the longitudinal beam (102a) passes through the upper side baffle plate (214) and the support base plate (211) at the same time, and the end of the support base plate (211) away from the longitudinal beam (102a) has a first gap (211b), the end of the upper side baffle (214) away from the longitudinal beam (102a) has a second notch (214a), and the rear leg (220) passes through the first notch (211b) and the The second notch (214a) is installed into the installation through hole (210a), and the support seat (210) also includes a support cover (217), and the support cover (217) is detachably connected to the The end of the first side plate (212) and the second side plate (213) away from the longitudinal beam (102a), the support cover (217) connects the first notch (211b) and the second Two gaps (214a) are sealed. 7. The rotary drilling rig according to claim 1, characterized in that, the rear support leg (220) comprises an outer fixing cylinder (221) and an oil cylinder casing (222), and the upper end of the outer fixing cylinder (221) Hanging ears (224) are provided on the upper part, and the anti-drop plate (225) and the installation plate (226) are arranged outside the lower end of the outer fixing cylinder (221). 8. The rotary drilling rig according to claim 7, characterized in that, the oil cylinder casing (222) comprises a protection cylinder (222a) and a limiting plate ( 222b), the rear outrigger (220) further includes outrigger feet (227), and the outrigger feet (227) are located under the protection cylinder (222a). 9. The rotary drilling rig according to claim 7, characterized in that, the rotary drilling rig (100) comprises a counterweight (300) arranged on the rotary platform (102), and the counterweight (300) There is a concave hole (310) on the side of the counterweight (300), and the counterweight (300) includes a counterweight body (301) and a first outrigger vertical plate (311) connected in sequence on the counterweight body (301), a second Outrigger vertical plate (312) and the third outrigger vertical plate (313), the first outrigger vertical plate (311), the second outrigger vertical plate (312) and the third The upright plate (313) of the outrigger tube surrounds the concave hole (310), and the rear leg (220) passes through the concave hole (310). 10. The rotary drilling rig according to claim 9, characterized in that, a baffle (314) is provided at the opening of the concave hole (310), and the baffle (314) is connected to the first branch Between the leg tube vertical plate (311) and the third leg tube vertical plate (313), the first leg tube vertical plate (311), the second leg tube vertical plate (312), the A through hole is provided on the third outrigger vertical plate (313) and the baffle plate (314), and a pressing member (315) is arranged in the through hole, and the pressing member (315) leans against The external fixing cylinder (221).