Core drilling rig mast

Abstract

The invention discloses a core drilling rig mast, and relates to the technical field of core drilling rig masts, wherein a first pulley is arranged on the outside of a mast outer tube, a second pulley is arranged on the outside of a mast middle tube, one end of a chain rope one is connected to the bottom of the mast middle tube, the chain rope one passes through the first pulley, the other end of the chain rope one is connected to a driving device, one end of a chain rope two is connected to the bottom of a mast inner tube, the chain rope two passes through the second pulley, the other end of the chain rope two is connected to the top of the mast outer tube, a first delay pin is arranged on the mast outer tube, and a second delay pin is arranged on the mast middle tube; after the driving device drives the mast inner tube and the mast middle tube to extend in place, the first delay pin and the second delay pin are extended to achieve locking; when the first delay pin and the second delay pin are retracted, the mast inner tube is retracted into the mast middle tube, and the mast middle tube is retracted into the mast outer tube. The invention has a compact structure, can meet the demand for mast length when the drilling rig is working, and can change the mast length when the drilling rig is transported and transferred.

Description

Technical Field

[0001] The invention relates to the technical field of core drilling rig masts, in particular to a core drilling rig mast. Background Art

[0002] The role of core drilling rigs in prospecting breakthroughs is becoming more and more obvious. In order to meet the needs of diamond drilling, core drilling rigs have gradually developed from vertical shaft drilling rigs to fully hydraulic drilling rigs. Core drilling rigs have a long feed stroke, which effectively solves the defects of vertical shaft drilling rigs such as short feed stroke, long auxiliary time for parking and reversing, high probability of in-hole accidents and low overall efficiency. It is conducive to improving drilling efficiency, reducing auxiliary time and in-hole accidents such as core blockage. Through the hydraulic control system, the drilling rig feed control can realize various working states such as pressurized drilling, deadweight drilling, decompression drilling, fast and slow lifting and lowering.

[0003] In order to meet the needs of transportation and transfer, the core drilling rig needs to be able to quickly change the length of the mast, so as to facilitate the transportation, installation and commissioning of the drilling rig. At present, most of the existing drilling rig masts in China adopt the form of folding the rotating axis. The longer the mast is, the larger the rotation radius is. When changing the state of the mast, the larger the rotation space is, the greater the labor intensity is, and the efficiency is low. Summary of the invention

[0004] The purpose of the present invention is to provide a core drilling rig mast with a compact structure, which can not only meet the demand for mast length when the drilling rig is working, but also change the mast length when the drilling rig is transported and transferred, thereby facilitating transportation.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a core drilling rig mast, comprising a mast outer tube, a mast middle tube, a mast inner tube, a first pulley, a second pulley, a chain rope 1, a chain rope 2, a driving device, a first delay pin and a second delay pin, the mast middle tube is nested in the mast outer tube, the mast inner tube is nested in the mast middle tube, the first pulley is arranged on the outside of the mast outer tube, the second pulley is arranged on the outside of the mast middle tube, one end of the chain rope 1 is connected to the bottom of the mast middle tube, the chain rope 1 passes through the first pulley, and the other end of the chain rope 1 is connected to the driving device, the One end of chain rope 2 is connected to the bottom of the mast inner tube, and chain rope 2 passes through the second pulley. The other end of chain rope 2 is connected to the top of the mast outer tube. The first delay pin is arranged on the mast outer tube, and the second delay pin is arranged on the mast middle tube. After the driving device drives the mast inner tube and the mast middle tube to extend into place, the first delay pin and the second delay pin are extended to achieve locking. When the first delay pin and the second delay pin are retracted, the mast inner tube is retracted into the mast middle tube, and the mast middle tube is retracted into the mast outer tube.

[0007] Preferably, the first delay pin and the second delay pin have the same structure, and both include a top pin, an outer cylinder, a piston three, a main spring and a knob, and the top pin, the piston three and the main spring are all arranged in the outer cylinder, and the top pin and the piston three are respectively sealed and slidably connected to the outer cylinder, one end of the top pin can be extended from one end of the outer cylinder and is used to contact the mast middle tube or the mast inner tube, and the space formed by the other end of the top pin, the inner wall of the outer cylinder and one end of the piston three is filled with hydraulic oil, one end of the main spring is abutted against the other end of the piston three, and the other end of the main spring is abutted against the knob arranged at the other end of the outer cylinder.

[0008] Preferably, the first delay pin and the second delay pin further include a piston 1, a piston 2, a spring and a ball, wherein the piston 1, the piston 2, the ball and the spring are all arranged in the outer cylinder, the piston 1, the piston 2, the ball and the spring are all located between the top pin and the piston 3, the piston 1 and the piston 2 are respectively fixed relative to the outer cylinder, a first space is formed between the pin and the piston 1, a second space is formed between the piston 1 and the piston 2, a third space is formed between the piston 2 and the piston 3, and a first through hole is opened on the piston 1 and a plurality of second through holes, the piston 2 is provided with a third through hole, one end of the first through hole and one end of the second through hole are both connected to the first space, the other end of the first through hole, the other end of the second through hole and one end of the third through hole are all connected to the second space, the other end of the third through hole is connected to the third space, the ball and the spring are located between the piston 1 and the piston 2, one end of the spring is connected to the ball, and the other end of the spring is connected to one end of the piston 2, and under the action of the spring, the ball can close the other end of the first through hole.

[0009] Preferably, the outer wall of the bottom of the mast inner tube is provided with an inner tube slide plate support, and the inner tube slide plate support is provided with an inner tube circular arc groove and a first inclined surface, the inner tube circular arc groove is connected to the upper end of the first inclined surface, and the upper end of the first inclined surface is inclined inward.

[0010] Preferably, a limiting block is provided on the outer wall of the inner tube of the mast, and the limiting block is at the same height as the arc groove of the inner tube.

[0011] Preferably, the outer wall of the bottom of the mast middle tube is provided with a middle tube slide plate support, and the middle tube slide plate support is provided with a middle tube circular arc groove and a second inclined surface, the middle tube circular arc groove is connected to the upper end of the second inclined surface, and the upper end of the second inclined surface is inclined inward.

[0012] Preferably, an outer tube limiter is provided at the upper end of the outer tube of the mast, and a middle tube limiter is provided at the upper end of the middle tube of the mast, the outer tube limiter and the middle tube limiter have the same structure, and both the outer tube limiter and the middle tube limiter include a limiter body, two first limiter plates and two second limiter plates, the first inner wall, the second inner wall, the third inner wall and the fourth inner wall of the limiter body are arranged in sequence, the first inner wall and the third inner wall are arranged opposite to each other, the second inner wall and the fourth inner wall are arranged opposite to each other, the two first limiter plates are symmetrically arranged on the first inner wall and the third inner wall of the limiter body, the two second limiter plates are arranged on the second inner wall of the limiter body, and the two second limiter plates are located on both sides of the first pulley or the second pulley.

[0013] Preferably, the first pulley and the second pulley are respectively located on both sides of the mast inner tube.

[0014] Preferably, the chain rope 1 passes through the first notch of the side wall of the mast outer tube, and one end of the chain rope 1 is connected to the lower part of the mast middle tube;

[0015] The second chain rope passes through the second notch on the side wall of the mast middle tube, one end of the second chain rope is connected to the lower part of the mast inner tube, and the other end of the second chain rope is connected to the upper part of the mast outer tube.

[0016] Preferably, there are two first delay pins and two second delay pins, the two first delay pins are symmetrically arranged on the mast outer tube, and the two second delay pins are symmetrically arranged on the mast middle tube.

[0017] Compared with the prior art, the present invention has achieved the following technical effects:

[0018] The core drilling rig mast of the present invention adopts an upper, middle and lower three-section telescopic structure, which is convenient to move and transport and has good integrity. The telescopic mast is easy and convenient and can drill 45-90° inclined holes. The mast of the present invention has a simple structure, a reasonable design, a long service life, and can be raised and lowered efficiently and quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of the exterior of the core drilling rig mast of the present invention;

[0021] Figure 2 It is a schematic diagram of the interior of the core drilling rig mast of the present invention;

[0022] Figure 3 It is a front view of the outer tube of the mast of the present invention;

[0023] Figure 4 A side view of the outer tube of the mast of the present invention;

[0024] Figure 5 It is a schematic diagram of the outer tube limiter or the middle tube limiter of the present invention;

[0025] Figure 6 It is a front view of the middle tube of the mast of the present invention;

[0026] Figure 7 A side view of the mast mid-tube of the present invention;

[0027] Figure 8 It is a schematic diagram of the lower part of the middle tube of the mast of the present invention;

[0028] Fig. 9 It is a front view of the inner tube of the mast of the present invention;

[0029] Fig.10 A side view of the inner tube of the mast of the present invention;

[0030] Fig.11 It is a schematic diagram of the lower part of the inner tube of the mast of the present invention;

[0031] Fig.12 It is a schematic diagram of the internal structure of the delay pin of the present invention;

[0032] Among them: 1-mast outer tube, 1.1-outer tube limiter, 1.1.1-limiter body, 1.1.2-first limiter plate, 1.1.3-second limiter plate, 1.1.4-fourth inner wall, 1.2-outer tube pressure rope cover, 1.3-mast oblique support seat, 2-mast middle tube, 2.1-middle tube limiter, 2.2-middle tube pressure rope cover, 2.3-middle tube slide support, 2.4-limiter block, 3-mast Inner tube of rod, 3.1-inner tube pressure rope cover plate, 3.2-inner tube slide plate support, 4-overhead crane, 5-first pulley, 6-second pulley, 7-chain rope one, 8-chain rope two, 9-driving device, 10-delay pin, 10.1-thrust pin, 10.2-outer cylinder, 10.3-piston one, 10.4-spring, 10.5-piston two, 10.6-piston three, 10.7-main spring, 10.8-knob. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] The purpose of the present invention is to provide a core drilling rig mast with a compact structure, which can not only meet the demand for mast length when the drilling rig is working, but also change the mast length when the drilling rig is transported and transferred, thereby facilitating transportation.

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] like Figures 1 to 12As shown: This embodiment provides a core drilling rig mast, including a mast outer tube 1, a mast middle tube 2, a mast inner tube 3, a first pulley 5, a second pulley 6, a chain rope 1 7, a chain rope 2 8, a driving device 9, and a delay pin 10, the delay pin 10 includes a first delay pin and a second delay pin, the mast outer tube 1, the mast middle tube 2 and the mast inner tube 3 are all hollow structures, the mast outer tube 1, the mast middle tube 2 and the mast inner tube 3 are all cold-drawn, cold-bent special-shaped square tubes or other relatively regular square tubes, the mast inner tube 3 The upper end is used to set the overhead crane 4, the mast middle tube 2 is nested in the mast outer tube 1, the mast inner tube 3 is nested in the mast middle tube 2, a mast oblique support seat 1.3 is arranged on the upper end of one side of the mast outer tube 1, one end of the mast outer tube 1 is hinged on the mast support base, the first pulley 5 is arranged on the upper end of the outer side of the mast outer tube 1, and is located on the same side as the mast oblique support seat 1.3 and at its upper end, the second pulley 6 is arranged on the upper end of the outer side of the mast middle tube 2, and the first pulley 5 and the second pulley 6 are respectively located on both sides of the mast inner tube 3 , a chain rope 7 passes through a first notch in the side wall of the mast outer tube 1, one end of the chain rope 7 is fixed to the outer wall of the bottom of the mast middle tube 2 through a middle tube rope cover plate 2.2, the chain rope 7 passes through a first pulley 5, the other end of the chain rope 7 is connected to a driving device 9, a chain rope 2 8 passes through a second notch in the side wall of the mast middle tube 2, one end of the chain rope 2 8 is fixed to the outer wall of the bottom of the mast inner tube 3 through an inner tube rope cover plate 3.1, the chain rope 2 8 passes through a second pulley 6, the other end of the chain rope 2 8 is connected to the outer wall of the top of the mast outer tube 1 through The outer tube pressure rope cover 1.2 is fixed, and there are two first delay pins and two second delay pins respectively. The two first delay pins are symmetrically arranged on the upper part of the mast outer tube 1, and the two second delay pins are symmetrically arranged on the upper part of the mast middle tube 2; after the driving device 9 drives the mast inner tube 3 and the mast middle tube 2 to extend into place, the first delay pin and the second delay pin are extended to achieve locking; when the first delay pin and the second delay pin are retracted, the mast inner tube 3 is retracted into the mast middle tube 2, and the mast middle tube 2 is retracted into the mast outer tube 1.

[0037] Specifically, in this embodiment, the driving device 9 is a small hydraulic winch or a manual winch, the chain rope 1 7 and the chain rope 2 8 are both steel wire ropes, and the first pulley 5 and the second pulley 6 are both fixed pulleys.

[0038] In this embodiment, the first delay pin and the second delay pin have the same structure. The first delay pin and the second delay pin both include a top pin 10.1, an outer cylinder 10.2, a piston 10.3, a piston 2 10.5, a piston 3 10.6, a spring 10.4, a ball, a main spring 10.7 and a knob 10.8. The top pin 10.1, the piston 10.3, the piston 2 10.5, the ball, the spring 10.4, the piston 3 10.6 and the main spring 10.7 are all arranged in the outer cylinder 10.2, and the piston 10.3, the piston 2 10.5, the ball and the spring 10.4 are all located in the top pin 10.1. 10.1 and piston 3 10.6, sealing rings are arranged between the top pin 10.1 and the piston 3 10.6 and the inner wall of the outer cylinder 10.2, the top pin 10.1 and the piston 3 10.6 are respectively sealed and slidably connected with the outer cylinder 10.2, one end of the top pin 10.1 can extend from one end of the outer cylinder 10.2 and is used to contact the mast middle tube 2 or the mast inner tube 3, the piston 1 10.3 and the piston 2 10.5 are respectively fixed to the outer cylinder 10.2 by the retaining ring, a first space is formed between the pin shaft and the piston 1 10.3, and a second space is formed between the piston 1 10.3 and the piston 2 10.5 A third space is formed between piston two 10.5 and piston three 10.6, the first space, the second space and the third space are filled with hydraulic oil, a first through hole and a plurality of second through holes are provided on piston one 10.3, the first through hole is located at the center of piston one 10.3, a plurality of second through holes are evenly arranged along the circumference of piston one 10.3, and there are preferably three second through holes, a third through hole is provided on piston two 10.5, one end of the first through hole and one end of the second through hole are both connected to the first space, the other end of the first through hole, the other end of the second through hole and one end of the third through hole are all connected to the second space, and the third through hole is provided on piston one 10.3. The other end of the three-way hole is connected to the third space. The ball and the spring 10.4 are located between the piston one 10.3 and the piston two 10.5. The ball is preferably a steel ball. One end of the spring 10.4 is connected to the ball, and the other end of the spring 10.4 is connected to one end of the piston two 10.5. Under the action of the spring 10.4, the ball can close the other end of the first through hole. One end of the main spring 10.7 is against the other end of the piston three 10.6, and the other end of the main spring 10.7 is against the knob 10.8 arranged at the other end of the outer cylinder 10.2, and the knob 10.8 is threadedly connected to the outer cylinder 10.2.

[0039] In this embodiment, when the ejector pin 10.1 is suddenly retracted inward by an external force, due to the incompressibility of the hydraulic oil, the hydraulic oil will cause the ball to compress the spring 10.4, so that the hydraulic oil in the first space enters the second space through the first through hole and the second through hole, and then enters the third space through the third through hole, and the piston 3 10.6 moves downward, and the ejector pin 10.1 retracts at this time; when the external force is eliminated, the piston 3 10.6 is forced to move upward under the elastic force of the main spring 10.7, and the spring 10.4 causes the ball to block the first through hole, forming a one-way valve, and the hydraulic oil in the second space can only enter the first space through the second through hole. When the ejector pin 10.1 is compressed, the hydraulic oil passes through the first through hole and the second through hole, and the hydraulic oil can only pass through the second through hole when it flows back, and the flow area during the backflow becomes smaller, that is, the first delay pin shaft and the second delay pin shaft ejector pin 10.1 are quickly retracted and slowly extended.

[0040] In this embodiment, the outer wall of the bottom of the mast inner tube 3 is provided with two symmetrically arranged inner tube slide support members 3.2, and the inner tube slide support member 3.2 is provided with an inner tube circular arc groove and a first inclined surface, the inner tube circular arc groove is connected to the upper end of the first inclined surface (the end close to the overhead crane 4), and the upper end of the first inclined surface is inclined inward.

[0041] In this embodiment, the outer wall at the bottom of the mast middle tube 2 is provided with two symmetrically arranged middle tube slide plate supports 2.3, and the middle tube slide plate supports 2.3 are provided with a middle tube circular arc groove and a second inclined surface, the middle tube circular arc groove is connected to the upper end of the second inclined surface (the end close to the overhead crane 4), and the upper end of the second inclined surface is inclined inward.

[0042] In this embodiment, an outer tube stopper 1.1 is provided at the upper end of the mast outer tube 1, and a middle tube stopper 2.1 is provided at the upper end of the mast middle tube 2. The outer tube stopper 1.1 and the middle tube stopper 2.1 have the same structure. The outer tube stopper 1.1 and the middle tube stopper 2.1 both include a stopper body 1.1.1, two first stopper plates 1.1.2 and two second stopper plates 1.1.3. The first inner wall, the second inner wall, and the third stopper body 1.1.1 are The inner wall and the fourth inner wall 1.1.4 are arranged in sequence, the first inner wall and the third inner wall are arranged oppositely, the second inner wall and the fourth inner wall 1.1.4 are arranged oppositely, the two first limit plates 1.1.2 are symmetrically arranged on the first inner wall and the third inner wall of the limiter body 1.1.1, the two second limit plates 1.1.3 are arranged on the second inner wall of the limiter body 1.1.1, and the two second limit plates 1.1.3 are located on both sides of the first pulley 5 or the second pulley 6.

[0043] In this embodiment, the first limit plate 1.1.2 of the outer tube limit member 1.1 corresponds to the surface where the middle tube slide plate support member 2.3 and the limit block 2.4 are located, the first limit plate 1.1.2 of the outer tube limit member 1.1 fits with the outer wall of the mast middle tube 2 where the middle tube slide plate support member 2.3 is located, the limit block 2.4 fits with the inner wall of the mast outer tube 1, and the corresponding surface is also the same. Through the action of these two supporting points, the mast middle tube 2 will not swing in this direction. The second stop plate 1.1.3 of the outer tube stopper 1.1 can fit with the outer wall of the mast middle tube 2 where the middle tube pressure rope cover plate 2.2 is located, the middle tube pressure rope cover plate 2.2 fits with the inner wall of the mast outer tube 1 where the outer tube stopper 1.1.3 is located, the fourth inner wall 1.1.4 of the outer tube stopper 1.1 and the inner wall of the mast outer tube 1 corresponding to the fourth inner wall 1.1.4 are completely fitted with the outer wall corresponding to the mast middle tube 2, so that the mast middle tube 2 will not swing in this direction. The four outer walls of the mast middle tube 2 can always ensure that they are completely fitted with the four inner walls of the mast outer tube 1 regardless of whether they are actually extended or retracted.

[0044] In this embodiment, the first limit plate 1.1.2 of the middle tube limit member 2.1 corresponds to the surface where the inner tube slide plate support member 3.2 is located, the first limit plate 1.1.2 of the middle tube limit member 2.1 is in contact with the outer wall of the mast inner tube 3 where the inner tube slide plate support member 3.2 is located, and the lower part of the inner tube slide plate support member 3.2 is in contact with the inner wall of the mast middle tube 2, and the corresponding surface is also in contact with it. Through the action of these two supporting points, the mast inner tube 3 will not swing in this direction. The second stop plate 1.1.3 of the middle tube stopper 2.1 can fit with the outer wall of the mast inner tube 3 where the inner tube pressure rope cover plate 3.1 is located, the inner tube pressure rope cover plate 3.1 fits with the inner wall surface of the mast middle tube 2 where the middle tube stopper 1.1.3 is located, the fourth inner wall 1.1.4 of the middle tube stopper 2.1 and the inner wall of the mast middle tube 2 corresponding to the fourth inner wall 1.1.4 are completely fitted with the outer wall corresponding to the mast inner tube 3, so that the mast inner tube 3 will not swing in this direction. The four outer walls of the mast inner tube 3 can always ensure that they are completely fitted with the four inner walls of the mast middle tube 2 regardless of whether they are actually extended or retracted.

[0045] When the core drilling rig mast is in place, the driving device 9 winds the chain rope 7 around the drum of the driving device 9, forcing the mast middle tube 2 to rise. Since the second pulley 6 is fixed on the mast middle tube 2 and the two ends of the chain rope 8 are fixed, the mast inner tube 3 and the overhead crane 4 are driven to rise together during the rising process of the second pulley 6. When the core drilling rig mast rises to an appropriate position, the top pin 10.1 of the first delay pin shaft and the top pin 10.1 of the second delay pin shaft pop out, supporting the middle tube arc groove on the middle tube slide support 2.3 and the inner tube arc on the inner tube slide support 3.2 At the slot, the positions of the mast middle tube 2 and the mast inner tube 3 are kept fixed; when the core drilling rig mast needs to be lowered and retracted, the core drilling rig mast needs to be raised for a while first, and the top pin 10.1 of the first delay pin shaft and the top pin 10.1 of the first delay pin shaft will be retracted due to the rising of the second inclined surface of the outer tube slide support and the first inclined surface of the inner tube slide support 3.2. Due to the delayed telescopic function of the top pin 10.1, the drive device 9 is quickly reversed at this time, and the mast middle tube 2 and the mast inner tube 3 will be retracted under the action of gravity, thereby achieving the function of contracting the core drilling rig mast.

[0046] The vertical axis drilling rig generally has a feed stroke of 0.5 to 0.8 m, while the feed stroke of the core drilling rig mast rear drilling rig using the present embodiment can be 3 to 5 m, or even longer. During the drilling process, the general drilling footage is 3 to 4.5 m. The core drilling rig mast rear drilling rig using the present embodiment can be completed in one go without turning the rod, while the vertical axis drilling rig needs to turn the rod 7 to 9 times. According to the normal drilling footage of 4.5 m, a hole depth of 3000 m is about 667 times, and the vertical axis drilling rig needs to turn the rod cumulatively (calculated based on a stroke of 0.6 m) about 5000 times. Calculated based on 2 minutes for each rod turning, 167 hours of drilling time is consumed. In addition, each time the drilling rig turns the rod, it is necessary to perform the processes of shifting → stopping → turning the rod → starting → pressurizing → speed regulation, which can easily cause core fracture and core blockage, especially in relatively broken formations, which is more obvious, affecting the footage of each turn and the interval between rope coring drilling and drilling. According to the comparative analysis of drilling statistics, the impact of rod falling during drilling accounts for 10% to 30% of the footage per round (broken strata account for more than 30%), and the impact on the drilling interval accounts for about 10%. The core drilling rig mast of this embodiment has a long feeding stroke, which effectively solves the defects of the vertical axis drilling rig, such as short feeding stroke, long auxiliary time for parking and rod falling, high accident rate in the hole and low comprehensive efficiency, which is conducive to improving drilling efficiency, reducing auxiliary time and in-hole accidents such as core blockage.

[0047] The core drill mast of this embodiment adopts a three-section telescopic structure of upper, middle and lower sections. It is easy to move and transport, has good integrity, and the telescopic mast is easy and convenient, and can drill 45-90° inclined holes. The core drill mast of this embodiment has a simple structure, reasonable design, long service life, and can be raised and lowered efficiently and quickly.

[0048] The present specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A core drilling rig mast, characterized in that: The mast comprises an outer mast tube, a middle mast tube, an inner mast tube, a first pulley, a second pulley, a chain rope 1, a chain rope 2, a driving device, a first delay pin and a second delay pin, the middle mast tube is nested in the outer mast tube, the inner mast tube is nested in the middle mast tube, the first pulley is arranged on the outside of the outer mast tube, the second pulley is arranged on the outside of the middle mast tube, one end of the chain rope 1 is connected to the bottom of the middle mast tube, the chain rope 1 passes through the first pulley, the other end of the chain rope 1 is connected to the driving device, and one end of the chain rope 2 is connected to the The first delay pin and the second delay pin are connected to the bottom of the mast inner tube, the second chain rope passes through the second pulley, and the other end of the second chain rope is connected to the top of the mast outer tube, the first delay pin is set on the mast outer tube, and the second delay pin is set on the mast middle tube; after the driving device drives the mast inner tube and the mast middle tube to extend to the position, the first delay pin and the second delay pin are extended to achieve locking; when the first delay pin and the second delay pin are retracted, the mast inner tube is retracted into the mast middle tube, and the mast middle tube is retracted into the mast outer tube; The first delay pin and the second delay pin have the same structure. Both the first delay pin and the second delay pin include a top pin, an outer cylinder, a piston three, a main spring and a knob. The top pin, the piston three and the main spring are all arranged in the outer cylinder. The top pin and the piston three are respectively sealed and slidably connected to the outer cylinder. One end of the top pin can be extended from one end of the outer cylinder and is used to contact the mast middle tube or the mast inner tube. The space formed by the other end of the top pin, the inner wall of the outer cylinder and one end of the piston three is filled with hydraulic oil. One end of the main spring is abutted against the other end of the piston three, and the other end of the main spring is abutted against the knob arranged at the other end of the outer cylinder.

2. The core drilling rig mast according to claim 1, characterized in that: The first delay pin and the second delay pin also include a piston 1, a piston 2, a spring and a ball. The piston 1, the piston 2, the ball and the spring are all arranged in the outer cylinder. The piston 1, the piston 2, the ball and the spring are all located between the top pin and the piston 3. The piston 1 and the piston 2 are respectively fixed to the outer cylinder. A first space is formed between the pin and the piston 1, a second space is formed between the piston 1 and the piston 2, and a third space is formed between the piston 2 and the piston 3. The piston 1 is provided with a first through hole and a plurality of The piston is provided with a second through hole, and the piston is provided with a third through hole. One end of the first through hole and one end of the second through hole are both connected to the first space, the other end of the first through hole, the other end of the second through hole and one end of the third through hole are all connected to the second space, and the other end of the third through hole is connected to the third space. The ball and the spring are located between the piston one and the piston two, one end of the spring is connected to the ball, and the other end of the spring is connected to one end of the piston two. Under the action of the spring, the ball can close the other end of the first through hole.

3. The core drilling rig mast according to claim 1, characterized in that: The outer wall of the bottom of the mast inner tube is provided with an inner tube slide support, and the inner tube slide support is provided with an inner tube circular arc groove and a first inclined surface. The inner tube circular arc groove is connected to the upper end of the first inclined surface, and the upper end of the first inclined surface is inclined inward.

4. The core drilling rig mast according to claim 3, characterized in that: A limiting block is arranged on the outer wall of the inner tube of the mast, and the limiting block is at the same height as the arc groove of the inner tube.

5. The core drilling rig mast according to claim 1, characterized in that: The outer wall of the bottom of the mast middle tube is provided with a middle tube slide plate support, and the middle tube slide plate support is provided with a middle tube circular arc groove and a second inclined surface, the middle tube circular arc groove is connected to the upper end of the second inclined surface, and the upper end of the second inclined surface is inclined inward.

6. The core drilling rig mast according to claim 1, characterized in that: An outer tube limiter is provided at the upper end of the outer tube of the mast, and a middle tube limiter is provided at the upper end of the middle tube of the mast. The outer tube limiter and the middle tube limiter have the same structure. Both the outer tube limiter and the middle tube limiter include a limiter body, two first limiter plates and two second limiter plates. The first inner wall, the second inner wall, the third inner wall and the fourth inner wall of the limiter body are arranged in sequence, the first inner wall and the third inner wall are arranged opposite to each other, the second inner wall and the fourth inner wall are arranged opposite to each other, the two first limiter plates are symmetrically arranged on the first inner wall and the third inner wall of the limiter body, the two second limiter plates are arranged on the second inner wall of the limiter body, and the two second limiter plates are located on both sides of the first pulley or the second pulley.

7. The core drilling rig mast according to claim 1, characterized in that: The first pulley and the second pulley are respectively located on both sides of the mast inner tube.

8. The core drilling rig mast according to claim 1, characterized in that: The chain rope 1 passes through the first notch on the side wall of the mast outer tube, and one end of the chain rope 1 is connected to the lower part of the mast middle tube; The second chain rope passes through the second notch on the side wall of the mast middle tube, one end of the second chain rope is connected to the lower part of the mast inner tube, and the other end of the second chain rope is connected to the upper part of the mast outer tube.

9. The core drilling rig mast according to claim 1, characterized in that: There are two first delay pins and two second delay pins respectively. The two first delay pins are symmetrically arranged on the outer tube of the mast, and the two second delay pins are symmetrically arranged on the middle tube of the mast.

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