A drilling rig power block lifting mechanism

Abstract

The utility model provides a kind of drilling rig power head lifting mechanism, belong to engineering equipment field.It solves the problem of poor stability of existing lifting mechanism.The drilling rig power head lifting mechanism includes support and the drag board for installing power head being arranged in the front side of support, hydraulic cylinder for driving drag board lifting is equipped on support, left and right sides of hydraulic cylinder are vertically equipped with guide rod respectively, guide rod is fixed on support, guide sleeve is all set on two guide rods, two guide sleeves are all fixedly connected drag board, guide sleeve inner diameter is greater than guide rod outer diameter, copper sleeve and annular sealing element are installed in two ends of guide sleeve;In the same guide sleeve, two copper sleeves are between two sealing elements;The shape and size of copper sleeve inner hole are matched with guide rod, and copper sleeve is sleeved on corresponding guide rod;The inner and outer two sidewalls of sealing element are respectively in contact with corresponding guide rod outer wall and corresponding guide sleeve inner wall sealing.The drilling rig power head lifting mechanism is good in stability.

Description

Technical Field

[0001] This utility model belongs to the field of engineering equipment and relates to a drilling rig, and more particularly to a drilling rig power head lifting mechanism. Background Technology

[0002] A drilling rig is a mechanical device used in exploration or mineral resource development to drive drilling tools into the ground to obtain physical geological data.

[0003] Existing drilling rig structures, such as the fully hydraulic power head drilling rig disclosed in the Chinese Patent Database (application number: 202210653498.6) suitable for drilling loose and fractured formations, include a base frame assembly, a centering clamp, a pipe rolling machine, a power head assembly, a drilling rig guide rail, a fixed pulley block, a support cylinder, and a feed cylinder. The power head of the power head assembly is fixedly connected to the feed cylinder and slidably connected to the drilling rig guide rail. The power head assembly consists of a power head, a hexagonal guide rail sliding sleeve, and a power head support plate assembly. A hydraulic clamping and hydraulic vibration impact device is installed inside the power head of the power head assembly. A hexagonal guide rail sliding sleeve is welded to the outer shell of the power head support plate assembly. The power head support plate assembly is hinged to the power head. The power head support plate assembly is fixedly connected to the feed cylinder by screws.

[0004] In the aforementioned drilling rig, the power head slide plate forms a sliding connection with the base frame through the cooperation of the hexagonal guide rail sliding sleeve and the drilling rig guide rail. In order to improve the sliding fit accuracy, the gap between the hexagonal guide rail sliding sleeve and the drilling rig guide rail is set to be extremely small. Since drilling rigs are generally used in dirty and messy working conditions, mud and dirt often adhere to the guide rail. If the mud and dirt enter the aforementioned gap and accumulate, it will seriously hinder the lifting and lowering of the slide plate and affect the use of the drilling rig. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a drilling rig power head lifting mechanism that is stable in operation and has a long service life.

[0006] The objective of this utility model can be achieved through the following technical solution: A drilling rig power head lifting mechanism includes a bracket and a slide plate disposed on the front side of the bracket for mounting the power head. A hydraulic cylinder for driving the slide plate to lift is provided on the bracket. Guide rods are vertically provided on the left and right sides of the hydraulic cylinder. The guide rods are fixed on the bracket. Guide sleeves are fitted on both guide rods. Both guide sleeves are fixedly connected to the slide plate. The characteristic is that the inner diameter of the guide sleeve is larger than the outer diameter of the guide rod, and copper sleeves and annular sealing elements are installed in both ends of the guide sleeve. In the same guide sleeve, the two copper sleeves are located between the two sealing elements. The shape and size of the inner hole of the copper sleeve are matched with the guide rod, and the copper sleeve is fitted onto the corresponding guide rod. The inner and outer side walls of the sealing elements are in contact and sealed with the outer wall of the corresponding guide rod and the inner wall of the corresponding guide sleeve, respectively.

[0007] Both ends of the guide sleeve are sealed with the corresponding guide rod through the sealing element to block external dust and other impurities outside the sealing element, so that the copper sleeve can slide in a relatively closed and clean environment. This not only ensures that the copper sleeve slides smoothly and the power head lifting process is stable, but also reduces the wear of the copper sleeve and extends its service life.

[0008] In the aforementioned drilling rig power head lifting mechanism, the type of seal is a dustproof oil seal, which is used to better block dust and other impurities from the outside.

[0009] In the aforementioned drilling rig power head lifting mechanism, the guide sleeve is sealed to the outer wall of the guide rod via leak-proof oil seals at both ends, forming an annular oil cavity between the guide sleeve, guide rod, and two leak-proof oil seals. The annular oil cavity is located between corresponding seals, and both copper sleeves within the same guide sleeve are situated within their respective annular oil cavities. An oil inlet hole is provided on the side wall of the guide sleeve to connect the corresponding annular oil cavity to the outside, and a control device is installed at the oil inlet hole to control the connection between the oil inlet hole and the outside. During use, lubricating oil is introduced into the annular oil cavity through the oil inlet hole. This lubricating oil not only fills the gap between the guide rod and guide sleeve but also penetrates between the copper sleeve and guide rod, thus making the lifting and sliding of the guide sleeve smoother and further extending the life of the copper sleeve.

[0010] In the aforementioned drilling rig power head lifting mechanism, an interference fit is formed between the outer wall of the copper sleeve and the inner wall of the corresponding guide sleeve. Within the same guide sleeve, two copper sleeves divide the annular oil chamber into an upper chamber, a middle chamber, and a lower chamber. Vertical slots are vertically threaded through the inner walls of the guide sleeves at the two points where they contact the outer walls of the two copper sleeves. The aforementioned upper oil hole is directly opposite to and connects to the middle chamber. Both the upper and lower chambers are directly connected to the middle chamber via slots, allowing lubricating oil to quickly enter and fill the upper and lower chambers, further preventing dust from contacting the copper sleeves.

[0011] In the aforementioned drilling rig power head lifting mechanism, the guide sleeve sidewall is provided with a lower oil hole that connects the lower chamber to the outside, and the two lower oil holes are connected by a pipeline. In this way, as long as lubricating oil is poured into one oil chamber, the lubricating oil can enter the other oil chamber through the pipeline, which facilitates the lubricating oil filling.

[0012] In the aforementioned drilling rig power head lifting mechanism, the guide sleeve includes an intermediate sleeve and two end sleeves located at both ends of the intermediate sleeve. Within the same guide sleeve, adjacent ends of the end sleeves are inserted into the ends of the intermediate sleeve, and the end sleeves and intermediate sleeve are detachably and sealed together. Both of the aforementioned copper sleeves are housed within the intermediate sleeve, and dustproof oil seals and leak-proof oil seals are housed within their respective end sleeves. By disassembling the guide sleeve into detachably connected end sleeves and intermediate sleeves, and placing the easily damaged dustproof oil seals and leak-proof oil seals within the end sleeves, maintenance is facilitated.

[0013] In the aforementioned drilling rig power head lifting mechanism, both end sleeves of the same guide sleeve have protruding rings formed on their adjacent end faces. These protruding rings are fitted over the corresponding guide rods, and the distant ends of the two copper sleeves press against the two protruding rings respectively. This design allows the end sleeves to simultaneously serve as axial limiters for the copper sleeves, enabling the end caps to perform multiple functions simultaneously, thereby optimizing the structure and facilitating assembly.

[0014] In the aforementioned drilling rig power head lifting mechanism, the end sleeve and the corresponding intermediate sleeve are detachably connected by threads for easy disassembly and assembly.

[0015] In the aforementioned drilling rig power head lifting mechanism, the inner diameter of the end sleeve is larger than the outer diameter of the guide rod. An annular groove, coaxial with the end sleeve, is formed on the inner wall of the end sleeve. A ring-shaped guide band, matching the guide rod, is embedded within the annular groove. The guide band is made of a low-friction material and is sleeved onto the guide rod. The end sleeve contacts the guide rod via the guide band, significantly reducing friction and making the power head slide more smoothly.

[0016] In the aforementioned drilling rig power head lifting mechanism, an annular mounting groove is provided on the outer wall of the end sleeve, and a sealing ring is provided in the mounting groove. The sealing ring contacts and seals with the inner wall of the corresponding intermediate sleeve, so as to form a reliable seal between the end sleeve and the intermediate sleeve.

[0017] Compared with existing technologies, the power head lifting mechanism of this drilling rig has the following advantages: 1. Both ends of the guide sleeve are sealed with the corresponding guide rod through the sealing element to block external dust and other impurities outside the sealing element, so that the copper sleeve can slide in a relatively closed and clean environment. This not only ensures that the copper sleeve slides smoothly and the power head lifting process is stable, but also reduces the wear of the copper sleeve and extends its service life.

[0018] 2. Both the upper and lower cavities are directly connected to the middle cavity via strip grooves, allowing lubricating oil to quickly enter and fill the upper and lower cavities, further preventing dust from contacting the copper sleeve.

[0019] 3. The guide sleeve is disassembled into a detachable and fixed end sleeve and an intermediate sleeve, and the easily damaged dustproof oil seal and leak-proof oil seal are placed inside the end sleeve for easy maintenance. Attached Figure Description

[0020] Figure 1 This is a three-dimensional schematic diagram of the lifting mechanism of the power head of this drilling rig.

[0021] Figure 2 This is a three-dimensional schematic diagram of the power head lifting mechanism of this drilling rig in another direction.

[0022] Figure 3 This is a cross-sectional schematic diagram of the power head lifting mechanism of this drilling rig.

[0023] Figure 4 yes Figure 3Enlarged diagram of point A in the middle.

[0024] Figure 5 This is a three-dimensional schematic diagram of the middle layer.

[0025] Figure 6 This is a sectional view of the intermediate sleeve.

[0026] In the diagram, 1. Bracket; 1a. Strip raceway; 2. Power head; 3. Cargo plate; 4. Hydraulic cylinder; 4a. Cylinder barrel; 5. Connecting seat; 6. Roller; 7. Guide rod; 8. Guide sleeve; 8a. Upper oil hole; 8b. Strip groove; 8c. Lower oil hole; 8d. Intermediate sleeve; 8e. End sleeve; 8f. Convex ring; 9. Copper sleeve; 10. Seal; 11. Leak-proof oil seal; 12. Annular oil chamber; 12a. Upper chamber; 12b. Middle chamber; 12c. Lower chamber; 13. Control component; 14. Pipeline; 15. Sealing ring; 16. Guide belt. Detailed Implementation

[0027] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0028] Example 1: As Figure 1 As shown, the power head lifting mechanism of this drilling rig includes a bracket 1 and a slide plate 3 located on the front side of the bracket 1 for mounting the power head 2.

[0029] Among them, such as Figure 1 and Figure 2 As shown, the support 1 is equipped with a hydraulic cylinder 4 for driving the slide plate 3 to rise and fall. Specifically, the hydraulic cylinder 4 is vertically arranged and located behind the slide plate 3. The hydraulic cylinder 4 includes a cylinder barrel 4a and a piston rod vertically arranged inside the cylinder barrel 4a, with the lower end of the piston rod extending out of the cylinder barrel 4a and fixedly connected to the support 1. The cylinder barrel 4a is fixedly connected to the slide plate 3 through a connecting seat 5, so that the slide plate 3 can be driven to rise and fall by sliding the cylinder barrel 4a. Further, at least one roller 6 is rotatably mounted on both the left and right sides of the connecting seat 5, and the axis of the roller 6 extends to the left and right. A strip-shaped raceway 1a is vertically formed on the support 1, and the cross-section of the strip-shaped raceway 1a is U-shaped, matching the roller 6. There are two strip-shaped raceways 1a, which are respectively arranged on the left and right sides of the connecting seat 5. The roller 6 is rolled in the corresponding strip-shaped raceway 1a to improve the sliding support of the cylinder barrel 4a. In the actual product, each strip raceway 1a is provided with at least two rollers 6, and multiple rollers 6 in the same strip raceway 1a are vertically distributed.

[0030] Guide rods 7 are vertically installed on the left and right sides of the hydraulic cylinder 4, with the two guide rods 7 arranged side by side, and the two shaped raceways 1a are located between the two guide rods 7. The guide rods 7 are fixed on the bracket 1, and guide sleeves 8 are fitted on both guide rods 7. Both guide sleeves 8 are fixed to the slide plate 3 to provide better support for the lifting and sliding of the slide plate 3.

[0031] like Figure 3 and Figure 4 As shown, the guide sleeve 8 and the corresponding guide rod 7 are coaxially arranged. The inner diameter of the guide sleeve 8 is larger than the outer diameter of the guide rod 7, and copper sleeves 9 and annular sealing elements 10 are installed at both ends of the guide sleeve 8. In the same guide sleeve 8, the two copper sleeves 9 are located between the two sealing elements 10; the shape and size of the inner hole of the copper sleeve 9 are matched with the guide rod 7, and the copper sleeve 9 is sleeved on the corresponding guide rod 7; the inner and outer side walls of the sealing element 10 respectively contact and seal with the outer wall of the corresponding guide rod 7 and the inner wall of the corresponding guide sleeve 8.

[0032] Both ends of the guide sleeve 8 are sealed with the corresponding guide rod 7 through the sealing element 10 to block external dust and other impurities outside the sealing element 10, so that the copper sleeve 9 slides in a relatively closed and clean environment. This not only ensures that the copper sleeve 9 slides smoothly and the lifting process of the power head 2 is stable, but also reduces the wear of the copper sleeve 9 and extends its service life.

[0033] The preferred type of seal 10 is a dustproof oil seal to better prevent dust and other impurities from entering. Dustproof oil seals are existing products and are available on the market. The installation method of the dustproof oil seal is as follows: A ring-shaped positioning groove is formed on the inner wall of the guide sleeve 8, and the positioning groove is coaxially arranged with the corresponding guide sleeve 8. There are two positioning grooves, the shape and size of which match the dustproof oil seal. The two dustproof oil seals are respectively inserted into the two positioning grooves, and the outer wall of the dustproof oil seal presses against the inner wall of the corresponding positioning groove.

[0034] like Figures 3 to 5 As shown, the guide sleeve 8 is also sealed to the outer wall of the guide rod 7 through the anti-leakage oil seal 11 at both ends. At this time, the anti-leakage oil seal 11 is sleeved on the corresponding guide rod 7, and the inner and outer walls of the anti-leakage oil seal 11 are in contact with the outer wall of the corresponding guide rod 7 and the inner wall of the corresponding guide sleeve 8, respectively. The guide sleeve 8, the guide rod 7 and the two anti-leakage oil seals 11 form an annular oil cavity 12, and the annular oil cavity 12 is coaxially arranged with the corresponding guide sleeve 8. At this time, the annular oil cavity 12 is located between the two corresponding sealing elements 10, and the two copper sleeves 9 in the same guide sleeve 8 are both located in the corresponding annular oil cavity 12. The side wall of the guide sleeve 8 is provided with an upper oil hole 8a to connect the corresponding annular oil cavity 12 to the outside, and a control element 13 for controlling the connection and disconnection between the upper oil hole 8a and the outside is installed at the upper oil hole 8a. In use, lubricating oil is fed into the annular oil cavity 12 through the oil inlet 8a. The lubricating oil not only fills the gap between the guide rod 7 and the guide sleeve 8, but also seeps into the space between the copper sleeve 9 and the guide rod 7. This not only makes the sliding of the guide sleeve 8 smoother, but also further extends the life of the copper sleeve 9.

[0035] To further explain, such as Figures 3 to 6As shown, an interference fit is formed between the outer wall of the copper sleeve 9 and the inner wall of the corresponding guide sleeve 8. In the same guide sleeve 8, the two copper sleeves 9 divide the annular oil cavity 12 into an upper cavity 12a, a middle cavity 12b, and a lower cavity 12c. Vertical slots 8b are vertically inserted on the inner walls of the guide sleeves 8 at the two points where they contact the outer walls of the two copper sleeves 9. The aforementioned upper oil hole 8a is directly opposite to and connects to the middle cavity 12b. The upper cavity 12a and the lower cavity 12c are directly connected to the middle cavity 12b by the corresponding slots 8b, allowing lubricating oil to quickly enter and fill the upper cavity 12a and the lower cavity 12c, further preventing dust from contacting the copper sleeve 9.

[0036] like Figure 2 and Figure 4 As shown, the guide sleeve 8 has an oil hole 8c on its side wall that connects the lower cavity 12c to the outside, and the two oil holes 8c are connected by a pipe 14. In this way, as long as lubricating oil is poured into one oil cavity, the lubricating oil can enter the other oil cavity through the pipe 14, which facilitates the addition of lubricating oil.

[0037] In this embodiment, The leak-proof oil seal 11 is an existing product and can be purchased on the market. The installation method of the leak-proof oil seal 11 is as follows: A second annular positioning groove is formed on the inner wall of the guide sleeve 8, and the second positioning groove and the corresponding guide sleeve 8 are coaxially arranged. There are two second positioning grooves, the shape and size of which match the leak-proof oil seal 11. The two leak-proof oil seals 11 are respectively inserted into the two second positioning grooves, and the outer wall of the leak-proof oil seal 11 presses against the inner wall of the corresponding second positioning groove.

[0038] The lower oil holes 8c are strip-shaped and extend horizontally. One end of each lower oil hole 8c is connected to the two lower cavities 12c, and the other end of each lower oil hole 8c is located on the outer surface of the two guide sleeves 8. The pipeline 14 includes two connectors installed at the other end of each lower oil hole 8c, and the two connectors are connected by a connecting pipe.

[0039] like Figures 4 to 6 As shown, the guide sleeve 8 has a split structure, specifically as follows: The guide sleeve 8 includes an intermediate sleeve 8d and two end sleeves 8e located at both ends of the intermediate sleeve 8d, with both the intermediate sleeve 8d and the end sleeves 8e fitted over the guide rod 7. Within the same guide sleeve 8, adjacent ends of the end sleeves 8e are inserted into the ends of the intermediate sleeve 8d, and the end sleeves 8e and the intermediate sleeve 8d are detachably and sealed together. Two copper sleeves 9 are both located within the intermediate sleeve 8d, and dustproof oil seals and leak-proof oil seals 11 are both located within the corresponding end sleeves 8e. Upper oil holes 8a and lower oil holes 8c are located at the upper and lower ends of the intermediate sleeve 8d, respectively. By disassembling the guide sleeve 8 into detachably fixed end sleeves 8e and intermediate sleeve 8d, and placing the easily damaged dustproof oil seals and leak-proof oil seals 11 within the end sleeves 8e, maintenance is facilitated.

[0040] To further explain, in the same guide sleeve 8, protruding rings 8f are formed on the adjacent end faces of both end sleeves 8e, and the protruding rings 8f are sleeved on the corresponding guide rods 7. The far ends of the two copper sleeves 9 press against the two protruding rings 8f respectively. With the above design, the end sleeves 8e are used for axial positioning of the copper sleeves 9, and the end caps have multiple functions at the same time, so as to optimize the structure and facilitate assembly. Furthermore, annular steps matching the copper sleeves 9 are formed on the inner walls of both ends of the intermediate sleeve 8d. The copper sleeves 9 are embedded in the corresponding annular steps and pressed against the bottom wall of the annular steps, so as to further strengthen the connection strength between the copper sleeves 9 and the corresponding guide sleeves 8.

[0041] In the actual product, the end sleeve 8e and the corresponding intermediate sleeve 8d are detachably connected by threads for easy assembly and disassembly. Further, an annular mounting groove is provided on the outer wall of the end sleeve 8e, and a sealing ring 15 is provided within the mounting groove. The sealing ring 15 contacts and seals the inner wall of the corresponding intermediate sleeve 8d, thus forming a reliable seal between the end sleeve 8e and the intermediate sleeve 8d.

[0042] like Figure 3 As shown, the inner diameter of the end sleeve 8e is larger than the outer diameter of the guide rod 7. An annular groove, coaxial with the end sleeve 8e, is formed on the inner wall of the end sleeve 8e. A guide band 16, also annular and matching the guide rod 7, is embedded within the annular groove. The guide band 16 is made of a low-friction material and is sleeved onto the guide rod 7. The end sleeve 8e contacts the guide rod 7 via the guide band 16, significantly reducing friction and making the power head 2 slide more smoothly. The low-friction material can be filled with tetrafluoroethylene or phenolic resin-insulated fabric.

[0043] In this embodiment, one of the control components 13 is a switch valve, and the discharge end of the switch valve is connected to the corresponding oil inlet 8a; the other control component 13 is a threaded plug, and the threaded plug is threadedly connected to another oil inlet 8a. Setting one of the control components 13 as a switch valve facilitates the injection of lubricating oil into the oil chamber.

[0044] Example 2: The structure and principle of Example 2 are basically the same as those of Example 1. The difference is that both control components 13 are threaded plugs, and the two threaded plugs are threadedly connected to the two oil holes 8a respectively.

[0045] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A drilling rig power head lifting mechanism, comprising a bracket (1) and a slide plate (3) disposed on the front side of the bracket (1) for mounting a power head (2), wherein the bracket (1) is provided with a hydraulic cylinder (4) for driving the slide plate (3) to lift, and guide rods (7) are vertically provided on the left and right sides of the hydraulic cylinder (4), the guide rods (7) are fixed on the bracket (1), and guide sleeves (8) are sleeved on both guide rods (7), and both guide sleeves (8) are fixedly connected to the slide plate (3), characterized in that, The inner diameter of the guide sleeve (8) is larger than the outer diameter of the guide rod (7), and both ends of the guide sleeve (8) are equipped with copper sleeves (9) and annular sealing elements (10); in the same guide sleeve (8), the two copper sleeves (9) are located between the two sealing elements (10); the shape and size of the inner hole of the copper sleeve (9) are matched with the guide rod (7), and the copper sleeve (9) is sleeved on the corresponding guide rod (7); the inner and outer side walls of the sealing element (10) respectively contact and seal with the outer wall of the corresponding guide rod (7) and the inner wall of the corresponding guide sleeve (8).

2. The drilling rig power head lifting mechanism according to claim 1, characterized in that, The type of the aforementioned seal (10) is a dustproof oil seal.

3. The drilling rig power head lifting mechanism according to claim 1 or 2, characterized in that, The guide sleeve (8) is sealed to the outer wall of the guide rod (7) by the oil seal (11) at both ends, and an annular oil cavity (12) is formed between the guide sleeve (8), the guide rod (7) and the two oil seals (11); the annular oil cavity (12) is located between the two corresponding seals (10), and the two copper sleeves (9) in the same guide sleeve (8) are located in the corresponding annular oil cavity (12); the guide sleeve (8) has an oil hole (8a) on its side wall that connects the corresponding annular oil cavity (12) to the outside, and a control element (13) for controlling the connection between the oil hole (8a) and the outside is installed at the oil hole (8a).

4. The drilling rig power head lifting mechanism according to claim 3, characterized in that, An interference fit is formed between the outer wall of the copper sleeve (9) and the inner wall of the corresponding guide sleeve (8); in the same guide sleeve (8), the two copper sleeves (9) divide the annular oil cavity (12) into an upper cavity (12a), a middle cavity (12b) and a lower cavity (12c). The inner walls of the guide sleeve (8) that contact the outer walls of the two copper sleeves (9) are vertically perforated by strip grooves (8b). The above-mentioned upper oil hole (8a) is directly opposite to and connected to the middle cavity (12b).

5. The drilling rig power head lifting mechanism according to claim 4, characterized in that, The guide sleeve (8) has an oil hole (8c) on its side wall that connects the lower cavity (12c) to the outside, and the two oil holes (8c) are connected by a pipeline (14).

6. The drilling rig power head lifting mechanism according to claim 5, characterized in that, The guide sleeve (8) includes an intermediate sleeve (8d) and two end sleeves (8e) located at both ends of the intermediate sleeve (8d); in the same guide sleeve (8), the adjacent ends of the two end sleeves (8e) are inserted into the two ends of the intermediate sleeve (8d), and the end sleeves (8e) and the intermediate sleeve (8d) are detachably sealed and fixedly connected. Both of the above copper sleeves (9) are set in the intermediate sleeve (8d), and the dustproof oil seal and the leak-proof oil seal (11) are set in the corresponding end sleeves (8e).

7. The drilling rig power head lifting mechanism according to claim 6, characterized in that, In the same guide sleeve (8), the adjacent end faces of the two end sleeves (8e) are formed with convex rings (8f), and the convex rings (8f) are sleeved outside the corresponding guide rods (7), and the far ends of the two copper sleeves (9) press against the two convex rings (8f) respectively.

8. The drilling rig power head lifting mechanism according to claim 6, characterized in that, The end sleeve (8e) and the corresponding intermediate sleeve (8d) are detachably connected by threads.

9. The drilling rig power head lifting mechanism according to claim 8, characterized in that, The inner diameter of the end sleeve (8e) is larger than the outer diameter of the guide rod (7); an annular groove coaxial with the end sleeve (8e) is provided on the inner wall of the end sleeve (8e), and a guide strip (16) that is annular and matches the guide rod (7) is embedded in the annular groove. The guide strip (16) is made of low friction material and is sleeved on the guide rod (7).

10. The drilling rig power head lifting mechanism according to claim 8, characterized in that, An annular mounting groove is provided on the outer side wall of the end sleeve (8e), and a sealing ring (15) is provided in the mounting groove, and the sealing ring (15) contacts and seals with the inner wall of the corresponding intermediate sleeve (8d).

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