Sealed telescopic drill rod

Abstract

The utility model provides a sealing telescopic drill rod. Sealing between inserted rod pieces is achieved by improving the structure of the sealing telescopic drill rod. The sealing telescopic drill rod comprises a sealing sleeve, an outer rod and an inner rod, wherein the outer rod and the inner rod can relatively slide in the axial direction and are mutually nested; the sealing sleeve wraps the sleeving position of the outer rod and the inner rod; the sealing sleeve comprises a second pipe section, the inner side wall of the second pipe section abuts against the outer side wall of the inner rod in the radial direction, a containing groove is formed in the second pipe section, a sealing ring is arranged in the containing groove, and the sealing ring is elastically connected with the containing groove through a first elastic piece; under the working condition that the inner rod and the outer rod slide relatively, the sealing ring can retract in the radial direction; and under the working condition that the inner rod and the outer rod are relatively static, the sealing ring is driven by the first elastic piece to protrude outwards in the radial direction to abut against the outer side wall of the inner rod.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of drill pipe sealing, and specifically relates to a sealed telescopic drill pipe. BACKGROUND

[0002] Cement mixing pile foundation as a kind of efficient and widely used soft ground treatment technology plays an important role in civil engineering field.The technology is to dig pile hole first, and cement is sprayed into soil during the process of excavation, and soft soil and solidifying agent are forced to mix in situ by mechanical force.In actual construction process, the depth of pile hole often reaches dozens of meters, and the existing pile machine generally adopts telescopic drill pipe design with multiple sections.But the conventional telescopic drill pipe is prone to mud and water entering between adjacent rod members after entering mud, thereby affecting the normal telescoping of drill pipe. SUMMARY

[0003] The utility model aims at providing a sealed telescopic drill pipe, which realizes sealing between the rod members inserted into each other by improving the structure of the sealed telescopic drill pipe.

[0004] To achieve the above object, the utility model provides a sealed telescopic drill pipe, which comprises a sealing sleeve and an outer rod and an inner rod capable of sliding relative to each other along the axial direction, the sealing sleeve wraps the position where the outer rod and the inner rod are sleeved; the sealing sleeve comprises a second pipe section, the inner side wall of the second pipe section abuts against the outer side wall of the inner rod in the radial direction, the second pipe section is provided with a containing groove, and a sealing ring is arranged in the containing groove; the sealing ring and the containing groove are elastically connected by a first elastic member;

[0005] Under the working condition that the inner rod and the outer rod slide relative to each other, the sealing ring can retract in the radial direction; under the working condition that the inner rod and the outer rod are relatively static, the sealing ring is driven by the first elastic member to protrude outward in the radial direction to abut against the outer side wall of the inner rod.

[0006] By adopting the technical scheme of the utility model, when the rod members move relative to each other, the sealing ring can retract inward to avoid damaging the sealing ring during the movement of the rod members; under the condition that the rod members are relatively static, the sealing ring installed on the sealing sleeve of the rod members is in close contact with the outer circumferential surface of the rod members under the action of the first elastic member, and the gap between the rod members is fully filled; when the telescopic drill pipe is operated underground, clay or mud can be effectively prevented from penetrating into the gap between the rod members, thereby affecting the telescoping effect of the rod members, and even corroding the rod members.

[0007] Optionally, the sealing ring comprises an axially extending ring body, and an upward turned edge and a downward turned edge are correspondingly arranged at both ends of the ring body and extend radially outward; the upward turned edge and the downward turned edge are always located in the accommodating groove and axially abut against the groove side wall of the corresponding side, and can slide radially relative to the groove side wall of the corresponding side.

[0008] Thus, the ring body can seal the groove opening of the mounting groove, and while protecting the first elastic member, the mud water entering the mounting groove can be prevented from entering between the inner rod and the outer rod.

[0009] Optionally, part of the groove wall of the accommodating groove, the ring body, the lower wall surface of the upward turned edge and the upper wall surface of the downward turned edge form a closed accommodating cavity, and the first elastic member is arranged in the accommodating cavity. Thus, the first elastic member can be protected to avoid damage.

[0010] Optionally, the first elastic member is a ring-shaped elastic bag. By arranging the bag-shaped first elastic member, the first elastic member can be filled into the accommodating cavity to form further sealing inside the accommodating cavity.

[0011] Optionally, the sealing sleeve comprises a first pipe section, the second pipe section is arranged on the first pipe section, the first pipe section further comprises a first pipe section and a third pipe section, the inner side wall of the first pipe section is pressed against the outer side wall of the outer rod in the radial direction, and the third pipe section is located on the side of the second pipe section away from the first pipe section.

[0012] The sealing sleeve further comprises a second pipe section which abuts against the outer side wall of the inner rod in the radial direction, the third pipe section is sleeved on the second pipe section and detachably connected with the second pipe section, and a mud scraping part is further arranged between the second pipe section and the outer side wall of the inner rod.

[0013] By arranging the detachably connected second pipe section and the mud scraping part on the second pipe section, the maintenance and replacement of the mud scraping part can be facilitated.

[0014] Optionally, the second pipe section further comprises a liquid storage groove, and the liquid storage groove is located on the upper side of the mud scraping part. By arranging the liquid storage groove, the mud water from the mud scraping part can be collected.

[0015] Optionally, the third pipe section is provided with a liquid outlet flow channel and a liquid inlet flow channel which communicate with the liquid storage groove and the outside, and the liquid inlet flow channel and the liquid outlet flow channel can be switched between the open state and the closed state. By arranging the liquid outlet flow channel, the mud water in the liquid storage groove can be drained outward, and by arranging the liquid inlet flow channel, liquid can be injected into the liquid storage groove, so that the dry mud blocks in the mud scraping part can be dissolved and discharged.

[0016] Optionally, at least part of the upper end surface of the second pipe section constitutes a groove side wall of the accommodating groove and abuts against the lower wall surface of the downward turned edge in the axial direction. Thus, the installation, maintenance and replacement of the first elastic member and the sealing ring can be facilitated.

[0017] Optionally, the mud scraping portion is elastic; or, a second elastic member is arranged between the mud scraping portion and the second pipe section, the second elastic member being at least one of a spring and rubber, or a combination of both. Thus, when the inner rod and the outer rod move relative to each other, the mud scraping plate is retracted to avoid interference, and when the inner rod and the outer rod are relatively stationary, the mud scraping plate is pressed radially against the inner rod.

[0018] Optionally, the mud scraping portion extends spirally around the inner rod; or, a plurality of closed annular mud scraping portions are arranged vertically spaced apart on the second pipe section. Thus, the mud scraping effect on the inner rod can be further improved.

[0019] Optionally, the first pipe section is detachably mounted on the outer rod by a fastener; and / or, a structural adhesive is arranged between the first pipe section and the outer side wall of the outer rod. Thus, the sealed connection of the first pipe section and the outer rod can be achieved.

[0020] Optionally, the sealing ring comprises a plurality of arc-shaped sections, each of which is arranged around the inner rod and sequentially inserted at the tail end of the previous one; and the surface defining the joint between two adjacent arc-shaped sections is arranged at a certain angle relative to the central axis of the inner rod. Thus, the installation, maintenance and replacement of the sealing ring can be facilitated.

[0021] Other features of the present specification, and the advantages thereof over existing prior art of the same or similar nature, will become apparent upon consideration of the following detailed description of exemplary embodiments thereof, with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present specification and, together with the description, serve to explain the principles of the present specification.

[0023] Figure 1 is a schematic view of a three-dimensional structure of a sealed telescopic drill rod;

[0024] Figure 2 is a sectional view of a sealed telescopic drill rod; Figure 1 is an enlarged view of part A in the middle;

[0025] Figure 3 is a sectional view of a sealed telescopic drill rod;

[0026] Figure 4 is a sectional view of a sealed telescopic drill rod; Figure 3 is an enlarged view of part B in the middle;

[0027] Figure 5 is a sectional view of a sealed telescopic drill rod;

[0028] Figure 6 For Figure 5 A local enlarged view at C;

[0029] Figure 7 A perspective view of a sealing ring;

[0030] Figure 8 For Figure 7 A local enlarged view at D;

[0031] Figure 9 A perspective view of a sealing sleeve;

[0032] Figure 10 A perspective view of a mud scraping part;

[0033] Figure 11 A perspective view of a mud scraping part.

[0034] Reference signs:

[0035] 1a-outer rod; 1b-inner rod; 12-upper limit part; 2-sealing sleeve; 21-first hexagonal bolt; 22-second hexagonal bolt; 23-second pipe part; 27-first pipe part; 24-first pipe section; 25-second pipe section; 26-third pipe section; 28-receiving groove; 31-sealing ring; 31a-ring body; 31b-upper flange; 31c-lower flange; 311-elastic piece embedding groove; 312-splicing joint; 312a-first splicing surface; 312b-second splicing surface; 32-first elastic piece; 4-mud scraping part; 5-liquid storage groove; 51-plugging piece. DETAILED DESCRIPTION

[0036] The utility model provides a kind of sealing telescopic drill rod, the sealing of the structure of sealing telescopic drill rod is improved to realize the sealing between the rod piece of mutual insertion.

[0037] In order to make the personnel in this technical field better understand the utility model scheme, the utility model is further explained in detail below in conjunction with the drawings and specific embodiments.

[0038] The relational terms such as "first" and "second" are only used to distinguish one from another of the same name, and do not necessarily require or imply any such actual relationship or order between the parts.

[0039] Please refer to Figures 1-11 , Figure 1 A perspective view of a sealing telescopic drill rod; Figure 2 For Figure 1 A local enlarged view at A; Figure 3 A sectional view of a sealing telescopic drill rod;Figure 4 For Figure 3 The local enlarged view at B; Figure 5 For another sectional view of the sealing telescopic drill rod; Figure 6 For Figure 5 The local enlarged view at C; Figure 7 For the perspective structural schematic view of the sealing ring; Figure 8 For Figure 7 The local enlarged view at D; Figure 9 For the perspective structural schematic view of the sealing sleeve; Figure 10 For the perspective structural schematic view of the mud scraping part; Figure 11 For the perspective structural schematic view of the mud scraping part.

[0040] As shown in the drawings, the utility model provides a kind of sealing telescopic drill rod, which includes sealing sleeve 2 and outer rod 1a and inner rod 1b can be relatively slid along the axial and mutually nested.The outer rod 1a and inner rod 1b of the utility implementation are not rotating themselves, can be hollow rod body or cylinder, or tube body, and its cross-sectional shape is not limited.

[0041] Sealing sleeve 2 wraps the position of outer rod 1a and inner rod 1b. Sealing sleeve 2 includes first tube part 27, and first tube part 27 includes axially arranged first tube segment 24 and second tube segment 25, and second tube segment 25 is arranged on first tube part 27, and the inner side wall of first tube segment 24 is pressed against the outer side wall of outer rod 1a. First tube segment 24 is detachably mounted on outer rod 1a by fastener; and / or, structural adhesive is arranged between first tube segment 24 and the outer side wall of outer rod 1a. Thus, the sealed connection of first tube segment 24 and outer rod 1a can be realized.

[0042] The inner side wall of second tube segment 25 is tightly pressed against the outer side wall of inner rod 1b. The radial dimension of second tube segment 25 is smaller than the radial dimension of first tube segment 24. Second tube segment 25 is provided with accommodating groove 28, which is outwardly concave along the radial direction by the inner side wall of second tube segment 25. Sealing ring 31 is arranged in accommodating groove 28, and sealing ring 31 is elastically connected with accommodating groove 28 by first elastic member 32. First elastic member 32 can be selected from spring, rubber or other elastic structures, for example, first elastic member 32 is annular elastic capsule.

[0043] Under the working condition that inner rod 1b and outer rod 1a are relatively slid, first elastic member 32 is extruded, and sealing ring 31 can be radially retracted; under the working condition that inner rod 1b and outer rod 1a are relatively stationary, sealing ring 31 is driven by first elastic member 32 to radially protrude to tightly press against the outer side wall of inner rod 1b.

[0044] By adopting the technical scheme of the present application, the sealing ring 31 can be retracted when the rods are relatively moved, so as to avoid damage to the sealing ring 31 during the movement of the rods. When the rods are in a relatively static state, the sealing ring 31 installed on the rod sealing sleeve 2 is in close contact with the outer circumferential surface of the rods under the action of the first elastic member 32, and the gap between the rods is fully filled. When the telescopic drill rod is working underground, the clay or mud can be effectively prevented from seeping into the gap between the rods to affect the telescopic effect of the rods, or even corrode the rods.

[0045] In some optional examples, the sealing ring 31 includes an axially extending ring body 31a, and an upward turned edge 31b and a downward turned edge 31c are correspondingly arranged at both ends of the ring body 31a and extend radially outward. The ring body 31a and the upward turned edge 31b and the downward turned edge 31c are integrally formed. The upward turned edge 31b and the downward turned edge 31c are always located in the accommodating groove 28 and axially abut against the groove side wall of the corresponding side of the accommodating groove 28, and can slide radially relative to the groove side wall of the corresponding side.

[0046] Thus, the ring body 31a can be used to seal the slot of the installation groove, and at the same time, the first elastic member 32 is protected, and the mud water is prevented from entering the installation groove and then entering between the inner rod 1b and the outer rod 1a.

[0047] In the example shown in the figure, part of the groove wall of the accommodating groove 28, the ring body 31a, the lower wall surface of the upward turned edge 31b and the upper wall surface of the downward turned edge 31c form a closed accommodating cavity, and the first elastic member 32 is arranged in the accommodating cavity. Thus, the first elastic member 32 can be protected to avoid damage to the first elastic member 32. In addition, by arranging the first elastic member 32 in the form of a capsule, the first elastic member 32 can be filled into the accommodating cavity, so as to form further sealing inside the accommodating cavity.

[0048] In the foregoing embodiments, the sealing ring 31 includes a plurality of arc segments, each of which is arranged around the inner rod 1b and sequentially connected at the tail end. The surface connecting the two adjacent arc segments is arranged at a certain angle relative to the central axis of the inner rod 1b. Thus, the installation, maintenance and replacement of the sealing ring 31 can be facilitated.

[0049] In some other embodiments of the present application, the first pipe section 27 further includes a third pipe section 26 located on the side of the second pipe section 25 away from the first pipe section 24. The sealing sleeve 2 further includes a second pipe section 23 radially abutting against the outer side wall of the inner rod 1b, the third pipe section 26 is sleeved on the second pipe section 23 and detachably connected with the second pipe section 23, and a mud scraping portion 4 is further arranged between the second pipe section 23 and the outer side wall of the inner rod.

[0050] By setting the second pipe section 23 in detachable connection, and setting the mud scraping section 4 on the second pipe section 23, the maintenance and replacement of the mud scraping section 4 can be facilitated.

[0051] In one specific example, the mud scraping section 4 is elastic. Alternatively, a second elastic member is set between the mud scraping section 4 and the second pipe section 23, the second elastic member being at least one of a spring and rubber, or a combination of both. In this way, when the inner rod 1b and the outer rod 1a move relative to each other, the mud scraping plate retracts to avoid interference, and when the inner rod 1b and the outer rod 1a are relatively stationary, the mud scraping plate is pressed radially against the inner rod 1b.

[0052] In another specific example, the mud scraping section 4 extends in a spiral around the inner rod 1b. Alternatively, multiple closed-loop mud scraping sections 4 are vertically spaced apart on the second pipe section 23. In this way, the mud scraping effect on the inner rod 1b can be further improved.

[0053] In the present embodiment, the second pipe section 23 is also provided with a liquid storage groove 5, which is formed by the inner side wall of the second pipe section 23 being recessed radially outward, and the liquid storage groove 5 is located above the mud scraping section 4. By providing the liquid storage groove 5, the mud and water from the mud scraping section 4 can be collected.

[0054] As an optional embodiment, the third pipe section 26 is provided with a liquid outlet channel and a liquid inlet channel that communicate with the liquid storage groove 5 and the outside, and the liquid inlet channel and the liquid outlet channel can be switched between open and closed states. By providing the liquid outlet channel, the mud and water in the liquid storage groove 5 can be drained outward, and by providing the liquid inlet channel, liquid can be injected into the liquid storage groove 5, thereby facilitating the dissolution and export of dry mud blocks in the mud scraping groove.

[0055] In other embodiments, at least part of the upper end surface of the second pipe section 23 constitutes the groove side wall of the containing groove 28, and abuts the lower wall surface of the downward turned edge 31c in the axial direction. In this way, the installation, maintenance and replacement of the first elastic member 32 and the sealing ring 31 can be facilitated.

[0056] The technical solutions of the present application will be further explained below through three more detailed specific examples. It should be noted that these three examples are only used for illustration and are not intended to limit the scope of the technical solutions of the present application. Those skilled in the art can certainly combine the following three examples with the previous examples partially or entirely, and all the technical solutions derived from such combinations fall within the scope of protection of the present patent.

[0057] Example One

[0058] As Figures 1-4As shown, a sealing telescopic drill rod comprises an axially slidingly sleeved outer rod 1a and inner rod 1b, a sealing sleeve 2 mounted on the end of the outer rod 1a, and a sealing assembly built in the sealing sleeve 2 and radially abutting against the inner rod 1b; wherein the sealing assembly comprises a sealing ring 31 and a first elastic member 32 radially pushing the sealing ring 31 towards the inner rod 1b, and the sealing ring 31 is provided with an elastic member embedding groove 311 opposite to the inner rod 1b, i.e. the elastic member embedding groove 311 is jointly formed by the ring body 31a, the upper turning edge 31b and the lower turning edge 31c.

[0059] Specifically, when the telescopic drill rod is working underground, the sealing ring 31 mounted on the sealing sleeve 2 of the outer rod 1a is in close contact with the outer circumferential surface of the inner rod 1b under the action of the first elastic member 32, and the gap between the outer rod 1a and the inner rod 1b is fully filled, so as to avoid clay or mud from seeping into the gap between the outer rod 1a and the inner rod 1b, affecting the telescopic effect of the outer rod 1a and the inner rod 1b, or even corroding the outer rod 1a and the inner rod 1b. The sealing ring 31 is provided with the elastic member embedding groove 311 for embedding the first elastic member 32, so as to avoid the first elastic member 32 from being damaged by contacting the outer circumferential surface of the inner rod 1b, or affecting the stable radial pushing force of the first elastic member 32 to the sealing ring 31, thereby affecting the sealing effect of the sealing ring 31.

[0060] In detail, the material of the sealing ring 31 is metal or other materials with smooth surface, low abrasion and certain elastic deformation capacity, and more preferably, the sealing ring 31 is a copper sleeve. By using the sealing ring 31 to abut against the outer circumferential surface of the inner rod 1b to ensure the sealing effect without directly contacting the first elastic member 32 with the inner rod 1b, the first elastic member 32 can be effectively avoided from being affected when the outer rod 1a and the inner rod 1b slide relative to each other.

[0061] Preferably, the outer rod 1a and the inner rod 1b have an upper limiting part 12, and when the outer rod 1a and the inner rod 1b are elongated, the upper limiting part 12 of the inner rod 1b abuts against the sealing sleeve 2 of the outer rod 1a, so as to avoid the outer rod 1a and the inner rod 1b from completely separating.

[0062] Further, the first elastic member 32 is a ring-shaped elastic bag, and the first elastic member 32 is a ring-shaped elastic bag filled with a medium, and after the medium is filled, the ring-shaped elastic bag is expanded, and when the ring-shaped elastic bag extrudes the sealing ring 31, the sealing ring 31 can be uniformly extruded, so that the sealing ring 31 is tightly attached to the outer circumferential surface of the inner rod 1b. Preferably, the first elastic member 32 is a ring-shaped elastic bag. The elastic member embedding groove 311 is a rectangular groove to facilitate the processing and forming of the sealing ring 31, thereby reducing the production cost. The axial section of the first elastic member 32 along the outer rod 1a and / or the inner rod 1b is rectangular to match the elastic member embedding groove 311, so that the first elastic member 32 can better push the sealing ring 31. Of course, it can also be other shapes, and preferably the axial section of the first elastic member 32 is rectangular, which can avoid the displacement of the sealing ring 31 relative to the first elastic member 32 due to the friction between the inner rod 1b and the sealing ring 31 when the outer rod 1a and the inner rod 1b move relatively in the axial direction, and the first elastic member 32 can also uniformly provide a radial pushing force.

[0063] As shown in Figure 7 , 8 Further, the sealing ring 31 includes at least two arc-shaped segments surrounding the inner rod 1b in the circumferential direction, one of the arc-shaped segments between the adjacent two arc-shaped segments has a first splicing surface 312a, and the other arc-shaped segment has a second splicing surface 312b, and the first splicing surface 312a and the second splicing surface 312b form a splicing joint 312 therebetween. The sealing ring 31 is provided as a split arc-shaped segment, which facilitates the installation of the sealing ring 31 on the sealing sleeve 2. The first splicing surface 312a and the second splicing surface 312b of the adjacent two arc-shaped segments are parallel to each other, and the first splicing surface 312a and / or the second splicing surface 312b are obliquely arranged to avoid the existence of a gap along the axial direction of the sealing ring 31, thereby improving the sealing effect of the split sealing ring 31. The oblique direction can be the oblique direction in the circumferential direction of the sealing ring 31, or the oblique direction can be the oblique direction of the inner side and the outer side of the sealing ring 31, and preferably the oblique direction is in the circumferential direction and the inner side and the outer side.

[0064] As shown in Figure 1 and Figure 2 Further, the sealing sleeve 2 is detachably installed on the outer rod 1a by the first hexagonal bolt 21, which facilitates the installation and disassembly of the sealing sleeve 2.

[0065] Further, a structural adhesive is arranged between the sealing sleeve 2 and the outer rod 1a, which can increase the connection strength between the sealing sleeve 2 and the outer rod 1a, and the structural adhesive arranged between the sealing sleeve 2 and the outer rod 1a can effectively fill the gap between the sealing sleeve 2 and the outer rod 1a, thereby maintaining the sealing of the sealing sleeve 2 and the outer rod 1a, avoiding the penetration of clay or mud between the sealing sleeve 2 and the outer rod 1a through the gap, and rusting the outer rod 1a and the sealing sleeve 2.

[0066] As shown in Figure 9 andFigure 10 Further, the sealing sleeve 2 comprises a first pipe segment 24 and a second pipe segment 23 mounted on the first pipe segment 24, the first pipe segment 24 is detachably mounted on the outer rod 1a by the first hexagonal bolt 21, the second pipe segment 23 is detachably mounted on the first pipe segment 24 by the second hexagonal bolt 22, the sealing sleeve 2 is provided with a space for accommodating the first elastic member 32 and the sealing ring 31, the sealing sleeve 2 is provided as a split type first pipe segment 24 and second pipe segment 23, the first pipe segment 24 and the second pipe segment 23 enclose the space for accommodating the first elastic member 32 and the sealing ring 31. Compared with the sealing sleeve 2 of the integrated type, the split type first pipe segment 24 and second pipe segment 23 are beneficial to reduce the production cost and the installation difficulty of the first elastic member 32 and the sealing ring 31.

[0067] Embodiment Two

[0068] The same parts in this embodiment as in Embodiment One are given the same reference numerals, and the same textual description is omitted.

[0069] Compared with Embodiment One, the sealing telescopic drill rod provided in this embodiment also has the following different structural design: Figure 3 Figure 4 Figure 10 As shown in the figure, the sealing telescopic drill rod further comprises a mud scraping part 4, the mud scraping part 4 is mounted on the sealing sleeve 2, the mud scraping part 4 abuts against the outer wall of the inner rod 1b, during the underground operation process, the outer circumferential surface of the inner rod 1b will be hung with mud, clay, silt and other pollutants, the mud scraping part 4 abutting against the outer circumferential surface of the inner rod 1b is used to scrape off the mud, clay, silt and other pollutants hung on the outer circumferential surface of the inner rod 1b, so as to avoid the mud, clay, silt and other pollutants from entering between the sealing ring 31 and the inner rod 1b, damaging the sealing ring 31 and the inner rod 1b, and affecting the sealing effect of the sealing ring 31 on the outer rod 1a and the inner rod 1b. Preferably, the mud scraping part 4 is mounted on the second pipe segment 23.

[0070] Further, a second elastic member is arranged between the mud scraping part 4 and the sealing sleeve 2, the second elastic member is one or a combination of a spring and rubber; the mud scraping part 4 abuts against the outer circumferential surface of the inner rod 1b under the action of the second elastic member, so as to ensure the effect of scraping off the pollutants on the outer circumferential surface of the inner rod 1b, and the second elastic member is preferably rubber, which is convenient for installation.

[0071] Alternatively, the mud scraping part 4 has elasticity, the diameter of the intermediate hole formed by the mud scraping part 4 is smaller than the outer diameter of the inner rod 1b and the mud scraping part 4 has elastic deformation capability, after the mud scraping part 4 is mounted on the inner rod 1b, the mud scraping part 4 abuts against the outer circumferential surface of the inner rod 1b under the action of its own elasticity to ensure the effect of scraping off the pollutants on the outer circumferential surface of the inner rod 1b.

[0072] As shown in the figure, the sealing telescopic drill rod further comprises a mud scraping part 4, the mud scraping part 4 is mounted on the sealing sleeve 2, the mud scraping part 4 abuts against the outer wall of the inner rod 1b, during the underground operation process, the outer circumferential surface of the inner rod 1b will be hung with mud, clay, silt and other pollutants, the mud scraping part 4 abutting against the outer circumferential surface of the inner rod 1b is used to scrape off the mud, clay, silt and other pollutants hung on the outer circumferential surface of the inner rod 1b, so as to avoid the mud, clay, silt and other pollutants from entering between the sealing ring 31 and the inner rod 1b, damaging the sealing ring 31 and the inner rod 1b, and affecting the sealing effect of the sealing ring 31 on the outer rod 1a and the inner rod 1b. Preferably, the mud scraping part 4 is mounted on the second pipe segment 23. Figure 11 ​​As shown in the drawings, further, the mud scraping part 4 is spirally arranged on the sealing sleeve 2, or the mud scraping part 4 is spirally arranged on the side of the inner rod 1b; preferably, the number of spiral turns is greater than 2 turns. The spiral mud scraping part 4 can scrape the mud scraping part 4 at least twice to enhance the removal effect of the pollutants, and the integrated mud scraping part 4 facilitates the installation of the mud scraping part 4.

[0073] As shown in the drawings, Figure 3 , Figure 4 Alternatively, a plurality of annularly arranged mud scraping parts 4 are vertically spaced and arranged on the sealing sleeve 2, and the vertically spaced and sleeved plurality of mud scraping parts 4 can form a plurality of times of scraping effect on the outer circumferential surface of the inner rod 1b, thereby enhancing the removal effect of the pollutants.

[0074] Embodiment three

[0075] In this embodiment, the same parts as in Embodiment One and Embodiment Two are given the same reference numerals, and the same textual description is omitted.

[0076] Compared with Embodiment One and Embodiment Two, the sealing telescopic drill rod provided in this embodiment has the following different structural design: as shown in the drawings, Figure 5 , Figure 6 The sealing sleeve 2 is provided with a liquid storage groove 5, the liquid storage groove 5 is arranged between the sealing ring 31 and the mud scraping part 4, the liquid storage groove 5 is filled with liquid, and the clay or mud on the outer circumferential surface of the inner rod 1b can be removed by the mud scraping part 4 during the retraction or extension of the inner rod 1b. When the remaining clay or mud comes into contact with the liquid in the liquid storage groove 5, the remaining clay and mud will dissolve in the liquid in the liquid storage groove 5, thereby avoiding excessive wear or corrosion of the sealing ring 31 by the clay and mud, ensuring the sealing effect of the sealing ring 31 on the outer rod 1a and the inner rod 1b, and reducing the corrosion of the clay and mud on the outer circumferential surface of the inner rod 1b, thereby improving the service life of the inner rod 1b.

[0077] Further, the sealing sleeve 2 is provided with a liquid outlet flow channel and a liquid inlet flow channel communicating with the liquid storage groove 5, the liquid inlet flow channel and / or the liquid outlet flow channel are provided with a detachable plugging member 51, when the liquid is replaced, the contaminated liquid flows out of the liquid outlet flow channel, and the clear liquid is filled into the liquid storage groove 5 from the liquid inlet flow channel. When the telescopic drill rod is not used, the liquid in the liquid storage groove 5 is emptied and sealed by the plugging member 51.

[0078] The principles and implementation modes of the present application are described by using specific examples in this paper, and the above description of the embodiments is only used to help understand the core idea of the present application. It should be pointed out that for ordinary skilled persons in the technical field, without departing from the principles of the present application, the present application can be improved and modified in many ways, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A sealed telescopic drill rod characterized in that, The sealing sleeve (2) is provided with a second pipe section (25) which is radially abutted to the outer sidewall of the inner rod (1b), and the second pipe section (25) is provided with a receiving groove (28) and a sealing ring (31) arranged in the receiving groove (28), and the sealing ring (31) is elastically connected to the receiving groove (28) by a first elastic member (32); When the inner rod (1b) and the outer rod (1a) are in the relative sliding working condition, the sealing ring (31) can be radially retracted; when the inner rod (1b) and the outer rod (1a) are in the relative static working condition, the sealing ring (31) is driven by the first elastic member (32) to radially protrude outward to abut to the outer sidewall of the inner rod (1b).

2. The sealed telescopic drill pipe of claim 1, wherein, The sealing ring (31) comprises an axially extending ring body (31a), and an upper turning edge (31b) and a lower turning edge (31c) are correspondingly arranged at both ends of the ring body (31a) and extend radially outward; the upper turning edge (31b) and the lower turning edge (31c) are always located in the receiving groove (28) and axially abut to the groove sidewall of the corresponding side of the receiving groove (28) and can slide radially relative to the groove sidewall of the corresponding side.

3. The sealed telescopic drill pipe of claim 2, wherein, Part of the groove wall of the receiving groove (28), the ring body (31a), the lower wall surface of the upper turning edge (31b) and the upper wall surface of the lower turning edge (31c) form a closed receiving cavity, and the first elastic member (32) is arranged in the receiving cavity.

4. The sealed telescopic drill pipe of claim 3, wherein, The first elastic member (32) is a ring-shaped elastic bag body.

5. The sealed telescopic drill pipe of claim 4, wherein, The sealing sleeve (2) comprises a first pipe portion (27), the second pipe section (25) is arranged on the first pipe portion (27), the first pipe portion (27) further comprises a first pipe section (24) and a third pipe section (26), the inner sidewall of the first pipe section (24) is radially pressed against the outer sidewall of the outer rod (1a), and the third pipe section (26) is located on the side of the second pipe section (25) away from the first pipe section (24). The sealing sleeve (2) further comprises a second pipe portion (23) which is radially abutted to the outer sidewall of the inner rod (1b), the third pipe section (26) is sleeved on the second pipe portion (23) and detachably connected to the second pipe portion (23), and a mud scraping portion (4) is further arranged between the second pipe portion (23) and the outer sidewall of the inner rod (1b).

6. The sealed telescopic drill pipe of claim 5, wherein, The second pipe portion (23) is further provided with a liquid storage groove (5), and the liquid storage groove (5) is located on the upper side of the mud scraping portion (4).

7. The sealed telescopic drill pipe of claim 6, wherein, The third pipe section (26) is provided with a liquid outlet flow channel and a liquid inlet flow channel which communicate with the liquid storage groove (5) and the outside, and the liquid inlet flow channel and the liquid outlet flow channel can be switched between the open state and the closed state.

8. The sealed telescopic drill pipe of claim 5, wherein, At least part of the upper end surface of the second pipe portion (23) constitutes a groove side wall of the accommodating groove (28) and axially abuts against a lower wall surface of the downward turned edge (31c).

9. The sealed telescopic drill pipe of claim 5, wherein, The mud scraping portion (4) is elastic; or, A second elastic member is arranged between the mud scraping portion (4) and the second pipe portion (23), the second elastic member being one of a spring and rubber, or a combination of both.

10. The sealed telescopic drill pipe of claim 5, wherein, The mud scraping portion (4) extends around the inner rod (1b) in a spiral shape; or, The second pipe portion (23) is vertically spaced apart and provided with a plurality of closed annular mud scraping portions (4).

11. A seal stinger as claimed in any one of claims 5 to 10, wherein, The first pipe segment (24) is detachably mounted to the outer rod (1a) by a fastener; and / or, A structural adhesive is arranged between the first pipe segment (24) and the outer side wall of the outer rod (1a).

12. The sealing telescopic drill pipe according to any one of claims 1-10, characterized in that, The sealing ring (31) comprises a plurality of arc segments, each of which is arranged around the inner rod (1b) and sequentially inserted at the tail end; the surfaces of two adjacent arc segments are arranged at a certain angle relative to the central axis of the inner rod (1b).

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