Shock absorber for horizontal directional drilling and reaming

Abstract

The utility model provides a shock absorber for horizontal directional drilling and reaming, two ends of the shock absorber are respectively connected with a drill rod, the shock absorber comprises a core shaft, the core shaft comprises a body and a connecting part which are connected with each other, and the peripheral surface of the body is wavy; the shell is sleeved on the body and extends along the length direction of the mandrel; a plurality of racks which are uniformly distributed around the axis of the shell are arranged on the inner wall of the shell, and the racks are matched with the peripheral surface of the body; a first gap is defined between the inner wall of the shell and the outer peripheral surface of the body; an elastic layer accommodated in the first gap; and the connecting structure sleeves the connecting part and is used for abutting against the bottom of the shell. According to the utility model, the inner wall of the shell is provided with the rack matched with the wavy peripheral surface of the body, and the elastic piece is arranged in the gap between the shell and the rack, so that the transmission of vibration can be isolated under the condition that the torque can be transmitted between the mandrel and the shell, and the vibration transmitted from a drill bit is not transmitted to a drilling machine any more; meanwhile, the structure is clear and compact, and the production and maintenance cost is greatly reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of horizontal directional drilling, and in particular to a shock absorber for reaming holes in horizontal directional drilling. Background Technology

[0002] With the development of the horizontal directional drilling industry, market requirements for its construction are becoming increasingly refined, requiring the use of different equipment or processes for different construction conditions. When enlarging holes in hard rock formations, conventional drill rods inevitably experience drill skipping and resonance, undoubtedly posing significant challenges to the construction. Under these circumstances, prolonged construction significantly impacts the service life of the drilling rig and increases maintenance costs.

[0003] Currently, shock absorbers are used in the market to protect the safety of drilling rigs and ground equipment. However, they generally use springs or hydraulic devices as the elastic medium, which are not only expensive but also have complex structures, resulting in high repair costs if damaged. During borehole reaming, shock absorbers need to be used at high frequency for extended periods, and the excessively high manufacturing and maintenance costs undoubtedly place a significant burden on the construction team.

[0004] Therefore, there is an urgent need for a hole-expanding shock absorber with a clear and compact structure, low cost, and easy maintenance. Utility Model Content

[0005] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a shock absorber for horizontal directional drilling reaming, which has the characteristics of compact structure, low manufacturing cost and convenient maintenance.

[0006] To achieve the above and other related objectives, this utility model provides the following technical solution:

[0007] A shock absorber for horizontal directional drilling includes a mandrel, a body and a connecting part connected to each other, the outer peripheral surface of the body being wavy; a shell sleeved on the body and extending along the length of the mandrel; a plurality of racks evenly arranged around their axis on the inner wall of the shell, the racks being adapted to the outer peripheral surface of the body; a first gap being formed between the inner wall of the shell and the outer peripheral surface of the body; an elastic layer accommodated in the first gap; and a connecting structure sleeved on the connecting part and used to abut against the bottom of the shell.

[0008] To achieve the above technical solution, a rack that matches the wavy outer surface of the body is set on the inner wall of the housing, and an elastic element is set in the gap between the two. This ensures that the torque can be transmitted between the mandrel and the housing in advance, while isolating the transmission of vibration, so that the vibration transmitted from the drill bit is no longer transmitted to the drilling machine.

[0009] Furthermore, the connecting structure includes a flower-shaped baffle and a fixing block that are sequentially fixedly sleeved on the connecting part; the fixing block abuts against the flower-shaped baffle; the flower-shaped baffle includes toothed blocks that are evenly arranged around its outer circumference; the toothed blocks are arranged in a one-to-one correspondence with the toothed rack.

[0010] To achieve the above technical solution, a connecting structure fitted onto the connecting part abuts against the bottom of the housing, limiting the relative displacement between the housing and the spindle, and ensuring the stable operation of the equipment.

[0011] Furthermore, the toothed block is provided with a receiving groove; the rack extends along the length of the housing and is at least partially received in the receiving groove.

[0012] The above technical solution disperses the torque transmitted from the spindle, making the rack more evenly stressed, avoiding deformation of the rack due to excessive instantaneous torque, and improving the service life of the equipment.

[0013] Furthermore, the spindle includes an abutment portion connected to the end of the body away from the connecting portion; the abutment portion abuts against the top of the housing and smoothly transitions with the body.

[0014] The above technical solution achieves the goal of locking the position between the housing and the spindle by the cooperation between the connecting structure and the abutment part, ensuring a stable fit between the housing and the spindle and improving the stability of equipment operation.

[0015] Furthermore, it also includes a connecting tube sleeved on the connecting part; the connecting tube includes a through hole opened along its own length direction; the housing is at least partially accommodated in the through hole.

[0016] Furthermore, the mandrel includes a slurry passage hole extending along its own length; the slurry passage hole is connected to the through hole.

[0017] The above technical solution connects the slurry passage and the through hole, lubricating the drill bit and ensuring normal circulation of mud during the hole enlargement process.

[0018] Furthermore, an anti-expansion clamp is fitted on the outer circumference of the connecting pipe, and the anti-expansion clamp is fitted on the end of the connecting pipe facing the mandrel.

[0019] To achieve the above technical solution, the anti-expansion clamp firmly fixes the connecting pipe to the shell.

[0020] Furthermore, the elastic layer is made of vulcanized rubber.

[0021] As described above, the shock absorber for horizontal directional drilling reaming according to this utility model has the following beneficial effects:

[0022] 1. In this utility model, by designing a rack on the inner wall of the housing that is adapted to the wave-shaped outer circumferential surface of the mandrel, the vibration transmitted from the drill bit is isolated while ensuring that the drill torque can be transmitted to the drill bit, thus ensuring the stable operation of the drill.

[0023] 2. In this utility model, by designing a receiving groove on the flower-shaped baffle used to abut the housing to accommodate part of the rack, the torque transmitted from the spindle can be applied to the housing more evenly, thus extending the service life of the equipment. Attached Figure Description

[0024] Figure 1 The image shown is a cross-sectional view of a shock absorber for horizontal directional drilling and hole enlargement according to this utility model.

[0025] Figure 2 The image shown is an exploded view of a shock absorber for horizontal directional drilling and hole enlargement according to this utility model.

[0026] Figure 3 The image shown is a side view of a shock absorber for horizontal directional drilling and hole enlargement according to this utility model.

[0027] Figure 4 Displayed as Figure 3 A cross-sectional view along AA.

[0028] Figure 5 The diagram shown is a schematic diagram of the internal structure of a shock absorber for horizontal directional drilling and hole enlargement according to this utility model.

[0029] Figure 6 Displayed as this Figure 5 A schematic diagram of a partial method in part B.

[0030] Figure 7 The diagram shown is a structural schematic of the mandrel in this utility model.

[0031] Figure 8 The diagram shown is a structural diagram of the flower-shaped stop bar in this utility model.

[0032] Among them, 1. mandrel; 11. body; 12. connecting part; 13. abutting part; 14. grout passage hole; 2. shell; 21. rack; 22. first gap; 3. elastic layer; 4. connecting structure; 41. flower-shaped baffle; 411. tooth block; 4111. receiving groove; 42. fixing block; 43. disc spring; 5. connecting pipe; 51. through hole; 6. anti-expansion hoop; 1000. a shock absorber for horizontal directional drilling and hole enlargement. Detailed Implementation

[0033] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0034] Please see Figure 1-8It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of this invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this invention, should still fall within the scope of the disclosed technical content. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0035] Please see Figures 1 to 8 This utility model provides a shock absorber 1000 for horizontal directional drilling and hole enlargement, including a mandrel 1, a housing 2, an elastic layer 3, and a connecting structure 4. The mandrel 1 includes a body 11 and a connecting portion 12 connected to each other, and the outer periphery of the body 11 is wavy. The housing 2 is fitted onto the body 11 and extends along its length. The inner wall of the housing 2 is provided with a plurality of racks 21 evenly arranged around its axis. The racks 21 are adapted to the outer peripheral surface of the body 11, and a first gap 22 is formed between the inner wall of the housing 2 and the outer peripheral surface of the body 11.

[0036] Furthermore, the first gap 22 contains an elastic layer 3. Preferably, the elastic layer 3 is made of vulcanized rubber. By providing a toothed rack 21 on the inner wall of the housing 2 that is adapted to the wavy outer peripheral surface of the body 11, and providing an elastic layer 3 in the gap between the two, it is possible to ensure that the mandrel 1 and the housing 2 can transmit torque in advance while isolating the transmission of vibration. This prevents the vibration transmitted from the drill bit from being transmitted to the drilling rig, thus extending the service life of the drilling rig.

[0037] Please continue reading. Figures 6 to 8 The connecting mechanism is sleeved on the connecting part 12 and abuts against the bottom of the housing 2.

[0038] The connecting structure 4 includes a flower-shaped baffle 41 and a fixing block 42 sequentially fixedly sleeved on the connecting part 12, with the fixing block 42 abutting against the flower-shaped baffle 41. Specifically, the flower-shaped baffle 41 includes toothed blocks 411 evenly arranged around its outer circumference, with each toothed block 411 corresponding to a toothed rack 21. The connecting mechanism on the connecting part 12 restricts the relative axial displacement between the housing 2 and the mandrel 1, ensuring that they remain relatively stationary during the hole enlargement process and preventing the gap between them from widening due to vibration as the construction time increases.

[0039] Furthermore, the toothed block 411 is provided with a receiving groove 4111, and the rack 21 extends along the length direction of the housing 2 and is at least partially received in the receiving groove 4111. In this application, by partially receiving the rack 21 in the receiving groove 4111, the abutment between the rack 21 and the flower-shaped baffle 41 is achieved, and the torque transmitted from the spindle 1 is dispersed; this makes the force on the rack 21 more uniform, avoids deformation of the rack 21 due to excessive instantaneous torque, and improves the service life of the equipment.

[0040] Preferably, a disc spring 43 is also provided between the flower-shaped baffle 41 and the fixed block 42. The disc spring 43 is used to withstand large-scale deformation and quickly recover, reducing the impact of vibration on the equipment. Since the fixed block 42 and the flower-shaped baffle 41 are in rigid contact, the impact of vibration between the fixed block 42 and the flower-shaped baffle 41 is relatively large. Due to long-term vibration, the gap between the two will gradually increase. Therefore, a disc spring 43 is provided between them to buffer the vibration, while also maintaining the rigid contact between the fixed block 42 and the flower-shaped baffle 41.

[0041] Please continue reading. Figure 7 The spindle 1 includes an abutment portion 13 connected to one end of the connecting portion 12 of the body 11. The abutment portion 13 abuts against the top of the housing 2 and smoothly transitions with the body 11. Through the cooperation between the connecting structure 4 and the abutment portion 13, the position between the housing 2 and the spindle 1 is locked, ensuring a stable fit between the housing 2 and the spindle 1 and improving the stability of equipment operation.

[0042] Please continue reading. Figures 1 to 3 It also includes a connecting pipe 5 sleeved on the connecting part 12. The connecting pipe 5 includes a through hole 51 opened along its own length direction, and the housing 2 is at least distributed and accommodated in the through hole 51.

[0043] The connecting pipe 5 is fitted with an anti-expansion clamp 6 on its outer circumference. The anti-expansion clamp 6 is fitted on the end of the connecting pipe 5 facing the mandrel 1. One end of the connecting pipe 5 is connected to the drill rod, and the other end is connected to the housing 2. The anti-expansion clamp 6 firmly fixes the connecting pipe 5 and the housing 2 together.

[0044] Furthermore, the mandrel 1 includes a slurry passage 14 extending along its length, which communicates with the through hole 51. The slurry is used to lubricate the drill bit, and the slurry passage 14 communicates with the through hole 51 to ensure normal circulation of the slurry during the reaming process.

[0045] The implementation principle of the shock absorber 1000 for horizontal directional drilling reaming in this utility model is as follows: The torque on the drilling rig is transmitted to the mandrel 1 in the equipment through the drill rod. The mandrel 1 transmits the torque to the housing 2 through the fit between the body 11 with a wave-shaped outer circumference and the housing 2. Then, the housing 2 and the connecting pipe 5 transmit the torque to the drill rod connected to the connecting pipe 5. The drill rod transmits the vibration from the drill bit to the shock absorber. The vibration is transmitted sequentially along the connecting pipe 5 and the housing 2 to the elastic layer 3. The elastic layer 3 isolates the vibration, and the vibration is no longer transmitted to the mandrel 1. Therefore, the vibration will not be transmitted to the drilling rig, thus ensuring the stable operation of the drilling rig.

[0046] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A shock absorber for horizontal directional drilling and hole reaming, characterized in that, include: The mandrel (1) includes a body (11) and a connecting part (12) that are connected to each other, and the outer peripheral surface of the body (11) is wavy; A housing (2) is fitted onto the body (11) and extends along the length of the spindle (1); the inner wall of the housing (2) is provided with a plurality of racks (21) evenly arranged around its axis, the racks (21) being adapted to the outer peripheral surface of the body (11); a first gap (22) is formed between the inner wall of the housing (2) and the outer peripheral surface of the body (11). An elastic layer (3) is accommodated in the first gap (22); A connecting structure (4) is fitted onto the connecting part (12) and used to abut against the bottom of the housing (2).

2. The shock absorber for horizontal directional drilling reaming according to claim 1, characterized in that, The connecting structure (4) includes a flower-shaped baffle (41) and a fixing block (42) that are fixedly sleeved on the connecting part (12) in sequence; the fixing block (42) abuts against the flower-shaped baffle (41); the flower-shaped baffle (41) includes toothed blocks (411) that are evenly arranged around its outer circumference; the toothed blocks (411) are arranged in a one-to-one correspondence with the rack (21).

3. A shock absorber for horizontal directional drilling reaming according to claim 2, characterized in that, The toothed block (411) has a receiving groove (4111); the rack (21) extends along the length of the shell (2) and is at least partially received in the receiving groove (4111).

4. A shock absorber for horizontal directional drilling reaming according to claim 1, characterized in that, The spindle (1) includes an abutment (13) connected to the end of the body (11) away from the connecting part (12); the abutment (13) abuts against the top of the housing (2) and smoothly transitions with the body (11).

5. A shock absorber for horizontal directional drilling reaming according to claim 1, characterized in that, It also includes a connecting pipe (5) sleeved on the connecting part (12); the connecting pipe (5) includes a through hole (51) opened along its own length direction; the housing (2) is at least partially accommodated in the through hole (51).

6. A shock absorber for horizontal directional drilling reaming according to claim 5, characterized in that, The mandrel (1) includes a slurry passage hole (14) extending through its length; the slurry passage hole (14) is connected to the through hole (51).

7. A shock absorber for horizontal directional drilling reaming according to claim 5, characterized in that, The outer circumferential surface of the connecting pipe (5) is fitted with an anti-expansion clamp (6), which is fitted on the end of the connecting pipe (5) facing the spindle (1).

8. A shock absorber for horizontal directional drilling reaming according to claim 1, characterized in that, The elastic layer (3) is made of vulcanized rubber.

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