Drilling tool escape mechanism

Abstract

The utility model discloses a drilling tool escape mechanism, which relates to the technical field of deep space unmanned drilling, and comprises a speed reducer, an unlocking component is fixed on the speed reducer, the unlocking component is connected with a torsion ring support rod component to form primary reinforcement, and the torsion ring support rod component presses a tensioning component on a shell of the speed reducer to form secondary reinforcement. The tensioning component is connected with the speed reducer and the drilling tool component, the drilling tool component comprises a drilling tool shell and a drilling rod, the end face of the drilling rod is connected to an end face fluted disc, and the end face fluted disc is arranged at the output end of the speed reducer. The drilling tool releasing mechanism is small in occupied size and light in weight, does not affect center transmission, has large force increasing capacity among all the components, is small in stress of the unlocking rope, is not prone to creep deformation, and can be kept stable for a long time. The torsion ring supporting rod component and the tensioning component form a critical stable state, and it is guaranteed that the torsion ring supporting rod component and the drilling tool can be smoothly disconnected after unlocking.

Description

Technical Field

[0001] This utility model relates to the field of deep space unmanned drilling technology, and in particular to a drill tool escaping mechanism. Background Technology

[0002] When a stuck drill bit occurs during deep space unmanned drilling, there are limited methods for escaping the predicament, which could very likely leave the probe stuck in place and unable to carry out subsequent exploration work. The drill bit escaping mechanism serves as a last resort in case of drilling failure, separating the reducer from the drill string when the drill bit is stuck and cannot be pulled out, allowing the probe to continue to perform other tasks. Utility Model Content

[0003] The purpose of this utility model is to provide a drill bit detachment mechanism to solve the problem that when the drill bit gets stuck and cannot be pulled out, the detector is trapped in place and cannot carry out subsequent detection work.

[0004] To achieve the above objectives, this utility model provides a drill bit escaping mechanism, including a reducer. An unlocking component is fixed on the reducer. The unlocking component is connected to a torsion ring support component to form a primary force amplification. The torsion ring support component presses a tensioning component onto the housing of the reducer to form a secondary force amplification. The tensioning component connects the reducer and the drill bit component. The drill bit component includes a drill bit housing and a drill rod. The end face of the drill rod is connected to an end face gear plate, which is located at the output end of the reducer.

[0005] Preferably, the unlocking component includes an anchor point fixed on the reducer, a connecting rope, and a hot knife assembly. The hot knife assembly includes a hot knife housing and a resistance wire disposed inside the hot knife housing. The resistance wire includes a tungsten wire and copper rods connected to both ends of the tungsten wire.

[0006] One end of the connecting rope passes through the tungsten wire and is connected to the anchor point.

[0007] Preferably, the torsion ring support rod component includes a torsion ring fixedly connected to the other end of the connecting rope, a support rod fixedly connected to the torsion ring, and a ball cup fixedly connected to the end of the support rod.

[0008] Preferably, the tensioning component includes a steel ball, a steel strip, and a slatted wire, wherein the slatted wire is disposed on the stop at the connection between the reducer and the drill housing, for limiting the rotation of the drill housing;

[0009] Both the steel ball and the steel strip are mounted on the ball cup, and a set screw is mounted on the steel strip, which connects the drill housing and the steel strip.

[0010] Preferably, the hot knife housing has a drum-shaped cavity inside, and the inner surface of the drum-shaped cavity is coated with a high-reflectivity coating.

[0011] Preferably, the extension line of the support rod is tangent to the small circle at the center of the torsion ring, and the width of the support rod is greater than its thickness.

[0012] Preferably, the steel ball is used to clamp and fix the steel strip with rivets.

[0013] Therefore, the present invention employs the above-mentioned drill bit escaping mechanism, which has the following beneficial effects:

[0014] (1) This mechanism forms a two-stage force-increasing structure through the torsion ring support rod component and the tensioning component, which provides a large force-increasing ratio, greatly reduces the size and mass of the connecting rope and the hot knife, makes the overall volume of the escape mechanism very small, and reduces the power supply required for the hot knife to unlock.

[0015] (2) The torsion ring support component set in this mechanism can form a stable state and an unstable state, ensuring the reliability of the connection and separation of the drill bit through the escaping mechanism.

[0016] (3) The torsion ring support rod of this mechanism is evenly distributed around the circumference and has a good stress state. At the same time, the torsion ring is hollow and does not affect the original center torsion transmission arrangement of the drill bit. This allows the escape mechanism to be designed inside the drill bit shell without changing the outer envelope of the drill bit, resulting in good product adaptability.

[0017] (4) The installation method of this mechanism is simple and easy to operate, ensuring the reliability of the mechanism's function.

[0018] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of an embodiment of a drill bit escaping mechanism according to the present invention;

[0020] Figure 2 This is a cross-sectional view of the torsion ring support component of a drill bit escaping mechanism according to the present invention;

[0021] Figure 3 This is a schematic diagram of the hot knife assembly of a drill bit escaping mechanism according to the present invention;

[0022] Figure 4 This is a schematic diagram showing the disassembled structure of the hot knife assembly of a drill bit escaping mechanism according to the present invention;

[0023] Figure 5 This is a schematic diagram showing the connection between the steel ball and the steel strip in a drill bit detachment mechanism according to this utility model;

[0024] Figure 6 This is a schematic diagram of the external structure of a drill bit escaping mechanism according to the present invention;

[0025] Reference numerals: 1. Reducer; 2. Hot cutter assembly; 21. Hot cutter housing; 22. Copper pillar; 23. Tungsten wire; 3. Connecting rope; 4. Anchor point; 5. Torsion ring; 6. Support rod; 7. Ball cup; 8. Steel ball; 81. Rivet; 9. Steel strip; 10. Slip thread; 11. Set screw; 12. End face gear plate; 13. Drill tool housing; 14. Drill rod. Detailed Implementation

[0026] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0027] Unless otherwise defined, the technical or scientific terms used in this utility model shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0028] Example

[0029] Please see Figure 1-6 This utility model provides a drill bit escaping mechanism, including a reducer 1. In this embodiment, the reducer 1 refers to a power output device and does not specifically refer to a reducer. An unlocking component is fixed on the reducer 1, which switches the escaping mechanism from a stable state to an unstable state. The unlocking component is connected to a torsion ring support rod component, stabilizing the torsion ring 5 and support rod 6, forming a first-level force amplification. During escaping and unlocking, the connecting rope 3 disconnects, causing the torsion ring 5 and support rod 6 to become unstable. The torsion ring support rod component presses the steel ball 8 in the tensioning component onto the housing of the reducer 1, forming a second-level force amplification. The stable and unstable states are formed by the unlocking component. The tensioning component connects the reducer 1 and the drill bit component, providing the bending moment for the drill bit component during operation. The drill bit component includes a drill bit housing 13 and a drill rod 14. The end face of the drill rod 14 is connected to an end face gear disk 12, which is located at the output end of the reducer 1. When the end face gear disk 12 is working, it transmits the torque of the drill rod 14. Escaping involves disconnecting from the drill rod 14. Besides using the end face gear disc 12, torque can also be transmitted using gear meshing, friction discs, etc. For example... Figure 6 The diagram shows the external outline of the drill string. The escape mechanism is completely installed inside the reducer 1 housing and the drill string housing 13, without increasing the envelope size of the drill string.

[0030] The unlocking components include an anchor point 4 fixed to the reducer 1, a connecting rope 3, and a hot knife assembly 2. The hot knife assembly 2 includes a hot knife housing 21 and a resistance wire disposed inside the housing 21. The resistance wire includes a tungsten wire 23 and copper posts 22 connected to both ends of the tungsten wire 23. The housing 21 has a drum-shaped cavity inside, and the inner surface of the drum-shaped cavity is coated with a high-reflectivity coating to reduce the power required for unlocking. One end of the connecting rope 3 passes through the tungsten wire 23 and connects to the anchor point 4. The connecting rope 3 is made of Dyneema fiber. The connecting rope 3 connects the torsion ring 5 to the anchor point 4. When the drill tool is working normally, it maintains the stability of the torsion ring 5. When freed, it is heated and disconnected, causing the torsion ring 5 and the support rod 6 to become unstable, putting the entire freed mechanism in an unstable state. The drill tool is then subjected to a bending moment load, which disconnects it from the detector. The connecting rope 3 can also be made of other materials.

[0031] like Figure 3-4 The diagram illustrates the installation relationship between the hot knife assembly 2 and the connecting rope 3. After the copper pillar 22 and tungsten wire 23 are welded together, the copper pillar 22 is inserted into the hot knife housing 21 through the front opening to form the hot knife assembly 2. Because this mechanism creates a large force amplification ratio and reduces the diameter of the connecting rope, the volume of the hot knife assembly 2 can be significantly reduced, and the operating power of the hot knife can be decreased.

[0032] The torsion ring support rod assembly includes a torsion ring 5 fixedly connected to the other end of the connecting rope 3. A support rod 6 is fixedly connected to the torsion ring 5, and a ball cup 7 is fixedly connected to the end of the support rod 6. Three ball cups 7 and three support rods 6 are provided. The extension lines of the three support rods 6 are tangent to the small circle at the center of the torsion ring 5. The lever arm of the support rod 6 is very short, while the lever arm formed by the torsion ring 5 and the connecting rope 3 is much larger than the lever arm formed by the support rod 6, creating a first-order force amplification. The two end planes of the support rod 6 contact the torsion ring 5 and the ball cup 7, forming a stable support rod that prevents further rotation of the torsion ring 5 under the pull of the connecting rope 3 and rotation of the ball cup 7 around the steel ball 8. Furthermore, the width of the support rod 6 is greater than its thickness, preventing axial bending of any part of the torsion ring support rod assembly. Figure 2 As shown, the geometric relationship of the torsion ring support rod components is illustrated. The support rod 6 is tangent to a small circle at the center of the torsion ring 5. The radius of the small circle is the lever arm length of the force exerted by a single support rod 6 on the torsion ring 5. The lever arm length of the connecting rope 3 is the distance from the fixed point of the connecting rope 3 on the arm of the torsion ring 5 to the center of the torsion ring 5.

[0033] The tensioning component is used to apply prestress to the connection between the drill string assembly and the reducer 1 outside the drill string housing 13, providing bending moment for the drill string assembly during operation and ensuring bending stiffness. The tensioning component includes a steel ball 8, a steel strip 9, and a spur thread 10. The spur thread 10 is installed on the stop at the connection between the reducer 1 and the drill string housing 13 to restrict the rotation of the drill string housing 13. In addition to using the spur thread 10, it can also be fixed by square keys, adhesive bonding, etc.

[0034] Both the steel ball 8 and the steel strip 9 are mounted on the ball cup 7. The steel ball 8 clamps and fixes the steel strip 9 to itself using rivets 81. The steel ball 8 serves as a clamping point, and its spherical shape balances the secondary force amplification capability with reliability during unlocking. When the steel ball 8 detaches from the housing of the reducer 1, the steel strip 9 bends in the thickness direction as the steel ball 8 detaches. The steel strip 9 has very low stiffness in the thickness direction, ensuring the reliability of the steel ball 8's detachment.

[0035] A set screw 11 is provided on the steel strip 9, which connects the drill housing 13 and the steel strip 9. In addition to preloading the steel strip 9 and fixing it with the set screw 11, steel wire rope preloading and adhesive bonding can also be used. The steel wire rope can replace the steel strip, and adhesive bonding can replace the set screw.

[0036] like Figure 5 The diagram illustrates the connection between the steel ball 8 and the steel strip 9. The steel strip 9 is folded multiple times and clamped inside the steel ball 8 by rivets 81. The steel ball 8 is fixed to the housing of the reducer 1, and the steel strip 9 is fixed to the housing 13 of the drill bit. The steel strip 9 is only subjected to tensile loads and has a good stress state. The multiple folding of the steel strip 9 is to improve the stress state of the contact between the steel strip 9 and the steel ball 8.

[0037] During drilling, the steel ball 8 is pressed by the support rod 6 under pressure along the direction of the rivet 81, and the tension of the steel strip 9 is provided by the friction between the steel strip 9 and the steel ball 8. The rivet 81 does not bear any working load, so it does not need to have high strength and can be designed to be relatively small. The contact angle between the steel ball 8 and the housing of the reducer 1 creates a second stage of force amplification. When the escape mechanism becomes unstable, the spherical structure ensures the reliability of the steel ball 8's release from the housing of the reducer 1.

[0038] In this embodiment, the tangential radius of the extended line of the support rod 6 is 0.5 mm, the lever arm of the torsion ring 5 is 11.5 mm, the first-level force amplification ratio is 7.67, the second-level force amplification ratio is 3.86, and the total force amplification ratio is 29.6. The connecting rope 3 is made of φ0.3 mm diameter Dyneema fiber with a tension of 20 N, and the drill bit components can withstand a bending moment of 9 Nm. The support reaction force at both ends of the support rod 6 is 153.3 N, achieving a reliable connection of the drill bit.

[0039] The installation method of the above-mentioned drill bit escaping mechanism includes the following steps:

[0040] Step 1: Pass the connecting rope 3 through the hot knife assembly 2, install the unlocking component on the housing of the reducer 1, and do not fix the two ends of the connecting rope 3.

[0041] Step 2: Leave the steel belt 9 with a reserved length, place the three steel balls 8 and the steel belt 9 in the recess on the housing of the reducer 1, place the torsion ring support rod component, and gently pull the arm of the torsion ring 5 to make the torsion ring support rod component and the tensioning component stable.

[0042] Step 3: Fix both ends of the connecting rope 3 to the arm of the torsion ring 5 and the anchor point 4 respectively, and install the end face toothed disc 12;

[0043] Step 4: Pass the steel strip 9 through the opening on the drill housing 13, align the end face gear plate 12 with the mounting hole of the slatted wire 10, press the drill housing 13 tightly onto the housing of the reducer 1, and install the slatted wire 10.

[0044] Step 5: Tighten the three steel strips 9 simultaneously with the designed preload, then tighten the three set screws 11 simultaneously to cut the steel strips 9 and complete the installation.

[0045] When unlocking is required, the following steps are included:

[0046] Step S1: When the drill rod 14 encounters a drilling obstacle, it is unlocked. During unlocking, the unlocking component is energized and heated, and the connecting rope 3 is cut.

[0047] Step S2: When the connecting rope 3 is disconnected, the torsion ring 5 and the support rod 6 are in an unstable state;

[0048] Step S3: Apply a bending moment to drill rod 14, support rod 6 pushes torsion ring 5 to twist, torsion ring support rod components disperse, steel ball 8 detaches from the housing of reducer 1, drill tool components separate from reducer 1, completing the escape and unlocking process.

[0049] Therefore, the present invention adopts the above-mentioned drill bit detachment mechanism, which occupies a small volume, is lightweight, does not affect the central transmission, forms a large force amplification capacity between the components, has low stress on the unlocking rope, is not prone to creep, and can maintain the stability of the mechanism for a long time; the torsion ring support component and the tensioning component form a critical stable state, ensuring that the connection with the drill bit can be smoothly disconnected after unlocking.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solution of this utility model, and these modifications or equivalent substitutions cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of this utility model.

Claims

1. A drill bit escaping mechanism, characterized in that: The device includes a reducer, on which an unlocking component is fixed. The unlocking component is connected to a torsion ring support component to form a primary force amplification. The torsion ring support component presses a tensioning component onto the housing of the reducer to form a secondary force amplification. The tensioning component connects the reducer and a drill component. The drill component includes a drill housing and a drill rod. The end face of the drill rod is connected to an end face gear plate, which is located at the output end of the reducer.

2. The drill bit escaping mechanism according to claim 1, characterized in that: The unlocking component includes an anchor point fixed on the reducer, a connecting rope, and a hot knife assembly. The hot knife assembly includes a hot knife housing and a resistance wire disposed inside the hot knife housing. The resistance wire includes a tungsten wire and copper rods connected to both ends of the tungsten wire. One end of the connecting rope passes through the tungsten wire and is connected to the anchor point.

3. The drill bit escaping mechanism according to claim 2, characterized in that: The torsion ring support rod component includes a torsion ring fixedly connected to the other end of the connecting rope, a support rod fixedly connected to the torsion ring, and a ball cup fixedly connected to the end of the support rod.

4. The drill bit escaping mechanism according to claim 3, characterized in that: The tensioning component includes a steel ball, a steel strip, and a slatted wire. The slatted wire is disposed on the stop at the connection between the reducer and the drill housing, and is used to restrict the rotation of the drill housing. Both the steel ball and the steel strip are mounted on the ball cup, and a set screw is mounted on the steel strip, which connects the drill housing and the steel strip.

5. A drill bit escaping mechanism according to claim 4, characterized in that: The hot knife housing has a drum-shaped cavity inside, and the inner surface of the drum-shaped cavity is coated with a high-reflectivity coating.

6. A drill bit escaping mechanism according to claim 5, characterized in that: The extension line of the support rod is tangent to the small circle at the center of the torsion ring, and the width of the support rod is greater than its thickness.

7. A drill bit escaping mechanism according to claim 6, characterized in that: The steel ball is used to clamp and fix the steel strip with rivets.

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