Motor-driven columnar vibrator suitable for subglacial lake drilling

Abstract

The invention discloses a motor-driven columnar vibrator suitable for subglacial lake drilling, and belongs to the field of polar subglacial lake drilling, an output shaft of an underwater motor rotates and drives a rotating part comprising a coupler, a cam transmission shaft and a cam to rotate synchronously with the rotating part, and the cam is a circumferential cam with a repeated curved surface; in the rotating process of the cam, the upper surface of the cam makes contact with the cam follower and pushes up a linear vibration component composed of a linear push rod, a vibration mass block, a cam follower installation frame, a spring base, a cantilever bearing and the cam follower, and in the process, a spring is compressed till the cam follower crosses the highest point of the curved surface of the upper surface of the cam; and the spring is released, so that the matching surface between the linear push rod and the frame top plate is impacted to generate vibration, and vibration force is transmitted to the frame bottom plate through the frame side plate to finish single impact. The radial size and the axial size of the vibrator structure can be saved to a great extent, so that the vibrator can be applied to small-diameter drilling.

Description

Technical Field

[0001] The present invention belongs to the field of polar subglacial lake drilling, and more specifically, relates to a motor-driven columnar vibrator suitable for subglacial lake drilling. Background Art

[0002] At present, humans have discovered nearly 700 subglacial lakes in Antarctica. Drilling and sampling research on subglacial lakes is of great scientific significance for obtaining paleoclimate information, evaluating stability, exploring life forms in extreme environments, and understanding the geological structure and processes at the bottom of the ice sheet. Most subglacial lakes are located below a thousand-meter-thick ice sheet, and the maximum thickness of the ice sheet overlying the subglacial lake can reach 3,600 meters. To obtain sediment samples at the bottom of the subglacial lake, the sampling equipment needs to drill through the surface to the ice layer of the subglacial lake before it can reach the bottom of the subglacial lake to carry out sediment sampling operations. The power mode of underwater sediment sampling equipment can be divided into pressure-in, gravity impact, hammer, and vibration types according to their working principles. Among them, the vibration sampling has the highest footage rate, the largest footage depth, and the smallest sample bedding disturbance. However, due to the limited logistics supply capacity in Antarctica, the size of surface drilling equipment is limited. The diameter of the boreholes currently used for subglacial lake detection and sampling is usually in the range of 100 to 300 mm. The power supply mode of the bottom hole equipment usually adopts the power supply mode of surface generators and winch waterproof cables. In addition, due to the low temperature of the ice layer, there is a certain shrinkage phenomenon, and conventional underwater vibration power devices are difficult to drill through subglacial lakes. With the continuous development of bottom hole power technology, underwater motor drive technology has gradually matured. If underwater motors are used as the prime movers of subglacial lake sediment sampling vibration impact devices, and high transmission efficiency rotary-vibration conversion devices suitable for the borehole size are used, the application of efficient vibration devices in subglacial lake sediment sampling can be realized. How to convert the rotary power output by the underwater motor into efficient vibration impact energy, while ensuring that the vibration device can be applied to subglacial lake drilling with limited aperture, is the main technical problem that limits the application of vibration sampling technology in subglacial lake drilling. Summary of the invention

[0003] The purpose of the present invention is to address the technical problem that vibration sampling technology cannot be applied in subglacial lake drilling due to small hole diameter and limited bottom hole energy supply method, and propose a columnar vibrator that can use an underwater motor as a prime mover. The columnar vibrator can increase the energy conversion efficiency and scalability of the vibration impact device in the subglacial lake drilling hole, and reduce the energy loss, structural complexity, production and manufacturing cost of the bottom hole vibration impact device and the dependence on the surface energy supply device.

[0004] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a motor-driven columnar vibrator suitable for drilling holes in subglacial lakes, comprising a frame, a linear bearing, a thrust radial combination bearing, an underwater motor, a cam, a cam drive shaft, a cantilever bearing, a cam follower, a parametric mass block, a cam follower mounting frame, a linear push rod, a spring base, a spring and a spring top seat; the frame comprises a frame top plate, a frame side plate and a frame bottom plate, the frame top plate is opposite to the frame bottom plate, the frame side plate is connected between the frame top plate and the frame bottom plate, and the frame top plate, the frame side plate and the frame bottom plate form a accommodating space; the linear bearing is assembled on the frame top plate; the thrust radial combination bearing and the underwater motor are arranged in the accommodating space; the output shaft of the underwater motor is connected to the cam drive shaft through a coupling; the cam drive shaft and the thrust radial combination bearing are matched in a composite match of hole-shaft clearance match and end face contact, so as to limit the movement of the cam drive shaft to only Radial; the cam and the cam transmission shaft are matched with a hole shaft and are detachably fastened together, and the cam is a circumferential cam with a repeated curved surface, so that the cam follower that is in rolling contact with the cam curved surface rises or falls periodically with the rotating cam; the cantilever bearing and the cam follower are matched with the cam follower mounting frame as a hole shaft and are locked and fixed by matching nuts to form an integrated structure; the outer peripheral surface of the cantilever bearing serves as a rolling contact surface that is in rolling contact with the frame side plate, so that when the cam rotates, the cam follower mounting frame can only perform linear motion; the linear push rod is a T-shaped structure, the bottom is fixed to the cam follower mounting frame by a threaded connection, the top is detachably fixedly connected to the parametric mass block, and the linear push rod is matched with the linear bearing shaft hole; the spring base and the spring top seat are both matched with the linear push rod as a hole shaft clearance, and the spring base and the spring top seat are respectively pressed on the frame top plate and the cam follower mounting frame by springs.

[0005] Furthermore, the linear bearing cooperates with the frame top plate hole axis and is fixed by screws.

[0006] Furthermore, the thrust radial combined bearing and the underwater motor are respectively mounted on the frame side plate through the bearing mounting transverse plate and the underwater motor mounting plate, and the thrust radial combined bearing and the bearing mounting transverse plate are matched through the hole shaft.

[0007] Furthermore, the number of the parametric mass block is at least one.

[0008] Furthermore, the underwater motor is powered by a surface generator in combination with an armored cable winch or a bottom hole battery.

[0009] The working principle of the present invention is as follows:

[0010] After the motor-driven columnar vibrator suitable for drilling holes in subglacial lakes provided by the present invention is assembled, the output shaft of the underwater motor rotates and drives the rotating parts including the coupling, the cam transmission shaft and the cam to rotate synchronously therewith. During the rotation of the cam, its upper surface contacts the cam follower and pushes up the linear push rod, the parametric mass block, the cam follower mounting frame, the spring base, the cantilever bearing and the cam follower to form a linear vibration part. In this process, the spring is compressed until the cam follower passes the highest point of the curved surface on the upper surface of the cam. The spring is released and causes the mating surface between the linear push rod and the frame top plate to impact and vibrate, and transmits the vibration force to the frame bottom plate through the frame side plate to complete a single impact. The upper surface of the cam is a repeated curved surface, thereby forming a plurality of peaks and troughs on the upper surface of the cam. The output shaft of the underwater motor continues to rotate and repeats the above process to achieve high-frequency vibration. The vibration frequency of the entire vibrator can be increased by increasing the number of repeated curved surfaces on the upper part of the cam.

[0011] Through the above design scheme, the present invention can bring the following beneficial effects:

[0012] First, a circular cam with a repeated curved surface is used in combination with a cam follower to achieve periodic linear motion, and spring energy storage is used to generate periodic linear vibration force, which can greatly save the radial and axial dimensions of the vibrator structure, so that the vibrator of the present invention can be used for small diameter drilling.

[0013] Second, the vibrator described in the present invention adopts an underwater motor at the bottom of the hole as the prime mover. The underwater motor is powered by a surface generator with an armored cable winch or a battery at the bottom of the hole. The surface supporting equipment is simple and the application occasions are wider.

[0014] Third, the vibrator described in the present invention is a columnar structure. For applications with higher requirements for exciting force values, the exciting force can be increased by increasing the number of parametric mass blocks, or by using the principle of mechanical self-synchronization to connect multiple vibrators in series in a borehole of the same diameter, and by arranging multiple vibrators axially to multiply the vibration force at the bottom of the hole.

[0015] Fourthly, the present invention has a simple structure, is easy to disassemble, maintain and replace, has a low technical complexity and low technical requirements for personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings herein are used to provide a further understanding of the present invention and constitute a part of the present application. The exemplary embodiments of the present invention and their descriptions are used to understand the present invention and do not constitute improper limitations of the present invention. In the accompanying drawings:

[0017] Figure 1 Isometric view of a motor-driven cylindrical vibrator suitable for drilling holes in subglacial lakes.

[0018] Figure 2Isometric bottom view of a motor-driven cylindrical vibrator suitable for drilling holes in subglacial lakes.

[0019] Figure 3 Front view of a motor-driven cylindrical vibrator suitable for drilling holes in subglacial lakes.

[0020] Figure 4 A half-section view of the main structure of a motor-driven columnar vibrator suitable for drilling holes in subglacial lakes.

[0021] Figure 5 A partial cross-sectional view of a front view of a motor-driven cylindrical vibrator suitable for drilling holes in subglacial lakes.

[0022] Figure 6 A partial cross-sectional view from the left of a motor-driven cylindrical vibrator suitable for drilling holes in subglacial lakes.

[0023] Figure 7 An isometric diagram of the rotating components of a motor-driven cylindrical vibrator suitable for drilling holes in subglacial lakes.

[0024] Figure 8 This is a front view of the rotating components of a motor-driven columnar vibrator suitable for drilling holes in subglacial lakes.

[0025] Fig. 9 This is a left-side structural diagram of the rotating components of a motor-driven cylindrical vibrator suitable for drilling holes in subglacial lakes.

[0026] Fig.10 An isometric diagram of the linear vibrating component of a motor-driven cylindrical vibrator suitable for drilling holes in subglacial lakes.

[0027] Fig.11 This is a front view of the linear vibration component of a motor-driven columnar vibrator suitable for drilling holes in subglacial lakes.

[0028] Fig.12 This is a left-side structural diagram of the linear vibration component of a motor-driven cylindrical vibrator suitable for drilling holes in subglacial lakes.

[0029] Fig.13 Schematic diagram of a single vibration process of a motor-driven cylindrical vibrator suitable for drilling holes in subglacial lakes.

[0030] The marks in the figure are as follows: 1-first screw; 2-parameter mass block; 3-second screw; 4-frame top plate; 5-frame side plate; 6-bearing mounting cross plate; 7-third screw; 8-underwater motor mounting plate; 9-fourth screw; 10-frame bottom plate; 11-spring top seat; 12-spring; 13-spring base; 14-cam follower mounting frame; 15-cantilever bearing; 16-cam follower; 17-cam; 18-thrust radial combination bearing; 19-coupling; 20-fifth screw; 21-underwater motor; 22-sixth screw; 23-cam transmission shaft; 24-linear push rod; 25-seventh screw; 26-linear bearing; 27-eighth screw. DETAILED DESCRIPTION

[0031] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the present invention are clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the present invention is not limited by the following embodiments, and specific implementation methods can be determined according to the technical solutions of the present invention and actual conditions. In order to avoid confusing the essence of the present invention, known methods, processes, flows, components and circuits are not described in detail. It should be understood that the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" are only used for descriptive purposes, and the features defined as "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" do not represent any order, quantity or importance, but are only used to distinguish different components.

[0032] like Figures 1 to 12As shown, the motor-driven columnar vibrator suitable for subglacial lake drilling proposed by the present invention includes a first screw 1, a parametric mass block 2, a second screw 3, a frame top plate 4, a frame side plate 5, a bearing mounting cross plate 6, a third screw 7, an underwater motor mounting plate 8, a fourth screw 9, a frame bottom plate 10, a spring top seat 11, a spring 12, a spring base 13, a cam follower mounting frame 14, a cantilever bearing 15, a cam follower 16, a cam 17, a thrust radial combination bearing 18, a coupling 19, a fifth screw 20, an underwater motor 21, a sixth screw 22, a cam drive shaft 23, a linear push rod 24, a seventh screw 25, a linear bearing 26 and an eighth screw 27. The frame top plate 4 is opposite to the frame bottom plate 10, and the frame side plate 5 is connected between the frame top plate 4 and the frame bottom plate 10. The frame top plate 4, the frame side plate 5 and the frame bottom plate 10 enclose a accommodating space; the frame top plate 4 is fixed to the frame side plate 5 by the second screw 3, and the frame bottom plate 10 is also fixed to the frame side plate 5 by the sixth screw 22; the bearing mounting cross plate 6 is fixed to the frame side plate 5 by the third screw 7, and the underwater motor mounting plate 8 is fixed to the frame side plate 5 by the fourth screw 9. The linear bearing 26 is matched with the hole axis of the frame top plate 4 and is fixed to the frame top plate 4 by the seventh screw 25. The thrust radial combination bearing 18 is matched with the bearing mounting cross plate 6 through the hole axis clearance. The underwater motor 21 is connected to the underwater motor mounting plate 8 by the fifth screw 20 in a threaded matching manner. The frame top plate 4, the frame side plate 5, the bearing mounting cross plate 6, the underwater motor mounting plate 8, the frame bottom plate 10, the thrust radial combination bearing 18, the underwater motor 21 and the linear bearing 26 can be regarded as an integrated assembly. The thrust radial combined bearing 18 is an industrial product and is a commercially available product that can bear radial and axial loads at the same time.

[0033] like Figure 7 , Figure 8 and Fig. 9 As shown, the cam 17, the cam drive shaft 23 and the coupling 19 form an integrally assembled rotating component. The cam 17 and the cam drive shaft 23 are hole-axis matched and fixed by the eighth screw 27. One end of the coupling 19 is connected to the output shaft of the underwater motor 21, and the other end is connected to the cam drive shaft 23 and locked. The rotation of the output shaft of the underwater motor 21 will drive the coupling 19, the cam drive shaft 23 and the cam 17 to rotate in turn, outputting the speed and torque. At the same time, the cam drive shaft 23 and the thrust radial combination bearing 18 form a hole-axis and end face composite match, and the thrust radial combination bearing 18 simultaneously bears the radial and axial loads in the rotational motion of the cam drive shaft 23.

[0034] like Figure 4 , Figure 5 , Figure 6 , Fig.10 , Fig.11 and Fig.12As shown, the parametric mass block 2, the linear push rod 24, the spring base 13, the cam follower mounting frame 14, the cantilever bearing 15 and the cam follower 16 together constitute an integrally assembled linear vibration component and can make single-degree-of-freedom linear relative motion with the linear bearing 26. At least one parametric mass block 2 is fixed to the top of the linear push rod 24 by a first screw 1. The parametric mass block 2 is an additional structure for increasing the exciting force during the vibration process, that is, under the same vibration speed conditions, the more parametric mass blocks 2 there are, the greater the exciting force is. The number of parametric mass blocks 2 can be increased or decreased according to the vibration force requirements. The linear push rod 24 has a T-shaped structure. The bottom of the linear push rod 24 is fixed to the cam follower mounting frame 14 in a threaded connection. The spring base 13 is nested on the linear push rod 24 and can be pressed against the upper plane of the cam follower mounting frame 14 by a spring 12. The cantilever bearing 15 and the cam follower 16 are both industrial products and are commercially available products. The cantilever bearing 15 and the cam follower 16 are The cam follower mounting frame 14 is hole-shaft matched and is locked and fixed by a matching nut. When the cam 17 rotates and contacts the cam follower 16, not only axial thrust is generated, but also additional torque is generated. In order to ensure that the various components connected to the cam follower mounting frame 14 do not rotate due to this torque, a cantilever bearing 15 is provided on the cam follower mounting frame 14. Since the cantilever bearing 15 is limited by the inner surface of the frame side plate 5, the cantilever bearing 15 is used to keep the cam follower mounting frame 14, the cam follower 16 and the linear push rod 24 only able to perform linear motion. The function of the cam follower 16 is to form contact with the cam 17, and when the cam 17 rotates, the cam follower 16 can drive the cam follower mounting frame 14, the cantilever bearing 15, the linear push rod 24 and the parametric mass block 2 to perform linear motion. The linear push rod 24 and the linear bearing 26 are hole-shaft clearance matched, and the spring top seat 11 is nested on the linear push rod 24 and can be pressed against the lower plane of the frame top plate 4 by the spring 12.

[0035] The cam 17 is a circular cam with a repeated curved surface. Specifically, the structure of the cam 17 is to form at least two arc-shaped curved grooves with the same structure along the circumferential direction on the upper surface of the cylinder. When the cam 17 rotates, since the cam follower 16 can only move axially up and down (reset by the spring 12), the cam follower 16 moves up and down linearly once every time the cam 17 rotates through a period angle, forming a single impact, thereby driving the cam follower mounting frame 14, the cantilever bearing 15, the linear push rod 24 and the parametric mass block 2 to achieve a single impact on the entire vibrator. The cam 17 rotates continuously, and the cam follower 16 and the integrated structure continuously reciprocate linearly, which produces a repeated impact effect, that is, vibration; please refer to the movement process Fig.13 .

[0036] Fig.13 Schematic diagram of a single vibration process of the motor-driven columnar vibrator suitable for drilling holes in subglacial lakes according to the present invention, combined with Figures 3 to 12 After the motor-driven columnar vibrator suitable for drilling holes in subglacial lakes described in the present invention is assembled, the output shaft of the underwater motor 21 is driven to rotate by the supporting power of the underwater motor 21, and the rotating components composed of the coupling 19, the cam transmission shaft 23 and the cam 17 are driven in turn to finally realize the synchronous rotation of the cam 17 and the output shaft of the underwater motor 21. During the rotation of the cam 17, the cantilever bearing 15 installed on the cam follower mounting frame 14 is in line contact with the frame side plate 5. Combined with the hole-shaft clearance between the linear push rod 24 installed as a whole with the cam follower mounting frame 14 and the linear bearing 26, the linear vibration component including the cam follower mounting frame 14 can only make axial linear motion, and the upper repeated curved surface of the cam 17 rolls relative to the cam follower 16. During the process of the cam follower 16 moving from the lowest point to the highest point along the upper repeated curved surface of the cam 17, the cam follower 16 drives the entire linear vibration component to move upward, and the spring 12 is compressed to store elastic potential energy. When the cam follower 16 moves to the upper repeated curved surface of the cam 17, the cam follower 16 moves upward. When the highest point curve ends, the spring 12 releases its elastic potential energy, and the cam follower 16 and the entire linear vibration component move downward rapidly under the elastic force of the spring 12. The linear push rod 24 in the linear vibration component impacts the frame top plate 4, and the frame top plate 4 transmits the impact force to the frame bottom plate 10 through the frame side plate 5. The bottom surface of the frame bottom plate 10 is the power output end of the entire columnar vibrator. At this point, the single vibration process of the motor-driven columnar vibrator suitable for subglacial lake drilling is completed. If the output shaft of the underwater motor 21 continues to rotate, the above-mentioned impact process is repeated, and finally the periodic vibration of the entire columnar vibrator is realized. The vibration frequency of the entire columnar vibrator can be increased by increasing the number of repeated curves on the upper part of the cam 17.

Claims

1. A motor-driven columnar vibrator suitable for drilling holes in subglacial lakes, comprising a frame, wherein the frame comprises a frame top plate (4), a frame side plate (5) and a frame bottom plate (10), wherein the frame top plate (4) is opposite to the frame bottom plate (10), the frame side plate (5) is connected between the frame top plate (4) and the frame bottom plate (10), and the frame top plate (4), the frame side plate (5) and the frame bottom plate (10) enclose an accommodation space; characterized in that: Also includes: A linear bearing (26), a thrust radial combined bearing (18), an underwater motor (21), a cam (17), a cam transmission shaft (23), a cantilever bearing (15), a cam follower (16), a parametric mass block (2), a cam follower mounting frame (14), a linear push rod (24), a spring base (13), a spring (12) and a spring top seat (11); the linear bearing (26) is assembled on the frame top plate (4); the thrust radial combined bearing (18) and the underwater motor (21) are arranged on the frame top plate (4); The accommodating space is provided; the output shaft of the underwater motor (21) is connected to the cam drive shaft (23) through a coupling (19); the cam drive shaft (23) and the thrust radial combined bearing (18) are matched in a composite matching manner of hole-shaft clearance matching and end-face contact, so as to limit the movement of the cam drive shaft (23) only to the radial direction; the cam (17) and the cam drive shaft (23) are hole-shaft matched and detachably fastened together, and the cam (17) is a circumferential cam with a repeated curved surface, so as to be able to be curved with the cam (17). The cam follower (16) with rolling contact with the surface thereof rises or falls periodically with the rotating cam (17); the cantilever bearing (15) and the cam follower (16) are both hole-shaft matched with the cam follower mounting frame (14) and are locked and fixed by matching nuts to form an integrated structure; the outer peripheral surface of the cantilever bearing (15) serves as a rolling contact surface for rolling contact with the frame side plate (5), so that when the cam (17) rotates, the cam follower mounting frame (14) can only perform linear motion; the linear thrust bearing (15) is provided with a plurality of cam follower mounting frames (14) and a plurality of cam follower mounting frames (14) ... provided with a plurality of cam follower mounting frames (14) provided with a plurality of cam follower The rod (24) is in a T-shaped structure, the bottom is fixed to the cam follower mounting frame (14) by means of a threaded connection, the top is detachably fixedly connected to the parametric mass block (2), and the linear push rod (24) is matched with the shaft hole of the linear bearing (26); the spring base (13) and the spring top seat (11) are both matched with the linear push rod (24) in hole-shaft clearance, and the spring base (13) and the spring top seat (11) are respectively pressed onto the frame top plate (4) and the cam follower mounting frame (14) by means of a spring (12).

2. The motor-driven columnar vibrator suitable for drilling holes in subglacial lakes according to claim 1, characterized in that: The linear bearing (26) is matched with the hole axis of the frame top plate (4) and is fixed by screws.

3. The motor-driven columnar vibrator suitable for drilling holes in subglacial lakes according to claim 1, characterized in that: The thrust radial combined bearing (18) and the underwater motor (21) are respectively mounted on the frame side plate (5) via a bearing mounting transverse plate (6) and an underwater motor mounting plate (8), and the thrust radial combined bearing (18) and the bearing mounting transverse plate (6) are matched via a hole shaft.

4. The motor-driven columnar vibrator suitable for drilling holes in subglacial lakes according to claim 1, characterized in that: The number of the parametric mass block (2) is at least one.

5. The motor-driven columnar vibrator suitable for drilling holes in subglacial lakes according to claim 1, characterized in that: The underwater motor (21) is powered by a surface generator in combination with an armored cable winch or a bottom hole battery.

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