A coring drilling structure

Abstract

This utility model provides a core drilling structure, comprising: a drill barrel; a vibration mechanism including a cycloidal motor, an eccentric shaft, and at least one eccentric hammer, wherein the output shaft of the cycloidal motor is operatively connected to the eccentric shaft, the eccentric hammer is fixedly mounted on the eccentric shaft, and the eccentric shaft passes through the upper part of the drill barrel, so that when the cycloidal motor drives the eccentric shaft to rotate, the eccentric hammer rotates with the eccentric shaft and drives the drill barrel to vibrate; a drive mechanism including a drive motor and a gearbox, wherein the output end of the drive motor is operatively connected to the input end of the gearbox, and the output end of the gearbox is operatively connected to the drill barrel, so that the drive motor, through the gearbox, drives the drill barrel to rotate around its own axis; the cycloidal motor and the drive motor are independently disposed in the drill barrel, and when the cycloidal motor stops working, the eccentric hammer rotates synchronously with the drill barrel. This solves the technical problem of low drilling efficiency in existing drilling machines.

Description

Technical Field

[0001] This utility model relates to the field of drilling machine technology, and specifically to a core drilling structure. Background Technology

[0002] In fields such as construction, geological exploration, and road construction, coring drilling is a common operation used to obtain cylindrical core samples from target objects. Traditional coring drilling machines typically use a single drive motor to simultaneously provide the rotary cutting power of the drill barrel and the axial vibration impact force. This single power source design has significant limitations: the vibration frequency is strongly coupled with the drill barrel rotation speed, making it impossible to independently adjust the vibration and rotation speed according to actual working conditions (such as encountering hard rock or reinforced concrete). This results in low drilling efficiency and slow progress in hard materials, as well as severe drill bit wear. To improve drilling efficiency in hard strata, existing technologies have introduced designs that add an independent vibration mechanism to the drill barrel. However, these designs are often structurally complex. In non-vibration mode (i.e., when only rotating during drilling), the vibrating component becomes a rotating load, increasing the burden and energy consumption of the drive motor. It may even cause abnormal vibration of the equipment due to unbalanced centrifugal force, affecting drilling quality and equipment lifespan. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a core drilling structure that solves the technical problem of low drilling efficiency in existing drilling machines.

[0004] According to an embodiment of the present invention, a core drilling structure includes: Drill barrel; The vibration mechanism includes a cycloidal motor, an eccentric shaft, and at least one eccentric hammer. The output shaft of the cycloidal motor is connected to the eccentric shaft for transmission. The eccentric hammer is fixedly installed on the eccentric shaft. The eccentric shaft passes through the upper part of the drill barrel so that when the cycloidal motor drives the eccentric shaft to rotate, the eccentric hammer rotates with the eccentric shaft and drives the drill barrel to vibrate. The drive mechanism includes a drive motor and a gearbox. The output end of the drive motor is connected to the input end of the gearbox, and the output end of the gearbox is connected to the drill barrel, so that the drive motor drives the drill barrel to rotate around its own axis through the gearbox. The cycloidal motor and the drive motor are independently installed in the drill barrel. When the cycloidal motor stops working, the eccentric hammer rotates synchronously with the drill barrel.

[0005] Preferably, there are two eccentric hammers, which are symmetrically arranged at both ends of the eccentric shaft.

[0006] Preferably, the eccentric hammer has multiple sets of adjustment holes along the radial direction, and the bolt that can be selectively inserted through any one of the adjustment holes of the eccentric hammer can be detachably connected to the eccentric shaft.

[0007] Preferably, a lip-shaped sealing ring is fitted at the connection between the output shaft of the cycloidal motor and the eccentric shaft.

[0008] Preferably, the connection end between the eccentric shaft and the drill barrel is provided with a buffer member, which is sleeved on the end of the eccentric shaft and sandwiched between the eccentric shaft and the inner wall of the drill barrel.

[0009] Preferably, the buffer is made of nitrile rubber.

[0010] Preferably, it also includes a control system, the control system comprising: A pressure sensor, installed on the inner wall of the drill barrel, is used to detect the resistance between the drill barrel and the workpiece; The controller is electrically connected to the pressure sensor, the cycloidal motor, and the drive motor, respectively.

[0011] Compared with the prior art, this utility model has the following advantages: the cycloidal motor and the drive motor are completely independent, and the operator can independently and accurately control the vibration frequency and drill barrel speed according to different working conditions such as rock hardness and concrete grade. Only the drive motor can be turned on for smooth rotation and core sampling, saving energy. In hard strata, vibration and rotation can be started at the same time. High-frequency vibration is used to break rocks and reduce cutting resistance, making rotational cutting twice as effective and greatly improving drilling speed and efficiency. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the drilling structure in one embodiment of the present invention; Figure 2 This is a schematic diagram of the eccentric shaft in one embodiment of the present invention.

[0013] In the above attached diagram: 1. Drill barrel; 2. Cycloidal motor; 3. Eccentric shaft; 4. Eccentric hammer; 41. Adjustment hole; 42. Bolt; 5. Drive motor; 6. Gearbox. Detailed Implementation

[0014] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0015] like Figures 1-2 As shown, a core drilling structure includes: Drill barrel 1; The vibration mechanism includes a cycloidal motor 2, an eccentric shaft 3, and at least one eccentric hammer 4. The output shaft of the cycloidal motor 2 is connected to the eccentric shaft 3 for transmission. The eccentric hammer 4 is fixedly installed on the eccentric shaft 3. The eccentric shaft 3 passes through the upper part of the drill barrel 1 so that when the cycloidal motor 2 drives the eccentric shaft 3 to rotate, the eccentric hammer 4 rotates with the eccentric shaft 3 and drives the drill barrel 1 to vibrate. The drive mechanism includes a drive motor 5 and a gearbox 6. The output end of the drive motor 5 is connected to the input end of the gearbox 6, and the output end of the gearbox 6 is connected to the drill barrel 1, so that the drive motor 5 drives the drill barrel 1 to rotate around its own axis through the gearbox 6. The cycloidal motor 2 and the drive motor 5 are independently installed in the drill barrel 1. When the cycloidal motor 2 stops working, the eccentric hammer 4 rotates synchronously with the drill barrel 1.

[0016] In this embodiment, the drill barrel 1 is used to perform actual drilling and extract rock cores or concrete core samples. The vibration mechanism is used to apply vibration during drilling to improve drilling efficiency and reduce the risk of stuck drill bit. The drive mechanism is used to drive the drill barrel 1 to rotate and realize the drilling action. The vibration mechanism includes a cycloidal motor 2, an eccentric shaft 3, and an eccentric hammer 4. The cycloidal motor 2 is used to drive the drill barrel 1 to generate vibration. The eccentric shaft 3 is connected to the output shaft of the cycloidal motor 2. The eccentric hammer 4 is mounted on the eccentric shaft 3 and generates centrifugal force as it rotates, thereby inducing vibration. The eccentric shaft 3 passes through the upper part of the drill barrel 1 but is not rigidly connected to the drill barrel 1. When the cycloidal motor 2 (connected to the power source) is working, the eccentric hammer 4 rotates to generate vibration, causing the entire drill barrel 1 to vibrate. The drive mechanism includes a drive motor 5 and a gearbox 6. The drive motor 5 is the main rotational power source, and the gearbox 6 is used to adjust the speed to match the working requirements of the drill barrel 1. The power is transmitted through the gearbox 6, ultimately driving the drill barrel 1 to rotate continuously around its central axis. In addition, when the cycloidal motor 2 stops working, the eccentric hammer 4 no longer rotates actively, but because it is installed on the upper part of the drill barrel 1, it will passively rotate with the drill barrel 1. At this time, no additional vibration is generated, realizing the function of independent start and stop of vibration. This avoids the problem of inflexible control caused by the linkage of traditional vibration and rotation. Depending on the application scenario, the working state of the cycloidal motor 2 and the drive motor 5 can be switched. When the cycloidal motor 2 is off, the drive motor 5 is on, and the drill barrel 1 maintains rotation but does not vibrate. This is suitable for softer, more uniform strata, or core sampling operations that require maintaining the integrity of the rock core. When the cycloidal motor 2 is on, the drive motor 5 is also turned on simultaneously. The drill barrel 1 maintains rotation and vibration. This is suitable for hard, broken, or cohesive strata. Vibration can effectively break rocks, reduce the risk of stuck drill, and improve drilling efficiency.

[0017] There are two eccentric hammers 4, which are symmetrically arranged at both ends of the eccentric shaft 3.

[0018] In this embodiment, two eccentric hammers 4 are installed at opposite ends of the eccentric shaft 3, and they are symmetrically distributed with respect to the center point of the eccentric shaft 3. The main purpose is to balance and optimize the vibration effect. When the two symmetrical eccentric hammers 4 rotate at the same speed and phase (i.e., rotate to the same side simultaneously), the centrifugal forces they generate in the horizontal direction will cancel each other out. However, in the vertical direction (or the axial direction of the drill barrel 1), the centrifugal forces they generate will superimpose, producing a strong, periodic, unidirectional excitation force along the axis of the drill barrel 1. This excitation force will be transmitted to the drill bit for impacting and breaking rocks, while minimizing useless lateral vibrations. The power of the motor is concentrated into axial impact force, resulting in high energy utilization and better rock breaking effect.

[0019] The eccentric hammer 4 has multiple sets of adjustment holes along the radial direction, and the bolt that can be selected to pass through any one of the adjustment holes can be detachably connected to the eccentric shaft 3.

[0020] In this embodiment, multiple sets of adjustment holes are formed radially (i.e., from the center of rotation to the edge) on the eccentric hammer 4. The adjustment holes are located at different distances from the center of rotation. The eccentric hammer 4 is detachably fixed to the eccentric shaft 3 by bolts passing through one set of adjustment holes. The magnitude of the excitation force (centrifugal force) is determined by the formula F = mω²r, where: m is the mass of the eccentric hammer 4, ω is the angular velocity of the cycloidal motor 2, and r is the eccentricity, i.e., the distance from the center of gravity of the eccentric hammer 4 to the axis of rotation. The operator can select different adjustment holes according to the hardness of the formation or drilling requirements. When an outer adjustment hole is selected, the center of gravity of the eccentric hammer 4 is farther from the center of rotation, and the eccentricity r increases. According to the formula, the generated excitation F will be larger, which is suitable for harder and more difficult-to-break rock formations. When an inner adjustment hole is selected, the center of gravity of the eccentric hammer 4 is closer to the center of rotation, and the eccentricity r decreases. The generated excitation force F will be smaller, which is suitable for softer rock formations or conditions that require gentle vibration to protect the rock core.

[0021] A lip-shaped sealing ring is fitted at the connection between the output shaft of the cycloidal motor 2 and the eccentric shaft 3.

[0022] In this embodiment, the sealing ring is located on the output shaft of the cycloidal motor 2 and the eccentric shaft 3 connected thereto. The lip seal is usually composed of a metal skeleton and a rubber (or polyurethane, etc.) sealing lip, which is used to seal the line contact between the cutting edge (lip) and the surface of the rotating shaft. The drilling site is full of highly abrasive contaminants such as mud, rock powder, sand, and water. When the output shaft is not rotating, the lip tightly holds the output shaft with the interference fit, thus achieving a seal. When the output shaft rotates at high speed, its sealing effect is better. The pressure of the fluid (oil or mud) will act on the lip, making it press more tightly against the surface of the output shaft, thus achieving a self-tightening seal. There is usually a weak spiral oil return line at the lip, which can pump the small amount of fluid that may occasionally seep out back into the sealing cavity. This can prevent contaminants from entering from the connection gap between the cycloidal motor 2 and the eccentric shaft 3, which would rapidly wear down precision transmission components such as bearings and gears, leading to rapid failure of the vibration mechanism. It can also prevent internal lubricating grease leakage.

[0023] The connection end between the eccentric shaft 3 and the drill barrel 1 is provided with a buffer member. The buffer member is sleeved on the end of the eccentric shaft 3 and sandwiched between the eccentric shaft 3 and the inner wall of the drill barrel 1.

[0024] In this embodiment, the buffer is located at the end of the eccentric shaft 3, that is, at the position where the eccentric shaft 3 is supported on the inner wall of the drill barrel 1. (The buffer can be any one of a rubber bushing, a polyurethane ring, or an elastomer bearing) It is sleeved on the end of the eccentric shaft 3 and compressed between the eccentric shaft 3 and the inner wall of the drill barrel 1. It is used to absorb high-frequency impacts and vibrations, effectively absorb and attenuate high-frequency impact forces, prevent them from being directly and rigidly transmitted to the support structure of the drill barrel 1, and reduce the dynamic load transmitted to the bearing and the structure of the drill barrel 1.

[0025] The buffer is made of nitrile rubber.

[0026] In this embodiment, nitrile rubber has excellent oil resistance. Drilling machines usually contain lubricating grease or potentially leaking hydraulic oil. Ordinary rubber (such as natural rubber) will swell, soften, and lose strength and elasticity after contact with mineral oil, and will quickly fail. Nitrile rubber has excellent resistance to petroleum-based oils, greases and fuels, and can maintain its physical and mechanical properties unchanged in oily environments for a long time, thereby ensuring the durability and reliability of the cushioning effect.

[0027] It also includes a control system, which includes: A pressure sensor is installed on the inner wall of the drill barrel 1 to detect the resistance between the drill barrel 1 and the workpiece; The controller is electrically connected to the pressure sensor, the cycloidal motor 2, and the drive motor 5, respectively.

[0028] In this embodiment, the pressure sensor can be a Qitai Sensing QTQ303 series, and the controller model can be PMC100-ZKJ. The pressure sensor is installed on the inner wall of the drill barrel 1 to detect the force and stress generated when the drill bit interacts with the rock, and to detect the resistance experienced by the drill barrel 1 during drilling in real time. The controller is electrically connected to the pressure sensor, the cycloidal motor 2, and the drive motor 5. The controller has preset control logic (algorithm) that can dynamically adjust the working mode of the equipment according to the real-time resistance. The pressure sensor continuously sends resistance data to the controller, and the controller will adjust the real-time resistance... The controller compares the force with a preset threshold or model. When a large resistance is detected (indicating encounter with hard rock or stuck drill bit), the controller will start or increase the power of the cycloidal motor 2 to enhance the vibration intensity and assist in breaking the rock. At the same time, it will appropriately reduce the speed or torque of the drive motor 5 to prevent equipment overload damage. When the pressure sensor detects a small resistance (indicating soft strata or cavities), the controller will reduce the power of the cycloidal motor 2 or turn it off to save energy, reduce disturbance to the core and borehole wall, and improve the core quality. At the same time, it will increase the speed of the drive motor 5 to achieve rapid drilling.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this 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 be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A core drilling structure, characterized in that, include: Drill barrel; The vibration mechanism includes a cycloidal motor, an eccentric shaft, and at least one eccentric hammer. The output shaft of the cycloidal motor is connected to the eccentric shaft for transmission. The eccentric hammer is fixedly installed on the eccentric shaft. The eccentric shaft passes through the upper part of the drill barrel so that when the cycloidal motor drives the eccentric shaft to rotate, the eccentric hammer rotates with the eccentric shaft and drives the drill barrel to vibrate. The drive mechanism includes a drive motor and a gearbox. The output end of the drive motor is connected to the input end of the gearbox, and the output end of the gearbox is connected to the drill barrel, so that the drive motor drives the drill barrel to rotate around its own axis through the gearbox. The cycloidal motor and the drive motor are independently installed in the drill barrel. When the cycloidal motor stops working, the eccentric hammer rotates synchronously with the drill barrel.

2. The core drilling structure according to claim 1, characterized in that, There are two eccentric hammers, which are symmetrically arranged at both ends of the eccentric shaft.

3. The core drilling structure according to claim 2, characterized in that, The eccentric hammer has multiple sets of adjustment holes along the radial direction, and the bolt that can be selectively inserted through any one of the adjustment holes can be detachably connected to the eccentric shaft.

4. The core drilling structure according to claim 1, characterized in that, A lip-shaped sealing ring is fitted at the connection between the output shaft of the cycloidal motor and the eccentric shaft.

5. The core drilling structure according to claim 1, characterized in that, The connection end between the eccentric shaft and the drill barrel is provided with a buffer member. The buffer member is sleeved on the end of the eccentric shaft and sandwiched between the eccentric shaft and the inner wall of the drill barrel.

6. The core drilling structure according to claim 5, characterized in that, The buffer is made of nitrile rubber.

7. The core drilling structure according to claim 1, characterized in that, It also includes a control system, which includes: A pressure sensor, installed on the inner wall of the drill barrel, is used to detect the resistance between the drill barrel and the workpiece; The controller is electrically connected to the pressure sensor, the cycloidal motor, and the drive motor, respectively.

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