Rock core marking device
By using an installation cylinder and graduated tape in the core marking device, the problem of chaotic and incorrect core sequence caused by non-standard drilling operations was solved, enabling rapid marking of core sequence and accurate estimation of length, thus improving the accuracy of basic geological data.
Patent Information
- Application Number
- CN202511964605.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-24
- Publication Date
- 2026-02-03
AI Technical Summary
In field geological exploration, improper drilling operations can lead to disordered and incorrect core sequence, increase the time required for core marking, and affect the accuracy of stratigraphic division and rock quality index RQD value.
Design a core marking device, including an installation cylinder, a rubber guide plate, and a graduated tape. By marking the core simultaneously as it falls out, the rubber guide plate guides the core to fall along the central axis of the drill pipe, and the graduated tape is used to attach the core to the drill pipe, thus achieving rapid marking and length estimation.
It effectively solved the problems of disordered and incorrect core sequence, simplified the field core marking process, and improved the accuracy of core length recording and the real-time reflection of rock quality index RQD value.
Smart Images
Figure CN121451868A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of core marking technology, and specifically relates to a core marking device. Background Technology
[0002] Currently, field geological exploration involves drilling to obtain rock cores for basic geological work such as geological logging and stratigraphic division. However, in the actual process of obtaining rock cores, there are instances where drillers do not operate according to specifications and procedures.
[0003] When drilling through rock formations, the starting depth for each run is determined based on rock type, core recovery rate, and other requirements. The depth per run is generally controlled between 1m and 2m. However, in actual drilling operations, workers often prioritize convenience and do not adhere to the specified depth control, typically drilling beyond 3m. Furthermore, they often handle core samples roughly, without segmenting them, and cause the cores to slip and fall freely by striking the core tube, resulting in confusion and errors in the core sequence. These errors have serious consequences, leading to incorrect stratigraphic division and inaccurate geological data. In addition, the calculation of core recovery rate and rock quality index (RQD) values during field drilling currently depends not only on the standardization of the worker's core extraction operation but also on the significant time spent on marking the cores in the field, increasing workload. Summary of the Invention
[0004] The present invention aims to provide a core marking device that marks the core simultaneously during extraction, reducing the core marking time in the field and solving the problem of disorder and errors in the core sequence caused by non-standard operation by workers when extracting cores.
[0005] Therefore, the technical solution adopted by the present invention is as follows: a core marking device, comprising an installation cylinder fitted on the bottom end of a drill rod, wherein the bottom end of the installation cylinder is provided with an inwardly inclined rubber guide plate, thereby causing the core to fall out along the central axis of the drill rod; the bottom end of the installation cylinder is provided with a tape mounting shell and a graduated tape rotatably installed in the tape mounting shell; the tape mounting shell is provided with an adhesive notch on the side facing the core for the starting end of the graduated tape to extend out, and an adhesive tape installation and removal notch on the side away from the core for installing and removing the graduated tape; the bottom of the tape mounting shell is provided with an adhesive support foot that abuts against the core inward; when the core is shaken out of the drill rod, the starting end of the graduated tape is adhered to the core, and is tightly adhered to the core by the adhesive support foot.
[0006] As a preferred embodiment of the above scheme, the rubber guide plate consists of three pieces bonded together at 90° intervals around the lower edge of the mounting cylinder. The adhesive support foot is spaced 90° apart from the adjacent rubber guide plate. The bottom ends of the rubber guide plate and the adhesive support foot are both arc-shaped structures that fit the rock core, thereby squeezing the rock core inward and causing it to fall along the central axis of the drill rod. The structural design is reasonable.
[0007] More preferably, the graduated tape is connected to the tape mounting shell by a pin. The tape mounting shell is made of metal, and the adhesive feet are made of rubber and are bonded to the lower edge of the tape mounting shell. The materials are reasonably selected, and the bonding is convenient and firm.
[0008] A further preferred embodiment is that the unfolded length of the graduated tape is 4m, and the smallest graduation is 1cm, while the length of the surrounding rock is generally 3.3m, which meets the length requirement.
[0009] Preferably, the mounting cylinder is made of metal and has an internal thread at the top that matches the thread on the bottom of the drill rod, thus enabling threaded connection with the drill rod and making installation simple and convenient.
[0010] More preferably, the upper part of the tape mounting shell is provided with an arc-shaped mounting surface that fits the outer wall of the mounting cylinder, and is installed at the bottom end of the mounting cylinder by welding, so as to ensure a firm connection.
[0011] The beneficial effects of this invention are:
[0012] (1) Compared with the chaos and errors in the core sequence caused by non-standard operation when workers take cores, this solution uses a core marking device to add core marking device during core taking. Even if there is rough operation, non-segmented extraction, or core dropping or falling due to knocking on the core tube, the core sequence can be quickly clarified by the scale tape pasted on the core. The core length can also be roughly estimated by the size on the scale tape. The operation is convenient and simple.
[0013] (2) The tape mounting shell has an adhesive notch on the side facing the rock core, which makes it easy for the starting end of the tape to extend and contact the rock core. It also leaves enough space for cutting the tape with a knife or scissors. The tape installation and removal notch is provided on the side away from the rock core, which makes it easy to install and remove the tape. When a rock core is removed, the tape needs to be replaced. The structure is reasonably designed.
[0014] (3) The bottom of the installation cylinder is provided with an inwardly inclined rubber guide plate, which squeezes the rock core inward and makes the rock core fall in the center along the central axis of the drill rod, avoiding the rock core from shaking and rotating inside the drill rod when it falls, ensuring that the scale tape is pasted without being crooked, effectively reducing the error in the recorded rock core length dimension. The structure is reasonably designed. The bottom of the tape placement shell is provided with adhesive feet. The adhesive feet press against the rock core inward to ensure that the scale tape is pasted in place. The concept is novel and the design is ingenious.
[0015] (4) This solution marks and identifies the rock core at the moment it emerges from the drill pipe by attaching graduated tape. The information marking and identification of the rock core is achieved from the moment it exits the drill pipe. For example, the sequence of rock cores can be marked by this device, which can avoid the inaccuracy of basic geological data caused by human error. Furthermore, the rock core recovery rate and rock quality index RQD value can be reflected immediately by marking the length of the rock core.
[0016] In summary, this invention has the advantages of quickly clarifying the core sequence, estimating the core length, and immediately reflecting the core quality index RQD value. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the structure of the present invention.
[0018] Figure 2 for Figure 1 Top view. Detailed Implementation
[0019] The present invention will be further described below with reference to the embodiments and accompanying drawings:
[0020] Combination Figure 1 — Figure 2 As shown, a core marking device consists of an installation cylinder 2 fitted onto the bottom end of a drill rod 1.
[0021] The mounting cylinder 2 is preferably made of metal, and its top is provided with an internal thread that matches the thread on the bottom of the drill rod 1, so as to be threadedly connected to the drill rod 1.
[0022] The bottom of the mounting cylinder 2 is provided with an inwardly inclined rubber guide plate 3, which allows the rock core 4 to fall out along the central axis of the drill rod 1.
[0023] The bottom of the mounting cylinder 2 is equipped with a tape holder 5 and a graduated tape 6 that can be rotatably installed inside the tape holder 5.
[0024] The tape mounting shell 5 is preferably made of metal.
[0025] The tape mounting shell 5 has an adhesive notch 51 on the side facing the rock core 4 for the starting end of the scale tape 6 to extend out, and a tape installation and removal notch 52 on the side away from the rock core 4 for installing and removing the scale tape 6.
[0026] The bottom of the tape mounting shell 5 is provided with adhesive support feet 53 that press inward against the rock core 4.
[0027] The rubber guide plate 3 consists of three pieces bonded together at 90° intervals around the lower edge of the mounting cylinder 2.
[0028] The adhesive support foot 53 is spaced 90° apart from the adjacent rubber guide piece 3.
[0029] The adhesive support 53 is preferably made of rubber and is bonded to the lower edge of the tape mounting shell 5.
[0030] The bottom ends of the rubber guide plate 3 and the adhesive support foot 53 are both arc-shaped structures that fit into the rock core 4.
[0031] The tape mounting shell 5 has an arc-shaped mounting surface on its upper part that fits with the outer wall of the mounting cylinder 2, and is installed at the bottom of the mounting cylinder 2 by welding.
[0032] The graduated tape 6 is connected to the tape mounting shell 5 by a pin.
[0033] The graduated tape 6 has an unfolded length of 4m and a minimum graduation of 1cm.
[0034] When the core 4 is shaken out of the drill rod 1, the starting end of the graduated tape 6 is attached to the core 4 and is pressed tightly onto the core 4 by the adhesive support foot 53.
[0035] The specific implementation steps are as follows: After removing the drill rod and drill bit, thread the device onto the lower end of the drill rod. First, tilt the device to allow part of the rock core to fall out. Then, manually attach the initial end of the graduated tape 6 to the first end of the rock core. Then, lift the drill rod to allow the rock core to continue falling out. Use the adhesive support 53 to attach the graduated tape 6 to the rock core wall. When the rock core has completely fallen out, there is usually some tape remaining. Then, manually cut the graduated tape with scissors or a knife and remove the device.
[0036] When performing the next core extraction, replace the tape with a new graduated tape 6.
Claims
1. A core marking device, characterized in that: The system includes an installation cylinder (2) fitted onto the bottom end of the drill rod (1). The bottom end of the installation cylinder (2) is provided with an inwardly inclined rubber guide plate (3) so that the core (4) falls out along the central axis of the drill rod (1). The bottom end of the installation cylinder (2) is equipped with a tape mounting shell (5) and a graduated tape (6) that can be rotatably installed inside the tape mounting shell (5). The tape mounting shell (5) has a side facing the core (4) for the graduated tape (6) to be adhered. The adhesive notch (51) extending from the starting end has a tape installation and removal notch (52) on the side away from the core (4) for installing and removing the graduated tape (6). The tape mounting shell (5) has an adhesive support foot (53) at the bottom that presses against the core (4) inward. When the core (4) is shaken out of the drill rod (1), the starting end of the graduated tape (6) is pasted on the core (4) and is pressed tightly onto the core (4) by the adhesive support foot (53).
2. The core marking device according to claim 1, characterized in that: The rubber guide plate (3) is made of three pieces bonded to the lower edge of the mounting cylinder (2) at a 90° interval. The adhesive support foot (53) is 90° apart from the adjacent rubber guide plate (3). The bottom ends of the rubber guide plate (3) and the adhesive support foot (53) are both arc-shaped structures that fit with the rock core (4).
3. The core marking device according to claim 1, characterized in that: The graduated tape (6) is connected to the tape mounting shell (5) by a pin. The tape mounting shell (5) is made of metal, and the adhesive support foot (53) is made of rubber and is bonded to the lower edge of the tape mounting shell (5).
4. The core marking device according to claim 1, characterized in that: The graduated tape (6) has an unfolded length of 4m and a minimum graduation of 1cm.
5. A core marking device according to claim 1, characterized in that: The mounting cylinder (2) is made of metal and has an internal thread at the top that matches the thread at the bottom of the drill rod (1), so as to be threadedly connected to the drill rod (1).
6. A core marking device according to claim 1, characterized in that: The tape mounting shell (5) has an arc-shaped mounting surface on its upper part that fits with the outer wall of the mounting cylinder (2), and is installed at the bottom of the mounting cylinder (2) by welding.