A recyclable protected layer expansion deformation testing device and a method of using the same

Abstract

The application relates to the technical field of protected layer measurement, and particularly relates to a recyclable protected layer expansion and deformation testing device and a practical method thereof, which comprises a telescopic protective sleeve, an inner tube body, a displacement sensor, and a pressure spring abutting between the telescopic protective sleeve and the displacement sensor, the telescopic protective sleeve is sleeved on an opening at one end of the inner tube body, the pressure spring and the displacement sensor are inserted into the inner tube body, and the inner side of the inner tube body is provided with a recycling mechanism which can be used for recycling the displacement sensor. The recycling mechanism adopts a pressing piece hinged to the inner wall of the inner tube body, the displacement sensor located in the inner tube body is pressed, the best fixing effect of the displacement sensor during measurement is achieved, the recycling traction line fixed to the pressing piece is pulled, the compression of the pressure spring is matched, the pressing piece is swung to release the pressing on the displacement sensor, the displacement sensor is detached to be recycled and reused, and the cost is reduced.

Description

[Technical Field]

[0002] This invention relates to the field of protected layer measurement technology, specifically a recyclable protected layer expansion deformation testing device and its usage method. [Background Technology]

[0004] Protective layer mining is the most effective and economical regional outburst prevention measure to date. Under the influence of protective layer mining, the gas pressure and gas content of the outburst-prone coal seam are significantly reduced, while the permeability of the coal seam is significantly enhanced, inducing the release of large amounts of high-pressure gas and thus eliminating the outburst risk. According to the requirements of the "Regulations on the Prevention and Control of Coal and Gas Outbursts," protective layer mining is a priority regional prevention measure. When an outburst-prone mine has the conditions for protective layer mining, it must be mined first. During the protective layer mining process, the protected layer will expand and deform. The expansion rate of the protected layer is an important indicator for assessing its mining performance. When the maximum expansion deformation of the protected layer exceeds 0.3%, the test and assessment results can be applied to the same protective layer and protected layer in other areas. Therefore, accurately measuring the coal seam expansion deformation is of great significance for protective layer mining.

[0005] Currently, most testing devices and methods for the expansion and deformation of protected coal seams employ the deep benchmark method. This involves drilling a borehole into the protected coal seam and fixing benchmarks near the top and bottom of the seam within the borehole. The relative displacement of the two benchmarks is then converted with the borehole angle to obtain the amount of expansion and deformation of the coal seam or the amount of separation between the top and bottom of the coal seam. Other methods include calculating the separation amount by recording the relative displacement of a steel wire rope scale and combining it with the borehole angle, and calculating the expansion rate of the protected coal seam by placing displacement sensors and combining them with the borehole angle. However, existing testing devices, typically using displacement sensors, while providing relatively accurate readings, are only suitable for measuring short distances of protected coal seams. Furthermore, these sensors are not reusable or can only be used for external fixing mechanisms, resulting in significant material waste of key components. Additionally, during protected coal seam testing in coal mines, the drilling distance is generally long, and unexpected situations often necessitate re-drilling. Therefore, the testing device must be able to be withdrawn and reinstalled as needed. Since the expansion and deformation of the protected coal seam is generally small, only a few millimeters, the device must possess reliable accuracy. Therefore, when multiple tests are required in actual coal mine conditions, there is an urgent need for a reusable, recyclable protective layer expansion deformation testing device that can be reused, thereby reducing costs. [Summary of the Invention]

[0007] The purpose of this invention is to provide a recyclable protective layer expansion deformation testing device and its usage method, solving the problem that the main components of existing protective layer expansion deformation testing devices cannot be recycled for reuse.

[0008] The present invention provides the following technical solution: a recyclable protective layer expansion deformation testing device, comprising a telescopic protective sleeve, an inner tube body, and a displacement sensor, and a pressure spring abutting between the telescopic protective sleeve and the displacement sensor. The telescopic protective sleeve is fitted onto an opening at one end of the inner tube body, allowing the pressure spring and the displacement sensor to extend into the inner tube body. A retrieval mechanism is provided on the inner side of the inner tube body. The retrieval mechanism includes a retrieval traction line and a pressing member hinged to the inner wall of the inner tube body. The pressing member presses against and fixes the displacement sensor on the other side opposite to the pressure spring. One end of the retrieval traction line is fixed to the pressing member. By pulling the other end of the retrieval traction line, the pressing member can be swung to release its pressure on and fix the displacement sensor.

[0009] As described above, a recyclable protective layer expansion deformation testing device includes a recycling mechanism comprising two sets of pressing members respectively hinged to opposite sides of the inner tube wall, the two sets of pressing members respectively pressing and fixing to the displacement sensor on both sides opposite to the pressure spring.

[0010] As described above, in a recyclable protective layer expansion deformation testing device, each of the pressing members has a hinge pin inserted through its hinged portion, and the pressing member is also connected to a receiving member, with the recycling traction line movably mounted on the receiving member.

[0011] The recyclable protective layer expansion deformation testing device described above further includes an outer tube body sleeved on the outside of the inner tube body. A fixing mechanism is provided on the outer wall of the outer tube body. The fixing mechanism includes a plurality of tube body protrusions distributed along the periphery of the outer wall of the outer tube body. The tube body protrusions are movably provided with hooks, and pins are connected between the hooks and the tube body protrusions.

[0012] As described above, in a recyclable protective layer expansion deformation testing device, a torsion spring is provided between the hook and the tube protrusion. The hook has a first slot, the tube protrusion has a second slot, the center of the torsion spring is fixed on the pin, and the two ends of the torsion spring abut against the first slot and the second slot, respectively.

[0013] The recyclable protective layer expansion deformation testing device described above further includes a propulsion mechanism, which includes a propulsion tube and a propulsion tube sleeve. One end of the propulsion tube sleeve is fitted onto the end of the propulsion tube, and the other end is detachably fitted around the hook, so that the hook is tightened to compress the torsion spring.

[0014] As described above, a recyclable protective layer expansion deformation testing device is provided with a traction mechanism on the outer wall of the inner tube. The traction mechanism includes a stud and a rope, and the rope is fastened to the outer wall of the inner tube through the stud.

[0015] In the recyclable protective layer expansion deformation testing device described above, the recycling traction line and the tether rope are set in opposite colors.

[0016] The recyclable protective layer expansion deformation testing device described above also includes an armored cable and a digital display, wherein the displacement sensor is electrically connected to the digital display via the armored cable.

[0017] The present invention also provides a method for using a recyclable protective layer expansion deformation testing device, comprising the following steps:

[0018] S1. Drill holes in the protected layer until they reach a depth of one meter in the coal seam.

[0019] S2. Insert the recyclable protective layer expansion deformation test device into the borehole until the telescopic protective sleeve reaches the test position.

[0020] S3. Remove the propulsion sleeve and propulsion tube, and pull the rope to confirm whether the hook is inserted into the hole wall;

[0021] S4. Obtain the data collected by the displacement sensor through the digital display, and convert the data with the drilling angle to obtain the data of the expansion deformation of the protected layer;

[0022] S5. After the measurement is completed, pull the traction line to release the pressure fixation of the displacement sensor, and take the displacement sensor out of the inner tube by pulling the armored cable.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] 1. The recycling mechanism of the present invention uses a pressing member hinged to the inner wall of the inner tube to press against the displacement sensor located inside the inner tube, so as to achieve the best fixing effect of the displacement sensor during measurement. Then, by pulling the recycling traction line fixed to the pressing member, and in conjunction with the compression of the pressure spring, the pressing member swings to release the pressure on the displacement sensor, so that the displacement sensor can be detached for recycling and reuse, thereby reducing costs.

[0025] 2. The recycling mechanism of the present invention adopts a propulsion mechanism, which can be used to load the outer tube and the inner tube and send the outer tube and the inner tube into a long-distance borehole. During the propulsion process, the hook will not open under the protection of the propulsion sleeve, thereby ensuring that the outer tube and the inner tube can smoothly enter the protected layer. After being pushed to the test position, the hook can pop out and lock onto the inner wall by withdrawing the propulsion sleeve, which is convenient and quick. [Attached Image Description]

[0027] Figure 1 This is a front perspective view of the recyclable protected layer expansion deformation testing device of the present invention;

[0028] Figure 2 This is a front perspective view of the recyclable protected layer expansion deformation testing device of the present invention after removing the propulsion mechanism.

[0029] Figure 3 A perspective view of the recyclable protected layer expansion deformation testing device of the present invention after removing the propulsion mechanism;

[0030] Figure 4 This is a schematic diagram of the fitting relationship between the inner tube and the outer tube in the recyclable protected layer expansion deformation testing device of the present invention;

[0031] Figure 5 This is a schematic diagram showing the connection relationship of the detection elements in the recyclable protected layer expansion deformation testing device of the present invention;

[0032] Figure 6 This is a partial perspective view of a single recovery mechanism in the recyclable protected layer expansion deformation testing device of the present invention;

[0033] Figure 7 This is a partial perspective view of a single fixing mechanism in the recyclable protected layer expansion deformation testing device of the present invention;

[0034] Figure 8 This is a schematic diagram of the structure of the first slot in the recyclable protected layer expansion deformation testing device of the present invention;

[0035] Figure 9 This is a perspective view of the propulsion mechanism in the recyclable protected layer expansion deformation testing device of the present invention;

[0036] Figure 10 This is a schematic diagram of the traction mechanism in the recyclable protected layer expansion deformation testing device of the present invention.

Detailed Implementation Methods

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present invention.

[0039] Example 1: Please refer to the appendix Figure 1 To be continued Figure 10This embodiment provides a recyclable protective layer expansion deformation testing device, including a telescopic protective sleeve 1, an inner tube 10, and a displacement sensor 3, as well as a pressure spring 2 abutting between the telescopic protective sleeve 1 and the displacement sensor 3. The telescopic protective sleeve 1 is fitted onto the opening at one end of the inner tube 10, allowing the pressure spring 2 and the displacement sensor 3 to extend into the inner tube 10. A retrieval mechanism is provided on the inner side of the inner tube 10. The retrieval mechanism includes a retrieval traction line 404 and a pressing member 401 hinged to the inner wall of the inner tube 10. The pressing member 401 presses and fixes against the other side of the displacement sensor 3 opposite to the pressure spring 2. One end of the retrieval traction line 404 is fixed to the pressing member 401. By pulling the other end of the retrieval traction line 404, the pressing member 401 can be driven to swing to release its pressure on the displacement sensor 3. The recycling mechanism provided in this embodiment uses a pressing member 401 hinged to the inner wall of the inner tube 10 to press against the displacement sensor 3 located inside the inner tube 10, so as to achieve the best fixing effect of the displacement sensor 3 during measurement. Then, by pulling the recycling traction line 404 fixed to the pressing member 401, and in conjunction with the compression of the pressure spring 2, the pressing member 401 swings to release the pressure on the displacement sensor 3, so that the displacement sensor 3 can be detached for recycling and reuse, thereby reducing costs.

[0040] The recovery mechanism includes two sets of pressing members 401, which are respectively hinged to opposite sides of the inner wall of the inner tube 10. The two sets of pressing members 401 are respectively pressed and fixed on both sides of the displacement sensor 3 opposite to the pressure spring 2. By using two sets of pressing members 401, the contact and fixation of the displacement sensor 3 is more secure, which greatly reduces the risk of the displacement sensor 3 accidentally falling off during operation.

[0041] Each pressing member 401 has a hinge pin 403 threaded through its hinged portion. The pressing member 401 is also connected to a receiving member 402, and the retrieval traction line 404 is movably mounted on the receiving member 402. Preferably, a fixed pulley is provided at the mounting point of the retrieval traction line 404 on the receiving member 402, which makes the pulling of the retrieval traction line smoother and less strenuous, and facilitates the tension and swinging of the pressing member 401.

[0042] The recyclable protective layer expansion deformation testing device also includes an outer tube 9 sleeved outside the inner tube 10. A fixing mechanism is provided on the outer wall of the outer tube 9. The fixing mechanism includes several tube protrusions 801 distributed along the periphery of the outer wall of the outer tube 9. Hooks 802 are movably mounted on the tube protrusions 801, and pins 803 are inserted between the hooks 802 and the tube protrusions 801. During drilling, the hooks 802 will engage with the borehole wall, thus fixing the outer tube 9 inside the borehole.

[0043] A torsion spring 804 is also provided between the hook 802 and the tube protrusion 801. The hook 802 has a first slot 805, and the tube protrusion 801 has a second slot 806. The center of the torsion spring 804 is fixed to the pin 803, and the two ends of the torsion spring 804 abut against the first slot 805 and the second slot 806, respectively. When the hook 802 is in a tightened state before opening, the torsion spring 804 is compressed. After the tightening restriction is released, the hook 802 opens in the hole wall under the action of the torsion spring 804, and can be more firmly locked in the hole.

[0044] The recyclable protected layer expansion deformation testing device also includes a propulsion mechanism, which includes a propulsion tube 1102 and a propulsion tube sleeve 1101. One end of the propulsion tube sleeve 1101 is fitted onto the end of the propulsion tube 1102, and the other end is detachably fitted around a hook 802, so that the hook 802 is tightened to compress the torsion spring 804. At this time, the hook 802 is in a tightened state and can enter the borehole with the propulsion mechanism without opening until the propulsion tube sleeve 1101 exits and is freed from the enclosure of the hook 802, at which point the hook 802 will open.

[0045] A traction mechanism 5 is provided on the outer wall of the inner tube 10. The traction mechanism 5 includes a stud 501 and a rope 502. The rope 502 is fastened to the outer wall of the inner tube 10 by the stud 501. Preferably, the traction line 404 and the rope 502 are different colors for easy differentiation.

[0046] Furthermore, preferably, both the inner tube 10 and the outer tube 9 are made of biodegradable materials, which greatly reduces the environmental pollution caused by the inner tube 10 and the outer tube 9 left in the borehole after the displacement sensor 3 is recovered.

[0047] The recyclable protective layer expansion deformation testing device also includes an armored cable 6 and a digital display 7. The displacement sensor 3 is electrically connected to the digital display 7 via the armored cable 6. Preferably, the displacement sensor 3, the armored cable 6, and the digital display 7 are all intrinsically safe, making the testing operation safer.

[0048] This embodiment also discloses a method for using the recyclable protected layer expansion deformation testing device, the steps of which are as follows:

[0049] S1. Drill holes in the protected layer until you reach a depth of about one meter in the coal seam.

[0050] S2. Insert the recyclable protective layer expansion deformation test device into the borehole until the telescopic protective sleeve 1 reaches the test position.

[0051] S3. Remove the propulsion sleeve 1101 and propulsion tube 1102, and pull the tether rope 502 to confirm whether the hook 802 is inserted into the hole wall.

[0052] S4. Obtain the data collected by the displacement sensor 3 through the digital display 7, and convert the data with the drilling angle to obtain the data of the expansion deformation of the protected layer;

[0053] S5. After the measurement is completed, pull the traction line 404 to release the pressure fixation of the displacement sensor 3, and take the displacement sensor 3 out of the inner tube 10 by pulling the armored cable 6.

[0054] In the usage method of the recyclable protected layer expansion deformation testing device provided in this embodiment, the recycling mechanism uses a pressing member 401 hinged to the inner wall of the inner tube 10 to press the displacement sensor 3 located inside the inner tube 10, so as to achieve the best fixing effect of the displacement sensor 3 during measurement. Then, by pulling the recycling traction line 404 fixed to the pressing member 401, and in conjunction with the compression of the pressure spring 2, the pressing member 401 swings to release the pressure on the displacement sensor 3, so that the displacement sensor 3 can be detached for recycling and reuse, thereby reducing costs.

[0055] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A recyclable protective layer expansion deformation testing device, characterized in that: The device includes a telescopic protective sleeve (1), an inner tube (10), and a displacement sensor (3), as well as a pressure spring (2) abutting between the telescopic protective sleeve (1) and the displacement sensor (3). The telescopic protective sleeve (1) is fitted onto the opening at one end of the inner tube (10), allowing the pressure spring (2) and the displacement sensor (3) to extend into the inner tube (10). The inner tube (10) is provided with a retrieval mechanism, which includes a retrieval traction line (404) and a pressing member (401) hinged to the inner wall of the inner tube (10). The pressing member (401) is pressed and fixed against the other side of the displacement sensor (3) opposite to the pressure spring (2). One end of the retrieval traction line (404) is fixed to the pressing member (401). By pulling the other end of the retrieval traction line (404), the pressing member (401) can be driven to swing to release its pressure on the displacement sensor (3).

2. The recyclable protective layer expansion deformation testing device according to claim 1, characterized in that: The recycling mechanism includes two sets of pressing members (401) respectively hinged to opposite sides of the inner wall of the inner tube (10), and the two sets of pressing members (401) respectively press against and are fixed on both sides of the displacement sensor (3) opposite to the pressure spring (2).

3. The recyclable protective layer expansion deformation testing device according to claim 2, characterized in that: Each of the pressing members (401) has a hinge pin (403) inserted through its hinge portion. The pressing member (401) is also connected to a receiving member (402). The recovery traction line (404) is movably mounted on the receiving member (402).

4. The recyclable protective layer expansion deformation testing device according to claim 1, characterized in that: It also includes an outer tube (9) sleeved on the outside of the inner tube (10). The outer tube (9) has a fixing mechanism on its outer wall. The fixing mechanism includes a plurality of tube protrusions (801) distributed along the periphery of the outer tube wall of the outer tube (9). The tube protrusions (801) are movably provided with hooks (802). A pin (803) is connected between the hooks (802) and the tube protrusions (801).

5. The recyclable protective layer expansion deformation testing device according to claim 4, characterized in that: A torsion spring (804) is also provided between the hook (802) and the tube body protrusion (801). The hook (802) is provided with a first slot (805), and the tube body protrusion (801) is provided with a second slot (806). The center of the torsion spring (804) is fixed on the pin (803), and the two ends of the torsion spring (804) abut against the first slot (805) and the second slot (806) respectively.

6. The recyclable protective layer expansion deformation testing device according to claim 5, characterized in that: It also includes a propulsion mechanism, which includes a propulsion tube (1102) and a propulsion tube sleeve (1101). One end of the propulsion tube sleeve (1101) is fitted onto the end of the propulsion tube (1102), and the other end is detachably fitted around the hook (802) so that the hook (802) is tightened to compress the torsion spring (804).

7. The recyclable protective layer expansion deformation testing device according to claim 1, characterized in that: The outer wall of the inner tube (10) is provided with a traction mechanism (5), which includes a stud (501) and a rope (502). The rope (502) is attached to the outer wall of the inner tube (10) through the stud (501).

8. The recyclable protective layer expansion deformation testing device according to claim 7, characterized in that: The recovery traction line (404) and the tether rope (502) are set in different colors.

9. The recyclable protective layer expansion deformation testing device according to claim 1, characterized in that: It also includes an armored cable (6) and a digital display (7), wherein the displacement sensor (3) is electrically connected to the digital display (7) via the armored cable (6).

10. A method of using the recyclable protected layer expansion deformation testing device as described in claim 1, characterized in that, Includes the following steps: S1. Drill holes in the protected layer until they reach a depth of one meter in the coal seam. S2. Insert the recyclable protective layer expansion deformation test device into the borehole until the telescopic protective sleeve (1) reaches the test position; S3. Remove the propulsion sleeve (1101) and propulsion tube (1102), and pull the tether rope (502) to confirm whether the hook (802) is inserted into the hole wall; S4. Obtain the data collected by the displacement sensor (3) through the digital display (7), and convert the data with the drilling angle to obtain the data of the expansion deformation of the protected layer; S5. After the measurement is completed, pull the traction line (404) to release the pressure fixation of the displacement sensor (3), and take the displacement sensor (3) out of the inner tube (10) by pulling the armored cable (6).

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