Gas extraction drill hole plugging body compactness detection device

Abstract

The utility model discloses a gas extraction borehole plugging body compactness detection device, which relates to the technical field of compactness detection, and comprises a detection rod, a pressing plate, a nut, an acceleration sensor, a force hammer and a nondestructive detector, the edge of the pressing plate is fixedly connected to a detection surface through an anchor rod, the detection rod penetrates through a detection hole in the pressing plate, and the nut is arranged on the detection rod. The inner end of the detection rod makes contact with the outer bag plugging body, the outer end of the detection rod is connected with an acceleration sensor, the force hammer is used for knocking the outer end of the detection rod, and the acceleration sensor and the force hammer are in communication connection with the nondestructive detector. The device is reasonable in structure and simple to operate, the compactness of the plugging body is obtained by utilizing a nondestructive testing principle on the basis of not damaging the gas extraction hole sealing, the detection cost is greatly reduced, the detection efficiency is improved, and the device is convenient for operators to use.

Description

Technical Field

[0001] The utility model relates to the technical field of density detection, in particular to a density detection device for a gas extraction borehole plugging body. Background Art

[0002] The density of the gas extraction borehole seals in coal mines is a key factor affecting gas extraction and sudden gas outburst mitigation, and plays a crucial role in coal mine safety production. The gas extraction process includes three steps: drilling, sealing, and extraction, and the quality of the seals significantly impacts the extraction results. Sealing is typically done with bags at both ends and cement or polyurethane in the middle. The density of the seals not only affects extraction efficiency and production progress, but also poses a threat to life and property safety. Therefore, a detection device is needed to test the density of gas extraction borehole seals.

[0003] Currently, the density of gas extraction borehole seals is typically tested by injecting downhole pressurized air into the borehole and observing pressure changes to determine the borehole's density. Others have proposed inserting a probe tube into the borehole to determine density by measuring gas concentrations at different locations within the borehole and the negative pressure of the extraction. However, these methods are complex and less scientific, making it difficult to intuitively and accurately determine the sealing effect. If the sealing effect is poor, it is difficult to identify the leak point, making a second sealing attempt impossible. Utility Model Content

[0004] The purpose of the utility model is to provide a gas extraction borehole sealing body density detection device to solve the problems existing in the above-mentioned prior art, so that the detection of the density of the borehole sealing body is scientific and accurate, and the sealing effect and leakage point can be accurately judged.

[0005] To achieve the above purpose, the present invention provides the following solutions:

[0006] The utility model provides a gas extraction borehole sealing body density detection device, including a detection rod, a pressure plate, an acceleration sensor, a force hammer and a non-destructive testing instrument, the edge of the pressure plate is fixedly connected to the detection surface by an anchor rod, the detection rod passes through the detection hole on the pressure plate and is inserted into the borehole, the inner end of the detection rod is in contact with the outer bag sealing body, and the outer end is connected to the acceleration sensor, the force hammer is used to knock the outer end of the detection rod, and the acceleration sensor and the force hammer are communicatively connected to the non-destructive testing instrument.

[0007] Preferably, the detection rod includes a touch rod, an extension rod and an excitation receiving rod which are sequentially connected by threads, the front end of the touch rod is a cone and is in point contact with the outer bag, and the outer diameters of the touch rod, the extension rod and the excitation receiving rod are equal.

[0008] Preferably, the outer diameters of the contact rod, the extension rod and the excitation receiving rod are all φ36 mm, and the front ends of the extension rod and the excitation receiving rod are both set as φ20 mm studs.

[0009] Preferably, the length of the touch rod is 1 m, the length of the extension rod is 0.5 m-2 m, and the length of the excitation receiving rod is 0.8 m.

[0010] Preferably, the surface of the excitation receiving rod is provided with an external thread, and the external thread is used to connect a nut, and the nut is fitted into the pressure plate.

[0011] Preferably, the length of the pressing plate is at least greater than the diameter of one of the drill holes, and the detection hole covers at least two of the drill holes.

[0012] Preferably, the width of the pressing plate is 10 cm and the thickness is 10 mm, and the material of the pressing plate includes steel plate.

[0013] Preferably, anchor rod fixing holes are provided on both sides of the pressure plate, and the detection hole is provided in the middle, and both the anchor rod fixing holes and the detection hole are rectangular long holes and are vertically oriented.

[0014] Preferably, the rectangular long hole has a length of 6 cm and a width of 38 mm, and there is at least one detection hole.

[0015] Preferably, the outer end of the anchor rod is connected to a nut, and the nut is located on the outer side of the pressure plate and can fix the pressure plate.

[0016] Compared with the prior art, the utility model has achieved the following technical effects:

[0017] The utility model has a reasonable structure and is easy to operate. On the basis of not destroying the gas extraction sealing hole, it uses the principle of non-destructive testing to obtain the density of the sealing body, which greatly reduces the testing cost, improves the testing efficiency, and is convenient for operators to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is a diagram showing the structure of a gas extraction borehole plugging body compactness detection device in an embodiment of the present utility model;

[0020] Figure 2 This is a structural diagram of the explosion structure of the detection rod in the embodiment of the utility model;

[0021] Figure 3 This is a schematic structural diagram of a pressure plate in an embodiment of the present utility model;

[0022] In the figure: 1-detection rod, 101-touch rod, 102-extension rod, 103-excitation receiving rod, 2-acceleration sensor, 3-hammer, 4-pressure plate, 41-anchor rod fixing hole, 42-detection hole, 5-nut, 6-anchor rod, 7-inner bag sealing body, 8-outer bag sealing body, 9-inter-bag sealing body, 10-non-destructive testing instrument. DETAILED DESCRIPTION

[0023] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] The purpose of the utility model is to provide a gas extraction borehole sealing body density detection device to solve the problems existing in the prior art, make the borehole sealing body density detection scientific and accurate, and accurately judge the sealing effect and leakage point.

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0026] Example 1

[0027] like Figures 1 to 3 As shown, in this embodiment, a gas extraction borehole sealing body density detection device is provided, comprising a detection rod 1, a pressure plate 4, an acceleration sensor 2, a force hammer 3 and a non-destructive testing instrument 10. The edge of the pressure plate 4 is fixedly connected to the detection surface by an anchor rod 6. The detection rod 1 passes through the detection hole on the pressure plate 4 and is inserted into the borehole. The inner end of the detection rod 1 is in contact with the outer bag sealing body, and the outer end is connected to the acceleration sensor 2. The force hammer 3 is used to strike the outer end of the detection rod 1. The acceleration sensor 2 and the force hammer 3 are communicatively connected to the non-destructive testing instrument 10. In this embodiment, the acceleration sensor 2 is connected to the non-destructive testing instrument 10 via a signal transmission data cable. Using the principle of non-destructive testing, the non-destructive testing instrument 10 derives the density of the sealing body based on the automatic analysis of professionals and the system.

[0028] As an optional solution, the detection rod 1 in this embodiment includes a feeler rod 101, an extension rod 102, and an excitation receiving rod 103, which are sequentially connected by threads. The front end of the feeler rod 101 is conical and essentially makes point contact with the outer bag. The outer diameters of the feeler rod 101, the extension rod 102, and the excitation receiving rod 103 are all equal. If a significant change in resistance is sensed during the movement of the feeler rod 101, it means that the point contact location has been found. If, under increased pressure, the object or surface being touched is susceptible to significant deformation (such as a soft bag), and the operator still senses that the contact point is in the same position and the contact area has not increased significantly, this also means that the point contact location has been found. When the tip of the cone contacts the outer bag, the contact area is minimized, allowing for a higher pressure or force to be concentrated at the contact point, making it suitable for applications requiring precise positioning or force application. Due to the small contact area, point contact can more sensitively sense vibrations or other subtle changes in the outer bag, making it suitable for precision measurement or detection applications. The local deformation of the outer bag is smaller when it is subjected to point contact, which is conducive to maintaining the integrity of the structure; when gently sliding on the contact surface, point contact will produce a local and obvious friction feeling, while the friction feeling of surface contact will be more uniform.

[0029] As an optional solution, in this embodiment, the outer diameters of the touch rod 101, the extension rod 102 and the excitation receiving rod 103 are all φ36 mm, and the front ends of the extension rod 102 and the excitation receiving rod 103 are both set as φ20 mm studs.

[0030] As an optional solution, in this embodiment, the length of the feeler rod 101 is 1 meter, the length of the extension rod 102 is 0.5-2 meters, and the length of the excitation receiving rod 103 is 0.8 meters. Generally, during use, both the feeler rod 101 and the extension rod 102 are driven into the blocking body located in the drilled hole, so that the front end of the feeler rod 101 forms a cone and makes point contact with the outer bag.

[0031] As an optional solution, in this embodiment, the surface of the excitation receiving rod 103 is provided with an external thread, which is used to connect the nut 5, and the nut 5 is in contact with the pressure plate 4. When the excitation hammer strikes the outer end of the excitation receiving rod 103, a stress wave signal is generated. The acceleration sensor 2 is magnetically attracted to the outer end of the excitation receiving rod 103 to receive the signal.

[0032] As an optional solution, in this embodiment, the length of the pressing plate 4 is at least greater than the diameter of one drill hole, and the detection hole covers at least one drill hole.

[0033] As an optional solution, in this embodiment, the width of the pressing plate 4 is 10 cm and the thickness is 10 mm. The material of the pressing plate 4 includes but is not limited to steel plate.

[0034] As an optional solution, in this embodiment, anchor rod 6 fixing holes are set on both sides of the pressure plate 4 and a detection hole is set in the middle. The anchor rod 6 fixing holes and the detection holes are both rectangular long holes and are perpendicular to each other, which is convenient for adjusting the position of the pressure plate 4 according to the distance between the drilled hole and the adjacent anchor rod 6, so as to better fix the detection rod.

[0035] As an optional solution, the rectangular slot in this embodiment is 6 cm long and 38 mm wide, and at least one detection hole is provided. In this embodiment, both the detection hole and the fixing hole have sufficient length and are adjustable, so only one detection point is required. Preferably, one detection hole is provided. During operation, several detection devices can be installed simultaneously and tested sequentially. Alternatively, one detection device can be used, disassembled, and then installed at another detection point for further testing.

[0036] As an optional solution, in this embodiment, the outer end of the anchor rod 6 is connected to a nut 5 , and the nut 5 is located outside the pressing plate 4 and can fix the pressing plate 4 .

[0037] Example 2

[0038] The specific use method and working principle of the gas extraction borehole sealing body density detection device in this embodiment are as follows:

[0039] The gas extraction borehole adopts the "two blocking and one injection" sealing process. Taking the uphole sealing as an example, after the grouting is completed, the inner bag sealing body 7, the outer bag sealing body 8 and the inter-bag sealing body 9 are formed in the borehole. In order to detect the density of the sealing body, the length of the detection rod 1 is first determined according to the position of the outer bag blocking body 8. In this embodiment, the distance between the outer bag and the outermost end of the borehole is 2m, so the detection rod 1 needs to use an extension rod 102 to assemble the detection rod 1. The touch rod 101, the extension rod 102, and the excitation receiving rod 103 are fixedly connected by threads. The pressure plate 4 is installed. The left long slit of the pressure plate 4 passes through the borehole adjacent to the left anchor rod 6, and the right long slit of the pressure plate 4 passes through the borehole adjacent to the right anchor rod 6. Then the detection rod 1 is passed through the middle long slit of the pressure plate 4, and the anchor rod 6 and the detection rod 1 are tightened with a nut 5 to ensure that the cone at the front end of the detection rod 1 is in point contact with the outer bag. A magnetic acceleration sensor 2 is attached to the exposed end of the detection rod 1, and a hammer 3 is used to knock the exposed end of the detection rod 1. The non-destructive testing instrument 10 collects the signal. After the technicians and the non-destructive testing instrument 10 process the signal, the density of the gas drilling hole sealing is obtained.

[0040] The acceleration sensor 2, the hammer 3 and the non-destructive testing instrument 10 are connected via a signal transmission data line. When the hammer 3 strikes the outer end of the detection rod 1 and the outer end of the exciting receiving rod 103, a stress wave signal is generated. The acceleration sensor 2 is magnetically adsorbed on the outer end of the exciting receiving rod 103 to receive the signal. The propagation characteristics of sound waves in the borehole sealing body are used to detect defects inside the borehole sealing body. When the sound waves encounter defects (cracks, cavities) in the borehole sealing body, reflection, refraction and scattering phenomena will occur. By receiving the reflected sound wave signal, it can be determined whether there are defects inside the borehole sealing body. Using the principle of non-destructive testing, the non-destructive testing instrument derives the density of the sealing body based on professional personnel and automatic analysis of the system.

[0041] This utility model uses specific examples to illustrate the principles and implementation methods of this utility model. The above examples are only intended to help understand the method and core concept of this utility model. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of this utility model. In summary, the contents of this specification should not be construed as limiting the present utility model.

Claims

1. A gas extraction borehole plugging body density detection device, characterized by: It includes a detection rod, a pressure plate, an acceleration sensor, a force hammer and a non-destructive testing instrument. The edge of the pressure plate is fixedly connected to the detection surface by an anchor rod. The detection rod passes through the detection hole on the pressure plate and is inserted into the drilled hole. The inner end of the detection rod is in contact with the outer bag sealing body, and the outer end is connected to the acceleration sensor. The force hammer is used to strike the outer end of the detection rod. The acceleration sensor and the force hammer are communicatively connected to the non-destructive testing instrument.

2. The gas extraction borehole sealing body density detection device according to claim 1, characterized in that: The detection rod includes a touch rod, an extension rod and an excitation receiving rod which are connected in sequence by threads. The front end of the touch rod is a cone and is in point contact with the outer bag. The outer diameters of the touch rod, the extension rod and the excitation receiving rod are all equal.

3. The gas extraction borehole sealing body density detection device according to claim 2, characterized in that: The outer diameters of the contact rod, the extension rod and the excitation receiving rod are all φ36 mm, and the front ends of the extension rod and the excitation receiving rod are both set as φ20 mm studs.

4. The gas extraction borehole sealing body density detection device according to claim 2, characterized in that: The length of the touch rod is 1 m, the length of the extension rod is 0.5 m-2 m, and the length of the excitation receiving rod is 0.8 m.

5. The gas extraction borehole sealing body density detection device according to claim 2, characterized in that: The surface of the excitation receiving rod is provided with an external thread, and the external thread is used to connect a nut, and the nut is fitted on the pressure plate.

6. The gas extraction borehole sealing body density detection device according to claim 1, characterized in that: The length of the pressing plate is at least greater than the diameter of one of the drill holes, and the detection hole covers at least two of the drill holes.

7. The gas extraction borehole sealing body density detection device according to claim 1, characterized in that: The pressing plate has a width of 10 cm and a thickness of 10 mm, and is made of a steel plate.

8. The gas extraction borehole sealing body density detection device according to claim 1, characterized in that: Anchor rod fixing holes are provided on both sides of the pressure plate, and the detection hole is provided in the middle. The anchor rod fixing holes and the detection hole are both rectangular long holes and are perpendicular to each other.

9. The gas extraction borehole sealing body density detection device according to claim 8, characterized in that: The length of the rectangular long hole is 6 cm and the width is 38 mm, and there is at least one detection hole.

10. The gas extraction borehole sealing body density detection device according to claim 1, characterized in that: The outer end of the anchor rod is connected with a nut, and the nut is located outside the pressing plate and can fix the pressing plate.

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