An inflatable dry-hole sonic testing probe

Abstract

The application relates to an inflatable dry-hole sonic testing probe. The probe comprises a sonic probe assembly and a water reservoir arranged in sequence along the front-back direction and detachably connected, the sonic probe assembly comprises a vibration pickup assembly, a first plug and a second plug arranged at the two ends of the vibration pickup assembly respectively, and a water storage bag sleeved outside the vibration pickup assembly, the water reservoir comprises a water reservoir shell, a hollow shaft rod fixedly arranged in the water reservoir shell, and an inflatable air bag sleeved outside the hollow shaft rod, a water storage space is formed between the inflatable air bag and the water reservoir shell, a water inlet communicating with the water storage space and an inflation port communicating with the inflatable air bag are arranged at the front and back ends of the water reservoir shell respectively, and the water inlet is in sealed communication with the water storage bag. The water reservoir and the water storage bag are in communication with each other, water can be injected into the water storage bag by inflating the inflatable air bag, and after the test is completed, the water is recovered to the water storage space, so that the probe can be suitable for drilling test work in all directions.

Description

Technical Field

[0001] This invention relates to the technical field of geophysical exploration borehole acoustic wave testing equipment, specifically to an inflatable dry borehole acoustic wave testing probe. Background Technology

[0002] Currently, borehole exploration is frequently used in engineering geological surveys, resulting in a significant workload for in-hole acoustic testing. Acoustic testing presents several challenges: In boreholes, the vibrator is fully coupled with water to the borehole wall. However, in inclined or horizontal boreholes, water is difficult to retain. In some downward-inclined and vertical boreholes, the rock mass is fractured, and water is often absent, making it impossible to complete in-hole acoustic testing.

[0003] Currently available acoustic dry hole testing probes typically have three signal lines: one connecting to the ultrasonic transmitting probe, and the other two connecting to two ultrasonic receiving probes, all designed for "upward-sloping holes." The characteristics of this type of probe are: during testing, a capsule is installed below the probe, and air is pumped into the capsule to seal the area below the probe. Water is then pumped into the hole above the capsule through a water inlet pipe. Once the top probe is submerged, all three probes are fully coupled to the hole wall, allowing testing to proceed. After testing, the air inside the capsule is released, the capsule detaches from the hole wall, and the water flows out naturally by gravity. The probe can then be moved to the next test point. Because frequent water injection and drainage are required inside the hole, workers below are often soaked, especially in winter. This testing method is also prone to problems: sometimes excessive water injection causes the air bladder to rupture, and sometimes insufficient water injection leads to poor coupling. The overall operation is cumbersome and complex, resulting in limited adoption.

[0004] In the prior art, for example, Chinese invention patent application CN114994747A discloses a "gravity-type dry-hole acoustic probe", which includes a pickup, a bag, an inlet and outlet pipe, a plug, a multi-hole connector, and a pickup signal line; the acoustic probe is provided with a first pickup, a second pickup, and a third pickup in sequence, the first pickup transmits a signal, and the other two receive the signal, and the pickups are connected by screws through the multi-hole connector; the free ends of the first pickup and the third pickup are respectively connected by screws to the first plug and the third plug. The two end caps, the vibratory pickup, the multi-hole connector, and the outer side of the end caps are fitted with a bag. The two ends of the bag are respectively sealed and connected to the outer peripheral walls of the two end caps. The inlet and outlet pipes and the signal line of the vibratory pickup pass through the first end cap and enter the inner cavity of the bag. Water is injected and drained into the bag through the inlet and outlet pipes. The water injection makes the bag contact the hole wall. The vibratory pickup realizes the upward-sloping dry hole acoustic wave test through water coupling. After the test, the water in the bag is discharged by gravity through the inlet and outlet pipes to avoid the test personnel getting wet. The contact between the bag and the hole wall can ensure the coupling effect and ensure the accuracy of the exploration.

[0005] However, the aforementioned gravity-type dry-hole acoustic probe is only suitable for upward-sloping holes. If the gravity-type dry-hole acoustic probe is used to test downward-sloping or vertical holes, the water in its bag is difficult to drain or extract, which will cause the acoustic probe to become immobile and difficult to pull out of the hole. Therefore, the aforementioned gravity-type dry-hole acoustic probe is not suitable for downward-sloping or vertical holes. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide an inflatable dry hole acoustic wave test probe. The water storage space of the water reservoir and the water storage bag are connected to each other. The water stored in the water reservoir can be squeezed into the water storage bag by inflating the air bag to achieve the coupling between the vibration pickup and the hole wall. After the test, the air in the air bag is released and the water flows back to the water storage space. It can be applied to drilling test work of different depths in various directions.

[0007] To address the aforementioned technical problems, the present invention provides an inflatable dry-hole acoustic wave test probe, comprising an acoustic wave probe assembly and a water reservoir arranged sequentially along the front-to-back direction and detachably connected.

[0008] The acoustic probe assembly includes a vibration pickup assembly, a first plug and a second plug respectively disposed at both ends of the vibration pickup assembly, and a water storage bag sleeved on the outside of the vibration pickup assembly, wherein both ends of the water storage bag are sealed and fixed to the first plug and the second plug respectively.

[0009] The water reservoir includes a water reservoir shell, a hollow shaft fixed inside the water reservoir, and an inflatable airbag sleeved outside the hollow shaft. The signal line of the vibration pickup assembly extends backward through the hollow shaft. The two ends of the inflatable airbag are sealed and fixed to the two ends of the water reservoir shell, forming a water storage space between them. The front and rear ends of the water reservoir shell are respectively provided with a water inlet communicating with the water storage space and an inflation port communicating with the inflatable airbag. The water inlet is sealed and communicated with the water storage bag.

[0010] Furthermore, the water storage tank housing includes a cylindrical housing, with a first water storage plug and a second water storage plug respectively provided at the front and rear ends of the cylindrical housing. Both the first water storage plug and the second water storage plug have through holes at their centers. The hollow shaft passes through the two through holes from back to front and is sealed and fixed to the two through holes.

[0011] Furthermore, the opposite ends of the first plug and the second plug of the water reservoir are provided with inner extension rings concentric with the through hole, and the two ends of the inflatable airbag are respectively inserted and sealed on the corresponding inner extension rings.

[0012] Furthermore, the water inlet is located on the first plug of the water reservoir, the air inlet is located on the second plug of the water reservoir, and the air inlet is located on the portion of the second plug of the water reservoir located within its inner extension ring.

[0013] Furthermore, the second plug of the water storage device has an inlet corresponding to the position of the water storage space, and the inlet and the outlet are arranged concentrically and connected to the water storage space.

[0014] Furthermore, a signal amplifier is provided between the acoustic probe assembly and the water storage tank. The signal amplifier includes a cylindrical amplifier housing and an amplifier element disposed within the amplifier housing. The two opposite ends of the acoustic probe assembly and the water storage tank are detachably fixed to the two ends of the amplifier housing. The signal line includes a pickup signal line and an amplifier signal line. The pickup signal line connects the pickup assembly and the signal amplifier. The amplifier signal line extends rearward to connect to the receiving device.

[0015] Furthermore, a connecting pipe is provided at the front end of the water storage tank housing, and a connector is provided at the front end of the connecting pipe. The connecting pipe is fixedly installed on the amplifier housing through the connector.

[0016] Furthermore, the second plug and the connector are respectively provided with a first connection hole and a second connection hole. The first connection hole, the second connection hole and the water inlet are concentric and collinear. The first connection hole is connected to the inside of the water storage bag. The first connection hole, the second connection hole and the water inlet are connected through the inlet and outlet pipes.

[0017] Furthermore, the first plug has a vent hole that extends through the front and rear directions in the middle, and a lifting eye screw is threadedly connected to the front end of the vent hole, and the lifting eye screw and the vent hole are sealed together.

[0018] Furthermore, a guide is provided at the rear end of the water storage tank shell. The guide is a conical structure that is larger at the front and smaller at the back. The rear end of the guide is fixedly connected to a hollow shaft. A first guide opening is provided on the middle circumference of the guide corresponding to the air inlet. An air inlet and outlet pipe passes through the first guide opening. The front end of the air inlet and outlet pipe is connected to the air inlet.

[0019] Furthermore, the vibration pickup assembly includes a first vibration pickup, a second vibration pickup, and a third vibration pickup arranged sequentially in the front-back direction. A first multi-hole connector and a second multi-hole connector are detachably connected between the first vibration pickup and the second vibration pickup, and between the second vibration pickup and the third vibration pickup, respectively.

[0020] Furthermore, high-strength fiber connections are made between the first and second vibration pickups, as well as between the second and third vibration pickups.

[0021] Furthermore, the rear end of the hollow shaft extends out of the water reservoir housing and has a wire groove. The signal line extends backward through the wire groove. A columnar nut is fixedly installed at the rear end of the hollow shaft, and a push rod is threaded onto the columnar nut.

[0022] Furthermore, the inner surface of the water storage bag is rough and the outer surface is smooth.

[0023] Furthermore, explosion-proof capsules are respectively fitted at both ends of the water storage bag.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] (1) A water reservoir is connected to the rear of the acoustic probe assembly. An inflatable bladder and the outer shell of the water reservoir form a water storage space. In actual use, the water reservoir follows the acoustic probe assembly into the hole. When the acoustic probe assembly reaches the designated position, it is inflated through the inflation port. The inflatable bladder expands, squeezing the water in the water storage space into the water storage bladder through the water inlet, ensuring full contact between the water storage bladder and the hole wall. This allows the vibration pickup to couple with the hole wall via water, enabling acoustic testing. After data acquisition, the inflation port is deflated, the inflatable bladder retracts, and the water in the water storage bladder flows back into the water storage space. The water storage bladder then retracts and separates from the hole wall, allowing the acoustic probe to move to the next test point. This invention allows for acoustic testing at any drilling angle without the need for an additional water pump or water source; simply inflating and deflating the bladder is sufficient, making it convenient and quick.

[0026] The water reservoir with a rigid shell is located at the rear of the acoustic probe assembly, which allows the acoustic probe assembly to be easily inserted into the upper angled hole. The two can be detached for easy carrying and transportation.

[0027] (2) For deep boreholes, the weak signal output by the vibration pickup is easily weakened when it is transmitted to the receiving device through a long signal line. By using a signal amplifier, the output signal of the vibration pickup component can be filtered and amplified to convert it into a differential signal for output. This ensures that the received signal is not distorted during long-distance transmission, improves the quality and recognizability of the signal, and thus obtains the acoustic information inside the borehole more accurately. This ensures the accuracy and reliability of the exploration data and is conducive to the accurate analysis of geological structure and other information in engineering geological exploration work.

[0028] (3) An inlet is provided on the second plug of the water storage device so that the water in the storage space can be released when not in use, making it convenient for transportation and carrying.

[0029] (4) The connector and the second plug are provided with concentric and collinear first and second connection holes and are connected to the water inlet through the inlet and outlet pipes, forming a complete water flow path, so that the water between the water storage bag and the water storage device can be exchanged stably and efficiently, which facilitates precise control of the water volume in the water storage bag, ensures the coupling effect between the acoustic probe and the hole wall under different drilling conditions, and ensures that the water storage bag is not burst by the appropriate water volume.

[0030] (5) The conical guide facilitates the removal of the inflatable dry hole acoustic test probe from the test borehole.

[0031] (6) The inner surface of the water reservoir bag is designed to be rough, which increases the friction between the water reservoir bag and the plug assembly, ensuring that the water reservoir bag is not easily detached. The outer surface of the water reservoir bag is designed to be smooth and flat, which is conducive to the coupling between the columnar water reservoir bag and the orifice wall and improves signal quality. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of an inflatable dry-hole acoustic wave test probe according to Embodiment 1 of the present invention.

[0033] Figure 2 This is a cross-sectional view of an inflatable dry-hole acoustic wave test probe according to Embodiment 1 of the present invention.

[0034] Figure 3 This is a schematic diagram of the structure and appearance of the acoustic probe assembly and signal amplifier in Embodiment 1 of the present invention.

[0035] Figure 4 This is a cross-sectional view of the acoustic probe assembly and signal amplifier in Embodiment 1 of the present invention.

[0036] Figure 5 This is a schematic diagram of the structure and appearance of the water storage device, connecting pipe and guide in Embodiment 1 of the present invention.

[0037] Figure 6 This is a cross-sectional view of the water storage device in Embodiment 1 of the present invention.

[0038] Figure 7 This is a cross-sectional view of the first plug in Embodiment 1 of the present invention.

[0039] Figure 8 This is a schematic diagram of the structure and appearance of the second plug in Embodiment 1 of the present invention.

[0040] Figure 9 This is an isometric view of the first direction of the first plug of the water storage device in Embodiment 1 of the present invention.

[0041] Figure 10 This is a second-direction isometric view of the first plug of the water storage device in Embodiment 1 of the present invention.

[0042] Figure 11 This is an isometric view of the second plug of the water storage device in the first direction in Embodiment 1 of the present invention.

[0043] Figure 12 This is a second-direction isometric view of the second plug of the water storage device in Embodiment 1 of the present invention.

[0044] Figure 13 This is a schematic diagram of the connector structure in Embodiment 1 of the present invention.

[0045] Figure 14 This is a composition diagram of the amplifier components in Embodiment 1 of the present invention.

[0046] Figure 15 This is a composition diagram of the filter in Embodiment 1 of the present invention.

[0047] Figure 16 This is a schematic diagram of the structure and appearance of the vibration pickup assembly and signal amplifier in Embodiment 1 of the present invention.

[0048] In the diagram: 1. Acoustic probe assembly; 11. Vibration pickup assembly; 111. First vibration pickup; 112. Second vibration pickup; 113. Third vibration pickup; 114. First multi-hole connector; 115. Second multi-hole connector; 116. High-strength fiber; 121. First plug; 1211. Vent hole; 122. Second plug; 123. Protective ring; 124. Lifting eye screw; 125. Explosion-proof capsule; 126. First connecting hole; 13. Water storage bag; 15. Signal line; 151. Vibration pickup signal line; 152. Amplifier signal line;

[0049] 2. Water reservoir; 21. Water reservoir outer shell; 211. Cylindrical outer shell; 212. First plug of water reservoir; 213. Second plug of water reservoir; 214. Through hole; 215. Inner ring; 22. Water inlet; 23. Air inlet; 24. Water inlet; 25. Hollow shaft; 251. Cable trough; 26. First capillary tube; 27. Second capillary tube; 28. Third capillary tube; 29. ​​Inflatable air bladder; 210. Water storage space;

[0050] 3. Connecting pipe; 4. Connector; 41. Second connecting hole; 5. Inlet and outlet pipes; 6. Water inlet pipe; 7. Air inlet and outlet pipes;

[0051] 8. Guide; 9. Columnar nut; 10. Signal amplifier; 101. Amplifier housing; 102. Amplifier element; 1021. Preamplifier; 1022. Filter; 1023. Differential amplifier; 1024. Matching circuit; 1025. High-pass filter; 1026. Band-pass filter; 1027. Low-pass filter. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings: Specific Implementation Example 1:

[0054] refer to Figures 1 to 16 This invention discloses an inflatable dry-hole acoustic wave test probe (hereinafter referred to as the test probe), comprising an acoustic wave probe assembly 1 and a water reservoir 2 arranged sequentially and detachably in a front-to-back direction. The acoustic wave probe assembly 1 includes a pickup assembly 11, a first plug 121 and a second plug 122 respectively disposed at both ends of the pickup assembly 11, high-strength fibers 116 connecting adjacent pickups, and a water reservoir 13 sleeved on the outside of the pickup assembly 11. The two ends of the water reservoir 13 are sealed and fixed to the first plug 121 and the second plug 122 respectively. Explosion-proof capsules 125 are sleeved on the outer sides of both ends of the water reservoir 13. The first plug 121 is provided with an air vent 1211 and a lifting eye screw 124. In this way, a sealed space is formed inside the water reservoir 13. In actual use, water is first filled into the water reservoir 13 to expel the internal air, and then the lifting eye screw 124 is tightened before inserting the test probe into the test borehole. As water continues to be injected into the water storage bag, the water storage bag 13 expands and comes into full contact with the hole wall. The vibration pickup assembly 11 is coupled with the hole wall through water, and thus the sound wave test can be performed on that point.

[0055] Furthermore, in this embodiment, the first plug 121, the second plug 122, the vibration pickup assembly 11, and the water storage bag 13 are arranged concentrically, which allows the vibration pickup assembly 11 to be located in the middle of the borehole during testing, thereby enhancing the initial arrival signal strength of the longitudinal wave and improving signal quality.

[0056] In this embodiment, the water reservoir 2 includes a water reservoir housing 21, a hollow shaft 25 passing through and fixed inside the water reservoir housing 21, and an inflatable airbag 29 sleeved outside the hollow shaft 25. The signal line 15 of the vibration pickup assembly 11 extends rearward through the hollow shaft 25 to connect with external equipment. The two ends of the inflatable airbag 29 are sealed and fixed to the two ends of the water reservoir housing 21, forming a water storage space 210 between them, which stores water. The front and rear ends of the water reservoir housing 21 are respectively provided with a water inlet 22 communicating with the water storage space 210 and an inflation port 23 communicating with the inflatable airbag 29. The water inlet 22 is sealed and connected to the water storage bag 13.

[0057] The rear of the acoustic probe assembly 1 is connected to the water reservoir 2. The inflatable bladder 29 of the water reservoir 2 and the outer shell 21 of the water reservoir form a water storage space 210. In actual use, the test probe is inserted into the hole. When the test probe reaches the designated position, it is inflated through the inflation port 23. The inflatable bladder 29 expands, and the water in the water storage space 210 is squeezed and enters the water storage bag 13 through the water inlet 22, so that the water storage bag 13 is in full contact with the hole wall. The explosion-proof capsule 125 is used to protect the water storage bag 13 from explosion. The vibration pickup can be coupled with the hole wall through water to perform acoustic testing. After the data acquisition is completed, the inflation port 23 is deflated, the inflatable bladder 29 retracts, and the water in the water storage bag 13 flows back to the water storage space 210. The water storage bag 13 retracts and separates from the hole wall, and the acoustic probe can move to the next test point. The test probe can perform acoustic testing on boreholes at any angle, and no additional water pump or water source is required. It only needs to be filled and vented, which is convenient, quick and easy to use for testing.

[0058] The water reservoir with a rigid shell is located at the rear of the acoustic probe assembly, which allows the acoustic probe assembly to be easily inserted into the upper angled hole. The two can be detached for easy carrying and transportation.

[0059] Specifically, in this embodiment, such as Figure 2 , 3 As shown, the vibration pickup assembly 11 includes three vibration pickups, namely a first vibration pickup 111, a second vibration pickup 112 and a third vibration pickup 113 arranged sequentially in the front-back direction. The third vibration pickup 113 is used to transmit signals, and the first vibration pickup 111 and the second vibration pickup 112 are used to receive signals.

[0060] Adjacent vibration pickups are connected by porous connectors, which include a first porous connector 114 detachably connected between the first vibration pickup 111 and the second vibration pickup 112, and a second porous connector 115 connected between the second vibration pickup 112 and the third vibration pickup 113. Specifically, both the first porous connector 114 and the second porous connector 115 are cylindrical thin-walled hollow tube structures with multiple gaps on their sidewalls. These gaps prevent the second vibration pickup 112 and the third vibration pickup 113 from receiving interference signals that propagate directly along the porous connectors, thereby improving the signal-to-noise ratio.

[0061] In this embodiment, as Figure 16As shown, each end of the vibratory pickup has an extension section. The front and rear ends of the porous connector are respectively inserted into the corresponding extension sections of the vibratory pickup and fixedly connected by screws. In this embodiment, both the first porous connector 114 and the second porous connector 115 are nylon connecting parts. The wave velocity of nylon material is relatively lower than that of rigid material. To prevent the porous connectors between adjacent vibratory pickups from breaking when the water storage bag 13 expands, high-strength fibers 116 are also connected between adjacent vibratory pickups. Specifically, three high-strength fibers 116 are arranged in a ring array along the axial direction between adjacent vibratory pickups to increase the overall service life of the acoustic probe. At the same time, when the water storage bag 13 is filled with water and expands, the nylon porous connectors are easily stretched, which leads to a longer distance between adjacent vibratory pickups and a longer sound wave propagation time. Therefore, the use of high-strength fibers 116 can also prevent changes in the distance between adjacent vibratory pickups from causing inaccurate wave velocity calculations.

[0062] In this embodiment, as Figure 4 , 7 As shown, the rear of the first plug 121 is provided with a slot adapted to the extension of the first vibration pickup 111. This slot is fitted onto the extension of the front end of the first vibration pickup 111 and is fixedly connected by screws. A vent 1211 extending in the front-rear direction is provided in the middle of the first plug 121. The vent 1211 communicates with the water storage bag 13. A lifting eye screw 124 is threaded to the front end of the vent 1211, and the lifting eye screw 124 and the vent 1211 are sealed together by a sealing gasket. In actual use, the front end of the acoustic probe assembly 1 is first positioned upwards, the lifting eye screw 124 is loosened, and water is simultaneously injected into the water storage bag 13. When water overflows from the upper end of the first plug 121, it indicates that the air inside the water storage bag 13 has been emptied.

[0063] In this embodiment, the outer contour of the first plug 121 includes a large-diameter section, a medium-diameter section, and a small-diameter section from front to back. The front end of the water storage bag 13 is fitted onto the medium-diameter section, and an explosion-proof capsule 125 is provided to fix and seal it to prevent it from falling off. The explosion-proof capsule 125 can prevent the water storage bag 13 from suddenly expanding in a fixed position and bursting when water is injected and expanded. The outer periphery of the small-diameter section is flush with the outer periphery of the first vibration pickup 111. The extension of the first vibration pickup 111 is inserted into the inner ring of the small-diameter section and fixedly connected with screws.

[0064] By utilizing the diameter difference between the small-diameter and medium-diameter sections of the first plug 121, the water storage bag 13 and the vibration pickup assembly 11 can be arranged at intervals. This avoids direct contact between the screws used to fix the vibration pickups and the multi-hole connectors, and between the vibration pickup assembly and the first and second plugs, thus protecting the water storage bag 13. The outer periphery of the large-diameter section is flush with the outer periphery of the explosion-proof capsule 125, and a tapered structure is provided at the front of the large-diameter section to facilitate entry and exit of the test borehole.

[0065] In this embodiment, as Figure 2 , 3 As shown in Figure 4, a signal amplifier 10 is provided between the acoustic probe assembly 1 and the water storage tank 2. The signal amplifier 10 includes a cylindrical amplifier housing 101 and an amplifier element 102 disposed inside the amplifier housing 101. The acoustic probe assembly 1 and the water storage tank 2 are fixed at both ends of the amplifier housing 101. The signal line 15 includes a pickup signal line 151 and an amplifier signal line 152. The pickup signal line 151 is connected to the signal amplifier 10, and the amplifier signal line 152 extends backward to connect to an external receiving device.

[0066] Specifically, in this embodiment, the front end of the amplifier housing 101 is provided with a mounting hole that matches the extension of the third pickup 113. The outer diameter of the amplifier housing 101 matches the outer diameter of the pickup. The rear end of the third pickup 113 extends into the front end of the amplifier housing 101 and is fixedly connected to the front end of the amplifier housing 101 by screws. The pickup signal line 151 passes through the mounting hole into the amplifier housing 101 and is connected to the amplifier element 102 inside it.

[0067] The inner diameter of the second plug 122 is adapted to the outer diameter of the amplifier housing 101, and the outer diameter of the second plug 122 is adapted to the middle diameter section of the first plug 121. The second plug 122 is fitted onto the front of the amplifier housing 101 and detachably fixed with screws, and there is a sealing fit between the second plug 122 and the amplifier housing 101. A protective ring 123 is fixedly provided on the outer circumference of the rear part of the second plug 122, forming a variable diameter structure. The rear end of the water storage bag 13 is fitted onto the second plug 122 and sealed and fixed by the explosion-proof capsule 125. At the same time, the outer circumference of the explosion-proof capsule 125 is aligned with the outer circumference of the protective ring 123, ensuring that the water storage bag 13 is a cylindrical structure of equal diameter.

[0068] Preferably, in this embodiment, the inner surface of the water storage bag 13 is rough, which can increase the friction between the water storage bag 13 and the plug assembly, ensuring that the water storage bag 13 is not easy to fall off.

[0069] The smooth and flat outer surface of the water reservoir 13 facilitates coupling between the columnar water reservoir 13 and the borehole wall, improving signal quality. At the same time, it reduces the frictional resistance between the water reservoir 13 and the borehole wall when moving inside the borehole, making it easier to insert and remove the test probe and reducing the risk of the water reservoir 13 being scratched.

[0070] In this embodiment, the amplifier signal line 152 is a twisted pair cable, such as... Figure 14 , 15 As shown, amplifier element 102 includes a preamplifier 1021, a filter 1022, a differential amplifier 1023, and a matching circuit 1024. This allows the signal from the receiving oscillator ceramic tube to be denoised, amplified, and then converted into a balanced differential signal. Using twisted-pair cables, the received weak signal can be transmitted over a longer distance without distortion, ensuring the quality of deep hole detection.

[0071] Specifically, in this embodiment, the input and output terminals of the preamplifier 1021, filter 1022, and differential amplifier 1023 are connected in series. The input terminal of the preamplifier 1021 is connected to the output terminal of the pickup signal line 151, and a matching circuit 1024 is set at the output terminal of the differential amplifier 1023 and connected to the amplifier signal line 152. In this way, the preamplifier 1021 receives the weak signal from the ceramic tube of the pickup assembly 11, amplifies it, and the amplified signal enters the filter 1022 to remove noise components and improve signal quality. The filtered signal enters the differential amplifier 1023 to complete the differential signal conversion. The converted balanced differential signal is adjusted by the matching circuit 1024 to match the characteristic impedance of the twisted pair, so that the signal can be transmitted in the twisted pair with minimal loss and distortion.

[0072] Due to the anti-interference properties of differential signals and the good transmission conditions after matching, common-mode noise is suppressed and distortion is small when the signal is transmitted over twisted-pair cables. This allows for distortion-free transmission over long distances, ensuring that the signal can still be effectively received and processed after long-distance transmission.

[0073] In this embodiment, as Figure 15 As shown, filter 1022 includes a high-pass filter 1025, a band-pass filter 1026, and a low-pass filter 1027 connected in series. The amplified signal input from preamplifier 1021 first enters the high-pass filter 1025 to filter out low-frequency interference, then passes through the band-pass filter 1026 to further filter out the target sound wave frequency band, and finally uses the low-pass filter 1027 to remove residual high-frequency noise, thereby maximizing signal quality and achieving fine filtering processing.

[0074] In this embodiment, as Figure 5 , 6As shown, the water storage tank housing 21 includes a cylindrical housing 211. The front and rear ends of the cylindrical housing 211 are respectively provided with a first water storage plug 212 and a second water storage plug 213. The center of the first water storage plug 212 and the second water storage plug 213 are provided with through holes 214. The hollow shaft 25 passes through the two through holes 214 from back to front and is welded to the two through holes 214 to achieve fixation and sealing.

[0075] like Figure 9 , 10 As shown in Figures 11 and 12, an inner extension ring 215 concentric with the through hole 214 is provided at the opposite ends of the first plug 212 and the second plug 213 of the water reservoir. The two ends of the inflatable airbag 29 are respectively inserted through and sealed onto the corresponding inner extension ring 215. An inflation space is formed between the inflatable airbag 29 and the hollow shaft 25. A water inlet 22 is located on the end face of the first plug 212 of the water reservoir, and the water inlet 22 is connected to the water storage space 210 between the inflatable airbag 29 and the outer shell 21 of the water reservoir.

[0076] The inflation port 23 is located on the end face of the second plug 213 of the water reservoir. Specifically, the inflation port 23 is located on the portion of the second plug 213 located inside its inner extension ring 215, that is, the inflation port 23 is located between the through hole 214 of the second plug 213 and the inner circumference of its inner extension ring 215. This allows the inflation port 23 to connect to the inflation space and to communicate with the interior of the inflation airbag 29.

[0077] In this embodiment, an inlet 24 is provided at the position of the second plug 213 of the water reservoir corresponding to the water storage space 210, and the inlet 24 is arranged concentrically with the outlet 22. In this way, water can be introduced into and out of the water storage bag 13 and the water storage space 210 through the inlet 24.

[0078] In this embodiment, a connecting pipe 3 is provided at the front end of the water storage housing 21, and a connector 4 is provided at the front end of the connecting pipe 3. The connecting pipe 3 is fixedly installed on the amplifier housing 101 through the connector 4.

[0079] Specifically, the connecting pipe 3 is a steel pipe, which is welded and fixed to the front end of the first plug 212 of the water reservoir. The outer diameter of the connecting pipe 3 is adapted to the outer diameter of the outer shell 21 of the water reservoir. A first capillary steel pipe 26 is provided on the front side of the first plug 212 of the water reservoir at the position corresponding to the water inlet 22. The first capillary steel pipe 26 is located inside the connecting pipe 3.

[0080] The outer periphery of connector 4 has a stepped variable diameter structure with a larger front and a smaller rear. The inner diameter of connector 4 is adapted to the outer diameter of amplifier housing 101. Connector 4 is fitted onto the rear of amplifier housing 101. The smaller diameter section of the rear of connector 4 is inserted into the inner cavity of connecting tube 3. A fastening hole is provided at the overlapping position of connecting tube 3 and connector 4. Connecting tube 3 and connector 4 are fastened to the rear of amplifier housing 101 by fixing screws passing through the fastening hole.

[0081] In this embodiment, preferably, the connector 4 and the second plug 122 are respectively located on the front and rear sides of the amplifier housing 101. A first connecting hole 126 and a second connecting hole 41 are respectively provided on the second plug 122 and the connector 4, and both the first connecting hole 126 and the second connecting hole 41 are through holes. The first connecting hole 126, the second connecting hole 41, and the water inlet 22 are concentric and collinear. The first connecting hole 126 is connected to the interior of the water storage bag 13. An inlet / outlet pipe 5 is sealed and connected to the front end of the first capillary steel tube 26 of the water inlet 22. The front end of the inlet / outlet pipe 5 passes through the second connecting hole 41 and is connected to the first connecting hole 126 of the second plug 122. Specifically, a rubber tube is provided at the front end of the first capillary steel tube 26, and the inlet / outlet pipe 5 is an inlet / outlet rubber tube. The rubber tubes are connected to each other via quick-connect fittings. This allows the first connecting hole 126, the second connecting hole 41, and the water inlet 22 to be connected via the inlet / outlet pipe 5, thus connecting the water storage space 210 to the water storage bag 13. Meanwhile, the protective ring 123 at the rear of the second plug 122 can protect the inlet and outlet pipes 5.

[0082] In this embodiment, as Figure 11 , 12 As shown, a second capillary tube 27 and a third capillary tube 28 are respectively installed at the rear end of the second plug 213 of the water reservoir, corresponding to the air inlet 23 and the water inlet 24. (Refer to...) Figure 5 The second capillary steel tube 27 is connected to an air inlet / outlet pipe 7, and the third capillary steel tube 28 is connected to a water inlet pipe 6. The rear end of the air inlet / outlet pipe 7 extends to connect to an external inflation device, and the water inlet pipe 6 is used to inject water into the water storage bag 13 and the water storage space 210 when no hole test is performed.

[0083] In this embodiment, preferably, the rear end of the hollow shaft 25 extends out of the water reservoir housing 21 and has a wire groove 251. The signal line 15 extends rearward through the wire groove 251. A columnar nut 9 is fixedly installed at the rear end of the hollow shaft 25, and a push rod is threaded onto the columnar nut 9. The push rod is used to drive the test probe to move within the hole.

[0084] In this embodiment, as Figure 5As shown, a conical guide 8, which is larger at the front and smaller at the back, is fixedly installed at the rear end of the water reservoir 2. The guide 8 is entirely inserted through the hollow shaft 25, exposing the wire groove 251. The front end of the guide 8 is fixedly welded to the rear end of the second plug 213 of the water reservoir, and a second capillary steel tube 27 and a third capillary steel tube 28 are welded thereon. A first guide hole and a second guide hole are respectively opened on the middle circumference of the guide 8 at the positions corresponding to the air inlet 23 and the water inlet 24. The water inlet pipe 6 and the air inlet and outlet pipe 7 extend backward through the corresponding guide holes.

[0085] How to use this application:

[0086] Step 1: Connect signal cable 15 to the external instrument.

[0087] Step 2: Connect the hose connected to the first capillary steel tube 26 to the inlet and outlet hoses on the front side of the water reservoir 2 with a quick connector to achieve the connection between the water reservoir 2 and the water storage bag 13.

[0088] Step 3: Insert the rear end of connector 4 into the front end of connector tube 3 and tighten it with fixing screws to complete the assembly of the test probe.

[0089] Step 4: Before placing the test probe, ensure the front end of the acoustic probe assembly 1 is higher than the water reservoir 2. Remove the lifting eye screw 124 and fill the water reservoir 2 with water through the inlet pipe 6. When water flows out from the front end of the first plug 121, the inside of the water reservoir 2 and the water storage bag 13 will be full of water, and the air between the vibration pickup assembly 11 and the water storage bag 13 will be completely expelled. At this point, stop filling the water, seal the inlet 24, and tighten the lifting eye screw 124 to complete the seal, ensuring that the water inside the test probe does not leak out.

[0090] Step 5: Use a quick connector to connect the high-pressure air hose on the air pump to the air inlet and outlet pipe 7 on the right side of the water tank 2.

[0091] Step 6: Send the inflatable dry hole acoustic wave test probe to the test position.

[0092] Step 7: Use an air pump to pump air into the high-pressure air pipe. The water in the water reservoir 2 is squeezed into the water storage bag 13. The water storage bag 13 is in full contact with the hole wall. At this time, the test can be carried out.

[0093] Step 8: After the test is completed, the air is released and the water in the water storage bag 13 flows back to the water storage tank 2. The water storage bag 13 is separated from the hole wall, and the inflatable dry hole acoustic wave test probe can be moved to the next test point. Repeat steps 7 and 8 until the test is completed.

[0094] Step 9: After the test is completed, pull out the test probe, open the eyelet screw 124 and the water inlet 24 to allow all the water inside to flow out freely.

[0095] Step 10: Remove the screws connecting the water tank 2 and the acoustic probe assembly 1. Separate the water tank 2 and the acoustic probe assembly, and reel in the cable to finish the job.

[0096] In summary, the test probe of this invention is applicable to acoustic testing of boreholes in various directions without water. No water source is required on-site; only an air pump is needed, making it widely applicable. The water reservoir 2 and the acoustic probe assembly 1 are easily detachable and assembled, facilitating transportation and practicality. The signal amplifier 10 ensures that the weak signal from the pickup assembly 11 is transmitted over greater distances without distortion, improving the accuracy and quality of deep hole testing.

[0097] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

[0098] In the description of the embodiments of this application, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0099] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

Claims

1. An inflatable dry-hole acoustic wave testing probe, characterized in that, Includes a sound wave probe assembly and a water storage tank arranged sequentially in the front-to-back direction and detachably connected. The acoustic probe assembly includes a vibration pickup assembly, a first plug and a second plug respectively disposed at both ends of the vibration pickup assembly, and a water storage bag sleeved on the outside of the vibration pickup assembly, wherein both ends of the water storage bag are sealed and fixed to the first plug and the second plug respectively. The water storage device includes a water storage device shell, a hollow shaft fixed inside the water storage device, and an inflatable airbag sleeved outside the hollow shaft. The signal line of the vibration pickup assembly extends backward through the hollow shaft. The two ends of the inflatable airbag are respectively sealed and fixed to the two ends of the water storage device shell, forming a water storage space between them. The front and rear ends of the water storage device shell are respectively provided with a water inlet communicating with the water storage space and an inflation port communicating with the inflatable airbag. The water inlet is sealed and communicated with the water storage bag. A signal amplifier is provided between the acoustic probe assembly and the water storage tank. The signal amplifier includes a cylindrical amplifier housing and an amplifier element disposed within the amplifier housing. The two opposite ends of the acoustic probe assembly and the water storage tank are detachably fixed to the two ends of the amplifier housing. The signal line includes a pickup signal line and an amplifier signal line. The pickup signal line connects the pickup assembly and the signal amplifier. The amplifier signal line extends backward to connect to the receiving device. The vibration pickup assembly includes a first vibration pickup, a second vibration pickup, and a third vibration pickup arranged sequentially in the front-back direction. A first multi-hole connector and a second multi-hole connector are detachably connected between the first vibration pickup and the second vibration pickup, and between the second vibration pickup and the third vibration pickup, respectively. High-strength fiber connections are used to connect the first and second vibration pickups, as well as the second and third vibration pickups. The inner surface of the water storage bag is rough, while the outer surface is smooth.

2. The inflatable dry-hole acoustic wave test probe according to claim 1, characterized in that, The water storage tank housing includes a cylindrical housing, with a first water storage plug and a second water storage plug respectively provided at the front and rear ends of the cylindrical housing. Both the first water storage plug and the second water storage plug have through holes in their centers. The hollow shaft passes through the two through holes from back to front and is sealed and fixed to the two through holes.

3. The inflatable dry-hole acoustic wave test probe according to claim 2, characterized in that, The first and second plugs of the water reservoir are provided with inner extension rings concentric with the through hole at their opposite ends, and the two ends of the inflatable airbag are respectively inserted and sealed on the corresponding inner extension rings.

4. The inflatable dry-hole acoustic wave test probe according to claim 3, characterized in that, The water inlet is located on the first plug of the water reservoir, and the air inlet is located on the second plug of the water reservoir, specifically on the portion of the second plug located within its inner extension ring.

5. The inflatable dry-hole acoustic wave test probe according to claim 4, characterized in that, The second plug of the water storage device has an inlet corresponding to the position of the water storage space. The inlet and the outlet are arranged concentrically and are connected to the water storage space.

6. The inflatable dry-hole acoustic wave test probe according to claim 5, characterized in that, A connecting pipe is provided at the front end of the water storage tank housing, and a connector is provided at the front end of the connecting pipe. The connecting pipe is fixedly installed on the amplifier housing through the connector.

7. The inflatable dry-hole acoustic wave test probe according to claim 6, characterized in that, The second plug and connector are respectively provided with a first connection hole and a second connection hole. The first connection hole, the second connection hole and the water inlet are concentric and collinear. The first connection hole is connected to the inside of the water storage bag. The first connection hole, the second connection hole and the water inlet are connected through the inlet and outlet pipes.

8. The inflatable dry-hole acoustic wave test probe according to claim 6, characterized in that, The first plug has a vent hole that runs through the front and rear directions in the middle. The front end of the vent hole is threaded with a lifting eye screw, and the lifting eye screw and the vent hole are sealed together.

9. The inflatable dry-hole acoustic wave test probe according to claim 1, characterized in that, The rear end of the water storage tank shell is provided with a guide. The guide is a conical structure that is larger at the front and smaller at the back. The rear end of the guide is fixedly connected to a hollow shaft. The middle circumference of the guide is provided with a first guide opening corresponding to the air inlet. An air inlet and outlet pipe passes through the first guide opening. The front end of the air inlet and outlet pipe is connected to the air inlet.

10. The inflatable dry-hole acoustic wave test probe according to claim 1, characterized in that, The rear end of the hollow shaft extends out of the water reservoir housing and has a wire groove. The signal line extends backward through the wire groove. A columnar nut is fixedly installed at the rear end of the hollow shaft, and a push rod is threaded onto the columnar nut.

11. The inflatable dry-hole acoustic wave test probe according to claim 1, characterized in that, The water storage bag is fitted with explosion-proof capsules at both ends.

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