A borehole multi-parameter sensor positioning device for rock breaking test

Abstract

The utility model discloses a kind of hole multi-parameter sensor positioning devices for rock breaking test, including central support pipe, sensor integrated ring seat, main sliding block, replaceable wall-attached shoe, driving cone, driving rod and locking retaining member. Sensor integrated ring seat is equipped with multiple radial sliding slots in circumference, driving cone is equipped with inclined guide slot corresponding main sliding block, and guide pin on main sliding block is bidirectionally constrained by guide slot wall, so that main sliding block can be actively extended to wall-attached and be forced to recover when driving cone reversely moves. Central support pipe is equipped with depth scale, axial limiting member, circumferential anti-rotation structure and azimuth reference mark. Different wall-attached shoes are respectively adapted to PVDF piezoelectric film, three-axis accelerometer and thermocouple, and are adapted to different hole diameters by different outer arc radius and radial effective height. The device can improve the wall-attached stability, depth and orientation consistency and recovery reliability of hole multi-parameter sensor.

Description

Technical Field

[0001] This utility model belongs to the technical field of rock breaking test measurement and testing and in-hole sensor installation, specifically relating to an in-hole multi-parameter sensor positioning device for rock breaking tests. Background Technology

[0002] In liquid gas rock breaking, blasting disturbance, and other dynamic rock mass loading tests, monitoring boreholes are typically installed beside the rock breaking borehole to obtain the dynamic pressure, vibration response, and temperature changes of the adjacent rock mass during the rock breaking process. Different types of sensors, such as PVDF piezoelectric films, triaxial accelerometers, and thermocouples, are then placed at predetermined positions within these monitoring boreholes. Due to the limited space within the borehole, the non-circularity and local unevenness of the borehole wall surface, and the significant vibrations generated during the rock breaking process, the sensor installation structure must simultaneously meet the requirements of predetermined depth positioning, circumferential orientation control, reliable wall adhesion, signal coupling, and post-test retrievability.

[0003] Patent CN105784206B discloses a multi-point wall-attached three-dimensional mining stress monitoring device and method for the entire deep borehole. It employs a monitoring component capable of moving towards the borehole wall to achieve wall-attachment, providing a technical approach for establishing stable coupling between the monitoring component and the borehole wall. However, multi-parameter monitoring in rock-breaking tests requires the simultaneous deployment of pressure, vibration, and temperature sensors with different measurement mechanisms. Different sensors have varying requirements regarding borehole wall contact, mechanical force transmission, and protection methods.

[0004] Existing unidirectional push-type in-hole expansion structures may not reliably retract their radial components after the push force is released, especially under conditions of hole wall dust, large wall-adhesive pre-tightening forces, or localized jamming. Furthermore, if different sensors are directly fixed to the same type of exposed bracket, the PVDF piezoelectric film is susceptible to friction and compression damage, the accelerometer body may directly bear the shear force of the hole wall, and the thermocouple sensing end may struggle to maintain stable thermal contact. In addition, different test holes may use different diameters; simply increasing the radial stroke of the slider for adaptation would significantly increase the size of the ring seat and drive structure. Therefore, it is necessary to provide a compact positioning device that can be operated from the hole opening, actively expands and retracts, achieves fixed-depth orientation, and is adaptable to different sensors and hole diameters. Utility Model Content

[0005] The main purpose of this utility model is to provide a multi-parameter sensor positioning device for rock breaking tests in boreholes, so as to solve the problems of unstable wall-attached positioning structure of existing borehole sensor positioning structures and insufficient reliability of radial positioning component recovery after the test; and further solve the problems of mismatch between different sensor installation methods, insufficient reproducibility of installation depth and circumferential orientation, and inconvenience in adapting to different borehole diameters.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A multi-parameter sensor positioning device for rock breaking tests includes a central support tube, a sensor integrated ring seat, a main slider, a wall-adhering shoe, a drive cone, a drive rod, and a locking retainer. The sensor integrated ring seat is sleeved on the central support tube and has multiple radial grooves along its circumference. The main slider is slidably disposed in the corresponding radial groove, and its outer end is detachably connected to the wall-adhering shoe. The drive rod is driven by the drive cone and is used to drive the drive cone to reciprocate along the central support tube axially. The drive cone has an inclined guide groove corresponding to the main slider, and the inner end of the main slider has a guide pin embedded in the corresponding inclined guide groove. The guide pin is bidirectionally limited by the groove walls on both sides of the inclined guide groove, so that when the drive cone reciprocates axially, it drives the main slider to extend radially or be forcibly retracted. The locking retainer is used to restrict the movement of the drive cone or drive rod in the retraction direction after adhering to the wall.

[0008] Furthermore, the radial grooves and main sliders are all set to four and distributed at 90° intervals along the circumference of the sensor integrated ring seat, corresponding to the 0°, 90°, 180° and 270° orientations respectively; the drive cone is provided with four inclined guide grooves along the circumference corresponding to the four main sliders, and each main slider is provided with a guide pin that cooperates with the corresponding inclined guide groove, so that the four main sliders extend radially synchronously or retract synchronously with the axial movement of the drive cone.

[0009] Furthermore, the drive rod is driven by the drive cone via a transmission thread; a circumferential anti-rotation and axial sliding guide structure is provided between the inner hole of the drive cone and the central support tube to form a circumferential anti-rotation axial guide pair; the inclined guide groove adopts a limiting inclined groove that can form a bidirectional limit on the guide pin through the groove walls on both sides and restrict the guide pin from falling out; the locking retainer is provided on the threaded section of the drive rod for axial locking of the drive position.

[0010] The axial guide pair for circumferential anti-rotation adopts a flat-hole fit, the limiting groove adopts a closed groove, and the locking retainer adopts a self-locking nut; in other embodiments, the axial guide pair for circumferential anti-rotation can also adopt an axial keyway-guide key fit, the limiting groove can adopt a groove with an anti-disengagement limiting structure, and the locking retainer can adopt a locking member that can be operated from the orifice.

[0011] Furthermore, the central support tube is provided with an axial depth scale, and the sensor integrated ring seat is positioned at a predetermined axial position of the central support tube by an axial limiting member; a circumferential anti-rotation structure is provided between the central support tube and the sensor integrated ring seat, and an orientation reference mark is provided for indicating the circumferential installation orientation; a push connector is provided at the end of the central support tube.

[0012] Furthermore, in another embodiment, a positioning rod extending axially along the central support tube and arranged parallel to the central support tube is also included; a positioning part is provided on one side of the sensor integrated ring seat, the positioning part forming a positioning hole for the positioning rod to pass through, the positioning rod being able to move axially relative to the positioning hole; a first limiting sleeve and a second limiting sleeve are respectively provided at two predetermined axial positions of the positioning rod, the first limiting sleeve and the second limiting sleeve are respectively located on both sides of the positioning part, and can respectively abut against the two opposite limiting end faces of the positioning part, so as to restrict the sensor integrated ring seat from moving relative to the positioning rod in two opposite directions.

[0013] Furthermore, both the first limiting sleeve and the second limiting sleeve can be C-shaped sleeves with radial openings and can be detachably fitted onto the positioning rod, so that they can be inserted or removed from the radial side of the positioning rod without disassembling the positioning rod.

[0014] Furthermore, the wall-mounting shoe forms a detachable universal mounting interface with the main slider through a connector; wall-mounting shoes with different outer arc radii and different effective radial heights are configured for the φ90 mm monitoring hole and the φ115 mm monitoring hole, respectively. The two types of wall-mounting shoes have the same mounting interface and can be detachably connected to the main slider of the same specification through the connector to adapt to the corresponding hole diameter.

[0015] Furthermore, at least one of the wall-mounted boots is a PVDF wall-mounted boot, the PVDF wall-mounted boot is provided with a limiting cavity, a PVDF piezoelectric film is provided in the limiting cavity, and a thin force-transmitting sheet is provided on the hole wall side of the PVDF piezoelectric film.

[0016] Furthermore, at least one of the wall-mounting boots is an accelerometer wall-mounting boot, which has a cavity in which a triaxial accelerometer is installed, and the side of the accelerometer wall-mounting boot facing the hole wall forms an arc-shaped wall-mounting surface.

[0017] Furthermore, at least one of the wall-mounted boots is a thermocouple wall-mounted boot, which is provided with a thermally conductive contact head, and has a thermocouple and an anti-detachment pressure block for fixing the temperature measuring end of the thermocouple inside.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects:

[0019] 1. This utility model forms a transmission relationship through a driving cone, an inclined guide groove, and a guide pin, which can push the main slider forward and bring it back in the reverse direction. Compared with structures that rely solely on elastic reset or self-retraction, this can improve the reliability of recovery after the test.

[0020] 2. This utility model uses locking retainers to maintain the position of the drive cone or drive rod, which helps the wall-attaching shoe maintain a stable wall-attaching state during rock-breaking vibration. Through axial depth scale, axial limiting components, circumferential anti-rotation structure and orientation reference marks, the device can be installed at a fixed depth and in an oriented manner, improving the consistency of the sensor's spatial position during repeated tests.

[0021] 3. This utility model sets up different wall-mounted support structures for PVDF piezoelectric films, triaxial accelerometers and thermocouples, so that each sensor can obtain hole wall coupling while reducing the direct friction, compression or shearing of the sensitive element by the hole wall;

[0022] 4. This utility model can improve the hole diameter adaptability of the device by replacing the wall-mounted shoe with different outer arc and radial effective height to adapt to different hole diameters, while maintaining the commonality of the main slider and the main body drive mechanism;

[0023] 5. In this utility model, the positioning rod passes through the positioning hole on the sensor integrated ring seat. The first limiting sleeve and the second limiting sleeve are respectively limited and set at two predetermined axial positions of the positioning rod, and are located on both sides of the positioning part and abut against the corresponding limiting end face, which can form two clear mechanical limits in opposite directions. When a C-shaped limiting sleeve with a radial opening is used, the lateral installation and removal of the limiting sleeve can also be realized without disassembling the positioning rod, which is beneficial to improving the convenience of auxiliary positioning, bidirectional limiting and repeated installation and the position reproducibility. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0025] Figure 2 This is a top view of the sensor integrated ring seat and radial slider of this utility model;

[0026] Figure 3 This is a schematic diagram of the working state of the expansion and contraction mechanism of this utility model;

[0027] Figure 4 This is a cross-sectional view of the driving and locking structure of this utility model;

[0028] Figure 5 Schematic diagrams of different sensor wall-mounted boot structures of this utility model;

[0029] Figure 6 A schematic diagram illustrating the adaptation of the wall-mounted boots with different aperture sizes according to this utility model;

[0030] Figure 7 This is a schematic diagram of the depth-fixing, orientation-setting, and anti-rotation structure of this utility model;

[0031] Figure 8 This is a schematic diagram of the installation state inside the hole of this utility model;

[0032] Figure 9 This is a schematic diagram of the positioning rod and bidirectional limiting structure in another embodiment of the present invention.

[0033] In the diagram: 1-Central support tube; 2-Sensor integrated ring seat; 4-PVDF piezoelectric film; 5-Triaxial accelerometer; 7-Thermocouple; 8-Monitoring borehole; 9-Liquid gas rock-breaking hole; 12-Axial depth scale; 13-Axial limiting component; 15-Push connector; 16-Circumferential anti-rotation structure; 17-Azimuth reference mark; 18-Positioning rod; 181-First limiting sleeve; 182-Second limiting sleeve; 23-Radial groove; 31-Main slider; 32-Wall shoe; 33-Connector; 34-Drive cone; 35-Guide pin; 36-Drive rod; 37-Transmission thread; 38-Locking retainer; 211-Limiting cavity; 212-Thin force transmission plate; 221-Cavity; 222-Arc-shaped wall surface; 241-Heat-conducting contact head; 242-Anti-detachment pressure block; 341-Inclined guide groove. Detailed Implementation

[0034] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are used to illustrate the structural relationships and working process of the present invention and are not intended to limit the scope of protection of the present invention. Without changing the basic technical concept of the present invention, those skilled in the art can make conventional adjustments to the local connection forms, dimensions, and materials.

[0035] like Figure 1 and Figure 2 As shown, the borehole multi-parameter sensor positioning device for rock breaking tests in this embodiment includes a central support tube 1, a sensor integrated ring seat 2, four main sliders 31, and wall-mounting boots 32 respectively installed on the outer ends of the main sliders 31. The central support tube 1 extends axially along the device to form the main support of the device and serves as the axial reference when the device is inserted into the monitoring borehole 8. An axial depth scale 12 is provided on the surface of the central support tube 1 to facilitate the installer to confirm the axial position of the device or the sensor integrated ring seat 2 according to the test requirements; a push connector 15 is provided at one end of the central support tube 1 for connection with a push rod or other insertion tool.

[0036] The sensor integrated ring seat 2 is fitted onto the working area of ​​the central support tube 1. The sensor integrated ring seat 2 forms four radial grooves 23 along its circumference, corresponding to 0°, 90°, 180°, and 270° orientations respectively. Each radial groove 23 contains a main slider 31. Guided by the radial grooves 23, the main slider 31 can only reciprocate radially relative to the sensor integrated ring seat 2. A uniform mounting position is provided at the outer end of the main slider 31, and a wall-mounting shoe 32 is detachably connected to the main slider 31 via a connector 33. The connector 33 can be a threaded fastener or a connector with an equivalent detachable function, allowing for replacement of the corresponding wall-mounting shoe 32 according to the monitoring parameters or the diameter of the monitoring hole.

[0037] like Figure 3 (a) The device in its expanded state and Figure 3 (b) As shown in the retracted state of the device, the drive cone 34 is located in the internal area of ​​the sensor integrated ring seat 2 and can move axially relative to the central support tube 1. The drive cone 34 has four inclined guide grooves 341 corresponding to the four main sliders 31 along its circumference, and each main slider 31 has a guide pin 35 at its inner end. The guide pin 35 is embedded in the corresponding inclined guide groove 341. The inclined guide groove 341 is either a closed inclined groove or a limiting inclined groove that restricts the guide pin 35 from dislodging, so that the guide pin 35 is bidirectionally constrained by the groove walls on both sides of the groove. The guiding direction and effective stroke of the four inclined guide grooves 341 correspond to each other. When the drive cone 34 moves in the tightening direction, each inclined guide groove 341 pushes the corresponding guide pin 35 outward, and the four main sliders 31 extend synchronously along the radial groove 23. When the drive cone 34 moves in the opposite direction, the other side of the inclined guide groove 341 pulls back the guide pin 35, causing the four main sliders 31 to retract synchronously and actively, thereby causing the wall-mounted shoe 32 to disengage from the hole wall.

[0038] The aforementioned bidirectional transmission relationship ensures that the retraction of the main slider 31 does not entirely rely on the friction between the wall-mounted shoe 32 and the borehole wall to release itself, nor does it entirely rely on the reset of elastic components such as springs. When there is dust, rough surface, or local unevenness on the borehole wall, the operator can still use the reverse movement of the drive cone 34 to apply a retraction force to the main slider 31, thereby reducing the risk of the device getting stuck in the monitoring borehole 8.

[0039] like Figure 4As shown, the drive rod 36 extends axially along the device and is connected to the drive cone 34 via a transmission thread 37 in this embodiment. A circumferentially anti-rotation and axially sliding guide structure is provided between the inner hole of the drive cone 34 and the central support tube 1 to form a circumferentially anti-rotation axial guide pair; for example, a flat-hole fit or an axial keyway-guide key fit can be used, allowing the drive cone 34 to move axially along the central support tube 1 without rotating relative to it. Therefore, when the operator rotates the drive rod 36 at the orifice, the transmission thread 37 converts the rotational motion into axial displacement of the drive cone 34, thereby completing the tightening or retraction operation of the main slider 31.

[0040] After the main slider 31 extends radially and the wall-adhering shoe 32 reaches the predetermined wall-adhering state, the locking retainer 38 restricts the movement of the drive cone 34 or drive rod 36 in the retraction direction. In a preferred embodiment, the locking retainer 38 is a self-locking nut provided on the corresponding threaded section of the drive rod 36. After tightening to the desired position, the self-locking nut is tightened to apply an axial retaining effect directly or through the limiting end face to the drive cone 34, thereby preventing the drive cone 34 from retracting under vibration. In other embodiments, a locking member operable through an orifice can also be used to achieve equivalent axial locking. After the test, the locking retainer 38 is released first, and then the drive rod 36 is operated in the reverse direction to make the drive cone 34 move in the reverse direction and actively retract the main slider 31.

[0041] like Figure 5 As shown, different types of sensors employ different wall-mounted shoe structures. Figure 5 In (a) of the PVDF wall-mounted shoe, a limiting cavity 211 is provided, and a PVDF piezoelectric film 4 is disposed in the limiting cavity 211. A thin force transmission plate 212 is disposed on the side of the PVDF piezoelectric film facing the hole wall. After the device is tightened, the thin force transmission plate 212 contacts the hole wall and transmits the dynamic force on the hole wall to the PVDF piezoelectric film 4, while avoiding direct friction between the flexible PVDF piezoelectric film 4 and the rough hole wall.

[0042] Figure 5 In (b) of the accelerometer, a cavity 221 is formed inside the wall-mounted shoe, and the triaxial accelerometer 5 is installed and fixed inside the cavity 221. An arc-shaped wall-mounted surface 222 is formed on the side of the wall-mounted shoe facing the borehole wall. The arc-shaped wall-mounted surface 222 is used to bear the wall-mounted pressure and form a large rigid contact area with the borehole wall. The vibration of the borehole wall is transmitted to the triaxial accelerometer 5 through the rigid wall-mounted shoe body, which can reduce the direct pressure and tangential scraping of the housing of the triaxial accelerometer 5 on the borehole wall.

[0043] Figure 5(c) The thermocouple mounting shoe is equipped with a thermally conductive contact head 241. The temperature measuring end of the thermocouple 7 is located at the position where it is thermally connected to the thermally conductive contact head 241 and is fixed by an anti-detachment pressure block 242. The thermally conductive contact head 241 protrudes relative to the outer surface of the mounting shoe, so that when the device is tightened, the thermally conductive contact head 241 can stably contact the hole wall, thereby transferring the temperature of the hole wall to the temperature measuring end of the thermocouple 7. The signal lines of each sensor can be led out from the lead space in the corresponding mounting shoe 32 and enter the sensor integrated ring seat 2 along the reserved wire space of the main slider 31 or arranged along the central support tube 1 towards the orifice. A flexible bending allowance is reserved in the radial movement area of ​​the main slider 31 to avoid the signal lines bearing significant tensile loads during the extension and retraction of the main slider 31.

[0044] like Figure 6 As shown in (a) and (b) of this embodiment, different specifications of replaceable wall-mounting shoes 32 are set for different monitoring hole diameters. The wall-mounting shoes for φ90 mm monitoring holes and the wall-mounting shoes for φ115 mm monitoring holes are both connected to the universal main slider 31 through the connector 33. They have the same installation interface and can be detachably connected to the main slider 31 of the same specification. The outer arc design radii of the two wall-mounting shoes 32 are denoted as R1 and R2, respectively. The radial effective heights from the installation reference of the main slider 31 to the outer surface of the wall are denoted as H1 and H2, respectively, and satisfying R1≠R2 and H1≠H2. R1 and R2 are determined according to the curvature of the corresponding monitoring hole wall, the installation gap and the wall-mounting preload, and are not necessarily equal to the nominal diameter or nominal radius of the monitoring hole. Therefore, the large nominal aperture difference between the φ90 mm and φ115 mm monitoring holes is mainly compensated by the difference in the outer arc and radial effective height of the wall-mounted shoe 32 itself, while the main slider 31 only needs to provide the radial movement stroke required for installation gap conversion, actual aperture deviation compensation and wall-mounted pre-tightening.

[0045] like Figure 7 As shown in (a), a circumferential anti-rotation structure 16 is provided between the central support tube 1 and the sensor integrated ring seat 2. In this embodiment, a non-circular fit, flat position, or keyway structure can be used to restrict the rotation of the sensor integrated ring seat 2 relative to the central support tube 1. After the sensor integrated ring seat 2 reaches the target depth position, it is axially positioned by an axial limiting member 13. The axial limiting member 13 can be a locking ring sleeved on the central support tube 1, and the locking ring is fixed to the central support tube 1 by a set screw or an equivalent clamping structure. The orientation reference mark 17 corresponds to the predetermined 0° orientation. During installation, the circumferential direction of the sensor integrated ring seat 2 and its main sliders 31 is determined by the orientation reference mark 17, so that the measurement direction of different sensors corresponds to the test coordinate direction.

[0046] In a preferred arrangement, such as Figure 7As shown in (b), the wall-mounted shoe 32 at 0° and 90° is used to arrange the PVDF piezoelectric film 4, the wall-mounted shoe 32 at 180° is used to arrange the triaxial accelerometer 5, and the wall-mounted shoe 32 at 270° is used to arrange the thermocouple 7. This orientation allocation can be adjusted according to the specific test purpose, but in a single test or multiple tests that require comparison, the orientation reference mark 17 should be used as the circumferential position reproduction reference.

[0047] like Figure 9 As shown, in another embodiment, the device further includes a positioning rod 18. The positioning rod 18 extends axially along the central support tube 1 and is arranged parallel to the central support tube 1, serving to form an auxiliary axial positioning reference parallel to the central support tube 1. A positioning part is provided on one side of the sensor integrated ring seat 2, the positioning part being part of the sensor integrated ring seat 2. A positioning hole is formed on the positioning part for the positioning rod 18 to pass through, the positioning rod 18 passing through the positioning hole and being able to move axially relative to the positioning hole. A first limiting sleeve 181 and a second limiting sleeve 182 are respectively provided at two predetermined axial positions of the positioning rod 18, the first limiting sleeve 181 and the second limiting sleeve 182 being located on both sides of the positioning part along the axial direction of the positioning rod 18.

[0048] The first limiting sleeve 181 and the second limiting sleeve 182 can respectively abut against the two opposite limiting end faces of the positioning part. When the sensor integrated ring seat 2 moves relative to the positioning rod 18 in one axial direction to the first limiting position, the first limiting sleeve 181 abuts against the limiting end face of the corresponding side of the positioning part; when the sensor integrated ring seat 2 moves in the opposite axial direction to the second limiting position, the second limiting sleeve 182 abuts against the limiting end face of the other side of the positioning part, thereby restricting the sensor integrated ring seat 2 from continuing to move relative to the positioning rod 18 in two opposite directions. Both the first limiting sleeve 181 and the second limiting sleeve 182 can be C-shaped sleeves with radial openings and can be detachably sleeved on the positioning rod 18, so that they can be installed or removed from the radial side of the positioning rod 18 without sequentially inserting them from the end of the positioning rod 18.

[0049] use Figure 9 In the embodiment shown, the first limiting sleeve 181 and the second limiting sleeve 182 can be respectively set at the corresponding axial positions of the positioning rod 18 according to the predetermined positioning range, so that the sensor integrated ring seat 2 can be axially adjusted between the two limiting positions; when the positioning part abuts against the first limiting sleeve 181 or the second limiting sleeve 182, the corresponding limiting sleeve forms a mechanical limit in that direction, so as to help determine the axial position of the sensor integrated ring seat 2 and improve the position reproducibility during repeated installation.

[0050] like Figure 8As shown, during use, the device is inserted into the monitoring borehole 8, which is located beside the liquid gas rock-breaking borehole 9. The distance between the two is determined according to the test setup, for example, it can be set to 3 m to 10 m. After the device is delivered to the target position, the burial depth is determined according to the axial depth scale 12 and the axial limiting component 13, and the circumferential orientation is confirmed according to the orientation reference mark 17. Then, the drive rod 36 is operated in the forward direction, causing the drive cone 34 to drive the four main sliders 31 to move outward until the wall-adhering shoe 32 reliably abuts against the borehole wall of the monitoring borehole 8, and then the locking retainer 38 keeps it in a tightened state.

[0051] After the rock-breaking test is completed, first release the locking retainer 38, then reverse the operation of the drive rod 36 to move the drive cone 34 in the opposite direction. The inclined guide groove 341 exerts an active pull-back effect on the guide pin 35, causing the main slider 31 to retract inward along the radial groove 23, and the wall-adhering shoe 32 to separate from the wall of the monitoring borehole 8. After all the main sliders 31 are in the retracted state, the device is lifted out of the monitoring borehole 8 through the central support tube 1 and the push connector 15.

[0052] The above embodiments are used to illustrate this utility model and do not constitute a limitation thereof. The number of main sliders 31, the type of sensor, the specific material and shape of the wall-mounted shoe 32, the specific connection method of the drive rod 36 and the locking retainer 38, and the specific dimensions and installation positions of the positioning rod 18, the first limiting sleeve 181 and the second limiting sleeve 182 can all be adjusted according to actual monitoring needs; in the positioning rod embodiment, the specific shape of the positioning part and the cross-sectional form of the positioning hole can also be conventionally set according to structural needs. As long as the axial drive radial expansion and contraction, active recovery, fixed depth orientation, replaceable sensor wall-mounted bearing and the auxiliary positioning and bidirectional limiting basic structural relationship in the corresponding embodiments described in this utility model are adopted, they all fall within the scope of the technical concept of this utility model.

Claims

1. A multi-parameter sensor positioning device for borehole testing in rock breaking tests, characterized in that, The system includes a central support tube (1), a sensor integrated ring seat (2), a main slider (31), a wall-mounted shoe (32), a drive cone (34), a drive rod (36), and a locking retainer (38). The sensor integrated ring seat (2) is sleeved on the central support tube (1) and has multiple radial grooves (23) along its circumference. The main slider (31) is slidably disposed in the corresponding radial groove (23), and its outer end is detachably connected to the wall-mounted shoe (32). The drive rod (36) is connected to the drive cone (34) for driving the drive cone (34) along its circumference. The central support tube (1) moves axially back and forth; the drive cone (34) is provided with an inclined guide groove (341) corresponding to the main slider (31), and the inner end of the main slider (31) is provided with a guide pin (35) embedded in the corresponding inclined guide groove (341). The guide pin (35) is bidirectionally limited by the groove walls on both sides of the inclined guide groove (341), so that when the drive cone (34) moves axially back and forth, it drives the main slider (31) to extend radially or be forcibly retracted; the locking retainer (38) is used to restrict the drive cone (34) or drive rod (36) from moving in the retraction direction after it is attached to the wall.

2. The in-hole multi-parameter sensor positioning device for rock breaking tests according to claim 1, characterized in that, The radial groove (23) and the main slider (31) are all set to four and distributed at 90° intervals along the circumference of the sensor integrated ring seat (2), corresponding to the 0°, 90°, 180° and 270° orientations respectively; the driving cone (34) is provided with four inclined guide grooves (341) along the circumference corresponding to the four main sliders (31), and each main slider (31) is provided with a guide pin (35) that cooperates with the corresponding inclined guide groove (341).

3. The in-hole multi-parameter sensor positioning device for rock breaking tests according to claim 1, characterized in that, The drive rod (36) is driven by the drive cone (34) through the transmission thread (37); the inner hole of the drive cone (34) and the central support tube (1) are provided with a circumferential anti-rotation and axial sliding guide structure to form a circumferential anti-rotation axial guide pair, so that the drive cone (34) can move axially along the central support tube (1) without relative rotation; the inclined guide groove (341) is a limiting inclined groove that can form a bidirectional limit on the guide pin (35) through the groove walls on both sides and restrict the guide pin (35) from falling out; the locking retainer (38) is provided on the threaded section of the drive rod (36) and is used to axially lock the drive position.

4. The in-hole multi-parameter sensor positioning device for rock breaking tests according to claim 1, characterized in that, The central support tube (1) is provided with an axial depth scale (12), and the sensor integrated ring seat (2) is positioned at a predetermined axial position of the central support tube (1) by an axial limiting member (13); a circumferential anti-rotation structure (16) is provided between the central support tube (1) and the sensor integrated ring seat (2), and an orientation reference mark (17) for indicating the circumferential installation orientation is provided; a push connector (15) is provided at the end of the central support tube (1).

5. The in-hole multi-parameter sensor positioning device for rock breaking tests according to claim 1, characterized in that, The wall-mounting shoe (32) forms a detachable universal installation interface with the main slider (31) through the connector (33); wall-mounting shoes (32) with different outer arc radii and different radial effective heights are configured for the φ90 mm monitoring hole and the φ115 mm monitoring hole, respectively. The two wall-mounting shoes (32) have the same installation interface and can be detachably connected to the main slider (31) of the same specification through the connector (33) to adapt to the corresponding hole diameter.

6. The in-hole multi-parameter sensor positioning device for rock breaking tests according to claim 1, characterized in that, At least one of the wall-mounted boots (32) is a PVDF wall-mounted boot. The PVDF wall-mounted boot is provided with a limiting cavity (211). A PVDF piezoelectric film (4) is provided in the limiting cavity (211). A thin force transmission plate (212) is provided on the hole wall side of the PVDF piezoelectric film (4).

7. The in-hole multi-parameter sensor positioning device for rock breaking tests according to claim 1, characterized in that, At least one of the wall-mounting boots (32) is an accelerometer wall-mounting boot, which has a cavity (221) and a triaxial accelerometer (5) installed inside the cavity (221). The side of the accelerometer wall-mounting boot facing the hole wall forms an arc-shaped wall-mounting surface (222).

8. The in-hole multi-parameter sensor positioning device for rock breaking tests according to claim 1, characterized in that, At least one of the wall-mounted boots (32) is a thermocouple wall-mounted boot, which is provided with a thermally conductive contact head (241), and has a thermocouple (7) and an anti-detachment pressure block (242) for fixing the temperature measuring end of the thermocouple (7) inside.

9. The in-hole multi-parameter sensor positioning device for rock breaking tests according to claim 1, characterized in that, It also includes a positioning rod (18) that extends axially along the central support tube (1) and is arranged parallel to the central support tube (1); a positioning part is provided on one side of the sensor integrated ring seat (2), the positioning part forms a positioning hole through which the positioning rod (18) passes, and the positioning rod (18) can move axially relative to the positioning hole; a first limiting sleeve (181) and a second limiting sleeve (182) are respectively provided at two predetermined axial positions of the positioning rod (18), the first limiting sleeve (181) and the second limiting sleeve (182) are respectively located on both sides of the positioning part, and can respectively abut against the two opposite limiting end faces of the positioning part, so as to restrict the sensor integrated ring seat (2) from moving relative to the positioning rod (18) in two opposite directions.

10. The in-hole multi-parameter sensor positioning device for rock breaking tests according to claim 9, characterized in that, The first limiting sleeve (181) and the second limiting sleeve (182) are both C-shaped sleeves with radial openings and can be detachably fitted onto the positioning rod (18). The radial openings are used to allow the first limiting sleeve (181) and the second limiting sleeve (182) to be inserted into or removed from the radial side of the positioning rod (18).

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