A mining pressure sensor mounting structure

Abstract

This utility model discloses a mine pressure sensor installation structure, relating to the technical field of mine or tunnel safety auxiliary devices. It includes a push rod assembly comprising multiple rods connected sequentially, with adjacent rods connected by a universal joint. The beneficial effects of this utility model are: through the coordinated operation of the push rod assembly, universal joint, limiting baffle, and elastic centralizer, a rigid-flexible composite follow-up guiding structure is formed. During the pushing process, the limiting baffle and elastic centralizer together enclose a controllable deflection space. When the borehole deviates, it not only restricts the universal joint from bending and locking, but also utilizes the compressive deformation of the elastic centralizer to generate a reverse reset torque and conform to the borehole wall to form flexible support, thereby correcting the rod posture to adapt to borehole path deviation, reducing the risk of stuck drill and pushing resistance, and achieving stable and accurate installation of the mine pressure sensor in complex boreholes.

Description

Technical Field

[0001] This utility model relates to the technical field of safety auxiliary devices for mines or tunnels, specifically a mine pressure sensor mounting structure. Background Technology

[0002] In underground engineering fields such as coal mine roadways and tunnels, mine pressure sensors (such as insertion stress gauges) are core equipment for monitoring changes in rock mass stress and providing early warnings of disasters such as roof falls and rockbursts. They sense rock mass stress and convert it into electrical signals, providing crucial data support for safe and efficient construction. These sensors need to be inserted into the rock mass at a predetermined depth through drilling, and their installation stability directly affects monitoring accuracy and early warning reliability.

[0003] However, in complex geological environments such as underground coal mines, borehole trajectory deviations are prone to occur due to factors such as formation anisotropy, drill bit mechanical properties, and construction techniques, making it difficult to maintain the designed straight trajectory. Existing mine pressure sensors often rely on rigid push rods for installation, lacking angle adjustment capabilities. During insertion, they are prone to rigid collisions with deviations in the borehole, leading to frequent jamming problems, which not only increase insertion resistance but also reduce installation efficiency. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a mine pressure sensor mounting structure.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows: A mine pressure sensor mounting structure includes a push rod assembly comprising a plurality of rods connected in sequence, adjacent rods being connected by a universal joint, and an adapter head for connecting a mine pressure sensor is provided at the end of the rod located at the push end. At least one guide and limiting component is sleeved on the rod body and disposed near the universal joint, comprising: An adjusting sleeve is axially adjustable on the rod body via a locking structure; Multiple limiting baffles are distributed at intervals along the circumference of the adjusting sleeve and extend outward at an angle toward the universal joint to form a rigid limiting space that restricts the maximum deflection angle of the universal joint. Multiple elastic straightening plates are connected to the ends of the limiting baffles in a one-to-one correspondence, and the straightening plates are inclined inward from the connection point towards the axis of the rod. The end of the elastic straightening plate has an outwardly turned contact portion, and at least a portion of the contact portion is located outside the radial projection of the rod when the rod is in a non-deflected state.

[0006] Preferably, the contact portion is provided with a support section. When the contact portion is deformed by the compression of the rod, it contacts the inner wall of the borehole through the support section to increase the contact area.

[0007] Preferably, the radial length of the contact portion and the radial length of the end of the limiting baffle are both less than the maximum outer diameter of the mine pressure sensor.

[0008] Preferably, the contact surface between the support section and the inner wall of the borehole is provided with friction-enhancing texture.

[0009] Preferably, the locking structure includes a screw hole on the rod body, a plurality of adjusting holes axially formed along the adjusting sleeve, and a bolt that passes through the corresponding adjusting hole and is threadedly connected to the screw hole.

[0010] Preferably, it also includes a fixing sleeve, which can be selectively fitted onto the outside of the connection between two adjacent rods to restrict the degree of freedom of movement of the universal joint.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: through the coordinated cooperation of the push rod assembly, universal joint, limit baffle and elastic centering plate, a rigid-flexible composite follow-up guide structure is formed. During the pushing process, the limit baffle and elastic centering plate together enclose a controllable deflection space. When the borehole deviates, it not only restricts the universal joint from bending and locking, but also uses the compression deformation of the elastic centering plate to generate a reverse reset torque and form a flexible support against the borehole wall, thereby correcting the rod posture to adapt to the borehole path deviation, reducing the risk of stuck drill and pushing resistance, and realizing the stable and accurate installation of the mine pressure sensor in complex boreholes. Attached Figure Description

[0012] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts. Wherein: Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a partial structural schematic diagram of the present invention; Figure 3 This is a schematic diagram of the connection structure of the rod body of this utility model; Figure 4 This is a schematic diagram of the guide and limiting component in this utility model; Figure 5 This is a schematic diagram of the structure of the limiting baffle and the straightening plate in this utility model; Figure 6 This is a side sectional view of the present invention; Figure 7 This is a schematic diagram of the adapter head in this utility model.

[0013] The diagram shows the following labels: 1. Rod body; 11. Adapter head; 2. Universal joint; 3. Guide and limit assembly; 31. Adjustment sleeve; 311. Adjustment hole; 32. Limiting plate; 33. Straightening plate; 331. Support section; 4. Fixing sleeve. Detailed Implementation

[0014] It is readily understood that, based on the technical solution of this utility model, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of this utility model. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on the technical solution of this utility model.

[0015] Example like Figures 1 to 7 As shown, this embodiment provides a mine pressure sensor installation structure, which is mainly used in underground coal mine drilling to push the mine pressure sensor to a predetermined hole depth and actively adapt to the deviation path of the borehole during the pushing process to ensure that the sensor is installed in place and is not damaged.

[0016] The installation structure mainly consists of two parts: the push rod assembly and the guide limit assembly.

[0017] The push rod assembly comprises multiple rods 1 connected in sequence. The rod 1 is preferably a hollow or solid round metal rod, but can also be a square or hexagonal rod to accommodate the clamping requirements of downhole drilling rigs or manual pushing. Adjacent rods 1 are movably connected by a universal joint 2. The universal joint 2 can be a cross-type or a ball-cage type, and its function is to allow a certain angle of relative deflection between adjacent rods 1, thereby enabling the entire push rod assembly to adapt to irregular paths such as bends and deviations within the borehole.

[0018] An adapter head 11 is detachably mounted on the end of the rod body 1 (i.e., the push end) at the very front of the entire push rod assembly. The other end of the adapter head 11 is customized according to the specific model of the mine pressure sensor and the tail interface form. For example, it can be equipped with internal threads, external threads, cross slots, or quick-connect connectors to ensure that the mine pressure sensor is reliably connected to the push rod assembly and does not fall off during the pushing process.

[0019] To address the problems of traditional pushing devices such as jamming in skewed drilling, high pushing resistance, and easy damage to the universal joint 2 due to bending, this device adds a guide and limiting component 3 to the rod 1. At least one of these components is provided, and it is preferably installed close to the universal joint 2 to control the deflection behavior of the universal joint 2.

[0020] The guide limit component 3 specifically includes: Adjusting sleeve 31 is a sleeve-shaped part with an axial through hole. The cross-sectional shape of its inner hole matches the outer contour of the rod 1, so that it can be slidably fitted onto the rod 1. The adjusting sleeve 31 is adjusted and fixed in the axial position of the rod 1 by a locking structure.

[0021] In this embodiment, the locking structure includes a screw hole on the side wall of the rod 1, multiple adjusting holes 311 axially formed along the adjusting sleeve 31, and bolts as fasteners. During installation, the operator can slide the adjusting sleeve 31 axially along the rod 1 to a suitable position according to the actual range of motion requirements of the universal joint 2, aligning the adjusting holes 311 with the screw holes on the rod 1, and then screwing in the bolts to lock them in place. By selecting different adjusting holes 311, the axial distance between the adjusting sleeve 31 and the rotation center of the universal joint 2 can be flexibly changed, thereby adjusting the size of the limiting space formed by the limiting baffles 32 described below.

[0022] Multiple limiting baffles 32 are distributed circumferentially along the adjusting sleeve 31, with their roots integrally formed with the front end face of the adjusting sleeve 31 or fixedly connected by welding, riveting, or other methods. The limiting baffles 32 extend outward from their roots toward the universal joint 2, meaning that the radial distance from their free ends to the axis of the rod 1 is greater than the radial distance from their roots. The free ends of the multiple limiting baffles 32 together form a rigid limiting space in the shape of a trumpet. This space accommodates the movable end of the universal joint 2 (i.e., the fork or ball cage part connected to the previous rod 1). When the push rod assembly encounters bending in the borehole, the deflection angle of the universal joint 2 is blocked by the inner wall of the limiting baffles 32, effectively preventing motion dead points or structural damage caused by the universal joint 2 bending too much.

[0023] The elastic centering plates 33 correspond one-to-one with the limiting plates 32 and are connected to the free ends of the limiting plates 32. The centering plates 33 are made of materials with good elasticity and fatigue resistance, such as spring steel strips or beryllium bronze sheets. From the point of connection with the limiting plates 32, the centering plates 33 slope inward toward the axis of the rod 1, that is, their free ends gradually approach the axis of the rod 1.

[0024] Furthermore, the end of the straightening piece 33 is bent to form an outwardly turned contact portion. This contact portion has an arc-shaped or planar support section 331. When the rod 1 is in a straight, undeflected state, at least a portion of this contact portion (especially the support section 331) protrudes radially beyond the outer contour projection of the rod 1.

[0025] To enhance the stability of the support section 331 when in contact with the borehole wall, a friction-enhancing texture, such as knurling, weave, or inlaid wear-resistant rubber pads, can be further provided on the contact surface of the support section 331. The friction-enhancing texture can prevent the elastic centralizer 33 from slipping along the borehole wall when subjected to axial thrust, ensuring the reliability of the guiding function.

[0026] In addition, such as Figure 6 As shown, the maximum radial dimension of the contact portion (i.e., the distance from the support section 331 to the axis) and the maximum radial dimension of the end of the limiting baffle 32 are both designed to be smaller than the maximum outer diameter of the mine pressure sensor. The significance of this dimensional constraint is that during the pushing process, no part of the guide limiting component 3 will violently scrape or jam against the hole wall before the mine pressure sensor, ensuring that the orifice passage is determined by the sensor with the largest size, protecting the guide limiting component 3 itself from damage, and also avoiding the problem of not being able to be fed into the specified orifice due to the component's outer diameter being too large.

[0027] To increase the overall rigidity of the push rod assembly in conditions where the universal joint 2 does not require movement (such as during initial feeding or traversing extremely fractured zones), the device also provides a retaining sleeve 4. The retaining sleeve 4 is a rigid sleeve with an inner diameter slightly larger than the outer diameter of the rod body 1, and its length is sufficient to cover the connection between two adjacent rod bodies 1 and the exposed portion of the universal joint 2. When temporary locking of the universal joint 2 is required, the operator can slide the retaining sleeve 4 along the rod body 1, simultaneously covering the connection ends of the front and rear rod body sections 1. Set screws or bolts can be installed at both ends of the retaining sleeve 4 to fix it relative to the rod body 1. At this time, the universal joint 2 is completely constrained within the inner cavity of the retaining sleeve 4 and cannot deflect. The entire push rod assembly temporarily transforms into a rigid rod, facilitating the application of larger axial thrust or rotary drilling under complex conditions.

[0028] Based on actual downhole pushing operations, the functions and effects of the above structure are explained as follows: When the operator pushes rod 1 into the borehole using a drilling rig or manually, if the borehole is relatively straight, the universal joint 2 hardly deflects, and the entire push rod assembly is approximately a rigid straight rod, resulting in high thrust transmission efficiency. At this time, the contact part of the straightening plate 33 may lightly touch the inner wall of the borehole, thus straightening rod 1 and preventing it from scraping the wall due to gravity.

[0029] When the front end of the push rod assembly encounters the deflection section of the borehole (i.e., the area where the borehole axis bends), the universal joint 2 is forced to deflect, and the preceding rod section 1 connected to it immediately swings at an angle relative to the following rod section 1. During the swinging process, the side wall of rod 1 presses against the centralizing plate 33 located on the side of the deflection direction; the centralizing plate 33 undergoes elastic bending deformation after being pressed by rod 1, and at the same time, the support section 331 on the contact part moves outward synchronously and eventually fits against the inner wall of the borehole. At this time, the centralizing plate 33 becomes an "elastic diagonal brace" supporting the borehole wall and rod 1. On the one hand, it restricts rod 1 from getting closer to the side wall of the borehole, preventing rod 1 from scraping the borehole wall and causing borehole collapse or coal dust accumulation; on the other hand, the inclined and inward posture makes the axial component of the supporting force help guide rod 1 towards the center of the borehole, assisting the push rod assembly in adjusting its posture to smoothly pass through the bending section.

[0030] In summary, this device, through the rigid-flexible composite structure design of the rigid limiting baffle 32 and the centralizing plate 33, not only achieves safe limiting of the deflection angle of the universal joint 2, but also, through the unique outward-curving contact part at the end of the centralizing plate 33, constructs a follow-up elastic guiding and reset mechanism when the push rod assembly deflects. This structure improves the passability and operational stability of the push rod assembly in skewed boreholes without manual intervention, effectively ensuring the efficient and accurate installation of the mine pressure sensor.

[0031] The technical scope of this utility model is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the protection scope of this utility model.

Claims

1. A mine pressure sensor mounting structure, characterized in that, include: The push rod assembly includes a plurality of rods connected in sequence, adjacent rods are connected by a universal joint, and the end of the rod located at the push end is provided with an adapter for connecting a mine pressure sensor; At least one guide and limit component, comprising: An adjusting sleeve is axially adjustable on the rod body via a locking structure; Multiple limiting baffles are distributed at intervals along the circumference of the adjusting sleeve and extend outward at an angle toward the universal joint to form a rigid limiting space that restricts the maximum deflection angle of the universal joint. Multiple elastic straightening plates are connected to the ends of the limiting baffles in a one-to-one correspondence, and the straightening plates are inclined inward from the connection point towards the axis of the rod. The end of the elastic straightening plate has an outwardly turned contact portion, and at least a portion of the contact portion is outside the radial projection of the rod.

2. The installation structure for a mine pressure sensor according to claim 1, characterized in that: The contact portion is provided with a support section. When the contact portion is deformed by the pressure of the rod, it contacts the inner wall of the borehole through the support section to increase the contact area.

3. The installation structure for a mine pressure sensor according to claim 2, characterized in that: The radial length of the contact portion and the radial length of the end of the limiting baffle are both less than the maximum outer diameter of the mine pressure sensor.

4. The installation structure for a mine pressure sensor according to claim 2, characterized in that: The contact surface between the support section and the inner wall of the borehole is provided with friction-enhancing texture.

5. The installation structure for a mine pressure sensor according to claim 1, characterized in that: The locking structure includes a screw hole on the rod body, a plurality of adjustment holes along the axial direction of the adjustment sleeve, and a bolt that passes through the corresponding adjustment hole and is threaded to the screw hole.

6. The installation structure for a mine pressure sensor according to claim 1, characterized in that: It also includes a fixing sleeve, which can be selectively fitted onto the outside of the connection between two adjacent rods to restrict the degree of freedom of movement of the universal joint.

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