Buckle type multipoint displacement meter

Abstract

The utility model discloses a buckle type multipoint displacement meter, which relates to the technical field of engineering deformation monitoring equipment, and comprises a displacement sensor arranged in an outer protective tube, and the displacement sensor is provided with a sensor shell, a displacement detection spring and a threaded adapter connected with the spring; the buckle assembly is used for detachably and axially positioning the sensor shell in the outer protective tube; the sensor spring protection structure comprises a strip-shaped limiting hole which is formed in the sensor shell along the axial direction; and the limiting piece is fixed on the threaded adapter and is movably matched in the limiting hole. According to the utility model, the sensor can be quickly assembled and disassembled, the maintenance efficiency is improved, re-drilling is not needed, in addition, the sensor can be protected from being damaged by outrange displacement, and the durability of equipment is enhanced.

Description

Technical Field

[0001] This utility model belongs to the technical field of engineering deformation monitoring equipment, specifically relating to a snap-on multi-point displacement meter for deformation monitoring of engineering structures such as slopes and tunnels. Background Technology

[0002] In existing technologies, rod-type multi-point displacement gauges are widely used. They typically consist of a vibrating wire sensor, a stainless steel transmission rod, and a mounting base. Their working principle involves using an anchor rod fixed to the monitoring location to transmit the deformation of deep soil or rock mass to the sensor via the transmission rod, thereby achieving long-term monitoring of multi-point displacement.

[0003] However, traditional rod-type multi-point displacement gauges have the following two prominent drawbacks in long-term use:

[0004] Sensor replacement is difficult and prone to "jamming": Sensors are secured inside the protective tube using bolts and washers on the mounting base. When a sensor needs replacement due to aging or damage, these fasteners may shift due to corrosion, deformation, or installation misalignment after long-term burial, causing significant friction or mechanical jamming between the sensor and the protective tube. This makes it difficult to pull the sensor out of the narrow tube, resulting in a "jamming" phenomenon. Ultimately, maintenance personnel have to abandon the replacement and re-drill a hole near the original location to install the new instrument, which not only significantly increases costs and time but also causes interruption of monitoring data.

[0005] Sensors are susceptible to damage from excessive displacement: Under certain geological conditions, the actual deformation at the monitoring point may exceed the sensor's design range. When the tensile displacement of the transmission rod is too large, it can directly stretch the displacement detection spring inside the sensor beyond its elastic limit, or even break it, causing permanent damage to the sensor. This damage is irreversible; even if the deformation recovers later, the sensor cannot be used again.

[0006] Therefore, there is an urgent need to design a new type of multi-point displacement meter whose structure should facilitate rapid sensor replacement and protect the sensor from damage under over-range displacement, so as to improve the maintenance efficiency and service life of the equipment. Utility Model Content

[0007] The present invention provides a snap-on multi-point displacement meter, which aims to solve the problems of difficult sensor replacement and easy damage due to over-range displacement in the prior art.

[0008] To solve the above problems, the technical solution adopted by this utility model is as follows:

[0009] This utility model provides a solution comprising:

[0010] A snap-on multi-point displacement gauge includes a mounting base and a plurality of displacement gauges for arrangement at different points; each displacement gauge includes an outer protective tube fixed to the mounting base and a displacement sensor installed inside the outer protective tube, the displacement sensor including a sensor housing, a displacement detection spring, and a threaded adapter connecting the spring, characterized in that it further includes:

[0011] A snap-fit ​​assembly for detachably positioning the sensor housing axially within the outer protective tube;

[0012] The sensor spring protection structure includes: an axially oriented strip-shaped limiting hole disposed on the sensor housing; and a limiting member fixed to the threaded adapter and movably fitted within the limiting hole.

[0013] Specifically, the latching assembly includes:

[0014] Anti-slip pads fixed to the sensor housing;

[0015] A buckle seat fixed to the outer wall of the outer protective tube and provided with stepped through holes;

[0016] A connecting rod that passes through the stepped through hole and has a locking tongue at one end is used to engage or disengage from the anti-slip pad.

[0017] A return spring is fitted onto the connecting rod and housed within the large-diameter section of the stepped through hole. One end of the return spring abuts against the locking tongue, and the other end abuts against the stepped portion of the stepped through hole.

[0018] Rotate the handle fitted to the other end of the connecting rod.

[0019] The handle has a first working surface and a second working surface; when the handle is rotated to a position perpendicular to the connecting rod, the first working surface is in contact with the buckle seat, and the locking tongue is pressed against the anti-slip pad to lock the sensor housing; when the handle is rotated to a position parallel to the connecting rod, the second working surface is in contact with the buckle seat, and the locking tongue disengages from the anti-slip pad to release the sensor housing.

[0020] The transition surface between the first working surface and the second working surface is an arc-shaped surface.

[0021] The side of the locking tongue used to press against the anti-slip pad is provided with anti-slip serrations.

[0022] Furthermore, the aforementioned snap-fit ​​multi-point displacement gauge also includes a protective cover mounted on the mounting base, through which the instrument cable of the displacement sensor passes, and the snap-fit ​​assembly, outer protective tube, and displacement sensor are all located inside the protective cover.

[0023] Furthermore, the outer protective tube has a sealing cap at its opening, and the sensor housing penetrates through the sealing cap and is integrally designed with the sealing cap.

[0024] Compared with the prior art, the beneficial effects of this utility model are:

[0025] (1) This utility model replaces the traditional bolt fastening structure with an innovative snap-fit ​​assembly. Maintenance personnel only need to turn the handle to quickly engage or disengage the locking tongue from the anti-slip pad, thereby easily locking or releasing the sensor. This design fundamentally solves the "jamming" problem caused by fastener corrosion or displacement. When the sensor malfunctions, it can be quickly pulled out and replaced without re-drilling, greatly reducing maintenance costs and time, and ensuring the continuity and reliability of monitoring data.

[0026] (2) This utility model incorporates a sensor spring protection structure. When external deformation is excessive, the limiting member fixed on the threaded adapter will move along the strip-shaped limiting hole on the sensor housing. When it moves to the end of the limiting hole, the tension will be borne by the stronger sensor housing and threaded adapter, thus preventing the displacement detection spring from being stretched further. This structure effectively avoids the risk of the spring breaking due to overload, protects the core components of the sensor, and significantly improves the survivability and stability of the equipment under harsh geological conditions. Even if an over-range displacement occurs, the sensor can still be reused after removal.

[0027] (3) The working surfaces of the buckle assembly are connected by an arc-shaped transition, which makes the rotation operation smooth and avoids jamming during operation, ensuring the stability and reliability of locking and unlocking actions.

[0028] (4) By setting a sealing cap at the opening of the outer protective pipe, external impurities such as mud and groundwater can be effectively prevented from entering the inside of the protective pipe, protecting precision components such as sensors and cables from corrosion and damage, and further improving the long-term working reliability of the entire equipment.

[0029] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, embodiments of this utility model are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1This is a schematic diagram illustrating the application of the snap-fit ​​multi-point displacement meter in one embodiment of the present invention, showing the two states of the snap-fit ​​assembly being locked and released;

[0032] Figure 2 yes Figure 1 The enlarged view at point A shows the locking posture of the latch component corresponding to one of the displacement sensors;

[0033] Figure 3 yes Figure 1 The enlarged view at point B shows the release posture of the latch component corresponding to one of the displacement sensors;

[0034] Figure 4 yes Figure 1 The enlarged view at point C shows the sensor's spring protection structure;

[0035] In the diagram: 1. Mounting base; 2. Outer protective tube; 3. Displacement sensor; 31. Sensor housing; 311. Limiting hole; 32. Displacement detection spring; 321. Limiting component; 4. Buckle assembly; 41. Handle; 42. Pin; 43. Connecting rod; 44. Return spring; 45. Buckle seat; 46. Locking tongue; 47. Anti-slip pad; 5. Sealing cover; 6. Threaded adapter; 7. Transmission rod; 8. Anchor bolt; 9. Protective cover; 10. Grouting pipe; 11. Instrument cable. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0037] Please refer to Figures 1 to 4 This utility model discloses a snap-on multi-point displacement meter for multi-point deformation monitoring of engineering structures such as slopes and tunnels.

[0038] like Figure 1 The diagram illustrates the overall application scenario of this snap-on multi-point displacement gauge. The system includes a mounting base 1 set on the monitored ground surface, and several sets of displacement gauges for placement at monitoring points at different depths. Each displacement gauge includes an outer protective tube 2, which penetrates and is fixed to the mounting base 1, extending into a borehole at a predetermined depth. At each monitoring depth, it is fixed to the monitored area (such as rock or soil) via anchor bolts 8 and connected to a displacement sensor 3 via a transmission rod 7.

[0039] Displacement sensor 3 is installed inside the outer protective tube 2, and its interior includes sensor housing 31 and displacement detection spring 32 (e.g., Figure 4(As shown) and the threaded adapter 6 connected to the spring. The other end of the threaded adapter 6 is connected to the transmission rod 7. When the monitored part is displaced, the anchor rod 8 drives the transmission rod 7 and the threaded adapter 6 to move, thereby stretching the displacement detection spring 32. The displacement sensor 3 converts the deformation into an electrical signal, which is transmitted to the external data acquisition device through the instrument cable 11.

[0040] To address the problems of difficult sensor replacement and easy damage in existing technologies, the core innovation of this utility model lies in the design of a snap-fit ​​assembly 4 and a sensor spring protection structure.

[0041] Please refer to Figure 2 and Figure 3 , Figure 2 This is the locked state of the latch component 4. Figure 3 In the released state. The latching assembly 4 is used to detachably position the sensor housing 31 axially (i.e., vertically) inside the outer protective tube 2.

[0042] The specific structure of the buckle assembly 4 is as follows:

[0043] Anti-slip pad 47: Fixed to the surface of sensor housing 31, for example, a groove can be provided to embed the anti-slip pad 47 therein, and its surface can be textured to increase friction.

[0044] Clip seat 45: Fixed to the outer wall of the outer protective tube 2. The clip seat 45 has a stepped through hole with a large diameter section and a small diameter section.

[0045] Connecting rod 43: Passes through the stepped through hole. One end is connected to the locking tongue 46, and the other end is rotatably connected to the handle 41 via a pin 42. The locking tongue 46 is cleverly designed so that it can be completely accommodated within the latch seat 45 in the released state. To enhance the locking effect, the side of the locking tongue 46 that presses against the anti-slip pad 47 can be provided with anti-slip serrations.

[0046] Return spring 44: Sleeve onto connecting rod 43 and housed within the large-diameter section of stepped through hole. One end abuts against the inner side of latch 46, and the other end abuts against the stepped portion formed by the transition from the large-diameter section to the small-diameter section of stepped through hole. Return spring 44 always provides a preload force to push latch 46 outward.

[0047] Handle 41: Used to lock and release the entire component.

[0048] The working process of the snap-fit ​​component 4 includes:

[0049] Locked state (e.g.) Figure 2When it is necessary to fix the displacement sensor 3, rotate the handle 41 to a position perpendicular to the connecting rod 43. At this time, the first working surface of the handle 41 is in contact with the outer surface of the buckle seat 45. Under the elastic force of the return spring 44, the locking tongue 46 is forcefully pressed against the anti-slip pad 47, and the sensor housing 31 is firmly axially locked by friction.

[0050] Release state (e.g.) Figure 3 When it is necessary to replace or adjust the displacement sensor 3, rotate the handle 41 90 degrees to a position parallel to the connecting rod 43. At this time, the second working surface of the handle 41 (or the cam portion on its rotation trajectory) presses against the latch seat 45, causing the connecting rod 43 to move outward, thereby compressing the return spring 44 and completely disengaging the locking tongue 46 from the anti-slip pad 47. At this time, the displacement sensor 3 can move freely up and down or be pulled out within the outer protective tube 2.

[0051] To ensure smooth operation, the transition surface between the first and second working surfaces of the handle 41 is designed as an arc-shaped surface to avoid jamming during rotation.

[0052] Please refer to Figure 4 The image is Figure 1 A magnified view of section C. The sensor spring protection structure is designed to prevent the displacement detection spring 32 from breaking due to excessive displacement. This structure includes an axially oriented strip-shaped limiting hole 311 on the sensor housing 31, and a limiting member 321 fixed to the outer wall of the threaded adapter 6. The limiting member 321 (preferably a spherical structure to reduce friction) is movably fitted within the limiting hole 311.

[0053] The working principle of the sensor spring protection structure is as follows: Within the normal operating range, the displacement of the threaded adapter 6 causes the limiting member 321 to slide freely within the length range of the limiting hole 311. When the monitoring point experiences tensile deformation exceeding its range, the limiting member 321 will move to the end of the limiting hole 311. At this time, the tensile force will be directly transmitted to the hole wall of the sensor housing 31 through the limiting member 321, and will no longer act on the displacement detection spring 32. In this way, the two rigid components, the sensor housing 31 and the threaded adapter 6, jointly bear the excessive tensile force, thereby effectively protecting the internal displacement detection spring 32 from being broken. The length of the limiting hole 311 can be designed according to the expected maximum deformation; for example, its length along the length direction of the outer protective tube 2 can be set to 5-10 cm.

[0054] In summary, this utility model, through its ingenious snap-fit ​​components and spring protection structure, successfully solves the technical pain points of existing technologies, such as the difficulty in replacing sensors, their tendency to "jam," and their susceptibility to damage due to overload. This significantly improves the ease of maintenance, reliability, and service life of multi-point displacement gauges.

[0055] In addition to the above, such as Figure 1 As shown, to protect the exposed precision components, a protective cover 9 is also provided on the mounting base 1. This protective cover 9 completely covers the snap-fit ​​assembly 4, the upper end of the outer protective tube 2, and the head of the displacement sensor 3. The instrument cable 11 of the displacement sensor 3 passes through the protective cover 9. This effectively prevents damage to the equipment from external factors such as rain, dust, and impacts.

[0056] like Figure 2 , Figure 3 As shown, to prevent debris such as mud and groundwater from entering the equipment through the gap between the outer protective pipe 2 and the sensor housing 31, a sealing cap 5 is also provided at the opening of the outer protective pipe 2. The sensor housing 31 passes through the sealing cap 5. In a preferred embodiment, the upper part of the sensor housing 31 and the sealing cap 5 are designed as a single unit, which provides a more reliable sealing effect and structural strength.

[0057] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A snap-fit ​​multi-point displacement gauge, comprising a mounting base (1) and a plurality of displacement gauges for arrangement at different points; the displacement gauges include an outer protective tube (2) that penetrates and is fixed to the mounting base (1), and a displacement sensor (3) installed inside the outer protective tube (2), the displacement sensor (3) including a sensor housing (31), a displacement detection spring (32), and a threaded adapter (6) connecting the spring, characterized in that, Also includes: A snap-fit ​​assembly (4) is used to detachably position the sensor housing (31) axially within the outer protective tube (2); The sensor spring protection structure includes: an axially oriented strip-shaped limiting hole (311) disposed on the sensor housing (31); And a limiting member (321) fixed to the threaded adapter (6) and movably fitted into the limiting hole (311).

2. The snap-on multi-point displacement gauge according to claim 1, characterized in that, The snap-fit ​​assembly (4) includes: Anti-slip pad (47) fixed to the sensor housing (31); A buckle seat (45) fixed to the outer wall of the outer protective tube (2) and provided with a stepped through hole; A connecting rod (43) that passes through the stepped through hole and is connected to a locking tongue (46) at one end, the locking tongue (46) being used to match and press against or disengage from the anti-slip pad (47); A return spring (44) is fitted onto the connecting rod (43) and housed within the large-diameter section of the stepped through hole. One end of the return spring (44) abuts against the locking tongue (46), and the other end abuts against the stepped portion of the stepped through hole. Rotate the handle (41) mounted on the other end of the connecting rod (43).

3. The snap-on multi-point displacement gauge according to claim 2, characterized in that, The handle (41) has a first working surface and a second working surface; when the handle (41) is rotated to a position perpendicular to the connecting rod (43), the first working surface is in contact with the buckle seat (45), and the locking tongue (46) is pressed against the anti-slip pad (47) to lock the sensor housing (31); when the handle (41) is rotated to a position parallel to the connecting rod (43), the second working surface is in contact with the buckle seat (45), and the locking tongue (46) disengages from the anti-slip pad (47) to release the sensor housing (31).

4. The snap-on multi-point displacement gauge according to claim 3, characterized in that, The transition surface between the first working surface and the second working surface is an arc-shaped surface.

5. The snap-fit ​​multi-point displacement gauge according to claim 2, characterized in that, The locking tongue (46) has anti-slip serrations on the side used to press against the anti-slip pad (47).

6. The snap-on multi-point displacement gauge according to claim 1, characterized in that, It also includes a protective cover (9) set on the mounting base (1), through which the instrument cable (11) of the displacement sensor (3) passes, and the snap-fit ​​assembly (4), the outer protective tube (2) and the displacement sensor (3) are all located inside the protective cover (9).

7. The snap-on multi-point displacement gauge according to claim 1, characterized in that, The outer protective tube (2) is provided with a sealing cap (5) at its opening. The sensor housing (31) passes through the sealing cap (5) and is designed as an integral part of the sealing cap (5).

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