An apparatus for tunnel clearance convergence measurement

Abstract

The present application relates to the technical field of tunnel engineering survey, in particular to a device for tunnel clearance convergence measurement, which comprises a digital display steel ruler convergence instrument, and further comprises a guide wheel assembly mechanism, a ruler tape positioning and locking mechanism and a rotation assisting distance measuring mechanism. The rotation assisting distance measuring mechanism is provided to use the number of turns of the transmission wheel body counted by the turn number counting magnetic sensor of the rotation counting sensor part to calculate the ruler tape pull-out length in combination with the circumference of the transmission wheel body, and to form bidirectional verification with the direct measurement data of the digital display steel ruler convergence instrument, so as to effectively avoid the error caused by single measurement mode. Meanwhile, the detection accuracy of the intelligent sensor is high, and the measurement accuracy and reliability are improved. The components are designed in a modular manner, the connection relationship is clear, and the assembly and disassembly are convenient, so that the equipment maintenance and overhaul are facilitated. The electric telescopic rod drives the transmission wheel body to contact or separate from the ruler tape, and the winding and locking of the ruler tape are facilitated.

Description

Technical Field

[0001] This invention relates to the field of tunnel engineering measurement technology, specifically to a device for measuring tunnel clearance convergence. Background Technology

[0002] Tunnel clearance convergence measurement is a core component of tunnel construction safety monitoring. Its purpose is to assess the stability of the surrounding rock by monitoring its convergence deformation during construction, thereby identifying potential safety hazards and guiding the optimization of construction plans. Currently, the most commonly used equipment for tunnel clearance convergence measurement is the steel tape convergence meter, which has advantages such as simple structure, portability, and low cost, and is widely used in the monitoring of small and medium-sized tunnel construction.

[0003] However, existing steel tape convergence instruments have many technical defects in practical applications, making it difficult to meet the requirements of high-precision and high-efficiency measurement. Specifically, these defects are as follows: First, the tape guiding performance is insufficient. When the steel tape convergence instrument pulls out the tape, the tape is prone to deviation and twisting, resulting in uneven tape pulling. At the same time, the deviation of the tape will produce measurement errors, affecting the accuracy of the convergence measurement. Second, there is a lack of effective means to assist in measuring the tape length. Existing steel tape convergence instruments mainly rely on the scale of the tape itself to read the length. This single measurement method is prone to errors due to factors such as tape stretching and wear. Without intelligent sensors or other devices to assist in verifying the measurement results, it is difficult to guarantee measurement accuracy. Third, the tape positioning and locking are not stable enough. The tape is prone to slippage during the measurement process, causing fluctuations in the measurement data. This requires repeated adjustments and locking by the staff, reducing measurement efficiency.

[0004] To address the problems of the existing technologies, there is an urgent need to design a tunnel clearance convergence measurement device that can achieve precise guide of the measuring tape, has intelligent sensor-assisted distance measurement function, and stable positioning and locking, so as to solve the technical pain points of low measurement accuracy, low efficiency and poor adaptability of the existing steel tape convergence instrument, and meet the actual needs of tunnel construction safety monitoring. Summary of the Invention

[0005] The purpose of this invention is to provide a device for tunnel clearance convergence measurement, so as to solve the problems of insufficient tape guidance and lack of auxiliary distance measurement means in the existing steel tape convergence instruments mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a device for tunnel clearance convergence measurement, comprising a digital display steel tape convergence meter, and further comprising: A guide wheel assembly mechanism is fixedly installed in the middle section of the digital display steel ruler convergence instrument, and is used to guide and limit the tape pulled out by the digital display steel ruler convergence instrument. A tape positioning and locking mechanism is installed at the front end of the digital display steel tape convergence instrument and is used to guide and lock the tape. A rotating auxiliary distance measuring mechanism includes a connecting frame, an electric telescopic rod, an auxiliary guide wheel, a rotating counting sensor, and a tape locking assembly. The connecting frame is connected to the front end of the digital steel tape convergence instrument. The electric telescopic rod is installed on the back of the connecting frame, the auxiliary guide wheel is installed on the front of the connecting frame, the rotating counting sensor is connected to the telescopic end of the electric telescopic rod, and the tape locking assembly is installed on one side of the rotating counting sensor.

[0007] As a preferred embodiment of the device for tunnel clearance convergence measurement described in this invention, the digital display steel tape convergence instrument includes a digital display end, an adjusting nut, a tape roll frame, a steel tape roll, a tape roll winding arm, a first end suspension hook, an extension rod, and a second end suspension hook. The digital display end is used to display measurement data. The adjusting nut is located at the rear end of the digital display end. The tape roll frame is connected to the rear end of the digital display end. The steel tape roll is rotatably connected to the mounting opening of the tape roll frame. A locking hole is provided on the tape of the steel tape roll. The tape roll winding arm is connected to one end of the rotating shaft of the steel tape roll. The first end suspension hook is fixedly connected to one end of the tape roll frame. The extension rod is fixedly connected to the front end of the digital display end. The second end suspension hook is connected to the free end of the steel tape roll.

[0008] In a preferred embodiment of the device for tunnel clearance convergence measurement described in this invention, the extension rod is provided with a positioning frame and a positioning block. The positioning frame is fixedly connected to the upper end surface of the extension rod and is used to position the connection of the connecting frame part. The positioning block is fixedly disposed on the back of the extension rod and is used to position the connection of the tape positioning and locking mechanism.

[0009] As a preferred embodiment of the device for tunnel clearance convergence measurement described in this invention, the guide wheel assembly mechanism includes a rotating ring, a wheel bracket, a wheel seat, a guide wheel, guide posts, a return spring, and a stop. The rotating ring is fitted onto the end of the digital display terminal. The wheel bracket has an L-shaped structure, with its upper end vertically fixedly connected to the lower end of the rotating ring. Two sets of guide wheels are provided, and both sets of guide wheels are rotatably connected and installed on the side of the wheel seat. Three sets of guide posts are provided, and all three sets of guide posts are fixedly installed on the upper end of the wheel seat. The three sets of guide posts are inserted into the lower end of the wheel bracket. The wheel seat is connected to the lower end of the wheel bracket through the three sets of guide posts. The return spring is fitted onto the middle set of guide posts, and the stop is located on the upper end of the middle set of guide posts. The upper end of the return spring is connected to the stop, and the lower end abuts against the wheel bracket.

[0010] As a preferred embodiment of the device for tunnel clearance convergence measurement described in this invention, the tape positioning and locking mechanism includes a mounting base, a guide groove block, and a sliding roller. The mounting base is connected to the back of the extension rod, the guide groove block is fixedly connected to the lower end of the mounting base, and the sliding roller is rotatably mounted at both ends of the guide groove block. The upper end of the mounting base is provided with a positioning slot, which is used to cooperate with the positioning block for installation and positioning; The lower end of the guide block has a fixed through hole that communicates with the guide groove. The steel ruler roll passes through the guide groove of the guide block and rolls in contact with the sliding roller to achieve the positioning and guidance of the ruler roll.

[0011] As a preferred embodiment of the device for tunnel clearance convergence measurement according to the present invention, the connecting frame includes a base block, a front-end ruler guide groove block, a connecting end block, a side frame plate, an inner groove position, and a sliding guide groove. The lower end of the base block is fixedly provided with the front-end ruler guide groove block. The connecting end block is fixedly welded to the upper end surface of the base block and cooperates with the positioning frame. The connecting end block is bolted to the front end of the extension rod. The side frame plate is fixedly connected to the back of the base block. The inner groove position is opened on the front of the base block. The auxiliary guide wheel is rotatably installed in the inner groove position. The sliding guide groove is vertically opened on the side frame plate.

[0012] In a preferred embodiment of the device for tunnel clearance convergence measurement described in this invention, the rotation counting sensor includes a wheel frame, a transmission wheel, a rotation counting magnetic sensor, and a connecting arm. The transmission wheel is rotatably mounted on the wheel frame. The connecting arm is fixedly disposed at one end of the wheel frame and passes through the sliding guide groove. The other end of the connecting arm is connected to the telescopic end of an electric telescopic rod. The rotation counting magnetic sensor is fixedly mounted on the wheel frame, and its detection end is correspondingly disposed with the transmission wheel. A magnet is embedded along the circumference on the side of the transmission wheel. The rotation counting magnetic sensor collects the number of rotations of the transmission wheel by detecting the number of times the magnet passes by.

[0013] As a preferred embodiment of the device for tunnel clearance convergence measurement described in this invention, the transmission wheel is in close contact with the tape passing through the front guide slot block under the drive of the electric telescopic rod. When the tape is pulled out, it drives the transmission wheel to rotate synchronously. The rotation count magnetic sensor collects the number of rotations of the transmission wheel and calculates the tape pull-out length based on the circumference of the transmission wheel, thereby realizing the auxiliary measurement of the tape length.

[0014] As a preferred embodiment of the device for tunnel clearance convergence measurement described in this invention, the tape locking assembly includes a reinforcing arm, a side baffle, and a locking pin. The reinforcing arm is connected to the bottom of the wheel frame, the side baffle is fixedly connected to the other end of the reinforcing arm, and the locking pin is connected to the side of the reinforcing arm. The upper end of the locking pin can be inserted into the fixing hole and the locking hole of the tape to achieve temporary locking of the tape.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. By setting up a guide wheel assembly mechanism, two sets of guide wheels are used to guide the tape in both directions. The design of the L-shaped wheel bracket and three sets of guide columns improves the structural stability of the guide wheel assembly mechanism. Combined with the elastic effect of the return spring, the guide wheel is always in close contact with the tape, which can effectively prevent the tape from deviating, twisting and jamming when it is pulled out, and ensure that the tape is pulled out smoothly along a straight line, reducing guidance error.

[0016] 2. By setting up a rotating auxiliary distance measuring mechanism, the rotation count magnetic sensor of the rotating counting sensor unit collects the number of rotations of the transmission wheel, and calculates the length of the tape pull-out by combining the circumference of the transmission wheel. This forms a two-way verification with the direct measurement data of the digital steel tape convergence instrument, effectively avoiding the errors caused by a single measurement method. At the same time, the high detection accuracy of the intelligent sensor improves the measurement accuracy and reliability. The modular design of each component makes the connection relationship clear, and the assembly and disassembly are convenient, which facilitates the maintenance and repair of the equipment. The electric telescopic rod drives the transmission wheel to contact or separate from the tape, which facilitates the winding and locking of the tape.

[0017] 3. The tape positioning and locking mechanism uses guide grooves and sliding rollers to perform secondary positioning and guidance of the tape. In conjunction with the locking pin of the tape locking component, it inserts into the locking hole and fixing hole of the tape to achieve temporary locking of the tape, avoiding data fluctuations caused by tape slippage during measurement and greatly improving measurement efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is an overall front view of the present invention; Figure 3 This is a schematic diagram of the overall first-view structure of the present invention; Figure 4 This is a schematic diagram of the overall second-view structure of the present invention; Figure 5 for Figure 4 Enlarged view of point A in the middle; Figure 6 This is a schematic diagram of the first-view structure connecting the tape positioning and locking mechanism, the rotating auxiliary distance measuring mechanism, and the extension rod of the present invention. Figure 7This is a schematic diagram of the second-view structure connecting the tape positioning and locking mechanism, the rotating auxiliary distance measuring mechanism, and the extension rod of the present invention. Figure 8 for Figure 6 Enlarged view at point B in the middle; Figure 9 This is a schematic diagram of the ruler positioning and locking mechanism and the rotating auxiliary distance measuring mechanism of the present invention; Figure 10 for Figure 9 Enlarged view of point C in the middle.

[0019] The attached diagram lists the components represented by each number as follows: 100. Digital display steel tape convergence device; 110. Digital display terminal; 120. Adjusting nut; 130. Tape roll holder; 140. Steel tape roll; 141. Locking hole; 150. Tape roll rewinding arm; 160. First end suspension hook; 170. Extension rod; 171. Positioning frame; 172. Positioning block; 180. Second end suspension hook; 200. Guide wheel assembly mechanism; 210. Rotary ring; 220. Wheel body bracket; 230. Wheel seat; 240. Guide wheel body; 250. Guide post; 260. Return spring; 270. Stop; 300. Belt positioning and locking mechanism; 310. Mounting base; 311. Positioning slot; 320. Guide block; 321. Fixing perforation; 330. Sliding roller; 400. Rotating auxiliary distance measuring mechanism; 410. Connecting frame part; 411. Base block; 412. Front ruler guide groove block; 413. Connecting end block; 414. Side frame plate; 415. Inner groove position; 416. Sliding guide groove; 420. Electric telescopic rod; 430. Auxiliary guide wheel; 440. Rotation counting sensor part; 441. Wheel frame; 442. Transmission wheel body; 443. Rotation counting magnetic sensor; 444. Connecting arm; 450. Ruler locking assembly; 451. Reinforcing arm; 452. Side baffle; 453. Locking pin. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] This invention provides a technical solution: such as Figures 1-10 The device shown is for tunnel clearance convergence measurement, including a digital display steel tape convergence meter 100, and further comprising: The guide wheel assembly mechanism 200 is fixedly installed in the middle section of the digital display steel ruler convergence device 100, and is used to guide and limit the tape pulled out by the digital display steel ruler convergence device 100. The tape positioning and locking mechanism 300 is installed at the front end of the digital display steel tape convergence instrument 100 and is used to guide and lock the tape. The rotating auxiliary distance measuring mechanism 400 includes a connecting frame 410, an electric telescopic rod 420, an auxiliary guide wheel 430, a rotating counting sensor 440, and a tape locking assembly 450. The connecting frame 410 is connected to the front end of the digital display steel tape convergence instrument 100. The electric telescopic rod 420 is installed on the back of the connecting frame 410, the auxiliary guide wheel 430 is installed on the front of the connecting frame 410, the rotating counting sensor 440 is connected to the telescopic end of the electric telescopic rod 420, and the tape locking assembly 450 is installed on one side of the rotating counting sensor 440.

[0022] In some embodiments of the present invention, reference is made to... Figures 3-4 As shown, the digital display steel ruler convergence device 100 includes a digital display terminal 110, an adjusting nut 120, a ruler roll frame 130, a steel ruler roll 140, a ruler roll winding arm 150, a first end suspension hook 160, an extension rod 170, and a second end suspension hook 180. The digital display terminal 110 is used to display measurement data. The adjusting nut 120 is located at the rear end of the digital display terminal 110. The ruler roll frame 130 is connected to the rear end of the digital display terminal 110. The steel ruler roll 140 is rotatably connected to the mounting port of the ruler roll frame 130. A locking hole 141 is provided on the ruler strip of the steel ruler roll 140. The ruler roll winding arm 150 is connected to one end of the rotating shaft of the steel ruler roll 140. The first end suspension hook 160 is fixedly connected to one end of the ruler roll frame 130. The extension rod 170 is fixedly connected to the front end of the digital display terminal 110. The second end suspension hook 180 is connected to the free end of the steel ruler roll 140.

[0023] Furthermore, the extension rod 170 is provided with a positioning frame 171 and a positioning block 172. The positioning frame 171 is fixedly connected to the upper end surface of the extension rod 170 and is used to position the connection of the connecting frame part 410. The positioning block 172 is fixedly provided on the back of the extension rod 170 and is used to position the connection of the tape positioning and locking mechanism 300.

[0024] In some embodiments of the present invention, reference is made to... Figures 4-5As shown, the guide wheel assembly mechanism 200 includes a rotating ring 210, a wheel bracket 220, a wheel seat 230, a guide wheel 240, a guide post 250, a return spring 260, and a stop 270. The rotating ring 210 is fitted onto the end of the digital display terminal 110. The wheel bracket 220 has an L-shaped structure, with its upper end vertically fixed to the lower end of the rotating ring 210. Two sets of guide wheels 240 are provided, and both sets of guide wheels 240 are rotatably connected to and mounted on the wheel seat 230. On the side, three sets of guide posts 250 are provided. All three sets of guide posts 250 are fixedly installed on the upper end of the wheel seat 230. The three sets of guide posts 250 are inserted into the lower end of the wheel body bracket 220. The wheel seat 230 is connected to the lower end of the wheel body bracket 220 through the three sets of guide posts 250. The return spring 260 is fitted on the middle set of guide posts 250. The stop head 270 is located on the upper end of the middle set of guide posts 250. The upper end of the return spring 260 is connected to the stop head 270, and the lower end abuts against the wheel body bracket 220.

[0025] By setting up a guide wheel assembly mechanism 200, two sets of guide wheel bodies 240 are used to guide the tape in both directions. The design of the L-shaped wheel body bracket 220 and three sets of guide columns 250 improves the structural stability of the guide wheel assembly mechanism 200. With the elastic action of the return spring 260, the guide wheel body 240 is always in close contact with the tape, which can effectively prevent the tape from deviating, twisting and jamming when it is pulled out, ensuring that the tape is pulled out smoothly in a straight line and reducing guidance error.

[0026] In some embodiments of the present invention, reference is made to... Figure 6 and Figure 10 As shown, the tape positioning and locking mechanism 300 includes a mounting base 310, a guide groove block 320 and a sliding roller 330. The mounting base 310 is connected to the back of the extension rod 170, the guide groove block 320 is fixedly connected to the lower end of the mounting base 310, and the sliding roller 330 is rotatably mounted on both ends of the guide groove block 320. The upper end of the mounting base 310 is provided with a positioning slot 311, which is used to cooperate with the positioning block 172 for installation and positioning. The lower end of the guide block 320 is provided with a fixed through hole 321 that communicates with the guide groove. The ruler strip of the steel ruler roll 140 passes through the guide groove of the guide block 320 and rolls in contact with the sliding roller 330 to achieve positioning and guidance of the ruler strip.

[0027] In some embodiments of the present invention, reference is made to... Figures 6-10As shown, the connecting frame part 410 includes a base block 411, a front end guide groove block 412, a connecting end block 413, a side frame plate 414, an inner groove position 415, and a sliding guide groove 416. The front end guide groove block 412 is fixedly provided at the lower end of the base block 411. The connecting end block 413 is fixedly welded to the upper end surface of the base block 411 and cooperates with the positioning frame 171. The connecting end block 413 is connected to the front end of the extension rod 170 by bolts. The side frame plate 414 is fixedly connected to the back of the base block 411. The inner groove position 415 is opened on the front of the base block 411. The auxiliary guide wheel 430 is rotatably installed in the inner groove position 415. The sliding guide groove 416 is vertically opened on the side frame plate 414.

[0028] The rotation counting sensor 440 includes a wheel frame 441, a transmission wheel 442, a rotation counting magnetic sensor 443, and a connecting arm 444. The transmission wheel 442 is rotatably mounted on the wheel frame 441. The connecting arm 444 is fixedly disposed at one end of the wheel frame 441 and passes through a sliding guide groove 416. The other end of the connecting arm 444 is connected to the telescopic end of the electric telescopic rod 420. The rotation counting magnetic sensor 443 is fixedly mounted on the wheel frame 441, and its detection end is correspondingly disposed with the transmission wheel 442. A magnet is embedded in the side of the transmission wheel 442 along its circumference. The rotation counting magnetic sensor 443 collects the number of rotations of the transmission wheel 442 by detecting the number of times the magnet passes by.

[0029] Driven by the electric telescopic rod 420, the transmission wheel 442 is in close contact with the tape passing through the front tape guide slot block 412. When the tape is pulled out, it drives the transmission wheel 442 to rotate synchronously. The outer surface of the transmission wheel 442 is covered with a rubber anti-slip layer to increase the friction with the tape and prevent slippage. The rotation count magnetic sensor 443 collects the number of rotations of the transmission wheel 442 and calculates the tape pull-out length based on the circumference of the transmission wheel 442, thereby realizing the auxiliary measurement of the tape length.

[0030] By setting up a rotating auxiliary distance measuring mechanism 400, the rotation counting magnetic sensor 443 of the rotating counting sensor unit 440 collects the number of rotations of the transmission wheel 442. Combined with the circumference of the transmission wheel 442, the length of the tape pulled out is calculated. This is used to form a two-way verification with the direct measurement data of the digital display steel tape convergence instrument 100, effectively avoiding errors caused by a single measurement method. At the same time, the intelligent sensor has high detection accuracy, improving measurement accuracy and reliability. The modular design of each component makes the connection relationship clear, and the assembly and disassembly are convenient, which facilitates the maintenance and repair of the equipment. The electric telescopic rod 420 drives the transmission wheel 442 to contact or separate from the tape, which facilitates the winding and locking of the tape.

[0031] The tape locking assembly 450 includes a reinforcing arm 451, a side baffle 452, and a locking pin 453. The reinforcing arm 451 is connected to the bottom of the wheel frame 441, the side baffle 452 is fixedly connected to the other end of the reinforcing arm 451, and the locking pin 453 is connected to the side of the reinforcing arm 451. The upper end of the locking pin 453 can be inserted into the fixing through hole 321 and the locking hole 141 of the tape to achieve temporary locking of the tape. The length of the locking pin 453 is less than the height of the side baffle 452, and the end of the locking pin 453 is designed as a 30° tapered guide head to facilitate insertion into the locking hole 141 of the tape.

[0032] The tape positioning and locking mechanism 300 uses the guide groove block 320 and the sliding roller 330 to perform secondary positioning and guidance of the tape. In conjunction with the locking pin 453 of the tape locking assembly 450, which is inserted into the locking hole 141 and the fixing through hole 321 of the tape, the tape is temporarily locked, avoiding data fluctuations caused by tape slippage during measurement and greatly improving measurement efficiency.

[0033] The operating steps of this device for tunnel clearance convergence measurement are as follows: Slowly pull out the steel tape roll 140. The tape first passes between the two sets of guide wheels 240 of the guide wheel assembly mechanism 200. Continue pulling out the tape so that it passes through the guide groove of the guide block 320 of the tape positioning and locking mechanism 300 and rolls into contact with the sliding roller 330. The sliding roller 330 further positions and guides the tape, reducing friction between the tape and the guide groove 320 and ensuring smooth tape pull-out. Continue pulling out the tape so that it passes through the front tape guide groove block 412 and the auxiliary guide wheel 430 of the rotating auxiliary distance measuring mechanism 400, and suspend and fix the second end hook 180 on the preset measurement point on one side of the tunnel.

[0034] Activate the electric telescopic rod 420, causing its telescopic end to retract. This retracts the rod, driving the wheel frame 441 to slide upwards along the sliding guide groove 416 of the side frame plate 414 via the connecting arm 444, until the transmission wheel 442 is in close contact with the tape. Then, close the electric telescopic rod 420. At this point, the transmission wheel 442 and the tape remain in close contact, ensuring that the tape can rotate synchronously when pulled. Because the reinforcing arm 451 of the tape locking assembly 450 is connected to the wheel frame 441, when the wheel frame 441 moves upwards, it causes the tape locking assembly 450 to move upwards synchronously. This causes the side baffle 452 connected to the reinforcing arm 451 to move upwards and block the guide groove of the guide block 320, preventing the tape from shifting out of the guide groove. When not moving upwards, the side baffle 452 does not block the guide groove. Because the length of the locking pin 453 is less than the height of the side baffle 452, the locking pin 453 cannot be inserted into the fixing hole 321 after the tape locking assembly 450 moves upward for the first time.

[0035] The device is then moved to the other side of the tunnel, and the first end hook 160 is suspended and fixed at a preset measurement point on the other side of the tunnel. The electric telescopic rod 420 is then activated, causing its telescopic end to retract further, which in turn moves the tape locking assembly 450 upwards, inserting it into the fixing hole 321 and then into the tape locking hole 141 to lock the tape. The tape length is then determined by reading the scale on the tape itself. Simultaneously, during the movement, the tape drives the transmission wheel 442 to rotate. The rotation count magnetic sensor 443 collects the number of rotations of the transmission wheel 442 and calculates the tape length based on the circumference of the transmission wheel 442, thus achieving auxiliary measurement of the tape length.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0037] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for tunnel clearance convergence measurement, comprising a digital display steel tape convergence meter (100), characterized in that, Also includes: The guide wheel assembly mechanism (200) is fixedly installed in the middle section of the digital display steel ruler convergence device (100) and is used to guide and limit the tape pulled out by the digital display steel ruler convergence device (100). A tape positioning and locking mechanism (300) is installed at the front end of the digital display steel tape convergence device (100) and is used to guide and lock the tape. A rotating auxiliary distance measuring mechanism (400) includes a connecting frame (410), an electric telescopic rod (420), an auxiliary guide wheel (430), a rotating counting sensor (440), and a tape locking assembly (450). The connecting frame (410) is connected to the front end of the digital steel tape convergence instrument (100). The electric telescopic rod (420) is installed on the back of the connecting frame (410). The auxiliary guide wheel (430) is installed on the front of the connecting frame (410). The rotating counting sensor (440) is connected to the telescopic end of the electric telescopic rod (420). The tape locking assembly (450) is installed on one side of the rotating counting sensor (440).

2. The device for tunnel clearance convergence measurement according to claim 1, characterized in that: The digital display steel tape convergence device (100) includes a digital display terminal (110), an adjusting nut (120), a tape roll holder (130), a steel tape roll (140), a tape roll winding arm (150), a first end suspension hook (160), an extension rod (170), and a second end suspension hook (180). The digital display terminal (110) is used to display measurement data. The adjusting nut (120) is located at the rear end of the digital display terminal (110). The tape roll holder (130) is connected to the rear end of the digital display terminal (110). The ruler roll (140) is rotatably connected to the mounting port of the ruler roll frame (130). The ruler strip of the steel ruler roll (140) is provided with a locking hole (141). The ruler strip winding arm (150) is connected to one end of the rotating shaft of the steel ruler roll (140). The first end hook (160) is fixedly connected to one end of the ruler roll frame (130). The extension rod (170) is fixedly connected to the front end of the digital display end (110). The second end hook (180) is connected to the free end of the steel ruler roll (140).

3. The device for tunnel clearance convergence measurement according to claim 2, characterized in that: The extension rod (170) is provided with a positioning frame (171) and a positioning block (172). The positioning frame (171) is fixedly connected to the upper end surface of the extension rod (170) and is used to position the connection of the connecting frame part (410). The positioning block (172) is fixedly disposed on the back side of the extension rod (170) and is used to position the connection of the tape positioning and locking mechanism (300).

4. The device for tunnel clearance convergence measurement according to claim 2, characterized in that: The guide wheel assembly mechanism (200) includes a rotating ring (210), a wheel bracket (220), a wheel seat (230), a guide wheel body (240), a guide post (250), a return spring (260), and a stop (270). The rotating ring (210) is fitted onto the end of the digital display terminal (110). The wheel bracket (220) has an L-shaped structure, with its upper end vertically fixed to the lower end of the rotating ring (210). Two sets of guide wheels (240) are provided, and both sets of guide wheels (240) are rotatably connected and installed on the side of the wheel seat (230). Three sets of guide posts (250) are provided. All three sets of guide posts (250) are fixedly installed on the upper end of the wheel seat (230). The three sets of guide posts (250) are inserted into the lower end of the wheel body bracket (220). The wheel seat (230) is connected to the lower end of the wheel body bracket (220) through the three sets of guide posts (250). The return spring (260) is fitted on the middle set of guide posts (250). The stop (270) is set on the upper end of the middle set of guide posts (250). The upper end of the return spring (260) is connected to the stop (270), and the lower end abuts against the wheel body bracket (220).

5. The device for tunnel clearance convergence measurement according to claim 3, characterized in that: The tape positioning and locking mechanism (300) includes a mounting base (310), a guide groove block (320), and a sliding roller (330). The mounting base (310) is connected to the back of the extension rod (170). The guide groove block (320) is fixedly connected to the lower end of the mounting base (310). The sliding roller (330) is rotatably mounted on both ends of the guide groove block (320). The upper end of the mounting base (310) is provided with a positioning slot (311), which is used to cooperate with the positioning block (172) for installation and positioning; The lower end of the guide block (320) is provided with a fixed through hole (321) that communicates with the guide groove. The tape of the steel ruler roll (140) passes through the guide groove of the guide block (320) and rolls in contact with the sliding roller (330) to achieve the positioning and guidance of the tape.

6. The device for tunnel clearance convergence measurement according to claim 5, characterized in that: The connecting frame part (410) includes a base block (411), a front end guide groove block (412), a connecting end block (413), a side frame plate (414), an inner groove position (415), and a sliding guide groove (416). The lower end of the base block (411) is fixedly provided with the front end guide groove block (412). The connecting end block (413) is fixedly welded to the upper end surface of the base block (411) and cooperates with the positioning frame (171). The connecting end block (413) is bolted to the front end of the extension rod (170). The side frame plate (414) is fixedly connected to the back of the base block (411). The inner groove position (415) is opened on the front of the base block (411). The auxiliary guide wheel (430) is rotatably installed in the inner groove position (415). The sliding guide groove (416) is vertically opened on the side frame plate (414).

7. The device for tunnel clearance convergence measurement according to claim 6, characterized in that: The rotation counting sensor (440) includes a wheel frame (441), a transmission wheel (442), a rotation counting magnetic sensor (443), and a connecting arm (444). The transmission wheel (442) is rotatably mounted on the wheel frame (441). The connecting arm (444) is fixedly set at one end of the wheel frame (441) and passes through the sliding guide groove (416). The other end of the connecting arm (444) is connected to the telescopic end of the electric telescopic rod (420). The rotation counting magnetic sensor (443) is fixedly mounted on the wheel frame (441), and its detection end is correspondingly set with the transmission wheel (442). A magnet is embedded in the side of the transmission wheel (442) along the circumference. The rotation counting magnetic sensor (443) collects the number of rotations of the transmission wheel (442) by detecting the number of times the magnet passes through.

8. The device for tunnel clearance convergence measurement according to claim 7, characterized in that: Driven by the electric telescopic rod (420), the transmission wheel (442) is in close contact with the tape passing through the front tape guide slot block (412). When the tape is pulled out, it drives the transmission wheel (442) to rotate synchronously. The rotation count magnetic sensor (443) collects the number of rotations of the transmission wheel (442) and calculates the tape pull-out length based on the circumference of the transmission wheel (442), thus realizing the auxiliary measurement of the tape length.

9. The device for tunnel clearance convergence measurement according to claim 7, characterized in that: The tape locking assembly (450) includes a reinforcing arm (451), a side baffle (452), and a locking pin (453). The reinforcing arm (451) is connected to the bottom of the wheel frame (441), the side baffle (452) is fixedly connected to the other end of the reinforcing arm (451), and the locking pin (453) is connected to the side of the reinforcing arm (451). The upper end of the locking pin (453) can be inserted into the fixing hole (321) and the locking hole (141) of the tape to achieve temporary locking of the tape.

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