Intelligent carbon fiber anchor cable integrating supporting and monitoring functions

Abstract

The invention relates to an intelligent carbon fiber anchor cable with integrated supporting and monitoring functions, and belongs to the technical field of anchor cables. The monitoring section is connected with the anchoring section, and a supporting assembly and a monitoring assembly are arranged on the monitoring section; the free section is connected with the monitoring section and extends out of the slope; the monitoring assembly comprises a protective sleeve which sleeves and is slidably connected to the monitoring section; the supporting shell is coaxially arranged on the protective sleeve in a sleeving manner and fixedly connected to the protective sleeve; the transparent soft shell is coaxially sleeved outside the supporting shell, and a detection gap is reserved between the transparent soft shell and the supporting shell; the supporting assembly is used for supporting the transparent soft shell. The laser sensor is arranged in the detection gap so as to detect the interior of the slope; the optical fiber is electrically connected with the laser sensor so as to transmit a reflected signal of the laser sensor; and the controller is electrically connected with the optical fiber. The slope monitoring device has the beneficial effects that the interior of the slope can be conveniently monitored, so that the slope monitoring error is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of anchor cables, and in particular to an intelligent carbon fiber anchor cable with integrated support and monitoring functions. Background Art

[0002] Carbon fiber anchor cables are made of carbon fiber and have higher strength and lighter weight than traditional metal anchor cables. Carbon fiber anchor cables are commonly found in bridges, large buildings, offshore platforms and other structures that need to withstand large loads. Their advantages include strong corrosion resistance, easy installation and maintenance, and excellent performance under different environmental conditions.

[0003] Highway slopes are prone to cracking, instability, sliding or collapse under the influence of human intervention, rainfall or earthquakes. They are very harmful and difficult to manage. When the slope is large, they cause wounds that are difficult to restore the ecology. Traditional engineering support measures use prestressed anchor cables, such as carbon fiber anchor cables, to support and improve slope stability. However, it is still necessary to monitor the slope. Currently, slope monitoring is usually surface monitoring, such as through image acquisition or leveling. Although the surface phenomenon of the slope can reflect whether cracks and settlements occur inside the slope, when smaller cracks or settlements occur inside the slope, they cannot be fed back to the slope surface, resulting in errors in slope monitoring. Summary of the invention

[0004] In order to facilitate monitoring of the inside of the slope and reduce the error of slope monitoring, the present application provides an intelligent carbon fiber anchor cable with integrated support and monitoring functions, which adopts the following technical solutions: An intelligent carbon fiber anchor cable with integrated support and monitoring functions, comprising: Anchor section, anchored in the slope; A monitoring section connected to the anchoring section, wherein the monitoring section is provided with a support component and a monitoring component; A free section connected to the monitoring section and extending outside the slope; The monitoring components include: A protective sleeve, which is sleeved and slidably connected to the monitoring section; A supporting shell, coaxially sleeved and fixedly connected to the protective sleeve; A transparent soft shell is coaxially sleeved outside the supporting shell and a detection gap is left between the transparent soft shell and the supporting shell; the supporting assembly is used to support the transparent soft shell; A laser sensor is arranged in the detection gap to detect the inside of the slope; An optical fiber, electrically connected to the laser sensor to transmit a reflected signal of the laser sensor; A controller is electrically connected to the optical fiber.

[0005] By adopting the above technical solution, when the anchor cable is supporting normally, the laser sensor emits a laser signal, and the laser signal is irradiated to the internal soil layer of the slope through the transparent soft shell. Then the laser sensor receives the reflected signal, and the reflected signal is transmitted to the controller through the optical fiber. The controller analyzes the reflected signal to determine whether the interior of the slope is unstable, thereby facilitating the monitoring of the interior of the slope to reduce the error of slope monitoring.

[0006] Optionally, the anchor cable further comprises: The rotating assembly drives the laser sensor to move circumferentially around the supporting shell.

[0007] By adopting the above technical solution, the laser sensor monitoring becomes more comprehensive.

[0008] Optionally, the rotating assembly includes: A rotating gear ring is coaxially fixedly connected to the support shell; A rotating gear meshes with the rotating gear ring and rolls along the circumference of the supporting shell; A connecting rod, coaxially and fixedly connected to the rotating gear, and the laser sensor is mounted on the connecting rod; The rotating motor is used to drive the rotating gear ring to rotate.

[0009] By adopting the above technical solution, after the rotating motor is started, it will drive the rotating ring gear to rotate, and the rotating ring gear will drive the movement of the rotating gear, thereby driving the connecting rod to move circumferentially around the supporting shell.

[0010] Optionally, the rotating assembly further includes: An auxiliary main gear is coaxially fixedly connected to the output shaft of the rotating motor, and the rotating motor is installed outside the slope; an auxiliary slave gear meshing with the auxiliary master gear; Connecting the main gear, and being coaxially fixedly connected with the auxiliary slave gear; The connecting slave gear meshes with the connecting master gear and is coaxially fixedly connected to the rotating gear ring.

[0011] By adopting the above technical solution, since the rotating motor is not convenient to be directly installed on the anchor cable, it is necessary to install the rotating motor on the outside of the slope. Therefore, by setting an auxiliary main gear, an auxiliary slave gear, a connecting main gear and a connecting slave gear, the effect of the rotating motor driving the connecting rod to move is achieved.

[0012] Optionally, the anchor cable further comprises: A first pressure sensor is installed at both ends of the transparent soft shell and is used to detect the pressure on both ends of the transparent soft shell; The second pressure sensor slides synchronously with the laser sensor and is used to detect the pressure exerted on the laser sensor; the first pressure sensor and the second pressure sensor are electrically connected to the optical fiber.

[0013] By adopting the above technical solution, when deformation occurs inside the slope, a component force will be generated, causing the force on the transparent soft shell to change, thereby causing the pressure of the first pressure sensor and the second pressure sensor to change; therefore, it is possible to further determine whether deformation occurs inside the slope based on the pressure change and the reflected signal of the laser sensor, thereby further improving the monitoring effect.

[0014] Optionally, the anchor cable further comprises: an abutment plate, fixedly connected to the connecting rod; the second pressure sensor is mounted on the abutment plate; A sliding block abuts against the second pressure sensor; the laser sensor is mounted on the sliding block; A sliding column, fixedly connected to the sliding block and slidingly connected to the abutment plate; A return spring is coaxially sleeved on the sliding column.

[0015] Optionally, the support assembly includes: A support fixing plate is slidably connected to the support ring frame in the transparent soft shell; the first pressure sensor is in contact with the support fixing plate; A supporting sliding plate, slidably connected to the supporting fixed plate; The sliding component is used to drive the supporting sliding plate to slide.

[0016] By adopting the above technical solution, when the sliding component drives the supporting sliding plate to slide in a direction away from the supporting fixed plate where it is located, the detection path of the laser sensor is closed. At this time, the transparent soft shell is supported to facilitate the later grouting of the anchor hole; when the supporting sliding plate slides in a direction close to the supporting fixed plate where it is located, the detection path of the laser sensor is opened.

[0017] Optionally, the sliding component includes: A convex ring, fixedly connected to the supporting sliding plate and provided with an extrusion groove corresponding to the initial position of the laser sensor; The convex blocks are installed on both sides of the laser sensor, and the convex blocks are placed in the extrusion groove.

[0018] By adopting the above technical solution, when the laser sensor rotates, the convex block drives the convex ring to move, and the convex ring drives the supporting sliding plate to move.

[0019] Optionally, the anchor cable further comprises: The protective shell is sealingly and slidingly connected to the free section and the anchoring section respectively; the side wall of the protective shell abuts against the transparent soft shell, and a gap is left between the end of the protective shell and the transparent soft shell.

[0020] By adopting the above technical solution, the provision of the protective shell can block the slurry, thereby preventing the slurry from directly exerting pressure on the first pressure sensor during grouting, thereby making the measurement result more accurate.

[0021] Optionally, the anchor cable further comprises: A conductive ring is coaxially fixedly connected to the supporting fixed plate; one end of the optical fiber is electrically connected to the conductive ring close to the free section, and the other end is electrically connected to the controller; A conductive rod has one end connected with a signal transmission line, the signal transmission line is connected to the first pressure sensor, the second pressure sensor and the laser sensor, and the other end of the conductive rod slides on the conductive ring.

[0022] In summary, the present application has at least the following beneficial effects: 1. The purpose of setting up the laser sensor, support shell, transparent soft shell and controller is that when the anchor cable is supporting normally, the laser sensor emits a laser signal, the laser signal passes through the transparent soft shell to illuminate the internal soil layer of the slope, and then the laser signal is reflected and transmitted to the controller by the optical fiber. The controller analyzes the reflected signal to determine whether the inside of the slope is unstable, thereby facilitating the monitoring of the inside of the slope to reduce the error of slope monitoring.

[0023] 2. The purpose of setting the rotating assembly is to drive the laser sensor to move circumferentially around the supporting shell so that the laser sensor monitoring is more comprehensive.

[0024] 3. The purpose of setting the first pressure sensor and the second pressure sensor is to further determine whether deformation occurs inside the slope based on the pressure change and the laser signal of the laser sensor, thereby further improving the monitoring effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the anchor cable of the present application; Figure 2 It is a schematic diagram of the cross-sectional structure of the anchor cable of the present application; Figure 3 It is a structural block diagram of the control structure of this application; Figure 4 It is a schematic diagram of the cross-sectional structure of the anchor cable part; Figure 5 yes Figure 2 A magnified schematic diagram of the structure of part A; Figure 6It is a structural schematic diagram of the sliding component.

[0026] Description of reference numerals: 100, anchoring section; 200, monitoring section; 300, free section; 400, monitoring assembly; 410, protective cover; 420, supporting shell; 421, conductive ring; 422, conductive rod; 423, signal transmission line; 430, transparent soft shell; 440, laser sensor; 450, optical fiber; 460, controller; 470, first pressure sensor; 480, second pressure sensor; 490, pressing plate; 500, supporting assembly; 510, supporting fixing plate; 511, guide groove; 512, sliding spring; 520, supporting sliding plate; 530, sliding component; 531, convex ring; 532, convex block; 533, extrusion groove; 600, rotating assembly; 610, rotating ring gear; 620, rotating gear; 621, connecting slave gear; 622, auxiliary slave gear; 630, connecting rod; 631, abutment plate; 632, sliding block; 633, return spring; 634, sliding column; 640, rotating motor; 641, auxiliary main gear; 650, connecting main gear; 700, protective shell. DETAILED DESCRIPTION

[0027] To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the following will be combined with the appended drawings of the embodiments of the present invention. Figure 1 -Attached Figure 6 , the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] The present application embodiment discloses an intelligent carbon fiber anchor cable with integrated support and monitoring functions. Figure 1 As an embodiment of the anchor cable, the anchor cable may include an anchoring section 100 , a monitoring section 200 , a free section 300 , a supporting assembly 500 and a monitoring assembly 400 .

[0029] The anchoring section 100 is anchored in the slope, the monitoring section 200 is fixedly connected to the anchoring section 100, the support assembly 500 and the monitoring assembly 400 are both installed in the monitoring section 200, the support assembly 500 is used to support the monitoring assembly 400, and the monitoring assembly 400 is used to monitor the inside of the slope. The free section is fixedly connected to the monitoring section 200 and extends outside the slope.

[0030] Reference Figure 2 and Figure 3 The monitoring component 400 may include a protective cover 410 , a supporting shell 420 , a transparent soft shell 430 , a laser sensor 440 , an optical fiber 450 , and a controller 460 .

[0031] Among them, the protective cover 410 is sleeved and slid on the monitoring section 200, and the support shell 420 is coaxially sleeved and fixedly connected to the protective cover 410. The transparent soft shell 430 is sleeved on the monitoring section 200, and the support shell 420 is covered inside, and a detection gap is left between the support shell 420 and the support assembly 500. It is used to support the transparent soft shell 430. The transparent soft shell 430 can be a transparent corrugated tube, and the transparent soft shell 430 is supported by multiple support ring frames. The laser sensor 440 is installed on the support shell 420 and placed at the detection gap to detect the inside of the slope. The laser sensor 440 is connected to the external controller 460 through the optical fiber 450.

[0032] After the laser sensor 440 emits a laser signal, the laser passes through the transparent soft shell 430 and is reflected by the soil layer. The laser sensor 440 transmits the reflected signal to the controller 460 through the optical fiber 450. The controller 460 analyzes the reflected signal and can also transmit the reflected signal to the monitoring room, so that the monitoring personnel can determine whether the slope is deformed based on the reflected signal.

[0033] Reference Figure 1 and Figure 2 The anchor cable may further include a rotating assembly 600 to drive the laser sensor 440 to move circumferentially around the support shell 420. In addition, a plurality of laser sensors 440 may be arranged at intervals, and the plurality of laser sensors 440 move synchronously.

[0034] The rotating assembly 600 may include a rotating ring gear 610, a rotating gear 620, a connecting rod 630 and a rotating motor 640. The rotating ring gear 610 is coaxially fixedly connected to one end of the support shell 420 close to the free section 300; the rotating gear 620 is meshed with the rotating ring gear 610 and rolls along the circumference of the support shell 420. The connecting rod 630 is coaxially fixedly connected to the rotating gear 620, and the laser sensor 440 is installed on the connecting rod 630. The rotating motor 640 is installed on the outside of the slope to drive the rotation of the rotating ring gear 610.

[0035] In order to drive the rotation of the rotating gear ring 610, an auxiliary main gear 641 is coaxially fixedly connected to the output shaft of the rotating motor 640; a connecting slave gear 621 is coaxially fixedly connected to the rotating gear ring 610, and a connecting main gear 650 is rotatably connected to the transparent soft shell 430, and the connecting main gear 650 is meshed with the connecting slave gear 621. An auxiliary slave gear 622 is coaxially fixedly connected to the connecting slave gear 621, and the auxiliary slave gear 622 is meshed with the auxiliary main gear 641.

[0036] Reference Figure 4In order to realize the communication connection between the laser sensor 440 and the controller 460 through the optical fiber 450, conductive rings 421 are provided at both ends of the support shell 420, and one end of the optical fiber 450 is electrically connected to the conductive ring 421. The two conductive rings 421 are rotatably connected to conductive rods 422, and one end of the conductive rod 422 away from the conductive ring 421 is connected to the signal transmission line 423, and the signal transmission line 423 is electrically connected to the signal line in the connecting rod 630; the laser sensor 440 is electrically connected to the signal line in the connecting rod 630.

[0037] Reference Figure 2 and Figure 5 In order to further improve the monitoring effect, a first pressure sensor 470 is installed on the inner side of both ends of the transparent soft shell 430, and a second pressure sensor 480 is slidably connected to the support shell 420. The second pressure sensor 480 slides synchronously with the laser sensor 440, and the laser sensor 440 can abut against the second pressure sensor 480.

[0038] In order to achieve synchronous sliding of the second pressure sensor 480 and the laser sensor 440, an abutment plate 631 is fixedly connected to the connecting rod 630, and the abutment plate 631 can abut against the support shell 420; the second pressure sensor 480 is installed on the abutment plate 631. A sliding block 632 is slidingly connected to the abutment plate 631, and the second pressure sensor 480 abuts against the sliding block 632. A sliding column 634 is fixedly connected to the sliding block 632, and the sliding column 634 is slidingly connected to the abutment plate 631. A reset spring 633 is sleeved on the sliding column 634. The laser sensor 440 is installed on the sliding block 632; the laser sensor 440 is connected to the signal line in the connecting rod 630 through the signal line pre-buried in the abutment plate 631.

[0039] Reference Figure 2 , Figure 3 and Figure 4 The first pressure sensor 470 near the free section 300 is electrically connected to the conductive ring 421 at this end through the signal transmission line 423, and the first pressure sensor 470 near the anchoring section 100 is electrically connected to the conductive ring 421 at this end through the signal transmission line 423. The connecting rod 630 connects the two conductive rings 421, and the conductive rings 421 are pre-integrated with signal transmission circuits and power supply circuits, etc., which are conventional circuits and will not be elaborated here. The pressure data detected by the first pressure sensor 470 and the second pressure sensor 480 are transmitted to the controller 460 through the conductive ring 421, the connecting rod 630, and the optical fiber 450; the controller 460 further combines the pressure data and the reflection signal of the laser sensor 440 to determine whether deformation occurs inside the slope.

[0040] Reference Figure 4 and Figure 5, the support assembly 500 may include a support fixing plate 510, a support sliding plate 520 and a sliding component 530. Among them, the support fixing plate 510 is slidably connected to the support ring frame of the transparent soft shell 430. The first pressure sensor 470 is in contact with the support fixing plate 510; the conductive ring 421 is coaxially fixedly connected to the support fixing plate 510. The support sliding plate 520 is slidably connected to the support fixing plate 510 to open and close the detection path of the laser sensor 440. The sliding component 530 is used to drive the sliding of the support sliding plate 520. When the support sliding plate 520 slides in a direction away from the support fixing plate 510, the detection path is closed after two adjacent support sliding plates 520 are in contact.

[0041] In order to achieve sliding between the support fixing plate 510 and the support sliding plate 520, a guide groove 511 is provided on the support fixing plate 510, and the support sliding plate 520 is slidingly connected with the support fixing plate 510 through the guide groove 511. A sliding spring 512 is installed in the guide groove 511, and the sliding spring 512 is used to reset the support sliding plate 520 after sliding.

[0042] Reference Figure 6 , the sliding component 530 may include a convex ring 531 and a convex block 532; wherein the convex ring 531 is fixedly connected to the supporting sliding plate 520, and the convex blocks 532 are installed on both sides of the laser sensor 440; an extrusion groove 533 corresponding to the initial position of the laser sensor 440 is opened on the convex ring 531, and the convex block 532 is placed in the extrusion groove 533. When the laser sensor 440 is at the initial position, the supporting sliding plate 520 closes the detection path. When the laser sensor 440 rotates, the convex block 532 will push the movement of the convex ring 531, and the convex ring 531 drives the supporting sliding plate 520 to slide in the direction close to the supporting fixed plate 510, so as to open the detection path.

[0043] Reference Figure 2 A protective shell 700 is sealed and slidably connected to the free section 300 and the anchoring section 100 , the side wall of the protective shell 700 abuts against the transparent soft shell 430 , and a gap is left between the end of the protective shell 700 and the transparent soft shell 430 ; the optical fiber 450 passes through the protective shell 700 .

[0044] The implementation principle of this embodiment is: After the anchoring section 100 is installed in the slope, the anchor hole is tensioned and grouting is performed, at which time the supporting sliding plate 520 supports the transparent soft shell 430; after the grouting is completed, the rotating motor 640 and the controller 460 can be installed; during detection, the controller 460 controls the rotating motor 640 to start, the rotating motor 640 drives the connecting rod 630 to move, and the protrusion 532 drives the movement of the protruding ring 531, so that the supporting sliding plate 520 slides toward the supporting fixed plate 510 where it is located to open the detection path; the laser sensor 440 emits a laser, and the laser passes through the transparent soft shell 430 through the detection path to irradiate the soil layer, generating a reflection signal, and the laser sensor 440 transmits the reflection signal to the controller 460; at the same time, the first pressure sensor 470 and the second pressure sensor 480 transmit the detected pressure data to the controller 460, and the controller 460 analyzes the pressure data and the reflection signal to determine whether deformation occurs inside the slope.

[0045] The above are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application in sequence. Any feature disclosed in this specification (including the abstract and drawings), unless otherwise stated, can be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

Claims

1. An intelligent carbon fiber anchor cable with integrated support and monitoring functions, characterized in that: include: An anchoring section (100), anchored in the slope; A monitoring section (200) connected to the anchoring section (100), wherein the monitoring section (200) is provided with a support component (500) and a monitoring component (400); A free section (300) connected to the monitoring section (200) and extending outside the slope; The monitoring component (400) comprises: A protective sleeve (410) is sleeved on and slidably connected to the monitoring section (200); A supporting shell (420) is coaxially sleeved and fixedly connected to the protective sleeve (410); A transparent soft shell (430) is coaxially sleeved outside the supporting shell (420), and a detection gap is left between the transparent soft shell (430) and the supporting shell (420); the supporting assembly (500) is used to support the transparent soft shell (430); A laser sensor (440) is arranged in the detection gap to detect the interior of the slope; An optical fiber (450) electrically connected to the laser sensor (440) to transmit a reflection signal of the laser sensor (440); A controller (460) is electrically connected to the optical fiber (450).

2. The intelligent carbon fiber anchor cable with integrated support and monitoring functions according to claim 1, characterized in that: The anchor cable also includes: The rotating assembly (600) drives the laser sensor (440) to move circumferentially around the supporting shell (420).

3. The intelligent carbon fiber anchor cable with integrated support and monitoring functions according to claim 2 is characterized in that: The rotating assembly (600) comprises: A rotating ring gear (610) is coaxially fixedly connected to the support shell (420); A rotating gear (620) meshes with the rotating gear ring (610) and rolls along the circumference of the supporting shell (420); A connecting rod (630) is coaxially fixedly connected to the rotating gear (620), and the laser sensor (440) is mounted on the connecting rod (630); The rotating motor (640) is used to drive the rotating ring gear (610) to rotate.

4. The intelligent carbon fiber anchor cable with integrated support and monitoring functions according to claim 3 is characterized in that: The rotating assembly (600) further comprises: An auxiliary main gear (641) is coaxially fixedly connected to the output shaft of the rotating motor (640), and the rotating motor (640) is installed outside the slope; An auxiliary slave gear (622) meshing with the auxiliary master gear (641); A connected main gear (650) is coaxially fixedly connected to the auxiliary slave gear (622); The connecting slave gear (621) is meshed with the connecting master gear (650) and is coaxially fixedly connected to the rotating ring gear (610).

5. The intelligent carbon fiber anchor cable with integrated support and monitoring functions according to claim 3, characterized in that: The anchor cable also includes: A first pressure sensor (470) is installed at both ends of the transparent soft shell (430) and is used to detect the pressure exerted on both ends of the transparent soft shell (430); The second pressure sensor (480) slides synchronously with the laser sensor (440) and is used to detect the pressure exerted on the laser sensor (440); the first pressure sensor (470) and the second pressure sensor (480) are electrically connected to the optical fiber (450).

6. The intelligent carbon fiber anchor cable with integrated support and monitoring functions according to claim 5, characterized in that: The anchor cable also includes: an abutment plate (631) fixedly connected to the connecting rod (630); the second pressure sensor (480) is mounted on the abutment plate (631); A sliding block (632) is in contact with the second pressure sensor (480); the laser sensor (440) is mounted on the sliding block (632); A sliding column (634) is fixedly connected to the sliding block (632) and is slidingly connected to the abutment plate (631); The return spring (633) is coaxially sleeved on the sliding column (634).

7. The intelligent carbon fiber anchor cable with integrated support and monitoring functions according to claim 5, characterized in that: The support assembly (500) comprises: A support fixing plate (510) is slidably connected to a support ring frame in the transparent soft shell (430); the first pressure sensor (470) is in contact with the support fixing plate (510); A supporting sliding plate (520) slidably connected to the supporting fixed plate (510); The sliding component (530) is used to drive the supporting sliding plate (520) to slide.

8. The intelligent carbon fiber anchor cable with integrated support and monitoring functions according to claim 7, characterized in that: The sliding component (530) comprises: A convex ring (531) is fixedly connected to the supporting sliding plate (520) and is provided with an extrusion groove (533) corresponding to the initial position of the laser sensor (440); The convex blocks (532) are mounted on both sides of the laser sensor (440), and the convex blocks (532) are placed in the extrusion groove (533).

9. The intelligent carbon fiber anchor cable with integrated support and monitoring functions according to claim 7, characterized in that: The anchor cable also includes: The protective shell (700) is respectively connected to the free section (300) and the anchoring section (100) in a sealing and sliding manner; the side wall of the protective shell (700) is in contact with the transparent soft shell (430), and a gap is left between the end of the protective shell (700) and the transparent soft shell (430).

10. The intelligent carbon fiber anchor cable with integrated support and monitoring functions according to claim 7, characterized in that: The anchor cable also includes: A conductive ring (421) is coaxially fixedly connected to the supporting fixing plate (510); one end of the optical fiber (450) is electrically connected to the conductive ring (421) close to the free section (300), and the other end is electrically connected to the controller (460); A conductive rod (422) has one end connected to a signal transmission line (423), the signal transmission line (423) being connected to the first pressure sensor (470), the second pressure sensor (480) and the laser sensor (440), and the other end of the conductive rod (422) slidingly moves on the conductive ring (421).

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