Hydraulic engineering detection device

Abstract

The invention relates to a water conservancy project detection device, and belongs to the technical field of water conservancy project detection equipment, a hinge column of a flashboard in a detection pipeline is located in a mounting groove in the inner side wall of the upper portion of the detection pipeline, the cross section of the mounting groove is rectangular, and the two ends of the hinge column are rotatably mounted in the two opposite side walls of the mounting groove; opposite permanent magnets are arranged at one end of the hinge column, a conductive guide rod is fixed to the end of the hinge column in an insulated mode, the guide rod comprises two insertion rod sections parallel to the hinge column, and the two ends of each insertion rod section are fixed to the insulating circular truncated cone in a non-contact mode; a pair of guide rings are installed on the outer sides of the two inserting rod sections in a sliding fit mode, the inner side walls of the guide rings make sliding contact with the inserting rod sections, and the two guide rings are arranged in a spaced mode and connected to a monitoring circuit. According to the hydraulic engineering detection device, the flowing states of various fluids in the hydraulic engineering can be preliminarily monitored, and basic early warning information is provided for flood disasters and the like.

Description

Technical Field

[0001] The invention relates to the technical field of water conservancy engineering detection equipment, and in particular to a water conservancy engineering detection device. Background Art

[0002] In water conservancy projects, accurate monitoring of the flow of fluids such as water and sediment within the projects is crucial for water resources management, flood control scheduling, and water quality monitoring.

[0003] At present, fluid detection in water conservancy projects is mainly water flow detection, that is, using a flow meter to measure the water flow velocity. Common flow meters include radar flow meters and vortex flow meters. Radar flow meters use surface radar flow measurement to monitor surface flow velocity in canals / culverts / pipes, natural rivers and other places with fluctuating water flow. The cross-sectional flow rate is calculated by calibrating the relationship between the surface point velocity and the average flow velocity of the cross section.

[0004] The above traditional detection devices have high accuracy and are suitable for various water flow conditions, but they need to purchase professional equipment and configure corresponding professional operating technicians. Moreover, these existing devices are developed based on the flow of water, and are not suitable for comprehensive flow bodies containing silt or a large amount of silt, dead grass and other garbage. For example, if the existing flow meter is used for measurement, if the water flow is mixed with a large amount of sand, gravel, dead grass, etc., it will directly cause the impeller in the flow meter to be entangled and stop rotating. It is not versatile enough, and it cannot be used for non-pure water fluids such as silt. It cannot be used to monitor the flow of silt and other conditions in specific areas of water conservancy facilities, and then it is impossible to grasp the siltation of rivers, etc. In these occasions, it is not actually necessary to accurately measure the flow rate, but to make a qualitative assessment, such as determining whether the target fluid in the corresponding area is flowing, and the flow change trend, so as to provide a decision basis for timely disposal. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a water conservancy project detection device to solve the problem that the prior art cannot timely and reliably monitor the flow conditions of various fluids in water conservancy projects by simple and effective means.

[0006] The present invention is achieved through the following technical solutions:

[0007] A water conservancy project detection device comprises a gate plate hingedly installed in a detection pipe, a hinged column is fixed on the upper side of the gate plate, the hinged column is located in a mounting groove on the inner side wall of the upper part of the detection pipe, the mounting groove has a rectangular cross section, the two ends of the hinged column are rotatably installed in the two opposite side walls of the mounting groove, and in the assembled state, the gate plate is vertically suspended in the detection pipe and can isolate the space on both sides of the detection pipe; a mounting bin where at least one end of the hinged column is located is provided with permanent magnets facing each other, an insulating truncated cone is fixed on the end surface of the hinged column located in the mounting bin, a conductive guide rod is fixed on the free end of the insulating truncated cone, the guide rod comprises two plug-in rod sections parallel to the hinged column, the two ends of the plug-in rod section are respectively fixed on the insulating truncated cone without contacting each other, and a pair of guide rings are slidably mounted on the outer sides of the two plug-in rod sections, the guide ring is a conductive annular structure, the inner side wall of which is in sliding contact with the plug-in rod section, the two guide rings are arranged at intervals from each other, and are respectively connected to the two ends of a disconnection on a monitoring circuit.

[0008] Furthermore, the permanent magnets include a plurality of permanent magnets which surround the guide rod in a ring array.

[0009] Furthermore, the guide rod also includes an unclosed rectangular frame section, and the plug-in rod sections are integrally connected to both ends of the rectangular frame section, so that the guide rod has a convex structure.

[0010] Furthermore, the monitoring circuit also includes a resistor and an ammeter.

[0011] Furthermore, a supporting mechanism is provided between the two plug-in rod sections, and the length of the supporting mechanism can be adjusted to ensure that the two ends of the supporting mechanism can fully restrict the two plug-in rod sections to a position in contact with the inner wall of the guide ring.

[0012] Furthermore, the supporting mechanism includes a mounting seat fixedly mounted on the end surface of the insulating truncated cone, a stud is rotatably mounted in the mounting seat, the stud is perpendicular to the hinged column, a dial for rotating the stud is coaxially fixed to the center of the stud, and the dial is rotatably matched with the mounting seat; both ends of the stud are respectively threaded with a top column, the free end of the top column is used to support the plug-in rod section, a slider is fixed to the side wall of the top column, and the slider is slidably mounted in a guide groove on the inner wall of the mounting seat, the guide groove is arranged parallel to the stud, so that when the stud rotates, the two top columns move synchronously in opposite directions and contact their respective corresponding plug-in rod sections.

[0013] Furthermore, a strip groove is provided on the end surface of the free end of the top column, and the cross section of the strip groove is arc-shaped so that the plug-in rod section can be coaxially located in the strip groove.

[0014] Furthermore, a pressure spring is provided between the dial and the top column, and the pressure spring is always in a compressed state; gaskets are coaxially fixed to both ends of the pressure spring, and each pair of gaskets is embedded and fixed on the end surface of the top column and the end surface of the dial.

[0015] Furthermore, a tightening knob is sleeved on one of the top pillars, and a through hole is provided in the center of the tightening knob for the top pillar to pass freely. When the tightening knob is threadedly sleeved on the mounting seat, it abuts against an arcuate ridge coaxially fixed on the end face of the dial. On the dial end face on the inner side of the arcuate ridge, a plurality of scale lines are evenly spaced along the extension path of the arcuate ridge. When the dial is rotated, the scale lines can be aligned with a fixed indicating arrow on the surface of the mounting seat.

[0016] Furthermore, a limit pin is fixed on one side of the mounting seat, and the end of the limit pin is slidably fitted in an arc-shaped groove on the inner wall of the fastening knob, and a pre-tensioning spring is provided between one side of the mounting seat and the inner wall of the fastening knob. The pre-tensioning spring is always in a compressed state. When the fastening knob is rotated until the limit pin contacts one end of the arc-shaped groove, the dial is fixed, and when the fastening knob is rotated in the opposite direction until the limit pin contacts the other end of the arc-shaped groove, the dial can be easily rotated.

[0017] The beneficial effects of the present invention are:

[0018] The water conservancy project detection device is not only used for monitoring the water flow in water conservancy projects, but is a general fluid monitoring equipment. It does not use any precision metering elements and is an auxiliary simple facility with almost no requirements for the installation environment and medium. Based on the flow kinetic energy of the measured fluid, the hinged gate plate swings or rotates unevenly due to the impact of water flow, etc., causing the end of the fixed hinged column to swing or rotate at an inconstant angle in the installation bin, and then cut the magnetic flux lines at different speeds to generate different induced currents, and then through the monitoring circuit, the monitoring value of the corresponding fluid is intuitively reflected, and the actual situation of the fluid flow is preliminarily grasped.

[0019] For example, it is possible to quickly determine whether the silt accumulated at the corresponding depth of the water conservancy project has begun to flow, and then prepare for possible floods and mudslides in advance, clear the silt in time, and dredge the water conservancy facilities. In particular, the detection device is installed in the water flow and river siltation in the corresponding area. The water conservancy engineering technicians can combine the real-time monitoring data of the two and comprehensively judge whether floods and mudslides are likely to occur in the target area of ​​the water conservancy project to be tested.

[0020] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A cross-sectional diagram of the present invention;

[0022] Figure 2 It is a schematic diagram of the structure in the installation bin of the present invention;

[0023] Figure 3 for Figure 2 A magnified view of the structure within the middle rectangular dashed area;

[0024] Figure 4 for Figure 3 A schematic diagram of a top view structure of a dial in FIG.

[0025] Figure 5 for Figure 3 A bottom view of the fastening knob in FIG.

[0026] In the figure: detection pipeline 1, gate plate 2, hinged column 3, installation chamber 4, permanent magnet 5, guide rod 6, plug-in rod section 601, rectangular frame section 602, insulating frustum 7, monitoring circuit 8, mounting seat 9, stud 10, top column 11, dial 12, slider 13, pressure spring 14, gasket 15, tightening knob 16, limit pin 17, preload spring 18, arc convex ridge 19, indicator arrow 20, scale line 21, arc groove 22. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0030] See also Figure 1 The present invention provides a technical solution: a water conservancy project detection device, specifically comprising a gate plate 2 hingedly installed in a detection pipe 1. The detection pipe 1 is used to be installed in a water conservancy project or facility for supplying flowing media such as water flow, sediment, etc., and a hinged column 3 is fixed on the upper side of the gate plate 2. The hinged column 3 is located in a mounting groove on the inner side wall of the upper part of the detection pipe 1. The mounting groove can be opened along the length direction of the detection pipe 1. Specifically, the cross section of the mounting groove can be rectangular. The two ends of the hinged column 3 are rotatably installed in the two opposite side walls of the mounting groove to realize the hinged suspension installation of the gate plate 2. That is, when the detection device is in an assembled state, its gate plate 2 is vertically suspended in the detection pipe 1 and can isolate the space on both sides of the detection pipe 1. When the fluid at both ends of the detection pipe 1 flows through, it will push the gate plate 2 to swing or flip toward one side. Then, according to the flipping angle of the gate plate 2, the water flow velocity can be judged, and the water flow conditions of the facilities corresponding to the water conservancy project can be intuitively grasped. In particular, it can also be used as a gate when necessary. In order to preliminarily determine the flow speed and stability of water flow based on the flip of the gate 2, such as Figure 2-3 As shown, in this embodiment, in the installation bin 4 where at least one end of the hinged column 3 is located, permanent magnets 5 facing each other are provided. The permanent magnets 5 during specific manufacturing may include a plurality of permanent magnets 5, which are arranged in a ring array around the guide rod 6 mentioned later, so as to generate a more obvious induced current for detection. At the same time, the above-mentioned installation bin 4 can be fixed on one side of the detection pipeline 1, and the two can be integrally formed. In addition, an insulating truncated cone 7 is fixed on the end surface of the hinged column 3 located in the installation bin 4, and a conductive guide rod 6 is specially fixed on the free end of the insulating truncated cone 7. The guide rod 6 is not a straight rod-shaped structure, but must include two plug-in rod sections 601 parallel to the hinged column 3. For example, the guide rod 6 also includes an unclosed rectangular frame section 602, and the plug-in rod sections 601 are respectively integrally connected to the two ends of the rectangular frame section 602, so that the guide rod 6 is a convex structure. During installation, the two ends of the plug-in rod segment 601 can be fixed on the insulating truncated cone 7 without contacting each other, so that the guide rod 6 rotates with the rotation of the hinge column 3, that is, it swings or rotates an angle with the flipping of the gate plate 2, and a pair of guide rings are slidably mounted on the outer sides of the two plug-in rod segments 601. The pair of guide rings are conductive annular structures, which are mainly used to connect the guide rod 6 and conduct electricity. The inner side walls of the guide rings are in sliding contact with the plug-in rod segment 601, that is, when the guide rod 6 rotates, it always keeps in contact with the inner wall of the guide ring, and, as shown in FIG. Figure 3As shown, the two guide rings in this embodiment are arranged at intervals from each other. The purpose is that the two are respectively connected to the two ends of a disconnection on a monitoring circuit 8, which is equivalent to installing the guide rod 6 as one of the electronic components in the monitoring circuit 8. Since the guide rod 6 rotates relative to the permanent magnet 5, it cuts the magnetic flux lines and generates an induced electromotive force. Therefore, the guide rod 6 is actually connected to the monitoring circuit 8 as a power source, and then through the voltage or ammeter set on the monitoring circuit 8, for example, the monitoring circuit 8 also includes a resistor and an ammeter, so that the voltage generated by the guide rod 6 at this time can be obtained, and the flow trend of the fluid in the detection pipeline 1, including the flow velocity, that is, the speed of flow velocity change, etc., can be judged in turn.

[0031] In the above embodiments, one of the most critical structures is to stably transfer the induced current to the monitoring circuit 8. Figure 3 As shown, a supporting mechanism is also required between the two plug-in rod segments 601, and the length of the supporting mechanism can be adjusted to ensure that the two ends of the supporting mechanism can fully restrict the two plug-in rod segments 601 to a position in contact with the inner wall of the guide ring to maintain continuous and stable contact between the two conductive elements.

[0032] In this embodiment, Figure 3 In the structure shown, the supporting mechanism used specifically includes a mounting seat 9 fixedly mounted on the end surface of the insulating truncated table 7. The mounting seat 9 can be composed of a cylindrical tube and a rectangular block, which are integrally formed to form a roughly T-shaped structure. More specifically, a stud 10 is rotatably mounted in the mounting seat 9. The stud 10 is perpendicular to the hinge column 3, and a dial 12 for rotating the stud 10 is coaxially fixed in the center of the stud 10. That is, by turning the dial 12, the stud 10 can be rotated. Therefore, it is best that the dial 12 and the mounting seat 9 are also rotatably matched, and the rotation installation is more reliable. In addition, the two ends of the stud 10 in this embodiment are respectively threadedly sleeved with a top column 11. The free end of the top column 11 is used to support the plug-in rod section 601 to prevent the two plug-in rod sections 601 from getting close to each other and separating from the corresponding guide ring after long-term use, which affects the transmission of the induced current. In more detail, a slider 13 is fixed to the side wall of the top column 11, and the slider 13 is slidably mounted in a guide groove (number not shown in the figure) on the inner wall of the mounting seat 9. The guide groove is arranged parallel to the stud 10 to guide the axial movement of the top column 11. That is to say, during operation, when the stud 10 is driven to rotate, the two top columns 11 will move synchronously and oppositely in a straight line under the restriction of the slider 13, thereby fully contacting their respective corresponding plug-in rod sections 601, which is convenient for future use and adjustment.

[0033] In this embodiment, in order to ensure that the top column 11 maintains reliable contact with the plug-in rod segment 601, a strip groove (not shown in the figure) is opened on the end face of the free end of the top column 11. The cross-section of this strip groove is arc-shaped, so that the plug-in rod segment 601 can be coaxially located in the strip groove, thereby preventing the plug-in rod segment 601 from separating from the top column 11.

[0034] In order to overcome the loose adjustment caused by the thread gap of the threaded stud 10, in this embodiment, Figure 3 A pressure spring 14 may be provided between the dial 12 and the top column 11. The pressure spring 14 is always in a compressed state to eliminate the meshing clearance of the thread teeth. To facilitate rotation, gaskets 15 may be coaxially fixed at both ends of the pressure spring 14. Each pair of gaskets 15 is embedded and fixed on the end surface of the top column 11 and the end surface of the dial 12. This also facilitates gradual and slow adjustment to avoid accidental movement of the dial 12.

[0035] In this embodiment, after the top column 11 is adjusted to the right position, in order to ensure its stable position, Figure 3 As shown, a tightening knob 16 needs to be sleeved on one of the top pillars 11. This tightening knob 16 is somewhat similar to a common bottle cap structure. There is a through hole in the center of the tightening knob 16 for the top pillar 11 to pass freely. When installing, the tightening knob 16 is screwed onto the mounting seat 9 in a threaded manner until the end face of the tightening knob 16 contacts and contacts an arcuate ridge 19 coaxially fixed to the end face of the dial 12, thereby fixing the dial 12 to prevent the stud 10 from malfunctioning. It should be specially noted here that the arcuate ridge 19 is used because it is impossible to directly press the end of the tightening knob 16 against the end face of the dial 12 in terms of the installation of the dial 12. Therefore, the arcuate ridge 19 must be designed to cross-contact and lock. In order to intuitively grasp the adjustment degree of the stud 10, you can also refer to Figure 4 In the structure shown, a plurality of scale lines 21 are evenly spaced along the extension path of the arcuate ridge 19 on the end face of the dial 12 on the inner side of the arcuate ridge 19. When the dial 12 is rotated, these scale lines 21 can be aligned one by one with a fixed indicator arrow 20 on the surface of the mounting seat 9, so that the rotation angle of the stud 10 can be intuitively grasped to avoid severe squeezing of the guide rod 6 after excessive adjustment to cause damage.

[0036] In this embodiment, in order to more intuitively grasp whether the tightening knob 16 is in an easily twistable state or in a locked state, as shown in FIG. Figure 3-Figure 5A limit pin 17 can be fixed on one side of the mounting seat 9, and the end of the limit pin 17 is slidably fitted in an arc groove 22 on the inner wall of the fastening knob 16, and a pre-tightening spring 18 is provided between one side of the mounting seat 9 and the inner wall of the fastening knob 16. The pre-tightening spring 18 is always in a compressed state to maintain the tightness of the threaded fit between the fastening knob 16 and the mounting seat 9, thereby preventing the fastening knob 16 from being easily rotated and preventing the fastening knob 16 from being sent by mistake. When the locking knob 16 is in use, the position in which the dial 12 is fixed is indicated by the position of the stop pin 17. When the locking knob 16 is in use, the stop pin 17 is in contact with one end of the arc groove 22. This position indicates that the dial 12 is fixed and does not need to be rotated any further. When the locking knob 16 is rotated in the opposite direction and the stop pin 17 is in contact with the other end of the arc groove 22, the dial 12 can be easily rotated for adjustment. This avoids the situation in which the locking knob 16 is quickly screwed out due to not knowing when the dial 12 can be easily rotated. This causes the locking knob 16 to quickly move away from the dial 12. After the dial 12 is completely released, it becomes abnormally loose during adjustment and cannot be gradually rotated at a slower pace, resulting in inconvenience in adjustment. In particular, in large-scale water conservancy projects, the size of the detection device is often relatively large. It is almost impossible to rotate the dial 12 manually and an external device is required to drive it. For example, the dial 12 is made into a gear shape so as to mesh with an external speed change gear transmission. At this time, if the number of rotations of the external drive device is not well controlled, the detection device is easily damaged.

[0037] In the above description of the present invention, it should be noted that the terms "one side", "the other side", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0038] In addition, the term "same" does not mean that the parts must be absolutely the same, but slight differences are allowed. The term "vertical" only means that the positional relationship between the parts is more vertical than "parallel", and does not mean that the structure must be completely vertical, but can be slightly tilted.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A water conservancy project detection device, characterized in that: The invention comprises a gate plate (2) hingedly mounted in a detection pipe (1), a hinged column (3) being fixed on the upper side of the gate plate (2), the hinged column (3) being located in a mounting groove on the inner side wall of the upper part of the detection pipe (1), the cross section of the mounting groove being rectangular, the two ends of the hinged column (3) being rotatably mounted in two opposite side walls of the mounting groove, and in the assembled state, the gate plate (2) is vertically suspended in the detection pipe (1) and can isolate the space on both sides of the detection pipe (1); Permanent magnets (5) facing each other are arranged in the installation chamber (4) where at least one end of the hinged column (3) is located. An insulating truncated cone (7) is fixed on the end surface of the hinged column (3) located in the installation chamber (4). A conductive guide rod (6) is fixed on the free end of the insulating truncated cone (7). The guide rod (6) comprises two plug-in rod sections (601) parallel to the hinged column (3). The two ends of the plug-in rod section (601) are fixed on the insulating truncated cone (7) without contacting each other, and a pair of guide rings are installed on the outer sides of the two plug-in rod sections (601) in sliding cooperation therewith. The guide ring is a conductive annular structure, and its inner side wall is in sliding contact with the plug-in rod section (601). The two guide rings are arranged at intervals from each other and are respectively connected to the two ends of a disconnection point on a monitoring circuit (8).

2. The water conservancy project detection device according to claim 1, characterized in that: The permanent magnets (5) include a plurality of permanent magnets (5), and all the permanent magnets (5) are arranged in a ring array around the guide rod (6).

3. The water conservancy project detection device according to claim 1, characterized in that: The guide rod (6) further comprises an unclosed rectangular frame section (602), and the two plug-in rod sections (601) are respectively and integrally connected to the two ends of the rectangular frame section (602), so that the guide rod (6) presents a convex structure.

4. The water conservancy project detection device according to claim 1, characterized in that: The monitoring circuit (8) also includes a resistor and an ammeter.

5. The water conservancy project detection device according to claim 1, characterized in that: A supporting mechanism is also provided between the two plug-in rod sections (601), and the length of the supporting mechanism can be adjusted to ensure that the two ends of the supporting mechanism can fully restrict the two plug-in rod sections (601) to a position in contact with the inner wall of the guide ring.

6. The water conservancy project detection device according to claim 5, characterized in that: The supporting mechanism comprises a mounting seat (9) fixedly mounted on the end surface of the insulating truncated table (7), a stud (10) being rotatably mounted in the mounting seat (9), the stud (10) being perpendicular to the hinged column (3), a dial (12) being coaxially fixed at the center of the stud (10) for rotating the stud (10), the dial (12) being rotatably matched with the mounting seat (9); a top column (11) being threadedly sleeved at both ends of the stud (10), the free end of the top column (11) being used to support the plug-in rod section (601), a slider (13) being fixed to the side wall of the top column (11), the slider (13) being slidably mounted in a guide groove on the inner wall of the mounting seat (9), the guide groove being arranged parallel to the stud (10), so that when the stud (10) rotates, the two top columns (11) move synchronously in opposite directions and contact with their respective corresponding plug-in rod sections (601).

7. The water conservancy project detection device according to claim 6, characterized in that: A strip groove is provided on the end surface of the free end of the top column (11), and the cross section of the strip groove is arc-shaped so that the plug-in rod section (601) can be coaxially located in the strip groove.

8. The water conservancy project detection device according to claim 6, characterized in that: A pressure spring (14) is also provided between the dial (12) and the top column (11), and the pressure spring (14) is always in a compressed state; gaskets (15) are coaxially fixed at both ends of the pressure spring (14), and each pair of gaskets (15) is respectively embedded and fixed on the end surface of the top column (11) and the end surface of the dial (12).

9. The water conservancy engineering detection device according to claim 6, characterized in that: A tightening knob (16) is also sleeved on one of the top pillars (11), and a through hole is provided in the center of the tightening knob (16) for the top pillar (11) to freely pass through. When the tightening knob (16) is threadedly sleeved on the mounting seat (9), it contacts and engages with an arcuate ridge (19) coaxially fixed on the end face of the dial (12). On the end face of the dial (12) inside the arcuate ridge (19), a plurality of scale lines (21) are evenly spaced along the extension path of the arcuate ridge (19). When the dial (12) is rotated, the scale lines (21) can be aligned with a fixed indicating arrow (20) on the surface of the mounting seat (9).

10. The water conservancy project detection device according to claim 9, characterized in that: A limit pin (17) is fixed on one side of the mounting seat (9), and the end of the limit pin (17) is slidably fitted in an arc-shaped groove (22) on the inner wall of the tightening knob (16). A preload spring (18) is provided between one side of the mounting seat (9) and the inner wall of the tightening knob (16), and the preload spring (18) is always in a compressed state. When the tightening knob (16) is rotated until the limit pin (17) contacts one end of the arc-shaped groove (22), the dial (12) is fixed. When the tightening knob (16) is rotated in the opposite direction until the limit pin (17) contacts the other end of the arc-shaped groove (22), the dial (12) can be easily rotated.

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