An ultrasonic testing device for a skin

Abstract

The application discloses an ultrasonic detection device for a skin, which comprises a rack, a driving assembly and an anti-shielding support assembly arranged on the rack, an ultrasonic probe and a receiver arranged on the driving assembly, the receiver being used for detection in cooperation with the ultrasonic probe, the anti-shielding support assembly being arranged on the rack and used for supporting a material to be detected and avoiding hindering the propagation of ultrasonic waves, the anti-shielding support assembly comprising a frame, a plurality of support rods and a locking assembly, the frame being arranged on the rack, each of the support rods being arranged on the frame at intervals and being capable of moving along the frame, and the locking assembly being used for locking the positions of the support rods. The application has the advantages that the support rods do not hinder the propagation of ultrasonic waves in the detection process, and the detection accuracy is high.

Description

Technical Field

[0001] This invention relates to the field of ultrasonic testing technology, and in particular to an ultrasonic testing device for skin. Background Technology

[0002] "Skin" refers to the thin layer of material that covers the surface of a structure to provide protection or load-bearing function, and is commonly found in the fields of engineering and manufacturing.

[0003] The composite material skin of drones needs to be tested by ultrasound to determine whether the material meets the requirements. The testing requires an ultrasonic testing device for the skin. The existing ultrasonic testing device for skin supports the material with a bracket, and then the ultrasonic probe moves along the material and works with the receiver directly below the ultrasonic probe to detect flaws. However, because the support rod on the bracket is located between the receiver and the ultrasonic probe, it affects the transmission of ultrasonic waves and affects the test results. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide an ultrasonic testing device for skin that can achieve high detection accuracy without the obstruction of ultrasonic wave propagation by a support rod during the testing process.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: An ultrasonic testing device for skin includes a frame, on which a drive assembly and an anti-obstruction support assembly are mounted. The drive assembly has an ultrasonic probe and a receiver, the receiver being used to cooperate with the ultrasonic probe for testing. The anti-obstruction support assembly is mounted on the frame to support the material to be tested and to prevent obstruction of ultrasonic wave propagation. The anti-obstruction support assembly includes a frame, multiple support rods, and a locking assembly. The frame is mounted on the frame, the support rods are spaced apart on the frame and are movable along the frame, and the locking assembly is used to lock the position of the support rods.

[0006] As a further improvement to the above technical solution: The locking assembly includes a slider, an electromagnet, and inclined slots symmetrically arranged on both sides of the frame. The two ends of the support rod are respectively located in the inclined slots. The slider is slidably installed in the inclined slots and is sleeved on the end of the support rod. The electromagnet is set on the top wall of the inclined slots and is used to attract the slider.

[0007] The ultrasonic testing device for skin also includes a cleaning assembly for cleaning the side of the slider near the electromagnet and the side of the electromagnet near the slider.

[0008] The cleaning assembly includes a pipe and a blower. An opening communicating with a sloping groove is provided on the outer side of the frame. The blowing end of the blower is connected to the pipe, and the pipe is connected to each of the openings.

[0009] The air intake end of the hair dryer is equipped with a filter.

[0010] The slider is made of iron, and the width of the side of the slider closest to the electromagnet is the same as the width of the opening.

[0011] The slider includes a pair of blocks, one of which has a magnetic block on the side near the other. The blocks are made of iron, and the two blocks are connected by the attraction of the magnetic blocks to form the slider.

[0012] The slider is capable of sliding along the axial direction of the support rod, and the frame is provided with a limiting component for restricting the axial sliding of the slider. The limiting component includes a limiting groove and a limiting plate. The limiting groove is disposed on the inner wall of the frame and communicates with the inclined groove. The limiting plate is slidably installed in the limiting groove. When it is necessary to replace the worn slider, the limiting plate is pushed up along the limiting groove, and the limiting plate removes its obstruction of the slider. When it is not necessary to replace the worn slider, the limiting plate is lowered, and the limiting plate obstructs the slider.

[0013] The side of the limiting plate away from the limiting groove is flush with the inner side of the frame.

[0014] A laser rangefinder is provided on the inner side of the frame, and a hole corresponding to the laser rangefinder is provided on the support rod, the hole being used for the laser energy emitted by the laser rangefinder to pass through.

[0015] Compared with the prior art, the advantages of the present invention are as follows: 1. The ultrasonic testing device for skin of the present invention can retract the support rod directly below the moving path of the ultrasonic probe, so that the support rod does not obstruct the transmission and reception of ultrasonic waves, thereby avoiding affecting the test results.

[0016] 2. The ultrasonic testing device for skin of the present invention can clean the side of the slider near the electromagnet and the side of the electromagnet near the slider, avoiding the accumulation of dust and impurities, and preventing dust accumulation from affecting the smooth reset of the slider, thereby ensuring that the support rod can be reset normally, and avoiding the situation where the material is not placed horizontally due to the failure of the support rod to be reset normally, thus ensuring high reliability.

[0017] 3. The ultrasonic testing device for skin of the present invention uses a laser rangefinder to detect the position of the support rod before use, thereby determining which position of the support rod corresponds to a slider that is severely worn, which facilitates timely replacement by the staff and ensures the smooth progress of the testing. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the ultrasonic testing device for skin of the present invention.

[0019] Figure 2 This is a schematic diagram of the frame structure in the ultrasonic testing device for skin of the present invention.

[0020] Figure 3 This is a cross-sectional structural diagram of the frame in the ultrasonic testing device for skin of the present invention.

[0021] Figure 4 yes Figure 3 Enlarged view of point A in the middle.

[0022] Figure 5 This is a cross-sectional view of the blower in the ultrasonic testing device for skin of the present invention.

[0023] The labels in the diagram represent: 1. Frame; 2. Drive assembly; 3. Ultrasonic probe; 4. Receiver; 5. Frame; 6. Support rod; 7. Slider; 8. Electromagnet; 9. Rubber pad; 10. Opening; 11. Pipe; 12. Blower; 13. Filter; 14. Laser rangefinder; 15. Hole; 16. Magnetic block; 17. Limiting groove; 18. Limiting plate; 19. Inclined groove. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0027] In this invention, unless otherwise explicitly specified and limited, the terms "assembly," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0028] like Figures 1 to 5 As shown, the ultrasonic testing device for skin in this embodiment includes a frame 1. The frame 1 is equipped with a drive assembly 2 and an anti-obstruction support assembly. The drive assembly 2 is equipped with an ultrasonic probe 3 and a receiver 4. The receiver 4 is used to cooperate with the ultrasonic probe 3 for testing. The anti-obstruction support assembly is set on the frame 1 and is used to support the material to be tested and to avoid obstructing the propagation of ultrasonic waves. The anti-obstruction support assembly includes a frame 5, multiple support rods 6 and a locking assembly. The frame 5 is set on the frame 1, and each support rod 6 is spaced apart on the frame 5 and can move along the frame 5. The locking assembly is used to lock the position of the support rods 6.

[0029] In this embodiment, the ultrasonic testing device for skin is used by placing the material to be tested on the support rod 6. The drive assembly 2 drives the ultrasonic probe 3 and receiver 4 to move synchronously, so that the ultrasonic probe 3 and receiver 4 move from one end of the support rod 6 from left to right along the axis of the support rod 6 to test the material on the support rod 6 to detect whether the material is damaged. When the ultrasonic probe 3 and receiver 4 move to the rightmost side of the support rod 6, the drive assembly 2 then drives the ultrasonic probe 3 and receiver 4 to move forward, and then move from right to left to test the material. When the ultrasonic probe 3 and receiver 4 move to the leftmost side, the drive assembly 2 then drives the ultrasonic probe 3 and receiver 4 to move forward, and then move from left to right to test. This cycle is repeated until the entire material is fully tested. When the ultrasonic probe 3 and receiver 4 move to perform the detection, the support rod 6 will obstruct the propagation of ultrasonic waves and affect the detection results. Therefore, before the ultrasonic probe 3 and receiver 4 translate along the axis of the support rod 6, i.e., when the ultrasonic probe 3 is not above the support rod 6, the locking component releases the lock on the support rod 6 directly below the path of the ultrasonic probe 3's translation. This allows the support rod 6 to move along the frame 5 to below an adjacent support rod 6, ensuring that no support rod 6 obstructs the propagation of ultrasonic waves during subsequent movements of the ultrasonic probe 3 and receiver 4, thus improving detection accuracy. Just before the ultrasonic probe 3 and receiver 4 move along the next support rod 6, the descending support rod 6 is reset by the locking component, and the lock on the support rod 6 below the next translation path of the ultrasonic probe 3 is released. The reset support rod 6, together with the other support rods 6, can stably support the material. The unlocked support rod 6 will also move to below an adjacent support rod 6, ensuring it is not obstructed by ultrasonic waves between the ultrasonic probe 3 and receiver 4. This process continues on the same principle, ensuring that no support rod 6 obstructs the propagation of ultrasonic waves between the ultrasonic probe 3 and receiver 4 during the detection process, thus improving detection accuracy.

[0030] Furthermore, such as Figures 2 to 4 As shown, in this embodiment, the locking assembly includes a slider 7, an electromagnet 8, and inclined grooves 19 symmetrically arranged on both sides of the frame 5. The two ends of the support rod 6 are respectively located within the inclined grooves 19. The slider 7 is slidably installed within the inclined grooves 19 and is sleeved on the end of the support rod 6. The electromagnet 8 is disposed on the top wall of the inclined groove 19 and is used to attract the slider 7. When the electromagnet 8 is de-energized, it loses its magnetism, thus losing its attraction and fixation to the slider 7. Under the action of gravity, the support rod 6 and the slider 7 descend along the inclined groove 19, allowing the support rod 6 to move to the bottom of an adjacent support rod 6. When the electromagnet 8 is energized, it becomes magnetic, thereby attracting the slider 7 and lifting the support rod 6 upwards. Finally, the slider 7 contacts the electromagnet 8 and is attracted and fixed, completing the reset of the support rod 6. By controlling the on / off state of the electromagnet 8, the ultrasonic probe 3 and the receiver 4 are never obstructed by the support rod 6 during the detection process, eliminating the need for manual adjustment and achieving a high degree of automation.

[0031] Furthermore, in this embodiment, when the slider 7 slides to the bottom of the inclined groove 19 under the action of gravity, the support rod 6 moves to be located directly below the adjacent support rod 6. The stacking of the two support rods 6 does not affect the space of the adjacent translation detection section, and the structure is simple and compact.

[0032] Furthermore, in this embodiment, a rubber pad 9 is also provided on the bottom wall of the inclined groove 19. The rubber pad 9 can buffer the impact force generated by the slider 7 when it descends, reduce the vibration generated, avoid vibration disturbing the material, and allow the material to move slightly.

[0033] Furthermore, this embodiment also includes a cleaning component for cleaning the side of the slider 7 near the electromagnet 8 and the side of the electromagnet 8 near the slider 7. By cleaning the side of the slider 7 near the electromagnet 8 and the side of the electromagnet 8 near the slider 7 using the cleaning component, dust accumulation is prevented from affecting the smooth reset of the slider 7, thus ensuring that the support rod 6 can reset normally. This avoids situations where the material cannot be placed horizontally due to the support rod 6 failing to reset properly, ensuring high reliability.

[0034] Furthermore, such as Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, in this embodiment, the cleaning assembly includes a pipe 11 and a blower 12. An opening 10 communicating with a sloping groove 19 is provided on the outer side of the frame 5. The blowing end of the blower 12 is connected to the pipe 11, and the pipe 11 is connected to each opening 10. Outside air is injected into the pipe 11 by the blower 12, and then the air enters the sloping groove 19 through the opening 10, creating a continuous airflow. This cleans the side of the slider 7 near the electromagnet 8 and the side of the electromagnet 8 near the slider 7, preventing the accumulation of dust and impurities.

[0035] Furthermore, such as Figure 5 As shown, in this embodiment, a filter 13 is provided inside the suction end of the hair dryer 12. The filter 13 filters the air drawn in by the hair dryer, preventing external dust from being drawn in and blown into the inclined groove 19, thus improving the cleaning effect.

[0036] Furthermore, such as Figure 4 As shown, in this embodiment, the slider 7 is made of iron, and the width of the side of the slider 7 near the electromagnet 8 is the same as the width of the opening 10. This allows the airflow blowing out from the opening 10 to clean the side of the slider 7 near the electromagnet 8 and the side of the electromagnet 8 near the slider 7. The slider 7 can slide along the inclined groove 19 under the action of gravity, and move with the support rod 6 to a position directly below the adjacent support rod 6.

[0037] Furthermore, in this embodiment, the slider 7 includes a pair of locking blocks. One locking block has a magnetic block 16 on its side near the other locking block. The locking blocks are made of iron. The two locking blocks are connected by the attraction of the magnetic block 16 to form the slider 7. When the slider 7 needs to be replaced, the two locking blocks can be separated and the slider 7 can be removed for replacement without removing the entire support rod 6 from the device, making the replacement operation convenient.

[0038] Furthermore, in this embodiment, the slider 7 can slide along the axial direction of the support rod 6, and the frame 5 is provided with a limiting component for restricting the axial sliding of the slider 7. The limiting components include a limiting groove 17 and a limiting plate 18. The limiting groove 17 is disposed on the inner wall of the frame 5 and is connected to the inclined groove 19. The limiting plate 18 is slidably installed in the limiting groove 17. When it is necessary to replace the worn slider 7, the limiting plate 18 is pushed up along the limiting groove 17 and the limiting plate 18 removes its obstruction of the slider 7. When it is not necessary to replace the worn slider 7, the limiting plate 18 is lowered and the limiting plate 18 obstructs the slider 7. When it is necessary to replace the worn slider 7, push the limiting plate 18 up along the limiting groove 17. The limiting plate 18 will no longer block the slider 7. At this time, pull the slider 7 to move it along the support rod 6 to the outside of the inclined groove 19. Then pull a pair of locking blocks to separate them from each other. Then fix a new pair of locking blocks with the magnetic block 16 so that the slider 7 is fitted on the outside of the support rod 6. Then push the slider 7 into the inclined groove 19 and lower the limiting plate 18 so that the limiting plate 18 can block the slider 7. This completes the replacement of the slider 7, making the replacement operation more convenient.

[0039] Furthermore, in this embodiment, the side of the limiting plate 18 furthest from the limiting groove 17 is flush with the inner side of the frame 5. This ensures that the limiting plate 18 does not obstruct the propagation of ultrasonic waves and can limit the movement of one side of the slider 7.

[0040] Furthermore, such as Figure 2 As shown, in this embodiment, a laser rangefinder 14 is provided on the inner side of the frame 5, and a hole 15 corresponding to the laser rangefinder 14 is provided on the support rod 6. The hole 15 is used to allow the laser energy emitted by the laser rangefinder 14 to pass through. Due to long-term use, the slider 7 wears down, causing the height of the support rod 6 to drop after resetting. The different drop heights of multiple support rods 6 will affect the support of the material. Therefore, before use, the laser rangefinder 14 is turned on, and the laser energy emitted by the laser rangefinder 14 passes through multiple holes 15 to irradiate the inner wall of the frame 5. If the wear problem of the slider 7 occurs, the position of the support rod 6 will drop accordingly, causing the laser to be unable to pass through the hole 15, resulting in a change in the numerical display on the laser rangefinder 14. Based on the numerical display, it can be determined which position of the support rod 6 corresponds to the slider 7 that is severely worn, making it convenient for staff to understand and replace it in a timely manner.

[0041] Furthermore, in this embodiment, the strength of the support rod 6 itself ensures that it will not bend when supporting the material to be tested, so that the support rod 6 can stably support the material.

[0042] The control of the on / off timing of electromagnet 8 is achieved by programming the PLC controller based on the moving speed and moving path of drive component 2. The programming is existing technology and will not be elaborated here.

[0043] The ultrasonic probe 3 moves along the support rod 6 and is located directly above the support rod 6.

[0044] Working principle: During use, the material to be tested is placed on the support rod 6. The drive assembly 2 drives the ultrasonic probe 3 and receiver 4 to move synchronously, so that the ultrasonic probe 3 and receiver 4 move from one end of the support rod 6 from left to right along the axis of the support rod 6 to test the material on the support rod 6 to detect whether the material is damaged. When the ultrasonic probe 3 and receiver 4 move to the rightmost side of the support rod 6, the drive assembly 2 then drives the ultrasonic probe 3 and receiver 4 to move forward, and then move from right to left to test the material. When the ultrasonic probe 3 and receiver 4 move to the leftmost side, the drive assembly 2 then drives the ultrasonic probe 3 and receiver 4 to move forward, and then move from left to right to test. This cycle is repeated until the entire material is fully tested. When the ultrasonic probe 3 and receiver 4 move to perform the detection, the support rod 6 will obstruct the propagation of ultrasonic waves and affect the detection results. Therefore, before the ultrasonic probe 3 and receiver 4 translate along the axis of the support rod 6, i.e., before the ultrasonic probe 3 is above the support rod 6, the electromagnet 8 is de-energized, causing it to lose its magnetism. At this time, the electromagnet 8 loses its attraction and fixation to the slider 7. Under the action of gravity, the support rod 6 and slider 7 descend, allowing the support rod 6 to move directly below the adjacent support rod 6. This ensures that when the ultrasonic probe 3 and receiver 4 move subsequently, there will be no support rod 6 between the ultrasonic probe 3 and receiver 4 obstructing the propagation of ultrasonic waves, improving the accuracy of the detection. Just before the ultrasonic probe 3 and receiver 4 are about to move along the next support rod 6, the de-energized electromagnet 8 is energized. This causes the slider 7 to rise along with the support rod 6. Eventually, the slider 7 comes into contact with the electromagnet 8 and is attracted and fixed, completing the reset of the support rod 6. The lock on the support rod 6 directly below the next translation path of the ultrasonic probe 3 is released. The reset support rod 6, together with the other support rods 6, can stably support the material. The unlocked support rod 6 will also move to the bottom of the adjacent support rod 6, so that it will not be located between the ultrasonic probe 3 and the receiver 4 and obstruct the propagation of ultrasonic waves. The same principle applies to the following steps. This ensures that no support rod 6 will be located between the ultrasonic probe 3 and the receiver 4 and obstruct the propagation of ultrasonic waves during the detection process, thus improving the accuracy of the detection. The blower 12 draws outside air through the filter 13 and injects it into the pipe 11. The air then enters the inclined groove 19 through the opening 10, creating a continuous airflow. This cleans the side of the slider 7 near the electromagnet 8 and the side of the electromagnet 8 near the slider 7, preventing the accumulation of dust and impurities. This prevents dust accumulation from affecting the smooth reset of the slider 7, ensuring that the support rod 6 can reset normally and preventing the failure of the support rod 6 to reset normally, which could affect the horizontal placement of materials. Due to long-term use, the slider 7 wears down, causing the support rod 6 to drop in height after resetting. The varying drop heights of the multiple support rods 6 will affect the support of the material. Therefore, before use, the laser rangefinder 14 is turned on. The laser emitted by the laser rangefinder 14 can pass through multiple holes 15 and irradiate the inner wall of the frame 5. If the wear problem of the slider 7 mentioned above occurs, the position of the support rod 6 will drop accordingly, causing the laser to be unable to pass through the hole 15, resulting in a change in the numerical display on the laser rangefinder 14. Based on the numerical display, it can be determined which position of the support rod 6 corresponds to the slider 7 that is severely worn, making it convenient for staff to understand and replace it in a timely manner.

[0045] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention using the methods and techniques disclosed above, or modify them into equivalent embodiments with equivalent changes, without departing from the spirit and technical essence of the present invention. Therefore, any simple modifications, equivalent substitutions, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall still fall within the protection scope of the technical solutions of the present invention.

Claims

1. An ultrasonic testing device for skin, characterized in that: The device includes a frame (1), on which a drive assembly (2) and an anti-obstruction support assembly are provided. The drive assembly (2) is provided with an ultrasonic probe (3) and a receiver (4). The receiver (4) is used to cooperate with the ultrasonic probe (3) for detection. The anti-obstruction support assembly is set on the frame (1) and is used to support the material to be tested and to avoid obstructing the propagation of ultrasonic waves. The anti-obstruction support assembly includes a frame (5), multiple support rods (6) and a locking assembly. The frame (5) is set on the frame (1). Each of the support rods (6) is spaced apart on the frame (5) and can move along the frame (5). The locking assembly is used to lock the position of the support rods (6).

2. The ultrasonic testing device for skin according to claim 1, characterized in that: The locking assembly includes a slider (7), an electromagnet (8), and inclined grooves (19) symmetrically arranged on both sides of the frame (5). The two ends of the support rod (6) are respectively located in the inclined grooves (19). The slider (7) is slidably installed in the inclined grooves (19). The slider (7) is sleeved on the end of the support rod (6). The electromagnet (8) is set on the top wall of the inclined grooves (19) and is used to attract the slider (7).

3. The ultrasonic testing device for skin according to claim 2, characterized in that: The ultrasonic testing device for skin also includes a cleaning component for cleaning the side of the slider (7) near the electromagnet (8) and the side of the electromagnet (8) near the slider (7).

4. The ultrasonic testing device for skin according to claim 3, characterized in that: The cleaning assembly includes a pipe (11) and a blower (12). An opening (10) communicating with a sloping groove (19) is provided on the outside of the frame (5). The blowing end of the blower (12) is connected to the pipe (11), and the pipe (11) is connected to each of the openings (10).

5. The ultrasonic testing device for skin according to claim 4, characterized in that: The air intake end of the hair dryer (12) is equipped with a filter (13).

6. The ultrasonic testing device for skin according to claim 2, characterized in that: The slider (7) is made of iron, and the width of the side of the slider (7) near the electromagnet (8) is the same as the width of the opening (10).

7. The ultrasonic testing device for skin according to claim 2, characterized in that: The slider (7) includes a pair of blocks, one of which has a magnetic block (16) on the side near the other. The blocks are made of iron. The two blocks are connected by the attraction of the magnetic block (16) to form the slider (7).

8. The ultrasonic testing device for skin according to claim 2, characterized in that: The slider (7) is able to slide along the axial direction of the support rod (6), and the frame (5) is provided with a limiting component for limiting the axial sliding of the slider (7); The limiting component includes a limiting groove (17) and a limiting plate (18). The limiting groove (17) is disposed on the inner wall of the frame (5) and is connected to the inclined groove (19). The limiting plate (18) is slidably installed in the limiting groove (17). When it is necessary to replace the worn slider (7), the limiting plate (18) is pushed up along the limiting groove (17) and the limiting plate (18) removes the obstruction of the slider (7). When it is not necessary to replace the worn slider (7), the limiting plate (18) is lowered and the limiting plate (18) obstructs the slider (7).

9. The ultrasonic testing device for skin according to claim 8, characterized in that: The side of the limiting plate (18) away from the limiting groove (17) is flush with the inner side of the frame (5).

10. The ultrasonic testing device for skin according to any one of claims 1 to 9, characterized in that: The inner side of the frame (5) is provided with a laser rangefinder (14), and the support rod (6) is provided with a hole (15) corresponding to the laser rangefinder (14). The hole (15) is used to allow the laser emitted by the laser rangefinder (14) to pass through.

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