Fixing device
By designing a fixing device for ultrasonic detectors, the problem of poor transducer position accuracy is solved, and the accuracy and accuracy of measurement results are improved.
Patent Information
- Application Number
- CN202421148899.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-24
- Publication Date
- 2025-04-18
- Estimated Expiration
- 2034-05-24
AI Technical Summary
In the prior art, when the ultrasonic detector calibrates the delay time of the system, the transducer position accuracy is poor, resulting in low accuracy of the measurement results.
A fixing device is designed, including a base body and two legs, with a scale mark on the base body, the legs can slidably match the base body, and the positioning mechanism is used to position the transducer to ensure its position is stable and accurate.
It improves the accuracy of the relative position of the transducer, enhances the accuracy and accuracy of the measurement results, simplifies the operation process, and reduces the detection cost.
Smart Images
Figure CN222774534U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of bridge detection, in particular to a fixing device. Background Art
[0002] The bridge structure is mainly composed of three parts: the bridge deck system, the superstructure and the substructure. The bridge structure bears the traffic load on the bridge deck. The bridge deck load is transmitted from the bridge deck system to the superstructure, then from the superstructure to the substructure, and finally from the substructure to the earth's pressure surface. Therefore, the pile foundation plays a vital role in the bridge structure. At present, the concrete cast-in-place pile is the main form of pile foundation in traffic engineering. Since its pile quality is affected by factors such as geological conditions, pile-making technology and mechanical equipment, it is easy to produce quality defects such as mud inclusion, concrete segregation and poor density of concrete on the pile top, which affects the stiffness of the pile body and endangers the normal use and safety of the main structure. In particular, the concrete cast-in-place pile is a concealed project. Therefore, it is very necessary to strengthen the quality control of the pile foundation and conduct integrity detection on the foundation pile. In the prior art, the acoustic wave transmission method is one of the main means of pile integrity detection methods. Because of its comprehensive detection range and fast and convenient detection process, it has been widely used in the integrity detection of concrete cast-in-place piles. Before the test begins, it is necessary to calibrate the system delay time t0 from the ultrasonic detector to the receiver. According to the requirements of JTG / T 3512-2020 "Technical Regulations for Highway Engineering Pile Testing", the test method is as follows: Place the transmitting transducer and the receiving transducer in parallel at the same height in clean water, with the center spacing starting from about 400mm and gradually increasing the distance between the two transducers with a spacing of 100mm, and measure the corresponding sound time at the same time; then use the vertical and horizontal axes to represent the spacing and sound time, and draw a graph. The intercept on the horizontal axis of the sound time is t0, and t0 can also be calculated by linear regression. To ensure the test accuracy, the measurement error of the distance between the two transducers is no more than 0.5%, and the measurement points are no less than 5 points.
[0003] The inventors have found that the prior art system for calibrating the system delay time from the transmission to the reception of an ultrasonic detector has at least the following disadvantages:
[0004] The relative positions of the two transducers are judged by the naked eye, but the position accuracy of the transducers is poor, and there is no structure to locate the position of the transducers during the movement, resulting in poor position stability of the transducers and poor accuracy of the measurement results. Utility Model Content
[0005] The purpose of the utility model is to provide a fixing device, which can improve the position stability of each transducer while ensuring the convenience of adjusting the positions of the two transducers, thereby improving the accuracy of the relative positions of the two transducers and further improving the accuracy of the measurement results.
[0006] The embodiment of the utility model is achieved as follows:
[0007] In a first aspect, the utility model provides a fixing device for positioning a delay time calibration transducer assembly of an ultrasonic detector system, wherein the transducer assembly comprises a paired transmitting transducer and a receiving transducer, including:
[0008] A base and two legs, the base is provided with scale lines arranged in the extension direction of a preset axis; the two legs are both mounted on the base, each of the legs is slidably matched with the base in the extension direction of the preset axis; each of the legs is provided with a positioning mechanism, and the positioning mechanisms on the two legs are respectively used to position the transmitting transducer and the receiving transducer.
[0009] In an optional embodiment, two groups of scale lines are provided, and the two groups of scale lines are arranged in the extension direction of the preset axis. The two supporting feet are respectively matched with the two groups of scale lines one by one, and each group of scale lines is used to indicate the position of the corresponding supporting foot relative to the base.
[0010] Based on the above scheme, the position of each leg is adjusted through a corresponding scale line. When the operator adjusts the leg, the corresponding scale line is used as a reference. The adjustment distance is directly obtained by reading the scale of the scale line, and no subtraction or addition or other conversion is required. The adjustment time is short, the adjustment efficiency is high, and the accuracy is high.
[0011] In an optional embodiment, the base includes a bottom plate and a transparent cover plate, the scale lines are arranged on a surface of the bottom plate, the transparent cover plate is fixed to the bottom plate and covers the scale lines; the support feet are slidably matched with the bottom plate and the transparent cover plate at the same time.
[0012] Based on the above scheme, the base is set as a split structure, and the scale lines are shielded by a transparent cover plate. The scale lines are set as a hidden structure. When the support feet slide relative to the base, the support feet will not wear the scale lines. The scale lines have a long service life and are not easy to be damaged, which reduces the cost of use. In addition, since the scale lines are not easy to be worn and damaged, it is easy to indicate the position of the support feet, which is conducive to directly reading data and improving the accuracy of position adjustment.
[0013] In an optional embodiment, a sliding hole is provided on the support leg, the sliding hole is sleeved outside the base, and the sliding hole and the base are slidably matched in the extension direction of the preset axis.
[0014] Based on the above solution, the supporting legs are sleeved on the outside of the base by utilizing the sliding holes, which is convenient for installation.
[0015] In an optional embodiment, the cross-sectional profile of the sliding hole is non-circular, and the cross-sectional profile of the base body corresponds to that of the sliding hole, so that the support leg and the base body are relatively fixed in the circumferential direction of the preset axis.
[0016] Based on the above scheme, the support foot and the base can slide in the extension direction of the preset axis, and the support foot will not rotate relative to the base. In this way, when the relative position of the transmitting transducer and the receiving transducer is adjusted by using the support foot, the transmitting transducer and the receiving transducer will not rotate relative to each other, the relative position of the two is accurate, and the transmitting and receiving functions of the two will not be affected. There is no need to adjust the circumferential position of the transmitting transducer and the receiving transducer multiple times, which shortens the adjustment time and improves the working efficiency.
[0017] In an optional embodiment, an observation hole connected to the sliding hole is provided on the support leg, and when the support leg slides relative to the base, part of the scale line can be exposed in the observation hole; an identification line is provided on the support leg, one end of the identification line extends to the edge of the hole wall of the observation hole, and the identification line is used to align with the scale line.
[0018] Based on the above solution, the identification line is exposed in the observation hole, which is conducive to obtaining the position of the support foot relative to the base through the cooperation of the identification line and the scale line.
[0019] In an optional embodiment, a locking screw is provided on the support foot, and the sliding hole is provided with a notch with adjustable spacing. The locking screw passes through the notch, and the locking screw is used to rotate relative to the support foot to increase or decrease the spacing of the notch, thereby adjusting the tightness of the sliding hole and the base.
[0020] Based on the above scheme, when it is necessary to adjust the position of the support foot relative to the base, loosen the locking screw, the friction between the support foot and the base is small, and the sliding adjustment position of the support foot is more flexible and convenient. When the position adjustment of the support foot relative to the base is completed, the relative position of the transmitting transducer and the receiving transducer is determined, and then the locking screw is used to lock the support foot to the base to ensure the stability of the positions of the transmitting transducer and the receiving transducer during the detection process, thereby improving the accuracy of the detection results.
[0021] In an optional embodiment, the positioning mechanism includes two claws arranged in pairs, the two claws are fixedly connected to the supporting foot, and the two claws cooperate to form a clamping space.
[0022] Based on the above solution, the positioning mechanism has a simple structure and is easy to disassemble and assemble the transmitting transducer or the receiving transducer.
[0023] In an optional embodiment, there are multiple positioning mechanisms on each of the legs, and the multiple positioning mechanisms are arranged at intervals in a direction perpendicular to the preset axis, and the multiple positioning mechanisms are used together to position the transmitting transducer or the receiving transducer.
[0024] Based on the above scheme, by locking the transmitting transducer or the receiving transducer through multiple positioning mechanisms, the combination firmness of the transmitting transducer and the receiving transducer with the support leg can be improved, thereby reducing assembly errors and improving the accuracy of detection results.
[0025] In an optional embodiment, a level is installed on the base; the support leg includes a vertically arranged pole and a base, the pole is slidably matched with the base, and the bottom of the base is provided with a plurality of adjustment studs for adjusting the horizontality.
[0026] Based on the above scheme, by setting a level, it is possible to obtain whether the base is horizontal, so as to know whether the two poles are vertically extended, thereby ensuring the horizontality of the transmitting transducer and the receiving transducer and improving the measurement accuracy. Before the test, by screwing the adjustment stud and cooperating with the level, the horizontality of the base can be improved, thereby improving the verticality of the pole.
[0027] The beneficial effects of the embodiments of the utility model are:
[0028] In summary, the fixing device provided in this embodiment installs the transmitting transducer and the receiving transducer on two supporting legs respectively, and the relative positions of the transmitting transducer and the receiving transducer and the supporting legs are stable. The relative position between the transmitting transducer and the receiving transducer can be adjusted by sliding the two supporting legs, and the supporting legs slide along the extension direction of the preset axis, relying on the guidance of the base body. When adjusting the relative distance between the two, the transmitting transducer and the receiving transducer will not rotate relative to each other, that is, the two can always be in the same vertical plane, ensuring the accuracy of the relative position of the transmitting transducer and the receiving transducer, and the sound waves emitted by the transmitting transducer can be accurately received by the receiving transducer, thereby improving the accuracy and precision of the measurement results. At the same time, when using the supporting legs to adjust the distance between the transmitting transducer and the receiving transducer, the operator can intuitively obtain the position of the supporting legs relative to the base body through the scale lines, so as to know the sliding distance of the supporting legs, reduce the difficulty of operation, improve the adjustment efficiency, and reduce the detection cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.
[0030] Figure 1 A schematic diagram of a fixing device according to an embodiment of the utility model;
[0031] Figure 2 A schematic diagram of a base body of an embodiment of the utility model;
[0032] Figure 3 A schematic diagram of a support leg according to an embodiment of the present utility model;
[0033] Figure 4 It is a schematic diagram of the support foot and the positioning mechanism according to an embodiment of the utility model.
[0034] icon:
[0035] 100-base; 101-scale line; 110-bottom plate; 120-transparent cover; 200-support foot; 201-sliding hole; 202-observation hole; 210-marking line; 220-locking screw; 230-vertical pole; 240-base; 300-positioning mechanism; 310-claw; 320-clamping space; 400-level meter. DETAILED DESCRIPTION
[0036] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.
[0037] 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 present invention to be protected, 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.
[0038] 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.
[0039] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model 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 a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.
[0040] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0041] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0042] In the prior art, in order to obtain the system delay time t0 from the transmission to the reception of the ultrasonic detector, the transmitting transducer and the receiving transducer are placed in parallel at the same height in the clear water, and the center spacing is gradually increased from about 400mm to 100mm, and the corresponding sound time is measured at the same time; the vertical and horizontal axes represent the spacing and sound time, and the intercept on the horizontal axis of the sound time is t0, which can also be calculated by linear regression. The whole process is manually operated, and the relative position of the two transducers is inconvenient to adjust, and the relative position accuracy is poor, resulting in poor accuracy of the measurement results.
[0043] Please combine Figure 1-Figure 4 In view of this, the designer provides a fixing device for positioning the delay time calibration transducer assembly of the ultrasonic detector system, which can improve the position stability of each transducer while ensuring the convenience of adjusting the position of the two transducers, thereby improving the accuracy of the relative position of the two transducers and further improving the accuracy of the measurement results.
[0044] The transducer assembly includes a paired transmitting transducer and a receiving transducer, and the sound waves emitted by the transmitting transducer can be received by the receiving transducer. The transducer assembly is a well-known structure, and in this embodiment, in order to avoid repeated description, the detailed structure and working principle of the transducer assembly are not described in detail.
[0045] In this embodiment, the fixing device includes a base 100 and two legs 200, and the base 100 is provided with scale lines 101 arranged in the extension direction of the preset axis; the two legs 200 are both installed on the base 100, and each leg 200 is slidably matched with the base 100 in the extension direction of the preset axis; each leg 200 is provided with a positioning mechanism 300, and the positioning mechanisms 300 on the two legs 200 are respectively used to position the transmitting transducer and the receiving transducer.
[0046] Based on the above solution, the working principle of the fixing device provided in this embodiment is as follows:
[0047] The transmitting transducer and the receiving transducer are respectively mounted on two legs 200, and the relative positions of the transmitting transducer and the receiving transducer and the legs 200 are stable. The relative position between the transmitting transducer and the receiving transducer can be adjusted by sliding the two legs 200, and the legs 200 slide along the extension direction of the preset axis, guided by the base 100. When adjusting the relative distance between the two, the transmitting transducer and the receiving transducer will not rotate relative to each other, that is, the two can always be in the same vertical plane, ensuring the accuracy of the relative position of the transmitting transducer and the receiving transducer, and the sound waves emitted by the transmitting transducer can be accurately received by the receiving transducer, thereby improving the accuracy and precision of the measurement results. At the same time, when using the legs 200 to adjust the distance between the transmitting transducer and the receiving transducer, the operator can intuitively obtain the position of the legs 200 relative to the base 100 through the scale line 101, so as to know the sliding distance of the legs 200, reduce the difficulty of operation, improve the adjustment efficiency, and reduce the detection cost.
[0048] The following embodiments illustrate the details of the fixing device provided in the present application by way of examples.
[0049] In this embodiment, optionally, two groups of scale lines 101 are provided, and the two groups of scale lines 101 are arranged in the extension direction of the preset axis. The two feet 200 are respectively matched with the two groups of scale lines 101 one by one, and each group of scale lines 101 is used to indicate the position of the corresponding foot 200 relative to the base 100.
[0050] With such a design, the position of each support leg 200 is adjusted by a corresponding scale line 101. When the operator adjusts the support leg 200, the corresponding scale line 101 is used as a reference. The adjusted distance is directly obtained by reading the scale of the scale line 101, and there is no need for conversion such as subtraction or addition. The adjustment time is short, the adjustment efficiency is high, and the accuracy is high.
[0051] It should be understood that the zero scale position of the two groups of scale lines 101 can be set to be located at the same middle position of the substrate 100, that is, the substrate 100 can be a rectangular bar, the length direction of the substrate 100 is the same as the extension direction of the preset axis, and the substrate 100 has two ends in the length direction. The starting ends of the two groups of scale lines 101 coincide and are located in the middle position. From the middle of the substrate 100 to the end of the substrate 100, the scale value gradually increases, which is conducive to reading.
[0052] Please combine Figure 2 In this embodiment, optionally, the base 100 includes a bottom plate 110 and a transparent cover plate 120, the scale line 101 is arranged on a plate surface of the bottom plate 110, and the transparent cover plate 120 is fixed to the bottom plate 110 and covers the scale line 101; the support leg 200 is slidably matched with the bottom plate 110 and the transparent cover plate 120. Both the bottom plate 110 and the transparent cover plate 120 can be rectangular structures, and the two can be fixed together by bonding or other methods to improve the firmness of the combination of the two.
[0053] It should be understood that the base 100 is set as a split structure, and the scale line 101 is shielded by the transparent cover 120. The scale line 101 is set as a hidden structure. When the support foot 200 slides relative to the base 100, the support foot 200 will not wear the scale line 101. The scale line 101 has a long service life and is not easy to be damaged, which reduces the cost of use. In addition, since the scale line 101 is not easy to be worn and damaged, it is easy to indicate the position of the support foot 200, which is conducive to directly reading data and improving the accuracy of position adjustment.
[0054] In this embodiment, optionally, a sliding hole 201 is provided on the support leg 200, and the sliding hole 201 is sleeved outside the base 100, and the sliding hole 201 and the base 100 are slidably matched in the extension direction of the preset axis. The support leg 200 is sleeved outside the base 100 by using the sliding hole 201, which is convenient for installation.
[0055] In this embodiment, optionally, the cross-sectional profile of the sliding hole 201 is non-circular, and the cross-sectional profile of the base 100 corresponds to the sliding hole 201, so that the support leg 200 and the base 100 are relatively fixed in the circumferential direction of the preset axis. For example, in this embodiment, the sliding hole 201 is a rectangular hole, and the cross-sectional profile of the base 100 is a rectangle. After the support leg 200 is sleeved on the outside of the base 100 using the sliding hole 201, the support leg 200 can slide relative to the base 100, but the support leg 200 will not rotate relative to the base 100, and the position is stable and reliable.
[0056] That is to say, the support foot 200 and the base 100 can slide in the extension direction of the preset axis, and the support foot 200 will not rotate relative to the base 100. In this way, when the support foot 200 is used to adjust the relative position of the transmitting transducer and the receiving transducer, the transmitting transducer and the receiving transducer will not rotate relative to each other, the relative position of the two is accurate, the transmitting and receiving functions of the two will not be affected, and there is no need to adjust the circumferential position of the transmitting transducer and the receiving transducer multiple times, which shortens the adjustment time and improves the working efficiency.
[0057] Furthermore, the support leg 200 is provided with an observation hole 202 connected to the sliding hole 201. When the support leg 200 slides relative to the base 100, part of the scale line 101 can be exposed in the observation hole 202; the support leg 200 is provided with an identification line 210, one end of the identification line 210 extends to the edge of the hole wall of the observation hole 202, and the identification line 210 is used to align with the scale line 101.
[0058] With such a design, the identification line 210 is exposed in the observation hole 202 , which facilitates obtaining the position of the support foot 200 relative to the base 100 through the cooperation between the identification line 210 and the scale line 101 .
[0059] In this embodiment, optionally, a locking screw 220 is provided on the support foot 200, and the sliding hole 201 is provided with a notch with an adjustable spacing. The locking screw 220 passes through the notch. The locking screw 220 is used to rotate relative to the support foot 200 to increase or decrease the spacing of the notch, thereby adjusting the tightness of the sliding hole 201 and the base 100.
[0060] With such a design, when it is necessary to adjust the position of the support foot 200 relative to the base 100, the locking screw 220 is loosened, the friction between the support foot 200 and the base 100 is small, and the sliding adjustment position of the support foot 200 is more flexible and convenient. When the position adjustment of the support foot 200 relative to the base 100 is completed, the relative position of the transmitting transducer and the receiving transducer is determined, and then the locking screw 220 is used to lock the support foot 200 on the base 100, thereby ensuring the stability of the positions of the transmitting transducer and the receiving transducer during the detection process and improving the accuracy of the detection results.
[0061] Please combine Figure 1 and Figure 4 In this embodiment, optionally, the positioning mechanism 300 includes two claws 310 arranged in pairs, and the two claws 310 are fixedly connected to the support leg 200, and the two claws 310 cooperate to form a clamping space 320. The two claws 310 have a certain deformation ability. When the transducer is clamped into the claws 310, the transducer can first open the two claws 310. When the transducer is clamped into the clamping space 320, the two claws 310 restore the deformation and hold the transducer tightly, so that the transducer can be easily disassembled and assembled.
[0062] It should be understood that in some embodiments, there are multiple positioning mechanisms 300 on each support leg 200, and the multiple positioning mechanisms 300 are arranged at intervals in a direction perpendicular to the preset axis, and the multiple positioning mechanisms 300 are used together to position the transmitting transducer or the receiving transducer.
[0063] For example, in this embodiment, each support leg 200 is provided with two positioning mechanisms 300 arranged vertically.
[0064] With such a design, by cooperating with a plurality of positioning mechanisms 300 to lock the transmitting transducer or the receiving transducer, the combination firmness of the transmitting transducer and the receiving transducer with the support leg 200 can be improved, thereby reducing assembly errors and improving the accuracy of the detection results.
[0065] In this embodiment, optionally, a level 400 is installed on the base 100; the support leg 200 includes a vertically arranged upright pole 230 and a base 240, the upright pole 230 is slidably matched with the base 100, and a plurality of adjustment studs for adjusting the horizontality are arranged at the bottom of the base 240. It should be understood that the upright pole 230 and the base 240 can be in an inverted T shape, which has high stability. The number of the adjustment studs located on the base 240 can be four.
[0066] In this design, by setting the level 400, it is possible to obtain whether the base 240 is horizontal, so as to know whether the two vertical poles 230 are vertically extended, thereby ensuring the horizontality of the transmitting transducer and the receiving transducer and improving the measurement accuracy. Before the test, by screwing the adjustment stud and cooperating with the level 400, the horizontality of the base 100 can be improved, thereby improving the verticality of the vertical pole 230.
[0067] It should be understood that the level 400 can be set in the middle position of the base 100 without affecting the sliding of the legs 200, that is, when the distance between the two legs 200 is adjusted during the detection process, it will not contact the base 100 even when the distance between the two legs 200 is the smallest.
[0068] In the fixing device provided in this embodiment, the transmitting transducer and the receiving transducer are respectively fixed on two supporting legs 200, and the two supporting legs 200 are guided to slide by the base 100, so as to adjust the distance between the transmitting transducer and the receiving transducer. The adjustment is convenient, and after the adjustment, the relative position of the transmitting transducer and the receiving transducer is accurate, and the detection result is highly accurate.
[0069] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.
Claims
1. A fixing device for positioning a delay time calibration transducer assembly of an ultrasonic detector system, wherein the transducer assembly comprises a paired transmitting transducer and a receiving transducer, characterized in that: include: A base (100) and two legs (200), wherein the base (100) is provided with scale lines (101) arranged in the extension direction of a preset axis; the two legs (200) are both mounted on the base (100), and each of the legs (200) is slidably matched with the base (100) in the extension direction of the preset axis; each of the legs (200) is provided with a positioning mechanism (300), and the positioning mechanisms (300) on the two legs (200) are respectively used to position a transmitting transducer and a receiving transducer.
2. The fixing device according to claim 1, characterized in that: Two groups of scale lines (101) are provided, and the two groups of scale lines (101) are arranged in the extension direction of the preset axis. The two supporting feet (200) are respectively matched with the two groups of scale lines (101) one by one, and each group of scale lines (101) is used to indicate the position of the corresponding supporting foot (200) relative to the base (100).
3. The fixing device according to claim 1, characterized in that: The base (100) comprises a bottom plate (110) and a transparent cover plate (120); the scale line (101) is arranged on a plate surface of the bottom plate (110); the transparent cover plate (120) is fixed to the bottom plate (110) and covers the scale line (101); and the support foot (200) is slidably matched with the bottom plate (110) and the transparent cover plate (120) at the same time.
4. The fixing device according to claim 1, characterized in that: The support leg (200) is provided with a sliding hole (201), the sliding hole (201) is sleeved on the outside of the base body (100), and the sliding hole (201) and the base body (100) are slidably matched in the extension direction of the preset axis.
5. The fixing device according to claim 4, characterized in that: The cross-sectional profile of the sliding hole (201) is non-circular, and the cross-sectional profile of the base (100) corresponds to that of the sliding hole (201), so that the support leg (200) and the base (100) are relatively fixed in the circumferential direction of the preset axis.
6. The fixing device according to claim 4, characterized in that: The support leg (200) is provided with an observation hole (202) connected to the sliding hole (201); when the support leg (200) slides relative to the base (100), part of the scale line (101) can be exposed in the observation hole (202); the support leg (200) is provided with a marking line (210), one end of the marking line (210) extends to the edge of the hole wall of the observation hole (202), and the marking line (210) is used to align with the scale line (101).
7. The fixing device according to claim 4, characterized in that: The support leg (200) is provided with a locking screw (220), the sliding hole (201) is provided with a notch with an adjustable spacing, the locking screw (220) passes through the notch, and the locking screw (220) is used to rotate relative to the support leg (200) to increase or decrease the spacing of the notch, thereby adjusting the tightness of the sliding hole (201) and the base (100).
8. The fixing device according to claim 1, characterized in that: The positioning mechanism (300) comprises two claws (310) arranged in pairs, the two claws (310) are both fixedly connected to the supporting foot (200), and the two claws (310) cooperate to form a clamping space (320).
9. The fixing device according to claim 8, characterized in that: There are multiple positioning mechanisms (300) on each of the supporting legs (200), and the multiple positioning mechanisms (300) are arranged at intervals in a direction perpendicular to the preset axis. The multiple positioning mechanisms (300) are used in conjunction to position a transmitting transducer or a receiving transducer.
10. The fixing device according to claim 1, characterized in that: A level (400) is installed on the base (100); the support leg (200) comprises a vertically arranged upright pole (230) and a base (240); the upright pole (230) is slidably matched with the base (100); and a plurality of adjustment studs for adjusting the horizontality are arranged at the bottom of the base (240).