Surface depression measuring device

Abstract

The invention discloses a surface depression measuring device which comprises a frame and a marking mechanism, fixing devices are arranged on backup plates on two sides of the frame to be adsorbed and fixed on the surface of a to-be-measured workpiece to establish a reference, a sliding block with a floating rod is slidably arranged in a T-shaped groove in the top of the frame, the lower end of the floating rod is in contact with the surface of the workpiece, and a marking pen is arranged at the upper end of the floating rod. During measurement, the sliding block drives the floating rod to slide along the T-shaped groove, the floating rod floats up and down along with fluctuation of the surface depression, the marking pen is driven to synchronously draw tracks on the rear vertical scale plate, and the depression depth is directly read through the vertical difference value of the tracks. Rapid positioning, continuous scanning and real-time marking are achieved through an integrated structure, the problems that a traditional tool is tedious in operation and low in efficiency, and high-precision scanning equipment is high in cost and not suitable for field application are effectively solved, and the device has the advantages of being accurate in measurement, convenient and fast to operate and wide in applicability.

Description

Technical Field

[0001] This invention relates to the field of manufacturing auxiliary tooling technology, and more specifically to a surface concavity measuring device. Background Technology

[0002] In the manufacturing of large steel structures such as shipbuilding, heavy machinery, and bridge construction, the surface quality of products is one of the important indicators for measuring their technological level and appearance quality. During the rolling, transportation, welding, or forming processes, steel plates often develop plastic deformation defects such as localized dents and indentations due to external forces or improper processes. While these surface dents may not immediately affect the macroscopic mechanical properties of the structure, they significantly impair the smoothness of the product's appearance and can lead to problems such as shadows and paint buildup in subsequent sandblasting and painting processes, severely impacting the final product's aesthetics and the lifespan of the anti-corrosion coating. Therefore, rapid and accurate measurement and assessment of the depth and extent of surface dents on steel plates during the manufacturing and acceptance stages is an indispensable part of quality control.

[0003] Currently, the industry still largely relies on traditional hand tools or general measuring instruments for measuring surface depressions. Common methods include using a straightedge and feeler gauge for localized gap measurements, or using contact instruments such as depth micrometers and dial indicators for point-to-point inspection. While these methods can quantify depression depth to some extent, they generally suffer from limitations such as cumbersome operation, inaccurate positioning, and unstable readings. Furthermore, using a straightedge and feeler gauge requires multiple people working together and is highly dependent on the operator's experience; while depth micrometers, although relatively accurate, are unsuitable for continuous measurements on surfaces with large curvatures or complex shapes, and cannot perform rapid marking and data recording simultaneously.

[0004] With the development of digital inspection technology, non-contact measurement equipment such as 3D laser scanning and optical profilometers have emerged in recent years, enabling high-precision reconstruction and data analysis of surface morphology. However, these devices are usually expensive, have high environmental requirements, require specialized operation, and have long data processing cycles, making it difficult to achieve rapid and flexible widespread application in workshops, high-altitude operations, or on large components. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a surface depression measuring device that can be quickly installed, stably attached to the surface of a steel plate, and realize continuous sliding measurement and real-time marking.

[0006] To achieve the above objectives, the technical solution provided by the present invention is as follows.

[0007] A surface depression measuring device, comprising: The frame has a T-shaped groove on its top surface and a hollowed-out section in the middle of the T-shaped groove on its bottom surface; the frame has backing plates on its left and right sides, a scale plate on its rear side, a locking groove on its front side, and a fixing device on the backing plates. The marking mechanism includes a slider that is slidably disposed in the T-slot, the slider having a through hole vertically, a floating rod that is levitated through the through hole laterally, and a locking device that is levitated through the locking groove laterally; a marking pen is disposed at the upper end of the floating rod. The fixing device allows the workpiece to be tested to be detachably fixed between the two backing plates, the lower end of the floating rod abuts against the workpiece to be tested, the locking device allows the slider and the frame to switch between fixed and sliding states, and the marking pen marks on the scale plate.

[0008] As a preferred technical solution, the fixing device includes a magnetic adsorption device disposed at the bottom of the backing plate. The magnetic adsorption device is a magnetic base with a built-in permanent magnet and is equipped with a knob switch. By rotating the knob switch, the internal magnetic circuit is changed, thereby realizing the on and off of the magnetic force.

[0009] As a preferred technical solution, a non-magnetic pad is provided between the bottom of the backing plate and the magnetic adsorption device.

[0010] As a preferred technical solution, the fixing device is a vacuum plastic suction cup; the vacuum plastic suction cup is fixed to the bottom of the backing plate by a mounting base, and it adsorbs onto the surface of the workpiece to be tested by generating negative pressure.

[0011] As a preferred technical solution, the slider is configured as a trapezoidal block that mates with the T-slot.

[0012] As a preferred technical solution, the locking device includes a locking bolt, which passes through the locking groove on the front side of the frame and is screwed into the threaded hole on the side of the slider. Tightening the locking bolt can press and fix the slider on the frame.

[0013] As a preferred technical solution, the floating rod is a cylindrical structure with a tapered lower end, and its tapered head is used to contact the surface of the workpiece to be measured.

[0014] As a preferred technical solution, the upper end of the floating rod is provided with a light hole and a threaded hole communicating with the light hole. The marking pen passes through the light hole and is fixed by screwing a locking bolt into the threaded hole.

[0015] As a preferred technical solution, the scale plate is a long strip-shaped plate structure with scale lines arranged horizontally on its surface. The scale lines are distributed in a mirror image along the horizontal center. A slot matching the shape of the scale plate is provided on the rear side of the frame, and the scale plate is detachably connected to the slot.

[0016] As a preferred technical solution, the frame is provided with pin holes for setting stop pins, and the stop pins are installed at both ends of the T-slot to limit the stroke of the slider.

[0017] The advantages and beneficial effects of this invention are that it integrates three major functions: fixed measurement reference, continuous sliding scanning, and real-time marking and recording. The device can be quickly and securely installed on the surface of the workpiece to be measured via fixing devices on the side plates of the frame, establishing a stable and reliable measurement reference plane. Subsequently, the operator can loosen the locking device, allowing the slider to drive the floating rod to slide freely along the T-slot of the frame. When the conical head at the lower end of the floating rod slides across the workpiece surface, it floats up and down with the undulations of the depressions. This vertical displacement is synchronously transmitted to the marking pen at the upper end through the floating rod, thus marking the corresponding trajectory on the vertically mounted scale plate behind. The measurer only needs to observe the marking pen on the scale plate to read or calculate the depression situation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the surface depression measuring device of the present invention.

[0019] Figure 2 This is a schematic diagram of the fixing device structure shown in the present invention.

[0020] Figure 3 This is a schematic diagram of the frame structure shown in the present invention.

[0021] Figure 4 This is a schematic diagram of the scale plate structure shown in this invention.

[0022] Figure 5 This is a schematic diagram of the floating rod structure shown in this invention.

[0023] Figure 6 This is a schematic diagram of the slider structure shown in this invention.

[0024] Figure label: 1-Frame, 2-T-slot, 3-Backplate, 4-Scale plate, 5-Locking groove, 6-Slider, 7-Through hole, 8-Floating rod, 9-Marker pen, 10-Fixing device, 11-Knob switch, 12-Locking bolt, 13-Threaded hole, 14-Smooth hole, 15-Scale line, 16-Slot, 17-Stop pin. Detailed Implementation

[0025] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not the entire structure. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0026] The terms “comprising” and “having”, and any variations thereof, used in this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0027] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly or implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0028] Please see Figures 1 to 6 This invention provides a surface concavity measuring device, comprising a frame 1 with a T-slot 2 on its top surface and a hollowed-out section in the middle of the T-slot 2 on its bottom surface; support plates 3 are respectively provided on the left and right sides of the frame 1, a scale plate 4 is provided on the rear side, and a locking groove 5 is provided on the front side; a fixing device 10 is provided on the support plates 3. The frame 1 serves as the base of the entire device, and its T-slot 2 provides precise guidance for subsequent sliding scanning, while the hollowed-out structure at the bottom provides necessary space for the up-and-down movement of the floating rod 8, avoiding interference.

[0029] The two side plates 3 are not only used to install the fixing device 10, but their inner surfaces also together form a reference surface for measurement after installation, ensuring that the measurement results reflect the depth of the depression relative to the surrounding normal plane, rather than the absolute height.

[0030] Specifically, this device can be widely used on components with large flat or gently curved surfaces, such as ship decks, bulkheads, large tank walls, and bridge steel structures. Before measurement, the operator needs to stably attach the frame 1 to the area to be measured on the surface of the workpiece using the fixing device 10, ensuring that the bottom surface of the frame 1 is in good contact with the workpiece surface and that the inner surfaces of both backing plates 3 are in contact with the workpiece, thereby establishing a local reference plane. Traditional measurement methods, such as using a straightedge, require multiple people to cooperate and the reference is difficult to unify. This device achieves rapid and automatic establishment of the reference through its own structure, which is the key to its high efficiency.

[0031] To achieve continuous scanning and real-time marking of the depth of depressions on the surface to be measured, one embodiment provides a technical solution including a marking mechanism. This mechanism comprises a slider 6 slidably disposed in a T-slot 2. The slider 6 has a vertically arranged through-hole 7, and a floating rod 8 is buoyantly connected within the through-hole 7. The slider 6 is laterally connected to a locking device via a locking groove 5. A marking pen 9 is attached to the upper end of the floating rod 8. A fixing device 10 is used to detachably fix the workpiece to be measured between two backing plates 3. The lower end of the floating rod 8 is used to contact the surface of the workpiece. The locking device is used to switch the slider 6 and the frame 1 between a fixed and a sliding state. The marking pen 9 is used to mark on a scale plate 4. The precise fit between the slider 6 and the T-slot 2 ensures the straightness of the scanning trajectory. The floating rod 8 can float freely up and down within the through-hole 7, and its lower conical head always remains in contact with the workpiece surface under its own weight.

[0032] Specifically, during operation, the locking device is first released, and the operator manually pushes the slider 6 or directly pushes the floating rod 8, causing the entire marking mechanism to slide from one end to the other along the T-slot 2. When the lower end of the floating rod 8 passes through the recessed area, it automatically rises or falls according to the depth of the recess, and this vertical displacement is transmitted to the marking pen 9 at the upper end without loss. The marking pen 9 then draws the corresponding trajectory on the vertically mounted scale plate 4. After one scanning stroke, the lowest point of the trajectory (corresponding to the deepest point of the recess) is observed, and the corresponding scale value on the scale plate 4 is the depth of the recess. This transforms the difficult-to-observe two-dimensional planar defect into a one-dimensional height difference that is clearly visible on the scale plate, which is very intuitive and effectively avoids the errors that may be caused by repeated point measurements, manual readings, and recording.

[0033] To provide a powerful and convenient fixing method suitable for steel workpieces, one embodiment provides a technical solution including a magnetic adsorption device 10 disposed at the bottom of the backing plate 3. This magnetic adsorption device is a magnetic base with a built-in permanent magnet and equipped with a rotary switch 11. Rotating the rotary switch 11 changes the internal magnetic circuit, thereby switching the magnetic force on and off. The magnetic base uses high-performance permanent magnets such as neodymium iron boron. Through a sophisticated magnetic circuit design, it generates a strong adsorption force in the adsorption state, ensuring that the device will not slip on rough or even slightly oily steel plate surfaces. In the off state, the magnetic force is shielded internally, allowing the device to be easily removed. The design of the rotary switch 11 allows fixing and releasing operations to be completed simply by rotating it by hand, without any additional tools, greatly improving work efficiency.

[0034] Furthermore, the electromagnet or the connection circuit of the electromagnet is prior art, and will not be described in detail here.

[0035] To optimize the transmission efficiency of the magnetic field and prevent the frame itself from causing unnecessary shunting or weakening of the magnetic force, one embodiment provides a technical solution including a non-magnetic pad between the bottom of the backing plate 3 and the magnetic adsorption device. This pad is typically made of non-ferromagnetic materials such as copper, aluminum, or stainless steel. Its presence forces the magnetic field lines to be difficult to pass through the pad, instead concentrating on the steel workpiece below to form a closed magnetic circuit, thereby enhancing the effective adsorption force. Without this pad, some of the magnetic field would short-circuit through the magnetically conductive frame 1 itself or be used to magnetize the frame structure, resulting in a decrease in the adsorption force.

[0036] To expand the applicability of this device and enable it to measure non-ferromagnetic workpieces such as aluminum alloys, composite materials, and fiberglass, one embodiment provides a technical solution including a vacuum plastic suction cup as the fixing device 10; the vacuum plastic suction cup is fixed to the bottom of the backing plate 3 via a mounting base. In use, the suction cup is pressed against the smooth surface of the workpiece, squeezing out the internal air, and atmospheric pressure is used to generate adsorption force.

[0037] To ensure that the slider 6 slides smoothly, stably, and without wobbling in the T-slot 2, and to prevent it from dislodging from the slot, one embodiment provides a technical solution in which the slider 6 is constructed as a trapezoidal block that mates with the T-slot 2. The trapezoidal sliding guide has the advantages of automatic centering, high guiding accuracy, and strong resistance to overturning moments. The mating surfaces are typically precision-machined and coated with an appropriate amount of grease to ensure smooth sliding. Compared to a simple rectangular fit, the trapezoidal structure effectively prevents the slider 6 from tilting or jamming due to force during movement, ensuring the stability and repeatability of the measurement process.

[0038] To enable the marking mechanism to be locked in any position during scanning for reading or marking specific points, one embodiment provides a locking device including a locking bolt 12. This bolt passes through a locking groove 5 on the front side of the frame 1 and screws into a threaded hole 13 on the side of the slider 6. Tightening the locking bolt 12 secures the slider 6 to the frame 1. The locking groove 5 is an elongated hole, providing space for the movement of the locking bolt 12. When the locking bolt 12 is tightened, its head presses against the front wall of the frame 1, and the resulting reaction force presses the slider 6 against the inner wall of the T-slot 2, achieving reliable locking. This single-bolt locking structure is simple, reliable, and easy to operate.

[0039] To ensure that the lower end of the floating rod 8 maintains point contact with the workpiece surface, reducing the impact of the contact area on measurement accuracy and adapting to slight surface unevenness, one embodiment provides a technical solution in which the floating rod 8 is a cylindrical structure with a tapered lower end, its tapered head used to contact the surface of the workpiece to be measured. The tapered head design makes it a sensitive probe, capable of detecting even minute indentations and undulations. Simultaneously, the sharp head helps reduce frictional resistance with the workpiece surface, making the up-and-down movement of the floating rod 8 more sensitive. Considering potential wear from long-term use, the tapered head can be made of wear-resistant hard alloy material or designed to be replaceable.

[0040] In some embodiments, the conical head and the workpiece's reference point are configured to form a hemispherical surface, thereby reducing unwanted scratches.

[0041] To reliably install the marker pen 9 and allow for replacement with pens of different colors or types as needed, one embodiment provides a technical solution including a radially provided aperture 14 and a threaded hole communicating with the aperture 14 on the upper sidewall of the floating rod 8. The marker pen 9 passes through the aperture 14 and is secured by a locking bolt screwed into the threaded hole. The aperture 14 is used for radial positioning of the marker pen 9, while the lateral locking bolt clamps it by pressing against the pen shaft. This design allows the use of standard-sized marker pens, reducing operating costs. During installation, it should be ensured that the tip of the marker pen 9 can easily and stably contact the surface of the scale plate 4.

[0042] In some embodiments, the marker pen 9 can be prepared in multiple colors, such as a first-color pen and a second-color pen. Before starting the formal measurement, the operator first installs the first-color marker pen on the floating rod 8. Then, the measuring device is placed on a known flat area on the workpiece surface or in an area that serves as a theoretical reference. Without loosening the locking device, the entire slider 6 and floating rod 8 assembly is manually and slightly adjusted up and down so that the tip of the first-color pen is precisely aligned with the zero mark on the scale plate 4. Then, the slider 6 is pushed along the T-slot 2 to complete its full stroke, at which point the first-color pen will draw a reference line on the scale plate 4.

[0043] This line represents the projection of an ideal, non-recessed plane or curved surface onto the scale plate. Next, the operator changes to a second-colored marker and moves the measuring device to the area of ​​the workpiece to be inspected. While keeping the device stationary, the locking device is released, and normal scanning measurement is performed. At this point, the second-colored marker will draw the actual contour line on scale plate 4, following the actual undulations of the workpiece surface. The operator does not need to memorize abstract scale values; instead, through intuitive visual comparison, they can directly observe the degree of deviation of the second-colored contour line from the first-colored reference line. Any depression will appear as an upward offset of the second-colored line from the first-colored line, and any convexity will appear as a downward offset.

[0044] To facilitate intuitive reading of measurement results and convenient maintenance and replacement of the scale plate, one embodiment provides a technical solution including a scale plate 4 that is a long strip-shaped structure with horizontally arranged scale lines 15 on its surface. A slot 16 matching the shape of the scale plate 4 is provided on the rear side of the frame 1, and the scale plate 4 is detachably connected to the slot 16. The scale plate 4 is typically made of transparent acrylic or white engineering plastic, and the scale lines 15 are produced through printing or engraving processes, ensuring clarity and durability.

[0045] Specifically, the scale lines 15 adopt an up-and-down mirror layout with the center zero position as the reference. Before use, the fixing device 10 is first adjusted so that when the initial flat part of the workpiece to be measured contacts the lower end of the floating rod 8, the initial position of the marker pen 9 is exactly aligned with the zero scale line of the scale plate 4. In this way, when a depression is scanned, the marker pen 9 moves upward to indicate a positive depth value; if a protrusion is encountered, it moves downward to indicate a negative value. This bidirectional design allows the device to not only measure depressions but also detect protrusions, making its function more comprehensive. The connection method of the slot 16 allows the scale plate 4 to be quickly replaced after contamination or damage, and also facilitates the replacement of scale plates with different graduation values ​​according to different accuracy requirements.

[0046] In some embodiments, in order to perform multiple sweeps on a certain plane of the same workpiece, the height of the scale plate on the frame is made into an adjustable structure. The adjustable structure includes, but is not limited to, a hand-cranked screw lifting device, a servo motor screw lifting device, etc. Alternatively, the scale can be set as a scroll, which is wrapped around the outer periphery of the scale plate. Rotating the scroll handle can make the scale move relative to the scale plate.

[0047] To mechanically limit the sliding stroke of the slider 6 and prevent it from falling and being damaged due to accidental slippage out of the T-slot 2, one embodiment provides a technical solution including: the frame 1 is provided with pin holes for mounting stop pins 17, which are installed at both ends of the T-slot 2 to limit the stroke of the slider 6. The stop pins 17 are standard cylindrical pins that are pressed into the pin holes of the frame 1. They constitute a physical stop for the movement of the slider 6, ensuring safe use. The installation position of the stop pins 17 can be adjusted within a certain range according to the needs of the measurement area.

[0048] To further improve measurement accuracy, especially to eliminate systematic errors, a simple calibration can be performed on the device before use. Specifically, this can be done using a high-precision gauge block (such as a feeler gauge) of known thickness. Place the gauge block on the reference plane at the bottom of frame 1, loosen the locking device, and let the lower end of the floating rod 8 rest on the upper surface of the gauge block. Observe whether the indication value of the marker pen 9 on the scale plate 4 is consistent with the thickness of the gauge block. If there is a deviation, it can be corrected by fine-tuning the depth of the scale plate 4 in the slot 16 or by recording the systematic error value and correcting it in subsequent measurements.

[0049] In some embodiments, to fundamentally prevent the floating rod 8 from rotating circumferentially during measurement, its structure has been optimized. Specifically, the cross-section of the floating rod 8 is constructed to be non-circular, such as elliptical, rectangular, near-rectangular, or D-shaped with parallel planes. Simultaneously, the through hole 7 on the slider 6 is shaped to perfectly match the cross-sectional shape of the floating rod 8.

[0050] Considering the difficulty of taking readings in environments with strong light, dim light, or poor operator visibility, this embodiment can be further optimized as follows: the marking pen 9 can be replaced by a fluorescent pen or an electronic digital dial indicator instead of a mechanical marking pen. If a digital dial indicator is used, it can be fixed on the floating rod 8, with its probe in contact with the workpiece, and the measurement result can be directly displayed on the LCD screen, making the reading more accurate and convenient, but the cost will increase accordingly. In addition, a bubble level can be added to the frame 1 to help determine whether the device is placed horizontally during installation, ensuring the accuracy of the reference.

[0051] The working principle of this invention is as follows: First, select a suitable fixing device 10 according to the workpiece material, and firmly install the device on the surface of the workpiece to be measured, ensuring that the bottom surface of the frame 1 and the inner side of the backing plate 3 are in contact with the workpiece, thus establishing a reliable local measurement reference. Then, perform zero-point calibration: move the marking mechanism to a known flat area on the workpiece surface, loosen the locking bolt 12, and allow the lower conical end of the floating rod 8 to naturally contact the workpiece surface under the action of gravity. At this time, manually adjust the scale plate 4 or remember the initial position of the tip of the marking pen 9 and set it as the zero point.

[0052] After preparation, measurement can begin: keeping the locking device loose, push the slider 6 at a constant speed to move the floating rod 8 along the T-slot 2 across the area to be tested. The lower end of the floating rod 8 acts like a highly sensitive probe, precisely tracking the microscopic morphological undulations of the workpiece surface and transmitting this vertical displacement to the marking pen 9 at the upper end in real time. The marking pen 9 then draws an enlarged version of the surface contour on the vertical scale plate 4. After measurement, the operator only needs to read the difference between the peak value (for protrusions) or valley value (for depressions) in the trajectory and the zero mark to directly obtain the depth value of the depression or protrusion.

[0053] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A surface concavity measuring device, characterized in that, include: A frame (1) has a T-shaped groove (2) on its top surface and the bottom surface of the frame (1) is hollowed out in the middle section of the T-shaped groove (2); a backing plate (3) is provided on the left and right sides of the frame (1), a scale plate (4) is provided on the rear side, and a locking groove (5) is provided on the front side; a fixing device (10) is provided on the backing plate (3). The marking mechanism includes a slider (6) that is slidably disposed in the T-slot (2), the slider (6) having a through hole (7) vertically disposed therein, a floating rod (8) floatingly connected in the through hole (7), and a locking device disposed therein through the locking groove (5); a marking pen (9) is disposed at the upper end of the floating rod (8); The fixing device (10) is used to detachably fix the workpiece to be tested between the two back plates (3), the lower end of the floating rod (8) is used to contact the surface of the workpiece to be tested, the locking device is used to switch the slider (6) and the frame (1) between fixed and sliding states, and the marking pen (9) is used to mark on the scale plate (4).

2. The surface concavity measuring device according to claim 1, characterized in that, The fixing device (10) includes a magnetic adsorption device disposed at the bottom of the back plate (3). The magnetic adsorption device is a magnetic base with a built-in permanent magnet and equipped with a rotary switch (11). By rotating the rotary switch (11), the internal magnetic circuit is changed, thereby realizing the on and off of the magnetic force.

3. The surface concavity measuring device according to claim 2, characterized in that, A non-magnetic pad is provided between the bottom of the backing plate (3) and the magnetic adsorption device.

4. The surface concavity measuring device according to claim 1, characterized in that, The fixing device (10) is a vacuum plastic suction cup; the vacuum plastic suction cup is fixed to the bottom of the backing plate (3) by a mounting base.

5. The surface concavity measuring device according to claim 1, characterized in that, The slider (6) is configured as a trapezoidal block that mates with the T-slot (2).

6. The surface concavity measuring device according to claim 1, characterized in that, The locking device includes a locking bolt (12) which passes through the locking groove (5) on the front side of the frame (1) and is screwed into the threaded hole (13) on the side of the slider (6). Tightening the locking bolt (12) can press and fix the slider (6) onto the frame (1).

7. The surface concavity measuring device according to claim 1, characterized in that, The floating rod (8) is a cylindrical structure with a tapered lower end, and its tapered head is used to contact the surface of the workpiece to be tested.

8. The surface concavity measuring device according to claim 1, characterized in that, The upper sidewall of the floating rod (8) is provided with a light hole (14) and a threaded hole communicating with the light hole (14). The marker pen (9) passes through the light hole (14) and is screwed into the threaded hole by a locking bolt to fix the marker pen (9).

9. The surface concavity measuring device according to claim 1, characterized in that, The scale plate (4) is a long strip-shaped plate structure with scale lines (15) arranged horizontally on its surface. The frame (1) has a slot (16) on its rear side that matches the shape of the scale plate (4). The scale plate (4) and the slot (16) are detachably connected.

10. The surface concavity measuring device according to claim 1, characterized in that, The frame (1) is provided with pin holes for mounting stop pins (17), which are mounted at both ends of the T-slot (2) to limit the stroke of the slider (6).

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